KR20130003965A - Wireless power transfer for multiple power receivers - Google Patents

Abstract

PURPOSE: Wireless power transmission for multiple electric receivers is provided to control a frequency which is different from the frequency for resonance coupling. CONSTITUTION: A control unit generates a wireless power signal having a first frequency for a first device (200'). The control unit determines whether the interference due to a second device(200) is generated or not. The control unit determines a second frequency if the interference is generated. The interference between the second device and the first device is not generated by the second frequency. The control unit controls the frequency of the wireless power signal to be set as the determined second frequency.

Description

Wireless power transfer for multiple power receivers {WIRELESS POWER TRANSFER FOR MULTIPLE POWER RECEIVERS}

The present disclosure relates to wireless power transfer, and more particularly, to wireless power transfer for a plurality of receivers.

Traditionally, instead of supplying electrical energy by wire to electronic devices, a method of supplying electrical energy wirelessly without contact is recently used. An electronic device that wirelessly receives energy may be directly driven by the received wireless power, or may be charged by using the received wireless power and driven by the charged power.

The present specification is to provide a method for wirelessly delivering power to a plurality of wireless power receivers. In addition, the present specification is to propose a method for determining the power delivery method in the wireless power transmitter according to the power delivery method of the wireless power receiver. In addition, the present specification is to propose a method for changing the frequency in consideration of the interference occurring in the resonant frequency when at least one wireless power receiver for receiving power by the resonance coupling.

In one embodiment, a wireless power transmission apparatus for delivering power in a wireless magnetic resonance method is disclosed. The wireless power transmitter includes a power converter configured to form a wireless power signal; A frequency setting unit for setting a frequency of the wireless power signal; A detector that determines whether interference occurs due to a device within a region where the wireless power signal formed by the power converter arrives; And a control unit configured to cooperate with the power converter, the frequency setting unit, and the detection unit, wherein the control unit forms a wireless power signal set to a first frequency for a first device, and is disposed in the region. It is determined whether the interference due to the device is generated, and if the interference is determined as a result of the determination, determines a second frequency at which the interference between the first device and the second device does not occur, and the frequency of the wireless power signal is determined Can be controlled to set to 2 frequencies.

One or more of the above embodiments may include one or more of the following features.

The detector may detect interference based on a change in a good factor (Q-factor) at the first frequency caused by the second device. The controller may determine that interference occurs when the goodness at the first frequency is less than or equal to a threshold. In addition, the second frequency may be determined as another predetermined frequency. The other predetermined frequency may be a frequency having a predetermined interval from the first frequency.

The determination of the second frequency may include calculating a goodness for each frequency by scanning a frequency within a predetermined band, and determining the second frequency based on the calculated goodness. The frequency determined as the second frequency may be a frequency indicating the greatest goodness of the calculated goodnesses. Or, the determination of the second frequency comprises: selecting one or more discontinuous frequencies of frequencies within the predetermined band; Set the selected frequencies to a frequency of the wireless power signal; Calculate goodness at the selected frequencies; Comparing the calculated goodness levels; As a result of the comparison, the frequency indicating the greatest goodness may be determined as the second frequency.

The power converter may be configured to include a plurality of coils forming the wireless power signal, and the controller may set the frequency of the wireless power signal formed through some of the plurality of coils to the second frequency. In addition, the wireless power signal formed through some of the plurality of coils set to the second frequency may be for delivering power to the second device. The number of coils for forming the wireless power signal set to the second frequency may be determined based on the device information of the second device.

On the other hand, in another embodiment, an electronic device for receiving power in a wireless magnetic resonance method is disclosed. The electronic device may include a power receiver configured to receive a wireless power signal; A frequency setting unit for setting a frequency for receiving the wireless power signal; And a controller configured to cooperate with the power receiver and the frequency setting unit, wherein the controller determines whether a first frequency is used for power transmission to another electronic device, and as a result of the determination, the first frequency is being used. In this case, a second frequency not used by the other device may be determined, and the frequency for receiving the wireless power signal may be set to the determined second frequency.

The other or other embodiments may include one or more of the following features.

The determination of whether the first frequency is used may be based on the strength of the wireless power signal. In addition, the determination of whether the first frequency is used may be based on the goodness at the first frequency.

In addition, the second frequency may be determined as another predetermined frequency. In addition, the other predetermined frequency may be a frequency having a predetermined interval from the first frequency.

The determination of the second frequency may also include: selecting one or more discontinuous frequencies of frequencies within a predetermined band; Determine whether the selected frequencies are used for power transmission to another electronic device; As a result of the determination, one of unused frequencies among the selected frequencies may be determined as the second frequency.

The wireless power transmitter according to the exemplary embodiment disclosed herein may transmit power to one or more wireless power receivers according to a wireless power transfer method of each device.

In addition, the wireless power transmitter according to the exemplary embodiment disclosed herein may avoid an interference phenomenon occurring while transmitting power to one or more wireless power receivers. To this end, the wireless power transmitter may determine whether the preset resonance frequency interferes, determine a new frequency at which the interference does not occur, and transmit power using the determined frequency.

In addition, the wireless power receiver according to the embodiment disclosed in the present disclosure may adjust the frequency such that resonance coupling may be performed through a frequency other than the frequency in use.

1 is an exemplary view conceptually showing a wireless power transmitter and a wireless power receiver according to embodiments of the present invention.
2 (a) and 2 (b) are block diagrams illustrating the configurations of the wireless power transmitter 100 and the wireless power receiver 200 that can be employed in the embodiments disclosed herein, respectively.
3 illustrates a concept of wirelessly transferring power from a wireless power transmitter to a wireless power receiver according to an inductive coupling method.
4 is a block diagram illustrating a part of a configuration of an electromagnetic induction wireless power transmitter and a wireless power receiver employable in the embodiments disclosed herein.
FIG. 5 is a block diagram of a wireless power transmitter configured to have one or more transmitting coils receiving power according to an inductive coupling scheme that may be employed in the embodiments disclosed herein.
6 illustrates a concept in which power is wirelessly transferred from a wireless power transmitter to a wireless power receiver according to a resonance coupling method.
FIG. 7 is a block diagram illustrating a part of a configuration of a wireless power transmitter and a wireless power receiver of a resonance method that may be employed in the embodiments disclosed herein.
8 is a block diagram of a wireless power transmitter configured to have one or more transmitting coils receiving power according to embodiments supporting a resonance coupling scheme.
FIG. 9 is a block diagram showing a wireless power transmission apparatus further including an additional configuration in addition to the configuration shown in FIG. 2 (a).
10 illustrates a configuration when the wireless power receiver according to the embodiments disclosed herein is implemented in the form of a mobile terminal.
FIG. 11 is a conceptual diagram illustrating a method of transferring power to a wireless power receiver by a wireless power transmitter according to a power transfer scheme.
12 is a conceptual diagram illustrating a method of delivering power to one or more wireless power receivers by a wireless power transmitter.
13 illustrates interference occurring between one or more wireless power transmitters.
14 is a flowchart illustrating a method of adjusting a resonance frequency for one or more wireless power receivers according to embodiments of the present specification.

The technique disclosed herein applies to wireless power transfer. However, the technology disclosed herein is not limited thereto, and may be applied to all power transmission systems and methods, wireless charging circuits and methods, and other methods and devices using wirelessly transmitted power to which the technical spirit of the technology may be applied. .

It is noted that the technical terms used herein are used only to describe specific embodiments and are not intended to limit the scope of the technology disclosed herein. Also, the technical terms used herein should be interpreted as being generally understood by those skilled in the art to which the presently disclosed subject matter belongs, unless the context clearly dictates otherwise in this specification, Should not be construed in a broader sense, or interpreted in an oversimplified sense. In addition, when a technical term used in this specification is an erroneous technical term that does not accurately express the concept of the technology disclosed in this specification, it should be understood that technical terms which can be understood by a person skilled in the art are replaced. Also, the general terms used in the present specification should be interpreted in accordance with the predefined or prior context, and should not be construed as being excessively reduced in meaning.

Also, the singular forms "as used herein include plural referents unless the context clearly dictates otherwise. In this specification, terms such as “consisting of” or “comprising” should not be construed as necessarily including all of the various components or steps described in the specification, and some of the components or some steps It should be construed that it may not be included or may further include additional components or steps.

Further, the suffix "module" and "part" for the components used in the present specification are given or mixed in consideration of ease of description, and do not have their own meaning or role.

Furthermore, terms including ordinals such as first, second, etc. used in this specification can be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted.

Further, in the description of the technology disclosed in this specification, a detailed description of related arts will be omitted if it is determined that the gist of the technology disclosed in this specification may be obscured. It is to be noted that the attached drawings are only for the purpose of easily understanding the concept of the technology disclosed in the present specification, and should not be construed as limiting the spirit of the technology by the attached drawings.

Wireless power transmitter and wireless power receiver conceptual diagram

1 is an exemplary view conceptually illustrating a wireless power transmitter and a wireless power receiver according to the embodiments disclosed herein.

As can be seen with reference to Figure 1, the wireless power transmitter 100 may be a power transmission device for wirelessly transmitting the power required to the wireless power receiver 200.

In addition, the wireless power transmitter 100 may be a wireless charging device that charges a battery of the wireless power receiver 200 by transferring power wirelessly.

In addition, the wireless power transmitter 100 may be implemented as various types of devices that deliver power to the wireless power receiver 200 that requires power in a non-contact state.

