Abstract:
A wireless charging apparatus and system according to an embodiment of the present invention provides a wireless charging service through authentication so as to efficiently control charging rights with respect to a plurality of electronic devices, which desire to receive the wireless charging service using a shared wireless charging apparatus, resulting in allowing a user to get a stable wireless charging service and proposing a new benefit creation model. The wireless charging apparatus according to an embodiment of the present invention includes a wireless communication unit configured to receive authentication result information relating to a target electronic device from a server, and a wireless charging unit configured to wirelessly transmit power to the target electronic device if the authentication result information indicates a successful authentication, wherein the wireless communication unit transmits the authentication result information to the target electronic device if the authentication result information indicates an unsuccessful authentication.

Description:
This application claims the benefit of Korean Patent Application No. 10-2011-0038424, filed on Apr. 25, 2011, which is hereby incorporated by reference for all purposes as if fully set forth herein. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This specification relates to an electronic device, and particularly, to a wireless charging apparatus and system. 
     2. Background of the Invention 
     As portability is required more and more for various electronic devices belonging to users, importance of battery efficiency is gradually increasing. Accordingly, various approaches to make the battery highly efficient have been introduced. However, further progress in battery charging has not been made in spite of those approaches or attempts for enhancement of the battery efficiency. 
     Especially, in order to charge different electronic devices, power adaptors suitable for the respective electronic devices should be individually provided, which causes users to feel inconvenient. Many researches for wireless charging of electronic devices have been in progress in recent time. The wireless charging is an innovative energy transfer concept, capable of transferring energy in an electromagnetic manner without a line for charging. 
     SUMMARY OF THE INVENTION 
     Therefore, an aspect of the detailed description is to provide a wireless charging apparatus and system, capable of providing a user with a stable wireless charging service by efficiently controlling charging rights for a plurality of electronic devices, which desire to receive a wireless charging service using a shared wireless charging apparatus, by way of providing the wireless charging service through authentication, and simultaneously proposing a new benefit creation model to providers. 
     Another aspect of the detailed description is to provide a wireless charging apparatus and system, capable of providing a user with an efficient wireless charging service for a plurality of electronic devices, which belong to the user and desire to receive the wireless charging service, by setting charging priorities of the plurality of electronic devices based upon power information under a limited wireless charging environment. 
     To achieve these and other advantages and in accordance with the purpose of this specification, as embodied and broadly described herein, a wireless charging apparatus can include a wireless communication unit configured to receive authentication result information relating to a target electronic device from a server having a database, and a wireless charging unit configured to wirelessly transmit power to the target electronic device if the authentication result information indicates a successful authentication. In addition, the wireless communication unit transmits the authentication result information to the target electronic device if the authentication result information indicates an unsuccessful authentication. 
     In one embodiment, the wireless communication unit can receive identification information from the target electronic device and request the authentication result information from the database stored in a server based upon the identification information. 
     In one embodiment, the wireless charging unit can receive identification information from the target electronic device, and the wireless communication unit can request the authentication result information from the server based upon the identification information. 
     In one embodiment, the wireless communication unit can request payment information from the target electronic device. 
     In one embodiment, the wireless communication unit can receive the requested payment information from the target electronic device and transmit the received payment information to the server. 
     In one embodiment, the wireless communication unit can receive approval information in response to the payment information from the server and transmit the received approval information to the target electronic device. 
     In one embodiment, the wireless communication unit can receive account information related to the target electronic device from the server, and the wireless charging unit can wirelessly transmit power to the target electronic device based upon the received account information. 
     In one embodiment, the wireless communication unit can receive the authentication result information related to the target electronic device from the server when the target electronic device is located within an area allowing a wireless power reception. 
     In one embodiment, the wireless communication unit can receive the authentication result information related to the target electronic device from the server when the target electronic device is located within an area, the area not allowing a wireless power reception. 
     In one embodiment, the wireless communication unit can receive the authentication result information related to the target electronic device from the server when the target electronic device is located within an area allowing a wireless data transmission and reception. 
     To achieve these and other advantages and in accordance with the purpose of this specification, as embodied and broadly described herein, a wireless charging apparatus can include a wireless communication unit configured to receive power information from first and second electronic devices, respectively, a controller configured to decide one of the first and second electronic devices as a target electronic device based upon the power information relating to the respective first and second electronic devices, and a wireless charging unit configured to wirelessly transmit power to the target electronic device. 
     In one embodiment, the power information can include at least one of power state information and power control information related to an associated electronic device. 
     In one embodiment, the power state information can include power residual information and minimum power requirement information for wireless communication, both related to an associated electronic device. 
     In one embodiment, the power state information can include information related to wireless data traffic of an associated electronic device. 
     In one embodiment, the power control information can further include information related to urgent charging or non-urgent charging of an associated electronic device. 
     In one embodiment, the controller can monitor whether or not the wireless charging unit stops the wireless power transmission to the target electronic device, and if the transmission stop is monitored, decide the other one, except for the target electronic device, of the first and second electronic devices as a new target electronic device. 
     To achieve these and other advantages and in accordance with the purpose of this specification, as embodied and broadly described herein, a wireless charging system can include a power receiving apparatus configured to wirelessly transmit identification information to a power transmitting apparatus via a power channel or a data channel, and a power transmitting apparatus configured to transmit an authentication request for the power receiving apparatus to a server based upon the identification information, receive authentication result information from the server, wirelessly transmit power to the power receiving apparatus via the power channel if the authentication result information indicates a successful authentication, and transmit the authentication result information to the power receiving apparatus via the data channel if the authentication result information indicates an unsuccessful authentication. 
     Further scope of applicability of the present application will become more apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from the detailed description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments and together with the description serve to explain the principles of the invention. 
       In the drawings: 
         FIG. 1  is an view schematically showing a wireless charging apparatus and an electronic device in accordance with embodiments; 
         FIGS. 2A and 2B  are block diagrams exemplarily showing configurations of an electromagnetic induction type charging apparatus  100  and an electronic device  200  applicable to the embodiments; 
         FIGS. 3A and 3B  are block diagrams showing configurations a magnetic resonance type charging apparatus  100  and the electronic device  200  applicable to the embodiments; 
         FIGS. 4A and 4B  are perspective views exemplarily showing a charging apparatus for charging a plurality of electronic devices in accordance with a first embodiment; 
         FIGS. 5A and 5B  are perspective views showing one type of foldable charging apparatus for charging a plurality of electronic devices in accordance with a second embodiment; 
         FIGS. 6A and 6B  are perspective views showing another type of foldable charging apparatus for charging a plurality of electronic devices in accordance with the second embodiment; 
         FIGS. 7A and 7B  are perspective views showing still another type of foldable charging apparatus for charging a plurality of electronic devices in accordance with the second embodiment; 
         FIGS. 8A and 8B  are perspective views showing a slide type charging apparatus for charging a plurality of electronic devices in accordance with a third embodiment; 
         FIG. 9  is a block diagram of a charging apparatus having an additional configuration in addition to the configuration shown in  FIGS. 2 and 3 ; 
         FIG. 10  is a block diagram showing a configuration when the electronic device  200  according to the embodiments is a mobile communication terminal; 
         FIG. 11  is a block diagram showing a configuration when the electronic device  200  according to the embodiments is a multimedia device, for example, a tablet; 
         FIG. 12A  is an overview showing a wireless charging system in accordance with one embodiment; 
         FIG. 12B  is an overview showing a wireless charging system in accordance with another embodiment; 
         FIG. 13  is a flowchart showing an operation control process of a wireless charging system in accordance with one embodiment; 
         FIGS. 14A to 14C  are overviews showing the operation control process of the wireless charging system in accordance with the one embodiment; 
         FIG. 15  is a flowchart showing an operation control process of the wireless charging system in accordance with another embodiment; 
         FIGS. 16A to 16F  are overviews showing the operation control process of the wireless charging system in accordance with the another embodiment; 
         FIGS. 17A to 17C  are overviews showing wireless charging service areas in accordance with the embodiments; 
         FIG. 18  is an overview showing a wireless charging system in accordance with another embodiment; 
         FIG. 19  is an overview showing power information about an electronic device  200  in accordance with another embodiment; and 
         FIG. 20  is a flowchart showing an operation control process of a wireless charging system in accordance with another embodiment. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Technical terms used in this specification are used to merely illustrate specific embodiments, and should be understood that they are not intended to limit the present disclosure. As far as not being defined differently, all terms used herein including technical or scientific terms can have the same meaning as those generally understood by an ordinary person skilled in the art to which the present disclosure belongs, and should not be construed in an excessively comprehensive meaning or an excessively restricted meaning. In addition, if a technical term used in the description of the present disclosure is an erroneous term that fails to clearly express the idea of the present disclosure, it should be replaced by a technical term that can be properly understood by the skilled person in the art. In addition, general terms used in the description of the present disclosure should be construed according to definitions in dictionaries or according to its front or rear context, and should not be construed to have an excessively restrained meaning. 
