To reduce control noise and to eliminate large vibration of an error signal so as to improve control stability by making on-width control of a switching element and the phase conductive angle of input alternating voltage related to each other, and controlling according to temperature error signal.
Commercial alternating input voltage is applied between terminals 1, 2, and a switch rectifying element 10 becomes conductive, so that a filter capacitor 5 is charged via a double-wave rectifying bridge 3 and a filter inductance 4, A switching element 8 is switched on/off so as to supply electric power to resonating load (a resonance capacitor 6 and a magnetic induction exciting coil 113) with the charged voltage value as a voltage source. In this case, the switching-on width of the switching rectifying element 10 is controlled to be narrowed into a range so as not to deviate from a resonance state, and output is restricted through temperature control, while the resonance state is maintained. Time width control (phase control) with a zero-cross point of the input alternating voltage as an origin is then performed.
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