Fuzzy Bridgeless Power Factor Correction Based Converter Welding Applications

Abstract

This concept deals with a new single-phase bridgeless AC-DC converter for AWPS (Arc Welding Power Supply) with an ability to improve the power factor at AC mains. The PFC (Power Factor Correction) converter is based on high frequency isolated Cuk converter topology. The conduction losses are reduced by eliminating the DBR (Diode Bridge Rectifier) in classical converter topology. The proposed converter topology is designed to operate in DCM (Discontinuous Conduction Mode) for simple control and to minimize the EMI (Electromagnetic Interference). The DCM operation also facilitates to achieve a unity power factor at AC mains. This converter regulates constant voltage at the output in the range of welding currents and inherent parametrical short-circuit current limit to improve the weld bead quality. The dynamic and steady state responses of the proposed AC-DC converter are included to validate the capability of converter for welding power supply. The proposed concept can be implemented to fuzzy logic controlled applications by using mat lab/Simulink software.