JP2015095939A - Power transmission system and transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmission system in which the usage of each transmission section can be grasped suitably, and to provide a transmission device.SOLUTION: A power transmission system 10 includes a first transmission device 11a having a first primary coil 22a to which AC power is inputted, and a second transmission device 11b having a second primary coil 22b to which AC power is inputted. Furthermore, the power transmission system 10 includes a secondary coil 31 capable of receiving AC power in noncontact from any one of the primary coils 22a, 22b, and a power receiving device 12 having a measurement section 34 for measuring the AC power received by the secondary coil 31.

Description

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

  DESCRIPTION OF RELATED ART Conventionally, the power transmission system provided with the power transmission apparatus which has a power transmission part, and the power receiving apparatus which has a power receiving part is known. For example, a power transmission system described in Patent Literature 1 includes a power transmission device having a power transmission cable provided with a power transmission connector as a power transmission unit, and a power reception device having a power reception connector connectable to the power transmission connector as a power reception unit. . In this power transmission system, power transmission is performed from the power transmission device to the power reception device by connecting the power transmission connector and the power reception connector as a possible transmission condition.

  For example, the power transmission system described in Patent Document 2 includes a power transmission device having a primary coil as a power transmission unit and a power reception device having a secondary coil as a power reception unit. In this power transmission system, power transmission is performed from the power transmission device to the power reception device by causing magnetic resonance between the primary side coil and the secondary side coil as a possible transmission condition.

JP 2012-105474 A JP 2009-106136 A

  Here, when the power transmission device includes a plurality of power transmission units, or when a plurality of power transmission devices including one power transmission unit are provided, a plurality of power transmission units exist. In this case, for example, when it is specified which power transmission unit among the plurality of power transmission units satisfies the transmittable condition with the power reception unit, it may be desired to grasp the usage status of each power transmission unit.

  The objective of this invention is made | formed in view of the situation mentioned above, and is providing the electric power transmission system and power transmission apparatus which can grasp | ascertain the usage condition of each power transmission part suitably.

  A power transmission system that achieves the above object includes at least one power transmission device having one or a plurality of power transmission units, and includes a power reception device having a power reception unit capable of receiving power from the power transmission unit, The power reception unit is capable of power transmission when a predetermined transmission enable condition is established, and the power transmission system includes the plurality of power transmission units when there are a plurality of power transmission units. Among the power transmission units, a specific unit that identifies a target power transmission unit that satisfies the transmittable condition, a use state setting unit that sets the target power transmission unit to a use state, and the target power transmission unit until a predetermined termination condition is satisfied And a power transmission processing execution unit that executes power transmission processing for performing power transmission between the power reception units, and a usage state maintaining unit that maintains the usage state even after the termination condition is satisfied. The And butterflies.

  According to such a configuration, when there are a plurality of power transmission units, the target power transmission unit that satisfies the transmittable condition is specified, and power transmission is performed between the target power transmission unit and the power reception unit until the end condition is satisfied. In such a configuration, the target power transmission unit remains in use even after the termination condition is satisfied. Thereby, even after the termination condition is satisfied, it is possible to grasp that the target power transmission unit is in use. Therefore, it is possible to appropriately grasp the usage status of each power transmission unit.

  In the power transmission system, the power transmission device includes a primary coil as the power transmission unit, the power reception device includes a secondary coil as the power reception unit, and AC power is input to the power transmission unit. The power receiving unit can receive the AC power input to the power transmission unit in a contactless manner by magnetic field resonance or electromagnetic induction, and the transmittable condition is that the power transmission unit and the power reception unit are magnetic fields. It may be arranged at a position where resonance or electromagnetic induction is possible. According to this configuration, AC power can be transmitted in a non-contact manner from the power transmission unit to the power reception unit. Therefore, since an operation such as a wired connection is unnecessary, the convenience can be improved.

  In addition, as a specific configuration of “the power transmission unit and the power reception unit are arranged at positions where magnetic resonance or electromagnetic induction can be performed”, for example, the power transmission unit and the power reception unit perform transmission between the two. A configuration in which the efficiency is arranged at a position that is equal to or higher than a predetermined threshold efficiency is conceivable.

  For the power transmission system, the specifying unit includes a grasping unit that grasps the unused power transmission unit that is not in use, and when the grasping unit recognizes a plurality of unused power transmission units, The target power transmission unit may be specified from among a plurality of unused power transmission units. According to such a configuration, an unused power transmission unit is grasped while a used power transmission unit is not grasped. Thereby, the number of grasped power transmission units can be reduced, and the processing load related to the specification can be reduced and the specification can be facilitated.

  In the power transmission system, the identifying unit sequentially inputs the AC power to each unused power transmission unit when the grasping unit grasps a plurality of unused power transmission units. The target power transmission unit may be specified based on the timing at which the AC power is received by the power reception unit. According to this configuration, the AC power input timing is different for each unused power transmission unit by sequentially inputting AC power to the unused power transmission unit. Thereby, the power reception timing at which AC power is received by the power reception unit is different for each unused power transmission unit. Therefore, the target power transmission unit can be suitably specified based on the power reception timing.

  In this case, if a plurality of power transmission units are grasped, the time until the identification is likely to be long due to the different input timings. On the other hand, by excluding the power transmission units in use from the power transmission units grasped by the grasping unit, the number of power transmission units grasped can be reduced, thereby reducing the time required for identification. Can be planned. Further, inconvenience due to the input of AC power to the power transmission unit in use, for example, wasteful power consumption can be avoided.

  Regarding the power transmission system, the power transmission device 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 power reception side communication unit includes a predetermined response. When transmitting the request signal and the power transmission side communication unit receives the response request signal in a situation where the power transmission device has the power transmission unit in the unused state, the power transmission side communication unit relates to the power transmission unit in the unused state. A response signal having information is transmitted to the power-receiving-side communication unit. On the other hand, if the response request signal is received in a situation where the power transmission device does not have the unused power transmission unit, the response signal is not transmitted. Good. According to such a configuration, when a response request signal is received by the power transmission side communication unit of the power transmission apparatus having an unused power transmission unit, a response having information on the power transmission unit is received from the power transmission side communication unit. A signal is transmitted. By receiving the response signal by the power receiving side communication unit, it is possible to grasp the unused power transmission unit.

