KR20140007273A - Wireless power transfer method, apparatus and system - Google Patents

Abstract

The present invention relates to a wireless power transmission method of a wireless power transmitter using an inverter topology of a full bridge and a half bridge, wherein the wireless power receiver detects whether a wireless power receiver exists within a range capable of transmitting power wirelessly. Sending a detection signal to the wireless power receiver; receiving at least one of identification information and setting information transmitted by the wireless power receiver; and a control error packet transmitted by the wireless power receiver. Receiving a (Control Error Packet) and applying a combination of driving frequency, duty cycle, or power signal phase to a full bridge or half bridge to control the amount of power to be transmitted. do.

Description

Wireless power transmission method, wireless power transmitter and wireless charging system {WIRELESS POWER TRANSFER METHOD, APPARATUS AND SYSTEM}

The present invention relates to a wireless power transmission method, a wireless power transmitter and a wireless charging system in the wireless power transmission field.

[0002] Instead of a method of supplying electrical energy to a wireless power receiving apparatus by wire, a method of wirelessly supplying electric energy without contact has been used. A wireless power receiving apparatus that receives energy wirelessly may be driven directly by the received wireless power, or may be powered by the charged power by charging the battery using the received wireless power.

The Wireless Power Consortium, which discusses the technology of magnetic induction wireless power transfer, stated on April 12, 2010, the "Wireless Power Transfer System Manual, Volume 1, on Interoperability in Wireless Power Transfer. Low Power, Part 1: Interface Definition, Version 1.00 RC1 (System Description Wireless Power Transfer, Volume 1, Low Power, Part 1: Interface Definition, Version 1.00 Release Candidate 1) "standard document. The standard document of the Wireless Power Association describes a method of transferring power from one wireless power transmission device to one wireless power receiving device by a magnetic induction method.

Version 1.00 is about low power transmission and reception of 5W power, and the specification for 5W or higher power transmission is undefined in the wireless power transmission currently defined by WPC, but the standard for middle power transmission and reception above 5W is expected. do.

One object of the present invention is to provide a middle power wireless power transmission method, a wireless power transmitter and a wireless charging system compatible with a low power receiver.

Another object of the present invention is to provide a standard for allowing a middle power and a low power to be compatible by transmitting and receiving a signal in a form different from the conventional method in a wireless power transmission method.

In order to achieve the above object, the wireless power transmission method according to the present invention, in the wireless power transmission method of the wireless power transmitter using a full bridge and half bridge inverter topology, the wireless power transmission method Detecting whether a wireless power receiver exists within a range that can be transmitted, sending a detection signal to the wireless power receiver, and receiving at least one of identification information and setting information transmitted by the wireless power receiver. And receiving a control error packet transmitted by the wireless power receiver, and applying a combination of driving frequency, duty cycle, or power signal phase to a full bridge or half bridge, Controlling the size of the.

Further, according to an example of the present invention, the inverter topology is converted from half bridge to full bridge after receiving the first control error packet from the middle power wireless power receiver.

When receiving the first control error packet, the size of the power to be transmitted may be selected using version information of the identification packet collected from the wireless power receiver. When switching from the half bridge to the full bridge, the driving frequency can be shifted.

According to another embodiment of the present invention, the power transfer unit of the wireless power transmitter uses a voltage corresponding to a half bridge as an initial voltage.

The wireless power transmitter may drive the power transmission unit as one of a full bridge and a half bridge based on indicating whether the wireless power receiver corresponds to middle power or low power.

According to another embodiment of the present invention, the wireless power transmitter receives an identification packet from the wireless power receiver, and the identification packet includes version information of the wireless power receiver.

The wireless power transmitter starts driving the LC in the half bridge, and may determine whether to switch to the full bridge using the version information. The wireless power transmitter may switch from a half bridge to a full bridge when the version information corresponds to middle power, and maintain a half bridge when the version information corresponds to low power.

In addition, according to another embodiment of the present invention, the driving frequency used in the step of detecting whether the wireless power receiver is present may be 140kHz.

The present invention also provides a wireless power receiving method for receiving wireless power from a wireless power transmitter using a full bridge and half bridge inverter topology, the method comprising: sending a detection signal to the wireless power transmitter; Transmitting at least one of identification information and setting information to the wireless power transmitter, and sending a control error packet to the wireless power transmitter, wherein the wireless power transmitter includes a driving frequency, The wireless power receiver transmits version information to the wireless power transmitter to apply a combination of duty cycle or power signal phase to the full or half bridge to control the amount of power to be transmitted. The method is disclosed.

The present invention also provides a wireless power transmitter using a full bridge and half bridge inverter topology, wherein the wireless power transmitter includes a wireless power receiver within a range capable of transmitting power wirelessly. Detecting whether or not, transmitting a detection signal to the wireless power receiver, receiving at least one of identification information and setting information transmitted by the wireless power receiver, and transmitting the wireless power receiver. Receiving a Control Error Packet, and applying a combination of driving frequency, duty cycle, or power signal phase to a full bridge or half bridge to control the amount of power to be transmitted. A wireless power transmitter is disclosed.

The present invention also includes a wireless power transmitter configured to transmit wireless power, and a wireless power receiver configured to receive the wireless power transmitted from the transmitter, wherein the power transmission unit of the wireless power transmitter is full. And an LC circuit configured to switch between a bridge and a half bridge, wherein the wireless power receiver is configured such that the transmitter determines whether to drive the power transfer unit with a full bridge or a half bridge. Discloses a wireless charging system, wherein the wireless charging system is configured to indicate whether the power corresponds to middle power or low power.

The present invention proposes an LC resonance driving method for compatibility between wireless power transmitters and receivers having different power capacities, thereby increasing the application range of the wireless power transceiver. More specifically, different power receivers may be compatible between wireless chargers by introducing a method in which the transmitter detects whether the receiver is low power or middle power and selects an LC resonance driving mode.

In addition, the present invention relates to a method for ensuring compatibility with a low power receiver of Chapter 3.2.2 Power Transmitter design MPA2 during “Wireless Power Transfer Volume II: Medium Power Part1: Interface Definition” under WPC. After reception, the driving method of the bridge circuit is changed so that the medium power (~ 15W) transmission system can be used interchangeably with the 5W reception system.

1 is an exemplary view conceptually showing a wireless power transmitter and a wireless power receiver according to embodiments of the present invention.
2A and 2B are exemplary block diagrams illustrating configurations of a wireless power transmitter and a wireless power receiver that can be employed in the embodiments disclosed herein.
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 exemplarily illustrating a part of a configuration of a magnetic induction wireless power transmitter and a wireless power receiver that may be employed in the embodiments disclosed herein.
5 is a block diagram of a wireless power transmission apparatus configured to have one or more transmission coils that receive power in accordance with an inductive coupling scheme employable 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 transmission apparatus configured to have one or more transmission coils that receive power in accordance with a resonant coupling scheme employable in the embodiments disclosed herein.
FIG. 9 illustrates a concept of transmitting and receiving a packet between a wireless power transmitter and an electronic device through modulation and demodulation of a wireless power signal in wireless power transfer according to embodiments of the present disclosure.
10 illustrates a configuration for transmitting and receiving a power control message in wireless power transmission according to embodiments disclosed herein.
11 illustrates the form of a signal in modulation and demodulation performed in wireless power transfer in accordance with embodiments disclosed herein.
12 illustrates a packet including a power control message used in a wireless power transfer method according to embodiments disclosed herein.
FIG. 13 illustrates operation states of a wireless power transmitter and a wireless power receiver according to the embodiments disclosed herein.
14 to 18 illustrate structures of packets including a power control message between the wireless power transmitter 100 and the wireless power receiver.
19 is a conceptual diagram illustrating a method of transmitting power to one or more wireless power receivers by a wireless power transmitter.
20 is a conceptual diagram illustrating a WPC communication flow.
21 is a communication flow diagram in a method according to an embodiment of the present invention.
22 is a block diagram of a receiver identification packet.
23 is a flowchart showing a communication flow proposed in the present invention.
24 and 25 are conceptual views illustrating an example of using middle power.
26 and 27 are diagrams showing circuits driven by a full bridge and a half bridge, respectively.
28 and 29 are diagrams showing modifications of the circuit driven by the full bridge and the half bridge, respectively.
30 is a flowchart illustrating a communication flow proposed by another example of the present invention.
31 and 32 are conceptual views illustrating an example of using middle power in another example of the present invention.

