JP2023134318A - Charge/discharge device and charge/discharge control method - Google Patents

Abstract

To provide a charge/discharge device capable of performing charging/discharging of various vehicles as an object, and a charge/discharge control method.SOLUTION: A charge/discharge device is connected to a storage battery serving as a DC power supply provided in a vehicle and configured to control charge/discharge between the storage battery and an AC power supply or a load, and includes: a power converter configured to switchably perform any one of conversion of an AC voltage to a DC voltage, conversion of a DC voltage to an AC voltage, and conversion of a DC voltage to a DC voltage; a switch circuit that switches ON/OFF of transmission and reception of electric power between a DC side of the power converter and the storage battery; and a control unit that controls ON/OFF of the switch circuit. The control unit increases a voltage on the DC side of the power converter to a predetermined value using a power supply other than the storage battery before turning ON the switch circuit.SELECTED DRAWING: Figure 2

Description

The present invention relates to a charging/discharging device and a charging/discharging control method for controlling charging/discharging of a storage battery installed in a vehicle.

The storage battery installed in an electric vehicle has a relatively large capacity. Techniques have been proposed to realize V2H (Vehicle to Home), which enables the power stored in these vehicles to be supplied to, for example, household loads in addition to driving electric vehicles. Technologies to realize V2X have been proposed, including not only V2H but also V2B (vehicle to building), which enables power supply to larger buildings, and V2G (vehicle to grid), which enables power supply to the power grid. There is. With these technologies, it is expected that even in the event of a power outage due to a disaster, it will be possible to supply electric power stored in mobile electric vehicles to maintain daily life and keep factories operating.

In order to promote the spread of electric vehicles while realizing V2X using storage batteries installed in electric vehicles as a power source, electric vehicle owners and dealers must not only prepare charging and discharging devices exclusively for electric vehicles, but also A full range of general-purpose charging stations is required. Such a widely used general-purpose charging station requires a charging/discharging device that can charge/discharge a variety of vehicles.

Control of charging an electric vehicle and discharging from an electric vehicle is performed according to certain standards such as CHAdeMO (registered trademark), but the behavior differs slightly depending on the vehicle manufacturer and vehicle model. Therefore, in charging/discharging devices used for general purposes, charging/discharging control is performed depending on the vehicle type (see Patent Document 1, etc.).

Patent No. 6737390

It is desirable that a single charging/discharging device used for general purpose be capable of discharging from an electric vehicle and charging a wide variety of electric vehicles, including charging-only vehicles (non-discharging vehicles).

An object of the present invention is to provide a charging/discharging device and a charging/discharging control method that can charge/discharge a variety of vehicles.

A charging/discharging device according to an embodiment of the present disclosure is a charging/discharging device that is connected to a storage battery that serves as a DC power source provided in a vehicle, and controls charging and discharging between the storage battery and a power source or a load, A power converter that converts voltage to DC voltage, converts DC voltage to AC voltage, and converts DC voltage to DC voltage in a switchable manner; and a DC side of the power converter; , a switch circuit that switches ON and OFF of power transfer to and from the storage battery, and a control unit that controls ON and OFF of the switch circuit, and the control unit includes a switch circuit that switches ON and OFF of power transfer to and from the storage battery; First, the voltage on the DC side of the power converter is increased to a predetermined value using a power source other than the storage battery.

A charging and discharging control method according to an embodiment of the present disclosure is a charging and discharging device that is connected to a storage battery that serves as a DC power source provided in a vehicle and controls charging and discharging between the storage battery and a power source or a load, comprising: A DC power converter that, when connected to a vehicle, converts AC voltage to DC voltage, converts DC voltage to AC voltage, and converts DC voltage to DC voltage in a switchable manner. The voltage on the DC side is increased to a predetermined upper limit using a power source other than the storage battery of the vehicle, and after the voltage on the DC side reaches the predetermined value, the voltage on the DC side of the power converter and the storage battery is increased. A switch circuit that switches on and off the transfer of power between the two is turned on.

The charging/discharging device and the charging/discharging control method of the present disclosure convert AC voltage to DC voltage so that one device can perform both charging and discharging of a storage battery included in a connected vehicle. In this case, a power converter is used that can switchably perform either conversion of a DC voltage to an AC voltage or conversion of a DC voltage to a DC voltage having a different voltage value. In order to support both charging and discharging, electricity does not flow in only one direction between the power converter and the storage battery. To prevent a large inrush current from flowing between the storage battery and the power converter when the power line between the storage battery and the charging/discharging device is blocked, connect the storage battery that serves as a DC power source to the DC power source before turning on the switch circuit. It is necessary to increase the voltage on the DC side of the power converter to approximately the same voltage value. It is also possible to increase the voltage on the DC side of the power converter using a storage battery as a DC power source, but since a charging-only vehicle may be connected, a source other than the storage battery of the connected vehicle may be used as a power source to increase the voltage. As a power source other than a storage battery of a vehicle, a power system, interconnection equipment, a charging circuit provided in a charging/discharging device, etc. are used.

This makes it possible to perform both charging and discharging for vehicles having circuits around storage batteries of various configurations, including charge-only vehicles.

In the charging/discharging device according to an embodiment of the present disclosure, the predetermined value is a charging upper limit voltage value transmitted from an on-vehicle control device that controls charging and discharging of the storage battery in the vehicle.

In the charging/discharging device of the present disclosure, the voltage on the DC side of the power converter increases to the charging upper limit voltage value using a power source other than the storage battery of the vehicle. This allows the voltage of the power converter to be higher than the voltage of the vehicle's battery even if the connected vehicle is a charging-only vehicle and current from the vehicle's battery to the charging/discharging device is blocked. This allows charging to start smoothly.

In the charging/discharging device according to an embodiment of the present disclosure, the predetermined value is a voltage value of the storage battery.

In the charging/discharging device of the present disclosure, the voltage on the DC side of the power converter increases to the voltage of the vehicle's storage battery using a source other than the vehicle's storage battery as a power source. As a result, even if the connected vehicle is a charging-only vehicle and current from the vehicle's storage battery to the charging/discharging device is blocked, the voltage between the power converter of the charging/discharging device and the vehicle's storage battery is Once the battery is in an equilibrium state, charging can be started smoothly. Note that the balanced state here does not mean that they are completely equal, but also includes a substantially balanced state within an error range.

In the charging/discharging device according to an embodiment of the present disclosure, the control unit may increase the voltage toward the predetermined value while increasing the voltage in the vehicle before the voltage reaches the voltage value of the storage battery or the charging upper limit voltage value. When the voltage reaches the predetermined value, the switch circuit is turned on.

