IGCT驱动关断电路及续流回路参数提取  

Parameter Extraction of Driving Shutdown Circuits and Freewheeling Circuits of IGCT

作　　者：王佳蕊[1] 孔力[1] 周亚星[1] 李鲁阳[1] 祁晓敏[1] 

机构地区：[1]中国科学院电工研究所,北京市海淀区100190

出　　处：《中国电机工程学报》2017年第18期5420-5426,共7页Proceedings of the CSEE

摘　　要：集成门极换流晶闸管(integrated gate commutated thyristor,IGCT)关断暂态时,其电流迅速由阴极换向到门极,且IGCT反并联二极管因承受正向偏压而导通,故IGCT关断暂态特性受其门极驱动关断电路及其反并联二极管运行特性影响。基于IGCT关断暂态换流机制及反并联二极管的工作原理,提出IGCT关断暂态时门极换流晶闸管(gate commutated thyristor,GCT)、驱动电路与反并联二极管所构成续流回路的等效电路,详细分析反并联二极管不同工况时等效电路结构及其运行特性的变化。结合IGCT关断暂态其端电压及等效电路各支路电流的实验结果,给出IGCT驱动关断电路及续流回路参数的提取方法。通过不同箝位电压与关断电流时实验结果与理论分析的对比,并考虑参数提取结果的一致性,充分证明等效电路与理论分析的正确性及参数提取方法的有效性。The current of the integrated gate commutated thyristor （IGCT） is quickly reversed from the cathode to the gate during the IGCT turn-off period, while the anti-paralleled diode is turned on due to the forward bias voltage, therefore the turn-off transient characteristics of the IGCT are influenced by the shutdown circuit of the gate driver and the operating characteristics of the anti-paralleled diode. Based on the commutation mechanism during the IGCT turn-off period and the working principle of the anti-paralleled diode, the equivalent circuits of the freewheeling circuit composed of the gate commutated thyristor （GCT）, the driver circuit and the anti-paralleled diode during the turn-off period were proposed, and the transformations of the structure and operating characteristics of equivalent circuits were detailed analyzed under different conditions of the anti-paralleled diode. A parameter extraction method of the shutdown circuit of gate driver and the freewheeling circuit was obtained by combining the experimental results of the terminal voltage of IGCT and all branch currents of the equivalent circuit during the IGCT turn-off period. Through the comparison of theoretical analysis and experimental results of different clamping voltages and turn-off currents, and considering the consistency of parameter extraction results, the validities of equivalent circuits, theoretical analysis and the parameter extraction method were well-proven.

关 键 词：集成门极换流晶闸管 门极驱动关断电路 反并联二极管 等效电路 参数提取 

分 类 号：TM46[电气工程—电器]