Power transmitting device, power receiving device, method performed by power transmitting device, method performed by power receiving device, and program

Abstract

The power transmitting device and the power receiving device negotiate, wirelessly transmit power to the power receiving device based on a result of the negotiation, and perform a process including detection of a near field communication (NFC) tag (F709 to F724). The power transmitting device transmits information related to NFC tag detection to the power receiving device at least in the negotiation, wherein the NFC tag detection is performed during power transmission.

Description

Technical Field

[0001] This disclosure relates to technologies for wireless power transmission. Background Technology

[0002] Recently, the development of wireless power transmission systems has been extensive. Typically, the technology of wireless power transmission systems is based on standards developed by the Wireless Power Consortium (WPC), a standardization organization, for wireless charging (WPC standards).

[0003] On the other hand, the NFC standard is known as a standard for short-range wireless communication. NFC is an abbreviation for Near Field Communication. In the NFC standard, the transmission of messages used to detect a device to be used as a communication partner by sending and modulating carrier waves is called polling. Polling is performed by a device with functions such as an NFC standard reader / writer. A device that functions as follows is called an NFC tag: receiving polls from the reader / writer, applying load modulation to the carrier waves sent from the reader / writer, and responding to the polls.

[0004] Power supply devices, including those based on WPC and NFC standards, can detect NFC tags at various steps of the WPC standard. The power supply device can perform NFC tag detection processing while periodically polling during the negotiation step or the power supply step to the receiving device.

[0005] Patent Document 1 discloses a technology that enables a power supply device with NFC tag detection functionality to send information indicating the result (detection status) of the NFC tag detection process to a power receiving device during the negotiation steps of the WPC standard. Specifically, the power supply device sends information indicating whether NFC tag detection processing has been performed and information indicating whether an NFC tag has been detected when NFC tag detection processing has been performed as a detection status to the power receiving device.

[0006] In recent wireless power transmission systems, there has been a need to increase the output of power to be transmitted. Countermeasures have been taken to improve user convenience by utilizing the increased output to achieve high-speed charging. Existing technical documents Patent documents

[0007] Patent Document 1: Japanese Patent 7336581 Summary of the Invention The problem the invention aims to solve

[0008] Frequency noise can be generated during wireless power transmission. This noise may interfere with the communication frequencies used for NFC tag detection, which can be performed during power transmission. As a result, the power transmitting device may be unable to perform NFC tag detection properly.

[0009] This disclosure provides techniques for properly performing NFC tag detection processing. Solution for solving the problem

[0010] A power supply device according to one aspect of this disclosure includes: a negotiation component configured to negotiate with a power receiving device; a power supply component configured to wirelessly supply power to the power receiving device based on the result of the negotiation; a processing component configured to perform processing including the detection of a near-field communication tag, i.e., an NFC tag; and a communication component configured to send information related to the NFC tag detection to the power receiving device at least during the negotiation, wherein the NFC tag detection is performed during power supply. Advantages of the invention

[0011] According to this disclosure, NFC tag detection processing can be performed appropriately. Attached Figure Description

[0012] Figure 1 This is a diagram illustrating an example configuration of a wireless power transmission system according to the first embodiment. Figure 2 This is a block diagram illustrating an example configuration of a powered device. Figure 3 This is a block diagram illustrating an example configuration of a power transmission device. Figure 4 This is a sequence diagram illustrating an example of the basic processing performed by the power supply device and the power receiving device according to the first embodiment. Figure 5 This is a flowchart illustrating an example of a processing flow performed by a powered device according to a first embodiment. Figure 6 This is an example Figure 5 The flowchart for the subsequent processing flow. Figure 7 This is an example Figure 6 The flowchart for the subsequent processing flow. Figure 8 This is an example Figure 7 The flowchart for the subsequent processing flow. Figure 9 This is a flowchart illustrating an example of a processing flow performed by a power supply device according to a first embodiment. Figure 10 This is an example Figure 9 The flowchart for the subsequent processing flow. Figure 11 This is an example Figure 10 The flowchart for the subsequent processing flow. Figure 12This is a sequence diagram illustrating an example of the processing flow performed by the power transmitting and receiving devices. Figure 13 This is a diagram illustrating an example of the state of an NFC tag between a power-giving device and a power-receiving device. Figure 14 This is a flowchart illustrating an example of a processing flow performed by a powered device according to a second embodiment. Figure 15 This is a flowchart illustrating an example of a processing flow performed by a power supply device according to a second embodiment. Figure 16 This is a sequence diagram illustrating an example of a processing flow performed by a power supply device and a power receiving device according to a second embodiment. Figure 17 This is a flowchart illustrating an example of a processing flow performed by a powered device according to a third embodiment. Figure 18 This is a flowchart illustrating an example of a processing flow performed by a power supply device according to a third embodiment. Figure 19 This is a sequence diagram illustrating an example of a processing flow performed by a power supply device and a power receiving device according to a third embodiment. Figure 20 This is a diagram illustrating an example of information sent from a power transmitting device to a power receiving device during negotiation. Figure 21 This is a diagram illustrating an example of a status notification command for a power supply device. Detailed Implementation

[0013] In the following description, embodiments of the present disclosure will be illustrated with reference to the accompanying drawings. All of the various features in the embodiments of the present disclosure are not to be considered essential, and these features can be combined arbitrarily. The configurations described in the following embodiments are merely examples, and the present disclosure is not limited to the illustrated configurations. The same or similar constituent elements in the drawings will be referred to by the same reference numerals, and repeated descriptions will be omitted.

[0014] [First Implementation] <System Configuration> Figure 1 This is a diagram illustrating an example configuration of a wireless power transmission system according to an embodiment. An example configuration of the wireless power transmission system according to this embodiment will be described. The wireless power transmission system includes, for example, a receiving device 101 and a transmitting device 102. In the following description, for simplicity, the transmitting device 102 may be referred to as TX, and the receiving device 101 may be referred to as RX.

[0015] An RX is, for example, an electronic device that receives power from a TX and uses that power to charge its built-in battery. An RX has Wireless Power Consortium (WPC) functionality based on the WPC standard and complies with the device certification protocol of that standard.

[0016] TX is, for example, an electronic device that wirelessly transmits power to RX placed on TX. TX wirelessly transmits power to RX via a power transmitting antenna.

[0017] In this system, it is assumed that wireless power transfer using electromagnetic induction, a method employed for contactless charging, is based on the WPC standard. That is, RX and TX perform wireless power transfer between the receiving antenna of RX and the transmitting antenna of TX, based on the WPC standard for contactless charging. The wireless power transfer method (contactless power transfer method) is not limited to the method specified in the WPC standard, and other electromagnetic induction methods, magnetic resonance methods, electric field resonance methods, microwave methods, or laser methods can be used, etc. In this embodiment, wireless power transfer is used for contactless charging, but wireless power transfer can be used for applications other than contactless charging.

[0018] In the WPC standard, the guaranteed power level when the RX receives power from the TX is defined by a value called the guaranteed power (i.e., the guaranteed load power) (hereinafter referred to as "GP"). GP indicates, for example, a power value (i.e., the load power of the RX) that guarantees the output of that power to the load (such as a charging circuit) of the RX even when the positional relationship between the RX and TX changes and the transmission efficiency between the receiving and transmitting antennas decreases. GP can be a load power level agreed upon through negotiation between the TX and RX. For example, when GP is 15 watts, the TX transmits power by controlling the output to the load in the RX to maintain 15 watts even when the positional relationship between the receiving and transmitting antennas changes and the transmission efficiency between them decreases.

[0019] <Configuration of the power receiving device> Figure 2 This is a diagram illustrating an example configuration of the RX according to this embodiment. The RX includes a control unit 201, a WPC communication unit 203, a powered antenna (powered coil) 204, a powered unit 205, a detection unit 206, a charging unit 207, a battery 208, a notification unit 209, an operation unit 210, a memory 211, and a timer 212.

[0020] Control unit 201 controls the entire RX. Control unit 201 includes, for example, one or more processors, such as a central processing unit (CPU) or a microprocessor unit (MPU). Control unit 201 can use timer 212 to measure time. Control unit 201 performs control, for example, by executing a control program stored in memory 211.

[0021] The control unit 201 may be constructed from hardware dedicated to a specific process (such as an application-specific integrated circuit (ASIC)). Alternatively, the control unit 201 may be constructed from an array of circuits (such as a field-programmable gate array) compiled to perform predetermined processes. While performing various processes, the control unit 201 stores the information to be stored in the memory 211.

[0022] In this embodiment, control unit 201 is described as a single component, but this disclosure is not limited thereto. For example, in a powered device, a WPC control unit that controls the processes associated with receiving power from a powered device may be separate from control unit 201. Alternatively, a WPC control unit that controls the processes associated with WPC communication may be separate from control unit 201. When control unit 201 is divided into multiple parts, these control parts are connected to each other via communication interfaces and communicate data with each other. The communication interface is not particularly limited, as long as it is an interface capable of enabling data communication such as I2C or GPIO.

[0023] WPC communication unit 203 communicates with TX communication unit 306 via wireless power transmission based on the WPC standard. WPC communication unit 203 communicates with TX by demodulating electromagnetic waves input from receiving antenna 204, acquiring information transmitted from TX, and performing load modulation on these electromagnetic waves to superimpose the information to be transmitted to TX onto them. In other words, communication performed by communication unit 306 is achieved by superimposing the information transmitted from TX's transmitting antenna 305 onto the electromagnetic waves.