  On the other hand, when the response request signal is received by the power transmission side communication unit of the power transmission apparatus that does not have an unused power transmission unit, the response signal is not transmitted. Thereby, it can avoid grasping | ascertaining the power transmission part of use condition.

  In the power transmission system, the power transmission device has a power transmission connector provided at one end of a cable through which power is transmitted as the power transmission unit, and the power reception device can be connected to the power transmission connector as the power reception unit. The power transmission condition may be that the power transmission connector and the power reception connector are connected. According to such a configuration, power transmission can be performed in a wired manner from the power transmission unit to the power reception unit.

  A power transmission device that achieves the above object includes one or a plurality of power transmission units, and transmits power to a power reception device having a power reception unit capable of receiving power from the power transmission unit, wherein the power transmission unit is predetermined. When the transmitted transmission condition is satisfied, the power reception unit is capable of transmitting power, and the power transmission device is present when the target power transmission unit that is the power transmission unit that satisfies the transmission capability condition exists. A usage state setting unit for setting the target power transmission unit to a usage state, and a power transmission process for executing power transmission processing for transmitting power to the power reception unit via the target power transmission unit until a predetermined termination condition is satisfied. An execution unit and a use state maintaining unit that maintains the use state even after the termination condition is satisfied are provided.

  According to this configuration, when there is a target power transmission unit that satisfies the transmittable condition, power is transmitted to the power reception unit via the target power transmission unit until the end condition is satisfied. In such a configuration, the target power transmission unit remains in use even after the termination condition is satisfied. Thereby, even after the termination condition is satisfied, it is possible to grasp that the target power transmission unit is in use. Therefore, it is possible to appropriately grasp the usage status of each power transmission unit.

  According to this invention, the usage status of each power transmission unit can be suitably grasped.

The perspective view which shows the outline | summary of the electric power transmission system of 1st Embodiment. The block diagram which shows the electric constitution of an electric power transmission system. The flowchart which shows a series of processes performed in an electric power transmission system. The schematic diagram for demonstrating a series of processes performed in an electric power transmission system. The perspective view which shows the outline | summary of the electric power transmission system of 2nd Embodiment. The block diagram which shows the electric constitution of the electric power transmission system of 2nd Embodiment. The schematic diagram which shows the outline | summary of the electric power transmission system of 3rd Embodiment.

(First embodiment)
Hereinafter, a first embodiment of the power transmission system will be described.
As shown in FIG. 1, the power transmission system 10 includes a power transmission device 11 (charging station) and a power reception device 12 (vehicle side device) capable of transmitting 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.

  Incidentally, the condition of magnetic field resonance includes the positional relationship between the primary side coils 22 a and 22 b and the secondary side coil 31. Specifically, in order to perform power transmission by magnetic field resonance, it is necessary that one of the primary side coils 22a and 22b and the secondary side coil 31 be arranged close enough to cause magnetic field resonance. That is, the transmittable condition, which is a condition for allowing any one of the primary side coils 22a and 22b and the secondary side coil 31 to transmit power, is that either the primary side coil 22a or 22b and the secondary side coil 31. Is arranged at a position where magnetic field resonance is possible. More specifically, the transmission possible condition is that the transmission efficiency between the two is determined in advance when power is transmitted from either the primary side coil 22a or 22b to the secondary side coil 31 by magnetic field resonance, for example. It is more than the threshold efficiency.

  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 measuring unit 34 that measures AC power received by the secondary coil 31 (hereinafter simply referred to as “received power”). The measurement unit 34 transmits the measurement result to a power receiving side controller 35 as a power receiving side control unit provided in the power receiving 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) at which the received power is measured based on the measurement result of the measuring 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 a and 11 b are installed, the plurality of power transmission devices 11 a and 11 b are included in the wireless communicable range of the power receiving side communication unit 36. That is, the power receiving side communication unit 36 can wirelessly communicate with the power transmission side communication units 24a and 24b of the plurality of power transmission devices 11a and 11b.

  The power transmission system 10 performs the current transmission target by exchanging signals between the power transmission side controllers 23a and 23b (each power transmission side communication units 24a and 24b) and the power reception side controller 35 (power reception side communication unit 36). The target coil (target power transmission unit) that is the primary coil that satisfies the transmittable condition for the secondary coil 31 is specified. Then, the power transmission system 10 performs power transmission while setting the target coil in a use state. A series of these processing configurations will be described in detail.

  Here, in this embodiment, as shown in FIG. 4, as an example, it is assumed that the first vehicle C1 is arranged in the first parking space S1, and the second vehicle C2 is arranged in the second parking space S2. In this case, the first vehicle C1 is first arranged in the first parking space S1, and after the charging of the vehicle battery 33 of the first vehicle C1 is completed, the second vehicle C2 is arranged in the second parking space S2. Shall be.

  For convenience of explanation, the power receiving device 12, the secondary coil 31, the power receiving controller 35, and the power receiving communication unit 36 mounted on the first vehicle C1 are replaced with the first power receiving device 12a and the first secondary coil. 31a, the first power receiving side controller 35a and the first power receiving side communication unit 36a. Then, the power receiving device 12, the secondary side coil 31, the power receiving side controller 35, and the power receiving side communication unit 36 mounted on the second vehicle C2 are replaced with the second power receiving device 12b, the second secondary side coil 31b, the second The power receiving side controller 35b and the second power receiving side communication unit 36b are used.

  In addition, at the timing before the first vehicle C1 is arranged, the primary side coils 22a and 22b are in a state that is not in use (that is, unused). Details of the usage state will be described later.

  When the first vehicle C1 is placed (stopped) in the first parking space S1, as shown in FIG. 3, the first power receiving side controller 35a and the first power receiving side communication unit 36a and the power transmission in steps S101 to S103. The primary side coil which exists in the vicinity of the 1st vehicle C1 is grasped | ascertained using the radio | wireless communication via the side communication parts 24a and 24b.

