A MOSFET is often applied as the switch in medium and small power single-phase full-bridge inverters. In order to achieve efficient operation at a high switching frequency, a new efficient inverter is presented in this paper. In addition, two sets of identical auxiliary units are arranged on the two bridge arms. When the main switches need to be turned on in each switching period, the voltage across the resonant capacitor can become zero. Thus, the main switching device can achieve zero-voltage turn-on, which can eliminate the capacitive turn-on loss existing in the MOSFET and help with the efficient operation of the inverter. The working process of the auxiliary unit and the design rules of the parameters are analyzed. Experimental results indicate that the main switching device can work in the state of zero-voltage soft-switching, and that the rated efficiency in the inverter is equal to 98.9%. This is more than that of similar inverters. This topology is significant for studies on efficient single-phase full-bridge inverters with medium and small power.
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