WO2023063110A1

WO2023063110A1 - Power reception device and power transmission device

Info

Publication number: WO2023063110A1
Application number: PCT/JP2022/036675
Authority: WO
Inventors: 野歩宮沢
Original assignee: キヤノン株式会社
Priority date: 2021-10-11
Filing date: 2022-09-30
Publication date: 2023-04-20

Abstract

According to the present invention, a power reception device wirelessly receives power from a power transmission device and has a first control means that controls processing related to reception of power from the power transmission device, a second control means that controls a Near Field Communication (NFC) function, and a third control means that controls the entire power reception device. The first control means controls the operations of the second control means on the basis of the operating state of the third control means.

Description

Power Receiving Device and Transmitting Device

The present disclosure relates to a power receiving device, a power transmitting device, a control method for a power receiving device, a control method for a power transmitting device, and a program.

In recent years, technological development of wireless power transmission systems has been widely carried out. Patent Literature 1 discloses a power transmitting device and a power receiving device conforming to the standard (WPC standard) formulated by the Wireless Power Consortium (WPC), a standardization body.

When an NFC tag that operates without a battery is exposed to an electromagnetic field that performs high-power power transmission processing, the antenna element of the NFC tag may be damaged. Therefore, during NFC communication with the NFC tag, it is essential that the power transmission device stop power transmission processing.

On the other hand, the NFC function defines a card emulation mode in which a battery-powered NFC module behaves like an NFC tag. Some power receiving devices and the like that are supposed to be equipped with the WPC function also include an NFC module that supports the card emulation mode.

When the power transmitting device detects a nearby NFC device, it is difficult to distinguish whether it is a battery-free NFC tag or an NFC module operating in card emulation mode. When the power transmission device identifies these as NFC tags, it stops the power transmission process or limits the power transmission to protect the NFC tags.

On the other hand, Patent Document 2 discloses a technique of disabling the NFC function when a power transmitting device is detected during non-contact charging in a power receiving device equipped with a WPC function and an NFC (Near Field Communication) function. disclosed. In Patent Document 2, in a power receiving device equipped with an NFC function that operates in card emulation mode, power can be received with high power by disabling the NFC function when a power transmitting device is detected during non-contact charging. becomes.

Japanese Unexamined Patent Application Publication No. 2016-7116 JP 2020-89134 A

Some smartphones in recent years have a configuration in which a WPC module that supports the WPC function and an NFC module are separated as sub-controllers from the main controller that controls the entire smartphone. In a smartphone with such a configuration, power consumption may be reduced by stopping the operation of the main control unit and operating only the sub-control unit when the remaining charge level is low. In such a situation, depending on the cooperation between the WPC module and the NFC module, for example, the NFC function of the power receiving device may not be disabled and the power to be received may be limited.

An object of the present disclosure is to enable a power receiving device equipped with an NFC function to perform appropriate power receiving processing.

The power receiving device is a power receiving device that wirelessly receives power from a power transmitting device, and includes first control means for controlling processing related to power reception with the power transmitting device, and NFC (Near Field Communication) function. a second control means; and a third control means for controlling the entire power receiving device. It controls the operation of the control means.

According to the present disclosure, it is possible to realize appropriate power reception processing in a power receiving device equipped with an NFC function.

1 is a diagram illustrating a configuration example of a wireless power transmission system; FIG. 2 is a block diagram showing a configuration example of a power receiving device; FIG. It is a block diagram which shows the structural example of a power transmission apparatus. 4 is an operation sequence diagram of a power receiving device and a power transmitting device; FIG. 4 is a flowchart of power receiving processing of the power receiving device. 9 is a flowchart of processing for switching NFC function control to the first control unit; 9 is a flowchart of processing for switching NFC function control to the first control unit; 9 is a flowchart of processing for switching NFC function control to a third control unit; 9 is a flowchart of processing for switching NFC function control to a third control unit; 4 is a flowchart of power transmission processing of the power transmission device; 4 is an operation sequence diagram of a power receiving device and a power transmitting device; FIG. 4 is a flowchart of power receiving processing of the power receiving device. 4 is a flowchart of power transmission processing of the power transmission device;

Hereinafter, the embodiments will be described in detail with reference to the drawings. In addition, the following embodiments do not limit the scope of the claims. Although multiple features are described in the embodiments, not all of these multiple features are essential, and multiple features may be combined arbitrarily. Furthermore, in the drawings, the same or similar configurations are denoted by the same reference numerals, and redundant description is omitted.

(First embodiment)
FIG. 1 is a diagram showing a configuration example of a wireless power transmission system 100 according to the first embodiment. The wireless power transmission system 100 has, in one example, a power receiving device 101 , a power transmitting device 102 , and an NFC (Near Field Communication) tag 103 .

The power receiving device 101 is, for example, an electronic device that receives power from the power transmitting device 102 and charges an internal battery. In addition, the power receiving apparatus 101 includes a WPC function conforming to the WPC standard, and additionally supports the device authentication protocol of the WPC standard. Further, the power receiving apparatus 101 is equipped with an NFC function, and can operate in, for example, a card emulation mode using the NFC function to perform electronic money settlement and the like.

The power transmitting device 102 is, for example, an electronic device that wirelessly transmits power to the power receiving device 101 placed on the power transmitting device 102 . The power transmitting device 102 wirelessly transmits power to the power receiving device 101 via the power transmitting coil. The power transmission device 102 also has an NFC function for performing NFC communication and reading the NFC tag 103 . The power transmission device 102 can detect an NFC device by using the NFC function, and can stop or restrict power transmission processing to protect the NFC tag 103 . The NFC tag 103 is a device that operates without a battery and realizes NFC communication.

In the following description, a smart phone is used as an example of the power receiving device 101, and a charger is used as an example of the power transmitting device 102, but the present invention is not limited to this. The power receiving device 101 and the power transmitting device 102 may be built in other devices (cameras, smartphones, tablet PCs, laptops, automobiles, robots, medical devices, printers) and configured to supply power to those devices. good. Further, although the WPC standard will be used as an example of the wireless power transmission system 100 below, the present invention is not limited to this, and other wireless power transmission standards may be used. Specific devices and processing that constitute FIG. 1 will be described below.

FIG. 2 is a diagram showing an example of the configuration of the power receiving device 101 according to this embodiment. The power receiving device 101 has three control units: a first control unit 201 , a second control unit 202 and a third control unit 203 . The power receiving apparatus 101 also includes an NFC communication unit 204, a WPC communication unit 205, a power receiving coil 206, a power receiving unit 207, a detection unit 208, a charging unit 209, a battery 210, a notification unit 211, an operation unit 212, a memory 213, and a timer 214. have

The first control unit 201 controls processing for the power receiving device 101 to receive power from the power transmitting device 102 . The second control unit 202 controls processing related to NFC communication. A third control unit 203 controls the entire power receiving apparatus 101 . Further, the third control unit 203 may perform control for executing applications other than wireless power transmission. Also, the third control unit 203 measures time using a timer 214 . Each of the first control unit 201, the second control unit 202, and the third control unit 203 performs control by executing a control program stored in the memory 213, for example. Each of the first control unit 201, the second control unit 202, and the third control unit 203 includes one or more processors such as a CPU (Central Processing Unit) and an MPU (Micro Processing Unit).

Each of the first control unit 201, the second control unit 202, and the third control unit 203 is composed of dedicated hardware for specific processing such as an application specific integrated circuit (ASIC). may Also, each of the first control unit 201, the second control unit 202, and the third control unit 203 includes an array circuit such as an FPGA (Field Programmable Gate Array) compiled to execute predetermined processing. may be configured to include Each of the first control unit 201, the second control unit 202, and the third control unit 203 causes the memory 213 to store information to be stored during execution of various processes. Also, each of the first control unit 201, the second control unit 202, and the third control unit 203 is connected to each other via a communication interface, and data communication is possible. Specifically, the communication interface may be any interface that realizes data communication such as I2C or GPIO.

The NFC communication unit 204 is a hardware module that implements the NFC function. Specifically, the NFC communication unit 204 has three modes: a card emulation mode for substituting 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 NFCs. come true. For example, the NFC communication unit 204 uses a card emulation mode to enable electronic money settlement.

The WPC communication unit 205 performs wireless power transmission communication based on the WPC standard with the communication unit 306 ( FIG. 3 ) of the power transmission device 102 via the power receiving coil 206 . WPC communication unit 205 demodulates the electromagnetic wave input from power receiving coil 206 to acquire information transmitted from power transmission apparatus 102, and load-modulates the electromagnetic wave to superimpose information to be transmitted to power transmission apparatus 102 on the electromagnetic wave. By doing so, communication is performed with the power transmission device 102 . That is, the communication performed by the communication unit 306 is superimposed on the electromagnetic wave transmitted from the power transmission coil of the power transmission device 102 .

The power receiving unit 207 receives power wirelessly transmitted from the power transmitting device 102 via the power receiving coil 206 . The detection unit 208 detects that the power receiving apparatus 101 is placed on the power transmitting apparatus 102 based on the WPC standard. The detection unit 208 detects, for example, at least one of the voltage value and the current value of the power receiving coil 206 when the power receiving unit 207 receives the WPC standard Digital Ping via the power receiving coil 206 . For example, when the voltage value of the power receiving coil 206 is below a predetermined voltage threshold or the current value of the power receiving coil 206 exceeds a predetermined current threshold, the detection unit 208 detects whether the power receiving apparatus 101 is placed on the power transmitting apparatus 102. It can be determined that

The charging section 209 charges the battery 210 based on the power supplied from the power receiving section 207 . Further, the charging unit 209 starts or stops charging the battery 210 based on the control of the third control unit 203, and determines the power used for charging the battery 210 based on the state of charge of the battery 210. adjust. When the power used by the charging unit 209 changes, the power supplied from the power receiving unit 207 to the charging unit 209, that is, the power received by the power receiving apparatus 101 also changes. A charging unit 209 illustrated here is a load in the power receiving apparatus 101 .

