Power reception device, power transmission device, method of controlling power reception device and program

Abstract

To provide a technology for executing appropriate processing when tag data is read from an NFC tag.SOLUTION: A power reception device 101 receives power wirelessly from a power transmission device 102. The power reception device detects an NFC (Near Field Communication) tag (S502, S516) and reads one or more pieces of tag data from the detected NFC tag. Then, the power reception device switches a processing method regarding one or more pieces of tag data and executes processing, depending on whether the tag data was read when the power reception device was in a state where it was able to receive power from the power transmission device (after S503 or after S517).SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a technology for wireless power transmission. [Background technology]

[0002] In recent years, technological development of wireless power transmission systems has been widely carried out. Wireless power transmission system technologies generally comply with the standards (WPC standards) established by the standardization organization Wireless Power Consortium (WPC) as wireless charging standards.

[0003] On the other hand, the NFC standard is known as a standard for short-distance wireless communication. NFC is an abbreviation for Near Field Communication. In the NFC standard, polling refers to transmitting a carrier wave and modulating the carrier wave to send a message for detecting a device to communicate with. Polling is transmitted by a device having a function called a reader / writer of the NFC standard. An NFC tag refers to a device having a function of receiving polling transmitted by a reader / writer and responding to the polling by applying load modulation to the carrier wave transmitted by the reader / writer.

[0004] Information exchanged under the NFC standard follows a data format called NDEF (NFC Data Exchange Format). Multiple pieces of NDEF information can be set on a single tag, and a reading device can read multiple pieces of NDEF information set on an NFC tag from the NFC tag in one NFC communication. How the read NDEF information is processed is up to the device, and there are devices that only process the first NDEF information of multiple pieces of NDEF information that are read.

[0005] Patent Document 1 discloses a technology in which a power receiving device equipped with a WPC function and an NFC function disables the NFC function when it detects a power transmitting device during contactless charging, allowing the power transmitting device to transmit high-output power without damaging the NFC tag.

[0006] Patent Document 2 also discloses a technology in which, in a power receiving device having an NFC tag detection function, if a power transmitting device does not have the NFC tag detection function, the power receiving device detects the NFC tag and notifies the power transmitting device of the detection result. When the power receiving device detects an NFC tag, the power transmitting device stops transmitting power or transmits low power with the maximum transmission power limited to a predetermined value or less in order to reduce damage to the NFC tag. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2020-089134 A [Patent Document 2] JP 2020-182355 A Summary of the Invention [Problem to be solved by the invention]

[0008] When a power receiving device reads tag data from an NFC tag of a power transmitting device or an NFC tag placed around the power transmitting device, it is desirable to execute appropriate processing to protect the NFC tag. On the other hand, there may be cases where the power receiving device reads tag data from an NFC tag in a state where the power receiving device does not receive power from the power transmitting device or is unable to receive power, and in such cases, there is room for consideration as to how the power receiving device, etc., should handle the tag data.

[0009] The present disclosure provides a technique that can perform appropriate processing when tag data is read from an NFC tag. [Means for solving the problem]

[0010] A power receiving device according to one embodiment of the present disclosure is a power receiving device that wirelessly receives power from a power transmitting device, and is characterized in having a detection means for detecting an NFC (Near Field Communication) tag, a reading means for reading one or more tag data from the detected NFC tag, and a processing means for switching a processing method for the one or more tag data and executing processing depending on whether the tag data is read by the reading means when the power receiving device is in a state where it is capable of receiving power from the power transmitting device. Effect of the Invention

[0011] According to the present disclosure, when tag data is read from an NFC tag, appropriate processing can be performed. [Brief description of the drawings]

[0012] [Figure 1] 1 is a diagram illustrating an example of the configuration of a wireless power transmission system according to a first embodiment. [Diagram 2] 1 is a block diagram showing an example of the configuration of a power receiving device according to an embodiment; [Diagram 3] 1 is a block diagram showing an example of a configuration of a power transmitting device according to an embodiment; [Figure 4] 10 is a flowchart illustrating a process performed by a power receiving device in one embodiment. [Diagram 5] 4 is a part of a flowchart showing a process of determining a required power value, which is mainly performed by a power receiving device in the first embodiment. [Figure 6] 6 is a flowchart continuing from FIG. 5. [Figure 7] 4 is a sequence diagram showing processing performed by a power receiving device and a power transmitting device in the first embodiment. FIG. [Figure 8] FIG. 1 is a diagram showing NDEF information stored in an NFC tag. [Figure 9] FIG. 11 is a diagram illustrating an example of the configuration of a wireless power transmission system according to a second embodiment. [Figure 10] 13 is a flowchart showing a process of detecting a plurality of NFC tags in the second embodiment. [Figure 11] 11 is a part of a flowchart showing a process of determining a required power value, which is mainly performed by a power receiving device in a second embodiment. [Figure 12] 12 is a flowchart continuing from FIG. 11. [Figure 13] FIG. 11 is a sequence diagram showing processes performed by a power receiving device and a power transmitting device in the second embodiment. [Figure 14] FIG. 13 shows NDEF information stored in another NFC tag. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Note that not all of the features in the embodiments of the present disclosure are essential to the present disclosure, and the features may be combined in any manner. In the drawings, the same reference symbols are used for the same or similar configurations to avoid redundant description.

[0014] [First embodiment] <System configuration> 1 is a diagram showing an example of the configuration of a wireless power transmission system according to an embodiment. The configuration of the wireless power transmission system according to the present embodiment is shown. In one example, the wireless power transmission system includes a power receiving device 101 and a power transmitting device 102. In the following, for the sake of simplicity, the power transmitting device 102 may be referred to as TX and the power receiving device 101 may be referred to as RX.

[0015] The RX is, for example, an electronic device that receives power from the TX and charges a built-in battery. The RX also includes a WPC function that complies with the WPC (Wireless Power Consortium) standard, and is compatible with the device authentication protocol of the standard. The RX also has an NFC (Near Field Communication) function, and can operate in, for example, a card emulation mode using the function to enable electronic money payment, etc. The RX also has an NFC function that can read an NFC tag (another device) 103 by performing NFC communication by operating in a reader / writer mode.

[0016] The TX is, for example, an electronic device that wirelessly transmits power to the RX placed on the device itself. The TX wirelessly transmits power to the RX via a power transmission coil. The TX also has an NFC function that enables the TX to perform NFC communication and read the NFC tag 103 by operating in a reader / writer mode. The TX can detect an NFC device by using the function, and can stop or limit the power transmission process to protect the NFC tag 103, for example. The NFC tag 103 is an example of a device that operates without a battery and realizes short-distance wireless communication. As a more specific example, the NFC tag 103 refers to an NFC / RFID (Radio frequency identifier) ​​tag capable of NFC communication, an NFC communication device operating in a card emulation mode, or the like.

[0017] In general, there may be a power transmitting device having an NFC tag in which NDEF (NFC Data Exchange Format) information corresponding to additional information or services is set for the purpose of providing additional information or services to a power receiving device. When an NFC tag that does not operate on a battery is exposed to a high-power electromagnetic field due to power transmission processing, the antenna element of the NFC tag may be damaged. The NFC tag is configured to be less susceptible to damage if power is transmitted at a certain output or less, and the NDEF information may be set to indicate that the NFC tag is less susceptible to damage if power is transmitted at a certain output or less. This allows the power receiving device to perform processing such as displaying a UI for utilizing additional information or services, and to have the power transmitting device perform appropriate power transmission processing. When the power receiving device reads multiple pieces of NDEF information, for example, it is required to perform appropriate processing for the NDEF information.

[0018] The NFC tag 103 is, for example, built into the TX. When the NFC tag 103 is an external device to the TX, the NFC tag 103 can be attached to the surface of the TX or placed around the TX.

[0019] In the following, a smartphone will be described as an example of an RX, and a charger will be described as an example of a TX, but the present disclosure is not limited thereto. The RX and TX may be built into other devices (cameras, smartphones, tablet PCs, laptops, automobiles, robots, medical equipment, printers) and configured to supply power to those devices.

