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.

MOSFET通常用作中小功率单相全桥逆变器的开关。为了在高开关频率下实现高效运行，本文提出了一种新型高效逆变器。另外，在两个桥臂上布置了两组相同的辅助单元。当需要在每个开关周期中打开主开关时，谐振电容器两端的电压可能变为零。因此，主开关器件可以实现零电压导通，从而可以消除MOSFET中存在的电容性导通损耗，并有助于逆变器的高效运行。分析了辅助单元的工作过程和参数设计规则。实验结果表明，主开关设备可以在零电压软开关状态下工作，并且逆变器的额定效率等于98.9％。这比同类逆变器要多。该拓扑对于研究中功率和小功率的高效单相全桥逆变器具有重要意义。