JP2018191361A - Contactless power supply control method and system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contactless power supply system for performing wireless communication between a power transmitting device and a power receiving device to control transmitting and receiving of wireless power, capable of preventing overheating and destruction of the devices by stopping the wireless power transmission by detecting another receiving device or another transmitting device when a combination of the other power transmitting device and power receiving device performing transmission and reception of wireless power is approaching while wireless power is being transmitted and received between a first transmitting device and a first receiving device.SOLUTION: While transmitting and receiving wireless power between a first power transmitting device and a first power receiving device, when a combination of other power transmitting device and power receiving device transmitting and receiving wireless power approaches, power transmission of the first power transmitting device is stopped by either detecting the other power receiving device by the first power transmitting device or detecting the other power transmitting device by the first power receiving device.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a non-contact power supply control method and system for transmitting and receiving power in a non-contact manner.

  Rechargeable secondary batteries are often used for batteries of electronic devices as batteries of electronic devices have been reduced in size, increased in output, and increased in capacity.

  As a means for charging a secondary battery of an electronic device, a device using a dedicated charger, or a device that receives power supply from an external device in a wired manner and charges in an electronic device main body has been generally used. Non-contact power feeding for receiving power supply by electromagnetic waves without charging and charging in the electronic device main body has become common.

  In non-contact power feeding, the power determined by the communication after exchanging the power transmission / reception information between the power transmission device and the power receiving device by communication so as not to radiate electromagnetic waves from the power transmission device on the power transmission side in an uncontrolled state. Therefore, there is a demand for a method for performing power transmission and reception control without trouble by performing power transmission and power reception.

  In a one-to-one relationship between a power transmitting device and a power receiving device, control is generally performed so that wireless power is transmitted and received when the communication is established, and wireless power is not transmitted and received when the communication is not established. Is.

  When there are a plurality of power transmission devices, there is a need for a method of specifying a combination for transmitting and receiving wireless power between the power transmission device and the power receiving device and controlling the transmission and reception of wireless power without hindrance.

  A method of operating a rechargeable device, the step of detecting one or more transmitting elements located within an associated charging area, and the detected to enable optimal charging of the rechargeable device A method has been proposed that includes, among one or more transmission elements, selecting at least one transmission element from which wireless power is to be received (Patent Document 1).

  In addition, the charging device includes a plurality of first elements that induce electromagnetic induction, and a portable terminal that includes a second element that generates an electromotive force by electromagnetic induction induced by these first elements. , Power transmission means for transmitting power to the first element, and selection means for selecting a part from the plurality of first elements, wherein the power transmission means There has also been proposed a charging device that transmits power to the first element selected by the selection means when charging (Patent Document 2).

Special table 2012-518381 gazette JP 2009-201328 A

  The method described in Patent Literature 1 can select a combination of one power transmission device and one power reception device that performs wireless power transmission / reception from among a plurality of power transmission devices and one power reception device.

  The charging system described in Patent Literature 2 can select a power transmission element that transmits wireless power to the power receiving apparatus from among a plurality of power transmission elements included in the power transmission apparatus.

  In the methods described in Patent Document 1 and Patent Document 2, a method for selecting a power transmission unit for transmitting wireless power to a power reception unit from a plurality of power transmission units in advance is presented. The effects of power transmission means that cannot be detected or are not under control are not considered.

  When there are a plurality of power transmission devices, and there are a plurality of combinations of power transmission devices and power reception devices, and each is performing power transmission / reception, power transmission / reception is a control state for the combination of one power transmission device and power reception device. .

  However, for the combination of the other power transmitting device and the power receiving device, it is affected by electromagnetic waves leaking from the combination of the one power transmitting device and the power receiving device, and is configured to receive wireless power in an uncontrolled state, and the power receiving device is overheated or destroyed. There was a problem that suggested the possibility.

  An object of the present invention is to provide wireless communication between a first power transmitting device and a first power receiving device in a non-contact power feeding system that performs wireless communication between a power transmitting device and a power receiving device and controls transmission and reception of wireless power. When a combination of a power transmission device and another power transmission device that is transmitting / receiving wireless power approaches the power transmission / reception, it detects other power reception devices or other power transmission devices and stops wireless power transmission. An object of the present invention is to provide a method for preventing overheating and destruction of an apparatus.

  In order to achieve the above object, a first invention of the present application is a non-contact power feeding control method for a first power transmission device including a wireless communication unit and a wireless power transmission unit, wherein the wireless communication unit When the other power receiving device receiving the wireless power from the other power transmitting device is captured, the wireless power transmission by the wireless power transmitting means is stopped, and the wireless communication means is receiving the wireless power from the other power transmitting device. When other power receiving apparatuses are not captured, the wireless power transmission by the wireless power transmission means is resumed.

  In order to achieve the above object, a second invention of the present application is a non-contact power feeding control method for a first power receiving apparatus including a wireless communication unit and a wireless power receiving unit, wherein the wireless communication unit In the case where the power during communication is detected and the received power is greater than or equal to a first threshold, the wireless power receiving unit stops receiving wireless power, the wireless communication unit detects the power during communication, and When the received power becomes less than the first threshold, the wireless power receiving means restarts the reception of wireless power.

  In order to achieve the above object, a third invention of the present application is a non-contact power feeding control method for a first power receiving device including a wireless communication unit and a wireless power receiving unit, the wireless power receiving When the power received by the means is detected and the received power is greater than or equal to a second threshold, the wireless power receiving means stops receiving wireless power, and the wireless communication means detects the power being communicated, When the received power becomes less than the first threshold, the wireless power receiving means restarts the reception of wireless power.

  According to the present invention, in a non-contact power feeding system that performs wireless communication between a power transmission device and a power reception device and controls transmission and reception of wireless power, the wireless communication is performed between the first power transmission device and the first power reception device. When a combination of another power transmission device that is transmitting / receiving wireless power and the power reception device approaches during power transmission / reception, the wireless power transmission of the first power transmission device is stopped to stop the first power transmission device Security can be improved.

  Furthermore, when the approach of the combination of another power transmission apparatus and a power receiving apparatus that is transmitting and receiving wireless power is resolved, the wireless power transmission / reception between the first power transmitting apparatus and the first power receiving apparatus is resumed. Convenience can be improved while considering safety.

  With the above-described contactless power supply control method, it is possible to provide a contactless power supply control method and system that are easy for the user to use.

It is a flowchart which shows in parallel the relationship of the procedure which performs non-contact charge between the power transmission apparatus which concerns on the 1st Embodiment of this invention, and a power receiving apparatus. It is a block diagram which shows the structural example of the power transmission apparatus and power receiving apparatus which concern on the 1st Embodiment of this invention. It is a figure which shows the example of arrangement | positioning of the power transmission apparatus and power receiving apparatus which concern on the 1st Embodiment of this invention. It is an example of the apparatus status information of the power transmission apparatus and power receiving apparatus at the time of non-contact charge which concerns on the 1st Embodiment of this invention. It is a flowchart which shows in parallel the relationship of the procedure which performs non-contact charge between the power transmission apparatus and the power receiving apparatus in the 2nd Embodiment of this invention. It is a figure which shows the example of arrangement | positioning of the power transmission apparatus and power receiving apparatus in the 2nd Embodiment of this invention. It is an example of the apparatus status information of the power transmission apparatus and power receiving apparatus at the time of non-contact charge in the 2nd Embodiment of this invention. It is a block diagram which shows the structural example of the power transmission apparatus and power receiving apparatus in the 3rd Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the dimensions, shapes, relative arrangements, and the like of the component parts exemplified in this embodiment should be changed as appropriate according to the configuration of the apparatus to which the present invention is applied and various conditions, and the present invention is illustrated in these examples. It is not limited.

[First Embodiment]
In the first embodiment, the wireless power is being transmitted / received between the first power transmitting device and the first power receiving device, and the combination of the other power transmitting device and the power receiving device that is transmitting / receiving the wireless power (second) A method of stopping the wireless power transmission of the first power transmission device when the power transmission device of the first power transmission device and the second power reception device approach each other will be described.

  Note that FIG. 1 best represents the present embodiment. However, in order to make the explanation easier to understand, the present embodiment will be described with reference to FIG.

