JP2015107026A - Non-contact power transmission system and power reception device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power transmission system and a power reception device that can preferably learn a combination of a power transmission device and the power reception device between which power transmission is executed.SOLUTION: A non-contact power transmission system 10 comprises: a first power transmission device 11a including a first primary coil 22a into which AC power is input; and a second power transmission device 11b including a second primary coil 22b into which AC power is input. In addition, the non-contact power transmission system 10 comprises a power reception device 12 including a secondary coil 31 capable of receiving AC power in a non-contact manner from any of the primary coils 22a, 22b.

Description

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

  As a non-contact 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 AC power is input and a secondary side that can receive AC power in a non-contact manner from the primary coil What is provided with the power receiving apparatus which has a coil is known (for example, refer patent document 1). In such a non-contact power transmission system, for example, AC power is transmitted from the power transmission device to the power reception device in a non-contact manner by causing magnetic resonance between the primary coil and the secondary coil. The AC power received by the power receiving device is used, for example, for charging a vehicle battery of a vehicle on which the power receiving device is mounted.

JP 2009-106136 A

  Here, a plurality of power transmission devices may be provided in 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 power transmission device and the power receiving device among the plurality of power transmission devices perform power transmission.

  An object of the present invention is made in view of the above-described circumstances, and is to provide a non-contact power transmission system and a power receiving apparatus that can appropriately grasp a combination of a power transmitting apparatus and a power receiving apparatus in which power transmission is performed. .

  A non-contact power transmission system that achieves the above object is capable of receiving a plurality of power transmission devices having a primary coil to which AC power is input, and the AC power input to the primary coil in a non-contact manner. A power receiving device having a secondary coil, and the power receiving device includes a grasping unit that grasps the power transmission device, and the non-contact power transmission system is configured to recognize a plurality of power transmission devices by the grasping unit. Includes a transmission determination unit that determines whether power transmission is performed between the target power transmission device and the power reception device among the plurality of power transmission devices grasped by the grasping unit, and the transmission determination unit includes: The target power transmission apparatus is controlled so that the first identification power is input as the AC power over the first period to the primary coil of the target power transmission apparatus, and the first identification power is The primary carp When it is determined that the AC power is received by the first power reception determination and the first power reception determination that determines whether or not AC power is received by the secondary side coil. The second identification is controlled again so that the second identification power is input as the AC power over the second period to the primary coil of the target power transmission apparatus. And second power reception determination for determining whether or not AC power is received by the secondary coil when power is input to the primary coil, and the second power reception determination When it is determined that AC power is being received by the secondary side coil, it is determined that the power transmission is performed, while AC power is received by the secondary side coil by the second power reception determination. Have If it is determined that the power transmission is not performed, the period from the input start timing of the first identification power to the input start timing of the second identification power is It is different for each of a plurality of power transmission devices.

  According to this configuration, the transmission determination unit performs the first power reception determination using the first identification power with any one of the plurality of power transmission devices as the target power transmission device, and the determination result of the first power reception determination is If the determination is affirmative, a second power reception determination using the second identification power is performed. Then, when the determination result of the second power reception determination is an affirmative determination, it is determined that power transmission is performed between the target power transmission device and the power reception device. Thereby, the combination in which electric power transmission is performed can be grasped suitably.

  Here, 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. Thereby, even if the determination result of the first power reception determination is erroneously affirmative determination due to the fact that the first identification power is simultaneously input to the two primary coils, Since the input start timing of the second identification power is different, the determination result of the second power reception determination can be a negative determination. Therefore, it is possible to improve the determination accuracy of the transmission determination unit.

  In the non-contact power transmission system, the first period is the same in the plurality of power transmission devices, and an interval period from the input end 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. According to such a configuration, since it is not necessary to change the first period, inconveniences caused by changing the first period, for example, the first period becomes longer to change the first period, and as a result, the first power reception determination is made. It can be suppressed that the time required is increased or the wasteful power consumption is increased.

  About the said non-contact electric power transmission system, the said interval period is good to be determined based on the specific information of the said power transmission apparatus. According to such a configuration, the interval period is determined based on the unique information of the power transmission device. Thereby, an interval period can be easily changed for every some power transmission apparatus.

  About the non-contact power transmission system, the plurality of power transmission devices include a first power transmission device and a second power transmission device, a first interval period of the first power transmission device, a second interval period of the second power transmission device, and The difference may be longer than the second period. According to this configuration, even if the input end timing of the first identification power to the primary coil of each power transmission device is the same, the second identification power is input to the primary coil of the first power transmission device. And the time when the second identification power is input to the primary coil of the second power transmission device do not overlap. As a result, it is possible to suppress erroneous determination of the second power reception determination due to a part of the time during which the second identification power is input.

  Regarding the non-contact power transmission system, each of the plurality of power transmission devices includes a power transmission side communication unit that performs wireless communication, the power reception device includes a power reception side communication unit that performs wireless communication, and the contactless power transmission system includes: A connection state setting unit that sets the target power transmission device and the power reception device to a connection state in which connection via the power transmission side communication unit and the power reception side communication unit is established, and the connection state setting unit is set to the connection state The target power transmission device is restricted from being in the connection state with the other power receiving device until the connection state is released, and the transmission determination unit is set by the connection state setting unit. It is good to determine whether electric power transmission is performed between the said target power transmission apparatus set to the said connection state, and the said power receiving apparatus based on. According to such a configuration, the determination by the transmission determination unit is performed based on the target power transmitting device and the power receiving device being set to the connected state. The target power transmitting device that is in a connected state is restricted from being connected to another power receiving device until the connected state is released. Thereby, for example, the determination by the transmission determination unit for one power transmission device and a plurality of power reception devices is not performed. Therefore, erroneous determination of the transmission determination unit can be suppressed.

  A power receiving device that achieves the above object is capable of receiving AC power in a non-contact manner from a power transmission device having a primary side coil to which AC power is input and a power transmission side communication unit that performs wireless communication, A secondary coil capable of receiving the AC power input to the primary coil, a grasping unit for grasping the power transmission device, and a plurality of the power transmission devices by the grasping unit, the grasping unit A transmission determination unit that determines whether or not power transmission is performed between the target power transmission device and the power reception device among the plurality of power transmission devices grasped by the transmission determination unit, wherein the transmission determination unit includes the target power transmission Instructing the target power transmitting apparatus to input first identification power to the primary coil of the apparatus over a first period, and inputting the first identification power to the primary coil The secondary side carp The first power reception determination for determining whether or not AC power is received by the first power reception and the target power transmission again when it is determined by the first power reception determination that the AC power is received by the secondary coil. Instructing the target power transmitting apparatus to input a second identification power to the primary coil of the apparatus over a second period, and inputting the second identification power to the primary coil And the second power reception determination for determining whether or not the AC power is received by the secondary side coil when the AC power is received by the secondary side coil by the second power reception determination. When it is determined that power is being received, it is determined that the power transmission is performed, while when it is determined by the second power reception determination that AC power is not received by the secondary coil, Said 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. It is characterized by that.

