Vehicle equipped with power supply system

Abstract

The invention provides a vehicle which is provided with a power supply system capable of operating an electrical device requiring a ground connection and eliminating the risk of electric shock due to contact with a vehicle body when an electric leakage occurs in the electrical device. A vehicle according to the present invention is characterized by being provided with: a power conversion device that converts input DC power into AC power and outputs the AC power; a three-pole socket having a ground terminal for supplying the AC power output by the power conversion device; and a leakage detection device that is inserted between the power conversion device and the three-pole socket, the ground terminal of the three-pole socket being connected to a cold ground-side wire that connects the power conversion device and the leakage detection device.

Description

Technical Field

[0001] The present invention relates to a vehicle having a power supply system with an AC socket for power supply. Background Technology

[0002] Patent Document 1 discloses a vehicle capable of supplying power to electrical equipment using an on-board battery as a power source. In this vehicle, the grounding terminal of a three-pole socket, which serves as a grounding terminal for a power supply port, is grounded to the vehicle body (vehicle body grounding).

[0003] Patent Document 1: Japanese Patent No. 7524863 Summary of the Invention

[0004] When a three-pole plug with a grounding terminal is connected to a three-pole socket with its grounding terminal grounded to the vehicle body, even if a leakage occurs in an electrical device supplied with power via the three-pole plug, the current can be discharged to the vehicle body through the grounding terminal (grounding) of the three-pole socket (forming a closed circuit), thus preventing electric shock. However, when a two-pole plug without a grounding terminal is connected to a three-pole socket with its grounding terminal grounded to the vehicle body, the following problem arises: if a leakage occurs in an electrical device supplied with power via the two-pole plug, a risk of electric shock arises between the plug and the vehicle body.

[0005] As a countermeasure to this risk of electric shock, one could consider not grounding the vehicle's power supply system to the vehicle body so that a closed circuit is not formed when electrical equipment leaks current. However, there are devices in the electrical equipment that will stop operating if they detect that the ground connection is not connected, thus creating a new problem (reduced convenience) that is different from the risk of electric shock.

[0006] The present invention was made in view of the above-mentioned problems, and its object is to provide a vehicle equipped with a power supply system that enables electrical equipment that requires grounding connection to operate, while eliminating the risk of electric shock due to contact with the vehicle body when leakage occurs in the electrical equipment.

[0007] To address the aforementioned issues, one aspect of the present invention is a vehicle characterized by comprising: a power conversion device that converts input DC power into AC power and outputs it; a three-pole socket having a grounding terminal for supplying the AC power output by the power conversion device; and a leakage current detection device inserted between the power conversion device and the three-pole socket, wherein the grounding terminal of the three-pole socket is connected to a cold ground wire that connects the power conversion device and the leakage current detection device.

[0008] Invention Effects

[0009] According to the vehicle of the present invention, electrical equipment that requires grounding connection can be operated, while eliminating the risk of electric shock due to contact with the vehicle body when leakage occurs in the electrical equipment. Attached Figure Description

[0010] Figure 1 This is a schematic structural diagram of the power supply system and its surrounding parts of a vehicle according to an embodiment of the present invention.

[0011] Figure 2 This is a reference example of a power supply system designed to form a closed circuit. Detailed Implementation

[0012] <Implementation Method>

[0013] [structure]

[0014] Figure 1 This is a structural diagram showing an outline of the power supply system 100 and its surrounding parts provided in a vehicle according to an embodiment of the present invention. Figure 1 The power supply system 100 illustrated includes an AC inverter 110, a three-pole socket 120, and a leakage current detection device 130.

[0015] AC inverter 110 is a power conversion device that receives DC power from a vehicle-mounted battery (not shown) or the like, converts the input DC power into AC power of a specified frequency (DC / AC conversion), and outputs it.

[0016] The three-pole socket 120 is a power supply port (discharge port) for electrically connecting the electrical equipment 220 to the AC inverter 110 via the power plug 210. The three-pole socket 120 has a first output terminal 121 that serves as the hot ground side of the AC power supply, a second output terminal 122 that serves as the cold ground side of the AC power supply, and a grounding terminal 123 for grounding.

