POWER SUPPLY DEVICE IN ELECTRIC MOTOR VEHICLE

摘要

PROBLEM TO BE SOLVED: To provide a power supply device in an electric motor vehicle capable of miniaturizing a precharge contactor and a main contactor that connect a battery and a load, and reducing an influence on the precharge contactor and the main contactor resulting from reduction in a voltage of a sub-battery or the like.SOLUTION: A power supply device 100 in an electric two-wheeled vehicle 10 includes: a main battery 18; a main contactor 106 and a precharge contactor 108 that perform connection and disconnection between the main battery 18 and an inverter circuit 112 and the like by being turned on and off; a sub-battery 68 as a drive power source of the contactors 106 and 108; a BMU 104 that drives and controls the contactors 106 and 108; and a voltage sensor 117 that senses a voltage value of the sub-battery 68. When the voltage value sensed by the voltage sensor 117 is larger than a threshold, the BMU 104turns on the precharge contactor 108 prior to the main contactor 106.