The battery 210 supplies the entire power receiving apparatus 101 with power necessary for controlling each unit of the power receiving apparatus 101 by the third control unit 203 and for power reception and communication. Also, battery 210 stores electric power received via power receiving coil 206 .

The notification unit 211 notifies the user of information by any method such as visual, auditory, or tactile. The notification unit 211 notifies the user of, for example, the charging state of the power receiving device 101 and the state of power transmission in the wireless power transmission system 100 including the power transmitting device 102 and the power receiving device 101 as shown in FIG. The notification unit 211 includes, for example, a liquid crystal display, an LED, a speaker, a vibration generation circuit, and other notification devices.

The operation unit 212 has a reception function for receiving operations on the power receiving device 101 from the user. The operation unit 212 includes, for example, buttons, 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. A device such as a touch panel in which the notification unit 211 and the operation unit 212 are integrated may be used.

The memory 213 stores various information such as identification information and device configuration information, control programs, and the like. Note that the memory 213 may store information obtained by a functional unit different from the third control unit 203 .

The timer 214 measures time by, for example, a count-up timer that measures the elapsed time from the start time, a count-down timer that counts down from a set time, or the like.

FIG. 3 is a diagram showing an example of the configuration of the power transmission device 102 according to this embodiment. Power transmission device 102 includes control unit 301 , power supply unit 302 , power transmission unit 303 , detection unit 304 , power transmission coil 305 , communication unit 306 , notification unit 307 , operation unit 308 , memory 309 , and timer 310 .

The control unit 301 controls the entire power transmission device 102 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. The control unit 301 also performs control related to power transmission control in the power transmission device 102 . The control unit 301 also controls the NFC function in the power transmission device 102 . Furthermore, the control unit 301 may perform control for executing applications other than wireless power transmission. The control unit 301 includes, for example, one or more processors such as CPU and MPU.

Note that the control unit 301 may be configured by a single processor, or a main control unit that controls the entire system and a sub-control unit that controls power transmission processing and NFC communication as described above with reference to FIG. It may be realized by a processor. Note that the control unit 301 includes dedicated hardware for specific processing such as an application specific integrated circuit (ASIC) and an array circuit such as an FPGA compiled to execute predetermined processing. may The control unit 301 causes the memory 309 to store information to be stored during execution of various processes. Also, the control unit 301 measures time using a timer 310 .

The power supply unit 302 supplies power necessary for the control of the power transmission device 102 by the control unit 301 and power transmission and communication to the entire power transmission device 102 . The power supply unit 302 is, for example, a commercial power supply or a battery. The battery stores electric power supplied from a commercial power source.

Power transmission unit 303 converts the DC or AC power input from power supply unit 302 into AC frequency power in the frequency band used for wireless power transmission, and outputs the AC frequency power to power transmission coil 305 . to generate electromagnetic waves to receive power. Note that the frequency of the AC power generated by the power transmission unit 303 is, for example, about several hundred kHz (eg, 110 kHz to 205 kHz). Based on an instruction from the control unit 301 , the power transmission unit 303 outputs AC frequency power to the power transmission coil 305 so that the power transmission coil 305 outputs an electromagnetic wave for power transmission to the power receiving apparatus 101 . In addition, the power transmission unit 303 controls the intensity of the electromagnetic wave to be output by adjusting the voltage (transmission voltage) or the current (transmission current) output to the power transmission coil 305, or both. Increasing the transmission voltage or transmission current increases the intensity of the electromagnetic waves, and decreasing the transmission voltage or transmission current decreases the intensity of the electromagnetic waves. Further, the power transmission unit 303 performs output control of AC frequency power so that power transmission from the power transmission coil 305 is started or stopped based on an instruction from the control unit 301 . Furthermore, the power transmission unit 303 notifies the control unit 301 of the current power transmission, so that the control unit 301 can know the power transmission at that timing at any timing. Note that measurement of transmitted power and notification to the control unit 301 may be performed by a unit other than the power transmission unit 303 .

The detection unit 304 detects whether an object is placed on the power transmission device 102 based on the WPC standard. Specifically, the detection unit 304 detects whether or not an object is placed on the interface surface of the power transmission device 102 . The detection unit 304 detects, for example, at least one of the voltage value and the current value of the power transmission coil 305 when the power transmission unit 303 transmits WPC standard Analog Ping via the power transmission coil 305 . Note that the detection unit 304 may detect changes in impedance. Then, the detection unit 304 determines that an object is placed on the power transmission device 102 when the voltage value of the power transmission coil 305 is lower than a predetermined voltage value or when the current value of the power transmission coil 305 exceeds a predetermined current value. .

Whether this object is the power receiving device 101 or another foreign object is determined by the presence or absence of a predetermined response to the Digital Ping subsequently transmitted by the communication unit 306 . That is, if the power transmitting device 102 receives a predetermined response, the object is determined to be the power receiving device 101; otherwise, the object is determined to be a different object from the power receiving device 101.

The communication unit 306 performs control communication with the power receiving apparatus 101 based on the WPC standard as described above. The communication unit 306 modulates the electromagnetic wave output from the power transmission coil 305 and transmits information to the power receiving apparatus 101 for communication. The communication unit 306 also obtains information transmitted by the power receiving apparatus 101 by demodulating the electromagnetic wave that is output from the power transmitting coil 305 and modulated in the power receiving apparatus 101 . That is, the communication performed by the communication unit 306 is superimposed on the electromagnetic waves transmitted from the power transmission coil 305 . Further, the communication unit 306 performs NFC communication and detects the NFC tag 103 of the device that transmits power. In the communication unit 306, a module for performing control communication based on the WPC standard and a module for performing NFC communication may be implemented by one piece of hardware, or may be implemented by separate pieces of hardware.

The notification unit 307 notifies the user of information by any method such as visual, auditory, or tactile. The notification unit 307 notifies the user of information indicating, for example, the state of charge of the power transmitting apparatus 102 and the state of power transmission in the wireless power transmission system 100 including the power transmitting apparatus 102 and the power receiving apparatus 101 as shown in FIG. The notification unit 307 includes, for example, a liquid crystal display, an LED, a speaker, a vibration generation circuit, and other notification devices.

The operation unit 308 has a reception function for receiving operations on the power transmission device 102 from the user. The operation unit 308 includes, for example, buttons, 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. A device such as a touch panel in which the notification unit 307 and the operation unit 308 are integrated may be used.

The memory 309 stores various information such as identification information and ability information, control programs, and the like. Also, the capability information includes information indicating whether or not the device has high-accuracy foreign object detection processing capability. Note that the memory 309 may store information obtained by a functional unit different from the control unit 301 .

The timer 310 measures time by, for example, a count-up timer that measures the elapsed time from the activation time, a count-down timer that counts down from a set time, or the like.

Next, the flow of processing of the power receiving device 101 and the power transmitting device 102 in this embodiment will be described using FIGS. 4 to 8. FIG. FIG. 4 is an operation sequence diagram of the power receiving apparatus 101 and the power transmitting apparatus 102 according to this embodiment. FIG. 5 is a flowchart showing a method of controlling the power receiving device 101 according to this embodiment. 6A and 6B are operation flowcharts of processing for switching the NFC function control authority of the power receiving apparatus 101 to the first control unit 201 according to the present embodiment. 7A and 7B are operation flowcharts of processing for switching the NFC function control authority of the power receiving apparatus 101 to the third control unit 203 according to the present embodiment. FIG. 8 is a flowchart showing a control method for the power transmission device 102 according to this embodiment.

The NFC function of the power receiving device 101 in this embodiment is controlled by the third control unit 203 during normal operation, that is, when the remaining charge level of the power receiving device 101 exceeds the threshold. On the other hand, for example, when the remaining charge level of the power receiving apparatus 101 falls below the threshold, the third control unit 203 stops to suppress power consumption, and the first control unit 201 operates so as to perform power receiving processing. may continue. At this time, in step F501 of FIG. 5, the power receiving apparatus 101 detects the operating state of the third control unit 203, and switches so that the NFC function control is performed by the second control unit 202 according to the operating state.

The trigger for detecting the operating state of the third control unit 203 may be a push type in which the first control unit 201 receives an NFC function control request, or a push type trigger in which the first control unit 201 detects the operating state of the third control unit 203. Any of the pull types that you get will work. In the case of the push type, as an example, in step S401 of FIG. An NFC function control request is transmitted to the first control unit 201 .

At step F601 in FIG. 6A, when the first control unit 201 receives the NFC function control request from the third control unit 203, the process proceeds to step F602. In step F602 of FIG. 6A and step S402 of FIG. 4, the first control unit 201 returns ACK to the third control unit 203.

The method by which the first control unit 201 receives the NFC function control request is not limited to this. For example, the charging unit 209 may notify the first control unit 201 of the remaining charge of the power receiving apparatus 101, and the first control unit 201 may determine switching of NFC function control according to the remaining charge.

After that, in step S403 of FIG. 4 and step F603 of FIG. 6A, the first control unit 201 asks the second control unit 202 to check whether the NFC function is operating. Submit a notification request.

In step S404 of FIG. 4, when the second control unit 202 receives the NFC function operating state notification request during operation, the NFC function indicating whether the NFC function is operating is sent to the first control unit 201. Return the NFC function operation status notification including the function operation information.

In step F604 of FIG. 6A, the first control unit 201 confirms the NFC function operation status notification received from the second control unit 202, and updates the NFC function operation information held by the second control unit 202 itself. .

