一种基于软开关三电平DC/DC开关电源的研制  

Development of a Three-level DC/DC Switch Power Supply Based on Soft-switch

作　　者：张永春[1] 刘星桥[2] 

机构地区：[1]常州工学院,电子信息与电气工程学院,江苏常州213002 [2]江苏大学,电气信息工程学院,江苏镇江212013

出　　处：《电力电子技术》2012年第11期38-40,共3页Power Electronics

基　　金：江苏省自然科学基金项目(BK2008228)~~

摘　　要：提出了一种新型具有无源箝位网络的零电压零电流转换(ZVZCS)半桥三电平直流变换器,其特点是通过次级无源箝位网络实现超前桥臂在一定负载范围内的ZVS和滞后桥臂的ZCS。对变换器工作原理及软开关实现条件进行了详细分析,并在Pspice 9.2环境下对变换器进行了仿真实验,结果表明该拓扑能实现所有功率开关管的软开关及二极管的软换流,且次级电压应力较低。在实验样机上进行了测试分析,实验结果与理论分析一致,进一步验证了该新型DC/DC变换器的可行性和正确性。此外,该变换器还在一定程度上改善了传统ZVZCS三电平变换器的占空比丢失问题,使整机功率损耗小、效率高。A novel zero-voltage and zero-current switching（ZVZCS） half-bridge three-level DC/DC converter with passive clamping network is presented.By the secondary side passive clamping network ,the converter realizes leading-bridge＇s ZVS in a certain range of load and lagging-bridge＇s ZCS.The working principle of the converter and the achieving condition of soft-switch are analyzed in detail.The simulation resuhs under Pspice 9.2 show that it can achieve ZVS/ ZCS for all of the active switches and diodes, and it has low secondary voltage stress.The experimental results of the prototype are consistent with the theory＇s analysis and the simulation results, it shows the converter is feasible and correct.Furthermore, it improves the duty losing problem faced by the conventional ZVZCS three-level converters,thus reduces the loss and improves the efficiency.

关 键 词：变换器 软开关 三电平 电压应力 

分 类 号：TM46[电气工程—电器]