     A singular representation can include a plural representation as far as it represents a definitely different meaning from the context. Terms ‘include’ or ‘has’ used herein should be understood that they are intended to indicate an existence of several components or several steps, disclosed in the specification, and it can also be understood that part of the components or steps can not be included or additional components or steps can further be included. 
     A suffix “module” or “unit” used for constituent elements disclosed in the following description is merely intended for easy description of the specification, and the suffix itself does not give any special meaning or function. 
     An electronic device described in this specification can be comprehensively construed as any portable electronic device, which can include a mobile phone, a cellular phone, a smart phone, a personal digital assistants (PDA), a personal multimedia player (PMP), a tablet, multimedia equipment and the like. 
     It can be easily understood by a person skilled in the art that the configurations according to the embodiments of this specification are applicable to stationary terminals, such as digital TV, desktop computer and the like, unless limited to applying to a terminal. 
     It will be understood that, although the terms first, second, etc. can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure. 
     Embodiments of the present invention will be described below in detail with reference to the accompanying drawings where those components are rendered the same reference number that are the same or are in correspondence, regardless of the figure number, and redundant explanations are omitted. 
     In describing the present invention, if a detailed explanation for a related known function or construction is considered to unnecessarily divert the gist of the present invention, such explanation has been omitted but would be understood by those skilled in the art. The accompanying drawings are used to help easily understood the technical idea of the present invention and it should be understood that the idea of the present invention is not limited by the accompanying drawings. The idea of the present invention should be construed to extend to any alterations, equivalents and substitutes besides the accompanying drawings. 
       FIG. 1  is an view schematically showing a wireless charging apparatus and an electronic device in accordance with embodiments. 
     As shown in  FIG. 1 , an electronic device  200  is allowed for wireless charging. Accordingly, the electronic device  200  can receive wireless power from the charging apparatus  100  to charge or recharge a battery. 
     The charging apparatus  100  can employ at least one of an electromagnetic induction type using an electromagnetic induction phenomenon and a magnetic resonance type of transferring power using a specific frequency. 
     The induction type wireless charging is a technique for wirelessly transmitting power using primary and secondary coils, namely, indicates a wireless charging using an electromagnetic induction principle that current is induced from one coil to another coil by a magnetic field. 
     The magnetic resonance type charging is to match a resonant frequency of a charging apparatus with a resonant frequency of an electronic device such that energy can be transferred from the charging apparatus to the electronic device. 
     Meanwhile, the electronic device  200  and the charging apparatus  100  can be spaced apart from each other by a specific distance. As such, since the charging apparatus  100  and the electronic device  200  have the specific distance d therebetween without contact with each other, various electronic devices can be charged or recharged at the same time, unlike the related art. 
     Hereinafter, description will be given of configurations of a charging apparatus and an electronic device upon employing an electromagnetic induction mechanism. 
       FIGS. 2A and 2B  are block diagrams exemplarily showing configurations of an electromagnetic induction type charging apparatus  100  and an electronic device  200  applicable to the embodiments. 
     First, referring to  FIG. 2A , the charging apparatus  100  can charge a battery of the electronic device  200  using an induced current. The electronic device  200 , as will be explained later, can be a mobile communication terminal (for example, mobile phone, cellular phone) or a multimedia device. When the electronic device is a mobile terminal will be described with reference to  FIG. 10 . 
     The charging apparatus  100  is an apparatus for wirelessly charging a battery of the electronic device  100 , namely, a power transmitter for transmitting power required for the battery charging. 
     The charging apparatus  100  can include an electromagnetic induction type charging unit  110 . The electromagnetic induction type charging unit  110  can include a primary coil  111 , a sensor  112 , a switching unit  113 , a comparing unit  114 , a charging controller  115  and an output unit  116 . 
     The primary coil  111  can generate an electromagnetic field in response to power applied. The primary coil  111  can be implemented as a solenoid. Also, an electromagnetic field generated from the primary coil  111  can induce a magnetic field on a secondary coil  2931  of the electronic device  200 , thereby generating an induced current on the secondary coil  2931 . 
     The sensor  112  can detect a contact with the electronic device  200  when the electronic device  200  is placed on the charging apparatus  100 , and recognize the position of the electronic device  200  on the charging apparatus  100 . 
     The sensor  112  can allow the electronic device  200  to be aligned on a position with the highest charging efficiency when the electronic device  200  is placed on the charging apparatus  100 . When the electronic device  200  is placed on the charging apparatus  100 , the highest charging efficiency can be obtained when a center of the primary coil  111  is in alignment with a center of the secondary coil  2931 . 
     Therefore, to make the center of the primary coil  111  of the charging apparatus  100  be in alignment with the center of the secondary coil  2931  of the electronic device  200 , a magnet can be installed in the center of the primary coil  111 . Accordingly, when the center of the secondary coil  2931  is approached within a preset radius based on the center of the primary coil  111 , the magnet can attract the electronic device  200  by its magnetic force such that the centers of the primary coil  111  and the secondary coil  2931  can be in alignment with each other. 
     Here, if a distance between the centers of the primary coil  111  and the secondary coil  2931  gets out of an allowed error range D, the charging apparatus  100  recognizes it as the electronic device  200  fails to meet an alignment condition, so it can transmit a signal to the electronic device  200  to indicate an unable wireless charging. 
     That is, when the centers of the primary coil  111  and the secondary coil  2931  overlap with each other, if the distance between the centers thereof does not meet the alignment condition, the charging apparatus  100  can not permit the wireless charging for a battery of the electronic device  200 . Here, the charging apparatus  100  can transmit information relating to a direction and distance that the center of the secondary coil  2931  is misaligned with the center of the first primary coil  111  to the electronic device  200 . 
     The switching unit  113  can serve to supply external power to the primary coil  111  or cut the supplied external power off according to the control of the charging controller  115 . 
     The comparing unit  114  can function to check a normal or abnormal operation of the charging apparatus  100 . The comparing unit  114  can detect a voltage or current of external power, and check whether or not the detected voltage or current exceeds a threshold value. The comparing unit  114  can include a resistance for detecting the voltage or current of the external power and a comparer for comparing the detected power voltage value or current value with a threshold value to output the comparison result. 
     For example, the comparing unit  114  checks whether or not the external power exceeds 5V and outputs the checked result to the charging controller  115 . When the external power exceeds 5V, then the charging controller  115  controls the switching unit  113  to block power applied to the secondary coil  2931 . 
     The charging controller  115  can control the switching unit  113  according to the checked result sent from the comparing unit  114 . The charging controller  114  can also perform communications with the electronic device  200  so as to check a charging state of the battery. For example, the charging controller  115  can check the charging state of the battery  216  by performing a short-range communication, such as Bluetooth, with the electronic device  200 . 
     Also, the charging apparatus  100  can charge a plurality of electronic devices at the same time. 
     In other words, two or more electronic devices can be placed on the charging apparatus  100  at the same time for charging, and the electronic devices can be different types of devices. For example, when a mobile terminal, a multimedia player, PDA and the like are simultaneously placed on the charging apparatus  100 , they can all experience the wireless charging. 
     The output unit  116  can display the charging state according to the control of the charging controller  115 . The output unit  116  can be a light-emitting diode and/or LCD. 
     Referring to  FIG. 2B , the electronic device  200  can include a power supply unit  290 . The power supply unit  290  can include a battery  291 , a charging unit  292  and a wireless power receiving unit  293 . 
     The wireless power receiving unit  293  can function to receive an induced current generated in the charging apparatus  100 . 
     The wireless power receiving unit  293  can include a secondary coil  2931 , a rectifier  2932 , a converter  2933  and a communication controller  2934 . 
     The secondary coil  2931  can generate an induced current in response to the changes in an electromagnetic field generated from the primary coil  111  of the charging apparatus  100 . That is, the secondary coil  2931  can generate an induced current in response to reception of the induced current generated from the primary coil  111  of the charging apparatus  100 . 
     The rectifier  2932  can be an alternating current (AC)-direct current (DC) converter for converting the induced current received via the secondary coil  2931  into DC power (or DC voltage). 
     The converter  2933  can convert DC power output from the rectifier  2932  into a particular voltage. That is, the converter  2933  can function to convert the DC power into a voltage appropriate for battery charging. For example, if the DC power output via the rectifier  2932  is 9V, the converter  2933  converts 9V into 5V. 
     The communication controller  2934  can perform communications with the charging apparatus  100 . The communication controller  2934  can request an authentication from the charging apparatus as to whether a corresponding electronic device is a chargeable device or not. Upon the authentication request, the communication controller  2934  can transmit identification information, such as device number of the battery or the like, to the charging apparatus  100 . 
