| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC power supply device which maximally utilizes a lithium ion capacitor unit, and maintains power feed to a load, in the DC power supply device which uses the lithium ion capacitor unit as a power accumulation means.SOLUTION: The power accumulation means includes the lithium ion capacitor unit 1 and a lead accumulator 3 which are connected to the load in parallel, and a voltage detection means 5 which detects a voltage of the lithium ion capacitor unit 1. When the voltage detection means 5 detects that the voltage of the lithium ion capacitor unit 1 reaches a unit lower-limit voltage or lower, a control circuit 7 outputs a conduction signal which brings a switching circuit SW1 into a conductive state. When the switching circuit SW1 goes into a conductive state, power is supplied to a motor M from a secondary battery 3. At this time, the lithium ion capacitor unit 1 is charged from the secondary battery 3. |
