High power factor switching regulator with no rush current

The authors propose two types of switching voltage regulators with improved input power factor using new diode rectifier topology, based on the dither effect. These regulators can achieve over 99% input power factor using simple circuitry and a simple control method. These regulators are distinguished by the absence of rush current during the start up, which can be achieved by control of the switching devices. The basic operation of the dither rectifiers and a comparison between the two switching regulator circuits are presented. Experimental results confirmed over 99.2% power factor and 78% efficiency