At step F605 in FIG. 6A, the first control unit 201 ends the switching process when the NFC function is operating. Further, when the NFC function is not operating, the first control unit 201 returns to step F603 and, since there is a possibility that the NFC function will operate before the power receiving process starts, Obtain NFC function operation information periodically. At this time, if the NFC function operating state notification from the second control unit 202 is not returned for a certain period of time due to reasons such as the second control unit 202 being stopped, the first control unit 201 It may be determined that the NFC function is stopped. Also, the method by which the first control unit 201 acquires the operating state of the NFC function is not limited to this. For example, a method of including information on the NFC function operating state held by the third control unit 203 in the NFC function control request and transmitting the NFC function control request may be used. In addition, the information may be obtained from any component that is connected to the first control unit 201 via a communication interface and is capable of data communication.

In the case of the pull type, in step F606 of FIG. 6B, the first control unit 201 periodically acquires the operating state of the third control unit 203 by timer control or the like. First control unit 201 transmits an operating state acquisition request to third control unit 203 . The third control unit 203 returns ACK to the first control unit 201 when it acquires an operation state acquisition request during operation.

In step F607 of FIG. 6B, when ACK is returned from the third control unit 203, the first control unit 201 determines that the third control unit 203 is operating, and returns to step F606. . On the other hand, when the third control unit 203 is stopped, the third control unit 203 cannot return ACK. The first control unit 201 determines that the third control unit 203 is stopped when an ACK is not returned for a certain period of time after transmitting the operating state acquisition request, and controls the NFC function to the first control unit 201 . The control unit 201 itself determines that the processing is to be performed, and the process proceeds to step F603. The subsequent steps F603-F605 of FIG. 6B are similar to the push-type steps F603-F605 of FIG. 6A.

Note that the method of determining which of the first control unit 201 and the third control unit 203 controls the NFC function by the NFC function switching process is not limited to this. For example, the power receiving apparatus 101 may determine which of the first control unit 201 and the third control unit 203 controls the NFC function based on the detection state and charging state of the power transmitting apparatus 102 . As an example, when the power receiving device 101 detects the power transmitting device 102, the first control unit 201 may switch to control the NFC function. When the state of charge of the power receiving apparatus 101 is equal to or higher than the threshold, the power receiving apparatus 101 switches so that the third control unit 203 controls the NFC function. A method of switching such that one control unit 201 controls the NFC function may also be used.

According to the flow of processing up to this point, it is possible to switch the control right of the NFC function so that the first control unit 201 controls the NFC function based on the operation states of the power receiving apparatus 101 and the third control unit 203. It becomes possible.

In step S405 of FIG. 4 and step F801 of FIG. 8, the power transmitting apparatus 102 always enables/disables the NFC function in order to prevent damage to the NFC tag 103 when the device to which power is to be transmitted has the NFC function. NFC function detection processing for confirmation is performed. Specifically, the power transmitting apparatus 102 emits a carrier wave for detecting the NFC function, and the NFC device that receives the carrier wave returns a response. The power transmission device 102 performs the processing as polling processing. Further, the processing is periodically executed by timer control or the like. In response to this, when the NFC communication unit 204 receives the carrier wave, the power receiving apparatus 101 returns a response to the carrier wave to notify that a device equipped with the NFC function is nearby.

In step S406 of FIG. 4, the power transmitting apparatus 102 can detect that an NFC device is nearby when the power receiving apparatus 101, whose NFC function is enabled by the above processing, is brought closer to the power transmitting apparatus 102.

Further, in step F802 of FIG. 8, the power transmission unit 303 starts detection processing of the power receiving apparatus 101. Specifically, in step S407 of FIG. 4 , the power transmission unit 303 transmits Analog Ping via the power transmission coil 305 . Analog Ping is a minute power signal for detecting an object existing near the power transmission coil 305 . When the power transmission device 102 is transmitting Analog Ping, the power transmission device 102 is in a state called Selection phase. The power transmission device 102 detects the voltage value or current value of the power transmission coil 305 when the analog ping is transmitted, and if the voltage value is below the threshold value or the current value is above the threshold value, an object is detected around the power transmission coil 305. exists, and transitions to the Ping phase.

In step S408 of FIG. 4, in the Ping phase, the power transmission device 102 transmits a Digital Ping that is greater than the Analog Ping. In step F502 of FIG. 5, the first control unit 201 receives Digital Ping via the power receiving coil 206. FIG.

Then, in step S409 of FIG. 4 and step F503 of FIG. 5, the first control unit 201 detects that the power transmission device 102 exists nearby. When the NFC function is operating, the first control unit 201 disables and enables the NFC function in order to prevent transmission power from being reduced due to detection of the NFC function by the power transmission device 102 . enforce a ban on Specifically, in step S410 of FIG. 4, the first control unit 201 transmits an NFC function disabling and prohibition request to the second control unit 202. FIG.

In step S411 of FIG. 4 and step F504 of FIG. 5, upon receiving the NFC function disabling and prohibition request, the second control unit 202 performs NFC function disabling and enabling prohibition processing. As a method of disabling the NFC function, the second control unit 202 does not return a response to the function detection processing from the power transmitting apparatus 102 in step S405 of FIG. 4 and step F801 of FIG. stop supplying power to

In this embodiment, as an example, the flow of processing from the execution of the NFC function control switching processing in step F501 to the execution of the NFC function invalidation and prohibition processing in step F504 is shown. is not limited to For example, if the NFC function control switching process in step F501 is push type, the timing of receiving the NFC function control request in step F601 can be any timing during the power reception process. If the power receiving apparatus 101 detects the power transmitting apparatus 102 in step F503 without receiving an NFC function control request, the power receiving apparatus 101 determines that the power receiving apparatus 101 is operating normally, that is, that the remaining charge level exceeds the threshold, and performs the third control. The unit 203 requests disabling and prohibition of the NFC function in step F504. After that, when the power receiving apparatus 101 receives an NFC function control request, the NFC function control switching process is performed according to the flow of processes shown in FIGS. 6A and 6B.

Further, when the NFC function control switching process in step F501 is of the pull type, the method is not limited to the method of periodically acquiring the operating state of the third control unit 203 by the timer control or the like described above. For example, the power receiving apparatus 101 may perform pull-type NFC function control switching processing at the timing when the power transmitting apparatus 102 is detected. Even in this case, either the first control unit 201 or the third control unit 203, which is determined by the NFC function control switching process, requests the NFC function to be disabled or prohibited.

Note that when the third control unit 203 controls the NFC function, the third control unit 203 controls the NFC function based on the power transmission device detection notification from the first control unit 201 . In step F502 of FIG. 5, the first control unit 201 receives Digital Ping via the power receiving coil 206. FIG.

Then, in step S409 of FIG. 4 and step F503 of FIG. 5, the first control unit 201 detects that the power transmission device 102 exists nearby. At this time, the first control unit 201 checks whether the first control unit 201 itself is controlling the NFC function, and if the third control unit 203 is controlling the NFC function, transmits a power transmission device detection notification to the third control unit 203 . When the third control unit 203 receives the power transmitting device detection notification transmitted from the first control unit 201, the third control unit 203 controls the NFC function.

In step S412 of FIG. 4 and step F505 of FIG. 5, second control unit 202 sends the aforementioned NFC function operation information to first control unit 201 after completing the NFC function disabling and prohibition processing. return the NFC function operation status notification including; At this time, if the first control unit 201 cannot receive the NFC function operating state notification from the second control unit 202 even after waiting for a certain period of time, the first control unit 201 determines that the second control unit 202 has stopped together with the NFC function. and continue the power receiving process. In step S410 , the first control unit 201 may process the NFC function disabling and prohibition by itself without transmitting the NFC function disabling and prohibition request to the second control unit 202 . In that case, the first control unit 201 may notify the second control unit 202 that the NFC function disabling and prohibition processing has been performed. In step S412, when the second control unit 202 receives from the first control unit 201 the notification that the NFC function has been disabled and prohibited, the second control unit 202 returns an NFC function operation state notification including the NFC function operation information. You may Note that the timing at which the first control unit 201 performs the NFC function disabling and prohibition processing is not limited to the timing described above. This may be performed at any timing until the power receiving apparatus 101 starts adjusting the received power with the power transmitting apparatus 102 using a Specific Request packet, that is, between steps S409 to S417.

After that, in step S413 of FIG. 4 and step F506 of FIG. Then, the first control unit 201 transitions to Identification & Configuration (hereinafter referred to as I & C phase). Here, the aforementioned notification of the magnitude of the voltage that can be received is performed by communication via the WPC communication unit 205 and the control unit 301 . The power transmission device 102 transitions to the I&C phase upon receiving the magnitude of the voltage that can be received.

Subsequently, the power receiving apparatus 101 notifies the power transmitting apparatus 102 of the manufacturer code indicating its own manufacturer and device identification information. Specifically, in steps S414 and S415 of FIG. 4 and steps F507 and F508 of FIG. Send to In steps F803 and F804 of FIG. 8, the power transmission device 102 receives the ID Packet and Configuration Packet.

In step F805 of FIG. 8, the power transmitting apparatus 102 receives the Configuration Packet and confirms whether the power receiving apparatus 101 supports the Negotiation phase. The power transmitting apparatus 102 proceeds to step F806 if it is compatible, and proceeds to step F818 if it is not compatible.

In step S416 of FIG. 4 and step F806 of FIG. 8, if the power transmitting apparatus 102 determines that the power transmitting apparatus 102 is compatible, it transmits to the power receiving apparatus 101 an ACK indicating acceptance of the approval, transitions to the Negotiation phase, The process proceeds to step F807.

In step F509 of FIG. 5, when the power receiving apparatus 101 receives the above ACK, it transitions to the Negotiation phase and proceeds to step F510. If the power receiving apparatus 101 cannot receive the above ACK, it determines that the power transmitting apparatus 102 does not support the Negotiation phase and the Calibration phase, and proceeds to step F526. In step F526 of FIG. 5, the first control unit 201 confirms reception of 5 watts of power, and proceeds to step F518. In step F818 of FIG. 8, the power transmission device 102 confirms power transmission of 5 watts, and proceeds to step F812.

