Patent ID: 7706122

Claim:
An analog control application specific integrated circuit (ASIC) apparatus for a high voltage power supply (HVPS) in an image forming apparatus, wherein the HVPS in the image forming apparatus comprises a transformer transforming an AC signal having a predetermined frequency to a high voltage signal and a voltage doubler outputting a DC high voltage for the HVPS in the image forming apparatus by rectifying and voltage doubling a secondary high voltage signal of the transformer, the analog control ASIC apparatus comprising: an analog control circuit configured as a one-chip ASIC for converting a DC level signal to a high frequency switching signal using a switching component and outputting the converted high frequency switching signal to a primary winding of the transformer, wherein the analog control circuit further comprises: a voltage controller for amplifying the DC level signal; a pulse width modulation (PWM) modulator for modulating a signal output from the voltage controller using a carrier signal; and a gate driver for driving a signal modulated by the PWM modulator as a signal input to the gate of the switching component, wherein the switching component receiving the driving signal of the gate driver through the gate, high frequency switches the received driving signal, and outputs the high frequency switched signal to the transformer.