JP2020162310A - Non-contact power supply system, power transmission device and power reception device - Google Patents

Abstract

To provide means for confirming whether a power reception device of non-contact power supply is at a position where power can be received from a power transmission device without requiring a labor of a user.SOLUTION: A non-contact power supply system 1 comprises: a power transmission device 11 which performs non-contact power supply; and a power reception device 12 which receives power supply from the power transmission device 11. The power transmission device 11 performs test power supply, and the power reception device 12 wirelessly transmits power reception notification when the test power supply is received from the power transmission device 11. The power transmission device 11 starts main power supply when the power reception notification is received. In addition, the power transmission device 11 wirelessly transmits advance notification before performing the test power supply, and the power reception device 12 prepares for power reception of the test power supply when the advance notification is received.SELECTED DRAWING: Figure 4

Description

The present invention relates to a non-contact power feeding system, a power transmitting device and a power receiving device.

In recent years, electric vehicles have become widespread. Some electric vehicles are equipped with a secondary battery and run by driving a motor with the electric power stored in the secondary battery. As a method of charging the secondary battery mounted on such an electric vehicle, there is a non-contact power supply method. When the secondary battery is charged by non-contact power supply, it is not necessary to attach / detach the power supply line to / from the vehicle, which is highly convenient for the user.

In the non-contact power transmission, the power transmission device (that is, the device of the power supply source) needs to confirm that the power receiving device (that is, the device of the power supply destination) exists at a position where it can receive power when transmitting power. As a method for the power transmission device to confirm that the power receiving device is in a position where it can receive power, conventionally, a vehicle equipped with the power receiving device (that is, an electric vehicle) can receive power by using an image taken by an optical sensor or a camera. A method of determining whether or not it is present has been proposed.

For example, in Patent Document 1, a reflector is attached at a predetermined position of a vehicle, and when the vehicle is parked in a power feeding position, a throwing / receiving device is installed at a position facing the reflecting plate, and the throwing / receiving receiver emits light. A mechanism for determining whether or not the vehicle is parked in the power feeding position is described by measuring the reflected light of the light.

Japanese Unexamined Patent Publication No. 2014-79029

According to the invention described in Patent Document 1, if the reflector attached to the vehicle or the throwing / receiving device installed in the power feeding facility such as a parking lot becomes dirty, it is determined whether or not the vehicle is parked in the power feeding position. Not done correctly. Therefore, it is necessary for the user of the vehicle to clean the reflector and the manager of the power supply facility to clean the throwing / receiving receiver, which requires time and effort for maintenance.

The present invention provides a means for confirming whether or not a power receiving device for non-contact power supply is in a position where power can be received from the power transmission device without requiring the user's trouble.

In order to solve the above-mentioned problems, the present invention is a non-contact power transmission system including a power transmission device that performs non-contact power supply and a power receiving device that receives power from the power transmission device, and the power transmission device performs test power supply. When the power receiving device receives a test power supply from the power transmission device, the power receiving device wirelessly transmits a power receiving notification, and when the power transmitting device receives the power receiving notification, a non-contact power feeding system that starts the main power supply is used as the first aspect. provide.

According to the non-contact power feeding system of the first aspect, it is possible to confirm whether or not the power receiving device is in a position where power can be received from the power transmission device without requiring the user's trouble.

In the non-contact power supply system of the first aspect, the power transmission device wirelessly transmits a notice of the test power supply before performing the test power supply, and when the power receiving device receives the notice of the test power supply, the power receiving device prepares for receiving power. May be adopted as the second aspect.

According to the non-contact power supply system of the second aspect, the power receiving device does not need to be constantly provided for receiving the test power supply.

In the non-contact power supply system of the second aspect, when the power transmission device wirelessly receives a notice of test power supply from a power transmission device of the same type as its own device, the power transmission device is determined by a predetermined rule based on the reception timing of the notice notice. A configuration in which a notice of test power supply performed by the own device is wirelessly transmitted may be adopted as the third aspect.

According to the non-contact power feeding system of the third aspect, it is possible to prevent the notice notifications from the plurality of power transmission devices from being transmitted at the same timing and the power receiving devices from being unable to receive the notices.

