Patent Publication Number: US-10788874-B2

Title: Method and electronic device for controlling power between electronic devices

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is based on and claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2017-0106946, filed on Aug. 23, 2017, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Field 
     This disclosure relates to a method and electronic device for controlling power between electronic devices for controlling power of an external electronic device connected to the electronic device. 
     2. Description of Related Art 
     Electronic devices such as smart phones, tablet PCs, or notebook PCs can be used in various fields due for convenience and portability. In recent years, there is an increasing interest in an external device, for example, an accessory device, which is functionally connectable with the electronic devices described above. In addition, the accessory device may also be connected to an auxiliary accessory device, for example, a power supply. 
     An external electronic device, may be used by being functionally connected to a mobile terminal (e.g., a smart phone) or the like. At this time, the external electronic device may be powered from the mobile terminal. In addition, the external electronic device may also be connected to an auxiliary accessory device, for example, a power supply. 
     The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regards to the present disclosure. 
     SUMMARY 
     Even if the power supply is connected to an HMD device, a problem may occur that power is not supplied to the HMD device or an external electronic device (e.g., a smart phone) connected to the HMD device when the HMD device is OFF. In order for the HMD device to be turned ON, it may be necessary for (1) the HMD device to receive power from the external electronic device connected to the HMD device; and (2) the HMD device to be booted. However, when the external electronic device is OFF, even if both the power supply and the external electronic device are connected to the HMD device, the HMD device might not be booted. Thus, it might not be possible to supply power to the HMD device or the external electronic device or to control the power of the external electronic device. 
     Various embodiments disclosed herein provide a method and electronic device for controlling power between electronic devices, in which even when an external electronic device (e.g., a smart phone) in an OFF state is connected to an electronic device (e.g., an HMD device), the electronic device may be turned ON by a power supply connected to the electronic device, and the power of the external electronic device may be controlled by the electronic device in the ON state. 
     In order to solve the problems described above or other problems, an electronic device according to various embodiments may include a first connector including at least one first pin and at least one second pin configured to be connected to an external electronic device; a second connector comprising at least one third pin and at least one fourth pin configured to be connected to a power supply; a switching circuit; and a processor electrically connected to the first connector, the second connector, and the switching circuit, wherein the processor is configured to determine a connection with the external electronic device or a connection with the power supply are connected, and the processor is set to cause, when connected to the external electronic device via the first connector and connected to the power supply via the second connector, power received from the power supply via the at least one third pin to be supplied to the at least one first pin using the switching circuit. 
     According to other embodiments, an electronic device can comprise: a first connector including at least one first pin and at least one second pin configured to be connected to an external electronic device; a second connector comprising at least one third pin and at least one fourth pin configured to be connected to a power supply; a switching circuit set to supply, when connected to the external electronic device via the first connector and connected to the power supply via the second connector, power received from the power supply via the at least one third pin to the at least one first pin; and a processor set to transmit, when it is confirmed that the power of the external electronic device is in an OFF state using the first connector, information related to control of power of the external electronic device via the at least one second pin of the first connector. 
     According to another embodiment, a method of controlling power between electronic devices, comprises: determining a connection with an external electronic device via at a first connector comprising at least one first pin and at least one second pin; determining a connection with a power supply via a second connector comprising at least one third pin and at least one fourth pin; receiving power from the power supply via the at least one third pin; and supplying the power, which is received from the power supply via the at least one third pin, to the at least one first pin when it is determined that an electronic device is connected to the external electronic device via the first connector and is connected to the power supply via the second connector. 
     With a method and an electronic device for controlling power between electronic devices according to various embodiments, even when an external electronic device (e.g., a smart phone) connected to an electronic device (e.g., an HMD device) is in an OFF state, the electronic device can be in the ON state by a power supply connected to the electronic device so that power can be supplied to the external electronic device. 
     With a method and an electronic device for controlling power between electronic devices according to various embodiments, even when an external electronic device (e.g., a smart phone) connected to an electronic device (e.g., an HMD device) is in an OFF state, the electronic device can be in the ON state by a power supply connected to the electronic device so that power of the external electronic device can be controlled. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features, and advantages of the present disclosure will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a view illustrating a network environment in which power is controlled between electronic devices according to various embodiments; 
         FIG. 2  is a perspective view illustrating an external electronic device according to various embodiments; 
         FIG. 3  is a perspective view illustrating a structure of an electronic device comprising a HMD device according to various embodiments; 
         FIG. 4  is a view illustrating an example in which an external electronic device is mounted on the HMD device according to various embodiments; 
         FIG. 5  is a view illustrating an example in which an external electronic device is mounted on the HMD device according to various embodiments; 
         FIG. 6  is a view illustrating an example in which a user wears the HMD device on which an external electronic device is mounted according to various embodiments; 
         FIG. 7  is a view illustrating a screen mode of an external electronic device according to various embodiments; 
         FIG. 8  is a block diagram illustrating a schematic structure of a system according to various embodiments; 
         FIG. 9  is a diagram illustrating a detailed structure of the system according to various embodiments; 
         FIG. 10  is a diagram illustrating a detailed structure of the system according to various embodiments; 
         FIG. 11  is a diagram illustrating a detailed structure of the system according to various embodiments; 
         FIG. 12  is a diagram illustrating a detailed structure of the system according to various embodiments; 
         FIG. 13  is a flowchart illustrating a power control procedure between electronic devices according to various embodiments; 
         FIG. 14  is a flowchart illustrating a power control procedure between electronic devices according to various embodiments; 
         FIG. 15  is a signal flowchart illustrating a power control procedure between electronic devices according to various embodiments; 
         FIG. 16  is a perspective view illustrating a detailed structure of a connector according to various embodiments; 
         FIG. 17  is a view illustrating a detailed structure of respective pins that constitute the connector according to various embodiments; 
         FIG. 18  is a view illustrating a detailed structure of respective pins that constitute the connector according to various embodiments; 
         FIG. 19  is a block diagram illustrating an exemplary configuration of the HMD device according to various embodiments; 
         FIG. 20  is a block diagram illustrating a program module according to various embodiments; and 
         FIG. 21  is a flowchart illustrating a procedure of power of an external electronic device from an electronic device according to various embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, various embodiments will be described with reference to the accompanying drawings. The embodiments and the terms used therein are not intended to limit the technology disclosed herein to specific forms, and should be understood to include various modifications, equivalents, and/or alternatives to the corresponding embodiments. In describing the drawings, similar reference numerals may be used to designate similar constituent elements. A singular expression may include a plural expression unless they are definitely different in a context. As used herein, singular forms may include plural forms as well unless the context clearly indicates otherwise. The expression “a first”, “a second”, “the first”, or “the second” used in various embodiments may modify various components regardless of the order and/or the importance but does not limit the corresponding components. When an element (e.g., first element) is referred to as being “(functionally or communicatively) connected,” or “directly coupled” to another element (second element), the element may be connected directly to the another element or connected to the another element through yet another element (e.g., third element). The expression “a plurality of” may indicate “at least two”. 
     The expression “configured to” as used in various embodiments may be interchangeably used with, for example, “suitable for”, “having the capacity to”, “designed to”, “adapted to”, “made to”, or “capable of” in terms of hardware or software, according to circumstances. Alternatively, in some situations, the expression “device configured to” may mean that the device, together with other devices or components, “is able to”. For example, the phrase “processor adapted (or configured) to perform A, B, and C” may mean a dedicated processor (e.g., embedded processor) only for performing the corresponding operations or a generic-purpose processor (e.g., Central Processing Unit (CPU) or Application Processor (AP)) that can perform the corresponding operations by executing one or more software programs stored in a memory device. 
     An electronic device according to various embodiments may include at least one of, for example, a smart phone, a tablet Personal Computer (PC), a mobile phone, a video phone, an electronic book reader (e-book reader), a desktop PC, a laptop PC, a netbook computer, a workstation, a server, a Personal Digital Assistant (PDA), a Portable Multimedia Player (PMP), a MPEG-1 audio layer-3 (MP3) player, a mobile medical device, a camera, and a wearable device. The Head-Mounted Device (HMD) may include at least one of an accessory type (e.g., a watch, a ring, a bracelet, an anklet, a necklace, a glasses, a contact lens, or a Head-Mounted Device (HMD)), a fabric or clothing integrated type (e.g., an electronic clothing), a body-mounted type (e.g., a skin pad, or tattoo), and a bio-implantable type (e.g., an implantable circuit). In some embodiments, the electronic device may include at least one of, for example, a television, a Digital Video Disk (DVD) player, an audio, a refrigerator, an air conditioner, a vacuum cleaner, an oven, a microwave oven, a washing machine, an air cleaner, a set-top box, a home automation control panel, a security control panel, a TV box (e.g., Samsung HomeSync™, Apple TV™, or Google TV™), a game console (e.g., Xbox™ and PlayStation™), an electronic dictionary, an electronic key, a camcorder, and an electronic photo frame. 
     In other embodiments, the electronic device may include at least one of various medical devices (e.g., various portable medical measuring devices (a blood glucose monitoring device, a heart rate monitoring device, a blood pressure measuring device, a body temperature measuring device, etc.), a Magnetic Resonance Angiography (MRA), a Magnetic Resonance Imaging (MRI), a Computed Tomography (CT) machine, and an ultrasonic machine), a navigation device, a Global Positioning System (GPS) receiver, an Event Data Recorder (EDR), a Flight Data Recorder (FDR), a Vehicle Infotainment Devices, an electronic devices for a ship (e.g., a navigation device for a ship, and a gyro-compass), avionics, security devices, an automotive head unit, a robot for home or industry, an Automatic Teller&#39;s Machine (ATM) in banks, Point Of Sales (POS) in a shop, or internet device of things (e.g., a light bulb, various sensors, electric or gas meter, a sprinkler device, a fire alarm, a thermostat, a streetlamp, a toaster, a sporting goods, a hot water tank, a heater, a boiler, etc.). According to some embodiments, an electronic device may include at least one of a part of furniture or a building/structure, an electronic board, an electronic signature receiving device, a projector, and various types of measuring instruments (e.g., a water meter, an electric meter, a gas meter, a radio wave meter, and the like). In various embodiments, the electronic device may be flexible, or may be a combination of one or more of the aforementioned various devices. The electronic device according to one embodiment is not limited to the above described devices. In the present disclosure, the term “user” may indicate a person using an electronic device or a device (e.g., an artificial intelligence electronic device) using an electronic device. 
       FIG. 1  is a block diagram of an electronic device  101  in a network environment  100 , in which power is controlled between electronic devices, according to various embodiments. Referring to  FIG. 1 , the electronic device  101  in the network environment  100  may communicate with an electronic device  102  via a first network  198  (e.g., short-range wireless communication), or may communicate with an electronic device  104  or a server  108  via a second network  199  (e.g., long-range wireless communication). According to one embodiment, the electronic device  101  may communicate with the electronic device  104  via the server  108 . According to one embodiment, the electronic device  101  may include a processor  120 , a memory  130 , an input device  150 , a sound output device  155 , a display device  160 , an audio module  170 , a sensor module  176 , an interface  177 , a haptic module  179 , a camera module  180 , a power management module  188 , a battery  189 , a communication module  190 , a subscriber identification module  196 , and an antenna module  197 . In some embodiments, at least one of the above-mentioned components may be omitted from the electronic device  101  or other components may be added to the electronic device  101 . In some embodiments, some components may be implemented in an integrated form like, for example, the sensor module  176  (e.g., a fingerprint sensor, an iris sensor, or an illuminance sensor), which is embedded in, for example, the display device  160  (e.g., a display). 
     In certain embodiments, the power management module  188  can include a power management circuit. The power management module  188  can drive the electronic device  100  by applying received power to the processor  120  as will be describe below. 
     The processor  120  may control one or more other components (e.g., a hardware or software component) of the electronic device  101 , which are connected to the processor  120 , and may perform various data processing and arithmetic operations by driving, for example, software (e.g., a program  140 ). The processor  120  may load commands or data, which are received from other components (e.g., the sensor module  176  or the communication module  190 ), into a volatile memory  132  so as to process the commands or data, and may store resulting data into a non-volatile memory  134 . According to one embodiment, the processor  120  may include a main processor  121  (e.g., a central processing unit or an application processor), and an auxiliary processor  123 , which operates independently from the main processor  121 , additionally or alternatively uses a lower power than the main processor  121 , or includes an auxiliary processor  123  specialized for a designated function (e.g., a graphic processor device, an image signal processor, a sensor hub processor, or a communication processor). Here, the auxiliary processor  123  may be operated separately from the main processor  121  or in the manner of being embedded with the main processor  121 . 
