| 摘要 |
PROBLEM TO BE SOLVED: To provide a power source device for a vehicle capable of reducing component cost, as the miniaturization of a bypass circuit or the reduction in the number of circuit components for a DC/DC converter becomes possible.SOLUTION: A power source device for a vehicle comprises: DC/DC converters 7 and 8 which convert voltage passing through power supply side fuses F1 and F2 from on-vehicle power sources 4 and 6; bypass circuits S1 and S2 which are turned off while the DC/DC converters 7 and 8 are operating; and branch circuits (Ry1, Ry2, and F3-F7) which branch the voltage converted by the DC/DC converters 7 and 8 and supply it to a plurality of loads L1-L6 via load side fuses F3-F7 respectively. The DC/DC converters 7 and 8, the bypass circuits S1 and S2, the load side fuses F3-F7 and the branch circuits (Ry1, Ry2, and F3-F7) are accommodated in the same housing 1a, and it is configured in such a manner that current capacity of the bypass circuits S1 and S2 is made to be smaller than current capacity of the power source side fuses F1 and F2. |