[0020] This system performs wireless power transmission using an electromagnetic induction method for contactless charging based on the WPC standard. That is, RX and TX perform wireless power transmission for contactless charging based on the WPC standard between the receiving coil of RX and the transmitting coil of TX. Note that the wireless power transmission method (contactless power transmission method) is not limited to the method defined by the WPC standard, and may be a method using other electromagnetic induction method, magnetic field resonance method, electric field resonance method, microwave method, laser method, etc. Also, in this embodiment, wireless power transmission is used for contactless charging, but wireless power transmission may be performed for purposes other than contactless charging.

[0021] In the WPC standard, the amount of power guaranteed when RX receives power from TX is specified by a value called Guaranteed Load Power (hereafter referred to as "GP"). GP indicates the power value guaranteed to be output to the load of RX, such as a charging circuit, even if the positional relationship between RX and TX changes and the power transmission efficiency between the receiving coil and the transmitting coil decreases, i.e., the load power value of RX. GP can also be a load power level agreed upon by negotiation between TX and RX. For example, if GP is 15 watts, TX transmits power by controlling so that it can output 15 watts to the load in RX, even if the positional relationship between the receiving coil and the transmitting coil changes and the power transmission efficiency decreases.

[0022] <Configuration of power receiving device> 2 shows an example of the configuration of the RX according to this embodiment. The RX includes a control unit 201, an NFC communication unit 202, a WPC communication unit 203, a power receiving coil 204, a power receiving 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.

[0023] The control unit 201 controls the entire smartphone. An example of the control unit 201 is configured with a CPU (Central Processing Unit) or an MPU (Microprocessor Unit). The control unit 201 can measure time using a timer 212. The control unit 201 performs control by executing a control program stored in, for example, a memory 211. The control unit 201 is configured to include one or more processors, such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit).

[0024] The control unit 201 may be configured with hardware dedicated to a specific process, such as an application specific integrated circuit (ASIC). Alternatively, the control unit 201 may be configured to include an array circuit, such as a field programmable gate array (FPGA) compiled to execute a predetermined process. The control unit 201 stores information to be stored during execution of various processes in the memory 211.

[0025] In this embodiment, the control unit 201 is shown as one component, but is not limited thereto. For example, a WPC control unit that controls processing related to power reception with a power transmitting device in a power receiving device may be configured to be separated from the control unit 201. Alternatively, an NFC control unit that controls processing related to NFC communication may be configured to be separated from the control unit 201. Alternatively, a WPC control unit and an NFC control unit may be configured to be separated from the control unit 201. When the control unit 201 is configured to be separated into a plurality of units, the respective control units are connected to each other via a communication interface and are capable of data communication. The communication interface may be any interface that realizes data communication, such as I2C, GPIO, etc.

[0026] The NFC communication unit 202 is a hardware module that realizes the NFC function. Specifically, it realizes a card emulation mode that substitutes for the role of a contactless IC card, a reader / writer mode for reading the NFC tag 103, and a P2P mode for directly exchanging messages between NFC devices. For example, the card emulation mode is used to enable electronic money payment. At least the NFC communication unit 202 functions as a detection unit that detects the NFC tag 103 and as a reading unit that reads one or more tag data from the detected NFC tag.

[0027] As described below, the control unit 201 mainly functions as a processing means that switches between processing methods for one or more tag data and executes processing depending on whether the tag data is read by the reading means when the power receiving device is in a state where it can receive power from the power transmitting device.

[0028] The WPC communication unit 203 performs wireless power transmission communication based on the WPC standard with the TX communication unit 306. The WPC communication unit 203 demodulates the electromagnetic waves input from the power receiving coil 204 to acquire information transmitted from the TX, and performs load modulation of the electromagnetic waves to superimpose information to be transmitted to the TX on the electromagnetic waves, thereby performing communication with the TX.

[0029] The power receiving unit 205 receives AC power (AC voltage and AC current) generated by electromagnetic induction based on electromagnetic waves radiated from the power transmitting coil of TX via the power receiving coil 204. The power receiving unit 205 converts the AC power into DC or AC power of a predetermined frequency and outputs it to the detection unit 206.

[0030] The detection unit 206 detects that the RX is placed on the TX based on the WPC standard. The detection unit 206 detects, for example, at least one of the voltage value and the current value of the power receiving coil 204 when the power receiving unit 205 receives a Digital Ping of the WPC standard via the power receiving coil 204. The detection unit 206 can determine that the RX is placed on the TX when, for example, the voltage value is below a predetermined voltage threshold or the current value exceeds a predetermined current threshold.

[0031] In this embodiment, placing RX on TX means that RX is in a state where it can receive power from TX. For example, TX has a charging stand, and placing RX on the stand puts RX in a state where it can receive power. RX is not in a state where it can receive power when it is not placed on the stand. Here, even if the power receiving device is placed on the power transmitting device, it may not necessarily be in a state where it can receive power. For example, this may be the case when a cover, case, or other member that blocks or attenuates electromagnetic waves is attached to the power receiving device, or when an unintended member that blocks or attenuates electromagnetic waves is present between the power transmitting device and the power receiving device. In other words, the "state where the power receiving device is placed on the power transmitting device" described in the flowchart of this embodiment is merely one example of a state where the power receiving device can receive power from the power transmitting device. In addition, the state in which the power receiving device is capable of receiving power is not limited to the state in which the power receiving device is placed on the power transmitting device. For example, the state in which the power receiving device is capable of receiving power may be a state in which the power receiving device and the power transmitting device are in contact or close proximity to each other through mechanical engagement, or a state in which the power receiving device is in contact with the power transmitting device through magnetic force. In this embodiment, the following description will be given assuming that the state in which the RX is placed on the TX is a typical example of a state in which the RX is capable of receiving power.

[0032] The charging unit 207 charges the battery 208 with power supplied from the power receiving unit 205. The charging unit 207 also starts or stops charging the battery 208 based on the control of the control unit 201, and further adjusts the power used to charge the battery 208 based on the charging state of the battery 208. When the power used by the charging unit 207 changes, the power supplied from the power receiving unit 205, i.e., the received power in RX, also changes accordingly. The charging unit 207 shown here is a load in RX.

[0033] The battery 208 supplies the entire RX with power required for the control of each part of the RX by the control unit 201 and for power reception and communication. The battery 208 also stores the power received via the power receiving coil 204.

[0034] The notification unit 209 notifies the user of information by any method such as visually, audibly, or tactilely. For example, the notification unit 209 notifies the user of the charging state of RX and the state related to power transmission of the wireless power transmission system including RX and TX as shown in Fig. 1. The notification unit 209 includes, for example, a liquid crystal display, an LED, a speaker, a vibration generating circuit, and other notification devices.

[0035] The operation unit 210 has a reception function of receiving an operation for RX from a user. The operation unit 210 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, or other input devices. Note that a device in which the notification unit 209 and the operation unit 210 are integrated, such as a touch panel, may be used.

[0036] As described above, the memory 211 stores various information such as identification information and device configuration information, control programs, etc. The memory 211 may store information obtained by a functional unit other than the control unit 201.

[0037] The timer 212 measures time using, for example, a count-up timer that measures the elapsed time from the time it was started, or a count-down timer that counts down from a set time.

[0038] <Configuration of power transmission device> 3 shows an example of the 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, a power transmission coil 305, a communication unit 306, a notification unit 307, an operation unit 308, a memory 309, and a timer 310.

[0039] The control unit 301 controls the entire TX by executing a control program stored in the memory 309, for example. That is, the control unit 301 controls each functional unit shown in FIG. 3. The control unit 301 also performs control related to power transmission control in the TX. The control unit 301 also performs control related to the NFC function in the TX. Furthermore, the control unit 301 may perform control for executing applications other than wireless power transmission. The control unit 301 includes one or more processors, such as a CPU or MPU. The control unit 301 may be configured with one processor, or, as described with reference to FIG. 2, a main control unit for controlling the entire TX and a sub-control unit for controlling power transmission processing and NFC communication may each be realized by separate processors.

[0040] The control unit 301 may be configured to include hardware dedicated to a specific process, such as an application specific integrated circuit (ASIC), or an array circuit, such as an FPGA, compiled to execute a predetermined process. The control unit 301 stores information to be stored during execution of various processes in the memory 309. The control unit 301 may also measure time using a timer 310.

