Patent ID: 7808224

Claim:
A high-frequency power supply circuit characterized in comprising: a basic drive square wave generation circuit unit for generating a basic drive square wave having an output frequency outputted from the high-frequency power supply circuit; a differentiation signal generation circuit unit for generating a front edge or rear edge differential signal of the generated basic drive square wave; a vibrator circuit unit having square wave signal generator for outputting a square wave signal having a signal width within a time period corresponding to a half cycle of the output frequency upon input of a trigger signal from an external source, and signal width control circuits for variably controlling the signal width of said square wave signal on the basis of a control signal for controlling power output frequency; and a switching amplification circuit unit for amplifying an amplification source signal based on an output signal from the vibrator circuit unit; the differential signal being generated by the differential signal generation circuit unit is used as a trigger signal in said vibrator circuit unit.