新型三相单开关功率因数校正器的研究

摘要

In order to solve the problem of high input current harmonic in conventional three-phase single-switch power factor corrector(PFC),a novel topological structure of three-phase single switch boost PFC circuit is pro⁃posed. Appropriate capacitor is inserted between boost inductor and rectifier bridge which can constitute second-or⁃der filter,although the control algorithm remains unchanged,it can optimize the input current THD(Total Harmonic Distortion)with high power factor. Initially,based on a brief analysis on the circuit principle,MATLAB Simulink model is built. Then the Boost PFC converter experiment platform is set up with the DSP TMS320F28335. Finally, the simulation and experimental results show that the design scheme is feasible,the measurement of the experimen⁃tal circuit achieves that the THD is less than 10%,and this converter is proved valuable.%为解决传统三相单开关功率因数校正器输入电流谐波较大的问题，设计了一种新型拓扑结构的三相单开关升压型PFC（Power Factor Correction）电路。通过在Boost电感和整流桥之间插入合适电容构成二阶滤波器，虽然控制算法不变，但可以在保证功率因数不变的前提下优化输入电流THD（Total Harmonic Distortion）。基于对电路原理的简要分析，建立MATLAB仿真模型，再以TMS320F28335为控制核心，搭建Boost PFC变换器的实验平台。仿真和实验均表明该方案可行，实验电路测试的输入电流THD值小于10%，具有实际应用价值。