[0041] The power supply unit 302 supplies the entire TX with power required for the control of the TX by the control unit 301 and for power transmission and communication. The power supply unit 302 is, for example, a commercial power source or a battery. The battery stores power supplied from the commercial power source.

[0042] The power transmitting unit 303 converts the DC or AC power input from the power supply unit 302 into AC frequency power in a frequency band used for wireless power transmission, and generates electromagnetic waves for receiving power at RX by inputting the AC frequency power to the power transmitting coil 305. The frequency of the AC power generated by the power transmitting unit 303 is, for example, about several hundred kHz (for example, 110 kHz to 205 kHz). Based on an instruction from the control unit 301, the power transmitting unit 303 inputs the AC frequency power to the power transmitting coil 305 so that the power transmitting coil 305 outputs electromagnetic waves for transmitting power to RX.

[0043] Moreover, the power transmitting unit 303 controls the intensity of the electromagnetic waves to be output by adjusting the voltage (power transmission voltage) or current (power transmission current), or both, input to the power transmitting coil 305. Increasing the power transmission voltage or power transmission current increases the intensity of the electromagnetic waves, and decreasing the power transmission voltage or power transmission current decreases the intensity of the electromagnetic waves. Furthermore, the power transmitting unit 303 performs output control of the AC frequency power so that the power transmission from the power transmitting coil 305 is started or stopped based on an instruction from the control unit 301. Furthermore, the power transmitting unit 303 notifies the control unit 301 of the current power transmission, so that the control unit 301 can know the power transmission at any timing. Note that the measurement of the power transmission and the notification to the control unit 301 may be configured to be performed by a unit other than the power transmitting unit 303.

[0044] 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 an object is placed on the interface surface of the TX. For example, the detection unit 304 detects at least one of the voltage value and the current value of the power transmitting coil 305 when the power transmitting unit 303 transmits an Analog Ping of the WPC standard via the power transmitting coil 305.

[0045] The detection unit 304 may detect a change in impedance. The detection unit 304 may determine that an object is placed on the TX when the voltage falls below a predetermined voltage value or when the current value exceeds a predetermined current value. Whether the object is a power receiving device or another foreign object is determined based on the presence or absence of a predetermined response to the Digital Ping subsequently transmitted by the communication unit 306. That is, when the TX receives a predetermined response, the object is determined to be a power receiving device, and otherwise, the object is determined to be an object other than a power receiving device.

[0046] The communication unit 306 performs control communication with the RX based on the WPC standard as described above. The communication unit 306 modulates the electromagnetic waves output from the power transmitting coil 305 and transmits information to the RX to perform communication. The communication unit 306 also demodulates the electromagnetic waves output from the power transmitting coil 305 and modulated by the RX to obtain information transmitted by the RX. That is, the communication performed by the communication unit 306 is superimposed on the electromagnetic waves transmitted from the power transmitting coil 305.

[0047] Furthermore, the communication unit 306 performs NFC communication and detects the NFC tag 103 of the device to which power is transmitted. Note that the communication unit 306 may be realized by a module for performing control communication based on the WPC standard and a module for performing NFC communication, both of which may be realized by a single piece of hardware, or each of which may be realized by separate hardware.

[0048] The notification unit 307 notifies the user of information by any method such as visually, audibly, or tactilely. The notification unit 307 notifies the user of, for example, the charging state of TX, or information indicating the state of power transmission in the wireless power transmission system including TX and RX as shown in Fig. 1. The notification unit 307 includes, for example, a liquid crystal display, an LED, a speaker, a vibration generating circuit, or other notification devices.

[0049] The operation unit 308 has a reception function of receiving an operation for 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, or other input devices. Note that a device in which the notification unit 307 and the operation unit 308 are integrated, such as a touch panel, may be used.

[0050] The memory 309 stores various information such as identification information and capability information, control programs, etc. The capability information includes information indicating whether the device has a high-precision foreign object detection processing capability. The memory 309 may store information obtained by a functional unit other than the control unit 301.

[0051] The timer 310 measures time using, for example, a count-up timer that measures the elapsed time from the time it was started, or a count-down timer that counts down from a set time.

[0052] <Processing in the power receiving device> Fig. 4 is a flowchart showing an example of the flow of processing executed by the RX. This processing can be realized, for example, by the control unit 201 of the RX executing a program read from the memory 211. At least a part of the following procedure may be realized by hardware. In this case, the hardware can be realized, for example, by using a predetermined compiler to automatically generate a dedicated circuit using a gate array circuit such as an FPGA from a program for realizing each processing step. The same applies to the processing shown in Figs. 5 to 7 and Figs. 10 to 12 described later.

[0053] This process may be executed in response to a user of RX inputting a start instruction for a contactless charging application in response to RX being started by power supply from the battery 208 or TX in response to the power supply of RX being turned on. This process may also be started by another trigger.

[0054] In S401, after starting the process, the RX executes the process defined as the Ping phase of the WPC standard and waits for its own device to be placed on the TX. The RX detects that it has been placed on the TX, for example, by detecting a Digital Ping from the TX. When the RX detects that its own device has been placed on the TX, in S402 it transmits the identification information and capability information of the RX to the TX by communication in the Configuration phase defined in the WPC standard.

[0055] Here, the identification information of the RX includes a Manufacturer Code and a Basic Device ID. The capability information of the RX includes the following information. - Information that can identify the version of the WPC standard that is supported Maximum Power Value (or Reference Power) is a value that specifies the maximum power that the RX can supply to the load. -Information indicating whether or not the device has the WPC standard negotiation function

[0056] However, these pieces of information are merely examples, and the identification information and capability information of the RX may be replaced by other information or may further include other information. For example, the identification information may be any other identification information capable of identifying an individual RX, such as a Wireless Power ID. In addition, the RX may transmit the identification information and capability information by a method other than the communication in the configuration phase of the WPC standard.

[0057] After transmitting the identification information and capability information, the RX starts communication in the negotiation phase defined by the WPC standard. After starting communication in the negotiation phase, the RX acquires NFC tag detection information from the TX in S403. Here, the NFC tag detection information may include information such as whether the TX has an NFC tag detection function, whether the NFC tag detection process has been executed, and whether an NFC tag has been detected as a result of the NFC tag detection process.

[0058] After acquiring the NFC tag detection information, in S404, the RX judges whether or not to execute the NFC tag detection process. Here, the judgment of whether or not to execute the NFC tag detection process is made based on the NFC tag detection information acquired from the TX. For example, when the TX does not have an NFC tag detection function, or when the TX has an NFC tag detection function but has not yet performed NFC tag detection, the RX may perform the NFC tag detection process. In addition, without being limited to this, when the TX detects an NFC tag as a result of performing NFC tag detection, the RX may also perform the NFC tag detection process to reconfirm whether or not an NFC tag exists. This makes it possible to detect the NFC tag more reliably.

[0059] If the RX determines to execute the NFC tag detection process (YES in S404), the process proceeds to S405. On the other hand, if the RX determines not to execute the NFC tag detection process (NO in S404), the process proceeds to S412. In S405, the RX transmits a pause request to the TX, and the process proceeds to S406. In S406, the RX executes the NFC tag detection process, and the process proceeds to S407. Here, the NFC tag detection process can be executed in order for each tag type of Type-A / Type-B / Type-F by a reader / writer function conforming to the NFC standard, but is not limited to this.

[0060] When the RX executes the NFC tag detection process, in S407, it determines whether or not an NFC tag has been detected in the NFC tag detection process. Here, the determination of whether or not an NFC tag has been detected can be made based on whether or not a predetermined communication has been performed with the NFC tag by the reader / writer function, or whether or not data (tag data) stored in the NFC tag has been read. The data stored in the NFC tag can be data recorded in the NDEF format defined in the NFC standard. The data stored in the NFC tag can be data in a format that can be recognized by the RX as predetermined data, such as raw data, but is not limited to this.

