Apparatus and method for controlling current consumption of mobile terminal

Disclosed is an apparatus and method for controlling current consumption of a mobile device. The method includes measuring weather in an environment of the mobile device and comparing the measured value with an operating threshold. When the measured value is out of the operating range, current consumed by the mobile device is controlled.

PRIORITY

This application claims priority under 35 U.S.C. §119(a) to Korean Application Serial No. 10-2012-0136593, filed in the Korean Intellectual Property Office on Nov. 28, 2012, the entire content of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention generally relates to a mobile terminal, and more particularly, to an apparatus and method for controlling current consumption of a mobile terminal.

2. Description of the Related Art

In general, a smart phone refers to a terminal that combines advantages of a mobile communication terminal, i.e., a personal communication services terminal, and a Personal Digital Assistant (PDA) terminal, and incorporates data communication functions, such as schedule management, still image photographing, moving image photographing, facsimile transmission/reception, and Internet access, with the mobile communication terminal functions, such as voice call-related functions.

In addition, a terminal with a camera module that includes mobile communication capability, e.g., a Samsung Galaxy Camera, that mainly serves to photograph images, but also includes mobile communication capability as a main function is referred to as a mobile terminal, with the mobile communication module having a built-in camera also is referred to as a mobile terminal.

As the performance of such a mobile terminal improves, applications adapted to the mobile terminal's operating system rapidly increase, and the functions of the mobile terminal increase. Due to these various applications and functions, the amount of current consumed by a mobile terminal is on an increasing trend, and technologies for reducing this current consumption have been developed.

In a conventional mobile terminal, however, a greater voltage drop occurs at low temperature than at room temperature when current consumption is rapidly increased. Therefore, a problem arises in that, despite a battery of a mobile terminal being sufficiently charged, the battery cannot normally provide the mobile terminal with sufficient current, and thus the mobile terminal can power off or malfunction. In particular, a mobile terminal with a camera module having a lens barrel unit will frequently cause such problems because current consumption rapidly increases as the lens barrel unit moves, in particular at the initialization of the camera module.

SUMMARY OF THE INVENTION

Aspects of embodiments of the present invention are to at least partially solve, alleviate, or remove at least one of the problems and/or disadvantages related to the prior art.

To solve the above problems occurring in conventional devices, an aspect of the present invention provides an apparatus and method for controlling current consumption of a mobile terminal.

Further, to solve the above problems of conventional devices, another aspect of the present invention provides an apparatus and method for controlling current consumption of a mobile terminal, which eliminates inconvenience in using the mobile terminal by controlling current supplied to constituent elements that have large current consumption upon an instantaneous voltage drop of the mobile terminal.

In accordance with an aspect of the present invention, a method of controlling current consumption of a mobile terminal is provided that includes measuring weather in an environment of the mobile terminal and controlling current consumed by the mobile terminal, based on a result of the measuring.

In accordance with another aspect of the present invention, a method of controlling current consumption of a mobile terminal is provided. The method includes measuring weather in an environment of the mobile terminal upon one of a boot-up operation of the mobile terminal and activation of a photographing operation of the mobile terminal; and reducing current consumed by the mobile terminal by restricting a specific module of the mobile terminal from operating, based on a result of the measuring.

In accordance with yet another aspect of the present invention, an apparatus for controlling current consumption of a mobile terminal is provided. The apparatus includes a sensor that measures weather in an environment of the mobile terminal upon one of a boot-up operation of the mobile terminal and activation of a photographing operation of the mobile terminal; and a controller that reduces current consumed by the mobile terminal by restricting a specific module of the mobile terminal from operating, based on the weather measured by the sensor.

