In-vehicle power supply system

Abstract

To provide an in-vehicle power supply system in which a bidirectional charger is standardized even when the number of AC power supply ports and the rated voltage are varied depending on the type and specifications of a vehicle.SOLUTION: An in-vehicle power supply system 1 includes: a charging port IN; a bi-directional charger 2; an AC power supply port OUT; a distribution circuit 3 having a power distribution circuit for distributing an AC power input from an external power source side wire Lp to AC power supply ports OUT, out 1 and out 2 and a leakage detector EL; and a control unit 4 for controlling operations of the bi-directional charger 2.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an in-vehicle power supply system.

Background Art

[0002] As an in-vehicle power supply system, there is one equipped with a bidirectional charger that converts AC power output from an external power source into DC power and supplies it to an in-vehicle battery, or converts DC power output from the in-vehicle battery into AC power and supplies it to an AC power outlet (outlet) to which electrical appliances are connected. Related technologies include Patent Documents 1 and 2.

[0003] By the way, when the number and rated voltage of the AC power outlets change according to the type and specifications of the vehicle, the configuration of the bidirectional charger changes. For example, when increasing the number and rated voltage of the AC power outlets, it is necessary to increase the components used in the power distribution circuit and leakage detector in the bidirectional charger or replace them with other components.

[0004] Therefore, in the above in-vehicle power supply system, when the number and rated voltage of the AC power outlets change, there is a concern that the configuration of the bidirectional charger changes, making it impossible to achieve commonality of the bidirectional charger.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] An object according to one aspect of the present invention is to achieve commonality of the bidirectional charger in an in-vehicle power supply system even when the number and rated voltage of the AC power outlets change according to the type and specifications of the vehicle.

Means for Solving the Problem

[0007] One form of the in-vehicle power supply system according to the present invention includes a charging port, an external power supply side wiring connected to the charging port, and a vehicle-mounted battery side wiring, and converts AC power input from an external power supply through the charging port and the external power supply side wiring into DC power, and supplies the DC power to the vehicle-mounted battery through the vehicle-mounted battery side wiring, or converts DC power input from the vehicle-mounted battery through the vehicle-mounted battery side wiring into AC power, and supplies the AC power to the external power supply side wiring. It also includes a bidirectional charger, an AC power supply port, a power distribution circuit that distributes the AC power input from the external power supply side wiring to the AC power supply port, a distribution board including a leakage detector that detects leakage, and a control unit that controls the operation of the bidirectional charger.

[0008] In this way, by providing the power distribution circuit and the leakage detector in the distribution board instead of the bidirectional charger, even if the configuration of the power distribution circuit and the leakage detector changes due to changes in the number of AC power supply ports and the rated voltage, there is no need to change the configuration of the bidirectional charger, so the bidirectional charger can be made common.

[0009] The in-vehicle power supply system may also include a plurality of the AC power supply ports, the power distribution circuit distributes the AC power input from the external power supply side wiring to the plurality of AC power supply ports, and the distribution board may be configured to include a voltage detection unit or a current detection unit corresponding to each of the plurality of AC power supply ports.

[0010] Thereby, based on the voltage detected by the voltage detection unit or the current detected by the current detection unit, it is possible to determine whether an overvoltage abnormality or an overcurrent abnormality has occurred for each AC power supply port.

[0011] The in-vehicle power supply system may also include a plurality of the AC power supply ports, and the distribution board may be configured to include a plurality of cutoff switches connected between the plurality of AC power supply ports and the external power supply side wiring or the charging port.

[0012] Accordingly, a plurality of AC power supply ports and an external power supply side wiring or a charging port can be selectively connected or disconnected according to the situation where an abnormality has occurred or the user's request.

[0013] Further, the charging port may be connected to the external power supply side wiring via the distribution board.

[0014] Accordingly, since it is not necessary to provide connection terminals or the like for connecting the charging port in the external power supply side wiring, the external power supply side wiring can be made common.

[0015] Further, the in-vehicle power supply system includes a plurality of the AC power supply ports and a charging voltage detection unit that detects a voltage input from the charging port, and the control unit is configured to supply AC power input from the charging port to the AC power supply port corresponding to the voltage detected by the charging voltage detection unit among the plurality of AC power supply ports.

[0016] Accordingly, while charging the in-vehicle battery, AC power can be supplied to the AC power supply port corresponding to the voltage detected by the charging voltage detection unit.

[0017] Further, the in-vehicle power supply system includes a first and a second AC power supply port, the distribution board includes a voltage conversion circuit that converts an externally input AC voltage input from the charging port into a converted AC voltage, and the power distribution circuit is configured to output the externally input AC voltage to the first AC power supply port and output the converted AC voltage output from the voltage conversion circuit to the second AC power supply port.

[0018] Accordingly, while charging the in-vehicle battery, the externally input AC voltage can be output to the first AC power supply port and the converted AC voltage can be output to the second AC power supply port.

[0019] In addition, the in-vehicle power supply system includes first and second AC power supply ports. The bidirectional charger converts the DC power input from the external power supply side wiring into AC power and supplies it to the in-vehicle battery, and also converts the DC power output from the in-vehicle battery into first and second AC powers and supplies them to the external power supply side wiring. The power distribution circuit may be configured to supply the first AC power input from the external power supply side wiring to the first AC power supply port and supply the second AC power input from the external power supply side wiring to the second AC power supply port.

[0020] Thereby, while charging the in-vehicle battery, it is possible to supply the first AC power to the first AC power supply port and supply the second AC power to the second AC power supply port.

Advantages of the Invention

[0021] According to the present invention, in an in-vehicle power supply system, even if the number and rated voltage of the AC power supply ports change according to the type and specifications of the vehicle, it is possible to achieve commonization of the bidirectional charger.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0023] Hereinafter, embodiments will be described in detail with reference to the drawings.

[0024] FIG. 1 is a diagram showing an example of the in-vehicle power supply system according to the embodiment.

[0025] The in-vehicle power supply system 1 shown in FIG. 1 includes an in-vehicle battery B, a charging port IN, a bidirectional charger 2, an AC power supply port OUT (first AC power supply port), a plurality of AC power supply ports out (second AC power supply ports), a distribution board 3, and a control unit 4. For example, the in-vehicle power supply system 1 is mounted on a vehicle such as an electric vehicle or a plug-in hybrid vehicle, and converts AC power output from an external power source P such as a commercial power supply into DC power and supplies it to the in-vehicle battery B. Alternatively, the in-vehicle power supply system 1 converts DC power output from the in-vehicle battery B into AC power and supplies it to the AC power supply ports OUT, out1, and out2. Note that the rated voltage of the AC power supply port OUT is higher than the rated voltage of the AC power supply port out. For example, the rated voltage of the AC power supply port OUT is set to AC 200 [V], and the rated voltage of the AC power supply port out is set to AC 100 [V].

