JP2020188634A - Power transmission device, control method for power transmission device, and program - Google Patents

Abstract

To promptly and surely request a power receiving device to perform next processing by the power receiving device during a power transmission process by a power transmission device.SOLUTION: A power transmission device (TX100) wirelessly transmits power to a power receiving device (RX200), receives a first signal from the power receiving device (RX200) while the power transmission is being performed, and transmits a second signal including identification information identifying one or more processes requested for the power receiving device (RX200) to the power receiving device (RX200) in response to the first signal.SELECTED DRAWING: Figure 8

Description

The present invention relates to a power transmission device, a control method for the power transmission device, and a program.

In recent years, technological development of wireless power transmission systems such as non-contact charging systems has been widely carried out. Patent Document 1 discloses a power transmission device and a power receiving device conforming to a standard (hereinafter referred to as "WPC standard") established by the Wireless Power Consortium (WPC), which is a standardization body for non-contact charging. The WPC standard stipulates a method in which a power transmission device transmits an affirmative (ACK) or a negative (NAK) of the request as a response message to a request message transmitted from the power receiving device during power transmission processing. Further, Patent Document 2 discloses a power transmission device that transmits a request message for negotiating to change the output power value to the power receiving device when a temperature rise is detected during the power transmission process.

Japanese Unexamined Patent Publication No. 2016-007116 JP-A-2018-045845

The WPC standard does not specify how the power receiving device requires the power receiving device to perform the next processing during the power transmission process. According to Patent Document 2, a method of transmitting a message requesting negotiation for changing the output power value to the power receiving device during the power transmission process is disclosed as the next processing performed by the power receiving device. There is. However, in Patent Document 2, there is a possibility that the request message does not reach the power receiving device due to signal collision or the like without considering the timing of transmitting the message. Therefore, there may be a problem that the power transmission device cannot request a desired request from the power receiving device, or it takes time to request the next process due to the retransmission process or the like.

The present invention has been made in view of the above problems, and an object of the present invention is to promptly and surely request a power receiving device to perform the next processing by the power receiving device during the power transmission process.

The power transmission device according to one aspect of the present invention has the following configuration. That is, a power transmission means for transmitting power to the power receiving device, a receiving means for receiving a first signal from the power receiving device while the power transmitting means is transmitting power, and the receiving means. The second signal includes a transmission means for transmitting a second signal to the power receiving device in response to the first signal received by the power receiving device, and the second signal is one requested from the power receiving device. It is characterized by including identification information that identifies the above processing.

According to the present invention, the power transmission device can quickly and surely request the power receiving device to perform the next processing performed by the power receiving device during the power transmission process.

The block diagram which shows the structural example of the power transmission apparatus which concerns on embodiment. The block diagram which shows the structural example of the power receiving device which concerns on embodiment. The figure explaining the functional block of the power transmission apparatus which concerns on embodiment. The figure which shows the configuration example of the non-contact charging system. A flowchart showing the processing executed by the power transmission device. The flowchart which shows the processing procedure (S512 of FIG. 5A) which requests the execution of the power transmission stop processing. The flowchart which shows the processing procedure (S513 of FIG. 5A) which requests the execution of the foreign matter detection processing. The flowchart which shows the processing procedure (S514 of FIG. 5A) which requests the renegotiation of GP. A flowchart showing the processing executed by the power receiving device. The figure which shows the data structure of the request packet which a transmission device sends to a power receiving device. The figure which shows an example of the communication sequence of the wireless power transmission system which concerns on embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The following embodiments do not limit the invention according to the claims. Although a plurality of features are described in the embodiment, not all of the plurality of features are essential to the invention, and the plurality of features may be arbitrarily combined. Further, in the attached drawings, the same or similar configurations are designated by the same reference numbers, and duplicate description is omitted.

[System configuration]
FIG. 4 shows a configuration example of the non-contact charging system (wireless power transmission system) according to the present embodiment. This system includes a power transmission device 100 and a power reception device 200. In the following, the power transmission device may be referred to as TX, and the power receiving device may be referred to as RX. The TX100 and RX200 comply with the WPC standard. The RX200 receives electric power from the TX100 and enables the battery to be charged. The TX100 is an electronic device that wirelessly transmits power to the RX200 mounted on the charging stand of its own device. Hereinafter, the case where the RX200 is placed on the charging stand will be described as an example. However, when the TX100 transmits power to the RX200, the RX200 does not have to be placed on the charging stand as long as it is within the power transmission range of the TX100 (for example, the range shown by the broken line in FIG. 4).

Further, the RX200 and TX100 may have a function of executing an application other than non-contact charging. An example of the RX200 is a smartphone, and an example of the TX100 is an accessory device for charging the smartphone. The RX200 and TX100 may be storage devices such as tablets, hard disk devices and memory devices, and information processing devices such as personal computers (PCs). Further, the RX200 and TX100 may be, for example, an imaging device (camera, video camera, etc.). Further, the RX200 may be an automobile. Further, the TX100 may be a charger installed on a console or the like in an automobile.

This system performs wireless power transmission using an electromagnetic induction method for non-contact charging based on the WPC standard. That is, the RX200 and TX100 perform wireless power transmission for non-contact charging based on the WPC standard between the power receiving antenna of the RX200 and the power transmitting antenna of the TX100. The wireless power transmission method (non-contact power transmission method) applied to this system is not limited to the method specified by the WPC standard, but other electromagnetic induction methods, magnetic field resonance methods, electric field resonance methods, microwave methods, etc. A method using a laser or the like may be used. Further, in the present embodiment, wireless power transmission is used for non-contact charging, but wireless power transmission may be performed for purposes other than non-contact charging.

In the WPC standard, the amount of electric power guaranteed when the RX200 receives power from the TX100 is defined by a value called a guaranted power (hereinafter referred to as "GP"). Even if the positional relationship between the RX200 and the TX100 fluctuates and the power transmission efficiency between the power receiving antenna and the power transmission antenna decreases, the GP guarantees the output to the load of the RX200 (for example, a circuit for charging). Indicates the power value. For example, when the GP is 5 watts, even if the positional relationship between the power receiving antenna and the power transmitting antenna fluctuates and the power transmission efficiency drops, the TX100 controls the power transmission so that it can output 5 watts to the load in the RX200. I do.

Further, the WPC standard defines a method for the TX100 to detect the presence of an object (foreign matter) that is not a power receiving device (near the power receiving coil) around the TX100. More specifically, a power loss method for detecting foreign matter by the difference between the transmitted power in TX100 and the received power in RX200 and a Q value measuring method for detecting foreign matter by a change in the quality coefficient (Q value) of the power transmission coil in TX100 are defined. ing. Foreign matter detection by the power loss method is performed during power transmission (Power Transfer phase described later). Further, the foreign matter detection by the Q value measurement method is carried out before the power transmission (Negotiation phase or Negotiation phase described later).

The RX200 and TX100 according to the present embodiment communicate for power transmission / reception control based on the WPC standard. The WPC standard defines a plurality of phases, including a Power Transfer phase in which power transmission is executed and one or more phases before actual power transmission is performed, for power transmission / reception control required in each phase. Communication takes place. The pre-power transmission phase may include a Selection phase, a Ping phase, an Identity and Configuration phase, a Negotiation phase, and a Calibration phase. In the following, the Identity and Configuration phase will be referred to as the I & C phase.