[0061] When RX determines that an NFC tag has been detected (YES in S407), it advances the process to S408. On the other hand, when RX determines that an NFC tag has not been detected (NO in S407), it advances the process to S410. In S408, RX determines whether or not the detected NFC tag is an NFC tag for which power transmission is permitted. Whether or not the NFC tag is an NFC tag for which power transmission is permitted can be determined based on whether or not the tag data read from the NFC tag contains power transmission permitted tag data indicating that power transmission is permitted. If the power transmission permitted tag data is contained, the NFC tag is an NFC tag for which power transmission is permitted. The format of the data indicating that the NFC tag is an NFC tag for which power transmission is permitted can be, but is not limited to, a value or a character string, etc.

[0062] When the RX determines that the detected NFC tag is an NFC tag that is permitted to transmit power (YES in S408), the process proceeds to S409. On the other hand, when the RX determines that the detected NFC tag is not an NFC tag that is permitted to transmit power (NO in S408), the RX transmits an End Power Transfer (EPT) packet of the WPC standard to the TX and ends the process.

[0063] In this embodiment, if the detected NFC tag is not an NFC tag that is permitted to transmit power, the process is immediately terminated, but it does not have to be terminated. In this case, by setting the required power value (described later) to the limited power value, it becomes possible to continue transmitting and receiving power while preventing damage and heat generation of the NFC tag, and a safer and more efficient wireless power transmission system can be realized.

[0064] In S409, RX stores predetermined information included in the data stored in the NFC tag permitted for power transmission, and proceeds to S410. Here, the predetermined information may mainly be a power value that the NFC tag permits for power transmission. The power value that permits power transmission (hereinafter, permitted power value) may be a power value that indicates the tolerance of the NFC tag with respect to the transmission power of TX or the receiving power of RX. Specifically, the power value that indicates the tolerance of NFC may be a power value that corresponds to the required power value of Negotiable Load Power, which will be described later, or Guaranteed Load Power, which will be described later. The permitted power value is one of the pieces of information included in the power transmission permitted tag data.

[0065] In addition to the allowable power value, the predetermined information may include the version of the Qi standard in the WPC standard, information on which version of NFC the NFC tag supports, and the version of the protection function, etc. Information on which version of NFC the NFC tag supports may include, for example, the version of the NFC-related standard established by the NFC Forum, an NFC standardization organization, and Type-A / B / F information.

[0066] Next, in S410, the process defined as the Ping phase of the WPC standard is executed again, and the device waits for its own device to be placed on the TX. When the RX detects that its own device has been placed on the TX, in S411, the RX transmits identification information and capability information to the TX by communication in the Configuration phase defined in the WPC standard, and proceeds to S412. In S412, the RX executes a process of determining a required power value. The process of determining a required power value will be described later.

[0067] In S413, RX transmits the requested power value (requested value of transmission power) determined in S412 to TX, and determines the value of GP between RX and TX. After determining GP, RX transmits information on a predetermined received power value to TX in order for TX to derive the relationship between the transmitted power and the received power in a state without a foreign object in S414. Here, the information on the predetermined received power value includes the received power value in a light load state / Light Load and the received power value in a maximum load / Connected Load state. After transmitting the information on the received power value, RX starts receiving power by communication in the Power Transfer phase defined by the WPC standard in S415. After that, if an error occurs or if the battery is fully charged, RX transmits an EPT packet of the WPC standard. This stops the power transmission from TX, and the series of processes for contactless charging is completed.

[0068] 5 and 6 are flowcharts mainly showing the process of determining the required power value executed by the RX in S412. Also, Fig. 5 and 6 show an example in which the RX switches the processing method for tag data (here, NDEF information) read from the NFC tag depending on whether the RX is placed on the TX or not, and executes the process. The required power value is power information to be transmitted to the TX in the negotiation with the TX in the negotiation phase.

[0069] At the start of processing, the RX judges whether or not it is placed on the TX (S501). Whether or not the RX is placed on the TX can be judged by whether or not S401 has been passed. When the RX judges that it is placed on the TX (YES in S501), it proceeds to S502 as processing related to the NDEF information, including the processing for determining the required power value in wireless power transmission. On the other hand, when the RX judges that it is not placed on the TX (NO in S501), it proceeds to S516 as processing for the NDEF information not related to wireless power transmission. That is, the RX executes processing by switching one or more processing methods related to tag data depending on whether or not the tag data was read while the RX was placed on the TX.

[0070] Processing related to tag data refers to the following processing performed by RX: [1] Processing to check the presence or absence of specific tag data (e.g., power transmission permitted tag data); [2] Processing related to power transmission using tag data, and [3] Processing based on the information content of tag data, etc. The processing method means which processing (one or more) of [1], [2], and [3] is to be executed (or not executed), and which tag data (one or more) of the multiple tag data is to be processed for [3]. The processing method may also include the meaning of the order in which the three processings [1], [2], and [3] are to be processed.

[0071] In S502, RX determines whether or not it has executed the NFC tag detection process. S502 means the process of S404. If RX has executed the NFC tag detection process (YES in S502), the process proceeds to S503. On the other hand, if RX has not executed the NFC tag detection process (NO in S502), the process proceeds to S510.

[0072] In S503, the RX determines whether or not an NFC tag has been detected in the NFC tag detection process of S406. If the RX determines that an NFC tag has been detected (YES in S503), the RX advances the process to S504. On the other hand, if the RX determines that an NFC tag has not been detected (NO in S503), the RX advances the process to S510.

[0073] In S504, RX determines whether or not reading from the NFC tag 103 was successful. If RX determines that reading was successful (YES in S504), it proceeds to S505. On the other hand, if RX determines that reading was not successful (NO in S504), it has confirmed the presence of the NFC tag but cannot determine whether or not it is a tag that allows power transmission, so it prioritizes protection of the NFC tag and proceeds to S509.

[0074] In S505, the RX checks the NDEF information (for example, all the NDEF information in this case) read from the NFC tag 103. Fig. 8 is a diagram showing an example of the NDEF information (plural pieces of information). In this embodiment, S505 means analyzing the NDEF information 701 to 703 shown in Fig. 8. In this embodiment, the NFC tag 103 is assumed to be an NFC tag implemented by the provider of the TX, and has three pieces of NDEF information as an example.

[0075] NDEF information 701 is URL information, and may be, for example, a URL related to a service to be provided in conjunction with TX. NDEF information 702 may be information related to TX, information on the device type (for example, "TX", i.e., information indicating that it is a power transmitting device), manufacturer information, serial number, and the like. NDEF information 703 is information permitting power transmission, that is, power transmission permission tag data, and may be, for example, the version of wireless power transmission and the permitted power value (e.g., 10 W). The NDEF information is not limited to that shown in FIG. 8, and various information may be set depending on the purpose of the TX provider.

[0076] In this embodiment, the first (initial) NDEF information is on the left, the second NDEF information is in the center, and the third NDEF information is on the right. The RX reads the NDEF information in order from the left. When the NDEF information is stored in the NFC tag, it may be stored linked to an ID or number that identifies the NDEF information. In this case, the RX may read the NDEF information in ID or number order.

[0077] In S506, RX determines whether or not the detected NFC tag is an NFC tag that is permitted for power transmission. That is, in S506, RX checks whether or not there is NDEF information 703. This process is the above-mentioned [1] process of checking whether or not there is specific tag data (e.g., power transmission permitted tag data). Moreover, the processes of S506 to S513 are the above-mentioned [2] process related to power transmission using tag data.

[0078] When the RX determines that the detected NFC tag is an NFC tag permitted for power transmission (has NDEF information 703) (YES in S506), the process proceeds to S507. On the other hand, when the RX determines that the detected NFC tag is not an NFC tag permitted for power transmission (has no NDEF information 703) (NO in S506), the RX determines the limit power value as the required power value (S509) and ends the required power value determination process. The limit power value is a value equal to or less than a sufficiently small predetermined value that is unlikely to cause damage or heat generation of the NFC tag even if the power transmission process is continued. It can be, for example, 5 watts or less, but is not limited to this.

[0079] In S507, RX determines whether the allowable power value is smaller than the transmittable power value. The transmittable power value is the maximum power value that TX can transmit at the current time, and may be the Negotiable Load Power of the WPC standard. If the allowable power value is smaller than the transmittable power value (YES in S507), RX proceeds to S508. On the other hand, if the allowable power value is equal to or larger than the transmittable power value (NO in S507), RX proceeds to S510.

