Charging / discharging device, vehicle, and method for controlling charging / discharging device

Abstract

To reduce a probability that power not compatible with a device is applied to the device when the device is connected to an outlet.SOLUTION: A bidirectional charger includes: a charging / discharging circuit that can be charged to and discharged from an external device, converts power from an inlet to DC power suitable to a power storage device, and further, coverts DC power from the power storage device to power to be discharged from an outlet; a switching system that performs switching between a state where the charging / discharging circuit and the inlet are electrically connected and a state where the charging / discharging circuit and the outlet are electrically connected; an ECU that controls the switching system; a voltage sensor that detects AC voltage of the inlet; and a voltage sensor that detects AC voltage of the outlet. The ECU determines that the switching system has a fault on condition that the AC voltage of the inlet is detected and the AC voltage of the outlet is detected (step S132), and performs control to prohibit charging / discharging (steps S133, S134).SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a charge / discharge device, a vehicle, and a control method for the charge / discharge device, and in particular to a charge / discharge device capable of charging / discharging with the outside, a vehicle including the charge / discharge device, and a control method for the charge / discharge device. [Background technology]

[0002] Conventionally, there has been a power supply device capable of charging a main battery and an auxiliary battery with a system power supply and outputting power for home appliances using the main battery as a power source without providing a dedicated DC / AC converter (see, for example, Patent Document 1). The power supply device of Patent Document 1 is provided with a plug to which power is input during charging and an outlet to which power is output during power supply. The connection of two power lines connecting the power supply device and the plug or outlet is switched by a C-contact relay. The C-contact relay is a relay in which, when a current flows through the coil, the common contact and the normally open contact are connected and the common contact and the normally closed contact are disconnected, whereas, when no current flows through the coil, the common contact and the normally closed contact are connected and the common contact and the normally open contact are disconnected. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-312395 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the power supply device of Patent Document 1, if a total short failure occurs in which all three terminals of the C-contact relay, namely the common contact, the normally open contact, and the normally closed contact, are shorted, there is a possibility that power that is not compatible with the equipment connected to the outlet via the plug (inlet) and the outlet may be applied to this equipment.

[0005] This disclosure has been made to solve such problems, and its purpose is to provide a charging / discharging device, a vehicle, and a control method for a charging / discharging device that can reduce the possibility of power being applied to an appliance connected to an outlet that is not compatible with the appliance. [Means for solving the problem]

[0006] The charging / discharging device according to the disclosure is capable of charging / discharging with the outside, and includes a charging / discharging circuit that converts power from an inlet that connects a connector that supplies power from the outside into DC power suitable for a power storage device that stores power, and also converts the DC power of the power storage device into power to be discharged from an outlet that connects a plug that discharges power to the outside, a switching system that switches between a state in which the charging / discharging circuit and the inlet are electrically connected and a state in which the charging / discharging circuit and the outlet are electrically connected, a control device that controls the switching system, a first detection unit that detects an AC voltage at the inlet, and a second detection unit that detects an AC voltage at the outlet. The control device determines that the switching system is faulty and controls to prohibit charging / discharging on the condition that an AC voltage is detected at the inlet by the first detection unit and an AC voltage is detected at the outlet by the second detection unit.

[0007] When an AC voltage is detected at the inlet and an AC voltage is detected at the outlet, it is considered that the inlet and the outlet are electrically conductive. With this configuration, when an AC voltage is detected at the inlet and an AC voltage is detected at the outlet, it is determined that the switching system is faulty, and charging and discharging are prohibited. As a result, it is possible to provide a charging and discharging device that can reduce the possibility that power that is not compatible with a device connected to the outlet is applied to the device.

[0008] The control device may prohibit charging and discharging by controlling the charging and discharging circuit so as not to execute power conversion.

[0009] With this configuration, it is possible to prevent power from being applied from the power storage device via the charge / discharge circuit to a device connected to the outlet.

[0010] The control device may prohibit charging and discharging by controlling an external device that supplies power to the inlet to prohibit the supply of power.

[0011] According to this configuration, it is possible to prevent power from being applied from an external device that supplies power to a device connected to the outlet via the inlet.

[0012] The second detection unit may be capable of detecting DC voltage in addition to AC voltage at the outlet, and the control device may determine that the switching system is not at fault and control the system to allow charging and discharging if the first detection unit detects AC voltage at the inlet while the second detection unit detects DC voltage at the outlet.