In the Selection phase, the TX100 intermittently transmits Analog Ping to detect that an object is placed on the charging stand of the TX100 (for example, an RX200, a conductor piece, or the like is placed on the charging stand). The TX100 detects at least one of the voltage value and the current value of the power transmission antenna when the Analog Ping is transmitted, and determines that an object exists when the voltage value falls below a certain threshold value or the current value exceeds a certain threshold value. Then, the transition to the Ping phase occurs.

In the Ping phase, the TX100 transmits a Digital Ping that has a larger power than the Analog Ping. The size of the Digital Ping is sufficient power to activate the control unit of the RX200 mounted on the charging stand of the TX100. The RX200 notifies the TX100 of the magnitude of the received voltage. In this way, the TX100 recognizes that the object detected in the Selection phase is the RX200 by receiving the response from the RX200 that has received the Digital Ping. Upon receiving the notification of the received voltage value, the TX100 transitions to the I & C phase.

In the I & C phase, the TX100 identifies the RX200 and acquires device configuration information (capacity information) from the RX200. Therefore, the RX200 transmits the ID Packet and the Configuration Packet to the TX100. The ID Packet includes the identifier information of the RX200, and the Configuration Packet contains the device configuration information (capacity information) of the RX200. The TX100 that has received the ID Packet and the Configuration Packet responds with an acknowledge (ACK, acknowledgment). Then, the I & C phase ends.

In the Negotiation phase, the GP value is determined based on the GP value required by the RX200, the power transmission capacity of the TX100, and the like. Further, the TX100 executes a foreign matter detection process using the Q value measurement method in accordance with the request from the RX200. In addition, the WPC standard stipulates a method of once shifting to the Power Transfer phase and then performing the same processing as the Negotiation phase again at the request of the RX200. The phase that shifts from the Power Transfer phase and performs these processes is called the Renewation phase.

In the calibration phase, the RX200 notifies the TX100 of a predetermined received power value (received power value in the light load state / received power value in the maximum load state) based on the WPC standard, and the TX100 adjusts for efficient power transmission. I do. The received power value notified to the TX100 can be used for the foreign matter detection process by the power loss method.

In the Power Transfer phase, control is performed for starting and continuing power transmission, and stopping power transmission due to an error or full charge. In the Power Transfer phase, control communication based on the WPC standard is started from RX200. When the RX200 transmits some communication packet to the TX100, it waits for a response from the TX100 for a predetermined time, and during that time, the RX200 does not transmit the next communication packet. When the TX100 receives a communication packet from the RX200, the TX100 transmits a response packet to the RX200 before the predetermined time elapses. By arranging the starting point for starting communication and the communication timing in this way, the possibility that the packet transmitted from the TX100 to the RX200 cannot be received on the RX200 side is reduced. In the following, the predetermined time for waiting for a response packet in RX200 and the maximum time for transmitting a response packet in TX100 will be referred to as "T-Resp".

For these power transmission / reception control, the TX100 and RX200 use the same antenna (coil) as the wireless power transmission based on the WPC standard, and perform communication in which a signal is superimposed on the electromagnetic wave transmitted from the antenna. The range in which communication based on the WPC standard is possible between the TX100 and the RX200 is almost the same as the power transmission range of the TX100 (for example, the range shown by the broken line in FIG. 4).

[Device configuration]
Subsequently, the configurations of the power transmission device 100 (TX100) and the power receiving device 200 (RX200) according to the present embodiment will be described. It should be noted that the configuration described below is merely an example, and a part (in some cases, all) of the configurations described below may be replaced or omitted with other configurations that perform similar functions. It may be added to the configuration described. Further, one block shown in the following description may be divided into a plurality of blocks, or the plurality of blocks may be integrated into one block. Further, each functional block shown below is assumed to function as a software program, but a part or all of the functional blocks included in the functional block may be hardwareized.

FIG. 1 is a functional block diagram showing a configuration example of the TX100 according to the present embodiment. The TX 100 includes a control unit 101, a power supply unit 102, a power transmission unit 103, a communication unit 104, a power transmission antenna 105, a temperature detection unit 106, and a memory 107. In FIG. 1, the control unit 101, the power supply unit 102, the power transmission unit 103, the communication unit 104, the temperature detection unit 106, and the memory 107 are described as separate bodies, but any plurality of functional blocks among them are the same chip. It may be implemented within.

The control unit 101 controls the entire TX100 by, for example, executing a control program stored in the memory 107. In addition, the control unit 101 controls power transmission control including communication for device authentication in the TX100. Further, the control unit 101 may perform control for executing an application other than wireless power transmission. The control unit 101 is configured to include one or more processors such as a CPU (Central Processing Unit) or an MPU (MicroProcessor Unit), for example. The control unit 101 may be configured with hardware dedicated to specific processing such as an integrated circuit (ASIC: Application Specific Integrated Circuit) for a specific application. Further, the control unit 101 may be configured to include an array circuit such as an FPGA (Field Programmable Gate Array) compiled to execute a predetermined process. The control unit 101 stores information to be stored in the memory 107 during execution of various processes. Further, the control unit 101 can measure the time using a timer (not shown).

The power supply unit 102 supplies power to each functional block. The power supply unit 102 is, for example, a commercial power supply or a battery. The battery stores the electric power supplied from the commercial power source.

The power transmission unit 103 converts the DC or AC power input from the power supply unit 102 into AC frequency power in the frequency band used for wireless power transmission, and inputs the AC frequency power to the power transmission antenna 105 to receive power to the RX200. Generates an electromagnetic wave to make it. For example, the power transmission unit 103 converts the DC voltage supplied by the power supply unit 102 into an AC voltage by a switching circuit having a half-bridge or full-bridge configuration using a FET (Field Effect Transistor). In this case, the power transmission unit 103 includes a gate driver that controls ON / OFF of the FET.

The power transmission unit 103 controls the intensity of the electromagnetic wave to be output by adjusting the voltage (transmission voltage) and / or current (transmission current) input to the power transmission antenna 105. Increasing the transmission voltage or transmission current increases the intensity of electromagnetic waves, and decreasing the transmission voltage or transmission current decreases the intensity of electromagnetic waves. Further, the power transmission unit 103 controls the output of the AC frequency power so that the power transmission from the power transmission antenna 105 is started or stopped based on the instruction of the control unit 101. Further, it is assumed that the power transmission unit 103 has an ability to supply electric power sufficient to output 15 watts (W) of electric power to the charging unit 206 (FIG. 2) of RX200 corresponding to the WPC standard.

The communication unit 104 communicates with the RX200 for power transmission control based on the WPC standard as described above. The communication unit 104 modulates the electromagnetic wave output from the power transmission antenna 105, transmits information to the RX 200, and performs communication. Further, the communication unit 104 demodulates the electromagnetic wave output from the power transmission antenna 105 and modulated in the RX200 to acquire the information transmitted by the RX200. That is, the communication performed by the communication unit 104 is performed by superimposing the signal on the electromagnetic wave transmitted from the power transmission antenna 105. Further, the communication unit 104 may communicate with the RX200 by communication according to a standard different from the WPC standard using an antenna different from the power transmission antenna 105, or may selectively use a plurality of communications to communicate with the RX200. You may.