[0024] The receiving unit 205 receives AC power (AC voltage and alternating current) via the receiving antenna 204. This AC power is generated through electromagnetic induction based on electromagnetic waves radiated from the transmitting antenna of TX. The receiving unit 205 converts the AC power into DC power or AC power of a predetermined frequency and outputs the conversion result to the detection unit 206. The receiving unit 205 is primarily an example of a receiving component that wirelessly receives power from a transmitting device based on negotiation.

[0025] The detection unit 206 detects that RX is placed on TX based on the WPC standard. The detection unit 206 detects, for example, at least one of the voltage and current values ​​of the powered antenna 204 when the powered unit 205 receives a digital Ping from the powered antenna 204 via the WPC standard. For example, when the voltage value is less than a predetermined voltage threshold or when the current value is greater than a predetermined current threshold, the detection unit 206 can determine that RX is placed on TX (powerable state).

[0026] The charging unit 207 uses power supplied from the power receiving unit 205 to charge the battery 208. Under the control of the control unit 201, the charging unit 207 starts or stops charging the battery 208, and further adjusts the power used to charge the battery 208 based on its state of charge. When the power used by the charging unit 207 changes, the power supplied from the power receiving unit 205 (that is, the power received in the RX) also changes accordingly. The charging unit 207 described herein is a load in the RX.

[0027] Battery 208 supplies the entire RX with the power required for control, power reception, and communication of the RX components by the control unit 201. Battery 208 accumulates the power received via the power receiving antenna 204.

[0028] The notification unit 209 uses any method, such as visual, auditory, or tactile methods, to notify the user of information. For example, the notification unit 209 notifies the user of the charging status of the RX, or as... Figure 1 The illustrated wireless power transmission system includes the status of power transmission for RX and TX. Notification unit 209 includes, for example, a liquid crystal display, LED, speaker, vibration generation circuitry, and / or other notification devices.

[0029] The operation unit 210 has a receiving function to receive operations from the user on the RX. The operation unit 210 may include, for example, buttons, a keyboard, a voice input device such as a microphone, a motion detection device such as an accelerometer or gyroscope sensor, and / or other input devices. A device that integrates the notification unit 209 and the operation unit 210, such as a touch panel, may be used.

[0030] As described above, memory 211 stores various types of information, such as identification information or device configuration information, or control programs. Memory 211 can store information acquired by control unit 201 and other functional units.

[0031] Timer 212 counts time, for example, using an up-counting timer to measure elapsed time from the start time or a down-counting timer to count down from the set time.

[0032] <Configuration of power transmission equipment> Figure 3 This is a diagram illustrating an example configuration of the TX according to this embodiment. The TX includes a control unit 301, a power supply unit 302, a power transmission unit 303, a detection unit 304, and a power transmission antenna (power transmission coil) 305. The TX also includes a communication unit 306, a notification unit 307, an operation unit 308, a memory 309, a timer 310, and a near-field communication (NFC) communication unit 311.

[0033] Control unit 301 controls the TX system, for example, by executing a control program stored in memory 309. In other words, control unit 301 controls... Figure 3 The illustrated functional units include: Control unit 301 controls power transmission in the TX; Control unit 301 controls NFC functionality in the TX; Control unit 301 can control applications other than wireless power transmission; Control unit 301 includes, for example, one or more processors, such as a CPU or MPU; Control unit 301 can be composed of a single processor, or the main control unit for overall control and the sub-control units for controlling power transmission processing or NFC communication can be implemented by different processors.

[0034] Control unit 301 may include dedicated hardware for specific processing, such as application-specific integrated circuits (ASICs), or array circuits such as FPGAs compiled to perform predetermined processing. Control unit 301 stores information to be stored in memory 309 while performing various processes. Control unit 301 may use timer 310 to measure time.

[0035] The power supply unit 302 supplies the entire TX with the power required for control, power supply, and communication with the TX via the control unit 301. The power supply unit 302 is, for example, a commercial power source or a battery. Power supplied from a commercial power source is stored in the battery.

[0036] The power transmission unit 303 generates electromagnetic waves for transmitting power to the RX by converting DC or AC power input from the power supply unit 302 into AC power in a frequency band suitable for wireless power transmission and inputting the AC frequency power to the power transmission antenna 305. The frequency of the AC power generated by the power transmission unit 303 is, for example, about several hundred kHz (e.g., 110 kHz to 205 kHz). Based on instructions from the control unit 301, the power transmission unit 303 inputs the AC frequency power to the power transmission antenna 305, causing the electromagnetic waves for transmitting power to the RX to be output from the power transmission antenna 305.

[0037] The power transmission unit 303 controls the intensity of the electromagnetic wave to be output by adjusting the voltage (transmission voltage) or current (transmission current) input to the power transmission antenna 305, or both. When the transmission voltage or current increases, the intensity of the electromagnetic wave increases, and when the transmission voltage or current decreases, the intensity of the electromagnetic wave decreases. Based on instructions from the control unit 301, the power transmission unit 303 controls the output of AC frequency power, thereby starting or stopping power transmission from the power transmission antenna 305. The power transmission unit 303 notifies the control unit 301 of the current power transmission, allowing the control unit 301 to be aware of the power transmission at arbitrary intervals. The measurement of the power transmission and the notification from the control unit 301 can be performed by units other than the power transmission unit 303. The power transmission unit 303 is primarily an example of a power transmission component used for wirelessly transmitting power to a receiving device based on negotiation.

[0038] The detection unit 304 detects whether an object is placed on the TX based on the WPC standard. Specifically, the detection unit 304 detects whether the object is placed on the interface surface of the TX. The detection unit 304 detects, for example, at least one of the voltage and current values ​​of the power transmission antenna 305 when the power transmission unit 303 has transmitted an analog Ping of the WPC standard via the power transmission antenna 305.

[0039] The detection unit 304 can detect changes in impedance. When the voltage value is less than a predetermined voltage value or when the current value is greater than a predetermined current value, the detection unit 304 can determine that an object is placed on TX. Whether the object is a powered device or another object is determined based on whether there is a predetermined response to a digital Ping subsequently sent from the communication unit 306. That is, when TX has received a predetermined response, it is determined that the object is a powered device; otherwise, it is determined that the object is an object other than a powered device.

[0040] Communication unit 306 conducts control communication with RX based on the WPC standard. Communication unit 306 communicates by modulating the electromagnetic waves output from the power transmitting antenna 305 and transmitting information to RX. Communication unit 306 demodulates the electromagnetic waves output from the power transmitting antenna 305 and modulated in RX, and acquires the information transmitted from RX. In other words, communication performed by communication unit 306 is achieved by superimposing information onto the electromagnetic waves transmitted from the power transmitting antenna 305.

[0041] The notification unit 307 uses any method, such as visual, auditory, or tactile methods, to notify the user of information. For example, the notification unit 307 notifies the user of information indicating the charging status of TX, or such as... Figure 1 The illustrated wireless power transmission system includes the status of power transmission for RX and TX. Notification unit 307 includes, for example, a liquid crystal display, LED, speaker, vibration generation circuitry, and / or other notification devices.

[0042] The operation unit 308 has a receiving function for receiving an operation on TX from a user. The operation unit 308 includes, for example, a button, a keyboard, a voice input device such as a microphone, a motion detection device such as an acceleration sensor or a gyro sensor, and / or other input devices. A device integrating the notification unit 307 and the operation unit 308 such as a touch panel can be used.

[0043] The memory 309 stores various types of information such as identification information or capability information, or a control program, etc. The capability information includes information for indicating whether a high-precision foreign object detection processing capability is equipped. The memory 309 can store the information acquired by the control unit 301 and other functional units.

[0044] The timer 310 counts time, for example, using an up-counter for measuring the elapsed time from the start time or a down-counter for counting down from the set time.

[0045] The NFC communication unit 311 is a hardware module for implementing the NFC function. Specifically, the NFC communication unit 311 implements a card emulation mode for replacing the role of a contactless IC card, a reader / writer mode for reading an NFC tag 801, and a P2P mode for directly exchanging messages between NFCs. For example, the card emulation mode is used to implement electronic money settlement.

[0046] The communication unit 306 and the NFC communication unit 311 can be implemented by a single piece of hardware or by different pieces of hardware.

[0047] <Basic sequences of TX and RX> Figure 4 It is a sequence diagram illustrating an example of the control flow performed by TX and RX based on the WPC standard.

[0048] TX transmits an analog Ping (hereinafter referred to as A-Ping) to detect an object (F400) near the power transmission antenna 305. A-Ping is pulsed power and is power for detecting an object. A-Ping is low power that is not sufficient to start the control unit 301 of RX even when RX receives A-Ping. TX detects an object based on the shift of the resonance frequency of the voltage value in the power transmission antenna 305 or the change in the voltage value and / or current value in the power transmission antenna 305 caused by an object near the power transmission antenna 305.

[0049] When an object is detected using A-Ping, TX measures the Q value of the power transmitting antenna 305 (details not described) (F401). When the Q value measurement ends, TX begins transmitting a digital Ping (hereinafter referred to as D-Ping) (F402). D-Ping is the power used to activate the control unit 301 of RX, and is a higher power than A-Ping. D-Ping is then continuously transmitted. That is, after the transmission of D-Ping has begun (F402), TX continuously transmits power equal to or higher than D-Ping until it receives End Power Transmission (EPT) data (F416) from RX to request a stop to power transmission.

[0050] When the RX receives a D-Ping and is activated, the RX sends a signal strength (F403) to the TX, which is data including the voltage value of the received D-Ping. Subsequently, the RX sends data including an ID (F404), which includes version information of the WPC standard on which the RX is based or device identification information. Additionally, the RX sends configuration data (F405) to the TX, including the maximum power supplied from the power receiving unit 205 to the load (or charging unit 207). The TX receives the ID and configuration data, and if it determines that the RX corresponds to an extended protocol after WPC standard v1.2 (which includes negotiation described later), it returns an ACK (F406).

