| 摘要 |
A power supply device includes a battery 1, and an output switch 2, and a precharging circuit 3. The battery 1 includes serially-connected cells 10. The output switch 2 is connected to the output side of the battery 1. The circuit 3 precharges a capacitor 21 connected to the vehicle side. After the capacitor 21 is precharged by the circuit 3, the output switch 2 is turned ON so that electric power can be supplied to the vehicle side. The circuit 3 includes precharging switches 4, and a controller 5. The precharging switches 4 can connect nodes 11 corresponding to the cells 10 to the capacitor 21 so that the capacitor 21 is precharged. The controller 5 controls ON/OFF of the precharging switches 4. The controller 5 turns the precharging switches 4 ON one by one from the lower voltage side to the higher voltage side, in precharging operation. |