In the Negotiation phase, the power transmitting apparatus 102 and the power receiving apparatus 101 negotiate to determine the Guaranteed Power (hereinafter referred to as GP) indicating the amount of power that the power receiving apparatus 101 can always receive. Specifically, the power receiving apparatus 101 notifies the power transmitting apparatus 102 of the GP candidate values using a Specific Request packet. The power transmission device 102 will accept or reject the above notification.

In step S417 of FIG. 4, step F510 of FIG. 5, and step F807 of FIG. The maximum 15 watts is notified to the power transmission device 102 as a candidate for . The first control unit 201 waits for an ACK or NACK response from the power transmission device 102 .

In step F511 of FIG. 5, when the first control unit 201 receives ACK as a response, it means that the validity of the power transmission device 102 is confirmed, so the process proceeds to step F527 and receives ACK as a response. If not, the process proceeds to step F512.

In step F512, if the first control unit 201 receives a NACK as a response, it proceeds to step F513. and proceed to step F522.

In step F527 in FIG. 5, the power receiving apparatus 101 confirms power reception of 15 watts, and proceeds to step F517.

The power transmission device 102 has a power value threshold that does not damage the NFC tag 103, because the NFC tag 103 may be damaged when high-output power is transmitted as described above. Here, the threshold is set to 5 watts. The power transmitting device 102 that has received the 15-watt power transmission request is in a state in which it detects the NFC function. Therefore, the power transmission device 102 determines that the NFC tag 103 may be damaged if power transmission of 15 watts, which is power equal to or higher than the threshold, is performed.

In step F807 of FIG. 8, the power transmitting apparatus 102 proceeds to step F808 if the candidate for the GP power request is equal to or greater than the threshold, and proceeds to step F815 if the candidate for the GP power request is less than the threshold. move on.

In step F808, if the power transmitting apparatus 102 detects an NFC device, the process proceeds to step F817; otherwise, the process proceeds to step F809. In step S418 of FIG. 4 and step F817 of FIG. 8, the power transmission device 102 responds NACK to the first control unit 201 to reject this, and returns to step F807.

In step F512 of FIG. 5, when the first control unit 201 receives the above NACK, it determines that the power transmitting apparatus 102 has not detected that the NFC function has been disabled in the power receiving apparatus 101 (S411 and F504). and proceed to step F513.

In step F513, if the first control unit 201 has not received NACK a certain number of times or more, it proceeds to step F510 in FIG. 5 and S421 in FIG. 4 to request 15-watt power supply again. Note that when the first control unit 201 receives NACK a certain number of times or more, it determines that there is a reason why the power transmission device 102 cannot handle power transmission of 15 watts, and proceeds to step F514.

In step F514, the first control unit 201 requests the power transmission device 102 to receive power of 5 watts as a GP candidate. In step F815 in FIG. 8, the power transmitting apparatus 102 transmits ACK to the power receiving apparatus 101 in response to the request, and proceeds to step F816. In step F515 of FIG. 5, the first control unit 201 proceeds to step F516 if an ACK has been received from the power transmitting device 102 in response to the request, and proceeds to step F516 if an ACK has not been received from the power transmitting device. 102, and proceeds to step F522.

At step F516 in FIG. 5, the first control unit 201 confirms reception of 5 watts of power. In step F816 in FIG. 8, the power transmitting device 102 confirms power transmission of 5 watts.

Specifically, the reason why the power transmission device 102 side cannot support power transmission of 15 watts is when the power transmission device 102 detects an NFC tag 103 other than the NFC communication unit of the power reception device 101 (not battery driven). After the power receiving apparatus 101 disables its own NFC communication unit, the power transmitting apparatus 102 detects the NFC tag 103 other than the NFC communication unit of the power receiving apparatus 101 (not battery-powered) by receiving NACKs a certain number of times or more. can be judged. Then, in step F516 of FIG. 5, the first control unit 201 can determine transmission of 5 watts, which is power that does not affect the NFC tag 103 .

In step S419 of FIG. 4 and step F801 of FIG. 8, the power transmission device 102 performs the regular NFC function detection process described above. In step S420 of FIG. 4 and step F808 of FIG. Detects that the NFC function has been disabled. The process proceeds to step F809.

In step S421 of FIG. 4 and step F510 of FIG. 5, the first control unit 201 again supplies the charging unit 209 with enough power to output 15 watts of power. 15 watts is notified to the power transmission device 102 .

In step S422 of FIG. 4 and step F809 of FIG. 8, the power transmitting apparatus 102 can accept a maximum GP value of 15 watts. do.

At step F511 in FIG. 5, the first control unit 201 proceeds to step F527 by receiving ACK. In step F527 of FIG. 5, the first control unit 201 confirms the power reception of 15 watts, and proceeds to step F517. In step F810 of FIG. 8, the power transmission device 102 confirms power transmission of 15 watts, and proceeds to step F811.

When the GP negotiation is completed, in step S423 of FIG. 4, step F517 of FIG. 5, and step F811 of FIG. In the calibration phase, the power transmitting device 102 determines parameters necessary for a foreign object detection function that detects the presence of an object other than the power receiving device 101 near the power transmitting coil 305 .

After that, in step S424 in FIG. 4, step F518 in FIG. 5, and step F812 in FIG. 8, the power transmission device 102 and the first control unit 201 transition to the Power Transfer phase.

In step F519 of FIG. 5, the first control unit 201 starts charging the battery 210. In step F520 of FIG. 5, when the charging of the battery 210 is completed, the first control unit 201 proceeds to step F521.

In step S425 of FIG. 4 and step F521 of FIG. In step F813 of FIG. 8, when the power transmission device 102 receives the End Power Transfer packet, the process proceeds to step F814. In step F814 , the power transmitting apparatus 102 stops power transmission to the power receiving apparatus 101 .

In step S426 of FIG. 4 and step F522 of FIG. 5, the first control unit 201 transmits to the second control unit 202 a NFC function enablement and prohibition release request after completing the charging. In step S427 of FIG. 4, the second control unit 202, upon receiving the NFC function activation and prohibition release request, performs NFC function activation and prohibition release processing. In step S428 of FIG. 4, the second control unit 202, after completing the execution of the NFC function activation and prohibition release processing, sends the NFC function operation state including the NFC function operation information to the first control unit 201. Reply notification.

At this time, if the first control unit 201 cannot receive the notification of the NFC function operating state from the second control unit 202 even after waiting for a certain period of time, the second control unit 202 is stopped, and the NFC function is also disabled. It may determine that it remains disabled and update the NFC feature operational state. In step S426 of FIG. 4, the first control unit 201 performs the NFC function activation and prohibition release processing by itself without transmitting the NFC function activation and prohibition release request to the second control unit 202. You may In that case, the first control unit 201 may notify the second control unit 202 that the NFC function activation and prohibition release processing have been performed. In step S428, when the second control unit 202 receives from the first control unit 201 the notification that the NFC function activation and prohibition release processing has been performed, the second control unit 202 instructs the first control unit 201 to operate the NFC function. An NFC function working status notification containing the information may be returned.

　After that, in step F523 of FIG. The third control unit 203 returns ACK to the first control unit 201 when it acquires an operation state acquisition request during operation.

In step F524 of FIG. 5, when ACK is returned from the third control unit 203, the first control unit 201 determines that the third control unit 203 is operating, and proceeds to step F525. . Further, when ACK is not returned from the third control unit 203, the first control unit 201 determines that the third control unit 203 is not operating, and terminates the processing in FIG.

In step S429 of FIG. 4 and step F525 of FIG. 5, the first control unit 201 transmits an NFC function control return request to the third control unit 203. At this time, the first control unit 201 transmits the NFC function control return request including the NFC function operation information held during the power reception process. Alternatively, first control unit 201 may transmit NFC function operation information to third control unit 203 separately from the NFC function control return request. As a result, it is possible to prevent an error in the control content of the NFC function when switching the control right of the NFC function from the first control unit 201 to the third control unit 203 .

After that, in step S430 of FIG. 4, when the NFC function control return request is received during operation, the third control unit 203 can perform the NFC control. , ACK is returned.

If for some reason ACK is not returned from the third control unit 203 for a certain period of time, the first control unit 201 determines that the third control unit 203 is stopped, and may retain control. The trigger for determining whether first control unit 201 issues an NFC function control return request to third control unit 203 is not limited to this.

For example, as shown in FIGS. 7A and 7B, the operating state of the third control unit 203 may be obtained and determined in a push-type or pull-type manner without depending on the completion of charging in step F520 of FIG. In the case of the push type, as an example, the third control unit 203 operates when the state of charge of the power receiving apparatus 101 exceeds the lower limit threshold through data communication with the charging unit 209 as a trigger. A third control unit operation notification including information is transmitted to the first control unit 201 . Upon receiving the third control unit operation notification in step F701 of FIG. 7A, the first control unit 201 confirms the operation information of the third control unit 203 in step F702 of FIG. 7A.

Note that the method by which the first control unit 201 receives the third control unit operation notification is not limited to this. For example, the charging unit 209 notifies the first control unit 201 of the remaining charge of the power receiving apparatus 101, and the first control unit 201 determines whether the third control unit 203 is operating according to the remaining charge. You may When the third control unit 203 is operating, the first control unit 201 performs the processing of step F703 in FIG. 7A to confirm whether the NFC function is operating. In step F703 , the first control unit 201 transmits an NFC function operating state notification request to the second control unit 202 . When the second control unit 202 receives the NFC function operation state notification request during operation, the second control unit 202 sends the NFC function including NFC function operation information indicating whether the NFC function is operating to the first control unit 201 . Reply the operation status notification. In step F704 of FIG. 7A , the first control unit 201 transmits the NFC function control return request including the second control unit operation information based on the NFC function operation state notification received from the second control unit 202 to the third control unit. It is transmitted to the control unit 203 . Upon receiving the NFC function control return request, the third control unit 203 returns ACK to the first control unit 201 and ends the process. As a result, the third control unit 203 can acquire the operation state of the NFC function at the time when the NFC function control right is returned to itself, so that subsequent control of the NFC function can be performed smoothly.

