Low MOSFET Count Isolated DC-AC Converter

This letter proposes a novel soft-switched single-stage-isolated dc-ac converter topology from the industry point of view. The proposed converter requires a lesser number of MOSFETs compared to a widely studied cycloconverter-type (CCT)-isolated dc-ac converter topology. This converter provides lower duty cycle loss, better efficiency, and electromagnetic interference performance compared to a CCT dc-ac converter. Also, it is thermally more stable, thus requires a smaller heat sink. The converter operation is demonstrated in a 1-kW prototype developed with SiC MOSFETs.

Automated summary

A novel soft-switched single-stage-isolated dc-ac converter topology is proposed in this letter, requiring fewer MOSFETs compared to a widely studied cycloconverter-type isolated dc-ac converter. This converter offers lower duty cycle loss, better efficiency, and electromagnetic interference performance than a CCT dc-ac converter, as well as improved thermal stability, requiring a smaller heat sink. The operation of the converter is demonstrated in a 1-kW prototype developed with SiC MOSFETs.