摘要
传统移相全桥变换器存在较难实现滞后桥臂开关管的软开关控制及转换效率较低等缺点,分析当前常用移相全桥拓扑,并提出了一种能够提升效率和实现软开关的新型拓扑。该拓扑在滞后桥臂换流时,通过对电流进行截断,再通过续流支路进行续流,实现滞后桥臂开关管的软开关。通过对新型移相电路拓扑各个工况进行分析,得到各桥臂上开关管实现软开关的条件,并对关键元件参数进行设计。最后在PSPice上搭建模型进行仿真分析,结果表明,新型拓扑可以实现两个桥臂的软开关控制和转换效率的提升。
Traditional phase-shifted full-bridge converters have disadvantages such as difficulty in implementing a lagging bridge soft switch and low conversion efficiency.Based on the analysis of the existing phase shifted full-bridge circuit topology,a new type of topology that can improve efficiency and implement soft switching was proposed.When the lagging bridge arm is commutated,the topology cuts off the current and then freewheels through the freewheeling branch circuit to realize the soft switching of the lagging bridge arm switching tube.By analyzing the various working conditions of the phase-shifting circuit topology,the conditions for soft switching of the switching tubes on each bridge arm were obtained,and the key component parameters were designed.Finally,a model was built by the PSPice for simulation analysis.The results show that the realization of the new topology can achieve the soft switching control for two bridge arms and improvement of conversion efficiency.
作者
揭贵生
季圣贤
高山
王恒利
王瑞田
JIE Guisheng;JI Shengxian;GAO Shan;WANG Hengli;WANG Ruitian(National key Laboratory of Science and Technology on Vessel Integrated Power System,Naval University of Engineering,Wuhan 430033,Hubei,China)
出处
《电气传动》
2021年第13期40-45,共6页
Electric Drive
基金
国家自然科学基金(51490681)。
关键词
移相全桥变换器
高转换效率
软开关
phase-shifted full-bridge converters
high conversion efficiency
soft switching