The present invention will now be described more fully with reference to the accompanying drawings in which some particular embodiments are shown, but the present invention may have various embodiments and changes may be made therein. Therefore, it should be understood that there is no intent to limit the present invention to the particular embodiments disclosed, but the present invention should be construed to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

While terms including ordinal numbers, such as “first” and “second,” etc., may be used to describe various components, such components are not limited by the above terms. The above terms are used merely for the purpose of distinguishing an element from another. For example, a first element may be termed a second element, and likewise a second element may be termed a first element without departing from the scope of the present invention. As used herein, the term “and/or” encompasses any one or combination of plural relevant items.

The terms used herein are merely for the purpose of describing particular embodiments and are not intended to limit the present invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms such as “include” and/or “have” may be construed to denote a certain characteristic, number, step, operation, constituent element, component or a combination thereof, but may not be construed to exclude the existence of or a possibility of addition of one or more other characteristics, numbers, steps, operations, constituent elements, components or combinations thereof.

Unless defined otherwise, all terms used herein, including technical terms and scientific terms, have the same meaning as commonly understood by those of skill in the art. Such terms as those defined in a generally used dictionary are to be interpreted to have the meanings equal to the contextual meanings in the relevant field of art, and are not to be interpreted to have ideal or excessively formal meanings unless clearly defined in the present specification. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Hereinafter, an operational principle for embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention unclear. The terms which will be described below are terms defined in consideration of the functions in the present invention, and may be different according to users, intentions of the users, or customs. Therefore, their definition will be made based on the overall contents of this specification.

FIG. 1is a block diagram illustrating a mobile terminal according to an embodiment of the present invention.

First, it should be noted that the present invention may be applied to not only a camera module that is built-in to a mobile phone or smart phone, but also a mobile communication module that is built-in to a portable camera, e.g., Samsung Galaxy Camera.

As shown inFIG. 1, a mobile terminal100may be connected to an external device (not shown) by using an external device connection unit, such as a sub communication module130, a connector165, and an earphone connecting jack167. The external device may include various devices attached to or detached from the mobile terminal100and connected thereto by a cable, such as an earphone, an external speaker, a Universal Serial Bus (USB) memory, a charger, a cradle/dock, a mobile payment-related device, a health management device (blood glucose meter, etc.), a gaming machine, a car navigation device, and the like. Further, the external device may include one of a short range communication device, such as a Bluetooth communication device, a Near Field Communication (NFC) device, or a WiFi Direct communication device, which can be wirelessly connected to the mobile terminal100through short range communication, and a wireless Access Point (AP). Further, the external device may include one of another mobile terminal, a mobile phone, a smart phone, a tablet PC, a desktop PC, and a server.

The mobile terminal100may be a smart phone, a camera, a camera with a built-in communication module for providing voice communication, video communication, and data communication to the camera, a mobile phone, a gaming machine, a TV, a display device, a vehicle head unit, a notebook PC, a laptop PC, a tablet PC, a Personal Media Player (PMP), a Personal Digital Assistant PDA), or the like. Further, the mobile terminal100may be implemented as a portable camera with a wireless communication function.

Referring toFIG. 1, the mobile terminal100includes a touch screen190and a touch screen controller195. Further, the mobile terminal100includes a controller110, a mobile communication module120, a sub communication module130, a multimedia module140, a camera module150, a Global Positioning System (GPS) module155, an input/output module160, a sensor module170, a memory175, and a power supply180. The sub communication module130includes at least one of a wireless LAN module131and a short range communication module132, and the multimedia module140includes at least one of a broadcasting communication module141, an audio playback module142, and a video playback module143. The camera module150includes at least one of a first camera151and a second camera152, and the input/output module160includes at least one of a button161, a microphone162, a speaker163, a vibration motor164, a connector165, a keypad166, and an earphone connecting jack167.

The controller110includes a Central Processing Unit (CPU)111, a Read Only Memory (ROM)112storing a control program for controlling the mobile terminal100, and a Random Access Memory (RAM)113storing a signal or data input from outside of the mobile terminal100or used as a memory area for tasks performed in the mobile terminal100. The CPU111may include a single core, a dual core, a triple core, or a quad core. The CPU111, the ROM112, and the RAM113may be connected to each other through an internal bus.