  According to this configuration, the transmission determination unit performs the first power reception determination using the first identification power with any one of the plurality of power transmission devices as the target power transmission device, and the determination result of the first power reception determination is If the determination is affirmative, a second power reception determination using the second identification power is performed. A 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. Thereby, even if the determination result of the first power reception determination is erroneously affirmative determination due to the fact that the first identification power is simultaneously input to the two primary coils, Since the input start timing of the second identification power is different, the determination result of the second power reception determination can be a negative determination. Therefore, it is possible to improve the determination accuracy of the transmission determination unit.

  According to this invention, the combination of the power transmission apparatus and power receiving apparatus in which electric power transmission is performed can be grasped | ascertained suitably.

The perspective view which shows the outline | summary of a non-contact electric power transmission system. The block diagram which shows the electric constitution of a non-contact electric power transmission system. It is a timing chart which shows a 1st case, (a) shows the power reception aspect of a 1st power receiving apparatus, (b) shows the power transmission aspect of a 1st power transmission apparatus, (c) is the power transmission aspect of a 2nd power transmission apparatus. (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 a 2nd case, (a) shows the power reception aspect of a 1st power receiving apparatus, (b) shows the power reception aspect of a 2nd power receiving apparatus, (c) is the power transmission aspect of a 1st power transmission apparatus. (D) shows the power transmission mode of the second power transmission device. It is a timing chart which shows a 3rd case, (a) shows the power reception aspect of a 1st power receiving apparatus, (b) shows the power reception aspect of a 2nd power receiving apparatus, (c) is the power transmission aspect of a 1st power transmission apparatus. (D) shows the power transmission mode of the second power transmission device. It is a timing chart which shows a 4th case, (a) shows the power reception aspect of a 1st power receiving apparatus, (b) shows the power reception aspect of a 2nd power receiving apparatus, (c) is the power transmission aspect of a 1st power transmission apparatus. (D) shows the power transmission mode of the second power transmission device.

Hereinafter, an embodiment in which the non-contact power transmission system is applied to a vehicle will be described.
As shown in FIG. 1, the contactless power transmission system 10 includes a power transmission device 11 (charging station) and a power reception device 12 (vehicle side device) that can transmit power without contact. The power receiving device 12 is mounted on the vehicle C.

  A plurality of power transmission devices 11 are installed corresponding to a plurality of parking spaces S1 and S2 in which the vehicle C can be parked. In this case, for convenience of explanation, the power transmission device 11 installed in the vicinity of the first parking space S1 is referred to as a first power transmission device 11a, and the power transmission device 11 installed in the vicinity of the second parking space S2 is referred to as a second power transmission device 11b. That's it. Each power transmission apparatus 11a, 11b is the same.

  As shown in FIG. 2, the first power transmission device 11 a includes a first power supply unit 21 a that can output AC power having a predetermined frequency. The 1st power supply part 21a converts the system electric power input from the system power supply E as an infrastructure into alternating current power, and outputs the converted alternating current power. And the 1st power transmission apparatus 11a is provided with the 1st primary side coil (power transmission part) 22a into 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 side controller 23a as a power transmission side control unit that performs various controls of the first power transmission device 11a, and a first power transmission side 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 configured 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 a second power supply unit 21b, a second primary coil 22b, a second power transmission side controller 23b, and a second power transmission side communication unit 24b. Since these structures are the same as each structure of the 1st power transmission apparatus 11a, description is abbreviate | omitted.

  Here, as shown in FIG. 1, each primary side coil 22a, 22b is arrange | positioned 1 each in each parking space S1, S2. 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 in a non-contact manner from any of the primary coils 22a and 22b. Each primary side coil 22a, 22b and the secondary side coil 31 are comprised so that magnetic field resonance is possible. For example, a primary side capacitor (not shown) is connected to each primary side coil 22a, 22b in series or in parallel, and a resonance circuit is formed. Similarly, a secondary capacitor (not shown) is connected to the secondary coil 31 in series or in parallel to form a resonance circuit. The resonance frequency of the resonance circuit including the first primary coil 22a, the resonance circuit including the second primary coil 22b, and the resonance circuit including the secondary coil 31 are set to be the same.

  According to such a configuration, in a situation where the secondary coil 31 is disposed at a position where magnetic resonance can occur with either of the primary coils 22a and 22b, AC power is supplied to the primary coil capable of magnetic resonance. When input, the resonance circuit including the primary side coil and the resonance circuit including the secondary side coil 31 perform magnetic field resonance. Thereby, the secondary coil 31 receives AC power from the primary coil in a non-contact manner. The frequency of the AC power output from each of the power supply units 21a and 21b may be set to be the same as or close to the resonance frequency of each of the resonance circuits.

  As shown in FIG. 1, the secondary coil 31 is disposed at a position where it can be opposed to any one of the primary coils 22 a and 22 b, specifically, at the bottom of the vehicle C. When the vehicle C is parked in one of the parking spaces S1 and S2, the secondary coil 31 is opposed to the primary coil installed in the parked parking space, and the primary side It is arranged at a position where magnetic 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 that receives DC power rectified by the rectifier 32. Yes. Thereby, the vehicle battery 33 is charged.

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

  The power receiving device 12 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 side controller 35. Thereby, the power receiving side controller 35 can grasp | ascertain the charge condition of the battery 33 for vehicles.

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

  In addition, the wireless communicable range of each power transmission side communication part 24a, 24b and the power receiving side communication part 36 is set wider than 1st parking space S1 and 2nd parking space S2. For this reason, in the present embodiment in which a 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 receiving 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 24a and the second power transmission side communication unit 24b) of the plurality of power transmission apparatuses 11. For example, Bluetooth (registered trademark), Zigbee (registered trademark), Wi-fi, or the like can be considered as a communication method of each of the communication units 24a, 24b, and 36.

  The non-contact power transmission system 10 of this embodiment has a configuration for grasping a combination of a power transmission device 11 and a power reception device 12 that perform power transmission. This configuration will be described in detail below.

  As illustrated in FIG. 2, the power receiving side controller 35 includes a grasping unit 41 that grasps the power transmission device 11 existing around the power receiving side controller 35. The grasping unit 41 controls the power receiving side communication unit 36 so that the search signal is transmitted by broadcast as a predetermined response request signal. When the search signal is received by the power transmission side communication units 24a and 24b, the power transmission side controllers 23a and 23b determine whether or not the connection is continued. When the power transmission side controllers 23a and 23b are not in the connection continuation state, 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, is transmitted to the power reception side communication unit 36. The power transmission side communication units 24a and 24b are controlled as described above. 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 in the connection continuation state. The connection continuation state will be described later.

  In such a configuration, the grasping unit 41 grasps the power transmission device 11 having the power transmission side communication unit capable of wireless communication 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 the first primary side coils 22a included in the first power transmission device 11a is one. That is, the 1st power transmission apparatus 11a and the 1st primary side coil 22a respond | correspond 1: 1. For this reason, it can be said that the identification information of the 1st power transmission apparatus 11a is the information regarding the 1st primary side 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 receiving side controller 35 replaces one unconnected power transmission device 11 and the power reception device 12 among the plurality of power transmission devices 11. A connection state setting unit 42 that sets a connection state (or communication established state) in which a connection via the power transmission side communication unit and the power reception side communication unit 36 of the power transmission device 11 is established is provided. The unconnected state is a state that is neither a connected state nor a connected state.

