| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive and hardly breaking down dual power supply unit for automobile without using a DC-DC converter.SOLUTION: A dual power supply unit for automobile 100 comprises: a power source 101 that supplies a first voltage V; step-down circuit 102 that supplies the first voltage Vafter stepping down to a second voltage V; and a switch 103 connected between the power source 101 and the step-down circuit 102. The step-down circuit 102 comprises: a plurality of charging/discharging units 108, 109; and a plurality of rectifier elements 110, 111, 112 which are arranged such that the plurality of charging/discharging units 108, 109 are connected in series when charging the plurality of charging/discharging units 108, 109, and the plurality of charging/discharging units 108, 109 are connected in parallel when discharging the plurality of charging/discharging units 108, 109. |