The controller110may control the mobile communication module120, the sub communication module130, the multimedia module140, the camera module150, the GPS module155, the input/output module160, the sensor module170, the memory175, the power supply180, the touch screen190, and the touch screen controller195.

The mobile communication module120, the sub communication module130, and the broadcasting communication module141of the multimedia module140may be collectively called a communication unit, and the communication unit is provided for a direct connection to an external device or a connection to an external device through a network and may be a wired or wireless communication unit. The communication unit may transmit data output from the controller110, the memory175, and the camera module150, by a cable or wirelessly, or receive data by hard wired external communication, i.e., by a cable, or wirelessly, and transmit the received data to the controller110or store the received data in the memory175.

Under the control of the controller110, the mobile communication module120may allow the mobile terminal100to be connected to an external device through mobile communication by using at least one antenna (not shown). The mobile communication module120may transmit/receive a wireless signal for exchange, unidirectional transmission, or unidirectional reception of data, such as a voice call, a video call, a Short Message Service (SMS) message, or a Multimedia Message Service (MMS) message, to/from a mobile phone, a smart phone, a tablet PC, or another device having a phone number input into the mobile terminal100or a network address.

The sub communication module130may include at least one of the wireless LAN module131and the short range communication module132. As an example, the sub communication module130may include only the wireless LAN module131, only the short range communication module132, or both the wireless LAN module131and the short range communication module132.

Under the control of the controller110, the wireless LAN module131may be connected to the Internet in a place where a wireless AP is installed. The wireless LAN module131may support the wireless LAN standard, e.g., IEEE 802.11x of the Institute of Electrical and Electronic Engineers. Under the control of the controller110, the short range communication module132may perform short range wireless communication between the mobile terminal100and an image forming device. The short range wireless communication may include Bluetooth™, Infrared Data Association (IrDA), WiFi-Direct communication, Near Field Communication (NFC), and the like.

The mobile terminal100may include at least one of the mobile communication module120, the wireless LAN module131, and the short range communication module132, depending on its capability. As an example, the mobile terminal100may include a combination of the mobile communication module120, the wireless LAN module131, and the short range communication module132, depending on its capability.

The multimedia module140may include the broadcasting communication module141, the audio playback module142, or the video playback module143. Under the control of the controller110, the broadcasting communication module141may receive a broadcasting signal, e.g., a TV broadcasting signal, a radio broadcasting signal, or a data broadcasting signal, and broadcasting supplement information, e.g., Electric Program Guide (EPG) or Electric Service Guide (ESG), transmitted from a broadcasting station, through a broadcasting communication antenna. Under the control of the controller110, the audio playback module142may play back a stored or received digital audio file, e.g., a file having a file extension of mp3, wma, ogg, or way. Under the control of the controller110, the video playback module143may play back a stored or received digital video file, e.g., a file having a file extension of mpeg, mpg, mp4, avi, mov, or mkv, through the touch screen190.

The multimedia module140may include only the audio playback module142and the video playback module143, excluding the broadcasting communication module141. Further, the audio playback module142and/or the video playback module143of the multimedia module140may be included in the controller110.

The camera module150may include at least one of the first camera151and the second camera152for photographing a still image or a moving image under the control of the controller110. Further, the camera module150may include a lens barrel unit (FIGS. 2-3) that provides a zoom function, and the first camera151or the second camera152may include an auxiliary light source, e.g., a flash, that provides light required for photographing. The first camera151may be disposed on the front surface of the mobile terminal100, and the second camera152may be disposed on the back surface of the mobile terminal100. Alternatively, the first camera151and the second camera152may be disposed adjacent to each other, preferably with an interval between the first camera151and the second camera152being greater than 1 cm and smaller than 8 cm, to photograph a three-dimensional still or moving image. Such a camera module including a barrel-type lens is described in detail with reference toFIGS. 2-3. Each of the first and second cameras151and152of the camera module150may include a lens system, an image sensor, a flash, and the like. Each of the first and second cameras151and152may convert an optical signal input, i.e., photographed, through the lens system into an image signal and output the converted image signal to the controller110, and a user may photograph a still or moving image through the first and second cameras151and152.