     The charging unit  292  can charge the battery  291  using the induced current received via the secondary coil  2931 . In other words, the charging unit  292  can supply the induced current, which is generated from the secondary coil  2931  by an electromagnetic field induction occurred in a charging pad, to the battery  291 . The charging unit  292  can include a charging circuit for controlling battery charging, and an anti-overcurrent/overvoltage circuit for preventing overcurrent and overvoltage. 
     Hereinafter, description will be given of configurations of a magnetic resonance type charging apparatus and an electronic device with reference to  FIG. 3 . 
       FIGS. 3A and 3B  are block diagrams exemplarily showing configurations a magnetic resonance type charging apparatus  100  and the electronic device  200  applicable to the embodiments. 
     First, resonance will be briefly described. 
     A resonance indicates a phenomenon in which a vibration system periodically receives an external force at the same frequency as its natural frequency and accordingly its amplitude distinctly increases. The resonance is a phenomenon occurred with all types of vibrations, such as mechanical vibrations, electrical vibrations and the like. In general, when applying an external force enough to vibrate the vibration system, if the natural frequency is the same as the frequency of the externally applied force, the vibration becomes more severe and the amplitude increases. 
     Similarly, if a plurality of vibrating screens spaced apart from one another within a preset distance vibrate at the same frequency, the plurality of vibrating screens are mutually resonated. Resistance can be decreased among the plurality of vibrating screens. A resonator can be created by use of coil and condenser in an electric circuit. The resonator normally relates to electromagnetic waves or electric oscillation. The electric circuit can use the resonator as a circuit for selecting a specific frequency from electric waves received via an antenna. 
     Therefore, the electronic device  200  shown in  FIGS. 3A and 3B  can be allowed such that the battery can be charged using coupling of plane wave radiation, which is generated in the charging apparatus  100 . 
     In detail, referring to  FIG. 3A , the charging apparatus  100  can include a magnetic resonance type charging unit  120 . The magnetic resonance type charging unit  120  can include a transmit antenna  121 , a sensor  122 , a matching element  123 , an oscillator  124  and a charging controller  125 . Also, the charging apparatus  100  can further include an output unit  126 . 
     The transmit antenna  121  can be tuned (aligned) with a receive antenna to be resonant at the same frequency or near the same frequency as the receive antenna. 
     The sensor  122  can detect the presence or non-presence of activated receivers near a near-field generated by the transmit antenna  121 . As an example, the sensor  122  can monitor a current, which is affected by presence or non-presence of active receivers near the near-field generated by the transmit antenna  121 . The detection can be monitored by the controller  125  to be used upon determining whether or not to enable the oscillator  124  in order to transmit energy for communication with the electronic device  200 . 
     The matching element  123  can induce a radio frequency (RF) signal determined by the oscillator  124 , reduce a harmonic discharge to a level enough to prevent self-jamming of devices coupled to the electronic device  200 , and match impedance (for example, 50 ohm) with the transmit antenna  121 . 
     The oscillator  124  can be configured to generate an RF signal at a desired frequency and control a frequency in response to a control signal. 
     The controller  125  can enable the oscillator  124  during a transmission phase, control a frequency of the oscillator  124 , and adjust an output power level to implement a communication protocol for interaction with neighboring devices. 
     The output unit  126  can display a charging state according to the control of the charging controller. The output unit  126  can be a light-emitting diode and/or LCD. 
     Referring to  FIG. 3B , the electronic device  200  can include a power supply unit  290 . The power supply unit  290  can include a battery  291 , a charging unit  292  and a wireless power receiving unit  293 . 
     The wireless power receiving unit  293  can include a receive antenna  2931 ′, a rectifier  2932 , a converter  2933  and a communication controller  2934 . 
     The receive antenna  2931 ′ can be tuned with the transmit antenna of the charging apparatus  100  to be resonant at the same frequency or near the same frequency as the transmit antenna of the charging apparatus  100 . 
     The rectifier  2932  can rectify an RF energy signal received via the receive antenna  2931 ′ into non-AC power. The converter  2933  can convert an energy potential (for example, voltage) compatible with the electronic device  200  into the rectified RF energy signal. 
     The communication controller  2934  can perform communications with the charging apparatus  100 . The communication controller  2934  can request an authentication from the charging apparatus  100  as to whether a corresponding electronic device is a chargeable device or not. Upon the authentication request, the communication controller  2934  can transmit identification information, such as device number of the battery or the like, to the charging apparatus  100 . 
     The charging unit  292  can charge the battery  291  using the RF energy signal received via the receive antenna  2931 ′. In other words, the charging unit  292  can convert the RF energy signal sent from the charging apparatus  100  into a format useable in the electronic device  200  to supply to the battery  291 . The charging unit  292  can include a charging circuit for controlling battery charging, and an anti-overcurrent/overvoltage circuit for preventing an overcurrent and overvoltage. 
     Hereinafter, description will be given of an external structure of the charging apparatus with reference to  FIGS. 4A and 4B . 
       FIGS. 4A and 4B  are perspective views exemplarily showing a charging apparatus for charging a plurality of electronic devices in accordance with a first embodiment. 
     Referring to  FIG. 4A , a charging apparatus  100  for charging a plurality of electronic devices can be a pad type. 
     The pad type charging apparatus can be configured such that an upper surface of its body can be stepped. The electronic device  200  can be placed on a lower stepped portion of the stepped portions of the body. As aforesaid, the electromagnetic induction type charging unit  110  or the magnetic resonance type charging unit  120  can be received within the lower stepped portion of the body so as to be protected from external impact or contact with foreign materials. 
     An upper surface of the lower stepped portion can be formed of an insulating material, for example, plastic, to prevent an occurrence of a short due to an electrical conduction with the electronic device. Alternatively, the upper surface thereof can be coated with an insulating material. 
     The lower stepped portion can include a guide member for preventing the electronic device from being slid out of the upper surface when being placed on the lower stepped portion. The guide member can be installed along an edge of the upper surface of the charging apparatus, or a plurality of guide members can be installed at parts of the edge of the upper surface. 
     The upper stepped portion of the stepped portions can be shown having a display unit  130 . Here, the upper stepped portion can be inclined such that a front surface of the display unit  130  cannot be level with the ground. That is, when the display unit  130  is installed such that the front surface is level with the ground, it can cause a problem relating to user&#39;s visibility. Hence, the display unit  130  can preferably be installed to have an inclination. To this end, the upper stepped portion can be formed to be inclined toward the lower stepped portion. 
     Also, a plurality of holes can be formed at the upper surface of the pad type charging apparatus. Audio output units  140  can be mounted in the plurality of holes, respectively, such that sounds generated from the audio output units  140  can be output to the exterior via the plurality of holes. 
     Alternatively, the plurality of holes can be formed at a side surface of the pad type charging apparatus, and the audio output units  140  can be mounted in the plurality of holes present at the side surface. 
     The aforesaid output unit  116  or  126  can be mounted on the upper surface of the pad type charging apparatus. The output unit  116  can be a light-emitting diode as mentioned above, and thusly light on or light off according to a charging state. Alternatively, the output unit  116  can output a different color according to the charging state. 
     A plurality of holes for heat exchange can be formed at the side surface of the pad type charging apparatus. The plurality of holes can alternatively be formed at the upper surface of the pad type charging apparatus. A support member can be installed on a lower surface of the pad type charging apparatus. The support member can generate a frictional force against the ground such that the pad type charging apparatus cannot be easily slipped on the ground. The support member can be made of rubber. 
     Meanwhile, referring to  FIG. 4B , the pad type charging apparatus  100  can have a width wider than the sum of widths of two or more electronic devices, whereby at least two electronic devices can simultaneously be charged. 
       FIGS. 5A and 5B  are perspective views showing one type of foldable charging apparatus for charging a plurality of electronic devices in accordance with a second embodiment, and  FIG. 6  is a perspective view showing another type of foldable charging apparatus for charging a plurality of electronic devices in accordance with the second embodiment. 
     As shown in  FIGS. 5A ,  5 B,  6 A and  6 B, the charging apparatus can be a foldable type. 
     In detail, referring to  FIG. 5A , a main body of the charging apparatus can be obscured by a cover body  170 , which is coupled to the main body by a hinge.  FIG. 5  shows that a hinge coupling structure is formed at side surfaces of the main body and the cover body  170 . Such structure can allow the cover body  170  to be folded or unfolded like a book. 
     An upper surface of the main body of the charging apparatus  100  can be stepped. 
     The main body can accommodate therein the electromagnetic induction type charging unit  110  or the magnetic resonance type charging unit  120 . 
     An upper surface of the cover body  170  can be formed of an insulating material, for example, plastic, to prevent an occurrence of a short due to an electrical conduction with the electronic device. Alternatively, the upper surface thereof can be coated with an insulating material. 