[0051] Upon receiving an ACK, the RX transitions to a negotiation phase, where negotiations are conducted regarding the power to be transmitted and received. During the negotiation phase, the RX control unit 201 and the program used to implement the negotiation are examples of negotiation components. Similarly, the TX control unit 301 and the program used to implement the negotiation are examples of negotiation components. First, the RX sends Foreign Object Detection (FOD) status data (F407) to the TX. In this embodiment, the FOD status data is referred to as FOD(Q). The TX detects a foreign object based on the Q value stored in the received FOD(Q) and the Q value measured by measuring the Q value, and sends an ACK (F408) to the RX indicating a high probability that a foreign object is not present.

[0052] Upon receiving an ACK, the RX sends a General Request (Capability) (F409), which is data used to inquire about the capabilities of the TX and is a general request defined in the WPC standard. In the following description, the General Request (Capability) is referred to as GRQ (CAP). Upon receiving GRQ (CAP), the TX sends capability data (referred to as CAP) (F410) that includes capability information corresponding to the TX.

[0053] Then, the RX sends a General Request (ID) (called GRQ(ID)) (F411), which is data used to request the TX to send identification information, and is a general request defined in the WPC standard. This identification information includes the corresponding standard version. The TX responds to the request from the RX by sending the identification information (F412).

[0054] Subsequently, GP negotiation takes place between TX and RX. That is, GP is a value determined through negotiation with TX. The GP requested by RX is the power corresponding to RX's receiving capacity and can be set to, for example, the maximum value of RX's load power (power consumed by charging unit 207). Negotiation is achieved by sending data including the GP value requested by RX from the Specific Request (GP) data defined in the WPC standard to TX. In this embodiment, the data is referred to as Specific Request (GP) (SRQ(GP)).

[0055] Considering the power delivery capability of TX, TX responds to SRQ(GP). If TX determines that GP is acceptable, it sends an ACK (F414) indicating that the request is accepted; if it determines that the request is not acceptable, it sends a NAK indicating that the request is not accepted. When sending NAK, RX resends the requested GP value to the modified SRQ(GP) and checks the response from TX. The processes F413 and F414 are repeated until TX returns an ACK indicating that GP is accepted. In this embodiment, it is assumed that RX requests 100 watts as GP in the SRQ(GP).

[0056] Subsequently, the RX sends a GRQ (ACAP) (F415), which is data used to inquire about the TX's extended capabilities and is a general request defined in the WPC standard. ACAP is an abbreviation for Additional Capabilities. ACAP includes additional information related to the TX's capabilities. Details of ACAP will be described later. Upon receiving a GRQ (ACAP), the TX sends an ACAP (F416) including additional information corresponding to the TX.

[0057] When negotiation of multiple parameters including the GP concludes, the RX sends an SRQ(EN) (F417) to the TX to request the termination of the negotiation. The TX responds to the SRQ(EN) by sending an ACK (F418) and terminating the negotiation. The TX then transitions to the power transfer phase (F419), where the transmission and reception of power for the GP determined in the power transfer phase take place.

[0058] Upon receiving the ACK, RX connects the receiving unit 205 and the load (charging unit 207) and supplies the received power to the load. While supplying power to the load, RX sends a control error (hereinafter referred to as CE) packet to TX based on the load. Hereinafter, the CE packet is referred to as CEP. CEP includes a sign and a value. When the sign of the value included in CEP is positive, it means that the received voltage has increased by that value. When the sign of the value included in CEP is negative, it means that the received voltage has decreased by that value. When the value is zero (CE(0)), it means that the received voltage needs to be maintained. Controlling the received voltage is equivalent to controlling the received power. Here, RX sends, for example, CE(+)(F420) to TX to indicate an increase in the received voltage.

[0059] Upon receiving CE(+), TX changes the setting value of the power transmission circuit in power transmission unit 303 and increases the power transmission voltage (power transmission). When it is confirmed that the power received has increased in response to CE(+) (F421), RX supplies the power received to the load (e.g., charging unit 207) and sends a power received package (RPP) to TX (F422). Here, the power received by RX in the state where the output of power receiving unit 205 is supplied to the load is included in the RPP. TX, having received and confirmed the RPP, sends an ACK to RX (F423). Processes F420 to F423 are repeated during the power transmission phase.

[0060] For example, TX will include the processing of NFC tag detection for F424 and F425 (e.g., described later). Figure 12 The processing of F709 to F725 and F420 to F423 is performed in parallel. Specifically, processing including NFC tag detection means processing associated with NFC tag detection and adjustment (e.g., suppression) of the TX power supply. Figure 13 As illustrated, for example, suppose NFC tag 801 enters between TX and RX, and F424 and F425 are the processing for detecting the tag.

[0061] Specifically, the TX measures a predetermined time (F424) by periodically performing NFC tag detection. The predetermined time is an example of a time set by the NFC timer (described later) and is an execution wait time. The predetermined time is, for example, 50ms, but is not limited to this. When the predetermined time has elapsed, the TX performs NFC tag detection processing (F425). The TX can detect the presence of NFC tags during the power transfer phase by repeating NFC tag detection at predetermined intervals.

[0062] In this disclosure, "after ~ time has elapsed" literally means immediately following the elapsed time, and also means "at any time after the elapsed time". For example, "processing after ~ time has elapsed" is not limited to processing immediately following the elapsed time, but may include other processing immediately between the elapsed time and the target processing. The meaning of "after ~ time has elapsed" applies to phrases such as "after ~ has exceeded the threshold" or "after...".

[0063] When an NFC tag is detected, the TX, considering the possibility of electromagnetic damage to the NFC tag during power supply, controls the power supply to a predetermined value. This predetermined value is calculated based on various conditions and can have multiple values ​​depending on the conditions. The predetermined value can be 0W, meaning power supply can be stopped. "Depending on the conditions" means, for example, that when information regarding the permitted power of the NFC tag is included in the NFC tag information, the TX controls the power supply to be equal to or less than the permitted power. Alternatively, "Depending on the conditions" means, for example, that when information indicating permitted power supply is not included in the NFC tag information, the TX sets the power supply to, for example, a minimum value or stops power supply.

[0064] It should be noted here that the power supply adjustment process, including NFC tag detection, differs from the process of controlling the power supply to a predetermined value when an NFC tag is detected. Details will be described later.

[0065] Control unit 301, NFC communication unit 311, program for implementing NFC tag detection, and program for communicating with RX during power transmission are examples of processing components for performing processes including NFC tag detection. Control unit 301, communication unit 306, and program for communicating with RX during negotiation or power transmission are examples of communication components in a power transmission device. Similarly, control unit 201, WPC communication unit 203, and program for communicating with TX are examples of communication components in a power receiving device.

[0066] When the charging of battery 208 is finished, RX sends End Power Transfer (EPT) data (F426) to request TX to stop power delivery.

[0067] The control flow between TX and RX based on the WPC standard has been described to date. This control flow is the basic processing sequence between TX and RX in wireless power transmission.

[0068] The following will describe the main stages of high-output power transmission, when... Figure 13The illustrated process describes the handling when the NFC tag 801 enters between TX and RX. In this case, according to this embodiment, appropriate power transmission can be performed and NFC tag detection can be reliably achieved. This will refer to... Figures 5 to 12 Describe it. Figures 5 to 8 This is a flowchart illustrating the processing flow performed by RX. Figures 9 to 11 This is a flowchart illustrating the processing flow performed by TX. Figure 12 This is a sequence diagram illustrating the processing flow performed by TX and RX.

[0069] In this embodiment, TX and RX exchange various types of information during a negotiation phase prior to the power delivery phase to reduce (decrease) the power delivery during NFC tag detection in the high-output power delivery phase. During the power delivery phase, TX uses this information to adjust (e.g., reduce) the power delivery during periodic NFC tag detection, and the corresponding RX responds to the power delivery adjustments made by TX. This cooperation between TX and RX achieves compatibility between high-output power delivery and NFC tag detection.

[0070] <Processing flow in the power receiving device> Figures 5 to 8 This is a flowchart illustrating an example of the processing flow performed by RX. Figure 5 It is a flowchart illustrating the processing flow during the negotiation phase, and Figure 6 , Figure 7 and Figure 8 This is a flowchart illustrating the processing flow during the power delivery phase. This processing flow can be implemented, for example, by having the RX control unit 201 execute a program read from memory 211. At least a portion of the following sequence can be implemented in hardware. In this case, the hardware can be implemented, for example, by automatically generating a dedicated circuit using a gate array circuit (such as an FPGA) from the program used to implement the processing steps using a predetermined compiler. This processing flow can be initiated by turning on the RX, by starting the RX using power supplied from battery 208 or TX, or by having the RX user input an instruction to begin a contactless charging application. Other triggers can be used to start this processing flow.

[0071] In S5001, RX performs basic command processing during the negotiation phase. Assume processing of F407 to F414 in this sequence diagram. In S5002, RX sends a GRQ (ACAP) message. Various messages are sent from RX to TX by causing control unit 201 to send a message to WPC communication unit 203.

[0072] In S5003, the RX waits for an ACAP message from the TX. The RX receives the message sent from the TX by polling the WPC communication unit 203 via the control unit 201. The RX checks the message and stores the received information in S5004.

[0073] In this embodiment, it can be assumed that Figure 20 The details and format illustrated in (A) are used as messages sent from TX. RX can receive information from TX related to B0 "Power supply suppression threshold (e.g., 80W)" / B1 "Interrogation time" / B2 "Power supply at power supply suppression" / B3 "Power supply suppression time".

[0074] The “power transmission suppression threshold” is the threshold of the power transmission amount used to trigger power transmission suppression.

