为提高行波管高压电源变换器全工作状态的软开关和动态响应性能,分析了行波管负载的动态突变特性,设计了全桥LLC谐振倍压功率变换器,提出了基于自激移相控制的全桥LLC变换器的工作原理、大信号建模和设计方法,重点针对负载突变特性分析了变换器的瞬态软开关特性和控制参数设计原则。通过仿真验证了变换器在负载突变时能够实现开关管的零电压开通,说明了控制参数的自适应调整能够提高变换器的动态响应性能。通过实验分析了基于自激移相控制的全桥LLC变换器的典型波形,表明变换器具有较好的软开关特性。

In order to improve the soft switching and dynamic response characteristics of the traveling wave tube high voltage converter, the load characteristic of a traveling wave tube is analyzed, and a full bridge LLC resonant converter with a multiplier rectifier is designed. The working principle, modeling and designing methods of the LLC converter are given based on self-sustained phase shift modulation, especially the soft switching in transient condition and the designing guide of control parameter are analyzed. By simulation, the zero voltage switching in the load mutation condition is proved, and the dynamic response characteristic can be improved by changing the control parameter adaptively. By experiment, the typical wave form of LLC converter is further analyzed based on self-sustained phase shift modulation, and the experiment results show that the soft switching can be implemented.