[0026] The in-vehicle battery B is, for example, a rechargeable battery such as a lithium-ion secondary battery, and supplies power to a drive device such as a driving motor.

[0027] The charging port IN is, for example, an inlet connected to a connector of a charging cable (not shown), and is provided on the side surface of the vehicle body or the like. When the connector of the charging cable and the charging port IN are connected to each other, an external charger (not shown) that supplies AC power from the external power source P and the in-vehicle power supply system 1 are connected to each other via the charging cable.

[0028] The bidirectional charger 2 is connected to an external power source side wiring Lp connected to the charging port IN and an in-vehicle battery side wiring Lb connected to the in-vehicle battery B. Further, the bidirectional charger 2 converts AC power input from the external power source P through the charging port IN and the external power source side wiring Lp into DC power, and supplies the DC power to the in-vehicle battery B through the in-vehicle battery side wiring Lb. Alternatively, the bidirectional charger 2 converts DC power input from the in-vehicle battery B through the in-vehicle battery side wiring Lb into AC power, and supplies the AC power to the external power source side wiring Lp. Note that the external power source side wiring Lp has a voltage line Lv1, a voltage line Lv2, and a neutral line LvN.

[0029] The AC power supply port OUT is, for example, an outlet to which a plug of an electrical appliance (such as an IH cooking heater) driven by AC 200 [V] is connected, and is provided in the vehicle console box or the like. Further, the AC power supply ports out1 and out2 are each, for example, an outlet to which a plug of an electrical appliance (such as a personal computer or a television) driven by AC 100 [V] is connected, one is provided in the vehicle console box or the like, and the other is provided on the vehicle deck side or the like. Also, the number of AC power supply ports OUT may be two or more. Also, the number of AC power supply ports out may be one or three or more. Also, only the AC power supply port OUT may be provided in the in-vehicle power supply system 1 by omitting the AC power supply port out, or only the AC power supply port out may be provided in the in-vehicle power supply system 1 by omitting the AC power supply port OUT.

[0030] The distribution board 3 includes a power distribution circuit described later, current detection units Si, Si1, Si2, voltage detection units Sv, Sv1, Sv2, and a leakage detector EL.

[0031] The power distribution circuit includes changeover switches SW1, SW2, and cutoff switches sw1 to sw4, and distributes the AC power input from the external power supply side wiring Lp to the AC power supply ports OUT, out1, and out2. For example, when 6 [kW] of AC power is supplied from the bidirectional charger 2 to the external power supply side wiring Lp, the power distribution circuit supplies 3 [kW] of AC power to the AC power supply port OUT and 1.5 [kW] of AC power to each of the AC power supply ports out1 and out2.

[0032] The changeover switches SW1 and SW2 are each constituted by, for example, an electromagnetic relay of the c-contact type. The changeover switch SW1 is connected between the voltage line Lv1 of the external power supply side wiring Lp and one terminal of the charging port IN, and one terminal of each of the AC power supply ports OUT, out1, and out2. The changeover switch SW2 is connected between the voltage line Lv2 of the external power supply side wiring Lp and the other terminal of the charging port IN, and the other terminal of each of the AC power supply ports OUT, out1, and out2. The operations of the changeover switches SW1 and SW2 are controlled by the control unit 4 to connect the external power supply side wiring Lp (voltage lines Lv1 and Lv2) and the charging port IN to each other, or to connect the external power supply side wiring Lp (voltage lines Lv1 and Lv2) and the AC power supply ports OUT, out1, and out2 to each other via the cutoff switches sw1 to sw4. That is, the changeover switches SW1 and SW2 switch the connection destination of the external power supply side wiring Lp to either the charging port IN or one of the AC power supply ports OUT, out1, and out2 on the AC power supply port side.

[0033] The cutoff switches sw1 and sw2 are each constituted by, for example, an electromagnetic relay of the a-contact or b-contact type. The cutoff switch sw1 is connected between the voltage line Lv1 of the external power supply side wiring Lp and one terminal of the AC power supply port OUT via the changeover switch SW1. The cutoff switch sw2 is connected between the voltage line Lv2 of the external power supply side wiring Lp and the other terminal of the AC power supply port OUT via the changeover switch SW2. When the cutoff switches sw1 and sw2 are controlled to be in the conducting state by the control unit 4, the AC power supply port OUT and the external power supply side wiring Lp (voltage lines Lv1 and Lv2) are connected to each other via the changeover switches SW1 and SW2. Also, when the cutoff switches sw1 and sw2 are controlled to be in the cutoff state by the control unit 4, the AC power supply port OUT and the external power supply side wiring Lp (voltage lines Lv1 and Lv2) are electrically cut off. Note that either one of the cutoff switches sw1 and sw2 may be omitted.

[0034] The cutoff switch sw3 is composed of, for example, an electromagnetic relay with an a-contact or a b-contact, and is connected between the voltage line Lv1 of the external power supply side wiring Lp and one terminal of the AC power supply port out1 via the changeover switch SW1. The other terminal of the AC power supply port out1 is connected to the neutral line LvN of the external power supply side wiring Lp. When the cutoff switch sw3 is controlled to be in the conductive state by the control unit 4, the AC power supply port out1 and the external power supply side wiring Lp (voltage line Lv1 and neutral line LvN) are connected to each other via the changeover switch SW1. Also, when the cutoff switch sw3 is controlled to be in the cutoff state by the control unit 4, the AC power supply port out1 and the external power supply side wiring Lp (voltage line Lv1 and neutral line LvN) are electrically cut off.

[0035] The cutoff switch sw4 is composed of, for example, an electromagnetic relay with an a-contact or a b-contact, and is connected between the voltage line Lv2 of the external power supply side wiring Lp and one terminal of the AC power supply port out2 via the changeover switch SW2. The other terminal of the AC power supply port out2 is connected to the neutral line LvN of the external power supply side wiring Lp. When the cutoff switch sw4 is controlled to be in the conductive state by the control unit 4, the AC power supply port out2 and the external power supply side wiring Lp (voltage line Lv2 and neutral line LvN) are connected to each other via the changeover switch SW2. Also, when the cutoff switch sw4 is controlled to be in the cutoff state by the control unit 4, the AC power supply port out2 and the external power supply side wiring Lp (voltage line Lv2 and neutral line LvN) are electrically cut off.