[0075] "Interrogation time" is the process of NFC tag detection, including the power transmission phase (described later). Figure 12 The time until an inquiry is sent to the TX (F709 to F724) is specified in the table. Here, an inquiry means a request from the RX for the TX to send predetermined information to the RX. The predetermined information includes, for example, the time until the TX actually performs NFC tag detection. The predetermined information also includes B2 "Power during power-off suppression" and B3 "Power-off suppression time".

[0076] As will be described later, the timing for the start of the interrogation period (sending the transmission request) is after the RX has received and acknowledged the "Power Suppression On / Off (ON / OFF) Switching Information" (from Off to On in this document) from the TX. The RX needs to acknowledge the timing for NFC tag detection in preparation for power suppression when using the TX for NFC tag detection. As will be described later, preparation for power suppression mainly involves adjusting the processing load on the RX side. In this embodiment, it is assumed that the RX is performing CE (CEP) or RPP transmission processing. Therefore, as will be described later, the RX sends an interrogation triggered by a CEP or RPP transmission that occurs after the timer based on the interrogation period starts or fires. The interrogation period is, for example, 30ms and is not limited to this. "Interrogation period" is an example of an interrogation waiting time.

[0077] "Power supply during power supply suppression" refers to the power supply during the period when power supply is suppressed ("power supply suppression time"). The power supply during power supply suppression may have a value equal to or less than the "power supply threshold", and is, for example, 40W. As will be described in [Other Embodiments], the cessation of power supply (i.e., 0W) is also included in "power supply suppression". The information of "power supply during power supply suppression" is an example of adjusting power information.

[0078] "Power transmission suppression time" is the duration during which power transmission is suppressed. The information on "power transmission suppression time" is an example of duration information.

[0079] In S5005, RX sends SRQ / EN to end the negotiation phase. In S5006, RX waits for ACK, and after ACK is confirmed, the negotiation phase ends and transitions to the power transmission phase following S5101.

[0080] refer to Figure 6 In S5101, the RX determines whether command processing is required. If command processing is required, the processing flow proceeds to S5102. If command processing is not required, other processing is performed in S5117, and the processing flow returns to S5101. A command primarily refers to a request sent from the RX side to the TX side. For example, when the determination result of S5101 is "yes," the command is either CEP or RPP.

[0081] In S5102, RX confirms whether the current power supply suppression is on or off during NFC tag detection. The process from S5103 via S5108 (if "yes") to S5101 is a process in the state where power supply suppression is off, and is a process in the state where the power supply does not exceed the "power supply suppression threshold" (e.g., 80W).

[0082] In S5103, RX determines whether to send a CE (CEP). If a CE is to be sent, RX sends a CE to TX in S5104. If a CE is not to be sent, RX performs other command processing in S5116. Regardless of whether power supply suppression is on or off, a CE (that is, a request for control of power supply to TX) is performed (S5104 and S5121, which will be described later).

[0083] In S5105, RX acknowledges the power delivery from TX in response to the sent CE (F421). After acknowledging the power delivery (change), in S5106, RX sends a Power Received Packet (RPP) to TX (F421). In S5107, RX waits for a response from TX for the RPP, and when a response is received, in S5108, it acknowledges the type of the response. When the response is ACK in S5108 (F423), RX returns the processing flow to S5101. When the response is ATN (Yes in S5109), in S5110, RX sends a Data Stream Response (DSR) / polling to TX. ATN is a response indicating that TX will send additional information to RX.

[0084] In S5111, RX waits for a response to DSR / polling and confirms the details of the response in S5112. When the details of the response are "power supply suppression on / off switching information" during NFC tag detection, RX confirms the details of the switching information in S5113 and returns the processing flow to S5101.

[0085] The power supply suppression on / off switching information is used to indicate whether power supply suppression is started or deactivated during NFC tag detection in the power supply phase of the power transmission stage. Specifically, the power supply suppression on / off switching information is used to indicate "switching from off to on" to start power supply suppression and to indicate "switching from on to off" to deactivate power supply suppression. When the result of S5112 is "yes", the information indicating "switching from off to on" is received. Here, since the current processing is via the process that was "no" in S5102, "yes" in S5112 means "switching from off to on", and it means that the power supply exceeds a threshold (e.g., 80W).

[0086] In the following description, the "switch from off to on" used for power supply suppression processing is referred to as "off → on", and the "switch from on to off" is referred to as "on → off". In the following description, "power supply suppression on / off switching information" may be abbreviated as "switching information".

[0087] On the other hand, when the details are not "switching information" ("No" in S5112), RX performs processing in S5114 corresponding to the details of the response received in S5112, and returns the processing flow to S5101. When the response in S5107 is neither ACK nor ATN ("No" in S5108 and S5109), RX performs processing in S5115 corresponding to the details of the response received in S5112, and returns the processing flow to S5101.

[0088] The following will refer to Figure 7 This describes the processing flow when power-on suppression is enabled during NFC tag detection in S5102. In S5118, RX determines whether to send a CE (CEP). If a CE is to be sent, RX starts a timer in S5119. If a CE is not to be sent, RX performs other command processing in S5135 and returns the processing flow to S5101.

[0089] In S5119, RX sets the timer to the "interrogation time" obtained from TX in S5002 to S5004. For ease of explanation, the timer will be referred to as the "interrogation timer" in the following description. The timer is started by operating timer 212 from control unit 201. In S5120, RX confirms whether the interrogation timer has been activated, that is, when the set time has elapsed (or whether the current time has reached the set time). Confirmation of the interrogation timer's activation is achieved by having control unit 201 poll timer 212. When the activation of the interrogation timer is confirmed, RX sends CE in S5121 and confirms power supply in S5122. This process is the same as that in S5104 and S5105.

[0090] Since the power supplied in S5121 is greater than a threshold (e.g., 80W), it is preferable to send CE(-) in S5121 to reduce the power supplied. However, this disclosure is not limited to sending CE(-), but CE(+) or CE(0) can also be sent. Even when CE(+) or CE(0) is sent, TX can ignore the request and perform power supply suppression (S6120, which will be described later).

[0091] In S5123, RX sends an RPP and waits for an ATN in S5124. In the process of enabling power-off suppression during NFC tag detection (processing after S5118), it is assumed that an ANT is sent from TX in response to an RPP (S6111, described later). After receiving the ATN, in S5125, RX sends a DSR / polling to TX.

[0092] The RX waits for a response to the DSR / polling in the S5126, and as Figure 8 As illustrated, the details of the response are confirmed in S5127. When the power supply is exceeding the threshold ("No" in S6110, which will be described later) as described above, and the details of the response are not switching information ("No" in S5127), the received response details mean that the time up to NFC tag detection has been acquired by the RX. That is, in S6114, which will be described later, the TX sends the time information up to NFC tag detection, and the RX receives this time information. In this case, the RX confirms the response information in S5128 and starts a timer in S5129. In S5129, a time corresponding to the time up to NFC tag detection acquired in S5128 is set.

[0093] In S5130, RX confirms whether the timer has been fired. After the timer has been fired, in S5131, RX adjusts the processing load in RX. Adjusting the processing load means controlling the processing load of RX so that RX can operate within the range of the "power during power-on suppression" obtained from TX in S5002 to S5004. Specifically, the following example of processing load adjustment is conceivable. During the "power-on suppression time" obtained from TX in S5004, software with a high processing load in the software being processed by control unit 201 is stopped. Alternatively, during the "power-on suppression time" of the processing load, the clock of control unit 201 can be set low. Mainly, control unit 201 and the program for adjusting the processing load are examples of adjustment components for adjusting the processing load of a powered device.

[0094] Subsequently, in S5132, RX waits for the power supply to be restored. This is achieved by having control unit 201 poll the powered unit 205. When the power supply is restored, RX releases the control of the processing load performed in S5131 in S5133 and returns the processing flow to S5101. When the details of the response in S5126 are "power supply suppression on / off switching information" ("Yes" in S5127), RX confirms the details of the switching information in S5134 and returns the processing flow to S5101. Here, the switching information is information used to indicate that the power supply suppression control during NFC tag detection during power supply is "on → off". That is, this means that the power supply is less than a threshold (e.g., 80W).

[0095] As described above, RX can handle power supply suppression during NFC tag detection that switches as the power supply changes, while TX is communicating.

[0096] <Processing flow in power transmission equipment> Figures 9 to 11 This is a flowchart illustrating an example of the processing flow performed by TX. Figure 9 It is a flowchart illustrating the processing flow during the negotiation phase, and Figure 10 and Figure 11 This is a flowchart illustrating the processing flow in the power transmission stage. This processing flow can be implemented, for example, by having the TX control unit 301 execute a program read from memory 309. At least a portion of the following sequence can be implemented in hardware. In this case, the hardware can be implemented, for example, by automatically generating a dedicated circuit using a gate array circuit (such as an FPGA) from the program used to implement the processing steps using a predetermined compiler. This processing flow can be initiated by turning on the power to the TX. This processing flow can be started using other triggers.

[0097] In S6001, TX waits for a request to be received. Receiving a request in TX can be achieved by having control unit 301 poll communication unit 306. TX waits in S6001 until a request is sent. When a request is received, TX performs the corresponding processing after S6002.

[0098] TX confirms whether the request received in S6001 is a GRQ (ACAP). This corresponds to the transmission of a GRQ (ACAP) from RX in S5002. When the request is a GRQ (ACAP), TX sends an ACAP in S6003. This is the information received by RX in S5004, and as described above. Figure 20 The parameters illustrated in (A) are B0 "Power supply suppression threshold (e.g., 80W)" / B1 "Interrogation time" / B2 "Power supply suppression at time" / B3 "Power supply suppression time". The transmission from TX in S6003 is achieved by having control unit 301 write a message to communication unit 306. After ACAP has been sent, the processing flow returns to S6001.

