Patent ID: 7642761

Claim:
A power supply circuit comprising: a standard voltage generator configured to generate a standard voltage; a regulator configured to control an output voltage by use of a reference voltage based on the standard voltage outputted from the standard voltage generator, and to be capable of being switched ON/OFF; a capacitor connected in parallel to the regulator between the standard voltage generator and the regulator; a discharging circuit including a first switch and a second switch, and configured to discharge electrical charges from the capacitor via the second switch while the regulator is in an OFF state; and a starting controller configured to transmit a signal for controlling the first switch and the second switch, wherein the first switch is connected in series between the standard voltage generator and the regulator, the second switch has one end connected to a connection node between the first switch and the regulator, and has another end connected to a ground, the first switch is turned to an OFF state, and the second switch is turned to an ON state while the regulator is in an OFF state.