Power supply system and power reception device

Abstract

To provide a power supply system and a power reception device in which wireless power supply based on a sequence that is the same as that of wired power supply is realized.SOLUTION: A power supply system includes: a power supply device that converts power to a high frequency magnetic flux and wirelessly transmits the flux through a power supply coil; a charging control device that is mounted on an electric mobility equipped with a battery and controls charging to the battery; and a power reception device that is provided with a power reception coil for receiving the high frequency magnetic flux from the power supply device and after exchanging a signal with the charging control device, outputs the power received at the power reception coil to the battery. In a case where communication connection of wireless communication for exchange of data about the battery with the power supply device is established, the power reception device starts outputting of the power from the power supply device before receiving a permission signal from the charging control device.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a power supply system and a power receiving device that realize wireless power supply based on the same sequence as wired power supply. [Background technology]

[0002] Electric mobility vehicles that use a large-capacity lithium-ion battery as a driving battery and drive a motor for traveling with the power stored in the driving battery are becoming popular. Electric mobility vehicles that use a battery as a driving energy source include not only electric vehicles, but also unmanned guided vehicles, forklifts, flying objects such as so-called drones, and water mobility vehicles such as electric propulsion ships. As a method of supplying power to the driving batteries installed in these electric mobility vehicles, a wireless power supply system that supplies power wirelessly instead of via a power cable has been put into practical use.

[0003] In a wired power supply system, the power supply device detects that a vehicle is connected by establishing electrical continuity between the signal line, communication line, and power line through a connector, and when a communication connection is established between the power supply side and the power receiving side, charging is prepared by sending and receiving signals in a predetermined sequence, and then charging begins.In contrast, in a wireless power supply system, once an agreement is reached between the power supply device and the power receiving device, power supply from the power supply coil and the start of power reception on the power receiving side are often performed automatically.

[0004] Even for wired power supply systems, technology has been proposed that can handle power supply via different communication methods (Patent Document 1), but it has been difficult to realize a vehicle that allows the selection of either wired or wireless power supply. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 2020-501479 Summary of the Invention [Problem to be solved by the invention]

[0006] Even in wired power supply, it is not easy to mount a power receiving device compatible with different types of power supply devices in a vehicle, and this is addressed by preparing different connectors or communication devices with different communication methods. Furthermore, in order to realize a power receiving device compatible with both wired power supply and wireless power supply, a predetermined procedure for sending and receiving information between the power supply device and the battery control device must be performed before charging begins in the wireless power supply as well, similar to the wired power supply.

[0007] Wireless power supply can take longer than wired power supply using insulated power lines, and various ingenuity is required to implement power supply in the same sequence as wired power supply.

[0008] An object of the present invention is to provide a power supply system and a power receiving device that realize wireless power supply based on the same sequence as wired power supply. [Means for solving the problem]

[0009] A power supply system according to one embodiment of the present disclosure includes a power supply device that converts power into high-frequency magnetic flux and transmits it wirelessly from a power supply coil, a charging control device that is mounted on an electric mobility equipped with a battery and controls charging of the battery, and a power receiving device that has a receiving coil that receives high-frequency magnetic flux from the power supply device and outputs the power received by the receiving coil to the battery after transmitting and receiving a signal with the charging control device, in which, when a wireless communication connection for transmitting and receiving data regarding the battery is established between the power receiving device and the power supply device, the power receiving device starts outputting power from the power supply device before receiving an authorization signal from the charging control device.

[0010] In the power supply system and power receiving device disclosed herein, while performing the same sequence as wired power supply, magnetic flux begins to be generated from the power supply device, and when preparation is completed in the charging control device on the vehicle side, a predetermined voltage can be applied. Effect of the Invention

[0011] According to the present disclosure, while wireless power supply requires time for a high-frequency magnetic flux to be generated from a power supply device and for a predetermined voltage to be applied to a power receiving device, it is possible to execute processing that matches a predetermined sequence for wired charging. [Brief description of the drawings]

[0012] [Figure 1] 1 is a schematic diagram of a wireless power supply system according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a schematic diagram of a switch. [Diagram 3] FIG. 2 is a block diagram showing a configuration of a power receiving device. [Figure 4] 2 is a block diagram showing a configuration of a control circuit of a power receiving device; [Diagram 5] FIG. 2 is a block diagram showing a configuration of a power supply device. [Figure 6] FIG. 4 is a sequence diagram showing an example of a charging start procedure in the wireless power supply system according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a wireless power supply system according to the present disclosure will be specifically described below with reference to the drawings.

