KR102099819B1 - Wireless power transfer method, apparatus and system - Google Patents

Abstract

The present invention, in a wireless power transmission method of a wireless power transmission device using a full-bridge and half-bridge inverter topology (inverter topology), detects whether the wireless power receiver is present within a range that can transmit power wirelessly And 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 a control error packet transmitted by the wireless power receiver. (Control Error Packet), and applying a combination of driving frequency, duty cycle or power signal phase to the full bridge or half bridge to provide a wireless power transmission method comprising the step of controlling the amount of power to be transmitted do.

Description

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

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

Instead of traditionally supplying electrical energy by wire to wireless power receivers, a method of supplying electrical energy wirelessly without contact has been recently used. A wireless power receiver that wirelessly receives energy may be driven directly by the received wireless power, or may be driven by charging the battery and charging the battery using the received wireless power.

The Wireless Power Consortium, which covers technologies for magnetically induced wireless power transmission, described the wireless power transmission system manual, Volume 1, on April 12, 2010, regarding interoperability in wireless power transmission. Standard document of "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)" has been released. The standard document of the wireless power consultative body describes a method of transmitting power from one wireless power transmitter to one wireless power receiver by a magnetic induction method.

The version 1.00 is related to low power of 5W power transmission and reception, and the standard for the power transmission and reception of 5W or more is expected to be advanced, although the worries about the power transmission of 5W or more in the wireless power transmission currently stipulated by the WPC are not determined. do.

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

Another object of the present invention is to provide a standard that enables the compatibility of middle power and low power by transmitting and receiving signals in a different form 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 a wireless power transmission method of a wireless power transmission device using an inverter topology of a full bridge and a half bridge, the power wirelessly Detecting whether a wireless power receiving device exists within a transmittable range, sending a detection signal to the wireless power receiving device, and receiving at least one of identification information and setting information transmitted by the wireless power receiving device And a combination of driving frequency, duty cycle, or power signal phase applied to the full bridge or half bridge, thereby receiving the control error packet transmitted by the wireless power receiver. And controlling the size of the.

In addition, according to an example of the present invention, the inverter topology is converted from a half bridge to a 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 the half bridge is switched to the full bridge, the driving frequency may be shifted.

In addition, according to another example of the present invention, the power transmission unit of the wireless power transmission apparatus uses a voltage corresponding to a half bridge as an initial voltage.

The wireless power transmission device may drive the power transmission unit to either a full bridge or a half bridge based on the wireless power receiving device informing whether it corresponds to middle power or low power.

In addition, according to another example 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 the LC driving on the half bridge, and it is possible to determine whether to switch to the full bridge using the version information. When the version information corresponds to middle power, the wireless power transmitter may switch from half bridge to full bridge, and if the version information corresponds to low power, maintain the half bridge.

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

In addition, the present invention is a wireless power receiving method for receiving wireless power from a wireless power transmitter using an inverter topology of a full bridge and a half bridge, sending a detection signal to the wireless power transmitter, And transmitting at least one of identification information and setting information to the wireless power transmission device, and sending a control error packet to the wireless power transmission device, wherein the wireless power transmission device has a driving frequency, A wireless power receiver characterized in that the wireless power receiver transmits version information to the wireless power transmitter to control the amount of power to be transmitted by applying a combination of duty cycle or power signal phase to the full bridge or half bridge. The method is disclosed.

In addition, the present invention is a wireless power transmission device using an inverter topology of a full bridge and a half bridge, wherein the wireless power transmission device, the wireless power receiving device within a range that can transmit power wirelessly Detecting whether a signal is detected, sending a detection signal to the wireless power receiving device, receiving at least one of identification information and setting information transmitted by the wireless power receiving device, and transmitting the wireless power receiving device. Receiving a control error packet, and applying a combination of driving frequency, duty cycle, or power signal phase to the full bridge or half bridge to control the amount of power to be transmitted. Disclosed is a wireless power transmission device.

In addition, the present invention 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 to determine whether the transmitter will drive the power transmission unit to either a full bridge or a half bridge. Disclosed is a wireless charging system characterized in that it is made to inform whether it corresponds to middle power or low power.

The present invention proposes an LC resonance driving method for compatibility between wireless power transmitters and receivers of different power capacities, thereby broadening the application range of wireless power transmitters and receivers. More specifically, different power receivers may be compatible between wireless chargers by introducing a method in which the transmitting device detects whether the receiving device is low power or middle power and selects the 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 among “Wireless Power Transfer Volume II: Medium Power Part 1: Interface Definition” in progress at WPC. After receiving, convert the driving method of the bridge circuit so that the medium power (~ 15W) transmission system is compatible with the 5W reception system.

1 is an exemplary diagram conceptually illustrating a wireless power transmitter and a wireless power receiver according to embodiments of the present invention.
2A and 2B are block diagrams exemplarily 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 in which power is wirelessly transmitted from a wireless power transmitter to a wireless power receiver according to an inductive coupling method.
4 is a block diagram exemplarily showing a part of the configuration of a wireless power transmitter and a wireless power receiver of a magnetic induction method employable in the embodiments disclosed herein.
5 is a block diagram of a wireless power transmitter configured to have one or more transmitting coils that receive power according to an inductive coupling method employable in embodiments disclosed herein.
6 illustrates a concept in which power is wirelessly transmitted from a wireless power transmitter to a wireless power receiver according to a resonance coupling method.
7 is a block diagram illustrating a part of the configuration of a wireless power transmitter and a wireless power receiver of a resonance method employable in the embodiments disclosed herein.
8 is a block diagram of a wireless power transmitter configured to have one or more transmission coils that receive power according to a resonant coupling scheme employable in embodiments disclosed herein.
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 disclosed herein.
10 illustrates a configuration for transmitting and receiving a power control message in wireless power transmission according to embodiments disclosed herein.
11 shows a form of a signal in modulation and demodulation performed in wireless power transmission according to embodiments disclosed herein.
12 illustrates a packet including a power control message used in a wireless power transfer method according to embodiments disclosed herein.
13 illustrates operating states of a wireless power transmitter and a wireless power receiver according to embodiments disclosed herein.
14 to 18 show 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 in which a wireless power transmitter transmits power to one or more wireless power receivers.
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 configuration diagram of a receiver identification packet.
23 is a flow chart 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 block diagrams showing circuits driven by a full bridge and a half bridge, respectively.
28 and 29 are configuration diagrams showing modified examples of circuits driven by full bridges and half bridges, respectively.
30 is a flow chart showing a communication flow proposed in 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 herein is not limited thereto, and may be applied to all power transmission systems and methods, wireless charging circuits and methods, and other methods and devices using wirelessly transmitted power to which the technical spirit of the technology may be applied. .