  FIG. 2 is a block diagram illustrating a configuration example of the power transmission device and the power reception device according to the present embodiment. In the block diagram used for the description of the present embodiment, power supply connections to blocks that are not necessary for the description of the present embodiment are omitted. Also, detailed descriptions of blocks and operations that are not necessary for the description of the present embodiment are omitted.

  In FIG. 2, reference numeral 201 denotes a power transmission device capable of wireless power transmission to the counterpart device. An AC / DC conversion circuit 202 converts an AC voltage input from the outside of the power transmission apparatus 201 into a DC voltage. The output converted to DC in 202 is converted into a voltage that can be supplied to the circuit block in the subsequent stage by the TX constant voltage circuit 203. Reference numeral 207 denotes a TX power supply IC for converting the voltage into a voltage that can be supplied to the subsequent digital low-voltage circuit block.

  Reference numeral 208 denotes a TX-CPU (Central Processing Unit) that controls the power transmission apparatus 201. In order to distinguish from a CPU described later, the CPU on the power transmission apparatus 201 side is referred to as TX-CPU. The TX-CPU 208 includes a RAM (Random Access Memory) used as a work area and a ROM (Read Only Memory) that stores the processing procedure of the TX-CPU 208.

  Reference numeral 209 denotes a non-contact IC reader / writer that can read data from and write data to a non-contact IC, and is used for short-range wireless communication with the non-contact IC and the non-contact IC reader / writer of other devices.

  Reference numeral 210 denotes a TX display unit that displays the status of the power transmission apparatus 201, and includes, for example, an LCD (Liquid Crystal Display) or an LED (Light Emitting Diode).

  Reference numeral 204 denotes a power transmission circuit for wirelessly transmitting power to the counterpart device, which mainly includes a transistor amplifier circuit and a crystal oscillation circuit.

  Reference numeral 205 denotes a matching circuit between the power transmission circuit 204 and the non-contact IC reader / writer 209 and a TX antenna 206 described later. The TX matching circuit 205 is a circuit that can be adjusted by the control of the TX-CPU 208, and the circuit setting can be changed between short-range wireless communication with the power receiving apparatus and wireless power transmission. The TX matching circuit 205 is provided with a protection circuit so that an excessive voltage is not generated during wireless power transmission.

  Reference numeral 206 denotes a TX antenna that can wirelessly transmit near field communication and power with other devices. The TX antenna 206 is assumed to be an antenna having a resonance frequency near 13.56 MHz, which is an HF band, for example.

  In FIG. 2, reference numeral 301 denotes a power receiving apparatus capable of communicating with the power transmitting apparatus 201 and receiving wireless power. Reference numeral 302 denotes an RX antenna that can receive power from a short-range wireless communication and wirelessly from the power transmission apparatus 201. The RX antenna 302 is assumed to be an antenna having a resonance frequency near 13.56 MHz, which is an HF band, for example.

  Reference numeral 303 denotes an RX matching circuit, and it is assumed that circuit settings can be changed between short-range wireless communication with the power transmission apparatus 201 and wireless power reception. The RX matching circuit 303 is a circuit that can be adjusted under the control of the RX-CPU 309 described later. The RX matching circuit 303 is provided with a protection circuit so that an excessive voltage is not generated in the circuit when receiving wireless power.

  Reference numeral 304 denotes a rectifying / smoothing circuit 304 that shapes an AC voltage generated by wireless power received from the power transmission apparatus 201 into a DC voltage. The voltage shaped into a DC voltage by the rectifying / smoothing circuit 304 is converted by the RX constant voltage circuit 305 into a voltage that can be supplied to a subsequent circuit block.

  Reference numeral 306 denotes a charge control circuit that can charge the battery 307. The charge control circuit 306 has a function of outputting the voltage of the battery 307 to other circuits in addition to the function of charging the battery 307. The battery 307 is assumed to be a one-cell lithium ion battery as an example.

  Reference numeral 311 denotes an RX power supply IC for converting an input voltage into a voltage of a subsequent digital low voltage system circuit block.

  Reference numeral 309 denotes an RX-CPU that performs short-range wireless communication with the power transmission apparatus 201 and wireless power reception control using the RX antenna 302. In order to distinguish from a CPU described later, the CPU that performs power reception control on the power receiving apparatus 301 side is referred to as RX-CPU. It is assumed that the RX-CPU 309 includes a RAM that is used as a work area and a ROM that stores the processing procedure of the RX-CPU 309.

  Reference numeral 310 denotes a power measurement circuit A for measuring the received power when receiving wireless power from the power transmission apparatus 201. Since the power measuring circuit is a general technique, description thereof is omitted.

  Reference numeral 312 denotes a power measurement circuit B for measuring the received power when receiving wireless power from the power transmission apparatus 201. Since the power measuring circuit is a general technique, description thereof is omitted.

  The difference between the power measurement circuit A310 and the power measurement circuit B312 is that the power measurement circuit A310 measures the output power of the RX constant voltage circuit 305, whereas the power measurement circuit B312 measures the output voltage of the RX antenna 302. It is. Depending on the operating state of the power receiving device 301, the power measurement circuit A310 or the power measurement circuit B312 may be selected to measure the power received by the RX antenna 302, or the power measurement circuit A310 and the power measurement circuit You may measure with both B312.

  Reference numeral 308 denotes a non-contact IC that can operate using only electromagnetic waves from the power transmission apparatus 201 during short-range wireless communication as power. As an example, the non-contact IC 308 corresponds to ISO / IEC21481 which is an international standard for short-range wireless communication.

  Reference numeral 330 denotes a CPU that controls the entire power receiving apparatus 301, and is different from the above-described RX-CPU 309 that performs power reception control of wireless power. Reference numeral 331 denotes a RAM used as a work area for the CPU 330. Reference numeral 332 denotes a ROM that stores the processing procedure of the CPU 330, and is composed of a rewritable nonvolatile memory such as a flash memory.

  Reference numeral 333 denotes an RX display unit that displays images such as image data and operation information on the screen of the power receiving apparatus 301, and is configured by an LCD, for example.

  Reference numeral 334 denotes an operation input unit that receives various operations of the power receiving apparatus 301, and transmits operation information to the CPU 330. Reference numeral 335 denotes a memory card, which can write and read digital data. Reference numeral 336 denotes an image pickup unit, which includes an optical unit including a lens and its drive system, and an image pickup element.

  337 is a wireless communication unit for performing wireless communication, and 338 is an antenna for performing wireless communication. It is assumed that the wireless communication unit 337 corresponds to a wireless standard different from the non-contact IC 308. As an example, it is assumed that IEEE 802.11, which is a WLAN standard, is supported.

The short-range wireless communication function of the power receiving device 301 is provided by the non-contact IC 308. When the non-contact IC 308 is read and written by short-range wireless communication, the non-contact IC 308 outputs an interrupt signal, and the RX-CPU 309 detects the interrupt signal to access the non-contact IC 308 and the power receiving device 301. It is assumed that processing for performing control is performed.
FIG. 1 is a flowchart illustrating in parallel the relationship of procedures for performing non-contact charging between the power transmitting apparatus 201 and the power receiving apparatus 301 according to the first embodiment.

  1 is executed by the TX-CPU 208, and the power receiving apparatus 301 is executed by the RX-CPU 309 unless otherwise specified. Since the CPU 330 of the power receiving apparatus 301 is not involved in the non-contact charge control of the first embodiment, the description of the CPU 330 and its peripheral function blocks is omitted.

  FIG. 3 is a diagram illustrating an arrangement example of a combination of the power transmission apparatus 201 and the power reception apparatus 301 described in the flow of FIG. 1 according to the first embodiment and a combination of other apparatuses with the power transmission apparatus 251 and the power reception apparatus 351. It is. The configurations of the power transmission device 251 and the power reception device 351 are the same as the configuration example of the power transmission device 201 and the power reception device 301 illustrated in FIG.

  FIG. 4 is an example of device status information transmitted / received between the power transmission device 201 and the power reception device 301 described in the flow of FIG. 1 according to the first embodiment.

  In the first embodiment, the device status information is read from the non-contact IC 308 by the short-range wireless communication of the non-contact IC reader / writer 209 of the power transmission device 201, and the information is written to the non-contact IC 308. .

  As an example, reading and writing of information from the non-contact IC 308 are performed using a read command and a write command of JISX6319-4.

  In the following description of the present invention, reading information from the non-contact IC 308 to another device and writing information from the other device to the non-contact IC 308 can be regarded as pseudo two-way communication. Therefore, this operation is expressed as transmission, reception, or transmission / reception, and detailed description thereof is omitted.

