| 摘要 |
PROBLEM TO BE SOLVED: To use a secondary battery for driving and a secondary battery for electrical equipment under a close to ideal condition by making effective use of preferred characteristics of the secondary battery for driving and the secondary battery for electrical equipment. SOLUTION: This power supply unit for hybrid car includes a secondary battery for driving 1 which drives a motor 8 for running, a secondary battery for electrical equipment 2, a step-down circuit 3 for converting an output voltage of the secondary battery for driving 1 to a voltage for charging the secondary battery for electrical equipment 2, a step-up circuit 4 for converting an output voltage of the secondary battery for electrical equipment 2 to a voltage for charging the secondary battery for driving 1, and a battery control circuit 5 for charging the secondary battery for electrical equipment 2 with the secondary battery for driving 1 through the step-down circuit 3 and charging the secondary battery for driving 1 with the secondary battery for electrical equipment 2 via the step-up circuit 4. In this power supply unit, the battery control circuits 5 controls the step-down circuit 3 and the step-up circuit 4, and mutual charging/discharging is performed between the secondary battery for driving 1 and the secondary battery for electrical equipment 2. |