[0099] When the request in S6002 is not GRQ (ACAP), TX confirms in S6004 whether the request received in S6001 is SRQ / EN. If the request is SRQ / EN, TX sends an ACK in S6005, ending the negotiation phase and allowing the processing flow to proceed from S6101 to the power delivery phase. When the request is not SRC / EN, TX performs the processing corresponding to the received command in S6006 and returns the processing flow to S6001. S6006 corresponds to the processing in S5001 in RX and corresponds to the processing from F407 to F414 in the sequence diagram.

[0100] refer to Figure 10 In S6101, RX confirms whether a request has been received from RX. When the request is CE, TX causes the processing flow to proceed to S6103, and controls the power supply according to the request for CE from RX. The power supply is controlled by the control unit 301 controlling the power supply unit 303.

[0101] In S6104, TX waits for RPP. Upon confirmation of RPP reception, TX confirms the details of RPP in S6105 to verify the power received on the RX side. In S6106, TX determines whether a power supply suppression on / off switch ("off → on" or "on → off") during NFC tag detection is necessary. TX makes this determination in S6106 by verifying its own power supply. By having control unit 301 verify power supply unit 303, the power supply from TX at that point in time can be confirmed.

[0102] Control unit 301 determines "off → on" when the power supply value is greater than a threshold (e.g., 80W), and determines "on → off" when the power supply value is equal to or less than the threshold. TX sends ATN in S6107, and then waits for DSR / polling from RX in S6108. When the reception of DSR / polling is confirmed, TX sends power supply suppression on / off switching information to RX in S6109, and returns the processing flow to S6101. The switching information sent in S6109 can be confirmed by RX in S5113 or S5134.

[0103] If it is determined in S6106 that power supply suppression switching is unnecessary, TX confirms in S6110 whether the power supply is equal to or less than a threshold (e.g., 80W). When the power supply is equal to or less than the threshold, it means that power supply suppression is off and that the normal power transmission phase has begun. Therefore, TX sends an ACK in S6111 and the processing flow returns to S6101.

[0104] On the other hand, when it is determined in S6110 that the power supply exceeds the threshold, TX sends an ATN in S6112 to send switching information to RX, and waits for DSR / polling from RX in S6113. Upon confirmation of DSR / polling reception, TX sends the time until NFC tag detection in S6114 and returns the processing flow to S6101. The time until NFC tag detection sent in S6114 is information confirmed by RX in S5128 and is related to the execution wait time. This means the remaining time of the NFC timer's setting time (execution wait time, e.g., 50ms), which will be started in S6126 or S6128 described later. The remaining time of the NFC timer's setting time is an example of the remaining execution time. Confirmation of the remaining time of the NFC timer is achieved by having control unit 301 confirm the remaining time of the corresponding timer of timer 310.

[0105] When the request in S6102 is not CE, TX performs other command processing in S6115 and returns the processing flow to S6101.

[0106] When no request is received from RX in S6101, TX references... Figure 11To determine whether NFC processing (NFC tag detection processing) needs to be performed in S6116, TX checks in S6117 whether the NFC timer has been started when NFC processing is to be performed. If NFC processing is not to be performed, other processing is performed in S6127, and the processing flow returns to S6101. The timer in S6117 is an NFC timer (e.g., 50ms) used for periodic NFC tag detection, and is implemented as described above by having the control unit 301 confirm the timer 310.

[0107] When the NFC timer has been started in S6117, TX confirms in S6118 whether the NFC timer has been activated. If the NFC timer has not been activated, TX starts the NFC timer in S6128 and returns the processing flow to S6101. The NFC timer is activated by the control unit 301 setting the time in timer 310. The activation of the NFC timer is confirmed by the control unit 301 confirming the corresponding timer of timer 310. When the NFC timer has not been activated in S6118, TX returns the processing flow to S6101. When the NFC timer has been activated, TX then performs power-on suppression and NFC tag detection.

[0108] First, in S6119, TX checks if the supplied power exceeds a threshold. If the supplied power exceeds the threshold, TX performs power supply suppression in S6120, then performs NFC tag detection in S6121. If the supplied power is equal to or less than the threshold, the processing flow proceeds directly to S6121. The power used in the processing of S6120 is... Figure 20 The "power during power supply suppression" in (A). The NFC tag detection processing of S6121 is achieved by having the control unit 301 control the NFC communication unit 311.

[0109] In S6122, TX checks whether power supply suppression is in progress. If power supply suppression is in progress, it restores power supply in S6123 and then returns the processing flow to S6124. If power supply suppression is not in progress, TX directly proceeds to S6124 and determines whether an NFC tag has been detected.

[0110] When an NFC tag is detected, various countermeasures can be considered for the TX. In this embodiment, the TX reduces the power supply to a level that does not affect the NFC tag in S6125, and then returns the processing flow to S6101. If no NFC tag is detected in S6124, the TX starts an NFC timer in S6126 for the next NFC tag detection, and then returns the processing flow to S6101.

[0111] By suppressing the power supply of TX in S6120, noise affecting communication during NFC tag detection can be suppressed, and appropriate NFC tag detection processing can be performed. On the other hand, for example, by controlling the power supply of TX to a predetermined value in S6125, damage to the NFC tag detected in S6124 by electromagnetic waves can be suppressed. The predetermined value is a value calculated based on the situation and can have multiple values ​​depending on the situation. "Controlled to a predetermined value" is the same as described above. In this way, power supply suppression in S6120 is performed to properly detect the NFC tag, and power supply control in S6125 is performed to suppress damage to the NFC tag after it has been detected. In this way, the two differ in purpose and execution timing.

[0112] As described above, TX communicates with RX and can perform power transmission processing during the NFC tag detection phase by switching power supply suppression on / off as the power supply changes.

[0113] <TX and RX sequence during high-output power delivery> Figure 12 Here is a sequence diagram illustrating the following example: In Figure 4 In the normal sequence of the illustrated power transmission phase, the power transmitted is greater than a threshold (e.g., 80W), and NFC tag detection is performed while power transmission is suppressed.

[0114] RX sends, for example, CE(+) (F701). TX, having received CE(+), responds to the request from RX by controlling the power supply (F702). TX confirms through power supply control that the power supply is greater than a threshold (F703, "Yes" in S6106, "Yes" in S5102). While confirming that the received power has increased in response to CE(+) (F704), RX sends RPP to TX (F705). RPP includes the received power value in the state where RX has supplied the output of the powered unit 205 to the load (charging unit 207).

[0115] The TX, having confirmed the RPP, sends an ATN to the RX (F706). The RX, having received the ATN, sends a DSR / polling to the TX (F707). The TX, having received the DSR / polling, sends a power-suppression enable message to the RX (enabled in F708 and S6109). Therefore, both TX and RX confirm that power-suppression is performed during NFC tag detection.

[0116] In F708 (S6109), a power-on suppression "off → on" message is sent to RX, and at the timer when RX receives this message ("yes" in S5112), the process including NFC tag detection in the power-on suppression state begins (F709 to F724). In the process including NFC tag detection, as described later, TX starts an NFC timer (F709, S6128) until NFC tag detection is performed as a step before the NFC tag is actually detected. When the message "off → on" is received, RX starts an interrogation timer for "interrogation time" (ACAP information in F416) (F710, S5119).

[0117] RX sends CE (F712, S5121) upon activation of the interrogation timer (F711, S5120). TX responds to CE to control the power supply (F713, S6103). When a change in the received power in response to CE is confirmed (F714 and S5121), RX sends RPP (F715, S5123) to TX. RPP includes the received power value in the state where RX has supplied the output of the power receiving unit 205 to the load (charging unit 207).

[0118] Here, it is assumed that the power supply suppression is still enabled, meaning that the power supply exceeds the threshold (No in S6106, No in S6110). The TX that has confirmed the RPP sends an ATN to the RX (F716, S6112). The RX that has received the ATN (Yes in S5124) sends a DSR / polling to the TX (F717, S5125). The TX that has received the DSR / polling (Yes in S6113) sets the time information until NFC tag detection (execution remaining time) and sends the time information to the RX (F718, S6114). The RX that has received the time until NFC tag detection (Yes in S5126) starts the timer and sets the time (F719, No in S5127, S5128).

[0119] When the timer on the RX side is triggered until NFC tag detection ("Yes" in F720, S5130), the RX adjusts its processing load (F721, S5131). On the other hand, when the NFC timer on the TX side is triggered ("Yes" in F722, S6118), the TX suppresses power supply (F723, S6120). Then, the TX performs NFC tag detection processing (F724, S6121) and restores power supply (F725, S6123). The RX, having confirmed power supply restoration ("Yes" in S5132), removes the processing load adjustment (F716, S5133). As long as the power supply is greater than the threshold, the processing from F709 to F724 is repeated.

[0120] Frequency noise is generated in wireless power transmission, and for example, as the output increases, the frequency band of the generated noise becomes wider and the generated noise becomes larger. As the increase in output progresses, there is a possibility, for example, that noise will occur that interferes with the communication frequency (e.g., 13.56 MHz) that can be used for NFC tag detection during power transmission. Therefore, there is a concern that NFC tag detection will not be able to be performed properly unless any countermeasures are taken. However, according to this embodiment, during the negotiation phase, TX uses ACAP to send "power-on suppression threshold" / "interrogation time" / "power at power-on suppression" / "power-on suppression time" to RX. Then, when TX confirms the power supply during the power transmission phase and the power supply is greater than the threshold, RX should perform power-on suppression performed by TX during the NFC tag detection processing in the power transmission phase. Therefore, TX can reliably perform NFC tag detection during the power transmission phase. As a result, even in cases where communication noise affecting NFC tag detection is generated as the power supply increases, NFC tag detection processing can be performed appropriately and reliably. That is, in this embodiment, high-output wireless power transmission can be made compatible with NFC tag detection performed during wireless power transmission.