The temperature detection unit 106 has a function of detecting the temperature, and is realized by, for example, a thermometer or a thermocouple. The temperature detection unit 106 detects the temperature inside and around the power transmission device that must limit the power transmission of the power transmission unit 103 when the temperature of the place rises. The inside of the power transmission device refers to, for example, one or more of the power transmission unit 103, the communication unit 104, the power transmission antenna 105, and the housing of the power transmission device. The electronic components constituting the power transmission unit 103, the communication unit 104, and the power transmission antenna 105 have an upper limit on the guaranteed operating temperature, and the operation is not guaranteed when the temperature exceeds the upper limit. Therefore, from the viewpoint of safety, it is necessary to limit the power transmission of the power transmission unit 103 when the temperature exceeds the upper limit. Further, since the temperature of the housing may be touched by the user, it is necessary to limit the power transmission as well when the temperature exceeds a predetermined temperature. The ambient temperature is the temperature of the air outside the housing of the power transmission device (hereinafter referred to as the environmental temperature). Since the power transmission device has an upper limit on the guaranteed operating temperature like the parts, it is necessary to limit the power transmission of the power transmission unit 103 when the temperature exceeds the upper limit.

In addition to storing the control program, the memory 107 can also store the states (received power value, etc.) of the TX100 and RX200. For example, the state of the TX100 can be acquired by the control unit 101, the state of the RX200 can be acquired by the control unit 201 (FIG. 2) of the RX200, and can be received via the communication unit 104.

FIG. 2 is a block diagram showing a configuration example of the RX200 according to the present embodiment. The RX200 includes a control unit 201, a UI (user interface) unit 202, a power receiving unit 203, a communication unit 204, a power receiving antenna 205, a charging unit 206, a battery 207, and a memory 208. The plurality of functional blocks shown in FIG. 2 may be realized as one hardware module.

The control unit 201 controls the entire RX 200 by executing a control program stored in the memory 208, for example. That is, the control unit 201 controls each functional unit shown in FIG. Further, the control unit 201 may perform control for executing an application other than wireless power transmission. An example of the control unit 201 is configured to include one or more processors such as a CPU or an MPU. The entire RX200 (if the RX200 is a smartphone, the entire RX200) may be controlled in cooperation with the OS (Operating System) executed by the control unit 201.

Further, the control unit 201 may be configured with hardware dedicated to a specific process such as an ASIC. Further, the control unit 201 may be configured to include an array circuit such as an FPGA compiled to execute a predetermined process. The control unit 201 stores the information to be stored during the execution of various processes in the memory 208. Further, the control unit 201 can measure the time using a timer (not shown).

The UI unit 202 outputs various outputs to the user. The various outputs referred to here are operations such as screen display, LED blinking and color change, audio output by a speaker, and vibration of the RX200 main body. The UI unit 202 is realized by a liquid crystal panel, a speaker, a vibration motor, and the like.

The power receiving unit 203 acquires AC power (AC voltage and AC current) generated by electromagnetic induction generated by electromagnetic waves radiated from the transmission antenna 105 of the TX100 in the power receiving antenna 205. Then, the power receiving unit 203 converts the AC power into direct current or AC power having a predetermined frequency, and outputs the power to the charging unit 206 that performs processing for charging the battery 207. That is, the power receiving unit 203 supplies electric power to the load in the RX200. The above-mentioned GP is an electric energy that is guaranteed to be output from the power receiving unit 203. It is assumed that the power receiving unit 203 has an ability of the charging unit 206 to supply electric power for charging the battery 207 and to supply electric power sufficient to output 15 watts of electric power to the charging unit 206.

The communication unit 204 communicates with the communication unit 104 of the TX100 for power reception control based on the WPC standard as described above. The communication unit 204 demodulates the electromagnetic wave input from the power receiving antenna 205 and acquires the information transmitted from the TX100. Then, the communication unit 204 communicates with the TX 100 by superimposing the signal regarding the information to be transmitted to the TX 100 on the electromagnetic wave by load-modulating the input electromagnetic wave. The communication unit 204 may communicate with the TX100 by a standard different from the WPC standard using an antenna different from the power receiving antenna 205, or may selectively use a plurality of communications to communicate with the TX100. May be good.

In addition to storing the control program, the memory 208 also stores the states of the TX100 and RX200. For example, the state of the RX200 can be acquired by the control unit 201, the state of the TX100 can be acquired by the control unit 101 of the TX100, and can be received via the communication unit 204.

Next, a functional block diagram of the control unit 101 of the TX100 will be described with reference to FIG. The control unit 101 includes a WPC communication processing unit 301, a WPC power transmission processing unit 302, a foreign matter detection processing unit 303, and a calculation processing unit 304. The WPC communication processing unit 301 is a processing unit that performs control communication with the RX200 based on the WPC standard via the communication unit 104. The WPC power transmission processing unit 302 is a processing unit that controls the power transmission unit 103 and controls the power transmission to the RX200. The foreign matter detection processing unit 303 is a processing unit that detects foreign matter by measuring the power transmitted by the power transmission unit 103 and the Q value of the power transmission antenna 105. The foreign matter detection processing unit 303 can realize a foreign matter detection function by a power loss method and a foreign matter detection function by a Q value measurement method. Further, the foreign matter detection processing unit 303 may perform the foreign matter detection processing by using another method. For example, in a TX having an NFC (Near Field Communication) communication function, the foreign matter detection processing unit 303 uses a foreign matter detection function according to the NFC standard. Processing may be performed. The calculation processing unit 304 is a processing unit that calculates a power value that can be output to the RX 200 via the power transmission unit 103. The calculation processing unit 304 monitors the temperature measurement result using the temperature detection unit 106, the power supply state in the power supply unit 102, and the like, and based on this, continues the power value (GP) that can guarantee the supply to the RX200. Calculate. The WPC power transmission processing unit 302 receives the calculation result in the calculation processing unit 304 and controls the power transmission to the RX 200. The functions of the WPC communication processing unit 301, the WPC power transmission processing unit 302, the foreign matter detection processing unit 303, and the calculation processing unit 304 are realized as programs that operate in the control unit 101. Each processing unit is configured as an independent program, and can operate in parallel while synchronizing the programs by event processing or the like.

[Flowchart of power transmission device]
Next, the operation of the TX100 of the present embodiment will be described with reference to the flowcharts of FIGS. 5A to 5D.

