一种采用无源辅助网络的ZVZCS三电平DC-DC变换器  

A ZVZCS Three-Level DC-DC Converter Using Passive Auxiliary Net

作　　者：孙铁成[1] 朱雪秦[1] 梁联[1] 王宏佳[1] 

机构地区：[1]哈尔滨工业大学电气工程系,哈尔滨150001

出　　处：《电子器件》2008年第3期890-893,897,共5页Chinese Journal of Electron Devices

摘　　要：提出一种采用无源辅助网络的零电压零电流开关(ZVZCS)三电平DC-DC变换器拓扑,其中各开关管电压应力为输入电压的一半,并且能够在宽负载范围内实现各开关管的软开关。副边的无源辅助网络不仅能为滞后管创造零电流关断条件,而且还可抑制变压器副边整流后电压的过冲。本文详细分析了此变换器的工作原理及开关管实现软开关的条件,并通过实验样机验证了理论分析的正确性及此拓扑的可行性。A ZVZCS three-level DC-DC converter using passive auxiliary net is proposed. The voltage stress of each power switch is only half of the input voltage. Besides, all the power switches can achieve soft-switching in a wide load range. The auxiliary net in the secondary side can not only create zero-currentswitching condition for lag switches but also clamp the peak voltage of the secondary side. The operation principle and the soft-switching condition are analyzed in detail. The validity of the analysis and the feasibility of this topology are verified by experimental results.

关 键 词：三电平变换器 零电压零电流开关 无源辅助网络 

分 类 号：TM46[电气工程—电器]