[0013] Even if the AC voltage input from the inlet is not applied to the outlet, a voltage may be detected at the outlet due to the charge remaining in the capacitor of the device connected to the outlet. With this configuration, if the detected outlet voltage is a DC voltage, it can be determined that the AC voltage of the inlet is not being applied to the outlet, and therefore it can be determined that the switching system is not malfunctioning. As a result, when an AC voltage is detected at the inlet while a DC voltage is detected at the outlet, it can be determined that the switching system is not malfunctioning and charging and discharging can be permitted.

[0014] The first detection unit may be capable of detecting DC voltage in addition to AC voltage at the inlet, and the control device may determine that the switching system has failed and control the system to prohibit charging and discharging when the first detection unit detects DC voltage at the inlet and the second detection unit detects DC voltage at the outlet.

[0015] A voltage may be detected at the outlet due to a charge remaining in a capacitor of a device connected to the outlet. With this configuration, if the detected outlet voltage is DC and the detected inlet voltage is DC, it can be determined that the outlet DC voltage is applied to the inlet, and it can be determined that the switching system is faulty. As a result, if a DC voltage is detected at the inlet and a DC voltage is detected at the outlet, it can be determined that the switching system is faulty and charging and discharging can be prohibited.

[0016] According to another aspect of the present disclosure, a vehicle may include the above-described charging / discharging device, an inlet, an outlet, and a power storage device. With this configuration, it is possible to provide a vehicle that can reduce the possibility that power that is not compatible with a device connected to the outlet is applied to the device.

[0017] According to yet another aspect of the disclosure, a method for controlling a charging / discharging device is a method for controlling a charging / discharging device capable of charging / discharging with an outside. The charging / discharging device includes a charging / discharging circuit that converts power from an inlet that connects a connector that supplies power from the outside into DC power suitable for a power storage device that stores power, and also converts the DC power of the power storage device into power to be discharged from an outlet that connects a plug that discharges power to the outside, a switching system that switches between a state in which the charging / discharging circuit and the inlet are electrically connected and a state in which the charging / discharging circuit and the outlet are electrically connected, a control device that controls the switching system, a first detection unit that detects the voltage of the power of the inlet, and a second detection unit that detects the voltage of the power of the outlet. The control method includes a step in which the control device determines that the switching system is faulty on the condition that the first detection unit detects an AC voltage at the inlet and the second detection unit detects an AC voltage at the outlet, and a step in which the control device controls the switching system to prohibit charging / discharging when the control device determines that the switching system is faulty.

[0018] With this configuration, it is possible to provide a method for controlling a charging / discharging device that can reduce the possibility of power that is not compatible with a device connected to an outlet being applied to the device. Effect of the Invention

[0019] According to this disclosure, it is possible to provide a charging / discharging device, a vehicle, and a control method for a charging / discharging device that can reduce the possibility of power that is not compatible with a device connected to an outlet being applied to the device. [Brief description of the drawings]

[0020] [Figure 1] 1 is a diagram showing an example of the overall configuration of a charging system including a vehicle equipped with a bidirectional charger according to an embodiment and a power supply facility. [Diagram 2] FIG. 2 is a diagram showing an example of the configuration of a bidirectional charger according to the embodiment. [Diagram 3]5 is a flowchart showing an example of a flow of pre-charge processing according to the first embodiment. [Figure 4] 10 is a flowchart showing an example of a flow of pre-charge processing according to a second embodiment. [Diagram 5] FIG. 13 is a diagram illustrating an example of the configuration of a bidirectional charger according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] [First embodiment] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and their description will not be repeated.

[0022] <Vehicle and power supply equipment configuration> Fig. 1 is a diagram showing an example of the overall configuration of a charging system including a vehicle 1 equipped with a bidirectional charger 200 according to this embodiment and a power supply facility 300. Referring to Fig. 1, the charging system includes the vehicle 1 and the power supply facility 300. The power supply facility 300 is a facility for supplying AC power to the vehicle 1. An example will be described in which the vehicle 1 according to this embodiment is an electric vehicle (hereinafter also referred to as "BEV (Battery Electric Vehicle)").

[0023] The vehicle 1 further includes a power storage device 10, a current sensor 15, a system main relay (hereinafter also referred to as "SMR (System Main Relay)") 20, a power control unit (hereinafter also referred to as "PCU (Power Control Unit)") 30, a power output device 40, drive wheels 50, an inlet 70, a charging relay 60, a bidirectional charger 200, an outlet 80, an ECU (Electronic Control Unit) 100, and an HMI (Human Machine Interface) 130.