[0014] Fig. 1 is a schematic diagram of a wireless power supply system 300 according to the present embodiment. The wireless power supply system 300 includes a power supply device 1 and a power receiving device 2. For example, as shown in Fig. 1, the power supply device 1 is installed at the back of a parking area where a vehicle V is parked. The vehicle V is an electric vehicle that runs by driving a motor with power stored in a battery 30 such as a lithium-ion battery. The vehicle V may be a so-called hybrid electric vehicle equipped with both a motor for running and an engine that generates power by burning fuel.

[0015] The power supply device 1 is connected to a power supply coil 11 installed on the ground or floor of a parking area, or a power supply coil 11 embedded under the ground or floor, and controls power supply from the power supply coil 11. The power supply coil 11 may be installed on the side of the parking area and correspond to a power receiving coil 21 provided on the side of the vehicle V.

[0016] The vehicle V is provided with a power receiving device 2 including a power receiving coil 21 that receives power supplied wirelessly from the power supply device 1. The power receiving device 2 outputs the power received by the power receiving coil 21 to a driving battery 30 mounted on the vehicle V. When supplying power to the battery 30, the power receiving device 2 sends and receives signals to and from a charge control device 3 on the vehicle V side that controls charging of the battery 30, and outputs power after confirming that charging preparations are complete.

[0017] The vehicle V has not only the power receiving device 2 for wireless power supply, but also a connector 4 for receiving power supply via a wire. The connector 4 complies with, for example, the J1772 standard of the SAE (Society of Automotive Engineers). The charging control device 3 can detect that a charging cable of a power supply facility (not shown) that performs wired power supply is connected to the connector 4. In the vehicle V, the charging control device 3 is wired so as to handle wireless power supply and wired power supply without distinction as long as they are performed in a sequence based on the same J1772 standard. For this reason, in the wireless power supply system 300 of this embodiment, when wireless power supply is performed from the power receiving device 2, a controllable switch 22 is provided so that wired power supply cannot be performed, and a processing procedure is performed so that the power receiving device 2 can charge in a sequence based on the J1772 standard.

[0018] 2 is a schematic diagram of the switch 22. The switch 22 is capable of switching whether the battery 30 receives power from the connector 4 or the power receiving device 2. The switch 22 is configured with a C-contact relay, and is connected to receive power from the connector 4 in the OFF state. The switch 22 can be switched by a control signal from the power receiving device 2 or a control signal from the charging control device 3.

[0019] 3 is a block diagram showing the configuration of the power receiving device 2. The power receiving device 2 includes a power receiving coil 21, and is a device that supplies power from the power supply device 1 to a battery 30. The power receiving device 2 includes the power receiving coil 21, a rectifying and smoothing circuit 23, a capacitor 24 (EDLC: Electric Double-Layer Capacitor, or Supercapacitor), a DC / AC converter 25, and a control circuit 20. The configuration of the power receiving device 2 is not limited to this, and it may be a configuration in which the power receiving device 2 does not include the capacitor 24 and the rectifying and smoothing circuit 23 smooths the power to a DC voltage.

[0020] The power receiving coil 21 converts the high-frequency magnetic flux emitted from the power supply device 1 into a high-frequency signal. The power receiving coil 21 is provided, for example, on the bottom of the body of the vehicle V, with its axial direction aligned along the vertical direction. In this case, the power receiving coil 21 can receive power in a state in close proximity to a power transmission coil buried in the ground or floor surface with its axis aligned in the vertical direction. The power receiving coil 21 may also be provided on the side of the body of the vehicle V, with its axial direction aligned along the horizontal direction. In this case, the power receiving coil 21 can receive power in a state in close proximity to a power supply coil 11 provided in a power transmission device that is installed upright with its axis aligned in the horizontal direction.