The technology disclosed herein applies to wireless power transmission. However, the technology disclosed in this specification is not limited thereto, and can be applied to all power transmission systems and methods, wireless charging circuits and methods, and other methods and apparatus that utilize wirelessly transmitted power to which the technical idea of the technology can 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 invention. It is also to be understood that the technical terms used herein are to be interpreted in a sense generally understood by a person skilled in the art to which the present invention belongs, Should not be construed to mean, or be interpreted in an excessively reduced sense. In addition, when the technical terms used herein are incorrect technical terms that do not accurately represent the spirit of the present invention, it should be replaced with technical terms that can be understood correctly by those skilled in the art. In addition, the general terms used in the present invention should be interpreted according to a predefined or prior context, and should not be construed as being excessively reduced.

Also, the singular forms "as used herein include plural referents unless the context clearly dictates otherwise. In the present application, the term "comprising" or "comprising" or the like should not be construed as necessarily including the various elements or steps described in the specification, Or may be further comprised of additional components or steps.

In addition, the suffixes "module" and "unit" for the components used herein are given or mixed in consideration of ease of specification, and do not have distinct meanings or roles from each other.

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.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or similar elements throughout the several views, and redundant description thereof will be omitted.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It is to be noted that the accompanying drawings are only for the purpose of facilitating understanding of the present invention, and should not be construed as limiting the scope of the present invention with reference to the accompanying drawings.

Justice

Many-to-one communication method: how one transmitter (Tx) communicates with multiple receivers (Rx)

One-way communication: A communication method in which a receiver sends only necessary messages toward the transmitter

Bidirectional communication: A method of communication in which a transmitter is a receiver and a receiver is a transmitter, that is, a message can be transmitted from both sides

Here, the transmitter and the receiver have the same meaning as the transmitter and the receiver, respectively. Hereinafter, these terms may be used interchangeably.

Wireless power transmitter and wireless power receiver conceptual diagram

1 is an exemplary view conceptually showing a wireless power transmitter and a wireless power receiver according to embodiments of the present invention.

As can be seen with reference to FIG. 1, the wireless power transmitter 100 may be a power transmission device that transfers power wirelessly required by 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.

The wireless power receiver 200 may be a mobile communication terminal (eg, a mobile phone, a cellular phone, a tablet) or a multimedia device, as described below.

Meanwhile, the wireless power transmitter 100 may wirelessly transfer power to the wireless power receiver 200 without contact with each other by using one or more wireless power transfer methods. That is, the wireless power transmitter 100 has an inductive coupling based on magnetic induction caused by the wireless power signal and a magnetic resonance coupling based on an electromagnetic resonance caused by a wireless power signal having a specific frequency. Power may be delivered using one or more of the following methods.

The wireless power transmission by the inductive coupling method is a technology for wirelessly transmitting power by using a primary coil and a secondary coil, and the electric power is induced by inducing current to the other coil through a magnetic field that is changed in one coil by a magnetic induction phenomenon. Say it is being delivered.

In the wireless power transmission by the resonance coupling method, resonance occurs in the wireless power receiver 200 by a wireless power signal transmitted from the wireless power transmitter 100, and the wireless power transmitter is caused by the resonance phenomenon. The power is transmitted from the 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. In adding reference numerals to the components of the following drawings, the same components are used the same reference numerals as much as possible even if they are displayed on different drawings.

2A and 2B are block diagrams exemplarily illustrating configurations of the wireless power transmitter 100 and the 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. For this, the power conversion unit 111 may be configured to include a coil for generating the wireless power signal.

The power conversion unit 111 may include components for forming different types of wireless power signals according to each power transmission scheme. For example, 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. have. In addition, the power converter 111 may be configured to include 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. have.

In addition, the power converter 111 may transfer power using at least one of the above-described inductive coupling method and resonance coupling method.

Among the components included in the power converter 111, those that follow the inductive coupling method will be described below with reference to FIGS. 4 and 5, and those that follow the resonance coupling method with reference to FIGS. 7 and 8.

On the other hand, the power converter 111 may be configured to further include a circuit that can adjust the characteristics such as the frequency, applied voltage, current used to form the wireless power signal.

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

On the other hand, the wireless power signal can reach the area can be divided into two. 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 vary according to a wireless power transmission method such as an inductive coupling method and a resonance coupling method.

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.

In addition, the power transmission control unit 112 may determine one or more characteristics of the frequency, voltage, and 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.

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, Operation can be performed.

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 transmission apparatus 100 may perform a general control operation related to wireless power transmission 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 order to receive the power control message, the power transmission control unit 112 may use at least one of a method of receiving through the wireless power signal and a method of receiving other user data.

In order to receive the power control message, the wireless power transmission apparatus 100 may further include a power communication modulation / demodulation unit 113 electrically connected to the power conversion unit 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, in some embodiments, the power transmission control unit 112 receives the user data including the power control message by a communication means (not shown) included in the wireless power transmitter 100 to control the power control message. May be obtained.

[In-band two-way communication support]

In addition, in the wireless power transmission environment capable of bi-directional communication according to the embodiments disclosed herein, the power transmission control unit 112 may transmit data to the wireless power receiver 200. The data transmitted by the power transmission control unit 112 may be a request for the wireless power receiver 200 to send a power control message.

Wireless power receiver

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 receiver 291 and a power receiving control unit 292.

The power receiving unit 291 receives power transmitted from the wireless power transmission apparatus 100 wirelessly.

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 transmission schemes. In this case, the power receiver 291 may include necessary components according to each scheme.

First, the power receiving unit 291 may be configured to include a coil for receiving a radio power signal transmitted in the form of a magnetic field or an electromagnetic field having an oscillating characteristic.

For example, as a component according to an inductive coupling method, the power receiver 291 may include a secondary coil in which a current is induced by a changing magnetic field. In addition, 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 method.

However, when the power receiver 291 receives power according to one or more wireless power transfer schemes, the power receiver 291 is implemented to receive using one coil, or differently formed according to each power transfer scheme. It may be implemented to receive using a coil.

Among the components included in the power receiver 291, those following the inductive coupling method will be described with reference to FIG. 4, and those following the resonance coupling method will be described below with reference to FIG. 7.

The power receiver 291 may further include a rectifier and a regulator for converting the wireless power signal into a direct current. In addition, the power receiver 291 may further include a circuit for preventing overvoltage or overcurrent from occurring by the received power signal.

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

Specifically, the power receiving control unit 292 may transmit a power control message to the wireless power transmission apparatus 100. FIG. The power control message may instruct the wireless power transmission apparatus 100 to start or terminate the transmission of the wireless power signal. The power control message may also direct the wireless power transmission apparatus 100 to adjust the characteristics of the wireless power signal.

