基于对偶原理的IGBT并联均流缓冲电路研究  

Research on Current Sharing Snubber of Parallel IGBTs Based on Duality Principle

作　　者：王嘉智 吴小涛 刘福临 刘乾易 邹润民[1] WANG Jiazhi;WU Xiaotao;LIU Fulin;LIU Qianyi;ZOU Runmin(School of Automation,Central South University,Changsha 410083,Hunan Province,China;The 710 Research Institute of China Shipbuilding Industry Group Co.,Ltd.,Yichang 443003,Hubei Province,China)

机构地区：[1]中南大学自动化学院,湖南省长沙市410083 [2]中国船舶重工集团有限公司第七一〇研究所,湖北省宜昌市443003

出　　处：《中国电机工程学报》2023年第10期3962-3971,共10页Proceedings of the CSEE

基　　金：湖南省重点研发计划项目(2020WK2007)。

摘　　要：多个绝缘栅双极型晶体管(insulategatebipolar transistor,IGBT)并联是大功率电力电子应用领域提高设备电流等级的一条重要途径,而实现IGBT之间的并联均流则是保证其安全稳定运行的关键。文章在对IGBT串联均压缓冲机理研究的基础上,从在IGBT两端并联电容可降低电压变化率的原理出发,推断出可通过串联电感来抑制IGBT电流的变化,进而应用对偶原理构建出一类基于串联电感的并联均流缓冲电路及其改进型拓扑。结合模态图从理论上分析新型缓冲电路工作原理,发现所提出IGBT并联均流缓冲电路具备结构简单、易于实现的优点,还兼具静态和动态均流效果。仿真和实验表明所提出方法可以有效抑制过电流,降低电流不均衡度。Parallel connection of multiple insulate gate bipolar transistors(IGBTs)is an important approach to improve the current rating of devices in high-power applications of power electronics.And,the key to ensure the safe and stable operation of parallel IGBTs is to realize current sharing for them.Based on the research of the mechanism of existing voltage sharing snubbers of series IGBTs,it is deduced that the variation of IGBT current can be suppressed by series inductors,since the parallel capacitors can decrease the voltage change rate.And then,current sharing snubbers based on series inductors and their improved topologies are constructed by duality principle.The operating principle of novel snubbers is theoretically analyzed by combining with the modal diagrams.It is found that the proposed current sharing snubbers of parallel IGBTs not only possess the advantages of simple structure and easy implementation,but also have the effect of current sharing both in static and dynamic.Simulation and experimental results show that the proposed method can effectively suppress the overcurrent and reduce current imbalance.

关 键 词：绝缘栅双极型晶体管并联 串联电感 对偶原理 均流 缓冲电路 

分 类 号：TM46[电气工程—电器]