The lens system allows external incident light to converge on the focus and thereby form an image of a subject. The lens system may include at least one lens, and each lens may be a convex lens, an aspheric lens, or the like. The lens system is symmetric with respect to an optical axis that passes the center of the lens system and thus is defined as the central axis. The image sensor detects an optical image, formed by external light incident through the lens system, as an electrical image signal. The image sensor may include a plurality of pixel units arranged in an M×N matrix structure, and each of the pixel units may include a photodiode and a plurality of transistors. The pixel units accumulate electric charges generated by the incident light, and the voltage induced by the accumulated electric charges represents the intensity of the incident light. In processing one image that constitutes a still or moving image, an image signal output from the image sensor may consist of a set of voltages, i.e., pixel values, output from the pixel units, and the image signal represents one frame, i.e., a still image, that may include M×N pixels. As the image sensor, for example, a Charge-Coupled Device (CCD) image sensor, a Complementary Metal-Oxide Semiconductor (CMOS) image sensor, or the like may be used.

A drive unit may drive the image sensor under the control of the control unit110. The drive unit may operate all the pixels or only the pixels located in a region of interest among the pixels of the image sensor, depending on a control signal received from the controller110, and image data output from the pixels is output to the controller110.

The controller110processes an image input from each of the first and second cameras151and152or stored in the memory175in units of frames and outputs an image frame, which is converted to be suitable for screen characteristics (size, picture quality, resolution, etc.) of the touch screen190, to the touch screen190. Further, the controller110may detect movements of the mobile terminal100created by a user's movements and movements of a transportation means, such as when the user rides on the transportation means, including a bus, subway, taxi, or the like, by using the location of the mobile terminal or the transportation means and the velocities of the movements.

The GPS module155may receive radio waves from a plurality of GPS satellites to calculate a location of the mobile terminal100, i.e., a location of a user carrying the mobile terminal, by using the Time Of Arrival (TOA) from each of the GPS satellites to the mobile terminal100. Although only the GPS module is shown and described in the specification, this is merely one example, and the mobile terminal100may include a WiFi Positioning System (WPS) together with the GPS module155or may include at least one of the GPS module and the WPS module.

The input/output module160may include at least one of the button161, the microphone162, the speaker163, the vibration motor164, the connector165, the keypad166, and the earphone connecting jack167. Except for the connector165, the input/output module160is used to receive a user input or inform a user of any information, and as other examples of the input/output module160, a mouse, a trackball, a joystick, or a cursor control such as cursor direction keys may be provided to perform information communication with the controller110and control movements of the cursor on the touch screen190, but the present is not limited thereto.

The button161may be formed on the front surface, side surface, or back surface of the mobile terminal100, and may include at least one of a power/lock button, a volume button including a volume up button and a volume down button, a menu button, a home button, a back button, and a search button.

Under the control of the controller110, the microphone162may receive a voice or sound from a user or the ambient environment and generate the received voice or sound into an electrical signal.

Under the control of the controller110, the speaker163may output sounds corresponding to various signals, e.g., a wireless signal, a broadcasting signal, a digital audio file, a digital video file, image photographing, etc., from the mobile communication module120, the sub communication module130, the multimedia module140, or the camera module150to the outside of the mobile terminal100. The speaker163may output a sound, e.g., a button operation tone or ring back tone corresponding to a phone call, corresponding to a function performed by the mobile terminal100. One or more speakers163may be formed in an appropriate position or appropriate positions of the mobile terminal100.

