Vehicle charging system

Abstract

To provide a vehicle charging system that can supply a vehicle with DC power in a space-saving manner without using an AC / DC converter.SOLUTION: The vehicle charging system includes: a multi-phase transformer 11 that converts high-voltage three-phase power 2 into low-voltage multi-phase power; a full wave rectification circuit 12 that converts the converted low-voltage multi-phase power into DC power; a DC / DC converter 31 that converts the DC power generated in the full wave rectification circuit 12 into a voltage suitable for charging of a vehicle 5; and a charging control unit 32 that communicates with the vehicle via a power supply connector 4 connected to the vehicle 5 to be charged to control the DC / DC converter.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a vehicle charging system, and more particularly to a vehicle charging system that generates DC power for vehicle charging from AC power received at high voltage and supplies it to the vehicle.

Background Art

[0002] Conventional vehicle charging systems convert the high-voltage power received by high-voltage power reception equipment such as cubicles to low voltage, convert the converted low-voltage AC power to DC using an AC / DC converter, and further convert it to a preferred voltage by a DC / DC converter (DC / DC power conversion device) and supply it to the vehicle (see, for example, Patent Document 1). On the other hand, when generating DC power from high-voltage power, there is a rectifying polyphase transformer that generates polyphase power in order to generate DC power with little ripple when converting high voltage to low voltage. For example, in Patent Document 2, a polyphase transformer is used to generate a low-voltage 12-phase AC voltage from high-voltage three-phase power, and a full-wave rectifier circuit is used to generate DC power without using an AC / DC converter.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventional vehicle charging systems required an AC / DC converter to obtain DC power for vehicle charging from the high-voltage received power as described above. Therefore, in addition to high-voltage power reception equipment such as cubicles, it was necessary to accommodate an AC / DC converter in a switchboard that supplies DC power to a charging stand equipped with a charging connector, etc., and a large installation space was required.

[0005] Therefore, in view of these problems, the present invention aims to provide a vehicle charging system that can supply DC power to a vehicle in a space-saving manner without using an AC / DC converter. [Means for solving the problem]

[0006] To solve the above problems, the invention of claim 1 is a vehicle charging system that converts high-voltage three-phase power to low-voltage DC power and supplies power to a vehicle to be charged, wherein high-voltage three-phase power is converted to low-voltage DC power 12 phase Convert to electricity 12 phase Transformer and converted low voltage 12 phase The system is characterized by comprising a full-wave rectifier circuit that converts electrical power to DC, a DC / DC power converter that converts the DC power generated by the full-wave rectifier circuit to a voltage suitable for vehicle charging, and a charging control unit that communicates with the vehicle via a power supply connector connected to the vehicle to be charged and controls the DC / DC power converter. According to this configuration, to generate low-voltage AC from high-voltage three-phase power: 12-phase voltage converter Because it uses a full-wave rectifier circuit, DC power can be generated without the need for an AC / DC converter as in conventional systems. Therefore, the entire system can be installed in a space-saving manner. Furthermore, by incorporating a charging control unit that communicates with the vehicle, charging control can be implemented according to the vehicle's energy storage status, enabling effective rapid charging.

[0007] The invention of claim 2 is characterized in that, in the configuration described in claim 1, it comprises at least one of a battery storage device and a solar power generation device as a distributed power source, the power of the distributed power source is input to a DC / DC power converter, and power from the multiple input power sources is output from the power supply connector. With this configuration, the power for charging the vehicle can be supplied not only from high-voltage three-phase power but also from a battery or solar power generation system, thus reducing the use of high-voltage three-phase power. [Effects of the Invention]

[0008] According to the present invention, since a multiphase transformer is used to generate low-voltage AC from high-voltage three-phase power, DC power can be generated with a full-wave rectifier circuit, eliminating the need for an AC / DC converter as in conventional systems. Therefore, the entire system can be installed in a space-saving manner. Furthermore, by incorporating a charging control unit that communicates with the vehicle, charging control can be implemented according to the vehicle's energy storage status, enabling effective rapid charging. [Brief explanation of the drawing]

[0009] [Figure 1] This is a configuration diagram showing an example of a vehicle charging system according to the present invention. [Figure 2] This is a diagram illustrating another example of a vehicle charging system. [Modes for carrying out the invention]

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Figure 1 is a configuration diagram showing an example of a vehicle charging system according to the present invention, where 1 is a high-voltage receiving equipment that converts high-voltage three-phase power 2 to DC, 3 is a rapid charger, and 4 is a power supply connector to which the vehicle to be charged is connected. Here, a system is shown that charges the vehicle 5 using only the high-voltage three-phase power 2 which is the power received, and a system is shown that has two power supply connectors 4 so that two vehicles 5 can be charged simultaneously.

[0011] The high-voltage power receiving equipment 1 includes a high-voltage cutout, a reactor, etc., but here only the power conversion device 1a, which includes a multiphase transformer 11 that generates low-voltage multiphase power and a full-wave rectifier circuit 12, is shown, which is the main part of the invention. The multiphase transformer 11 converts the 6600V high-voltage three-phase power into, for example, a 200V low-voltage twelve-phase power, and this multiphase power is converted to DC by the full-wave rectifier circuit 12 and output. For example, the transformer described in Patent Document 2 above can be used as the multiphase transformer 11, in which case a twelve-phase AC voltage is generated on the secondary side. This AC voltage is then converted to DC by the full-wave rectifier circuit 12. In this way, DC power is generated by the power conversion device 1a.