In the non-contact power feeding system of the first or second aspect, the power transmission device performs a test power supply for a time length different from that of other similar power transmission devices, and when the power receiving device receives a test power supply, the test is performed. A configuration in which a power reception notification indicating the length of power supply is transmitted wirelessly may be adopted as the fourth aspect.

According to the non-contact power supply system of the fourth aspect, in the power transmission device, whether or not to perform the main power supply depends on whether or not the power reception notification indicating the length of time that the own device has performed the test power supply after the test power supply is received. Can be judged.

In the non-contact power supply system of the first or second aspect, the power transmission device performs test power supply by electromagnetic waves modulated with identification information of its own device, and when the power receiving device receives test power supply, the test power supply is performed. A configuration in which a power reception notification indicating the identification information of the power transmission device demodulated from the electromagnetic waves used may be transmitted wirelessly may be adopted as the fifth aspect.

According to the non-contact power supply system of the fifth aspect, it is possible to determine whether or not to perform the main power supply depending on whether or not the power transmission device receives the power reception notification indicating the identification information of the own device after the test power supply. Become.

In the non-contact power supply system of the first to fifth aspects, the power receiving device wirelessly transmits at least one of the remaining charge of the battery of the own device, the type of the battery, and the identification information of the own device. The configuration of doing so may be adopted as the sixth aspect.

According to the non-contact power supply system of the sixth aspect, it is possible to perform appropriate power supply in the power transmission device according to the information from the power receiving device.

Further, the present invention is a power transmission device that performs non-contact power supply to a power receiving device, and when a test power supply is performed and a power receiving notification indicating that the test power supply has been received is wirelessly received from the power receiving device, the main power supply is performed. The power transmission device to be started is provided as a seventh aspect.

According to the power transmission device of the seventh aspect, it is possible to confirm whether or not the power receiving device is in a position where power can be received from the power transmission device without requiring the user's trouble.

Further, the present invention is a power receiving device that receives non-contact power supply from a power transmission device, and when a test power supply is received from the power transmission device, the power receiving device wirelessly transmits a power receiving notification indicating that the test power supply has been received. It is provided as the aspect of 8.

According to the power receiving device of the eighth aspect, the power transmission device can confirm whether or not the power receiving device is in a position where power can be received from the power transmission device without requiring the user's trouble.

A plan view of a parking lot in which a non-contact power supply system according to an embodiment is installed. The block diagram which shows the structure of the power transmission apparatus which concerns on one Embodiment. A block diagram showing a configuration of a power receiving device according to an embodiment and a main power-related device included in a vehicle. The figure which showed the state which the non-contact power supply is performed from the power transmission device which concerns on one Embodiment to a power receiving device. The sequence diagram which showed the operation performed by the non-contact power supply system which concerns on one Embodiment.

[Embodiment]
Hereinafter, the non-contact power supply system 1 according to the embodiment of the present invention will be described. FIG. 1 is a plan view of the parking lot P in which the non-contact power supply system 1 is installed.

The parking lot P is provided with vehicle compartments S1 to S4. Hereinafter, when the passenger compartments S1 to S4 are not distinguished, they are collectively referred to as "vehicle compartment S". In the present embodiment, it is assumed that the parking lot P is provided with four vehicle compartments, but the number of vehicle compartments provided in the parking lot P may be 3 or less or 5 or more.

The non-contact power supply system 1 includes power transmission devices 11-1 to 11-4 arranged in each of the vehicle compartments S1 to S4, and a power reception device mounted on the vehicle. FIG. 1 illustrates a state in which two vehicles, that is, vehicles 2-1 and 2-2, have entered the parking lot P. Hereinafter, when vehicles 2-1 and 2-2 are not distinguished, they are collectively referred to as "vehicle 2". Vehicles 2-1 and 2-2 are equipped with power receiving devices 12-1 and 12-2, respectively. Hereinafter, when the power receiving devices 12-1 and 12-2 are not distinguished, they are referred to as "power receiving device 12".

The power transmission device 11 provides non-contact power supply, and the power receiving device 12 can receive non-contact power supply from the power transmission device 11. In the present embodiment, the non-contact power supply performed from the power transmission device 11 to the power receiving device 12 follows, for example, an electromagnetic induction method, but other methods such as a magnetic resonance method and a microwave discharge method may be adopted. ..

