混合工作模态的高功率因数无桥Buck PFC变换器  

High Power Factor Buck-type Bridgeless PFC Converter with Hybrid Operation Modes

作　　者：陈正格 苗舒曼 周琛力 许建平[1] CHEN Zhengge;MIAO Shuman;ZHOU Chenli;XU Jianping(Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle of Ministry of Education,Southwest Jiaotong University,Chengdu 611756,China;CPSS)

机构地区：[1]西南交通大学磁浮技术与磁浮列车教育部重点实验室,成都611756 [2]中国电源学会

出　　处：《电源学报》2024年第3期156-164,共9页Journal of Power Supply

基　　金：四川省自然科学基金资助项目(2023NSFSC0813);香江学者计划资助项目(XJ2022029)。

摘　　要：AC-DC降压型功率因数校正PFC(power factor correction)变换器广泛应用于低压场合,为解决该类拓扑因输入电流死区导致功率因数PF(power factor)低、输入电流总谐波THDi(total harmonic distortions of input current)高的问题,首先引入Buck-Boost单元以构建1种高PF的混合工作模态降压型无桥PFC变换器,其在正、负半个工频周期分别工作在Buck和Buck-Boost模式。虽然Buck-Boost单元效率低于Buck单元,但所提变换器在负半工频周期运行于Buck-Boost模式,可以避免输入电流死区以提高PF并降低THDi。在正半工频周期运行于Buck模式,变换器仍保留Buck单元的高效率优势。其次,通过分析所提无桥变换器工作模态与PF值来证明变换器的高PF特性。最后,通过仿真实验,验证所提变换器的可行性和理论分析的正确性,并比较所提变换器与传统Buck PFC变换器的性能。AC-DC Buck-type power factor correction(PFC)converters are widely applied in low-voltage scenarios.However,they typically suffer from low power factor(PF)and high total harmonic distortions of input current(THDi)caused by the input current dead zones.To solve this problem,firstly,a high PF Buck-type bridgeless PFC converter with hybrid operation modes is proposed by introducing a Buck-Boost converter cell,which operates in the Buck and Buck-Boost modes in the positive and negative half-line cycles,respectively.Although the Buck-Boost cell’s efficiency is inferior to that of the Buck cell,the proposed converter can operate in the Buck-Boost mode in the negative half-line cycle,thereby minimizing the dead zones to improve PF and reduce THDi.The proposed converter operates in the Buck mode in the positive half-line cycle,inheriting the high efficiency of the Buck cell.Secondly,the operation modes and PF of the proposed bridgeless converter are analyzed to show its high PF feature.Finally,simulations and experimental tests were conducted to verify the feasibility and theoretical analysis of the proposed converter,and a comparison of performance between the proposed and conventional Buck-type PFC converters was also performed.

关 键 词：功率因数校正 无桥拓扑 混合工作模态 Buck模式 Buck-Boost模式 高功率因数 

分 类 号：TM46[电气工程—电器]