Patent ID: 9559620
Date: 2017-01-31
CPC Classifications: B60L,H02M,H02P,Y02T

Claim:
1. A power supply device comprising: a first power supply capable of storing and discharging electric power; a second power supply connected in series to the first power supply and capable of storing and discharging the electric power; an isolated DC-DC converter including a primary side terminal to which the first power supply is connected, and a secondary side terminal to which the second power supply is connected; and a power supply control unit that controls a voltage of the second power supply using the isolated DC-DC converter, wherein a sum of a direct voltage outputted from the first power supply and the second power supply connected in series is inputted to a first inverter, converted into an alternating-current voltage by the first inverter, and then supplied to a vehicle drive motor, and wherein, when a vehicle performs power running by use of the vehicle drive motor, the power supply control unit controls the isolated DC-DC converter in order to establish off-state if the sum of the direct voltage is greater than a lower limit acceptable by the first inverter.