[0021] The rectifying and smoothing circuit 23 is a combination of a rectifying circuit that rectifies the high-frequency power signal into a direct current and a smoothing circuit that smoothes the pulsating current contained in the direct current. The rectifying and smoothing circuit 23 converts the power received by the power receiving coil 21 into a direct current and outputs it.

[0022] The capacitor 24 is a supercapacitor that utilizes an electric double layer. The capacitor 24 is connected to the output terminal of the rectifying and smoothing circuit 23. The capacitor 24 stores the power received by the power receiving coil 21 and obtained via the rectifying and smoothing circuit 23.

[0023] The DC / AC converter 25 converts DC power into AC power. The DC / AC converter 25 converts the DC power output from the rectifying and smoothing circuit 23 or the capacitor 24 into AC power compatible with the AC / DC converter of the battery 30 of the vehicle V and outputs the AC power.

[0024] The control circuit 20 controls the operation of the power receiving device 2. The control circuit 20 starts power supply from the power receiving device 2 to the battery 30 by turning on the DC / AC converter 25, and stops power supply to the battery 30 by turning off the DC / AC converter 25. The control circuit 20 can determine the charging state of the battery 30 (whether it is fully charged or not) by referring to the capacitor 24 of the power receiving device 2. Specifically, the control circuit 20 can detect the presence or absence of a charging current of the capacitor 24 by a current sensor and make the determination. The control circuit 20 executes processing for power supply to the battery 30 by sending and receiving signals to and from the charge control device 3. The control circuit 20 wirelessly communicates with the power supply device 1 that controls the power supply coil 11, and controls the start of power reception.

[0025] 4 is a block diagram showing a configuration of the control circuit 20 of the power receiving device 2. The control circuit 20 includes a processor 200 (controller), a memory 201, and a communication circuit 202. The processor 200, the memory 201, and the communication circuit 202 may be integrated on one substrate and configured as a microcontroller, or may be implemented as individual components.

[0026] The processor 200 reads out and executes a program P2 stored in the memory 201 to realize a control process described below. The processor 200 exchanges signals indicating parameters with the charging control device 3 to use them for control. The processor 200 outputs control signals to the switch 22 and the DC / AC converter 25.

[0027] A non-volatile memory is used as the memory 201. A program (program product) P2 is stored in the memory 201. The program P2 is incorporated into the memory when the power receiving device 2 is manufactured. The program P2 may be recorded on a recording medium readable by a computer (processor), read by the processor 200, and stored in the memory 201.

[0028] The communication circuit 202 realizes wireless communication with the power supply device 1. The communication circuit 202 communicates by, for example, Bluetooth (registered trademark). The standard of the wireless communication by the communication circuit 202 is not limited to Bluetooth.

[0029] 5 is a block diagram showing the configuration of the power supply device 1. The power supply device 1 is configured by connecting a control circuit 10, a rectifying and smoothing circuit 12, an inverter circuit 13, a power supply coil 11, and a detection unit 14.

[0030] The rectifying and smoothing circuit 12 rectifies and smoothes the AC power from the power source E and outputs the smoothed power. The rectifying and smoothing circuit 12 includes a filter circuit, and removes unnecessary high frequency components from the power signal and outputs the power signal.

[0031] The inverter circuit 13 includes a plurality of switching elements, and converts the power signal output from the rectifying and smoothing circuit 12 into a high-frequency signal by switching control of the switching elements from the control circuit 10.

[0032] The power supply coil 11 converts the high-frequency signal from the inverter circuit 13 into a high-frequency magnetic flux. As a result, the power supply coil 11 wirelessly transmits the high-frequency signal to the power receiving device 2 through electromagnetic induction. The power supply coil 11 is not limited to a series resonant circuit and may be a parallel resonant circuit.

[0033] The control circuit 10 is configured using a processor 100 and a memory 101. The processor 100 controls the driving of the inverter circuit 13 to switch ON / OFF of power supply to the power supply coil 11. The memory 101 stores a program (program product) P1 that defines the processing on the power supply device 1 side. The control circuit 10 includes a communication circuit 102, and realizes wireless communication with the power receiving device 2. The communication circuit 102 communicates with a communication circuit 202 of the power receiving device 2 according to the same communication standard.

