JP6519968B2 - Contactless power transmission system and power receiving device - Google Patents

Description

  The present invention relates to a contactless power transmission system and a power receiving device.

  As a noncontact power transmission system that does not use a power cord or a power transmission cable, for example, a power transmission device having a primary coil to which alternating current power is input, and a secondary side capable of receiving alternating current power from the primary coil without contact. There is known one including a power receiving device having a coil (see, for example, Patent Document 1). In such a non-contact power transmission system, for example, when the primary coil and the secondary coil perform magnetic field resonance, AC power is transmitted from the power transmission device to the power reception device in a non-contact manner. The AC power received by the power receiving device is used, for example, to charge a vehicle battery of a vehicle equipped with the power receiving device.

JP, 2009-106136, A

  Here, a plurality of power transmission devices may be provided at a place where a plurality of vehicles can be parked, such as a parking lot of a public facility. In this case, it is necessary to grasp which one of the plurality of power transmission devices and the power reception device perform power transmission.

  The object of the present invention is made in view of the above-mentioned circumstances, and is to provide a contactless power transmission system and a power receiving device capable of suitably grasping a combination of a power transmitting device and a power receiving device in which power transmission is performed. .

A contactless power transmission system for achieving the above object comprises a plurality of power transmission devices each having a primary coil to which AC power is input from a power supply unit which is an internal power supply of the power transmission device , and a power transmission communication unit performing wireless communication. A contactless power transfer system comprising: a secondary coil capable of contactlessly receiving the AC power input to the primary coil; and a power receiving device having a power receiving communication unit for performing wireless communication In the above, the power reception device includes a grasping unit for grasping the communicable power transmission device, and the noncontact power transmission system is grasped by the grasping unit when the plurality of power transmission devices are grasped by the grasping unit. has been said and pick the one of the power transmission device 1 of the power transmission device of the plurality of power transmitting device and the power receiving device, the power transmission side communication unit and the power receiving side communication unit connected like a connection is established through the A connection state setting unit for setting a, the power transmission and the connection state became the power transmitting apparatus and the power reception device transmits the determination unit determines whether it is possible to perform power transmission between, by the transmission determination unit while when it is determined to be a line Ukoto continues the connection state, releases the connected state when the power transmitted by the transmission determination unit is determined row Ukoto is not possible And a continuation determination unit, wherein the continuation determination unit determines that the connection state is to be continued is the connection continuation state, and the non-connection state and the non-connection continuation state is the unconnected state. Then, the grasping unit has the power transmission side communication unit capable of wireless communication with the power reception side communication unit among the plurality of power transmission devices, and at least the unconnected state excluding the connection continuation state. The Is intended to grip, the connection state setting unit includes: a power transmission device of the one chosen from among the power transmission device of the unconnected state of being grasped by the grasping portion, and said power receiving unit, set to the connected state and to Turkey and features.

  According to this configuration, the determination by the transmission determination unit is performed after the unconnected power transmission device and the power reception device in one of the plurality of power transmission devices are connected. When it is determined by the transmission determination unit that power transmission is to be performed, the connection state is continued. As a result, power can be transmitted between the power transmission device and the power reception device in the connection continuation state while exchanging information as it is through each communication unit.

  On the other hand, when it is determined by the transmission determination unit that power transmission is not performed, the connection state is released. Thus, the power receiving device can be connected to another unconnected power transmitting device. Therefore, it is possible to perform the determination by the transmission determination unit for the other power transmission device and the power reception device.

  Here, if one power receiving device can be simultaneously connected to a plurality of power transmission devices, it becomes difficult or complicated to grasp which power transmission device is targeted, so it is necessary to grasp a combination for performing power transmission. May be difficult or complicated.

  On the other hand, according to this configuration, since the power transmission device and the power reception device in one unconnected state are configured to be in the connected state, the above-mentioned inconvenience can be avoided. Moreover, it can be avoided that the power transmission devices in the connected state are redundantly connected.

  Furthermore, at least the power transmission device in the connection continuation state is excluded from the grasping targets of the grasping unit. Thereby, the number of power transmission devices to be grasped can be reduced. Therefore, the setting of the connection state and the number of determinations by the transmission determination unit can be reduced, and the time required to grasp the combination in which the power transmission is performed can be shortened. In addition, since the power transmission device in the connection continuation state is already determined to be a combination in which power transmission is performed by the determination by the transmission determination unit, no trouble occurs even if it is excluded from the grasp target. Therefore, the combination in which power transmission is performed can be grasped suitably.

  In the contactless power transmission system, the grasping unit is, among the plurality of power transmission devices, the power transmission communication unit capable of wireless communication with the power reception communication unit in the unconnected state or the connected state. It is good to grasp what you have. According to this configuration, the grasping unit grasps the unconnected power transmission device and the connected power transmission device. Here, the power transmission device in the connected state may be in the unconnected state depending on the determination result of the transmission determination unit. Therefore, by including the power transmission device in the connected state in the grasp target, it is possible to preferably grasp the combination in which the power transmission is performed.

  In the contactless power transmission system, the grasping unit controls the power receiving side communication unit so that a predetermined response request signal is transmitted, and the power transmission device at least excludes the connection continuation state. When the power transmission side communication unit receives the response request signal in the unconnected state, the power transmission side communication unit transmits the response signal to the power receiving side communication unit, while the connection is continued Power transmission control for controlling the power transmission communication unit not to transmit the response signal from the power transmission communication unit to the power reception communication unit when the power transmission communication unit receives the response request signal in the situation And the grasping unit wirelessly communicates with the power receiving communication unit among the plurality of power transmission devices based on the response signal received by the power receiving communication unit. Be one having the power transmission side communication unit capable, and, may grasp at least one said unconnected except for the connection persistent state. According to this configuration, when the power transmission side communication unit of the power transmission device in the connection continuation state receives the response request signal, the power transmission side communication unit does not transmit the response signal. As a result, the power transmission device in the connection continuation state is excluded from the grasping targets of the grasping unit. Therefore, the above-described configuration can be realized with a relatively simple configuration.

  In the non-contact power transmission system, the connection state setting unit transmits power in the non-connection state different from the power transmission device whose connection state is released when the connection state is released by the continuation determination unit. The device and the power receiving device may be set in the connection state. According to this configuration, when the connection state is released, the power transmission device and the power reception device in the unconnected state other than the power transmission device in the disconnected state are connected, and the determination by the transmission determination unit To be done. Thus, it is possible to preferably grasp the combination in which the power transmission is performed through setting of the connection state and the like sequentially until the combination in which the power transmission is performed is grasped.

In the contactless power transfer system, the transmission determination unit determines as the first AC power for determining whether the secondary coil receives power to the primary coil of the power transmission device in the connected state. first identification power controls the power transmission device of the connection state so as to input from the previous SL power unit over a first period, the first identification power is inputted to the primary coil In the case where it is determined that AC power is received by the secondary coil, and the AC power is determined to be received according to the first power reception determination, the connection is performed again. with respect to the primary coil of the state of the power transmission device, the second identification power as the second AC power before Symbol power over a second period to determine if the received at the secondary coil Of the connected state as input from the A second power reception determination that controls a power supply device and determines whether AC power is received by the secondary coil when the second identification power is input to the primary coil; When it is determined that the AC power is received by the second power reception determination, it is determined that the power transmission is performed, but the AC power is not received by the second power reception determination. If it is determined that the power transfer is not performed, it may be determined that the power transfer is not performed. According to this configuration, both the first power reception determination and the second power reception determination are performed. As a result, even when the determination result of the first power reception determination is erroneously determined to be a positive determination, the second power reception determination is performed, whereby the erroneous determination of the transmission determination unit can be suppressed. Therefore, the determination accuracy of the transmission determination unit can be improved.

In the contactless power transfer system, the transmission determination unit determines, as AC power for determining whether the secondary coil receives power to the primary coil of the power transmission device in the connection state, as identification power. There controlling the power transmission device of the connection state so as to input from the previous SL power unit, the AC power is powered by the secondary coil when the identification power is inputted to the primary coil Power transmission determination, and the transmission determination unit determines that AC power is received by the secondary coil by the power reception determination, the power transmission When it is determined that the AC power is not received by the secondary coil by the power reception determination, it may be determined that the power transmission is not performed. According to this configuration, when the identification power is input to the primary side coil and the AC power is received by the secondary side coil, it is determined that the power transmission is performed. Thereby, as compared with the configuration in which the power reception determination is performed a plurality of times, it can be relatively easily determined whether or not the power transmission is performed, and the time required for the determination by the transmission determination unit can be shortened.

  In the noncontact power transmission system, when the noncontact power transmission system determines that the connection state is to be continued by the continuation determination unit, the power transmission device in the connection continuation state until a predetermined termination condition is satisfied. The power for transmission may be input as the AC power to the primary side coil. According to this configuration, based on the continued connection state, the power transmission related to the power for transmission is performed until the termination condition is satisfied. As a result, the power for transmission is input to the primary side coil after it is recognized that the combination is for power transmission, so the power for transmission is the primary side coil even though the combination is not for the power transmission. You can avoid being input to Thus, unnecessary power loss can be avoided.