  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. And the connection state setting part 42 transmits a connection request signal with respect to the 1st power transmission side communication part 24a of the selected 1st power transmission apparatus 11a using the power receiving side communication part 36. FIG.

  When the first power transmission side controller 23a receives the connection request signal 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 a connected state or an unconnected state. When the first power transmission device 11a is not connected, the first power transmission side controller 23a sets the first power transmission device 11a to a connected state connected to the power reception device 12, and the first power transmission side communication unit. A connection state response signal is transmitted using 24a. The connection state setting unit 42 sets the power reception device 12 to the connection state connected to the first power transmission device 11a when the power reception side communication unit 36 receives the connection state response signal. Thereby, the information regarding received electric power etc. can be exchanged between the 1st power transmission apparatus 11a and the power receiving apparatus 12. FIG.

  In other words, it can be said that the connection state is a state in which information regarding received power can be exchanged. The connection state is a pairing established (authenticated) that the first power transmission device 11a and the power reception device 12 exchange information with each other via the first power transmission side communication unit 24a and the power reception side communication unit 36. It can be said that it is in 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. Thereby, the power receiving side controller 35 can grasp | ascertain whether it is a connection state by confirming the presence or absence of the said flag. Similarly, the 1st power transmission side controller 23a sets the flag which shows that it is a connection state to a predetermined storage area based on having become a connection state.

  On the other hand, when the first power transmission device 11a is already connected, the first power transmission side controller 23a transmits a connection rejection signal for refusing the connection to the power reception side communication unit 36 using the first power transmission side communication unit 24a. To do. Here, when the first power transmission device 11a is in the connected state, it means that the first power transmission device 11a is in a connected state with a power receiving device 12 different from the power receiving device 12 that has transmitted the connection request signal. . That is, the first power transmission device 11a is restricted from being connected to a plurality of power reception devices 12 at the same time.

  The connection state setting unit 42 receives another power transmission device 11 (for example, the second power transmission device 11b) among the plurality of power transmission devices 11 grasped by the grasping unit 41 when the connection rejection signal is received by the power receiving side communication unit 36. ) And a process (connection request) for establishing a connection state. That is, the connection state setting unit 42 sequentially issues a connection request until an unconnected power transmission device 11 is found among the plurality of power transmission devices 11 grasped by the grasping unit 41.

  Note that the connection state setting unit 42 does not enter a connection state even though a connection request is made to all of the plurality of power transmission devices 11 grasped by the grasping unit 41 (connection is rejected). In the case), a connection request is sequentially made to each power transmission device 11 again at predetermined intervals. And the connection state setting part 42 determines with it being an error, when it does not become a connection state, although the connection request with respect to all the power transmission apparatuses 11 was performed in multiple times.

  Incidentally, the connection state setting unit 42 may set and update the state of each power transmission device 11 with respect to the list created by the grasping unit 41. For example, the connection state setting unit 42 first sets each power transmission device 11 in the list as unconnected as an initial state. Then, the connection state setting unit 42 updates the power transmission device 11 for which the connection request has been rejected as pending, and updates the power transmission device 11 that has been set to the connection state and then released from the connection state as transmission determined. Good. The connection state setting unit 42 may make a connection request again to the pending power transmission device 11 depending on the situation, but performs a connection request again to the power transmission device 11 that has been determined to be transmitted. Absent.

  The power receiving side controller 35 is connected between the one power transmission device 11 (for example, the first power transmission device 11a) set to the connection state and the power reception device 12 based on the connection state set by the connection state setting unit 42. A transmission determination unit 43 that determines whether or not power transmission is performed is provided. 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 side communication unit 36 to the first power transmission side communication unit 24a so that identification power is input to the first primary coil 22a of the connected first power transmission device 11a. To transmit a power transmission request signal (instruction signal).

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

Based on the detection result of the detection unit 34, the transmission determination unit 43 determines whether or not AC power is being received in a situation where 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 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 being received” may be considered, for example, when the detection unit 34 detects AC power having a power value equal to or greater than a predetermined threshold. In this case, the threshold value may be, for example, a value obtained by multiplying the power value of the identification power by a predetermined threshold efficiency.

  The above-described series of processing, 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 Processing for determining whether or not AC power is being received is referred to as first power reception determination.

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

  Here, the transmission determination unit 43 performs the first interval period Ti1 from the input end timing of the first identification power to the input start timing of the second identification power for the first power transmission device 11a that is the target power transmission device. It determines based on the specific information 23aa. 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 input end timing of the first identification power. Specifically, the transmission determination unit 43 transmits the second transmission request signal at the timing when the first interval period Ti1 has elapsed from the input end timing of the first identification power.

  The power transmission side controllers 23a and 23b include specific information 23aa and 23bb of the power transmission devices 11a and 11b. The transmission determination unit 43 obtains unique information (unique information 23aa or unique information 23bb) from the connected power transmission device 11 (the first power transmission device 11a or the second power transmission device 11b) at the stage before executing the first power reception determination. Get it. And the transmission determination part 43 determines an interval period (1st interval period Ti1 or 2nd interval period Ti2) using the said specific information.

  The unique information is arbitrary as long as it is different for each power transmission device 11 (power transmission device 11 set in the connection state) as the target power transmission device. For example, the identification information of the power transmission device 11 or the power transmission side communication unit 24a. , 24b may be channel information used for communication with the power receiving side communication unit 36. Communication ID information such as PANID and SSID may also be used.

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

  When it is determined that the AC power is received by the second power reception determination, the transmission determination unit 43 determines whether the one power transmission device 11 (first power transmission device 11a) and the power reception device 12 that are in the connected state this time are connected. It is determined that power transmission is performed between them. On the other hand, when it is determined by the second power reception determination that AC power is not received, the transmission determination unit 43 transmits power between the power transmission device 11 and the power reception device 12 that are in the connected state this time. It is determined not to be performed.

  That is, in the present embodiment, the transmission determination unit 43 determines 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 determined power transmission device 11 and power reception device 12 are determined to be a combination in which power transmission is performed.

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

As shown in FIG. 2, the power receiving side controller 35 includes a continuation determination unit 44 that continues or cancels the connection state based on the determination result of the transmission determination unit 43.
The continuation determination unit 44 continues the connection state when the transmission determination unit 43 determines that power transmission is performed between the one power transmission device 11 (for example, the first power transmission device 11a) and the power reception device 12 in the connection state. To do. Specifically, the continuation determination unit 44 uses the power reception side communication unit 36 to transmit a continuation request signal for requesting continuation of the connection state to the first power transmission side communication unit 24a. When the continuation request signal is received by the first power transmission side communication unit 24a, the first power transmission side controller 23a determines to continue the current connection state and uses the first power transmission side communication unit 24a to continue the response signal. Is transmitted to the power receiving side communication unit 36. The continuation determination unit 44 determines to continue the connection state when the continuation response signal is received by the power receiving side communication unit 36.

  In the following description, a state where the continuation determination unit 44 determines to continue the connection state is referred to as a connection continuation state. In addition, when the continuation determination unit 44 of the first power transmission side controller 23a and the power reception side controller 35 determines to continue the connection state, the flag indicating the connection state is deleted and the connection continuation state is indicated in a predetermined storage area. Set the flag. Thereby, the 1st power transmission side controller 23a and the power receiving side controller 35 can grasp | ascertain whether it is a connection continuation state.