  The device status information of the power transmission device 201 includes, for example, “device name”, “power transmission status”, “power transmission availability”, “power transmission partner device”, “maximum power transmission power”, “power transmission / reception set power”, “error flag”. , “Error factor” and the like. Assume that device status information of the power transmission device 201 is stored in the TX-CPU 208 and the non-contact IC reader / writer 209.

The device status information of the power receiving device 301 includes “device name”, “battery voltage”, “battery status”, “power receiving availability”, “power receiving status”, “power receiving partner device”, “maximum power receiving power”, “sending power”. Including power receiving set power, “error flag”, “error factor”, etc. The device status information of the power receiving device 301 is stored in the RX-CPU 309 and the non-contact IC 308. In the flow of FIG. 1, the characteristic state is described using the arrangement example of FIG. 3 and the device status information example of FIG. I decided to.

  First, the arrangement state of FIG. The power transmitting apparatus 201 and the power receiving apparatus 301 are still at a distance where short-range wireless communication is not possible. The power transmission device 251 and the power reception device 351, which are combinations of other devices, are already in a state where short-range wireless communication has been established and power is being transmitted and received. In the arrangement state of FIG. 3A, the device status information of the power transmitting device 201 and the power receiving device 301 is the information shown in FIG. 4A in the initial state.

  Next, an operation of changing from the arrangement state of FIG. 3A to the arrangement state of FIG. 3B will be described. The power transmitting apparatus 201 and the power receiving apparatus 301 are close to a distance where short-range wireless communication is possible. The power transmission device 251 and the power reception device 351, which are combinations of other devices, do not change the state in which short-range wireless communication has already been established and wireless power is being transmitted and received.

  The power transmitting apparatus 201 transmits a polling signal using short-range wireless communication of the non-contact IC reader / writer 209 (step S101), and determines whether there is a response from the non-contact IC 308 of the power receiving apparatus 301 (step S102). In the short-range wireless communication in step S101, the power receiving apparatus 301 is captured using a request command of JISX6319-4 as an example.

  If it is determined in step S102 that there is no response from the power receiving apparatus 301 (NO in step S102), the apparatus status information of the power transmitting apparatus 201 is initialized (step S103), and the process returns to step S101 to transmit the polling signal again. When the device status information of the power transmission device 201 is initialized in step S103, the device status information is updated to the information shown in FIG.

  Here, the flow on the power receiving apparatus 301 side will be described. The power receiving apparatus 301 determines whether a short-range wireless communication polling signal has been received (step S201). If the power receiving apparatus 301 determines that the short-range wireless communication polling signal from the power transmitting apparatus 201 does not exist for a certain period (NO in step S201), the power receiving apparatus 301 initializes apparatus status information that is part of the data of the non-contact IC 308 (step S202). ). When the device status information of the power receiving device 301 is initialized in step S202, the device status information is updated to the information shown in FIG.

  When receiving the short-range wireless communication polling signal from the power transmitting apparatus 201 (YES in step S201), the power receiving apparatus 301 updates the apparatus status information that is part of the data of the non-contact IC 308 (step S203) and transmits a response. (Step S204).

  In step S <b> 203, the power receiving apparatus 301 sets “battery voltage” of the apparatus status information to “3.3 V”, “battery status” to “charge standby”, “reception availability” to “permitted”, and “power reception status” to “power reception standby”. , “Error flag” is updated to “NO”, and “Error factor” is updated to “None”.

  If communication with another power transmission device has already been established and wireless power is being received, power transmission / reception information with another power transmission device is stored in the device status information in step S203. Since the reception device 301 is the first communication with the power transmission device 201, the reception device 301 is updated to the above-described device status information.

  Now, the description returns to the flow on the power transmission apparatus 201 side. If it is determined in step S102 that there is a response from the power receiving apparatus 301 (YES in step S102), the power transmitting apparatus 201 receives apparatus status information of the power receiving apparatus 301 using short-range wireless communication (step S104).

  Here, the flow on the power receiving apparatus 301 side will be described. The power receiving device 301 transmits a response to the reception of the device status information of the power receiving device 301 by short-range wireless communication (step S205).

  Now, the description returns to the flow on the power transmission apparatus 201 side. In step S105, the power transmitting apparatus 201 determines whether there is a power receiving apparatus that is receiving wireless power from another power transmitting apparatus. In step S105, the power transmitting apparatus 201 determines whether the power receiving apparatus 301 is already receiving power from another power transmitting apparatus from the apparatus status information of the power receiving apparatus 301 received in step S104.

  When the power receiving apparatus 301 is receiving wireless power from another power transmitting apparatus (NO in step S105), the power transmitting apparatus 201 sets “power transmission status” of the apparatus status information to “power transmission stop”, “error flag” to “YES”, “Error factor” is updated to “detection of other device” (step S107).

  And the power transmission apparatus 201 transmits the apparatus status information of the power transmission apparatus 201 to the power receiving apparatus 301 using near field communication (step S109), stops the transmission of the wireless power (step S108), and returns to step S101.

  Note that the wireless power stopped in step S108 in the description of the present invention is different from the power used for short-range wireless communication, for example, the power for charging the battery 307 of the power receiving device 301 or the power receiving device 301 as a constituent block. Indicates the power to be used for operating either one.

  If the power receiving apparatus 301 is not receiving power from another power transmitting apparatus (YES in step S105), the power transmitting apparatus 201 determines whether the power receiving apparatus 301 is in a power receivable mode from the apparatus status information of the power receiving apparatus 301 received in step S104. Judgment is made (step S110).

  If the power receiving apparatus 301 is not in a power receivable mode (NO in step S110), “power transmission status” of the apparatus status information is “power transmission stopped”, “error flag” is “YES”, and “error factor” is “unable to receive power to the partner apparatus”. (Step S111). Then, the wireless power transmission is stopped (step S108), and the process returns to step S101.

  When the power receiving apparatus 301 is in the power receivable mode (YES in step S110), the power transmitting apparatus 201 sets the “power transmission status” of the apparatus status information to “power transmission standby”, “power transmitting counterpart apparatus” to “power receiving apparatus 301”, and “error flag”. "NO" and "Error factor" are updated to "None" (step S112). And the power transmission apparatus 201 transmits the apparatus status information of the power transmission apparatus 201 to the power receiving apparatus 301 using near field communication (step S113).

  In step S112 and step S113, the “power transmission / reception setting power” in the device status information of the power transmission device 201 and the power reception device 301 is set to 2.5 W that does not exceed the “maximum power reception power” of the power reception device 301.

  After executing step S113, the power transmitting apparatus 201 updates “transmission status” in the apparatus status information to “power transmission” and “transmission / reception set power” to “2.5 W” (step S114), and controls the power transmission circuit 204. Then, the transmission power is set according to the “transmission / reception setting power” of the device status information (step S115).

  Then, the power transmission circuit 204 is controlled to transmit wireless power to the power receiving apparatus 301 (step S116), and when the wireless power transmission ends, the process returns to step S101. When wireless power is transmitted in step S116, the TX matching circuit 205 is set to a circuit suitable for wireless power transmission from the power transmission circuit 204.

  In the following description of the present invention, when power is transmitted by controlling the power transmission circuit 204, the TX matching circuit 205 is set to a circuit suitable for wireless power transmission from the power transmission circuit 204. When the short-range wireless communication function of the non-contact IC reader / writer 209 is used, the TX matching circuit 205 is set to a circuit suitable for the short-range wireless communication of the non-contact IC reader / writer 209 and the control of the TX matching circuit 205 is performed. A description of the switching is omitted.

  Here, the flow on the power receiving apparatus 301 side will be described. The power receiving device 301 receives the device status information of the power transmitting device 201 by short-range wireless communication and transmits the device status information of the power receiving device 301 (step S206).

  The power receiving apparatus 301 determines whether the power transmitting apparatus 201 is in a power transmission enable mode from the received apparatus status information of the power transmitting apparatus 201 (step S207).

  When the power transmission apparatus 201 is not in the power transmission possible mode (NO in step S207), “battery status” of the apparatus status information is “charge standby”, “power reception status” is “power reception stop”, and “power transmission / reception set power” is “none”. “,“ Error flag ”is updated to“ YES ”, and“ Error factor ”is updated to“ No transmission to partner device ”(step S208), and the process returns to step S201.