  Specifically, the first power receiving side controller 35a first searches in step S101 as a response request signal within a predetermined specific range (in this embodiment, the wireless communicable range of the first power receiving side communication unit 36a). The first power receiving side communication unit 36a is controlled so that the signal is transmitted by broadcast.

  The power transmission side controllers 23a and 23b determine whether or not the primary side coils 22a and 22b are in use when the search signal is received by the power transmission side communication units 24a and 24b. When the primary side coils 22a and 22b are not in use, that is, in the unused state, the power transmission side controllers 23a and 23b transmit the response signal to the first power reception side controller 35a. 24b is controlled.

  In the present embodiment, since the first primary coil 22a is not in use at the timing when the search signal is received, the first power transmission controller 23a identifies the first power transmission device 11a in step S102. The first power transmission side communication unit 24a is controlled such that a response signal having the following is transmitted. Similarly, the 2nd power transmission side controller 23b controls the 2nd power transmission side communication part 24b so that the response signal which has the identification information of the 2nd power transmission apparatus 11b may be transmitted in step S103.

  In the present embodiment, the first power transmission device 11a has one primary coil. 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 response signal which has the identification information of the 1st power transmission apparatus 11a is a response signal which has the information regarding the 1st primary side coil 22a. The same applies to the response signal having the identification information of the second power transmission device 11b.

  The first power receiving side controller 35a grasps the power transmission device 11 when the response signal is received by the first power receiving side communication unit 36a. The first power receiving side controller 35a recognizes that only one power transmission device 11 exists when only one response signal is received by the first power receiving side communication unit 36a. On the other hand, when the first power receiving side controller 35a receives a plurality of types of response signals having different identification information by the first power receiving side communication unit 36a, the first power receiving side controller 35a recognizes that there are a plurality of power transmitting devices 11 within the wireless communicable range. .

  And the 1st power receiving side controller 35a produces the list | wrist of power transmission apparatus 11a, 11b grasped | ascertained based on the response signal in step S104. Identification information of the power transmission apparatuses 11a and 11b is set in the list.

  Thereafter, the first power receiving side controller 35a instructs each power transmitting device 11a, 11b to sequentially input AC power to the primary side coils 22a, 22b of each power transmitting device 11a, 11b set in the list. Put out.

  Specifically, in step S105, the first power receiving side controller 35a requests (instructs) transmission of AC power to the power transmission device 11 (for example, the first power transmission device 11a) set first in the list. The first power receiving side communication unit 36a is controlled so that the power transmission request signal is transmitted. The first power transmission side controller 23a of the first power transmission device 11a, based on the reception of the power transmission request signal by the first power transmission side communication unit 24a, supplies AC power to the first primary side coil 22a in step S106. The first power supply unit 21a is controlled so as to be input. In this case, the power value of the AC power input to the first primary coil 22 a is smaller than the power value of the charging power used to charge the vehicle battery 33. Incidentally, it can be said that the process of step S106 (AC power input control process) is an output control process for outputting AC power from the first power supply unit 21a.

  In a state where AC power is input to the first primary side coil 22a, the first power receiving side controller 35a determines whether or not the received power is measured based on the measurement result of the measuring unit 34 in step S107. Determine.

  When the received power is measured by the measurement unit 34 within a predetermined time after the transmission request signal is transmitted to the first power transmission side communication unit 24a, the first secondary coil 31a that is the current power transmission target. And the first primary coil 22a satisfy the transmission possible condition. In this case, the first power receiving side controller 35a makes an affirmative determination in step S107 and identifies the first primary coil 22a as the target coil. That is, when the received power is measured by the measurement unit 34, the first power-receiving-side controller 35a identifies the primary coil to which AC power is input at the timing when the received power is measured as the target coil. To do.

  When the target coil is grasped, in step S108, the first power receiving side controller 35a transmits a search end notification to each power transmission side controller 23a, 23b (each power transmission side communication unit 24a, 24b) by broadcast. The first power receiving side communication unit 36a is controlled. The first power transmission side controller 23a stops the input of AC power to the first primary side coil 22a when the search end notification is received by the first power transmission side communication unit 24a.

  Thereafter, the first power receiving side controller 35a and the first power transmitting side controller 23a of the first power transmitting device 11a that is the power transmitting device 11 having the target coil are the first power transmitting device 11a and the first power receiving device 12a. The connection established state is established in which the connection via the power transmission side communication unit 24a and the first power reception side communication unit 36a is established.

  In detail, the 1st power receiving side controller 35a controls the 1st power receiving side communication part 36a so that a connection request signal may be transmitted with respect to the 1st power transmission side controller 23a in step S109. 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 first transmits the connection response signal to the first power reception side communication unit 36a in step S110. The power transmission side communication unit 24a is controlled. And the 1st power receiving side controller 35a is recognized that the 1st power transmission apparatus 11a and the 1st power receiving apparatus 12a will be in the connection establishment state, when a connection response signal is received by the 1st power receiving side communication part 36a (authentication). ) As a result, information regarding power transmission can be exchanged via the first power transmission side communication unit 24a and the first power reception side communication unit 36a.

  That is, the information (signal) exchanged between the first power transmission side communication unit 24a and the first power reception side communication unit 36a in the processing of step S101 to step S108 is information for specifying the target coil. Then, when the target coil is specified and the connection is established, information necessary for subsequent processing (for example, a charging sequence) and more specific information (for example, a vehicle) of the first power transmission device 11a and the first power reception device 12a. The charging state of the battery 33 is exchanged. In other words, it can be said that the connection establishment state is a state in which the power transmission device 11 and the power reception device 12 set in the connection establishment state have been authenticated as counterparts to exchange information for performing power transmission with each other. .

