Patent ID: 6031748
Filing Date: 2000-02-29
Classification: G06F,H02M,Y02B,Y02P

Abstract:
A power saving circuit of a power factor adjusting type comprising:a rectifying and smoothing part for rectifying, and smoothing an AC power into a DC voltage;a transformer connected to an output terminal on the rectifying and smoothing part for boosting the DC voltage to a level in proportion to a winding ratio thereof;a plurality of field effect transistors each connected to the rectifying and smoothing part and a ground terminal of the transformer for switching the DC voltage; and,a voltage cutting off part connected to a gate terminal of the field effect transistor and a rectified voltage output terminal on the transformer for cutting off voltage generations in a primary winding and a secondary winding by means of photocoupler on reception of a control signal in a DPM mode.