[0080] In S508, the RX judges whether the allowable power value is smaller than the receivable power value. The receivable power value is the maximum power value that the RX can receive at the relevant time, and can be calculated based on the operation state of the RX. The maximum receivable power value can be the Maximum Power Value (or Reference Power). In this case, the control unit 201 functions as a calculation means. The operation state of the RX can be determined, for example, by the load, temperature, coupling coefficient of the transmitting and receiving coils, etc., but is not limited thereto. If the allowable power value is smaller than the receivable power value (YES in S508), the RX determines the allowable power value as the requested power value (S511) and ends the process of determining the requested power value. On the other hand, if the allowable power value is equal to or larger than the receivable power value, the RX advances the process to S510.

[0081] In S510, RX determines whether the receivable power value is equal to or less than the transmittable power value. If the receivable power value is equal to or less than the transmittable power value (YES in S510), RX determines the receivable power value as the requested power value (S512) and ends the process of determining the requested power value. On the other hand, if the receivable power value is greater than the transmittable power value (NO in S510), RX determines the transmittable power value as the requested power value (S513) and ends the process of determining the requested power value.

[0082] In S514, RX determines whether or not NDEF information other than NDEF information indicating that power transmission is permitted (e.g., NDEF information 703) is present among the NDEF information confirmed in S505, that is, whether or not unprocessed (unsupported) NDEF information is present. If RX determines that NDEF information other than NDEF information permitting power transmission is present (YES in S514), it proceeds to S515. On the other hand, if RX determines that NDEF information other than NDEF information permitting power transmission is not present (NO in S514), it ends the process.

[0083] In S515, RX executes processing for the first NDEF information other than the NDEF information that permits power transmission. Taking the NDEF information in FIG. 8 as an example, this processing corresponds to processing NDEF information 701. In this example, RX displays a UI for accessing a URL for a service provided together with TX on a display unit (not shown) of RX. The processing of S515 is processing based on the information content of the tag data described above [3].

[0084] Although S514 is connected not only from S511 and 509 but also from S512 and 513, the route of S512 and 513 is a route with a NO judgment at S503. Therefore, when taking the route with a NO judgment at S503, S514 will inevitably be a NO judgment, and the process will end as it is.

[0085] If the result of S501 is NO, the process is that the RX is not placed on the TX. In this case, since the RX has not passed through S406, the process of detecting the NFC tag is first performed in S516. This process is the same as the process of S406.

[0086] In S517, RX determines whether or not an NFC tag has been detected in the NFC tag detection process. This process is the same as the process of S407. If RX determines that an NFC tag has been detected (YES in S517), it proceeds to S518. On the other hand, if RX determines that an NFC tag has not been detected (NO in S517), it ends the process. Note that after S517 and before S518, a determination similar to S504 is made, but this is omitted here. If the determination is NO, RX ends the process.

[0087] In S518, RX executes processing related to, for example, the first NDEF information. Taking the NDEF information in Fig. 8 as an example, the processing target is NDEF information 701. In this case, RX displays a UI for accessing a URL to a service provided together with TX on a display unit (not shown) of RX. Note that since the processing from S516 onwards is not related to the power transmission processing, even if RX reads NDEF information 703 for the first time in S518, it is sufficient to ignore it.

[0088] <System-wide processing> Next, the operation sequence when the above-mentioned process is executed in this embodiment will be described with reference to Fig. 7. In the initial state, the RX is not placed on the TX. Also, the TX has an NFC tag that is permitted for power transmission built-in or attached thereto, or an NFC tag is placed around the TX, and the placed RX can read the data of the NFC tag. Also, in this embodiment, the description will be given assuming that the permitted power value is 10 watts, the transmittable power value is 12 watts, and the receivable power value is 15 watts, for example.

[0089] When RX detects that it has been placed on TX, it exchanges identification information and capability information, then starts communication in the negotiation phase and acquires NFC tag detection information from TX. RX executes NFC tag detection processing based on the acquired NFC tag detection information. At this time, RX detects an NFC tag, but since the detected NFC tag is an NFC tag permitted for power transmission, it performs control to continue the power transmission processing. After that, RX requests the permitted power value as the GP value, since the comparison of each power value is as described above: permitted power value < transmittable power value < receivable power value.

[0090] When RX is placed on TX in F600, TX and RX execute communication in the Ping phase of the WPC standard, and RX detects that it has been placed on TX (F601, S401). Next, in F602, RX transmits identification information and capability information to TX through communication in the Configuration phase of the WPC standard (S402). Next, TX and RX start communication in the Negotiation phase of the WPC standard, and in F603, RX transmits an FOD Status data packet of the WPC standard to TX. When TX receives the FOD Status data packet, it is determined that no foreign object exists in this embodiment, and transmits an ACK in F604.

[0091] Next, in F605, RX uses a General Request (GRQ) data packet of the WPC standard to transmit a capability information (CAP) notification request to TX. Upon receiving the capability information notification request, TX transmits a CAP data packet of the WPC standard to RX in F606. Note that the CAP data packet may include a transmittable power value, i.e., a Negotiable Load Power.

[0092] Next, in F607, RX transmits a notification request for NFC tag detection information to TX using a GRQ data packet of the WPC standard. When TX receives the notification request for NFC tag detection information, TX transmits NFC tag detection information to RX in F608. Note that the NFC tag detection information can be transmitted using a data packet defined in the WPC standard. In addition, the NFC tag detection information can include information such as whether or not TX has an NFC tag detection function, whether or not NFC tag detection has been performed, and whether or not an NFC tag has been detected as a result of NFC tag detection. Hereinafter, in this embodiment, the description will be given assuming that TX does not have an NFC tag detection function.

[0093] When RX receives the NFC tag detection information (S403), since TX does not have an NFC tag detection function, it judges (decides to execute) the NFC tag detection process (YES in S404). Then, RX transmits a pause request to TX using a GRQ data packet of the WPC standard in F609 (S405). Here, the pause request may include the stop time of the process in TX. Also, the pause request may be an EPT packet of the WPC standard, but may be requested by a different packet. When TX receives the pause request, it pauses the power transmission process in F610.

[0094] When the RX starts the NFC tag detection process, it reads the NFC tag in F611 (S406), and acquires the power transmission permitted tag data from the NFC tag in F612 (YES in S407, YES in S408). Next, in F613, the RX mainly stores the permitted power value as information contained in the power transmission permitted tag data (S409). The information stored by the RX may be the version of the Qi standard in the WPC standard, information on which version of NFC the NFC tag supports, and the version of the protection function, in addition to the permitted power value. In F614, the TX resumes the power transmission process. The processes of F615 to F620 are the same as those of F601 to F606, and therefore will not be described.

[0095] In F621, RX executes a process for determining the required power value (S412). RX detects an NFC tag for which power transmission is permitted (YES in S502, YES in S503, YES in S504). Currently, the permitted power value < the transmittable power value (YES in S507) and the permitted power value < the receivable power value (YES in S508), so RX determines the GP's required power value as the permitted power value (S511). Furthermore, in F622, RX executes a process for the first tag data other than the transmittable tag data (S515).

[0096] Next, in F623, RX stores the GP's requested power value in a Specific Request (SRQ) data packet of the WPC standard and transmits it to TX. When TX receives the SRQ data packet, which is a request from GP, since the requested power value is equal to or less than its own transmittable power value, it accepts the requested power value and stores it as a GP value in F624. Next, in F625, TX transmits an ACK as a response of acceptance to RX. When RX receives the ACK, it considers that the requested power value transmitted in F623 has been accepted, and stores the requested power value as a GP value in F626 (S413).

[0097] Next, in F627, RX sends a notification of the end of the negotiation phase to TX using a WPC standard SRQ data packet. When TX receives the notification of the end of the negotiation phase, it sends an ACK, which is an acceptance response, to RX in F628. After that, RX and TX calculate the reference value of power loss for the purpose of foreign object detection based on the determined GP value (F629, S414) and start power transmission and reception processing (F630, S415).