FIG. 2 is a block diagram showing the configuration of the power transmission device 11. The power transmission device 11 includes a power transmission coil 111, a control unit 112, a power conversion unit 113, and a wireless communication unit 114. The power transmission device 11 operates by receiving the supply of AC power from the AC power source 30.

The power transmission coil 111 is installed on the ground of the passenger compartment S. In FIG. 1, the power transmission coil 111 is circled near the center of the passenger compartments S1 to S4. The control unit 112, the power conversion unit 113, and the wireless communication unit 114 are housed in, for example, one housing, and are arranged at positions that do not interfere with the parking of the vehicle 2. Hereinafter, the control unit 112, the power conversion unit 113, and the wireless communication unit 114 housed in one housing are referred to as "the main body of the power transmission device 11" for convenience. In FIG. 1, the main body of the power transmission device 11 is shown by a square on the back side of the vehicle compartments S1 to S4.

The power conversion unit 113 converts the AC power supplied from the AC power supply 30 into high-frequency AC power and supplies it to the power transmission coil 111.

The power transmission coil 111 generates electromagnetic waves by high-frequency AC power supplied from the power conversion unit 113.

The control unit 112 is composed of a microcomputer and controls the operations of the power conversion unit 113 and the wireless communication unit 114.

The wireless communication unit 114 performs wireless communication with the wireless communication unit 124 of the power receiving device 12, which will be described later. In the present embodiment, the wireless communication unit 114 and the wireless communication unit 124 perform wireless communication in accordance with BLE (Bluetooth (registered trademark) Low Energy), but a wireless communication protocol other than BLE may be used.

FIG. 3 is a block diagram showing a configuration of a main power-related device included in the power receiving device 12 and the vehicle 2. The power receiving device 12 includes a power receiving coil 121, a control unit 122, a charging unit 123, and a wireless communication unit 124.

The power receiving coil 121 is installed on the lower surface of the chassis of the vehicle 2. When the vehicle 2 is parked at a predetermined position in any of the vehicle compartments S, the power receiving coil 121 is at a position facing the power transmission coil 111 of the power transmission device 11 (hereinafter, this position is referred to as a “power receiving position”). The power receiving coil 121 receives an electromagnetic wave generated by the power transmitting coil 111 at the power receiving position to generate high-frequency AC power.

The control unit 122 is composed of a microcomputer and controls the charging unit 123 and the wireless communication unit 124. The charging unit 123 converts the high-frequency AC power generated by the power receiving coil 121 into DC power and supplies it to the battery 41. The wireless communication unit 124 performs wireless communication with the wireless communication unit 114 of the power transmission device 11.

The battery 41 is a secondary battery and serves as a power source for supplying electric power for operating the vehicle 2. The inverter 42 converts the DC power supplied from the battery 41 into AC power and supplies it to the motor 43. The motor 43 is operated by AC power supplied from the inverter 42 to drive the vehicle 2.

FIG. 4 is a diagram showing a state in which the vehicle 2 is parked at a position where the power receiving coil 121 is in the power receiving position, and non-contact power is being supplied from the power transmitting device 11 to the power receiving device 12.

In order to perform non-contact power supply, as shown in FIG. 4, the power receiving coil 121 provided in the vehicle 2 needs to be located directly above the power transmission coil 111 installed in the vehicle interior S. In this state, high-frequency AC power is supplied from the main body of the power transmission device 11 to the power transmission coil 111, and this AC power is transmitted to the power receiving coil 121 in a non-contact manner by electromagnetic induction action. The AC power transmitted to the power receiving coil 121 is converted into DC power by the main body of the power receiving device 12 and stored in the battery 41.

In the present embodiment, the power supply performed from the power transmission device 11 to the power receiving device 12 is classified into two types, a test power supply and a main power supply. This power supply is a power supply for supplying electric power for charging the battery 41 from the power transmission device 11 to the power receiving device 12. On the other hand, the test power supply is a power supply for confirming whether or not the power receiving coil 121 is in the power receiving position before starting the main power supply.