[0121] In this embodiment, CEP / RPP-based command processing is used. However, in the communication during NFC tag detection processing in the power delivery phase (communication after F710), RPP can be used instead of CEP. Therefore, processing efficiency can be improved. Messages specifically for NFC tag detection in the power delivery phase can also be defined.

[0122] [Second Embodiment] As a second embodiment, the following will mainly describe embodiments similar to the first embodiment, such as... Figure 13The illustrated processing flow describes the process when the NFC tag 801 enters between TX and RX during a high-output power transfer phase. In this embodiment, TX and RX communicate during the power transfer phase using information sent and received during the negotiation phase, while simultaneously communicating information about the power supply and suppression time for each NFC tag detection process. Therefore, flexible power supply suppression is achieved. In this embodiment, descriptions of elements or functions identical to those in the first embodiment will be omitted.

[0123] <Processing flow in the power receiving device> During the negotiation phase, RX conducted discussions with... Figure 5 The processes illustrated in S5001 to S5006 are the same. In this embodiment, it can be assumed that... Figure 20 The details and format illustrated in (B) are as messages obtained from TX using ACAP in S5002 to S5004. That is, RX obtains B0 "Power supply suppression threshold (e.g., 80W)" / B1 "Interrogation time".

[0124] Figure 14 This is a flowchart illustrating the processing flow performed by the RX during the power transmission phase. This processing flow can be implemented, for example, by having the RX control unit 201 execute a program read from memory 211. During the power transmission phase, the RX performs... Figure 6 The processes illustrated in S5101 to S5130, S5134 and S5135 are the same.

[0125] The processing following "Yes" in S5130 is the same as the processing following S9131. The timing in S5130 is as follows: when the power supply is greater than a threshold, after the time up to the NFC tag detection has been obtained from TX (from S6114 via "Yes" in S5126 to S5128), the time is measured by a timer up to that time. This is the same as in the first embodiment.

[0126] In this embodiment, RX processes CEP / RPP again in S9131. The processing from S9131 to S9136 is the same as that from S5121 to S5126. The information received by RX from TX in S9136 is the "power during power-off suppression" / "power-off suppression time" information when NFC tag detection processing is performed at this time. Based on the received information, RX performs processing associated with the processing load in a similar manner to the processing after S5131 to S5133.

[0127] As described above, RX can handle power supply suppression during NFC tag detection processing that switches as the power supply changes while TX is communicating.

[0128] <Processing flow in power transmission equipment> TX conducted negotiations with Figure 9 The processing in S6001 to S6006 is the same. In this embodiment, the data sent to RX using ACAP in S6002 and S6003 is... Figure 20 The information illustrated in (B) includes the values ​​for “power supply suppression threshold” / “interrogation time”.

[0129] Figure 15 (A) and Figure 15 (B) is a flowchart illustrating the processing flow performed by TX during the power transmission phase. This processing flow can be implemented, for example, by having the TX control unit 301 execute a program read from memory 309.

[0130] like Figure 15 As illustrated in (A), TX performs a communication with [other entities] during the power transmission phase. Figure 10 The processing from S6101 to S6113 and S6115 is the same. The timing of S6113 is as follows: when the power supply is greater than the threshold, after TX has responded to the RPP command received by RX by sending ATN, DSR / polling is received from RX.

[0131] After S6113 is "Yes", TX confirms in S1514 whether the "time until NFC tag detection" has been sent to RX. In this embodiment, it is assumed that two communications (two CEP / RPP processes) are performed during NFC tag detection. Therefore, in S1514, TX confirms whether the transmission of the "time until NFC tag detection" has been completed through the first communication.

[0132] If the "time until NFC tag detection" has not yet been sent, TX sends the "time until NFC tag detection" as the first communication in S1515. This is the same as the processing in S6114. On the other hand, if the "time until NFC tag detection" has already been sent, TX sends the power supply and suppression time during power supply suppression as the second communication in S1516, and the processing flow returns to S6101. The information sent in S1516 is received by RX in S9137.

[0133] like Figure 15As illustrated in (B), TX performs the same processing as in S6101 ("No"), S6116 to S6118, and S6119. In S1522, TX checks whether the power supply and suppression time for suppression have been sent. This means checking whether the power supply and suppression time for suppression in S1516 have been sent to RX for power supply suppression in subsequent processing. When this information is sent, TX performs the same processing as in S6120 to S6126. If this information has not been sent, TX returns to S6101, performs the processing of S1516, and then returns to S1522 again. TX targets... Figure 11 The illustrated S6127 and S6128 perform the same processing.

[0134] As described above, TX communicates with RX and can process the power transmission phase while switching power supply suppression on / off during NFC tag detection, depending on the change in the power supply.

[0135] <TX and RX sequence during high-output power delivery> Figure 16 This is a sequence diagram illustrating the processing sequences for TX and RX. Figure 16 In, similar to Figure 12 Assume: In Figure 4 In the normal sequence of the illustrated power transmission phase, the power transmitted is greater than a threshold (e.g., 80W), and NFC tag detection is performed while power transmission is suppressed.

[0136] The processing of F1101 to F1120 is the same as that of F701 to F720. The processing of F1121 to F1126 (sending from CE to DSR / polling) is the same as that of F1112 to F1117.

[0137] The TX, which has received the DSR / polling, sends information about the power supply and suppression time to the RX in F1127. This corresponds to the processing in S1516. The processing in F1128 to F1133 is the same as that in F721 to F726. As long as the power supply is greater than the threshold, the processing in F1109 to F1133 is repeated.

[0138] As described above, according to this embodiment, during the negotiation phase, TX sends a "power-on suppression threshold" / "interrogation time" to RX using ACAP. Then, when TX confirms power delivery during the power transfer phase and the power delivery is greater than the threshold, it sends the "power-on suppression threshold" / "interrogation time" for each NFC tag detection process during the power transfer phase. That is, in the first embodiment, "power at power-on suppression" / "power-on suppression time" is sent during the negotiation phase, but in this embodiment, information is sent dynamically (whenever NFC tag detection processing is required) even during the power transfer phase. By making RX respond to power-on suppression performed by TX, NFC tag detection can be reliably performed during the power transfer phase. Therefore, even in cases where noise affecting communication in NFC tag detection is generated as the power delivery increases, NFC tag detection processing can be performed appropriately and reliably. In other words, in this embodiment, high-output wireless power transfer can be made compatible with NFC tag detection performed during wireless power transfer.

[0139] [Third Embodiment] As a third embodiment, the following will mainly describe embodiments similar to the first and second embodiments, such as... Figure 13 The illustrated processing flow describes the process when the NFC tag 801 enters between the TX and RX during a high-output power delivery phase. In this embodiment, when NFC tag detection processing is performed in the power-off suppression enabled state, regardless of any queries from the RX, the TX sends information related to power-off suppression (the TX status notification information described later) to the RX to perform power-off suppression. Therefore, more flexible power-off suppression is achieved. In this embodiment, descriptions of elements or functions identical to those in the first and second embodiments will be omitted.

[0140] <Processing flow in the power receiving device> During the negotiation phase, RX conducted discussions with... Figure 5 The processes illustrated in S5001 to S5006 are the same. In this embodiment, it can be assumed that... Figure 20 The details and format illustrated in (C) are as messages obtained from TX using ACAP in S5002 to S5004. That is, RX obtains B0 "the threshold for power supply suppression (e.g., 80W)".

[0141] Figure 17 This is a flowchart illustrating the processing flow performed by the RX during the power transmission phase. This processing flow can be implemented, for example, by having the RX control unit 201 execute a program read from memory 211.

[0142] like Figure 6As illustrated in the processing flow, in S5101, RX determines whether command processing is required. When command processing is required, RX determines in S1702 whether the command processing is a send operation, and if the command processing is a send operation, the processing flow proceeds to S5103. Figure 6 ).like Figure 6 As illustrated, RX performs processing steps S5103 to S5116, and performs processing step S5117 when the result of S5101 is "no".

[0143] When command processing in S1702 is not transmission processing, the RX performs command reception processing in S1718. In this embodiment, since it is assumed that the command is also issued from the TX, the RX performs processing for receiving commands issued from the TX. Command reception processing in the RX is implemented by having the control unit 201 poll the WPC communication unit 203. In S1718, the RX confirms whether the command received from the TX is a TX status notification command. When the received command is not a TX status notification command, the RX processes the corresponding command in S1725 and returns the processing flow to S1701.

[0144] When the command received in S1718 is a TX status notification, the RX confirms the details of the command in S1719. The RX can use the TX status notification to confirm the current status of TX. Figure 21 This is a diagram illustrating the details and format of the TX status notification command. In addition to the TX status information, the TX status notification command also includes B1 "Power at power-on suppression" / B2 "Power-on suppression time".

[0145] In S1720, RX sends an ACK to TX. In S1721, RX determines whether power-on suppression is enabled during NFC tag detection processing. When power-on suppression is enabled, in S5131, similar to the first and second embodiments, RX uses the information of "power during power-on suppression" / "power-on suppression time" from the TX status notification command received in S1718 to adjust the processing load of RX. Afterwards, RX performs... Figure 6 The processing of S5132 and S5133 in the process.

[0146] <Processing flow in power transmission equipment> TX conducted negotiations with Figure 9 The processing in S6001 to S6006 is the same. In this embodiment, the data sent from TX using ACAP in S6002 and S6003 is... Figure 20 The information illustrated in (C) includes B0, “threshold for power supply suppression”.