In order to transmit the power control message, the power reception control unit 292 may use at least one of a method of transmitting through the wireless power signal and a method of transmitting through other 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 modem unit 293 can be used to transmit the power control message through the wireless power signal, as in the case of the wireless power transmission apparatus 100 described above. The modem unit 293 may be used as a means for adjusting the current and / or voltage flowing through the power conversion unit 111 of the wireless power transmission apparatus 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 conversion unit 111 is received by the power receiving unit 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 modify the reactance of the modem unit 293 connected to the power reception unit 291 so that the amount of power received from the wireless power signal changes accordingly 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 modulation and demodulation unit 113 of the wireless power transmission apparatus 100 detects a change in the current and / or voltage of the power conversion unit 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 transmits the user data including the power control message by a communication means (not shown) included in the wireless power receiver 200 to control the power control message. May be transmitted to the wireless power transmitter 100.

[In-band two-way communication support]

In addition, in the wireless power transmission environment capable of bidirectional communication according to the embodiments disclosed herein, the power receiving control unit 292 may receive data transmitted from the wireless power transmitter 100. The data transmitted from the wireless power transmitter 100 may request to transmit a power control message.

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. In this case, the power receiving control unit 292 may control the charging unit 298 to perform charging by using the transferred power.

Hereinafter, a wireless power transmitter and a wireless power receiver applicable to the embodiments disclosed herein will be described. First, a method of transferring power by the wireless power transmitter to the wireless power receiver according to an inductive coupling method will be described with reference to FIGS. 3 to 5.

Inductive coupling

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

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

According to this scheme, the power conversion section 111 of the wireless power transmission apparatus 100 is configured to include a transmission coil (Tx coil) 1111a that operates 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 transmitter 100 may be configured to include an interface surface (not shown) in the form of a flat surface for wireless power transfer by an 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. The arrangement indicating unit may be a simple mark or may be formed in the form of a protruding structure that guides the position of the wireless power receiver 200. Alternatively, the arrangement indicator may be formed in the form of a magnetic material such as a magnet mounted on the lower portion of the interface surface, such that the coils are arranged by mutual attraction with the magnetic material of the other pole mounted inside the wireless power receiver 200. You can also guide to achieve this.

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. A wireless power transmitter 100 including the one or more transmission coils will be described below with reference to FIG. 5.

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 a configuration of a wireless power transmitter 100 and a wireless power receiver 200 of the magnetic induction method that can 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. 4A, and the power supply unit included in the wireless power receiver 200 will be described with reference to FIG. 4B. The configuration of 290 will be described.

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

As described above, the transmission coil 1111a forms a magnetic field corresponding to a radio power signal in accordance with a change in current. The transmission coil 1111a may be implemented in a planar spiral type or a cylindrical solenoid type.

The inverter 1112 transforms a DC input obtained from the power supply unit 190 into an AC waveform. The alternating current transformed by the inverter 1112 drives a resonant circuit including the transmitting coil 1111a and a capacitor (not shown) so that a magnetic field is formed in the transmitting coil 1111a. .

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

The positioning unit 1114 may move or rotate the transmission coil 1111a to increase the efficiency of the wireless power transmission by the inductive coupling scheme. 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 converter 111 is configured to include a plurality of transmission coils, the position determiner 1114 may determine which of the plurality of transmission coils will be used for power transmission. The configuration of the wireless power transmitter 100 including the plurality of transmission coils will be described later with reference to FIG. 5.

On the other hand, the power converter 111 may be configured to further include a power sensing unit 1115. The power sensing unit 1115 of the wireless power transmitter 100 monitors a current or voltage flowing through the transmission coil 1111a. The power sensing unit 1115 is for checking whether the wireless power transmitter 100 operates normally. The power sensing unit 1115 detects a voltage or current of a power supplied from the outside and determines whether the detected voltage or current exceeds a threshold. You can check it. Although not shown, the power sensing unit 1115 compares a resistance for detecting a voltage or current of a power source supplied from an external source with a threshold value of a voltage value or a current value of the detected power source, and outputs a comparison result. It may include a comparator. Based on the check result of the power sensing unit 1115, the power transmission control unit 112 may control a switching unit (not shown) to cut off 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.

A current is induced in the reception coil 2911a by a change in the magnetic field formed from the transmission coil 1111a. The implementation form of the receiving coil 2911a may be in the form of a flat spiral or a cylindrical solenoid, as in the case of the transmitting coil 1111a.

In addition, series and parallel capacitors may be connected to the receiving coil 2911a to enhance reception efficiency of the 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 rectifying circuit 2913 performs full-wave rectification on the current to convert the alternating current into direct current. The rectifier circuit 2913 may be implemented by, for example, a full bridge rectifier circuit including four diodes or a circuit using active components.

In addition, the rectifying circuit 2913 may further include a regulator for converting the rectified current into a more flat and stable direct current. The output power of the rectifying circuit 2913 is supplied to the respective components of the power supply unit 290. The rectifying circuit 2913 is a DC-DC converter that 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 similar to the charging unit 298) (DC-DC converter).

The modulation and demodulation unit 293 may be constituted by a resistive element connected to the power receiving unit 291 and having a resistance varying with respect to a direct current and a capacitive element whose reactance is changed with respect to an alternating current . The power receiving control unit 292 may modulate the wireless power signal received by the power receiving unit 291 by changing the resistance or reactance of the modem unit 293.

Meanwhile, the power supply unit 290 may be configured to 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

5 is a block diagram of a wireless power transmission apparatus configured to have one or more transmission coils that receive power in accordance with an inductive coupling scheme employable in the embodiments disclosed herein.

Referring to FIG. 5, the power converter 111 of the wireless power transmitter 100 according to the exemplary embodiments disclosed herein may be composed of one or more transmission coils 1111a-1 to 1111a-n. The one or more transmission coils 1111a-1 to 1111a-n may be an array of partly overlapping primary coils. An active area may be determined by a portion of the one or more transmission coils.

The one or more transmission coils 1111a-1 to 1111a-n may be mounted below the interface surface. The power conversion unit 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. For example, the power transmission control unit 112 may acquire 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 be. As another example, the power transmission control unit 112 may use the one or more transmission coils 1111a-1 to 1111a-n, respectively, to 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. You may.

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. At this time, a single transmission coil or a combination of one or more transmission coils for 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.

In addition, 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 transferring power by a wireless power transmitter in accordance with a resonance coupling method will be described with reference to FIGS. 6 to 8.

Resonant coupling method

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.

First, the resonance (or resonance) will be briefly described as follows. Resonance refers to a phenomenon in which the vibration system receives an external force periodically having the same frequency as its natural frequency, and the amplitude thereof increases sharply. Resonance is a phenomenon occurring in all vibrations, such as mechanical vibration and electrical vibration. Generally, when a force capable of vibrating the vibration system is applied from the outside, if the natural frequency of the vibration system is equal to the frequency of the external force, the vibration becomes larger and the amplitude becomes larger.

In the same principle, when a plurality of vibrating bodies separated within a certain distance oscillate at the same frequency, the plurality of vibrating bodies resonate with each other, and in this case, the resistance between the vibrating bodies decreases. In electrical circuits, inductors and capacitors can be used to create resonant circuits.

When the power transmission of the wireless power transmission apparatus 100 follows the resonant coupling scheme, a magnetic field having a specific vibration frequency is formed by the AC power source 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 can be determined by, for example, the following equation (1).