It should be noted that the technical terms used in this specification are only used to describe specific embodiments and are not intended to limit the present invention. In addition, technical terms used in this specification should be interpreted as meanings generally understood by a person having ordinary knowledge in the technical field to which the present invention belongs, unless defined otherwise. It should not be interpreted as a meaning, or an excessively reduced meaning. In addition, when the technical term used in this specification is a wrong technical term that does not accurately represent the spirit of the present invention, it should be understood as being replaced by a technical term that can be correctly understood by those skilled in the art. In addition, the general terms used in the present invention should be interpreted as defined in the dictionary or in context before and after, and should not be interpreted as an excessively reduced meaning.

In addition, the singular expression used in this specification includes the plural expression unless the context clearly indicates otherwise. In the present application, the terms "consisting of" or "comprising" should not be construed as including all of the various components, or various steps described in the specification, among which some components or some steps It may not be included, or it should be construed to further include additional components or steps.

In addition, the suffixes "module" and "part" for the components used in the present specification are given or mixed only in consideration of the ease of writing the specification, and do not have a meaning or a role distinguished from each other by itself.

Further, terms including ordinal numbers such as first and second used in the present specification may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components. For example, the first component may be referred to as a second component without departing from the scope of the present invention, and similarly, the second component may be referred to as a first component.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings, but the same or similar elements will be given the same reference numbers regardless of the reference numerals, and redundant descriptions thereof will be omitted.

In addition, in the description of the present invention, when it is determined that detailed descriptions of related known technologies may obscure the subject matter of the present invention, detailed descriptions thereof will be omitted. In addition, it should be noted that the accompanying drawings are only for easy understanding of the spirit of the present invention and should not be interpreted as limiting the spirit of the present invention by the accompanying drawings.

Justice

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

One-way communication: A communication method in which the receiver sends the necessary message only to the transmitter

Two-way communication: A transmitter is a receiver, and a receiver is a transmitter.

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

Concept diagram of wireless power transmitter and wireless power receiver

1 is an exemplary diagram conceptually illustrating 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 wirelessly transmits power 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 wirelessly transmitting power.

In addition, the wireless power transmitter 100 may be embodied as various types of devices that transmit power to the wireless power receiver 200 that requires power while not in contact.

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.

On the other hand, the wireless power receiving device for wirelessly receiving power described in the present specification includes all portable electronic devices, such as input / output devices such as a keyboard, mouse, auxiliary output device for video or voice, mobile phones, cellular phones, and smart devices. It should be interpreted as encompassing smart phones, PDAs (Personal Digital Assistants), PMPs (Portable Multimedia Players), and tablets or multimedia devices.

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

Meanwhile, the wireless power transmitter 100 may wirelessly transmit power to the wireless power receiver 200 without mutual contact using one or more wireless power transfer methods. That is, the wireless power transmission apparatus 100 has an inductive coupling method based on the magnetic induction phenomenon by the wireless power signal and a resonance coupling based on electromagnetic resonance phenomenon by the wireless power signal of a specific frequency (Magnetic Resonance Coupling). ) Can transmit power using one or more of the methods.

The wireless power transmission by the inductive coupling method is a technique of transmitting power wirelessly 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 changing in one coil by a magnetic induction phenomenon. It says that it is delivered.

In the wireless power transmission by the resonance coupling method, resonance occurs in the wireless power receiver 200 by the wireless power signal transmitted from the wireless power transmitter 100, and the wireless power transmitter by the resonance phenomenon It means that 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 each drawing below, the same reference numerals are used for the same components as much as possible even though they are indicated on different drawings.

2A and 2B are block diagrams exemplarily illustrating configurations of the wireless power transmitter 100 and the wireless power receiver 200 employable in the embodiments disclosed herein.

Wireless power transmitter

Referring to Figure 2A, the wireless power transmission device 100 is configured to include a power transmission unit (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 conversion unit 111 converts the power supplied from the transmission-side power supply unit 190 into a wireless power signal and transmits it 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 electro-magnetic field having oscillation characteristics. To this end, the power converter 111 may be configured to include a coil generating the wireless power signal.

The power converter 111 may include components for forming wireless power signals of different types according to each power transmission method. 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) that forms a magnetic field with a specific resonance frequency in order to generate a resonance phenomenon in the wireless power receiver 200 according to the resonance coupling method. have.

In addition, the power converter 111 may transmit power using one or more of the above-described inductive coupling method and resonant coupling method.

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

On the other hand, the power converter 111 may be configured to further include a circuit that can adjust the characteristics of the frequency, applied voltage, current, etc. 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.

Meanwhile, an area in which the wireless power signal can reach can be divided into two types. First, an active area refers to an area through which a wireless power signal transmitting power to the wireless power receiver 200 passes. Next, a semi-active area refers to an area of interest in which the wireless power transmitter 100 can detect the presence 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 sensing area. Specifically, the power transmission control unit 112 uses the wireless power signal formed in the power conversion unit 111, or the wireless power receiving device 200 is connected to the active area or the detection area by a separately provided sensor. It can be detected whether it has been deployed. For example, the power transmission control unit 112 is affected by the wireless power signal due to the wireless power receiving device 200 present in the detection area, thereby forming the wireless power signal of the power conversion unit 111. The presence of the wireless power receiver 200 may be detected by monitoring whether the power characteristics for the power change. However, the active area and the sensing area may be different according to a wireless power transmission method such as an inductive coupling method and a resonance coupling method.

The power transmission control unit 112 may perform a process of identifying the wireless power receiving device 200 or determine whether to start wireless power transmission according to a result of detecting the presence of the wireless power receiving device 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 characteristics may be made according to the conditions of the wireless power transmitter 100 side or the conditions of the wireless power receiver 200 side.

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

For example, the power transmission control unit 112 forms the wireless power signal according to a power control message including one or more of rectified power amount information, charging state information, and identification information of the wireless power receiver 200 It can determine the characteristics of one or more of the frequency, current, and voltage used.

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

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 transmitter 100 may be further configured to further include a power communication modulation / demodulation unit 113 that is electrically connected to the power conversion unit 111. . The modulation / demodulation unit 113 may be used to demodulate the wireless power signal modulated by the wireless power reception device 200 to receive the power control message.

In addition, in some embodiments, the power transmission control unit 112 receives a power control message by receiving user data including a power control message by a communication means (not shown) included in the wireless power transmission device 100. It can also be obtained.