FIG. 5A is a flowchart showing the processing operation of each processing unit operated by the control unit 101. This process is continuously and repeatedly executed while the TX100 is running. When the TX100 is started, after performing the processing of the Selection phase, the Ping phase, and the I & C phase already described (S501), the GP value is negotiated with the RX200 and determined in the Negotiation phase (S502). Specifically, first, the WPC communication processing unit 301 receives the Special Request Packet from the RX200, and acquires the GP value requested by the RX200. Next, the calculation processing unit 304 calculates the value of GP that can be guaranteed as TX100, and if the GP notified from RX200 can be guaranteed, ACK Packet (affirmative response), if not, NAK Packet (negative response), WPC. The communication processing unit 301 transmits to the RX200. The value of GP agreed with RX200 by returning ACK Packet here is hereinafter referred to as GP _CON . Subsequently, the TX100 transitions to the Power Transfer phase (S504) after performing the calibration phase processing (S503), and then starts the power transmission processing for the RX200.

When the WPC communication processing unit 301 receives the End Power Transfer Packet (hereinafter referred to as “EPT packet”) from the RX200 (Yes in S505), the WPC power transmission processing unit 302 immediately stops the power transmission processing for the RX200 (S506). Even during the processing shown in S507 and later, the TX100 stops the power transmission processing when it receives the EPT packet from the RX200, transitions to the Selection phase, and executes the processing again from S501.

During the Power Transfer phase, the calculation processing unit 304 periodically executes the GP calculation process, and calculates the value of the GP that can be guaranteed for the RX200 at the timing of executing the calculation process (S507). The GP value calculated here is hereinafter referred to as GP _CUR .

When the WPC communication processing unit 301 receives a specific request packet from the RX200 (YES in S508), the TX100 determines whether it is necessary to request some processing from the RX200 (S509 to S511). In the present embodiment, the specific request packet is a 24-bit Received Power Packet (hereinafter referred to as “RP packet”), but a packet other than the RP packet may be used.

When the calculation processing unit 304 determines that the GP _CUR calculated in S507 is 0 or a value small enough to determine that appropriate power transmission processing cannot be performed (Yes in S509), the TX100 executes power transmission stop processing in the RX200. (S512). Further, when the foreign matter detection processing unit 303 is suspected of placing a foreign matter (Yes in S510), the TX100 requests the RX200 to request the TX100 to perform the foreign matter detection processing (S513). Specifically, when the foreign matter detection processing unit 303 determines that a foreign matter is detected by the foreign matter detection process by the power loss method as the first foreign matter detection method, the Q value measurement method as the second foreign matter detection method for the RX200. It is requested that the TX100 be requested to carry out the foreign matter detection process by the above. Further, when the GP _CUR calculated in S507 is different from the GP _CON (Yes in S511), the TX100 requests the RX200 to carry out a process for renegotiating and determining the GP value (S514). If neither is the case (No in S509 to S511), the WPC communication processing unit 301 transmits an ACK response to the RX200 (S515). The processing of S512 to S514 will be described in detail later with reference to FIGS. 5B to 5D.

When the WPC communication processing unit 301 receives the Renegotiate Packet (hereinafter referred to as “RN packet”) from the RX200 (Yes in S516), the TX100 transitions to the Renegotiation phase (S517). In the renegotiation phase, the TX100 executes processing such as determination of the GP value, detection of foreign matter, and notification of the set value according to the request packet transmitted from the RX200. If the various processes in the Renegotiation phase are successful (Yes in S518), the TX100 continues the power transmission process. When various processes in the Renegotiation phase fail (No in S518), the TX100 stops the power transmission process for the RX200 (S519).

FIG. 5B is a flowchart detailing the processing procedure (S512) in which the TX100 requests the execution of the power transmission stop processing. First, the TX100 determines whether or not the RX200 can interpret the request packet requesting the stop of power transmission to be transmitted (S520). This is performed by the WPC communication processing unit 301 confirming the version information included in the Identity packet received from the RX200 in the I & C phase (S501). For example, the TX100 determines that the RX200, which has transmitted a version after a specific version, can interpret the request packet. When the TX100 determines that the RX200 cannot interpret the request packet (No in S520), the WPC communication processing unit 301 stops the power transmission processing by the WPC power transmission processing unit 302 without transmitting the request packet to the RX200 (S524). In this way, by preventing the request packet from being transmitted to the RX200 that cannot interpret the request packet, the possibility of causing an unexpected operation of the RX200 is reduced. The method of determining whether the RX200 can interpret the request packet is not limited to the method of referring to the version information of the Identity packet. For example, a method may be used in which the RX200, which has transmitted the additionally specified packet after the requested packet is specified as the communication specification, determines that the requested packet is interpreted. When the TX100 determines that the RX200 can interpret the request packet (Yes in S520), the WPC communication processing unit 301 transmits a request packet requesting the RX200 to transmit the EPT packet (S521). The request packet is transmitted by the WPC power transmission processing unit 302 within the P-Resp time from the reception of the RP packet as a response packet to the RP packet received in S508.

The data structure of the request packet transmitted by the TX100 to the RX200 is shown in FIG. The request packet is composed of information elements of response type 710, request type 720, request reason 730, and request parameter 740. The response type 710 is an 8-bit data area common to the response packet, and in the case of the request packet, a value of 10101010b (0xAA) is specified. The request type 720, the request reason 730, and the request parameter 740 are a total of 16-bit data areas in which the response type 710 is additionally included in the response packet of 0xAA (RQ). The request type 720 is a 4-bit data area representing the type of processing (identification information that identifies the processing) that the TX100 requests from the RX200. The types specified by the request type 720 are three types: an EPT transmission request (0x0), a GP renegotiation request (0x1), and a foreign matter detection implementation request (0x2). The request reason 730 is a 4-bit data area indicating the reason why the TX100 requests the process specified by the request type 720, and a meaningful value is assigned to each request type 720. For example, when the request type 720 is an EPT transmission request, a reason for requesting EPT packet transmission in order to detect a foreign object is assigned to 0x2 of the value of the request reason 730. When the request type 720 is a GP renegotiation request (0x1), the reason that the GP renegotiation is requested due to the temperature rise is assigned to 0x2 of the value of the request reason 730. The value 0x1 (no reason) of the request reason 730 may be associated with any operation by the user. The request parameter 740 is an additional parameter associated with the request content of the request type 720. When the request type 720 is an EPT transmission request, the value of the End Power Transfer Code specified in the requested EPT packet is specified in the request parameter 740. When the request type 720 is a GP renegotiation request, the value of GP that the TX100 wants to specify in the GP renegotiation is specified in units of 0.5 watts. For example, if the TX100 wants the GP to be 15 watts, specify 0x1E in the requirement parameter 740. When the request type 720 is a foreign matter detection request, the type of foreign matter detection processing to be executed is specified in the request parameter 740. The types of foreign matter detection processing defined here are foreign matter detection processing (0x01) by the Q value measurement method and NFC tag detection processing (0x02) using the NFC function. The data structure of the request packet shown in FIG. 7 shows an example in this embodiment, and the size, order, value assignment, and the like of each information element are not limited to this. Further, the request packet may include other information elements in addition to the four information elements shown in FIG. 7, or may not include any of the four information elements.

