针对脉冲等离子体推力器（PPT）高压储能电容充电这一应用背景，研究了一种新型LCC-LC谐振变换器。该变换器在保留了LCC谐振网络基本特性的同时，引入了零增益点，使谐振变换器具有负载短路保护和缓启动功能，且相比于LCC谐振变换器的工作频率调整范围更窄，有利于磁集成和功率密度的提升。利用基波分析法和阻抗分析法分析了高阶LCC-LC谐振腔的特性，并基于此进行工作区间划分，确保LCC-LC谐振变换器宽负载范围内实现软开关；针对LCC-LC谐振变换器的高效运行，给出了一整套参数优化设计方法。最后，通过仿真和1 kW的原理样机实验数据，对所研究的变换器各项功能进行了验证。

This paper studies a new type of LCC-LC resonant converter for the application background of high voltage storage capacitor charging of pulsed plasma thruster (PPT). While keeping the basic characteristics of LCC resonant network, the converter is provided with zero gain point, which makes the converter have the functions of load short-circuit protection and slow start. Compared with LCC resonant converter, the new converter’s working frequency adjustment range is narrower, which is conducive to magnetic integration and power density improvement. The characteristics of high-order LCC-LC resonator are analyzed by fundamental wave analysis and impedance analysis. Based on the analysis, the working range is divided to ensure that the LCC-LC resonant converter can realize soft switch in a wide load range. Aiming at efficient operation of the LCC-LC resonant converter, parameters are optimized. Finally, the functions of the converter are verified by the simulation and the experimental data of the 1 kW prototype.