[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 may be determined by the number of rotations of the coil, etc., and the capacitance may be determined by the distance, area, etc. 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, when 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 1111b in which a magnetic field is formed. It may be configured to include a resonant circuit 1116 connected to the transmitting coil 1111b and for determining 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 transmission apparatus 100 may be obtained using Equation 1 with LTx, CTx. Herein, when the result of substituting LRX and CRX 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 the wireless power transmission method using resonance coupling, when the wireless power transmitter 100 and the wireless power receiver 200 each resonate at the same frequency, electromagnetic waves are transmitted through a near field, and if the frequencies are different, There is no energy transfer between 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.

The configuration of the power transmission unit 110 included in the wireless power transmission apparatus 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 transmission coil 1111b may be mounted separately from the transmission coil 1111a for transmitting electric power according to the inductive coupling scheme, but it may also transmit power using an inductive coupling scheme or a resonant coupling scheme using one single coil.

The transmission coil 1111b forms a magnetic field for transmitting electric 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 resonant circuit 1116.

In addition, the power conversion unit 111 may further include a frequency adjustment unit 1117 for changing the resonance frequency value of the power conversion unit 111. Since the resonance frequency of the power conversion unit 111 is determined based on the inductance and the capacitance in the circuit constituting the power conversion unit 111 according to Equation 1, the power transmission control unit 112 controls the inductance and / The resonance frequency of the power converter 111 can be determined by controlling the frequency adjuster 1117 so that the capacitance is changed.

The frequency adjusting unit 1117 may include, for example, a motor capable of changing capacitance by adjusting a distance between capacitors included in the resonant circuit 1116, or the number of rotations of the transmission coil 1111b ( number of turns) or a motor that can change the inductance by adjusting its diameter, or can 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.

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 receiving unit 291 of the power supply unit 290 may be configured to further include a rectifying circuit 2913 that converts the alternating current generated by the resonance phenomenon to direct current. The rectifying circuit 2913 may be constructed 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

FIG. 8 is a block diagram of a wireless power transmitter configured to have one or more transmitting coils receiving power in accordance with a resonant coupling scheme employable in embodiments disclosed herein.

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). The power conversion unit 111 may further include a multiplexer 1113 for establishing and releasing a connection of some of the one or more transmission coils 1111b-1 to 1111b-n .

The one or more transmitting coils 1111b-1 to 1111b-n may be set to have the same resonant frequency, or some of them may be set to have different resonant frequencies. This is determined by what inductance and / or capacitance the resonant circuits 1116-1 through 1116-n respectively connected with the one or more transmitting coils 1111b-1 through 1111b-n have.

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.

In - band communication

FIG. 9 illustrates a concept of transmitting and receiving a packet between a wireless power transmitter and an electronic device through modulation and demodulation of a wireless power signal in wireless power transfer according to embodiments of the present disclosure.

Referring to FIG. 9, the power converter 111 included in the wireless power transmitter 100 forms a wireless power signal. The wireless power signal is formed through the transmission coil 1111 included in the power converter 111.

The wireless power signal 10a formed by the power converter 111 arrives at the electronic device 200 and is received through the power receiver 291 included in the electronic device 200. The formed wireless power signal is received through the receiving coil 2911 included in the power receiver 291.

The power reception control unit 292 modulates the wireless power signal while the electronic device 200 receives the wireless power signal by controlling the modulation and demodulation unit 293 connected to the power reception unit 291. . When the received wireless power signal is modulated, the wireless power signal forms a closed-loop within a magnetic field or an electro-magnetic field,

The wireless power transmission apparatus 100 can sense the modulated wireless power signal 10b. The demodulation unit 113 may demodulate the sensed wireless power signal and decode the packet from the demodulated wireless power signal.

Meanwhile, a modulation method used for communication between the wireless power transmitter 100 and the electronic device 200 may be amplitude modulation. As described above, in the amplitude modulation method, the modulation / demodulation unit 293 on the side of the electronic device 200 changes the amplitude of the wireless power signal 10a formed by the power conversion unit 111 so that the wireless power transmitter Modulation and demodulation unit 293 on the (100) side may be a backscatter modulation scheme for detecting the amplitude of the modulated wireless power signal 10b.

Modulation and Demodulation of Wireless Power Signals

Hereinafter, modulation and demodulation of a packet transmitted and received between the wireless power transmitter 100 and the electronic device 200 will be described with reference to FIGS. 10 and 11.

10 illustrates a configuration for transmitting and receiving a power control message in wireless power transmission according to embodiments disclosed herein. 11 illustrates the form of a signal in modulation and demodulation performed in wireless power transfer in accordance with embodiments disclosed herein.

Referring to FIG. 10, the wireless power signal received through the power receiver 291 of the electronic device 200 is an unmodulated wireless power signal 51 as shown in FIG. 11A. Resonant coupling is performed between the electronic device 200 and the wireless power transmitter 100 according to a resonance frequency set by the resonance forming circuit 2912 in the power receiver 291, and the receiving coil 2911b is connected to the electronic device 200. The wireless power signal 51 is received through.

The power reception control unit 292 modulates the wireless power signal 51 received through the power reception unit 291 by changing the load impedance in the modulator 293. The modulation and demodulation unit 293 may be configured to include a passive element 2931 and an active element 2932 for modulating the wireless power signal 51. The modulation / demodulation unit 293 modulates the wireless power signal 51 to include a packet to be transmitted to the wireless power transmitter 100. In this case, the packet may be input to the active element 2932 in the modulation and demodulation unit 293.

Thereafter, the power transmission control unit 112 of the wireless power transmitter 100 demodulates the modulated wireless power signal 52 through an envelope detection process and decodes the detected signal 53. It decodes into digital data 54. The demodulation process detects that a current or voltage flowing through the power converter 111 is divided into two states, a HI state and a LO state, by the modulated wireless power signal. The electronic device 200 acquires a packet to be transmitted based on digital data classified according to FIG.

Hereinafter, a process of acquiring the power control message to be transmitted by the electronic device 200 from the digital data demodulated by the wireless power transmission apparatus 100 will be described.

Referring to FIG. 11B, the power transmission control unit 112 detects an encoded bit from the envelope detected signal by using the clock signal CLK. The detected encoded bits are encoded according to the bit encoding method used in the modulation process on the electronic device 200 side. In some embodiments, the bit encoding method may be NRZ (non-return to zero). In some embodiments, the bit encoding method may be bi-phase encoding.

For example, in some embodiments, the detected bits may be differential bi-phase (DBP) encoded. According to the DBP encoding, the power reception control unit 292 of the electronic device 200 has two state transitions to encode the data bit 1, and one state transition to encode the data bit 0, . That is, the data bit 1 is encoded such that the transition between the HI state and the LO state occurs at the rising edge and the falling edge of the clock signal, and the data bit 0 is at the rising edge of HI State and the LO state may be encoded to occur.

Meanwhile, the power transmission control unit 112 may obtain data in units of bytes using a byte format constituting a packet from the detected bit string according to the bit encoding method. In some embodiments, the detected bit string may be transmitted using an 11-bit asynchronous serial format as shown in (c) of FIG. 11. That is, it may include a start bit for notifying the start of the byte and a stop bit for notifying the end of the byte, and include data bits b0 to b7 between the start bit and the end bit. In addition, a parity bit may be added to check for errors in the data. The byte data constitutes a packet including a power control message.

[When supporting in-band two-way communication]

In FIG. 9, although the wireless power receiver 200 transmits a packet using a carrier signal 10a formed by the wireless power transmitter 100, the wireless power transmission is illustrated. The device 100 may also transmit data to the wireless power receiver 200 in a similar manner as above.

That is, the power transmission control unit 112 may control the demodulation unit 113 to modulate data to be transmitted to the wireless power receiver 200 to be carried on the carrier signal 10a. In this case, the power demodulation unit 293 controls the demodulation unit 293 to perform demodulation so that the power reception control unit 292 of the wireless power receiver 200 can acquire data from the modulated carrier signal 10a. Can be.