After determining the operation of the third control unit 203 in step F702, the first control unit 201 acquires the NFC function operation information in step F703, and issues the NFC function control return request in step F704. , but not limited to. The first control unit 201 holds the operating state of the third control unit 203, acquires the NFC function operation information in step F703, and obtains the NFC function operation information in step F704 at any timing until the power receiving process is completed. An NFC function control return request may be issued.

In the case of the pull type, in step F705 of FIG. 7B, the first control unit 201 periodically acquires the operating state of the third control unit 203 by timer control or the like. First control unit 201 transmits an operating state acquisition request to third control unit 203 . The third control unit 203 returns ACK to the first control unit 201 when it acquires an operation state acquisition request during operation. When ACK is returned from the third control unit 203, the first control unit 201 determines that the third control unit 203 is operating. On the other hand, the third control unit 203 cannot return ACK to the first control unit 201 when stopped. In step F706 in FIG. 7B, the first control unit 201 determines that the third control unit 203 is stopped if ACK is not returned for a certain period of time after transmitting the operation state acquisition request, It is determined that the first control unit 201 itself continues to control the NFC function. The subsequent steps F703 and F704 of FIG. 7B are similar to steps F703 and F704 of FIG. 7A for the push type.

In the present embodiment, as an example, from the completion of charging in step F520 in FIG. 5 to acquiring the third control unit operation state in step F523 and, if necessary, performing the NFC function control switching process in step F525. , but is not limited to this. For example, when the operating state of the third control unit 203 is acquired by push type, the timing of receiving the NFC function control request in step F601 of FIG. 6A can be any timing during the power reception process. When the power receiving apparatus 101 receives the third control unit operation notification in step F701 in FIG. 7A while charging is not completed, the third control unit 203 activates the NFC function according to the processing in steps F702 to F704. Switch to control. In this case, in step F522 of FIG. 5, the third control unit 203 executes the NFC function activation and prohibition release request processing.

In addition, when the operating state of the third control unit 203 is acquired by the pull type, the method is not limited to the method of periodically acquiring the operating state of the third control unit 203 by timer control or the like described above. For example, the power receiving apparatus 101 may acquire the third control unit operating state in step F705 of FIG. 7B at the timing when charging is completed. After that, the control unit that has been determined to control the NFC function of either the first control unit 201 or the third control unit 203 executes the processing of the NFC function activation and prohibition cancellation request.

In addition, when the third control unit 203 controls the NFC function, the third control unit 203 receives the charging completion notification (or the notification indicating that no power is being received) from the first control unit 201 to perform the NFC function. Implement control of functions. The first control unit 201 transmits an End Power Transfer packet to the power transmission device 102 upon completion of charging. At this time, the first control unit 201 checks whether the first control unit 201 itself is controlling the NFC function, and if the third control unit 203 is controlling the NFC function, , the charging completion notification is transmitted to the third control unit 203 . When the third control unit 203 receives the charging completion notification transmitted from the first control unit 201, the third control unit 203 controls the NFC function.

With the flow of processing up to this point, the power receiving apparatus 101 can switch control of the NFC function from the first control unit 201 to the third control unit 203 based on the operating state of the third control unit 203. becomes.

In the present embodiment, the WPC communication unit 205 of the power receiving apparatus 101 realizes the power determination. You may

As described above, the power receiving apparatus 101 wirelessly receives power from the power transmitting apparatus 102 . The first control unit 201 controls processing related to power reception with the power transmission device 102 . The second control unit 202 controls the NFC (Near Field Communication) function. A third control unit 203 controls the entire power receiving apparatus 101 . The first controller 201 controls the operation of the second controller 202 based on the operating state of the third controller 203 .

In step S401 of FIG. 4, the first control unit 201 stops the third control unit 203 when the remaining charge amount of the battery 210 of the power receiving apparatus 101 is less than the threshold. 203 to receive an NFC function control request. At step S410 in FIG. 4, the first control unit 201 controls the second control unit 202 to disable the NFC function. In steps S421 to S424 of FIG. 4, the first control unit 201 performs control to wirelessly receive power from the power transmission device . That is, when the third control unit 203 is in the stopped state, the first control unit 201 can perform the processing after step S410 in FIG.

At step F520 in FIG. 5, when the charging of the battery 210 is completed, the first control unit 201 proceeds to step F521.

In step S425 of FIG. 4, the first control unit 201 transmits an End Power Transfer packet to the power transmission device 102. In step S426 of FIG. 4, the first control unit 201 controls the second control unit 202 to enable the NFC function when the reception of power from the power transmission device 102 ends.

After step S430 in FIG. 4, the first control unit 201 does not control the operation of the second control unit 202, and the third control unit 203 controls the operation of the second control unit 202.

Note that, when the operation mode of the third control unit 201 transitions to the low power mode, the first control unit 201 performs the processes after step S403 and controls the operation of the second control unit 202. good. Also, the first control unit 201 can control the operation of the second control unit 202 when the operation of the third control unit 203 is stopped.

Further, when there is no reply from the third control unit 203 in response to the inquiry about the operation state of the third control unit 203, the first control unit 201 performs the processing after step S403 in FIG. You may control the operation|movement of the 2nd control part 202. FIG. When there is a reply from the third control unit 203 in response to the inquiry about the operating state of the third control unit 203, the first control unit 201 causes the second control unit 202 to The third control unit 203 may control the operation of the second control unit 203 without controlling the operation.

In step S401 of FIG. 4, the first control unit 201 receives the NFC function control request from the third control unit 203 when the remaining charge amount of the battery 210 of the power receiving apparatus 101 is smaller than the threshold, and controls the operation of the control unit 202 of .

At step F520 in FIG. 5, when the charging of the battery 210 is completed, the first control unit 201 proceeds to step F521. In step S425 of FIG. 4 and step F521 of FIG. If the remaining charge level of the battery 210 of the power receiving apparatus 101 is greater than the threshold, the first control unit 201 does not control the operation of the second control unit 202 after step S430 in FIG. A unit 203 controls the operation of the second control unit 202 .

Further, when the third control unit 203 is activated, the first control unit 201 does not control the operation of the second control unit 202 after step S430 in FIG. It controls the operation of the second control unit 202 .

Before step S401 and after step S430 in FIG. 4, the third control unit 203 is in operation, so the first control unit 201 does not control the operation of the second control unit 202. A third controller 203 controls the operation of the second controller 202 .

In steps S403 to S428 in FIG. 4, since the third control unit 203 is in the stopped operating state, the third control unit 203 does not control the operation of the second control unit 202, and the first control unit 201 controls the operation of the second control unit 202 .

After detecting the power transmission device 102 in step S409 of FIG. 4, the first control unit 201 controls the second control unit 202 to disable the NFC function in step S410 of FIG. In S424 , control is performed to wirelessly receive power from the power transmission device 102 .

After receiving the Digital Ping from the power transmission device 102 in step S408 of FIG. 4, the first control unit 201 controls the second control unit 202 to disable the NFC function in step S410 of FIG. Also, after step S410 in FIG. 4, the first control unit 201 transmits the Signal Strength Packet to the power transmitting device 102 in step S413 in FIG.

With the configuration described above, even when the third control unit 203 that controls the entire power receiving apparatus 101 is stopped due to, for example, a decrease in the remaining charge, the first control unit 201 disables the NFC function. A charging process conforming to the WPC standard can be implemented. Therefore, the power receiving device 101 can receive efficient power supply from the power transmitting device 102 conforming to the WPC standard and equipped with the detection function of the NFC tag 103, thereby shortening the charging time.

The power receiving device 101 is, for example, a smart phone equipped with an NFC function that operates in card emulation mode, and can realize high power power receiving processing even when the third control unit 203 is stopped in the low power mode. .

(Second embodiment)
In the first embodiment, a method has been described in which the power receiving apparatus 101 continues the power receiving process by disabling the NFC function by the second control unit 202 when the power transmitting apparatus 102 is detected. In the second embodiment, a method of continuing power reception processing using WPC communication between the power receiving apparatus 101 and the power transmitting apparatus 102 without disabling the NFC function in the power receiving apparatus 101 will be described.

The configuration of the wireless power transmission system 100 of the second embodiment is the same as that of the first embodiment in FIG. 1 described above. The configurations of the power receiving device 101 and the power transmitting device 102 shown in FIG. 1 are the same as the configurations shown in FIGS. 2 and 3, so description thereof is omitted.

Next, the flow of processing of the power receiving apparatus 101 and the power transmitting apparatus 102 in this embodiment will be described using FIGS. 9 to 11. FIG. FIG. 9 is an operation sequence diagram of the power receiving apparatus 101 and the power transmitting apparatus 102 according to this embodiment. FIG. 10 is a flowchart showing a method for controlling the power receiving device 101 according to this embodiment. FIG. 11 is a flowchart showing a control method for the power transmission device 102 according to this embodiment.

The power receiving apparatus 101 performs the processing of steps S901 to S904 in FIG. 9 and step F1001 in FIG. The process of step F1001 in FIG. 10 is a process of switching the NFC function control from the third control unit 203 of the power receiving apparatus 101 to the first control unit 201, and is the same as the process of step F501 in FIG. The processing of steps S901-S904 in FIG. 9 is the same as the processing of steps S401-S404 in FIG.

