POWER-SUPPLY DEVICE AND CONTROL METHOD THEREFOR

摘要

A power supply device includes: a first power supply (1a) capable of storing and discharging electric power; a second power supply (2) connected in series to the first power supply (1a) and capable of storing and discharging the electric power; and an isolated DC-DC converter (3a) including primary side terminals to which the first power supply (1a) is connected, and secondary side terminals to which the second power supply (2) is connected. The power supply device controls a voltage of the second power supply (2) using the isolated DC-DC converter (3a). A direct-current voltage outputted from the first power supply (1a) and the second power supply (2) connected in series is inputted to a first inverter (5), converted into an alternating-current voltage by the first inverter (5), and then supplied to a vehicle drive motor (6).