In the charging and discharging device of the present disclosure, before the voltage reaches an equilibrium state between the power converter of the charging and discharging device and the storage battery of the vehicle, preparations for starting charging and discharging are made between the charging and discharging device and the on-vehicle control device. It is possible to proceed with a predetermined sequence of completion.

In the charging/discharging device according to an embodiment of the present disclosure, the switch circuit includes a prevention circuit that prevents current from flowing from the storage battery to the power converter, and a detour for the prevention circuit, and the control unit includes the When a storage battery is to be charged, the switch circuit is turned on with the detour being cut off and the prevention circuit turned on, and the voltage on the DC side of the power converter is changed using a power source other than the storage battery. and raise it at a predetermined speed or less.

The charging/discharging device of the present disclosure targets a vehicle that is capable of both charging and discharging while turning on a prevention circuit that prevents current from flowing from the storage battery to the power converter in the case of a charging-only vehicle. A detour is provided to bypass the prevention circuit. By providing a prevention circuit, it is possible to prevent the flow of high voltage from the vehicle's storage battery to the charging/discharging device side, and also to prevent the voltage on the DC side of the power converter from flowing even if the voltage of the vehicle's storage battery is unknown. It can be gradually increased to reach an equilibrium state.

In the charging/discharging device according to an embodiment of the present disclosure, the switch circuit includes a relay provided on at least one of a positive side and a negative side of a power line, and a predetermined resistor connected in parallel to the relay to generate an inrush current. and a prevention circuit.

In the charging/discharging device of the present disclosure, in order to support both charging and discharging, in the switch circuit, the direct current of the power converter is An inrush current prevention circuit consisting of a relay with a resistor is provided on the side. This prevents a large current from flowing into the charging/discharging device from the storage battery of the DC power supply installed in the vehicle, while balancing the voltage between the power converter of the charging/discharging device and the storage battery of the vehicle. charging and discharging can be started smoothly.

In the charging/discharging device according to an embodiment of the present disclosure, the control unit turns off the relay when increasing the voltage on the DC side of the power converter, and when the voltage reaches the predetermined value, the control unit turns off the relay. Turn on the relay.

In the charging/discharging device of the present disclosure, it is possible to smoothly start either charging or discharging after the voltage between the power converter of the charging/discharging device and the storage battery of the vehicle reaches equilibrium while using an inrush current prevention circuit. .

According to the present disclosure, charging and discharging can be performed as appropriate for various vehicles including connected charging-only vehicles.

It is a block diagram showing the composition of the charging and discharging device in a 1st embodiment. It is a diagram showing the circuit configuration of a switch circuit of a charging/discharging device of a first embodiment and a switch circuit of a vehicle. It is a flow chart which shows an example of a processing procedure in a charging and discharging device of a 1st embodiment. It is a flow chart which shows an example of a processing procedure in a modification of a 1st embodiment. It is a flow chart which shows an example of a processing procedure in a charging and discharging device of a 2nd embodiment. It is a figure which shows the circuit structure of the switch circuit of the charging/discharging device of 3rd Embodiment, and the switch circuit of a vehicle. It is a flow chart which shows an example of a processing procedure in a charging and discharging device of a 3rd embodiment. It is a flow chart which shows an example of a processing procedure in a charging and discharging device of a 4th embodiment. It is a figure which shows the circuit structure of the switch circuit of the charging/discharging device of 5th Embodiment, and the switch circuit of a vehicle. It is a flow chart which shows an example of a processing procedure in a charging and discharging device of a 5th embodiment. It is a flow chart which shows an example of a processing procedure in a charging and discharging device of a 5th embodiment. It is a figure which shows the circuit structure of the switch circuit of the charging/discharging device of 6th Embodiment, and the switch circuit of a vehicle. It is a figure which shows the circuit structure of the switch circuit of the charging/discharging device of 7th Embodiment, and the switch circuit of a vehicle. It is a figure which shows the modification of a switch circuit. It is a figure which shows the modification of a switch circuit. It is a figure which shows the modification of a switch circuit. It is a figure which shows the modification of a switch circuit.

The present disclosure will be specifically described with reference to drawings showing embodiments thereof.

(First embodiment)
FIG. 1 is a block diagram showing the configuration of a charging/discharging device 1 in the first embodiment. FIG. 1 shows not only the charging/discharging device 1 but also the connection configuration with a connected vehicle V and the configuration inside the vehicle V.

Vehicle V is an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), or a fuel cell vehicle (FCV). It is.

Vehicle V includes a large-capacity power storage device 30 that can be used for driving the vehicle. Vehicle V includes a connector 35 to power line VPL connected to power storage device 30 , and an on-vehicle control device 32 that controls charging and discharging in power storage device 30 . A switch circuit 33 included in the charging/discharging circuit on the vehicle V side is interposed in the power line VPL, and the on-vehicle control device 32 controls ON and OFF of the switch circuit 33. The connector 35 includes a communication terminal for communicating with the on-vehicle control device 32.

The charging/discharging device 1 charges the power storage device 30 of the vehicle V using power from the power system E, and discharges the power stored in the power storage device 30 to a necessary power load group as appropriate, and in the event of a power outage, This is a device that causes the power storage device 30 to function as a constant voltage power source. The charging/discharging device 1 is connected via a power line PL to a distribution board 2 that connects to a power system E, a group of power loads, and a group of interconnected devices, and can also be connected to a vehicle V via a power line PL.

The charging/discharging device 1 includes a charging/discharging circuit 10 , a control section 11 , a vehicle communication section 12 , a power supply section 13 , an operation section 14 , and an upper communication section 16 . The charging/discharging circuit 10 includes various circuit elements such as a bidirectional inverter and various relays. The charging/discharging circuit 10 includes a switch circuit 10a connected to a connector 15 connected to a vehicle V, and a switch circuit 10b interposed in a power line PL connected to a power system E and a load via a distribution board 2. include. The charging/discharging circuit 10 is connected to a connector 15 on the vehicle V side via a switch circuit 10a and a power line PL.

The control unit 11 controls circuit elements included in the charging/discharging circuit 10, and controls charging/discharging switching, current amount, and voltage amount for the power storage device 30 of the vehicle V. The control unit 11 includes a CPU (Central Processing Unit) and a nonvolatile memory, and the CPU controls the charging/discharging circuit 10 by executing control processing based on a computer program 1P stored in the nonvolatile memory.

The computer program 1P stored in the nonvolatile memory of the control unit 11 may be a computer program 9P stored in a computer-readable storage medium 9 read by the CPU and stored in the memory.

