| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply device which is charged with power generated by an on-vehicle generator and has excellent charging efficiency in charging a battery which supplies power to an electric load group.SOLUTION: A lithium storage battery 1 is connected to an electric load 41 and an ISG (Integrated Starter Generator) 3. A lead storage battery 2 is connected to a starter 5. When the ISG 3 generates power and output voltage of the lead storage battery 2 detected by a voltage detector 72 is not less than predetermined voltage, a control section 7 performs control to disconnect the lithium storage battery 1 from the lead storage battery 2 with a switch 6. When the ISG 3 does not generate power and the output voltage of the lithium storage battery 1 is not more than the output voltage of the lead storage battery 2, the control section 7 performs the control to connect the lithium storage battery 1 to the lead storage battery 2 with the switch 6. |