[0036] The current detection units Si, Si1, and Si2 are each composed of, for example, a Hall element or a shunt resistor. When the cutoff switches sw1 and sw2 are in the conductive state and the external power supply side wiring Lp and the AC power supply port OUT are connected to each other by the switching switches SW1 and SW2, the current detection unit Si detects the current flowing from the external power supply side wiring Lp to the AC power supply port OUT, and sends the detected current to the control unit 4. When the cutoff switch sw3 is in the conductive state and the external power supply side wiring Lp and the AC power supply port out1 are connected to each other by the switching switches SW1 and SW2, the current detection unit Si1 detects the current flowing from the external power supply side wiring Lp to the AC power supply port out1, and sends the detected current to the control unit 4. When the cutoff switch sw4 is in the conductive state and the external power supply side wiring Lp and the AC power supply port out2 are connected to each other by the switching switches SW1 and SW2, the current detection unit Si2 detects the current flowing from the external power supply side wiring Lp to the AC power supply port out2, and sends the detected current to the control unit 4.

[0037] The voltage detection units Sv, Sv1, and Sv2 are each composed of, for example, a voltage dividing resistor. When the cutoff switches sw1 and sw2 are in the conductive state and the external power supply side wiring Lp and the AC power supply port OUT are connected to each other by the switching switches SW1 and SW2, the voltage detection unit Sv detects the voltage applied to the AC power supply port OUT, and sends the detected voltage to the control unit 4. When the cutoff switch sw3 is in the conductive state and the external power supply side wiring Lp and the AC power supply port out1 are connected to each other by the switching switches SW1 and SW2, the voltage detection unit Sv1 detects the voltage applied to the AC power supply port out1, and sends the detected voltage to the control unit 4. When the cutoff switch sw4 is in the conductive state and the external power supply side wiring Lp and the AC power supply port out2 are connected to each other by the switching switches SW1 and SW2, the voltage detection unit Sv2 detects the voltage applied to the AC power supply port out2, and sends the detected voltage to the control unit 4.

[0038] The leakage current detector EL is constituted by, for example, a GFCI (Ground Fault Circuit Interrupter), and detects leakage current generated in the path between the external power supply side wiring Lp (voltage lines Lv1, Lv2, and neutral line LvN) and the AC power supply ports OUT, out1, and out2. For example, the leakage current detector EL includes a current sensor (e.g., a current transformer) that detects the current flowing in the paths between the voltage lines Lv1, Lv2, and neutral line LvN and the AC power supply ports OUT, out1, and out2 respectively, and a leakage current determination unit (e.g., an IC (Integrated Circuit)). The leakage current determination unit determines the presence or absence of leakage current based on the current detected by the current sensor in the leakage current detector EL when the external power supply side wiring Lp and the AC power supply ports OUT, out1, and out2 are connected to each other. The conduction / blocking state of each AC power supply port is determined by the states of the changeover switches SW1 and SW2 and the cut-off switches sw1 to sw4. When the balance of the current flowing in the conducting wiring (the difference between the current flowing from the bidirectional charger 2 to each conducting AC power supply port and the current flowing from each conducting AC power supply port to the bidirectional charger 2) is equal to or greater than a predetermined current threshold value, it is determined that leakage current has occurred in that path.

[0039] The control unit 4 is constituted by a processor or a programmable device (such as an FPGA (Field Programmable Gate Array) or a PLD (Programmable Logic Device)), and controls the operations of the bidirectional charger 2 and the distribution board 3 respectively. Note that the control unit 4 may be provided in the bidirectional charger 2 or the distribution board 3. Also, a control unit having a function of controlling the operation of the bidirectional charger 2 may be provided in the bidirectional charger 2, a control unit having a function of controlling the operation of the distribution board 3 may be provided in the distribution board 3, and the operations of the control unit 4 described later may be cooperatively performed by each control unit by transmitting and receiving data to and from each other.

[0040] For example, when the in-vehicle battery B is being charged, the control unit 4 connects the external power supply side wiring Lp and the charging port IN by means of the changeover switches SW1 and SW2, and sets the cutoff switches sw1 to sw4 in the cutoff state respectively. Further, the control unit 4 controls the operation of the bidirectional charger 2 to convert the AC power output from the external power supply P into DC power and supply it to the in-vehicle battery B.

[0041] Also, when power is supplied to the AC power supply ports OUT, out1, and out2, the control unit 4 sets the cutoff switches sw1 to sw4 in the conductive state respectively, and connects the external power supply side wiring Lp and the AC power supply ports OUT, out1, and out2 by means of the changeover switches SW1 and SW2. Further, the control unit 4 controls the operation of the bidirectional charger 2 to convert the DC power output from the in-vehicle battery B into AC power and supply it to the AC power supply ports OUT, out1, and out2. For example, when the operation of the bidirectional charger 2 is controlled so that a first AC power (for example, AC 200 [V]) is supplied between the voltage line Lv1 and the voltage line Lv2, a second AC power (for example, AC 100 [V]) is supplied between the voltage line Lv1 and the neutral line LvN, and a second AC power (for example, AC 100 [V]) is supplied between the voltage line Lv2 and the neutral line LvN, that is, so as to output single-phase three-wire AC power, an AC voltage of AC 200 [V] is supplied to the AC power supply port OUT, and AC voltages of AC 100 [V] are supplied to the AC power supply ports out1 and out2 respectively. Thereby, since different AC voltages can be simultaneously output from the AC power supply port OUT and the AC power supply ports out1 and out2 respectively, a plurality of electrical appliances having different drive voltages can be used simultaneously in the vehicle equipped with the in-vehicle power supply system 1.

[0042] Further, when the control unit 4 supplies power only to the AC power supply port OUT according to the user's request, the cutoff switches sw1 and sw2 are each made conductive, the cutoff switches sw3 and sw4 are each made non-conductive, and the external power supply side wiring Lp and the AC power supply port OUT are connected by the changeover switches SW1 and SW2. Further, the control unit 4 causes the bidirectional charger 2 to convert the DC power output from the in-vehicle battery B into single-phase three-wire AC power and supply it to the external power supply side wiring Lp. Thereby, AC power can be output only from the AC power supply port OUT. Note that the bidirectional charger 2 may supply single-phase AC between the voltage line Lv1 and the voltage line Lv2.