Packet format

Hereinafter, a structure of a packet used in communication using a wireless power signal according to the embodiments disclosed herein will be described.

12 illustrates a packet including a power control message used in a wireless power transfer method according to embodiments disclosed herein.

Referring to FIG. 12A, the wireless power transmitter 100 and the electronic device 200 may transmit and receive data to be transmitted in the form of a command packet (command_packet) 510. The command packet 510 may be configured to include a header 511 and a message 512.

The header 511 may include a field indicating a type of data included in the message 512. The size and type of the message may be determined based on a value indicated by a field indicating the type of data.

In addition, the header 511 may include an address field for identifying the sender of the packet. For example, the address field may indicate an identifier of the electronic device 200 or an identifier of a group to which the electronic device 200 belongs. When the electronic device 200 intends to transmit the packet 510, the electronic device 200 generates the packet 510 such that the address field of the packet 510 indicates its own identification information. can do.

The message 512 includes data to be transmitted by the sender of the packet 510. The data included in the message 512 may be a report, a request, or a response to the counterpart.

Meanwhile, in some embodiments, the command packet 510 may be configured as shown in FIG. 12B. The header 511 included in the command packet 510 may be expressed in a constant size. For example, the header 511 may be two bytes in size.

The header 511 may be configured to include a reception address field. For example, the reception address field may be 6 bits in size.

The header 511 may be configured to include an operation command field (OCF) or an operation group field (OCF). OGF is a value given to each group of commands for the electronic device 200, and OCF is a value given to each command existing in each group in which the electronic device 200 is included.

The message 512 may be expressed by dividing the length field 5121 of the parameter and the value field 5122 of the parameter. That is, the sender of the packet 510 may configure the message in the form of length-value pairs (5121a-5122a, etc.) of one or more parameters required to express the data to be transmitted.

Referring to FIG. 12C, the wireless power transmitter 100 and the electronic device 200 may include a preamble 520 and a checksum 530 for transmission to the command packet 510. The data can be transmitted and received in the form.

The preamble 520 is used to synchronize the data received by the wireless power transmitter 100 and accurately detect the start bit of the command packet 510. The preamble 520 may be configured such that the same bit is repeated. For example, the preamble 520 may be configured such that data bit 1 according to the DBP encoding is repeated 11 to 25 times.

The checksum 530 is used to detect an error that may occur in the command packet 510 while a power control message is being transmitted.

Operational state ( Phases )

Hereinafter, operation states of the wireless power transmitter 100 and the wireless power receiver 200 will be described.

FIG. 13 illustrates operating states of the wireless power transmitter 100 and the wireless power receiver 200 according to the embodiments disclosed herein. 14 to 18 illustrate a structure of packets including a power control message between the wireless power transmitter 100 and the wireless power receiver 200.

Referring to FIG. 13, an operation state of the wireless power transmitter 100 and the wireless power receiver 200 for wireless power transmission may include a selection phase 610 and a detection phase 620. , Identification and configuration phase 630, and power transfer phase 640.

In the selection state 610, the wireless power transmitter 100 detects whether objects exist within a range in which power can be transmitted wirelessly, and in the detection state 620, the wireless power transmitter ( 100 transmits a detection signal to the detected object, and the wireless power receiver 200 transmits a response to the detection signal.

In addition, in the identification and setting state 630, the wireless power transmitter 100 identifies the selected wireless power receiver 200 through previous states and obtains setting information for power transmission. In the power transmission state 640, the wireless power transmitter 100 adjusts the power transmitted in response to the control message received from the wireless power receiver 200, and to the wireless power receiver 200. Transmit power.

Hereinafter, the respective operation states will be described in detail.

1) Selection status ( Selection Phase )

The wireless power transmitter 100 in the selection state 610 performs a detection process to select the wireless power receiver 200 existing in the sensing area. As described above, the sensing area refers to an area where an object in the area can affect the characteristics of the power of the power conversion part 111. [ Compared to the detection state 620, the detection process for the selection of the wireless power receiver 200 in the selection state 610 is to receive a response from the wireless power receiver 200 using a power control message. Instead of the method, the power converter of the wireless power transmitter 100 detects a change in the amount of power for forming the wireless power signal and checks whether an object exists within a predetermined range. The detection process in the selected state 610 may be referred to as an analog detection process (analog ping) in that an object is detected using a wireless power signal without using a digital format packet in a detection state 620 to be described later .

The wireless power transmission apparatus 100 in the selected state 610 can sense that an object enters and exits the sensing area. In addition, the wireless power transmitter 100 may distinguish between the wireless power receiver 200 capable of transmitting power wirelessly from other objects within the sensing area and other objects (eg, a key, a coin, etc.). Can be.

As described above, since the distance over which the electric power can be transmitted wirelessly differs according to the inductive coupling method and the resonant coupling method, the sensing area where the object is detected in the selected state 610 may be different from each other.

First, when power is transmitted according to an inductive coupling method, the wireless power transmitter 100 in the selection state 610 may monitor an interface surface (not shown) to detect placement and removal of objects.

In addition, the wireless power transmitter 100 may detect the position of the wireless power receiver 200 placed on the interface surface. As described above, the wireless power transmission apparatus 100 formed to include one or more transmission coils enters the detection state 620 in the selected state 610 and uses each coil in the detection state 620 A method for confirming whether or not a response to the detection signal is transmitted from the object, or thereafter entering the identification state 630 and checking whether the identification information is transmitted from the object. The wireless power transmitter 100 may determine a coil to be used for wireless power transmission based on the detected position of the wireless power receiver 200 obtained through the above process.

In addition, when power is transmitted according to the resonance coupling method, the wireless power transmitter 100 in the selection state 610 may change one or more of the frequency, current, and voltage of the power converter due to an object in the sensing area. The object can be detected by detecting the object.

Meanwhile, the wireless power transmission apparatus 100 in the selected state 610 can detect an object by at least one of the inductive coupling method and the resonant coupling method detection method. The wireless power transmission apparatus 100 performs an object detection process according to each power transmission method and then detects the object among the combining methods for wireless power transmission in order to proceed to other states 620, 630, and 640 You can choose one method.

Meanwhile, the wireless power transmitter 100 in the selected state 610 performs digital detection, identification, setting, and power transmission in a wireless power signal formed to detect an object and subsequent states 620, 630, and 640. The wireless power signal to be formed may have different characteristics such as frequency and strength. This is because the selected state 610 of the wireless power transmitter 100 corresponds to an idle phase for detecting an object, so that the wireless power transmitter 100 may reduce power consumption in standby or may be efficient. This is to generate a signal specialized for detecting an object.

2) Detection status ( Ping Phase )

The wireless power transmitter 100 in the detection state 620 detects the wireless power receiver 200 existing in the detection area through a power control message. Compared with the detection process of the wireless power receiver 200 using the characteristics of the wireless power signal in the selection state 610, the detection process in the detection state 620 may be referred to as a digital ping process. have.

In the detection state 620, the wireless power transmitter 100 forms a wireless power signal for detecting the wireless power receiver 200, and modulates the wireless power signal by the wireless power receiver 200. Demodulate and obtain a power control message in the form of digital data corresponding to the response to the detection signal from the demodulated wireless power signal. The wireless power transmitter 100 may recognize the wireless power receiver 200 that is the target of power transmission by receiving a power control message corresponding to the response to the detection signal.

