Patent ID: 8269473

Claim:
An AC high voltage power supply device, comprising: a comparison circuit configured to compare a first sinusoidal waveform signal and a second triangular waveform signal, and to output a comparison result signal corresponding to results of the comparison; a switching amplifier circuit configured to perform a full switching operation based on the comparison result signal output from the comparison circuit to perform signal amplification, and to output a full switch signal in which a low level is 0V; a conversion circuit configured to convert a waveform of the switch signal output from the switching amplifier circuit into a sinusoidal waveform, and to output a converted signal; a transformer configured to boost a voltage of the converted signal output from the conversion circuit; and a control circuit configured to perform feedback control on the first sinusoidal waveform signal based on a monitoring signal at an input or an output of the transformer, so that a peak level of the output signal of the transformer becomes a desired peak level, the control circuit comprising: a feedback circuit configured to receive the monitoring signal and to output a feedback signal, a level adjusting circuit configured to adjust a peak level of the first sinusoidal waveform signal according to the feedback signal output from the feedback circuit, a current detecting resistor for detecting a current value of the monitoring signal and converting it to voltage information, and a half-wave rectifying circuit for half-wave rectifying signals output from the current detecting resistor and outputting a peak value, wherein the level adjusting circuit includes: a reference voltage signal generating circuit for generating a reference voltage signal corresponding to a desired level, and an operational amplifier for detecting a difference between a signal output from the reference voltage signal generating circuit and the peak value signal output from the half-wave rectifying circuit.