In the process of S521, the WPC communication processing unit 301 transmits a request packet for which an EPT transmission request (0x0) is specified for the request type 720 to the RX200. At that time, the WPC communication processing unit 301 specifies the values of the request reason 730 and the request parameter 740 according to the reason for making the EPT transmission request. When the reason is that the temperature rise is detected by the temperature detection unit 106, the TX100 specifies the temperature rise (0x3) as the request reason 730 and the Start (0x0B) as the requirement parameter 740, and when the temperature drops, the power transmission process is performed. Suggests to RX200 to resume. On the other hand, when the reason is the power reduction in the power supply unit 102, the TX100 specifies the International Fault (0x02) in the request parameter 740, suggesting to the RX200 that the power transmission process ends with an error and is not automatically restarted. To do. After transmitting the request packet, the TX100 waits for an EPT packet reception from the RX200 for a certain period of time. When the EPT packet is received (Yes in S522) or a certain time elapses without receiving the EPT packet (Yes in S523), the WPC power transmission processing unit 302 stops the power transmission processing for the RX200 (S524).

As described above, when the power transmission process is stopped due to the TX100, by notifying the RX200 of the reason, it is possible to branch the subsequent process in the RX200, and in particular, the content of the status / error notification to the user. Convenience can be improved by refining the details. For example, the RX200 can notify the user of the reason why the charging process has stopped by showing the user the reason notified by the request reason 730 in the UI unit 202, which improves convenience. Further, when the request parameter 740 is Start, the charging process is restarted / continued without notifying the user by not indicating to the user that the charging process is continuously interrupted. Can be done.

FIG. 5C is a flowchart detailing the processing procedure (S513) in which the TX100 requests the execution of the foreign matter detection process. First, the TX100 determines whether or not the RX200 can interpret the request packet requesting the execution of the foreign matter detection process to be transmitted, similar to the process of the power transmission stop request shown in FIG. 5B (S530). When the TX100 determines that the RX200 cannot interpret the request packet (No in S530), the WPC communication processing unit 301 stops the power transmission processing by the WPC power transmission processing unit 302 without transmitting the request packet to the RX200 (S531). When the TX100 determines that the RX200 can interpret the request packet (Yes in S530), the WPC communication processing unit 301 transmits a request packet requesting the RX200 to execute the foreign matter detection process by the Q value measurement method. (S532). By this process, the TX100 requests the RX200 to transmit an RN packet instructing the transition to the Renewation phase and a FOD Status Packet instructing the execution of foreign matter detection to the TX100. FOD is an abbreviation for Foreign Object Detection. The request packet is transmitted by the WPC power transmission processing unit 302 within the P-Resp time from the reception of the RP packet as a response packet to the RP packet received in S508. Further, the request packet has the data structure shown in FIG. 7, and the request type 720 is set to the foreign matter detection execution request (0x2), and the request parameter 740 is set to the Q value measurement (0x01) as the type of detection processing.

After transmitting the request packet, the TX100 waits for the reception of the RN packet from the RX200 for a certain period of time (S533). When a certain period of time elapses without receiving the RN packet (Yes in S534), the WPC power transmission processing unit 302 stops the power transmission processing for the RX200 (S537). When the RN packet is received (Yes in S533), the TX100 shifts to the Regency phase. After the WPC power transmission processing unit 302 temporarily stops the power transmission processing for the RX200, the WPC communication processing unit 301 waits for the reception of the FOD Status Packet instructing the execution of foreign matter detection (S535). Upon receiving the packet, the foreign matter detection processing unit 303 performs foreign matter detection processing by the Q value measurement method. When a foreign matter is detected as a result of the foreign matter detection process (Yes in S536), the WPC power transmission processing unit 302 stops the power transmission process for the RX200 (S537). If no foreign matter is detected as a result of the foreign matter detection process (No in S536), the foreign matter detection processing unit 303 remeasures the reference value used in the foreign matter detection process by the power loss method (S538). Specifically, the power received by the RX200 in the light load state and the power received by the RX200 in the maximum load state are each acquired from the RX200, and the power loss rate in each load state is calculated. After that, the WPC power transmission processing unit 302 restarts the power transmission processing for the RX200.

By requesting the TX100 to RX200 to carry out the foreign matter detection process in the TX100 as described above, the foreign matter detection process can be performed by a plurality of methods even after the start of the power transmission process, and the accuracy of the foreign matter detection can be expected to be improved. .. For example, if it is determined that the foreign matter detection processing unit 303 has detected a foreign matter by the power loss method due to a displacement of the RX200 during the Power Transfer phase, a foreign matter detection process by measuring the Q value is performed again to perform erroneous detection. Is more likely to be avoided.

FIG. 5D is a flowchart detailing the processing procedure (S514) in which the TX100 requests the RX200 to renegotiate the GP. When requesting renegotiation of GP, the process branches depending on whether to negotiate to increase or decrease GP from the previously agreed value of GP _CON (S540). When renegotiating to reduce GP (Yes in S540), the TX100 first sends a request packet requesting GP renegotiation, which is to be transmitted, in the same manner as the processing of the power transmission stop request shown in FIG. 5B. It is determined whether or not it can be interpreted (S541). When the TX100 determines that the RX200 can interpret the request packet (Yes in S541), the WPC communication processing unit 301 transmits a request packet requesting the RX200 to transmit the GP renegotiation (S542). By this process, the TX100 requests the RX200 to transmit an RN packet instructing the RX200 to shift to the Regency phase and a Special Request Packet (hereinafter referred to as “SRQ / gp packet”) that specifies the GP to the TX100. The request packet is transmitted by the WPC power transmission processing unit 302 within the P-Resp time from the reception of the RP packet as a response packet to the RP packet received in S508. Further, the request packet has the data structure shown in FIG. 7, and the request type 720 is a GP renegotiation request (0x1), and the request parameter 740 is a GP value that the TX100 wants to specify. Further, when the TX100 determines that the RX200 cannot interpret the request packet (No in S541), the WPC communication processing unit 301 transmits a NAK response packet to the RX200 (S543).

After that, the TX100 waits for a certain period of time to receive the RN packet from the RX200 (S544). When a certain period of time elapses without receiving the RN packet (Yes in S547), the WPC power transmission processing unit 302 stops the power transmission processing for the RX200 (S548). When the RN packet is received (Yes in S544), the TX100 shifts to the Regency phase. After the WPC power transmission processing unit 302 temporarily stops the power transmission processing for the RX200, the WPC communication processing unit 301 waits for the reception of the SRQ / gp packet requesting the negotiation of GP (S545). If the GP value specified in the SRQ / gp packet is an acceptable value (Yes in S546), the TX100 updates the GP _CON with the specified GP value and then restarts the power transmission process. If the GP value specified in the SRQ / gp packet is not accepted (No in S546), the WPC power transmission processing unit 302 stops the power transmission processing for the RX200 (S548).

Even when renegotiating to increase GP (No in S540), TX100 determines whether RX200 can interpret the request packet requesting GP renegotiation to be transmitted (S549). When the TX100 determines that the RX200 can interpret the request packet (Yes in S549), the WPC communication processing unit 301 transmits a request packet requesting the RX200 to transmit the GP renegotiation as in the processing of S542. (S550). Further, when the TX100 determines that the RX200 cannot interpret the request packet (No in S549), the WPC communication processing unit 301 transmits an ACK response packet to the RX200 (S551). When renegotiating to increase the GP, the TX100 does not request the power transmission stop processing even if the RN packet cannot be received from the RX200, and continues the power transmission processing without changing the existing GP. When the RN packet is transmitted from the RX200, the TX100 carries out the above-mentioned S516 to S519 (FIG. 5A).