  When the power transmitting apparatus 201 is in a power transmission enable mode (YES in step S207), the power receiving apparatus 301 sets “battery status” in the apparatus status information to “charging” and “power receiving status” to “power receiving” from the information transmitted and received in step S206. “Medium”, “Power receiving device” are updated to “Power transmitting device 201”, and “Power transmission / reception set power” are updated to “2.5 W” (step S209).

  The power receiving apparatus 301 connects the charging control circuit 306 to the RX constant voltage circuit 305 in accordance with “power transmission / reception set power” of the apparatus status information to set the received power (step S210), and receives wireless power from the power transmitting apparatus 201. (Step S211).

  In step S210, the RX matching circuit 303 is set to a circuit suitable for wireless power reception from the power transmission circuit 204 of the power transmission apparatus 201 at the same time as the charging control circuit 306 is connected. When the short-range wireless communication function of the non-contact IC 308 is used, the RX matching circuit 303 is set to a circuit suitable for the short-range wireless communication of the non-contact IC 308, and description of control switching of the RX matching circuit 303 is omitted. To do.

  In the flow described so far, the apparatus status information is the information shown in FIG. 4B in the arrangement state of FIG. The power transmission device 201 and the power reception device 301 enter a state in which short-range wireless communication is established and power is transmitted and received. The power transmission device 251 and the power reception device 351, which are combinations of other devices, do not change the state in which short-range wireless communication has already been established and wireless power is being transmitted and received.

  In step S211, the power receiving apparatus 301 receives wireless power from the power transmitting apparatus 201, and then determines whether the battery is fully charged (step S212). For example, whether the battery is fully charged is determined by the charge control circuit 306, and the determination result can be made if the determination result can be acquired by the RX-CPU 309.

  If the battery is not fully charged (NO in step S212), power reception device 301 returns to step S201. When the battery is fully charged (YES in step S212), the power receiving apparatus 301 updates the apparatus status information (step S213) and ends the flow. In step S213, the power receiving apparatus 301 sets “battery voltage” in the apparatus status information to “4.2V”, “battery status” to “full charge”, “power reception status” to “power reception standby”, and “power receiving partner apparatus”, for example. Update “None” and “Power transmission / reception set power” to “None”.

  If the “battery status” in the device status information of the power receiving device 301 is “full charge”, even when the power receiving device 301 is detached from the power transmitting device 201 and placed in the power transmitting device 201 again, wireless power transmission / reception is not performed. Even if possible, control without charging is possible.

  Next, when wireless power transmission / reception is repeated between the power transmission apparatus 201 and the power reception apparatus 301, another apparatus is used for the combination of the power transmission apparatus 201 and the power reception apparatus 301 as illustrated in FIG. The operation when the power transmission device 251 and the power reception device 351 that are combinations of the two approaches will be described.

  First, the communication partner of the power transmission apparatus 201 will be described as the power reception apparatus 351 instead of the power reception apparatus 301 using the flow of FIG. In step S101, the power transmitting apparatus 201 transmits a polling signal to capture the partner apparatus. Even if the power receiving device 301 exists as a counterpart device, when the power receiving device 351 approaches, the power receiving device 351 is captured, and the device status information is transmitted / received to determine whether the partner is capable of transmitting and receiving wireless power. Determine.

  In general short-range wireless communication, for example, JISX6319-4, a plurality of counterpart devices can be captured and communicated by polling using the anti-collision function. Communication is possible even if both devices 351 exist.

  The power transmitting apparatus 201 transmits a polling signal (step S101), and determines whether there is a response from the power receiving apparatus 351 (step S102). Here, the flow on the power receiving device 351 side will be described. The power receiving apparatus 351 determines whether a short-range wireless communication polling signal has been received (step S201). Upon receiving the short-range wireless communication polling signal from power transmission device 201 (YES in step S201), power reception device 351 updates device status information that is part of the data of non-contact IC 308 (step S203) and transmits a response. (Step S204).

  The power receiving apparatus 351 is already transmitting and receiving wireless power to and from the power transmitting apparatus 201. In step S203, the device status information of the power receiving device 351 is “3.8V” for “battery voltage”, “charging” for “battery status”, “possible” for “reception availability”, and “possibility” for “reception availability”. The “power receiving status” is “power receiving”, the “power receiving partner device” is “power transmitting device 251”, the “error flag” is “NO”, and the “error factor” is “none”.

  Now, the description returns to the flow on the power transmission apparatus 201 side. If it is determined in step S102 that there is a response from the power receiving apparatus 351 (YES in step S102), the power transmitting apparatus 201 receives apparatus status information of the power receiving apparatus 351 using short-range wireless communication (step S104).

  Here, the flow on the power receiving device 351 side will be described. The power receiving device 351 transmits a response to the reception of the device status information of the power receiving device 351 by short-range wireless communication (step S205).

  Now, the description returns to the flow on the power transmission apparatus 201 side. In step S105, the power transmitting apparatus 201 determines whether there is a power receiving apparatus that is receiving wireless power from another power transmitting apparatus. In step S105, the power transmitting apparatus 201 determines whether the power receiving apparatus 351 is already receiving power from another power transmitting apparatus from the apparatus status information of the power receiving apparatus 351 received in step S104.

  Since the power receiving device 351 is receiving wireless power from the power transmitting device 251, it is determined that step S105 is NO, and the power transmitting device 201 sets “power transmission status” of the device status information to “power transmission stopped” and “error flag” to “ “YES” and “error factor” are updated to “other device detection” (step S107).

  The transmission / reception of the device status information in step S109 may not be performed when the partner device is already receiving wireless power from another power transmission device. The power transmission device 251 stops wireless power transmission (step S108), and returns to step S101.

  Next, the case of the power receiving apparatus 301 that is the original wireless power transmitting / receiving partner as the communication partner of the power transmitting apparatus 201 will be described using the flow of FIG.

  In step S101, the power transmitting apparatus 201 transmits a polling signal to capture the partner apparatus. The power transmitting apparatus 201 transmits a polling signal (step S101), and determines whether there is a response from the power receiving apparatus 351 (step S102).

  Here, the flow on the power receiving apparatus 301 side will be described. The power receiving apparatus 301 determines whether a short-range wireless communication polling signal has been received (step S201). When receiving the short-range wireless communication polling signal from the power transmitting apparatus 201 (YES in step S201), the power receiving apparatus 301 updates the apparatus status information that is part of the data of the non-contact IC 308 (step S203) and transmits a response. (Step S204).

  The power receiving apparatus 301 is already transmitting and receiving wireless power to and from the power transmitting apparatus 201. In step S203, the device status information of the power receiving device 301 is “3.3V” for “battery voltage”, “charging” for “battery status”, “possible” for “power acceptability”, and “possible” for “power acceptability”. The “power receiving status” is “power receiving”, the “power receiving partner device” is “power transmitting device 201”, the “error flag” is “NO”, and the “error factor” is “none”.

  Now, the description returns to the flow on the power transmission apparatus 201 side. If it is determined in step S102 that there is a response from the power receiving apparatus 301 (YES in step S102), the power transmitting apparatus 201 receives apparatus status information of the power receiving apparatus 301 using short-range wireless communication (step S104).

  Here, the flow on the power receiving apparatus 301 side will be described. The power receiving device 301 transmits a response to the reception of the device status information of the power receiving device 301 by short-range wireless communication (step S205).

  Now, the description returns to the flow on the power transmission apparatus 201 side. In step S105, the power transmitting apparatus 201 determines whether there is a power receiving apparatus that is receiving wireless power from another power transmitting apparatus. In step S105, the power transmitting apparatus 201 determines that step S105 is NO because the power receiving apparatus 351 is already receiving wireless power from the power transmitting apparatus 251 through communication with the power receiving apparatus 351. Therefore, the power transmission apparatus 201 has been updated to “transmission status” of the apparatus status information, “YES” for “error flag”, and “detect other apparatus” for “error factor” (step S107).

  The power transmission apparatus 201 transmits apparatus status information of the power transmission apparatus 201 to the power receiving apparatus 301 using short-range wireless communication (step S109), stops wireless power transmission (step S108), and returns to step S101.

  Here, the flow on the power receiving apparatus 301 side will be described. The power receiving device 301 receives the device status information of the power transmitting device 201 by short-range wireless communication and transmits the device status information of the power receiving device 301 (step S206).

