FIXING DEVICE, IMAGE FORMING DEVICE, AND FIXING DEVICE POWER CONTROL METHOD

摘要

A fixing device (3) comprises: a heating roller (15) and a pressure roller (16); a heating sheet (25); a power source unit (45); a roller temperature sensor (46); and a control unit (47) for controlling the power that is supplied from the power source unit (45) to the heating sheet (25). The control unit (47) selects the power supplied to the heating sheet (25) from among a standard voltage, a first modulated voltage (VH) lower than the standard voltage, and a second modulated voltage (VL) lower than the first modulated voltage (VH). The control unit (47) alternately applies the first modulated voltage (VH) and the second modulated voltage (VL) to the heating sheet (25) when the fixing device (3) is idling, and maintains the temperature of the surface of the heating roller (15) at a target temperature (To).