     In this case, the auxiliary processor  123  may control at least some functions or states associated with at least one of the components of the electronic device  101  (e.g., the display device  160 , the sensor module  176 , or the communication module  190 ), on behalf of the main processor  121 , for example, while the main processor  121  is in an inactive (e.g., sleep) state, or together with the main processor  121  while the main processor  121  is in an active (e.g., application execution) state. According to one embodiment, the auxiliary processor  123  (e.g., an image signal processor or a communication processor) may be implemented as some of other functionally related components (e.g., camera module  180  or communication module  190 ). The memory  130  may store various data used by at least one component (e.g., the processor  120  or the sensor module  176 ) of electronic device  101 , for example, software (e.g., the program  140 ), and input or output data for commands which are associated with the software. The memory  130  may include, for example, a volatile memory  132  or a non-volatile memory  134 . 
     The program  140  may be software stored in the memory  130  and may include, for example, an operating system  142 , middleware  144 , or application  146 . 
     The input device  150  is a device from the outside (e.g., the user) for receiving commands or data to be used in a component (e.g., the processor  120 ) of the electronic device  101 , and may include, for example, a microphone, a mouse, or a keyboard. 
     The sound output device  155  is a device for outputting a sound signal to the outside of the electronic device  101 . The sound output device  155  may include, for example, a speaker for general use such as multimedia reproduction or sound reproduction and a receiver used only for telephone reception. According to one embodiment, the receiver may be formed integrally with or separately from the speaker. 
     The display device  160  is a device for visually providing information to a user of the electronic device  101  and may include, for example, a display, a hologram device, or a projector and a control circuit for controlling the corresponding device. According to one embodiment, the display device  160  may include a touch circuit or a pressure sensor capable of measuring the intensity of the pressure for touch. 
     The audio module  170  may bidirectionally convert sound and electrical signals. According to one embodiment, the audio module  170  may acquire sound through the input device  150  or may output sound through the sound output device  155  or an external electronic device (e.g., the electronic device  102  (e.g., a speaker or headphone)) connected with the electronic device  101  in a wireless or wired manner. 
     The sensor module  176  may generate an electrical signal or a data value corresponding to an internal operating state (e.g., power or temperature) of the electronic device  101  or an external environmental condition. The sensor module  176  may include, for example, a gesture sensor, a gyro sensor, an atmospheric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an infrared sensor, or an illuminance sensor. 
     The interface  177  may support a designated protocol that may be connected to an external electronic device (e.g., the electronic device  102 ) in a wired or wireless manner. According to one embodiment, the interface  177  may include a High Definition Multimedia Interface (HDMI), a Universal Serial Bus (USB) interface, an SD card interface, or an audio interface. 
     The connection terminal  178  may be a connector capable of physically interconnecting the electronic device  101  and an external electronic device (e.g., the electronic device  102 ), such as an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector). In certain embodiments, the electronic device  100  can be connected to a power adaptor for charging the battery  189  and an external electronic device simultaneously. The processor  120  can determine whether the electronic device  100  is connected to just the external electronic device, just the power adaptor, both, or neither, and control a switching circuit. 
     The haptic module  179  may convert an electrical signal into a mechanical stimulus (e.g., vibration or motion) or an electrical stimulus that the user can perceive through a tactile or kinesthetic sense. The haptic module  179  may include, for example, a motor, a piezoelectric element, or an electrical stimulation device. 
     The camera module  180  is a device that is capable of capturing, for example, a still image and a video image. According to one embodiment, the camera module  180  may include one or more lenses, an image sensor, an image signal processor, or a flash. 
     The power management module  188  is a module for managing power supplied to the electronic device  101 , and may be configured as at least a part of, for example, a Power Management Integrated Circuit (PMIC). 
     The battery  189  is a device for supplying power to at least one component of the electronic device  101  and may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell. 
     The communication module  190  may establish a wired or wireless communication channel between the electronic device  101  and an external electronic device (e.g., the electronic device  102 , the electronic device  104 , or the server  108 ) and may support communication via the established communication channel. The communication module  190  may include a processor  120  (e.g., an application processor) and one or more communication processors, which are independently operated and support wired communication or wireless communication. According to one embodiment, the communication module  190  may include a wireless communication module  192  (e.g., a cellular communication module, a short range wireless communication module, or a Global Navigation Satellite System (GNSS) communication module) or a wired communication module  194  (e.g., a Local Area Network (LAN) communication module or a power line communication module), and may communicate with an external electronic device via a first network  198  (e.g., a short-range communication network, such as Bluetooth, Wi-Fi direct, or Infrared Data Association (IrDA)) or a second network  199  (e.g., a long-range communication network, such as a cellular network, the Internet, or a computer network (e.g., a LAN or a WAN)), using a corresponding communication module among the above-mentioned communication modules. Various types of communication modules  190  described above may be implemented as a single chip or may be implemented as separate chips, respectively. 
     According to one embodiment, the wireless communication module  192  may identify and authenticate the electronic device  101  within the communication network using the user information stored in the subscriber identification module  196 . 
     The antenna module  197  may include one or more antennas configured to transmit/receive signals or power to/from the outside. According to one embodiment, the communication module  190  (e.g., the wireless communication module  192 ) may transmit/receive signals to/from an external electronic device via an antenna suitable for the communication scheme thereof. 
     Among the components described above, some components may be connected to each other via a communication scheme (e.g., a bus, a General-Purpose Input/Output (GPIO), a Serial Peripheral Interface (SPI), or a Mobile Industry Processor Interface (MIPI)) and may exchange signals (e.g., commands or data) therebetween. 
     According to one embodiment, the commands or data may be transmitted or received between the electronic device  101  and the external electronic device  104  via the server  108  connected to the second network  199 . Each electronic device  102  may be of a type, which is the same as or different from the electronic device  101 . According to one embodiment, all or some of the operations executed in the electronic device  101  may be executed in another external electronic device or a plurality of external electronic devices. According to one embodiment, in the case where the electronic device  101  should perform a certain function or service automatically or by a request, the electronic device  101  may request some functions, which are associated with the function or service, from an external electronic device, instead of, or in addition to, executing the functions or the service by itself. The external electronic device, which receives the request, may execute the requested functions or additional functions, and may transmit the results to the electronic device  101 . The electronic device  101  may provide the requested functions or services by processing the received results as they are or additionally. For this purpose, for example, a cloud computing technique, a distributed computing technique, or a client-server computing technique may be used. 
     The electronic device  101  can either be connected between a power supply and an external electronic device, or act as the external electronic device. Various embodiments disclosed herein provide a method and electronic device for controlling power between electronic devices, in which even when an external electronic device (e.g., a smart phone) in that is OFF is connected to an electronic device, the electronic device may be turned ON by a power supply connected to the electronic device, and the power of the external electronic device may be controlled by the electronic device that is turned ON. 
       FIG. 2  will describe an external electronic device comprising a smartphone according to various embodiments.  FIG. 3  will describe an electronic device comprising a Head Mounted Display (HMD) according to various embodiments.  FIG. 5  describes connection of the HMD (electronic device) connected to an external electronic device (smartphone) and a power supply.  FIG. 8-12  describe an apparatus for where the external electronic device that is OFF is connected to an electronic device that may be turned ON by a power supply connected to the electronic device, and the power of the external electronic device may be controlled by the electronic device that is turned ON.  FIGS. 13-15  describe methods for doing the same.  FIGS. 16-18  describe connectors that can be used by the electronic device and the external electronic device. 
     External Electronic Device (Smartphone) 
       FIG. 2  is a perspective view illustrating the external electronic device according to various embodiments, although in other embodiments,  FIG. 2  can act as the electronic device. Referring to  FIG. 2 , in an orthogonal coordinate system of three axes, an “X-axis” may correspond to the width direction of an electronic device  200  (e.g., the electronic device  101  or the electronic device  102  of  FIG. 1 ), a “Y-axis” may correspond to the length direction of the electronic device  200 , and a “Z-axis” may correspond to the thickness direction of the electronic device  200 . 
     The external electronic device  200  may include a housing  201 - 1 . According to one embodiment, the housing  201 - 1  may be formed of a conductive material and/or a non-conductive material. According to various embodiments, the external electronic device  200  may include a touch screen display  201 - 2  (e.g., the display device  160  of  FIG. 1 ), which is disposed so that at least a partial region of the housing  201 - 1  is exposed and visible outside the housing  201 - 1 . According to one embodiment, the touch screen display  201 - 2  may include a pressure sensor so as to operate as a pressure-responsive touch screen display. According to various embodiments, the external electronic device  200  may include a speaker  201 - 3 , which is disposed in the housing  201 - 1  of the electronic device  200  and configured to output the voice of another party during a phone call. According to one embodiment, the external electronic device  200  may include a microphone device  201 - 4 , which is disposed in the housing  201 - 1  and configured to transmit the user&#39;s voice to the other part during the phone call. According to one embodiment, the external electronic device  200  may include an ear jack connector  201 - 10 , which is disposed in the housing  201 - 1  and configured to insert an ear jack of an ear set thereinto. 
     According to various embodiments, the external electronic device  200  may include various components, which are disposed to be exposed in the touch screen display  201 - 2 , or in a manner of performing functions through the window but not being visibly exposed, in order to perform various functions of the external electronic device  200 . According to one embodiment, the components may include at least one sensor module  201 - 5 . The sensor module  201 - 5  may include, for example, an illuminance sensor (e.g., an optical sensor), a proximity sensor (e.g., an optical sensor), an infrared sensor, an ultrasonic sensor, a fingerprint recognition sensor, or an iris recognition sensor. According to one embodiment, the components may include a camera device  201 - 6 . According to one embodiment, the components may include an indicator  201 - 7  (e.g., an LED device) for visually providing status information of the electronic device to the user. According to one embodiment, at least one of these components may be disposed to be exposed through at least a partial region of the second plate  201 - 1 . 
     According to various embodiments, the external electronic device  200  may include another speaker  201 - 8 , which is disposed on one side of the microphone device  201 - 4 . According to one embodiment, the external electronic device may include a connector  201 - 9  (e.g., the connection terminal  178  of  FIG. 1 ) which is disposed on the other side of the microphone device  201 - 4  and allows the external electronic device to be connected to another device. According to one embodiment, the connector  201 - 9  may be a socket-type connector. 
     According to various embodiments, an opening  201 - 19  may be formed in at least a partial region of the housing  201 - 1  in order to expose the connector  201 - 9 , in which the connector  201 - 9  may be disposed in the opening  201 - 19 . According to various embodiments, a header-type external connector may be connected to the connector  201 - 9  in a forward or reverse direction. According to one embodiment, the external connector can be connected to the another device, and as the connector  201 - 9  and the external connector are coupled to each other, the external electronic device  200  and the another device can be connected to each other. According to various embodiments, the another device may be any of various devices that can be connected to the electronic device  200 . For example, the other device may include an audio device, a computer, a charger, a memory, a fan, or an antenna (e.g., a digital multimedia broadcast antenna or FM antenna). Additionally, the other device can be an electronic device such as a head mounted display (HMD). 
     The plurality of electronic devices  200  may operate by being interconnected with each other through wireless or wired communication. For example, a smart phone may provide contents by being fastened to a wearable device such as an HMD or the like. Hereinafter, a situation in which a smart phone and a wearable device such as an HMD or the like are fastened to each other so as to operate will be described. 
     An HMD device (a wearable device) according to various embodiments may be a device for displaying an image in the state of being in contact with both eyes of the user or being worn by the user. The HMD device may provide at least one of a see-through function for providing Augmented Reality (AR) or a see-closed function for providing Virtual Reality (VR). The see-through function may mean a function of providing additional information or an image as a single image in real time while transmitting actual external images to the user&#39;s eyes through a display. The see-closed function may mean a function of providing only the contents provided through the display, as an image. 
     Hereinafter, in the description of operations performed in relation to the power reception and supply of the HMD device, the electronic device  200  may be interpreted as an external electronic device connected to an electronic device comprising a HMD device. In addition, the power supply may be interpreted as an external electronic device or an external device that supplies power to the HMD device and an electronic device. 
     Electronic Device (Head Mounted Display) 
       FIG. 3  is a perspective view illustrating an electronic device comprising a HMD device according to various embodiments. 
