US Patent 7460808 Image forming apparatus and power supply control method

An image forming apparatus includes a cover, a switch that opens or closes in conjunction with the cover, a load unit, a load power supply device that supplies power to the load unit, a relay that passes power from the load power supply device to the load unit in conjunction with the switch, and a controller that detects opening or closing of the switch and controls the load power supply device according to a detection result. When opening of the switch is detected, the load power supply device is controlled to interrupt supplying power to the load unit until closing of the switch is detected.