Under the control of the controller110, the vibration motor164may convert an electrical signal to a mechanical vibration. As an example, when the mobile terminal100that is in a vibration mode receives a voice or video call from an external device, the vibration motor164is operated. One or more vibration motors may be formed within the mobile apparatus100. The vibration motor may be operated in response to a touch action of a user on the touch screen190or a continuous touch movement on the touch screen190.

The connector165may be used as an interface for connecting the mobile terminal100to an external device or a power source. Under the control of the controller110, the mobile terminal100may transmit data stored in the memory175of the mobile terminal100to the external device or receive data from the external device through a wired cable connected to the connector165. Also, the mobile terminal100may receive power from an external power source or charge a battery using the power source through a wired cable connected to the connector165.

The keypad166may receive a key input for the control of the mobile terminal100from a user. The keypad166may include a physical keypad formed in the mobile terminal100or a virtual keypad displayed on the touch screen190. The physical keypad formed in the mobile terminal100may be omitted according to the capability or structure of the mobile terminal100.

An earphone may be inserted into the earphone connecting jack167to be connected to mobile terminal100.

The sensor module170may include at least one sensor for detecting a state, i.e., position, direction, motion, etc., of the mobile terminal100. Further, the sensor module170may include a sensor for sensing ambient temperature, humidity, color, or the like in an environment of mobile terminal100. As an example, the sensor module170may include a proximity sensor for detecting whether a user approaches the mobile terminal100, a light sensor for detecting the amount of ambient light of the mobile terminal100, a motion/direction sensor for detecting motion, e.g., rotation, acceleration, deceleration, or vibration, of the mobile terminal100, an altimeter for measuring altitude, a manometer for measuring atmospheric pressure, a thermometer for measuring atmospheric temperature, and a hygrometer for measuring atmospheric humidity. Further, the motion/direction sensor may include an acceleration sensor, a geo-magnetic sensor for detecting the point of the compass of the mobile terminal100by using the Earth's magnetic field, a gravity sensor for detecting the direction of gravity action, a gyro sensor, an impact sensor, a compass sensor, and the like. The sensor module170may detect a state of the mobile terminal100, generate a signal corresponding to the detection, and transmit the generated signal to the controller110. The sensors of the sensor module170may be added or omitted depending on the capability of the mobile terminal100.

Under the control of the controller110, the memory175may store a signal or data input/output into/from the mobile communication module120, the sub communication module130, the multimedia module140, the camera module150, the GPS module155, the input/output module160, the sensor module170, or the touch screen190. The memory175may store control programs and applications for controlling the mobile terminal100or the controller110.

The term “memory” encompasses any type of data storage device such as the memory175, the ROM112and the RAM113within the controller110, and a memory card, e.g., an SD card or a memory stick, mounted in the mobile terminal100.

Further, the memory175may store images for providing applications having various functions, such as navigation, video communication, gaming, and time-based alarming for a user, and Graphical User Interfaces (GUIs) related thereto, databases or data related to processing of user information, documents, and touch inputs, background images e.g., menu screens, standby screens, etc., to drive the mobile terminal100, operating programs, images photographed by the camera module150, and the like. The memory175is a machine (e.g., computer)-readable medium, and the term “machine-readable medium” may be defined as a non-transitory medium for providing data to a machine so as for the machine to perform a specific function. The machine-readable medium may be a storage medium. The memory175may include a non-volatile medium and a volatile medium. All such media should be of a type in which commands transferred by the media can be detected by a physical mechanism that reads the commands into a machine.

The machine-readable media include, but not limited to, at least one of a floppy disc, a flexible disc, a hard disc, a magnetic tape, a Compact Disc ROM (CD-ROM), an optical disc, a punch card, a paper tape, a RAM, a Programmable ROM (PROM), an Erasable PROM (EPROM), and a Flash EPROM (FEPROM).