The power receiving apparatus for achieving the above object is contactless AC power from a power transmission apparatus having a primary side coil to which AC power is input from a power supply section which is an internal power supply of the power transmission apparatus and a power transmission side communication section performing wireless communication. In the power receiving device capable of receiving the power, a grasp for grasping the power transmitting device capable of communicating with the secondary coil capable of receiving the AC power input to the primary coil, the power receiving side communication unit performing wireless communication, and the power transmitting device When one or more of the power transmission devices are grasped by the grasping unit, one of the plurality of power transmission devices grasped by the grasping unit is selected and the one or more power transmission devices and the power reception device are selected. Performing a power transfer between the power transmission device and the power receiving device, wherein the power transmission device and the power receiving device are in a connection state setting unit configured to set the connection state in which the connection via the power transmission side communication unit and the power reception side communication unit is established. about A transmission determination unit that determines possibility whether, while continuing the connection state when the power transmission is determined to be a line Ukoto by the transmission determination unit, the power transmitted by the transmission determination unit and a continuation determination unit to release the connection state when it is determined that the row Ukoto is not possible, the state in which it is determined to continue the connected state to the connected continuous state by the continuation determining section If the connection state is not the connection continuation state, the grasping unit determines that the power transmission side communication can communicate with the power reception side communication unit among the plurality of power transmission devices. The connection state setting unit is configured to , among the power transmission devices in the non-connected state , grasped by the grasping unit. Choose from And the one of the power transmission apparatus I, and the power receiving device, and wherein the Turkey be set in the connected state.

  According to this configuration, the determination by the transmission determination unit is performed after the unconnected power transmission device and the power reception device in one of the plurality of power transmission devices are connected. When it is determined by the transmission determination unit that power transmission is to be performed, the connection state is continued. As a result, power can be transmitted between the power transmission device and the power reception device in the connection continuation state while exchanging information as it is through each communication unit.

  On the other hand, when it is determined by the transmission determination unit that power transmission is not performed, the connection state is released. Thus, the power receiving device can be connected to another unconnected power transmitting device. Therefore, it is possible to perform the determination by the transmission determination unit for the other power transmission device and the power reception device.

  Here, if one power receiving device can be simultaneously connected to a plurality of power transmission devices, it becomes difficult or complicated to grasp which power transmission device is targeted, so it is necessary to grasp a combination for performing power transmission. May be difficult or complicated.

  On the other hand, according to this configuration, since the power transmission device and the power reception device in one unconnected state are configured to be in the connected state, the above-mentioned inconvenience can be avoided. Moreover, it can be avoided that the power transmission devices in the connected state are redundantly connected.

  Furthermore, at least the power transmission device in the connection continuation state is excluded from the grasping targets of the grasping unit. Thereby, the number of power transmission devices to be grasped can be reduced. Therefore, the setting of the connection state and the number of determinations by the transmission determination unit can be reduced, and the time required to grasp the combination in which the power transmission is performed can be shortened. In addition, since the power transmission device in the connection continuation state is already determined to be a combination in which power transmission is performed by the determination by the transmission determination unit, no trouble occurs even if it is excluded from the grasp target. Therefore, the combination in which power transmission is performed can be grasped suitably.

  According to the present invention, it is possible to preferably grasp the combination of the power transmission device and the power reception device in which the power transmission is performed.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the outline | summary of a contactless energy transfer system. The block diagram which shows the electric constitution of the contactless energy transfer system. It is a timing chart which shows the 1st case, (a) shows the power reception mode of the 1st power receiving device, (b) shows the power transmission mode of the 1st power transmission device, (c) shows the power transmission mode of the 2nd power transmission device And (d) shows the power receiving mode of the second power receiving apparatus. The schematic diagram which shows a 1st case. The schematic diagram which shows a 2nd case. It is a timing chart which shows the 2nd case, (a) shows the power reception mode of the 1st power receiving device, (b) shows the power reception mode of the 2nd power receiving device, (c) shows the power transmission mode of the 1st power transmission device (D) shows the power transmission aspect of a 2nd power transmission apparatus. It is a timing chart which shows the 3rd case, (a) shows the power reception mode of the 1st power receiving device, (b) shows the power reception mode of the 2nd power receiving device, (c) shows the power transmission mode of the 1st power transmission device (D) shows the power transmission aspect of a 2nd power transmission apparatus. It is a timing chart which shows the 4th case, (a) shows the power reception mode of the 1st power receiving device, (b) shows the power reception mode of the 2nd power receiving device, (c) shows the power transmission mode of the 1st power transmission device (D) shows the power transmission aspect of a 2nd power transmission apparatus.

Hereinafter, an embodiment in which the contactless power transmission system is applied to a vehicle will be described.
As shown in FIG. 1, the non-contact power transmission system 10 includes a power transmission device 11 (charging station) capable of non-contact power transmission and a power reception device 12 (vehicle-side device). The power receiving device 12 is mounted on a vehicle C.

  A plurality of power transmission devices 11 are installed corresponding to the plurality of parking spaces S1 and S2 in which the vehicle C can park. In this case, for convenience of description, the power transmission device 11 installed near the first parking space S1 is referred to as a first power transmission device 11a, and the power transmission device 11 installed near the second parking space S2 is a second power transmission device 11b. It is said. Each power transmission apparatus 11a, 11b is the same.

  As shown in FIG. 2, the first power transmission apparatus 11 a includes a first power supply unit 21 a that can output AC power of a predetermined frequency. The first power supply unit 21 a converts system power input from the system power supply E as an infrastructure into AC power, and outputs the converted AC power. And the 1st power transmission apparatus 11a is provided with the 1st primary side coil (power transmission part) 22a to which the alternating current power output from the 1st power supply part 21a is input.

  The first power transmission device 11a includes a first power transmission controller 23a as a power transmission control unit that performs various controls of the first power transmission device 11a, and a first power transmission communication unit 24a that performs wireless communication. The first power transmission side controller 23a receives a signal from the first power transmission side communication unit 24a, and the first power transmission side communication unit 24a is set to transmit a predetermined signal from the first power transmission side communication unit 24a. Control.

  Similar to the first power transmission device 11a, the second power transmission device 11b includes the second power supply unit 21b, the second primary coil 22b, the second power transmission controller 23b, and the second power transmission communication unit 24b. Since these configurations are the same as the respective configurations of the first power transmission device 11a, the description will be omitted.

  Here, as shown in FIG. 1, the primary coils 22a and 22b are disposed one by one in the parking spaces S1 and S2, respectively. Specifically, the first primary coil 22a is disposed in the first parking space S1, and the second primary coil 22b is disposed in the second parking space S2.

  The power receiving device 12 includes a secondary coil (power receiving unit) 31 capable of receiving AC power without contact from any one of the primary coils 22a and 22b. The respective primary coils 22a and 22b and the secondary coil 31 are configured to be capable of magnetic field resonance. For example, primary side capacitors (not shown) are connected in series or in parallel to the primary side coils 22a and 22b, respectively, to form a resonant circuit. Similarly, a secondary side capacitor (not shown) is connected in series or in parallel to the secondary side coil 31 to form a resonant circuit. The resonant frequencies of the resonant circuit including the first primary coil 22a, the resonant circuit including the second primary coil 22b, and the resonant circuit including the secondary coil 31 are set to be the same.

  According to this configuration, in a situation where the secondary side coil 31 is disposed at a position where magnetic field resonance can occur with either of the primary side coils 22a and 22b, AC power is supplied to the primary side coil capable of magnetic field resonance. When it is input, the resonance circuit including the primary coil and the resonance circuit including the secondary coil 31 resonate in the magnetic field. Thus, the secondary coil 31 receives AC power from the primary coil without contact. The frequency of the AC power output from each of the power supply units 21a and 21b may be set to be equal to or close to the resonant frequency of each of the resonant circuits.

  As shown in FIG. 1, the secondary side coil 31 is disposed at a position where it can be disposed opposite to any of the respective primary side coils 22 a and 22 b, specifically, at the bottom of the vehicle C. When the vehicle C is parked in any of the parking spaces S1 and S2, the secondary coil 31 faces the primary coil installed in the parked parking space, and the primary side It is placed at a position where magnetic field resonance with the coil is possible.

  As shown in FIG. 2, the power receiving device 12 includes a rectifier 32 that rectifies AC power received by the secondary coil 31 and a vehicle battery 33 to which DC power rectified by the rectifier 32 is input. There is. Thus, the vehicle battery 33 is charged.

  The power reception device 12 also includes a detection unit 34 that detects AC power received by the secondary coil 31 (hereinafter simply referred to as received power). The detection unit 34 transmits the detection result to the power reception side controller 35 as a power reception side control unit provided in the power reception device 12. Thereby, the power receiving controller 35 can grasp the received power. That is, based on the detection result of the detection unit 34, the power reception side controller 35 grasps the received power pattern such as the power value of the received power and the timing (time) at which the received power is detected.

  The power receiving device 12 also includes an SOC sensor (not shown) that detects the state of charge (SOC) of the vehicle battery 33 and transmits the detection result to the power receiving controller 35. As a result, the power receiving controller 35 can grasp the charge state of the vehicle battery 33.

  The power receiving device 12 performs wireless communication, and includes a power receiving side communication unit 36 capable of exchanging signals with the power transmission side communication units 24 a and 24 b. The power reception side controller 35 receives a signal from the power reception side communication unit 36, and controls the power reception side communication unit 36 so that a predetermined signal is transmitted.

  The wireless communicable range of each of the power transmission side communication units 24 a and 24 b and the power reception side communication unit 36 is set wider than the first parking space S 1 and the second parking space S 2. Therefore, in the present embodiment in which the plurality of power transmission devices 11 are installed, the plurality of power transmission devices 11 are included in the wireless communicable range of the power reception side communication unit 36. That is, the power reception side communication unit 36 can wirelessly communicate with the power transmission side communication units (the first power transmission side communication unit 24 a and the second power transmission side communication unit 24 b) of the plurality of power transmission devices 11. In addition, as a communication system of each communication part 24a, 24b, 36, Bluetooth (trademark), Zigbee (trademark), Wi-fi etc. can be considered, for example.

  The non-contact power transmission system 10 according to the present embodiment has a configuration for grasping the combination of the power transmission device 11 and the power reception device 12 in which power transmission is performed. The configuration will be described in detail below.