The wireless power receiver 200 is a device capable of operating by wirelessly receiving power from the wireless power transmitter 100. In addition, the wireless power receiver 200 may charge the battery using the received wireless power.

Meanwhile, the wireless power receiver for wirelessly receiving power described in the present specification includes all portable electronic devices such as an input / output device such as a keyboard, a mouse, an auxiliary output device for video or audio, and a mobile phone, a cellular phone, a smart device. Smart phones, personal digital assistants (PDAs), portable multimedia players (PMPs), tablets, and multimedia devices should be interpreted in a comprehensive sense.

As described below, the wireless power receiver 200 may be a mobile communication terminal (eg, a mobile phone, a cellular phone, a tablet) or a multimedia device. An embodiment in which the wireless power receiver 200 according to the embodiment disclosed herein is implemented in the form of a mobile terminal will be described below with reference to FIG. 10.

The wireless power transmitter 100 may use one or more wireless power transfer methods to wirelessly transfer power to the wireless power receiver 200 without contact with each other. That is, the wireless power transmission apparatus 100 includes an inductive coupling scheme based on an electromagnetic induction phenomenon generated by the wireless power signal, a resonant coupling scheme based on an electromagnetic resonance phenomenon generated by a wireless power signal of a specific frequency, (Electromagnetic Resonance Coupling) method.

The inductively coupled wireless power transmission is a technique for wirelessly transmitting power using a primary coil and a secondary coil. The current is transmitted to the other coil by a varying magnetic field generated by electromagnetic induction in one coil. And the electric power is transmitted.

In the wireless power transmission by the resonance coupling method, electromagnetic resonance occurs in the wireless power receiver 200 by the wireless power signal transmitted from the wireless power transmitter 100, and the wireless phenomenon occurs due to the resonance phenomenon. The power is transmitted from the power transmitter 100 to the wireless power receiver 200.

Hereinafter, embodiments of the wireless power transmitter 100 and the wireless power receiver 200 disclosed herein will be described in detail. The reference numerals added to the components of each of the following drawings are the same as long as the same reference numerals are used as long as they are shown in different drawings.

2 is a block diagram illustrating an exemplary configuration of a wireless power transmitter 100 and a wireless power receiver 200 that may be employed in the embodiments disclosed herein.

Wireless power transmission device

Referring to FIG. 2A, the wireless power transmitter 100 is configured to include a power transmission unit 110. The power transmission unit 110 may include a power conversion unit 111 and a power transmission control unit 112.

The power converter 111 converts the power supplied from the transmission power supply 190 into a wireless power signal and transmits the converted power to the wireless power receiver 200. The wireless power signal transmitted by the power converter 111 is formed in the form of a magnetic field or an electromagnetic field having an oscillation characteristic. To this end, the power converter 111 may be configured to include a coil for generating the wireless power signal.

The power converter 111 may include a component for forming a wireless power signal of a different type according to each power transmission scheme.

In some embodiments, the power converter 111 may be configured to include a primary coil that forms a changing magnetic field to induce a current in the secondary coil of the wireless power receiver 200 according to an inductive coupling method. Can be. Also, in some embodiments, the power converter 111 includes a coil (or antenna) for forming a magnetic field having a specific resonance frequency in order to generate a resonance phenomenon in the wireless power receiver 200 according to a resonance coupling method. It can be configured to.

Also, in some embodiments, the power conversion unit 111 may transmit power using one or more of the above-described inductive coupling method and resonant coupling method. To this end, the wireless power transmitter 100 may determine a power transfer method. In addition, the transmission coil included in the power converter 111 may be implemented to be commonly used for the inductive coupling method and the resonance coupling method.

Among the components included in the power converter 111, those following the inductive coupling method will be described below with reference to FIG. 4, and those following the resonance coupling method will be described below with reference to FIG. 6.

The power conversion unit 111 may further include a circuit for adjusting characteristics of a frequency, an applied voltage, and a current used for forming the wireless power signal.

The power transmission control unit 112 controls each component included in the power transmission unit 110. In some embodiments, the power transmission control 112 may be implemented to be integrated with another control (not shown) that controls the wireless power supply 100.

Meanwhile, an area where the wireless power signal can reach can be divided into two types. First, an active area refers to an area through which a wireless power signal passing power to the wireless power receiver 200 passes. Next, a semi-active area refers to a region of interest in which the wireless power transmitter 100 may detect the existence of the wireless power receiver 200. Here, the power transmission control unit 112 may detect whether the wireless power receiver 200 is placed or removed in the active area or the detection area. Specifically, the power transmission control unit 112 uses the wireless power signal formed by the power conversion unit 111, or the wireless power receiver 200 to the active area or the detection area by a sensor provided separately. It can be detected whether it is deployed.

For example, the power transmission controller 112 is affected by the wireless power signal due to the wireless power receiver 200 present in the sensing area, thereby forming the wireless power signal of the power converter 111. The presence of the wireless power receiver 200 may be detected by monitoring whether a characteristic of power for the power is changed. However, the active area and the sensing area may differ depending on a wireless power transmission scheme such as an inductive coupling scheme and a resonant coupling scheme.

The power transmission control unit 112 may perform a process of identifying the wireless power receiver 200 or determine whether to start wireless power transmission according to a result of detecting the existence of the wireless power receiver 200. have.

The power transmission control unit 112 may determine at least one of a frequency, a voltage, and a current of the power conversion unit 111 for forming the wireless power signal. The determination of the characteristic may be made by the condition of the wireless power transmitter 100 side or by the condition of the wireless power receiver 200 side. In some embodiments, the power transmission control unit 112 may determine the characteristic based on device identification information of the wireless power receiver 200. In some embodiments, the power transmission control unit 112 may determine the characteristic based on the required power information of the wireless power receiver 200 or profile information on the required power.

The power transmission control unit 112 may receive a power control message from the wireless power receiver 200. The power transmission control unit 112 may determine one or more characteristics of the frequency, voltage, and current of the power conversion unit 111 based on the received power control message, and other control based on the power control message. You can perform the operation.

For example, the power transmission control unit 112 may form the wireless power signal according to a power control message including at least one of rectified power amount information, charging state information, and identification information of the wireless power receiver 200. Can be used to determine the characteristics of one or more of the frequencies, currents, and voltages used.

In addition, as another control operation using the power control message, the wireless power transmitter 100 may perform a general control operation related to wireless power transfer based on the power control message. For example, the wireless power transmitter 100 may receive information to be output audibly or visually related to the wireless power receiver 200 or receive information necessary for authentication between devices through the power control message. It may be.

In some embodiments, the power transmission control unit 112 may receive the power control message through the wireless power signal. In some embodiments, the power transmission control unit 112 may receive the power control message through a method of receiving user data.

In order to receive the power control message, the wireless power transmitter 100 may further include a power demodulation / demodulation unit 113 electrically connected to the power converter 111. . The demodulation unit 113 may be used to demodulate the wireless power signal modulated by the wireless power receiver 200 to receive the power control message.

In addition, the power transmission control unit 112 may obtain a power control message by receiving user data including a power control message by a communication means (not shown) included in the wireless power transmitter 100. have.

Meanwhile, the wireless power transmitter 100 according to the embodiments disclosed herein may change a power transfer scheme for the wireless power receiver 200 disposed in the active area or the sensing area.

In addition, the wireless power transmitter 100 may transmit power for one or more wireless power receivers 200. In this case, the wireless power transmitter 100 may determine a power transfer method for each wireless power receiver 200. For example, since the active area and the sensing area may be different according to a wireless power transmission method such as an inductive coupling method and a resonance coupling method, the wireless power transmitter 100 is disposed in the active area or the sensing area of the resonance coupling method. It is possible to determine whether there is a wireless power receiver, or whether there is a wireless power receiver disposed in an active area or a sensing area of an inductive coupling method. According to the determination result, the wireless power transmitter 100 may change a power transfer method for each wireless power receiver.

Wireless power receiver

Referring to FIG. 2B, the wireless power receiver 200 is configured to include a power supply unit 290. The power supply unit 290 supplies power required for the operation of the wireless power receiver 200. The power supply unit 290 may include a power receiving unit 291 and a power receiving control unit 292.

The power receiver 291 receives power transmitted wirelessly from the wireless power transmitter 100.

The power receiver 291 may include components required to receive the wireless power signal according to a wireless power transfer method. In addition, the power receiver 291 may receive power according to one or more wireless power transfer schemes. In this case, the power receiver 291 may include components required for each scheme.

First, the power receiver 291 may be configured to include a coil for receiving a wireless power signal transmitted in the form of a magnetic or electromagnetic field having a vibrating characteristic.

For example, in some embodiments, the power receiving unit 291 may include a secondary coil through which a current is induced by a magnetic field that varies as a component according to an inductive coupling scheme. Also, in some embodiments, the power receiver 291 may include a coil and a resonance circuit in which a resonance phenomenon is generated by a magnetic field having a specific resonance frequency as a component according to a resonance coupling scheme.

However, in some embodiments, the power receiver 291 may receive power according to one or more wireless power transfer schemes. In this case, the power receiver 291 may be configured to receive using one coil, May be implemented to receive using a coil formed differently depending on the power transmission scheme.

Examples of the components included in the power receiver 291 according to the inductive coupling method will be described below with reference to FIG. 4.