[0024] The power storage device 10 is a rechargeable DC power source, and is formed, for example, by a secondary battery such as a nickel-metal hydride or lithium ion battery. The power storage device 10 stores power supplied from an AC power source 310 of the power supply equipment 300, as well as power generated by the power output device 40. Note that a large-capacity capacitor can also be used as the power storage device 10.

[0025] The current sensor 15 detects the charging current IB input / output to / from the power storage device 10, and outputs the detection result to the ECU 100.

[0026] SMR 20 is provided between power storage device 10 and power lines PL1, NL1. SMR 20 is a relay for electrically connecting / disconnecting power storage device 10 and power lines PL1, NL1.

[0027] PCU 30 collectively refers to power conversion devices for receiving electric power from the power storage device 10 and driving the power output device 40. For example, PCU 30 includes an inverter for driving a motor included in the power output device 40, a converter for boosting the electric power output from the power storage device 10, and the like.

[0028] Power output device 40 collectively refers to devices for driving drive wheels 50. Power output device 40 includes, for example, a motor generator that drives drive wheels 50. Power output device 40 also generates electricity by the motor generator that drives drive wheels 50 when vehicle 1 is braked, and outputs the generated electricity to PCU 30.

[0029] The inlet 70 is electrically connected to input lines ACL1, ACL2 of the bidirectional charger 200. The inlet 70 is configured to be connectable to a connector 340 of the power supply equipment 300. Signal lines L1, L2 are provided between the inlet 70 and the ECU 100. The signal line L1 is a signal line for transmitting a pilot signal CPLT for exchanging predetermined information between the vehicle 1 and the power supply equipment 300. The signal line L2 is a signal line for transmitting a connector connection signal PISW indicating a connection state between the inlet 70 and the connector 340.

[0030] In this embodiment, the outlet 80 is a 100V AC outlet and is configured to be connectable to a plug 810 of a device 800 that is capable of operating on 100V AC power. In the device 800, as shown in Fig. 1, a capacitor 820 may be connected to a power line that is connected to the plug 810. The other end of the capacitor 820 is connected to a ground 830. The outlet 80 is electrically connected to the bidirectional charger 200.

[0031] The charging relay 60 is a relay for electrically connecting / disconnecting the bidirectional charger 200 and the power lines PL1, NL1. The charging relay 60 switches between an open state and an closed state based on a control signal from the ECU 100.

[0032] The bidirectional charger 200 is electrically connected to the power storage device 10 via a charging relay 60. The bidirectional charger 200 converts AC power input to an inlet 70 into DC power having a charging voltage for the power storage device 10, and converts the DC power of the power storage device 10 into AC power output from an outlet 80, in accordance with a command from the ECU 100. The DC power converted by the bidirectional charger 200 from the AC power from the inlet 70 is supplied to the power storage device 10 via the charging relay 60, and the power storage device 10 is charged. The AC power converted by the bidirectional charger 200 from the DC power from the power storage device 10 is supplied via the outlet 80 to a device 800 connected to the outlet 80.

[0033] The ECU 100 includes a CPU (Central Processing Unit) 110, a memory 120, and an input / output buffer (not shown) for inputting and outputting various signals. The memory 120 includes a RAM (Random Access Memory) and a ROM (Read Only Memory). The CPU 110 loads a program stored in the ROM into the RAM and executes it. The program stored in the ROM describes the processing to be executed by the CPU 110. The ECU 100 executes a predetermined arithmetic processing by the CPU 110 based on various signals input from the input / output buffer according to the program and information stored in the memory 120, and controls each device (SMR 20, PCU 30, charging relay 60, bidirectional charger 200, etc.) so that the vehicle 1 is in a desired state based on the arithmetic result. Note that these controls are not limited to processing by software, and can also be constructed and processed by dedicated hardware (electronic circuit).

[0034] The HMI 130 is controlled by the ECU 100, and notifies the user of predetermined information by display or voice in response to the execution of a program.

[0035] The power supply facility 300 includes an AC power supply 310 outside the vehicle, an electric vehicle supply equipment (EVSE) 320, and a charging cable 330. A connector 340 configured to be connectable to an inlet 70 of the vehicle 1 is provided at the end of the charging cable 330.

[0036] The AC power supply 310 is constituted by, for example, a commercial power supply system, but is not limited to this and various power supplies can be applied.