  That is, the power transmission device 11 and the power receiving device 12 can be in three states: a connection state, a connection continuation state, or an unconnected state that is neither a connection state nor a connection continuation state. And the power transmission side controllers 23a and 23b and the power receiving side controller 35 are comprised so that grasping | ascertaining which of the said three states (an unconnected state, a connection state, a connection continuation state) is possible.

  On the other hand, when the transmission determination unit 43 determines that power transmission is not performed between the first power transmission device 11a and the power reception device 12, the continuation determination unit 44 releases the connection state and performs the first power transmission device 11a. And the power receiving apparatus 12 is set to an unconnected state. Specifically, the continuation determination unit 44 cancels the connection with the first power transmission device 11a and deletes the flag indicating the connection state. And the continuation determination part 44 transmits the cancellation | release request signal which requests | requires cancellation | release of a connection state to the 1st power transmission side communication part 24a using the power receiving side communication part 36. FIG. When the release request signal is received by the first power transmission side communication unit 24a, the first power transmission side controller 23a cancels the connection state with the power receiving device 12 and erases the flag indicating the connection state.

  When the non-contact power transmission system 10 determines that the connection state is continued by the continuation determination unit 44, 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. And the power receiving device 12 are configured to perform power transmission.

  Specifically, the power receiving side controller 35 uses the power receiving side communication unit 36 to transmit, 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 AC power. To do. The first power transmission side controller 23a receives the charging request signal from the first power transmission side communication unit 24a, and the first power supply unit 21a is configured to input the charging power to the first primary coil 22a. To control. Thereby, the electric power for charging is transmitted from the first power transmission device 11a toward the power receiving device 12, and the vehicle battery 33 is charged.

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

  In addition, the power receiving side controller 35 determines whether or not the termination condition is satisfied, and when the termination condition is satisfied, the power reception side communication unit 36 is used to request a charge termination request signal for requesting termination of charging. Is transmitted to the first power transmission side communication unit 24a. The first power transmission side controller 23a controls the first power supply unit 21a so that the output of the charging power is stopped when the charging end request signal is received by the first power transmission side communication unit 24a.

  Here, the termination condition may be, for example, a case where the state of charge (SOC) of the vehicle battery 33 becomes a fully charged state (charging termination trigger state), or a case where some trouble occurs in power transmission.

  Further, the end condition is not limited to this. For example, in a configuration in which the end switch is provided in each of the power transmission apparatuses 11a and 11b, a case where the end switch is operated as the end condition may be employed. In this case, the power transmission side controllers 23a and 23b may determine whether or not the end switch has been operated. In other words, the end condition is arbitrary, and the execution subject for determining whether or not the end condition is satisfied may be the power receiving side controller 35 or the power transmission side controllers 23a and 23b.

  When the connection state is canceled by the continuation determination unit 44, the non-contact power transmission system 10 is one power transmission device 11 (the connection state is released among the plurality of power transmission devices 11 recognized by the grasping unit 41 ( 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) whose transmission has been determined are a combination in which power transmission is performed.

  Specifically, when the connection state is canceled by the continuation determination unit 44, the connection state setting unit 42 is in an unconnected state different from the power transmission device 11 (for example, the first power transmission device 11a) whose connection state has been canceled. The power transmission device 11 (for example, the second power transmission device 11b) and the power reception device 12 are set to a connected state. And the transmission determination part 43 determines whether electric power transmission is performed between the 2nd power transmission apparatus 11b and the power receiving apparatus 12 of the newly set connection state (1st power reception determination and 2nd power reception determination). I do. Whether or not the continuation determination unit 44 continues the connection state between the second power transmission device 11b and the power reception device 12 based on the determination result of the transmission determination unit 43 targeting the second power transmission device 11b and the power reception device 12. Determine. Since these specific configurations are the same as when the first power transmitting device 11a and the power receiving device 12 are in the connected state, detailed description thereof is omitted.

  Incidentally, the connection state setting unit 42 is configured to set a new connection state (connection request) based on the release of the connection state by the continuation determination unit 44. That is, the power receiving device 12 is restricted from being connected to a plurality of power transmitting devices 11 at the same time.

  Here, as already described, 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 continued, but is not transmitted when the connection is continued. For this reason, the grasping unit 41 includes a power transmission side communication unit that can wirelessly communicate with the power reception side communication unit 36 among the plurality of power transmission devices 11 and that other than the connection continuation state (unconnected state or connection Grasp what is the state). Note that the power transmission side communication unit capable of wireless communication with the power reception side communication unit 36 exists within a specific distance that is predetermined for the power reception side communication unit 36 (a distance at which the power reception side communication unit 36 can communicate). It can be said that it is a thing.

  When there is one power transmission device 11 grasped by the grasping unit 41, the connection state setting unit 42 sets the grasped power transmission device 11 and the power receiving device 12 in the connection state. And the transmission determination part 43 determines whether electric power transmission is performed between the power transmission apparatus 11 and the power receiving apparatus 12 which became the said connection state. And the continuation determination part 44 continues a connection state, when the determination result of the transmission determination part 43 is affirmation determination (when alternating current power is received by the secondary side coil 31 in 2nd power reception determination), A power transmission process using the charging power is executed.

  Next, the effect | action of this embodiment is demonstrated using FIGS. In FIGS. 3 and 6 to 8, modes of power values input to the primary side coils 22 a and 22 b and the secondary side coils 31 a and 31 b are shown, and communication modes are indicated by arrows. In this case, for convenience of illustration, some of the arrows are shown as being shifted appropriately even at the same timing. For example, in FIG. 3 and the like, the timing at which the power transmission request signal is transmitted is different from the timing at which the identification power is input, but is actually substantially the same.

  Further, in FIGS. 3 and 6 to 8, the states of the power transmission devices 11 a and 11 b and the power reception devices 12 a and 12 b (unconnected state, connection state, connection continuation state) are also shown. Specifically, the period in the connected state is indicated by a two-dot chain line arrow, and the period in the connection continued state is indicated by a one-dot chain line arrow. Note that a period in which the one-dot chain line arrow and the two-dot chain line arrow are not described is an unconnected state.

  First, as a first case (case), a case is assumed in which the first vehicle C1 is disposed in the first parking space S1, as shown in FIG. In this case, it is assumed that the power transmission devices 11a and 11b are in an unconnected state at the timing when the first vehicle C1 is arranged in the first parking space S1. The second vehicle C2 in which the power receiving device 12 (hereinafter referred to as the second power receiving device 12b) is mounted during power transmission to the power receiving device 12 (hereinafter referred to as the first power receiving device 12a) mounted in the first vehicle C1. It is assumed that it is arranged in the second parking space S2.

  For convenience of explanation, in the following explanation, the secondary coil 31, the power receiving controller 35, and the power receiving communication unit 36 of the first power receiving device 12a are referred to as the first secondary coil 31a and the first power receiving controller. 35a and the first power receiving side communication unit 36a. The secondary coil 31, the power receiving controller 35, and the power receiving communication unit 36 of the second power receiving device 12b are referred to as a second secondary coil 31b, a second power receiving controller 35b, and a second power receiving communication unit 36b. .

