Study of Sepic AC-DC-AC matrix converter based on AC chopper principle

A new AC-DC-AC matrix converter topology based on Sepic is proposed. The basic configuration of the new topology and its fundamental principle are firstly introduced, the analytic expression on the function of voltage transfer ratio and duty cycle is analyzed, and the rationale of double-loop control strategy is clarified. Finally the validity and feasibility of the new topology are tested by means of computer simulation and prototype experiment. The results indicate that the regulation of the voltage transfer ratio and output frequency can be realized by the new converter, furthermore the system can be started well and the harmonic distortion of waveform is lower. So the inherent drawback of low voltage transfer ratio of traditional matrix converter is effectively settled. This study may provide inspiration for further engineering application.