[0037] EVSE 320 controls the supply / cutoff of AC power from AC power source 310 to vehicle 1 via charging cable 330. EVSE 320 is provided, for example, in a charging stand for supplying power to vehicle 1. EVSE 320 meets, for example, the required specifications of the "SAE J1772 (SAE Electric Vehicle Conductive Charge Coupler) Standard." Note that the function of EVSE 320 is not limited to being provided in the charging stand, and for example, a CCID (Charging Circuit Interrupt Device) box having the function of EVSE 320 may be provided in the charging cable. In this case, for example, an outlet plug provided at one end (opposite to connector 340) of the charging cable is connected to AC power source 310.

[0038] The EVSE 320 includes a CCID 321 and a CPLT control circuit 322. The CCID 321 is a relay provided in a power supply path from the AC power supply 310 to the vehicle 1, and is controlled by the CPLT control circuit 322. In this embodiment, the EVSE 320 of the power supply equipment 300 is capable of supplying 200V AC power to the vehicle 1.

[0039] The CPLT control circuit 322 generates a pilot signal CPLT to be communicated with the ECU 100 of the vehicle 1, and outputs the pilot signal CPLT to the ECU 100 through a dedicated signal line included in the charging cable 330. The potential of the pilot signal CPLT is manipulated in the ECU 100. The CPLT control circuit 322 controls the CCID 321 based on the potential of the pilot signal CPLT. That is, by manipulating the potential of the pilot signal CPLT in the ECU 100, the CCID 321 can be remotely controlled from the ECU 100.

[0040] Fig. 2 is a diagram showing an example of the configuration of the bidirectional charger 200 of this embodiment. Referring to Fig. 2, the bidirectional charger 200 includes a charge / discharge circuit 210, switching relays 220 and 230, and voltage sensors 240, 250 and 260 for both AC and DC use.

[0041] The charge / discharge circuit 210 converts the AC power from the inlet 70 into DC power suitable for the power storage device 10 and converts the DC power of the power storage device 10 into power to be discharged from the outlet 80 in accordance with a control signal from the ECU 100.

[0042] In this embodiment, each of the switching relays 220 and 230 is configured as a C-contact relay, and configures a switching system that switches between a state in which the charge / discharge circuit 210 and the inlet 70 are electrically connected and a state in which the charge / discharge circuit 210 and the outlet 80 are electrically connected in accordance with a control signal from the ECU 100. Specifically, the common contacts of each of the switching relays 220 and 230 are connected to two terminals of the charge / discharge circuit 210, the normally closed contacts are connected to two terminals of the inlet 70, and the normally open contacts are connected to two terminals of the outlet 80.

[0043] Voltage sensor 240 detects the DC and AC voltages between the power lines between charge / discharge circuit 210 and switching relays 220, 230, and outputs to ECU 100 a signal indicating the type of power (DC / AC) and the voltage value detected.

[0044] Voltage sensor 250 detects the DC and AC voltages between the power lines between inlet 70 and switching relays 220, 230, and outputs to ECU 100 a signal indicating the type of power (DC / AC) and the voltage value detected.

[0045] Voltage sensor 260 detects the DC and AC voltages between the power lines between outlet 80 and switching relays 220, 230, and outputs to ECU 100 a signal indicating the type of power (DC / AC) and the voltage value detected.

[0046] In the above-mentioned bidirectional charger 200, if a total short failure occurs in which all three terminals, i.e., the common contact, the normally open contact, and the normally closed contact, of the switching relays 220, 230, which are C-contact relays, are short-circuited, there is a possibility that power that is not compatible with the device 800 will be applied to the device 800 connected to the outlet 80 from the inlet 70 via the outlet 80.

[0047] Therefore, when the voltage sensor 250 detects an AC voltage at the inlet 70 and the voltage sensor 260 detects an AC voltage at the outlet 80, the ECU 100 determines that the switching relays 220, 230 are faulty and controls the relays to prohibit charging and discharging.

[0048] When an AC voltage is detected at the inlet 70 and an AC voltage is detected at the outlet 80, it is considered that the inlet 70 and the outlet 80 are electrically conductive. According to the above-mentioned configuration, when an AC voltage is detected at the inlet 70 and an AC voltage is detected at the outlet 80, it is determined that the switching relays 220, 230 are faulty, and charging and discharging are prohibited. As a result, it is possible to reduce the possibility that power that is not compatible with the device 800 connected to the outlet 80 is applied to the device 800.

[0049] Fig. 3 is a flowchart showing an example of the flow of pre-charging processing according to the first embodiment. Referring to Fig. 3, the pre-charging processing is called from a higher-level process at predetermined intervals and executed by the CPU 110 of the ECU 100.

[0050] CPU 110 uses connector connection signal PISW to determine whether connector 340 is connected to inlet 70 (step S111). If it determines that connector 340 is not connected (NO in step S111), CPU 110 returns the process to be executed to the higher-level process that called this pre-charging process.