The vehicle communication unit 12 can be communicatively connected to the vehicle control device 32 via the connector 15 and the connector 35. The communication connection protocol of the vehicle communication unit 12 only needs to be compliant with the charging/discharging method (for example, CHAdeMO) compatible with the vehicle V and the connectors 15, 35, and is compatible with multiple protocols to apply to different charging/discharging methods. It may also be possible to selectively execute one of them. In the present disclosure, the vehicle communication unit 12 communicates with the vehicle-mounted control device 32 via CAN (Controller Area Network). Communication may be realized by PLC.

The power supply section 13 includes a UPS (Uninterruptible Power Systems) circuit and a starting storage battery, and supplies power to the control section 11 . The power supply unit 13 supplies the power necessary for starting the charging/discharging device 1 from the starting storage battery during a power outage. The power supply unit 13 may charge the starting storage battery with power from the power system E, interconnected equipment, or vehicle V.

The operation unit 14 includes a display, a touch panel with a built-in display, and physical buttons, is exposed on the exterior of the charging/discharging device 1, and receives operations including START (startup) and STOP (end) from the user. The operation unit 14 may be configured to be isolated from the main body of the charging/discharging device 1, and may be configured as a remote controller in a building, for example. The operation unit 14 may be configured to receive operation information received via an operation interface of a communication terminal such as a smartphone or a tablet terminal owned by a user (or an administrator) via wireless communication. The control unit 11 may control the charging/discharging circuit 10 based on an operation accepted by the operating unit 14. The operation unit 14 includes a lamp, and is controlled by the control unit 11 to turn on in a color or pattern depending on the state.

The higher-level communication unit 16 realizes communication with a higher-level device (not shown) via a communication line CL. The upper communication unit 16 may be, for example, a communication module compatible with a communication line CL compliant with Ethernet (registered trademark), or a communication module compatible with a communication line CL compatible with ECHONET/ECHONETLite (registered trademark). Good too. The upper communication unit 16 may realize communication using PLC. The upper communication unit 16 may be a wireless communication module compatible with WiFi (registered trademark), Bluetooth (registered trademark), or carrier communication. Note that the upper communication unit 16 is not essential in the charging/discharging device 1 of the present disclosure.

As shown in FIG. 1, the charging/discharging circuit 10 of the charging/discharging device 1 configured as described above connects the switch circuit 10a and the switch circuit on the vehicle V side when the connector 15 is connected to the connector 35 of the vehicle V. 33 and is connected to the power storage device 30 of the vehicle V by a power line PL. As shown in FIG. 1, the charging/discharging circuit 10 is connected to a power grid E, a power load group, and interconnection equipment via a switch circuit 10b and a distribution board 2 by a power line PL. The charging/discharging device 1 controls the transfer of power between the power system E, the power storage device 30 of the vehicle V, the power load group, and interconnected equipment. When the switch circuit 10b, the switch circuit 10a, and the switch circuit 33 are all in the ON state, the charging/discharging circuit 10 discharges the power storage device 30 to the load group via the power line PL, or discharges the power storage device 30 to the load group, or connects the power storage device 30 to the interconnection equipment or the power grid. The power storage device 30 can be charged from E.

FIG. 2 is a diagram showing the circuit configurations of the switch circuit 10a of the charging/discharging device 1 of the first embodiment and the switch circuit 33 of the vehicle V. As shown in FIG. 2, the switch circuit 10a of the charging/discharging device 1 includes a pair of relays 102 and 103 on the positive (P) side and negative (N) side, an inrush current prevention circuit 104, and a voltage detection section 105. It is composed of: The switch circuit 33 of the vehicle V also includes a pair of relays 331 and 332 on the positive (P) side and negative (N) side. In FIG. 2, since the configuration other than the switch circuit 33 on the vehicle V side differs depending on the individual vehicle V, the configuration of the charging/discharging circuit before and after the switch circuit 33 is shown by broken line blocks. The charging/discharging device 1 can be used regardless of the configuration of the target vehicle V.

A capacitor C1 is provided on the DC output (vehicle) side of the bidirectional inverter 101. As will be described later, the switch circuit 10a converts AC power into DC using the bidirectional inverter 101 and slowly charges the capacitor C1 before turning on both the pair of relays 102 and 103. The control unit 11 controls the voltage on the positive side to gradually increase. "Slowly" corresponds to a predetermined speed stored in memory. Note that the power converted into DC by the bidirectional inverter 101 may be from the power system E or a DC power source corresponding to the power system E.

The inrush current prevention circuit 104 in the switch circuit 10a of the charging/discharging device 1 includes a resistor R and a relay 106 connected in parallel to the positive relay 102. When operating the inrush current prevention circuit 104, after the charging of the capacitor C1 described above is completed, the control unit 11 turns on the negative side relay 103 and relay 106 to operate the inrush current prevention circuit 104. Alternatively, the voltage value on the DC side of bidirectional inverter 101 is made equal to or higher than the voltage value of power storage device 30. As a result, the positive (P) side relay 102 and the negative (N) side relay 103 are turned on at the same time, and are directly connected to the large capacity power storage device 30 (DC power supply) on the vehicle V side. Even if this happens, a large rush current can be prevented from flowing from power storage device 30 to bidirectional inverter 101. Note that by subsequently turning off the relay 106, it is possible to reliably prevent inrush current from flowing. Note that in the above description, the resistor R and the relay 106 are connected in parallel to the positive side relay 102, but the resistor R and the relay 106 are connected in parallel to the negative side relay 103 instead of the positive side relay 102. or may be connected in parallel to both the positive side relay 102 and the negative side relay 103. Alternatively, the relay 106 may be omitted and only the resistor R may be connected in parallel.

The processing up to the start of charging and discharging the power storage device 30 of the vehicle V by the charging and discharging device 1 having such a configuration will be described. FIG. 3 is a flowchart showing an example of the processing procedure in the charging/discharging device 1 of the first embodiment. When the control unit 11 is activated in response to an operation on the start button of the operation unit 14, it starts the following process. In addition, the control unit 11 may start the following process when receiving a start-up instruction from a host device or when started by its own scheduler function.

When the control unit 11 of the charging/discharging device 1 confirms the connection between the connector 15 and the connector 35, that is, the connection with the vehicle V (step S101), the control unit 11 turns on the lock of the connector 15 and the connector 35 (step S102). Connection can be confirmed by determining whether or not a predetermined signal can be exchanged. If it is not connected, an error will occur and the start process cannot be executed.

The control unit 11 causes the vehicle communication unit 12 to establish a communication connection with the in-vehicle control device 32 (step S103). Once the communication connection is established, the control unit 11 transmits the setting information on the charging/discharging device 1 side to the vehicle-mounted control device 32 from the vehicle communication unit 12 (step S104).