In step S905 of FIG. 9 and step F1101 of FIG. 11, the power transmitting device 102, as in the first embodiment, always checks whether the NFC function is enabled or disabled in order to prevent the NFC tag 103 from being damaged. Start the detection process. Specifically, the power transmitting apparatus 102 emits a carrier wave for detecting the NFC function (NFC device), and the NFC device that receives the carrier wave returns a response. In response, when power receiving apparatus 101 receives the carrier wave at NFC communication unit 204, power receiving apparatus 101 transmits the above response to the carrier of

In step S906 of FIG. 9, the power transmitting apparatus 102 can detect that one NFC device is nearby when the power receiving apparatus 101 whose NFC function is enabled by the above processing is brought closer to the power transmitting apparatus 102. can. At this time, when the NFC function detection is performed, the power transmitting apparatus 102 holds the NFC function detection result information in the memory 309 . The NFC function detection result information shown here includes at least whether the NFC function detection process has been performed and the number of detected NFC functions. Each time the power transmitting apparatus 102 performs NFC function detection, the NFC function detection result information held in the memory 309 may be held in another memory area or overwritten.

In step F1102 of FIG. 11 , the power transmission unit 303 starts detection processing of the power receiving apparatus 101 . Specifically, in step S907 of FIG. 9 , the power transmission unit 303 transmits Analog Ping via the power transmission coil 305 . The power transmission device 102 detects the voltage value or current value of the power transmission coil 305 when the analog ping is transmitted, and if the voltage value is below the threshold value or the current value is above the threshold value, an object is detected around the power transmission coil 305. exists, and transitions to the Ping phase.

In step S908 of FIG. 9, in the Ping phase, the power transmission device 102 transmits a Digital Ping that is greater than the Analog Ping. In step F1002 of FIG. 10, the first control unit 201 receives power from Digital Ping via the power receiving coil 206. FIG. Then, in step S909 of FIG. 9 and step F1003 of FIG. 10, the first control unit 201 detects that the power transmission device 102 exists nearby.

　After that, in step S910 of FIG. 9 and step F1004 of FIG. Then, the first control unit 201 transitions to Identification & Configuration (hereinafter referred to as I & C phase). Here, the aforementioned notification of the magnitude of the voltage that can be received is performed by communication via the WPC communication unit 205 and the control unit 301 . The power transmission device 102 transitions to the I&C phase upon receiving the notification of the voltage at which power can be received.

Subsequently, the power receiving apparatus 101 notifies the power transmitting apparatus 102 of the manufacturer code indicating its own manufacturer and device identification information. In steps S911 and S912 in FIG. 9 and steps F1005 and F1006 in FIG. 10, the first control unit 201 transmits to the power transmission device 102 an ID packet and a configuration packet including the version of the standard it complies with. In steps F1103 and F1104 of FIG. 11, the power transmission device 102 receives the ID Packet and Configuration Packet.

In step F1105 of FIG. 11, the power transmitting apparatus 102 receives the above Configuration Packet, and confirms whether the power receiving apparatus 101 supports the Negotiation phase. The power transmitting apparatus 102 proceeds to step F1106 if it is compatible, and proceeds to step F1122 if it is not compatible.

In step S913 of FIG. 9 and step F1106 of FIG. 11, if the power transmitting apparatus 102 determines that the power transmitting apparatus 102 is compatible, it transmits to the power receiving apparatus 101 an ACK indicating acceptance of the approval, and transitions to the Negotiation phase.

In step F1007 of FIG. 10, when the first control unit 201 receives the above ACK, it transitions to the Negotiation phase and proceeds to step F1008. Further, when the above ACK cannot be received, the first control unit 201 determines that the power transmission device 102 does not support the Negotiation phase and the Calibration phase, and proceeds to step F1024.

In step F1024 of FIG. 10, the first control unit 201 confirms that 5 watts of power has been received, and proceeds to step F1016. In step F1122 of FIG. 11, the power transmission device 102 confirms power transmission of 5 watts, and proceeds to step F1114.

In the Negotiation phase, the power transmitting apparatus 102 and the power receiving apparatus 101 negotiate to determine the Guaranteed Power (hereinafter referred to as GP) indicating the amount of power that the power receiving apparatus 101 can always receive. At the same time, in the present embodiment, the power transmitting apparatus 102 notifies the power receiving apparatus 101 of the NFC function detection result by the power transmitting apparatus 102, thereby negotiating whether to continue processing.

In step S914 of FIG. 9 and step F1107 of FIG. 11, the power transmitting apparatus 102 transmits the above ACK, and subsequently transmits the NFC function detection result information held in the memory 309 to the power receiving apparatus 101 in step S906. In step F1008 of FIG. 10, upon receiving the NFC function detection result, the first control unit 201 confirms the number of NFC functions detected by the power transmission device 102 included in the NFC function detection result information.

In step F1009 of FIG. 10, when the number of NFC functions detected by the power transmission device 102 is 0, the first control unit 201 determines that there is no NFC device near the power transmission device 102, and proceeds to step F1013. If the number of NFC functions detected by the power transmission device 102 is one or more, the first control unit 201 proceeds to step F1010.

In step F1010 of FIG. 10, when the number of NFC functions detected by the power transmission device 102 is 1, the first control unit 201 proceeds to step F1011. Further, when the number of NFC functions detected by the power transmission device 102 is greater than 1, the first control unit 201 determines that, for example, the NFC tag 103 other than the power reception device 101 is near the power transmission device 102, and proceeds to step F1025. move on.

In step F1011 of FIG. 10, the first control unit 201 acquires from the second control unit 202 the NFC function operating state for checking whether the card emulation mode using the NFC function is operating in the power receiving apparatus 101. do. Specifically, in step S915 in FIG. 9 , the first control unit 201 transmits a request for notification of the NFC function operating state to the second control unit 202 . Then, in step S916 in FIG. 9 , the second control unit 202 transmits the NFC function operating state notification to the first control unit 201 . Thereby, the first control unit 201 acquires the NFC function operating state.

In step F1012 of FIG. 10 , the first control unit 201 controls the power receiving apparatus 101 to perform NFC communication in the power transmitting apparatus 102 when the NFC function is operating in the power receiving apparatus 101, that is, when the card emulation mode is operating. It is judged that it has been detected as having a function. The first control unit 201 then notifies the power transmitting apparatus 102 that the NFC function operating in the power receiving apparatus 101 is in the card emulation mode. Specifically, an NFC CE Supported bit indicating whether or not the card emulation mode is supported is provided in the reserved area of the Specific Request packet. The first control unit 201 sets the NFC CE Supported bit to 1 when the card emulation mode is operating, and sets the NFC CE Supported bit to 0 when the card emulation mode is not operating. After that, the process proceeds to step F1013 in FIG.

It should be noted that the combination of the operating state of the card emulation mode and the setting value for the NFC CE Supported bit may be reversed. Also, the information associated with the bits provided in the reserved area of the Specific Request packet is not limited to whether or not the card emulation mode is supported. For example, it may be whether or not it is an NFC tag. Further, whether or not the mobile device has the NFC function, whether or not the card emulation mode is in operation, whether the NFC function is in operation, and other information regarding the NFC function different from the NFC tag in the power receiving apparatus 101. Any display may be used as long as it indicates the operation status.

In step F1012 of FIG. 10, the first control unit 201 causes the power receiving apparatus 101 to activate the NFC function in the power transmitting apparatus 102 when the NFC function is not operating in the power receiving apparatus 101, that is, when the card emulation mode is not operating. It is determined that it has been detected that it does not have. In this case, the first control unit 201 determines that the NFC tag 103 other than the power receiving device 101 is near the power transmitting device 102 . After that, the process proceeds to step F1025 in FIG.

In step S917 of FIG. 9 and step F1013 of FIG. 10, the first control unit 201 transmits a Specific Request packet in which the NFC CE Supported bit is set to the power transmission device 102 at 15 watts. After that, the process proceeds to step F1014.

In step F1108 of FIG. 11, the power transmission device 102 receives the Specific Request packet. In step S918 of FIG. 9 and step F1109 of FIG. 11, the power transmission device 102 performs the NFC detection function process, as in step S905. At this time, the power transmitting apparatus 102 may refer to the latest NFC function detection result information without executing the NFC detection function process.

In step F1110 of FIG. 11, when the number of detected NFC functions is two or more, the power transmitting apparatus 102 determines that there is an NFC tag other than the power receiving apparatus 101 to which power is to be transmitted, and proceeds to step F1118. If the number of detected NFC functions is less than 2, the power transmitting apparatus 102 proceeds to step F1111.

In step F1111 of FIG. 11, if the number of detected NFC functions is 1, the power transmitting apparatus 102 proceeds to step F1121. Then, regardless of the required power value, the process proceeds to step F1112. In step S919 of FIG. 9, the power transmission device 102 determines that the number of detected NFC functions is one.

At step F1121 in FIG. 11, the power transmitting device 102 refers to the NFC CE Supported bit. When the NFC CE Supported bit is 1, the power transmitting apparatus 102 determines that the detected NFC device is in the card emulation mode that operates within the power receiving apparatus 101, and since the detected target is not an NFC tag, the process proceeds to step F1112. . If the NFC CE Supported bit is 0, the power transmitting apparatus 102 determines that there is an NFC tag other than the power receiving apparatus 101 to which power is to be transmitted, and proceeds to step F1118.

In step F1118 of FIG. 11, the power transmission device 102 determines that the NFC tag can be protected when the power requested by the Specific Request packet is equal to or less than the threshold, and proceeds to step F1112. Also, if the power requested by the above Specific Request packet is greater than the threshold, the power transmitting apparatus 102 determines that the NFC tag may be damaged, and proceeds to step F1119.

In step F1112 of FIG. 11 and step S920 of FIG. 9, the power transmitting apparatus 102 transmits ACK to the above Specific Request packet to the power receiving apparatus 101, and proceeds to step F1113. In step F1113, the power transmitting apparatus 102 determines the transmission power of the above Specific Request packet, and proceeds to step F1114.