  Thereafter, in step S111, the first power transmission side controller 23a sets the first primary side coil 22a to the use state. In detail, the 1st power transmission side controller 23a sets the flag which shows that it is a use state to the storage area provided in the said 1st power transmission side controller 23a. In this case, the first primary coil 22a transmits power to the first secondary coil 31a until the use state is released, while the target coil related to the second secondary coil 31b. In the specific processing (steps S117 to S120), it is excluded from the grasp targets. In addition, as a specific structure which sets an object coil to a use condition, if it is comprised so that it can identify that an object coil is a use condition (in use), it is not restricted above, but is arbitrary.

  On the other hand, if the received power is not measured within a predetermined time after the power transmission request signal is transmitted to the first power transmission side communication unit 24a, the first power receiving side controller 35a makes a negative determination in step S107, Proceeding to step S112, additional search processing is executed. In the additional search process, the first power receiving side controller 35a transmits the power transmission stop request signal to the first power transmitting side communication unit 24a, and then the second power transmitting side communication of the second power transmitting device 11b set second. The first power receiving side communication unit 36a is controlled so that the power transmission request signal is transmitted to the unit 24b.

  The 1st power transmission side controller 23a stops the input of the alternating current power with respect to the 1st primary side coil 22a, when the power transmission stop request signal is received by the 1st power transmission side communication part 24a. When the second power transmission side controller 23b receives the power transmission request signal by the second power transmission side communication unit 24b, the second power supply unit 23b is configured so that AC power is input to the second primary coil 22b. 21b is controlled. In this state, the first power receiving side controller 35a determines whether or not the received power is measured based on the measurement result of the measuring unit 34. Then, when the received power is measured, the first power receiving side controller 35a specifies that the second primary coil 22b is the target coil, and issues a search end notification. Thereafter, the second power transmission side controller 23b and the first power reception side controller 35a set the second power transmission device 11b and the first power reception device 12a to the connection established state, and the second primary side coil 22b is in the use state. Set to.

  That is, in the present embodiment, the power transmission system 10 is configured to start input of AC power to the second primary coil 22b after input of AC power to the first primary coil 22a is stopped. Has been.

  Incidentally, the first power receiving side controller 35a is able to measure the received power even though the power transmission request signal is transmitted to all the power transmission devices 11a and 11b set in the list. May notify that an error has occurred and stop the execution of the subsequent processing.

  Next, the charging sequence in step S113 will be described. The charging sequence is executed based on the fact that the first power transmitting device 11a and the first power receiving device 12a are in a connection established state. In other words, it is an execution condition of the charging sequence that the connection established state is set.

  In step S113, the first power transmission side controller 23a and the first power reception side controller 35a execute various processes for charging the vehicle battery 33 while exchanging information with each other.

  The charging sequence will be specifically described. First, the first power transmission side controller 23a controls the first power supply unit 21a so that the charging power is input to the first primary coil 22a. As a result, the vehicle battery 33 is charged using the charging power.

  During the charging, the first power receiving side controller 35a periodically transmits the power value of the received power to the first power transmitting side controller 23a using the first power receiving side communication unit 36a. The 1st power transmission side controller 23a controls the electric power value of the alternating current power input into the 1st primary side coil 22a based on the electric power value of the received electric power.

  In addition, the first power receiving side controller 35a determines whether or not a predetermined end condition is satisfied. If the end condition is satisfied, the first power receiving side communication unit 36a is used to perform the first power transmission. An end notification is transmitted to the side controller 23a. The 1st power transmission side controller 23a complete | finishes input control of alternating current power based on completion notification. Thereby, a charge sequence is complete | finished.

  The termination condition is, for example, when the state of charge of the vehicle battery 33 becomes a predetermined full charge state (termination trigger state) based on the detection result of the SOC sensor, or when there is some abnormality in power transmission. The case where it generate | occur | produces etc. can be considered.

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

  The first power transmission side controller 23a and the first power reception side controller 35a execute processing for continuing the connection establishment state when the termination condition is satisfied and the charging sequence is terminated. In detail, the 1st power receiving side controller 35a transmits a connection continuation request signal with respect to the 1st power transmission side communication part 24a using the 1st power receiving side communication part 36a in step S114. When the first power transmission side controller 23a receives the connection continuation request signal by the first power transmission side communication unit 24a, the first power transmission side controller 23a continues the connection establishment state in step S115 and uses the first power transmission side communication unit 24a. A connection continuation response signal is transmitted to the first power receiving side communication unit 36a. Thereby, the connection establishment state of the 1st power transmission apparatus 11a and the 1st power receiving apparatus 12a is continued.

  In Step S116, the 1st power receiving side controller 35a maintains the use state of the 1st primary side coil 22a. In detail, the 1st power receiving side controller 35a maintains, without deleting the flag which shows that it is a use state. Thus, the first primary coil 22a is recognized as being used even after the charging sequence is completed.

  Thereafter, when the second vehicle C2 is arranged in the second parking space S2, the second power receiving side controller 35b transmits a search signal using the second power receiving side communication unit 36b in step S117.

  As already described, the power transmission side communication units 24a and 24b transmit a response signal when receiving a search signal in a situation where the primary side coils 22a and 22b are unused. On the other hand, the power transmission side communication units 24a and 24b are configured not to transmit a response signal when a search signal is received in a situation where the primary side coils 22a and 22b are in use.

  At the timing of the process in step S117, the first primary coil 22a is in use, while the second primary coil 22b is not in use. For this reason, while the 1st power transmission side controller 23a refuses transmission of a response signal in Step S118, the 2nd power transmission side controller 23b uses the 2nd power transmission side communication part 24b in Step S119. Send. Thereby, the 2nd power receiving side controller 35b grasps | ascertains the 2nd power transmission apparatus 11b (2nd primary side coil 22b), but does not grasp | ascertain the 1st power transmission apparatus 11a (1st primary side coil 22a). In other words, the primary coil in use is excluded from the primary coil grasped by the second power receiving controller 35b.

  Thereafter, the second power transmission side controller 23b and the second power reception side controller 35b execute processing such as identification of a target coil and setting of a use state in step S120, and execute a charging sequence in step S121. . Since the specific content of each of these processes has already been described, description thereof will be omitted.

  Here, in a situation where the first power transmission device 11a and the first power reception device 12a are in a connection established state, the first power transmission side controller 23a and the first power reception side controller 35a are periodically or irregularly. Exchanges signals.