[In-band two-way communication is supported]

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

Wireless power receiver

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

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

The power receiving unit 291 may include components necessary to receive the wireless power signal according to a wireless power transmission method. In addition, the power receiver 291 may receive power according to one or more wireless power transmission methods, and in this case, the power receiver 291 may include components required for each other according to each method.

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

For example, as a component according to the inductive coupling method, the power receiver 291 may include a secondary coil through which current is induced by a changing magnetic field. In addition, the power receiving unit 291 is a component according to the resonance coupling method and may include a coil and a resonance circuit in which a resonance phenomenon is generated by a magnetic field having a specific resonance frequency.

However, when the power receiving unit 291 receives power according to one or more wireless power transmission methods, the power receiving unit 291 is implemented to receive using one coil, or is formed differently according to each power transmission method It may be implemented to receive using a coil.

The components included in the power receiver 291 will be described later with reference to FIG. 4 for those that follow the inductive coupling method, and with reference to FIG. 7 for those that follow the resonance coupling method.

Meanwhile, the power receiving unit 291 may further include a rectifier and a regulator for converting the wireless power signal into direct current. In addition, the power receiver 291 may further include a circuit to prevent overvoltage or overcurrent from being generated by the received power signal.

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

Specifically, the power reception control unit 292 may transmit a power control message to the wireless power transmission device 100. The power control message may indicate to the wireless power transmitter 100 to start or end the transmission of the wireless power signal. Also, the power control message may indicate to the wireless power transmitter 100 to adjust the characteristics of the wireless power signal.

In order to transmit the power control message, the power receiving 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 further configured to further include a power communication modulator / demodulation unit 293 electrically connected to the power receiver 291. The modulation / demodulation unit 293 may be used to transmit the power control message through the wireless power signal, as in the case of the wireless power transmitter 100 described above. The modulation / demodulation 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 modulation / demodulation units 113 and 293 on the wireless power transmitter 100 side and the wireless power receiver 200 side for transmission and reception of a power control message through a wireless power signal. do.

The wireless power signal formed by the power conversion unit 111 is received by the power reception unit 291. At this time, the power receiving control unit 292 controls the modulation / demodulation unit 293 on the wireless power receiving apparatus 200 side to modulate the wireless power signal. For example, the power receiving control unit 292 may perform a modulation process to change the amount of power received from the wireless power signal accordingly by changing the reactance of the modulation / demodulation unit 293 connected to the power receiving unit 291. have. The change in the amount of power received from the wireless power signal causes a change in the current and / or voltage of the power converter 111 forming the wireless power signal. At this time, the modulation / demodulation unit 113 on the wireless power transmission apparatus 100 side detects a change in the current and / or voltage of the power conversion unit 111 and performs a demodulation process.

That is, the power receiving control unit 292 generates a packet including a power control message to be delivered to the wireless power transmitter 100, modulates the wireless power signal to include the packet, and modulates the power. The transmission control unit 112 may obtain the power control message included in the packet by decoding the packet based on a result of performing the demodulation process of the modulation / demodulation unit 113.

In addition, in some embodiments, the power reception control unit 292 transmits user data including a power control message by a communication means (not shown) included in the wireless power reception device 200, thereby controlling the power control message. It may be transmitted to the wireless power transmission device 100.

[In-band two-way communication is supported]

In addition, in a wireless power transmission environment capable of two-way communication according to the embodiments disclosed herein, the power reception control unit 292 may receive data transmitted from the wireless power transmission device 100. Data transmitted from the wireless power transmission apparatus 100 may be to request transmission of 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 receiving device 200 receiving power for operation from the power supply unit 290 operates by the power delivered from the wireless power transmitter 100 or the battery using the transmitted power After charging 299, the battery 299 may be operated by the electric power charged. At this time, the power receiving control unit 292 may control the charging unit 298 to perform charging using the transmitted power.

Hereinafter, a wireless power transmitter and a wireless power receiver applicable to the embodiments disclosed herein will be described. First, referring to FIGS. 3 to 5, a method is disclosed in which the wireless power transmitter transmits power to the wireless power receiver according to an inductive coupling method.

Inductive coupling method

3 illustrates a concept in which power is wirelessly transmitted from a wireless power transmitter to a wireless power receiver according to an inductive coupling method.

When the power transmission of the wireless power transmission device 100 follows an inductive coupling method, when the intensity of the current flowing in the primary coil in the power transmission unit 110 changes, the primary coil is applied by the current. The passing magnetic field changes. The magnetic field changed as described above generates an induced electromotive force on the secondary coil side in the wireless power receiver 200.

According to this method, the power conversion unit 111 of the wireless power transmission device 100 is configured to include a transmission coil (Tx coil) 1111a that operates as a primary coil in magnetic induction. In addition, the power receiving unit 291 of the wireless power receiving apparatus 200 is configured to include a receiving coil (Rx coil) 2911a that operates as a secondary coil in magnetic induction.

First, the wireless power transmitter 100 and the wireless power receiver 200 so that the transmitting coil 1111a on the wireless power transmitter 100 side and the receiving coil on the wireless power receiver 200 side are close together. Is placed. Thereafter, when the power transmission control unit 112 controls the current of the transmission coil 1111a to change, the power reception unit 291 uses the electromotive force induced in the reception coil 2911a to generate the wireless power reception device ( 200) is controlled to supply power.

The efficiency of wireless power transmission by the inductive coupling method is less affected by frequency characteristics, but is aligned between the wireless power transmitter 100 and the wireless power receiver 200 including each coil. And distance.

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

In addition, an array indicating unit (not shown) may be formed at an upper portion of the interface surface to indicate a location where the wireless power receiver 200 will be placed. The arrangement indicating unit indicates the position of the wireless power receiving apparatus 200 in which the arrangement between the transmitting coil 1111a and the receiving coil 2911a mounted on the lower portion of the interface surface can be suitably performed. The arrangement indicator may be simple marks or may be formed in the form of a protruding structure that guides the position of the wireless power receiver 200. Alternatively, the alignment indicator is formed in the form of a magnetic material, such as a magnet mounted on the lower portion of the interface surface, so that the coils are properly arranged by mutual attraction with a magnetic material of another pole mounted inside the wireless power receiver 200 You can also guide to achieve.

Meanwhile, the wireless power transmitter 100 may be formed to include one or more transmission coils. The wireless power transmitter 100 may selectively increase the power transmission efficiency by selectively using a part of coils suitably arranged with the receiving coil 2911a of the wireless power receiver 200 among the one or more transmitting coils. The wireless power transmission apparatus 100 including the one or more transmission coils will be described later with reference to FIG. 5.