     The upper surface of the cover body  170  can be provided with a guide member for preventing the electronic device  200  from being slid out of the upper surface when being placed on the upper surface. The guide member can be installed along an edge of the upper surface of the charging apparatus, or a plurality of guide members can be installed at parts of the edge of the upper surface. 
     The cover body  170  can additionally accommodate therein the electromagnetic induction type charging unit  110  or the magnetic resonance type charging unit  120 , independent of the main body. Here, the main body and the cover body  170  can accommodate the same type of charging units or different types of charging units. 
     When the main body is obscured by the cover body  170 , the charging unit  110  or  120  accommodated within the main body can be controlled not to be run. To this end, a sensor for detecting opening or closing of the charging apparatus or a switch switched on or off in response to opening or closing of the charging apparatus can be mounted within the cover body  170  or on the upper surface of the main body. 
     Referring to  FIG. 5B , when the cover body  170  is unfolded, the cover body  170  can be flush with the main body. The inner surface of the cover body  170  can be flat to allow the electronic device  200  to be placed thereon. Also, the inner surface of the cover body  170  can be provided with a guide member for preventing the electronic device  200  from being slid out when being placed on the upper surface. 
     When the cover body  170  is unfolded, the charging unit  110  or  120  accommodated in the main body can be run by the aforesaid sensor or switch. When the charging unit  110  or  120  accommodated in the main body is run, the sensor  112  or  122  within the charging unit  110  or  120  can detect whether or not an electronic device  200  is placed on the main body of the charging apparatus  100 . If it is detected as the electronic device  200  is placed on the main body of the charging apparatus  100 , the charging unit  110  or  120  accommodated in the main body can start charging. 
     Referring to  FIGS. 6A and 6B , hinge coupling structures can be formed at lower end portions of the main body and the cover body  170  in order to improve spatial efficiency on a narrow table. That is, even if the cover body  170  is open, the charging apparatus becomes longer in a lengthwise direction, which results in improvement of spatial efficiency on the narrow table. 
       FIGS. 7A and 7B  are perspective views showing still another type of foldable charging apparatus for charging a plurality of electronic devices in accordance with the second embodiment. 
     As shown in  FIGS. 7A and 7B , a plurality of cover bodies  171  and  172  can be coupled to a main body of the charging apparatus  100  by hinges. Each of the cover bodies  171  and  172  can additionally accommodate therein the aforesaid electromagnetic induction type charging unit  110  or the magnetic resonance type charging unit  120 . As the plurality of cover bodies are employed, the number of electronic devices to be charged can be increased. 
       FIGS. 8A and 8B  are perspective views showing a slide type charging apparatus for charging a plurality of electronic devices in accordance with a third embodiment. 
     As shown in  FIG. 8A , a charging apparatus  100  for charging a plurality of electronic devices can be a slide type. 
     An extendable body  180  can be slidably retracted into one side surface of a main body of the charging apparatus  100 . The extendable body  180  can be slid by a user&#39;s force or an elastic force to be drawn out as shown in  FIG. 8B . A stopper can be formed at one end of the extendable body  180  so as to be obviated from being completely separated from the main body even if the extendable body  180  is pulled out by an excessive force. 
     An upper surface of the main body of the charging apparatus  100  can be stepped. 
     The aforesaid electromagnetic induction type charging unit  110  or the magnetic resonance type charging unit  120  can be mounted within the main body and the extendable body  180 . 
     The upper surfaces of the main body and the extendable body  180  can be formed of an insulating material, for example, plastic, to prevent an occurrence of a short due to an electrical conduction with the electronic device. Alternatively, the upper surfaces thereof can be coated with an insulating material. 
     Each upper surface of the main body and the extendable body  180  can be provided with a guide member for preventing the electronic device  200  from being slid out of the upper surface when being placed on the upper surface. The guide member can be installed along an edge of the upper surface of the charging apparatus, or a plurality of guide members can be installed at parts of the edge of the upper surface. 
       FIG. 9  is a block diagram of a charging apparatus having an additional configuration in addition to the configuration shown in  FIGS. 2 and 3 . 
     As shown in  FIG. 9 , the charging apparatus  100  can further include a controller  160 , a display unit  130 , an audio output unit  140  and a communication unit  150 , in addition to the electromagnetic induction type charging unit  110  or the magnetic resonance type charging unit  120 . 
     The controller  160  can control the charging unit  110  or  120 , the display unit  130 , the audio output unit  140  and the communication unit  150 . 
     The display unit  130  can include at least one of a liquid crystal display (LCD), a thin film transistor LCD (TFT LCD), an organic light-emitting diode (OLED), a flexible display and a three-dimensional (3D) display. 
     The communication unit  150  can include at least one electronic component of Bluetooth™, Zigbee, ultra wide band (UWB), wireless USB and near field communication (NFC), so as to perform data communication with the electronic device  200 . 
     The charging apparatus  100  can further include a microphone. 
     Hereinafter, description will be given of a configuration when the electronic device  200  is a mobile communication terminal. 
       FIG. 10  is a block diagram showing a configuration when the electronic device  200  according to the embodiments is a mobile communication terminal. 
     The mobile communication electronic device  200  can include the power supply unit  290  as shown in  FIG. 2  or  3 . 
     The electronic device  200  can further include can include components, such as a wireless communication unit  210 , an Audio/Video (A/V) input unit  220 , a user input unit  230 , a sensing unit  240 , an output unit  250 , a memory  260 , an interface unit  270 , a controller  280  and the like.  FIG. 10  shows the electronic device  200  having various components, but it is understood that implementing all of the illustrated components is not a requirement. Greater or fewer components can alternatively be implemented. 
     Hereinafter, each component is described in sequence. 
     The wireless communication unit  210  can typically include one or more modules which permit wireless communications between the electronic device  200  and a wireless communication system or between the electronic device  200  and a network within which the electronic device  200  is located. For example, the wireless communication unit  210  can include a broadcast receiving module  211 , a mobile communication module  212 , a wireless Internet module  213 , a short-range communication module  214 , a location information module  215  and the like. 
     The broadcasting receiving module  211  receives a broadcast signal and/or broadcast associated information from an external broadcast managing entity via a broadcast channel. 
     The broadcast channel can include a satellite channel and a terrestrial channel. The broadcast managing entity can indicate a server which generates and transmits a broadcast signal and/or broadcast associated information or a server which receives a pre-generated broadcast signal and/or broadcast associated information and sends them to the electronic device. The broadcast signal can be implemented as a TV broadcast signal, a radio broadcast signal, and a data broadcast signal, among others. The broadcast signal can further include a data broadcast signal combined with a TV or radio broadcast signal. 
     Examples of broadcast associated information can include information associated with a broadcast channel, a broadcast program, a broadcast service provider, and the like. The broadcast associated information can be provided via a mobile communication network, and received by the mobile communication module  212 . 
     The broadcast associated information can be implemented in various formats. For instance, broadcast associated information can include Electronic Program Guide (EPG) of Digital Multimedia Broadcasting (DMB), Electronic Service Guide (ESG) of Digital Video Broadcast-Handheld (DVB-H), and the like. 
     The broadcasting receiving module  211  can be configured to receive digital broadcast signals transmitted from various types of broadcast systems. Such broadcast systems can include Digital Multimedia Broadcasting-Terrestrial (DMB-T), Digital Multimedia Broadcasting-Satellite (DMB-S), Media Forward Link Only (MediaFLO), Digital Video Broadcast-Handheld (DVB-H), Integrated Services Digital Broadcast-Terrestrial (ISDB-T) and the like. The broadcasting receiving module  211  can be configured to be suitable for every broadcast system transmitting broadcast signals as well as the digital broadcasting systems. 
     Broadcast signals and/or broadcast associated information received via the broadcasting receiving module  211  can be stored in a suitable device, such as a memory  260 . 
     The mobile communication module  212  transmits/receives wireless signals to/from at least one of network entities (e.g., base station, an external mobile terminal, a server, etc.) on a mobile communication network. Here, the wireless signals can include audio call signal, video (telephony) call signal, or various formats of data according to transmission/reception of text/multimedia messages. 
     The wireless Internet module  213  supports wireless Internet access for the electronic device  200 . This module can be internally or externally coupled to the electronic device  200 . Examples of such wireless Internet access can include Wireless LAN (WLAN) (Wi-Fi), Wireless Broadband (Wibro), Worldwide Interoperability for Microwave Access (Wimax), High Speed Downlink Packet Access (HSDPA) and the like. 
     The short-range communication module  214  denotes a module for short-range communications. Suitable technologies for implementing this module can include BLUETOOTH™, Radio Frequency IDentification (RFID), Infrared Data Association (IrDA), Ultra-WideBand (UWB), ZigBee™, and the like. Meanwhile, wired short-range communication technologies can include Universal Serial Bus (USB), IEEE 1394, thunderbolt from Intel Corporation and the like. 