  As shown in FIG. 2, the power reception side controller 35 includes a grasping unit 41 that grasps the power transmission device 11 present around itself. The grasping unit 41 controls the power reception side communication unit 36 so that the search signal is transmitted by broadcast as a predetermined response request signal. When the power transmission side communication units 24 a and 24 b receive the search signal, the power transmission side controllers 23 a and 23 b determine whether or not the connection is in the continuous state. The power transmission side controllers 23a and 23b transmit the search response signal including the identification information of the power transmission devices 11a and 11b, which is information related to the power transmission devices 11a and 11b, to the power receiving side communication unit 36 when the connection is not continued. The power transmission side communication units 24a and 24b are controlled to be controlled. On the other hand, the power transmission side controllers 23a and 23b control the power transmission side communication units 24a and 24b so that the search response signal is not transmitted when the connection is continued. The connection continuation state will be described later.

  In this configuration, the grasping unit 41 grasps the power transmission device 11 having the power transmission side communication unit capable of wirelessly communicating with the power reception side communication unit 36 based on the search response signal received by the power reception side communication unit 36. A list of power transmission devices 11 is created.

  In the present embodiment, the number of first primary coils 22a included in the first power transmission apparatus 11a is one. That is, the first power transmission device 11a and the first primary coil 22a correspond on a one-to-one basis. For this reason, the identification information of the first power transmission device 11a can be said to be information on the first primary coil 22a. The same applies to the identification information of the second power transmission device 11b.

  When the grasping unit 41 grasps the plurality of power transmission devices 11, the power reception side controller 35 selects one power transmission device 11 and one power reception device 12 in the unconnected state among the plurality of power transmission devices 11. The connection state setting unit 42 is configured to set a connection state (or a communication establishment state) in which connection via the power transmission side communication unit of the power transmission device 11 and the power reception side communication unit 36 is established. Note that the unconnected state is a state neither connected nor connected.

  The connection state setting unit 42 selects, for example, the first power transmission device 11 a as one power transmission device 11 among the plurality of power transmission devices 11. Then, the connection state setting unit 42 transmits a connection request signal to the first power transmission side communication unit 24 a of the selected first power transmission device 11 a using the power reception side communication unit 36.

  When the connection request signal is received by the first power transmission side communication unit 24a, the first power transmission side controller 23a determines whether the first power transmission device 11a is in the connected state or in the unconnected state. When the first power transmission device 11a is in the unconnected state, the first power transmission controller 23a sets the first power transmission device 11a to the connected state connected to the power receiving device 12, and the first power transmission communication unit The connection status response signal is transmitted using 24a. The connection state setting unit 42 sets the power reception device 12 to the connection state in which the power reception device 12 is connected to the first power transmission device 11 a when the power reception side communication unit 36 receives the connection state response signal. Thereby, it is possible to exchange information and the like regarding the received power between the first power transmission device 11 a and the power reception device 12.

  In other words, it can be said that the connection state is a state in which exchange of information on received power is possible. In the connection state, pairing is established (authentication) that the first power transmission device 11a and the power reception device 12 exchange information with each other via the first power transmission communication unit 24a and the power reception communication unit 36. It can be said that it is a state.

  The connection state setting unit 42 sets a flag indicating the connection state in a predetermined storage area based on the connection state. As a result, the power receiving controller 35 can grasp whether or not the connection state is established by confirming the presence or absence of the flag. Similarly, the first power transmission controller 23a sets a flag indicating that it is in the connection state in a predetermined storage area based on the connection state.

  On the other hand, when the first power transmission apparatus 11a is already in the connected state, the first power transmission controller 23a transmits a connection refusal signal to reject the connection to the power receiving communication section 36 using the first power transmission communication section 24a. Do. Here, when the first power transmission device 11a is in the connection state, it means that the first power transmission device 11a is in the connection state with the power reception device 12 different from the power reception device 12 that has transmitted the connection request signal. . That is, the first power transmission device 11a is regulated to be in the connection state with the plurality of power reception devices 12 simultaneously.

  When the connection refusal signal is received by the power receiving side communication unit 36, the connection state setting unit 42 selects another power transmission device 11 (for example, the second power transmission device 11 b) among the plurality of power transmission devices 11 recognized by the grasping unit 41. Execute processing (connection request) to be in the connection state. That is, the connection state setting unit 42 sequentially requests connection until the unconnected power transmission device 11 is found among the plurality of power transmission devices 11 recognized by the grasping unit 41.

  Note that the connection state setting unit 42 does not reach the connection state despite the connection request made to all of the plurality of power transmission devices 11 recognized by the grasping unit 41 (connection is rejected In the case of (1), a connection request is sequentially made to each of the power transmission devices 11 again after a predetermined period. Then, the connection state setting unit 42 determines that an error occurs if the connection state does not change to the connection state although the connection request to all the power transmission devices 11 is made multiple times.

  Incidentally, the connection state setting unit 42 may set and update the state of each of the power transmission devices 11 with respect to the list created by the grasping unit 41. For example, the connection state setting unit 42 first sets each of the power transmission devices 11 in the list as not connected as an initial state. Then, the connection state setting unit 42 updates the power transmission device 11 whose connection request has been rejected as pending, and updates the power transmission device 11 which has been set as the connection state and then released from the connection state as transmission determined. Good. Note that the connection state setting unit 42 may make a connection request again to the power transmission device 11 on hold depending on the situation, but makes a connection request to the power transmission device 11 for which transmission has been determined. Absent.

  Between the power transmission device 11 (for example, the first power transmission device 11 a) and the power reception device 12 which are set to the connection state based on the connection state setting unit 42 sets the power reception side controller 35 to the connection state. And a transmission determination unit 43 that determines whether or not power transmission is to be performed. The power transmission device 11 set in the connection state corresponds to the target power transmission device.

  The transmission determination unit 43 uses the power reception communication unit 36 to input the identification power to the first primary coil 22 a of the first power transmission apparatus 11 a in the connection state, and transmits the identification power to the first power transmission communication unit 24 a. And transmits a power transmission request signal (instruction signal).

  When the power transmission request signal is received by the first power transmission communication unit 24a, the first power transmission controller 23a performs the first primary power over the first period T1 in which the identification power is predetermined as the AC power. The first power supply unit 21a is controlled to be input to the side coil 22a.

The transmission determination unit 43 determines, based on the detection result of the detection unit 34, whether or not AC power is received in the situation where the identification power is input to the first primary coil 22a.
Specifically, the transmission determination unit 43 is in the current connection state when AC power is not received by the secondary coil 31 in a situation where the identification power is input to the first primary coil 22a. It is determined that power transmission is not performed between the first power transmission device 11 (first power transmission device 11a) and the power reception device 12.

  Incidentally, “when AC power is received” may be, for example, a case where AC power of a power value equal to or greater than a predetermined threshold value is detected by the detection unit 34. In this case, the threshold may be, for example, a value obtained by multiplying the power value of the identification power by a predetermined threshold efficiency.

  The above series of processes, that is, when the identification power is input to the first primary coil 22a and the identification power is input to the first primary coil 22a, the secondary coil 31 The process of determining whether AC power is received is referred to as a first received power determination.

  On the other hand, when it is determined by the first power reception determination that the AC power is received, the transmission determination unit 43 performs the second power reception determination. In detail, the transmission determination unit 43 instructs the first power transmission controller 23a to input the identification power to the first primary coil 22a for the second period T2, and the secondary coil 31 It is determined whether the AC power is received or not. In the present embodiment, the first period T1 and the second period T2 are the same.

  Here, the transmission determination unit 43 sets the first interval period Ti1 from the first input power for identification power end to the second input power for identification power input to the first power transmission device 11a, which is the target power transmission device. It is determined based on the unique information 23aa of. Then, the transmission determination unit 43 instructs the first power transmission side controller 23a to input the second identification power at the timing when the first interval period Ti1 has elapsed from the first input power of the identification power. Specifically, the transmission determination unit 43 causes the second power transmission request signal to be transmitted at the timing when the first interval period Ti1 has elapsed from the first input power for identification power end.

  The power transmission side controllers 23a and 23b include unique information 23aa and 23bb of the power transmission devices 11a and 11b. The transmission determination unit 43 receives the specific information (specific information 23aa or specific information 23bb) from the power transmission device 11 (the first power transmission device 11a or the second power transmission device 11b) in the connected state before performing the first power reception determination. Get it. Then, the transmission determination unit 43 determines an interval period (first interval period Ti1 or second interval period Ti2) using the specific information.

  The specific information is arbitrary as long as it differs depending on the power transmission device 11 (the power transmission device 11 set in the connection state) to be the target power transmission device, but, for example, identification information of the power transmission device 11 or the power transmission communication unit 24a. , 24 b communicate with the power receiving side communication unit 36, and the like. Also, it may be communication ID information such as PANID or SSID.

  In addition, the difference between the first interval period Ti1 when the target power transmission device is the first power transmission device 11a and the second interval period Ti2 corresponding to the second power transmission device 11b is longer than the second period T2. It is set. The first period T1 is the same regardless of the power transmission devices 11.

  When it is determined that the AC power is received by the second power reception determination, the transmission determination unit 43 of one of the power transmission device 11 (first power transmission device 11a) and the power reception device 12 in the current connection state. It is determined that power transmission is performed between them. On the other hand, when it is determined that the AC power is not received by the second power reception determination, the transmission determination unit 43 transmits power between the power transmission device 11 and the power reception device 12 of 1 that has become the connection state this time. Determine that it is not done.

  That is, in the present embodiment, when it is determined that the AC power is received by the secondary coil 31 in both the first power reception determination and the second power reception determination, the transmission determination unit 43 It is determined that one power transmission device 11 and one power reception device 12 have become a combination in which power transmission is performed.