The detection signal formed by the wireless power transmission apparatus 100 in the detection state 620 to perform the digital detection process is a wireless power signal generated by applying a power signal of a specific operating point for a predetermined time . The operating point may refer to a frequency, a duty cycle and an amplitude of a voltage applied to the Tx coil. The wireless power transmitter 100 may generate the detection signal generated by applying the power signal of the specific operation point for a predetermined time and attempt to receive a power control message from the wireless power receiver 200. have.

On the other hand, the power control message corresponding to the response to the detection signal may be a message indicating the strength (strength) of the wireless power signal received by the wireless power receiver 200. For example, the wireless power receiver 200 may include a signal strength packet 5100 including a message indicating the strength of a wireless power signal received as a response to the detection signal as shown in FIG. 14. ) Can be sent. The packet 5100 may be configured to include a header 5120 indicating that the packet indicates a signal strength and a message 5130 indicating the strength of a power signal received by the wireless power receiver 200. The strength of the power signal in the message 5130 may be a value representing a degree of coupling for inductive coupling or resonance coupling for power transmission between the wireless power transmitter 100 and the wireless power receiver 200. have.

After receiving the response message to the detection signal, the wireless power transmitter 100 discovers the wireless power receiver 200, the wireless power transmitter 100 may extend the digital detection process to enter the identification and detection state 630. have. That is, the wireless power transmitter 100 may receive the power control message required in the identification and detection state 630 by maintaining the power signal of the specific operation point after discovering the wireless power receiver 200. have.

However, when the wireless power transmitter 100 does not find the wireless power receiver 200 capable of delivering power, the operation state of the wireless power transmitter 100 returns to the selection state 610. Can be.

3) identification and setting status ( Identification and Configuration Phase )

The wireless power transmitter 100 in the identification and setting state 630 may receive the identification information and / or setting information transmitted by the wireless power receiver 200 and control the power transfer to be performed efficiently.

In the identification and setting state 630, the wireless power receiver 200 may transmit a power control message including its own identification information. To this end, the wireless power receiver 200 may transmit, for example, an identification packet 5200 including a message indicating identification information of the wireless power receiver 200 as illustrated in FIG. 15A. have. The packet 5200 may be configured to include a header 5220 indicating that the packet represents identification information and a message 5230 including identification information of the wireless power receiver. The message 5230 includes information (2531 and 5232) indicating the version of the protocol for wireless power transmission, information (5233) identifying the manufacturer of the wireless power receiver 200, information indicating the presence or absence of an extension device identifier. 5234 and a basic device identifier 5235. In addition, when it is indicated that the extended device identifier exists in the information 5342 indicating the presence or absence of the extended device identifier, an Extended Identification Packet 5300 including the extended device identifier as shown in FIG. It can be sent separately. The packet 5300 may be configured to include a header 5320 indicating that the packet is an extension device identifier, and a message 5330 including an extension device identifier. When the extended device identifier is used as described above, in order to identify the wireless power receiver 200 based on the manufacturer's identification information 5333, the basic device identifier 5235, and the extended device identifier 5330. Information can be used.

In the identification and setting state 630, the wireless power receiver 200 may transmit a power control message including information on the expected maximum power. To this end, the wireless power receiver 200 may transmit, for example, a configuration packet 5400 as illustrated in FIG. 16. The packet may be configured to include a header 5420 indicating that it is a configuration packet and a message 5430 containing information on the expected maximum power. The message 5430 includes a power class 5431, information 5432 about the expected maximum power, an indicator 5433 indicating how to determine the current of the primary cell on the wireless power transmission side, 5434). The indicator 5433 may indicate whether or not the current of the main cell of the wireless power transmission apparatus side is to be determined as specified in the protocol for wireless power transmission.

Meanwhile, the wireless power transmitter 100 may generate a power transfer contract used for power charging with the wireless power receiver 200 based on the identification information and / or setting information. The power transfer protocol may include limits of parameters that determine the power transfer characteristics in the power transfer state 640. [

The wireless power transmitter 100 may end the identification and setting state 630 before returning to the power transfer state 640 and return to the selection state 610. For example, the wireless power transmitter 100 may end the identification and setup state 630 to find another wireless power receiver capable of receiving power wirelessly.

4) power transmission status ( Power Transfer Phase )

The wireless power transmitter 100 in the power transmission state 640 transmits power to the wireless power receiver 200.

The wireless power transmitter 100 receives a power control message from the wireless power receiver 200 while transmitting power, and adjusts a characteristic of power applied to the transmission coil in response to the received power control message. Can be. For example, the power control message used to adjust the power characteristic of the transmitting coil may be included in a control error packet 5500 as shown in FIG. 17. The packet 5500 may be configured to include a header 5520 indicating that the packet is a control error packet and a message 5530 including a control error value. The wireless power transmission apparatus 100 may adjust the power applied to the transmission coil according to the control error value. That is, the current applied to the transmission coil is maintained when the control error value is 0, decreased when the control value is a negative value, and can be adjusted to increase when the control value is a positive value.

In the power transmission state 640, the wireless power transmission apparatus 100 may monitor parameters in a power transfer contract generated based on the identification information and / or the setting information. The wireless power transmitter 100 cancels the power transmission when the parameters are monitored and the power transmission with the wireless power receiver 200 violates the limitations included in the power transfer protocol. The selection state 610 may be returned.

The wireless power transmitter 100 may end the power transfer state 640 based on a power control message transmitted from the wireless power receiver 200.

For example, when the charging of the battery is completed while charging the battery using the transferred power, the wireless power receiver 200 requests power to stop the wireless power transmission to the wireless power transmitter 100. You can pass control messages. In this case, the wireless power transmission apparatus 100 may terminate the wireless power transmission and return to the selected state 610 after receiving the message requesting the suspension of the power transmission.

For another example, the wireless power receiver 200 may transmit a power control message requesting renegotiation or reconfigure to update a power transfer protocol that has already been generated. The wireless power receiver 200 may transmit a message requesting renegotiation of the power transfer protocol when a greater or less amount of power is required than the amount of currently transmitted power. In this case, the wireless power transmission apparatus 100 may terminate the wireless power transmission and return to the identification and setting state 630 after receiving the message requesting renegotiation of the power transfer protocol.

To this end, the message transmitted by the wireless power receiver 200 may be, for example, an end power transfer packet 5600 as illustrated in FIG. 18. The packet 5600 may be configured to include a message 5630 including a header 5620 indicating the power transmission interruption packet and a power transmission interruption code indicating the reason for the interruption. The power transfer stop code includes charge complete, internal fault, over temperature, over voltage, over current, battery failure, reset, It may indicate one of a no response or an unknown error.

Communication method of many electronic devices

Hereinafter, a method in which one or more electronic devices communicate from one wireless power transmitter using a wireless power signal will be described.

19 is a conceptual diagram illustrating a method of transmitting power to one or more wireless power receivers by a wireless power transmitter.

The wireless power transmitter 100 may transmit power for one or more wireless power receivers 200 and 200 '. Although two electronic devices 200 and 200 ′ are illustrated in FIG. 19, the method according to the embodiments disclosed herein is not limited to the number of illustrated electronic devices.

There is a difference between the active area and the detection area according to the wireless power transfer method of the wireless power transmitter 100. 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 supporting each wireless power transfer method may change the power transfer method for each wireless power receiver.

In the wireless power transmission according to the embodiments disclosed herein, when the wireless power transmitter 100 transmits power for one or more electronic devices 200 and 200 ′ in the same wireless power transfer method, the electronic device Fields 200 and 200 ′ may communicate with each other via the wireless power signal without collision with each other.

As shown in FIG. 19, the wireless power signal 10a formed by the wireless power transmitter 100 reaches the first electronic device 200 ′ and the second electronic device 200. The first electronic device 200 ′ and the second electronic device 200 may transmit a power control message using the formed wireless power signal.