[0043] Further, when the control unit 4 supplies power only to the AC power supply port out1 according to the user's request, the cutoff switch sw3 is made conductive, the cutoff switches sw1, sw2, and sw4 are each made non-conductive, and the external power supply side wiring Lp and the AC power supply port out1 are connected by the changeover switches SW1 and SW2. Further, the control unit 4 causes the bidirectional charger 2 to convert the DC power output from the in-vehicle battery B into single-phase three-wire AC power and supply it to the external power supply side wiring Lp. Thereby, AC power can be output only from the AC power supply port out1. Note that the bidirectional charger 2 may supply single-phase AC between the voltage line Lv1 and the neutral line LvN.

[0044] Further, when the control unit 4 supplies power only to the AC power supply port out2 according to the user's request, the cutoff switch sw4 is made conductive, the cutoff switches sw1 to sw3 are each made non-conductive, and the external power supply side wiring Lp and the AC power supply port out2 are connected by the changeover switches SW1 and SW2. Further, the control unit 4 causes the bidirectional charger 2 to convert the DC power output from the in-vehicle battery B into single-phase three-wire AC power and supply it to the external power supply side wiring Lp. Thereby, AC power can be output only from the AC power supply port out2. Note that the bidirectional charger 2 may supply single-phase AC between the voltage line Lv2 and the neutral line LvN.

[0045] Also, when power is supplied to the AC power supply ports OUT, out1, and out2, if the leakage current detector EL detects a leakage current, the control unit 4 stops the bidirectional charger 2 and switches the cutoff switches sw1 to sw4 from the conductive state to the cutoff state. Or, when power is supplied to the AC power supply ports OUT, out1, and out2, if the leakage current detector EL detects a leakage current, the control unit 4 does not stop the bidirectional charger 2 and switches the cutoff switches sw1 to sw4 from the conductive state to the cutoff state. Thereby, it is possible to prevent an unintended leakage current from flowing through the AC power supply ports OUT, out1, and out2.

[0046] Also, when power is supplied to the AC power supply port OUT, if the current detected by the current detection unit Si is equal to or greater than the current threshold Ith, the control unit 4 determines that an overcurrent abnormality has occurred in which a relatively large current is flowing through the AC power supply port OUT, and switches the cutoff switches sw1 and sw2 from the conductive state to the cutoff state, while maintaining the states of the cutoff switches sw3 and sw4. If the AC power supply ports out1 and out2 are in the power supply state, the cutoff switches sw3 and sw4 are maintained in the conductive state. Note that the current threshold Ith is a value based on the rated current of the AC power supply port OUT. Thereby, when a relatively large current flows through the AC power supply port OUT due to a short circuit abnormality or the like, the power supply to the AC power supply port OUT can be immediately stopped, and the power supply to the AC power supply ports out1 and out2 can be continued.

[0047] Also, when the control unit 4 supplies power to the AC power supply port out1, if the current detected by the current detection unit Si1 is equal to or greater than the current threshold Ith1, it determines that an overcurrent abnormality has occurred where a relatively large current is flowing through the AC power supply port out1, switches the cutoff switch sw3 from the conducting state to the cutoff state, and maintains the states of the cutoff switches sw1, sw2, and sw4. If the AC power supply ports OUT and out2 are in the power supply state, the cutoff switches sw1, sw2, and sw4 are maintained in the conducting state. Note that the current threshold Ith1 is a value based on the rated current of the AC power supply port out1. Thereby, when a relatively large current flows through the AC power supply port out1 due to a short circuit abnormality or the like, the power supply to the AC power supply port out1 can be immediately stopped, and the power supply to the AC power supply ports OUT and out2 can be continued.

[0048] Also, when the control unit 4 supplies power to the AC power supply port out2, if the current detected by the current detection unit Si2 is equal to or greater than the current threshold Ith2, it determines that an overcurrent abnormality has occurred where a relatively large current is flowing through the AC power supply port out2, switches the cutoff switch sw4 from the conducting state to the cutoff state, and maintains the states of the cutoff switches sw1 to sw3. If the AC power supply ports OUT and out1 are in the power supply state, the cutoff switches sw1 to sw3 are maintained in the conducting state. Note that the current threshold Ith2 is a value based on the rated current of the AC power supply port out2. Thereby, when a relatively large current flows through the AC power supply port out2 due to a short circuit abnormality or the like, the power supply to the AC power supply port out2 can be immediately stopped, and the power supply to the AC power supply ports OUT and out1 can be continued.

[0049] Also, when the control unit 4 supplies power to the AC power supply port OUT, if the voltage detected by the voltage detection unit Sv is equal to or higher than the voltage threshold Vth, it determines that an overvoltage abnormality has occurred where a relatively large voltage is applied to the AC power supply port OUT, and switches the cutoff switches sw1 and sw2 from the conducting state to the cutoff state, while maintaining the states of the cutoff switches sw3 and sw4. If the AC power supply ports out1 and out2 are in the power supply state, the cutoff switches sw3 and sw4 are maintained in the conducting state. Note that the voltage threshold Vth is a value based on the rated voltage of the AC power supply port OUT. Thereby, when a relatively large voltage is applied to the AC power supply port OUT due to a short-circuit abnormality or the like, the power supply to the AC power supply port OUT can be immediately stopped, and the power supply to the AC power supply ports out1 and out2 can be continued.

[0050] Also, when the control unit 4 supplies power to the AC power supply port out1, if the voltage detected by the voltage detection unit Sv1 is equal to or higher than the voltage threshold Vth1, it determines that an overvoltage abnormality has occurred where a relatively large voltage is applied to the AC power supply port out1, and switches the cutoff switch sw3 from the conducting state to the cutoff state, while maintaining the states of the cutoff switches sw1, sw2, and sw4. If the AC power supply ports OUT and out2 are in the power supply state, the cutoff switches sw1, sw2, and sw4 are maintained in the conducting state. Note that the voltage threshold Vth1 is a value based on the rated voltage of the AC power supply port out1. Thereby, when a relatively large voltage is applied to the AC power supply port out1 due to a short-circuit abnormality or the like, the power supply to the AC power supply port out1 can be immediately stopped, and the power supply to the AC power supply ports OUT and out2 can be continued.

