An Extendable Single‐Phase Boost AC–AC Converter With Continuous Input Current and Step‐Changed Frequency Operation

ABSTRACT In this paper, an extendable single‐phase boost AC–AC converter with continuous input current and step‐changed frequency operation is proposed. The inherent commutation advantage eliminates the necessity for snubber circuits and the implementation of complex commutation strategies, thereby addressing commutation issues effectively. Output voltage regulation is achieved through the use of just two high‐frequency switches, while four low‐frequency switches on the output side facilitate variable‐frequency operation. This proposed converter employs switched‐capacitor (SC) cells to enhance its configuration, resulting in a notable increase in voltage gain. It features continuous input current and negates the need for a bulky LC filter. Moreover, the converter adopts a straightforward and adaptable switching strategy to produce variable output frequencies. By minimizing the total power ratings of the switches, known as the switching device power (SDP) parameter, it leads to reduced voltage and current ratings for the semiconductors, ultimately lowering the overall cost of the converter. A comprehensive analysis of the proposed converter is provided, along with experimental validation using a laboratory prototype at three output frequencies: 25, 50, and 100 Hz.