宽范围软开关PWM全桥模块化多电平DC-DC变换器的比较分析

本文分析了2种宽范围软开关全桥(full bridge,FB)模块化多电平DC-DC变换器(modular multi-level DC-DC converters,MMDCs),并对2种MMDCs进行了比较评价。所讨论的拓扑结构具有传统FB MMDC的所有优点,初级开关上的电压应力更小,不增加初级钳位装置和模块化主结构。此外,各变换器的初级开关可以在大负载范围内获得零电压开关(zero voltage switch,ZVS)或零电流开关(zero current switch,ZCS)。根据软开关特性、电流应力、功率损耗分布等性能、元件和拓扑结构指标,对所提出的FB MMDCs进行了分析和评价。实验结果也验证了新拓扑的可行性和优越性。

Comparative Evaluation of Full-Bridge Modular Multilevel DC-DC Converters with Wide-Range Soft-Switching PWM

The paper discusses two wide-scope soft-switching multi-level DC-DC Converters(MMDCs),and a comparative evaluation of these FB MMDCs is also presented.The discussed topologies have all merits belonging to conventional FB MMDCs,for example,smaller voltage stress on the primary switches,and no added primary clamping devices and modular primary structure.In addition,the primary switches of each converter can obtain zero voltage switch(ZVS)or zero current switch(ZCS)in a wide load range.The proposed FB MMDCs are assessed and evaluated based on their performance,components and topology structure indices,such as soft switching characteristics,current stress,power loss distribution,number of added devices and complexity of structure.Experimental results verify the feasibility and advantages of the new topologies.