  The power receiving apparatus 301 determines whether the power transmitting apparatus 201 is in a power transmission enable mode from the received apparatus status information of the power transmitting apparatus 201 (step S207). When the power transmission apparatus 201 is not in the power transmission possible mode (NO in step S207), “battery status” of the apparatus status information is “charge standby”, “power reception status” is “power reception stop”, and “power transmission / reception set power” is “none”. “,“ Error flag ”is updated to“ YES ”,“ Error factor ”is updated to“ Detect other device ”(step S208), and the process returns to step S201.

  In the flow described so far, the apparatus status information becomes the information shown in FIG. 4C in the arrangement state of FIG. The power transmission device 201 and the power reception device 301 enter a state in which short-distance wireless communication is established but power transmission / reception and battery charging are stopped. The power transmission device 251 and the power reception device 351, which are combinations of other devices, do not change the state in which short-range wireless communication has already been established and wireless power is being transmitted and received.

  When the arrangement state of FIG. 3C returns to the arrangement state of FIG. 3B, the error of the apparatus status information that has occurred when the power transmission apparatus 201 captures the power reception apparatus 351 is resolved, and the power transmission apparatus 201 and the power receiving apparatus 301 return to a state in which short-range wireless communication is established and power is transmitted and received and the battery is charged. The power transmission device 251 and the power reception device 351, which are combinations of other devices, do not change the state in which short-range wireless communication has already been established and wireless power is being transmitted and received.

  According to the flow of FIG. 1 of the first embodiment, in the first embodiment, wireless power is transmitted / received during transmission / reception of wireless power between the first power transmission device and the first power reception device. When the combination of the other power transmitting device and the power receiving device is approaching, the wireless power transmission of the first power transmitting device can be stopped. Furthermore, when the approach of a combination of another power transmission device and a power reception device that is transmitting and receiving wireless power is eliminated, wireless power transmission and reception between the first power transmission device and the first power reception device may be resumed. it can.

[Second Embodiment]
In the first embodiment, a combination of another power transmitting device and a power receiving device that is transmitting and receiving wireless power approaches while transmitting and receiving wireless power between the first power transmitting device and the first power receiving device. In this case, the method has been described in which the first power transmission device captures a power reception device that is receiving power from another power transmission device and stops wireless power transmission of the first power transmission device.

  In the second embodiment, a combination of another power transmitting device and a power receiving device that is transmitting and receiving wireless power is approaching while wireless power is being transmitted and received between the first power transmitting device and the first power receiving device. In this case, a method will be described in which the first power receiving device detects wireless power from another power transmission device and stops the wireless power transmission of the first power transmission device.

  FIG. 5 is a flowchart showing in parallel the relationship of procedures for performing non-contact charging between the power transmitting apparatus 201 and the power receiving apparatus 301 in the second embodiment of the present invention. Since the electric device 201 and the power receiving device 301 in the second embodiment have the same configuration as in the first embodiment, description of the device configuration is omitted.

  FIG. 5 is a flowchart illustrating in parallel a procedure for performing non-contact charging between the power transmission device 201 and the power reception device 301 according to the first embodiment. Unless otherwise specified, the power transmission apparatus 201 is executed by the TX-CPU 208 and the power reception apparatus 301 is executed by the RX-CPU 309 unless otherwise specified. Since the CPU 330 of the power receiving apparatus 301 is not involved in the non-contact charging control of the second embodiment, the description of the CPU 330 and its peripheral function blocks is omitted. In FIG. 5, steps in which the same or similar processing as in FIG. 1 is performed are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 6 is a diagram illustrating an arrangement example of a combination of the power transmission device 201 and the power reception device 301 described in the flow of FIG. 5 according to the first embodiment and a combination of other devices with the power transmission device 251 and the power reception device 351. It is. The configurations of the power transmission device 201, the power reception device 301, the power transmission device 251, and the power reception device 351 are the same as the configuration example of the power transmission device 201 and the power reception device 301 illustrated in FIG. .

  FIG. 7 is an example of device status information transmitted and received between the power transmission device 201 and the power reception device 301 described in the flow of FIG. 5 according to the second embodiment. The device status information is the same as that in FIG. 4 according to the first embodiment, but the information content changes depending on the states of the power transmitting device and the power receiving device.

  In the flow of FIG. 5, a characteristic state will be described using the arrangement example of FIG. 6 and the apparatus status information example of FIG. First, the arrangement state of FIG. The power transmitting apparatus 201 and the power receiving apparatus 301 are at a distance where short-range wireless communication is still impossible. The power transmission device 251 and the power reception device 351, which are combinations of other devices, are already in a state where short-range wireless communication has been established and power is being transmitted and received. In the arrangement state of FIG. 6A, the device status information of the power transmitting device 201 and the power receiving device 301 is the information shown in FIG. 7A in the initial state.

  Next, an operation of changing from the arrangement state of FIG. 6A to the arrangement state of FIG. 6B will be described. The power transmitting apparatus 201 and the power receiving apparatus 301 are close to a distance where short-range wireless communication is possible. The power transmission device 251 and the power reception device 351, which are combinations of other devices, do not change the state in which short-range wireless communication has already been established and wireless power is being transmitted and received. In the arrangement state of FIG. 6B, the device status information of the power transmitting device 201 and the power receiving device 301 is the information shown in FIG. 7B in the initial state.

  Up to this point, there is no difference between the flow of FIG. 5 according to the second embodiment and the flow of FIG. 1 according to the first embodiment.

  Next, when wireless power transmission / reception is repeated between the power transmission apparatus 201 and the power reception apparatus 301, another apparatus is used for the combination of the power transmission apparatus 201 and the power reception apparatus 301 as illustrated in FIG. The operation when the power transmission device 251 and the power reception device 351 that are combinations of the two approaches will be described.

  The power transmitting apparatus 201 transmits a polling signal using short-range wireless communication of the non-contact IC reader / writer 209 (step S101), and determines whether there is a response from the non-contact IC 308 of the power receiving apparatus 301 (step S102). In the short-range wireless communication in step S101, the power receiving apparatus 301 is captured using a request command of JISX6319-4 as an example.

  The flow in which the power transmission device 201 captures the power reception device 301 and performs transmission and reception of wireless power is the same processing as the flow in FIG. 1 according to the first embodiment, and thus the description thereof is omitted.

  Differences between the flow of FIG. 5 according to the second embodiment and the flow of FIG. 1 according to the first embodiment will be described. The first difference on the power receiving device 301 side is that when the power receiving device 301 receives the polling signal in step S201, when the device status information is transmitted / received in step S205 and step S206, it is determined whether the received power is equal to or less than the threshold. The status information is updated. The second difference on the power receiving apparatus 301 side is that, when receiving power in step S211, it is determined whether the received power set with the power transmitting apparatus 201 is equal to or less than a threshold, and the apparatus status information is updated. .

  The difference on the power transmission device 201 side is that, after the power transmission device 201 transmits / receives the device status information in step S113, it is determined from the received device status information whether the power reception device 301 is in a power receivable state, and the device status information is updated. This is to stop the transmission of wireless power.

  First, the difference between the flow of FIG. 5 according to the second embodiment and the flow of FIG. 1 according to the first embodiment will be described from the operation of step S201 of the power receiving apparatus 301. The power receiving apparatus 301 determines whether a short-range wireless communication polling signal has been received (step S201). If the power receiving apparatus 301 determines that the short-range wireless communication polling signal from the power transmitting apparatus 201 does not exist for a certain period (NO in step S201), the power receiving apparatus 301 initializes apparatus status information that is part of the data of the non-contact IC 308 (step S202). ). When the device status information of the power receiving device 301 is initialized in step S202, the device status information is updated to the information shown in FIG.

  When the power receiving apparatus 301 receives the polling signal for short-range wireless communication from the power transmitting apparatus 201 (YES in step S201), the power receiving apparatus 301 measures the received power of the polling signal using the power measurement circuit B312 connected to the RX antenna 302. (Step S651). The power receiving apparatus 301 determines from the measurement result in step S651 whether the received power at the time of receiving the polling signal is equal to or less than a threshold value (step S652). The threshold value of the received power in step S652 is, for example, 0.2 W in the second embodiment, but the maximum value of the power standard for short-range wireless communication may be used as the threshold value.

