Patent ID: 7936545

Claim:
A power supply control system, comprising: a power supply unit that includes a detachable battery; a power supply circuit that supplies DC voltage to a load; a first switch circuit that is connected in series between the power supply unit and the power supply circuit; a first control unit that operates in one of a first mode and a second mode in which a consumption current is smaller than in the first mode, wherein the first control unit can determine whether or not a current flowing into the first switch circuit is abnormal if the first control unit is operated in the first mode, and the first control unit turns off the first switch circuit if the first control unit determines that the current flowing into the first switch circuit is abnormal; an opening-closing state detection unit that detects whether a battery lid is one of an opening state and a closing state, wherein the battery lid is provided to the power supply unit; and a second control unit that controls the first control unit to cause the first control unit to operate in one of the first mode and the second mode, wherein if the opening-closing state detection unit detects that the battery lid is in the opening state, the second control unit causes the first control unit to operate in the first mode before the second control unit causes the first control unit to operate in the second mode so that the first control unit can determine whether or not the current flowing into the first switch circuit is abnormal.