[0034] The detection unit 14 uses an ultrasonic sensor, a camera, a proximity sensor, etc. to detect whether or not the vehicle V is parked in the parking area where the power supply device 1 is placed. The detection unit 14 is connected to the control circuit 10, and the processor 100 can acquire the result of the detection unit 14.

[0035] In the wireless power supply system 300 configured as above, a processing procedure for starting wireless power supply compliant with J1772, which is realized by the processing of the power supply device 1 and the power receiving device 2, will be described with reference to a sequence.

[0036] 6 is a sequence diagram showing an example of a charging start procedure in the wireless power supply system 300 in this embodiment. The power supply device 1 repeatedly executes the following process while receiving power from a power source, and the power receiving device 2 starts the process when the ignition switch is turned off.

[0037] The processor 100 determines whether or not the detection unit 14 detects that the vehicle V is parked (step S101). If it is determined that the detection unit 14 does not detect parking (S101: NO), the processor 100 returns the process to step S101 after a predetermined waiting time has elapsed.

[0038] When it is determined that parking has been detected by the detection unit 14 (S101: YES), the processor 100 attempts a communication connection with the communication circuit 202 of the power receiving device 2 by the communication circuit 102 (step S102) and determines whether communication is possible (step S103). In S103, the processor 100 may verify whether the communication partner is correct, for example, by checking the vehicle number of the vehicle V.

[0039] If it is determined that communication is not possible (S103: NO), it is determined that the vehicle is not a target for wireless power supply, and the process ends with an error.

[0040] If it is determined that communication is possible (S103: YES), the processor 100 establishes a communication connection with the communication circuit 202 through the communication circuit 102 (step S104). The processor 100 determines whether or not a notification of charging permission has been received from the power receiving device 2 (step S105).

[0041] In the power receiving device 2, the processor 200 determines whether or not communication with the power supply device 1 that performs wireless power supply via the communication circuit 202 has been established for a predetermined period after the ignition switch is turned off (step S201). In step S201, the processor 200 cooperates with the communication circuit 202 to determine whether or not the processor 200 can receive communication radio waves from the power supply device 1 and can confirm the communication partner using authentication information such as a vehicle number stored in the memory 201.

[0042] When it is determined that communication has been established (S201: YES), the processor 200 turns on the switch 22 to connect the power line between the power receiving device 2 and the battery 30 (step S202).

[0043] When the processor 200 outputs a charging preparation signal to the charging control device 3 of the vehicle V (step S203), the processor 200 notifies the power supply device 1 of charging permission via the communication circuit 202 without waiting for a response (charging permission) from the charging control device 3 to the charging preparation signal that has been output (step S204).

[0044] When the processor 200 of the power receiving device 2 receives an authorization signal from the charge control device 3 in response to the charge preparation signal output in step S203 (step S205), the processor 200 executes a predetermined sequence by sending and receiving signals conforming to the J1772 standard with the charge control device 3 (step S206). The processor 200 determines whether the power received from the power receiving coil 21 can be output at a predetermined voltage value within a predetermined time (step S207).

[0045] When the processor 200 determines that the power can be output (S207: YES), charging of the battery 30 is executed under the control of the charge control device 3 thereafter.

[0046] In step S204, permission to charge is notified in advance to the power supply device 1. As a result, while a predetermined sequence is being executed in step S206, the power supply device 1 is preparing to supply power, and at the timing of confirmation in step S207, a predetermined voltage is applied to the DC / AC converter 25 of the power receiving device 2, making it possible to immediately supply power.

[0047] If it is determined in step S207 that power could not be output at the predetermined voltage value within the predetermined time (S207: NO), the processor 200 returns the process to step S203 and makes several attempts. At this time, the processor 200 makes the attempt after resetting the measurement of time, etc. If the processor 200 determines that power could not be output at the predetermined voltage value within the predetermined time even after several attempts to start charging, it is preferable to cut off the communication connection and end the process with an error.

[0048] In step S201, if it is determined that communication has not been established (S201: NO), it is determined that the parking location is not a parking area where wireless power supply is possible, and the process ends. In this case, power is not supplied from the power supply device 1, and wireless power supply via the power receiving device 2 is not performed. During this time, the charging control device 3 may start charging via a wired connection, and the switch 22 connects between the connector 4 and the battery 30.