[0051] On the other hand, if it is determined that the connector 340 is connected (YES in step S111), the CPU 110 switches the connection destination of the switching relays 220, 230, which are C-contact relays, with the bidirectional charger 200 from the outlet 80 side to the inlet 70 side (step S112).

[0052] Next, the CPU 110 switches the charging relay 60 to the connected state (step S113), and switches the CCID 321 to the connected state (step S114).Then, the CPU 110 controls the bidirectional charger 200 to perform charging operation for a short period of time until the determination of failures of the switching relays 220, 230 described below is completed (step S115).

[0053] CPU 110 uses a signal from voltage sensor 250 to determine whether or not a voltage is detected at inlet 70 (step S121). If it is determined that no voltage is detected at inlet 70 (NO at step S121), that is, if no voltage is applied at inlet 70 even though connector 340 is connected and power is supplied from power supply equipment 300 to inlet 70 of vehicle 1 via connector 340, CPU 110 determines that there is another malfunction (step S131). The other malfunction is a malfunction other than that of switching relays 220, 230, such as a switching failure of switching relays 220, 230 from the outlet 80 side to the inlet 70 side, or a break in the charging system from power supply equipment 300 to vehicle 1.

[0054] If it is determined that a voltage is detected at inlet 70 (YES in step S121), CPU 110 uses a signal from voltage sensor 260 to determine whether or not a voltage is detected at outlet 80 (step S122).

[0055] If it is determined that a voltage is detected at outlet 80 (YES in step S122), CPU 110 uses the signal from voltage sensor 260 to determine whether or not the voltage at the side of outlet 80 is a DC voltage (step S123).

[0056] If it is determined that the voltage on the outlet 80 side is a DC voltage (YES in step S123), the CPU 110 uses the signal from the voltage sensor 250 to determine whether or not the voltage on the inlet 70 side is a DC voltage (step S124).

[0057] If it is determined that no voltage is detected at the outlet 80 (NO in step S122), or if it is determined that the voltage on the inlet 70 side is not a DC voltage (NO in step S124), the CPU 110 determines that the switching relays 220, 230 do not have a total short-circuit failure (step S125), and controls the bidirectional charger 200 to start charging control (step S126). After step S126, the CPU 110 returns the process to be executed to the process that called this pre-charging start process.

[0058] If it is determined that the voltage on the outlet 80 side is not a DC voltage (NO in step S123), or if it is determined that the voltage on the inlet 70 side is a DC voltage (YES in step S124), the CPU 110 determines that the switching relays 220, 230 have a total short-circuit fault (step S132).

[0059] After step S131 or step S132, CPU 110 switches CCID 321 to the cut-off state (step S133), switches charging relay 60 to the cut-off state, and stops charging / discharging circuit 210 (step S134). Then, CPU 110 controls HMI 130 to notify the contents of the failure (step S135). After step S135, CPU 110 returns the process to be executed to the process that called this pre-charging process.

[0060] [Second embodiment] In the first embodiment, whether or not it is determined that the switching relays 220, 230 are faulty is determined according to the voltages of the inlet 70 and the outlet 80, as shown in steps S121 to S124 of Fig. 3. In the second embodiment, whether or not the switching relays 220, 230 are faulty is determined as described below with reference to Fig. 4.

[0061] Fig. 4 is a flowchart showing an example of the flow of pre-charging processing according to the second embodiment. Referring to Fig. 4, this pre-charging processing is called from a higher-level process at predetermined intervals and executed by the CPU 110 of the ECU 100. The processes other than steps S141 to S143 in Fig. 4 are common to Fig. 3, and therefore overlapping descriptions will not be repeated.

[0062] After step S115, CPU 110 uses the signal from voltage sensor 250 to determine whether or not a voltage is detected on the side of inlet 70 (step S141). If it is determined that no voltage is detected on the side of inlet 70 (NO in step S141), CPU 110 advances the process to be executed to the process after step S131 described in FIG.

[0063] If it is determined that a voltage is detected on the inlet 70 side (YES in step S141), the CPU 110 determines whether or not the inlet 70 side is AC and the outlet 80 side is AC (step S142).

[0064] If it is determined that at least one of the inlet 70 side and the outlet 80 side is not AC (NO in step S142), CPU 110 determines whether the inlet 70 side is DC and the outlet 80 side is DC (step S143).

