A flexible and cost-effective family for AC/DC converters with input-current-shaper and fast output-voltage-regulation

Abstract

This paper presents a flexible and cost-effective design for AC/DC Converter with input current shaper and fast output voltage regulation in wide range input application. These single-stage AC/DC converters are based on a boost type input-current-shaper (ICS). An additional winding in main transformer replaces most part of a bulk inductor in a boost type ICS, so the weight and size of magnetic material are significantly reduced. The total harmonic distortion (THD) of a line current complies with IEC61000-3-2. A magnetic feedback method is employed in the new topologies. Therefore, the voltage across bulk capacitor can be hold under 450v by tuning transformer windings ratio even though the converter operates in wide range input voltage (90vsimilar to265v/ac). A fast output voltage regulation is achieved by employing simple voltage mode control or conventional peak-current mode control.