     Referring to  FIG. 3 , the HMD device  300  may include a main frame  310  configured to detachably mount an electronic device  200  such as a smart phone thereon, and a mounting unit  320  connected to the main frame  310  and configured to fix the main frame  310  to a portion of the user&#39;s body. 
     The main frame  310  may include a user input module  311  capable of controlling the external electronic device  200 , a first interface unit  312  connected to the external electronic device  200 , a display position adjustment unit  313 , a proximity sensor  314 , and a second interface unit (not illustrated) connected to an external power supply or another external input device. 
     For example, the user input module  311  may include at least one of a physical key, a physical button, a touch key, a joystick, a wheel key, a touch pad, etc. When the user input module  311  is a touch pad, the touch pad may be disposed on a side face of the main frame  310 . The touch pad may include a control object (e.g., a Graphical User Interface (GUI) for controlling sound or image) indicating the functions of the external electronic device  200  or the HMD device  300 . 
     The first interface unit  312  may support the HMD device  300  to communicate with the external electronic device  200 . The first interface unit  312  may be connected to the interface unit (e.g., a USB port) of the external electronic device  200 , and may transmit a user input signal generated by the user input module  311  to the external electronic device  200 . For example, the first interface unit  312  may transmit a user input signal (e.g., a touch input) received from the user input module  311  to the external electronic device  200 . The external electronic device  200  may perform a function corresponding to the user input signal. For example, the external electronic device  200  may adjust the volume or reproduce an image in response to the touch input. 
     The proximity sensor  314  may sense the proximity of an object in a non-contact manner and may detect the position of the object. For example, when an object (e.g., a part of the user&#39;s body) is detected within a predetermined sensing distance, the proximity sensor  314  may transmit a sensed signal to the main control unit of the HMD device  300 . The proximity sensor  314  may not send any signal to the main control unit unless an object is detected within a predetermined sensing distance. The main control unit may determine that the user wears the HMD device  300  on the basis of the signal detected by the proximity sensor  314 . The proximity sensor  314  may be disposed on the upper portion of the inner side of the main frame  310  such that when the HMD device  300  is worn, the proximity sensor  314  can be located close to the user&#39;s forehead in order to easily determine whether or not the HMD device  300  is worn. 
     Although a proximity sensor is described herein, other sensors capable of determining whether or not the HMD device  300  is worn may be used according to the embodiment. For example, at least one of an acceleration sensor, a gyro sensor, a geomagnetic sensor, a gesture sensor, a biometric sensor, a touch sensor, an illuminance sensor, and a grip sensor may be mounted on the main frame  310 . 
     The main frame  310  may be configured to be detachable from an external device such as the electronic device  200 . For example, the main frame  310  may include a space, a structure, or a cavity configured to accommodate the electronic device  200  therein. A portion forming the space in the main frame  310  may include an elastic material. At least a part of the portion forming the space of the main frame  310  may be made of a flexible material such that the size or the volume of the space can be changed according to devices of various sizes accommodated in the space. 
     The rear face (inner face) of the main frame  310  may further include a face contact portion configured to be in contact the user&#39;s face, and a lens assembly including at least one lens at a location facing the user&#39;s two eyes may be inserted into a portion of the face contact portion. In the lens assembly, a display or a transparent/translucent lens may be implemented integrally with the face contact portion, or may be implemented to be detachably mountable to the face contact portion. A portion of the face contact portion may include a nose recess having a shape into which the user&#39;s nose can be inserted. 
     In one embodiment, the main frame  310  may be made of a material, such as a plastic material, that allows the user to feel comfortable and is able to support the external electronic device  200 . In another embodiment, the main frame  310  may be made of at least one of glass, ceramic, and a metal (e.g., aluminum) or a metal alloy (e.g., steel, stainless steel, a titanium or magnesium alloy) in order to ensure a strength or a beautiful appearance. 
     The mounting unit  320  may be worn on a portion of the user&#39;s body. The mounting unit  320  may be configured with a band made of an elastic material. In other embodiments, the mounting unit  320  may include eyeglass temples, a helmet, a strap, or the like. 
       FIG. 4  is a view illustrating how to couple the HMD device  300  and an external electronic device  200  (e.g., a smart phone) according to various embodiments. 
     Referring to  FIG. 4 , the HMD device  300  may further include a cover  330  configured to fix the external electronic device  200  coupled to the mainframe  310 . The cover  330  may be physically coupled to the main frame  310  in the form of, for example, a hook, or may be coupled in the same manner as a magnet or an electromagnet. The cover  330  may prevent the external electronic device  200  from being separated from the main frame  310  by the movement of the user, and may protect the external electronic device  200  from an external impact. 
     The main frame  310  and the display of the external electronic device  200  may be coupled to face each other. The user may connect the connector  201 - 9  of the external electronic device  200  to the first interface unit  312  of the main frame  310  and may then fit the cover  330  onto the HMD device  300  and the external electronic device  200 . 
     According to various embodiments, a connector  315 , to which an external device (e.g., a power supply) can be connected, may be disposed at one side (e.g., the lower portion) of the main frame  310  of the HMD device  300 . 
     Hereinafter, an example in which an external electronic device (e.g., a smart phone) is mounted on the HMD device will be described with reference to  FIGS. 5 and 6 . 
       FIG. 5  is a view illustrating an exemplary HMD device  500  according to various embodiments. Referring to  FIG. 5 , the HMD device  500  may be, for example, the electronic device  101 ,  102 , or  104  of  FIG. 1 . In addition, as described above, the HMD device  500  may provide only a function of a cradle that does not have a communication function with an electronic device  520 . The HMD device  500  may include a main body and a cover. 
     When the external electronic device  520  is mounted on the body portion  510  of the HMD device  500 , as illustrated, the cover may cover the rear edge of the external electronic device  520  so as to maintain the external electronic device  520  in the mounted state and may be fixed to the HMD device  500 . The HMD device  500  may have a support that can be used by the user to wear the HMD device  500  on his/her head. 
     In addition, the body  510  of the HMD device  500  may be provided with lenses at positions corresponding to the respective eyes of the wearer. The wearer is able to see the screen of the display (not illustrated) of the electronic device  520  through the lenses in the state in which the electronic device  520  is mounted on the body  510  of the HMD device  500 . The HMD device  500  may be a mechanical structure that can detachably mount the electronic device  520  as illustrated. 
     When the external electronic device  520  is mounted, the HMD device  500  may be connected to the external electronic device  520  via an interface such as a USB so as to communicate with the electronic device  520 . The external electronic device  520  may control the function corresponding to the input in response to the input received from the HMD device  500 . For example, the external electronic device  520  may adjust the volume or control a screen (e.g., a video reproduction screen in a virtual reality mode) in response to the received input. For example, when the external electronic device  520  is mounted on the HMD device  500 , the connector  521  of the external electronic device  520  is electrically connected to the connector  511  (e.g., the first connector) of the HMD device  500 , so that the devices can communicate with each other. The first connector  511  can include a power supply terminal and a data communication terminal. 
     The second connector  512  provided in at least a part of the HMD device  500  (for example, the lower portion of the device) may be connected to an external power supply or another external input device. The second connector  512  can include a a power supply terminal and a data communication terminal. For example, when the second connector  512  is connected to the external power supply  540 , the HMD device  500  may receive power from the external power supply  540 . The received power may be used as the operating power of the HMD device  500  or may be transferred to the external electronic device  520  to be used as the operating power of the external electronic device  520  or to charge the external electronic device  520 . Alternatively, when the second connector  512  is connected to the external input device, the HMD device  500  may receive an external input signal from the external input device and may transmit the external input signal to the main control unit of the HMD device  500 . 
     However, a problem can occur if the external power supply  540  is connected to an HMD device  500 , where power is not supplied to the HMD device or an external electronic device (e.g., a smart phone) connected to the HMD device when the HMD device is OFF. If in order for the HMD device to be turned ON, the HMD device  500  must receive power from the external electronic device  200  connected to the HMD device  500  and the HMD device must be booted, when the external electronic device is in the OFF state, even if both the power supply and the external electronic device are connected to the HMD device, the HMD device is not booted. Thus, it may not be possible to supply power to the HMD device or the external electronic device or to control the power of the external electronic device. 
     Various embodiments disclosed herein provide a method and electronic device for controlling power between electronic devices, in which even when an external electronic device (e.g., a smart phone)  200  that is OFF is connected to an electronic device (e.g., an HMD device)  500 , the electronic device  500  may be turned ON by a power supply connected to the electronic device  500 , and the power of the external electronic device  200  may be controlled by the electronic device  500  in the ON state. 
       FIG. 6  is a view illustrating an example in which the user wears the HMD device  500  equipped with the external electronic device  520  according to various embodiments. As illustrated in  FIG. 6 , the user may wear the HMD device  500  equipped with the external electronic device  520  on his/her head. The wearer can see the screen of the display of the mounted electronic device  520  through the lenses provided in the HMD device  500 . 
     In addition, as illustrated in  FIG. 6 , the functions of the HMD device  500  or the external electronic device  520  may be controlled through the touch pad  530  provided on the side face of the body  510  of the HMD device  500 . According to various embodiments, the information display in the virtual reality mode may be implemented in a smart phone, a mobile phone, or the like, and may also be implemented in the HMD device  500  (e.g., an HMD device). 
       FIG. 7  is a view illustrating a screen mode of an external electronic device according to various embodiments. Referring to  FIG. 7 , an external electronic device  700  may be the electronic device  200  or  520  of  FIG. 2 ,  FIG. 4 , or  FIG. 5 . When the external electronic device  700  operates in a normal mode, the external electronic device  700  may display one operation screen  710  as illustrated in the upper portion of  FIG. 7 . 
     According to various embodiments, when the external electronic device  700  is mounted on the HMD device, the external electronic device  700  may operate in a virtual reality mode (e.g., an HMD mode) as illustrated in the lower portion of  FIG. 7 . When the external electronic device  700  operates in the virtual reality mode, the external electronic device  700  may display a screen  720   a  corresponding to the left eye of the user and a screen  720   b  corresponding to the right eye to be differentiated from each other. In the screen of the virtual reality mode, one image may be displayed in the state of being divided into two images  720   a  and  720   b.    
     Examples of the above-mentioned electronic device, HMD device, or HMD device exemplify devices in which image data can be displayed according to embodiments, and the various embodiments are not limited to the above-mentioned devices. For example, embodiments may be applied to any type of devices capable of displaying image data according to various embodiments. 
     Hereinafter, the structure of a system according to various embodiments will be described in detail with reference to  FIGS. 8 to 12 , and power supply control procedures according to various embodiments will be described with reference to  FIGS. 13 to 15 . 
       FIG. 8  is a block diagram illustrating a schematic structure of a system according to various embodiments wherein an electronic device  810  that is OFF can be turned ON when power is transferred from either the external device  820  or the power supply  830 . Referring to  FIG. 8 , a system according to various embodiments may include an electronic device  810  (e.g., an HMD device), an external electronic device  820  (e.g., a smartphone), and a power supply  830  (e.g., a Travel Adapter (TA)). In the following embodiments, an HMD device will be described as an example of the electronic device  810 , and a smart phone will be described as an example of the external electronic device  820 . However, the electronic device  810  or the external electronic device  820  is not limited to the HMD device or the smartphone. 
     According to various embodiments, the electronic device  810  may include a first connector  811  and a second connector  812 . The electronic device  810  may be connected to the connector  821  of the external electronic device  820  through the first connector  811 . The connection may be so as to transmit or receive power or to transmit/receive data. The electronic device  810  may be connected to the connector  831  of the power supply  830  via the second connector  812 . The connection may be so as to transmit/receive power or to transmit/receive data. 
     The first connector  811  and the second connector  812  of the electronic device, the connector  821  of the external electronic device  820 , and the connector  831  of the power supply  830  are not limited to a specific form, a specific type, and a specific scheme of connectors. For example, each of the connectors  811 ,  812 ,  821 , and  831  according to various embodiments may be implemented as any connector that has a plurality of pins, and is capable of providing power through at least one pin, and of performing data communication with one or more other pins. For example, each of the connectors  811 ,  812 ,  821 , and  831  may be a universal serial bus (USB) connector, and as a more specific example, a USB type A connector (e.g., 1.1, 2.0, 2.3, etc.), a USB type B connector, a USB type C connector, a micro USB connector, and the like. 