[0147] Figure 18This is a flowchart illustrating an example of the processing flow performed by the TX during the power transmission phase. This processing flow can be implemented, for example, by having the TX control unit 301 execute a program read from memory 309.

[0148] TX performs with during the power transmission phase Figure 10 The processing is the same as that for S6101 to S6119 where "yes" is selected, and the processing is the same as that for S6101 to S6114 and S6115 where "yes" is selected.

[0149] After S6118, when the supplied power exceeds a threshold (e.g., 80W) in S6119, the TX needs to perform NFC tag detection under the condition that the supplied power exceeds the threshold, thus requiring power supply suppression. Therefore, in this embodiment, it is assumed that the command is sent from the TX side to the RX. In S1820, the TX prepares information on "power supply at power supply suppression" / "power supply suppression time", and in S1821, it sends this information as a TX status notification command ( Figure 21 Send to RX.

[0150] In S1822, TX waits for an ACK from RX, and then proceeds. Figure 11 The processing of S6120 to S6126 in the process.

[0151] <TX and RX sequence during high-output power delivery> Figure 19 This is a sequence diagram illustrating the processing sequences for TX and RX. Figure 19 In, similar to Figure 12 and Figure 16 Assume: In Figure 4 In the normal sequence of the illustrated power transmission phase, the power transmitted is greater than a threshold (e.g., 80W), and NFC tag detection is performed while power transmission is suppressed.

[0152] The processing for F1401 to F1409 is the same as that for F701 to F709. Afterward, TX confirms the activation of the NFC timer already started in F1409 (F1410). When the NFC timer is activated, TX sends a TX status notification command to RX (F1411), and RX returns an ACK (F1412).

[0153] RX adjusts the processing load (F1413) based on the information "power at power-on suppression" / "power-on suppression time" received in F1411. The processing of F1414 to F1417 is the same as that of F723 to F726. As long as the power supply is greater than the threshold, the processing of F1409 to F1417 is repeated.

[0154] As described above, according to this embodiment, during the negotiation phase, TX sends a "power-on suppression threshold" to RX using ACAP. Then, when TX confirms power delivery during the power transmission phase and the power delivery exceeds the threshold, it sends a "power-on suppression threshold" / "interrogation time" for each NFC tag detection process during the power transmission phase. In this embodiment, unlike the first and second embodiments, since RX does not require control of power delivery (CE) based on its own load, TX sends a "power at power-on suppression" / "interrogation time" without waiting for an interrogation from RX. By making RX respond to power-on suppression performed by TX, NFC tag detection can be reliably performed during the power transmission phase. Therefore, even in cases where noise affecting communication in NFC tag detection is generated as power delivery increases, NFC tag detection processing can be performed appropriately and reliably. That is, in this embodiment, high-output wireless power transmission can be made compatible with NFC tag detection performed during wireless power transmission.

[0155] [Other Embodiments] Other embodiments, not limited to those described in the parts common to the first to third embodiments, will now be described.

[0156] The method described above for confirming the power supplied by the TX side as a criterion for determining whether to enable power supply suppression during NFC tag detection has been described. However, other methods can be used. For example, the power received by the RX using RPP can be used for this determination. That is, when the power received by the RX using RPP is greater than a threshold, the TX can set power supply suppression to the enabled state. Alternatively, TX can determine the threshold based on the GP determined during the negotiation phase. In this case, GP can be used as the threshold, or both GP and the threshold can be used. In the latter case, for example, when GP is set to a value greater than the threshold, this means that power-on suppression is always on during the NFC tag detection processing in the power delivery phase. Primarily, the control unit 301 and the program used to determine the threshold are examples of determining components. Alternatively, the power delivery profile (power profile) determined during the negotiation phase can be used as a criterion for judgment. For example, when a power profile is determined that will be used for the expected high output, it means that power delivery suppression is always on during NFC tag detection processing in the power delivery phase. Alternatively, power supply suppression can be always set to off, utilizing a power profile where the likelihood of an NFC tag entering during the power transfer phase is very low. This is assumed to be based on a profile used for cases where TX and RX are strongly coupled and the likelihood of foreign objects entering is low.

[0157] In the above embodiments, an example of RX adjusting the processing load during power supply suppression in NFC tag detection processing has been described, but this disclosure is not limited thereto. For example, when sufficient power is supplied to the RX's battery 208 and power supply suppression does not cause any problems, the RX may also perform processing without adjusting the processing load. The RX may also perform processing to determine whether to adjust the processing load based on the relationship between the power supply in wireless power transmission and the power consumption on the RX side. For example, if processing with a high load is in progress and the power consumption on the RX side is greater than the power supplied from the TX, the RX may also determine that the processing load has been adjusted.

[0158] In the above embodiments, an example of TX reducing power supply as a form of power supply suppression in NFC tag detection processing has been described, but this disclosure is not limited thereto. For example, power supply may be stopped during NFC tag detection. When power supply stops, the RX side needs to handle the situation carefully. There are concerns that if power supply is stopped when the RX does not have a battery or when the RX has a battery but its state of charge is low, the current state will be lost due to power loss, and the RX will not communicate with the TX due to state mismatch. Therefore, when the RX does not have a battery or when the RX has a battery but its state of charge is low, the RX saves its current state in non-volatile memory and prepares to stop power supply when adjusting the load. After power supply is restored (restarted), the RX can restore the saved information to continue the power transfer phase. During the power supply stoppage, the TX stores information related to the RX state and continues the power transfer phase with the RX after power supply is restored (restarted). The information related to the RX state is the information received by the TX from the RX up to this point in the negotiation or power transfer phase. Primarily, the control unit 201 is an example of a power-on restarting component that is used to restart the powered device based on stored information relating to the state of the powered device. TX can also confirm the presence of RX by issuing a simulated Ping during the power supply stoppage, in order to determine whether RX has moved from the appropriate charging location during the power supply stoppage.

[0159] The TX can variably control the NFC tag detection processing cycle (execution wait time), query time, and / or the time until NFC tag detection (remaining execution time) based on the power supplied. For example, when the power supplied is high, finer NFC tag detection is preferred. To achieve this, the TX can also appropriately change the NFC tag detection processing cycle and the query interval (query time) from the RX to the TX based on the power supplied. For example, an example will be given. Figure 10The processing flow in the TX is illustrated. The processing of "sending until the next NFC tag detection" in S6114 is the processing under the condition that the power supply is greater than the threshold ("No" in S6110). Here, in addition to "sending until the next NFC tag detection", the TX can also change the query time by notifying the RX of the next "query time". In the processing of S5128, the RX obtains the information of "sending until the next NFC tag detection" and the next "query time". Then, the RX can change the query period by setting the timer start in the next S5119 to the obtained query time. The TX can start the timer according to the changed NFC detection period in the NFC timer start in S6128 or S6126. In the third embodiment, the TX can take countermeasures by only changing the period of the NFC timer on the TX side.

[0160] Alternatively, the TX can variably control the NFC tag detection processing cycle (execution wait time), interrogation time, and / or the time until NFC tag detection (execution remainder time) based on the GP determined during the negotiation phase. For example, the TX can determine the NFC tag detection processing cycle based on the GP value and adjust the interrogation interval sent using ACAP accordingly.

[0161] In the above embodiments, the information regarding the "power supply suppression threshold" is sent to the RX during the negotiation phase, but it can also be sent to the RX during the power transmission phase. This also applies to the "interrogation time" in the first and second embodiments. In this case, during the power transmission phase, at least one of the "power supply suppression threshold" and the "interrogation time" must be sent to the RX. Alternatively, one of the "power at power supply suppression" and the "power supply suppression time" can be sent during the negotiation phase, while the other can be sent during the power transmission phase.

[0162] In the above embodiments, TX is in Figure 4 In the illustrated F413, SRQ(ACAP) is sent followed by GRQ(ACAP) (F415). However, the timing of GRQ(ACAP) transmission is not particularly restricted, as long as it occurs after an ACK has been sent in F408 during the negotiation phase. An example of timing is the timing between F412 and F413.

[0163] Some (and in some cases all) of the constituent elements in the foregoing embodiments may be replaced by other constituent elements that can achieve the same function, or may be omitted, and other constituent elements may be added to them. The embodiments are not limited to the WPC standard, but can be applied to various standards.

[0164] The power supply and receiving devices can be, for example, image input devices (such as camera devices (still cameras or video cameras, etc.) or scanners, or image output devices (such as printers, copiers, or projectors). The power supply and receiving devices can be storage devices such as hard disk devices or memory devices, or information processing devices such as personal computers (PCs), smartphones, or tablets.

[0165] The powered device according to this disclosure can be an information terminal device. For example, the information terminal device includes a display unit (shower) that displays information to a user and is supplied with power received from a powered antenna. The power received from the powered antenna is stored in a power storage unit (battery), and power is supplied from the battery to the display unit. In this case, the powered device may include a communication unit that communicates with devices other than the power transmitting device. The communication unit can be compatible with communication standards such as NFC communication or fifth-generation mobile communication systems (5G).

[0166] The power receiving device according to this disclosure can be a vehicle, such as a car. For example, a car acting as a power receiving device can receive power from a charger (power receiving device) via a power transmitting antenna installed in a parking lot. A car acting as a power receiving device can also receive power from a charger (power receiving device) via a power transmitting antenna embedded in the road. The car supplies the received power to a battery. The battery power can be supplied to an engine (motor or electric motor) for driving the wheels, or it can be used to drive sensors for assisting driving or to drive a communication unit for communicating with external devices. That is, in this case, the power receiving device may include, in addition to the wheels, a battery, a motor or sensor driven by the received power, or a communication unit for communicating with devices other than the power receiving device. The power receiving device may include a housing for accommodating a person. For example, sensors may include sensors for measuring distances between vehicles or distances to other obstacles. The communication unit may be compatible with, for example, a Global Positioning System or Global Positioning Satellite (GPS). The communication unit may be compatible with communication standards such as 5G. Bicycles or motorcycles can be used as vehicles.

