Abstract

This paper deals with an efficient method of improving power quality for arc welding power supply. The analysis and design of modular three-phase ac-dc converter using three single-phase high frequency transformer based push-pull converter are carried out for welding power supply. A three-phase modular power-factor-correction (PFC) converter connected to a pulse width modulated (PWM) dc-dc converter ensures nearly unity power-factor of arc welding power supply and also suppresses input current harmonics. It includes the operation of a modular converter in discontinuous-conduction-mode (DCM) of operation with inherent power factor correction (DCM-PFC). This PFC converter exhibits ease of control, high frequency isolation as well as single stage power conversion. The fast dynamic response of this converter has a constant voltage mode in the range of welding currents and inherent parametrical short-circuit limit. This leads to improved arc stability and weld bead quality.

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