[0098] As described above, RX detects an NFC tag that allows power transmission, and when multiple pieces of NDEF information are read, RX checks whether there is any NDEF information that allows power transmission among the read NDEF information. If there is NDEF information that allows power transmission, RX requests the smallest value of the power value that the power transmitting device can transmit, the power value that the power receiving device can receive, and the power value that the NFC tag allows as the GP value. This makes it possible to continue power transmission and reception while suppressing damage and heat generation of the NFC tag even when an NFC tag that allows power transmission is present on TX, thereby realizing a safer and more efficient wireless power transmission system. In addition, RX can access services and functions that TX wants to provide to RX by processing NDEF information other than the NDEF information that allows power transmission. As described above, RX can perform appropriate processing when reading NDEF information, especially multiple pieces of NDEF information, from an NFC tag.

[0099] In this embodiment, in the explanation of the processing of NDEF information in S515 and S518 in Fig. 5, an example was shown in which RX processes the first NDEF information other than the NDEF information that allows power transmission, but this is not limited to this. For example, RX can also process the second or subsequent predetermined (specific) NDEF information. Alternatively, RX can sequentially process all of the target NDEF information or multiple selected NDEF information. In this case, even if RX reads NDEF information 703 in S518, it can simply ignore it.

[0100] [Second embodiment] Hereinafter, a second embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. In the second embodiment, the description of the same configurations and operations as those in the first embodiment will be omitted or simplified.

[0101] 9 is a diagram showing an example of the configuration of a wireless power transmission system according to this embodiment. The power receiving device 101, the power transmitting device 102, and the NFC tag 103 are the same as those in FIG. 1, so their explanation will be omitted. In this embodiment, the power receiving device 101 is called RX, and the power transmitting device 102 is called TX.

[0102] The NFC tag 804 is an NFC tag different from the NFC tag 103. Fig. 9 shows a situation where multiple NFC tags are present when the RX detects the NFC tag. The NFC tag 804 is, for example, an NFC tag that is unintentionally inserted between the RX and the TX, and may be, for example, an NFC card that supports touch payment or a key holder type NFC tag. In this embodiment, as shown in Fig. 9, the control of the RX in a situation where multiple NFC tags are present as seen from the RX in the environment of wireless power transmission between the RX and the TX will be described.

[0103] The configuration of RX in FIG. 2, the configuration of TX in FIG. 3, and the process executed by RX during wireless power transmission in FIG. 4 are the same as those in the first embodiment, and therefore will not be described.

[0104] FIG. 10 is a detailed flowchart of the NFC tag detection process executed in S406 in the flowchart of wireless power transmission shown in FIG. 4 in this embodiment.

[0105] In S901, after starting processing, the RX sets the type of NFC tag to be detected. There are multiple NFC tags, Type-A / Type-B / Type-F, and sets the tag type for which detection has not yet been performed. In S902, the RX executes NFC tag detection. This detection can be executed, for example, by a reader / writer function that complies with the NFC standard. In S903, the RX determines whether or not NFC tag detection was successful. If the RX determines that NFC tag detection was successful (YES in S903), it proceeds to processing in S904. On the other hand, if the RX determines that NFC tag detection failed (NO in S903), it ends processing.

[0106] In S904, the RX holds the NDEF information read from the NFC tag. The RX manages the information read for each NFC tag for which detection has been performed. In S905, the RX judges whether detection processing has been performed for all types of NFC tags. This is processing to judge whether detection has been performed for all of Type-A / Type-B / Type-F, for example. If the RX judges that detection has been performed for all types (YES in S905), it ends the processing. On the other hand, if the RX judges that detection has not been performed for all types (NO in S905), it returns to S901 and performs NFC tag detection processing for the next type.

[0107] The above is the NFC tag detection process executed during wireless power transmission in Fig. 4 in this embodiment. By executing the detection process for all NFC tag types, the RX can appropriately grasp and process the situation even when multiple NFC tags are present as in Fig. 8. For example, when the NFC tag 103 and the NFC tag 804 are different types of NFC tags, the RX can read NDEF information from all tags. Also, when the NFC tag 103 and the NFC tag 804 are the same type of NFC tag, the RX can grasp that at least one NFC tag is present because it is determined in S903 that the NFC tag detection has failed.

[0108] When two or more identical NFC tag types exist, the RX may have an NFC communication unit capable of detecting them individually. In that case, the RX may detect all of those NFC tags according to the flowchart shown in Fig. 10 and read the NDEF information stored in each of those NFC tags.

[0109] Figures 11 and 12 are flowcharts mainly showing the process of determining the required power value executed by RX in S412 of Figure 4. The flowcharts in Figures 11 and 12 are based on the flowcharts in Figures 5 and 6 and are expanded to handle the case where multiple NFC tags are present as seen from RX as shown in Figure 9. Therefore, explanations of processes that overlap with the processes in Figures 5 and 6 will be omitted.

[0110] S1001 to S1004 are the same as S501 to S504. In S1005, RX checks all NDEF information for each NFC tag. Since RX executes NFC tag detection for all NFC types in the process of the flowchart in Fig. 10 and holds NDEF information for each detected NFC tag, it is possible to check the NDEF information for each NFC tag. In this embodiment, RX checks the NDEF information read from the NFC tag 103 and the NFC tag 804.

[0111] Here, the NDEF information held by NFC tag 103 is the same as that shown in Fig. 8. Meanwhile, the NDEF information held by NFC tag 804 is shown in Fig. 14. An NFC tag that supports touch payment is assumed as the NFC tag 804. An NFC tag that supports touch payment has, for example, payment information in NDEF information 1201 and information that permits power transmission (power transmission permitted tag data) in NDEF information 1202. The NDEF information of NFC tag 804 is not limited to that shown in Fig. 14, and various information can be set depending on the use of NFC tag 804.

[0112] In S1006, RX determines whether or not all NFC tags are tags for which power transmission is permitted. When RX determines that all detected NFC tags are NFC tags for which power transmission is permitted (YES in S1006), it proceeds to the process of S1007. On the other hand, when RX determines that at least one of the detected NFC tags is not an NFC tag for which power transmission is permitted (NO in S1006), it determines the limit power value as the required power value (S1010) and ends the process of determining the required power value.

[0113] In S1007, RX sets the smallest value among the allowable power values ​​of the information that allows power transmission of all NFC tags as the allowable power value to be used in the subsequent processing. In this embodiment, this means using the allowable power value (e.g., 8 W) of the NDEF information 1202.

[0114] The subsequent processes from S1008 to S1015 are the same as the processes from S507 to S514. Here, the "allowable power value" in S1008, S1009 and S1012 means the allowable power value selected in S1007.

[0115] In S1016, RX executes processing for the first NDEF information among the NDEF information other than the NDEF information that allows power transmission. When detecting multiple NFC tags, processing the first NDEF information other than the NDEF information that allows power transmission means processing the NDEF information 701 if the NFC tag 103 is detected before the NFC tag 804 in the flowchart of Fig. 10. In other words, this is processing to display a UI for accessing a URL to a service provided together with TX. On the other hand, if the NFC tag 804 is detected before the NFC tag 103, RX starts an application that processes the payment information of the NDEF information 1201 as processing the first NDEF information other than the NDEF information that allows power transmission.

[0116] <System-wide processing> Next, the operation sequence when the above-mentioned process is executed in this embodiment will be described with reference to Fig. 13. The flowchart in Fig. 13 is based on the operation sequence in Fig. 7 and is expanded to handle the case where multiple NFC tags are present as seen from the RX shown in Fig. 9. Therefore, a description of the overlapping processes will be omitted.

[0117] F1100 to F1110 are the same as F600 to F610. F1111 to F1113 are substantially the same as F611 to F613, but are loop processes executed for all NFC tags (S901 to S905).

[0118] F1114 is a process for selecting the minimum allowable power value from among the allowable power values ​​in the NDEF information that allow power transmission obtained from multiple NFC tags in the loop process from F1111 to F1113 (S1007). In this embodiment, the NDEF information 703 and the NDEF information 1202 are the targets of the process, and 8 W in the NDEF information 1202 is selected. The subsequent processes from F1115 to F1131 are the same as those from F614 to F630.

