中文摘要：

为解决谐振直流环节逆变器的直流母线上设置的辅助开关器件制约了其效率提高这一问题,提出一种新型谐振直流环节软开关逆变器拓扑结构,其直流母线上没串联辅助开关器件和谐振元件,有助于降低辅助谐振电路的损耗和提高效率. 此外,与同类型的软开关逆变器相比,与储能电容串联的辅助开关并联了额外的谐振电容,可以进一步降低关断损耗. 采用相平面分析法来研究拓扑结构的动力学行为、软开关条件以及设计规则,并建立分压电容的电压偏差量的数学模型.搭建了一台20 kW的实验样机,实验结果表明该软开关逆变器相比于硬开关逆变器,满载时的效率提高值不低于轻载时的效率提高值. 因此,该软开关逆变器能降低辅助谐振电路的能耗,保障电能的高效利用.

英文摘要：

One auxiliary switching device was usually on the DC bus of resonant DC link inverter, which blocked the improvement of efficiency. A novel resonant DC link soft-switching inverter was proposed to solve the problem. Auxiliary switches and resonant elements were not on the DC bus in the novel topolo-gy. It could reduce loss of auxiliary resonant circuit and enhance efficiency. In addition, compared with the same type of soft-switching inverter, extra resonant capacitor was in parallel with auxiliary switch which was in series with energy storage capacitors. It could further reduce turn-off loss. The phase-plane analysis technique was established in order to study transient dynamics, soft-switching condition and de-sign rule. The mathematical models for voltage deviation of voltage dividing capacitors were established. A 20 kW laboratory prototype was built. Experimental results demonstrate the value of improvements in efficiency at full load is no less than that at light load. Therefore, the proposed soft-switching inverter can reduce loss of auxiliary resonant circuit and ensure high power utilization ratio.