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

  Thereafter, as shown in FIGS. 3A and 3C, at the timing t2, the connection state setting unit 42 of the first power receiving device 12a sets the second power transmitting device 11b among the power transmitting devices 11a and 11b. Select and make a connection request to the second power transmission device 11b. In this case, the second power transmission device 11b is not connected (is not connected), and therefore 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 the timing of t3, a power transmission request signal is transmitted from the first power receiving side communication unit 36a toward the second power transmission side communication unit 24b. Thereby, the identification power is input to the second primary coil 22b over 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). Is called.

  Here, in the first case, since the first vehicle C1 is parked in the first parking space S1, even if the identification power is input to the second primary coil 22b, AC power is not received by the secondary side coil 31a of 1 or small enough to be ignored. For this reason, the determination result of the first power reception determination is a negative determination indicating that 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 transmitting device 11b is released.

  When the connection state between the first power reception device 12a and the second power transmission device 11b is released, the first power reception device 12a is in a connection state with another unconnected power transmission device 11 (first power transmission device 11a). 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 transmitting device 11a at the timing t5. The first power receiving device 12a and the first power transmitting device 11a are connected.

  Then, at the timing of t6, a power transmission request signal is transmitted from the first power receiving side communication unit 36a toward the first power transmission side communication unit 24a. As a result, identification power is input to the first primary coil 22a over the first period T1. And the 1st power reception determination is performed by the transmission determination part 43 of the 1st power receiving apparatus 12a.

  Here, as shown in FIGS. 3A and 3B, when the identification power is input to the first primary coil 22a, the identification power is detected by the first secondary coil 31a. AC power corresponding to is received. Thereby, the determination result of the 1st power reception determination of the transmission determination part 43 of the 1st power receiving apparatus 12a becomes affirmation determination which shows that alternating current power is received by the 1st secondary side coil 31a.

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

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

  Based on the determination result of the second power reception determination being affirmative, 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, the process related to the setting of the connection continuation state is performed at the timing t8, and the first power receiving device 12a and the first power transmission device 11a are in the connection continuation state.

  After entering the connection continuation state, full-scale power transmission is performed until the termination condition is satisfied. Specifically, charging power is input to the first primary coil 22a at timing t9 (charging power is output from the first power supply unit 21a). Then, the first secondary coil 31 a receives AC power corresponding to the charging power, and the AC power is used for charging the vehicle battery 33.

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

  Here, the 1st power transmission apparatus 11a is a connection continuation state. For this reason, a search response signal is not transmitted from the 1st power transmission side communication part 24a. On the other hand, since the second power transmission device 11b is in an unconnected state, a search response signal is transmitted from the second power transmission side communication unit 24b.

  That is, the connection continuation state is excluded from the power transmission device 11 grasped by the grasping unit 41. On the other hand, among the plurality of power transmission devices 11, the grasping unit 41 grasps an unconnected state or a connected state. Thereafter, the connection state is set.

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

Next, a 2nd case is demonstrated using FIG.5 and FIG.6.
As shown in FIG. 5, in the second case, two vehicles C1, C2 enter the parking spaces S1, S2 almost simultaneously, the first vehicle C1 is arranged in the first parking space S1, and the second parking space. Assume that the second vehicle C2 is arranged in S2. It is assumed that the power transmission devices 11a and 11b are not connected before the vehicles C1 and C2 enter.

  In this 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 11b (second primary coil 22b) and the second power receiving device 12b (second secondary coil 31b).

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

  Thereafter, as shown in FIGS. 6A and 6D, the first power receiving device 12a and the second power transmitting device 11b are connected at the timing of t23. And a power transmission request signal is transmitted toward the 2nd power transmission side communication part 24b from the 1st power reception side communication part 36a at the timing of t24. As a result, identification power is input to the second primary coil 22b.

  Here, as illustrated in FIGS. 6B and 6D, the connection state setting unit 42 of the second power receiving device 12b makes a connection request to the second power transmitting device 11b at the timing of t25. In this case, since the second power transmission device 11b is already connected to the first power reception device 12a, the second power transmission device 11b rejects the connection request from the connection state setting unit 42 of the second power reception device 12b. For this reason, the 2nd power receiving apparatus 12b and the 2nd power transmission apparatus 11b are not in a connection state.

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

  As shown in FIGS. 6A and 6D, when identification power is input to the second primary coil 22b, AC power is received by the first secondary coil 31a. Not. For this reason, the determination result of the 1st power reception determination by the transmission determination part 43 of the 1st power receiving apparatus 12a becomes negative determination. In this case, the connection state between the first power receiving device 12a and the second power transmitting device 11b is released at the timing of t27.

  Thereafter, as illustrated 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 transmitting device 11a at the timing t28. In this case, the first power transmission device 11a is already connected to the second power reception device 12b, and therefore rejects the connection request.

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

  Thereafter, as shown in FIGS. 6A and 6C, the connection state setting unit 42 of the first power receiving device 12a is at a timing t31 that is a predetermined period away from the timing 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 not connected, 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 FIGS. 6B and 6D, the second power receiving device 12b and the second power transmitting device 11b are connected at the timing of t32. Then, as shown in FIG. 6A and FIG. 6C, the power transmission request signal is transmitted from the first power receiving side communication unit 36a to the first power transmission side communication unit 24a at the timing of t33, The identification power is input to the primary coil 22a. In this case, as shown to Fig.6 (a), the alternating current power corresponding to the electric power for identification is received by the 1st secondary side coil 31a. For this reason, the determination result of the first power reception determination is an affirmative determination, and the second power reception determination is performed. Then, when the determination result of the second power reception determination is affirmative, the connection state is continued.

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

  As described above, when the second power transmission device 11b is connected to the first power reception device 12a and a connection request is made from the second power reception device 12b, the connection from the second power reception device 12b is performed. Reject the request. That is, the second power transmission device 11b is restricted from being connected to the second power reception device 12b when the second power transmission device 11b is connected to the first power reception device 12a. Then, the rejected second power receiving device 12b is connected to the unconnected first power transmitting device 11a.

  Thereafter, when it is determined that the combination is not in which power transmission is performed (when the determination result of the first power reception determination is a negative determination), the connection state is released. The first power receiving device 12a is connected to the first power transmitting device 11a different from the second power transmitting device 11b, and the second power receiving device 12b is connected to the second power transmitting device 11b different from the first power transmitting device 11a. Connected. And the determination of the transmission determination part 43 etc. are performed. As a result, a series of processes from setting the connection state to continuation determination by the continuation determination unit 44 is executed while changing the target power transmission device that is in the connection state until the combination in which power transmission is performed is grasped.

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

  As illustrated 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.

  Thereafter, as shown in FIGS. 7A and 7D, the first power receiving device 12a and the second power transmitting device 11b are connected at the timing of t43. Moreover, as shown in FIG.7 (b) and FIG.7 (c), the 2nd power receiving apparatus 12b and the 1st power transmission apparatus 11a will be in a connection state at the timing of t44.

  And at the timing of t45, the power transmission request signal which goes to the 2nd power transmission side communication part 24b from the 1st power receiving side communication part 36a, and the power transmission request signal which goes to the 1st power transmission side communication part 24a from the 2nd power receiving side communication part 36b Are sent at the same time. In this case, identification power is simultaneously input to the primary coils 22a and 22b.

