中文摘要：

为解决有源钳位谐振直流环节逆变器钳位电路中需设置独立钳位电源（通常用大电容代替）及辅助电路含有多个辅助开关器件的问题,设计出一种新型无源钳位谐振直流环节逆变器的拓扑结构。这种新型逆变器的钳位电路中无独立设置的钳位电源,在耦合电感的作用下,可将该逆变器的直流环节电压钳位在输入直流电压的1.1~1.3倍,有效地降低了电压应力。辅助谐振电路中只有一个辅助开关器件,有利于简化控制和降低硬件成本。根据各个阶段下的等效电路,分析了电路的工作过程和软开关实现条件,并进行了实验验证,实验结果表明开关器件实现了软开关,而且在额定功率3k W下,逆变器效率达到96%。因此,该拓扑结构能够有效地降低开关损耗,并提高工作效率。

英文摘要：

A novel passively clamped resonant DC-link inverter topology was designed to solve the problem that active clamped resonant DC-link inverter need to set independent clamped power which usually uses a large capacitor instead of it, and there were more than one auxiliary switch in auxiliary circuits. This novel inverter need not set independent clamped power , and there was only one auxiliary switch in the auxiliary resonant circuit. It was beneficial to simplify control and reduce the hardware cost. Main and auxiliary switches achieved soft switching during commutation process of the inverter. Under the action of coupled inductors, the DC-link voltage can be clamped at 1.1-1.3times of input DC voltage, which reduced the voltage pressure effectively. According to equivalent circuits under different stages, the paper analyzed the working process of the inverter and realization conditions of the soft switching. The experimental results demonstrated that the switching device achieved soft switching and efficiency reached 96% under the rated power 3kW. Therefore, the proposed topology can reduce switching loss and improve efficiency.