     According to various embodiments, when the electronic device  810  and the external electronic device  820  are connected by the connectors  811  and  821 , power is transferred from the external electronic device  820  to the electronic device  810  and the power of the electronic device  810  can be turned ON from the OFF state by the supplied power. According to various embodiments, when the electronic device  810  and the power supply  830  are connected by the connectors  812  and  831 , power is transferred from the power supply  830  to the electronic device  810  and the power of the electronic device  810  can be turned ON from the OFF state by the supplied power. 
     According to various embodiments, when the electronic device  810  is connected to the external electronic device  820  and the power supply  830  through the first connector  811  and the second connector  812 , respectively, the electronic device  810  may receive power from the power supply  830  through the second connector  812  and may transmit the supplied power to the external electronic device  820  through the first connector  811 . 
     According to various embodiments, even when the external electronic device  820  is connected to the electronic device  810 , when the electronic device  810  is OFF, power may be supplied from the electronic device  810  to the external electronic device  820 . Power may be supplied so that the boot loader of the external electronic device  820  can be operated. Thus the external electronic device  820  can be charged. 
     According to various embodiments, when the electronic device  810  is connected to the external electronic device  820  and the power supply  830  through the first connector  811  and the second connector  812 , respectively, the electronic device  810  may transmit/receive data to/from the power supply  830  through the second connector  812 , and may transmit/receive data to/from the external electronic device  820  through the first connector  811 . 
     According to various embodiments, even when the external electronic device  820  is connected to the electronic device  810 , when the external electronic device is OFF, a power control message may be transmitted from the electronic device  810  to the external electronic device  820  so that the power of the external electronic device  820  can be controlled (e.g., from the OFF state to the ON state). According to various embodiments, when the first connector  811  is a USB type C connector, the power control message may be transmitted using a Vender Defined Message (VDM) via a Power Delivery (PD) communication protocol. 
       FIG. 9  is a diagram illustrating a detailed structure of the system according to various embodiments. Referring to  FIG. 9 , an electronic device  910  (e.g., an HMD device) according to various embodiments may operate in conjunction with an external electronic device  920  (e.g., a smart phone) or a power supply  930  (e.g., a TA). 
     The electronic device  910  can include a processor  915  that can detect whether the external electronic device  920  and/or the power supply  930  are connected, and control a switching circuit  913  based on whether only one of the external electronic device  920  and/or the power supply  930  are connected, or both the external electronic device  920  and/or the power supply  930  are connected. 
     When both the external electronic device  920  and the power supply  930  are connected, the processor  915  cause the switching circuit  913  to form a short, bypassing the electronic device  910 . As a result, a first terminal  912   a  of the second connector  912  provides power directly to a first terminal  911   a  of the first connector  911 . 
     When only one of the external electronic device  920  or the power supply  930  are connected, the processor  915  cause the switching circuit  913  to form an open circuit. The open circuit causes either the first terminal  911   a  of the first connector  911  or the second terminal  912   a  of the second terminal  912  to provide power to the external electronic device  920 , thereby turning the external electronic device  920  ON. 
     The electronic device  910  may correspond to an accessory device functionally connected to the external electronic device  920 . Herein, the external electronic device  920  may be referred to as a first external electronic device. The electronic device  910  may correspond to, for example, the HMD device described above. However, the electronic device  910  according to an embodiment is not limited thereto. In addition, the electronic device  910  may be implemented as a single device with, for example, the external electronic device  920  although illustrated separately from the external electronic device  920 . For example, the external electronic device  920  may be located in at least a portion of the electronic device  910 , or may be configured within the electronic device  910 . 
     The external electronic device  920  may be functionally connected to the electronic device  910 . For example, the external electronic device  920  may be a smart phone. However, the external electronic device  920  according to one embodiment is not limited to the smart phone. For example, the external electronic device  920  may include a mobile terminal device such as a tablet PC, a PDA, or the like. 
     The power supply  930  may include an auxiliary accessory device that is electrically connected to the electronic device  910 . For example, the power supply  930  may be a charging device capable of supplying power. The charging device may include, for example, a notebook PC, a Travel Charger (TA), an auxiliary battery, or the like. 
     The electronic device  910  and the external electronic device  920  may be connected via a wired communication interface. According to various embodiments, the electronic device  910  and the external electronic device  920  may be connected via an image communication interface (e.g., a High-Definition Multimedia Interface (HDMI), a Display Port (DP) interface, a Mobile High-definition Link (MHL) interface, a USB audio video device interface, or the like). The external electronic device  920  may be a source device for generating content data (e.g., image data) and the electronic device  910  may operate as a sink device for receiving contents and outputting or reproducing the contents, and vice versa. According to various embodiments, the electronic device  910  and the external electronic device  920  may be connected via a USB communication interface. The external electronic device  920  may operate as a USB host and the electronic device  910  may operate as a USB client, and vice versa. 
     The electronic device  910  and the external electronic device  920  may be connected via a connector. The connector may transmit analog or digital data to and from the device. The connector may transmit power to and from the device. According to various embodiments, the connector may be a USB Type C connector. The electronic device  910  and the external electronic device  920  may exchange data and power with each other via the USB Type C connector. According to various embodiments, when connected via a USB Type C connector, the electronic device  910  and the external electronic device  920  may be connected in an alternate mode to each other. For example, a video signal of a video communication interface (e.g., DisplayPort interface of VESA) may be transmitted or received via a USB connector. 
     In the embodiments, the types of the wired communication interface and connector used by the electronic device  910  and the external electronic device  920  are not limited to any one type. 
     When the electronic device  910  is electrically connected to the external electronic device  920 , the electronic device  910  can receive power from the external electronic device  920 . For example, the electronic device  920  may be powered from the external electronic device  920  via a power terminal of the connector (e.g., V_BUS of a USB connector). The electronic device  910  may be driven using power supplied from the external electronic device  920 . 
     The electronic device  910  may be powered from the power supply  9 when electrically connected to the power supply  930 . At this time, the electronic device  910  may be driven using the power supplied from the power supply  930 , and may request the external electronic device  920  to stop supplying power. For example, when the connection of the power supply  930  is sensed, the electronic device  910  may send status information to the external electronic device  920 , indicating that the power supply  930  is connected. 
     According to one embodiment, the status information may be transmitted to the external electronic device  920  via a data communication terminal of the connector (e.g., D+, D−, Rx, Tx, or CC terminal of the USB connector, etc.). The data communication terminal may include, for example, a positive data communication terminal (D+) and a negative data communication terminal (D−) of a USB interface. According to another example, the status information may be transmitted to the external electronic device  920  through a terminal transmitting a variable resistance signal of the connector (e.g., in a manner similar to the ID terminal of a micro USB connector). 
     The electronic device  910  may supply power to the external electronic device  920  when electrically connected to the power supply  930 . For example, the electronic device  910  may supply power to the external electronic device  920  via a power terminal (e.g., V_BUS) of the USB interface. The external electronic device  920  may be driven using power supplied from the electronic device  910 . 
     The status information may be a data type corresponding to a USB device class for communication with, for example, a keyboard, a mouse, a touch, a virtual reality (VR) sensor, an audio or video device, or the like. At this time, the status information may be produced as one of a key value, a mouse coordinate value, a touch coordinate value, a virtual reality sensor value, and an audio or video device control signal value. For example, in the case where the keyboard device class is used, when the connection of the power supply  930  is sensed, the electronic device  910  may generate a key value (e.g., 0x2fd or 0x2fe) corresponding to the set key as if a preset key were pressed and may transmit the generated key value to the external electronic device  920  via a data communication terminal. 
     The status information in the case where the power supply  930  is connected in the state in which the electronic device  910  and the external electronic device  920  are connected and the state information in the case where the external electronic device  920  is connected in the state in which the electronic device  910  and the power supply  930  are connected may have different values. For example, when the power supply  930  is connected in the state in which the electronic device  910  and the external electronic device  920  are connected, the status information may be Ox2fd. When the external electronic device  920  is connected in the state in which the electronic device  910  and the power supply  930  are connected, the status information may be Ox2fe. 
     The electronic device  910  and the external electronic device  920  can communicate information to each other and identify each other via the ID terminal of the connector. According to various embodiments, the status information may be, for example, a data type that may be transmitted through the ID terminal of the connector. 
     According to one embodiment, the connector may include an ID terminal that supports a “digital ID” scheme (e.g., the USB Type C connector is a CC terminal). In various embodiments, the status information may be a data type that can be transmitted and received via the digital ID terminal included in the connector. 
     According to another embodiment, the connector may include an ID terminal that supports a “resistance ID” scheme (e.g., the ID terminal of a micro USB connector). In various embodiments, the status information may be a data type that is transmitted in the manner of changing a resistance value through a “resistance ID” terminal included in the connector. 
     A part of the power supplied from the power supply  930  may be used to drive the electronic device  910  and another part of the power may be supplied to the external electronic device  920  via the power terminal described above. For example, the external electronic device  920  may drive the external electronic device  920  using the power of the power supply  930  that is supplied via the electronic device  910 . Further, the external electronic device  920  can charge the battery  922  electrically connected thereto. 
     As such, the electronic device  910  according to an embodiment may transmit status information indicating that the power supply  930  is connected thereto to the external electronic device  920  via data communication (e.g., software information) without an additional component (e.g., a hardware device). 
     The electronic device  910 , the external electronic device  920 , and the power supply  930  may be connected via various communication interfaces. For example, the electronic device  910  may include a High Definition Multimedia Interface (HDMI), an optical interface, a D-SUB, or a lightning terminal, and may be connected to the external electronic device  920  or the power supply  930  on the basis of the HDMI, the optical interface, the D-SUB, or the lightning terminal. 
     The electronic device  910  may include a processor  915  (e.g., a Micro Controller Unit (MCU), a power management IC  914 , an identification circuit  916  (e.g., a CCPD IC), a first connector  912 , a second connector  911 , a switching circuit  913 , and/or a storage unit (not illustrated). 
     The processor  915  may control the operation of the electronic device  910  and/or a signal flow between blocks of the electronic device  910  and may perform a data processing function to process data. For example, processor  915  may be a Central Processing Unit (CPU), an Application Processor (AP), a Micro-Controller Unit (MCU), or a Micro-Processor Unit (MPU), and the like. The processor  915  may be formed as a single core processor or a multi-core processor. 
     The processor  915  may inform the external electronic device  920  of a change in the state of the electronic device  910  such as detachment of the power supply  930 . For example, when the connection between the power supply  930  and the electronic device  910  is released, the processor  915  may recognize this via an interrupt signal line connected to the second connector  911 . The processor  915  may communicate with the external electronic device  920  to inform the electronic device  910  of a state change. When the power supply  930  and the electronic device  910  are connected to each other, the processor  915  may recognize this via the interrupt signal line connected to the second connector  912 . The processor  915  may communicate with the external electronic device  920  to inform the external electronic device  920  of the state change of the electronic device  910 . 
     The power management circuit  914  may control the voltage of the power supplied to each component included in the electronic device  910 . The power management circuit  914  may output a preset voltage (e.g., 3.0 V). For example, the power management circuit  914  may include a Low Drop-Out (LDO) voltage regulator. 
     The power management circuit  914  may receive the power of the external electronic device  920  or the power supply  930  and may output the preset voltage (e.g., 3.0 V). For example, when only the external electronic device  920  is connected without the connection of the power supply  930 , the power management circuit  914  may receive the power supplied via the power terminal (V_BUS)  911   a  of the first connector  911  and may output the preset voltage. Alternatively, when the power supply  930  is connected to the electronic device  910 , the power management circuit  914  may receive the power supplied from the power supply  930  via the second connector  912  and may output the preset voltage. 
     The identification circuit  916  may transmit data received via the data communication terminal  911   b  of the first connector  911  to the processor  915  and may transmit the message or information produced by the processor  915  to the external electronic device  920  via the data communication terminal  911   b  of the first connector  911 . The identification circuitry  916  may include at least one of a Micro-USB Interface Controller (MUIC), a Cable and Connector Integrated Chip (CCIC), and a Power Delivery Integrated Chip (PDIC). According to various embodiments, the identification circuit  916  may determine whether the connection to the external electronic device  920  or the power supply  930  is made or released. For example, when the first connector  911  or the second connector  912  is a connector supporting the USB C type, the electronic device  910  may determine whether the external electronic device  920  is connected or released, or may determine whether the power supply  930  is connected or disconnected, via a CC line. 