Hereinafter, configurations 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 exemplarily showing a part of the configuration of the wireless power transmitter 100 and the wireless power receiver 200 of the magnetic induction method employable in the embodiments disclosed herein. The 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. 290) will be described.

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

As described above, the transmission coil 1111a forms a magnetic field corresponding to the wireless power signal according to 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 modified by the inverter 1112 drives a resonant circuit including the transmission coil 1111a and a capacitor (not shown) so that a magnetic field is formed in the transmission coil 1111a. .

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

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

Therefore, the positioning unit 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. It includes a driving unit (not shown) for moving the transmission coil 1111a to be within a certain range, or rotating the transmission coil 1111a so that the centers of the transmission coil 1111a and the reception coil 2911a overlap. It can be configured to.

To this end, the wireless power transmission device 100 may further include a position detection unit (not shown) made of a sensor for detecting the position of the wireless power reception device 200, and the power transmission control unit 112 may control the positioning unit 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 with the wireless power receiving apparatus 200 through the modulation / demodulation unit 113, and control information on the received arrangement or distance. Based on the, it is possible to control the positioning unit 1114.

If the power conversion unit 111 is configured to include a plurality of transmission coils, the positioning unit 1114 may determine which of the plurality of transmission coils will be used for power transmission. The configuration of the wireless power transmission apparatus 100 including the plurality of transmission coils will be described later with reference to FIG. 5.

Meanwhile, the power conversion unit 111 may be configured to further include a power sensing unit 1115. The power sensing unit 1115 on the wireless power transmission device 100 side monitors the current or voltage flowing through the transmission coil 1111a. The power sensing unit 1115 is for checking whether the wireless power transmitter 100 is operating normally, and detects a voltage or current of a power source supplied from the outside, and determines whether the detected voltage or current exceeds a threshold value. Can be confirmed. The power sensing unit 1115, although not shown, compares a resistor for detecting the voltage or current of a power source supplied from the outside with a voltage value or a current value of the detected power source and a threshold value, and outputs the comparison result Comparators. 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 rectifying circuit 2913.

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

In addition, for increasing the reception efficiency of wireless power or for resonant detection, series / parallel capacitors may be configured to be connected to the receiving coil 2911a.

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 of the current in order to convert AC to DC. The rectifying circuit 2913 may be implemented as, for example, a full bridge rectifying circuit composed of four diodes, or a circuit using active components.

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

The modulation / demodulation unit 293 is connected to the power receiving unit 291, and may be configured as a resistive element in which resistance is changed for DC current, and as a capacitive element in which reactance is changed for AC current. Can be. The power reception control unit 292 may modulate the wireless power signal received by the power reception unit 291 by changing the resistance or reactance of the modulation / demodulation unit 293.

Meanwhile, the power supply unit 290 may be configured to further include a power sensing unit 2914. The power sensing unit 2914 on the wireless power receiver 200 side 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 the voltage of the rectified power When the current exceeds a threshold, the power receiving control unit 292 transmits a power control message to the wireless power transmitter 100 to deliver appropriate power.

A wireless power transmitter comprising one or more transmitting coils

5 is a block diagram of a wireless power transmitter configured to have one or more transmitting coils that receive power according to an inductive coupling method employable in embodiments disclosed herein.

Referring to FIG. 5, the power converter 111 of the wireless power transmitter 100 according to the 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 partially overlapping primary coils. An active region may be determined by some of the one or more transmission coils.

The one or more transmission coils 1111a-1 to 1111a-n may be mounted under the interface surface. Also, the power converter 111 may further include a multiplexer 1113 that establishes and releases connection of some of the one or more transmission coils 1111a-1 to 1111a-n. .

When the position of the wireless power receiving device 200 placed on the upper surface of the interface is sensed, the power transmission control unit 112 considers the sensed position of the wireless power receiving device 200 and the one or more transmitting coils ( Among the 1111a-1 to 1111a-n), the multiplexer 1113 can be controlled so that the coils that can be placed in an inductive coupling relationship with the receiving coil 2911a of the wireless power receiver 200 can be connected.

To this end, the power transmission control unit 112 may acquire location information of the wireless power receiving device 200. For example, the power transmission control unit 112 may acquire the position of the wireless power receiving device 200 on the surface of the interface by the position detecting unit (not shown) provided in the wireless power transmission device 100. You can. For 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, or Position information of the wireless power receiver 200 is obtained by receiving a power control message indicating the identification information of the object and determining which of the one or more transmitting coils is close to the position based on the received result You may.

Meanwhile, the active area is a part of the surface of the interface, and refers to a portion through which a high-efficiency magnetic field can pass when the wireless power transmitter 100 wirelessly transmits power to the wireless power receiver 200. You can. In this case, a single transmission coil or a combination of one or more transmission coils that form 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 area based on the detected position of the wireless power receiving device 200, and establishes a connection of a main cell corresponding to the active area to establish the wireless power receiving device ( The multiplexer 1113 may be controlled so that the receiving coil 2911a of 200 and the coils belonging to the main cell can be placed in an inductive coupling relationship.

Further, the power converter 111 may further include an impedance matching unit (not shown) that adjusts impedance to form a resonant circuit with the connected coils.

Hereinafter, a method of transmitting power according to a resonance coupling method by a wireless power transmission apparatus will be described with reference to FIGS. 6 to 8.

Resonant coupling method

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

First, the resonance (or resonance) is briefly described as follows. Resonance refers to a phenomenon in which the vibration system periodically receives an external force having the same frequency as its natural frequency, and the amplitude increases remarkably. Resonance is a phenomenon that occurs in all vibrations, such as mechanical and electrical vibrations. In general, when a force capable of vibrating the vibrometer is applied from the outside, if the natural frequency of the vibrometer and the force of the force applied from the outside are the same, the vibration becomes severe and the amplitude increases.

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

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

The resonance frequency may be determined by, for example, Equation 1 below.

[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 revolutions of the coil, etc., and the capacitance may be determined by an interval, area, or the like between the coils. In addition to the coil, a capacitive resonance circuit may be connected to determine the resonance frequency.

Referring to FIG. 6, when power is wirelessly transmitted according to a resonance coupling method, the power conversion unit 111 of the wireless power transmission apparatus 100 may include a transmission coil (Tx coil) 1111b in which a magnetic field is formed, and It may be configured to include a resonant circuit 1116 connected to the transmission coil 1111b and 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 configuration of the circuit element of the resonant circuit 1116 may be formed in various forms so that the power converter 111 may form a magnetic field, and is connected in parallel with the transmission coil 1111b as shown in FIG. 6. It is not limited.