     The location information module  215  denotes a module for detecting or calculating a position of a mobile terminal. An example of the location information module  215  can include a Global Position System (GPS) module. 
     Referring to  FIG. 10 , the A/V input unit  220  is configured to provide audio or video signal input to the electronic device. The A/V input unit  220  can include a camera  221  and a microphone  222 . The camera  221  receives and processes image frames of still pictures or video obtained by image sensors in a video call mode or a capturing mode. The processed image frames can be displayed on a display unit  251 . 
     The image frames processed by the camera  221  can be stored in the memory  260  or transmitted to the exterior via the wireless communication unit  210 . Two or more cameras  221  can be provided according to the configuration of the electronic device. 
     The microphone  222  can receive an external audio signal while the electronic device is in a particular mode, such as a phone call mode, a recording mode, a voice recognition mode, or the like. This audio signal is processed into digital data. The processed digital data is converted for output into a format transmittable to a mobile communication base station via the mobile communication module  212  when in the phone call mode. The microphone  222  can include assorted noise removing algorithms to remove noise generated in the course of receiving the external audio signal. 
     The user input unit  230  can generate input data input by a user to control the operation of the electronic device. The user input unit  230  can include a keypad, a dome switch, a touchpad (e.g., static pressure/capacitance), a jog wheel, a jog switch and the like. 
     The sensing unit  240  provides status measurements of various aspects of the electronic device. For instance, the sensing unit  240  can detect an open/close status of the electronic device  200 , a change in a location of the electronic device  200 , a presence or absence of user contact with the electronic device  200 , the location of the electronic device  200 , acceleration/deceleration of the electronic device  200 , and the like, so as to generate a sensing signal for controlling the operation of the electronic device  200 . For example, regarding a slide-type electronic device, the sensing unit  240  can sense whether a sliding portion of the electronic device is open or closed. Other examples include sensing functions, such as the sensing unit  240  sensing the presence or absence of power provided by the power supply unit  290 , the presence or absence of a coupling or other connection between the interface unit  270  and an external device. Meanwhile, the sensing unit  240  can include a proximity sensor  241 . 
     The output unit  250  is configured to output an audio signal, a video signal or a tactile signal. The output unit  250  can include a display unit  251 , an audio output module  252 , an alarm unit  253  and a haptic module  254 . 
     The display unit  251  can output information processed in the electronic device  200 . For example, when the electronic device  200  is operating in a phone call mode, the display unit  251  will provide a User Interface (UI) or a Graphic User Interface (GUI), which includes information associated with the call. As another example, if the electronic device  200  is in a video call mode or a capturing mode, the display unit  251  can additionally or alternatively display images captured and/or received, UI, or GUI. 
     The display unit  251  can be implemented using, for example, at least one of a Liquid Crystal Display (LCD), a Thin Film Transistor-Liquid Crystal Display (TFT-LCD), an Organic Light-Emitting Diode (OLED), a flexible display, a three-dimensional (3D) display, or the like. 
     Some of such displays  151  can be implemented as a transparent type or an optical transparent type through which the exterior is visible, which is referred to as ‘transparent display’. A representative example of the transparent display can include a Transparent OLED (TOLED), and the like. The rear surface of the display unit  251  can also be implemented to be optically transparent. Under this configuration, a user can view an object positioned at a rear side of a terminal body through a region occupied by the display unit  251  of the terminal body. 
     The display unit  251  can be implemented in two or more in number according to a configured aspect of the electronic device  200 . For instance, a plurality of the displays  151  can be arranged on one surface to be spaced apart from or integrated with each other, or can be arranged on different surfaces. 
     Here, if the display unit  251  and a touch sensitive sensor (referred to as a touch sensor) have a layered structure therebetween, the structure can be referred to as a touch screen. The display unit  251  can be used as an input device rather than an output device. The touch sensor can be implemented as a touch film, a touch sheet, a touch pad, and the like. 
     The touch sensor can be configured to convert changes of a pressure applied to a specific part of the display unit  251 , or a capacitance occurring from a specific part of the display unit  251 , into electric input signals. Also, the touch sensor can be configured to sense not only a touched position and a touched area, but also a touch pressure. 
     When touch inputs are sensed by the touch sensors, corresponding signals are transmitted to a touch controller. The touch controller processes the received signals, and then transmits corresponding data to the controller  280 . Accordingly, the controller  280  can sense which region of the display unit  251  has been touched. 
     Still referring to  FIG. 10 , a proximity sensor  241  can be arranged at an inner region of the electronic device  200  covered by the touch screen, or near the touch screen. The proximity sensor  241  indicates a sensor to sense presence or absence of an object approaching to a surface to be sensed, or an object disposed near a surface to be sensed, by using an electromagnetic field or infrared rays without a mechanical contact. The proximity sensor  241  has a longer lifespan and a more enhanced utility than a contact sensor. 
     The proximity sensor  241  can include a transmissive type photoelectric sensor, a direct reflective type photoelectric sensor, a minor reflective type photoelectric sensor, a high-frequency oscillation proximity sensor, a capacitance type proximity sensor, a magnetic type proximity sensor, an infrared rays proximity sensor, and so on. When the touch screen is implemented as a capacitance type, proximity of a pointer to the touch screen is sensed by changes of an electromagnetic field. The touch screen (touch sensor) can be categorized into a proximity sensor. 
     Hereinafter, for the sake of brief explanation, a status that the pointer is positioned to be proximate onto the touch screen without contact will be referred to as ‘proximity touch’, whereas a status that the pointer substantially comes in contact with the touch screen will be referred to as ‘contact touch’. For the position corresponding to the proximity touch of the pointer on the touch screen, such position corresponds to a position where the pointer faces perpendicular to the touch screen upon the proximity touch of the pointer. 
     The proximity sensor  241  senses proximity touch, and proximity touch patterns (e.g., distance, direction, speed, time, position, moving status, etc.). Information relating to the sensed proximity touch and the sensed proximity touch patterns can be output onto the touch screen. 
     The audio output module  252  can output audio data received from the wireless communication unit  210  or stored in the memory  260 , in a call-receiving mode, a call-placing mode, a recording mode, a voice recognition mode, a broadcast reception mode, and so on. The audio output module  252  can output audio signals relating to functions performed in the electronic device  200 , e.g., sound alarming a call received or a message received, and so on. The audio output module  252  can include a receiver, a speaker, a buzzer, and so on. 
     The alarm unit  253  outputs signals notifying occurrence of events from the electronic device  200 . The events occurring from the electronic device  200  can include call received, message received, key signal input, touch input, and so on. The alarm unit  253  can output not only video or audio signals, but also other types of signals such as signals notifying occurrence of events in a vibration manner. Since the video or audio signals can be output through the display unit  251  or the audio output module  252 , the display unit  251  and the audio output module  252  can be categorized into a part of the alarm unit  253 . 
     The haptic module  254  generates various tactile effects which a user can feel. A representative example of the tactile effects generated by the haptic module  254  includes vibration. Vibration generated by the haptic module  254  can have a controllable intensity, a controllable pattern, and so on. For instance, different vibration can be output in a synthesized manner or in a sequential manner. 
     The haptic module  254  can generate various tactile effects, including not only vibration, but also arrangement of pins vertically moving with respect to a skin being touched (contacted), air injection force or air suction force through an injection hole or a suction hole, touch by a skin surface, presence or absence of contact with an electrode, effects by stimulus such as an electrostatic force, reproduction of cold or hot feeling using a heat absorbing device or a heat emitting device, and the like. 
     The haptic module  254  can be configured to transmit tactile effects (signals) through a user&#39;s direct contact, or a user&#39;s muscular sense using a finger or a hand. The haptic module  254  can be implemented in two or more in number according to the configuration of the electronic device  200 . 
     The memory  260  can store a program for the processing and control of the controller  280 . Alternatively, the memory  260  can temporarily store input/output data (e.g., phonebook data, messages, still images, video and the like). Also, the memory  260  can store data related to various patterns of vibrations and audio output upon the touch input on the touch screen. 
     Also, the memory  260  can store a wireless charging application downloaded from an application providing server (e.g., App store). 
     The memory  260  can be implemented using any type of suitable storage medium including a flash memory type, a hard disk type, a memory card type (e.g., SD or DX memory), Random Access Memory (RAM), Static Random Access Memory (SRAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Programmable Read-Only Memory (PROM), magnetic memory, magnetic disk, optical disk, and the like. Also, the electronic device  200  can operate a web storage which performs the storage function of the memory  260  on the Internet. 
     The interface unit  270  can generally be implemented to interface the electronic device  200  with external devices. The interface unit  270  can allow a data reception from an external device, a power delivery to each component in the electronic device  200 , or a data transmission from the electronic device  200  to an external device. The interface unit  270  can include, for example, wired/wireless headset ports, external charger ports, wired/wireless data ports, memory card ports, ports for coupling devices having an identification module, audio Input/Output (I/O) ports, video I/O ports, earphone ports, and the like. 