  For example, if the received power is measured for some reason, the first power receiving controller 35a notifies the first power transmitting controller 23a to that effect. Thereby, the 1st power transmission side controller 23a can grasp | ascertain that power transmission may be performed accidentally.

  In addition, for example, the first power receiving side controller 35a grasps the state of charge of the vehicle battery 33 and notifies the fact when recharging is necessary. The first power transmission side controller 23a performs power transmission again based on the notification.

  In such a configuration, the first power transmission side controller 23a and the first power reception side controller 35a release the connection established state when a predetermined release condition is satisfied. Specifically, in step S122, the first power receiving side controller 35a transmits a connection release request signal to the first power transmitting side controller 23a using the first power receiving side communication unit 36a. When the connection cancellation request signal is received by the first power transmission side communication unit 24a, the first power transmission side controller 23a cancels the connection establishment state of the first power transmission device 11a in step S123, and the first power transmission side communication is performed. The connection release response signal is transmitted to the first power receiving side communication unit 36a using the unit 24a. The first power receiving side controller 35a releases the connection establishment state of the first power receiving device 12a based on the reception of the connection release response signal by the first power receiving side communication unit 36a.

Here, the release condition is arbitrary as long as it is no longer necessary to exchange information. For example, there is a high probability that the first vehicle C1 moves.
The case where the probability that the first vehicle C1 moves is high is, for example, when the first vehicle C1 is activated to be able to travel, specifically when the accelerator is operated, or when the first vehicle C1 is hybrid. In the configuration which is a vehicle, the case where an engine starts, etc. are considered.

  In step S124, the first power transmission side controller 23a cancels the use state of the first primary coil 22a and sets it to the unused state. Specifically, the first power transmission side controller 23a deletes the flag indicating that it is in use.

Next, the operation of this embodiment will be described.
When the plurality of primary coils 22a and 22b are grasped by the first power receiving side controller 35a, the target coil that satisfies the condition for transmission with the first secondary coil 31a among the plurality of primary coils 22a and 22b. As a first primary coil 22a is specified. In this case, the first primary coil 22a is set to a use state. And after a charge sequence is performed and a charge sequence is complete | finished, the use condition of the 1st primary side coil 22a is maintained.

According to the embodiment described above in detail, the following effects are obtained.
(1) The power transmission system 10 includes a first power transmission device 11a having a first primary coil 22a to which AC power is input, and a second having a second primary coil 22b to which AC power is input. And a power transmission device 11b. In addition, the power transmission system 10 includes a power receiving device 12 having a secondary coil 31. The primary side coils 22a and 22b and the secondary side coil 31 can transmit power when a predetermined transmission enable condition is satisfied.

  In such a configuration, the power transmission system 10 executes a process (step S101 to step S108, etc.) for identifying a target coil that satisfies the transmittable condition among the plurality of primary coils 22a and 22b. And the electric power transmission system 10 performs the process (step S111) which sets an object coil to use condition. Further, the power transmission system 10 executes a charging sequence (step S113) for performing power transmission between the target coil and the secondary coil 31 until a predetermined termination condition is satisfied. And the electric power transmission system 10 is comprised so that the use state of an object coil may be maintained even after completion | finish conditions are satisfied.

  According to such a configuration, since the use state of the target coil is maintained even after the charging sequence, it can be understood that the target coil is in use even after the charging sequence is completed. Therefore, the usage situation of each primary side coil 22a, 22b can be grasped | ascertained suitably.

  Here, after the charge sequence is completed, the target coil plays a role of transmitting power to the secondary coil 31 that satisfies the transmittable condition with the target coil. Therefore, it is possible to cancel the use state of the target coil. . However, when the usage state of the target coil is canceled, the power receiving device 12 (second power receiving device 12b) is different from the power receiving device 12 (first power receiving device 12a) having the secondary coil 31 that satisfies the transmittable condition with the target coil. If the target coil is not in use, misidentification may occur. On the other hand, according to the present embodiment, the misperception can be avoided by maintaining the target coil in the use state even after the charging sequence is finished.

  Further, in the target coil identification process (steps S117 to S120) performed by the second power receiving side controller 35b, the first primary side coil 22a in use can be excluded when grasping the primary side coil. Therefore, the identification of the target coil can be facilitated.

  Incidentally, the function of executing the processes of Steps S101 to S108 and Steps S117 to S120 in the power transmission side controllers 23a and 23b and the power reception side controllers 35a and 35b corresponds to the specifying unit, among which Steps S101 to S103 and Steps S117 to The function for executing the process of step S119 corresponds to the grasping unit. Moreover, the function which performs the process of step S111 in the 1st power transmission side controller 23a respond | corresponds to a use condition setting part, and performs the process of step S113 and step S121 in the power transmission side controllers 23a and 23b and the power receiving side controllers 35a and 35b. The function corresponds to a power transmission process execution unit (power transmission process execution unit). The function of executing the process of step S116 in the first power transmission side controller 23a corresponds to the use state maintaining unit.

  (2) The 1st power transmission apparatus 11a is provided with the 1st primary side coil 22a into which alternating current power is input as a power transmission part. The first power receiving device 12a includes, as a power receiving unit, a first secondary coil 31a that can receive AC power from the first primary coil 22a in a contactless manner by magnetic field resonance. In such a configuration, the transmittable condition is that the first primary coil 22a and the second secondary coil 31b are arranged at positions where magnetic field resonance is possible. Thereby, electric power transmission can be performed in a contactless manner without performing an operation of connecting the first power transmission device 11a and the first power reception device 12a using a cable. Therefore, convenience can be improved.

  (3) The power transmission system 10 (for example, each controller 23a, 23b, 35a) grasps the unused primary side coil that is not in use, and identifies the target coil from among the unused primary side coils. It is configured as follows. According to such a configuration, since the primary coil in use is not grasped, the primary coil in use is excluded from candidates for specifying the target coil. Thereby, the number of candidates for specifying the target coil can be reduced. Therefore, the identification of the target coil can be facilitated, and the processing load related to the identification can be reduced.