[0119] In this embodiment, in the explanation of S1016 and S1019 in Fig. 11 and 12, an example was shown in which the first NDEF information other than the NDEF information that permits power transmission is processed among the NDEF information obtained by detecting all tag types in the flowchart in Fig. 10. However, this is not limited to this, and RX can also process, for example, the second or subsequent predetermined NDEF information. Alternatively, control can be performed to process all or multiple pieces of target NDEF information in sequence.

[0120] S1016 and S1019 in Figs. 11 and 12 may be processes executed only for tag data of a specific NFC tag. The specific NFC tag is, for example, an NFC tag related to the power transmitting device. In this case, RX needs to obtain information about TX from the NFC tag. In the example shown in Fig. 8, the NDEF information 702 of the NFC tag 103 corresponds to this. RX can recognize the presence of an NFC tag related to the power transmitting device by checking the device type (TX) information of the NDEF information 702. Then, RX can perform control such that, among the NDEF information obtained from the NFC tag 103, the first or multiple pieces of NDEF information thereafter (for example, all pieces thereafter) other than the NDEF information that permits power transmission are sequentially processed.

[0121] [Other embodiments] In the first embodiment, for example, RX does not need to execute the process of S515. The process after YES in S501 is performed under the condition that RX is placed on TX. Therefore, RX can perform only the process for NDEF information that allows power transmission in S505 and S506, and not the process for other NDEF information. Similarly, in the second embodiment, RX does not need to execute the process of S1016. The process after YES in S1001 is performed under the condition that RX is placed on TX. Therefore, RX can be controlled to only execute the process for NDEF information that allows power transmission from S1005 to S1007, and not execute the process for other NDEF information.

[0122] In the above embodiments, an NFC tag using wireless communication defined by the NFC standard has been exemplified as a wireless communication tag, but other general RFID (Radio frequency identifier) ​​tags, etc. may also be used. In this case, the NFC tag is replaced with an IC tag / card, an RF tag / card, etc.

[0123] 4 to 6 and 10 to 12 are processes executed by RX, but the power transmitting device may execute those processes. In this case, the power transmitting device may further include an NFC communication unit similar to that of RX in addition to the configuration of TX shown in Fig. 3. The NFC communication unit functions as a detection unit that detects an NFC tag and a reading unit that reads tag data of the detected NFC tag.

[0124] A part (or in some cases, the whole) of the configuration in the above embodiment may be replaced with another configuration having a similar function, or may be omitted, or another configuration may be added. In addition, the present invention is not limited to the WPC standard, and can be applied to various standards.

[0125] The power transmitting device and the power receiving device may be, for example, an image input device such as an imaging device (still camera, video camera, etc.) or a scanner, or an image output device such as a printer, a copier, a projector, etc. The power transmitting device and the power receiving device may be a storage device such as a hard disk device or a memory device, or an information processing device such as a personal computer (PC), a smartphone, or a tablet device.

[0126] The power receiving device of the present disclosure may also be an information terminal device. For example, the information terminal device has a display unit (display) that displays information to a user and is supplied with power received from a power receiving antenna. The power received from the power receiving antenna is stored in a power storage unit (battery), and power is supplied from the battery to the display unit. In this case, the power receiving device may have a communication unit that communicates with another device different from the power transmitting device. The communication unit may be compatible with communication standards such as NFC communication and the fifth generation mobile communication system (5G).

[0127] The power receiving device of the present disclosure may be a vehicle such as an automobile. For example, the automobile, which is the power receiving device, may receive power from a charger (power transmitting device) via a power transmitting antenna installed in a parking lot. The automobile, which is the power receiving device, may receive power from a charger (power transmitting device) via a power transmitting antenna embedded in a road. Such an automobile supplies the received power to a battery. The power of the battery may be supplied to a driving unit (motor, electric unit) that drives the wheels, or may be used to drive a sensor used for driving assistance or a communication unit that communicates with an external device. That is, in this case, the power receiving device may have, in addition to the wheels, a battery, a motor or sensor that is driven using the received power, and a communication unit that communicates with devices other than the power transmitting device. Furthermore, the power receiving device may have a storage unit that stores a person. For example, the sensor may be a sensor used to measure the distance between the vehicle and other obstacles. The communication unit may be compatible with, for example, a global positioning system (Global Positioning System, Global Positioning Satellite, GPS). The communication unit may be compatible with communication standards such as the fifth generation mobile communication system (5G), etc. The vehicle may be a bicycle or a motorcycle.

[0128] The power receiving device of the present disclosure may be an electric tool, a home appliance, or the like. These devices, which are power receiving devices, may have a motor that is driven by the received power stored in the battery, in addition to a battery. These devices may also have a notification means for notifying the remaining battery level, etc. These devices may also have a communication unit that communicates with other devices different from the power transmitting device. The communication unit may be compatible with communication standards such as NFC and the fifth generation mobile communication system (5G).

[0129] The power transmitting device of the present disclosure may be an in-vehicle charger that transmits power to a mobile information terminal device such as a smartphone or tablet that supports wireless power transmission within the vehicle. Such an in-vehicle charger may be provided anywhere in the vehicle. For example, the in-vehicle charger may be provided in the console of the vehicle, or in the instrument panel (instrument panel, dashboard), or in a position between passenger seats, on the ceiling, or in the door. However, it is preferable not to provide the charger in a place that interferes with driving. In addition, although the power transmitting device has been described using an example of an in-vehicle charger, such a charger is not limited to being provided in a vehicle, and may be provided in a transport such as a train, an airplane, or a ship. In this case, the charger may also be provided in a position between passenger seats, on the ceiling, or in the door.

[0130] The power transmitting device may also be a vehicle such as an automobile equipped with an on-board charger. In this case, the power transmitting device has wheels and a battery, and supplies power to the power receiving device via a power transmitting circuit unit and a power transmitting antenna using power from the battery.

[0131] The present disclosure can also be realized by a process in which a program for implementing one or more functions of the above-described embodiments is supplied to a system or device via a network or a storage medium, and one or more processors in a computer of the system or device read and execute the program. It can also be realized by a circuit (e.g., ASIC) that implements one or more functions.

[0132] In addition, a part of the process described with reference to the flowchart in this disclosure may be realized by hardware. For example, a specific compiler may be used to automatically generate a dedicated circuit on an FPGA from a program for realizing each step. Also, a gate array circuit may be formed in the same manner as an FPGA and realized as hardware.

