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IGCT的状态检测与逻辑控制

, PP. 261-269

Keywords: GCT,IGCT,集成门极驱动单元,硬驱动,状态检测

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Abstract:

门极驱动单元是集成门极换流晶闸管(IGCT)的重要组成部分。除了完成强触发导通与门极换流关断外,门极驱动单元还必须具备可靠的工作状态检测与逻辑控制功能。本文将从门极换流晶闸管(GCT)芯片的基本结构与IGCT驱动的基本原理出发,结合工业上广泛应用的NPC三电平拓扑,分析不同工况下GCT门阴极电位变化的基本机理,以及各个工况对门极驱动逻辑控制的要求。最后设计了一种带有精确状态检测功能的门极驱动单元,并在一个自主研发的NPC三电平功率模块上进行了功能测试。实验得到了各个工况下IGCT换流过程与门极驱动单元检测电路的实际波形,验证了门极驱动单元具有优异的状态检测与逻辑控制功能。

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