Meanwhile, the power receiving unit 291 may further include a rectifier and a regulator for converting the radio power signal into a direct current. The power receiving unit 291 may further include a circuit for preventing an overvoltage or an overcurrent from occurring due to the received power signal.

The power reception control unit 292 controls each component included in the power supply unit 290.

In detail, the power reception control unit 292 may transmit a power control message to the wireless power transmitter 100. The power control message may instruct the wireless power transmitter 100 to start or end the transmission of the wireless power signal. In addition, the power control message may instruct the wireless power transmitter 100 to adjust characteristics of the wireless power signal.

In some embodiments, the power reception control unit 292 may transmit the power control message through the wireless power signal. Also, in some embodiments, the power control unit 292 may transmit the power control message through a method of transmitting through the user data.

In order to transmit the power control message, the wireless power receiver 200 may be configured to further include a power demodulation / demodulation unit 293 electrically connected to the power receiver 291. The modulation and demodulation unit 293 may be used to transmit the power control message through the wireless power signal as in the case of the wireless power transmitter 100 described above. The modulation and demodulation unit 293 may be used as a means for adjusting a current and / or a voltage flowing through the power converter 111 of the wireless power transmitter 100. Hereinafter, a description will be given of a method used by each of the demodulation units 113 and 293 of the wireless power transmitter 100 and the wireless power receiver 200 to transmit and receive a power control message via a wireless power signal. do.

The wireless power signal formed by the power converter 111 is received by the power receiver 291. In this case, the power reception control unit 292 controls the modulation / demodulation unit 293 on the wireless power receiver 200 side to modulate the wireless power signal. For example, the power reception control unit 292 may perform a modulation process so that the amount of power received from the wireless power signal is changed by changing the reactance of the modulation and demodulation unit 293 connected to the power reception unit 291. have. A change in the amount of power received from the wireless power signal results in a change in the current and / or voltage of the power conversion unit 111 forming the wireless power signal. At this time, the demodulation unit 113 on the side of the wireless power transmitter 100 senses a change in current and / or voltage of the power converter 111 and performs a demodulation process.

That is, the power reception control unit 292 generates a packet including a power control message to be transmitted to the wireless power transmitter 100 to modulate the wireless power signal to include the packet, and the power The transmission controller 112 may acquire the power control message included in the packet by decoding the packet based on a result of the demodulation process performed by the modulation / demodulator 113.

In addition, in some embodiments, the power reception control unit 292 controls power by transmitting user data including a power control message by a communication means (not shown) included in the wireless power receiver 200. The message may be transmitted to the wireless power transmitter 100.

In addition, the power supply unit 290 may be configured to further include a charging unit 298 and a battery 299.

The wireless power receiver 200 which is supplied with power for operation from the power supply unit 290 operates by the power delivered from the wireless power transmitter 100 or uses the transferred power to the battery. After charging the battery 299, the battery 299 may operate by power charged in the battery 299. At this time, the power receiving control unit 292 may control the charging unit 298 to perform charging using the transmitted power.

Hereinafter, a wireless power transmitter and a wireless power receiver applicable to the embodiments disclosed herein will be described.

First, according to embodiments supporting the inductive coupling method with reference to FIGS. 3 to 5, a method of transmitting power to the wireless power receiver by the wireless power transmitter is disclosed.

Inductive coupling

3 illustrates a concept of wirelessly transferring power from a wireless power transmitter to a wireless power receiver according to embodiments supporting inductive coupling.

When the power transmission of the wireless power transmission apparatus 100 follows the inductive coupling scheme, when the intensity of the current flowing through the primary coil in the power transmission unit 110 is changed, the primary coil The passing magnetic field changes. The changed magnetic field generates induced electromotive force on the secondary coil side in the wireless power receiver 200.

According to this method, the power converter 111 of the wireless power transmitter 100 is configured to include a transmission coil (Tx coil) 1111a that acts as a primary coil in magnetic induction. In addition, the power receiver 291 of the wireless power receiver 200 is configured to include a Rx coil (2911a) to operate as a secondary coil in magnetic induction.

First, the wireless power transmitter 100 and the wireless power receiver 200 are located such that the transmitting coil 1111a of the wireless power transmitter 100 and the receiving coil of the wireless power receiver 200 are close to each other. Place it. After that, when the power transmission control unit 112 controls the current of the transmitting coil 1111a to be changed, the power receiving unit 291 uses the electromotive force induced in the receiving coil 2911a to provide the wireless power receiver ( 200 to control the power supply.

The efficiency of wireless power transfer by the inductive coupling method has little influence on the frequency characteristics, but alignment between the wireless power transmitter 100 and the wireless power receiver 200 including each coil. And distance.

Meanwhile, the wireless power transmission apparatus 100 may be configured to include an interface surface (not shown) in the form of a flat surface for wireless power transmission by the inductive coupling method. One or more wireless power receivers may be placed on top of the interface surface, and the transmitting coil 1111a may be mounted on the bottom of the interface surface. In this case, a vertical spacing is formed at the lower portion of the interface surface between the mounted transmitting coil 1111a and the receiving coil 2911a of the wireless power receiver 200 located above the interface surface. The distance between the coils is small enough so that the wireless power transfer by the inductive coupling method can be made efficiently.

In addition, an array indicating unit (not shown) indicating a position where the wireless power receiver 200 is placed may be formed on the interface surface. The alignment indicator indicates the position of the wireless power receiver 200 in which an arrangement between the transmitting coil 1111a and the receiving coil 2911a mounted below the interface surface can be suitably made. In some embodiments, the arrangement indicator may be a simple mark. In some embodiments, the arrangement indicator may be formed in the form of a protrusion structure for guiding the position of the wireless power receiver 200. Further, in some embodiments, the alignment indicator is formed in the form of a magnetic body such as a magnet mounted to the lower portion of the interface surface, by mutual attraction with the magnetic material of the other pole mounted inside the wireless power receiver 200. The coils may be guided to achieve a suitable arrangement.

Meanwhile, the wireless power transmission apparatus 100 may be formed to include one or more transmission coils. The wireless power transmitter 100 may increase power transmission efficiency by selectively using a portion of the one or more transmission coils that are suitably arranged with the receiving coil 2911a of the wireless power receiver 200.

Hereinafter, the configuration of the wireless power transmitter and the wireless power receiver of the inductive coupling method applicable to the embodiments disclosed herein will be described in detail.

Inductively coupled wireless power transmitter and wireless power receiver

4 is a block diagram illustrating a part of the configuration of the wireless power transmitter 100 and the wireless power receiver 200 of the electromagnetic induction method that can be employed in the embodiments disclosed herein. A configuration of the power transmitter 110 included in the wireless power transmitter 100 will be described with reference to FIG. 4A, and the wireless power receiver 200 will be described with reference to FIG. 4B. The configuration of the power supply unit 290 included in the following will be described.

Referring to FIG. 4A, the power converter 111 of the wireless power transmitter 100 may be configured to include a transmission coil (Tx coil) 1111a and an inverter 1112.

As described above, the transmitting coil 1111a forms a magnetic field corresponding to the wireless power signal according to the change of the current. In some embodiments, the transmission coil 1111a may be implemented as a planar spiral type. Also, in some embodiments, the transmission coil 1111a may be implemented as a cylindrical solenoid type.

The inverter 1112 transforms a DC input obtained from the power supply unit 190 into an AC waveform. An alternating current deformed by the inverter 1112 is formed in the transmission coil 1111a by driving a resonant circuit including the transmission coil 1111a and a capacitor (not shown) .

In addition, the power conversion unit 111 may be configured to further include a positioning unit 1114.

The positioning unit 1114 may move or rotate the transmitting coil 1111a to increase the efficiency of wireless power transfer by the inductive coupling method. This is because, as described above, the power transfer by the inductive coupling method (alignment) and the distance between the wireless power transmitter 100 and the wireless power receiver 200 including the primary and secondary coils ( distance). In particular, the location determiner 1114 may be used when the wireless power receiver 200 does not exist within an active area of the wireless power transmitter 100.

Therefore, the position determiner 1114 has a distance between the centers of the transmitting coil 1111a of the wireless power transmitter 100 and the receiving coil 2911a of the wireless power receiver 200. A driving unit (not shown) which moves the transmitting coil 1111a to be within a predetermined range, or rotates the transmitting coil 1111a such that the center of the transmitting coil 1111a and the receiving coil 2911a overlap. It can be configured to.

To this end, the wireless power transmitter 100 may further include a position detection unit (not shown) made of a sensor for detecting the position of the wireless power receiver 200, the power transmission control unit 112 may control the location determiner 1114 based on the location information of the wireless power receiver 200 received from the location sensor.

In addition, for this purpose, the power transmission control unit 112 receives control information on the arrangement or distance from the wireless power receiver 200 through the modulation / demodulation unit 113, and controls information on the received arrangement or distance. The positioning unit 1114 may be controlled based on the control.

If the power conversion unit 111 is configured to include a plurality of transmission coils, the positioning unit 1114 can determine which of the plurality of transmission coils is to be used for power transmission.

Meanwhile, the power conversion unit 111 may be configured to further include a power sensing unit 1115. The power sensing unit 1115 on the side of the wireless power transmission apparatus 100 monitors the current or voltage flowing in the transmission coil 1111a. The power sensing unit 1115 detects a voltage or current of a power source supplied from outside and determines whether the detected voltage or current exceeds a threshold value Can be confirmed. The power sensing unit 1115 compares a voltage or current value of the detected power source with a threshold value and outputs a result of the comparison. And a comparator. Based on the result of the detection by the power sensing unit 1115, the power transmission control unit 112 may control the switching unit (not shown) to cut off the power applied to the transmission coil 1111a.