The respective modules of the mobile terminal according to the present invention have the above-mentioned functions, and a detailed description will be given below of an apparatus and method for allowing the respective modules of the mobile terminal to be normally operated by detecting temperature in the mobile terminal and controlling the current consumed by the respective modules of the mobile terminal, depending on the detected temperature.

FIG. 2is an external perspective view of the mobile terminal showing a built-in camera according to an embodiment of the present invention.

As shown inFIG. 2, a built-in camera200is provided that includes a camera main body210, a lens barrel unit220that adjusts a zoom level so as to take a close up or take a long shot of a subject and also serves as the lens barrel of the camera200, an optical element230that is a lens for imaging a subject and is provided in the lens barrel unit220, a shutter control240, a flash250, and a sensor unit260that senses ambient temperature, humidity, and pressure, including atmospheric pressure.

The sensor unit260may be formed on one side of the outside of the mobile terminal or inside of the mobile terminal.

FIG. 3is a block diagram illustrating an apparatus for controlling current consumption in a mobile terminal according to an embodiment of the present invention.

As shown inFIG. 3, the apparatus includes a sensor unit320to measure temperature and the like to control current consumption in a mobile terminal that includes a built-in camera that includes a camera module310including a lens311for photographing a subject, a lens barrel unit312for adjusting zoom of the lens, and a flash313for providing a light source for photographing. The sensor unit320is provided for measuring weather including ambient temperature, humidity, and pressure, including atmospheric pressure. Display340is provided for displaying a to-be-photographed subject in order to photograph the subject, displaying a photographed subject, and displaying various applications and the measured temperature, humidity, and pressure. Memory350stores a photographed image of a subject and the measured temperature, humidity, and pressure values. Controller330controls the operation of the mobile terminal and camera, and controls the current consumed by respective elements and a clock rate by using values sensed by the sensor unit320. Power source, e.g., battery,360supplies power to operate functions and applications of the mobile terminal.

AlthoughFIG. 3schematically illustrates the apparatus as including sensor unit320for measuring temperature and other external parameters to control current consumption in a mobile communication function built-in camera, it is apparent that the apparatus is briefly illustrated merely for the convenience of description and the respective blocks ofFIG. 3may perform functions that are performed in the corresponding blocks shown inFIG. 1. In addition, it is also apparent that the apparatus for controlling current consumption according to the present invention may be applied to a camera that is built-in to a mobile terminal, as well as a mobile communication terminal having a built-in camera.

As an example, the memory350may store images for providing applications having various functions, such as navigation, a video phone call, and gaming, and GUIs related thereto, databases or data related to a method of processing user information, documents, and touch inputs, background images or operating programs required to drive the mobile terminal, and the like. Further, the memory350stores data regarding weather measured by the sensor unit320.

The camera module310includes at least one camera that photographs a still or moving image under the control of the controller330, a lens311, a lens barrel unit312that zooms in/out the lens for photographing, a flash313that provides light required to photograph an image, and a motor that operates the lens barrel unit.

The sensor unit320measures weather including at least one of the temperature, humidity, and pressure, including atmospheric pressure of in an environment, i.e., a place or location, where the mobile terminal is located and transmits the measured value to the controller330. Further, the sensor unit320measures weather in an environment of, i.e., around, the mobile terminal when the mobile terminal is booted up and/or when the photographing operation provided in the mobile terminal is activated.