  Here, in the case of performing power transmission between the power transmitting device and the power receiving device by wire, the transmittable condition is that the cables are connected. In this case, since it can be determined relatively easily whether or not they are connected by a cable, the combination of the power transmitting device 11 and the power receiving device 12 that satisfy the transmittable condition can be easily specified.

  On the other hand, in non-contact power transmission, the transmission possible condition is related to the positional relationship between the primary side coils 22a and 22b and the secondary side coil 31, and it is complicated to specify a combination satisfying the transmission possible condition. It is easy to become a thing.

  On the other hand, in the present embodiment, the number of candidates can be reduced by excluding the primary coil in use from the candidates that can be the target coil at the time of identification, and the complexity involved in the identification. Can be reduced.

  (4) When the power transmission system 10 (for example, each controller 23a, 23b, 35a) grasps a plurality of unused primary coils, AC power is supplied to each unused primary coil. Are sequentially input, and the target coil is specified based on the power reception timing at which the AC power is received by the secondary coil 31. According to such a configuration, by sequentially inputting AC power to the unused primary side coil, the input timing of AC power differs for each unused primary side coil. Based on the power reception timing at which AC power is received by the secondary coil 31, it is possible to identify the target coil that is the primary coil that has transmitted the received AC power. Therefore, the target coil can be suitably specified based on the power reception timing.

  In this case, if a plurality of primary side coils are grasped, the time until the identification is likely to be long because of different input timings. On the other hand, the number of primary coils to be grasped can be reduced by excluding the used primary side coils from the grasped primary coils, and the time required for identification can be reduced through this. Shortening can be achieved. Further, it is possible to avoid inconvenience due to the input of AC power to the primary coil in use, for example, useless power consumption.

  (5) The power receiving side communication unit 36 of the power receiving side controller 35 transmits a search signal as a predetermined response request signal. When the power transmission side communication units 24a and 24b receive a search signal in a situation where the primary side coils 22a and 22b are not used, information on the primary side coils 22a and 22b (specifically, the power transmission devices 11a and 22b) The response signal having the identification information 11b) is transmitted. On the other hand, the power transmission side communication units 24a and 24b do not transmit a response signal when receiving the search signal in a situation where the primary side coils 22a and 22b are in use. Therefore, the power receiving side controller 35 can grasp only the unused primary side coil.

  (6) The power transmission system 10 (for example, each controller 23a, 35a) cancels the use state of the primary side coil when the predetermined release condition is satisfied after the end condition is satisfied, and is not used. It is configured to be in a state. Thereby, the use state of the primary side coil is maintained until the release condition is satisfied after the end condition is satisfied. Thereby, it can avoid specifying the primary side coil set to use condition as the object coil of the secondary side coil 31 of the other power receiving apparatus 12 until cancellation conditions are satisfied. In addition, the function which performs the process of step S124 in the 1st power transmission side controller 23a respond | corresponds to a cancellation | release part.

  (7) When the first primary coil 22a is specified as the target coil, the power transmission system 10 includes the first power transmission device 11a having the first primary coil 22a and the first primary coil. 22a and the power receiving apparatus 12 having the secondary coil 31 that satisfies the transmittable condition are configured to be set in a connection establishment state in which a connection through each of the communication units 24a and 36 is established. And the said connection establishment state is continued even after completion | finish of a charge sequence. Thereby, information can be exchanged between the first power transmitting device 11a and the power receiving device 12 even after the charging sequence. Thereby, the 1st power transmission apparatus 11a and the power receiving apparatus 12 can grasp | ascertain a condition mutually. Therefore, for example, it is possible to appropriately grasp when wrong power transmission is performed or when recharging is necessary.

(Second Embodiment)
As shown in FIG. 5, in the present embodiment, the power transmission device 50 includes a plurality of primary coils 51 to 53. The primary coils 51 to 53 are installed in the parking spaces S1 to S3. As illustrated in FIG. 6, the power transmission device 50 includes a plurality of power supply units 61 to 63. AC power from the first power source 61 is input to the first primary coil 51, AC power from the second power source 62 is input to the second primary coil 52, and third AC power from the third power supply unit 63 is input to the primary coil 53. Note that one power transmission device 50 may be provided, or a plurality of power transmission devices 50 may be provided in parallel.

  Here, each of the power supply units 61 to 63 can individually switch on / off of the output of the AC power, and can change the power value (at least one of the voltage value and the current value) of the output AC power. is there. For this reason, each power supply part 61-63 can change the input pattern of the alternating current power input into each primary side coil 51-53, respectively.

  In this configuration, the power transmission side controller 70 provided in the power transmission device 50 is unused among the plurality of primary coils 51 to 53 when the search signal from the power reception side controller 35 is received by the power transmission side communication unit 71. The primary coil in the state is grasped. Then, when there is at least one unused primary side coil, the power transmission side controller 70 transmits a response signal having information related to the unused primary side coil. 71 is controlled. The information on the unused primary side coil may be, for example, identification information of each unused primary side coil, information on the number of unused primary side coils, and the like.

  The power transmission side controller 70 (power transmission side communication unit 71) does not transmit a response signal when there is no unused primary side coil as a result of grasping the unused primary side coil. Alternatively, a response signal indicating that there is no unused primary coil may be transmitted.

  The power receiving side controller 35 receives the response signal by the power receiving side communication unit 36, thereby grasping the unused primary side coils and creating a list of the unused primary side coils. Then, the power receiving side controller 35 issues an instruction to the power transmitting side controller 70 so that AC power is sequentially input to each unused primary side coil. Based on the power transmission side controller 70 and the instruction | indication, alternating current power is sequentially input with respect to each primary side coil 51-53. And the power receiving side controller 35 specifies an object coil by collating the timing at which received power was measured, and the input timing of the alternating current power with respect to each unused primary side coil. When the target coil is specified, the power transmission controller 70 sets the target coil to the use state.

