Patent ID: 8315534

Claim:
An image forming device, comprising: a main power supply that supplies AC power and DC power to a load of the image forming device; an auxiliary power supply that stores DC power and supplies the stored DC power to the load; and a control unit adapted to control the main power supply and the auxiliary power supply so that the stored DC power of the auxiliary power supply is supplied to the load during a predetermined period after any of a return from a low-power mode to a normal-power mode, a return from a pause mode to the normal-power mode, and a power-up of the image forming device occurs, wherein the auxiliary power supply does not supply the stored DC power to the load, and the main power supply supplies the AC power and the DC power to the load if it is determined that a predetermined processing is performed upon a starting of the image forming device, the auxiliary power supply supplies the stored DC power to the load, it is determined whether a predetermined time has elapsed, and the main power supply does not supply the AC power and the DC power to the load if it is determined that the predetermined processing is not performed upon the starting of the image forming device, and a decision whether the predetermined processing is performed is made based on at least one of a number of sheets, an elapsed time, and an environmental temperature.