Power supply system

Abstract

To provide a power supply system capable of suppressing unauthorized power supply.SOLUTION: A power supply system 100 in a vehicle 10 equipped with a battery 11 includes a bidirectional charger 12 for charging the battery 11 and supplying power from the battery 11 to a load 30 and an ECU 13 for controlling the bidirectional charger 12. When power is supplied from the battery 11 to the load 30 by the bidirectional charger 12, an output current from the bidirectional charger 12 is in a state that is less than or equal to a predetermined value set in advance, and when the state in which the output current is less than or equal to the predetermined value continues for a predetermined time set in advance, the ECU 13 stops the bidirectional charger 12 and stops power supply to an external source.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a power supply system.

Background Art

[0002] Patent Document 1 discloses an electronic device that is wirelessly powered from a wireless power supply unit. In this electronic device, control means performs control for receiving wireless power when the electronic device is powered on under a situation where wireless power can be received, and stops wireless power supply when an average value during a certain period is equal to or less than a first set value. Further, in this electronic device, when the secondary battery is not fully charged in the power-off state, the output from the power receiving circuit that is wirelessly powered is continued and the output is stopped.

[0003] In recent years, in vehicles such as electric vehicles, hybrid vehicles, or fuel cell vehicles that can charge a battery with an external power source, it has been studied to supply power to external devices such as home appliances using the battery of this vehicle as a power supply source.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in the technology described in Patent Document 1, even if the power supply to the electronic device is stopped, the power supply unit side does not stop and continues to operate. Therefore, after the power supply to the electronic device is stopped, there is a risk that a third party may supply power to another electronic device without permission from the power supply unit.

[0006] Also, in the case of a system that supplies power from a vehicle battery to an external device, if the vehicle-side system does not stop even when power consumption by the external device stops, a third party can connect another external device to the vehicle connector and receive power supply.

[0007] Therefore, in various power supply systems, it is desirable to prevent a third party from receiving power supply without permission from the power supply source.

[0008] The present invention has been made in view of the above circumstances, and an object thereof is to provide a power supply system capable of suppressing unauthorized power supply.

Means for Solving the Problems

[0009] To achieve the above object, the power supply system of the present invention is a power supply system in a vehicle equipped with a battery, a bidirectional charger for charging the battery and supplying power from the battery to an external device, a control unit for controlling the bidirectional charger, and is provided with When the control unit supplies power from the battery to the external device by the bidirectional charger, the output current from the bidirectional charger becomes a state of being equal to or less than a preset specified value, and when the state of being equal to or less than the specified value of the output current continues for a preset specified time or more, the bidirectional charger is set to a stopped state and power supply to the outside is stopped.

[0010] According to the power supply system having this configuration, when the use of the external device receiving power supply stops, the power supply stops. As a result, even if a third party connects another external device after the use of the external device, power supply is not performed. That is, since the power supply is automatically stopped without operating the power supply system, unauthorized power supply by a third party can be suppressed.

Effects of the Invention

[0011] According to the present invention, a power supply system capable of suppressing unauthorized power supply can be provided.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0013] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of a power supply system 100 according to this embodiment.

[0014] As shown in FIG. 1, the power supply system 100 according to this embodiment is a power supply system capable of supplying power from the vehicle 10 to a load 30 which is an external device. The vehicle 10 is a vehicle that can be charged by an external power source such as an electric vehicle, a hybrid vehicle, or a fuel cell vehicle. The load 30 is an external device driven by electric power, for example, various household appliances.

[0015] Vehicle 10 includes a battery 11, a bidirectional charger 12, an ECU (control unit) 13, and a display 14. The vehicle 10 also has a receptacle 15, into which a power supply connector 20 is inserted and removed. A load 30 can be connected to this power supply connector 20. By connecting the load 30 to the power supply connector 20 inserted into the receptacle 15, the vehicle 10 and the load 30 are electrically connected, and a power supply system 100 capable of supplying power from the battery 11 of the vehicle 10 to the load 30 is configured. Note that a power source (not shown) such as commercial power can be connected to the vehicle 10 via the power supply connector 20, and the battery 11 of the vehicle 10 can also be charged from this power source.

[0016] The bidirectional charger 12 of the vehicle 10 is a charger for discharging from the battery 11 or charging the battery 11, and includes, for example, an inverter function for performing DC / AC conversion between the two. This bidirectional charger 12 includes an ammeter 16. This ammeter 16 detects the current value during charging and discharging between the vehicle 10 and an external load 30 or power source. The ECU 13 controls the bidirectional charger 12 and controls the charging and discharging of the battery 11. The display 14 displays various information such as the charging and discharging state, for example, according to a display signal from the ECU 13.