Referring to FIG. 4B, the power supply unit 290 of the wireless power receiver 200 may be configured to include a receiving coil (Rx coil) 2911a and a rectifier circuit 2913.

The current is induced in the receiving coil 2911a by the change in the magnetic field formed from the transmitting coil 1111a. The embodiment of the receiving coil 2911a may be in the form of a flat spiral or a cylindrical solenoid, according to embodiments as in the case of the transmitting coil 1111a.

In addition, series and parallel capacitors may be connected to the receiving coil 2911a to increase reception efficiency of wireless power or to detect resonance.

The receiving coil 2911a may be in the form of a single coil or a plurality of coils.

The rectifier circuit 2913 performs full-wave rectification on the current to convert an alternating current into a direct current. The rectifier circuit 2913 may be implemented as, for example, a full bridge rectifier circuit consisting of four diodes or a circuit using active components.

In addition, the rectifier circuit 2913 may further include a smoothing circuit (regulator) to make the rectified current to a more flat and stable direct current. In addition, the output power of the rectifier circuit 2913 is supplied to each component of the power supply 290. In addition, the rectifier circuit 2913 converts the output DC power to an appropriate voltage to match the power required for each component of the power supply unit 290 (for example, a circuit such as the charging unit 298). (DC-DC converter) may further include.

The modulation and demodulation unit 293 is connected to the power receiver 291, and may be configured as a resistive element having a change in resistance with respect to a DC current, and configured as a capacitive element having a reactance with respect to an alternating current. Can be. The power reception control unit 292 may modulate the wireless power signal received by the power reception unit 291 by changing the resistance or reactance of the modulation and demodulation unit 293.

The power supply unit 290 may further include a power sensing unit 2914. The power sensing unit 2914 of the wireless power receiver 200 monitors the voltage and / or current of the power rectified by the rectifying circuit 2913, and as a result of the monitoring, the voltage and / or voltage of the rectified power. When the current exceeds a threshold, the power reception control unit 292 transmits a power control message to the wireless power transmitter 100 to deliver appropriate power.

Wireless power transmitter comprising one or more transmitting coils

FIG. 5 is a block diagram of a wireless power transmitter configured to have one or more transmitting coils receiving power according to an inductive coupling scheme that may be employed in the embodiments disclosed herein.

Referring to FIG. 5, the power conversion section 111 of the wireless power transmission apparatus 100 according to the embodiments disclosed herein may be configured with one or more transmission coils 1111a-1 to 1111a-n. The one or more transmitting coils 1111a-1 to 1111a-n may be an array of partly overlapping primary coils. An active area may be determined by some of the one or more transmitting coils.

The one or more transmitting coils 1111a-1 to 1111a-n may be mounted below the interface surface. In addition, the power converter 111 may further include a multiplexer 1113 for establishing and releasing connection of some of the one or more transmission coils 1111a-1 to 1111a-n. .

When the position of the wireless power receiver 200 placed on the upper surface of the interface is detected, the power transmission control unit 112 considers the sensed position of the wireless power receiver 200 to determine the one or more transmission coils ( The multiplexer 1113 may be controlled to connect coils which may be in an inductive coupling relationship with the receiving coil 2911a of the wireless power receiver 200 among 1111a-1 to 1111a-n.

To this end, the power transmission control unit 112 may obtain location information of the wireless power receiver 200. In some embodiments, the power transmission control unit 112 acquires the position of the wireless power receiver 200 on the interface surface by the position sensing unit (not shown) included in the wireless power transmitter 100. can do. In another embodiment, the power transmission control unit 112 uses the one or more transmission coils 1111a-1 to 1111a-n to respectively indicate a power control message indicating the strength of a wireless power signal from an object on the interface surface; Obtain location information of the wireless power receiver 200 by receiving a power control message indicating the identification information of the object and determining which one of the one or more transmission coils is close to the location of the one or more transmission coils based on the received result. can do.

On the other hand, the active area is a part of the interface surface, it means a portion that can pass a high-efficiency magnetic field when the wireless power transmitter 100 wirelessly transfers power to the wireless power receiver 200. Can be. In this case, a single transmitting coil or a combination of one or more transmitting coils forming a magnetic field passing through the active region may be referred to as a primary cell. Accordingly, the power transmission control unit 112 determines an active region based on the detected position of the wireless power receiver 200, establishes a connection of a main cell corresponding to the active region, and establishes the wireless power receiver ( The multiplexer 1113 may be controlled such that the receiving coil 2911a of the 200 and the coils belonging to the main cell may be in an inductive coupling relationship.

Meanwhile, when one or more wireless power receivers 200 are disposed on an interface surface of the wireless power transmitter 100 configured to include the one or more transmission coils 1111a-1 to 1111a-n, the power transmission. The controller 112 may control the multiplexer 1113 so that coils belonging to a main cell corresponding to the position of each wireless power receiver are in inductive coupling relationship. Thus, the wireless power transmitter 100 may wirelessly transmit power to one or more wireless power receivers by forming wireless power signals using different coils.

In addition, the power transmission control unit 112 may be configured to supply power having different characteristics to coils corresponding to the wireless power receivers. In this case, the wireless power transmitter 100 may transmit power by setting different power transfer methods, efficiency, characteristics, etc. for each wireless power receiver.

The power converter 111 may further include an impedance matching unit (not shown) for adjusting the impedance to form a resonant circuit with the connected coils.

Hereinafter, a method of transmitting power by a wireless power transmission apparatus in accordance with embodiments that support a resonant coupling scheme is described with reference to FIGS.

Resonant coupling method

6 illustrates a concept in which power is wirelessly transmitted from a wireless power transmitter to a wireless power receiver according to embodiments supporting a resonance coupling scheme.

First, the resonance (or resonance) will be briefly described as follows. Resonance refers to a phenomenon in which the vibration system receives a periodic external force having the same frequency as its natural frequency, and the amplitude increases markedly. Resonance is a phenomenon that occurs in all vibrations, including mechanical and electrical vibrations. In general, when a force capable of vibrating the vibration system from the outside, if the natural frequency of the vibration system and the frequency of the force applied from the outside is the same, the vibration is severe and the amplitude is also large.

In the same principle, when a plurality of vibrating bodies that are separated within a certain distance vibrate at the same frequency with each other, the plurality of vibrating bodies resonate with each other, in which case the resistance between the plurality of vibrating bodies decreases. In an electric circuit, an inductor and a capacitor can be used to make a resonant circuit.

When the power transmission of the wireless power transmitter 100 follows the resonance coupling method, the magnetic field having a specific vibration frequency is formed by the AC power in the power transmission unit 110. When a resonance phenomenon occurs in the wireless power receiver 200 by the formed magnetic field, power is generated in the wireless power receiver 200 by the resonance phenomenon.

The resonance frequency may be determined by, for example, the following equation (1).

Here, the resonance frequency f is determined by the inductance L and the capacitance C in the circuit. In a circuit for forming a magnetic field using a coil, the inductance is determined by the number of revolutions of the coil and the like, and the capacitance can be determined by an interval, an area, or the like between the coils. In order to determine the resonance frequency, a capacitive resonance circuit other than the coil may be configured to be connected.

Referring to FIG. 6, in the case of embodiments in which power is wirelessly transmitted according to a resonance coupling method, the power converter 111 of the wireless power transmitter 100 may include a transmission coil (Tx coil) in which a magnetic field is formed. 1111b and a resonant circuit 1116 connected to the transmitting coil 1111b and configured to determine a specific vibration frequency. The resonant circuit 1116 may be implemented using capacitors, and the specific vibration frequency is determined based on the inductance of the transmission coil 1111b and the capacitance of the resonant circuit 1116.

The circuit element of the resonant circuit 1116 may be configured in various forms so that the power converter 111 may form a magnetic field, and may be connected in parallel with the transmission coil 1111b as shown in FIG. 6. It is not limited.

In addition, the power receiver 291 of the wireless power receiver 200 includes a resonance circuit 2912 and a Rx coil configured to cause a resonance phenomenon by a magnetic field formed in the wireless power transmitter 100. (2911b). That is, the resonant circuit 2912 may also be implemented using a capacitive circuit, and the resonant circuit 2912 is determined based on the inductance of the receiving coil 2911b and the capacitance of the resonant circuit 2912. The resonance frequency is configured to be equal to the resonance frequency of the formed magnetic field.

 The circuit element of the resonant circuit 2912 may be configured in various forms such that the power receiver 291 may cause resonance by the magnetic field, and is connected in series with the receiving coil 2911b as shown in FIG. 6. It is not limited in form.

The specific vibration frequency in the wireless power transmitter 100 may be obtained using Equation 1 with L _Tx and C _Tx . Here, when the result of substituting L _RX and C _RX of the wireless power receiver 200 into Equation 1 is equal to the specific vibration frequency, resonance occurs in the wireless power receiver 200.

According to embodiments supporting the wireless power transmission method by resonance coupling, when the wireless power transmitter 100 and the wireless power receiver 200 resonate at the same frequency, the electromagnetic waves are transmitted through the near field. If the frequencies are different, there is no energy transfer between the devices.

