Patent ID: 7471012

Claim:
A power supply apparatus for a vehicle, comprising: a first power source; a load driven by said first power source; a connecting portion performing connection and disconnection of a current supply path between said first power source and said load; a control unit controlling the connection and disconnection by said connecting portion; a first line transmitting a control signal from said control unit to said connecting portion; and a second line coupled to a first constant potential corresponding to an inactive potential of said control signal and extending in parallel with said first line, wherein said first power source and said connecting portion are arranged in a rear area with respect to a passenger seat in a vehicle, said load and said control unit are arranged in a front area with respect to said passenger seat in the vehicle, and said first and second lines extend in parallel between said rear area and said front area; a second power source arranged in said rear area and supplying said control unit with a second constant potential corresponding to an active potential of said control signal; and a third line connecting said second power source and said control unit and providing said second constant potential to said control unit, wherein in a path along which said lines extend in parallel between said rear area and said front area, a distance between said first line and said second line is smaller than a distance between said first line and said third line so that even if a part of the vehicle is deformed by collision, the probability of the connecting portion becoming conductive again is lowered.