The size of the output of the test power supply may be any size as long as it can be determined whether or not the power receiving device 12 has received the test power supply. Therefore, the size of the output of the test power supply does not necessarily have to match the size of the output of the main power supply, and for example, the output of the test power supply may be smaller than the output of the main power supply.

Further, in the present embodiment, the notice notification and the power reception notification are communicated between the power transmission device 11 and the power reception device 12. The notice notice is a notice for notifying that the power transmission device 11 will perform test power supply to the power receiving device 12. The power receiving notification is a notification that the power receiving device 12 has received a test power supply from the power receiving device 12 to the power transmitting device 11.

In the present embodiment, the power transmission device 11 transmits a test power supply after transmitting the notice. When the power receiving device 12 receives the advance notice, it waits for receiving the test power supply, and if it is determined that the test power supply has been received before the elapse of the predetermined time, the power receiving device 12 transmits the power receiving notification to the power transmission device 11. When the power transmission device 11 receives the power reception notification from any of the power reception devices 12, the power transmission device 11 starts the main power supply. The power receiving device 12 detects the magnitude of the power supplied from the power receiving coil 121 to the charging unit 123 by, for example, the control unit 122, and whether the detected power magnitude is within a predetermined range according to the test power supply. Determine whether or not the test power supply was received based on whether or not.

Further, in the present embodiment, the plurality of power transmission devices 11 do not perform test power supply at the same time. Therefore, even if the vehicles 2 are parked in the plurality of vehicle compartments S, the test power supply is not performed to the vehicles 2 at the same time, and the two or more power receiving devices 12 do not transmit the power receiving notification at the same time. Therefore, the power transmission device 11 can always correctly determine whether or not there is a power receiving device 12 provided for power supply on the own device.

In the present embodiment, when a notice notification is received from another power transmission device 11, each of the power transmission devices 11 is determined based on the reception timing of the notice notice so that the plurality of power transmission devices 11 do not perform test power supply at the same time. Sends a notice of test power supply performed by the own device at the timing determined by the rules.

Specifically, for example, the power transmission device 11-2 transmits a notice notification at a timing when a predetermined time has elapsed after receiving the notice notification transmitted by the power transmission device 11-1, and the power transmission device 11-3 transmits the power transmission device 11-2. The power transmission device 11-4 transmits the power transmission device 11-4 at the timing when the predetermined time elapses after receiving the notice notification sent by the power transmission device 11-3. The power transmission device 11-1 transmits the power transmission device 11-1 and transmits the power transmission device 11-1 at a timing when a predetermined time has elapsed after receiving the power transmission device 11-4. As a result, the power transmission devices 11-1 to 11-4 cyclically sequentially perform test power supply at intervals of a predetermined time.

The above-mentioned predetermined time is, for example, a time obtained by adding a time for giving a margin to the time normally required from the transmission timing of the notice notification by the power transmission device 11 to the transmission timing of the power reception notification by the power reception device 12.

FIG. 5 is a sequence diagram showing an operation performed by the non-contact power supply system 1 when non-contact power supply is performed from the power transmission device 11 to the power receiving device 12. In the sequence diagram of FIG. 5, as an example, the vehicle 2-1 is parked in the passenger compartment S1, the vehicle 2-2 is parked in the passenger compartment S4, and both of the power receiving devices 12 of the vehicles 2 can receive power. The sequence of operations performed by the power transmitting device 11-1, the power receiving device 12-1, and the power receiving device 12-2 is shown in 1. The situation in which the power receiving device 12 can receive power is, for example, that the motor 43 is not operating, the ratio of the remaining storage capacity to the storage capacity of the battery 41 is equal to or less than a predetermined threshold value, and the power receiving device 12 is not receiving power. The situation.

The power transmission device 11-1 broadcasts the notice notice when a predetermined time has elapsed from the reception of the notice notice broadcast by the power transmission device 11-4 (step S501). The advance notice transmitted in step S501 includes identification information of the power transmission device 11-1 (hereinafter, referred to as “power transmission device ID-1”). In this case, the notice is received by each of the power receiving device 12-1 and the power receiving device 12-2.