In addition, the power receiving unit 291 of the wireless power receiving device 200 is a resonant circuit 2912 and a receiving coil (Rx coil) configured to cause a resonance phenomenon by a magnetic field formed in the wireless power transmitting device 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 the same as the resonance frequency of the formed magnetic field.

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

The specific vibration frequency in the wireless power transmitter 100 may be obtained by using Equation 1 with LTx and CTx. Here, when the result of substituting LRX and CRX of the wireless power receiver 200 into Equation 1 is the same as the specific vibration frequency, resonance occurs in the wireless power receiver 200.

According to the wireless power transmission method by resonant coupling, when the wireless power transmitter 100 and the wireless power receiver 200 resonate at the same frequency, electromagnetic waves are transmitted through a short-range electromagnetic field. There is no energy transfer between devices.

Therefore, while the efficiency of wireless power transmission by the resonance coupling method has a large influence on frequency characteristics, 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 the inductive coupling method.

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

Resonant coupling type wireless power transmitter

7 is a block diagram exemplarily showing a part of the configuration of the wireless power transmitter 100 and the wireless power receiver 200 of the resonance method employable in the embodiments disclosed herein.

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

The power conversion unit 111 of the wireless power transmission apparatus 100 may be configured to include a transmission coil (Tx coil) 1111b, an inverter 1112, and a resonance circuit 1116. The inverter 1112 may be configured to be connected to the transmission coil 1111b and the resonance circuit 1116.

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

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

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

In addition, the power conversion unit 111 may be configured to 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 inductance and capacitance in a circuit constituting the power conversion unit 111 according to Equation 1, the power transmission control unit 112 may transmit the inductance and / or The resonance frequency of the power conversion unit 111 may be determined by controlling the frequency adjustment unit 1117 so that the capacitance is changed.

The frequency adjusting unit 1117 includes, for example, a motor capable of changing a capacitance by adjusting a distance between capacitors included in the resonant circuit 1116, or the number of revolutions of the transmission coil 1111b ( number of turns) or a motor that can change the inductance by adjusting its diameter, or it can be configured to include active elements that determine the capacitance and / or inductance.

Meanwhile, the power conversion unit 111 may be configured to further include a power sensing unit 1115. The operation of the power sensing unit 1115 is the same as described above.

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

In addition, the power receiving unit 291 of the power supply unit 290 may be further configured to further include a rectifying circuit 2913 that converts AC current generated by a resonance phenomenon into direct current. The rectifying circuit 2913 may be configured in the same manner as described above.

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

A wireless power transmitter comprising one or more transmitting coils

8 is a block diagram of a wireless power transmitter configured to have one or more transmission coils that receive power according to a resonant coupling scheme employable in embodiments disclosed herein.

Referring to FIG. 8, the power converter 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). Further, the power converter 111 may further include a multiplexer 1113 that establishes and releases connection of some of the one or more of the transmission coils 1111b-1 to 1111b-n. .

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

To this end, the frequency adjuster 1117 changes the 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. Can be configured to.

In - band communication

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 disclosed herein.

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 conversion unit 111.

The wireless power signal 10a formed by the power conversion unit 111 reaches the electronic device 200 and is received through the power receiving unit 291 included in the electronic device 200. The formed wireless power signal is received through a receiving coil 2911 included in the power receiving unit 291.

The power receiving control unit 292 controls the modulation / demodulation unit 293 connected to the power receiving unit 291 to modulate the wireless power signal while the electronic device 200 receives the wireless power signal. . When the received wireless power signal is modulated, the wireless power signal forms a closed-loop in a magnetic field or an electromagnetic field.

The wireless power transmitter 100 may detect the modulated wireless power signal 10b. The modulation / demodulation unit 113 may demodulate the detected 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 amplitude of the wireless power signal 10a formed by the power conversion unit 111 is changed by the modulation / demodulation unit 293 on the electronic device 200 side to transmit the wireless power. The modulation / demodulation unit 293 on the (100) side may be a backscatter modulation method for detecting the amplitude of the modulated wireless power signal 10b.

Modulation and demodulation of wireless power signals

Hereinafter, modulation and demodulation of packets 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 shows a form of a signal in modulation and demodulation performed in wireless power transmission according to embodiments disclosed herein.

Referring to FIG. 10, the wireless power signal received through the power receiving unit 291 on the electronic device 200 side is a wireless power signal 51 that is not modulated as shown in FIG. 11A. Resonant coupling is made between the electronic device 200 and the wireless power transmitter 100 according to the resonance frequency set by the resonance forming circuit 2912 in the power receiving unit 291, and the receiving coil 2911b 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 modulation / demodulation unit 293. The modulation / demodulation unit 293 may be configured to include a passive element 2831 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 transmission device 100. In this case, the packet may be input to the active element 2932 in the modulation / demodulation unit 293.

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

Hereinafter, a process in which the wireless power transmitter 100 acquires a power control message to be transmitted by the electronic device 200 from demodulated digital data will be described.

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

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

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

[In case of supporting in-band two-way communication]

As described above, FIG. 9 illustrates that the wireless power receiver 200 transmits a packet using a carrier signal 10a formed by the wireless power transmitter 100, but the wireless power transmission The device 100 may 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 modulation / 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 demodulation unit 293 is controlled to perform demodulation so that the power reception control unit 292 on the wireless power reception apparatus 200 side can acquire data from the modulated carrier signal 10a. You can.

Packet format

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

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

Referring to (a) of FIG. 12, 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 the 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 the data.

In addition, the header 511 may include an address field that identifies the originator 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 wants to transmit the packet 510, the electronic device 200 generates the packet 510 so 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, request, or response to the other party.

On the other hand, in some embodiments, the command packet 510 may be configured as illustrated in FIG. 12B. The header 511 included in the command packet 510 may be expressed in a certain size. For example, the header 511 may be two bytes in size.

The header 511 may be configured to include a destination address field. For example, the destination 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 (OGF). OGF is a value assigned to each group of commands for the electronic device 200, and OCF is a value assigned to each command existing in each group in which the electronic device 200 is included.

The message 512 may be expressed by dividing the parameter into a length field 5121 and a parameter value field 5202. That is, the sender of the packet 510 may configure the message in the form of a length-value pair (5121a-5122a, etc.) of one or more parameters necessary to represent the data to be transmitted.

Referring to (c) of FIG. 12, the wireless power transmitter 100 and the electronic device 200 are configured to add 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 to accurately detect a start bit of the command packet 510. The preamble 520 may be configured to repeat the same bit. 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.

Operation state ( Phases )

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

13 illustrates operating states of the wireless power transmitter 100 and the wireless power receiver 200 according to embodiments disclosed herein. Also, FIGS. 14 to 18 show structures of packets including a power control message between the wireless power transmitter 100 and the wireless power receiver 200.