  If the power receiving apparatus 301 determines that the received power of the polling signal for short-range wireless communication from the power transmitting apparatus 201 is equal to or greater than the threshold (NO in step S652), the power receiving apparatus 301 updates the apparatus status information (step S653). In the arrangement state of FIG. 6C, the power receiving device 301 is receiving a short-range wireless communication signal or wireless power from the power transmission device 251 in addition to the short-range wireless communication signal from the power transmission device 201. Therefore, in step S652 It is determined that the received power is greater than or equal to the threshold value.

  In step S653, the power receiving apparatus 301 sets the “battery status” to “charge standby”, “reception availability” to “impossible”, “reception status” to “reception stop”, “error flag” to “YES”, and “error factor”. Is updated to “detect power above threshold”, and the process returns to step S201.

  If the power receiving apparatus 301 determines that the received power of the short-range wireless communication polling signal from the power transmitting apparatus 201 is equal to or less than the threshold (YES in step S652), the power receiving apparatus 301 updates the apparatus status information that is part of the data of the non-contact IC 308. (Step S203), a response is transmitted (Step S204).

  In step S <b> 203, the power receiving apparatus 301 sets “battery voltage” of the apparatus status information to “3.3 V”, “battery status” to “charge standby”, “reception availability” to “permitted”, and “power reception status” to “power reception standby”. , “Error flag” is updated to “NO”, and “Error factor” is updated to “None”.

  Next, the difference between the flow of FIG. 5 according to the second embodiment and the flow of FIG. 1 according to the first embodiment will be described from the operation of step S205 of the power receiving apparatus 301. The power receiving device 301 transmits a response to the reception of the device status information of the power receiving device 301 by short-range wireless communication (step S205). When the power receiving apparatus 301 receives the short-range wireless communication signal from the power transmission apparatus 201 in step S205, the power receiving apparatus 301 measures the received power of the short-range wireless communication signal using the power measurement circuit B312 connected to the RX antenna 302 (step S654). ). The power receiving apparatus 301 determines from the measurement result in step S654 whether the received power at the time of receiving the short-range wireless communication signal is equal to or less than a threshold value (step S655). The threshold value of the received power in step S655 is, for example, 0.2 W in the second embodiment, but the maximum value of the power standard for near field communication may be used as the threshold value.

  If the power receiving apparatus 301 determines that the received power at the time of receiving the short-range wireless communication signal from the power transmitting apparatus 201 is equal to or greater than the threshold (NO in step S655), the power receiving apparatus 301 updates the apparatus status information (step S656). In the arrangement state of FIG. 6C, the power receiving device 301 is receiving a short-range wireless communication signal or wireless power from the power transmission device 251 in addition to the short-range wireless communication signal from the power transmission device 201. It is determined that the received power is greater than or equal to the threshold value.

  In step S656, the power receiving apparatus 301 sets the “battery status” to “charge standby”, “reception availability” to “impossible”, “reception status” to “reception stop”, “error flag” to “YES”, and “error factor”. Is updated to “detect power above threshold”, and the process returns to step S201.

  If the power receiving apparatus 301 determines that the received power at the time of receiving the short-range wireless communication signal from the power transmitting apparatus 201 is equal to or less than the threshold (YES in step S655), the power receiving apparatus 301 is the device status of the power transmitting apparatus 201 by short-range wireless communication. Information is received and device status information of the power receiving device 301 is transmitted (step S206).

  When the power receiving apparatus 301 receives the short-range wireless communication signal from the power transmission apparatus 201 in step S206, the power receiving apparatus 301 measures the received power of the short-range wireless communication signal using the power measurement circuit B312 connected to the RX antenna 302 (step S657). ). The power receiving apparatus 301 determines from the measurement result in step S657 whether the received power at the time of receiving the short-range wireless communication signal is equal to or less than a threshold value (step S658). The threshold value of the received power in step S658 is, for example, 0.2 W in the second embodiment, but the maximum value of the power standard for short-range wireless communication may be used as the threshold value.

  If the power receiving apparatus 301 determines that the received power at the time of receiving the short-range wireless communication signal from the power transmitting apparatus 201 is equal to or greater than the threshold (NO in step S658), the power receiving apparatus 301 updates the apparatus status information (step S659). In the arrangement state of FIG. 6C, the power receiving apparatus 301 is receiving a short-range wireless communication signal or wireless power from the power transmission apparatus 251 in addition to the short-range wireless communication signal from the power transmission apparatus 201. It is determined that the received power is greater than or equal to the threshold value.

  In step S659, the power receiving apparatus 301 sets the “battery status” to “charge standby”, “reception availability” to “impossible”, “reception status” to “reception stop”, “error flag” to “YES”, and “error factor”. Is updated to “detect power above threshold”, and the process returns to step S201.

  If the power receiving apparatus 301 determines that the received power at the time of receiving the short-range wireless communication signal from the power transmitting apparatus 201 is equal to or less than the threshold value (YES in step S658), the process proceeds to step S207, and whether the power transmitting apparatus 201 is in the power transmission enabled mode. Is determined (step S207).

  Next, the difference between the flow of FIG. 5 according to the second embodiment and the flow of FIG. 1 according to the first embodiment will be described from the operation of step S210 of the power receiving apparatus 301. The power receiving apparatus 301 connects the charging control circuit 306 to the RX constant voltage circuit 305 according to “power transmission / reception set power” of the apparatus status information to set the received power (step S210), and receives wireless power from the power transmitting apparatus 201 (step S210). S211).

  When the power receiving apparatus 301 receives wireless power from the power transmitting apparatus 201 in step S211, the power receiving apparatus 301 measures the received power of the wireless power by using the power measurement circuit A310 connected to the RX constant voltage circuit 305 (step S660). The power receiving apparatus 301 determines from the measurement result in step S660 whether the received power at the time of receiving the wireless power is equal to or lower than the “power transmission / reception set power” in the apparatus status information set in step S210 (step S661). “Power transmission / reception setting power” in step S661 is, for example, 2.5 W in the second embodiment, but is appropriately set according to the maximum transmission power of the power transmission device, the maximum power reception power of the power reception device, and the arrangement state of the power transmission device and the power reception device. Since it is a value to be set, it is not limited to 2.5 W. Further, a power value other than “power transmission / reception set power” may be set as a threshold value.

  If the power receiving apparatus 301 determines that the received power at the time of receiving the wireless power from the power transmitting apparatus 201 is greater than or equal to “power transmission / reception set power” (NO in step S661), the power receiving apparatus 301 updates the apparatus status information (step S662). ). In the arrangement state of FIG. 6C, the power receiving device 301 is receiving a short-range wireless communication signal or wireless power from the power transmitting device 251 in addition to the wireless power from the power transmitting device 201. It is determined that the power is greater than or equal to “power transmission / reception setting power”.

  In step S662, the power receiving apparatus 301 sets the “battery status” to “charge standby”, “reception availability” to “impossible”, “reception status” to “reception stop”, “error flag” to “YES”, and “error factor”. Is updated to “detect power above threshold”, and the process returns to step S201.

  When the power receiving apparatus 301 determines that the received power at the time of receiving the wireless power from the power transmitting apparatus 201 is equal to or lower than “power transmission / reception set power” (YES in step S661), the power receiving apparatus 301 receives the wireless power from the power transmitting apparatus 201 in step S211. Is received, it is determined whether the battery is fully charged (step S212).

  Finally, the difference between the flow of FIG. 5 according to the second embodiment and the flow of FIG. 1 according to the first embodiment will be described in the operations of step S110 and step S113 of the power transmission apparatus 201. The power transmitting apparatus 201 determines whether the power receiving apparatus 301 is in a power receivable mode from the apparatus status information of the power receiving apparatus 301 received in step S104 (step S110). If the power receiving apparatus 301 is not in a power receivable mode (NO in step S110), “power transmission status” of the apparatus status information is “power transmission stopped”, “error flag” is “YES”, and “error factor” is “unable to receive power to the partner apparatus”. (Step S111). Then, the wireless power transmission is stopped (step S108), and the process returns to step S101.

  The power transmitting apparatus 201 determines whether or not the power receiving apparatus 301 is in a power receivable mode from the apparatus status information of the power receiving apparatus 301 received in step S113 (step S551). If the power receiving apparatus 301 is not in the power receivable mode (NO in step S551), “power transmission status” of the apparatus status information is “power transmission stop”, “error flag” is “YES”, and “error factor” is “unable to receive power to the partner apparatus”. (Step S111). Then, the wireless power transmission is stopped (step S108), and the process returns to step S101.