[0065] If it is determined that the inlet 70 side is AC and the outlet 80 side is AC (YES in step S142), or if it is determined that the inlet 70 side is DC and the outlet 80 side is DC (YES in step S143), CPU 110 advances the processing to be executed to the processing from step S132 onwards described in FIG. 3.

[0066] If it is determined that at least one of the inlet 70 side and the outlet 80 side is not DC (NO in step S143), that is, if the inlet 70 side is AC and the outlet 80 side is DC, or if the inlet 70 side is AC and there is no voltage on the outlet 80 side, CPU 110 proceeds to the processing to be executed from step S125 onwards described in Figure 3.

[0067] [Third embodiment] In the first and second embodiments described above, as explained in Fig. 2, the switching system that switches between a state in which the charge / discharge circuit 210 and the inlet 70 are electrically connected and a state in which the charge / discharge circuit 210 and the outlet 80 are electrically connected in accordance with a control signal from the ECU 100 is configured with two C-contact relays, namely, switching relays 220 and 230. In the third embodiment, the switching system is configured with two A-contact relays and two B-contact relays.

[0068] Fig. 5 is a diagram showing an example of the configuration of a bidirectional charger 200A according to a third embodiment. Referring to Fig. 5, the configuration of the bidirectional charger 200A other than the switching relays 271 to 274 is similar to that of the bidirectional charger 200 described in Fig. 2, and therefore overlapping description will not be repeated.

[0069] In this embodiment, the switching relays 271 and 273 are each configured as an A-contact relay. In this embodiment, the switching relays 272 and 274 are each configured as a B-contact relay. The A-contact relay is a relay in which the common contact and the normally open contact are connected when a current flows through the coil, and the common contact and the normally open contact are disconnected when no current flows through the coil. The B-contact relay is a relay in which the common contact and the normally closed contact are connected when a current flows through the coil, and the common contact and the normally closed contact are disconnected when no current flows through the coil.

[0070] The switching relays 271-274 configure a switching system that switches between a state in which the charge / discharge circuit 210 and the inlet 70 are electrically connected and a state in which the charge / discharge circuit 210 and the outlet 80 are electrically connected in accordance with a control signal from the ECU 100. Specifically, the common contacts of the switching relays 271 and 272 are connected to one terminal of the charge / discharge circuit 210, and the common contacts of the switching relays 273 and 274 are connected to the other terminal of the charge / discharge circuit 210. Normally open terminals of the switching relays 271 and 273, which are A-contact relays, are respectively connected to two terminals of the inlet 70. Normally closed terminals of the switching relays 272 and 274, which are B-contact relays, are respectively connected to two terminals of the outlet 80.

[0071] 3 and 4, the CPU 110 switches the common terminal connected to the charge / discharge circuit 210 and the normally open terminal connected to the inlet 70 to a connected state by passing a current through the coils of the switching relays 271 and 273, which are A-contact relays, and switches the common terminal connected to the charge / discharge circuit 210 and the normally closed terminal connected to the outlet 80 to a disconnected state by passing a current through the coils of the switching relays 272 and 274, which are B-contact relays. This switches the connection destination of the bidirectional charger 200 from the outlet 80 side to the inlet 70 side.

[0072] [Other variations] (1) In the embodiment described above, vehicle 1 is a BEV as shown in FIG. 1. However, the present invention is not limited to this, and vehicle 1 may be any vehicle that can be charged from an external source, and may be a plug-in hybrid vehicle (hereinafter also referred to as a "PHEV (Plug-in Hybrid Electric Vehicle)") or a fuel cell vehicle (hereinafter also referred to as a "FCEV (Fuel Cell Electric Vehicle)") equipped with an external charging function. When vehicle 1 is a PHEV, power output device 40 may include, for example, an engine in addition to a motor.

[0073] (2) In the embodiment described above, as shown in Fig. 1 and Fig. 2, AC power for charging is input from inlet 70. Then, charge / discharge circuit 210 of bidirectional charger 200 converts the AC power input from inlet 70 into DC power having a voltage suitable for power storage device 10 and outputs the DC power to power storage device 10.

[0074] However, without being limited thereto, DC power for charging may be input from inlet 70. Then, charge / discharge circuit 210 of bidirectional charger 200 may convert the DC power input from inlet 70 into DC power having a voltage suitable for power storage device 10 and output it to power storage device 10.

[0075] (3) In the above-described embodiment, outlet 80 is an AC 100V outlet as shown in Figures 1 and 2. However, without being limited to this, outlet 80 may be one that outputs AC power of another voltage, or one that outputs DC power of a predetermined voltage, for example, a DC 12V cigarette lighter socket or a DC 5V Universal Serial Bus (USB) socket.