In response to the transmission of the setting information in step S104, the control unit 11 determines whether vehicle information including the charging upper limit voltage value transmitted from the in-vehicle control device 32 has been received (step S105). If it is determined that the vehicle information has not been received (S105: NO), the control unit 11 returns the process to step S105 and waits until the vehicle information is received.

If it is determined that the vehicle information has been received (S105: YES), the control unit 11 controls the DC side of the bidirectional inverter 101, that is, the switch circuit 10a side, based on the charging upper limit voltage value included in the received vehicle information. A voltage is applied with the charging upper limit voltage value as the upper limit (step S106). At this point, the operation (power conversion) of the bidirectional inverter 101 is not started.

In a case where the connected vehicle V is a charging-only vehicle or is in a state where discharging is not possible, power to the capacitor C1 may not be obtained from the power storage device 30 even if it is connected to the power storage device 30. In step S106, the control unit 11 can apply the bidirectional inverter 101 or the power supply unit 13 as a power source. A charging circuit may be provided separately. If the connected vehicle V is compatible with V2X and can also be discharged, power to the capacitor C1 is obtained from the power storage device 30, and the capacitor C1 is charged to balance the voltage with the vehicle V side as described later. It is better to do this.

The control unit 11 determines whether the switch circuit 33 on the vehicle V side is turned on (step S107). In step S107, the control unit 11 may directly determine whether the switch circuit 33 is turned on, or may determine whether a notification that the switch circuit 33 is turned on is received from the in-vehicle control device 32. It's okay.

If it is determined that the switch circuit 33 on the vehicle V side is not turned on (S107: NO), the control unit 11 returns the process to step S107. In this case, it is not necessary to reach an equilibrium state even after starting voltage application.

If it is determined that the switch circuit 33 on the vehicle V side is turned on (S107: YES), the control unit 11 turns on the relay 106 of the inrush current prevention circuit 104 and the negative side relay 103 (step S108), and restarts the operation. The completion of the start procedure is notified to the on-vehicle control device 32 (step S109). In step S108, the control unit 11 may confirm that the voltage on the DC side of the bidirectional inverter 101 is equal to or higher than the voltage of the power storage device 30 by applying the voltage on the DC side of the bidirectional inverter 101 in step S106. The control unit 11 proceeds with the process without waiting for the voltage on the DC side of the bidirectional inverter 101 and the voltage on the vehicle V side to be in an equilibrium state.

The control unit 11 determines whether a notification of completion of the driving start procedure has been received from the on-vehicle control device 32 (step S110). If it is determined that the completion notification has not been received from the in-vehicle control device 32 (S110: NO), the control unit 11 returns the process to step S110. During this time, the relay 106 of the inrush current prevention circuit 104 and the negative side relay 103 are kept ON.

If it is determined that the completion notification has been received (S110: YES), the control unit 11 determines whether the voltage on the DC side of the bidirectional inverter 101 and the voltage of the vehicle V that can be detected by the voltage detection unit 105 are in an equilibrium state. It is determined whether or not (step S111). If it is determined that the equilibrium state is not reached (S111: NO), the control unit 11 returns the process to step S111 and waits until the equilibrium state is reached. In step S111, the control unit 11 may determine whether or not current is flowing, that is, whether the current value is smaller than a predetermined value.

If it is determined that an equilibrium state has been reached (S111: YES), the control unit 11 turns off the relay 106 of the inrush current prevention circuit 104 and turns on the positive relay 102 (step S112). As a result, the operation of the bidirectional inverter 101 is started, and preparation for charging and discharging is completed. When the switch circuit 10b is turned on, charging and discharging are started.

In the processing procedure shown in the flowchart of FIG. 3, the control unit 11 starts the communication connection and only when it is determined that the vehicle V is a charging-only vehicle, the control unit 11 controls the DC inverter 101 according to the procedure from step S106 onwards. You may also perform processing to increase the voltage on the side.

As a result, irrespective of the configuration before and after the switch circuit 33 on the vehicle V side, processing is also performed to prevent inrush current to the bidirectional inverter 101 using the inrush current prevention circuit 104 without using the power storage device 30 as a power source. Preparations for charging and discharging can be completed at the same time.

(Modified example)
The process up to the start of charging and discharging in the first embodiment may be replaced with the following procedure. FIG. 4 is a flowchart illustrating an example of a processing procedure in a modification of the first embodiment. Among the processing procedures shown in the flowchart of FIG. 4, the processing procedures shown in the flowchart of FIG. 3 of the first embodiment are given the same step numbers and detailed explanations will be omitted. In a modified example, the charging/discharging device 1 is provided with a current detection section that detects the current between the bidirectional inverter 101 and the power storage device 30. Note that the processing procedure of the modified example can also be adopted in the following second to seventh embodiments.

In the modified example, when the control unit 11 determines that vehicle information has been received (S105: YES), the switch circuit 33 on the vehicle V side is turned on without applying voltage to the DC side of the bidirectional inverter 101. It is determined whether it has become (S107).

Then, when the control unit 11 turns on the relay 106 and the negative side relay 103 of the inrush current prevention circuit 104 (S108), it determines whether an inrush current has been detected (step S201). If it is determined that an inrush current is not detected, that is, if the voltages of the power storage device 30 and the capacitor C1 (the voltage on the DC side of the bidirectional inverter 101) are in a balanced state (S201: NO), the control unit 11 performs the operation start procedure. The on-vehicle control device 32 is notified of the completion of (S109). The control unit 11 determines whether a notification of completion of the driving start procedure has been received from the on-vehicle control device 32 (S110). If it is determined that the completion notification has not been received from the in-vehicle control device 32 (S110: NO), the control unit 11 returns the process to step S110.

If it is determined that the completion notification has been received (S110: YES), the control unit 11 activates the inrush current prevention circuit without waiting for the DC side voltage of the bidirectional inverter 101 to reach an equilibrium state with the voltage of the vehicle V. 104 relay 106 is turned off and the positive side relay 102 is turned on (S112). The reason why there is no need to wait for the voltage on the DC side of the bidirectional inverter 101 to reach an equilibrium state with the voltage of the vehicle V is because it can be determined that no rush current flows, that is, the voltage is in an equilibrium state. The control unit 11 ends the process.

If it is determined that an inrush current has been detected (S201: YES), the control unit 11 notifies the on-board control device 32 of the completion of the driving start procedure (step S202), and the on-vehicle control device 32 notifies the completion of the driving start procedure. is received (step S203). In this case, if it is determined that the completion notification has not been received (S203: NO), the control unit 11 returns the process to step S203.

