Hybrid Mode Control for ZCS LC Resonant Microinverter with Full Wave Voltage Doubler

This paper proposes a hybrid mode control strategy for an LC resonant microinverter with a full wave voltage doubler in the DC/DC stage. The DC/DC stage generates a DC sinusoidal full-wave current that is synchronized with the grid, while the DC/AC stage utilizes a line-frequency unfolder to convert this current into an AC output. Theoretical analysis shows that there exist two resonant modes according to the characteristics of the LC resonant tank. Zero-current switching (ZCS) for all high-frequency switches and rectifier diodes is achieved, thereby minimizing switching losses and enhancing system efficiency. Finally, a simulation model was developed in PLECS to validate the effectiveness of the proposed control strategy.