[0017] The first output terminal 121 is connected to the hot ground side of the AC inverter 110 via the first wire 141 through the leakage current detection device 130. The second output terminal 122 is connected to the cold ground side of the AC inverter 110 via the second wire 142 through the second wire 130 through the leakage current detection device 130.

[0018] The grounding terminal 123 is connected via a third wire 143, which is used for a dedicated power supply circuit, to the cold ground wire (second wire 142) that connects the AC inverter 110 to the leakage current detection device 130. This grounding terminal 123 is not connected to the vehicle body 300, therefore the potential of the grounding terminal 123 is different from the potential of the vehicle body 300 or other metal housings such as the frame (they do not share a potential).

[0019] The leakage current detection device 130 is configured to detect leakage current in the AC inverter 110 (first wire 141, second wire 142) and disconnect the electrical connection between the AC inverter 110 and the three-pole socket 120 to stop power supply. This leakage current detection device 130 can use known devices.

[0020] A power plug 210 is disposed on electrical equipment 220 and configured to connect to a three-pole socket 120 to supply power to electrical equipment 220. The power plug 210 includes a three-pole plug with a grounding terminal (or grounding wire) and a two-pole plug without a grounding terminal.

[0021] Electrical equipment 220 is a device (electrical appliance, etc.) that operates using AC power and can receive AC power from the vehicle (AC inverter 110) via power plug 210 to operate.

[0022] [Function / Effect]

[0023] In the power supply system 100 structure described in this embodiment, the grounding terminal 123 of the three-pole socket 120 is connected to the cold ground side of the AC inverter 110 via the third wire 143 but without passing through the leakage current detection device 130, instead of being directly grounded to the vehicle body 300 (vehicle body grounding), thereby fulfilling the function of grounding. That is, the power supply system 100 structure described in this embodiment does not use vehicle body grounding, but achieves (maintains) grounding connection on the power supply circuit side.

[0024] With this grounding connection structure, a closed grounding circuit can be formed via the third wire 143 without passing through the vehicle body 300. Therefore, regardless of whether a three-pole plug with a grounding terminal or a two-pole plug without a grounding terminal is connected to the three-pole socket 120 as the power plug 210, the risk of electric shock due to contact with the vehicle body 300 when leakage occurs in the electrical equipment 220 can be minimized, and the situation where the electrical equipment 220 that requires grounding connection stops operating can be avoided (improving convenience).

[0025] <Reference Example>

[0026] Figure 2 The diagram shows a reference example of a power supply system 500 configured to form a closed circuit. This reference example of a power supply system 500 demonstrates a countermeasure to eliminate malfunctions of electrical equipment 220 that requires a grounding connection by not using a third wire 143, which is a circuit dedicated to power supply functions.

[0027] In the power supply system 500 of this reference example, a special power plug (such as an equipotential bonding plug) 520 that short-circuits the second output terminal (cold ground side) and the ground terminal of the three-pole socket is inserted into the three-pole socket 510. This forms... Figure 2 The grounding closed circuit shown by the dashed line can therefore prevent the electrical equipment 220 that requires a grounding connection from stopping operation.

[0028] This invention can be used in vehicles and other vehicles equipped with power supply systems that have AC sockets for power supply.

[0029] Symbol Explanation

[0030] 100, 500 - Power supply system; 110 - AC inverter; 120, 510 - Three-pole socket; 121 - First output terminal; 122 - Second output terminal; 123 - Grounding terminal; 130 - Leakage detection device; 141 - First wire; 142 - Second wire; 143 - Third wire; 210, 520 - Power plug; 220 - Electrical equipment; 300 - Vehicle body.

Claims

1. A vehicle, characterized in that, have: A power conversion device that converts input DC power into AC power and outputs it. A three-pole socket having a grounding terminal for supplying the AC power output from the power conversion device; and A leakage current detection device is inserted between the power conversion device and the three-pole socket. The grounding terminal of the three-pole socket is connected to the cold ground wire that connects the power conversion device and the leakage detection device.

2. The vehicle according to claim 1, characterized in that, The potential of the grounding terminal is different from the potential of the metal housing that constitutes the vehicle body or frame.

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