As described above, by requesting the TX100 to RX200 to carry out GP renegotiation, it is possible to quickly change the GP in response to changes in the environment measured by the TX100 (eg, temperature rise / fall). , Improvement of power transmission efficiency is expected. Further, by notifying the RX200 of the GP value that can be guaranteed by the TX100 as a response of the RP packet, it becomes possible to determine whether or not the GP can be renegotiated in the RX200 from the GP value that can be actually agreed upon. As a result, it is possible to reduce the occurrence of GP negotiation processing that cannot be finally agreed upon in the Renegotiation phase.

[Flowchart of power receiving device]
Next, the operation of the charging process in the RX200 of the present embodiment will be described with reference to the flowchart of FIG. FIG. 6 is a flowchart showing the processing executed by the RX200. This process is set to execute the charging function by the WPC in the RX200, and can be repeatedly executed while the charging capacity of the battery 207 is not full.

The RX200 negotiates and determines the GP value with the TX100 in the Negotiation phase after performing the processes of the Selection phase, the Ping phase, and the I & C phase already described (S601). Subsequently, the RX200 transitions to the Power Transfer phase (S604) after performing the calibration phase processing (S603), displays a message to the effect that charging is being performed on the UI unit 202, and starts the charging processing for the battery 207. .. The RX200 periodically transmits an RP packet to the TX100 while receiving power from the TX100 until the charging of the battery 207 is completed (No in S605) (S608). The RX200 notifies the TX100 of the received power in the RX200 with an RP packet, and waits for a P-Resp time to receive a response packet transmitted from the TX100 (S609). When the response packet received from the TX100 is an ACK response (Yes in S610), the RX200 continues the charging process without performing any additional processing. When the response packet received from the TX100 is a NAK response (Yes in S611), the RX200 reduces the power value acquired from the TX100 (S612) and continues the charging process.

When the response packet received from the TX100 is the request packet shown in FIG. 7, the process branches according to the value of the request type 720 of the request packet (S613). When the request type is an EPT transmission request (EPT in S613), the RX200 displays a message corresponding to the value of the request reason 730 of the request packet in the UI unit 202 (S614). For example, when the request reason 730 is foreign matter detection (0x2), a message prompting the removal of foreign matter such as "Please remove anything other than this unit from the charging stand" is displayed. If the reason for request 730 is a temperature rise (0x3), a message such as "Charging will be stopped due to the temperature rise" is displayed. By presenting the reason for stopping charging to the user in this way, it becomes possible for the user to determine what should be done in order to start charging again, and the convenience of the user is improved. Subsequently, the RX200 stops charging the battery 207 (S615) and transmits an EPT packet to the TX100 (S616). At this time, a value specified by the request parameter 740 of the request packet received from the TX100 is set in the End Power Transfer Code of the EPT packet and transmitted. When the End Power Transfer Code of the EPT packet transmitted in S616 is Start (0x0B) (Yes in S617), the RX200 returns to the Selection phase and re-executes the process of FIG. 6 from the beginning (S601). When the End Power Transfer Code is other than Start (No in S617), the RX200 stops the charging process, and then does not perform the charging process until the user performs an operation to start charging again.

When the request type received in S613 is a foreign matter detection request (0x2) (FOD in S613), the RX200 stops charging the battery 207 (S618), transmits an RN packet to the TX100 (S619), and shifts to the regeneration phase. To do. Subsequently, the RX200 transmits a FOD Status Packet to the TX100 (S620), and requests the TX100 to execute a foreign matter detection process by the Q value measurement method. When a NAK response is received from the TX100 as a response to the FOD Status Packet (Yes in S621), the RX200 determines that the TX100 has detected a foreign substance by the Q value measuring method. In this case, the RX200 displays a message prompting the removal of the foreign matter on the UI unit 202 (S614), and transmits an EPT packet to the TX100 (S616). In the End Power Transfer Code of the EPT packet, a reason code indicating that the charging process is stopped due to the detection of foreign matter is specified. When an ACK response is received from the TX100 as a response to the FOD Status Packet (No in S621), the RX200 continues the process assuming that no foreign matter has been detected. The RX200 shifts to the Calibration phase (S622), and notifies the TX100 of the received power value in the light load state and the received power value in the maximum load state. After that, the RX200 shifts to the Power Transfer phase and restarts the charging process for the battery 207 (S623).

When the request type received in S613 is a GP renegotiation request (0x1) (GP in S613), the RX200 stops charging the battery 207 (S624), transmits an RN packet to the TX100 (S625), and enters the regeneration phase. Transition. Subsequently, the RX200 transmits an SRQ / gp packet to the TX100 (S626), and notifies the TX100 of the value of the GP to be changed. The GP value notified here is a value specified by the request parameter 740 of the request packet received in S613. When an ACK response is received as a response to the SRQ / gp packet (Yes in S627), the RX200 determines that the GP renegotiation was successful, shifts to the Power Transfer phase, and restarts the charging process for the battery 207 (S628). .. At this time, the RX200 changes the display of the charging state in the UI unit 202 (S629).

When the GP renegotiation request received in S613 is a request to suppress GP, a message corresponding to the request reason 730 of the packet is displayed in the UI unit 202. For example, when the request reason 730 is a temperature rise (0x2), a message such as "Charging at low speed due to the temperature rise of the charger" is displayed, and the charging speed (transmitted power) is temporarily limited to the user. Notify that you are. Further, when the GP renegotiation request received in S613 is a request to release the suppression of GP (the reason for the request is failure state recovery (0x3)), the charging speed displayed on the UI unit 202 of the RX200 is limited. Delete the message to that effect. In this way, when the power transmitted from the TX100 is suppressed, the UI unit 202 notifies the user of it, so that the user knows the status of the charging process even if the TX100 is a device that does not have the UI function. Can be done. In addition, by displaying the reason why the power transmission from the TX100 is suppressed, the user identifies the cause of the suppression of the power transmission and takes an action to eliminate the cause (eg, cool the TX100). It becomes possible. When a NAK response is received as a response to the SRQ / gp packet (No in S627), the RX200 determines that the GP renegotiation has failed. The RX200 displays a message indicating that the charging process has ended with an error in the UI unit 202 (S614), and transmits an EPT packet to the TX100 (S616). Unknown (0x00) is specified for the End Power Transfer Code of the EPT packet.

If the request type received in S613 is other than the above, or if the response packet to the RP packet transmitted in S608 is not received (other in S613), the RX200 is charged without any additional processing. Continue processing.

[Sequence of wireless power transmission system]
Subsequently, with reference to FIG. 8, a sequence of a wireless power transmission system including TX100 and RX200 will be described. FIG. 8 shows an example of a communication sequence between the TX100 and the RX200 when the RX200 is mounted on the TX100 after the RX200 is set to execute the charging function by the WPC.

