一种可工作于CCM模态的高效图腾柱无桥PFC变换器  

A High Efficiency Totem-pole Bridgeless PFC Converter in CCM Mode

作　　者：章治国[1] 李世锋 李鑫[1] 程鹏铭 罗全明[2] ZHANG Zhiguo;LI Shifeng;LI Xin;CHENG Pengming;LUO Quanming(Energy Internet Engineering Research Center of Chongqing City(Chongqing University of Technology),Ba'nan District,Chongqing 400054,China;State Key Laboratory of Power Transmission Equipment&System Security and New Technology(Chongqing University),Shapingba District,Chongqing 400044,China)

机构地区：[1]重庆市能源互联网工程技术研究中心(重庆理工大学),重庆市巴南区400054 [2]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400044

出　　处：《中国电机工程学报》2022年第5期1957-1967,共11页Proceedings of the CSEE

摘　　要：提出一种具有零电压开通(zero-voltageswitching,ZVS)和零电流关断(zero-current switching,ZCS)的可工作于CCM腾柱式无桥功率因数校正(power factor correction,PFC)电路拓扑。该拓扑在传统图腾柱无桥PFC的基础上,通过增加辅助谐振支路来实现功率开关管(MOSFET)的ZVS导通,同时辅助谐振支路亦可有效地抑制其体二极管电流的di/dt,实现ZCS关断,极大地缓解了MOSFET体二极管反向恢复问题;工作在电流断续模态下的辅助谐振支路,其开关管均能实现零电流开通,变换器的所有开关管均工作在软开关状态。该拓扑克服传统硅基图腾柱无桥PFC的MOSFET体二极管反向恢复问题,以及只能工作在电流断续导电模式或临界导电模式的限制,拓宽其工作范围,与传统图腾柱式无桥PFC电路相比,有更高的效率和功率密度。基于对所提出变换器的工作原理和稳态特性的分析,设计一台实验样机,实验结果验证了该拓扑方案的可行性和有效性。A totem-pole bridgeless power factor correction(PFC) circuit topology with zero-voltage switching(ZVS) and zero-current switching(ZCS) for continuous conduction mode(CCM) was proposed. Based on the traditional totem-pole bridgeless PFC circuit, the auxiliary resonant branch was added to realize ZVS conduction of the main switches(MOSFETs).At the same time, the auxiliary resonant branch could effectively suppress the di/dt of the current flowing through the MOSFET body diodes, which made the MOSFETs turn off with ZCS. It greatly alleviated the reverse recovery problem of MOSFET body diodes. The auxiliary resonant branch operated in the discontinuous conduction mode. All the auxiliary switches of the converter turned on with ZCS, and all switches of the converter worked in soft switching state. The topology overcame the reverse recovery of MOSFET body diodes in traditional silicon-based totem-pole bridgeless PFC and the limitation that it only works in the discontinuous conduction mode(DCM) or boundary conduction mode(BCM). It widened the working range, and had higher efficiency and power density than the traditional totem-pole bridgeless PFC circuit. Finally, a prototype of AC/DC bridgeless PFC was constructed to verify the feasibility and effectiveness of the topology.

关 键 词：图腾柱无桥PFC变换器 零电压开通 零电流关断 连续导电模式 辅助谐振支路 

分 类 号：TM46[电气工程—电器]