     The switching circuit  913  may include at least one element according to various embodiments and may be configured as a circuit that changes a current transmission path according to a specific control signal or a specific condition or cuts off or connects the current transmission path. For example, the switching circuit  913  may include at least one (Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET). 
     In certain embodiments, the processor  915  can provide gating or biasing signals, causing the at least one MOSFET to form an open circuit or a short circuit. 
     A storage unit (not illustrated) may store applications necessary for an Operating System (OS) of the electronic device  910  and other options functions such as an audio reproduction function, an image or video reproduction function, and the like. The storage unit may correspond to the memory  130  of  FIG. 1 . 
     The storage unit may store various pieces of information and various programs necessary for controlling the power management method according to one embodiment. For example, the programs may include a routine for sensing the connection of the power supply  930 , a routine for controlling on/off of the switching circuit  913  according to whether or not the power supply  930  is connected, a routine for producing status information for informing the connection of the power supply  930 , or the like. 
     The first connector  911  may include a device for functionally connecting the external electronic device  920 . The first connector  911  may include a power supply terminal  911   a  for power supply or reception, and a data communication terminal  911   b  and/or a ground terminal (not illustrated) for data communication with the external electronic device  920 . The arrangement of the power supply terminal  911   a,  the data communication terminal  911   b,  and the like is not limited to that illustrated in  FIG. 9 , but may be modified according to the characteristics of the electronic device  910 . The power supply terminal  911   a  may be referred to as a first pin, and the data communication terminal  911   b  may be referred to as a second pin. According to various embodiments, the first pin or the second pin may be configured with one pin or a plurality of pins. 
     According to various embodiments, the first connector may have a USB connector specification. In this case, the power supply terminal  911   a  may correspond to the VBUS terminal of the USB connector, and the data communication terminal  911   b  may correspond to D+ and D− terminals or Tx and Rx terminals. 
     The power supply terminal  911   a  may receive the power transmitted from the external electronic device  920  and may transmit the power transmitted from the power supply  930  to the external electronic device  920 . 
     The data communication terminal  911   b  may include, for example, D+ and D− terminals, and/or Tx+/− and Rx+/− terminals. Various terminal names may be used depending on connectors. The electronic device  910  may transmit/receive information to/from the external electronic device  920  via the data communication terminal  911   b.    
     The second connector  912  may include a device for electrically connecting the external electronic device  930 . The second connector  912  may include a power supply terminal  912   a  for power supply or reception, and a data communication terminal  912   b  and/or a ground terminal (not illustrated) for data communication with the power supply  930 . The arrangement of the power supply terminal  912   a,  the data communication terminal  912   b,  and the like is not limited to that illustrated in  FIG. 9 , but may be modified according to the characteristics of the electronic device  910 . The second connector  912  may further include a device for identifying the type of the external electronic device  930 . Like the first connector  911 , the second connector  912  may include a USB interface specification. Thus, the second connector  912  may be similar to the first connector  911  described above in terms of configuration and operation. The power supply terminal  912   a  may be referred to as a third pin, and the data communication terminal  912   b  may be referred to as a fourth pin. According to various embodiments, the third pin or the fourth pin may be configured with one pin or a plurality of pins. 
     The connection sensing circuit (not illustrated) may check whether or not the external electronic device (e.g., the power supply  930 ) connected to the first pin is detached via the second connector  912 . For example, the connection sensing circuit may check whether the power supply  930  is connected to or disconnected from the electronic device  910  via the second connector  912 . The connection sensing circuit may also transmit information on the connection or disconnection of the power supply  930  to the processor  915 . 
     Meanwhile, although not illustrated in  FIG. 9 , the electronic device  910  according to an embodiment may selectively further include components such as an input module such as a touch pad, a button key, a touch key, or the like, a digital sound source reproduction module, and/or various sensor modules such as an infrared sensor module, an illuminance module, or the like, a display module, and the like. In addition, the electronic device  910  according to an embodiment may further include components having the same level as the above-mentioned components. 
     The external electronic device  920  may include a processor  924  (e.g., a CPU or an AP), a power management circuit  923 , a battery  922 , a connector  921 , an identification circuit  926 , and/or a memory  925 . 
     The connector  921  may include a device to be functionally connected to the electronic device  910 . The connector  921  may include a power supply terminal  921   a  for power supply or reception, and a data communication terminal  921   b  and/or a ground terminal (not illustrated) for data communication with the electronic device  910 . Herein, the power supply terminal  921   a  may be referred to as a fifth pin, and the data communication terminal  921   b  may be referred to as a sixth pin. 
     According to various embodiments, the connector may have a USB connector specification. In this case, the power supply terminal  921   a  may correspond to the VBUS terminal of the USB connector, and the data communication terminal  921   b  may correspond to D+ and D− terminals or Tx and Rx terminals. 
     The power supply terminal  921   a  may receive power transmitted from power supply  930  via the electronic device  910 . The data communication terminal  921   b  may include, for example, D+ and D− terminals, and/or Tx+/− and Rx+/− terminals. Various terminal names may be used depending on connectors. The external electronic device  920  may transmit/receive information to/from the electronic device  910  via the data communication terminal  921   b.    
     The battery  922  may supply power to each component included in the external electronic device  920 . The battery  922  may be, for example, a rechargeable secondary battery. The battery  922  may be, for example, a battery that is electrically connected to the external electronic device  920 , an embedded battery that is embedded in the external electronic device  920 , or a detachable battery that is detachable by a user. 
     A memory  925  may store applications necessary for an OS of the external electronic device  920  and other options functions such as an audio reproduction function, an image or video reproduction function, and the like. The memory  925  may correspond to the memory  130  of  FIG. 1 . 
     The power management circuit  923  may adjust the power to be supplied to the external electronic device  920 . The power management circuit  923  may include a Power Management Integrated Circuit (PMIC) (not illustrated), a voltage regulator (not illustrated), a power input/output unit, a charging IC (not illustrated), etc. In addition, a combination of various ICs, circuits, and software may have roles for power control and voltage regulation. 
     When the electronic device  910  and the power supply  930  are connected, the power management circuit  923  may receive power supplied from the power supply  930  via the power supply terminal  921   a  of the connector  921 . In addition, when the connection between the electronic device  910  and the power supply  930  is released, the power management circuit  923  may supply power to the electronic device  910  via the power supply terminal  921   a  of the connector  921 . 
     The power management circuit  923  may supply the power of the battery  922  to the electronic device  910  or may charge the battery  922  with the power supplied from the outside in response to the state of the external electronic device  920 . 
     The processor  924  of the external electronic device  920  may perform functions of controlling the overall operations of the external electronic device  920  and a signal flow between the internal blocks of the external electronic device  920 , and may perform a data processing function for processing data. For example, the processor  924  of the external electronic device  920  may be a CPU, an AP, or the like. The processor  924  of the external electronic device  920  may be formed as a single core processor or a multi-core processor. Alternatively, the processor  924  of the external electronic device  920  may be configured with multiple processors. 
     The processor  924  of the external electronic device  920  may receive from the electronic device  910  a notification as to whether the electronic device  910  and the power supply  930  are connected or disconnected. The processor  924  of the external electronic device  920  may control the operation of the above-described power management circuit  923  based on this notification. 
     The identification circuit  926  is connected to the ID terminal  921   b  of the connector  921 . The identification circuit  926  may determine what the external device connected to the connector  921  is and may transmit identification information on the external electronic device (e.g., the electronic device  910 ) to the processor  924  of the external electronic device  920 . As illustrated, the identification circuit  926  may be implemented in the form of a separate chip in the processor  924  of the external electronics  920 . Alternatively, the identification circuit  926  may be implemented to be included in a part of the processor  924  of the external electronics  920 . 
     For example, in the case of a USB Type C connector, the ID terminal  921   b  may correspond to a CC terminal, and the identification circuit  926  may correspond to a Configuration Channel Integrated Circuit (CCIC). The USB connector may have two CC terminals. For example, the CCIC (corresponding to the identification circuit  926  in the drawing) may determine the directionality of the cables connected to the connector  921 . One of the CC terminals may be used for the purpose of transmitting power to the cables (or the external electronic device), and the remaining one of the CC terminals may be used for the purpose of determining what the device connected to the connector  921  is by communicating with a counterpart device connected via the cables and of managing the connection. 
     Various embodiments may be implemented in which the identification circuit  926  is omitted. For example, in various embodiments, the external electronic device  920  may be implemented without including the identification circuit  926 . The external electronic device  920  may operate in a charging mode, an OTG (on the go) mode, or a power path mode, etc., under the control of the processor  924  of the external electronic device  920 . 
     The charging mode is a mode for charging the battery  922  using power input from the outside. For example, the external electronic device  920  may charge the battery  922 , via the power management circuit  923 , with the power supplied from the power supply terminal  921   a.  According to one embodiment, when operating in the charging mode, the external electronic device  920  may supply a part of the power supplied from the outside to the battery  922  via the power management circuit  923  and may supply the remaining of the power to the components of another mobile terminal, for example, the processor  924 , the identification circuit  926 , etc., of the external electronic device  920 . 
     The OTG mode is a mode in which the external electronic device  920  can supply power to various external devices, which are connected via a connectable interface, such as a mouse, a keyboard, and a USB memory. According to one embodiment, when the electronic device  910  is connected to the external electronic device  920 , the external electronic device  920  operates in the OTG mode, and the power of the battery  922  can be supplied to the electronic device  910  via the power supply terminal  921   a.    
     The power path mode is a mode in which the power, which is input from the outside to the external electronic device  920  via the power management circuit  923 , is not supplied to the battery  922  and the power management circuit  923  does not supply the power to the components of another mobile terminal. For example, according to an embodiment, the external electronic device  920  may receive a part of the power from the power supply  930  electrically connected to the electronic device  910  and may provide the power to the power management circuit  923  without supplying the power to the battery  922 . 
     The power supply  930  may include a control circuit  932 , a connector  931 , and a power connector  933 . 
     The connector  931  may include a device to be functionally connected to the electronic device  910 . The connector  931  may include a power supply terminal  931   a  for power supply or reception, and a data communication terminal  931   b  and/or a ground terminal (not illustrated) for data communication with the electronic device  910 . Herein, the power supply terminal  931   a  may be referred to as a seventh pin, and the data communication terminal  931   b  may be referred to as an eighth pin. 
     According to various embodiments, the connector may have a USB connector specification. In this case, the power supply terminal  931   a  may correspond to the VBUS terminal of the USB connector, and the data communication terminal  931   b  may correspond to D+ and D− terminals or Tx and Rx terminals. 
     The power supply  930  may be supplied with commercial power through the power supply connector  933  and may supply the power to the electronic device  910  via the power supply terminal  931   a.  The data communication terminal  931   b  may include, for example, D+ and D− terminals, and/or Tx+/− and Rx+/− terminals. Various terminal names may be used depending on connectors. The power supply  930  may transmit/receive information to/from the electronic device  910  via the data communication terminal  931   b.    
     Hereinafter, various examples in which the electronic device  910  is connected to the external electronic device  920  and/or the power supply  930  so as to receive and transmit power in accordance with various embodiments will be described with reference to  FIGS. 10 to 12 .  FIGS. 10 and 11  illustrate when one but not both of the external electronic device  920  or the power supply  930  are connected to the electronic device  910 . The processor  924  causes the switching circuit  913  to form an open circuit, thereby causing either the first terminal  912   a  of the second connector  912  to provide power to the electronic device ( FIG. 10 ) or the first terminal  911   a  of the first connector  911  ( FIG. 11 ) to provide power to the electronic device.  FIG. 12  illustrates when both the external electronic device  920  and the power supply  930  are connected to the electronic device  910 . The processor  924  cause the switching circuit  913  to form a short circuit, thereby causing the first terminal  912   a  of the second connector  912  to provide power to the second terminal  911   a  of the first connector  911 . 
       FIG. 10  is a diagram illustrating a detailed structure of the system according to various embodiments. Referring to  FIG. 10 , according to various embodiments, when the power supply  930  is connected to the electronic device  910 , the electronic device  910  may be powered from the power supply  930 . The processor  924  causes the switching circuit  913  to form an open circuit, thereby causing the first terminal  912   a  of the second connector  912  to provide power to the electronic device. 
     When the second connector  912  of the electronic device  910  is connected to the connector  931  of the power supply  930 , the power supplied from the power supply  930  may be transmitted to the power supply terminal  912   a  of the second connector  912  via the power supply terminal  931   a  of the connector  931 . 
