基于驱动信号同步的串联IGBT动态均压方法  

Dynamic Voltage Balancing Method of Series Connected IGBTs Based on Synchronizing Driver Signals

作　　者：李杨[1] 李博[2] 罗洋[3] 

机构地区：[1]重庆市电力公司江北供电局,重庆401147 [2]英国纽卡斯尔大学 [3]重庆大学电气工程学院,重庆400044

出　　处：《电气自动化》2012年第2期78-80,共3页Electrical Automation

摘　　要：为解决由驱动信号不同步引起的多个IGBT串联动态电压不均衡问题,以实现串联IGBT在大功率高电压场合的应用。在研究国内外多种IGBT动态串联均压技术的基础上,采用同步变压器和端电压钳位电路相结合以实现动态电压均衡,并对其工作原理进行了说明。然后运用Saber仿真软件,建立串联IGBT的动态均压仿真电路。仿真结果表明,动态均压电路在IGBT串联运行时不仅能够很好地抑制IGBT驱动信号不同步造成的动态电压不均衡,而且能够使开关瞬态的过电压≤10%,确保了串联IGBT的安全运行。This paper is focused on solving dynamic voltage imbalance of series connected IGBTs caused by the asynchrony drive signals of different IGBT, so series connection of IGBT devices can meet the requirements of high-voltage and high-power conversion. Based on researching the balancing methods of home and abroad, a suitable dynamic voltage balance can be guaranteed through adding simple circuits which combine synchronous transformer with voltage-clamp circuit in serial connections of IGBTs, and verified how the circuit works in detail. Then the dynamic voltage balancing simulation circuit is established by using the Saber simulation software. The results of simulation show that the dynamic voltage balancing circuit can not only diminish overvoltage across IGBTs obviously, but also the overvohage can be limited to no more than 10% of IGBT static voltage during switch transient. It is guaranteed that a circuit including IGBT series can be operated in the safe operation area.

关 键 词：IGBT 串联 动态均压 驱动信号 同步 钳位 

分 类 号：TM50[电气工程—电器]