[0167] The power receiving device according to this disclosure can be a power tool or a household appliance, etc. In addition to a battery, the device may also include a motor driven by the power stored in the battery. The device may include a notification component for informing the battery's charging status, etc. The device may include a communication unit for communicating with other devices besides the power transmitting device. The communication unit can be compatible with communication standards such as NFC or 5G.

[0168] The power supply device according to this disclosure can be an on-board charger for transmitting power in a vehicle, such as an automobile, to a mobile information terminal device corresponding to wireless power transmission, such as a smartphone or tablet. The on-board charger can be installed in any location within the vehicle. For example, it can be installed in the vehicle's console, or in the dashboard, between passenger seats, in the ceiling, or in a door. Preferably, the on-board charger is not installed in a location that would interfere with driving. While the on-board charger is described as an example of a power supply device, such a charger is not limited to installation in a vehicle but can also be installed in transportation machinery such as subway trains, airplanes, or ships. In this case, the charger can be installed between passenger seats, in the ceiling, or in a door.

[0169] Vehicles, such as cars that include onboard chargers, can be used as power transmission devices. In this case, the power transmission device includes wheels and a battery, and supplies battery power to the receiving device via a power transmission circuit unit or a power transmission antenna.

[0170] This disclosure can also be implemented by providing a program for implementing one or more functions of the above embodiments to a system or device via a network or storage medium, and having one or more processors in the computer of the system or device read and execute the program. This disclosure can also be implemented by circuitry (e.g., an ASIC) for implementing one or more functions.

[0171] Although the present disclosure has been described in detail above with reference to exemplary embodiments thereof, the present disclosure is not limited to these embodiments and may be modified in various forms based on the spirit of the present disclosure, which are not excluded from the scope of the present disclosure.

[0172] (Cross-reference to related applications) This application claims priority to Japanese Patent Application 2024-5434, filed January 17, 2024. The contents of that Japanese patent application are incorporated herein by reference.

Claims

1. A power transmission device, comprising: The negotiation component is configured to negotiate with the powered device; A power-transmitting component configured to wirelessly transmit power to the power-receiving device based on the result of the negotiation; The processing unit is configured to perform processing including the detection of near field communication tags, i.e., NFC tags; as well as A communication component configured to send information relating to NFC tag detection to the powered device at least during the negotiation, wherein the NFC tag detection is performed during power supply.

2. The power transmitting device according to claim 1, wherein The processing unit adjusts the power supply from the power supply unit based on information related to the NFC tag detection, and performs the NFC tag detection while the power supply has been adjusted.

3. The power transmitting device according to claim 2, wherein Information related to the NFC tag detection includes information indicating a threshold for the power supply, wherein the threshold is a threshold for causing the processing unit to initiate processing associated with an adjustment of the power supply.

4. The power transmitting device according to claim 3, wherein Information related to the NFC tag detection also includes adjustment power information for indicating the power supplied during adjustment, and duration information for indicating the continuous supply of power using the adjusted power supply during the specified time period. The processing unit adjusts the power supply based on the power adjustment information and the duration information.

5. The power transmission device according to claim 4, wherein, After the supplied power has exceeded the threshold, the communication component sends the power adjustment information and the duration information to the receiving device.

6. The power transmission device according to claim 3, wherein, Information related to the NFC tag detection also includes information indicating an interrogation waiting time until the powered device sends an interrogation to the powered device, and The object of the inquiry is information related to the execution wait time from when the power supply has exceeded the threshold until the processing unit performs the NFC tag detection.

7. The power transmission device according to claim 6, wherein, Information related to the NFC tag detection also includes adjustment power information for indicating the power supplied during adjustment, and duration information for indicating the continuous supply of power using the adjusted power supply during the specified time period. The processing unit adjusts the power supply based on the power adjustment information and the duration information.

8. The power transmission device according to claim 7, wherein, The execution waiting time includes the remaining execution time until the NFC tag detection is performed, and the remaining execution time is set based on the communication component receiving the query.

9. The power transmission device according to claim 8, wherein, Before the execution waiting time has elapsed, the communication component, in response to the query, sends information to the powered device indicating the remaining execution time, and The processing unit adjusts the power supply after the execution waiting time has elapsed.

10. The power transmission device according to claim 9, wherein, The communication component responds to the query before the execution waiting time has elapsed by sending information to the powered device indicating the remaining execution time, and further sends the power adjustment information and the duration information to the powered device based on a further query received from the powered device based on the remaining execution time.

11. The power transmission device according to claim 5, wherein, The processing unit is configured with an execution wait time from when the supplied power exceeds the threshold until the processing unit performs the NFC tag detection, and After the execution waiting time has elapsed, the communication component sends the power adjustment information and the duration information to the powered device.

12. The power transmission device according to claim 8, wherein, The processing unit controls at least one of the execution waiting time, the query waiting time, and the remaining execution time based on the power supply.

13. The power transmission device according to claim 8, wherein, The processing unit controls at least one of the execution wait time, the query wait time, and the remaining execution time based on the guaranteed power determined through the negotiation.

14. The power transmission device according to claim 2, wherein, The processing unit reduces or stops the power supply as an adjustment to the power supply.

15. The power transmission device according to claim 14, wherein, In the event of power supply interruption, the processing unit stores information related to the state of the powered device, performs NFC tag detection, and then restarts power supply based on the stored information related to the state of the powered device.

16. The power transmission device according to claim 2, wherein, Information related to the NFC tag detection includes information on a threshold for indicating the received power of the powered device, wherein the threshold is a threshold used by the processing unit to initiate processing associated with the adjustment of the supplied power.

17. The power transmission device of claim 3, further comprising a determining component configured to determine the threshold based on information from a guaranteed power or power transmission profile determined through the negotiation.

18. A power receiving device, comprising: The negotiation component is configured to negotiate with a power supply device capable of performing processing including the detection of near field communication tags, i.e., NFC tags. A receiving component is configured to wirelessly receive power from the power supply device based on the result of the negotiation; as well as A communication component is configured to receive information relating to NFC tag detection from the power supply device at least during the negotiation, wherein the NFC tag detection is performed during power supply.

19. The power receiving device according to claim 18, wherein, Information related to the NFC tag detection includes information indicating a threshold for power delivery and information indicating an interrogation wait time until the communication component sends an interrogation to the power delivery device, wherein the threshold is a threshold for causing the power delivery device to initiate processing associated with adjustments to the power delivery. The power supply device adjusts the power supply based on information related to the NFC tag detection, and performs NFC tag detection while the power supply has been adjusted. The communication component receives the remaining execution time until the NFC tag detection is performed. The remaining execution time is set and sent by the power supply device after the query waiting time has elapsed.

20. The power receiving device according to claim 19, wherein, The power supply device adjusts the power supply based on adjustment power information indicating the power supply during adjustment and duration information indicating a period of time during which the power supply using the adjusted power supply is continuously performed. The adjustment power information and the duration information are further included in information related to the NFC tag detection. The power receiving device further includes an adjustment component, which is configured to adjust the processing load of the power receiving device based on the adjustment power information and the duration information after the remaining execution time has elapsed.

21. The power receiving device according to claim 20, wherein, The power supply device, based on further receiving an inquiry from the power receiving device after the remaining execution time has elapsed, further sends the adjusted power information and the duration information to the power receiving device. The adjustment component adjusts the processing load based on the adjustment power information and the duration information sent from the power supply device.

22. The power receiving device according to claim 18, wherein, Information related to the NFC tag detection includes information indicating a threshold for power supply, power adjustment information indicating power supply adjustment during adjustment, and duration information indicating a time period during which the threshold is a threshold for initiating processing associated with the power supply adjustment by the power supply device, and during which power supply using the adjusted power supply is continuously performed. The power supply device is configured with an execution waiting time from when the supplied power exceeds the threshold until the power supply device performs the NFC tag detection. After the execution waiting time has elapsed, it sends the adjusted power information and the duration information to the receiving device, adjusts the supplied power based on the adjusted power information and the duration information, and performs the NFC tag detection while the supplied power has been adjusted. The power receiving device further includes an adjustment component configured to adjust the processing load of the power receiving device based on the adjustment power information and the duration information sent from the power transmitting device.

23. The power receiving device according to claim 18, wherein, The power supply device reduces or stops the power supply as an adjustment to the power supply, and The power receiving device further includes a restarting component, which is configured to store information related to the state of the power receiving device when the power supply stops, and to restart power receiving based on the stored information related to the state of the power receiving device when the power supply is restarted after the NFC tag detection has been performed.

24. A method performed by a power transmission device, the method comprising the following steps: Negotiate with the power receiving device; Based on the result of the negotiation, power is wirelessly transmitted to the receiving device; Processing includes the detection of Near Field Communication (NFC) tags; as well as Information relating to NFC tag detection is sent to the powered device during at least the aforementioned negotiation, wherein the NFC tag detection is performed during power supply.

25. A method performed by a power receiving device, the method comprising the following steps: Negotiate with the power supply device, which is capable of processing including the detection of near field communication tags, i.e., NFC tags; Based on the result of the negotiation, power is wirelessly received from the power transmission device; as well as Information relating to NFC tag detection is received from the power supply device during at least the aforementioned negotiation, wherein the NFC tag detection is performed during power supply.

26. A program for causing a computer to perform the method according to claim 24 or 25.

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