First, the TX100 and RX200 perform processing from the Selection phase to the I & C phase (S801) in accordance with the WPC standard, and shift to the Negotiation phase. In the Negotiation phase, GP negotiations will be conducted between TX100 and RX200, and the decision will be made at 15W here (S802). After that, it shifts to the Power Transfer phase through the Calibration phase (S803), and the RX200 acquires power from the TX100 with a maximum received power of 15 W (S804). The RX200 periodically transmits an RP packet to the TX100 (S805), and notifies the TX100 of the value of the power received by the RX200. Upon receiving this, the TX100 transmits an ACK response to the RX200 (S806). Further, the RX200 displays a message indicating that the UI unit 202 is being charged with a high load of 15 W (S807).

After that, the temperature detection unit 106 of the TX100 detects that the temperature has risen above a certain threshold value (S808). Then, the calculation processing unit 304 determines the value of GP that can be guaranteed at the current temperature, and the WPC communication processing unit 301 returns a GP renegotiation request packet to the next received RP packet (S809) (S810). The TX100 sets the reason for requesting GP renegotiation (temperature rise) and the GP value determined by the calculation processing unit 304 as the requested value and transmits the request packet. Here, the desired GP value is 5 W. When the RX200 receives the request packet (S810), it transmits an RN packet to the TX100 (S811) and requests the transition to the renegotiation phase. The TX100 returns an ACK response to this (S812). Subsequently, the RX200 specifies the GP value (5W) received in S810 as the GP value requested for the SRQ / gp packet, and transmits the GP value to the TX100 (S813). The TX100 returns an ACK response to this (S814) and accepts the GP change. In response to this, the RX200 limits the maximum received power to 5W and acquires power from the TX100 (S815). At this time, the RX200 displays a message on the UI unit 202 indicating that the charging process is restricted (S816).

After that, the temperature detection unit 106 of the TX100 detects that the temperature has dropped below a certain threshold value (S817). The calculation processing unit 304 again determines the GP value that can be guaranteed at the current temperature, and the WPC communication processing unit 301 returns a GP renegotiation request packet for the next received RP packet (S818) (S819). The TX100 sets the reason for requesting GP renegotiation (recovery of defective state) and the GP value determined by the calculation processing unit 304 as the requested value and transmits the request packet. Here, the desired GP value is 15 W. When the RX200 receives the request packet (S819), it transmits an RN packet to the TX100 (S820) and requests the transition to the Renewation phase. The TX100 returns an ACK response to this (S821). Subsequently, the RX200 specifies the GP value (15W) received in S819 as the GP value requested for the SRQ / gp packet, and transmits the GP value to the TX100 (S822). The TX100 returns an ACK response to this (S823) and accepts the GP change. In response to this, the RX200 acquires power from the TX100 with a maximum received power of 15 W (S824). Further, the RX200 displays a message indicating that the UI unit 202 is being charged with a high load of 15 W (S825).

As described above, according to the present embodiment, the TX100 can promptly and surely request the RX200 to perform the next processing to be performed during the power transmission processing (during the Power Transfer phase).

In the above embodiment, a method of requesting TX100 to RX200 to carry out GP renegotiation is shown. Further, with reference to FIG. 8, a method of limiting / releasing the GP according to the temperature rise / fall in the TX100 is shown. By adopting such a configuration, it is possible to quickly change the power transmission output to the RX200 according to the change in the environment detected by the TX100, and it is expected that the power transmission efficiency will be improved. More specifically, when it becomes impossible to transmit power at high output due to temperature rise, etc., it becomes possible to suppress the power transmission to an output that can be transmitted quickly, and power transmission can be performed without completely stopping power transmission. You will be able to continue. In addition, when it is no longer necessary to suppress the temperature drop transmission output, the transmission output can be increased quickly.

Further, in the above-described embodiment, a method of requesting the TX100 to the RX200 to stop the power transmission process is shown. In addition, a method of notifying the RX200 of the reason why the TX100 wants to stop the power transmission process is also shown. By adopting such a configuration, the RX200 can know in detail the reason why the power transmission from the TX100 is stopped, and it is possible to finely branch the processing after the power transmission processing is stopped in the RX200. Become. In the above-described embodiment, by switching the message displayed on the UI unit 202 according to the reason for stopping, it is possible to suggest the operation to be performed in order for the user to start charging again, which is expected to improve the convenience of the user. it can.

Further, in the above-described embodiment, a method of requesting the TX100 to the RX200 to perform the foreign matter detection process is shown. This makes it possible to perform foreign matter detection processing by a plurality of methods, and is expected to improve the accuracy of foreign matter detection. For example, power loss occurs due to the movement of the RX200 during the Power Transfer phase, and after it is determined that a foreign substance has been placed, it is possible to avoid erroneous detection by detecting the foreign substance using the Q value measurement method. There is a possibility like.

The above is an example of a typical embodiment, but the present embodiment is not limited to the embodiment shown in the specification and drawings, and may be appropriately modified and implemented without changing the gist thereof. Good.

In the present embodiment, as the processes requested from the TX100 to the RX200, three are largely exemplified, the transmission of the EPT, the implementation of the foreign matter detection process, and the GP renegotiation, but the present invention is not limited thereto. For example, you may request renegotiation of non-GP parameter values agreed between TX100 and RX200. For example, renegotiation may be requested regarding the resolution and notification interval of the received power value notified by the RX 200 to the TX 100, the FSK (Frequency Shift Keying) polarity and the degree of modulation, the time interval from the EPT transmission to the next Digital Ping transmission, and the like. .. Further, when requesting the execution of the foreign matter detection process, the foreign matter detection process by a method other than the Q value measurement may be requested. For example, the RX200 may be requested to perform an NFC tag detection process using the NFC function, or the RX200 may be requested to transmit an EPT or suppress the received power in order to execute the NFC tag detection process on the TX100.

Further, in the present embodiment, as a method of making a request from the TX100 to the RX200, an example of using a response packet for an RP packet transmitted from the RX200 to the TX100 has been described, but the present invention is not limited to this. For example, the request content may be notified by using a Control Error Packet transmitted from the RX200 or a response packet for other packets.

Further, in the present embodiment, as a method of notifying the request from the TX100 to the RX200, an example of using one communication packet represented by a series of data strings has been described, but the present invention is not limited to this. After receiving some packet from the RX200, the TX100 may notify the RX200 that it will make a request to the RX200 within a predetermined time. For example, the content of the request may be divided into a plurality of communication packets. May be sent. For example, the TX100, as a pair with the received RP packet, transmits a first response packet indicating only that there is some request to the RX200 within a predetermined time, and then a second response packet indicating the details of the request to be transmitted. May be requested from the RX200 to receive. Similarly, the TX100 may request the RX200 to send the first response packet to the RX200 and send a request packet to the TX100 to acquire the content of the request to the RX200. By dividing the request from the TX100 to the RX200 into a plurality of packets in this way, it is possible to reduce the size of the packet to be transmitted first, which improves communication efficiency, simplifies the reception process in the RX200, and reduces the reception waiting time. The effect of minimization can be expected.