  Focusing on the fact that the transmission determination by the transmission determination unit 43 is executed based on the setting of the connection state by the connection state setting unit 42, the setting of the connection state is a condition for performing the transmission determination. It can be said that there is.

As shown in FIG. 2, the power reception side controller 35 includes a continuation determination unit 44 which continues or cancels the connection state based on the determination result of the transmission determination unit 43.
If it is determined by the transmission determination unit 43 that power transmission is performed between the power transmission device 11 (for example, the first power transmission device 11a) and the power reception device 12 in the connection state, the continuation determination unit 44 continues the connection state. Do. Specifically, the continuation determination unit 44 transmits the continuation request signal for requesting the continuation of the connection state to the first power transmission side communication unit 24 a using the power reception side communication unit 36. The first power transmission controller 23a determines that the current connection state is to be continued when the continuation request signal is received by the first power transmission communication unit 24a, and the continuation response signal is transmitted using the first power transmission communication unit 24a. Are transmitted to the power receiving side communication unit 36. Continuation determination unit 44 determines that the connection state is to be continued when the continuation response signal is received by power reception side communication unit 36.

  In the following description, the state in which the continuation determination unit 44 determines that the connection state is to be continued is referred to as a connection continuation state. Further, when it is determined that the connection state is to be continued, the continuation determination unit 44 of the first power transmission side controller 23a and the power reception side controller 35 erases the flag indicating the connection state, and indicates the connection continuation state in the predetermined storage area. Set the flag. Thereby, the first power transmission controller 23a and the power receiving controller 35 can grasp whether or not the connection is in the continuous state.

  That is, the power transmission device 11 and the power reception device 12 can be in the three states of the connection state, the connection continuation state, or the unconnected state which is neither the connection state nor the connection continuation state. The power transmission side controllers 23a and 23b and the power reception side controller 35 are configured to be able to grasp which one of the above three states (non-connection state, connection state, and connection continuation state) the current state is.

  On the other hand, when it is determined by the transmission determination unit 43 that power transmission is not performed between the first power transmission device 11a and the power reception device 12, the continuation determination unit 44 cancels the connection state and transmits the first power transmission device 11a. And sets the power receiving device 12 in the unconnected state. Specifically, the continuation determination unit 44 cancels the connection with the first power transmission device 11a and erases the flag indicating the connection state. Then, using the power reception side communication unit 36, the continuation determination unit 44 transmits, to the first power transmission side communication unit 24a, a release request signal for requesting release of the connection state. When the release request signal is received by the first power transmission side communication unit 24 a, the first power transmission side controller 23 a releases the connection state with the power receiving device 12 and erases the flag indicating the connection state.

  In the non-contact power transmission system 10, when the continuation determination unit 44 determines that the connection state is to be continued, the power transmission device 11 in the connection continuation state (for example, the first power transmission device 11a) until a predetermined termination condition is satisfied. Power transmission is performed between the power reception device 12 and the power reception device 12.

  Specifically, the power reception side controller 35 transmits, using the power reception side communication unit 36, to the first power transmission side communication unit 24a, a charge request signal for requesting charging power having a power value larger than the identification power as alternating current power. Do. The first power transmission side controller 23a is configured such that the charging power is input to the first primary side coil 22a when the charging request signal is received by the first power transmission side communication unit 24a. Control. As a result, the charging power is transmitted from the first power transmission device 11a to the power reception device 12, and the vehicle battery 33 is charged.

  While the power transmission by charging power is being performed, the power receiving controller 35 periodically grasps the power value of the received power, and uses the information on the grasp result to the first power transmission side using the power receiving communication unit 36. It transmits to the communication part 24a. The first power transmission controller 23a controls the first power supply unit 21a so that the power value of the received power becomes a desired power value when the above information is received by the first power transmission communication unit 24a. That is, while the vehicle battery 33 is being charged, information is exchanged via the first power transmission side communication unit 24 a and the power reception side communication unit 36.

  Further, the power receiving controller 35 determines whether or not the termination condition is satisfied, and when the termination condition is satisfied, a charge termination request signal requesting charging termination using the power receiving communication unit 36. Are transmitted to the first power transmission side communication unit 24a. The first power transmission controller 23a controls the first power supply unit 21a to stop the output of the charging power when the first power transmission communication unit 24a receives the charge end request signal.

  Here, the termination condition may be, for example, when the state of charge (SOC) of the vehicle battery 33 is fully charged (state of charge termination), or when any problem occurs in power transmission.

  Further, the termination condition is not limited to this. For example, in a configuration in which each power transmission device 11a, 11b is provided with the termination switch, the case where the termination switch is operated may be adopted as the termination condition. In this case, the power transmission side controllers 23a and 23b may determine whether the end switch has been operated. That is, the termination condition is arbitrary, and the execution subject of the determination as to whether the termination condition is satisfied may be the power reception side controller 35 or the power transmission side controllers 23a and 23b.

  In the non-contact power transmission system 10, when the connected state is released by the continuation determination unit 44, one of the plurality of power transmission devices 11 determined by the grasping unit 41 has one of the power It is configured to determine whether or not the power transmission device 11 and the power reception device 12 different from the power transmission device 11) for which transmission has been determined are a combination in which power transmission is performed.

  Specifically, when the continued state determination unit 44 releases the connected state, the connected state setting unit 42 is in an unconnected state different from the power transmitting device 11 (for example, the first power transmitting device 11a) whose connected state is released. The power transmission device 11 (for example, the second power transmission device 11b) and the power reception device 12 are set in a connection state. Then, the transmission determination unit 43 determines whether or not power transmission is performed between the second power transmission apparatus 11 b and the power reception apparatus 12 in the newly set connection state (first received power determination and second received power determination). I do. Whether the continuation determination unit 44 continues the connection state between the second power transmission device 11 b and the power reception device 12 based on the determination result of the transmission determination unit 43 for the second power transmission device 11 b and the power reception device 12 Determine About these concrete composition, since it is the same as that when the 1st power transmission device 11a and the power receiving device 12 are in a connection state, detailed explanation is omitted.

  Incidentally, the connection state setting unit 42 is configured to perform setting (connection request) of a new connection state based on the continuation determination unit 44 releasing the connection state. That is, the power receiving device 12 is regulated to be in a state of connection with the plurality of power transmitting devices 11 at the same time.

  Here, as described above, the grasping unit 41 grasps the power transmission device 11 based on the connection response signal. The connection response signal is transmitted when the connection is not in the continuous state, but is not transmitted when the connection is in the continuous state. For this reason, the grasping unit 41 has a power transmission communication unit capable of wireless communication with the power reception communication unit 36 among the plurality of power transmission devices 11, and other than the connection continuation state (unconnected state or connection Figure out what is in the state. Note that the power receiving communication unit 36 and the power transmitting communication unit capable of wireless communication exist within a specific distance (a distance at which the power receiving communication unit 36 can communicate) predetermined with respect to the power receiving communication unit 36. It can be said that it is a thing.

  When one power transmission device 11 is grasped by the grasping unit 41, the connection state setting unit 42 sets the grasped power transmission device 11 and the power reception device 12 in a connection state. Then, the transmission determination unit 43 determines whether power transmission is performed between the power transmission device 11 and the power reception device 12 in the connection state. Then, if the determination result of transmission determination unit 43 is an affirmative determination (if AC power is received by secondary coil 31 in the second power reception determination), continuation determination unit 44 continues the connection state, Execute the power transmission process using the charging power.

  Next, the operation of this embodiment will be described with reference to FIGS. In addition, in FIG. 3 and FIGS. 6-8, while showing the aspect of the electric power value input into each primary side coil 22a, 22b and secondary side coil 31a, 31b, a communication aspect is shown by the arrow. In this case, for convenience of illustration, some arrows are appropriately shifted and shown even at the same timing. For example, in FIG. 3 etc., the timing at which the power transmission request signal is transmitted is different from the timing at which the identification power is input, but in practice it is substantially the same.

  Furthermore, in FIG. 3 and FIG. 6 to FIG. 8, the states (non-connection state, connection state, connection continuation state) of the power transmission devices 11 a and 11 b and the power reception devices 12 a and 12 b are shown together. In detail, a period in the connected state is indicated by a double-dotted line arrow, and a period in which the connection is continued is indicated by a dashed-dotted arrow. In addition, the period when the arrow of a dashed-dotted line and the arrow of a dashed-two dotted line are not described is a non-connecting state.

  First, as a first case (case), as shown in FIG. 4, it is assumed that the first vehicle C1 is disposed in the first parking space S1. In this case, at the timing when the first vehicle C1 is disposed in the first parking space S1, it is assumed that the power transmission devices 11a and 11b are in the unconnected state. Then, during power transmission to the power receiving device 12 mounted on the first vehicle C1 (hereinafter referred to as the first power receiving device 12a), the second vehicle C2 on which the power receiving device 12 (hereinafter referred to as the second power receiving device 12b) is mounted It shall be arrange | positioned at 2nd parking space S2.

  For convenience of description, in the following description, the secondary coil 31, the power receiving controller 35, and the power receiving communication unit 36 included in the first power receiving device 12a are referred to as a first secondary coil 31 a, a first power receiving controller It is referred to as 35a and the 1st power receiving side communication part 36a. The secondary side coil 31, the power receiving side controller 35 and the power receiving side communication unit 36 which the second power receiving apparatus 12b has are the second secondary coil 31b, the second power receiving side controller 35b and the second power receiving side communication unit 36b. .

  As shown in FIG. 3, when the first vehicle C1 is disposed in the first parking space S1, first, at time t1, the power transmission device by the grasping portion 41 of the first power reception device 12a (the first power reception controller 35a) 11 grasps are made. In detail, a search signal is transmitted by broadcast. In this case, since the power transmission devices 11a and 11b are not in the connection continuation state (the connection state is not connected), the search response signal is transmitted from the power transmission side communication units 24a and 24b. Thereby, the power transmission devices 11 a and 11 b are grasped by the grasping unit 41.