Referring to FIG. 13, operating states of the wireless power transmitter 100 and the wireless power receiver 200 for wireless power transmission are a selection state 610 and a detection phase 620 , Identification and configuration state (Identification and Configuration Phase) 630, and may be divided into a power transfer state (Power Transfer Phase) 640.

In the selection state 610, the wireless power transmitter 100 detects whether objects exist within a range capable of transmitting power wirelessly, and in the detection state 620, the wireless power transmitter ( 100) sends a detection signal to the detected object, and the wireless power receiver 200 sends a response to the detection signal.

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

Hereinafter, each operation state will be described in detail.

1) Selection state ( 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 detection area. The sensing area, as described above, refers to an area in which an object in the corresponding area can affect the power characteristics of the power converter 111. Compared to the detection state 620, the detection process for selecting the wireless power receiving device 200 in the selection state 610 receives a response from the wireless power receiving device 200 using a power control message. Instead of the method, the power conversion unit of the wireless power transmitter 100 detects that the amount of power for forming a wireless power signal is changing and checks whether an object exists within a certain range. The detection process in the selection state 610 may be referred to as an analog detection process (analog ping) in that the object is detected using a wireless power signal without using a digital packet in the detection state 620 to be described later. .

The wireless power transmitter 100 in the selection state 610 may detect that an object enters or exits the detection area. In addition, the wireless power transmitter 100 may distinguish wireless objects 200 and other objects (eg, keys, coins, etc.) that can wirelessly transmit power among objects in the detection area. You can.

As described above, since a distance capable of transmitting power wirelessly is different according to an inductive coupling method and a resonant coupling method, sensing regions in which an object is detected in the selected state 610 may be different.

First, when power is transmitted according to an inductive coupling method, the wireless power transmitter 100 in the selected state 610 may monitor an interface surface (not shown) to detect the 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 upper surface of the interface. As described above, the wireless power transmitter 100 formed to include one or more transmission coils enters the detection state 620 in the selection state 610, and uses each coil in the detection state 620. By doing so, it is possible to check whether a response to the detection signal is transmitted from the object or to enter the identification state 630 and then determine whether 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 a resonance coupling method, the wireless power transmitter 100 in the selected state 610 changes one or more of the frequency, current, and voltage of the power converter due to an object in the detection area. By detecting it, the object can be detected.

On the other hand, the wireless power transmitter 100 in the selection state 610 may detect an object by at least one of the detection methods according to the inductive coupling method and the resonance coupling method. The wireless power transmitter 100 performs an object detection process according to each power transmission method, and then detects the object from a combination method for wireless power transmission in order to proceed to different states 620, 630, and 640 You can choose one way.

On the other hand, the wireless power transmitter 100 in the selected state 610 is a wireless power signal formed to detect an object and digital detection, identification, setting and power transmission in the subsequent states (620, 630, 640) In order to form a wireless power signal, characteristics such as frequency and intensity may be different. This select state 610 of the wireless power transmitter 100 corresponds to an idle phase for detecting an object, so that the wireless power transmitter 100 reduces power consumption in the standby, or is efficient. This is to enable a specialized signal to be generated for object detection.

2) Detection status ( Ping Phase )

The wireless power transmitter 100 in the detection state 620 performs a process of detecting the wireless power receiver 200 in the detection area through a power control message. Compared to 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 detection process (digital ping). have.

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

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

Meanwhile, the power control message corresponding to the response to the detection signal may be a message indicating the 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 (Signal Strength Packet) (5100) containing a message indicating the strength of the received wireless power signal in response to the detection signal as shown in FIG. ). The packet 5100 may be configured to include a header 5120 indicating that the packet is a signal strength signal and a message 5130 indicating the strength of the power signal received by the wireless power receiver 200. The strength of the power signal in the message 5130 may be a value indicating the degree of inductive coupling or resonant coupling for power transmission between the wireless power transmitter 100 and the wireless power receiver 200. have.

After receiving the response message for the detection signal and discovering 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, if the wireless power transmitter 100 does not find a wireless power receiver 200 that can transmit power, the operation state of the wireless power transmitter 100 returns to the selection state 610 You can.

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 to control power transmission to be efficiently performed.

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 an identification packet 5200 including a message indicating identification information of the wireless power receiver 200 as shown in FIG. 15A, for example. have. The packet 5200 may be configured to include a header 5220 indicating a packet indicating identification information and a message 5230 including identification information of the wireless power receiver. The message 5230 includes information indicating the version of the protocol for wireless power transmission (2531 and 5232), information identifying the manufacturer of the wireless power receiving device 200 (5233), information indicating the presence or absence of an extension device identifier It can be configured to include 5234 and the basic device identifier 5235. In addition, when it is indicated that the extension device identifier exists in the information 5234 indicating the presence or absence of the extension device identifier, an extended identification packet 5300 including the extension device identifier as shown in FIG. Can be transmitted separately. The packet 5300 may be configured to include a header 5320 indicating a packet indicating an extension device identifier and a message 5330 including the extension device identifier. When the extended device identifier is used as described above, based on the manufacturer's identification information 5233, the basic device identifier 5235, and the extended device identifier 5330 to identify the wireless power receiver 200 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 shown in FIG. 16. The packet may be configured to include a header 5420 indicating that it is a setup packet and a message 5430 including information on the expected maximum power. The message 5430 includes a power class 5331, information on the expected maximum power 5542, an indicator 5543 indicating how to determine the current of the main cell on the wireless power transmitter side, and the number of optional configuration packets ( 5434). The indicator 5303 may indicate whether the current of the main cell of the wireless power transmitter side is to be determined as specified in the protocol for wireless power transmission.

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

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

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 characteristics of power applied to the transmission coil in response to the received power control message. You can. For example, a power control message used to adjust power characteristics of the transmission 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 a control error packet and a message 5530 including a control error value. The wireless power transmission apparatus 100 may adjust power applied to the transmission coil according to the control error value. That is, the current applied to the transmission coil can be adjusted to be maintained when the control error value is 0, decreased when it is negative, and increased when it is positive.

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 configuration information. As a result of monitoring the parameters, when the power transmission with the wireless power receiver 200 violates the limitations included in the power transmission protocol, the wireless power transmitter 100 cancels the power transmission and The selection state 610 may be returned.

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

For example, when the charging of the battery is completed while the wireless power receiver 200 is charging the battery using the delivered power, power requesting to stop transmitting the wireless power to the wireless power transmitter 100 Control messages can be delivered. In this case, after receiving the message requesting to stop the power transmission, the wireless power transmission apparatus 100 may end the wireless power transmission and return to the selection state 610.

