新型无源软开关BoostPFC电路研究

提出一种无源软开关Boost PFC电路及其实现方法.其电路拓扑结构由传统的Boost PFC和无开关损耗的缓冲电路构成.缓冲电路通过谐振电感、电容和两个隔离二极管使Boost主开关器件工作在ZVS和ZCS软开关模式.介绍了新型无源软开关PFC的运行原理;给出了缓冲电路的参数选取,并运用PSPICE进行了电路运行的仿真分析;搭建了一台500W/25 kHz实验电源验证了电路的正确性.仿真和实验结果表明,新型PFC电路工作在软开关模式,可实现单位PFC.且平均输出效率提高了约4%.

Research on a Novel Passive Soft-Switch Boost PFC Converter

A novel power factor correction(PFC) converter with a passive lossless soft-switch was introduced.The basic circuit topology of the proposed converter consisted of a traditional single-switch Boost PFC and a lossless passive snubber.The snubber which made the converter working at the ZVS and ZCS mode was composed of an auxiliary resonant induc-tor,a resonant capacitor and two diodes for insulating current.Furthermore,the operating principle of the converter was dis-cussed,and the calculation of parameters was given.The simulation about the circuit efficiency was done by PSPICE.Final-ly,a 500 W/25 kHz experimental converter was built to validate the rationality.The simulative and experimental results show that the new PFC converter can operate in the soft-switch condition,achieves the unity power factor,and improves the average output efficiency up to 4% nearly.