  In this case, each secondary coil 31a, 31b receives AC power corresponding to the power for identification at the same time. Then, since the first power receiving device 12a misidentifies that AC power is received from the second power transmitting device 11b connected to the first power receiving device 12a, the determination result of the first power receiving determination is an affirmative determination. Become. Similarly, the determination result of the first power reception determination in the second power receiving device 12b is affirmative.

  Thereafter, the second power reception determination is performed in each of the power receiving apparatuses 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 power transmission request signal is different.

  Specifically, as shown in FIG. 7B and FIG. 7C, the second time at the timing of t47 when the first interval period Ti1 has elapsed from the timing of t46 when the input of the first identification power is completed. A power transmission request signal is transmitted from the power reception side communication unit 36b toward the first power transmission side communication unit 24a, and the second identification power is input to the first primary 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. For this reason, the connection state of the 2nd power receiving apparatus 12b and the 1st power transmission apparatus 11a is cancelled | released at the timing of t48.

  Thereafter, as shown in FIGS. 7A and 7D, at the timing of t49 when the second interval period Ti2 has elapsed from the timing of t46, the first power receiving side communication unit 36a to the second power transmission side communication unit. The second power transmission request signal is transmitted toward 24b, and the second identification power is input to the second primary coil 22b. In this case, since AC power is not received by the first secondary coil 31a, the determination result of the second power reception determination is negative. For this reason, the connection state of the 1st power receiving apparatus 12a and the 2nd power transmission apparatus 11b is cancelled | released at the timing of t50.

  Here, since the difference between the interval periods Ti1 and Ti2 is longer than the second period T2, even if the input start timing (input end timing) of the first identification power is the same, the second time The input time for the identification power is shifted. That is, the identification power to the second primary coil 22b is started after the input of the identification power to the first primary coil 22a is completed. As a result, the second time that may occur due to a part of the time that the identification power is input to the first primary coil 22a and the time that the identification power is input to the second primary coil 22b. Misrecognition of power reception determination can be suppressed.

  Next, the 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 soon 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 apparatus 12b is executed at the timing of t61, and the grasping process by the grasping part 41 of the first power receiving apparatus 12a is executed at the timing of t62.

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

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

  Then, at the timing when the first interval period Ti1 has elapsed from the timing of t68 and at the timing of t69, which is the timing when the second interval period Ti2 has elapsed from the timing of t65, the power-receiving-side communication units 36a and 36b A power transmission request signal for the second time is transmitted. As a result, the second identification power is simultaneously input to the primary coils 22a and 22b, and the AC power corresponding to the identification power is received by the secondary coils 31a and 31b. In this case, the connection state is continued as it is, and the power transmission process using the charging power is performed. That is, even when the second identification power is input to the primary coils 22a and 22b at the same timing, misidentification or the like hardly occurs.

According to the embodiment described in detail above, the following excellent effects are obtained.
(1) The power receiving side controller 35 of the power receiving device 12 includes a grasping unit 41 that grasps the plurality of power transmitting devices 11. When the grasping unit 41 grasps the plurality of power transmission devices 11, the non-contact power transmission system 10 includes the target power transmission device (for example, the first power transmission device) among the plurality of power transmission devices 11 grasped by the grasping unit 41. 11a) and the power receiving apparatus 12 includes a transmission determination unit 43 that determines whether or not power transmission is performed. The transmission determination unit 43 controls the target power transmission device so that the identification power is input over the first period T1 to the primary coil (for example, the first primary coil 22a) of the target power transmission device. Then, a first power reception determination is performed to determine whether or not AC power is received by the secondary coil 31 when the identification power is input to the primary coil. And the transmission determination part 43 inputs the electric power for identification over the 2nd period T2 again with respect to the primary side coil of an object power transmission apparatus, when the determination result of 1st power reception determination is affirmation determination. The second power reception determination is performed to control the target power transmission device so as to determine whether or not AC power is received by the secondary coil 31. Then, when the determination result of the second power reception determination is an affirmative determination, it is determined that power transmission is performed between the target power transmission device and the power reception device 12. Thereby, the combination in which electric power transmission is performed can be grasped suitably. In particular, according to this configuration, even if the determination result of the first power reception determination is erroneously affirmative due to erroneous detection of the detection unit 34, the determination result of the second power reception determination can be a negative determination. Therefore, the determination accuracy of the transmission determination unit 43 can be improved.

  (2) The interval periods Ti1 and Ti2 from the input end timing of the first identification power to the input start timing of the second identification power are different for each of the plurality of power transmission devices 11a and 11b. As a result, as shown in the third case, the determination result of the first power reception determination is caused by the first identification power being simultaneously input to the two primary coils 22a and 22b. Even if the determination is erroneously affirmative, the determination result of the second power reception determination can be negative because the input start timing of the second identification power is different. Therefore, the determination accuracy of the transmission determination unit 43 can be improved.

  (3) Particularly, 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 power different, the interval periods Ti1 and Ti2 are made different from each other in the first period T1. It was adopted. Thereby, in order to make 1st period T1 different, it can suppress that 1st period T1 becomes long. Therefore, it is possible to suppress an increase in time required for the first power reception determination and an increase in useless power consumption.

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

  (5) 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. Thus, even if the input end timing of the first identification power to the primary coils 22a and 22b is the same, the second identification power is input to the primary coils 22a and 22b. The time is not overlapped. Therefore, it is possible to suppress erroneous determination of the second power reception determination due to the overlap of the time when the second identification power is input to the primary coils 22a and 22b.

  Moreover, if it is the said structure, it is not necessary to consider the timing which received electric power was detected as 2nd electric power reception determination, What is necessary is just to determine whether it detected simply. Therefore, the second power reception determination can be easily performed.

  (6) The non-contact power transmission system 10 includes a non-connected power transmission device 11 (for example, the first power transmission device 11a) and a non-connected power reception device 12 as target power transmission devices. Side connection unit 24a) and a connection state setting unit 42 for setting the connection state established through the power reception side communication unit 36. The transmission determination unit 43 determines whether or not power transmission is performed between the power transmission device 11 and the power reception device 12 in the connection state based on the connection state being set. When the determination result by the transmission determination unit 43 is affirmative (when power transmission is performed), the non-contact power transmission system 10 continues the connection state, while the determination result of the transmission determination unit 43 is negative. If it is (when power transmission is not performed), a continuation determination unit 44 for releasing the connection state is provided.

  According to this configuration, after the power transmission device 11 and the power reception device 12 of the plurality of power transmission devices 11 are connected, the determination by the transmission determination unit 43 is performed. And when it determines with electric power transmission being performed by the transmission determination part 43, a connection state is continued. As a result, power can be transmitted between the power transmission device 11 and the power reception device 12 that are in the connection continuation state while exchanging information as they are.

  The connection state setting unit 42 sets the connection state to the power transmission device 11 in the unconnected state and the power reception device 12 in the unconnected state. Thus, the power transmission device 11 and the power receiving device 12 that are in the connected state are restricted from being connected to other devices until the connection state is released. Therefore, for example, it is possible to suppress a situation in which the combination in which power transmission is performed cannot be grasped due to the power receiving device 12 being connected to the plurality of power transmitting devices 11 at the same time.

