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ZhaiL
Employee
Employee
10 sign-ins 10 questions asked 5 questions asked

英飞凌干货|大功率二极管晶闸管知识连载——损耗
https://zhuanlan.zhihu.com/p/450767857
谢谢!但是您强调小电流情况下,难道大电流的情况会不一样吗?

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喜马拉雅之雪
Employee

亲,所谓小电流,其实并非真的很小电流,而是与额定值相比,不超额定情况。

述其根源,实质是:文章中提及的计算方法是两折线法。不同工作电流下,等效的反电势与体电阻值不等。如从数据表中攫取的图示:

_0-1670819615154.png

 

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喜马拉雅之雪
Employee

亲,所谓小电流,其实并非真的很小电流,而是与额定值相比,不超额定情况。

述其根源,实质是:文章中提及的计算方法是两折线法。不同工作电流下,等效的反电势与体电阻值不等。如从数据表中攫取的图示:

_0-1670819615154.png

 

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喜马拉雅之雪
Employee

基于安全,我们通常会用较大电流下的折线计算。

但小电流温升计算值明显偏高。所以;如果是大马拉小车还是马、车匹配,都需要按实际应用选择合适折线。

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