Therefore, the efficiency of the wireless power transfer by the resonance coupling method has a large influence on the frequency characteristic, while the arrangement between the wireless power transmitter 100 and the wireless power receiver 200 including each coil and The effect of distance is relatively small compared to inductive coupling.

Hereinafter, the configuration of the wireless power transmitter and the wireless power receiver of the resonance coupling method applicable to the embodiments disclosed herein will be described in detail.

Resonant Coupling Wireless Power Transmitter

FIG. 7 is a block diagram exemplarily illustrating a part of the configuration of the wireless power transmitter 100 and the wireless power receiver 200 of the resonance method that may be employed in the embodiments disclosed herein.

A configuration of the power transmission unit 110 included in the wireless power transmitter 100 will be described with reference to FIG. 7A.

The power converter 111 of the wireless power transmitter 100 may be configured to include a transmission coil (Tx coil) 1111b, an inverter 1112, and a resonant circuit 1116. The inverter 1112 may be configured to be connected to the transmitting coil 1111b and the resonant circuit 1116.

The transmitting coil 1111b may be mounted separately from the transmitting coil 1111a for transmitting power according to the inductive coupling method, but may also be configured to transmit power in an inductive coupling method and a resonance coupling method using one single coil.

The transmitting coil 1111b forms a magnetic field for transferring power, as described above. When the AC coil is applied to the transmission coil 1111b and the resonant circuit 1116, vibration may occur. In this case, the vibration frequency is based on the inductance of the transmission coil 1111b and the capacitance of the resonant circuit 1116. Can be determined.

To this end, the inverter 1112 transforms the DC input obtained from the power supply unit 190 into an AC waveform, and the modified AC current is applied to the transmission coil 1111b and the resonance circuit 1116.

In addition, the power converter 111 may be configured to further include a frequency adjuster 1117 for changing the resonance frequency value of the power converter 111. Since the resonant frequency of the power converter 111 is determined based on inductance and capacitance in the circuit constituting the power converter 111 by Equation 1, the power transmission controller 112 is the inductance and / or The resonance frequency of the power converter 111 may be determined by controlling the frequency adjusting unit 1117 to change the capacitance.

In some embodiments, the frequency adjusting unit 1117 may be configured to include a motor capable of changing capacitance by adjusting a distance between capacitors included in the resonant circuit 1116. In addition, in some embodiments, the frequency adjusting unit 1117 may be configured to include a motor that can change the inductance by adjusting the number of turns or diameter of the transmission coil 1111b. Also, in some embodiments, the frequency adjuster 1117 may be configured to include active elements that determine the capacitance and / or inductance.

On the other hand, the power converter 111 may be configured to further include a power sensing unit 1115. Operation of the power sensing unit 1115 is the same as described above.

Meanwhile, according to embodiments of the present disclosure, a wireless power transmitter that transmits power to one or more wireless power receivers may be implemented in the form of a wireless charger. The wireless charger may include a power converter 111 forming a wireless power signal; A frequency setting unit (1117) for setting a frequency of the wireless power signal; A detector configured to determine whether interference occurs due to the wireless power receiver 200 disposed in an active area or a detection area; And a controller 112 configured to cooperate with the power converter, the frequency setter, and the detector. The detector may be implemented in the same unit as the controller 112. An example in which the wireless power transmitter is implemented in the form of a wireless charger will be described below with reference to FIG. 9.

A configuration of the power supply unit 290 included in the wireless power receiver 200 will be described with reference to FIG. 7B. As described above, the power supply unit 290 may be configured to include the Rx coil 2911b and the resonant circuit 2912.

In addition, the power receiver 291 of the power supply unit 290 may be configured to further include a rectifier circuit 2913 for converting the alternating current generated by the resonance phenomenon into a direct current. The rectifier circuit 2913 may be configured in the same manner as described above.

In addition, the power receiver 291 may be configured to further include a power sensing unit 2914 for monitoring the voltage and / or current of the rectified power. The power sensing unit 2914 may be configured in the same manner as described above.

Wireless power transmitter comprising one or more transmitting coils

8 is a block diagram of a wireless power transmission apparatus configured to have one or more transmission coils that receive power in accordance with embodiments that support a resonant coupling scheme.

Referring to FIG. 8, the power conversion unit 111 of the wireless power transmitter 100 according to the embodiments disclosed herein is connected to one or more transmission coils 1111b-1 to 1111b-n and respective transmission coils. It may be configured to include the resonant circuit (1116-1 to 1116-n). In addition, the power converter 111 may further include a multiplexer 1113 for establishing and releasing connection of some of the one or more transmission coils 1111b-1 to 1111b-n. .

The one or more transmission coils 1111b-1 to 1111b-n may be set to have the same resonance frequency. In some embodiments, some of the one or more transmitting coils 1111b-1 to 1111b-n may be set to have different resonance frequencies, which are the one or more transmitting coils 1111b-1 to 1111b-n. Is determined according to what inductance and / or capacitance the resonant circuits 1116-1 to 1116-n, respectively, are connected to.

Meanwhile, when one or more wireless power receivers 200 are disposed in an active area or a sensing area of the wireless power transmitter 100 configured to include the one or more transmission coils 1111b-1 to 1111b-n, The power transmission control unit 112 may control the multiplexer 1113 to be in a different resonance coupling relationship for each wireless power receiver. Thus, the wireless power transmitter 100 may wirelessly transmit power to one or more wireless power receivers by forming wireless power signals using different coils.

In addition, the power transmission control unit 112 may be configured to supply power having different characteristics to coils corresponding to the wireless power receivers. In this case, the wireless power transmitter 100 may transmit power by setting different power transmission schemes, resonant frequencies, efficiencies, and characteristics for each wireless power receiver.

To this end, the frequency adjusting unit 1117 may change inductance and / or capacitance of the resonant circuits 1116-1 to 1116-n respectively connected to the one or more transmission coils 1111b-1 to 1111b-n. It can be configured to be.

Wireless power transmitter implemented as a charger

Meanwhile, an example of the wireless power transmission apparatus implemented in the form of a wireless charger will be described below.

FIG. 9 is a block diagram illustrating a wireless power transmitter further including an additional configuration in addition to the configuration illustrated in FIG. 2A.

9, the wireless power transmission apparatus 100 includes a power transmission unit 110 and a power supply unit 190 that support at least one of the inductive coupling method and the resonant coupling method described above, And may further include a sensor unit 120, a communication unit 130, an output unit 140, a memory 150, and a control unit 180.

The control unit 180 controls the power conversion unit 110, the sensor unit 120, the communication unit 130, the output unit 140, the memory 150, and the power supply unit 190.

The controller 180 may be implemented as a separate module or a single module from the power transmission controller 112 in the power converter 110 described with reference to FIG. 2.

The sensor unit 120 may be configured to include a sensor for detecting a position of the wireless power receiver 200. The position information sensed by the sensor unit 120 may be used to allow the power conversion unit 110 to efficiently transmit power.

For example, in the case of wireless power transmission according to embodiments that support inductive coupling, the sensor unit 120 may operate as a position sensing unit, and the position information sensed by the sensor unit 120 may be And may be used to move or rotate the transmission coil 1111a in the power conversion unit 110. [

In addition, for example, the wireless power transmitter 100 according to the embodiments including the one or more transmission coils described above may be configured based on the location information of the wireless power receiver 200. Coils that may be in an inductive coupling relationship or a resonance coupling relationship with the receiving coil of the wireless power receiver 200 may be determined.

Meanwhile, the sensor unit 120 may be configured to monitor whether the wireless power receiver 200 approaches a chargeable area. An access detection function of the sensor unit 120 may be performed separately or in combination with a function of detecting the access of the wireless power receiver 200 by the power transmission control unit 112 in the power transmission unit 110. Can be.

The communication unit 130 performs wired and wireless data communication with the wireless power receiver 200. The communication unit 130 may include an electronic component for any one or more of Bluetooth ^TM , Zigbee, Ultra Wide Band (UWB), Wireless USB, Near Field Communication (NFC), and Wireless LAN.

The output unit 140 includes at least one of a display unit 141 and an audio output unit 142. The display unit 141 may be a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED) a flexible display, and a 3D display. The display unit 141 may display a state of charge according to the control of the controller 180.

The memory 150 may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory) (Random Access Memory), a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM) A magnetic disk, and / or an optical disk. The wireless power transmission apparatus 100 may operate in association with a web storage that performs a storage function of the memory 150 on the Internet. The memory 150 may store programs or commands that perform the above-described functions of the wireless power transmission apparatus 100. [ The controller 180 may execute programs or commands stored in the memory 150 to transmit power wirelessly. Other components (e.g., controller 180) included in the wireless power transmission apparatus 100 may use a memory controller (not shown) to access the memory 150. [

The configuration of the wireless power transmitter according to the exemplary embodiment disclosed above may be applied to devices such as docking stations, terminal cradle devices, and other electronic devices, except when applicable only to the wireless charger. It will be apparent to those skilled in the art that the present invention may be used.

Wireless power receiver implemented as a mobile terminal

10 illustrates a configuration when the wireless power receiver 200 according to the embodiments disclosed herein is implemented in the form of a mobile terminal.

The mobile communication terminal 200 includes a power supply unit 290 illustrated in FIG. 2, 4, or 7.

The terminal 200 includes a wireless communication unit 210, an audio / video input unit 220, a user input unit 230, a sensing unit 240, an output unit 250, a memory 260, An interface unit 270, and a control unit 280. The components shown in FIG. 10 are not essential, so a terminal having more or fewer components may be implemented.

