Low-voltage power supply for electric vehicle
Low-voltage power supply for electric vehicle
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发表时间：
2012-05
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通讯作者：
刘飞;文锋;盛大双;阮旭松
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文献类型：
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作者：
刘飞;文锋;盛大双;阮旭松
本实用新型涉及一种电动车用低压电源。车载低压蓄电池、车载充电器、单刀双掷继电器，在车载充电器的输出正极与电池管理系统（BMS）的电源地之间串接继电器线圈，继电器线圈开关的公共端通过熔断器与BMS ON-gear信号线连接，继电器线圈开关的公共端通过熔断器与BMS ON-gear信号线连接，继电器线圈开关的公共端通过熔断器与电池管理系统（BMS）的电源地连接，继电器线圈开关的公共端通过熔断器与BMS ON-gear信号线连接，继电器线圈开关的公共端通过熔断器与BMS ON-gear信号线连接。继电器线圈开关的常闭触点通过车钥匙开关与车载低压蓄电池的正极连接，继电器线圈开关的常开触点与车载充电器的输出正极连接;车载低压蓄电池的负极，车载充电器的输出负极和BMS的电源地分别与低压直流充电器的直流充电插头的负极连接，车载低压蓄电池正极通过熔断器与BMS的公共火线连接。本发明通过单刀双掷继电器判断整车的工作模式，解决了作为整车直流变换器的车载充电器和地面充电器兼容性差的问题，能够充分利用市电，延长低压蓄电池的使用寿命。
The utility model relates to a low-voltage power supply for an electric vehicle. The power supply comprises a vehicle-mounted low-voltage storage battery, a vehicle-mounted charger and a single-pole double-throw relay, wherein a relay coil is serially connected between the output anode of the vehicle-mounted charger and a power ground of a battery management system (BMS); the common terminal of a relay coil switch is connected with a BMS ON-gear signal wire through a fuser; the normally closed contact of the relay coil switch is connected with the anode of the vehicle-mounted low-voltage storage battery through a vehicle key switch; the normally open contact of the relay coil switch is connected with the output anode of the vehicle-mounted charger; the cathode of the vehicle-mounted low-voltage storage battery, the output cathode of the vehicle charger and the power ground of the BMS are respectively connected with the cathode of a direct-current charging plug of a low-voltage power supply of the electric vehicle; and the anode of the vehicle-mounted low-voltage storage battery is connected with the common live wire of the BMS through a fuser. By the low-voltage power supply, the working mode of the complete vehicle can be judged through the single-pole double-throw relay, so that the problem of poor compatibility of a vehicle-mounted charger and a ground charger which serve as direct-current converters of the complete vehicle can be solved, mains power can be fully utilized, and the service life of the low-voltage storage battery is prolonged.