Patent ID: 8886073

Claim:
An image forming apparatus comprising: first and second switching units configured to be disposed in respective ones of two supply paths that are different in polarity and over which alternating-current power from a commercial alternating-current power supply is supplied, and switch supply and shut off of the alternating-current power; noise filter circuits configured to be disposed downstream of said first and second switching units and filter out noise on the two supply paths; a power supplied device configured to be disposed downstream of said noise filter circuit and be supplied with the alternating-current power through said noise filter circuit; and a control unit configured to, when supply of the alternating-current power from the commercial alternating-current power supply to said power supplied device is started, control said first and second switching units to switch one of said first and second switching units into supply state and then switch the other one of said first and second switching units into supply state so that the number of times said first switching unit is switched into supply state first and the number of times said second switching unit is switched into supply state first can be substantially equal per predetermined number of times the alternating-current power is supplied to said power supplied device.