  Thereafter, as shown in FIGS. 3A and 3C, the connection state setting unit 42 of the first power receiving device 12a selects the second power transmitting device 11b of the power transmitting devices 11a and 11b at timing t2. It makes a selection request to the second power transmission apparatus 11b. In this case, since the second power transmission apparatus 11b is not in the connected state (is in the unconnected state), it responds to the connection request. Thereby, the 1st power receiving apparatus 12a and the 2nd power transmission apparatus 11b will be in a connection state.

  Thereafter, at time t3, a power transmission request signal is transmitted from the first power receiving communication unit 36a to the second power transmission communication unit 24b. As a result, the identification power is input to the second primary coil 22b for the first period T1. In this case, the transmission determination unit 43 of the first power receiving device 12a determines whether or not AC power is received by the first secondary coil 31a during the first period T1 (first power reception determination) It will be.

  Here, in the first case, since the first vehicle C1 is parked in the first parking space S1, even when the identification power is input to the second primary side coil 22b, The AC power is not received to the secondary side coil 31a of 1 or is small enough to be ignored. For this reason, the determination result of the first power reception determination is a negative determination indicating that the AC power is not received by the first secondary coil 31a. Then, at the timing of t4, the connection state between the first power receiving device 12a and the second power transmission device 11b is released.

  When the connection between the first power receiving device 12a and the second power transmission device 11b is released, the first power receiving device 12a is connected to another power transmission device 11 (first power transmission device 11a) in an unconnected state. Is possible. Therefore, as shown in FIGS. 3A and 3B, the connection state setting unit 42 of the first power receiving device 12a makes a connection request to the first power transmission device 11a at the timing of t5. The first power receiving device 12a and the first power transmission device 11a are in a connected state.

  Then, at time t6, a power transmission request signal is transmitted from the first power receiving communication unit 36a to the first power transmission communication unit 24a. As a result, the identification power is input to the first primary coil 22a for the first period T1. Then, the first power reception determination is performed by the transmission determination unit 43 of the first power receiving device 12a.

  Here, as shown in FIG. 3A and FIG. 3B, when the identification power is input to the first primary coil 22a, the identification power is input by the first secondary coil 31a. AC power corresponding to is received. As a result, the determination result of the first power reception determination of the transmission determination unit 43 of the first power receiving device 12a is a positive determination indicating that AC power is received by the first secondary coil 31a.

  If the determination result of the first power reception determination is a positive determination, the second power reception determination is performed. Specifically, the power transmission request signal is transmitted again at the timing of t7. As a result, the identification power is again input to the first primary coil 22a for the second period T2. In this case, a first interval period Ti1 from the input end timing of the first identification power to the input start timing of the second identification power (transmission timing of the second power transmission request signal) is the first power transmission device 11a. It is determined based on the unique information 23aa of.

  In addition, when the identification power is input again to the first primary coil 22a, the AC power is received again at the first secondary coil 31a, so the determination result of the second power reception determination is also positive. It becomes.

  Based on the fact that the determination result of the second power reception determination is an affirmative determination, it is determined that the first power reception device 12a and the first power transmission device 11a are a combination in which power transmission is performed. In this case, processing relating to setting of the connection continuation state is performed at timing t8, and the first power reception device 12a and the first power transmission device 11a enter the connection continuation state.

  After the connection continues, full power transmission is performed until the termination condition is satisfied. Specifically, at time t9, the charging power is input to the first primary side coil 22a (the charging power is output from the first power supply unit 21a). Then, the AC power corresponding to the charging power is received by the first secondary coil 31 a, and the AC power is used to charge the vehicle battery 33.

  In this state, the second vehicle C2 is disposed in the second parking space S2. And as shown in FIG.3 (d), grasping | ascertainment by the grasping | ascertainment part 41 of 2nd power receiving apparatus 12b (2nd power receiving side controller 35b) is performed at the timing of t10. Specifically, a search signal is transmitted by broadcast from the second power receiving side communication unit 36b.

  Here, the first power transmission device 11a is in the connection continuation state. For this reason, the search response signal is not transmitted from the first power transmission side communication unit 24a. On the other hand, since the second power transmission apparatus 11 b is in the unconnected state, the second power transmission communication unit 24 b transmits a search response signal.

  That is, from the power transmission device 11 grasped by the grasping unit 41, the one in the connection continuation state is excluded. On the other hand, among the plurality of power transmission devices 11, the unconnected state or the connected state is grasped by the grasping unit 41. Thereafter, setting of the connection state is performed.

  When the termination condition is satisfied at the timing of t11, the input of the charging power to the first primary side coil 22a is stopped. Note that after the input of the charging power is stopped, the connected state may be released, or the connected state may be continued until the first vehicle C1 exits (moves).

Next, a second case will be described using FIGS. 5 and 6.
As shown in FIG. 5, in the second case, the two vehicles C1 and C2 enter the parking spaces S1 and S2 almost simultaneously, and the first vehicle C1 is disposed in the first parking space S1, and the second parking space It is assumed that the second vehicle C2 is disposed at S2. Each of the power transmission devices 11a and 11b is in an unconnected state before each of the vehicles C1 and C2 enters.

  In such a configuration, power transmission is performed between the first power transmission device 11a (first primary coil 22a) and the first power reception device 12a (first secondary coil 31a), and the second power transmission device Power transmission is performed between 11 b (second primary coil 22 b) and the second power receiving device 12 b (second secondary coil 31 b).

  As shown in FIG. 6, first, at time t21, the grasping process by the grasping unit 41 of the first power receiving device 12a is performed, and the power transmission devices 11a and 11b are grasped. Similarly, the grasping process by the grasping unit 41 of the second power reception device 12b is performed at the timing of t22, and the power transmission devices 11a and 11b are grasped.

  Thereafter, as shown in FIG. 6A and FIG. 6D, the first power receiving device 12a and the second power transmission device 11b are connected at timing t23. Then, at the timing of t24, a power transmission request signal is transmitted from the first power receiving side communication unit 36a to the second power transmission side communication unit 24b. As a result, the identification power is input to the second primary coil 22b.

  Here, as shown in FIG. 6B and FIG. 6D, the connection state setting unit 42 of the second power reception device 12b makes a connection request to the second power transmission device 11b at timing t25. In this case, since the second power transmission apparatus 11b is already connected to the first power reception apparatus 12a, the second power transmission apparatus 11b rejects the connection request from the connection state setting unit 42 of the second power reception apparatus 12b. Therefore, the second power reception device 12b and the second power transmission device 11b do not enter the connection state.

  In this case, as shown in FIGS. 6B and 6C, the connection state setting unit 42 of the second power receiving device 12b makes a connection request to the first power transmission device 11a at the timing of t26. The second power reception device 12b and the first power transmission device 11a are in a connected state.

  As shown in FIGS. 6 (a) and 6 (d), when the identification power is input to the second primary coil 22b, the AC power is received by the first secondary coil 31a. I will not. Therefore, the determination result of the first power reception determination by the transmission determination unit 43 of the first power receiving device 12a is a negative determination. In this case, the connection state between the first power reception device 12a and the second power transmission device 11b is released at the timing of t27.

  Thereafter, as shown in FIGS. 6A and 6C, the connection state setting unit 42 of the first power receiving device 12a makes a connection request to the first power transmission device 11a at the timing of t28. In this case, since the first power transmission apparatus 11a is already in a connected state with the second power reception apparatus 12b, the first power transmission apparatus 11a rejects the connection request.

  Also, as shown in FIGS. 6 (b) and 6 (c), a power transmission request signal is transmitted from the second power receiving communication unit 36b to the first power transmission communication unit 24a at the timing of t29. The identification power is input to the primary side coil 22a. In this case, AC power is not received by the second secondary coil 31b. Therefore, the determination result of the first power reception determination by the transmission determination unit 43 of the second power reception device 12b is a negative determination. Therefore, at the timing of t30, the connection state between the second power reception device 12b and the first power transmission device 11a is released.

  Thereafter, as shown in FIGS. 6A and 6C, the connection state setting unit 42 of the first power receiving device 12a is at the timing of t31 which is a predetermined period apart from the timing of t28 when the connection request is rejected. Makes a connection request to the first power transmission device 11a again. In this case, since the first power transmission device 11a is in the unconnected state, the first power transmission device 11a responds to the connection request. Thereby, the 1st power receiving apparatus 12a and the 1st power transmission apparatus 11a will be in a connection state.

  Thereafter, as shown in FIG. 6B and FIG. 6D, the second power reception device 12b and the second power transmission device 11b are connected at timing t32. Then, as shown in FIGS. 6A and 6C, at the timing of t33, a power transmission request signal is transmitted from the first power receiving communication unit 36a to the first power transmission communication unit 24a. The identification power is input to the primary side coil 22a. In this case, as shown in FIG. 6A, AC power corresponding to the power for identification is received by the first secondary coil 31a. Therefore, the determination result of the first power reception determination is an affirmative determination, and the second power reception determination is performed. When the determination result of the second power reception determination is an affirmative determination, the connection state is continued.

  Further, as shown in FIGS. 6B and 6D, at the timing of t34, the power transmission request signal is transmitted from the second power receiving communication unit 36b to the second power transmission communication unit 24b, The identification power is input to the primary side coil 22b. In this case, as shown in FIG. 6B, the AC power corresponding to the power for identification is received by the second secondary coil 31b. Therefore, the determination result of the first power reception determination is an affirmative determination, and the second power reception determination is performed. When the determination result of the second power reception determination is an affirmative determination, the connection state is continued.

