| 摘要 |
PROBLEM TO BE SOLVED: To improve controllability, that will not apply excessive load on the switching element of a high-frequency power source and to save energy, by avoiding deterioration in heating efficiency in an electromagnetic induction heating fixing unit using magnetic shunt alloy in a body to be heated. SOLUTION: An IH control part 50 for controlling the switching element 44 so that power supplied to an excitation coil 32 has power-varying control carried out adjusting supplied power according to detected temperature of a thermistor 49, in order to maintain a heat roller 21 at a fixing temperature after termination of warming up, when power required for maintaining the fixing temperature reaches a minimum power value; a fixed power intermittent control is carried out intermittently carrying out power supply in which casted power is fixed according to the detected temperature of the thermistor; a minimum power value which is to become a reference, when power varying control is switched to fixed power intermittent control is determined, based on the input voltage and the detected temperature of the thermistor. COPYRIGHT: (C)2008,JPO&INPIT
|
