Abstract

This paper presents a transformerless single-stage single switch AC/DC converter with direct power transfer and high power factor suitable for universal line applications ( 90-270Vrms).Unlike existing single-stage ac/dc converters with uncontrolled intermediate bus voltage, a new high step-down transformerless single-stage single switch ac/dc converter achieving intermediate bus voltage regulation and output voltage regulation is proposed. With the direct power transfer feature, the converter is able to achieve efficient power conversion, high power factor correction, low voltage stress on intermediate bus (less than 120V) and low output voltage. The topology integrates a buck-type power-factor correction (PFC) cell with a buck�boost dc/dc cell and part of the input power is coupled to the output directly after the first power processing. A detailed analysis of the proposed converter for regulated intermediate bus voltage and output voltage with simulation results are presented. From experimental set up we obtain 12V output by giving 230V as input.

Paper Details