[0051] Further, when the control unit 4 supplies power to the AC power supply port out2, if the voltage detected by the voltage detection unit Sv2 is equal to or higher than the voltage threshold Vth2, it determines that an overvoltage abnormality has occurred where a relatively high voltage is applied to the AC power supply port out2, and switches the cutoff switch sw4 from the conductive state to the cutoff state, while maintaining the states of the cutoff switches sw1 to sw3. If the AC power supply ports OUT and out1 are in the power supply state, the cutoff switches sw1 to sw3 are maintained in the conductive state. Note that the voltage threshold Vth2 is a value based on the rated voltage of the AC power supply port out2. Thereby, when a relatively high voltage is applied to the AC power supply port out2 due to a short circuit abnormality or the like, the power supply to the AC power supply port out2 can be immediately stopped, and the power supply to the AC power supply ports OUT and out1 can be continued.

[0052] As described above, in the in-vehicle power supply system 1 of the embodiment, the power distribution circuit and the leakage detector EL are provided not in the bidirectional charger 2 but in the newly provided distribution board 3, and the bidirectional charger 2 has only a power conversion function.

[0053] Thereby, even if the configuration of the power distribution circuit and the leakage detector EL changes due to a change in the number or rated voltage of the AC power supply ports, it is not necessary to change the configuration of the bidirectional charger 2, so that the bidirectional charger 2 can be made common. Further, since the rated power of the components (for example, current transformers) used in the leakage detector EL can be adjusted to the rated power of the AC power supply ports OUT, out1, and out2, which is lower than the DC power supplied to the in-vehicle battery B, compared with the case where the leakage detector EL is provided in the bidirectional charger 2, the increase in the size of the components used in the leakage detector EL can be suppressed, and the increase in the size of the in-vehicle power supply system 1 can be suppressed.

[0054] Further, in the in-vehicle power supply system 1 of the embodiment, a voltage detection unit Sv and a current detection unit Si are provided for the AC power supply port OUT, a voltage detection unit Sv1 and a current detection unit Si1 are provided for the AC power supply port out1, and a voltage detection unit Sv2 and a current detection unit Si2 are provided for the AC power supply port out2.

[0055] Accordingly, based on the voltage detected by the voltage detection units Sv, Sv1, Sv2 or the current detected by the current detection units Si, Si1, Si2, it is possible to determine whether an overvoltage abnormality or an overcurrent abnormality has occurred at each of the AC power supply ports OUT, out1, and out2.

[0056] In addition, in the in-vehicle power supply system 1 of the embodiment, cutoff switches sw1 and sw2 are provided between the external power supply side wiring Lp and the AC power supply port OUT, cutoff switch sw3 is provided between the external power supply side wiring Lp and the AC power supply port out1, and cutoff switch sw4 is provided between the external power supply side wiring Lp and the AC power supply port out2.

[0057] Accordingly, since the external power supply side wiring Lp and the AC power supply ports OUT, out1, and out2 can be selectively conducted or cut off according to the situation where an abnormality has occurred and the user's demands, the degree of freedom of the power distribution function in the distribution board 3 can be increased compared to the case where current limiting is performed collectively upstream of the AC power supply ports OUT, out1, and out2.

[0058] In addition, in the in-vehicle power supply system 1 of the embodiment, the charging port IN is connected to the external power supply side wiring Lp via the distribution board 3.

[0059] Accordingly, since there is no need to provide connection terminals or the like for connecting the charging port IN in the external power supply side wiring Lp, the external power supply side wiring Lp can be shared.

[0060] Here, FIG. 2 is a diagram showing an example of the bidirectional charger 2.

[0061] The bidirectional charger 2 shown in FIG. 2 includes an AC-DC conversion circuit 21, a capacitor C1, and a DC-DC conversion circuit 22.

[0062] The AC-DC conversion circuit 21 includes inductors L1, L2, and switching elements Q1 to Q6. The switching elements Q1 to Q6 are each constituted by, for example, a MOSFET (Metal Oxide Semiconductor Field-Effect Transistor). Further, the switching elements Q5 and Q6 may each be replaced with a capacitor.

[0063] One terminal of the inductor L1 is connected to the voltage line Lv1 of the external power supply side wiring Lp, and the other terminal of the inductor L1 is connected to the connection point between the source terminal of the switching element Q3 and the drain terminal of the switching element Q4. One terminal of the inductor L2 is connected to the voltage line Lv2 of the external power supply side wiring Lp, and the other terminal of the inductor L2 is connected to the connection point between the source terminal of the switching element Q1 and the drain terminal of the switching element Q2. The connection point between the source terminal of the switching element Q5 and the drain terminal of the switching element Q6 is connected to the neutral line LvN of the external power supply side wiring Lp. The drain terminals of the switching elements Q1, Q3, and Q5 are each connected to one terminal of the capacitor C1, and the source terminals of the switching elements Q2, Q4, and Q6 are each connected to the other terminal of the capacitor C1.

[0064] The capacitor C1 is connected between the AC-DC conversion circuit 21 and the DC-DC conversion circuit 22.

[0065] The DC-DC conversion circuit 22 is a so-called DAB (Dual Active Bridge) circuit, and includes a transformer T, switching elements Q7 to Q10 that constitute the primary side bridge circuit of the transformer T, switching elements Q11 to Q14 that constitute the secondary side bridge circuit of the transformer T, and a capacitor C2. The switching elements Q7 to Q14 are each constituted by, for example, a MOSFET.

[0066] The drain terminals of the switching elements Q7 and Q9 are each connected to one terminal of the capacitor C1, and the source terminals of the switching elements Q8 and Q10 are each connected to the other terminal of the capacitor C1. The connection point between the source terminal of the switching element Q7 and the drain terminal of the switching element Q8 is connected to one terminal of the primary coil Lt1 of the transformer T, and the connection point between the source terminal of the switching element Q9 and the drain terminal of the switching element Q10 is connected to the other terminal of the primary coil Lt1. The drain terminals of the switching elements Q11 and Q13 are each connected to one terminal of the capacitor C2, and the source terminals of the switching elements Q12 and Q14 are each connected to the other terminal of the capacitor C2. The connection point between the source terminal of the switching element Q11 and the drain terminal of the switching element Q12 is connected to one terminal of the secondary coil Lt2 of the transformer T, and the connection point between the source terminal of the switching element Q13 and the drain terminal of the switching element Q14 is connected to the other terminal of the secondary coil Lt2. One terminal of the capacitor C2 is connected to the positive terminal of the in-vehicle battery B, and the other terminal of the capacitor C2 is connected to the negative terminal of the in-vehicle battery B.

[0067] In addition, a desired current sensor and voltage sensor (not shown) are arranged in the bidirectional charger 2, and the control unit 4 controls the operations of the AC-DC conversion circuit 21 and the DC-DC conversion circuit 22 according to the measured values thereof.