If it is determined that the completion notification has been received in step S203 (S203: YES), the control unit 11 determines that the voltage on the DC side of the bidirectional inverter 101 and the voltage of the vehicle V that can be detected by the voltage detection unit 105 are in an equilibrium state. It is determined whether or not (S111). When the control unit 11 determines that the equilibrium state is not reached (S111: NO), the process returns to step S111. If it is determined that the equilibrium state has been reached (S111: YES), the control unit 11 advances the process to step S112.

(Second embodiment)
The configuration of the charging/discharging device 1 of the second embodiment is the same as that of the charging/discharging device 1 of the first embodiment, and only the processing procedure is different. Hereinafter, among the configurations of the charging/discharging device 1 of the second embodiment, the same components as those of the charging/discharging device 1 of the first embodiment will be given the same reference numerals and detailed explanations will be omitted.

FIG. 5 is a flowchart showing an example of a processing procedure in the charging/discharging device 1 of the second embodiment. Among the processing procedures shown in the flowchart of FIG. 5, the processing procedures shown in the flowchart of FIG. 3 of the first embodiment are given the same step numbers and detailed explanations will be omitted.

In the second embodiment, after transmitting the setting information in step S104 (S104), the control unit 11 of the charging/discharging device 1 determines whether the switch circuit 33 on the vehicle V side is turned ON without waiting for reception of the vehicle information. (Step S125). In step S125, the control unit 11 may directly determine whether the switch circuit 33 is turned on, or determine whether a notification that the switch circuit 33 is turned on is received from the on-vehicle control device 32. It's okay. During this time, the control unit 11 receives vehicle information transmitted from the in-vehicle control device 32.

If it is determined that the switch circuit 33 on the vehicle V side is not turned on (S125: NO), the control unit 11 returns the process to step S125. During this time, the control unit 11 may exchange information with the on-vehicle control device 32.

If it is determined that the switch circuit 33 on the vehicle V side is turned on (S125: YES), the control unit 11 measures the voltage on the positive side connected to the vehicle V using the voltage detection unit 105 (Step S126). The control unit 11 applies a voltage to the DC side of the bidirectional inverter 101, that is, the switch circuit 10a side, with the voltage on the vehicle V side obtained in step S126 as the upper limit (step S127), and advances the process to step S108. The control unit 11 may proceed with the process after the voltage on the DC side of the bidirectional inverter 101 and the voltage on the vehicle V side are in an equilibrium state.

In the second embodiment, since it is determined in step S125 whether the switch circuit 33 on the vehicle V side is turned on, the control unit 11 notifies the on-vehicle control device 32 of the completion of the driving start procedure. (S109), and it is determined whether an equilibrium state has been reached (S111). If it is determined that the equilibrium state has been reached (S111: YES), the control unit 11 turns off the relay 106 of the inrush current prevention circuit 104 and turns on the positive relay 102 (S112).

In step S127, in the case where the connected vehicle V is a charging-only vehicle or is in a state where discharging is not possible, power to the capacitor C1 cannot be obtained from the power storage device 30 even if it is connected to the power storage device 30. , the control unit 11 can apply power from the power system E or the power supply unit 13 as a power source. If the connected vehicle V is compatible with V2X and can also be discharged, power to the capacitor C1 is obtained from the power storage device 30, and the capacitor C1 is charged to balance the voltage with the vehicle V side as described later. It is better to do this.

Also in the second embodiment, regardless of the configuration before and after the switch circuit 33 on the vehicle V side, the inrush current prevention circuit 104 is used to connect the bidirectional inverter 101 and the power storage device 30 without using the power storage device 30 as a power source. Preparations for charging and discharging can be completed while also performing processing to prevent inrush current.

(Third embodiment)
FIG. 6 is a diagram showing the circuit configurations of the switch circuit 10a of the charging/discharging device 1 of the third embodiment and the switch circuit 33 of the vehicle V. The configuration of the charging/discharging device 1 of the third embodiment is the same as that of the charging/discharging device 1 of the first embodiment, except for a part of the configuration of the switch circuit 10a and detailed processing procedures. Portions common to the configuration of the discharge device 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 6, the switch circuit 10a of the charging/discharging device 1 of the third embodiment includes, in addition to a pair of relays 102, 103 and a voltage detection section 105, a backflow prevention circuit (diode) 107 and a , a short circuit 108 is provided. In the third embodiment, the rush current prevention circuit 104 is not provided. Also in FIG. 6, since the configuration other than the switch circuit 33 on the vehicle V side differs depending on the individual vehicle V, the uncertain configuration of the charging/discharging circuit before and after the switch circuit 33 is shown by broken line blocks. The charging/discharging device 1 can be used regardless of the configuration of the target vehicle V.

The backflow prevention circuit 107 is a diode as shown in FIG. 6, and is a circuit used only when charging the power storage device 30 of the vehicle V. The backflow prevention circuit 107 is interposed between the voltage detection section 105 and the connector 15. The short circuit 108 is connected in parallel to the backflow prevention circuit 107 and is a circuit that turns on and off the direct connection between the voltage detection section 105 and the connector 15 without passing through the backflow prevention circuit 107.

FIG. 7 is a flowchart showing an example of a processing procedure in the charging/discharging device 1 of the third embodiment. Among the processing procedures shown in the flowchart of FIG. 7, the processing procedures shown in the flowchart of FIG. 3 of the first embodiment are given the same step numbers and detailed explanations will be omitted.

In the third embodiment, when the control unit 11 establishes a communication connection with the on-vehicle control device 32 (S103), it turns on (enables) the backflow prevention circuit 107 (Step S131). In step S131, the control unit 11 turns off the short circuit 108.

The control unit 11 determines whether the vehicle-side switch circuit 33 is turned on (step S132). In step S132, the control unit 11 may directly determine whether the switch circuit 33 is turned on, or may determine whether a notification that the switch circuit 33 is turned on is received from the in-vehicle control device 32. It's okay.

If it is determined that the switch circuit 33 on the vehicle side is not turned on (S132: NO), the control unit 11 returns the process to step S132.

If it is determined that the switch circuit 33 on the vehicle side is turned on (S132: YES), the control unit 11 notifies the on-vehicle control device 32 of the completion of the operation start procedure on the charging/discharging device 1 side (Step S133), It is determined whether a notification of completion of the driving start procedure has been received from the on-vehicle control device 32 (step S134). If it is determined that the completion notification has not been received from the on-vehicle control device 32 (S134: NO), the control unit 11 returns the process to step S134. During this time, the backflow prevention circuit 107 remains enabled.