  As described above, when the second power transmission apparatus 11b is in a connection state with the first power reception apparatus 12a and a connection request is made from the second power reception apparatus 12b, the connection from the second power reception apparatus 12b is performed. Reject the request. That is, when the second power transmission apparatus 11b is in the connection state with the first power reception apparatus 12a, the second power transmission apparatus 11b is regulated so as not to be in the connection state with the second power reception apparatus 12b. Then, the rejected second power receiving apparatus 12b is connected to the first power transmitting apparatus 11a in the unconnected state.

  Thereafter, when it is determined that the combination is not the power transmission (when the determination result of the first power reception determination is a negative determination), the connection state is released. Then, the first power reception device 12a is connected to the first power transmission device 11a different from the second power transmission device 11b, and the second power reception device 12b is connected to the second power transmission device 11b different from the first power transmission device 11a. It will be connected. Then, the determination of the transmission determination unit 43 and the like are performed. Thereby, a series of processes from the setting of the connection state to the continuation determination by the continuation determination unit 44 are executed while differentiating the target power transmission devices to be in the connected state until the combination in which the power transmission is performed is understood.

  Next, the third case will be described with reference to FIG. In the third case, similarly to the second case, the two vehicles C1 and C2 enter the parking spaces S1 and S2 almost at the same time, and the first vehicle C1 is disposed in the first parking space S1, and the second parking space It is assumed that the second vehicle C2 is disposed at S2.

  As shown in FIG. 7, the grasping process by the grasping unit 41 of the first power receiving device 12a is executed at the timing of t41, and the grasping process by the grasping unit 41 of the second power receiving device 12b is executed at the timing of t42.

  After that, as shown in FIGS. 7A and 7D, the first power receiving device 12a and the second power transmission device 11b are connected at timing t43. Further, as shown in FIGS. 7B and 7C, the second power reception device 12b and the first power transmission device 11a are connected at timing t44.

  Then, at the timing of t45, a power transmission request signal from the first power receiving communication unit 36a to the second power transmission communication unit 24b, and a power transmission request signal from the second power reception communication unit 36b to the first power communication unit 24a Are sent simultaneously. In this case, identification power is simultaneously input to the primary coils 22a and 22b.

  In this case, AC power corresponding to the power for identification is simultaneously received by each of the secondary coils 31a and 31b. Then, as the first power receiving device 12a, it is falsely recognized that the AC power is received from the second power transmission device 11b connected to the first power receiving device 12a, so the determination result of the first power reception determination is an affirmative determination. Become. Similarly, the determination result of the first power reception determination in the second power receiving device 12b is a positive determination.

  Thereafter, the second power reception determination is performed in each of the power receiving devices 12a and 12b. In this case, the first interval period Ti1 determined based on the specific information 23aa of the first power transmission device 11a is different from the second interval period Ti2 determined based on the specific information 23bb of the second power transmission device 11b. Therefore, the transmission timing of the second transmission request signal is different.

  More specifically, as shown in FIGS. 7B and 7C, the second interval timing t47 after the first interval period Ti1 has elapsed from the timing t46 at which the first input of the identification power is completed. A power transmission request signal is transmitted from the power reception side communication unit 36b to the first power transmission side communication unit 24a, and a second identification power is input to the first primary side coil 22a. In this case, since the AC power is not received by the second secondary coil 31b, the determination result of the second power reception determination is a negative determination. Therefore, at time t48, the connection between the second power receiving device 12b and the first power transmission device 11a is released.

  Thereafter, as shown in FIG. 7A and FIG. 7D, at the timing of t49 when the second interval period Ti2 has elapsed from the timing of t46, the first power receiving communication portion 36a to the second power transmission communication portion A second power transmission request signal is transmitted to 24 b, and a second identification power is input to the second primary coil 22 b. In this case, since the AC power is not received by the first secondary coil 31a, the determination result of the second power reception determination is a negative determination. Therefore, at the timing of t50, the connection state between the first power receiving device 12a and the second power transmission device 11b is released.

  Here, since the difference between the interval periods Ti1 and Ti2 is longer than the second period T2, even if the first input start timing (the input end timing) of the identification power is identical, the second The input time of the identification power of That is, after the input of the identification power to the first primary coil 22a is completed, the identification power to the second primary coil 22b is started. As a result, a second may occur because the time when the identification power is input to the first primary coil 22a and the time when the identification power is input to the second primary coil 22b partially overlap. It is possible to suppress false recognition of the power reception determination.

  Next, a fourth case will be described with reference to FIG. In the fourth case, it is assumed that the first vehicle C1 enters the first parking space S1 shortly after the second vehicle C2 enters the second parking space S2.

  As shown in FIG. 8, the grasping process by the grasping unit 41 of the second power receiving device 12 b is executed at the timing of t 61, and the grasping process by the grasping unit 41 of the first power receiving device 12 a is executed at the timing of t 62.

  Thereafter, as shown in FIGS. 8B and 8D, the second power reception device 12b and the second power transmission device 11b are connected at timing t63, and the second power reception is received at timing t64. A first power transmission request signal is transmitted from the side communication unit 36 b to the second power transmission side communication unit 24 b. As a result, the first identification power is input to the second primary coil 22b, and AC power corresponding to the identification power is received by the second secondary coil 31b. Then, at the timing of t65, the first input of the identification power is stopped.

  Thereafter, as shown in FIGS. 8A and 8C, the first power reception device 12a and the first power transmission device 11a are connected at timing t66, and the first power reception is received at timing t67. A first power transmission request signal is transmitted from the side communication unit 36 a to the first power transmission side communication unit 24 a. Thereby, the first identification power is input to the first primary coil 22a, and the AC power corresponding to the identification power is received by the first primary coil 22a. Then, at the timing of t68, the first input of the identification power is stopped.

  Then, at the timing of t69, which is the timing at which the first interval period Ti1 has elapsed from the timing of t68 and the timing at which the second interval period Ti2 has elapsed from the timing of t65, the power receiving communication units 36a and 36b The second transmission request signal is transmitted. As a result, the second identification power is simultaneously input to each of the primary side coils 22a and 22b, and the AC power corresponding to the identification power is received by each of the secondary side coils 31a and 31b. In this case, the connection state is continued and power transmission processing using charging power is performed. That is, even if the timing when the second identification power is input to each of the primary coils 22a and 22b is the same, false recognition or the like does not easily occur.

According to the embodiment described above, the following excellent effects can be obtained.
(1) The power reception side controller 35 of the power reception device 12 includes the grasping unit 41 that grasps the plurality of power transmission devices 11. Then, in the contactless power transmission system 10, when the grasping unit 41 grasps the plurality of power transmission devices 11, the power transmission device 11 in the unconnected state and the unconnected state among the plurality of power transmission devices 11 grasped by the grasping unit 41 are not The connection state setting unit 42 sets the power reception device 12 in the connection state to the connection state in which the connection via the power transmission side communication unit and the power reception side communication unit 36 is established. The non-contact power transmission system 10 includes a transmission determination unit 43 that determines whether power transmission is performed between the power transmission device 11 and the power reception device 12 in the connected state. In addition, when the determination result by the transmission determination unit 43 is a positive determination (when power transmission is performed), the contactless power transmission system 10 continues the connection state, while the determination result of the transmission determination unit 43 is a negative determination. In the case (the power transmission is not performed), the continuation determination unit 44 that cancels the connection state is provided.

  According to this configuration, after the power transmission device 11 and the power reception device 12 among the plurality of power transmission devices 11 are in the connected state, the determination by the transmission determination unit 43 is performed. Then, when it is determined by the transmission determination unit 43 that power transmission is to be performed, the connection state is continued. Thus, power can be transmitted between the power transmission device 11 and the power reception device 12 in the connection continuation state while exchanging information as they are.

  Further, targets to be set to the connection state by the connection state setting unit 42 are the power transmission device 11 in the unconnected state and the power reception device 12 in the unconnected state. As a result, the power transmission device 11 and the power reception device 12 in the connection state are restricted from being in the connection state with other devices until the connection state is released. Thus, for example, it is possible to suppress a situation in which a combination in which power transmission is performed can not be grasped due to the power reception device 12 being simultaneously connected to the plurality of power transmission devices 11.

  In particular, if the power reception device 12 overlaps with the plurality of power transmission devices 11 to be in a connected state, and a power transmission request signal is simultaneously transmitted from one power reception device 12 to the plurality of power transmission devices 11, the plurality of primary coils AC power is input at the same time. In this case, the input pattern (for example, input time etc.) of the AC power input to each primary coil is made different in order to grasp which primary coil among the plurality of primary coils receives power. A need arises. Then, the control may be complicated. On the other hand, in the present embodiment, it may be determined whether or not the power transmission is performed between the one power transmitting device 11 and the power receiving device 12 already in the connected state. Can be

  (2) The grasping unit 41 has a power transmission side communication unit (for example, the first power transmission side communication unit 24a) capable of wireless communication with the power reception side communication unit 36 among the plurality of power transmission devices 11, and the connection continuation state It grasps other things (i.e., the unconnected or connected power transmission device 11). As a result, since the power transmission devices 11 in the connection continuation state are excluded from the grasped objects of the grasping unit 41, the number of the power transmission devices 11 to be grasped can be reduced. Therefore, the setting of the connection state and the number of determinations by the transmission determination unit 43 can be reduced, and the time required to grasp the combination in which the power transmission is performed can be shortened.

  Note that the power transmission device 11 in the connection continuation state has already been determined by the transmission determination unit 43 to be a combination in which power transmission is performed with another power reception device 12, so power transmission with the current power reception device 12 is performed. It can not be the combination to be performed. Therefore, there is no problem even if it is excluded from the targets for grasping.

  On the other hand, the power transmission device 11 in the connection state may be released from the connection state depending on the determination result of the transmission determination unit 43. Then, the power transmission device 11 in the connection state can be a combination in which power transmission is performed with the current power reception device 12. Therefore, the combination in which electric power transmission is performed can be suitably grasped | ascertained by including the power transmission apparatus 11 of the above connection states in grasping | ascertainment object.

