中文摘要：

为减小位于逆变器直流环节的辅助谐振电路的损耗,提出一种新型的辅助电路与直流母线并联的谐振直流环节软开关逆变器,其直流母线上没串联辅助开关器件和谐振元件,而且辅助谐振电路中只有1个储能电容,无中性点电位的变化问题。依据不同工作模式下的等效电路图,分析电路的换流过程和设计规则,并建立起辅助谐振电路损耗的数学模型,讨论谐振参数对辅助电路损耗的影响。制作1台5 k W的实验样机,实验结果表明逆变器的工作过程符合原理分析,能实现软开关功能,而且相比于同类型软开关逆变器,效率得到了进一步提高。因为该软开关逆变器的辅助电路与直流母线并联,辅助电路损耗相对较低,所以有利于在高功率领域提高逆变器效率。

英文摘要：

A novel resonant DC-link soft-switching inverter including auxiliary circuit parallel with DC bus was proposed to reduce loss of auxiliary resonant circuit on the DC-link of the inverter. Auxiliary switches and resonant elements were not on the DC bus of the novel topology and only one storage capacitor was in the auxiliary circuit. There was no center tap potential variation problem. According to equivalent circuits under different modes,commutation process of the circuit and design rule were analyzed. The mathematical model for auxiliary resonant circuit loss was established and the influence of resonant parameters on the loss of auxiliary circuit was discussed. A 5 k W laboratory prototype was built. The experimental results demonstrated that working process of the inverter accorded with theoretical analysis and performance of soft-switching was realized. In addition,compared with same type of soft-switching inverters,efficiency of the inverter was improved further. Because auxiliary circuit is parallel with DC bus in the inverter and the loss of auxiliary circuit is relatively low,it is helpful to improve efficiency of the inverter in the high power field.