[0076] (4) In the first and second embodiments described above, as described in Fig. 2, the switching system that switches between a state in which the charge / discharge circuit 210 and the inlet 70 are electrically connected and a state in which the charge / discharge circuit 210 and the outlet 80 are electrically connected in accordance with a control signal from the ECU 100 is configured with the switching relays 220 and 230 that are two C-contact relays. Also, in the third embodiment, as described in Fig. 5, the switching system is configured with the switching relays 271 and 273 that are two A-contact relays and the switching relays 272 and 274 that are two B-contact relays. However, the present invention is not limited to this, and the switching system may be configured with the switching relays 271 and 273 that are two B-contact relays and the switching relays 272 and 274 that are two A-contact relays.

[0077] (5) The above-described embodiments can be understood as disclosure of a vehicle 1, a charging / discharging device such as bidirectional charger 200, 200A, or a control device for a charging / discharging device such as ECU 100, and can be understood as disclosure of a control method for vehicle 1 or a charging / discharging device by a control device or a control program executed by the control device.

[0078] [summary] (1) As shown in Figures 1, 2 and 5, bidirectional charger 200, 200A is capable of charging and discharging with the outside, and includes charge / discharge circuit 210 that converts power from inlet 70, which connects connector 340 that supplies power from the outside, into DC power suitable for a power storage device that stores power, and also converts the DC power of power storage device 10 into power to be discharged from outlet 80, which connects plug 810 that discharges power to the outside, a switching system (switching relays 220, 230, switching relays 271-274) that switches between a state in which charge / discharge circuit 210 and inlet 70 are electrically connected and a state in which charge / discharge circuit 210 and outlet 80 are electrically connected, ECU 100 that controls the switching system, voltage sensor 250 that detects the AC voltage of inlet 70, and voltage sensor 260 that detects the AC voltage of outlet 80. As shown in Figures 3 and 4, when an AC voltage is detected at inlet 70 by voltage sensor 250 and an AC voltage is detected at outlet 80 by voltage sensor 260, ECU 100 determines that the switching system has failed (step S132) and performs control to prohibit charging and discharging (steps S133 and S134).

[0079] When an AC voltage is detected at the inlet 70 and an AC voltage is detected at the outlet 80, it is considered that the inlet 70 and the outlet 80 are electrically conductive. According to the above-mentioned configuration, when an AC voltage is detected at the inlet 70 and an AC voltage is detected at the outlet 80, it is determined that the switching system has failed, and charging and discharging are prohibited. As a result, it is possible to reduce the possibility that power that is not compatible with a device connected to the outlet 80 is applied to the device.

[0080] (2) As shown in FIGS. 3 and 4, the ECU 100 may prohibit charging and discharging by controlling the charging and discharging circuit 210 so as not to execute power conversion (step S134).

[0081] According to the above-described configuration, it is possible to prevent power from being applied from the power storage device 10 via the charge / discharge circuit 210 to the device 800 connected to the outlet 80.

[0082] (3) As shown in FIGS. 3 and 4, ECU 100 may prohibit charging and discharging by controlling power feeding equipment 300, which supplies electric power to inlet 70, to prohibit the supply of electric power (step S133).

[0083] According to the above-described configuration, it is possible to prevent power from being applied from the power supply facility 300 that supplies power to the device 800 connected to the outlet 80 via the inlet 70.

[0084] (4) As shown in Figures 2 and 5, the voltage sensor 260 is capable of detecting not only the AC voltage at the outlet 80 but also the DC voltage. As shown in Figures 3 and 4, when the voltage sensor 250 detects the AC voltage at the inlet 70 while the voltage sensor 260 detects the DC voltage at the outlet 80, the ECU 100 may determine that the switching system is not at fault (step S125) and perform control to permit charging and discharging (step S126).

[0085] Even when AC voltage input from inlet 70 is not being applied to outlet 80, a voltage may be detected at outlet 80 due to charge remaining in capacitor 820 of the device connected to outlet 80. With the above-described configuration, if the detected voltage at outlet 80 is a DC voltage, it can be determined that the AC voltage at inlet 70 is not being applied to outlet 80, and therefore it can be determined that the switching system is not malfunctioning. As a result, when AC voltage is detected at inlet 70 while DC voltage is detected at outlet 80, it can be determined that the switching system is not malfunctioning and charging / discharging can be permitted.