Further, in the present embodiment, as a method of notifying the request from the TX100 to the RX200, an example in which one request is made by one communication packet has been described, but the present invention is not limited to this. The TX100 may specify a plurality of requests in one communication packet and transmit it to the RX200.

Further, in the present embodiment, when the RX200 receives a request from the TX100, the process corresponding to the request is always executed, but the present invention is not limited to this. The RX200 may determine whether to execute the requested processing according to its own device and the surrounding environment. Taking FIG. 6 as an example, when the RX200 receives a request for GP renegotiation from the TX100, it always transitions to the Renegotiation phase and executes the GP renegotiation process. However, for example, when the state of charge of the battery 207 is nearing completion and the request is a request for increasing GP, the request packet transmitted from the TX100 may be ignored. By doing so, there is a possibility that a decrease in charging efficiency due to generation of unnecessary packet transmission / reception just before the completion of charging can be avoided. Further, the TX100 may transmit the request packet transmitted to the RX200 by adding information indicating whether or not the execution of the request is essential for the continuation of the subsequent processing.

Further, in the present embodiment, the same T-Resp value is used for each of the TX100 and RX200, but the present invention is not limited to this. For T-Resp, the value used in TX100 may be smaller than that of RX200 in consideration of processing delay and the like. Further, T-Resp may use different values depending on the above-mentioned phase, packet type, WPC standard version to be used, surrounding environment, and the like.

Further, in the present embodiment, a predetermined message is displayed (presented) on the UI unit 202 of the RX200, but the TX100 is also provided with a UI unit having the same configuration to display (present) a necessary message related to the request message. It may be configured to (present).

The power transmission method used in carrying out the present invention is not particularly limited. A magnetic field resonance method may be used in which power is transmitted by coupling of a magnetic field resonance (resonance) between the resonator (resonant element) of the power transmitting device and the resonator (resonant element) of the power receiving device. Further, a power transmission method using an electromagnetic induction method, an electric field resonance method, a microwave method, a laser or the like may be used.

Further, the power transmitting device and the power receiving device may be, for example, an image input device such as an image pickup device (camera, video camera, etc.) or a scanner, or an image output device such as a printer, a copier, or a projector. Further, it may be a storage device such as a hard disk device or a memory device, or an information processing device such as a personal computer (PC) or a smartphone.

Further, the flow chart shown in FIGS. 5A to D is started when the power is turned on to the control unit of the power transmission device. Each process of the flowchart shown in FIGS. 5D to 5D can be realized by the control unit executing a program stored in the memory of the power transmission device. Further, each process of the flowchart shown in FIG. 6 can be realized by the control unit executing the program stored in the memory of the power receiving device.

Further, at least a part of the processing of the flowchart shown in the flow charts of FIGS. 5A to 5D and 6 may be realized by hardware. When it is realized by hardware, for example, by using a predetermined compiler, a dedicated circuit may be automatically generated on the FPGA from the program for realizing each step. Further, a Gate Array circuit may be formed in the same manner as the FPGA and realized as hardware.

The present invention supplies a program that realizes one or more functions of the above-described embodiment to a system or device via a network or storage medium, and one or more processors in the computer of the system or device reads and executes the program. It can also be realized by the processing to be performed. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

The invention is not limited to the above embodiments, and various modifications and modifications can be made without departing from the spirit and scope of the invention. Therefore, a claim is attached to make the scope of the invention public.

100 power transmission device, 101 control unit, 102 power supply unit, 103 power transmission unit, 104 communication unit, 105 power transmission antenna, 106 temperature detection unit, 107 memory, 200 power receiving device, 201 control unit, 202 UI unit, 203 power receiving unit, 204 communication Unit, 205 Power receiving antenna, 206 Charging unit, 207 Battery, 208 Memory

Claims (15)

It ’s a power transmission device,
A power transmission means that wirelessly transmits power to a power receiving device,
A receiving means that receives a first signal from the power receiving device while power transmission is being performed by the power transmitting means, and
It has a transmitting means for transmitting a second signal to the power receiving device in response to the first signal received by the receiving means.
The second signal is a power transmission device that includes identification information that identifies one or more processes requested of the power receiving device. The power transmission device according to claim 1, wherein the transmission means transmits the second signal before a predetermined time elapses after the first signal is received by the reception means. The power transmission device according to claim 2, wherein the transmission means also transmits a third signal different from the second signal before the predetermined time elapses. The first signal is a 24-bit Received Power Packet based on the Wireless Power Consortium (WPC) standard.
The power transmission device according to claim 3, wherein the third signal is a signal indicating an acknowledgment (ACK) or a negative response (NAK). The power transmission device according to any one of claims 1 to 4, wherein the transmission means divides the second signal into a plurality of packets and transmits the second signal. The power transmission device according to any one of claims 1 to 5, wherein the second signal includes information indicating a reason for each of the one or more processes. The power transmission device according to any one of claims 1 to 6, wherein the one or more processes include a process for the power receiving device to stop power transmission to the power transmission device. The one or more processes include a process for the power receiving device to negotiate with the power transmitting device to change a power value that can be guaranteed to be supplied to the power receiving device. Item 2. The power transmission device according to any one of Items 1 to 7. A determination means for determining a power value that can be guaranteed to be supplied to the power receiving device as a first power value with the power receiving device before the power transmission by the power transmitting means is started.
A calculation means that continuously calculates a power value that can be guaranteed to be supplied to the power receiving device as a second power value after the power transmission by the power transmission means is started.
The power transmission device according to claim 7 or 8, further comprising. Further having a calculation means for continuously calculating the power value that can be guaranteed to be supplied to the power receiving device as the second power value after the power transmission by the power transmission means is started.
If, after the first signal is received by the receiving means, the calculating means determines that the second power value is small enough to determine that the power transmission process cannot be performed by the power transmission means, the transmission The power transmission device according to claim 9, wherein the power receiving device includes the identification information identifying the process for stopping the power transmission to the power transmission device in the second signal and transmits the means. When the first power value and the second power value are different after the first signal is received by the receiving means, the power receiving device supplies the power receiving device to the power receiving device. The ninth or tenth aspect of the present invention, wherein the second signal includes identification information that identifies a process for performing negotiations with the power transmission device for changing a guaranteed power value. Power transmission equipment. The one or more processes include a process for causing the power receiving device to perform a foreign substance detection process for detecting the presence of a foreign substance in the vicinity of the power transmission device. Item 2. The power transmission device according to any one of Items 1 to 11. Further having a detection means capable of performing the foreign matter detection process by the first method and the second method,
When a foreign substance is detected by the detection means by the first method, the transmission means identifies a process for causing the power receiving device to perform the foreign substance detection process by the second method. The power transmission device according to claim 12, wherein the identification information to be used is included in the second signal and transmitted. It is a control method of a power transmission device having a power transmission means that wirelessly transmits power to the power receiving device.
A receiving step of receiving a first signal from the power receiving device while power transmission is being performed by the power transmitting means,
It has a transmission step of transmitting a second signal to the power receiving device in response to the received first signal.
A method for controlling a power transmission device, wherein the second signal includes identification information that identifies one or more processes requested from the power receiving device. A program that causes a computer to function as each means of the power transmission device according to any one of claims 1 to 13.

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