     In the state in which the electronic device  910  is connected to the power supply  930  but is not connected to the external electronic device  920 , the switching circuit  913  may be controlled to maintain the OFF state. For example, when the processor  915  of the electronic device  910  determines that the electronic device  910  is connected to the power supply  930  but is not connected to the external electronic device  920 , the switching circuit  913  may be controlled to be in the OFF state. The on/OFF state control of the switching circuit  913  may be directly controlled by the processor  915 , or may be controlled via the power management circuit  914 . As used herein the “OFF state” of the switching circuit  913  shall be understood to refer to the open circuit or high impedance state. The “ON state” shall be understood to refer to the short circuit or low impedance state. 
     According to various embodiments, the power transmitted from the power supply  930  may be received via the power supply terminal  931   a  of the second connector  912 , and the received power may be branched to the switching circuit  913  or the power management circuit  914  within the electronic device  910 . According to various embodiments, since the switching circuit  913  is controlled to be in the OFF state, the received power can be provided to the power management circuit  914 . 
     The power management circuit  914  can drive the electronic device  910  by supplying the received power to the processor  915  and/or the identification circuitry  916 . For example, when the electronic device  910  is powered from the power supply  930  in the power-OFF state, the electronic device  910  may be switched to the power-ON state or a boot loader, which is responsible for booting the electronic device  910 , may operate. 
     When the electronic device  910  is switched to the power-ON state by the power supply, the identification circuit  916  may operate, and the power-related communication, other various data communication, or the like may be performed between the electronic device  910  and the power supply  930  using the data communication terminals  912   b  and  931   b  via the identification circuit  916 . For example, the power-related communication may be performed via a CCPD interface, and when the second connector  912  and the connector  931  are USB type C connectors, the power-related communication may be performed through a Vender Defined Message (VDM) using a PD communication protocol. 
       FIG. 11  is a diagram illustrating a detailed structure of the system according to various embodiments. Referring to  FIG. 11 , according to various embodiments, when the external electronic device  920  is connected to the electronic device  910 , the electronic device  910  may be powered from the power supply  930 . The processor  924  causes the switching circuit  913  to form an open circuit, thereby causing the first terminal  911   a  of the first connector  911  to provide power to the electronic device. 
     When the first connector  911  of the electronic device  910  is connected to the connector  921  of the external electronic device  920 , the power supplied from the external electronic device  920  may be transmitted to the power supply terminal  911   a  of the first connector  911  via the power supply terminal  921   a  of the connector  921 . 
     In the state in which the electronic device  910  is not connected to the power supply  930  but is connected to the external electronic device  920 , the switching circuit  913  may be controlled to maintain the OFF state. For example, when the processor  915  of the electronic device  910  determines that the electronic device  910  is not connected to the power supply  930  but is connected to the external electronic device  920 , the switching circuit  913  may be controlled to be in the OFF state. The on/OFF state control of the switching circuit  913  may be directly controlled by the processor  915 , or may be controlled via the power management circuit  914 . 
     According to various embodiments, the power transmitted from the external electronic device  920  may be received via the power supply terminal  911   a  of the first connector  911 , and the received power may be branched to the switching circuit  913  or the power management circuit  914  within the electronic device  910 . According to various embodiments, since the switching circuit  913  is controlled to be in the OFF state, the received power can be provided to the power management circuit  914 . 
     The power management circuit  914  may drive the electronic device  910  by supplying the received power to the processor  915  and/or the identification circuitry  916 . For example, when the electronic device  910  is powered from the power supply  930  in the power-OFF state, the electronic device  910  may be switched to the power-ON state or a boot loader, which is responsible for booting the electronic device  910 , may operate. 
     When the electronic device  910  is switched to the power-ON state by the power supply, the identification circuit  916  may operate, and the power-related communication may be performed between the electronic device  910  and the external electronic device  920  using the data communication terminals  911   b  and  921   b  via the identification circuit  916 . For example, the power-related communication may be performed via a CCPD interface, and when the first connector  911  and the connector  921  are USB type C connectors, the power-related communication may be performed through a Vender Defined Message (VDM) using a PD communication protocol. 
       FIG. 12  is a diagram illustrating a detailed structure of the system according to various embodiments. When both the external electronic device  920  and the power supply  930  are connected to the electronic device  910 , the processor  924  causes the switching circuit  913  to form a short circuit, thereby causing the first terminal  912   a  of the second connector  912  to provide power to the second terminal  911   a  of the first connector  911 . 
     Referring to  FIG. 12 , according to various embodiments, when the external electronic device  920  and the power supply  930  are connected to the electronic device  910 , the electronic device  910  may supply the power received from the power supply  930  to the external electronic device  920 . When the first connector  911  of the electronic device  910  is connected to the connector  921  of the external electronic device  920  and the second connector  921  is connected to the connector  931  of the power supply  930 , the power supplied from the power supply  930  may be transmitted to the power supply terminal  912   a  of the second connector  912  via the terminal  931   a.    
     In the state in which the electronic device  910  is simultaneously connected to the power supply  930  and the external electronic device  920 , the switching circuit  913  may be controlled to maintain the ON state. For example, when the processor  915  of the electronic device  910  determines that the electronic device  910  is concurrently connected to the power supply  930  and the external electronic device  920 , the switching circuit  913  may be controlled to be in the ON state. The on/OFF state control of the switching circuit  913  may be directly controlled by the processor  915 , or may be controlled via the power management circuit  914 . 
     According to various embodiments, the power transmitted from the power supply  930  may be received via the power supply terminal  931   a  of the second connector  912 , and the received power may be branched to the switching circuit  913  or the power management circuit  914  within the electronic device  910 . According to various embodiments, since the switching circuit  913  is controlled to be in the ON state, the received power may be transmitted to the external electronic device  920  via the switching circuit  913  and through the power supply terminal  911   a  of the first connector  911 . 
     The external electronic device  920  may receive the power transmitted from the electronic device  910  via the power supply terminal  921   a  of the connector  921  and may provide the received power to the power management circuit  923 . 
     When the external electronic device  920  is in the OFF state, the power management circuit  923  may drive the external electronic device  920  by supplying the received power to the processor  924  and/or the identification circuitry  926 . For example, when the external electronic device  920  is powered from the power supply  930  via the electronic device  910  in the power-OFF state, the external electronic device  920  may be switched to the power-ON state or a boot loader, which is responsible for booting the external electronic device  920 , may operate. 
     When the external electronic device  920  is switched to the power-ON state or the boot loader operates by the power supply, the identification circuit  926  may operate, and the power-related communication, other various data communication, or the like may be performed between the external electronic device  920  and the electronic device  910  using the data communication terminals  911   b  and  921   b  via the identification circuit  926 . For example, the power-related communication may be performed via a CCPD interface, and when the first connector  911  and the connector  921  are USB type C connectors, the power-related communication may be performed through a Vender Defined Message (VDM) using a PD communication protocol. 
     An electronic device according to any one of various embodiments may include: a first connector including at least one first pin and at least one second pin configured to be connected to an external electronic device; a second connector including at least one third pin and at least one fourth pin configured to be connected to a power supply; a switching circuit; and a processor electrically connected to the first connector, the second connector, and the switching circuit. The processor is configured to check a connection with the external electronic device or a connection with the power supply and is connected to the external electronic device via the first connector, and The processor may be set to supply, when connected to the power supply via the second connector, power received from the power supply via the at least one third pin to the at least one first pin using the switching circuit. 
     According to various embodiments, the processor may be set to transmit, when it is determined that the power of the external electronic device is in an OFF state using the first connector, information related to control of power of the external electronic device via the at least one second pin of the first connector. 
     According to various embodiments, the second connector may support a Universal Serial Bus (USB) scheme. 
     According to various embodiments, the first connector may support a USB scheme, and the processor may be set to determine that the power of the external electronic device is in an OFF state when a designated signal is not received using the first connector. 
     According to various embodiments, the at least one second pin may include a Configuration Channel (CC) pin. 
     According to various embodiments, the information related to the control of the power may be included in a Vendor Defined Message (VDM) according to a Power Delivery (PD) communication standard. 
     According to various embodiments, the electronic device may include a Head-Mounted Display (HMD) device capable of being engaged with the external electronic device. 
     An electronic device according to any one of various embodiments may include: a first connector including at least one first pin and at least one second pin configured to be connected to an external electronic device; a second connector including at least one first pin and at least one second pin configured to be connected to a power supply; a switching circuit set to supply, when connected to the external electronic device via the first connector and connected to the power supply via the second connector, power received from the power supply via the at least one third pin to the at least one first pin; and a processor set to transmit, when it is confirmed that the power of the external electronic device is in an OFF state using the first connector, information related to control of power of the external electronic device via the at least one second pin of the first connector. 
     According to various embodiments, the second connector may support a USB scheme. 
     According to various embodiments, the first connector may support a USB scheme. 
     According to various embodiments, the at least one second pin may include a CC pin. 
     According to various embodiments, the information related to the control of the power may be included in a VDM according to a Power Delivery PD communication standard. 
     According to various embodiments, the electronic device may include a Head-Mounted Display (HMD) device capable of being engaged with the external electronic device. 
     Hereinafter, descriptions will be made of a power control procedure according to various embodiments with reference to  FIGS. 13 to 15 . 
       FIG. 13  is a flowchart illustrating a power control procedure between electronic devices according to various embodiments. Referring to  FIG. 13 , in operation  1301 , when a power supply (e.g., the power supply  930  of  FIGS. 9 to 12 ) is connected to a second connector of an electronic device (e.g., the electronic device  910  (e.g., an HMD) of  FIGS. 9 to 12 ) (such as in  FIG. 10 ), the power of the electronic device may be in an ON state by the supplied power in operation  1303 . 
     When an external electronic device (e.g., the external electronic device  920  of  FIGS. 9 to 12 ) is connected to a first connector  911  of the electronic device in operation  1305  (such as in  FIG. 12 ), the electronic device may determine whether the power of the external electronic device is the ON state in operation  1307 . 
     According to various embodiments, the method of determining by the electronic device  910  whether the power of the external electronic device  920  is in the ON state may be implemented in various ways. For example, the electronic device  910  may determine the power state of the external electronic device  920  by detecting signal, voltage, and resistance values input through at least one pin provided in the first connector  911  connected to the external electronic device  920 . According to various embodiments, when the electronic device  910  fails to receive a designated signal through at least one pin provided in the first connector  911  connected to the external electronic device  920 , it may be determined that the power of the power supply  920  is in the OFF state. 
     According to various embodiments, the identification circuit  910  of the electronic device  910  is configured to determine whether the power of the external electronic device  920  is in the ON state or in the OFF state from a signal received via the data communication terminal  911   b  (e.g., the second pin) of the first connector  911 . 
     When it is determined that the power of the external electronic device is in the ON state, in operation  1309 , the electronic device may receive various data from the external electronic device and may operate preset functions (e.g., functions that operate as the HMD device). According to various embodiments, in operation  1313 , the electronic device may supply power to the external electronic device while operating the preset functions through communication with the external electronic device. 
     When it is determined that the power of the external electronic device is not in the ON state, the electronic device may control the switching circuit (e.g., the switching circuit  913  of  FIGS. 10 to 12 ) provided in the electronic device to be in the ON state in operation  1311 . Various embodiments may be implemented such that, when the power of the external electronic device is not in the ON state, it is possible for the user to select whether power is supplied to the external electronic device from the electronic device using various input interfaces (e.g., touch screen, physical key, etc.) provided in the electronic device. 
     In operation  1313 , as the switching circuit is controlled to be in the ON state, the electronic device may supply power received from the power supply to the external electronic device. 
     When the electronic device determines that the power of the external electronic device is controlled (e.g., controlled to be turned ON from the OFF state) in operation  1315 , the electronic device may transmit a power control message to the external electronic device in operation  1317 . Various embodiments may be implemented such that the user may select whether to control the power of the external electronic device using various input interfaces (e.g., a touch a screen, a physical key, etc.) provided in the electronic device. 
     According to various embodiments, when the power of the external electronic device is in the ON state, a specific power control message (e.g., a message for controlling power to the OFF state from the ON state) may be transmitted to the external electronic device such that the external electronic device can receive power from the electronic device even in the OFF state. 
