Patent ID: 7821798

Claim:
A high voltage power supply, comprising: a controller to provide a PWM (pulse width modulation) signal and a power signal; an input unit to receive the PWM signal provided from the controller; a comparison unit to receive the power signal provided by the controller and to compare the received PWM signal filtered to a DC voltage level by the input unit to a reference voltage signal and to provide an output power signal; a transformation unit to transform the output power signal, output from the comparison unit, into a high voltage output signal; and a rectification unit to rectify the high voltage output signal output from the transformation unit into a high voltage DC signal, wherein the high voltage power supply further includes a power input delay unit to receive the power signal from the controller and to delay the output of the power signal to the comparison unit by a predetermined time from when the power signal is initially provided by the controller for input into the comparison unit.