INDUCTION HEATING FUSER UNIT AND IMAGE FORMING APPARATUS

摘要

PURPOSE: An induction heat fixing apparatus and an image forming apparatus are provided to execute PWM control by following a resonant frequency without considering variation of temperature. CONSTITUTION: A phase comparing unit(125) compares phase of current flowing an induction coil and a pulse. A resonant frequency following oscillating unit(126) changes a resonant frequency circuit through a detection result of phase difference of the phase comparing unit. A PWM(Pulse Width Modulation) signal generating unit(127) generates the pulse for driving the series resonant frequency.