[0086] (5) As shown in Figures 2 and 5, voltage sensor 250 is capable of detecting DC voltage in addition to AC voltage at inlet 70. As shown in Figures 3 and 4, ECU 100 may determine that the switching system has failed (step S132) and perform control to prohibit charging and discharging (steps S133 and S134) on the condition that voltage sensor 250 detects DC voltage at inlet 70 and voltage sensor 260 detects DC voltage at outlet 80.

[0087] A voltage may be detected at the outlet 80 due to charge remaining in the capacitor 820 of the device 800 connected to the outlet 80. With the above-described configuration, when the detected voltage at the outlet 80 is DC and the detected voltage at the inlet 70 is DC, it can be determined that the DC voltage at the outlet 80 is being applied to the inlet 70, and therefore it can be determined that the switching system has failed. As a result, when a DC voltage is detected at the inlet 70 and a DC voltage is detected at the outlet 80, it can be determined that the switching system has failed and charging and discharging can be prohibited.

[0088] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the claims, not by the description of the embodiments described above, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0089] 1 vehicle, 10 power storage device, 15 current sensor, 20 SMR, 30 PCU, 40 power output device, 50 drive wheel, 60 charging relay, 70 inlet, 80 outlet, 100 ECU, 110 CPU, 120 memory, 130 HMI, 200, 200A charger, 210 charging / discharging circuit, 220, 230, 271-274 switching relay, 240, 250, 260 voltage sensor, 300 power supply equipment, 310 AC power source, 320 EVSE, 321 CCID, 322 CPLT control circuit, 330 charging cable, 340 connector, 800 device, 810 plug, 820 capacitor, 830 ground, ACL1, ACL2 input line, L1, L2 signal line, NL1, PL1 power line.

Claims

1. A charging / discharging device capable of charging / discharging between an external device and the device, a charge / discharge circuit that converts power from an inlet to which a connector for supplying power from the outside is connected into DC power suitable for a power storage device that stores the power, and also converts the DC power of the power storage device into power to be discharged from an outlet to which a plug for discharging the power to the outside is connected; a switching system that switches between a state in which the charging / discharging circuit and the inlet are electrically connected and a state in which the charging / discharging circuit and the outlet are electrically connected; A control device for controlling the switching system; A first detection unit that detects an AC voltage of the inlet; a second detection unit that detects the AC and DC voltages of the outlet; The control device includes: determining that the switching system is faulty and controlling to prohibit charging and discharging on the condition that the first detection unit detects an AC voltage at the inlet and the second detection unit detects an AC voltage at the outlet; A charging / discharging device that, on the condition that an AC voltage is detected at the inlet by the first detection unit and a DC voltage is detected at the outlet by the second detection unit, determines that the switching system is not faulty and controls to allow charging and discharging.

2. The charging / discharging device according to claim 1 , wherein the control device prohibits charging / discharging by controlling the charging / discharging circuit so as not to perform power conversion.

3. The charging / discharging device according to claim 1 , wherein the control device prohibits charging / discharging by controlling an external device that supplies electric power to the inlet to prohibit the supply of electric power.

4. The first detection unit is capable of detecting a DC voltage in addition to an AC voltage of the inlet, 4. The charging / discharging device according to claim 1, wherein the control device determines that the switching system is faulty and controls to prohibit charging / discharging when the first detection unit detects a DC voltage at the inlet and the second detection unit detects a DC voltage at the outlet.

5. A charging / discharging device according to any one of claims 1 to 4, The inlet; The outlet; A vehicle comprising the power storage device.

6. A method for controlling a charging / discharging device capable of charging / discharging with an external device, comprising: The charging / discharging device is a charge / discharge circuit that converts power from an inlet to which a connector for supplying power from the outside is connected into DC power suitable for a power storage device that stores the power, and also converts the DC power of the power storage device into power to be discharged from an outlet to which a plug for discharging the power to the outside is connected; a switching system that switches between a state in which the charging / discharging circuit and the inlet are electrically connected and a state in which the charging / discharging circuit and the outlet are electrically connected; A control device for controlling the switching system; A first detection unit that detects a voltage of the AC power of the inlet; a second detection unit that detects the voltage of the AC and DC power of the outlet; The control method includes: The control device determines that the switching system is faulty when the first detection unit detects an AC voltage at the inlet and the second detection unit detects an AC voltage at the outlet; When the control device determines that the switching system has a failure, the control device controls the switching system to prohibit charging and discharging; The control device determines that the switching system is not at fault when the first detection unit detects an AC voltage at the inlet and the second detection unit detects a DC voltage at the outlet; and when the control device determines that the switching system has not failed, performing control to permit charging and discharging.

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