  (3) The grasping unit 41 controls the power receiving side communication unit 36 so that the search signal is transmitted as the response request signal. The power transmission side controllers 23a and 23b as the power transmission side control unit search when the power transmission side communication units 24a and 24b receive the search signal in the non-connection continuous state (the unconnected state or the connected state). The power transmission side communication units 24 a and 24 b are controlled to transmit a response signal to the power reception side communication unit 36. On the other hand, when the power transmission side communication units 24 a and 24 b receive the search signal in the state where the power transmission side controllers 23 a and 23 b are in the connection continuation state, the power transmission side communication units 24 a and 24 b do not transmit the search response signal. Control. Thus, the power transmission device 11 in the connection continuation state is excluded from the targets to be grasped by the grasping unit 41. Therefore, the effect of (2) can be obtained relatively easily.

  (4) The connection state setting unit 42, when the connection state is released by the continuation determination unit 44, is in a non-connected state different from the power transmission device 11 (for example, the first power transmission device 11a) whose connection state is released. The power transmission device 11 (for example, the second power transmission device 11b) and the power reception device 12 in the unconnected state are set in the connected state. Then, the determination by the transmission determination unit 43 targeting the power transmission device 11 and the power reception device 12 newly set in the connection state, and the determination by the continuation determination unit 44 are performed. Thus, the determination by the transmission determination unit 43 and the continuation determination unit 44 is sequentially performed until the combination in which the power transmission is performed is grasped, so that the combination in which the power transmission is performed can be suitably grasped.

  (5) The transmission determination unit 43 performs the first period during which the identification power is applied to the primary coil (for example, the first primary coil 22a) of the power transmission device 11 (for example, the first power transmission device 11a) in the connected state. The power transmission device 11 in the connected state is controlled so as to be input over T1. Further, the transmission determination unit 43 performs the first power reception determination to determine whether the AC power is received by the secondary coil 31 when the identification power is input to the primary coil. Then, when the determination result of the first power reception determination is a positive determination, the transmission determination unit 43 again performs the identification power for the second period T2 with respect to the primary coil of the power transmission device 11 in the connected state. The power transmission device 11 in the connected state is controlled so as to be input, and the second power reception determination is performed to determine whether AC power is received by the secondary coil 31. As a result, even if the determination result of the first power reception determination is erroneously determined to be a positive determination due to an erroneous detection of the detection unit 34 or the like, the determination result of the second power reception determination may be a negative determination. Therefore, the determination accuracy of the transmission determination unit 43 can be improved.

  (6) Interval periods Ti1 and Ti2 from the first input power for identification power input end to the second input power for identification power input are different for each of the plurality of power transmission devices 11a and 11b. Thereby, as shown in the third case, the determination result of the first power reception determination is caused temporarily because the first identification power is simultaneously input to the two primary coils 22a and 22b. Since the input start timing of the second power for identification is different even if it is affirmative determination by mistake, the determination result of the second power reception determination may be negative determination. Therefore, the determination accuracy of the transmission determination unit 43 can be improved.

  (7) In particular, in order to make the period from the input start timing of the first identification power to the input start timing of the second identification different, the configuration in which the interval periods Ti1 and Ti2 are different not the first period T1 It was adopted. As a result, it is possible to suppress an increase in the first period T1 in order to make the first period T1 different. Therefore, it is possible to suppress an increase in time required for the first power reception determination and an increase in unnecessary power consumption.

  (8) The interval periods Ti1 and Ti2 are determined based on the specific information 23aa and 23bb of the power transmission devices 11a and 11b set in the connection state. Thereby, interval period Ti1, Ti2 can be easily varied for every power transmission apparatus 11a, 11b.

  (9) The difference between the first interval period Ti1 of the first power transmission device 11a and the second interval period Ti2 of the second power transmission device 11b is longer than the second period T2. Thereby, even if the input end timing of the first identification power to each primary coil 22a, 22b is the same, the second identification power is input to each primary coil 22a, 22b. Time does not overlap. Therefore, it is possible to suppress an erroneous determination of the second power reception determination that is caused by overlapping of the time during which the second identification power is input to each of the primary side coils 22a and 22b.

  Further, with the above configuration, it is not necessary to consider the timing at which the received power is detected as the second received power determination, and it may be simply determined whether or not it is detected. Therefore, the second power reception determination can be easily performed.

  (10) In the case where contactless power transfer system 10 determines that the connection state is to be continued by continuation determination unit 44, primary of power transmission device 11 in the connection continuation state is established until a predetermined termination condition is satisfied. Power for transmission (charging power) having a power value larger than that for identification is input to the side coil (for example, the first primary coil 22a). Thereby, it is avoided that the charging power is input to the primary side coil even though the combination is not the power transmission. Thus, unnecessary power loss can be avoided.

  (11) The connection state setting unit 42 sequentially requests connection to the plurality of power transmission devices 11 grasped by the grasping unit 41 until the power transmission device 11 in the unconnected state is found (until the connection response signal is received) Do. Accordingly, the connection state can be set without waiting for the connection state of the power transmission device 11 in the connection state to be released, and the transmission determination unit 43 can perform the determination and the like. Thereby, the combination in which the power transmission is performed can be grasped at an early stage.

The above embodiment may be modified as follows.
○ The power transmission side controllers 23a and 23b control the power transmission side communication units 24a and 24b so that the beacons are periodically transmitted in the non-connection continuous state and the beacons are not periodically transmitted in the connection continuous state. It may be In this case, the grasping unit 41 of the power reception side controller 35 may be configured to grasp the power transmission device 11 based on the reception of the beacon by the power reception side communication unit 36. Thereby, the power transmission device 11 can be grasped without transmitting the search signal.

  The connection state setting unit 42 may be configured to preferentially make a connection request in descending order of the reception intensity of the search response signal when there are a plurality of power transmission devices 11 in the unconnected state. As a result, the connection request can be made sequentially from the power transmission device 11 present near the power reception device 12.

  ○ When the power transmission device 11 makes a connection request from another power reception device 12 other than the power reception device 12 related to the connection continuation state after transitioning from the connection state to the connection continuation state, the connection is refused and the connection continuation state May be notified that the In this case, when the other power receiving apparatus 12 receives the notification, the other power receiving apparatus 12 may exclude the power transmission apparatus 11 that has issued the notification from the connection request. This can avoid useless connection requests.

  The power transmission side controllers 23a and 23b may be configured to include the connection state setting unit 42, the transmission determination unit 43, and the continuation determination unit 44. In this case, the power reception side controller 35 may use the power reception side communication unit 36 to transmit information (for example, detection results of the detection unit 34) necessary for various determinations to the power transmission side controllers 23a and 23b. It should be noted that the transmission side controllers 23a and 23b and the power reception side controller 35 are different from each other in that setting of the connection state and various determinations are performed by exchanging various request signals and various response signals in response to the various request signals. In cooperation, it can be said that the connection state setting unit 42, the transmission determination unit 43, and the continuation determination unit 44 are provided.

  ○ The power value of the first identification power (first identification power) and the power value of the second identification power (second identification power) may be the same or different. Good. Further, the power value of the identification power is smaller than the power value of the charging power, but is not limited to this and may be the same.

The first period T1 and the second period T2 may be identical or different.
The difference between the first interval period Ti1 and the second interval period Ti2 may be less than the second period T2. Even in this case, the second input start timing of the identification power is different. Therefore, it is preferable to determine whether or not the combination is correct by collating the second input start timing of the identification power with the detection start timing of the received power.

  The interval periods Ti1 and Ti2 may be determined based on the unique information of the power receiving devices 12a and 12b instead of (or in addition to) the unique information 23aa and 23bb of the power transmission devices 11a and 11b.

  The detection unit 34 detects the AC power received by the secondary coil 31. However, the present invention is not limited to this. The detection unit 34 may be configured to detect DC power obtained by converting the AC power.

  In the embodiment, the first identification power is stopped when it is input for the first period T1. However, the present invention is not limited thereto. A stop request signal is received from the power receiving communication unit 36 The input of the identification power may be continued. In this case, the power reception side controller 35 may control the power reception side communication unit 36 such that the stop request signal is transmitted when AC power is not received for a predetermined period after the transmission of the power transmission request signal.

  ○ Instead of making each interval period Ti1 and Ti2 different, even if the interval period is the same regardless of each power transmission device 11, the first period T1 is different for each of the plurality of power transmission devices 11 Good. Even in this case, since the input start timing of the second identification power is different even when the first identification power input start timing is simultaneous, the erroneous determination of the transmission determination unit 43 can be suppressed. The point is that the period from the input start timing of the first identification power to the input start timing of the second identification power may be different for each of the plurality of power transmission devices 11.

  In the configuration in which the first period T1 is different, the first period T1 may be determined based on the specific information 23aa and 23bb. Further, the difference between the first period T1 corresponding to the first power transmission device 11a and the first period T1 corresponding to the second power transmission device 11b may be set longer than the second period T2.

  ○ The resonant frequency of the resonant circuit including the first primary side coil 22a (or the resonant circuit including the second primary side coil 22b) and the resonant frequency of the resonant circuit including the secondary side coil 31 are power transfer May be different to the extent possible.

○ The primary and secondary capacitors may be omitted. In this case, magnetic field resonance may be performed using parasitic capacitances of the primary side coils 22a and 22b and the secondary side coil 31.
The AC power received by the secondary coil 31 may be used for applications other than charging of the vehicle battery 33.

The mounting target of the power receiving device 12 is arbitrary, and may be mounted on, for example, a robot or an electric wheelchair.
The number of power transmission devices 11 is not limited to two and is arbitrary.

