Patent ID: 7242196

Claim:
A power supply controller apparatus for use in a power supply apparatus comprising a battery assembly consisting of at least one secondary battery connected in series, wherein said power supply apparatus further comprises a first contactor having one end connected to one end of said battery assembly, and a second contactor having one end connected to the other end of said battery assembly, wherein said power supply controller apparatus comprises a controller for controlling supplying power to a load from said battery assembly through a capacitor connected between the other end of said first contactor and the other end of said second contactor, by turning on and off each of said contactors, wherein said controller detects whether or not said each contactor is welded based on an output signal from one output terminal of one and the other ends of said capacitor, when said each contactor is controlled to be turned off and an AC signal is applied to one input terminal of (a) one end of said battery assembly, (b) the other end of said battery assembly, and (c) each connection point between secondary batteries of said battery assembly.