一种具有宽输出调压范围与低电压应力的单级无桥隔离型PFC变换器  

A Single-Stage Bridgeless Isolated PFC Converter with Wide Output Voltage Range and Low Voltage Stress

作　　者：孙凯 贲洪奇[1] 孟涛[2] 赵志强 丁明远 Sun Kai;Ben Hongqi;Meng Tao;Zhao Zhiqiang;Ding Mingyuan(School of Electrical Engineering and Automation,Harbin Institute of Technology,Harbin 150001 China;School of Mechanical and Electrical Engineering Heilongjiang University,Harbin 150006 China)

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001 [2]黑龙江大学机电工程学院,哈尔滨150006

出　　处：《电工技术学报》2022年第8期1991-2005,共15页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51377036)。

摘　　要：针对单级无桥隔离型功率因数校正(PFC)变换器存在开关管电压应力大,工作于降压模式时,总谐波畸变率(THD)高、功率因数(PF)低的问题,提出一种具有宽输出调压范围与低电压应力的单级无桥隔离型PFC变换器。该变换器采用双绕组分裂电容的结构,降低了开关管与二极管的电压应力。通过引入工频开关管,消除变换器工作于降压模式时的输入电流畸变,实现降压模式下的高功率因数,从而有效拓宽输出电压的调节范围。变换器工作于断续导通模式(DCM)时,可实现二极管的零电流关断(ZCS)。详细分析变换器的工作原理和运行特性,并通过软件进行仿真证明,最后通过搭建一台50W实验样机,验证了该变换器能工作于较宽输出电压范围,具有开关管电压应力小、功率因数高、控制简单和转换效率高等优点。Since the single-stage bridgeless isolated power factor correction(PFC) converter has high voltage stress of the MOSFET, low power factor and high total harmonic distortion when it works in the Buck mode, a novel single-stage bridgeless isolated PFC converter is presented. This converter adopts a dual-winding split capacitor structure, which reduces the voltage stress of the MOSFET and the diodes. The power frequency MOSFET can eliminate the input current distortion, there by effectively realizing high power factor in Buck mode and broadening the range of output voltage. When the converter works in discontinue conduction mode(DCM), zero current switching(ZCS) of the diode can be achieved. The working principle and operating characteristics of the converter are analyzed in detail. Finally, a 50W experimental prototype is built to verify that the converter can work in a wide output voltage range, and has the advantages of small device voltage stress, low THD, high power factor, simple control method and high conversion efficiency.

关 键 词：单级无桥隔离型PFC变换器 宽输出调压范围 低电压应力 高功率因数 

分 类 号：TM461[电气工程—电器]