中文摘要：

为提高逆变器的转换效率,提出了一种具有低能耗辅助谐振电路的并联谐振直流环节逆变器.在传统硬开关逆变器的直流环节添加辅助谐振电路,使直流母线电压周期性地归零,实现逆变桥主开关器件的零电压开关,而且辅助开关器件也可以实现零电压关断和零电流开通.此外,其辅助谐振电路只有一个辅助开关器件,控制简单;辅助开关和谐振元件都位于直流母线的并联支路上,有利于降低辅助谐振电路的能耗.对其工作原理进行分析,给出不同工作模式下的等效电路图和软开关的实现条件.制作一个5kW的实验样机,通过实验结果验证该软开关逆变器的有效性.

英文摘要：

A parallel resonant DC link inverter with low-loss auxiliary resonant circuit was proposed to improve efficiency of the inverter. Auxiliary resonant circuit was added to DC link of conventional inverter to make DC-bus voltage decreased to zero pe- riodically, which realized zero- voltage operation of all switching devices in inverter. Auxiliary switching devices could also be turned on under zero-current and turned off under zero-voltage. In addition, only one auxiliary switch was in auxiliary resonant circuit so that control strategy was simple;auxiliary switch and resonant devices were all in parallel with DC-bus to reduce loss of auxiliary resonant circuit. The operation principle was analyzed. The equivalent circuits at different operation modes and conditions for realization of soft-switching were presented. A 5kW laboratory prototype had been built. Experimental results were demonstrated to confirm validity of soft-switching inverter presented.