[0068] When charging the in-vehicle battery B, the control unit 4 controls the operations of the AC-DC conversion circuit 21 and the DC-DC conversion circuit 22 so that the AC power input from the external power supply side wiring Lp is converted into DC power and supplied to the in-vehicle battery B. Also, when supplying power to the AC power supply ports OUT, out1, and out2, the control unit 4 controls the operations of the AC-DC conversion circuit 21 and the DC-DC conversion circuit 22 so that the DC power output from the in-vehicle battery B is converted into AC power and supplied to the external power supply side wiring Lp.

[0069] For example, when charging the in-vehicle battery B, the control unit 4 controls the driving of the switching elements Q1 to Q4 so that the power factor approaches 1. Thereby, the rectified power with an improved power factor by the AC-DC conversion circuit 21 is supplied to the capacitor C1. The capacitor C1 smoothes the power rectified by the AC-DC conversion circuit 21. That is, when charging the in-vehicle battery B, the AC power input from the external power supply side wiring Lp is converted into DC power by the AC-DC conversion circuit 21 and the capacitor C1 and output to the DC-DC conversion circuit 22.

[0070] Further, when charging the in-vehicle battery B, the control unit 4 controls the driving of the switching elements Q7 to Q14 so that the DC power converted by the AC-DC conversion circuit 21 and the capacitor C1 is converted into the target DC power.

[0071] Also, when feeding power to the AC power supply ports OUT, out1, and out2, the control unit 4 controls the driving of the switching elements Q7 to Q14 so that the DC power output from the in-vehicle battery B is converted into a predetermined DC power and input to the AC-DC conversion circuit 21 via the capacitor C1.

[0072] Also, when feeding power to the AC power supply ports OUT, out1, and out2, the control unit 4 controls the driving of the switching elements Q1 to Q6 so that the predetermined DC power output from the DC-DC conversion circuit 22 is converted into first and second AC powers, the first AC power is output to the voltage line Lv1 and the neutral line LvN, and the second AC power is output to the voltage line Lv2 and the neutral line LvN. Note that the bidirectional charger 2 is not limited to the configuration of FIG. 2, and a charging circuit that operates only in the direction of converting the alternating current input to the external power supply side wiring Lp into direct current and charging the in-vehicle battery B, and a DC-AC conversion circuit that operates only in the direction of converting the DC power of the in-vehicle battery B into alternating current and outputting it to the external power supply side wiring Lp may be connected in parallel to function as the bidirectional charger 2 as a whole.

[0073] Note that the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the gist of the present invention.

[0074] <Modification Example 1> FIG. 3 is a diagram showing Modification Example 1 of the in-vehicle power feeding system 1 of the embodiment. In FIG. 3, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

[0075] In the in-vehicle power feeding system 1 shown in FIG. 3, the difference from the in-vehicle power feeding system 1 shown in FIG. 1 is that the charging port IN is directly connected to the external power supply side wiring Lp without passing through the distribution board 3.

[0076] When configured in this way, the changeover switches SW1 and SW2 shown in FIG. 1 can be omitted.

[0077] Also, in the in-vehicle power feeding system 1 shown in FIG. 3, similar to the in-vehicle power feeding system 1 shown in FIG. 1, since there is no need to change the configuration of the bidirectional charger 2, the bidirectional charger 2 can be made common.

[0078] <Modification Example 2> FIG. 4 is a diagram showing Modification Example 2 of the in-vehicle power feeding system 1 of the embodiment. In FIG. 4, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

[0079] In the in-vehicle power supply system 1 shown in Fig. 4, the difference from the in-vehicle power supply system 1 shown in Fig. 1 is that the configuration of the power distribution circuit (cut-off switch and changeover switch) of the distribution board 3 is changed so that power can be supplied to the AC power supply port OUT or the AC power supply ports out1 and out2 during charging of the in-vehicle battery B. That is, in the in-vehicle power supply system 1 shown in Fig. 4, while charging the in-vehicle battery B using the AC power output from the external power supply P, it is also possible to supply power to the AC power supply port OUT or the AC power supply ports out1 and out2. Note that in the power distribution circuit of the distribution board 3 shown in Fig. 4, cut-off switches sw5 and sw6 are provided instead of the changeover switches SW1 and SW2, a changeover switch SW3 is provided instead of the cut-off switch sw4, and a cut-off switch sw7 and a charging voltage detection unit SV are newly provided. Also, in the in-vehicle power supply system 1 shown in Fig. 4, similar to the in-vehicle power supply system 1 shown in Fig. 1, the cut-off switches sw1, sw2, sw3, sw5, sw6, and sw7 may selectively conduct or cut off the AC power supply ports OUT, out1, out2 and the charging port IN according to the situation where an abnormality has occurred or the user's request.

[0080] The cut-off switches sw5 and sw6 are constituted by, for example, electromagnetic relays of a contact a or a contact b. The cut-off switch sw5 is connected between the voltage line Lv1 of the external power supply side wiring Lp and one terminal of the charging port IN, and the cut-off switch sw6 is connected between the voltage line Lv2 of the external power supply side wiring Lp and the other terminal of the charging port IN. When the cut-off switches sw5 and sw6 are controlled to be in the conductive state by the control unit 4, the charging port IN and the external power supply side wiring Lp (voltage lines Lv1 and Lv2) are connected to each other, and when they are controlled to be in the cut-off state by the control unit 4, the charging port IN and the external power supply side wiring Lp (voltage lines Lv1 and Lv2) are electrically cut off. The voltage line Lv1 and the voltage line Lv2 are connected to each AC power supply port side without passing through the cut-off switches sw5 and sw6. Therefore, each AC power supply port can be connected to the bidirectional charger 2 and the charging port IN at the same time. Note that either one of the cut-off switches sw5 and sw6 may be omitted.

[0081] The changeover switch SW3 is constituted by, for example, an electromagnetic relay of c contacts, and is connected between the other terminal of the charging port IN, the other terminal of the AC power supply port out1, and one terminal of the AC power supply port out2 via the cutoff switch sw6. The operation of the changeover switch SW3 is controlled by the control unit 4, so as to connect the other terminal of the charging port IN to the other terminals of the AC power supply ports out1 and out2 to each other via the cutoff switch sw6, or to connect the other terminal of the charging port IN to one terminal of the AC power supply port out2 to each other. That is, the changeover switch SW3 switches, via the cutoff switch sw6, the connection destination of the other terminal of the charging port IN to either one of the other terminals of the AC power supply ports out1 and out2 and one terminal of the AC power supply port out2.