       FIG. 14  is a flowchart illustrating a power control procedure between electronic devices according to various embodiments. Referring to  FIG. 14 , in operation  1401 , when an external electronic device (e.g., the external electronic device  920  of  FIGS. 9 to 12 ) is connected to a first connector of an electronic device, such as in  FIG. 11 , (e.g., the electronic device  910  (e.g., an HMD) of  FIGS. 9 to 12 ), the electronic device may determine whether the power of the external electronic device is in the ON state in operation  1403 . 
     According to various embodiments, the method of determining by the electronic device  910  whether the power of the external electronic device  920  is in the ON state may be implemented in various ways. For example, the electronic device  910  may determine the power state of the external electronic device  920  by detecting signal, voltage, and resistance values input through at least one pin provided in the first connector  911  connected to the external electronic device  920 . According to various embodiments, when the electronic device  910  fails to receive a designated signal through at least one pin provided in the first connector  911  connected to the external electronic device  920 , it may be determined that the power of the power supply  920  is in the OFF state. 
     According to various embodiments, the identification circuit  910  of the electronic device  910  may determine whether the power of the external electronic device  920  is in the ON state or in the OFF state from a signal received via the data communication terminal  911   b  (e.g., the second pin) of the first connector  911 . When it is determined in operation  1403  that the power of the external electronic device is in the ON state, in operation  1405 , the electronic device may be switched to the ON state by the power supplied from the external electronic device. In operation  1407 , the electronic device may receive various data from the external electronic device and may operate preset functions (e.g., functions that operate as the HMD device). According to various embodiments, in operation  1415 , the electronic device may supply power to the external electronic device while operating the preset functions through communication with the external electronic device. 
     When it is determined in operation  1403  that the power of the external electronic device is not in the ON state, the electronic device may be connected to a power supply (e.g., the power supply  930  of  FIGS. 9 to 12 ) via the second connector in operation  1409 , thereby forming the configuration of  FIG. 12 . 
     When the power supply is connected to the second connector of the electronic device, the electronic device may be powered ON by the supplied power in operation  1411 . 
     In operation  1413 , the electronic device may control a switching circuit (e.g., the switching circuit  913  of  FIGS. 10 to 12 ) provided in the electronic device to the ON state. 
     In operation  1415 , as the switching circuit is controlled to be in the ON state, the electronic device may supply power received from the power supply to the external electronic device. Various embodiments may be implemented such that it is possible for the user to select whether power is supplied to the external electronic device from the electronic device using various input interfaces (e.g., touch screen, physical key, etc.) provided in the electronic device. 
     In operation  1407 , when the electronic device determines that the power of the external electronic device is controlled (e.g., control to be turned ON from the OFF state), in operation  1419 , the electronic device may transmit a power control message to the external electronic device. Various embodiments may be implemented such that the user may select whether to control the power of the external electronic device using various input interfaces (e.g., a touch a screen, a physical key, etc.) provided in the electronic device. 
     According to various embodiments, when the power of the external electronic device is in the ON state, a specific power control message (e.g., a message for controlling power to the OFF state from the ON state) may be transmitted to the external electronic device such that the external electronic device can receive power from the electronic device even in the OFF state. 
       FIG. 15  is a signal flowchart illustrating a power control procedure between electronic devices according to various embodiments. Referring to  FIG. 15 , in operation  1501 , the external electronic device  820  (e.g., the external electronic device  920  of  FIGS. 9 to 12 ) may be in the OFF state and in operation  1503 , the electronic device  810  (e.g., the electronic device  910  (e.g., an HMD) of  FIGS. 9 to 12 ) may be in the OFF state. 
     When the power supply (e.g., the power supply  930  of  FIGS. 9 to 12 ) is connected to the second connector of the electronic device in operation  1505 , thereby forming the configuration of  FIG. 10 , the electronic device may be supplied with power from the power supply by a switching circuit connection structure according to an embodiment in operation  1507 , even if the electronic device is in the OFF state. 
     In operation  1509 , the power of the electronic device may be turned ON by the supplied power. 
     When the external electronic device is connected to the first connector of the electronic device in operation  1511  (thereby forming the configuration of  FIG. 12 ), the electronic device may determine whether the power of the external electronic device is in the ON state. 
     According to various embodiments, the method of determining by the electronic device  810  whether the power of the external electronic device  820  is in the ON state may be implemented in various ways. For example, the electronic device  810  may determine the power state of the external electronic device  820  by detecting signal, voltage, and resistance values input through at least one pin provided in the first connector  811  connected to the external electronic device  820 . According to various embodiments, when the electronic device  810  fails to receive a designated signal through at least one pin provided in the first connector  811  connected to the external electronic device  820 , it may be determined that the power of the power supply  820  is in the OFF state. 
     According to various embodiments, the identification circuit  810  of the electronic device  810  may determine whether the power of the external electronic device  820  is in the ON state or in the OFF state from a signal received via the data communication terminal of the first connector  911 . 
     When it is determined that the power of the external electronic device is not in the ON state, the electronic device may control the switching circuit (e.g., the switching circuit  913  of  FIGS. 10 to 12 ) to be in the ON state in operation  1513 . 
     In operation  1515 , as the switching circuit is controlled to be in the ON state, the electronic device may supply power received from the power supply to the external electronic device. In operation  1519 , the external electronic device may operate the boot loader by the power provided via the electronic device. 
     When it is determined to control the power of the external electronic device (e.g., control the power from the OFF state to the ON state), the electronic device may produce a power control message in operation  1521  and may transmit the produced control message to the external electronic device in operation  1523 . 
     The external electronic device may receive the power control message from the electronic device and may switch the power to the ON state according to the received power control message in operation  1525 . In operation  1527 , since the power is in the ON state, the external electronic device is able to transmit/receive data to/from the electronic device. 
     In a method for controlling power between electronic devices, a method of operating an electronic device according to any one of various embodiments may include: determining a connection with an external electronic device via at a first connector including at least one first pin and at least one second pin; determining a connection with a power supply via a second connector including at least one third pin and at least one fourth pin; receiving power from the power supply via the at least one third pin; and supplying the power, which is received from the power supply via the at least one third pin, to the at least one first pin when it is determined that an electronic device is connected to the external electronic device via the first connector and is connected to the power supply via the second connector. 
     According to various embodiments, the method may further include transmitting information related to control of power of the external electronic device via the at least one second pin of the first connector when it is determined that the power of the external electronic device is in an OFF state using the first connector. 
     According to various embodiments, the second connector may support a USB scheme. 
     According to various embodiments, the first connector may support a USB scheme, and the transmitting may include determining that the power of the external electronic device is in an OFF state when a designated signal is not received using the first connector. 
     According to various embodiments, the at least one second pin may include a CC pin. 
     According to various embodiments, the information related to the control of the power may be included in a VDM according to a Power Delivery PD communication standard. 
     According to various embodiments, the electronic device may include a Head-Mounted Display (HMD) device capable of being engaged with the external electronic device. 
       FIG. 16  is a perspective view illustrating a connector and an external connector of an electronic device according to various embodiments. 
     Referring to  FIG. 16 , a connector  1603  (e.g., the connector  201 - 9  of  FIG. 2 ) according to one embodiment may be in the form of a socket, forming the outer face of the connector  1603 , and may include a housing  1603 - 1  having an opening  1603 - 1   a  formed in at least a portion of the outer face thereof so as to be coupled with an external connector  1605  (e.g., the external face  20 - 9  of  FIG. 2 ) in the form of a header. The connector  1603  according to one embodiment may include a substrate  1603 - 5  inside the opening  1603 - 1   a,  and the substrate  1603 - 5  may include a first face  1603 - 5   a  on which a plurality of first pins corresponding to the forward direction are disposed and a second face  1603 - 5   b  on which a plurality of second pins corresponding to the reverse direction are disposed. 
     According to various embodiments, the connector  1603  may further include first and second ratchet pins  1603   a  and  1603   b  that enable electrical or physical connection of the external connector  1605 . According to various embodiments, at least a portion of the first and second ratchet pins  1603   a  and  1603   b  may include a fastening groove to which the external connector  1605  can be fastened. According to one embodiment, the first ratchet pin  1603   a  corresponds to the forward direction, the second ratchet pin  1603   b  corresponds to the reverse direction, and at least one of the first and second ratchet pins  1603   a  and  1603   b  may be selectively connected to wireless communication data. 
       FIGS. 17 and 18  are views for explaining the pins of the connector according to various embodiments. 
     Referring to  FIG. 17 , a connector  1700  (e.g., the connector  178  of  FIG. 1  or the connector  201 - 9  of  FIG. 2 ) according to various embodiments may be a USB type C connector. The connector  1700  may include a plurality of pins. According to various embodiments, the connector  1700  may include a plurality of first pins on a first face (e.g., face A) corresponding to the forward direction and a plurality of second pins on a second face (e.g., face B) corresponding to the reverse direction. For example, the plurality of first pins may include a GND pin  1711   a,  a TX1+ pin  1712   a,  a TX1− pin  1713   a,  a VBUS pin  1714   a,  a CC pin  1715   a,  a Dp1 pin  1716   a,  a Dn1 pin  1717   a,  an SBU1 pin  1718   a,  a VBUS pin  1719   a,  an RX2− pin  1720   a,  an RX2+ pin  1721   a,  and a GND pin  1722   a.  For example, the plurality of second pins may include a GND pin  1711   b,  a TX1+ pin  1712   b,  a TX1− pin  1713   b,  a VBUS pin  1714   b,  a VCONN pin  1715   b,  a Dp1 pin  1716   b,  a Dn1 pin  1717   b,  an SBU1 pin  1718   b,  a VBUS pin  1719   b,  an RX2− pin  1720   b,  an RX2+ pin  1721   b,  and a GND pin  1722   b.    
     According to one embodiment, the plurality of first pins may include one or more first ground pins (e.g., GND pins  1711   a  and  522   a ) and one or more first signal pins (e.g., a TX1+ pin  1712   a,  a TX1− pin  1713   a,  a VBUS pin  1714   a,  a CC pin  1715   a,  a Dp1 pin  1716   a,  a Dn1 pin  1717   a,  an SBU1 pin  1718   a,  a VBUS pin  1719   a,  RX2−  1720   a,  and RX2+  1721   a ), and the plurality of second pins may include one or more second ground pins (e.g., GND pins  1711   b  and  522   b ) and one or more second signal pins (e.g., a TX2+ pin  1712   b,  a TX2− pin  1713   b,  a VBUS pin  1714   b,  a VCONN pin  1715   b,  a Dp1 pin  1716   b,  a Dn1 pin  1717   b,  an SBU2 pin  1718   b,  a VBUS pin  1719   b,  an RX1− pin  1720   b,  and an RX1+ pin  1721   b ). 
     Referring to  FIG. 18 , the TX1+ and TX2+ pins  1712   a  and  512   b  and the TX1− and TX2− pins  1713   a  and  513   b  may be pins for super speed TX capable of fast transmission of data, the Vbus pins  1714   a  and  514   b  may be pins for USB cable charging power, and the CC pin  1715   a  may be a pin serving as an identification terminal. The VCONN pin  1715   b  may be a pin for supporting plug power, the Dp1 pins  1716   a  and  516   b  and the Dn1 pins  1717   a  and  517   b  may be pins for different bidirectional USB signals, the SBU1 and SBU2 pins  1718   a  and  518   b  may be pins that may be used for various signals (e.g., audio signals, display signals, etc.) as extra pins, and the RX2− and RX1− pins  1720   a  and  520   b  and the RX2+ and RX1+ pins  1721   a  and  521   b  may be pins for super speed RX capable of fast reception of data. 
     According to one embodiment, among one or more first signal pins (e.g., the TX1+ pin  1712   a,  the TX1− pin  1713   a,  the VBUS pin  1714   a,  the CC pin  1715   a,  the Dp1 pin  1716   a,  the Dn1 pin  1717   a,  the SBU1 pin  1718   a,  the VBUS pin  1719   a,  the RX2− pin  1720   a,  and RX2+ pin  1721   a ), at least one first signal pin may be selectively connected to a circuit (e.g., an audio module  460 ) associated with a signal of a designated function and a communication circuit (e.g., a broadcast module  470 ) capable of receiving broadcast data, and among one or more second signal pins (e.g., the TX2+ pin  1712   b,  the TX2− pin  1713   b,  the VBUS pin  1714   b,  the VCONN pin  1715   b,  the Dp1 pin  1716   b,  the Dn1 pin  1717   b,  the VBUS pin  1719   b,  the RX1− pin  1720   b,  and the RX1+ pin  1721   b ), at least one second signal pin may be selectively connected to a signal of a designated function (e.g., the audio module  460 ) and a wireless data communication signal (e.g., a broadcast data signal) (e.g., the communication module  470 . 
