| 摘要 |
PROBLEM TO BE SOLVED: To provide an on-vehicle charge system capable of reliably performing charging.SOLUTION: An on-vehicle charge system 1 for charging a high voltage battery 3 for supplying power to a vehicle drive motor and a low voltage battery 4 for supplying power to a vehicle electric component comprises: a first step-down circuit 30 for generating high voltage battery charge voltage V3 for charging the high voltage battery 3 by stepping down DC voltage converted from voltage of external input; a fryback power supply 9 and a second step-down circuit 60 which are connected to the first step-down circuit 30 in parallel with the high voltage battery 3, where the fryback power supply 9 generates power supply voltage Vb to a first step-down circuit control unit 44 for controlling the first step-down circuit 30 and the second step-down circuit 60 generates low voltage battery charging voltage V2 for charging the low voltage battery 4; and a first step-down circuit auxiliary power supply 50 for supplying the power supply voltage Vb to the first step-down circuit control unit 44. |