Upon receiving the notice notification, the power receiving device 12-1 broadcasts the response notification (step S502). The response notification transmitted in step S502 includes the power transmission device ID-1.

Upon receiving the notice notification, the power receiving device 12-2 broadcasts the response notification (step S503). The response notification transmitted in step S503 includes the power transmission device ID-1.

After transmitting the response notification, the power receiving device 12-1 prepares for receiving the test power supply (step S504). Similarly, the power receiving device 12-2 prepares for receiving the test power supply after transmitting the response notification (step S505).

When the power transmission device 11-1 receives the response notification transmitted from each of the power receiving devices 12-1 and 12-2, the power transmission device 11-1 confirms that the power transmission device ID-1 is included in the response notification, and then supplies a test power supply. (Step S506). If there is no vehicle 2 capable of receiving power in the parking lot P, the power transmission device 11-1 does not receive the response notification within a predetermined time after transmitting the notice notification in step S501. In that case, the processing after step S506 shown in FIG. 5 is not performed.

In this case, the test power supply performed by the power transmission device 11-1 in step S506 is received by the power receiving device 12-1. When the power receiving device 12-1 receives the test power supply, the power receiving device 12-1 broadcasts the power receiving notification (step S507). The power receiving notification transmitted in step S507 includes the power transmitting device ID-1 and the identification information of the power receiving device 12-1 (hereinafter, referred to as “power receiving device ID-1”).

After transmitting the power receiving notification, the power receiving device 12-1 attempts to establish a communication connection with the power transmission device 11-1 identified by the power transmission device ID-1 (step S508).

When the power transmission device 11-1 receives the power reception notification transmitted from the power reception device 12-1, the power transmission device 11-1 confirms that the power reception device ID-1 is included in the power reception notification, and then the power reception device ID- included in the power reception notification. Attempts to establish a communication connection with the power receiving device 12-1 identified by 1 (step S509).

When a communication connection is established between the power transmitting device 11-1 and the power receiving device 12-1 by the attempt of steps S508 and S509, the power receiving device 12-1 transmits the status data indicating the status of the own device to the power transmitting device 11-1. (Step S510). In the present embodiment, the status data indicates, for example, the remaining charge of the battery 41 included in the vehicle 2-1 and the charge capacity of the battery 41 and the type of the battery 41. After transmitting the status data, the power receiving device 12-1 prepares for the main power supply (step S511).

When the power transmission device 11-1 receives the status data transmitted from the power reception device 12-1, the power transmission device 11-1 determines the parameters of the main power supply based on the storage capacity of the battery 41 indicated by the status data (step S512). In the present embodiment, the parameters of the main power supply are, for example, the level of the power output determined according to the type of the battery 41 and the scheduled time of the power supply determined according to the storage capacity and the remaining amount of the battery 41. .. The scheduled power supply time is, for example, the time required for the battery 41 to be fully charged.

The power transmission device 11-1 performs the main power supply according to the parameters determined in step S512 (step S513). The power receiving device 12-1 receives the main power supply and charges the battery 41 (step S514).

The main power supply in step S513 and the power reception and charging in step S514 are terminated, for example, when the scheduled time for power supply determined in step S512 elapses or when the vehicle 2-1 exits the passenger compartment S1. When the vehicle 2-1 exits the passenger compartment S1, the motor 43 of the vehicle 2-1 drives. When the power receiving device 12-1 detects the start of operation of the motor 43 during power receiving, the power receiving device 12-1 stops receiving power and transmits a stop notification to the power transmission device 11-1. When the power transmission device 11-1 receives the stop notification, the power transmission device 11-1 stops the power supply.

The power transmission device 11-1 does not transmit the notice of step S501 even if the turn comes around, while the power is being supplied to the power receiving device 12-1. In this case, since the power transmission device 11-2 does not receive the notice notification from the power transmission device 11-1, the power transmission device 11-4 or the power transmission device 11-3 transmits the notice notice of its own device from the reception timing of the notice notice. Determine the timing.

Further, while the power receiving device 12-1 receives the main power supply from the power transmission device 11-1, the response notification in step S502 is transmitted even if the notice notification transmitted from any of the power transmission devices 11 is received. Not performed.

