International Research Publication House
In this paper, a novel auto connected 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 behavior 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.