  In steps S653, S656, S659, and S662 of the power receiving apparatus 301 described above, “power reception availability” of the apparatus status information of the power receiving apparatus 301 is “impossible”, “error flag” is “YES”, and “error factor” is “ If “power detection above threshold value”, the power receiving apparatus 301 is not in the power receiving enabled mode. Therefore, the determinations in step S110 and step S113 of the power transmission device 201 are NO.

  In the flow described so far, the apparatus status information becomes the information shown in FIG. 7C in the arrangement state of FIG. The power transmission device 201 and the power reception device 301 enter a state in which short-distance wireless communication is established but power transmission / reception and battery charging are stopped. The power transmission device 251 and the power reception device 351, which are combinations of other devices, do not change the state in which short-range wireless communication has already been established and wireless power is being transmitted and received.

  When the arrangement state of FIG. 6C returns to the arrangement state of FIG. 6B, the error of the apparatus status information that has occurred when the power receiving apparatus 301 detects the wireless power of the power transmission apparatus 251 is resolved. The power transmission device 201 and the power reception device 301 return to a state in which short-range wireless communication is established and power is transmitted and received and the battery is charged. The power transmission device 251 and the power reception device 351, which are combinations of other devices, do not change the state in which short-range wireless communication has already been established and wireless power is being transmitted and received.

  According to the flow of FIG. 5 of the second embodiment, in the second embodiment, wireless power is being transmitted / received between the first power transmitting apparatus and the first power receiving apparatus, and wireless power is being transmitted / received. When the combination of the other power transmission device and the power reception device approaches, the wireless power transmission of the first power transmission device can be stopped. Furthermore, when the approach of a combination of another power transmission device and a power reception device that is transmitting and receiving wireless power is eliminated, wireless power transmission and reception between the first power transmission device and the first power reception device may be resumed. it can.

  In the second embodiment, wireless power transmission / reception between the first power transmission device and the first power reception device is defined as wireless power feeding, in other words, wireless communication between the first power transmission device and the first power reception device. A power feeding period and a non-wireless power feeding period between the first power transmission apparatus and the first power receiving apparatus are provided, and wireless power feeding is stopped when power exceeding a threshold is received during the non-wireless power feeding period. And if the electric power received in the non-wireless power feeding period is less than the threshold value, it can be said that the operation is to resume the wireless power feeding.

[Third Embodiment]
In the first embodiment and the second embodiment, the configuration of an apparatus that performs short-range wireless communication between apparatuses and wireless power transmission / reception with a pair of antennas has been described. In the third embodiment, an apparatus configuration in which wireless communication between apparatuses is performed by one of two pairs of antennas and wireless power for charging is transmitted and received by the other antenna will be described.

  FIG. 8 is a block diagram illustrating a configuration example of a power transmission device and a power reception device according to the third embodiment. In the block diagram used for the description of the third embodiment, the power supply connection to the blocks unnecessary for the description of the third embodiment is omitted. In addition, detailed descriptions of blocks and operations unnecessary for the description of the third embodiment are omitted.

  Further, the block diagram of FIG. 2 according to the first embodiment has been described with reference numbers 2 ** and 3 **, whereas the block diagram of FIG. 8 according to the third embodiment has the diagram numbers 8 ** and 9 **. I will explain it. Blocks having the same last two digits of the figure numbers are blocks that operate in the same manner, and thus detailed description thereof will be omitted, and only differences between the block diagram of FIG. 2 and the block diagram of FIG. 8 will be described.

  The power transmission device 801 and the power reception device 901 perform short-range wireless communication between the devices using the TX communication antenna 856 and the RX communication antenna 952, and wireless power transmission / reception is performed in the same manner as in the first and second embodiments. This is performed using the TX antenna 806 and the RX antenna 902. A TX communication matching circuit 855 optimized for short-range wireless communication is disposed between the TX communication antenna 856 of the power transmission apparatus 801 and the non-contact IC reader / writer 809. An RX communication matching circuit 953 optimized for short-range wireless communication is disposed between the RX communication antenna 952 of the power receiving apparatus 901 and the non-contact IC 908.

  In the third embodiment, if the contactless IC 908 is compatible with, for example, ISO / IEC21481, which is an international standard for short-range wireless communication, the TX communication antenna 856 and the RX communication antenna 952 are in the HF band. The antenna is configured as an antenna having a resonance frequency near 56 MHz.

  In the third embodiment, since one of the two pairs of antennas is used for short-range wireless communication, wireless power can be transmitted and received with the other antenna. Therefore, the TX antenna 806 and the matching circuit 805, and the RX antenna 902 and the RX matching circuit 903 used for wireless power transmission / reception need not be configured as an antenna having a resonance frequency in the vicinity of 13.56 MHz which is the HF band. It is possible to take a band configuration. For example, an electromagnetic induction coil having a resonance frequency in the LF band of 100 to 400 kHz may be configured as an antenna.

[Other Embodiments]
In the first to third embodiments, as an example of capturing, reading, and writing a non-contact IC using a command of JISX6319-4 as a wireless communication command of the non-contact IC, the present invention can be applied. The wireless communication command of the non-contact IC is not limited to JISX6319-4. For example, the present invention can be applied even when a non-contact IC is captured, read, and written using an ISO / IEC 14443 command or an ISO / IEC 15693 command.

  In the first to third embodiments, the wireless communication of the contactless IC is described as being compatible with ISO / IEC21481, which is an international standard for short-range wireless communication. However, the wireless communication of the contactless IC to which the present invention can be applied. The communication standard is not limited to ISO / IEC21481. Any standard can be applied as long as it is a non-contact IC that operates using external electromagnetic waves as power. In terms of the frequency of electromagnetic waves, the present invention can be applied even if the frequency is in the frequency band of kHz to GHz of each part of the ISO / IEC18000 standard, even if it is not 13.56 MHz of ISO / IEC21481.

  In the first embodiment, the antenna used for wireless power transmission / reception has been described as an antenna having a resonance frequency near 13.56 MHz which is the HF band. In the second embodiment, it has been described that an antenna used for transmitting and receiving wireless power for charging may be configured as an antenna, for example, an electromagnetic induction coil having a resonance frequency in the LF band of 100 to 400 kHz. However, the frequency band used for transmitting and receiving wireless power to which the present invention can be applied is not limited to the HF band and LF band, and any frequency can be used as long as the electromagnetic wave can transmit and receive wireless power. The present invention is applicable.

  In the first to third embodiments, the non-contact IC is described as an example of the wireless communication unit on the power receiving apparatus side. However, the wireless communication unit to which the present invention can be applied is not limited to the non-contact IC. The power receiving apparatus includes a non-contact IC reader / writer instead of the non-contact IC, and the present invention can be applied even if wireless communication is performed in the card emulation mode or the P2P mode.

  Further, the wireless communication means of the present invention may be IEEE 802.11 that is a WLAN standard and IEEE 802.15.1 that is a short-range wireless standard. Instead of the non-contact IC reader / writer and the non-contact IC of the power transmission device and the power reception device, a wireless communication unit corresponding to the WLAN standard or the short-range wireless standard may be provided. In short, as long as the present invention is configured to perform wireless communication between a power transmission device and a power reception device and transmit and receive wireless power, any wireless communication means may be used.

  Various forms without departing from the gist of the present invention are also included in the present invention, and a part of the above-described embodiments may be appropriately combined. Also, a software program that realizes the functions of the above-described embodiments is supplied from a recording medium directly to a communication system or an electronic device having a computer that can execute the program using wired / wireless communication, and the program is executed. This case is also included in the present invention. Accordingly, the program code itself supplied and installed in the computer in order to implement the functional processing of the present invention by the computer also realizes the present invention. That is, the computer program itself for realizing the functional processing of the present invention is also included in the present invention. In this case, the program may be in any form as long as it has a program function, such as an object code, a program executed by an interpreter, or script data supplied to the OS. The recording medium for supplying the program may be, for example, a magnetic recording medium such as a hard disk or a magnetic tape, an optical / magnetomagnetic recording medium, or a nonvolatile semiconductor memory. As a program supply method, a method of recording a computer program forming the present invention on a server on a computer network and downloading a computer program by a connected client computer is also conceivable.

