Patent ID: 8559842

Claim:
A power supply apparatus that supplies a plurality of electric powers with different voltages, the power supply apparatus comprising: a first electric power-generating circuit that generates an electric power with a first voltage; a second electric power-generating circuit that generates an electric power with a second voltage that is higher than the first voltage; and an overcurrent monitoring circuit to which electric powers for operation are supplied from the first electric power-generating circuit and the second electric power-generating circuit and that monitors overcurrent in the second electric power-generating circuit, wherein the overcurrent monitoring circuit comprises: a current detecting unit that detects a current flowing from the second electric power-generating circuit into a load when the electric power with the second voltage is supplied to the load; and a comparing unit that outputs a stop signal for stopping generation of the electric power with the second voltage to the second electric power-generating circuit, when a level of a signal corresponding to the current which has been detected exceeds a predetermined value.