  As a specific configuration for grasping the unused primary side coil, for example, the power transmission side controller 70 is provided with first to third storage areas corresponding to the primary side coils 51 to 53. When the target coil is specified, the power transmission side controller 70 sets a flag indicating that it is in use in the storage area corresponding to the target coil. And the power transmission side controller 70 is good to grasp | ascertain the primary side coil of an unused state by whether the flag is set to each storage area. Moreover, the power transmission side controller 70 erase | eliminates the said flag, when cancellation | release conditions are satisfied.

According to this embodiment explained in full detail above, there exist the following effects.
(8) In the configuration in which the power transmission device 50 includes a plurality of primary coils 51 to 53, the power transmission side communication unit 71 of the power transmission device 50 receives an unsearched signal among the primary coils 51 to 53 when receiving a search signal. A response signal having information on the primary coil in use is transmitted. Thus, the power receiving controller 35 can grasp the unused primary side coil, while avoiding grasping the used primary side coil. Also in the present embodiment, the effects (1) to (7) are obtained.

(Third embodiment)
In the present embodiment, the power transmission system 10 is different from the above embodiments in that the power transmission system 10 is a contact type power transmission. The different points will be described below.

  As illustrated in FIG. 7, the power transmission device 100 according to the present embodiment includes a cable 101 that transmits AC power and a power transmission connector 102 provided at one end of the cable 101 as a power transmission unit. The power receiving device 110 mounted on the vehicle C has a power receiving connector 111 that can be connected to the power transmitting connector 102. The power receiving connector 111 is connected to the vehicle battery 33 via the rectifier 32. Note that, as in the first embodiment, a plurality of power transmission devices 100 are arranged in parallel.

  According to this configuration, when the power transmission connector 102 and the power reception connector 111 are connected, AC power is received by the power reception connector 111, and the received AC power is rectified and input to the vehicle battery 33. . That is, the transmission possible condition in the present embodiment is that the power transmission connector 102 and the power reception connector 111 are connected.

  Here, the cable 101 has a plurality of lines, and signals are transmitted in addition to the AC power. When the power transmission connector 102 and the power reception connector 111 are connected, the power transmission side controller 103 provided in the power transmission device 100 and the power reception side controller 112 provided in the power reception device 110 are connected via the cable 101. Connected.

  Each controller 103, 112 determines whether or not the power transmission connector 102 and the power reception connector 111 are connected by determining whether or not the connection via the cable 101 is established. And each controller 103,112 specifies that the transmission possible condition is satisfy | filled, when the power transmission connector 102 and the power receiving connector 111 are connected. In this case, the power transmission side controller 103 sets the power transmission connector 102 to the use state.

  Further, when the power transmission connector 102 and the power reception connector 111 are connected, each of the controllers 103 and 112 includes a power transmission side communication unit 104 provided in the power transmission device 100 and a power reception side communication unit 113 provided in the power reception device 110. Establish a connection over Since the subsequent specific configuration (charging sequence, configuration for maintaining / releasing the usage state) and the like are the same as those in the first embodiment, description thereof will be omitted.

According to the embodiment described above in detail, the following operational effects are obtained.
(9) The power transmission device 100 includes a power transmission connector 102 provided at one end of the cable 101 as a power transmission unit, and the power reception device 110 includes a power reception connector 111 that can be connected to the power transmission connector 102 as a power reception unit. Yes. Then, by connecting the power transmission connector 102 and the power reception connector 111, it is possible to transmit power from the power transmission device 100 to the power reception device 110 via the cable 101.

  In such a configuration, each of the controllers 103 and 112 determines whether or not the transmission possible condition is satisfied based on whether or not the connection via the cable 101 is established (whether or not information can be exchanged). judge. Then, when the connection between the controllers 103 and 112 is established via the cable 101, the power transmission side controller 103 sets the power transmission connector 102 to the use state. And each controller 103,112 performs the charge sequence which performs electric power transmission until predetermined termination conditions are satisfied. The usage state of the power transmission connector 102 is maintained even after the end condition is satisfied.

  According to such a configuration, the usage status of the power transmission connector 102 can be grasped. Thereby, when the power transmission connector 102 of the power transmission device 100 is in use, the vehicle C can be guided to the side where the power transmission device 100 having the power transmission connector 102 in the unused state is installed. In particular, in a vehicle C or the like that performs automatic driving, the vehicle C can be automatically arranged in the vicinity of the unused power transmission connector 102, so that convenience can be improved.

In addition, you may change each said embodiment as follows.
○ The specific configuration for specifying the target coil is arbitrary. For example, the power value and input time of AC power input to each unused primary coil set in the list may be different for each unused primary coil. Even in this case, it is possible to specify which unused primary coil is the target coil based on the power value of the received power, the time when the received power is measured, and the like. In this alternative example, the input timing of AC power to each unused primary coil may be the same or different. That is, as long as the target coil can be specified, it is not essential to sequentially input AC power to each unused primary coil.

  In addition, a configuration in which a sensor that performs laser scanning of the periphery is provided and the target coil is specified by laser scanning may be used. In this case, by excluding the periphery of the range where the primary coil in use is present from the laser scan range, it is possible to shorten the time required for the laser scan and the data processing obtained by the laser scan. .

  In each embodiment, the charging sequence is performed after the target coil is set to the use state. However, the present invention is not limited to this, and the target coil may be set to the use state during the charging sequence. In addition, the use state may be set before the connection establishment state is set (the processing in steps S109 and S110).

○ Connection establishment status and usage status do not have to be linked. For example, after the charging sequence is finished, the connection establishment state may be canceled while the use state is maintained.
○ Setting of connection establishment status may be omitted. That is, setting of the connection establishment state and continuation of the connection establishment state are arbitrary.

  Although the 1st power receiving side controller 35a was the structure which transmits a search signal in order to grasp | ascertain the unused primary side coil, it is not restricted to this. For example, the 1st power transmission side controller 23a transmits the beacon which has the information regarding the primary side coil of an unused state regularly, and the 1st power receiving side controller 35a receives the beacon, and is in an unused state. The structure which grasps | ascertains a primary side coil may be sufficient.