  When the present invention is applied to the above recording medium, program codes corresponding to the flows shown in FIGS. 1 and 5 are stored in the recording medium.

201 power transmission device, 251 power transmission device, 801 power transmission device, 301 power reception device,
351 Power receiving device, 901 Power receiving device

Claims (15)

A first power transmission device including a wireless communication unit and a wireless power transmission unit,
When the wireless communication unit captures another power receiving device that is receiving wireless power from another power transmission device, the wireless power transmission unit stops wireless power transmission, and the wireless communication unit transmits wireless power from the other power transmission device. A non-contact power feeding control method for a power transmission device, comprising: resuming wireless power transmission by the wireless power transmission means when no other power receiving device receiving power is captured. A first power receiving device including a wireless communication unit and a wireless power receiving unit,
If the wireless communication means detects the power being communicated and the received power is greater than or equal to a first threshold, the wireless power reception means stops receiving wireless power, and the wireless communication means A non-contact power feeding control method for a power receiving apparatus, comprising: detecting power reception by the wireless power receiving unit when the received power is less than a first threshold. A first power receiving device including a wireless communication unit and a wireless power receiving unit,
When power received by the wireless power receiving means is detected, and the received power is greater than or equal to a second threshold, the wireless power receiving means stops receiving wireless power, and the power being communicated by the wireless communication means When the received power becomes less than a first threshold value, the wireless power receiving unit resumes receiving the wireless power. A first power receiving device including a wireless communication unit and a wireless power receiving unit, a wireless communication unit capable of communicating with the first power receiving device, and power transmission to the first power receiving device without contact In a non-contact power feeding system comprising a wireless power transmission means and a first power transmission device provided,
A power supply time during which wireless power is transmitted and received by the wireless power transmission means and the wireless power reception means between the first power transmission device and the first power reception device, and the first power transmission device and the first power reception device. A non-power feeding time during which no wireless power is transmitted / received by the wireless power transmitting means and the wireless power receiving means is set, and the received power of the first power receiving apparatus is equal to or greater than a threshold value during the non-power feeding period In this case, the wireless power transmission control method is characterized in that wireless power transmission / reception by the wireless power transmission unit and the wireless power reception unit is stopped between the first power transmission device and the first power reception device.   When the received power of the first power receiving apparatus becomes less than the threshold during the non-power feeding period, the wireless power transmitted by the wireless power transmitting means and the wireless power receiving means is between the first power transmitting apparatus and the first power receiving apparatus. The non-contact power feeding control method according to claim 4, wherein power transmission / reception is resumed. A second power receiving device including a wireless communication unit, a wireless power receiving unit, and a device status information storage unit; a wireless communication unit capable of communicating with the second power receiving device; and the second power receiving device. A wireless power transmission unit capable of transmitting power by contact, a second power transmission device including a device status information storage unit, and a unit similar to the second power reception device and the second power transmission device In a non-contact power feeding system consisting of another power receiving device and another power transmitting device,
The second power receiving device and the second power transmitting device transmit and receive device status information including capture of the counterpart device, identification information of the counterpart device, and the status of the counterpart device by the wireless communication unit, and at least wireless power After performing wireless communication storing the identification information as the power transmission / reception partner device in the device status information storage means, the wireless power transmission means and the wireless power reception means start wireless power transmission / reception to transmit / receive wireless power Then, after the second power receiving device and the second power transmitting device start the wireless power transmission / reception, the wireless communication means captures the partner device, identification information of the partner device, and the state of the partner device. The apparatus transmits and receives the apparatus status information including the information, and repeatedly performs the wireless communication stored in the apparatus status information storage unit. When another power receiving device that is receiving line power is captured, a part of the device status information of the second power transmitting device is changed to an error state to stop wireless power transmission by the wireless power transmission means, The non-contact power feeding control method according to claim 2, wherein a part of the device status information of the second power receiving device is changed to an error state by the wireless communication. A second power receiving device including a wireless communication unit, a wireless power receiving unit, and a device status information storage unit; a wireless communication unit capable of communicating with the second power receiving device; and the second power receiving device. A wireless power transmission unit capable of transmitting power by contact, a second power transmission device including a device status information storage unit, and a unit similar to the second power reception device and the second power transmission device In a non-contact power feeding system consisting of another power receiving device and another power transmitting device,
The second power receiving device and the second power transmitting device transmit and receive device status information including capture of the counterpart device, identification information of the counterpart device, and the status of the counterpart device by the wireless communication unit, and at least wireless power After performing wireless communication storing the identification information as the power transmission / reception partner device in the device status information storage means, the wireless power transmission means and the wireless power reception means start wireless power transmission / reception to transmit / receive wireless power Then, after the second power receiving device and the second power transmitting device start the wireless power transmission / reception, the wireless communication means captures the partner device, identification information of the partner device, and the state of the partner device. The device status information including the device status information storage means is repeatedly transmitted and received, and the wireless communication is repeatedly performed. The second power receiving device detects the received power during the wireless communication, When the received power is greater than or equal to the first threshold, part of the device status information of the second power receiving device is changed to an error state, and the second power receiving device A non-contact power feeding control method, wherein a part of the device status information is changed to an error state, and wireless power transmission by the wireless power transmission unit of the second power transmission device is stopped. A second power receiving device including a wireless communication unit, a wireless power receiving unit, and a device status information storage unit; a wireless communication unit capable of communicating with the second power receiving device; and the second power receiving device. A wireless power transmission unit capable of transmitting power by contact, a second power transmission device including a device status information storage unit, and a unit similar to the second power reception device and the second power transmission device In a non-contact power feeding system consisting of another power receiving device and another power transmitting device,
The second power receiving device and the second power transmitting device transmit and receive device status information including capture of the counterpart device, identification information of the counterpart device, and the status of the counterpart device by the wireless communication unit, and at least wireless power After performing wireless communication storing the identification information as the power transmission / reception partner device in the device status information storage means, the wireless power transmission means and the wireless power reception means start wireless power transmission / reception to transmit / receive wireless power Then, after the second power receiving device and the second power transmitting device start the wireless power transmission / reception, the wireless communication means captures the partner device, identification information of the partner device, and the state of the partner device. The device status information including is transmitted and received, and the wireless communication stored in the device status information storage unit is repeatedly performed, and the second power receiving device detects the received power during the wireless power transmission / reception. When the received power is greater than or equal to a second threshold, a part of the device status information of the second power receiving device is changed to an error state, and the second power receiving device performs the second power transmission by the wireless communication. A non-contact power feeding control method, wherein a part of the device status information of the device is changed to an error state, and wireless power transmission by the wireless power transmission unit of the second power transmission device is stopped.   The contactless power supply control method according to claim 7, wherein the first threshold value for detecting the received power is less than a maximum power of a wireless communication standard of a wireless communication unit.   The second power receiving apparatus and the second power transmitting apparatus transmit and receive the wireless power before starting the wireless power transmission and reception for transmitting and receiving wireless power by the wireless power transmitting means and the wireless power receiving means. The transmission / reception power setting means for setting power is further provided, and the second threshold value for detecting the reception power is less than the wireless power set by the transmission / reception power setting means. Non-contact power supply control method.   If the second power transmitting apparatus stops capturing another wireless power receiving apparatus that is receiving wireless power from the other power transmitting apparatus captured by the wireless communication, an error in part of the device status information of the second power transmitting apparatus The state is canceled, the second power transmission device cancels a part of the error state of the device status information of the second power receiving device by the wireless communication, and the wireless power transmission means of the second power transmission device wirelessly The non-contact power feeding control method according to claim 6, wherein power transmission is resumed.   When the second power receiving apparatus detects that the received power during the wireless communication is less than a first threshold, the second power receiving apparatus cancels a part of the error status of the device status information of the second power receiving apparatus, and The second power receiving device cancels a part of the error state of the device status information of the second power transmitting device by the wireless communication, and resumes the wireless power transmission by the wireless power transmitting means of the second power transmitting device. The non-contact power feeding control method according to claim 7, wherein the method is a non-contact power feeding control method.   A non-contact power supply system using the non-contact power supply control method according to any one of claims 1 to 12.   A contactless power supply system using the contactless power supply control method according to any one of claims 1 to 12 in combination.   The computer-readable program for functioning the non-contact electric power feeding system of Claim 13 or Claim 14.