Hereinafter, the components will be described in order.

The wireless communication unit 210 can perform wireless communication between the terminal 200 and the wireless communication system or between the terminal 200 and the network where the terminal 200 is located or between the terminal 200 and the wireless power transmission apparatus 100 One or more modules. For example, the wireless communication unit 210 may include a broadcast receiving module 211, a mobile communication module 212, a wireless Internet module 213, a short distance communication module 214, and a location information module 215 .

The broadcast receiving module 211 receives broadcast signals and / or broadcast-related information from an external broadcast center through a broadcast channel.

The broadcast channel may include a satellite channel and a terrestrial channel. The broadcast center may refer to a server that generates and transmits a broadcast signal and / or broadcast related information or a server that receives a previously generated broadcast signal and / or broadcast related information and transmits the same to a terminal. The broadcast signal may include a TV broadcast signal, a radio broadcast signal, a data broadcast signal, and a broadcast signal in which a data broadcast signal is combined with a TV broadcast signal or a radio broadcast signal.

The broadcast-related information may refer to a broadcast channel, a broadcast program, or information related to a broadcast service provider. The broadcast related information may also be provided through a mobile communication network. In this case, it may be received by the mobile communication module 212.

The broadcast related information may exist in various forms. For example, it may exist in the form of Electronic Program Guide (EPG) of Digital Multimedia Broadcasting (DMB) or Electronic Service Guide (ESG) of Digital Video Broadcast-Handheld (DVB-H).

For example, the broadcast receiving module 211 may be a Digital Multimedia Broadcasting-Terrestrial (DMB-T), a Digital Multimedia Broadcasting-Satellite (DMB-S), a Media Forward Link Only (DVF-H) And a Digital Broadcasting System (ISDB-T) (Integrated Services Digital Broadcast-Terrestrial). Of course, the broadcast receiving module 211 may be configured to be suitable for not only the above-described digital broadcast system but also other broadcast systems.

The broadcast signal and / or broadcast related information received through the broadcast receiving module 211 may be stored in the memory 260.

The mobile communication module 212 transmits and receives a radio signal to at least one of a base station, an external terminal, and a server on a mobile communication network. The wireless signal may include various types of data depending on a voice call signal, a video call signal or a text / multimedia message transmission / reception.

The wireless Internet module 213 is a module for wireless Internet access, and may be built in or externally attached to the terminal 200. Wireless Internet technologies may include Wireless LAN (Wi-Fi), Wireless Broadband (Wibro), World Interoperability for Microwave Access (Wimax), High Speed Downlink Packet Access (HSDPA), and the like.

The short range communication module 214 refers to a module for short range communication. As a wireless short range communication technology, Bluetooth, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, and the like may be used. On the other hand, a wired local area communication may be used, such as Universal Serial Bus (USB), IEEE 1394, Thunderbolt ( ^TM ), and the like.

The wireless Internet module 213 or the local area communication module 214 may establish a data communication connection with the wireless power transmission apparatus 100.

Through the established data communication, when there is an audio signal to be output while the wireless Internet module 213 or the short-range communication module 214 is transmitting power wirelessly, the audio signal is transmitted through the short- To the wireless power transmission apparatus 100. The wireless Internet module 213 or the local area communication module 214 may transmit the information to the wireless power transmission apparatus 100 through the established data communication. Alternatively, through the established data communication, the wireless Internet module 213 or the short-range communication module 214 may receive an audio signal input through a microphone built in the wireless power transmission apparatus 100. [ The wireless Internet module 213 or the local area communication module 214 may transmit identification information (e.g., a telephone number or a device name in the case of a mobile phone) of the mobile terminal 200 to the wireless power To the transmission apparatus 100.

The position information module 215 is a module for acquiring the position of the terminal, for example, a Global Position System (GPS) module.

Referring to FIG. 10, an A / V (Audio / Video) input unit 220 is for inputting an audio signal or a video signal, and may include a camera 221 and a microphone 222. The camera 221 processes an image frame such as a still image or a video obtained by an image sensor in a video call mode or a photographing mode. The processed image frame can be displayed on the display unit 251. [

The image frame processed by the camera 221 may be stored in the memory 260 or transmitted to the outside through the wireless communication unit 210. At least two cameras 221 may be provided depending on the use environment.

The microphone 222 receives an external sound signal by a microphone in a communication mode, a recording mode, a voice recognition mode, or the like, and processes it as electrical voice data. The processed voice data may be converted into a form that can be transmitted to the mobile communication base station through the mobile communication module 212 when the voice data is in the call mode, and output. Various noise elimination algorithms may be implemented in the microphone 222 to remove noise generated in receiving an external sound signal.

The user input unit 230 generates input data for the user to control the operation of the terminal. The user input unit 230 may include a key pad dome switch, a touch pad (static / static), a jog wheel, a jog switch, and the like.

The sensing unit 240 may include a proximity sensor 241, a pressure sensor 242, a motion sensor 243, and the like. The proximity sensor 241 can detect an object approaching the mobile terminal 200 or the presence of an object in the vicinity of the mobile terminal 200 without mechanical contact. The proximity sensor 241 can detect a nearby object by using the change of the alternating magnetic field or the change of the static magnetic field, or the rate of change of the capacitance. The proximity sensor 241 may be provided with two or more according to the configuration aspect.

The pressure sensor 242 can detect whether pressure is applied to the mobile terminal 200, the magnitude of the pressure, and the like. The pressure sensor 242 may be installed at a position where the pressure of the mobile terminal 200 needs to be detected according to the use environment. If the pressure sensor 242 is installed on the display unit 251, a touch input through the display unit 251 and a pressure greater than a touch input To identify the applied pressure touch input. In addition, the magnitude of the pressure applied to the display unit 251 when the pressure touch is input can be determined according to the signal output from the pressure sensor 242.

The motion sensor 243 detects the position or movement of the mobile terminal 200 using an acceleration sensor, a gyro sensor, or the like. An acceleration sensor that can be used in the motion sensor 243 is an element that converts an acceleration change in one direction into an electric signal. Acceleration sensors are usually constructed by mounting two or three axes in one package. Depending on the usage environment, only one axis of Z axis is required. Therefore, when the acceleration sensor in the X-axis direction or the Y-axis direction is used instead of the Z-axis direction for some reason, the acceleration sensor may be mounted on the main substrate by using a separate piece substrate. In addition, the gyro sensor is a sensor for measuring the angular velocity of the mobile terminal 200, which is rotating, and can sense a rotated angle with respect to each reference direction. For example, the gyro sensor may detect respective rotation angles, ie, azimuth, pitch, and roll, based on three axes.

The output unit 250 includes a display unit 251, an audio output module 252, an alarm unit 253, a haptic module 254, and the like, for generating output related to visual, auditory, .

The display unit 251 displays (outputs) information processed by the terminal 200. [ For example, when the terminal is in the call mode, the terminal displays a user interface (UI) or a graphic user interface (GUI) related to the call. When the terminal 200 is in a video call mode or a photographing mode, the terminal 200 displays a photographed and / or received image, a UI, or a GUI.

The display unit 251 may be a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED) display, and a 3D display.

Some of these displays may be transparent or light transmissive so that they can be seen through. This may be referred to as a transparent display. A representative example of the transparent display is TOLED (Transparent OLED). The rear structure of the display unit 251 may also be configured as a light transmissive structure. With this structure, the user can see an object located behind the terminal body through the area occupied by the display unit 251 of the terminal body.

There may be two or more display units 251 according to the embodiment of the terminal 200. For example, in the terminal 200, a plurality of display units may be spaced apart from one another or may be disposed integrally with each other, or may be disposed on different surfaces.

(Hereinafter, referred to as a 'touch screen') in which a display unit 251 and a sensor (hereinafter, referred to as a 'touch sensor') for sensing a touch operation form a mutual layer structure, It can also be used as an input device. The touch sensor may have the form of, for example, a touch film, a touch sheet, a touch pad, or the like.

The touch sensor may be configured to convert a change in a pressure applied to a specific portion of the display portion 251 or a capacitance generated in a specific portion of the display portion 251 to an electrical input signal. The touch sensor can be configured to detect not only the position and area to be touched but also the pressure at the time of touch.

If there is a touch input to the touch sensor, the corresponding signal (s) is sent to the touch controller. The touch controller processes the signal (s) and then transmits the corresponding data to the controller 280. Thus, the control unit 280 can know which area of the display unit 251 is touched or the like.

A proximity sensor 241 may be disposed in an inner region of the terminal to be wrapped by the touch screen or in the vicinity of the touch screen. The proximity sensor refers to a sensor that detects the presence or absence of an object approaching a predetermined detection surface or a nearby object without mechanical contact using the force of an electromagnetic field or infrared rays. The proximity sensor has a longer life span than the contact sensor and its utilization is also high.

Examples of the proximity sensor include a transmission photoelectric sensor, a direct reflection photoelectric sensor, a mirror reflection photoelectric sensor, a high frequency oscillation proximity sensor, a capacitive proximity sensor, a magnetic proximity sensor, and an infrared proximity sensor. And to detect the proximity of the pointer by the change of the electric field along the proximity of the pointer when the touch screen is electrostatic. In this case, the touch screen (touch sensor) may be classified as a proximity sensor.