The controller330may include more than one core, with a dual core referring to a controller including two cores, and a quad core refers to a controller including four cores. In this way, the controller330may include a plurality of cores. Further, when it is determined that the ambient temperature measured by the sensor unit320is outside of a threshold range, the controller330determines that an instantaneous voltage drop may occur in the power source360, and may reduce current consumption according to the present invention. Further, the controller330may not only control the lens barrel unit312provided in the camera module310, but may also control the current consumed by the lens barrel unit312. Furthermore, the controller330controls the current consumed by the respective modules of the mobile terminal, e.g., by adjusting the brightness of the display, and compares a measured value from the sensor unit320with a predetermined threshold value or determines whether a measured value is within or out of an operating range. In addition, when a measured value is less than the predetermined threshold value or is not within the operating range, the controller330reduces current consumption by restricting the clock rate of the cores or switching a certain number of cores to a deactivation mode for a predetermined period of time. The predetermined period of time is variable and may be set by the manufacturer of the mobile terminal. As described above, when weather measured by the sensor unit320is out of the threshold range, the controller330reduces the current consumed by the mobile terminal by restricting the clock rate to a predetermined clock rate or switching at least one of a plurality of cores to the deactivation mode before and/or during initialization of the mobile terminal.

In this way, the controller330reduces the clock rate or switches at least one core to the deactivation mode, thereby controlling current consumption such that the maximum value of instantaneous current consumption does not exceed the maximum current available from the power source360. That is, the controller330reduces the current consumed by an element, i.e., a constituent element, that has a highest instantaneous current consumption among the elements included in the mobile terminal. Otherwise, the controller330reduces the current consumed by the controller itself by reducing its clock rate and the number of operating cores or switching at least one or more of a plurality of cores included therein to the deactivation mode for a predetermined period of time. As an example, the controller330reduces current consumption by reducing its clock rate from 1.5 GHz to 0.5 GHz or reducing the number of operating cores among cores included therein. In this way, since the value of current consumption is temporarily lowered by temporarily reducing the clock rate and the number of operating cores that contribute to high instantaneous current consumption or temporarily switching a certain number of cores to the deactivation mode, the reduced clock rate will be normally recovered as the deactivated cores are switched to an activation mode after a predetermined period of time, and booting up the mobile terminal or activating the photographing operation through the mobile terminal is not impeded. The operating range is a range required to boot up the mobile terminal and activate the photographing operation, and the operating range is differently set depending on the temperature, humidity, and pressure.

Subsequently, if the current consumed by the mobile terminal is reduced, then the controller330initializes the mobile terminal by activating at least one of the boot-up operation and the photographing operation of the mobile terminal. That is, the mobile terminal stops a series of steps of controlling current consumption and boots up the mobile terminal or activates the photographing operation. This initialization further includes completion of hand-shake correction block initialization and then zoom lens initialization. The zoom lens initialization refers to a step of performing zoom in/out. Further, the shutter is opened, the iris diaphragm is opened, and then the auto focus function is performed. Each of these steps is referred to as the initialization process.

FIG. 4is a flowchart illustrating a method of measuring temperature to control current consumption in a mobile terminal according to an embodiment of the present invention.

Hereinafter, the method of measuring temperature, particularly temperature in an environment of the mobile terminal, to control current consumption in a mobile terminal according to an embodiment of the present invention will be described in detail with reference toFIG. 4.

If the mobile terminal is booted up or the photographing operation of the mobile terminal is activated through the camera module of the mobile terminal, then weather including at least one of the temperature, humidity, and pressure, including atmospheric pressure of an environment where the mobile terminal is located is measured in steps S410and S412. This temperature, humidity, and pressure, including atmospheric pressure, are measured by the sensor unit320.

Upon completion of the temperature measurement, the measured temperature is compared with the operating range in step S414. The operating range is a range of appropriate values for driving the mobile terminal. That is, a camera module provided in a mobile terminal or a camera equipped with a mobile communication module may not be operated because it is not normally supplied with power from the power source360at or below/above an appropriate temperature. As an example, a conventional camera module may not be normally supplied with power because the voltage of the power source is rapidly lowered at or below an outside temperature of 0° C. The present invention is intended to normally activate the camera module to photograph a subject even at or below an outside temperature of 0° C.