     The identification module can be configured as a chip for storing various information required to authenticate an authority to use the electronic device  200 , which can include a User Identity Module (UIM), a Subscriber Identity Module (SIM), and the like. Also, the device having the identification module (hereinafter, referred to as ‘identification device’) can be implemented in a type of smart card. Hence, the identification device can be coupled to the electronic device  200  via a port. 
     Also, the interface unit  270  can serve as a path for power to be supplied from an external cradle to the electronic device  200  when the electronic device  200  is connected to the external cradle or as a path for transferring various command signals input from the cradle by a user to the electronic device  200 . Such various command signals or power input from the cradle can operate as signals for recognizing that the electronic device  200  has accurately been mounted to the cradle. 
     The controller  280  typically controls the overall operations of the electronic device  200 . For example, the controller  280  performs the control and processing associated with telephony calls, data communications, video calls, and the like. The controller  280  can include a multimedia module  281  which provides multimedia playback. The multimedia module  281  can be configured as part of the controller  280  or as a separate component. 
     The controller  280  can perform a pattern recognition processing so as to recognize writing or drawing input on the touch screen as text or image. 
     The controller  280  can perform a wired charging or a wireless charging according to a user input or an internal input. Here, the internal input can be a signal indicating that an induced current generated from a secondary coil within the electronic device  200  has been detected. 
     The power supply unit  290  provides power required by various components under the control of the controller  280 . The provided power can be internal power, external power, or combination thereof. 
     The power supply unit  290  can include a battery  291  for supplying power to each component of the electronic device  200 , and the battery  291  can include a charging unit  292  for a wired or wireless charging. 
       FIG. 11  is a block diagram showing a configuration when the electronic device  200  is a multimedia device, for example, a tablet. 
     The multimedia device  200 ′ can include the power supply unit  290  shown in  FIG. 2  or  3 . 
     The multimedia device  200 ′ can include a controller  280 . Also, the multimedia device  200 ′ can further include at least one of a display unit  251  and an audio output module  252 . 
     The multimedia device  200 ′ can further include a wireless communication unit  210 . The configurations of the display unit  251  and the audio output module  252  can be understood by the description of  FIG. 10 . 
     The controller  280  can control the display unit  251  and the audio output module  252  to reproduce contents. For example, the controller  280  can output an image in response to the reproduction of contents on a screen of the display unit  251 , and output sound in response to the reproduction of contents via the audio output module  252 . 
     The wireless communication unit  210  can indicate a short-range communication module, which uses wireless short-range communication technologies including Bluetooth, Radio Frequency IDentification (RFID), Infrared Data Association (IrDA), Ultra WideBand (UWB), ZigBee, and the like. Meanwhile, wired short-range communication technologies can include Universal Serial Bus (USB), IEEE 1394, thunderbolt from Intel Corporation and the like. 
     The foregoing description has been given of the configuration of the multimedia device  200 ′. Hereinafter, operations of the charging apparatus  100  and the electronic device  200  will be described. 
       FIG. 12A  is an overview showing a wireless charging system in accordance with one embodiment. 
     A wireless charging system can include a charging apparatus  100 , an electronic device  200  and a server  300 . The server  300  can include a communication unit  310 , a memory  320  and a controller  330 . 
     The communication unit  310  can allow communications between the server  300  and the charging apparatus  100  or between the sever  300  and the electronic device  200 . In accordance with one embodiment, the communication unit  310  can receive identification information relating to the electronic device  200  from the charging apparatus  100 . Here, the identification information relating to the electronic device  200 , for example, can be at least one of a device identification number of the electronic device  200 , a Media Access Control (MAC) address, an Internet Protocol (IP) address and a user&#39;s ID and password stored in the server  300 . 
     The communication unit  310  can transmit authentication result information relating to the electronic device  200  to the charging apparatus  100 . Here, the authentication result information relating to the electronic device  200  can inform successful or unsuccessful authentication of the electronic device  200 . 
     The memory  320  can store a program for operations of the controller  330 , and temporarily store input/output data. In accordance with one embodiment, the memory  320  can store the identification information relating to the electronic device  200 . 
     The controller  330  typically controls an overall operation of the server  300 . In accordance with one embodiment, when receiving an authentication request for the electronic device  200  from the charging apparatus  100 , the controller  330  can determine whether or not the identification information relating to the electronic device  200  included in the authentication request is present in the memory  320  and generate authentication result information according to the determination result. For example, the controller  330  can generate the authentication result information indicating a successful authentication when the identification information is stored in the memory  320 , whereas generating authentication result information indicating an unsuccessful authentication when the identification information is not stored in the memory  320 . 
     The charging unit  110  of the charging apparatus  100  can be connected to the power supply unit  290  of the electronic device  200  via a power channel  410 . The charging unit  110  can wirelessly supply power to the electronic device  200 , or perform transmission and reception of a control signal for wireless power supply with the electronic device  200 . 
     The communication unit  150  of the charging apparatus  100  can be connected to the wireless communication unit  210  of the electronic device  200  via a data channel  420 , and perform data transmission and reception with the electronic device  200  in a wireless manner. 
     Meanwhile, the server  300  can be connected to the electronic device  200  via a network. Here, the server  300  can receive data for registering the electronic device  200  in the server  300  itself from the electronic device  200 , and transmit the registration result to the electronic device  200 . In one embodiment, the electronic device  200  can transmit payment information to the server  300  and the server  300  can transmit approval information to the electronic device  300  in response to the payment information. 
       FIG. 12B  is an overview showing a wireless charging system in accordance with another embodiment. 
     A wireless charging system can include a data and power communication unit, an electronic device  200  and a server  300 . The data and power communication unit can include a charging apparatus  100  and an access point (AP)  500 . 
     The charging apparatus  100  can have the same components as those of the charging apparatus  100  shown in  FIG. 12A . However, the charging apparatus  100  shown in  FIG. 12B  can be different from the charging apparatus  100  shown in  FIG. 12A  in that the function of the communication unit  150  for data transmission and reception with the electronic device  200  or the server  300  is replaced by the AP  500 . 
     The AP  500  can perform a function of connecting (accessing) the charging apparatus  100  to the electronic device  200  or the server  300  using Wi-Fi, Bluetooth or associated standards. The AP  500  can substitute for the communication unit  150  of the charging apparatus  100  shown in  FIG. 12A . The AP  500  can include a communication unit  510 , a memory  520  and a controller  530 . 
     The communication unit  510  can be connected to the wireless communication unit  210  of the electronic device  200  via a data channel  420 , and perform data transmission and reception with the electronic device  200  in a wireless manner. Also, the communication unit  510  can be connected to the communication unit  310  of the server  300  via a network, and perform data transmission and reception with the server  300 . 
     The memory  520  can store information, such as Service Set Identifier (SSID) and the like, which is used by the AP  500  to allow the access from the electronic device  200  to the server  300  on a network. 
     The controller  530  can control operations of the communication unit  510  and the memory  520 . 
       FIG. 13  is a flowchart showing an operation control process of a wireless charging system in accordance with one embodiment. 
     First, the charging unit  110  or  120  of the charging apparatus  100  can execute a digital ping (S 111 ). That is, the charging unit  110  or  120  can transmit a packet, which includes a message for checking whether or not to be accessible to the electronic device  200 . 
     The power supply unit  290  of the electronic device  200  transmits to the charging apparatus  100  a packet, which includes a message indicating presence of the electronic device  200 , in response to the check message (S 112 ). 
     Also, the power supply unit  290  of the electronic device  200  can transmit to the charging apparatus  100  identification information and configuration information both related to the electronic device  200  (S 113 ). 
     Here, the wireless communication unit  210  of the electronic device  200  can transmit the identification information related to the electronic device  200  to the charging apparatus  100  (S  114 ). Here, the communication unit  150  of the charging apparatus  100  can receive the identification information. 
     The communication unit  150  of the charging apparatus  100  can transmit the identification information received from the electronic device  200  to the server  300  (S 115 ). 
     The communication unit  310  of the server  300  can receive the identification information related to the electronic device  200 , and the controller  330  can search for the identification information related to the electronic device  200  from the memory  320  to generate authentication result information. 
     The communication unit  310  of the server  300  can transmit the authentication result information to the charging apparatus  100  (S 116 ). 
     The controller  160  of the charging apparatus  100  can analyze the authentication result information and determine whether the authentication result information indicates successful authentication or unsuccessful authentication (S 117 ). 
     If the authentication result information indicates the successful authentication, the charging unit  110  or  120  of the charging apparatus  100  can wirelessly transmit power to the electronic device  200  (S 118 ). 
     On the other hand, if the authentication result information indicates the unsuccessful authentication, the communication unit  150  of the charging apparatus  100  can wirelessly transmit the authentication result information to the electronic device  200  (S 119 ). 
