Patent ID: 7456619

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 configured to discharge electrical charges from the capacitor while the regulator is in an OFF state; and a starting controller configured to transmit a signal for controlling ON/OFF switching of the regulator; wherein the discharging circuit further comprises: a first switch connected in series between the standard voltage generator and the regulator; and a second switch having one end connected to a connection node between the first switch and the regulator, and having another end connected to a ground, wherein 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.