     According to one embodiment, among the one or more first ground pins (e.g., the GND pins  1711   a  and  522   a ), at least one first ground pin may be selectively connected to the wireless communication data signal (e.g., the communication module  470 ), and among the one or more second ground pins (e.g., the GND pins  1711   b  and  522   b ), at least one second ground pin may be selectively connected to a wireless communication data signal (e.g., the communication module  470 ). 
     It has been described the first and second signal pins and the first and second ground pins are used as the pins that may be selectively connected to wireless communication data signals in the above embodiments as an example. However, according to one embodiment, at least a portion of a latch structure may be designated as a latch pin that may be selectively connected to a wireless communication data signal, and the latch pin may be selectively connected to the wireless communication data signal. 
       FIG. 19  is a block diagram illustrating another exemplary configuration of an exemplary HMD device  1900  according to various embodiments. 
     Referring to  FIG. 19 , the HMD device  1900  may provide a wearer with the same or similar operation as the electronic device described above, independently of the electronic device (e.g., a display device) mounted thereon. The HMD device  1900  may include an MCU  1910 , a communication module  1920 , a sensor module  1930 , an input module  1940 , an eye tracking module  1950 , a vibrating motor  1952 , a focus adjustment module  1954 , a power management module  1960 , a battery  1962 , a display  1970 , and a camera module  1980 . 
     The communication module  1920  may include, for example, a USB module  1921 , a Wi-Fi module  1922 , a BT module  1923 , an NFC module  1924 , and a GPS module  1925 . The sensor module  1930  may include, for example, an acceleration sensor  1931 , a gyro sensor  1932 , an atmospheric sensor  1933 , a magnetic sensor  1934 , an acceleration sensor  1935 , a grip sensor  1936 , a proximity sensor  1937 , an RGB sensor  1938 , and an access sensor  1939 . The input module  1940  may include a touch pad  1941  and a button  1942 . 
     The HMD device  1900  may include a display  1970  that may be fixedly mounted on the body instead of having a structure detachably mounted on an electronic device (e.g., a display device). 
       FIG. 20  is a block diagram  2000  of a program  140  according to various embodiments. According to one embodiment, the program  140  may include an operating system  142  for controlling one or more resources of the electronic device  101 , a middleware  144 , or an application  146  executable on the operating system  142 . The operating system  142  may include, for example, Android™, iOS™, Windows™, Symbian™, Tizen™, or Bada™. At least some of the programs  140  may be, for example, preloaded into the electronic device  101  at the time of manufacture, or downloaded or updated from an external electronic device (e.g., the electronic device  102  or  104  or the server  108 ) in the use environment of the user. 
     The operating system  142  may control (e.g., allocate or recover) system resources (e.g., a process, a memory, or a power source) of the electronic device  101 . The operating system  142  may additionally or alternatively include other hardware devices of the electronic device  101  (e.g., an input device  150 , a sound output device  155 , a display device  160 , an audio module  170 , a sensor module  176 , an interface  177 , a haptic module  179 , a camera module  180 , a power management module  188 , a battery  189 , a communication module  190 , a subscriber identification module  196 , and one or more driver programs for driving an antenna module  197 . 
     The middleware  144  may provide various functions to an application  146  so that the application  146  may use the functions or information provided by the one or more resources of the electronic device  101 . The middleware  144  may include, for example, an application manager  2001 , a window manager  2003 , a multimedia manager  2005 , a resource manager  2007 , a power manager  2009 , a database manager  2011 , a package manager  2013 , a connectivity manager  2015 , a notification manager  2017 , a location manger  2019 , a graphic manager  2021 , a security manager  2023 , a telephony manager  2025 , or a voice recognition manager  2027 . The application manager  2001  may manage, for example, a life cycle of the applications  146 . The window manager  2003  may manage, for example, a GUI resource that is used in a screen. The multimedia manager  2005  may determine, for example, a format required for reproducing various media files, and may perform encoding or decoding of the media files by using a codec that is suitable for the corresponding format. The resource manager  2007  may manage, for example, a source code of the applications  146  or a memory space. The power manager  2009  may manager, for example, a battery capacity, temperature, or power, and may determine or provide power information required for operating the electronic device  101  using the corresponding information. According to one embodiment, the power manager  2009  may be interlocked with a Basic Input/Output System (BIOS). 
     The database manager  2011  may generate, retrieve, or change, for example, a database to be used by the applications  146 . The package manager  2013  may manage, for example, the installation or update of an application that is distributed in the form of a package file. The connectivity manager  2015  may manage, for example, a wireless connection or a wired connection between the electronic device  101  and the external electronic device. The notification manager  2017  may provide, for example, a function for notifying a user of a generated event (e.g., a call, a message, or an alarm). The location manager  2019  may manage, for example, position information of the electronic device  101 . The graphic manager  2021  may manage a graphic effect to be provided to the user or a user interface associated therewith. The security manager  2023  may provide, for example, system security or user authentication. The telephony manager  2025  may manage, for example, a voice call or video call function of the electronic device  101 . The voice recognition manager  2027  may transmit the voice data of the user to the server  108  and may receive a command corresponding to the function to be performed in the electronic device  101  or character data converted on the basis of the corresponding voice data. According to one embodiment, the middleware  2044  may dynamically delete some of the existing components or add new components. According to one embodiment, at least some of middlewares  144  may be included as part of the operating system  142 , or may be implemented as software separate from the operating system  142 . 
     The applications  146  may include, for example, a home application  2051 , a dialer application  2053 , an SMS/MMS application  2055 , an Instant Message (IM) application  2057 , a browser application  2059 , a camera application  2061 , an alarm application  2063 , a contact application  2065 , a voice recognition application  2067 , an e-mail application  2069 , a calendar application  2071 , a media player application  2073 , an album application  2075 , a watch application  2077 , a health application  2079  (e.g., an application for measuring a quantity of motion, or blood sugar), and an environmental information (e.g., atmospheric pressure, humidity, or temperature information) application  2081 . According to one embodiment, the applications  146  may further include an information exchange application (not illustrated) that may support information exchange between the electronic device  101  and the external electronic device. The information exchange application may include, for example, a notification relay application configured to transmit designated information (e.g., a call, a message, or an alarm) to the external electronic devices, or a device management application configured to manage the external electronic devices. The notification relay application may transmit, for example, notification information corresponding to an event (e.g., mail reception) generated in another application (e.g., the email application  2069 ) of the electronic device  101  to an external electronic device, or may receive notification information from an external electronic device and provide the notification information to the user of the electronic device  101 . The device management application may control, for example, the power (e.g., turn-on or turn-off) of an external electronic device that communicates with the electronic device  101  or some of its components (e.g., the display device  160  or the camera module  180 ) or a function (e.g., brightness, resolution, or focus of the display device  160  or the camera module  180 ). The device management application may additionally or alternatively support the installation, deletion, or update of an application executed in an external electronic device. 
       FIG. 21  is a flowchart illustrating a procedure of power of an external electronic device from an electronic device according to various embodiments. Referring to  FIG. 21 , in operation  2101 , the electronic device (the electronic device  910  of  FIGS. 9 to 12  (e.g., an HMD) may determine whether it is connected to an external electronic device (e.g., the external electronic device  920  of  FIGS. 9 to 12 ) via the first connector (e.g., the first connector  911  of  FIG. 9 ). According to various embodiments, the first connector may include a power supply terminal (e.g., the power supply terminal  911   a  of  FIG. 9 ) for power supply or reception, a data communication terminal (e.g., the data communication terminal  911   b  of  FIG. 9 ) and/or a ground terminal (not illustrated) for data communication with an external electronic device. The power supply terminal  911   a  may be referred to as a first pin, and the data communication terminal  911   b  may be referred to as a second pin. According to various embodiments, the first pin or the second pin may be configured with one pin or a plurality of pins. 
     According to various embodiments, the first connector may have a USB connector specification. In this case, the power supply terminal may correspond to the VBUS terminal of the USB connector, and the data communication terminal may correspond to D+ and D− terminals or Tx and Rx terminals. 
     In operation  2103 , the electronic device may determine whether it is connected to a power supply (e.g., the power supply  930  of  FIG. 9 ) via a second connector (e.g., the second connector  912  of  FIG. 9 ). According to various embodiments, the second connector may include a power supply terminal (e.g., the power supply terminal  912   a  of  FIG. 9 ) for power supply or reception, a data communication terminal (e.g., the data communication terminal  912   b  of  FIG. 9 ) for data communication with an external electronic device and/or a ground terminal (not illustrated). The power supply terminal may be referred to as a third pin, and the data communication terminal may be referred to as a fourth pin. According to various embodiments, the third pin or the fourth pin may be configured with one pin or a plurality of pins. 
     In operation  2105 , the electronic device may receive power from the power supply via the second connector (e.g., the power supply terminal (third pin) of the second connector). When the electronic device is connected to the external electronic device and the power supply, in operation  2107 , the electronic device may transmit the power received from the power supply to the external electronic device via the first connector (e.g., the power supply terminal (first pin) of the first connector). 
     The above described components of the electronic device according to various embodiments may be formed of one or more components, and a name of a corresponding component element may be changed based on the type of electronic device. The electronic device according to various embodiments may include at least one of the aforementioned elements. Some elements may be omitted or other additional elements may be further included in the electronic device. Also, some of the hardware components according to various embodiments may be combined into one entity, which may perform functions identical to those of the relevant components before the combination. 
     The term “module” as used herein may, for example, mean a unit including one of hardware, software, and firmware or a combination of two or more of them. The “module” may be interchangeably used with, for example, the term “unit”, “logic”, “logical block”, “component”, or “circuit”. The “module” may be a minimum unit of an integrated component element or a part thereof. The “module” may be a minimum unit for performing one or more functions or a part thereof. The “module” may be mechanically or electronically implemented. For example, the “module” according to the present disclosure may include at least one of an Application-Specific Integrated Circuit (ASIC) chip, a Field-Programmable Gate Arrays (FPGA), and a programmable-logic device for performing operations which has been known or are to be developed hereinafter. 
     According to various embodiments, at least some of the devices (for example, modules or functions thereof) or the method (for example, operations) according to the present disclosure may be implemented by a command stored in a computer-readable storage medium in a programming module form. The instruction, when executed by a processor (e.g., the processor  120 ), may cause the one or more processors to execute the function corresponding to the instruction. The computer-readable storage medium may, for example, be the memory  130 . 
     The computer readable recoding medium may include a hard disk, a floppy disk, magnetic media (e.g., a magnetic tape), optical media (e.g., a Compact Disc Read Only Memory (CD-ROM) and a Digital Versatile Disc (DVD)), magneto-optical media (e.g., a floptical disk), a hardware device (e.g., a Read Only Memory (ROM), a Random Access Memory (RAM), a flash memory), and the like. In addition, the program instructions may include high class language codes, which can be executed in a computer by using an interpreter, as well as machine codes made by a compiler. The aforementioned hardware device may be configured to operate as one or more software modules in order to perform the operation, and vice versa. 
     The programming module according to the present disclosure may include one or more of the aforementioned components or may further include other additional components, or some of the aforementioned components may be omitted. Operations executed by a module, a programming module, or other component elements according to various embodiments may be executed sequentially, in parallel, repeatedly, or in a heuristic manner. Furthermore, some operations may be executed in a different order or may be omitted, or other operations may be added. 
     According to various embodiments, in a storage medium storing commands, the commands are set to cause at least one processor to perform at least one operation when executed by the at least one processor. In a method for controlling power between electronic devices, the at least one operation may include: determining a connection with an external electronic device via at a first connector including at least one first pin and at least one second pin; determining a connection with a power supply via a second connector including at least one third pin and at least one fourth pin; receiving power from the power supply via the at least one third pin; and supplying the power, which is received from the power supply via the at least one third pin, to the at least one first pin when it is determined that an electronic device is connected to the external electronic device via the first connector and is connected to the power supply via the second connector. 
     Various embodiments disclosed herein are provided merely to easily describe technical details of the present disclosure and to help the understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. Accordingly, the scope of the present disclosure should be construed as including all modifications or various other embodiments based on the technical idea of the present disclosure.