The first electronic device 200 ′ and the second electronic device 200 operate as a power receiver for receiving a wireless power signal. The power receiver according to the embodiments disclosed in the present disclosure includes a power receiver 291 ′, 291 for receiving the formed wireless power signal; Modulation and demodulation units 293 'and 293 for performing modulation and demodulation on the received wireless power signal; And control units 292 'and 292 for controlling each component of the power receiver.

Furthermore, in the present invention, a method of selecting a communication protocol in a wireless charging system (or a wireless power transmission / reception device) using multiple communication protocols, a structure of a transmission device compatible with an inductive method and a resonant method in a wireless charging system, A communication method in a transmission apparatus compatible with a resonance method is proposed. This will be described in more detail below.

Furthermore, in the present invention, in order to ensure compatibility with the low power receiver of Chapter 3.2.2 Power Transmitter design MP-A2 during the "Wireless Power Transfer Volume II: Medium Power Part1: Interface Definition" in progress in WPC, Give a way. More specifically, a method of converting a driving method of a bridge circuit after receiving a 1st control error to convert a medium power (~ 15W) transmission system into a 5W reception system can be used. This will be described in more detail below.

Wireless power transmitter according to the power information of the wireless power receiver mode  How to switch The method of converting mode of wireless power transmitter according to  the power information of wireless power receiver }

Hereinafter, referring to FIGS. 20 to 32, a new phase is added between the identification & configuration phase of the Chapter 5 System Control and the power transfer phase in the Wireless Power Specification Part 1 System Description of the WPC to low power the middle power (~ 15W) system. (5W) Presents a technique that can be extended to the system.

First, a communication protocol method in a wireless power transceiver using middle power will be described with reference to FIGS. 20 to 23.

20 is a conceptual diagram illustrating a WPC communication flow, FIG. 21 is a communication flowchart in a method according to an embodiment of the present invention, FIG. 22 is a block diagram of a receiver identification packet, and FIG. 23 is a communication proposed in the present invention. Flow chart showing the flow.

The hardware of the middle power wireless power transmitter is configured in a full bridge form. In order to transmit higher power than before, it is configured as a full bridge type. At this time, if the power transmission to the existing 5W class receiver is full bridge type, voltage and current are largely induced, causing the receiver to fail.

Therefore, a method for delivering stable power to a 5W receiver as a middle power wireless power transmitter is needed.

When there is a middle power transmitter TX, the power transmission is stable in the middle power receiver RX. In addition, it is necessary to be compatible with the existing low power receiver system. To this end, in the present invention, the TX is to switch between the LC drive mode (half-bridge and full-bridge) stable and suitable for the low power receiving system and the middle power receiving system through the version (version) information collected from the RX.

According to the figure, a process of switching the LC driving mode by determining the version information of the identification packet collected from the RX at the time of receiving the 1st control error after the receiver recognition in the conventional WCP communication flowchart may be added.

As a more specific example, the wireless power transmitter of the present invention is adapted to use an inverter topology of full and half bridges. That is, the wireless power transmission apparatus has a power transfer unit in which the full bridge and the half bridge are switched.

The wireless power transmission method of the present invention first detects whether a wireless power receiver exists within a range capable of transmitting power wirelessly, and sends a detection signal to the wireless power receiver. This process is replaced with the details described above.

Next, at least one of identification information and setting information transmitted by the wireless power receiver is received (S120), and a control error packet (Control Error Packet) transmitted by the wireless power receiver is received (S130). Half-bridge driving may be performed as a previous step of collecting such information (S110). In this case, the process of switching to the LC driving mode by determining the version information of the identification packet collected from the RX at the time of receiving the 1st control error after the receiver recognition in the conventional WCP communication flowchart may be added. However, the present invention is not necessarily limited thereto, and for example, the maximum power information may be collected instead of the version information to determine whether the low power receiver or the middle power receiver.

Finally, the wireless power transfer method applies a combination of operating frequency, duty cycle, or power signal phase of the power signal to a full bridge or half bridge to determine the amount of power to be transmitted. To control. That is, the wireless power transmitter drives the power transmission unit as one of a full bridge and a half bridge based on whether the wireless power receiver corresponds to middle power or low power (S140). .

For example, after receiving a 1st control error from the middle power receiver through a negotiation phase with middle power, the inverter topology can be switched from half bridge to full bridge.

In this case, a problem may arise in receiving device stability depending on whether the initial driving is switched from half bridge to full bridge or full bridge to half bridge. This is because the rectifier stage voltage on the receiver side can be changed by 2 times or ½ times by switching only the driving method and frequency used in the recognition.

As a solution to this, the inverter topology is converted from half bridge to full bridge after receiving the first control error packet from the middle power wireless power receiver. When receiving the first control error packet, the size of the power to be transmitted may be selected using the version information of the identification packet collected from the wireless power receiver. More specifically, in this example, the initial driving is performed at a high gain frequency at the half bridge, the receiving apparatus confirms that the middle power, and after receiving the 1st control error, shifts to the low gain frequency when switching to the full bridge. This prevents the application of the transient voltage on the secondary side.

As an example, the transmitter drives the starting LC drive as a half bridge at a frequency where the receiver transmission power is high, and collects version information of the receiver when the receiver is recognized. At this time, the receiving device transmits its version information to the transmitting device through an identification packet (see Fig. 22). In the identification phase, the transmitter receives version information of the receiver.

The power transfer unit of the wireless power transmitter uses a voltage corresponding to the half bridge as an initial voltage, and thus the initial voltage of the half bridge may be 12V. The initial frequency can also be set to 135 to 145 kHz (duty cycle 50%). More specifically, in order to pass the test of the existing low power receiver, the frequency of digital receiver ping may be set to 140 kHz.

Next, when the version information of the receiver is 2.0 or more, the LC driving is switched from the half bridge to the full bridge, and when the version information of the receiving device is not 2.0, the driving of the half bridge is maintained. That is, when the version information of the receiving device is 2.0 or more, the transmitting device switches power to the full bridge. When switching from the half bridge to the full bridge, the driving frequency may be shifted (S150).

As such, the wireless power transmitter starts driving the LC in the half bridge and determines whether to switch to the full bridge using the version information.

When switching from half bridge to full bridge, TX sets the starting frequency in a range that does not damage the rectifier stage in RX. For example, if only the driving method is changed to the same frequency, the gain value is doubled, so if RX is less than two times, the start frequency of TX can be set to 140khz or more. That is, the driving frequency in the full bridge can be more than 140kHz.

24 and 25 are conceptual diagrams illustrating an example of using middle power, and FIGS. 26 and 27 are diagrams illustrating circuits driven by full and half bridges, respectively.

According to FIG. 24, it can be seen that the output power corresponds to a full bridge in each case where the duty cycle is 40% and the phase shift is 80%. Therefore, in the half bridge in which the voltage is applied only to the drive 1 as shown in FIG. 25, the voltage can be shifted to the full bridge by applying a phase shift to the drives 1 and 2, respectively.

More specifically, the driving frequency range is f _op = 110 to 205 kHz, and the phase change range in the full bridge can be 80 to 100%. When f _op = 205 kHz, the driving frequency range can be 50 to 100%.

The duty cycle range in the half bridge at f _op = 110 to 205 kHz can be 40 to 50%. Also, when f _op = 205 khz, the duty cycle range can be 25 to 50%.

High drive frequency or low phase, low duty cycle can result in low throughput. Therefore, for sufficient transmission amount, the driving frequency can be controlled with the following resolution.