If it is determined that the completion notification has been received (S134: YES), the control unit 11 turns on the relays 102 and 103 (step S135).

In step S135, if the voltage on the DC output side of the bidirectional inverter 101 and the voltage of the power storage device 30 match, the control unit 11 may leave the backflow prevention circuit 107 ON or close the short circuit 108. The backflow prevention circuit 107 may be short-circuited by turning ON. When the short circuit 108 is turned on, power loss in the diode can be avoided.

The control unit 11 soft-starts the bidirectional inverter 101 (starts from 0V) (step S136). The control unit 11 determines whether the connected vehicle V is a charging-only vehicle (step S137). In step S137, the control unit 11 may make the determination based on information obtained by transmitting and receiving setting information and vehicle information (S104, S105).

In steps S<b>135 and S<b>136 , control unit 11 may control the voltage on the DC output side of bidirectional inverter 101 to be equal to or lower than the voltage of power storage device 30 .

If it is determined that the vehicle is a charging-only vehicle (S137: YES), the control unit 11 completes preparations for charging. Thereafter, the voltage on the DC side of the bidirectional inverter 101, which gradually increases the output voltage, and the vehicle V side become balanced, and charging is started.

If it is determined that the vehicle is not a charge-only vehicle (S137: NO), the control unit 11 turns on (enables) the short circuit 108 to bypass the backflow prevention circuit 107 (Step S138), and ends the process.

The process after establishing the communication connection with the in-vehicle control device in step S103 includes increasing the voltage on the DC side of the bidirectional inverter 101 based on the received vehicle information as shown in the first embodiment or the second embodiment. Also, processing based on the transmission and reception of information with the in-vehicle control device 32 is executed. The process when it is determined in step S131 that the vehicle is not a charge-only vehicle is not limited to the process procedure shown in the first embodiment or the second embodiment. The process may be such that the relays 102 and 103 are turned on after reaching an equilibrium state.

In the third embodiment, the control unit 11 discharges the capacitor C1 to lower the voltage every time the bidirectional inverter 101 is stopped. Thereby, the voltage on the DC side of the bidirectional inverter 101 remains high, and it is possible to prevent inrush current from flowing to the vehicle V side.

With the configuration using the backflow prevention circuit 107, when the vehicle V, which is a charging-only vehicle, is connected, the voltage is balanced between the power storage device 30 of the vehicle V and the charging/discharging device 1 side with the diode inserted. This allows for trouble-free charging and discharging.

(Fourth embodiment)
The configuration of the charging/discharging device 1 of the fourth embodiment is the same as that of the charging/discharging device 1 of the third embodiment, and only the processing procedure is different. Hereinafter, among the configurations of the charging/discharging device 1 of the fourth embodiment, the same components as those of the charging/discharging device 1 of the third embodiment will be denoted by the same reference numerals and detailed explanations will be omitted.

FIG. 8 is a flowchart showing an example of the processing procedure in the charging/discharging device 1 of the fourth embodiment. Among the processing procedures shown in the flowchart of FIG. 8, the processing procedures shown in the flowchart of FIG. 3 of the first embodiment are given the same step numbers and detailed explanations will be omitted.

In the fourth embodiment, the control unit 11 soft-starts the bidirectional inverter 101 (S136), and then determines whether an operation to start charging has been received through the operation unit 14 (Step S141).

If it is determined that the charging start operation has been received (S141: YES), the control unit 11 determines that charging has started, and immediately ends the preparation process without turning on the short circuit 108.

If it is determined that the charging start operation has not been received (S141: NO), the control unit 11 determines that the discharging has started, and turns on (enables) the short circuit 108 to bypass the backflow prevention circuit 107 (S138). Finish the preparation process. Note that the case where the charge start operation has not been received means that the charge start operation has not been received, that is, the battery is in a standby state with no driving instruction, or the case that the discharge start operation has been received.

Also in the fourth embodiment, the control unit 11 discharges the capacitor C1 to lower the voltage every time the bidirectional inverter 101 is stopped.

When the inrush current prevention circuit 104 having the circuit configuration shown in FIG. 5 in the third and fourth embodiments is not used, the DC power side of the bidirectional inverter 101 must be If there is no power source for increasing the voltage other than power storage device 30, it is difficult to implement self-sustaining operation (discharge from power storage device 30 to the power load group). In this case, a dedicated charging circuit may be provided in the power supply section 13 of the charging/discharging device 1, thereby increasing the voltage on the DC power side of the bidirectional inverter 101.

(Fifth embodiment)
FIG. 9 is a diagram showing the circuit configurations of the switch circuit 10a of the charging/discharging device 1 and the switch circuit 33 of the vehicle V according to the fifth embodiment. The configuration of the charging/discharging device 1 of the fifth embodiment is the same as that of the charging/discharging device 1 of the first and third embodiments, except for a part of the configuration of the switch circuit 10a and detailed processing procedures. Portions common to the configuration of the charging/discharging device 1 of the third embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The switch circuit 10a of the charging/discharging device 1 of the fifth embodiment includes an inrush current prevention circuit 104 provided in parallel to the relay 102, and a backflow prevention circuit 107 and a short circuit 108 on the vehicle V side. Since each function is as explained in the first embodiment and the third embodiment, detailed explanation will be omitted.

10 and 11 are flowcharts illustrating an example of a processing procedure in the charging/discharging device 1 of the fifth embodiment. Among the processing procedures shown in the flowcharts of FIGS. 10 and 11, the processing procedures shown in the flowchart of FIG. 3 of the first embodiment are given the same step numbers and detailed explanations will be omitted.

In the third embodiment, when the control unit 11 establishes a communication connection with the in-vehicle control device 32 (S103), the control unit 11 transmits the setting information on the charging/discharging device 1 side to the in-vehicle control device 32 from the vehicle communication unit 12. Send (S104).

In response to the transmission of the setting information, the control unit 11 receives vehicle information including the charging upper limit voltage value transmitted from the in-vehicle control device 32 (step S151), and determines whether the connected vehicle V is a charging-only vehicle. (Step S152).

If it is determined that the vehicle is a charging-only vehicle (S152: YES), the backflow prevention circuit 107 is turned on (valid) (step S153). In step S153, the control unit 11 turns off the short circuit 108.

Based on the charging upper limit voltage value included in the received vehicle information, the control unit 11 applies a voltage to the DC side of the bidirectional inverter 101, that is, the switch circuit 10a side, with the charging upper limit voltage value as the upper limit (step S154). At this time, the control unit 11 uses the power system E or the power supply unit 13 as a power source to apply voltage and charge the capacitor C1.

