Low cost, high speed, high voltage flyback regulator circuit

摘要

A conventional flyback type deflection system develops a high DC voltage that is sensed by a small potentiometer connected in series with a bleeder resistor coupled across the flyback winding. A differential amplifier compares the sensed voltage with a reference voltage and drives a voltage controlled oscillator, which develops a pulse output whose frequency is a function of the sensed voltage. The VCO drives a FET that in turn controls current flow through a small flyback coil arrangement. The output of the coil arrangement is rectified and a DC compensating voltage is developed across a capacitor that is coupled in series with the high voltage flyback winding.