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cross mob
235
Level 2
Level 2
5 questions asked First solution authored First like given

在进行IGBT的退饱和检测时,如何才能将检测值降低或者将阈值电压降低?

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1 解答
yifei_y
Moderator
Moderator
Moderator
25 likes received 100 solutions authored 100 sign-ins

根据VDESAT = Vt + VDDESAT + VRDESAT +VZ

齐纳二极管起到分压的作用,它两端电压达到VZ时反向导通并保持VZ的压降。在其他参数不变的情况下同样可以降低Vt

 

在原帖中查看解决方案

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5 回复数
yifei_y
Moderator
Moderator
Moderator
25 likes received 100 solutions authored 100 sign-ins

您好。

根据公式VDESAT = Vt + VDDESAT + VRDESAT,

VDESAT为9V左右的固定值,想降低Vt可以通过增大VDDESAT(串联N个二极管)或者增大VRDESAT(通过增大RDESAT的值)实现

yiye_4841451_2-1700101324012.png

 

 

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235
Level 2
Level 2
5 questions asked First solution authored First like given

后面反串一个齐纳二极管的话选型怎么考虑呢?

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235
Level 2
Level 2
5 questions asked First solution authored First like given

有一个电路是再反串一个二极管在DESAT二极管的后面是?

235_0-1700106386374.png

 

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yifei_y
Moderator
Moderator
Moderator
25 likes received 100 solutions authored 100 sign-ins

根据VDESAT = Vt + VDDESAT + VRDESAT +VZ

齐纳二极管起到分压的作用,它两端电压达到VZ时反向导通并保持VZ的压降。在其他参数不变的情况下同样可以降低Vt

 

0 点赞
235
Level 2
Level 2
5 questions asked First solution authored First like given

那这个齐纳二级管怎么去选型呢,谢谢

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