  The power receiving side controller 35 may make a usage state setting request to the power transmission side controllers 23a and 23b, and the power transmission side controllers 23a and 23b may set the usage state in response to the setting request. In this case, it can be said that the power receiving side controller 35 is a use state setting unit.

  ○ The number of primary side coils provided in the first power transmission device 11a and the number of primary side coils provided in the second power transmission device 11b may be the same or different, and are single. There may be more than one.

  ○ In order to identify the target coil, the power value of the AC power input to each primary coil 22a, 22b, etc. was smaller than the power value of the charging power, but this is not restrictive, and both are the same It may be set.

In the third embodiment, the power to be transmitted is not limited to AC power but may be DC power. In this case, the rectifier 32 may be omitted.
In the third embodiment, one power transmission device 100 may include a plurality of power transmission connectors 102.

  If the power transmission system 10 is configured to continue the connection establishment state without performing the processing of step S114 and step S115, the processing of step S114 and step S115 may be omitted.

Similarly, the process of step S116 may be omitted as long as the use state is maintained without performing the process of step S116.
The measuring unit 34 measures the AC power received by the secondary side coil 31, but is not limited thereto, and may measure the DC power rectified by the rectifier 32.

  ○ When the power transmission request signals are received by the power transmission side communication units 24a and 24b, the power transmission side controllers 23a and 23b receive AC power input to the primary side coils 22a and 22b over a predetermined period. The structure which makes it may be sufficient. In this case, in step S107, the first power receiving side controller 35a may determine whether or not the received power is measured during the specific period after the transmission request signal is transmitted.

  In the second embodiment, the power transmission side controller 70 is configured to control the input pattern of AC power input to the primary side coils 51 to 53 by performing output control of the power supply units 61 to 63. However, it is not limited to this. For example, even if each primary side coil 51-53 is connected in parallel with respect to one power supply part and a switching element is provided on each power transmission line which connects a power supply part and each primary side coil 51-53, respectively. Good. And the power transmission side controller 70 may each vary the input pattern of the alternating current power input with respect to each primary side coil 51-53 by controlling each switching element, respectively. In short, if the input pattern of the AC power input to each of the primary side coils 51 to 53 can be changed, the specific configuration for enabling the change is arbitrary.

  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 the parasitic capacitances of the primary side coils 22a and 22b and the secondary side coil 31.
The AC power received by the secondary coil 31 may be used for 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.
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.

  DESCRIPTION OF SYMBOLS 10 ... 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 Side coil (power transmission unit), 23a, 23b ... power transmission side controller, 24a, 24b ... power transmission side communication unit, 31 ... secondary coil, 35 ... power reception side controller, 36 ... power reception side communication unit, 50 ... second embodiment Power transmission device, 51-53 ... primary side coil of the second embodiment, 100 ... power transmission device of the third embodiment, 101 ... cable, 102 ... power transmission connector, 110 ... power reception device of the third embodiment, 111 ... power reception connector.

Claims (7)

A power transmission system including at least one power transmission device having one or more power transmission units, and including a power reception device having a power reception unit capable of receiving power from the power transmission unit,
The power transmission unit and the power reception unit are capable of power transmission when a predetermined transmission possible condition is satisfied,
The power transmission system includes:
When there are a plurality of the power transmission units, a specifying unit that identifies a target power transmission unit that satisfies the transmission enablement condition among the plurality of power transmission units,
A usage state setting unit for setting the target power transmission unit to a usage state;
A power transmission processing execution unit that executes power transmission processing for performing power transmission between the target power transmission unit and the power reception unit until a predetermined termination condition is satisfied;
A use state maintaining unit that maintains the use state even after the termination condition is satisfied;
A power transmission system comprising: The power transmission device has a primary side coil as the power transmission unit,
The power receiving device has a secondary coil as the power receiving unit,
AC power is input to the power transmission unit,
The power receiving unit can receive the AC power input to the power transmission unit in a non-contact manner by magnetic field resonance or electromagnetic induction,
The power transmission system according to claim 1, wherein the transmittable condition is that the power transmission unit and the power reception unit are arranged at a position where magnetic resonance or electromagnetic induction is possible.   The specifying unit includes a grasping unit that grasps the unused power transmission unit that is not in the used state, and when the grasping unit grasps a plurality of unused power transmission units, the plurality of unused state The power transmission system according to claim 2, wherein the target power transmission unit is specified from among power transmission units.   The identifying unit sequentially inputs the AC power to each unused power transmission unit when the grasping unit grasps a plurality of unused power transmission units, and the AC power is The power transmission system according to claim 3, wherein the target power transmission unit is specified based on a timing at which power is received by the power reception unit. The power transmission device 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 power-receiving-side communication unit transmits a predetermined response request signal,
When the power transmission device receives the response request signal in a situation where the power transmission device includes the unused power transmission unit, the power transmission side communication unit transmits a response signal including information on the unused power transmission unit to the power receiving side. 5. The transmission device according to claim 3, wherein the response signal is not transmitted when the response request signal is received in a situation where the power transmission device does not have the unused power transmission unit while transmitting to a communication unit. Power transmission system. The power transmission device has a power transmission connector provided at one end of a cable through which power is transmitted as the power transmission unit,
The power receiving device has a power receiving connector connectable with the power transmitting connector as the power receiving unit,
The power transmission system according to claim 1, wherein the transmission possible condition is that the power transmission connector and the power reception connector are connected. A power transmission device comprising one or a plurality of power transmission units and transmitting power to a power reception device having a power reception unit capable of receiving power from the power transmission unit,
The power transmission unit is capable of transmitting power to the power receiving unit when a predetermined transmittable condition is satisfied,
The power transmission device is:
When there is a target power transmission unit that is the power transmission unit that satisfies the transmittable condition, a usage state setting unit that sets the target power transmission unit to a usage state;
A power transmission process execution unit that executes a power transmission process for performing power transmission to the power receiving unit via the target power transmission unit until a predetermined termination condition is satisfied;
A use state maintaining unit that maintains the use state even after the termination condition is satisfied;
A power transmission device comprising: