摘要
为解决传统DC/DC移相全桥变换器轻载零电压开通(Zero-Voltage Switching,ZVS)性能丢失与副边侧二极管严重的反向恢复问题,本文通过将传统DC/DC移相全桥变换器副边侧的滤波电感前移至原边侧,实现重载下原边侧全部开关管的ZVS特性,轻载下滞后桥臂开关管的零电流开通与关断(Zero-Current Switching,ZCS)特性.该拓扑可实现副边二极管的电流在重载下自然过零,轻载下进入电流断续模式(Discontinuous Conduction Mode,DCM),有效削弱二极管反向恢复问题.通过对该拓扑电流连续模式(Continuous Conduction Mode,CCM)与DCM模式进行详细分述,阐明ZV-ZCS特性的实现机理,通过建立该拓扑不同模式下的增益方程,推导关键参数的设计法则,最后通过PSIM仿真与2 kW的实验样机验证了该拓扑的性能与理论分析的正确性.
To solve the loss of zero-voltage switching(ZVS)performance of traditional DC/DC phase-shifted full-bridge converters under light load and the serious reverse recovery problems of the secondary diodes,in this paper,by moving the filter inductor on the secondary side of the traditional DC/DC phase-shifted full-bridge converter to the primary side,the zero-voltage switching(ZVS)performance of all the switches in the primary-side under heavy load is achieved,and the zero-current switching(ZCS)performance of switches in the lagging bridge can be achieved under light load.In addition,the current of the secondary-side diodes obtains natural zero-crossing characteristics under heavy load and enters in discontinuous conduction mode(DCM)under light load,which effectively weakens the diode reverse recovery problem.Continuous conduction mode(CCM)and DCM of the topology are described in detail,and the realization mechanism of ZV-ZCS characteristics is clarified.By establishing the gain equations in different modes of the topology,the design rules of key parameters are inferred.Finally,simulation based on PSIM software and a 2 kW experiment prototype are developed to verify the characteristic of the topology and the correctness of the theoretical analysis.
作者
陈仲伟
李奎
程怡捷
汪洪亮
冷阳
刘浩田
CHEN Zhongwei;LI Kui;CHENG Yijie;WANG Hongliang;LENG Yang;LIU Haotian(Limited Economic&Technical Research Institute,State Grid Hunan Electric Power Company,Changsha 410004,China;Hunan Key Laboratory of Energy Internet Supply-Demand and Operation,State Grid Hunan Electric Power Company,Changsha 410004,China;College of Electrical and Information Engineering,Hunan University,Changsha 410082,China;Changsha Power Supply Company,State Grid Hunan Electric Power Company,Changsha 410007,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第8期103-113,共11页
Journal of Hunan University:Natural Sciences
基金
国家重点研发计划政府间国际科技创新合作重点专项资助项目(2018YFE0125300)
湖南省科技创新平台与人才计划资助项目(2019TP1053)。
关键词
直流变换器
移相全桥
零电压开通
零电流关断
DC-DC converters
phase-shifted full-bridge
zero voltage switching
zero current switching