In step F1119 of FIG. 11, the power transmission device 102 determines that there is a possibility of damaging the NFC tag, transmits NACK for the above Specific Request packet, and proceeds to step F1120. In step F1120, the power transmission device 102 waits until receiving End Negotiation, and when End Negotiation is received, ends the processing of FIG.

In step F1025 of FIG. 10, the first control unit 201 transmits a Specific Request packet at 5 watts in order to prevent damage to the NFC tag 103 because the NFC tag 103 other than the power receiving device 101 is near the power transmitting device 102. do. After that, the process proceeds to step F1014.

In step F1014 of FIG. 10, when the first control unit 201 receives ACK from the power transmission device 102 in response to the above Specific Request packet, the process proceeds to step F1015. If the first control unit 201 fails to receive an ACK from the power transmission device 102 in response to the Specific Request packet, the process proceeds to step F1026. In step S920 of FIG. 9, the first control unit 201 receives ACK from the power transmission device 102 in response to the above Specific Request packet.

In step F1015 of FIG. 10, the first control unit 201 confirms reception of power requested in the Specific Request packet, and proceeds to step F1016.

In step F1026 of FIG. 10, the first control unit 201 determines that power reception from the power transmission device 102 is impossible, transmits End Negotiation to the power transmission device 102, and proceeds to step F1021.

In step S921 of FIG. 9, step F1016 of FIG. 10, and step F1114 of FIG. 11, the GP negotiation ends, and the power transmission device 102 and the first control unit 201 transition to the Calibration phase. In the calibration phase, the power transmission device 102 determines parameters necessary for a foreign object detection function that detects the presence of an object other than the power reception device 101 near the power transmission coil 305 .

After that, in step S922 of FIG. 9, step F1017 of FIG. 10, and step F1115 of FIG. 11, the power transmission device 102 and the first control unit 201 transition to the Power Transfer phase.

In step F1018 of FIG. 10, the first control unit 201 charges the battery 210. In step F1019 of FIG. 10, after charging the battery 210, the first control unit 201 proceeds to step F1020.

In step F1020 of FIG. 10 and step S923 of FIG. 9, the first control unit 201 transmits an End Power Transfer packet to the power transmission device 102. In step F1116 of FIG. 11, when the power transmission device 102 receives the End Power Transfer packet, the process proceeds to step F1117. In step F1117, the power transmitting apparatus 102 stops power transmission to the power receiving apparatus 101, and the processing in FIG. 11 ends.

In step F1021 of FIG. 10, the first control unit 201 transmits an operating state acquisition request to the third control unit 203. The third control unit 203 returns ACK to the first control unit 201 when it acquires an operation state acquisition request during operation.

In step F1022 of FIG. 10, when ACK is returned from the third control unit 203, the first control unit 201 determines that the third control unit 203 is operating, and proceeds to step F1023. . Further, when ACK is not returned from the third control unit 203, the first control unit 201 determines that the third control unit 203 is not operating, and terminates the processing of FIG.

In step S924 of FIG. 9 and step F1023 of FIG. 10, the first control unit 201 transmits an NFC function control return request to the third control unit 203. At this time, the first control unit 201 transmits the NFC function control return request including the NFC function operation information held during the power reception process. Alternatively, first control unit 201 may transmit NFC function operation information to third control unit 203 separately from the NFC function control return request. As a result, it is possible to prevent an error in the control content of the NFC function when switching the control right of the NFC function from the first control unit 201 to the third control unit 203 .

After that, in step S925 of FIG. 9, when the NFC function control return request is received during operation, the third control unit 203 can perform the NFC control. , ACK is returned.

As described above, the power receiving apparatus 101 wirelessly receives power from the power transmitting apparatus 102 . In step F1008 in FIG. 10 , the first control unit 201 functions as a receiving unit and receives the number of NFC devices detected by the power transmitting device 102 . In steps F1013 and F1025 of FIG. 10, the first control unit 201 controls the number of NFC devices and the operating state of the NFC function of the power receiving apparatus 101 when the third control unit 203 is in the stopped state. , to wirelessly receive power from the power transmission device 102 .

In step F1013, when the number of NFC devices is 1 and the NFC function of the power receiving apparatus 101 is in an operating state, the first control unit 201 wirelessly receives power of 15 watts from the power transmitting apparatus 102. control to Specifically, when the number of NFC devices is 1 and the operating state of the NFC function of the power receiving apparatus 101 is operating in the card emulation mode, the first control unit 201 controls the Control to receive 15 watts of power wirelessly.

In step F1025, when the number of NFC devices is 1 and the NFC function of the power receiving apparatus 101 is in a stopped state, the first control unit 201 wirelessly receives power of 5 watts from the power transmitting apparatus 102. control to Specifically, when the number of NFC devices is 1 and the operation state of the NFC function of the power receiving apparatus 101 is not operating in the card emulation mode, the first control unit 201 controls the power transmitting apparatus 102 to Control to receive 5 watts of power wirelessly.

Also, in step F1013, when the number of NFC devices is 0, the first control unit 201 performs control to wirelessly receive power of 15 watts from the power transmission device 102 . Further, in step F1025, when the number of NFC devices is two or more, the first control unit 201 performs control to wirelessly receive power of 5 watts from the power transmission device 102 .

The power transmission device 102 wirelessly transmits power to the power reception device 101 . In steps S905 and S918 of FIG. 9 and steps F1101 and F1109 of FIG. 11, the power transmission device 102 functions as a detection unit and detects the number of NFC devices. In step S914 of FIG. 9 and step F1107 of FIG. 11, the power transmission device 102 transmits the number of detected NFC devices to the first control unit 201.

In step F1113 in FIG. 11 , the power transmitting apparatus 102 functions as a control unit and wirelessly transmits power to the power receiving apparatus according to the number of detected NFC devices and the operating state of the NFC function of the power receiving apparatus 101 . to control. The power is the requested power of the Specific Request packet.

When the number of detected NFC devices is 1 and the NFC function of the power receiving apparatus 101 is in an operating state, the power transmitting apparatus 102 controls to wirelessly transmit power of 15 watts to the power receiving apparatus 101. do. Specifically, when the number of detected NFC devices is 1 and the operation state of the NFC function of the power receiving apparatus 101 is operating in the card emulation mode, the power transmitting apparatus 102 causes the power receiving apparatus 101 to Control to transmit 15 watts of power wirelessly.

Further, when the number of detected NFC devices is 1 and the NFC function of the power receiving apparatus 101 is in a stopped state, the power transmitting apparatus 102 is configured to wirelessly transmit power of 5 watts to the power receiving apparatus 101 . to control. Specifically, when the number of detected NFC devices is 1 and the operating state of the NFC function of the power receiving apparatus 101 is not operating in the card emulation mode, the power transmitting apparatus 102 causes the power receiving apparatus 101 to Control to transmit 5 watts of power wirelessly.

Further, when the number of detected NFC devices is 0, the power transmission device 102 controls to wirelessly transmit power of 15 watts to the power reception device 101 . Further, when the number of detected NFC devices is two or more, the power transmitting apparatus 102 controls to wirelessly transmit power of 5 watts to the power receiving apparatus 101 .

In step F1118 of FIG. 11, the power transmitting apparatus 102 controls the power receiving apparatus 101 to wirelessly transmit power of 5 watts when the power requested from the power receiving apparatus 101 in the Specific Request packet is smaller than the threshold. Further, when the power requested by the power receiving apparatus 101 in the Specific Request packet is greater than the threshold, the power transmitting apparatus 102 controls so as not to wirelessly transmit power to the power receiving apparatus 101 .

As described above, according to the present embodiment, the power receiving apparatus 101 can receive efficient power supply from the power transmitting apparatus 102 conforming to the WPC standard while maintaining the operating state of the card emulation mode. Enables reduction of time.

(Other embodiments)
The present disclosure provides a program that implements one or more functions of the above-described embodiments 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 reads and executes the program. It can also be realized by processing to It can also be implemented by a circuit (for example, ASIC) that implements one or more functions.

Also, the power transmitting device and the power receiving device may be, for example, image input devices such as imaging devices (cameras, video cameras, etc.) and scanners, or image output devices such as printers, copiers, and projectors. Alternatively, it may be a storage device such as a hard disk device or a memory device, or an information processing device such as a personal computer (PC) or a smart phone.

Also, the power receiving device of the present disclosure may be an information terminal device. For example, an 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 support communication standards such as NFC communication and the fifth generation mobile communication system (5G).

Also, the power receiving device of the present disclosure may be a vehicle such as an automobile. For example, an automobile, which is a power receiving device, may receive power from a charger (power transmitting device) via a power transmitting antenna installed in a parking lot. Also, the automobile, which is the power receiving device, may receive power from a charger (power transmitting device) via a power transmitting antenna embedded in the road. In such automobiles, the received power is supplied to the battery. The power of the battery may be supplied to the driving unit (motor, electric unit) that drives the wheels, or may be used to drive sensors used for driving assistance or to drive the communication unit that communicates with external devices. good. In other words, in this case, the power receiving device may include a battery, a motor or sensor driven by the received power, and a communication unit that communicates with devices other than the power transmitting device, in addition to the wheels. Furthermore, the power receiving device may have a housing section that houses a person. For example, sensors include sensors used to measure the distance between vehicles and the distance to other obstacles. The communication unit may be compatible with, for example, the Global Positioning System (Global Positioning Satellite, GPS). Also, the communication unit may support a communication standard such as the fifth generation mobile communication system (5G). Also, the vehicle may be a bicycle or a motorcycle.

Also, 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 battery as well as a motor driven by received power stored in the battery. Also, these devices may have notification means for notifying the remaining amount of the battery. Also, these devices may have a communication unit that communicates with another device different from the power transmission device. The communication unit may support communication standards such as NFC and the fifth generation mobile communication system (5G).

