软开关双向直流变换器buck工作模式分析  

Research on buck Working Mode of Soft-switching Bidirectional DC-DC Converter

作　　者：张春丽[1] 

机构地区：[1]许昌学院电气工程学院,河南许昌461000

出　　处：《科技创新与生产力》2016年第12期65-68,共4页Sci-tech Innovation and Productivity

基　　金：国家自然科学基金项目(11504316);河南省青年骨干教师项目(GGJS-170);河南省教育厅重点项目(15A140013)

摘　　要：针对双向直流变换器效率不高的问题,提出了一种带有源缓冲电路的软开关双向直流变换器,阐述了软开关双向直流变换器的电路结构和工作原理,讨论了零电压开关的实现条件,分析了实验结果,并在理论分析的基础上试制了一台200 W样机。通过研究可知:变换器通过有源缓冲电路实现了其开关管的软开关,并且很好地解决了开关管寄生二极管的反向恢复问题,使变换器在具有较高效率的同时又能够稳定输出;变换器在buck工作模式下实现了开关管的零电压开关,有效减少了变换器的开关损耗;与传统双向直流变换器相比,带有源缓冲电路的软开关双向直流变换器在较大的负载范围内具有最优效率曲线,表现出良好的性能。Aiming at the problems of bidirectional DC-DC converter like low efficiency, this paper proposed a soft-switching bidirectional DC-DC converter with active snubber circuit, described its circuit structure and work principle, discussed the re- alization condition of zero-voltage switching, and a 200 W prototype was fabricated. The research results show that the con- verter with active snubber circuit achieves soft switching, solves the problem of parasitic diode reverse recovery and keeps higher efficiency and stable output. In buck working mode, the converter achieves zero voltage switching and effectively re- duces the switching losses. Compared with the traditional bidirectional DC-DC converter, the soft-switching bidirectional DC-DC converter with active snubber circuit has optimal efficiency curve in the greater range of load and shows good per- formance.

关 键 词：双向直流变换器 软开关 有源缓冲电路 

分 类 号：TM46[电气工程—电器]