Patent ID: 7756438

Claim:
A heating device for fusing a toner image, the device comprising: a power supply unit for supplying a first alternating current for generating at least a second alternating current; an insulation unit for generating a first induced current in response to at least the second alternating current, the insulation unit comprising a primary and a secondary coil, wherein the primary coil is electrically insulated from a heating body of the heating device and is switchably controlled by an alternating current generator electrically coupled to the primary coil, and wherein the secondary coil is electrically coupled to the heating body of the heating device to provide the first induced current to the heating body; and the heating body, configured to be resistance-heated by a second induced current generated in the heating body by the first induced current received from the secondary coil of the insulation unit, and wherein the insulation unit is physically outside the heating body.