[0082] The cutoff switch sw7 is constituted by, for example, an electromagnetic relay of a contacts or b contacts, and is connected between one terminal of the AC power supply port out1 and one terminal of the AC power supply port out2. When the cutoff switch sw7 is controlled to be in a conductive state by the control unit 4, it connects one terminal of the AC power supply port out1 to one terminal of the AC power supply port out2 to each other, and when it is controlled to be in a cutoff state by the control unit 4, it electrically cuts off one terminal of the AC power supply port out1 from one terminal of the AC power supply port out2.

[0083] The charging voltage detection unit SV is constituted by, for example, a voltage dividing resistor or the like. The charging voltage detection unit SV detects the voltage applied to the charging port IN when the cutoff switches sw5 and sw6 are in a conductive state and AC power is supplied from the external power supply P to the charging port IN, and sends the detected voltage to the control unit 4. Note that the charging voltage detection unit SV may be provided in the bidirectional charger 2.

[0084] <Example of the operation of the control unit 4 when feeding power to the AC power supply port OUT during charging of the in-vehicle battery B> When a charging instruction for in - vehicle battery B and a power supply instruction to the AC power supply port OUT are input, and the AC voltage detected by the charging voltage detection unit SV is the voltage corresponding to the AC power supply port OUT (for example, the rated voltage of the AC power supply port OUT (AC 200 [V])), the control unit 4 turns on the cutoff switches sw1, sw2, sw5, sw6, turns off the cutoff switches sw3, sw7, and connects the other terminal of the charging port IN to the other terminals of the AC power supply ports out1, out2 respectively by the change - over switch SW3. Also, the control unit 4 causes the bidirectional charger 2 to convert the AC power output from the external power supply P into DC power and supply it to the in - vehicle battery B. Thereby, the in - vehicle battery B can be charged using the AC power output from the external power supply P, and power can be supplied to the AC power supply port OUT.

[0085] <Example of the operation of the control unit 4 when supplying power to the AC power supply ports out1, out2 during charging of the in - vehicle battery B> When a charging instruction for in - vehicle battery B and a power supply instruction to the AC power supply ports out1, out2 are input, and the AC voltage detected by the charging voltage detection unit SV is the voltage corresponding to the AC power supply ports out1, out2 (for example, the rated voltage of the AC power supply ports out1, out2 (AC 100 [V])), the control unit 4 turns on the cutoff switches sw3, sw5, sw6, sw7, turns off the cutoff switches sw1, sw2, and connects the other terminal of the charging port IN to the other terminals of the AC power supply ports out1, out2 respectively by the change - over switch SW3. Also, the control unit 4 causes the bidirectional charger 2 to convert the AC power output from the external power supply P into DC power and supply it to the in - vehicle battery B. Thereby, the in - vehicle battery B can be charged using the AC power output from the external power supply P, and power can be supplied to the AC power supply ports out1, out2.

[0086] <Modification 3> FIG. 5 is a diagram showing Modification 3 of the in - vehicle power supply system 1 of the embodiment. In FIG. 5, the same components as those shown in FIG. 4 are denoted by the same reference numerals, and their descriptions are omitted.

[0087] In the in - vehicle power supply system 1 shown in FIG. 5, the difference from the in - vehicle power supply system 1 shown in FIG. 4 is that the distribution board 3 is further provided with a voltage conversion circuit CNV.

[0088] The voltage conversion circuit CNV steps down and converts the external input AC voltage (for example, AC 200 [V]) output from the external power supply P to a converted AC voltage (for example, AC 100 [V]).

[0089] The power distribution circuit of the distribution board 3 shown in FIG. 5 outputs the external input AC voltage to the AC power supply port OUT, and outputs the converted AC voltage output from the voltage conversion circuit CNV to the AC power supply ports out1 and out2.

[0090] <Example of the operation of the control unit 4 when power is supplied to the AC power supply ports OUT and out1 during charging of the in - vehicle battery B> When an instruction to charge the in - vehicle battery B and an instruction to supply power to the AC power supply ports OUT and out1 are input, and the voltage detected by the charging voltage detection unit SV is the voltage corresponding to the AC power supply port OUT (for example, the rated voltage of the AC power supply port OUT (AC 200 [V])), the control unit 4 makes the cutoff switches sw1, sw2, sw3, sw5, sw6 in the conductive state, makes the cutoff switch sw7 in the cutoff state, and connects the other terminal of the charging port IN and the other terminal of the AC power supply port out1 by the change - over switch SW3. Also, the control unit 4 causes the bidirectional charger 2 to convert the AC power output from the external power supply P into DC power and supply it to the in - vehicle battery B, and causes the voltage conversion circuit CNV to convert the AC voltage of AC 200 [V] output from the external power supply P into an AC voltage of AC 100 [V] and output it to the AC power supply port out1. Thereby, the in - vehicle battery B can be charged using the AC power output from the external power supply P, the AC voltage output from the external power supply P can be output to the AC power supply port OUT, and the AC voltage output from the voltage conversion circuit CNV can be output to the AC power supply port out1.

[0091] <Example of the operation of the control unit 4 when power is supplied to the AC power supply ports OUT, out1, and out2 during charging of the in - vehicle battery B> When a charging instruction for the in-vehicle battery B and a power supply instruction to the AC power supply ports OUT, out1, and out2 are input, and the voltage detected by the charging voltage detection unit SV is the voltage corresponding to the AC power supply port OUT (for example, the rated voltage of the AC power supply port OUT (AC 200 [V])), the cutoff switches sw1, sw2, sw3, sw5, sw6, and sw7 are turned on, and the switching switch SW3 connects the other terminal of the charging port IN to the other terminals of the AC power supply ports out1 and out2, respectively. Further, the control unit 4 causes the bidirectional charger 2 to convert the AC power output from the external power supply P into DC power and supply it to the in-vehicle battery B, and causes the voltage conversion circuit CNV to convert the AC voltage of AC 200 [V] output from the external power supply P into an AC voltage of AC 100 [V] and output it to the AC power supply ports out1 and out2, respectively. Thereby, the in-vehicle battery B can be charged using the AC power output from the external power supply P, the AC voltage output from the external power supply P can be output to the AC power supply port OUT, and the AC voltage output from the voltage conversion circuit CNV can be output to the AC power supply ports out1 and out2, respectively.

[0092] Also in the in-vehicle power supply system 1 shown in FIG. 5, since it is not necessary to change the configuration of the bidirectional charger 2 as in the in-vehicle power supply system 1 shown in FIG. 1, the bidirectional charger 2 can be made common.

