Power supply system

Abstract

This enables the vehicle to supply power to loads with different voltages. [Solution] The power supply system 100 converts the DC power from the vehicle's traction battery 310 into AC power and supplies it to loads 7 and 8. The power converter 13 converts the DC power from the traction battery 310 into AC 200V (first voltage) AC power and supplies it to load 8 via a switch 22 installed in the first power path PL1v. The transformer 9 installed in the second power path PLv2 transforms the AC 200V AC power output from the power converter 13 into AC 100V (second voltage) and supplies it to load 7 via a switch 12.

Description

Technical Field

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

Background Art

[0002] Japanese Patent Application Laid-Open No. 2019-71721 (Patent Document 1) discloses a power supply system that can utilize the power stored in an electric vehicle when a power grid (grid power source) experiences a power outage.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Although not specified in the above Patent Document 1, the power load may include a first load operated by a first voltage and a second load operated by a second voltage. In this case, it is desirable that the power stored in the vehicle can be supplied to the first load and the second load.

[0005] An object of the present disclosure is to enable power to be supplied from a vehicle to loads with different voltages.

Means for Solving the Problems

[0006] The power supply system of this disclosure is a power supply system that supplies power stored in a power storage device mounted on a vehicle to a power load outside the vehicle. The power load of the power supply system includes a first load that operates on a first voltage and a second load that operates on a second voltage different from the first voltage. The power supply system comprises a power converter that converts the DC power of the power storage device into AC power of the first voltage, a first power path that supplies the AC power output from the power converter to the first load via a first switch, a transformer that transforms the AC power output from the power converter to a second voltage, and a second power path that supplies the AC power output from the transformer to the second load via a second switch. [Effects of the Invention]

[0007] According to this disclosure, a vehicle can supply power to loads with different voltages. [Brief explanation of the drawing]

[0008] [Figure 1] This is a circuit block diagram showing the configuration of the power supply system according to this embodiment. [Modes for carrying out the invention]

[0009] The embodiments of this disclosure will be described in detail below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and their descriptions will not be repeated.

[0010] Figure 1 is a circuit block diagram showing the configuration of the power supply system 100 according to this embodiment. The power supply system 100 comprises a house 110, a grid power supply 200, and a vehicle 300. In this embodiment, the grid power supply 200 is capable of transmitting AC 100V and AC 200V. The vehicle 300 has an output voltage of 200V when powered. Therefore, the power converter 13 (described later) connected to the vehicle 300 outputs AC 200V. Note that 200V and 100V are examples of the "first voltage" and "second voltage" as described herein.

[0011] The power supply system 100 supplies power from the grid power source 200 to the loads of the house 110. The house 110 is typically a residence (a building where people live). However, the house 110 may also include buildings that are not for residential use, such as office buildings or buildings housing equipment. The loads are, for example, various electrical appliances, which may be located inside (indoors) or outside (outdoors) the house 110.

[0012] The power supply system 100 includes an energy meter 1, a main breaker 2, a ground fault circuit interrupter 3, overcurrent breakers 4, 5, and 6, loads 7 and 8, a transformer 9, a charging switch 10, switches 11, 12, 21, and 22, a power converter 13, a resistive element 14, and a controller 400. The number of overcurrent breakers is not particularly limited. Switches 12 and 22 are examples of the “second switch” and “first switch” of this disclosure, respectively. Loads 7 and 8 are “power loads” and are examples of the “second load” and “first load” of this disclosure, respectively. The transformer 9 corresponds to an example of the “voltage transformer” of this disclosure.

[0013] The controller 400 is a computer device including a processor 401 and memory 402, and is, for example, a HEMS (Home Energy Management System) controller. The controller 400 outputs control commands to open and close (switch on / off) each of the switches 11, 12, 21, 22 and the charging switch 10.

[0014] The electricity meter 1 receives AC power from the grid power supply 200 to the house 110. The main breaker 2 interrupts the circuit when it detects an abnormality (overcurrent) in the current capacity flowing from the grid power supply 200. The earth leakage circuit breaker 3 interrupts the circuit when it detects an earth leakage. The electricity meter 1, the main breaker 2, and the earth leakage circuit breaker 3 constitute the current circuit breaker 120.

[0015] The current circuit breaker 120 is connected to a circuit PL2 for transmitting AC100V alternating current power and a circuit PL1 for transmitting AC200V alternating current power.

[0016] The overcurrent breaker 4 is electrically connected to the AC100V circuit PL2. Although not shown in the diagram, the house 110 includes multiple rooms. Each of these rooms is equipped with a 100V load 7. Each of these rooms is also equipped with an overcurrent breaker 4. The overcurrent breaker 4 is configured to electrically interrupt the connection between the current circuit breaker 120 and the load 7 when an overcurrent is detected.

[0017] The overcurrent breaker 5 is electrically connected to the AC200V circuit PL1. Like the AC100V overcurrent breaker 4, the overcurrent breaker 5 is installed in each of the multiple rooms of the house 110. The overcurrent breaker 5 is configured to electrically interrupt the connection between the current circuit breaker 120 and the 200V load 8 when an overcurrent is detected. Note that in Figure 1, for simplification, only one load 8 (overcurrent breaker 5) is shown.

[0018] The power converter 13 is configured to be connected to the vehicle 300 via a power supply cable (not shown). The vehicle 300 is equipped with a traction battery 310. The traction battery 310 is an example of a “power storage device” in this disclosure. The traction battery 310 may be, for example, a lithium-ion battery. The traction battery 310 of the vehicle 300 is capable of exchanging power with the outside of the vehicle. The vehicle 300 may be, for example, an electric vehicle, and specifically a BEV (Battery Electric Vehicle) or a PHEV (Plug-in Hybrid Electric Vehicle).