     Therefore, the electronic device  200  can wirelessly receive power or receive a message indicating the unsuccessful authentication according to whether the identification information related to the electronic device  200  is stored in the server  300 . 
     Meanwhile, the charging apparatus  100  can receive account information related to the electronic device  200  from the server  300 , and wirelessly transmit power to the electronic device  200  based upon the account information. The account information can be information related to whether or not a user of the electronic device  200  has paid a charge for receiving a wireless charging service. If not paid, the charging apparatus  100  can not wirelessly transmit power to the electronic device  200  immediately even if the authentication result information received from the server  300  indicates the successful authentication. Also, the charging apparatus  100  can wirelessly transmit power to the electronic device  200  according to a charge amount or charge time corresponding to the charge paid according to the account information. 
       FIGS. 14A to 14C  are overviews showing the operation control process of the wireless charging system in accordance with the one embodiment. 
     As shown in  FIG. 14A , when the electronic device  200  enters a wireless charging service area (for example, upon receiving a message for checking presence or non-presence of the electronic device  200  from the charging apparatus  100 ), the electronic device  200  can receive an identification information request from the charging apparatus  100  and display an interface for inputting the identification information. The wireless charging service area, as will be explained in detail in  FIG. 17 , can indicate an area in which the power supply unit  290  of the electronic device  200  can receive a message for wirelessly receiving power from the charging unit  110  or  120  of the charging apparatus  100 . 
     The electronic device  200  can provide an interface for allowing inputting of a user&#39;s ID and password stored in the server  300  via the user input unit  230 . Upon receiving the user&#39;s ID and password via the user input unit  230 , the power supply unit  290  or the wireless communication unit  210  of the electronic device  200  can transmit information related to the input ID and password to the charging apparatus  100 . 
     When the charging apparatus  100  receives the information related to the user&#39;s ID and password from the electronic device  200 , the communication unit  150  of the charging apparatus  100  can transmit an authentication request for the electronic device  200 , which includes the information related to the ID and password, to the server  300 . Also, the charging apparatus  100  can receive authentication result information from the server  300  in response to the authentication request for the electronic device  200 . 
     The controller  160  of the charging apparatus  100  can then analyze the authentication result information received from the server  300 . If the authentication result information indicates a successful authentication, the controller  160  can control the charging unit  110  or  120  of the charging apparatus  100  to wirelessly transmit power to the electronic device  200 . On the other hands, if the authentication result information indicates an unsuccessful authentication, the controller  160  can control the communication unit  150  of the charging apparatus  100  to transmit the authentication result information to the electronic device  200 . 
     That is, referring to  FIG. 14B , upon wirelessly receiving power from the charging apparatus  100 , the display unit  251  of the electronic device  200  can display an indicator indicating that the electronic device  200  is being charged. The indicator can indicate a charging state of the electronic device  200 , for example, can indicate a charge amount of the electronic device  200 . 
     Referring to  FIG. 14C , upon reception of the authentication result information from the charging apparatus  100 , the display unit  251  of the electronic device  200  can display a message indicating an unsuccessful authentication. Here, the controller  280  of the electronic device  200  can provide a menu for registering the electronic device  200  or a user of the electronic device  200 , a menu for re-inputting at least of ID and password, and the like. 
       FIG. 15  is a flowchart showing an operation control process of a wireless charging system in accordance with another embodiment. 
     Meanwhile, the communication unit  150  of the charging apparatus  100  can request payment information from the electronic device  200  when transmitting the authentication result information to the electronic device  200  (S 121 ). For example, when the electronic device  200  has been registered in the server  300  but payment information is not present, the communication unit  150  of the charging apparatus  100  can request the payment information from the electronic device  200 . 
     In response to the request, the wireless communication unit  210  of the electronic device  200  can transmit the payment information input by the user to the server  300  (S 122 ). Here, the wireless communication unit  210  of the electronic device  200  can transmit the payment information to the server  300  via the charging apparatus  100  (or the communication unit  150  of the charging apparatus  100 ). 
     Also, the controller  330  of the server  300  can determine whether or not the payment information received from the electronic device  200  is valid, and the communication unit  310  of the server  300  can transmit payment approval information to the electronic device  200  (S 123 ). Here, the communication unit  310  of the server  300  can transmit the payment approval information to the electronic device  200  via the charging apparatus  100  (or the communication unit  150  of the charging apparatus  100 ). 
     Here, the payment approval information can indicate payment success when the payment information is valid, and payment failure when the payment information is not valid. The display unit  251  of the electronic device  200  can display the payment approval information. 
       FIGS. 16A to 16F  are overviews showing the operation control process of the wireless charging system in accordance with the another embodiment. 
     Referring to  FIG. 16A , when the authentication result information relating to the electronic device  200 , received from the server  300 , indicates the unsuccessful authentication, the communication unit  150  of the charging apparatus  100  can request payment information with transmitting the authentication result information to the electronic device  200 . Here, the electronic device  200  can provide an interval for allowing a user to select (determine) whether or not to input payment information. 
     Referring to  FIG. 16B , when the user selects (determines) to input the payment information, the electronic device  200  can receive a wireless charging service select request from the charging apparatus  100  and provide an interface for selecting a wireless charging service. 
     Referring to  FIG. 16C , when the user selects the wireless charging service, the electronic device  200  can receive a payment method select request from the charging apparatus  100  and provide an interface for selecting a payment method. 
     Referring to  FIG. 16D , when the user selects the payment method, the electronic device  200  can receive a request for inputting detailed information relating to the corresponding payment method from the charging apparatus  100  and provide an interface for inputting the detailed information relating to the corresponding payment method. 
     When the user inputs the detailed information of the corresponding payment method, the wireless communication unit  210  of the electronic device  200  can transmit the input detailed information to the server  300 . The controller  320  of the server  300  can then determine whether or not the payment information is valid and generate payment approval information based upon the determination result. The communication unit  310  of the server  300  can transmit the payment approval information to the electronic device  200 . 
     Referring to  FIGS. 16E and 16F , the display unit  251  of the electronic device  200  can display the payment approval information received from the server  300 . When the payment approval information indicates a successful approval, a message indicating that the payment has been approved can be displayed on the display unit  251  as shown in  FIG. 16E . When the payment approval information indicates an unsuccessful approval, a message indicating that the payment has not been approved can be displayed on the display unit  251  as shown in  FIG. 16F . 
       FIG. 17  is an overview showing wireless charging service areas in accordance with embodiments. 
     On the other hand, an region to which the wireless power signal can be approached can be divided into two types. First, active area denotes a region through which a wireless power signal transferring power to the electronic device  200  is passed. Next, semi-active area denotes a region of interest in which the charging apparatus  100  can detect the existence of the electronic device  200 . The semi-active area may also be called as semi-charging area, considering the case where the charging apparatus  100  is transferring a power to the electronic device  200  for charging. Here, the controller  160  can detect whether the electronic device  200  is placed in the active area or semi-active area or removed from the area. Specifically, the controller  160  can detect whether or not the electronic device  200  is placed in the active area or semi-active area using a wireless power signal formed from the charging unit  110  or  120  or a sensor separately provided therein. For instance, the controller  160  can detect the presence of the electronic device  200  by monitoring whether or not the characteristic of power for forming the wireless power signal is changed by the wireless power signal, which is affected by the electronic device  200  existing in the semi-active area. However, the active area and semi-active area can vary according to the wireless power transfer method such as an inductive coupling method, a resonance coupling method, and the like. For example, the charging apparatus  100  can interact with the electronic device  200  placed in the semi-active area, performing various process such as an analog ping, a digital ping, and an identification/configuration process, which will be described in other part of this document. Wireless charging service areas in accordance with the embodiments can include an active area A, a semi-active area B and a non-active area C. The areas A, B and C are divided by each preset distance based upon the center of the charging unit  110  or  120  of the charging apparatus  100 . Here, the areas A and B can be wireless charging service available areas, and the area C can be a wireless charging service unavailable area. 
     The electronic device  200  located within the area C cannot receive a packet from the charging unit  110  or  120  of the charging apparatus  100  via the power supply unit  290 . Also, the electronic device  200  located within the area B can receive a packet from the charging unit  110  or  120  of the charging apparatus  100  via the power supply unit  290 . However, the electronic device  200  within the area B can not receive power in a wireless manner or exhibit power reception efficiency lower than a threshold value. The electronic device  200  located within the area A can receive a packet from the charging unit  110  or  120  of the charging apparatus  100  via the power supply unit  290 , wirelessly receive power and exhibit the power reception efficiency higher than the threshold value. 
     Referring to  FIG. 17A , when the electronic device  200  is located within the area C, the charging unit  110  or  120  of the charging apparatus  100  can not receive a response packet from the electronic device  200  even if performing a digital ping to the electronic device  200 , so it cannot recognize the presence of the electronic device  200 . 
