Patent ID: 7964985
Filing Date: 2011-06-21
Classification: B60L,G01R,H01H,Y02T

Abstract:
1. A power supply control device, comprising: a direct current power supply; a first relay connected between one electrode of said direct current power supply and a first power line; a second relay connected between the other electrode of said direct current power supply and a second power line; a capacitive element connected between said first and second power lines; a bidirectional converter connected between said first and second power lines in parallel with said capacitive element; an auxiliary equipment power storage device connected to said bidirectional converter; a voltage detection device detecting a voltage across said capacitive element; and a control device controlling said bidirectional converter to charge said capacitive element using said bidirectional converter, said control device dividing charging of said capacitive element into two stages, controlling said bidirectional converter to charge said capacitive element to a prescribed voltage lower than a voltage of said direct current power supply in a first stage, thereafter turning said first and second relays to an off state and an on state, respectively, determining whether or not said first relay is welded based on a change in a detected voltage value from said voltage detection device at that time.