[0049] When the processor 100 in the power supply device 1 determines in step S105 that the notification of charging permission has been given (S105: YES), the processor 100 outputs a signal to drive the inverter circuit 13 (step S106) and starts the power supply from the power supply coil 11 (step S107). This ends the start process and starts charging.

[0050] When the processor 100 determines in step S105 that the charging permission is not notified (S105: NO), the processor 100 returns the process to step S105 and waits until the charging permission notification is received. When the waiting time reaches or exceeds a predetermined waiting upper limit time, the processor 100 ends the process with an error.

[0051] Conventionally, in step S203, the power supply device 1 is notified of charging permission after waiting for a response (charging permission) from the charging control device 3. In this case, if power is not applied to the battery 30 at a predetermined voltage value within a predetermined time after charging permission is given from the charging control device 3, the charging control device 3 determines that charging is not possible and an error occurs and charging does not start. In contrast, by notifying the power supply device 1 of charging permission without waiting for a response in step S203, the power supply device 1 can start outputting magnetic flux sooner, and the power receiving device 2 can output power at a predetermined voltage value with the same responsiveness as wired power supply via the connector 4.

[0052] In this manner, a vehicle V equipped with a battery 30 that can be charged by either wireless power supply or wired power supply can be realized by using a configuration including the switch 22 and the processing procedures shown in the flowcharts of FIGS.

[0053] In the present embodiment, the power supply target has been described by taking as an example a battery 30 mounted on a vehicle V. However, the wireless power supply system 300 of the present disclosure is not limited to the vehicle V, and may be applied to electric mobility equipped with a storage battery such as a ship or a drone, or may be applied to electronic devices other than mobility.

[0054] The embodiments disclosed above are illustrative in all respects and are not restrictive. The scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0055] 1 Power supply device 10 Control circuit 100 processors 102 Communication Circuit 11 Power coil 14 Detection unit 2 Power receiving device 20 Control circuit 200 processors 202 Communication Circuit 21 Receiving coil 22 Switch 300 Wireless Power Supply System 30 Battery 3. Charging control device 4 Connector V Vehicle (Electric Vehicle)

Claims

1. A wireless power supply system including a power supply device that converts power into high-frequency magnetic flux and wirelessly transmits the converted power from a power supply coil, a charge control device that is mounted on an electric mobility equipped with a battery and controls charging of the battery, and a power receiving device that includes a power receiving coil that receives the high-frequency magnetic flux from the power supply device and outputs the power received by the power receiving coil to the battery after transmitting and receiving a signal to and from the charge control device, The power receiving device is When a wireless communication connection for transmitting and receiving data related to the battery is established between the power supply device and the battery, the power supply device starts outputting electric power before receiving an authorization signal from the charging control device. Power supply system.

2. The power supply device starts outputting power from the power supply coil when a wireless communication connection for transmitting and receiving data related to the battery is established between the power supply device and the power receiving device. The power supply system according to claim 1 .

3. When a wireless communication connection for transmitting and receiving data related to the battery is established between the power supply device and the power receiving device and an output start instruction is received from the power receiving device, the power supply device starts outputting power from the power supply coil. The power supply system according to claim 1 .

4. The electric mobility is a wired connector for a power line that supplies power to the battery; a switch for switching between connecting the wired connector to the battery and supplying the power output from the power receiving device to the battery; having When a wireless communication connection for transmitting and receiving data related to the battery is established between the power receiving device and the power supply device, the power receiving device switches the switch so as to supply the power output from the power receiving device to the battery. The power supply system according to claim 1 .

5. The wired connector is a connector conforming to the J1772 standard, When the power receiving device receives an authorization signal from the charging control device according to a sequence based on the J1772 standard, the power receiving device outputs the power supplied from the power supply device to the battery. The power supply system according to claim 4 .

6. A power receiving device is mounted on an electric mobility equipped with a battery, and transmits and receives signals with a charge control device that controls charging of the battery, and supplies power received by a power receiving coil from a power feeding coil to the battery, When a wireless communication connection for transmitting and receiving data related to the battery is established between the battery and a power supply device that controls a power supply coil, the power supply device starts outputting electric power before receiving an authorization signal from the charging control device. Powered device.

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