Patent ID: 7573150
Filing Date: 2009-08-11
Classification: B60L,H01H,Y02T

Abstract:
1. A power supply control device, comprising: a first relay and a resistance connected in series between an anode of a DC power supply and a load; a second relay connected between the anode of said DC power supply and said load in parallel with said first relay and the resistance connected in series; a third relay connected between a cathode of said DC power supply and said load; a current sensor detecting a DC current flowing through said resistance; a capacity element having one terminal connected to a cathode side of said DC power supply via said third relay and the other terminal connected to an anode side of said DC power supply via said first relay and the resistance connected in series and said second relay to supply power supplied from said DC power supply to said load; a voltage sensor detecting a voltage between both ends of said capacity element; and a determination portion determining welding of said first to third relays; wherein said determination portion includes a first determination portion determining welding of said first relay based on a DC current detected with said current sensor, a second determination portion determining welding of each of said second and third relays based on a voltage detected with said voltage sensor in each of situations wherein only said third relay is brought into conduction and only said first relay is brought into conduction according to a prescribed pattern after performance of said first determination portion, and a determination stop portion stopping performance of said second determination portion when said first determination portion determines that said first relay is welded.