[0133] The disclosure of this embodiment includes the following configuration, method, and program. (Configuration 1) A power receiving device that wirelessly receives power from a power transmitting device, A detection means for detecting an NFC (Near Field Communication) tag; A reading means for reading one or more tag data from the detected NFC tag; and a processing means for switching a processing method for the one or more tag data and executing processing depending on whether the tag data is read by the reading means in a state in which the power receiving device is capable of receiving power from the power transmitting device. A power receiving device comprising: (Configuration 2) When the tag data is read while the power receiving device is in a state where the power receiving device is capable of receiving power, the processing means checks whether or not there is power transmission permission tag data indicating that power transmission is permitted among the one or more tag data. 2. The power receiving device according to configuration 1. (Configuration 3) When the power transmission permission tag data is present, the processing means determines power information indicating power to be requested from the power transmitting device in negotiation with the power transmitting device based on the power transmission permission tag data. 3. The power receiving device according to configuration 2. (Configuration 4) The power receiving device further includes a calculation unit for calculating a receivable power value based on an operation state of the power receiving device, The processing means determines the power information based on the power transmission permission tag data and the receivable power value. 4. The power receiving device according to configuration 3. (Configuration 5) When the power transmission permission tag data is not present, the processing means determines power information of power limited to a predetermined value or less in negotiation with the power transmitting device. 3. The power receiving device according to configuration 2. (Configuration 6) The processing means further performs processing on one or more tag data other than the power transmission permission tag data. 6. The power receiving device according to any one of configurations 3 to 5. (Configuration 7) The processing means performs processing on a specific tag data among one or more tag data other than the power transmission permission tag data. 7. The power receiving device according to configuration 6, (Configuration 8) The specific tag data is the first tag data. 8. The power receiving device according to claim 7, (Configuration 9) The processing means sequentially processes a plurality of tag data other than the power transmission permission tag data, or processes one or more tag data selected from the plurality of tag data. 7. The power receiving device according to configuration 6, (Configuration 10) The power transmission permission tag data includes a power value that the NFC tag permits to transmit. 10. The power receiving device according to any one of configurations 2 to 9. (Configuration 11) When a plurality of NFC tags are detected by the detection means, the reading means reads one or more pieces of tag data of each of all the NFC tags. 2. The power receiving device according to configuration 1. (Configuration 12) The processing means performs processing on each of the one or more tag data. 12. The power receiving device according to configuration 11. (Configuration 13) The processing means checks whether or not there is power transmission permission tag data indicating that power transmission is permitted among the one or more tag data read from all of the NFC tags. 13. The power receiving device according to configuration 11 or 12. (Configuration 14) The power receiving device further includes a calculation unit for calculating a receivable power value based on an operation state of the power receiving device, When all of the NFC tags have the power transmission permission tag data, the processing means determines power information indicating power to be requested from the power transmission device in negotiation with the power transmission device based on the minimum value of each power value permitted for power transmission by each of the NFC tags, which is included in the power transmission permission tag data, and the receivable power value. 14. The power receiving device according to configuration 13. (Configuration 15) When at least one of the NFC tags does not have the power transmission permission tag data, the processing means determines power information of power limited to a predetermined value or less in negotiation with the power transmitting device. 14. The power receiving device according to configuration 13. (Configuration 16) The processing means further performs processing on one or more tag data other than the power transmission permission tag data. 16. The power receiving device according to any one of configurations 13 to 15. (Configuration 17) The processing means performs processing on one or more tag data other than the power transmission permission tag data, which is read from a specific NFC tag among all the NFC tags. 17. The power receiving device according to configuration 16, (Configuration 18) The particular NFC tag is an NFC tag associated with a power transmitting device. 18. The power receiving device according to configuration 17. (Configuration 19) The processing means does not perform processing on tag data other than the power transmission permission tag data. 14. The power receiving device according to configuration 2 or 13. (Configuration 20) When the tag data is read in a state in which the power receiving device cannot receive power from the power transmitting device, the processing means performs processing related to at least one of the tag data that has been read. 2. The power receiving device according to configuration 1. (Configuration 21) The processing means performs processing on the specific tag data. 21. The power receiving device according to configuration 20. (Configuration 22) A power transmitting device that wirelessly transmits power to a power receiving device, A detection means for detecting an NFC (Near Field Communication) tag; A reading means for reading one or more tag data from the detected NFC tag; and a processing means for switching a processing method for the one or more tag data and executing processing depending on whether the tag data is read by the reading means in a state in which the power receiving device is capable of receiving power from the power transmitting device. A power transmitting device comprising: (method) A method for controlling a power receiving device that wirelessly receives power from a power transmitting device, comprising: A detection step of detecting a Near Field Communication (NFC) tag; A reading step of reading one or more tag data from the detected NFC tag; and a processing step of switching a processing method for the one or more tag data and executing the processing depending on whether the tag data is read in the reading step while the power receiving device is in a state in which the power transmitting device can receive power. A control method for a power receiving device comprising: (program) The method includes the steps described above. A program characterized by:

[0134] The present disclosure has been described above in detail based on preferred embodiments thereof, but the present disclosure is not limited to the above embodiments, and various modifications are possible based on the gist of the present disclosure, and these modifications are not excluded from the scope of the present disclosure. [Explanation of symbols]

[0135] 101 Power receiving device 102 Power transmission equipment 103 NFC Tags 201, 301 Control section 202 NFC communication unit 203 WPC Communications Department

Claims

1. A power receiving device that wirelessly receives power from a power transmitting device, A detection means for detecting a Near Field Communication (NFC) tag; A reading means for reading one or more tag data from the detected NFC tag; and a processing means for switching a processing method for the one or more tag data and executing processing depending on whether the tag data is read by the reading means in a state in which the power receiving device is capable of receiving power from the power transmitting device. A power receiving device comprising:

2. When the tag data is read while the power receiving device is in a state where the power receiving device is capable of receiving power, the processing means checks whether or not there is power transmission permission tag data indicating that power transmission is permitted among the one or more tag data. The power receiving device according to claim 1 .

3. When the power transmission permission tag data is present, the processing means determines power information indicating power to be requested from the power transmitting device in negotiation with the power transmitting device based on the power transmission permission tag data. The power receiving device according to claim 2 .

4. The power receiving device further includes a calculation unit for calculating a receivable power value based on an operation state of the power receiving device, The processing means determines the power information based on the power transmission permission tag data and the receivable power value. The power receiving device according to claim 3 .

5. When the power transmission permission tag data is not present, the processing means determines power information of power limited to a predetermined value or less in negotiation with the power transmitting device. The power receiving device according to claim 2 .

6. The processing means further performs processing on one or more tag data other than the power transmission permission tag data. The power receiving device according to claim 3 .

7. The processing means performs processing on a specific tag data among one or more tag data other than the power transmission permission tag data. The power receiving device according to claim 6 .

8. The specific tag data is the first tag data. The power receiving device according to claim 7 .

9. The processing means sequentially processes a plurality of tag data other than the power transmission permission tag data, or processes one or more tag data selected from the plurality of tag data. The power receiving device according to claim 6 .

10. The power transmission permission tag data includes a power value that the NFC tag permits to transmit power. The power receiving device according to claim 2 .

11. When a plurality of NFC tags are detected by the detection means, the reading means reads one or more pieces of tag data of each of all the NFC tags. The power receiving device according to claim 1 .

12. The processing means performs processing on each of the one or more tag data. The power receiving device according to claim 11 .

13. The processing means checks whether or not there is power transmission permission tag data indicating that power transmission is permitted, among the one or more tag data read from all of the NFC tags. The power receiving device according to claim 11 .

14. The power receiving device further includes a calculation unit for calculating a receivable power value based on an operation state of the power receiving device, When all of the NFC tags have the power transmission permission tag data, the processing means determines power information indicating power to be requested from the power transmitting device in negotiation with the power transmitting device based on the minimum value of each power value permitted for power transmission by each of the NFC tags, which is included in the power transmission permission tag data, and the receivable power value. The power receiving device according to claim 13 .

15. When at least one of the NFC tags does not have the power transmission permission tag data, the processing means determines power information of power limited to a predetermined value or less in negotiation with the power transmitting device. The power receiving device according to claim 13 .

16. The processing means further performs processing on one or more tag data other than the power transmission permission tag data. The power receiving device according to claim 13 .

17. The processing means performs processing on one or more pieces of tag data other than the power transmission permission tag data, which are read from a specific NFC tag among all of the NFC tags. The power receiving device according to claim 16 .

18. The particular NFC tag is an NFC tag associated with a power transmitting device.

20. The power receiving device according to claim 17,

19. The processing means does not perform processing on tag data other than the power transmission permission tag data.

14. The power receiving device according to claim 2 or 13.

20. When the tag data is read in a state in which the power receiving device cannot receive power from the power transmitting device, the processing means performs processing related to at least one of the tag data that has been read. The power receiving device according to claim 1 .

21. The processing means performs processing on the specific tag data. The power receiving device according to claim 20 .

22. A power transmitting device that wirelessly transmits power to a power receiving device, A detection means for detecting a Near Field Communication (NFC) tag; A reading means for reading one or more tag data from the detected NFC tag; and a processing means for switching a processing method for the one or more tag data and executing processing depending on whether the tag data is read by the reading means in a state in which the power receiving device is capable of receiving power from the power transmitting device. A power transmitting device comprising:

23. A method for controlling a power receiving device that wirelessly receives power from a power transmitting device, comprising: a detection step of detecting a near field communication (NFC) tag; a reading step of reading one or more tag data from the detected NFC tag; and a processing step of switching a processing method for the one or more tag data and executing the processing depending on whether the tag data is read in the reading step while the power receiving device is in a state in which the power transmitting device can receive power. A control method for a power receiving device comprising:

24. The method of claim 23 further comprising the steps of: causing a computer of a power receiving device to execute the steps; A program characterized by:

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