  In particular, if the power receiving device 12 is overlapped with the plurality of power transmission devices 11 and is connected to the plurality of power transmission devices 11 from one power receiving device 12 at the same time, a plurality of primary side coils are transmitted. In contrast, AC power is input at the same time. In this case, the input pattern (for example, input time etc.) of AC power input to each primary coil is varied in order to grasp which primary coil is receiving power from among the plurality of primary coils. Need arises. Then, there is a concern about complicated control. On the other hand, in the present embodiment, since it is only necessary to determine whether or not power transmission is performed between the one power transmission device 11 and the power reception device 12 that are already connected, control is facilitated. Can be planned.

  (7) The grasping unit 41 includes 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 Other than that (that is, the power transmission device 11 in an unconnected state or a connected state) is grasped. Thereby, since the power transmission device 11 in the connection continuation state is excluded from the grasping targets of the grasping unit 41, the number of grasped power transmission devices 11 can be reduced. Therefore, it is possible to reduce the number of determinations by the connection state setting and transmission determination unit 43, and it is possible to shorten the time required to grasp the combination in which power transmission is performed.

  Note that the power transmission device 11 in the connection continuation state has already been determined to be a combination in which power transmission is performed with another power reception device 12 based on the determination by the transmission determination unit 43, and thus the current power reception device 12 and power transmission this time. Cannot be combined. Therefore, even if it excludes from a grasp object, there is no trouble.

  On the other hand, the connected power transmission device 11 can be released depending on the determination result of the transmission determination unit 43. And the power transmission apparatus 11 of the said connection state can be a combination with this power receiving apparatus 12 and electric power transmission. Therefore, the combination in which electric power transmission is performed can be suitably grasped | ascertained by also including the power transmission apparatus 11 of the above connection states in the grasp object.

  (8) 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 serving as the power transmission side control units search when the search signals are received by the power transmission side communication units 24a and 24b in a state that is not in the connection continuation state (a state in which they are not connected or in a connected state). The power transmission side communication units 24 a and 24 b are controlled so as to transmit the response signal to the power reception side communication unit 36. On the other hand, when the search signal is received by the power transmission side communication units 24a and 24b in the state where the power transmission side controllers 23a and 23b are in the connection continuation state, the power transmission side communication units 24a and 24b are not transmitted. To control. Thereby, the power transmission apparatus 11 in the connection continuation state is excluded from the objects grasped by the grasping unit 41. Therefore, the effect (7) can be obtained relatively easily.

  (9) When the connection state is released by the continuation determination unit 44, the connection state setting unit 42 is in an unconnected state different from the power transmission device 11 (for example, the first power transmission device 11a) from which the connection state is released. The power transmission device 11 (for example, the second power transmission device 11b) and the unconnected power receiving device 12 are set to the connected state. Then, the determination by the transmission determination unit 43 and the determination by the continuation determination unit 44 for the power transmission device 11 and the power reception device 12 newly set in the connection state are performed. Thereby, since the determination by the transmission determination unit 43 and the continuation determination unit 44 is sequentially performed until the combination in which power transmission is performed is determined, the combination in which power transmission is performed can be appropriately determined.

  (10) When the continuation determination unit 44 determines that the connection state is to be continued, the non-contact power transmission system 10 performs the primary of the power transmission device 11 in the connection continuation state until a predetermined termination condition is satisfied. The power transmission power (charging power) having a power value larger than the identification power is input to the side coil (for example, the first primary coil 22a). Thereby, although it is not the combination in which electric power transmission is performed, it is avoided that the electric power for charging is input into a primary side coil. Therefore, useless power loss can be avoided.

  (11) The connection state setting unit 42 sequentially issues connection requests to the plurality of power transmission devices 11 grasped by the grasping unit 41 until an unconnected power transmission device 11 is found (until a 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 determination by the transmission determination unit 43 or the like can be performed. Thereby, the combination by which electric power transmission is performed can be grasped | ascertained early.

In addition, you may change the said embodiment as follows.
The power transmission side controllers 23a and 23b are configured to control the power transmission side communication units 24a and 24b so that a beacon is periodically transmitted in a state where the connection is not continued and a beacon is not periodically transmitted in a state where the connection is continued. It may be. In this case, the grasping unit 41 of the power receiving side controller 35 may be configured to grasp the power transmission device 11 based on the reception of the beacon by the power receiving side communication unit 36. Thereby, the power transmission apparatus 11 can be grasped | ascertained, without transmitting a search signal.

  The connection state setting unit 42 may be configured to make a connection request preferentially from the one having a high reception strength of the search response signal when there are a plurality of unconnected power transmission apparatuses 11. As a result, connection requests can be made in order from the power transmitting device 11 that is present nearby to the power receiving device 12.

  ○ When the power transmission device 11 makes a connection request from a power receiving device 12 different from the power receiving device 12 related to the connection continuation state after transitioning from the connection state to the connection continuation state, the power transmission device 11 rejects the connection and the connection continuation state You may notify that it became. In this case, when the other power receiving apparatus 12 receives the notification, the power transmitting apparatus 11 that has performed the notification may be excluded from the targets for which the connection request is made. Thereby, useless connection requests can be avoided.

  The power transmission side controllers 23a and 23b may include a connection state setting unit 42, a transmission determination unit 43, and a continuation determination unit 44. In this case, the power receiving side controller 35 may transmit information necessary for various determinations (for example, detection results of the detecting unit 34) to the power transmitting side controllers 23a and 23b using the power receiving side communication unit 36. Note that the power transmission side controllers 23a and 23b and the power reception side controller 35 are connected by setting the connection state and making various determinations by exchanging various request signals and various response signals in response to the various request signals. In cooperation, it can be said that a connection state setting unit 42, a transmission determination unit 43, and a continuation determination unit 44 are provided.

  The power value of the first identification power (first identification power) and the second identification power (second identification power) may be the same or different. Good. In addition, the power value of the identification power is smaller than the power value of the charging power, but is not limited thereto, and may be the same.

The first period T1 and the second period T2 may be the same 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 input start timing of the second identification power is different. Therefore, it is preferable to determine whether or not the combination is correct by comparing the input start timing of the identification power for the second time with the detection start timing of the received power.

  O Instead of (or in addition to) the specific information 23aa and 23bb of the power transmission devices 11a and 11b, the interval periods Ti1 and Ti2 may be determined based on the specific information of the power reception devices 12a and 12b.

  The detection unit 34 detects the AC power received by the secondary coil 31, but is not limited thereto, and may be configured to detect DC power converted from the AC power.

  In the embodiment, the first identification power is stopped when it is input over the first period T1, but the present invention is not limited to this, and a stop request signal is received from the power receiving side communication unit 36. Until then, the input of the power for identification may be continued. In this case, the power receiving side controller 35 may control the power receiving side communication unit 36 so that the stop request signal is transmitted when the AC power is not received for a predetermined period after the transmission request signal is transmitted.