  The first power transmission device 11a may have a resonant circuit including the first primary coil 22a and the primary capacitor, and a primary coupling coil coupled to the resonant circuit by electromagnetic induction. . The same applies to the second power transmission device 11b. The power reception device 12 may be configured to have a resonant circuit including the secondary coil 31 and the secondary capacitor, and a secondary coupling coil coupled to the resonant circuit by electromagnetic induction.

  The grasping unit 41 is configured to grasp the power transmission device 11 in the unconnected state or in the connected state. However, the present invention is not limited to this, and may be configured to grasp only the power transmission device 11 in the unconnected state. In detail, when the power transmission side communication units 24 a and 24 b receive the search signal in the unconnected state, the power transmission side controllers 23 a and 23 b transmit the search response signal to the power reception side communication unit 36. Control the power transmission side communication units 24a and 24b. On the other hand, when the power transmission side communication units 24a and 24b receive the search signal in the connection state or the connection continuation state, the power transmission side controllers 23a and 23b do not transmit the search response signal. You may control 24a and 24b. Thereby, only the power transmission device 11 in the unconnected state is grasped by the grasping unit 41.

  In short, the grasping unit 41 has a power transmission side communication unit capable of wireless communication with the power reception side communication unit 36 among the plurality of power transmission devices 11 grasped by the holding unit 41, and at least excluding the connection continuation state. It is good to understand the unconnected state. In other words, at least the connection continuation state may be excluded from the grasping targets of the grasping unit 41. Further, when the power transmission side communication units 24a and 24b receive the search signal in the state where at least the power transmission side controllers 23a and 23b are in the non-connection state except the connection continuation state, the power transmission side controllers 23a and 23b receive the search signal from the power transmission side communication units 24a and 24b. The power transmission side communication units 24 a and 24 b may be controlled to transmit the search response signal to the power reception side communication unit 36.

  ○ The second power reception determination may be omitted. The transmission determination unit 43 controls the power transmission device 11 in the connection state so that the identification power is input to the primary coil of the power transmission device 11 in the connection state, and the identification power is input to the primary side coil. In the case where it is determined, the power reception determination as to whether or not the AC power is received by the secondary side coil 31 may be performed. In this case, the transmission determination unit 43 determines that the power transmission is performed when the AC power is received by the secondary coil 31, and the AC power is not received by the secondary coil 31. It may be determined that power transfer is not performed. According to this configuration, the time required for the determination of the transmission determination unit 43 can be shortened.

Next, preferable examples that can be grasped from the above-described embodiment and another example will be described below.
The contactless power transmission according to claim 5, wherein the period from the input start timing of the first identification power to the input start timing of the second identification power is different for each of the plurality of power transmission devices. system.

  (B) The first period is the same for the plurality of power transmission devices, and the interval period from the input end timing of the first identification power to the input start timing of the second identification power is the plurality of the first period. The contactless power transmission system as described in (a) which is different for every power transmission apparatus.

  (Iii) The contactless power transmission system according to (ii), wherein the interval period is determined based on the unique information of the power transmission device.

  DESCRIPTION OF SYMBOLS 10 Contactless power transmission system 11 Power transmission device 11a 1st power transmission device 11b 2nd power transmission device 12 Power reception device 12a 1st power reception device 12b 2nd power reception device 22a, 22b Primary coil, 23a, 23b ... Power transmission controller, 24a, 24b ... Power transmission communication unit, 31 (31a, 31b) ... Secondary coil, 35 (35a, 35b) ... Power reception controller, 36 (36a, 36b) ) Power reception side communication unit, 41 ... grasping unit, 42 ... connection state setting unit, 43 ... transmission determination unit, 44 ... continuation determination unit.

Claims (8)

A plurality of power transmission devices each having a primary side coil to which AC power is input from a power supply unit which is an internal power supply of the power transmission device , and a power transmission side communication unit which performs wireless communication
A contactless power transfer system comprising: a secondary coil capable of contactlessly receiving the AC power input to the primary coil; and a power receiving device having a power receiving communication unit for performing wireless communication,
The power reception device includes a grasping unit that grasps the communicable power transmission device.
The contactless power transfer system is
When a plurality of power transmission devices are grasped by the grasping unit, one power transmission device is selected from the plurality of power transmission devices grasped by the grasping unit, and the one power transmission device and the power reception device are A connection state setting unit configured to set a connection state in which connection via the power transmission side communication unit and the power reception side communication unit is established;
A transmission determination unit that determines whether it is possible to perform power transmission between the power transmission device and the power reception device in the connection state;
The one that when the power transmission is determined to be a line Ukoto by the transmission determination unit continues the connection state, if the power transmitted by the transmission determination unit is determined row Ukoto is not possible And a continuation judging unit for canceling the connection state,
Assuming that the state in which the continuation determination unit determines that the connection state is to be continued is the connection continuation state, and the state not in the connection state and not in the connection continuation state is in the non-connection state,
The grasping portion has the power transmission side communication portion capable of wireless communication with the power reception side communication portion among the plurality of power transmission devices, and grasps at least one of the unconnected state excluding the connection continuation state. To be
Said connection state setting unit, wherein the power transmission device of the one chosen from among the power transmission device of the unconnected state of being grasped by the grasping portion, and the power receiving device, and Turkey be set in the connected state Contactless power transmission system.   The grasping unit grasps, among the plurality of power transmission devices, one having the power transmission side communication unit capable of wireless communication with the power reception side communication unit in the unconnected state or the connected state. The contactless power transmission system described in. The grasping unit controls the power receiving side communication unit so that a predetermined response request signal is transmitted.
The power transmission device receives the response signal from the power transmission side communication unit when the response request signal is received by the power transmission side communication unit in the status of at least the unconnected state except the connection continuation state. When the response request signal is received by the power transmission side communication unit while transmitting to the communication unit, the power transmission side communication unit transmits the response signal to the power reception side communication unit. And a power transmission side control unit that controls the power transmission side communication unit not to
The grasping unit has the power transmission side communication unit capable of wireless communication with the power reception side communication unit among the plurality of power transmission devices based on the response signal received by the power reception side communication unit. The contactless power transfer system according to claim 1 or 2, wherein at least the unconnected state excluding the continuous state of connection is grasped.   The connection state setting unit, in the case where the connection state is released by the continuation determination unit, the power transmission device in the unconnected state and the power reception device different from the power transmission device in which the connection state is released. The contactless energy transfer system according to any one of claims 1 to 3, wherein the contact state is set. The transmission determination unit
With respect to the primary coil of the power transmission apparatus of the connection state, the first identification power as the first AC power to determine whether the received at secondary coil is pre SL over a first period controlling power transmission device of the connection state so as to input from the power supply unit, the first identification power is receiving AC power by said secondary coil when it is input to the primary coil A first power reception determination that determines whether or not
When it is determined by the first power reception determination that AC power is received, it is determined again whether the secondary coil receives power to the primary coil of the power transmission device in the connected state. second identification power as the second AC power by controlling the power transmission device of the connection state so as to input from the second pre-Symbol power unit over a period, the second identification power the for 1 Performing a second power reception determination to determine whether or not AC power is received by the secondary coil when being input to the secondary coil;
When it is determined that AC power is received by the second power reception determination, while it is determined that the power transmission is performed, while it is determined that AC power is not received by the second power reception determination The contactless power transmission system according to any one of claims 1 to 4, wherein it is determined that the power transmission is not performed. The transmission determination unit, an input to the primary coil of the power transmission apparatus of the connection state, the identification power as AC power to determine whether the received at the secondary coil before Symbol supply unit Control to control the power transmission device in the connected state so as to determine whether AC power is received by the secondary coil when the identification power is input to the primary coil To make a decision,
The transmission determination unit determines that the power transmission is performed when it is determined that the AC power is received by the secondary coil by the reception determination, while the transmission determination unit determines the secondary side by the reception determination. The non-contact power transmission system according to any one of claims 1 to 4, wherein it is determined that the power transmission is not performed when it is determined that AC power is not received by a coil.   In the noncontact power transmission system, when the continuation determination unit determines that the connection state is to be continued, the primary coil of the power transmission device in the connection continuation state is established until a predetermined termination condition is satisfied, The contactless power transmission system according to claim 5 or 6, wherein power for transmission is input as the AC power. A power receiving apparatus capable of receiving AC power without contact from a power transmission apparatus having a primary side coil to which AC power is input from a power supply section which is an internal power supply of the power transmission apparatus and a power transmission side communication section performing wireless communication
A secondary coil capable of receiving the AC power input to the primary coil;
A power receiving side communication unit that performs wireless communication;
A grasping unit that grasps the communicable power transmission device;
When a plurality of power transmission devices are grasped by the grasping unit, one power transmission device is selected from the plurality of power transmission devices grasped by the grasping unit, and the one power transmission device and the power reception device are A connection state setting unit configured to set a connection state in which connection via the power transmission side communication unit and the power reception side communication unit is established;
A transmission determination unit that determines whether it is possible to perform power transmission between the power transmission device and the power reception device in the connection state;
The one that when the power transmission is determined to be a line Ukoto by the transmission determination unit continues the connection state, if the power transmitted by the transmission determination unit is determined row Ukoto is not possible And a continuation judging unit for canceling the connection state,
Assuming that the state in which the continuation determination unit determines that the connection state is to be continued is the connection continuation state, and the state not in the connection state and not in the connection continuation state is in the non-connection state,
The grasping portion has the power transmission side communication portion capable of wireless communication with the power reception side communication portion among the plurality of power transmission devices, and grasps at least one of the unconnected state excluding the connection continuation state. To be
Said connection state setting unit, wherein the power transmission device of the one chosen from among the power transmission device of the unconnected state of being grasped by the grasping portion, and the power receiving device, and Turkey be set in the connected state Power receiving device.