According to the non-contact power supply system 1 described above, the battery 41 of the vehicle 2 parked in the vehicle compartment S is charged without any operation by the user.

[Modification example]
The above embodiments can be modified in various ways. An example of these modifications is shown below. In addition, two or more modified examples shown below may be combined as appropriate.

(1) In the above-described embodiment, the plurality of power transmission devices 11 sequentially perform test power supply in a time-division manner, and do not perform test power supply at the same time. Instead of this, a configuration may be adopted in which a plurality of power transmission devices 11 simultaneously perform test power supply.

In this modification, for example, the plurality of power transmission devices 11 perform test power supply for different time lengths. The power receiving device 12 measures the time length of receiving the test power supply, and broadcasts a power receiving notification indicating the measured time length. Even if each of the plurality of power transmission devices 11 receives power reception notifications from each of the plurality of power reception devices 12 at the same time, is the power reception notification corresponding to the test power supply performed by the own device according to the time length indicated by the power reception notifications? It can be determined whether or not.

Further, instead of the method of making the time length of the test power supply different, the power transmission device 11 performs the test power supply using the electromagnetic wave modulated with the identification information (power transmission device ID) of the own device, and the power receiving device 12 receives the power for the test power supply. The power transmission device ID may be demodulated from the used electromagnetic waves, and the power transmission device 11 that has performed test power supply to the own device may be identified by the power transmission device ID. In this case, the power receiving device 12 transmits a power receiving notification indicating the power transmission device ID demodulated from the electromagnetic wave.

(2) In the above-described embodiment, the power transmission device 11 transmits a notice of notice every predetermined time regardless of whether or not the vehicle 2 is parked in the parking lot P. Instead, the non-contact power supply system 1 includes a detection device for detecting the vehicle 2 entering and exiting the parking lot P, and the power transmission device 11 bases the vehicle 2 in the parking lot P based on the detection result by the detection device. A configuration in which a notice of notice is transmitted may be adopted only when there is (for example, excluding those during or at the end of power supply). According to this modification, useless broadcast transmission is reduced.

For example, when the entrance / exit of the vehicle 2 is restricted by the gate installed at the entrance / exit of the parking lot P, the power transmission device 11 broadcasts the notice notification only when one of the vehicles 2 is in the parking lot P. The configuration performed may be adopted.

Further, for example, when a camera for taking an image for recognizing the vehicle number of the parked vehicle 2 is arranged in each of the plurality of vehicle compartments S, the vehicle 2 is recognized from the image taken by the camera. A configuration may be adopted in which the power transmission device 11 installed in the passenger compartment S broadcasts the notice notice only while the vehicle is open.

(3) In the above-described embodiment, at least a part of the communication that the power transmitting device 11 or the power receiving device 12 is supposed to broadcast may be performed via a communication connection instead of the broadcast transmission. For example, the power receiving device 12 includes the power receiving device ID of its own device in the response notification, and the communication connection is established between the power transmitting device 11 that received the response notification and the power receiving device 12 that is the source of the response notification. You may. In this case, the power receiving device 12 can transmit the power receiving notification via the communication connection established with the power transmission device 11 instead of broadcasting.

(4) The information indicated by the status data transmitted by the power receiving device 12 to the power transmitting device 11 is not limited to that of the above-described embodiment. For example, the storage capacity of the battery 41 and the type of the battery 41 may be identifiable by the vehicle type or vehicle number of the vehicle 2. In that case, the power receiving device 12 transmits status data indicating the type (vehicle type) or vehicle number of the vehicle 2 instead of the storage capacity of the battery 41 and the type of the battery 41. The power transmission device 11 stores data indicating the storage capacity and type of the battery 41 according to various vehicle types or vehicle numbers, and stores the battery 41 according to the vehicle type or vehicle number indicated by the status data transmitted from the power receiving device 12. The capacity and type are specified and used to determine the parameters of this power supply.

(5) In the above-described embodiment, the sequence shown in FIG. 5 is an example and may be changed as appropriate. For example, the timing at which the power receiving device 12 transmits the status data to the power transmission device 11 may be the timing at which the response notification is transmitted in response to the notice notification.