     The communication unit  150  of the charging apparatus  100  can separately receive identification information from the electronic device  200  via a data channel. However, because it corresponds to the electronic device  200  being located within the wireless charging service unavailable area, the charging apparatus  100  can not request an authentication of the electronic device  200  from the server  300 . 
     Referring to  FIG. 17B , when the electronic device  200  is located within the area B, the charging unit  100  or  120  of the charging apparatus  100  can receive a response packet from the electronic device  200  by performing a digital ping to the electronic device  200  and accordingly receive identification information and configuration information related to the electronic device  200 . Here, the charging apparatus  100  can request the authentication of the electronic device  200  from the server  300  and receive authentication result information from the server  300 . However, even if the authentication result information indicates a successful authentication, since the area B is not allowed for wireless power transmission or the electronic device  200  within the area B exhibits lower power reception efficiency than a threshold value, the charging apparatus  100  cannot wirelessly transmit power to the electronic device  200 . 
     Also, here, the communication unit  150  of the charging apparatus  100  can receive separate identification information from the electronic device  200  via a data channel. Since the electronic device  200  is located within the wireless charging service available area, the charging apparatus  100  can request the authentication of the electronic device  200  from the server  300 . 
     Referring to  FIG. 17C , when the electronic device  200  is located within the area A, the charging unit  110  or  120  of the charging apparatus  100  can receive a response packet from the electronic device  200  by performing a digital pin to the electronic device  200 , and accordingly receive identification information and configuration information related to the electronic device  200 . Here, the charging apparatus  100  can request the authentication of the electronic device  200  from the server  300  and receive authentication result information from the server  300 . Also, if the authentication result information indicates a successful authentication, since the area A is allowed for wireless power transmission and the electronic device  200  within the area A exhibits higher power reception efficiency than the threshold value, the charging apparatus  100  can wirelessly transmit power to the electronic device  200 . 
     Also, the communication unit  150  of the charging apparatus  100  can receive separate identification information from the electronic device  200  via a data channel. Since the electronic device  200  is located within the wireless charging service available area, the charging apparatus  100  can request the authentication of the electronic device  200  from the server  300 . 
       FIG. 18  is an overview showing a wireless charging system in accordance with another embodiment. 
     A wireless charging system in accordance with another embodiment can include a charging apparatus  100 , a first electronic device  200   a  and a second electronic device  200   b.    
     The charging apparatus  100  can include a charging unit  110  or  120 , a communication unit  150  and a controller  160 . 
     The charging unit  110  or  120  can wirelessly transmit power to the first or second electronic device  200   a  or  200   b  via a power channel  612  or  614 . 
     The communication unit  150  can receive power information from each of the first electronic devices  200   a  and  200   b  via the data channels  622  and  624 . The power information can include at least one of power state information and power control information related to the corresponding electronic device, and details of the power information can be described with reference to  FIG. 19 . 
     The controller  160  can decide one of the first and second electronic device  200   a  and  200   b  as a target electronic device based upon the power information related to each of the first and second electronic device  200   a  and  200   b . Also, the controller  160  can control the charging unit  110  or  120  to wirelessly transmit power to the target electronic device. 
     Description of the components  210   a ,  280   a  and  290   a  of the first electronic device  200   a  and the components  210   b ,  280   b  and  290   b  of the second electronic device  200   b  is the same as the description of the components  210 ,  280  and  290  of the electronic device  200  shown in  FIG. 12 , so detailed description thereof will be omitted. 
       FIG. 19  is an overview showing power information of an electronic device  200  in accordance with another embodiment. 
     Power information related to an electronic device  200 , as aforementioned, can include at least one of power state information and power control information related to the electronic device  200 . The power state information related to the electronic device  200  can include at least one of power residual ratio and wireless data traffic (wireless data transmission and reception amount) both related to the electronic device  200 . Also, the power state information related to the electronic device  200  can further include a minimum power requirement ratio used for wireless communication of the electronic device  200 . 
     The power control information related to the electronic device  200  can be a set value indicating whether or not the charging of the electronic device  200  is urgent, namely, indicate urgent or normal. As such, the power control information can be set in the electronic device  200  by a user. 
     Referring to  FIG. 19 , the communication unit  150  can receive power information from each of the first and second electronic devices  200   a  and  200   b , and the controller  160  can decide an electronic device, to which power is to be transmitted wirelessly, based upon the received power information. 
     For example, the first electronic device  200   a  can have 11% power residual ratio (current charge amount/total available charge amount) and 10% minimum power requirement ratio used for wireless communication (minimum charge amount used for wireless communication/total available charge amount). Also, the second electronic device  200   b  can have 19% power residual ratio and 20% minimum power requirement ratio used for wireless communication. 
     The controller  160  can decide charging priorities based upon a reference value, which is obtained by dividing the power residual ratio for each electronic device by the minimum power requirement ratio used for wireless communication. In one example, the first electronic device  200   a  has 11/10 as a reference value and the second electronic device  200   b  has 19/20 as a reference value. In this example, the controller  160  can decide the second electronic device  200   b  having the lower reference value as a target electronic device. In another example, if the reference values of the first and second electronic devices  200   a  and  200   b  are all greater than 1, the controller  160  can decide an electronic device, which has first entered a wireless charging service area, as a target electronic device. 
     For example, it is assumed that the wireless data traffic (i.e., the recent wireless data traffic per unit time as of the present time) of the first electronic device  200   a  is 30 mb/day, and the wireless data traffic of the second electronic device  200   b  is 50 mb/day. 
     Here, the controller  160  can decide charging priorities by setting the wireless data traffic as reference values. In one example, the first electronic device  200   a  has the value of 30 as the reference value, and the second electronic device  200   b  has the value of 50 as the reference value. Here, the controller  160  can decide the second electronic device  200   b  having the higher reference value as a target electronic device. 
     Also, for example, it is assumed that whether or not to charge urgently is set to “urgent” with respect to the first electronic device  200   a  and “normal” with respect to the second electronic device  200   b.    
     Here, the controller  160  can decide charging priorities by setting the urgent charging or normal charging as reference values. In one example, the controller  160  can decide the first electronic device  200   a , which is set to “urgent” as to whether or not to charge urgently, as a target electronic device. 
       FIG. 20  is a flowchart showing an operation control process of a wireless charging system in accordance with another embodiment. 
     The communication unit  150  can receive power information from each of the first and second electronic devices  200   a  and  200   b  (S 131 ). 
     The controller  160  can decide one of the first and second electronic devices  200   a  and  200   b  as a target electronic device based upon the power information (S 132 ). 
     The charging unit  110  or  120  can wirelessly transmit power to the target electronic device (S 133 ). 
     Also, the controller  160  can monitor whether or not the wireless power transmission from the charging unit  110  or  120  to the target electronic device is stopped (S 141 ). For example, the controller  160  can monitor whether the charging unit  110  or  120  receives a message indicating that the charging has been completed from the target electronic device or a message indicating that an error has occurred during charging from the target electronic device. 
     If it is monitored that the wireless power transmission to the target electronic device has been stopped (S 142 ), the controller  160  can decide an electronic device, which has not been decided as the target electronic device at the step S 132 , of the first and second electronic devices  200   a  and  200   b , as a new target electronic device (S 143 ). 
     The charging unit  110  or  120  can wirelessly transmit power to the new target electronic device (S 144 ). 
     The wireless charging apparatus disclosed in this specification can provide a wireless charging service to an authenticated electronic device, such that a user can get the wireless charging service more stably. Also, the priorities for the wireless charging service can be controlled based upon power information, such that the user can get the wireless charging service more efficiently. 
     The aforementioned method can be implemented in a recording medium readable by a computer or other similar devices using software, hardware or combination thereof. 
     For a hardware implementation, the embodiments described herein can be implemented within one or more of Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), processors, controllers, micro-controllers, micro processors, other electronic units designed to perform the functions described herein, or a selective combination thereof. In some instances, such embodiments are implemented by the controller  160  of the charging apparatus  100 , or implemented by the controller  280  of the mobile electronic device  200  or the multimedia device  200 ′. 
     For software implementation, the embodiments such as procedures and functions can be implemented together with separate software modules each of which performs at least one of functions and operations. The software codes can be implemented with a software application written in any suitable programming language. Also, the software codes can be stored in the memory  260  and executed by the controller  280 . 
     The foregoing embodiments and advantages are merely exemplary and are not to be construed as limiting the present disclosure. The present teachings can be readily applied to other types of apparatuses. This description is intended to be illustrative, and not to limit the scope of the claims. Many alternatives, modifications, and variations will be apparent to those skilled in the art. The features, structures, methods, and other characteristics of the embodiments described herein can be combined in various ways to obtain additional and/or alternative embodiments. 
     As the present features can be embodied in several forms without departing from the characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalents of such metes and bounds are therefore intended to be embraced by the appended claims.