Hereinafter, for convenience of explanation, the act of allowing the pointer to be recognized without being in contact with the touch screen so that the pointer is located on the touch screen is referred to as a "proximity touch", and the touch The act of actually touching the pointer on the screen is called "contact touch." The position where the pointer is proximately touched on the touch screen means a position where the pointer is vertically corresponding to the touch screen when the pointer is touched.

The proximity sensor detects a proximity touch and a proximity touch pattern (e.g., a proximity touch distance, a proximity touch direction, a proximity touch speed, a proximity touch time, a proximity touch position, a proximity touch movement state, and the like). Information corresponding to the detected proximity touch operation and the proximity touch pattern may be output on 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 signal reception mode, a call mode or a recording mode, a voice recognition mode, a broadcast reception mode, The sound output module 252 may also output a sound signal related to a function (for example, a call signal reception sound or a message reception sound) performed in the terminal 200. The sound output module 252 may include a receiver, a speaker, a buzzer, and the like.

The alarm unit 253 outputs a signal for notifying the terminal 200 of an event occurrence. Examples of events generated in the terminal include call signal reception, message reception, key signal input, and touch input. The alarm unit 253 may output a signal for informing occurrence of an event in a form other than the video signal or the audio signal, for example, vibration. The video signal or the audio signal may be output through the display unit 251 or the audio output module 252 so that they may be classified as a part of the alarm unit 253.

The haptic module 254 generates various tactile effects that the user can feel. A typical example of the haptic effect generated by the haptic module 254 is vibration. The intensity and pattern of the vibration generated by the hit module 254 and the like are controllable. For example, different vibrations may be synthesized and output or sequentially output.

In addition to vibration, the haptic module 254 can be used for a variety of applications including, but not limited to, a pin arrangement vertically moving with respect to the contact skin surface, a spraying force or suction force of the air through the injection port or the suction port, And various tactile effects such as an effect of reproducing a cold sensation using an endothermic or exothermic element can be generated.

The haptic module 254 can be implemented not only to transmit the tactile effect through direct contact but also to allow the user to feel the tactile effect through the muscular sensation of the finger or arm. The haptic module 254 may include two or more haptic modules according to the configuration of the terminal 200.

The memory 260 may store a program for the operation of the control unit 280 and temporarily store input / output data (e.g., a phone book, a message, a still image, a moving picture, etc.). The memory 260 may store data on vibration and sound of various patterns output when a touch is input on the touch screen.

In some embodiments, the memory 260 may include an operating system (not shown), a module that performs the function of the wireless communication unit 210, a module that operates in conjunction with the user input unit 230, an A / V input unit 220, A module that operates in conjunction with the output module 250, and a module that operates in conjunction with the output module 250. The operating system (e.g., LINUX, UNIX, OS X, WINDOWS, Chrome, Symbian, iOS, Android, Bada, VxWorks or other embedded operating systems) is used to control system tasks such as memory management, power management, etc. It may include various software components and / or drivers.

The memory 260 may also store a configuration program associated with wireless power transmission or wireless charging. The setting program may be executed by the control unit 280. [

In addition, the memory 260 may store an application related to wireless power transmission (or wireless charging) downloaded from an application providing server (e.g., an application store). The wireless power transmission related application is a program for controlling wireless power transmission, and the wireless power receiver 200 wirelessly receives power from the wireless power transmitter 100 through the corresponding program or the wireless power transmitter. A connection for data communication with 100 may be established.

The memory 260 may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (e.g., SD or xD memory), a RAM (Random Access Memory), SRAM (Static Random Access Memory), ROM (Read Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), PROM A disk, and / or an optical disk. The terminal 200 may operate in association with a web storage that performs the storage function of the memory 260 on the Internet.

The interface unit 270 serves as a path for communication with all external devices connected to the terminal 200. The interface unit 270 receives data from an external device or supplies power to each component in the terminal 200 or transmits data in the terminal 200 to an external device. For example, a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device having an identification module, an audio I / O port, A video input / output (I / O) port, an earphone port, and the like may be included in the interface unit 270.

The identification module is a chip for storing various information for authenticating the usage right of the terminal 200 and includes a user identification module (UIM), a subscriber identity module (SIM), a universal user authentication module A Subscriber Identity Module (USIM), and the like. Devices with identification modules (hereinafter referred to as "identification devices") can be manufactured in a smart card format. Accordingly, the identification device can be connected to the terminal 200 through the port.

When the terminal 200 is connected to an external cradle, the interface unit may be a path through which the power from the cradle is supplied to the terminal 200, or various command signals input from the cradle by the user are transmitted to the terminal . Various command signals or power input from the cradle may be operated as signals for recognizing that the terminal is correctly mounted on the cradle.

The controller 280 typically controls the overall operation of the terminal. For example, voice communication, data communication, video communication, and the like. The control unit 280 may include a multimedia module 281 for multimedia playback. The multimedia module 281 may be implemented in the control unit 280 or may be implemented separately from the control unit 280. In addition, the controller 180 may be implemented as a separate module or a single module from the power receiving control unit 292 in the power supply unit 290 described with reference to FIG. 2.

The control unit 280 may perform pattern recognition processing to recognize handwriting input or drawing input performed on the touch screen as characters and images, respectively.

The control unit 280 performs wired charging or wireless charging according to a user input or an internal input. Herein, the internal input is a signal indicating that the induced current generated in the secondary coil in the terminal is detected.

As described above, the power reception control unit 292 in the power supply unit 290 may be included in the control unit 280, and operation by the power reception control unit 292 may be performed by the control unit 280 ) Can be understood as being performed.

The power supply unit 290 receives an external power source and / or an internal power source under the control of the controller 280 to supply power for operation of each component.

The power supply unit 290 may include a battery 299 for supplying power to each component of the terminal 200 and may include a charging unit 298 for wired or wirelessly charging the battery 299.

Although the present specification discloses a mobile terminal as an example of a device for receiving power wirelessly, the configuration according to the embodiments described herein may be applied to a fixed terminal such as a digital TV, a desktop computer, It will be readily apparent to those skilled in the art that the present invention may be applied to the present invention.

Choice of power delivery method

The wireless power transmitter 100 according to the exemplary embodiments disclosed herein may change a power transmission scheme for the wireless power receiver 200 disposed in the active area or the sensing area.

FIG. 11 is a conceptual diagram illustrating a method of transferring power to a wireless power receiver by a wireless power transmitter according to a power transfer scheme.

The wireless power transmitter 100 may transmit power for one or more wireless power receivers 200 and 200 '. In this case, the wireless power transmitter 100 may determine a power transmission method for each wireless power receiver 200, 200 ′.

Meanwhile, the active area and the sensing area may be different depending on the wireless power transmission method such as the inductive coupling method and the resonance coupling method. Accordingly, the wireless power transmitter 100 may include a wireless power receiver disposed in an active area or a sensing area of a resonance coupling method, or a wireless power receiver disposed in an active area or a sensing area of an inductive coupling method. It can be determined whether it exists. According to the determination result, the wireless power transmitter 100 may change a power transfer method for each wireless power receiver.

Referring to FIG. 11, for example, a first device 200 ′ receiving power in an inductive coupling scheme and a second device 200 receiving power in a resonance coupling scheme may be connected to the wireless power transmitter 100. Are arranged together. The interface surface 160 of the wireless power transmitter 100 may correspond to an active region of inductive coupling. Accordingly, the wireless power transmitter 100 may transmit power according to an inductive coupling method for the first device 200 ′ disposed on the interface surface 160. In addition, the wireless power transmitter 100 may transmit power according to the resonance coupling method for the second device 200 in the active region 410 of the resonance coupling method.

Determination of Resonant Frequency

Hereinafter, a method of delivering power in a resonant manner by adjusting a resonant frequency for one or more wireless power receivers according to embodiments of the present disclosure.

12 is a conceptual diagram illustrating a method of delivering power to one or more wireless power receivers by a wireless power transmitter. Referring to FIG. 12, the wireless power transmitter 100 may be implemented in the form of a wireless charger 100 that transmits power to one or more wireless power receivers 200 and 200 ′.

The wireless charger 100, as shown in Figure 9, the power conversion unit 111 for forming a wireless power signal; A frequency setting unit (1117) for setting a frequency of the wireless power signal; A detector configured to determine whether interference occurs due to the wireless power receiver 200 disposed in a specific area 410 (eg, an active area or a detection area); And a controller 112 for controlling the internal components of the wireless charger 100. The detector may be implemented in the same unit as the controller 112.

Referring to FIG. 12, the wireless charger 100 first transmits power by forming a wireless power signal set to a first frequency for the first device 200 ′. The first frequency may be a frequency set as a default for wireless power transmission or may be a frequency determined by negotiation between the wireless charger 100 and the first device 200 ′. The first frequency may be a resonance frequency for transmitting power by the wireless charger 100 and the first device 200 ′ by a resonance coupling method.

Here, a wireless power receiver (such as the first device 200 ′ and the second device 200) according to the embodiments disclosed herein includes a power receiver 291 for receiving the wireless power signal, the wireless power signal. It may be implemented to include a frequency setting unit 2912 for setting a frequency for receiving the, and a control unit 292 for controlling the internal components of the wireless power receiver.