(6) In the above-described embodiment, the power receiving device 12 that has not received the test power supply does not transmit any notification, but receives the test power supply before the predetermined time elapses after receiving the notice notification. The power receiving device 12 that did not receive the test power may transmit a non-power receiving notification indicating that the test power supply was not received.

(7) In the above-described embodiment, a predetermined time elapses after the other power transmission device 11 receives the notice notification transmitted by one power transmission device 11 so that the plurality of power transmission devices 11 do not perform test power supply at the same time. After that, the next power transmission device 11 transmits a notice notice, which is a method adopted. Instead of this, a configuration may be adopted in which a plurality of power transmission devices 11 are provided with clocks whose times are synchronized, and notice notifications are transmitted at different times from each other.

(8) Sending and receiving notice and response notifications in the above-described embodiment is not essential. If the power receiving device 12 can always receive the test power supply, the power transmission device 11 can perform the test power supply without transmitting the notice.

(9) In the above-described embodiment, the trigger for the power transmission device 11 to perform test power supply is the reception of the response notification from the power receiving device 12, but the trigger for the power transmission device 11 to perform test power supply is limited to this. Absent. For example, the test power supply may be performed by triggering that the power transmission device 11 establishes a communication connection with any of the power receiving devices 12.

(10) In the above-described embodiment, the power transmission device 11 uses the time required for the battery 41 to be fully charged as the scheduled time for the main power supply. The scheduled time for this power supply is not limited to the time required for the battery 41 to be fully charged. For example, the scheduled time for power supply may be determined according to the number of vehicles 2 capable of supplying power in the parking lot P. Further, when the time required for the battery 41 to be fully charged exceeds the threshold time, the threshold time may be set as the scheduled power supply time.

1 ... non-contact power supply system, 2 ... vehicle, 11 ... power transmission device, 12 ... power receiving device, 30 ... AC power supply, 41 ... battery, 42 ... inverter, 43 ... motor, 111 ... power transmission coil, 112 ... control unit, 113 ... Power conversion unit, 114 ... wireless communication unit, 121 ... power receiving coil, 122 ... control unit, 123 ... charging unit, 124 ... wireless communication unit.

Claims (8)

A non-contact power transmission system including a power transmission device that performs non-contact power supply and a power reception device that receives power from the power transmission device. The power transmission device performs test power supply, and the power reception device receives test power supply from the power transmission device. In this case, a non-contact power supply system that wirelessly transmits a power reception notification and starts the main power supply when the power transmission device receives the power reception notification. The non-contact power supply system according to claim 1, wherein the power transmission device wirelessly transmits a notice of the test power supply before performing the test power supply, and when the power receiving device receives the notice of the test power supply, prepares for receiving the power. When the power transmission device wirelessly receives a test power supply notice from a power transmission device of the same type as the own device, the power transmission device wirelessly notifies the test power supply notice that the own device performs at a timing determined by a predetermined rule based on the reception timing of the notice. The non-contact power supply system according to claim 2, which is transmitted by. The power transmission device performs a test power supply with a time length different from that of other similar power transmission devices, and when the power receiving device receives the test power supply, the power receiving device wirelessly transmits a power receiving notification indicating the time length of the test power supply. Item 2. The non-contact power transmission system according to item 1 or 2. The power transmission device performs test power supply using an electromagnetic wave that modulates the identification information of its own device, and when the power receiving device receives test power supply, the power receiving device indicates identification information of the power transmission device demodulated from the electromagnetic wave used for the test power supply. The non-contact power supply system according to claim 1 or 2, which wirelessly transmits a power reception notification. The power receiving device according to any one of claims 1 to 5, which wirelessly transmits at least one of the remaining charge of the battery of the own device, the type of the battery, and the identification information of the own device. Contactless power supply system. A power transmission device that performs non-contact power supply to a power receiving device, performs test power supply, and starts main power transmission when a power receiving notification indicating that the test power supply has been received is wirelessly received from the power receiving device. A power receiving device that receives non-contact power supply from a power transmission device, and when a test power supply is received from the power transmission device, a power receiving device that wirelessly transmits a power receiving notification indicating that the test power supply has been received.

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