When the measured temperature is determined to be out of the operating range in step S416, the clock rate and the number of operating cores of the mobile terminal are temporarily restricted for a predetermined period of time in step S418. The clock rate operates the constituent elements included in the mobile terminal, and information may be transmitted/received at the clock rate. Further, for a mobile terminal having a plurality of cores, with each core consuming current while being operated, when the measured weather is out of the operating range, the controller reduces the current consumed by switching at least one core to the deactivation mode for a predetermined period of time. For a quad-core CPU that consumes 400 mA in a fully activated mode, current consumption can be reduced to 100 mA by deactivating three of the four cores. The lowered clock rate is restored to the original clock rate and the deactivated cores are reactivated after the predetermined period of time.

Further, when the mobile terminal is booted up or the photographing operation is activated, the camera is generally initialized at the maximum clock rate all cores may be activated, which may cause instantaneously consumed current to increase to a maximum value. In the mobile terminal having such a structure, current consumption can be reduced by temporarily restricting the clock rate or reducing the number of operating cores when the measured temperature is less than a threshold value. When the mobile terminal is booted up or the photographing operation is activated, the lens barrel unit312performs a zoom operation in which zoom in/out is achieved. In this situation, the sum of the current consumed by the lens barrel unit312, the current consumed by the quad core, and the current consumed by the other modules of the mobile terminal may instantaneously exceed the current available from the power source360.

As an example, the current available from the power source360is generally 2 A, while a current of about 700 mA is consumed by the zoom in/out operation of the lens barrel unit, a current of about 700 mA is also consumed by the operation of the quad core, and a current of 600 mA or greater is further consumed by the other modules of the mobile terminal. When the total current consumed by the mobile terminal instantaneously exceeds the current available from the power source, the mobile terminal may not boot up, the photographing operation may not be activated, and the mobile terminal may unexpectedly power down.

In order to prevent such abnormal powering down of the mobile terminal caused by instantaneous current consumption exceeding the current available from the power source, the present invention reduces the instantaneous current consumption by measuring temperature around the mobile terminal and restricting the clock rate and the number of operating cores when the measured temperature is less than a threshold value of the operating range.

Subsequently, camera initialization is performed by the boot-up of the mobile terminal or for the photographing of a subject through the activated photographing operation in step S420. That is, once the current is controlled, the mobile terminal is initialized by booting up the mobile terminal and/or activating the photographing operation.

As described above, the present invention provides an apparatus and method for controlling current consumption of a mobile terminal, by which current can be normally supplied to the mobile terminal without a voltage drop even when weather in the environment around the mobile terminal is suddenly changed or the ambient temperature of the mobile terminal is lowered.

It will be appreciated that embodiments of the present invention may be implemented in non-transitory software, hardware, or a combination thereof. Any such software may be stored, for example, in a volatile or non-volatile storage device such as a ROM, a memory such as a RAM, a memory chip, a memory device, or a memory IC, or an optically or magnetically recordable and machine (e.g., computer)-readable storage medium such as a CD, a DVD, a magnetic disk, or a magnetic tape, regardless of its ability to be erased or re-recorded. It will be understood that a memory which may be included in the mobile terminal corresponds to an example of machine-readable storage media suitable to store a program or programs including instructions by which embodiments of the present invention are implemented. Therefore, embodiments of the present invention include a program including codes for implementing an apparatus or method claimed in any one of the accompanying claims and a machine-readable medium for storing such a program. Further, such a program as described above may be electronically transferred through any medium such as a communication signal transmitted through a cable or wireless connection, and the present invention appropriately includes equivalents thereof.

Further, the mobile terminal may receive and store the program from a program providing device connected thereto in a wired or wireless manner. The program providing device may include a memory for storing a program including instructions, which allows the mobile terminal to perform a predetermined content protecting method, and information required for the content protecting method, a communication unit for performing wired or wireless communication with the mobile terminal, and a controller for transmitting the corresponding program to the host device at the request of the mobile terminal or automatically.

Although specific embodiments have been described in the detailed description of the present invention, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined as being limited to the above-described embodiments, but should be defined by the appended claims and equivalents thereof.