Also, the power transmission device of the present disclosure may be an in-vehicle charger that transmits power to mobile information terminal devices such as smartphones and tablets that support wireless power transmission in the vehicle. Such an on-board charger may be provided anywhere in the vehicle. For example, the in-vehicle charger may be installed in the console of the automobile, or may be installed in the instrument panel (instrument panel, dashboard), between the seats of passengers, on the ceiling, or on the door. However, it should not be installed in a place that interferes with driving. Further, although the power transmission device has been described as an example of an in-vehicle charger, such a charger is not limited to being arranged in a vehicle, and may be installed in a transport machine such as a train, an aircraft, or a ship. Chargers in this case may also be installed between passenger seats, on the ceiling, or on the door.

Also, a vehicle such as an automobile equipped with an in-vehicle charger may be the power transmission device. In this case, the power transmission device has wheels and a battery, and uses the power of the battery to supply power to the power reception device through the power transmission circuit unit and the power transmission antenna.

It should be noted that the above-described embodiments merely show specific examples for carrying out the present disclosure, and the technical scope of the present disclosure should not be construed in a limited manner. That is, the present disclosure can be embodied in various forms without departing from its technical spirit or its main features.

The present disclosure is not limited to the above embodiments, and various modifications and variations are possible without departing from the spirit and scope of the present disclosure. Accordingly, to publicize the scope of this disclosure, the following claims are appended.

This application claims priority based on Japanese Patent Application No. 2021-166618 filed on October 11, 2021, and the entire contents thereof are incorporated herein.

Claims

A power receiving device that wirelessly receives power from a power transmitting device,
a first control means for controlling processing related to the power reception with the power transmission device;
a second control means for controlling an NFC (Near Field Communication) function;
and a third control means for controlling the entire power receiving device,
The power receiving device, wherein the first control means controls the operation of the second control means based on the operation state of the third control means.
The first control means controls the second control means to disable the NFC function when the remaining charge of the battery of the power receiving device is less than a threshold, and wirelessly transmits the power transmitting device to the power transmitting device. 2. The power receiving device according to claim 1, wherein the power receiving device is controlled to receive the power at .
The first control means controls the second control means to disable the NFC function when the third control means is in a stopped state, and wirelessly transmits power from the power transmission device. 2. The power receiving device according to claim 1, wherein the power receiving device is controlled to receive power.
2 or 4. The power receiving device according to 3.
After the first control means controls the second control means to enable the NFC function, the first control means does not control the operation of the second control means, and the third control means does not control the operation of the second control means. 5. The power receiving device according to claim 4, wherein said control means controls the operation of said second control means.
The power receiving device according to claim 1, wherein the first control means controls the operation of the second control means when the operation mode of the third control means changes.
The power receiving device according to claim 1, wherein the first control means controls the operation of the second control means when the operation of the third control means is stopped.
The first control means controls the operation of the second control means when there is no reply from the third control means in response to an inquiry about the operation state of the third control means. The power receiving device according to claim 1.
The power receiving device according to claim 1, wherein the first control means controls the operation of the second control means when the remaining charge of the battery of the power receiving device is smaller than a threshold.
When the third control means is activated, the first control means does not control the operation of the second control means, and the third control means controls the operation of the second control means. The power receiving device according to claim 7, characterized in that:
When there is a reply from the third control means in response to the inquiry about the operation state of the third control means, the first control means does not control the operation of the second control means, and the first control means does not control the operation of the second control means. 9. The power receiving device according to claim 8, wherein the control means of No. 3 controls the operation of the second control means.
When the remaining charge of the battery of the power receiving device is greater than the threshold, the first control means does not control the operation of the second control means, and the third control means controls the second control means. 10. The power receiving device according to claim 9, wherein the operation of the power receiving device is controlled.
When the third control means is in the first operating state, the first control means does not control the operation of the second control means, and the third control means is in the second control state. controls the action of the means,
When the third control means is in the second operating state, the third control means does not control the operation of the second control means, and the first control means is in the second control state. The power receiving device according to any one of claims 1 to 12, characterized in that it controls the operation of means.
After detecting the power transmission device, the first control means controls the second control means to disable the NFC function and to wirelessly receive power from the power transmission device. The power receiving device according to any one of claims 1 to 13, characterized by:
After receiving a Digital Ping from the power transmission device, the first control means controls the second control means to disable the NFC function and wirelessly receive power from the power transmission device. 15. The power receiving device according to any one of claims 1 to 14, wherein the power receiving device controls.
16. The first control means, after controlling the second control means to disable the NFC function, transmits a Signal Strength Packet to the power transmission device. 1. The power receiving device according to 1.
A power transmitting device that wirelessly transmits power to a power receiving device,
detection means for detecting the number of NFC (Near Field Communication) devices;
and control means for controlling wireless power transmission to the power receiving device according to the number of NFC devices detected by the detecting means and the operation state of the NFC function of the power receiving device. transmission device.
When the number of NFC devices detected by the detection means is 1 and the NFC function of the power receiving device is in an operating state, the control means wirelessly transmits first power to the power receiving device. 18. The power transmission device according to claim 17, wherein control is performed so as to
When the number of NFC devices detected by the detection means is one and the operating state of the NFC function of the power receiving device is operating in card emulation mode, the control means wirelessly communicates with the power receiving device. 19. The power transmission device according to claim 17 or 18, wherein control is performed so that the first power is transmitted at .
When the number of NFC devices detected by the detection means is 1 and the NFC function of the power receiving device is in a stopped state, the control means wirelessly transmits the power from the first power to the power receiving device. 19. The power transmission device according to claim 18, wherein control is performed to transmit a small second power.
When the number of NFC devices detected by the detection means is one and the operating state of the NFC function of the power receiving device is not operating in card emulation mode, the control means wirelessly communicates with the power receiving device. 20. The power transmission device according to claim 19, wherein control is performed so that a second power smaller than the first power is transmitted at .
When the number of NFC devices detected by the detection means is 0, the control means
The power transmitting device according to any one of claims 18 to 21, wherein the power receiving device is controlled to wirelessly transmit the first power.
When the number of NFC devices detected by the detection means is two or more, the control means controls to wirelessly transmit a second power smaller than the first power to the power receiving device. The power transmission device according to any one of claims 18 to 22, characterized by:
The control means is
When the number of NFC devices detected by the detecting means is 1, the NFC function of the power receiving device is in a stopped state, and the power requested from the power receiving device is smaller than a threshold, the power receiving device control to wirelessly transmit the second power to
When the number of NFC devices detected by the detecting means is 1, the NFC function of the power receiving device is in a stopped state, and the power requested from the power receiving device is greater than a threshold, the power receiving device 21. The power transmission device according to claim 20, wherein control is performed so that power is not transmitted wirelessly to the power transmission device.
A power receiving device that wirelessly receives power from a power transmitting device,
receiving means for receiving the number of NFC (Near Field Communication) devices detected by the power transmission device;
A power receiving device, comprising: first control means for controlling wireless power reception from the power transmitting device according to the number of the NFC devices and the operating state of the NFC function of the power receiving device.
a second control means for controlling the NFC function;
a third control means for controlling the entire power receiving device;
The first control means receives power wirelessly from the power transmission device according to the number of the NFC devices and the operating state of the NFC function when the third control means is in a stopped state. 26. The power receiving device according to claim 25, wherein control is performed such that
When the number of NFC devices is one and the NFC function of the power receiving device is in an operating state, the first control means wirelessly receives first power from the power transmitting device. 27. The power receiving device according to claim 25 or 26, wherein the power receiving device controls.
When the number of NFC devices is one and the operating state of the NFC function of the power receiving device is operating in a card emulation mode, the first control means wirelessly transmits the first power from the power transmitting device. 28. The power receiving device according to any one of claims 25 to 27, wherein the power receiving device is controlled to receive the power of .
When the number of NFC devices is one and the NFC function of the power receiving device is in a stopped state, the first control means wirelessly transmits a second power smaller than the first power from the power transmitting device. 28. The power receiving device according to claim 27, wherein the power receiving device is controlled to receive the power of .
When the number of the NFC devices is one and the operating state of the NFC function of the power receiving device is not operating in card emulation mode, the first control means wirelessly transmits the first power from the power transmitting device. 29. The power receiving device according to claim 28, wherein the power receiving device is controlled to receive a second power smaller than the first power.
31. The first control means according to any one of claims 27 to 30, wherein, when the number of said NFC devices is 0, said first control means performs control so as to wirelessly receive said first power from said power transmission device. 1. The power receiving device according to 1.
When the number of the NFC devices is two or more, the first control means performs control to wirelessly receive a second power smaller than the first power from the power transmission device. The power receiving device according to any one of claims 27 to 31.
A control method for a power receiving device that wirelessly receives power from a power transmitting device,
The power receiving device
a first control means for controlling processing related to the power reception with the power transmission device;
a second control means for controlling an NFC (Near Field Communication) function;
and a third control means for controlling the entire power receiving device,
A control method for a power receiving device, wherein the first control means controls the operation of the second control means based on the operation state of the third control means.
A control method for a power transmitting device that wirelessly transmits power to a power receiving device, comprising:
a detection step of detecting the number of NFC (Near Field Communication) devices;
and a control step of controlling to wirelessly transmit power to the power receiving device according to the number of the detected NFC devices and the operating state of the NFC function of the power receiving device. control method.
A control method for a power receiving device that wirelessly receives power from a power transmitting device,
a receiving step of receiving the number of NFC (Near Field Communication) devices detected by the power transmission device;
a first control step of controlling to wirelessly receive power from the power transmission device according to the number of the NFC devices and the operating state of the NFC function of the power reception device. control method.
A program for causing a computer to function as the power receiving device according to any one of claims 1 to 16 and 25 to 32.
A program for causing a computer to function as the power transmission device according to any one of claims 17-24.