  ○ Instead of the configuration in which the interval periods Ti1 and Ti2 are made different, the interval period is the same regardless of each power transmission device 11, and the first period T1 is different for each of the plurality of power transmission devices 11. Good. Even in this case, even if the first identification power input start timing is the same, the second identification power input start timing is different, so that erroneous determination of the transmission determination unit 43 can be suppressed. In short, 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 addition, in the structure which makes the said 1st period T1 differ, it is good to determine the said 1st period T1 based on specific information 23aa and 23bb. In addition, 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 resonance frequency of the resonance circuit including the first primary coil 22a (or the resonance circuit including the second primary coil 22b) and the resonance frequency of the resonance circuit including the secondary coil 31 are defined as power transmission. May be different within the possible range.

○ 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 22 a and 22 b and the secondary side coil 31.
The AC power received by the secondary coil 31 may be used for purposes other than charging the vehicle battery 33.

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

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

  The grasping unit 41 is configured to grasp the unconnected or connected power transmission device 11, but is not limited thereto, and may be configured to grasp only the unconnected power transmission device 11. Specifically, the power transmission side controllers 23a and 23b transmit a search response signal to the power receiving side communication unit 36 when the search signal is received by the power transmission side communication units 24a and 24b in the unconnected state. The power transmission side communication units 24a and 24b are controlled. On the other hand, when the search signal is received by the power transmission side communication units 24a and 24b 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, 24b. Thereby, only the unconnected power transmission device 11 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 receiving side communication unit 36 among the plurality of power transmission devices 11 grasped by the grasping unit 41, and at least excludes the connection continuation state. It is good to know what is not connected. In other words, it is sufficient that at least the connection continuation state is excluded from the grasping targets of the grasping unit 41. In addition, the power transmission side controllers 23a and 23b receive power from the power transmission side communication units 24a and 24b when a search signal is received by the power transmission side communication units 24a and 24b in a state of at least an unconnected state excluding the connection continuation state. What is necessary is just to control the power transmission side communication parts 24a and 24b so that a search response signal may be transmitted to the power receiving side communication part 36.

A configuration in which the power transmission device 11 includes a plurality of primary coils may be used. In this case, the power transmission apparatus 11 should just be the structure which controls separately the alternating current power input into each primary side coil.
In the embodiment, the connection state is set by the connection state setting unit 42 before the determination by the transmission determination unit 43 is performed. However, the present invention is not limited to this, and the determination result of the transmission determination unit 43 is a positive determination. Based on this, a configuration in which the connection state is set may be used. In this case, the continuation determination unit 44 may be omitted. Further, both the connection state setting unit 42 and the continuation determination unit 44 may be omitted. That is, the connection state setting is not essential.

  DESCRIPTION OF SYMBOLS 10 ... Non-contact electric power transmission system, 11 ... Power transmission apparatus, 11a ... 1st power transmission apparatus, 11b ... 2nd power transmission apparatus, 12 ... Power reception apparatus, 12a ... 1st power reception apparatus, 12b ... 2nd power reception apparatus, 22a, 22b ... Primary coil, 23a, 23b ... power transmission side controller, 24a, 24b ... power transmission side communication unit, 31 (31a, 31b) ... secondary coil, 35 (35a, 35b) ... power reception side controller, 36 (36a, 36b) ) ... receiving side communication unit, 41 ... grasping unit, 42 ... connection state setting unit, 43 ... transmission judgment unit, 44 ... continuation judgment unit, Ti1, Ti2 ... interval period.

Claims (6)

A plurality of power transmission devices having primary coils to which AC power is input;
A power receiving device having a secondary coil capable of receiving the AC power input to the primary coil in a contactless manner;
In a non-contact power transmission system with
The power receiving device includes a grasping unit for grasping the power transmitting device,
When a plurality of power transmission devices are grasped by the grasping unit, the contactless power transmission system is configured to generate power between the target power transmission device and the power receiving device among the plurality of power transmission devices grasped by the grasping unit. A transmission determination unit for determining whether or not transmission is performed;
The transmission determination unit
The target power transmission apparatus is controlled so that the first identification power is input as the AC power over the first period to the primary coil of the target power transmission apparatus, and the first identification power is A first power reception determination for determining whether AC power is received by the secondary coil when being input to the primary coil;
When it is determined by the first power reception determination that AC power is being received, the second identification power is again supplied as the AC power to the primary coil of the target power transmission apparatus in the second period. Whether or not AC power is received by the secondary coil when the second identification power is input to the primary coil. A second power reception determination to determine;
Is what
When it is determined by the second power reception determination that AC power is received by the secondary coil, it is determined that the power transmission is performed, while the second power reception determination is performed by the secondary coil. When it is determined that AC power is not received, it is determined that the power transmission is not performed,
The non-contact power transmission system, wherein a period from an input start timing of the first identification power to an input start timing of the second identification power is different for each of the plurality of power transmission devices. The first period is the same in the plurality of power transmission devices,
2. The contactless power transmission system according to claim 1, wherein an interval period from an input end timing of the first identification power to an input start timing of the second identification power is different for each of the plurality of power transmission devices.   The contactless power transmission system according to claim 2, wherein the interval period is determined based on unique information of the power transmission device. The plurality of power transmission devices include a first power transmission device and a second power transmission device,
The non-contact power transmission system according to claim 2 or 3, wherein a difference between a first interval period of the first power transmission device and a second interval period of the second power transmission device is longer than the second period. Each of the plurality of power transmission devices includes a power transmission side communication unit that performs wireless communication,
The power receiving device includes a power receiving side communication unit that performs wireless communication,
The non-contact power transmission system includes a connection state setting unit that sets the target power transmission device and the power reception device to a connection state in which connection via the power transmission side communication unit and the power reception side communication unit is established,
The target power transmission device set in the connection state is restricted from being in the connection state with another power reception device until the connection state is released,
The transmission determination unit determines whether or not power transmission is performed between the target power transmission device set to the connection state and the power reception device based on the setting by the connection state setting unit. The contactless power transmission system according to any one of claims 1 to 4, wherein the system is to be determined. In a power receiving device capable of receiving AC power in a contactless manner from a power transmission device having a primary side coil to which AC power is input and a power transmission side communication unit that performs wireless communication,
A secondary coil capable of receiving the AC power input to the primary coil;
A grasping unit for grasping the power transmission device;
When a plurality of power transmission devices are grasped by the grasping unit, it is determined whether or not power transmission is performed between the target power transmission device and the power receiving device among the plurality of power transmission devices grasped by the grasping unit. A transmission determination unit for determining;
With
The transmission determination unit
The target power transmission apparatus is instructed to input a first identification power to the primary coil of the target power transmission apparatus over a first period, and the first identification power is the primary side A first power reception determination for determining whether AC power is received by the secondary coil when being input to the coil;
When it is determined by the first power reception determination that AC power is being received by the secondary coil, the second identification power is again supplied to the primary coil of the target power transmission apparatus for a second period. Whether or not AC power is received by the secondary coil when the second identification power is input to the primary coil. A second power reception determination for determining whether or not
Is what
When it is determined by the second power reception determination that AC power is received by the secondary coil, it is determined that the power transmission is performed, while the second power reception determination is performed by the secondary coil. When it is determined that AC power is not received, it is determined that the power transmission is not performed,
The power receiving device, wherein a period from an input start timing of the first identification power to an input start timing of the second identification power is different for each of the plurality of power transmission devices.