[0019] The power conversion device 13 includes an AC / DC conversion device, and is configured to convert the DC power stored (accumulated) in the traveling battery 310 into AC 200V AC power and output it when the vehicle 300 (traveling battery 310) is connected. Also, the power conversion device 13 can convert the AC power supplied from the utility power supply 200 into DC power to charge the vehicle 300 (traveling battery 310).

[0020] The first end of the switch 11 is electrically connected to the current breaker 120. The second end of the switch 11 is electrically connected to the overcurrent breaker 4. Thereby, the switch 11 is configured to switch the electrical connection and disconnection between the current breaker 120 and the overcurrent breaker 4 (load 7) according to a control command from the controller 400.

[0021] The first end of the switch 21 is electrically connected to the current breaker 120. The second end of the switch 21 is electrically connected to the overcurrent breaker 5. Thereby, the switch 21 is configured to switch the electrical connection and disconnection between the current breaker 120 and the overcurrent breaker 5 (load 8) according to a control command from the controller 400.

[0022] The transformer 9 is arranged in the second power path PL2v between the power conversion device 13 and the switch 12. The first end of the switch 12 is electrically connected to the first end of the transformer 9. The second end of the transformer 9 is electrically connected to the power conversion device 13. The second end of the switch 12 is electrically connected to the overcurrent breaker 4. Thereby, the switch 12 is configured to switch the electrical connection and disconnection between the transformer 9 (power conversion device 13) and the overcurrent breaker 4 (load 7) according to a control command from the controller 400. Note that the transformer 9 transforms the AC 200V AC power output from the power conversion device 13 into AC 100V AC power.

[0023] Thus, when power is supplied from the vehicle 300, the output voltage of the vehicle 300 can be adjusted to a voltage (100 V) corresponding to the load 7 by the transformer 9. As a result, power can be supplied from the vehicle 300 (the driving battery 310) to loads (load 7, load 8) with different voltages. By shutting off (turning off) the switch 11 and connecting (turning on) the switch 12 according to a control command from the controller 400, the power stored in the vehicle 300 (the driving battery 310) can be supplied to the load 7 (100 V load) using the second power path PL2v.

[0024] Generally, large household appliances such as water heaters and air conditioners are included in the load 8 (200 V load), so the power demand (power consumption) is often smaller for the load 7 (100 V load) than for the load 8. Therefore, by arranging the transformer 9 in the second power path PL2v between the switch 12 on the load 7 side where the power demand is relatively small and the power conversion device 13, it is possible to make the capacity of the transformer 9 relatively small.

[0025] The first end of the switch 22 is electrically connected to the power conversion device 13 via the first power path PL1v. The second end of the switch 22 is electrically connected to the overcurrent breaker 5. Thereby, the switch 22 is configured to switch the electrical connection and disconnection between the power conversion device 13 and the overcurrent breaker 5 (load 8) according to a control command from the controller 400. By shutting off (turning off) the switch 21 and connecting (turning on) the switch 22 according to a control command from the controller 400, the power stored in the vehicle 300 (the driving battery 310) can be supplied to the load 8 (200 V load) using the first power path PL1v.

[0026] The resistance element 14 is a high-resistance element. The resistance element 14 is electrically connected to a circuit connecting the switch 22 and the power conversion device 13.

[0027] The first terminal of the charging switch 10 is electrically connected to the power converter 13. The second terminal of the charging switch 10 is electrically connected to the first terminal of the overcurrent breaker 6. The second terminal of the overcurrent breaker 6 is electrically connected to the second terminal of the switch 21. This makes it possible to charge the vehicle 300 with power supplied from the grid power supply 200 through the charging switch 10.

[0028] According to this embodiment, the power supply system 100 includes a power converter 13 that converts the DC power of the traction battery 310 into AC power of AC 200V (first voltage), a first power path PL1v that supplies the AC power of AC 200V output from the power converter 13 to the load 8 via a switch 22, a transformer 9 that transforms the AC power of AC 200V output from the power converter 13 to AC 100V (second voltage), and a second power path PL2v that supplies the AC power of AC 100V output from the transformer 9 to the load 7 via a switch 12.

[0029] When power is supplied from the vehicle 300, the output voltage (200V) of the power converter 13 can be adjusted by the transformer 9 to match the voltage (100V) corresponding to the load 7. As a result, power can be supplied from the vehicle 300 (driving battery 310) to loads with different voltages (load 7, load 8).

[0030] Alternatively, the output voltage of the power converter 13 may be supplied to the load 7 as AC100V AC power, and the transformer 9 may be used to transform AC100V to AC200V before supplying it to the load 8. Furthermore, the power converter 13 may be installed in the vehicle 300.

[0031] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of this disclosure is indicated by the claims rather than by the description of the embodiments above, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of symbols]

[0032] 4,5 Overcurrent breaker, 7 Load (second load), 8 Load (first load), 9 Transformer, 12 Switch (second switch), 13 Power converter, 22 Switch (first switch), 100 Power supply system, 110 House, 120 Current circuit breaker, 200 System power supply, 300 Vehicle, 310 Driving battery (energy storage device), 400 Controller, PL1v First power path, PL2v Second power path.

Claims

[Claim 1] A power supply system that supplies electricity stored in an onboard energy storage device to an external power load, The aforementioned power load is A first load that operates with a first voltage, The system includes a second load that operates on a second voltage different from the first voltage, A power conversion device that converts the DC power of the energy storage device into AC power of the first voltage, A first power path supplies AC power output from the power converter to the first load via a first switch, A transformer that transforms the AC power output from the power converter into the second voltage, A power supply system comprising: a second power path that supplies AC power output from the transformer to the second load via a second switch.

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