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IGBT开关瞬态的温度特性与电热仿真模型

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Keywords: 绝缘栅双极型晶体管,开关瞬态,温度特性,电热模型,仿真研究

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Abstract:

由于半导体的材料特性随温度的变化发生改变,采用硅材料制造的绝缘栅双极型晶体管(IGBT)的工作特性受温度的影响也十分显著,开关瞬态过程将随温度发生较大变化。针对不同温度下的开关过程开展了测试实验,发现IGBT的开通与关断瞬态具有不同的温度特性,根据实验现象对IGBT的开关过程进行了分析,得出IGBT开关瞬态的温度特性主要是受载流子寿命影响的结论。对IGBT电热模型的基本原理以及现有模型方法进行了分析,根据实验中得出的结论,提出了一种改进的IGBT电热模型。基于该模型对IGBT关断时的电流拖尾过程以及整个开关瞬态过程开展了电热仿真分析,通过仿真波形与实测波形的比较,验证了实验中得出的结论以及该模型的准确性。

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