[0012] The rapid charger 3 includes a DC / DC converter 31 and a charging control unit 32 equipped with the CHAdeMO® protocol. The charging control unit 32 communicates with the vehicle 5 via the power supply connector 4 to set the charging current. The charging control unit 32 controls the voltage output by the DC / DC converter 31, i.e., the voltage output from the power supply connector 4, to charge the vehicle 5.

[0013] Thus, since a multiphase transformer 11 is used to generate low-voltage AC from high-voltage three-phase power 2, low-voltage power consisting of multiphase AC is generated, and a full-wave rectifier circuit 12 can generate DC power with low ripple. Therefore, it is not necessary to use an AC / DC converter as in conventional systems, and the entire system can be installed in a space-saving manner. Furthermore, by including a charging control unit 32 that communicates with the vehicle 5, charging control can be performed according to the battery storage status of the vehicle 5, enabling effective charging. Although the high-voltage power receiving equipment 1 and the rapid charger 3 are currently separate units, they could be integrated into a single unit. Integrating them would eliminate the need for a power cable connecting them.

[0014] Figure 2 is a diagram illustrating another configuration of the vehicle charging system, showing a configuration that uses not only high-voltage three-phase power but also distributed power sources for vehicle charging, unlike Figure 1. In Figure 2, 6 is a solar power generation device, 7 is a battery storage device, and 8 is a DC distribution board that integrates the power and sends it to the rapid charger 3. Components common to both Figure 1 and Figure 2 are given the same reference numerals and their explanations are omitted. Also, although there is one rapid charger 3 shown, there may be multiple units.

[0015] The solar power generation device 6 includes a solar cell panel 6a and a DC / DC converter 6b that adjusts the voltage output by the solar cell panel 6a. The battery storage device 7 includes a battery 7a and a DC / DC converter 7b that adjusts the voltage output by the battery 7a. Furthermore, the battery 7a is charged by the DC power output from the high-voltage power receiving equipment 1 or the power generated by the solar power generation device 6.

[0016] The DC distribution board 8 includes a switch (not shown) that opens and closes the connected individual circuits, collects the supplied power, and sends it to the rapid charger 3.

[0017] In addition, the DC / DC converter 6b of the solar power generation device 6 and the DC / DC converter 7b of the battery storage device 7 are cooperatively controlled with each other. For example, when the solar power generation power can supply all the power required by the rapid charger 3, the supply from the battery storage device 7 is stopped, and the power of the solar power generation device 6 is controlled to be supplied to the rapid charger 3. Also, the supply of solar power generation power is configured to be prioritized over the power of the high-voltage power receiving facility and supplied to the rapid charger 3. In a situation where the solar power generation power can cover vehicle charging, the supply of the high-voltage three-phase power 2 is also stopped or reduced (not described in detail).

[0018] In this way, for vehicle charging, in addition to the high-voltage three-phase power 2, the power from the solar power generation device 6 or the battery storage device 7 is also added, so the use of the high-voltage three-phase power 2 can be reduced.

[0019] In addition, the number of power supply connectors 4 (the number of rapid chargers) is arbitrary and is increased or decreased according to the capacity of the high-voltage power receiving facility 1 and the scale of the distributed power source. Also, as power sources for charging the vehicle 5, in addition to the high-voltage three-phase power 2, the solar power generation device 6 and the battery storage device 7 are shown, but the distributed power source may be a wind power generation device or a fuel cell power generation device. Furthermore, in addition to the rapid charger 3, a load that consumes power may be further connected to the DC distribution board 8. Furthermore, in the above embodiment, a plurality of power sources are collected by the DC distribution board 8 to generate power for vehicle charging, but the DC distribution board 8 may be configured as a DC microgrid.

Explanation of Reference Numerals

[0020] 1... High-voltage power receiving facility, 1a... Power conversion device, 2... High-voltage three-phase power, 3... Rapid charger, 4... Power supply connector, 5... Vehicle, 6... Solar power generation device, 7... Battery storage device, 8... DC distribution board, 11... Polyphase transformer, 12... Full-wave rectifier circuit, 31... DC / DC converter (DC / DC power conversion device), 32... Charging control unit.

Claims

1. A vehicle charging system that converts high-voltage three-phase power to low-voltage DC power and supplies power to the vehicle to be charged, A 12-phase transformer that converts high-voltage 3-phase power to low-voltage 12-phase power, A full-wave rectifier circuit that converts the converted low-voltage 12-phase power to DC, A DC / DC power converter that converts the DC power generated by the full-wave rectifier circuit into a voltage suitable for vehicle charging, A vehicle charging system characterized by comprising a charging control unit that communicates with the vehicle to be charged via a power supply connector connected to the vehicle and controls the DC / DC power converter.

2. It is equipped with at least one of a battery storage system and a solar power generation system as a distributed power source, The power from the distributed power source is input to the DC / DC power converter. The vehicle charging system according to claim 1, characterized in that power from multiple input power sources is output from the power supply connector.

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