中文摘要：

为降低硬开关逆变器的开关损耗，提出了一种基于单独储能电容辅助换流的并联谐振直流环节软开关逆变器，其辅助谐振电路利用单独的储能电容为谐振过程提供能量，使直流母线电压波形周期性形成零电压凹槽，为逆变器的主开关提供零电压切换条件，同时辅助开关器件在逆变器换流过程中也实现了零电压开关或零电流开关。该逆变器避免了在直流母线之间串联多个储能电容为谐振过程提供能量，无中性点电位变化问题。文中建立了谐振过程的相平面来分析其工作原理。制作了一台5kW的实验样机，实验结果表明逆变器的主开关实现了软开关，所以该软开关逆变器能有效地降低开关损耗和提高效率。

英文摘要：

A parallel resonant DC link soft-switching inverter with a single storage capacitor-assisted commutation was pro-posed to reduce switching loss of the hard-switching inverter.The single storage capacitor was used to supply energy in the reso-nance process.DC-bus voltage decreased to zero periodically to realize zero-voltage operation of all main switching devices in in-verter.Auxiliary switches were also operated under zero voltage switching or zero current switching in the commutation process. More storage capacitors were not between the DC buses and there was no center tap potential variation problem.The operation prin-ciple was analyzed via the phase-plane analysis technique.A 5kW laboratory prototype was built.The experimental results demon-strated that soft-switching operation of all main switching devices could be realized.Therefore,the soft-switching inverter presented can effectively reduce switching loss and improve efficiency.