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ABSTRACT:In this paper a novel autoconnected transformer based 28-pulse ac-dc converter fed SMPS is designed to improve the power quality at the point of common coupling. It consists of two series connected 14-pulse ac-dc uncontrolled converters fed by seven phase shifted ac voltages. The behaviour of the converter is studied in MATLAB based simulation under various load conditions. It has been found that the % input ac mains current THD is less than 5% in the complete range of varying loads, with a power factor close to unity which meets the requirements of IEEE-519 standard. Thus, our proposed topology resulted in much reduction in % input mains current THD with enhanced power factor compared to conventional multi pulse ac-dc converter.