基于整流补偿基波近似法的LCC谐振变换器参数设计

Parameters design of LCC resonant converter base on rectifier-compensated first harmonics approximation

为解决因输出整流桥的存在而导致的LCC串并联谐振变换器谐振参数分析与计算复杂化这一问题,提出了利用整流补偿基波近似法对静电除尘用的具有电容型滤波器的LCC串并联谐振变换器负载进行线性化等效,将谐振变换器的并联电容、整流桥和负载等效为线性的RC串联电路,降低了变换器特性分析和参数计算的难度;在此基础上以18 k V/100 m A的高频静电除尘高压直流电源为例,给出了具有电容型滤波器的LCC谐振变换器参数的设计方法和设计参数,并用PSIM仿真软件进行了验证。研究结果表明:通过该方法设计出的谐振电路参数与实际的LCC谐振电路误差较小,针对高频高压静电除尘器电源的非线性负载,可以较为简便且准确地获得线性化等效模型;该方法对LCC串并联谐振变换器的参数设计和特性分析具有指导意义。

In order to solve the problem of the analysis and calculation of resonant parameters, that is complexed due to the existence of output rectifier in LCC series-parallel resonant converter, the nonlinear load of C-filter LCC series-parallel resonant converter was linearized by using Rectifier-compensated first harmonics approximation （RCFHA） and the equivalent model composes RC series circuit, which simplified the analysis and parameters calculation of the resonant converter. A simple design procedure was presented by the example of an 18 kV/ 100 mA high-voltage DC power supply applied in the electrostatic precipitators based on the analysis, the accuracy of the equivalent model and design method was verified by the simulation in PSIM. The research results show that there is little error between the parameters designed by the method and the actual LCC resonant converter, the accuracy linearized equivalent model can be obtained easily for the electrostatic precipitators by the method, and that will be guidance significance in parameters calculation and characteristics analysis for the LCC seriesparallel resonant converter.