[0017] Next, the operation by the user and the power supply control by the ECU 13 in the above power supply system 100 will be described. Figure 2 is a flowchart for explaining the flow of operations by the user in the power supply system 100. Figure 3 is a flowchart for explaining the power supply control by the ECU 13 of the power supply system 100. Figure 4 is a schematic configuration diagram of the power supply system 100 with the load 30, which is an external device, removed.

[0018] The user inserts the power supply connector 20 into the receptacle 15 of the vehicle 10 for power supply from the vehicle 10 (step S01).

[0019] When the power supply connector 20 is inserted into the receptacle 15, a lock mechanism (not shown) of the receptacle 15 locks the power supply connector 20 (step S11). This suppresses the inadvertent removal of the power supply connector 20 during power supply.

[0020] The user performs a power supply start operation (step S02). Thereby, the power supply system 100 is activated (step S12). Then, the vehicle 10 has the ECU 13 prepare for power supply output (step S13).

[0021] The user connects a load 30 such as a household appliance to the power supply connector 20 (step S03). Thereby, the bidirectional charger 12 of the vehicle 10 and the load 30 are electrically connected. Then, the user starts driving the load 30 connected to the power supply connector 20 (step S04). Then, power from the battery 11 is supplied from the bidirectional charger 12 to the load 30, and the load 30 is driven.

[0022] In the vehicle 10, the monitoring state MO of the output current by the ECU 13 is entered when power supply to the load 30 starts.

[0023] In this monitoring state MO, first, the ECU 13 performs an output current determination (step S14). Specifically, based on the detection data from the ammeter 16, the output current value from the bidirectional charger 12 of the vehicle 10 is detected. Then, it is determined whether this output current is less than or equal to a preset specified value.

[0024] Here, in the output current determination (step S14), cases where the output current is less than or equal to the specified value include when the user stops driving the load 30 or changes / releases the connection of the load 30 to the power supply connector 20 (step S05). FIG. 4 shows a state where the connection of the load 30 to the power supply connector 20 is released.

[0025] When the ECU 13 determines in the output current determination that the output current is greater than the specified value (step S14: No), it continues power supply from the bidirectional charger 12 (step S15).

[0026] In contrast, when the ECU 13 determines that the output current is less than or equal to the specified value in the output current determination (step S14: Yes), it performs a low-output duration determination (step S16). Specifically, it measures the duration during which the output current from the bidirectional charger 12 is less than or equal to the specified value. Then, it determines whether this duration is equal to or longer than a preset specified time.

[0027] Here, in the low-output duration determination (step S16), cases where the state in which the output current is less than or equal to the specified value continues for the specified time or longer include cases where the driving of the load 30 has stopped or the state of changing / releasing the connection of the load 30 to the power supply connector 20 (see FIG. 4) (step S05) continues for the specified time or longer.

[0028] If the ECU 13 determines in the low-output duration determination that the state in which the output current is less than or equal to the specified value has not reached the specified time (step S16: No), it continues to supply power from the bidirectional charger 12 (step S15).

[0029] In contrast, if the ECU 13 determines in the low-output duration determination that the state in which the output current is less than or equal to the specified value is equal to or longer than the specified time (step S16: Yes), it releases the monitoring state MO and stops the power supply by the power supply system 100 (step S17).

[0030] When the power supply by the power supply system 100 is stopped, the lock of the power supply connector 20 by the lock mechanism of the receptacle 15 is released (step S18). As a result, it becomes possible to pull out the power supply connector 20 connected to the receptacle 15. In this state, the user pulls out the power supply connector 20 from the receptacle 15 of the vehicle 10 to end the power supply operation (step S06).

[0031] As described above, according to the power supply system 100 according to the present embodiment, when the use of the load 30, which is an external device receiving power supply, is stopped, the power supply is stopped. As a result, even if a third party connects another load 30 after the use of the load 30, power supply will not be provided. That is, since the power supply is automatically stopped without operating the power supply system 100, unauthorized power supply by a third party can be suppressed.

Explanation of Signs

[0032] 10 Vehicle 11 Battery 12 Bidirectional Charger 13 ECU (Control Unit) 30 Load (External Device) 100 Power Supply System

Claims

[Claim 1] A power supply system for a vehicle equipped with a battery, a bidirectional charger for charging the battery and supplying power from the battery to an external device; A control unit that controls the bidirectional charger; Equipped with when an output current from the bidirectional charger becomes equal to or less than a preset specified value during power supply from the battery to the external device by the bidirectional charger, and this state of the output current being equal to or less than the preset specified value continues for a preset specified time or more, the control unit brings the bidirectional charger into a stopped state and stops power supply to the outside. Power supply system.

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