Patent ID: 8896222

Claim:
A power supply device comprising: a rectifying circuit configured to rectify an alternating-current power supply; and a power-supply-voltage converting section including a plurality of power-supply-voltage converting circuits provided between the rectifying circuit and a plurality of output sections to which loads are respectively connected, the plurality of power-supply-voltage converting circuits including switching elements configured to convert a power supply voltage rectified by the rectifying circuit and supply the power supply voltage to the loads, and the switching elements of the plurality of power-supply-voltage converting circuits being set to at least two different switching frequencies for turning on and off the switching elements and being turned on and off with the respective switching frequencies fixed, wherein a first switching element of a first power-supply voltage converting circuit is set to a first switching frequency for turning on and off the first switching element and a second switching element of a second power-supply converting circuit is set to a second switching frequency for turning on and off the second switching element, the first switching frequency being different from the second switching frequency.