The control unit 11 determines whether the vehicle-side switch circuit 33 is turned on (step S155). In step S155, the control unit 11 may directly determine whether the switch circuit 33 is turned on, or determine whether a notification that the switch circuit 33 is turned on is received from the on-vehicle control device 32. It's okay.

If it is determined that the switch circuit 33 on the vehicle side is not turned on (S155: NO), the control unit 11 returns the process to step S155. In this case, it is not necessary to reach an equilibrium state even after starting voltage application.

If it is determined that the switch circuit 33 on the vehicle side is turned on (S155: YES), the control unit 11 turns on the relay 106 of the inrush current prevention circuit 104 and the negative side relay 103 (step S156), and closes the short circuit. 108 is turned on (step S157).

The control unit 11 notifies the vehicle-mounted control device 32 of the completion of the driving start procedure (step S158). The control unit 11 proceeds with the process without waiting for the voltage on the DC side of the bidirectional inverter 101 and the voltage on the vehicle V side to be balanced.

The control unit 11 determines whether a notification of completion of the driving start procedure has been received from the on-vehicle control device 32 (step S159). If it is determined that the completion notification has not been received from the in-vehicle control device 32 (S159: NO), the control unit 11 returns the process to step S159. During this time, the relay 106 of the inrush current prevention circuit 104 and the negative side relay 103 are kept ON.

If it is determined that the completion notification has been received (S159: YES), the control unit 11 determines whether the DC side voltage of the bidirectional inverter 101 and the voltage of the vehicle V that can be detected by the voltage detection unit 105 have reached an equilibrium state. It is determined whether or not (step S160). If it is determined that the equilibrium state is not reached (S160: NO), the control unit 11 returns the process to step S160 and waits until the equilibrium state is reached.

If it is determined that the equilibrium state has been reached (S160: YES), the control unit 11 turns off the relay 106 of the inrush current prevention circuit 104 and turns on the positive relay 102 (step S161). The control unit 11 turns off the short circuit 108 (step S162), and preparations for charging and discharging are completed. When the switch circuit 10b is turned on, charging starts. Here, the control unit 11 does not need to soft start the bidirectional inverter 101. The process of turning off the short circuit 108 in step S162 may be omitted.

If it is determined in step S152 that the vehicle is not a charge-only vehicle (S152: NO), the control unit 11 executes the process for the vehicle V that supports charging and discharging (step 163), and completes the preparation process. The process in step S163 may be a process in which the capacitor C1 is charged using the power storage device 30 of the vehicle V as a power source, and the relays 102 and 103 are turned on after the capacitor C1 is brought into an equilibrium state.

Note that the processing procedure shown in the flowcharts of FIGS. 10 and 11 is an example. If the vehicle is a charging-only vehicle (S152: YES), the control unit 11 executes a process of turning on the backflow prevention circuit 107 and soft-starting the bidirectional inverter 101, as shown in the third and fourth embodiments. However, it is not necessary to increase the voltage in advance using the inrush current prevention circuit 104. If it is determined that the vehicle is not a charging-only vehicle (S152: NO), the processes of steps S153 to S163 may be executed.

(Sixth embodiment)
FIG. 12 is a diagram showing the circuit configurations of the switch circuit 10a of the charging/discharging device 1 and the switch circuit 33 of the vehicle V according to the sixth embodiment. The configuration of the charging/discharging device 1 of the sixth embodiment is the same as that of the charging/discharging device 1 of the first and fifth embodiments, except for a part of the configuration of the switch circuit 10a and detailed processing procedures. Portions common to the configuration of the charging/discharging device 1 of the fifth embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The switch circuit 10a of the sixth embodiment includes a pair of relays 102 and 103 on the positive (P) side and negative (N) side, an inrush current prevention circuit 104, a voltage detection section 105, and a backflow prevention circuit 107. It is composed of: The inrush current prevention circuit 104 includes a relay 106 and a resistor R connected in parallel to the positive side relay 102. Backflow prevention circuit 107 is a diode connected in parallel to relay 102.

In the sixth embodiment, the control unit 11 executes the process shown in the flowchart of FIG. 3 of the first embodiment and the process shown in the flowchart of FIG. 4 of the second embodiment. The control unit 11 may execute a procedure similar to the processing procedure shown in the flowcharts of FIGS. 10 and 11 of the fifth embodiment. Note that the switch circuit 10a in the sixth embodiment does not include the short circuit 108, and the backflow prevention circuit 107 is connected in parallel to the relay 102, so the processing steps shown in the flowcharts of FIGS. 10 and 11 are The processing procedure for turning on and off the short circuit 108 is replaced by turning on and off the inrush current prevention circuit 104.

With the configuration of the charging/discharging device 1 of the sixth embodiment, the voltage on the DC side of the bidirectional inverter 101 is used to start charging/discharging, whether the vehicle is compatible with both charging/discharging or a charging-only vehicle. The voltage can be increased to a required level, and a predetermined sequence based on regulations between the vehicle V and the charging/discharging device 1 can be executed.

Note that in the sixth embodiment, in the processing of steps S156 and S157 in the flowcharts of FIGS. 10 and 11, charging is controlled not to occur until the voltage on the DC side of the bidirectional inverter 101 becomes higher than the voltage of the power storage device 30. .

(Seventh embodiment)
FIG. 13 is a diagram showing the circuit configurations of the switch circuit 10a of the charging/discharging device 1 and the switch circuit 33 of the vehicle V according to the seventh embodiment. Except for a part of the configuration of the switch circuit 10a and detailed processing procedures, the configuration of the charging/discharging device 1 of the seventh embodiment is the same as that of the charging/discharging device 1 of the first and fifth embodiments. Portions common to the configuration of the charging/discharging device 1 of the fifth embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The switch circuit 10a of the seventh embodiment includes a pair of relays 102 and 103 on the positive (P) side and negative (N) side, an inrush current prevention circuit 104, a voltage detection section 105, and a backflow prevention circuit 107. It is composed of: The inrush current prevention circuit 104 includes a relay 106 and a resistor R connected in parallel to the positive side relay 102. The backflow prevention circuit 107 includes a relay 109 and a diode connected in parallel to the relay 102.

In the seventh embodiment, the control unit 11 executes a procedure similar to the processing procedure shown in the flowcharts of FIGS. 9 and 10 of the fifth embodiment. Note that since the switch circuit 10a in the seventh embodiment does not include the short circuit 108, the processing procedure for turning on and off the short circuit 108 among the processing procedures shown in the flowcharts of FIGS. This is replaced by ON and OFF of the prevention circuit 104.