When the second device 200 is disposed in the area 410 while transmitting power through the wireless power signal set to the first frequency, the frequency of the second device 200 causes the first device to run at the first frequency. Interference may occur in the set wireless power signal. 13 illustrates interference occurring between one or more wireless power transmitters. The first frequency may correspond to a resonance frequency between the wireless charger 100 and the first device 200 ′ in which wireless power transmission is performed through the wireless power signal set to the first frequency. However, when another object, that is, the second device 200 is newly disposed in the area 410 where the wireless power signal arrives, the characteristic indicating the frequency gain may vary by the second device 200.

Referring to FIG. 13, for example, a quality factor (Q-Factor) that can be calculated from a frequency gain due to mutual interference generated by the second device 200 is changed, and thus, at a center frequency. It is characteristic of the form 450 that the gain is reduced. At this time, the wireless charger 100 senses the goodness at the first frequency that is currently set to the resonance frequency, and determines that interference occurs when the goodness at the first frequency is below a threshold. can do.

The wireless charger 100 determines another frequency at which interference does not occur between the first device 200 ′ and the second device 200 when interference occurs at the first frequency, and thus a wireless power signal formed thereafter. Respectively, the determined other frequency is set to be a resonant frequency for the first device and the second device.

Referring to the frequency gain curve 460 of FIG. 13 when the wireless charger 100 newly sets a frequency so that interference does not occur, the second frequency is a frequency whose gain exceeds a threshold, or It may represent the frequency at which the gain exceeds the threshold and corresponds to the peak of the frequency gain curve, or the frequency at which the gain is maximum.

In some embodiments, the second frequency may be determined as another predetermined frequency. The second frequency may be determined as a frequency having a predetermined interval from the first frequency. The constant interval may be any interval known to be free from interfrequency interference of the wireless power signal.

Also, in some embodiments, the second frequency may be determined through a method of scanning a frequency within a predetermined band. That is, the wireless charger 100 performs scanning on a frequency band that can be used as a second known frequency, and calculates a goodness level for each frequency in the frequency band as a result of the scanning, based on the calculated goodness level. The second frequency may be determined. In this case, the frequency determined as the second frequency may be a frequency indicating the greatest goodness among the calculated goodnesses.

Further, in some embodiments, to determine the second frequency, the wireless charger 100 selects one or more discontinuous frequencies within the predetermined frequency band and calculates goodness for the selected frequencies. The calculated goodness level may be compared, and a frequency indicating the greatest goodness level may be determined as the second frequency. The selected discontinuous frequencies may have a difference by any interval known to be free of inter-frequency interference of the wireless power signal.

In this case, the second device 200 may determine whether the first frequency is used for power transmission to another electronic device (here, the first device 200 ′). For example, the second device 200 may determine whether the second device 200 is used based on the strength of the wireless power signal set to the first frequency or the goodness at the first frequency. Since the wireless charger 100 may change the frequency as described above when the first frequency is in use as a result of the determination, the second device 200 needs to be set according to the frequency to be changed similarly.

To this end, the second device 200 may determine the second frequency at which interference does not occur or receive it from the wireless charger 100. The method of determining the second frequency by the second device 200 is similar to that of the wireless charger 100.

For example, the second device 200 may determine another predetermined frequency as the second frequency. The other predetermined frequency may be a frequency having a predetermined interval from the first frequency.

In another example, the second device 200 selects one or more discontinuous frequencies of frequencies within a predetermined frequency band, determines whether the selected frequencies are used for power transmission to another electronic device, As a result of the determination, one of the unused frequencies among the selected frequencies may be determined as the second frequency.

Meanwhile, in some embodiments, as described with reference to FIG. 8, when the power converter 111 is configured to include a plurality of coils forming the wireless power signal, the wireless charger 100 may include the plurality of coils. For only some of the coils of the frequency can be set to the second frequency. In this case, the wireless power signal formed through some of the plurality of coils set to the second frequency is for delivering power to the second device, and the wireless power signal formed through the coils set to the remaining first frequency. May be for delivering power to the first device. In this case, the number of coils for forming the wireless power signal set to the second frequency may be determined based on the device information of the second device. Device information of the second device may be stored in the memory of the wireless charger 100 or may be received from the second device.

14 is a flowchart illustrating a method of adjusting a resonance frequency for one or more wireless power receivers according to embodiments of the present specification.

First, the wireless charger 100 sets a first frequency to form a wireless power signal for the first device 200 ′ to transmit power in a resonance coupling method (S10). The first frequency may be a resonance frequency for the resonance coupling.

Subsequently, when the second device 200 is newly placed in the area where the wireless power signal formed by the wireless charger 100 arrives, it is determined whether the interference occurs due to the wireless charger 100 (S20). .

Thereafter, the wireless charger 100 determines a second frequency at which interference does not occur with respect to the first device and the second device (S30). The second frequency may be a predetermined frequency or a frequency selected within a frequency band. Thereafter, the wireless charger 100 sets the determined second frequency to be a new resonant frequency of a wireless power signal. Power is transmitted using a wireless power signal having a frequency (S40).

The method described above can be implemented in a recording medium that can be read by a computer or similar device using, for example, software, hardware, or a combination thereof.

According to the hardware implementation, the methods described so far are application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), and processors ( It may be implemented using at least one of a processor, controllers, micro-controllers, microprocessors, or an electrical unit for performing other functions. The control unit 180 or the power transmission control unit 112 of the device 100 may be implemented, or the methods may be implemented by the control unit 280 or the power reception control unit 292 of the wireless power receiver 200. have.

According to the software implementation, embodiments such as the procedures and functions described herein may be implemented as separate software modules. Each of the software modules may perform one or more of the functions and operations described herein. Software code can be implemented in a software application written in a suitable programming language. The software code is stored in the memory 150 of the electronic device 100 and may be executed by the controller 180 or the power transmission controller 112, and likewise, the memory of the wireless power receiver 200 ( 260, and may be executed by the control unit 280 or the power receiving control unit 292.

The scope of the present invention is not limited to the embodiments disclosed herein, and the present invention may be modified, changed, or improved in various forms within the scope of the spirit and claims of the present invention.

Claims (17)

A power transmission device for transmitting power in a wireless magnetic resonance method,
A power converter configured to form a wireless power signal;
A frequency setting unit for setting a frequency of the wireless power signal;
A detector that determines whether interference occurs due to a device within a region where the wireless power signal formed by the power converter arrives; And
And a controller configured to cooperate with the power converter, the frequency setting unit, and the detection unit.
The control unit
Forming a wireless power signal set to a first frequency for the first device,
Determine whether interference due to a second device disposed in the area occurs;
If the interference occurs as a result of the determination, determine a second frequency that does not occur interference between the first device and the second device,
And setting the frequency of the wireless power signal to the determined second frequency. The method of claim 1, wherein the detection unit
And detecting interference based on a change in a good factor (Q-factor) at the first frequency due to the second device. 3. The apparatus of claim 2, wherein the control unit
And determining that interference occurs when the goodness at the first frequency is less than or equal to a threshold. The wireless power transmitter of claim 3, wherein the second frequency is determined as another predetermined frequency. The method of claim 4, wherein the other predetermined frequency is
Wireless power transmitter, characterized in that the frequency is a difference from the first frequency by a predetermined interval. 4. The method of claim 3, wherein the determination of the second frequency is
And calculating a goodness for each frequency by scanning a frequency within a predetermined band, and determining the second frequency based on the calculated goodness. The method of claim 6, wherein the frequency determined as the second frequency is
And a frequency representing the greatest goodness of the calculated goodnesses. 8. The method of claim 7, wherein the determination of the second frequency is:
Select one or more discontinuous frequencies of frequencies within the predetermined band;
Set the selected frequencies to a frequency of the wireless power signal;
Calculate goodness at the selected frequencies;
Comparing the calculated goodness levels;
And a frequency indicating the greatest goodness as the comparison result is determined as the second frequency. The method of claim 1,
The power converter is configured to include a plurality of coils for forming the wireless power signal,
The control unit is a wireless power transmitter, characterized in that for setting the frequency of the wireless power signal formed through some of the plurality of coils to the second frequency. 10. The wireless power transmitter of claim 9, wherein the wireless power signal formed through some of the plurality of coils set to the second frequency is for delivering power to the second device. The wireless power transmitter of claim 10, wherein the number of coils for forming the wireless power signal set to the second frequency is determined based on device information of the second device. An electronic device for receiving power in a wireless magnetic resonance method,
A power receiver for receiving a wireless power signal;
A frequency setting unit for setting a frequency for receiving the wireless power signal; And
A control unit configured to cooperate with the power receiver and the frequency setting unit,
The control unit
Determine whether the first frequency is used for power transmission to another electronic device,
Determining that the second frequency is not used by the other device when the first frequency is in use,
And control to set a frequency for receiving the wireless power signal to the determined second frequency. 13. The method of claim 12, wherein determining whether the first frequency is used
And determine based on the strength of the wireless power signal. 14. The method of claim 13, wherein determining whether the first frequency is used
And determine based on the goodness at the first frequency. The electronic device of claim 12, wherein the second frequency is determined as another predetermined frequency. The method of claim 15, wherein the other predetermined frequency is
The electronic device of claim 1, wherein the electronic device is a frequency having a predetermined interval from the first frequency. 13. The method of claim 12, wherein the determination of the second frequency is:
Select one or more discontinuous frequencies of frequencies within a predetermined band;
Determine whether the selected frequencies are used for power transmission to another electronic device;
And determining one of the unused frequencies among the selected frequencies as the second frequency as a result of the determination.

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