Ĉuk topology based new three phase to single phase cycloconverter with input current shaping and input power factor improvement

Abstract

In this paper, a new three to single phase cycloconverter based on Ĉuk topology is proposed. The circuit will provide the load with adjustable AC voltage and frequency having low input current distortion, high input power factor and maintain high power conversion efficiency. In case of conventional cycloconverters, input power factor is low and input current is distorted. Complex control circuitry and large input filter are needed to alleviate these problems to improve power quality of the input side of the cycloconverter. In the proposed topology, reduced number of switches reduces the complexity of the control circuit, minimizes the switching losses and thereby increases the efficiency. High input power factor, low values of input filter, high efficiency and low input current THD for a wide range of duty cycles makes the proposed topology a significant advantage over conventional 12 SCR three phase to single phase cycloconverter. Incorporation of SMPS conversion makes both step up and step down voltage conversion in the proposed cycloconverter. The circuit is designed and simulated for resistive, RL and motor load with back emf showing desired satisfactory results.