| 摘要 |
PROBLEM TO BE SOLVED: To provide a resonance control circuit capable of reducing a possibility of the occurrence of failure due to fluctuation of power source voltage without using a current transformer, a fixing device, and an image forming apparatus.SOLUTION: A resonance control circuit includes: a series circuit that includes switching elements Q1 and Q2 connected between power receiving terminals 401 and 402; a resonance circuit 41 that is connected with a contact point P1 of the switching element Q1 and Q2; diodes D1 and D2 that are connected in parallel with the switching elements Q1 and Q2; a resonance control unit 421 that alternately turns on and off the switching elements Q1 and Q2 in a switching period Ts1 in order not to simultaneously turn on the switching elements Q1 and Q2, so as to generate resonance in the resonance circuit 41; and a comparator 43 that detects a voltage between both ends of the switching element Q1, and when the detected voltage exceeds a determination voltage V1, maintains the switching element Q1 in an off state regardless of the control by the resonance control unit 421. |