[0093] <Modification Example 4> In the in-vehicle power supply system 1 in Modification Example 4, the in-vehicle battery B is charged using the AC power output from the external power supply P, and the AC power supply ports OUT, out1, and out2 are supplied with power using the DC power output from the in-vehicle battery B. Note that the configuration of the in-vehicle power supply system 1 in Modification Example 4 is the same as the configuration of Modification Example 2 of the in-vehicle power supply system 1 shown in FIG. 4. In Modification Example 2, the bidirectional charger 2 only charges the in-vehicle battery B, and the AC power supply to each AC power supply port is performed by the AC power input from the external power supply P to the charging port IN. However, in Modification Example 4, the bidirectional charger 2 charges the in-vehicle battery B and also supplies AC power to each AC power supply port, which is different.

[0094] In the fourth modification, the bidirectional charger 2 converts the AC power input from the external power supply side wiring Lp into DC power and supplies it to the in-vehicle battery B, and also converts the DC power output from the in-vehicle battery B into first AC power (for example, AC 200 [V]) and second AC power (for example, AC 100 [V]) and supplies it to the external power supply side wiring Lp. That is, a single-phase three-wire AC is supplied so as to supply an AC voltage of AC 200 [V] between the voltage line Lv1 and the voltage line Lv2, supply an AC voltage of AC 100 [V] between the voltage line Lv1 and the neutral line LvN, and supply an AC voltage of AC 100 [V] between the voltage line Lv2 and the neutral line LvN.

[0095] The power distribution circuit of the distribution board 3 in the fourth modification supplies the first AC power input from the external power supply side wiring Lp to the AC power supply port OUT, and also supplies the second AC power input from the external power supply side wiring Lp to the AC power supply ports out1 and out2 respectively.

[0096] <Example of the operation of the control unit 4 when supplying power to the AC power supply ports OUT, out1, and out2 during charging of the in-vehicle battery B> When a charging instruction for the in-vehicle battery B and a power supply instruction to the AC power supply ports OUT, out1, and out2 are input, the control unit 4 turns on the cutoff switches sw1, sw2, sw3, sw5, and sw6, turns off the cutoff switch sw7, and connects the voltage line Lv2 of the external power supply side wiring Lp and one terminal of the AC power supply port out2 by the changeover switch SW3. Further, the control unit 4 causes the bidirectional charger 2 to convert the AC power output from the external power supply P into DC power and supply it to the in-vehicle battery B, and converts the DC power output from the in-vehicle battery B into first and second AC powers, supplies the first AC power to the AC power supply port OUT, and supplies the second AC power to the AC power supply ports out1 and out2, respectively. Thereby, the in-vehicle battery B can be charged using the AC power output from the external power supply P, and power can be supplied to the AC power supply ports OUT, out1, and out2 using the DC power output from the in-vehicle battery B. When it is desired to supply power only to a specific AC power supply port, the corresponding cutoff switch may be turned off (in the case of the AC power supply port out2, the changeover switch SW3 is connected to the other terminal).

[0097] Also in the in-vehicle power supply system 1 of Modification 4, since it is not necessary to change the configuration of the bidirectional charger 2 as in the in-vehicle power supply system 1 shown in FIG. 1, the bidirectional charger 2 can be made common.

Explanation of Reference Numerals

[0098] 1 In-vehicle power supply system 2 Bidirectional charger 3 Distribution board 4 Control unit IN Charging port OUT, out1, out2 AC power supply ports Lb In-vehicle battery side wiring Lp External power supply side wiring P External power supply B In-vehicle battery SW1~SW3 Changeover switches sw1~sw7 Cutoff switches EL Leakage detector Si, Si1, Si2 Current detection units Sv, Sv1, Sv2, SV voltage detection unit

Claims

1. A charging port, an external power supply side wiring connected to the charging port, and an in-vehicle battery side wiring, which converts AC power input from an external power supply through the charging port and the external power supply side wiring into DC power, and supplies the DC power to the in-vehicle battery through the in-vehicle battery side wiring, or converts DC power input from the in-vehicle battery through the in-vehicle battery side wiring into AC power, and supplies the AC power to the external power supply side wiring; a bidirectional charger, an AC power supply port, a distribution board including a power distribution circuit that distributes AC power input from the external power supply side wiring to the AC power supply port, and a leakage detector that detects leakage, a control unit that controls the operation of the bidirectional charger, and an in-vehicle power supply system comprising the same.

2. The in-vehicle power supply system according to claim 1, comprising a plurality of the AC power supply ports, wherein the power distribution circuit distributes AC power input from the external power supply side wiring to the plurality of AC power supply ports, and the distribution board comprises a voltage detection unit or a current detection unit corresponding to each of the plurality of AC power supply ports. An in-vehicle power supply system.

3. The in-vehicle power supply system according to claim 1, comprising a plurality of the AC power supply ports, wherein the distribution board comprises a plurality of cutoff switches connected between the plurality of AC power supply ports and the external power supply side wiring or the charging port. An in-vehicle power supply system.

4. The in-vehicle power supply system according to claim 1, wherein the charging port is connected to the external power supply side wiring through the distribution board. An in-vehicle power supply system.

5. The in-vehicle power supply system according to claim 1, comprising a plurality of the AC power supply ports, a charging voltage detection unit that detects the voltage input from the charging port, and wherein the control unit supplies AC power input from the charging port to the AC power supply port corresponding to the voltage detected by the charging voltage detection unit among the plurality of AC power supply ports. An in-vehicle power supply system.

6. The in-vehicle power supply system according to claim 1, comprising a first and a second AC power supply ports, wherein the distribution board comprises a voltage conversion circuit that converts an external input AC voltage input from the charging port into a converted AC voltage, and the power distribution circuit outputs the external input AC voltage to the first AC power supply port and outputs the converted AC voltage output from the voltage conversion circuit to the second AC power supply port. An in-vehicle power supply system.

7. The in-vehicle power supply system according to claim 1, comprising a first and a second AC power supply ports, ​ The bidirectional charger converts the DC power input from the external power supply side wiring into AC power and supplies it to the in-vehicle battery, and also converts the DC power output from the in-vehicle battery into first and second AC powers and supplies them to the external power supply side wiring. The power distribution circuit supplies the first AC power input from the external power supply side wiring to the first AC power supply port, and supplies the second AC power input from the external power supply side wiring to the second AC power supply port. In-vehicle power supply system.

Images