With the configuration of the charging/discharging device 1 of the seventh embodiment, the voltage on the DC side of the bidirectional inverter 101 is used to start charging/discharging, regardless of whether the vehicle is compatible with both charging/discharging or a charging-only vehicle. The voltage can be increased to a required level, and a predetermined sequence based on regulations between the vehicle V and the charging/discharging device 1 can be executed.

Also in the seventh embodiment, in the processing of steps S156 and S157 in the flowcharts of FIGS. 10 and 11, the control is performed so that charging is not performed until the voltage on the DC side of the bidirectional inverter 101 becomes higher than the voltage of the power storage device 30. .

In the fifth to seventh embodiments, when the inrush current prevention circuit 104 and the backflow prevention circuit 107 are used together, the inrush current is Prevention circuit 104 may be used to charge capacitor C1 with power from power storage device 30.

In the first to seventh embodiments, the switch circuit 10a has been described as including a pair of relays 102 and 103, with at least one of them turned off to standby for charging and discharging, and both of them turned on to start charging and discharging. However, the switch circuit 10a includes a relay 102 (103) provided on at least one of the positive (P) side and the negative (N) side of the power line. The inrush current prevention circuit 104 is preferably connected to at least one of the relays 102 (103). 14 to 17 are diagrams showing modified examples of the switch circuit 10a.

The switch circuit 10a shown in FIG. 14 does not include the negative (N) side relay 103, as is clear when compared with the switch circuit 10a of the first embodiment shown in FIG. In the switch circuit 10a shown in FIG. 14, the rush current prevention circuit 104 includes a relay 106 connected in series with a resistor R, and connected in parallel to the positive (P) side relay 102. Also in the switch circuit 10a shown in FIG. 14, the control unit 11 executes the processing procedure shown in the first embodiment, its modification, or the second embodiment.

The switch circuit 10a shown in FIG. 15 does not include the positive (P) side relay 102, as is clear when compared with the switch circuit 10a of the first embodiment shown in FIG. In the switch circuit 10a shown in FIG. 15, the inrush current prevention circuit 104 includes a relay 106 connected in series with a resistor R, and connected in parallel to the negative (N) side relay 103. In the switch circuit 10a shown in FIG. 15, the control unit 11 executes the processing procedure shown in the first embodiment, its modification, and the second embodiment by replacing the relay 102 and the relay 103.

The switch circuit 10a shown in FIG. 16 includes a pair of relays 102 and 103, as is clear when compared with the switch circuit 10a of the first embodiment shown in FIG. It is connected in parallel to the relay 103 on the N) side. In the switch circuit 10a shown in FIG. 16, the control unit 11 executes the processing procedure shown in the first embodiment, its modification, and the second embodiment by replacing the relay 102 and the relay 103.

The switch circuit 10a shown in FIG. 17 includes a pair of relays 102 and 103, as is clear when compared with the switch circuit 10a of the first embodiment shown in FIG. It is connected in parallel to both the relay 102 on the P) side and the relay 103 on the negative (N) side. The switch circuit 10a may have the configuration shown in FIG. 17.

The configurations of the relays 102 (103) in each of the switch circuits 10a shown in FIGS. 14 to 17 are also applicable to the switch circuits 10a of the modified example and the second to seventh embodiments. The inrush current prevention circuit 104 or the backflow prevention circuit 107 is preferably connected to at least one of the relays 102 (103). The connection form of the inrush current prevention circuit 104 in each of the switch circuits 10a shown in FIGS. 14 to 17 is the same as in the switch circuit 10a shown in FIG. It is also applicable to the switch circuit 10a shown.

The embodiments disclosed above are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the claims, and includes all changes within the meaning and range equivalent to the claims.

1 Charging and discharging device 11 Control unit 10 Charging and discharging circuit 10a, 10b Switch circuit 101 Bidirectional inverter (power converter)
102, 103, 106 Relay 104 Inrush current prevention circuit 105 Voltage detection section 107 Backflow prevention circuit (diode)
108 Short circuit 1P Computer program V Vehicle 30 Power storage device 32 On-vehicle control device 33 Switch circuit 331,332 Relay

Claims (8)

A charging and discharging device that is connected to a storage battery that serves as a DC power source provided in a vehicle and controls charging and discharging between the storage battery and a power source or a load,
A power converter that switchably performs any of the following: converting AC voltage to DC voltage, converting DC voltage to AC voltage, and converting DC voltage to DC voltage;
a switch circuit that switches ON and OFF of power transfer between the DC side of the power converter and the storage battery;
a control unit that controls ON and OFF of the switch circuit;
Equipped with
The control unit raises the voltage on the DC side of the power converter to a predetermined value using a power source other than the storage battery before turning on the switch circuit. The charging/discharging device according to claim 1, wherein the predetermined value is a charging upper limit voltage value transmitted from an on-vehicle control device that controls charging and discharging of the storage battery in the vehicle. The charging/discharging device according to claim 1, wherein the predetermined value is a voltage value of the storage battery. The control unit includes:
While increasing the voltage toward the predetermined value, before the voltage reaches the voltage value of the storage battery or the charging upper limit voltage value, transmitting a driving preparation completion notification to the vehicle;
The charging/discharging device according to claim 2 or 3, wherein the switch circuit is turned on when the voltage reaches the predetermined value. The switch circuit includes a prevention circuit that prevents current from flowing from the storage battery to the power converter, and a detour of the prevention circuit,
The control unit includes:
When the storage battery is to be charged, the switch circuit is turned on while the detour is cut off and the prevention circuit is turned on;
The charging/discharging device according to claim 1, wherein the voltage on the DC side of the power converter is increased at a predetermined speed or less using a power source other than the storage battery. The switch circuit is
A relay provided on at least one of the positive side and the negative side of the power line,
The charging/discharging device according to any one of claims 1 to 3, further comprising an inrush current prevention circuit configured by connecting a predetermined resistor in parallel to the relay. The control unit includes:
When increasing the voltage on the DC side of the power converter, turning off the relay,
The charging/discharging device according to claim 6, wherein the relay is turned on when the voltage reaches the predetermined value. A charging and discharging device that is connected to a storage battery that serves as a DC power source provided in a vehicle and controls charging and discharging between the storage battery and a power source or a load,
A DC power converter that, when connected to a vehicle, converts AC voltage to DC voltage, converts DC voltage to AC voltage, and converts DC voltage to DC voltage in a switchable manner. increasing the voltage on the side to a predetermined value as an upper limit using a power source other than the storage battery of the vehicle,
After the voltage on the DC side reaches the predetermined value, a switch circuit for switching ON and OFF of power transfer between the DC side of the power converter and the storage battery is turned on.

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