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

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 a power transmission interruption packet and a power transmission interruption code indicating the reason for the interruption. The power transmission interruption codes include Charge Complete, Internal Fault, Over Temperature, Over Voltage, Over Current, Battery Failure, Reconfigure, Either No Response or Unknown error can be indicated.

Communication method of multiple electronic devices

Hereinafter, a method of performing communication using one or more electronic devices from one wireless power transmission apparatus using a wireless power signal will be described.

19 is a conceptual diagram illustrating a method in which a wireless power transmitter transmits power to one or more wireless power receivers.

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 electronic devices shown.

The active area and the sensing area are different according to the wireless power transmission method of the wireless power transmitter 100. Accordingly, the wireless power transmitter 100 may include whether a wireless power receiving device disposed in an active area or sensing area of a resonance coupling method exists, or a wireless power receiving device disposed in an active area or sensing area of an inductive coupling method. You can determine if it exists. According to the determination result, the wireless power transmission apparatus 100 that supports each wireless power transmission method may change the power transmission method for each wireless power reception device.

In the wireless power transmission according to the embodiments disclosed herein, the electronic device when the wireless power transmitter 100 transmits power for one or more electronic devices 200 and 200 'in the same wireless power transmission method Fields 200 and 200 'may perform communication through 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 receiving device that receives a wireless power signal. The power receiving apparatus according to the embodiments disclosed herein includes: a power receiving unit 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 it may be configured to include a control unit 292 ', 292 for controlling each component of the power receiving device.

Furthermore, in the present invention, a communication protocol selection method in a wireless charging system (or wireless power transmission / reception device) using multiple communication protocols, a structure of a transmission device compatible with an induction method and a resonance method in a wireless charging system, and an induction method A communication method in a resonant compatible transmission device is provided. Hereinafter, this will be described in more detail.

Furthermore, in the present invention, to ensure compatibility with a low power receiver of Chapter 3.2.2 Power Transmitter design MP-A2 among "Wireless Power Transfer Volume II: Medium Power Part1: Interface Definition" in progress in WPC How to do it. More specifically, we propose a method to convert the driving method of the bridge circuit after receiving the 1st control error to make the middle power (~ 15W) transmission system compatible with the 5W reception system. Hereinafter, this will be described in more detail.

The wireless power transmitter according to the power information of the wireless power receiver mode  Conversion method ( 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 middle power (~ 15W) system is low power by adding a new phase between the Identification & configuration phase of the Chapter 5 System Control and the Power transfer phase among the Wireless Power Specification Part1 System Description of WPC. (5W) It presents a technology that can be extended to the system.

First, with reference to FIGS. 20 to 23, a description will be given of a communication protocol method in a wireless power transceiving device using middle power.

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

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

Therefore, there is a need for a method to deliver stable power to a 5W receiver using a middle power class wireless power transmitter.

It is natural that the power transmission is stable in the receiving device RX of the middle power when there is the transmitting device TX of the middle power, and additionally, it is necessary to be compatible with each other for the existing low power receiving system. To this end, in the present invention, TX is converted to a stable and suitable LC driving mode (half-bridge and full-bridge) for a low power receiving system and a middle power receiving system, respectively, through version information collected from RX.

According to the drawing, in the existing WCP communication flowchart, 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 may be added.

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

The wireless power transmission method of the present invention first detects whether a wireless power receiving device exists within a range capable of wirelessly transmitting power, and sends a detection signal to the wireless power receiving device. For this process, the details are replaced by the above-mentioned contents.

Next, at least one of identification information and configuration information transmitted from the wireless power receiver is received (S120), and a control error packet transmitted from the wireless power receiver is received (S130). Half-bridge driving may be performed as a preliminary step of collecting the information (S110). In this case, in the existing WCP communication flowchart, 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 may be added. However, the present invention is not necessarily limited thereto, and for example, it may be determined whether a low power receiving device or a middle power receiving device by collecting maximum power information instead of version information.

Finally, in the wireless power transmission method, a combination of an operating frequency, a duty cycle, or a phase of the power signal is applied to a full bridge or a half bridge to determine the amount of power to be transmitted. Control. That is, the wireless power transmission device drives the power transmission unit of the transmitting device as either a full bridge or a half bridge (S140) on the basis of notifying whether the wireless power receiving device corresponds to middle power or low power (S140). .

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

In this case, a problem may occur in the stability of the receiving device depending on whether to switch the initial driving from half bridge to full bridge or full bridge to half bridge. This is because the rectifier voltage on the receiving device side can suddenly change to 2 times or ½ times by switching only the LC driving method and frequency used for recognition.

As a solution to this, the inverter topology is converted from a half bridge to a 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. More specifically, in this example, the initial driving is performed at a frequency with a high gain in the half bridge, the reception device is confirmed to be a middle power, and a 1st control error is received and then shifted to a low gain frequency when switching to full bridge. The application of the transient voltage on the secondary side is prevented.

As an example of this, the transmitting device drives the starting LC drive as a half bridge at a frequency at which the receiving unit transmits high power, and when the receiving device is recognized, collects version information of the receiving device. 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 transmitting device receives version information of the receiving device.

The power transmission unit of the wireless power transmission device uses a voltage corresponding to the half bridge as an initial voltage, so the initial voltage of the half bridge may be 12V. In addition, the initial frequency may be set to 135 to 145khz (50% duty cycle). More specifically, in order to pass the test of the existing low power receiver, the frequency of digital receiver ping can be set to 140khz.

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

As described above, the wireless power transmitter starts LC driving on 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 to RX. As an example of use, if only the driving method is changed to the same frequency, the gain value is doubled, so if RX is required within 2 times, the starting frequency of TX can be set to 140khz or more. That is, the driving frequency in the full bridge may be 140 kHz or higher.

24 and 25 are conceptual views illustrating an example of using middle power, and FIGS. 26 and 27 are schematic views showing circuits driven by a full bridge and a half bridge, respectively.

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

As a more specific value, the driving frequency range is f _op = 110 to 205 kHz, and the phase change range in a full bridge may be 80 to 100%. In addition, when f _op = 205khz, the driving frequency range may be 50 to 100%.

When f _op = 110 to 205 khz, the duty cycle range in the half bridge may be 40 to 50%. In addition, when f _op = 205khz, the duty cycle range may be 25-50%.