0.07 x fop - 0.5 kHz for f _op in the 110 to 140 kHz range;

0.006 x fop - 0.4 kHz for f _op in the 140 to 205 kHz range;

In hardware, referring to FIG. 26, in the full bridge mode, the microcomputer output terminal PWM2 pulse is generated and driven in the form of an inverted signal or phase shift of PWM1. In the half bridge mode, the microcomputer output terminal PWM2 pulse is ground-generated and driven as shown in FIG. 27, and accordingly, the half bridge output is shown as in the first figure of FIG. 25. This hardware configuration can be modified in many forms.

28 and 29 are diagrams showing modifications of the circuit driven by the full bridge and the half bridge, respectively.

In the previous embodiment, unlike in the case of using the synchronous gate driver, in this embodiment, the driver is connected to each switch. In the full bridge mode, the microcomputer output terminal PWM3,4 pulses are converted into the inverted signal or phase shift of PWM1,2. In the half bridge mode, micom output terminal PWM3 pulse is implemented as PWM1 inverted signal, PWM2 generates GND and PWM 4 generates High.

In addition, the present invention discloses another embodiment for switching the initial drive. Hereinafter, the other embodiment will be described in more detail with reference to FIGS. 30 to 32.

30 is a flowchart illustrating a communication flow proposed in another example of the present invention, and FIGS. 31 and 32 are conceptual views illustrating an example of using middle power in another example of the present invention.

Referring to the drawings, according to the present embodiment, initial driving (S210) is performed at full gain at a low frequency of low gain until receiving 1st control error according to the existing WPC communication flowchart, and version information is received and collected (S220). After confirming that the device is low power, and receives the 1st control error (S230), when switching to the half bridge, the gain is shifted to a low frequency to prevent the application of the transient voltage on the secondary side.

More specifically, when a digital ping low frequency of 205 kHz or more is required to pass a test for an existing low power compatible receiver, a phase shift of the full bridge driving signal is performed. ) Or the duty ratio. For example, the initial drive frequency is driven at 205khz full-duty, 40% duty.

In this case, when the version information of the receiving device is less than 2.0, the LC driving is switched from the full bridge to the half bridge (S240), and when it is not, the driving of the full bridge is maintained. When switching from a full bridge to a half bridge, the driving frequency may be changed (S250) to compensate for the problem when the amount of power delivered to the receiving side becomes low. As an example, the Tx coil MPA2 is driven at 205khz full bridge and 40% duty, but shifts to half-bridge 140khz when the version is less than 2.0.

As such, the receiver transmits its version information to the transmitter through an identification packet, and the transmitter maintains the existing LC driving method until a 1st control error is received, and is the receiver low power according to the version information of the receiver? The risk of applying a large voltage to the receiving device can be eliminated by determining whether the middle power is applied, switching the LC driving method and frequency shift corresponding thereto.

The configuration of the wireless power transmission apparatus according to the embodiments disclosed herein may be applied to devices such as a docking station, a cradle device, and other electronic devices, May be readily apparent to those skilled in the art.

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

Claims (20)

In the wireless power transmission method of the wireless power transmitter using a full bridge and half bridge inverter topology (Inverter topology),
Detecting whether a wireless power receiver exists within a range capable of transmitting power wirelessly;
Sending a detection signal to the wireless power receiver;
Receiving at least one of identification information and configuration information transmitted by the wireless power receiver;
Receiving a control error packet transmitted by the wireless power receiver; And
Applying a combination of driving frequency, duty cycle, or power signal phase to a full bridge or half bridge to control the amount of power to be transmitted. The method of claim 1,
And wherein the inverter topology is converted from half bridge to full bridge after receiving the first control error packet from the middle power wireless power receiver. 3. The method of claim 2,
And when the first control error packet is received, selecting the size of the power to be transmitted using the version information of the identification packet collected from the wireless power receiver. The method of claim 3,
And converting the driving frequency when the half bridge is switched from the half bridge to the full bridge. The method of claim 1,
And a power transfer unit of the wireless power transmitter uses a voltage corresponding to a half bridge as an initial voltage. The method of claim 1,
The wireless power transmitter drives the power transfer unit as either a full bridge or a half bridge based on whether the wireless power receiver corresponds to middle power or low power. . The method of claim 1,
The wireless power transmitter receives an identification packet from the wireless power receiver, and the identification packet includes version information of the wireless power receiver. The method of claim 7, wherein
The wireless power transmitter starts LC driving in a half bridge, and determines whether to switch to a full bridge using the version information. 9. The method of claim 8,
The wireless power transmitter converts from a half bridge to a full bridge when the version information corresponds to middle power, and maintains a half bridge when the version information corresponds to low power. The method of claim 1,
The driving frequency in the full bridge is a wireless power transmission method, characterized in that more than 140kHz. The method of claim 1,
And a driving frequency used for detecting whether the wireless power receiver exists is 140 kHz. In the wireless power receiving method for receiving wireless power from a wireless power transmitter using a full bridge and half bridge inverter topology,
Sending a detection signal to the wireless power transmitter;
Transmitting at least one of identification information and configuration information to the wireless power transmitter; And
Sending a control error packet to the wireless power transmitter;
The wireless power transmitter applies version information to the wireless power transmitter so that the wireless power transmitter applies a combination of driving frequency, duty cycle, or power signal phase to the full or half bridge to control the amount of power to be transmitted. Wireless power receiving method, characterized in that for transmitting. The method of claim 12,
The wireless power receiver transmits an identification packet to the wireless power transmitter, and the identification packet includes version information of the wireless power receiver. In the wireless power transmitter using a full bridge and half bridge inverter topology,
The wireless power transmitter,
Detecting whether a wireless power receiver exists within a range capable of transmitting power wirelessly;
Sending a detection signal to the wireless power receiver;
Receiving at least one of identification information and configuration information transmitted by the wireless power receiver;
Receiving a control error packet transmitted by the wireless power receiver; And
And applying a combination of driving frequency, duty cycle, or power signal phase to a full or half bridge to control the amount of power to be transmitted. 15. The method of claim 14,
And wherein the inverter topology is converted from half bridge to full bridge after receiving the first control error packet from the middle power wireless power receiver. 15. The method of claim 14,
And when the first control error packet is received, selecting the size of the power to be transmitted using the version information of the identification packet collected from the wireless power receiver. 17. The method of claim 16,
And converting the driving frequency when the half bridge is switched from the half bridge to the full bridge. 15. The method of claim 14,
The wireless power transmitter receives an identification packet from the wireless power receiver, and the identification packet includes version information of the wireless power receiver. A wireless power transmission device configured to transmit wireless power; And
A wireless power receiver configured to receive the wireless power transmitted from the transmitter;
The power transfer unit of the wireless power transmitter includes an LC circuit configured to switch between a full bridge and a half bridge,
The wireless power receiver is configured to inform whether the wireless power receiver corresponds to middle power or low power so that the transmitter determines whether to drive the power transmission unit in a full bridge or a half bridge. Wireless charging system. 20. The method of claim 19,
The wireless power transmitter and the wireless power receiver,
Detecting whether the wireless power receiver exists within a range in which the wireless power transmitter can transmit power wirelessly;
Sending, by the wireless power transmitter, a detection signal to the wireless power receiver;
Receiving at least one of identification information and setting information transmitted from the wireless power receiver by the wireless power transmitter;
Receiving a control error packet transmitted by the wireless power receiver in the wireless power transmitter; And
And based on indicating whether the wireless power receiver corresponds to middle power or low power, the wireless power transmitter performs the step of driving the power transmission unit to one of a full bridge and a half bridge. Wireless charging system.

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