High drive frequencies or low phase, low duty cycles can result in low transmission. Therefore, for a 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 full bridge mode, the microcomputer output terminal PWM2 pulse is generated and driven by an inverted signal form or phase shift of PWM1. In the half-bridge mode, the microcomputer output terminal PWM2 pulse is grounded and driven as shown in FIG. 27, and thus the half-bridge output is shown as in the first picture of FIG. The hardware configuration can be modified in various ways.

28 and 29 are configuration diagrams showing modified examples of circuits driven by full bridges and half bridges, respectively.

In the previous embodiment, unlike the synchronous gate driver used, the driver is connected to each switch in this embodiment, and in full bridge mode, the microcomputer output terminals PWM3 and 4 pulses are inverted signals of PWM1,2 or phase shift type. It is generated and driven, and in half-bridge mode, the microcomputer output terminal PWM3 pulse is implemented as a PWM1 inverted signal, and PWM2 is GND and PWM 4 is generated and driven.

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

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

Referring to the drawings, in the present embodiment, an initial drive (S210) is performed with a full bridge at a low gain frequency until a 1st control error is received according to an existing WPC communication flow chart, and version information is received and collected (S220). After confirming that the device is low power, and receiving a 1st control error (S230), when switching to a half bridge, shifting to a frequency with a low gain prevents application of a secondary voltage transient.

More specifically, when a low frequency of 205 kHz or more is required when a receiver digitizes in order to pass a test for a conventional low power compatible receiver, a phase shift of a full bridge driving signal is required. ) Or the duty ratio. For example, the initial driving frequency is 205khz full bridge and 40% duty.

In this case, if the version information of the receiving device is less than 2.0, the LC operation is switched from a full bridge to a half bridge (S240). Otherwise, the full bridge operation is maintained. When switching from a full bridge to a half bridge, the size of the power transmitted to the receiving side is lowered, and if it is a problem, the driving frequency may be changed (S250) to compensate for this. As an example of use, the Tx coil MPA2 is driven with a full bridge of 205khz, a duty of 40%, and if the version is less than 2.0, the frequency is shifted to a half bridge of 140khz.

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

The configuration of the wireless power transmission device according to the embodiment described in the present disclosure disclosed above is also applicable to devices such as a docking station, a terminal cradle device, and other electronic devices, except when applicable only to a wireless charger. It will 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 described in the spirit and claims of the present invention.

Claims (20)

In the wireless power transmission device for transmitting the wireless power to the wireless power receiving device,
A primary coil configured to transmit wireless power to the wireless power receiving device using magnetic coupling with a secondary coil provided in the wireless power receiving device;
An inverter configured to convert the DC input to an AC waveform to drive the primary coil based on at least one of a half-bridge inverter topology and a full-bridge topology; And
It includes a power transmission control unit configured to control at least one of the operating frequency (operating frequency) or duty cycle (duty cycle) of the inverter,
The inverter transmits a ping signal to the wireless power receiver using the half-bridge inverter topology, and when the maximum power through the negotiation phase is greater than 5W, the wireless power transmitter is removed from the wireless power receiver. After receiving the 1 control error packet, characterized in that for converting from the half bridge inverter topology to the full bridge inverter topology, a wireless power transmission device. According to claim 1,
In response to converting from the half bridge inverter topology to the full bridge inverter topology, the wireless power transmission device, characterized in that the duty cycle is reduced. According to claim 1,
The power transmission control unit, characterized in that using the voltage corresponding to the half-bridge inverter topology as an initial voltage, a wireless power transmission device. According to claim 1,
The power transmission control unit receives an identification packet from the wireless power receiver,
The identification packet, characterized in that it comprises a version information for the wireless power receiver, a wireless power transmitter. According to claim 1,
The power transmission control unit is configured to initially drive the LC circuit using the half bridge inverter topology, and after receiving the first control error packet, the topology of the inverter from the half bridge inverter topology to the full bridge inverter topology Wireless power transmission device, characterized in that to determine whether to switch to. According to claim 1,
The operating frequency is characterized in that initially belongs to a range of 135 kHz to 145 kHz, wireless power transmission device. A wireless power receiving device for receiving wireless power from a wireless power transmitting device,
A secondary coil configured to receive wireless power from the wireless power transmitter using magnetic coupling with a primary coil provided in the wireless power transmitter based on at least one of a half bridge inverter topology and a full bridge inverter topology. ;
A rectifier configured to rectify the wireless power to a DC output; And
And a power receiving control unit configured to receive a ping signal based on the half bridge inverter topology from the wireless power transmission device.
The secondary coil transmits the wireless power using the full bridge inverter topology in a condition that the maximum power through the negotiation phase is greater than 5W after the wireless power receiver transmits the first control error packet to the wireless power transmitter. Wireless power receiving device, characterized in that for receiving the wireless power from the device. The method of claim 7,
In response to the conversion to the full bridge inverter topology, characterized in that the duty cycle of the wireless power is reduced, the wireless power receiving device. The method of claim 7,
Wireless power receiver, characterized in that the operating frequency initially falls within the range of 135 kHz to 145 kHz. The method of claim 7,
Wireless power receiving device, characterized in that the voltage corresponding to the half-bridge inverter topology is used as the initial voltage. The method of claim 7,
The power receiving control unit transmits an identification packet to the wireless power transmitter,
The identification packet, characterized in that it comprises a version information for the wireless power receiver, the wireless power receiver. A method for transmitting wireless power to a wireless power receiving device performed by a wireless power transmitting device,
Converting the DC input into an AC waveform to drive a primary coil of a wireless power transmitter operating based on at least one of a half bridge inverter topology and a full bridge inverter topology;
Transmitting a ping signal to the wireless power receiver using the half bridge inverter topology;
Transmitting the wireless power to the wireless power receiving device using magnetic coupling between the primary coil and the secondary coil provided in the wireless power receiving device; And
And if the maximum power through the negotiation phase is greater than 5W, the wireless power transmitter converts the half bridge inverter topology to the full bridge inverter topology after receiving the first control error packet from the wireless power receiver. Way. The method of claim 12,
Wherein the wireless power is transmitted by controlling at least one of an operating frequency or a duty cycle of the inverter. The method of claim 13,
And in response to converting to the full bridge inverter topology, the duty cycle is reduced. A method for receiving wireless power from a wireless power transmission device, performed by a wireless power receiving device,
Receiving a ping signal from the wireless power transmitter using a half bridge inverter topology;
Transmitting a first control error packet to the wireless power transmitter using the half bridge inverter topology; And
After transmitting the first control error packet, receiving the wireless power from the wireless power transmitter converted from the half-bridge inverter topology to the full-bridge inverter topology under the condition that the maximum power through the negotiation phase is greater than 5W. How to.
delete delete delete delete delete

Images