IGBT与散热片之间的问题

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 楼主 | 2012-6-15 11:31 | 显示全部楼层 |阅读模式
最近遇到一个纠结的问题,各位帮帮忙,IGBT装散热片,装的很紧的话,栅源之间居然大约15V如果松点就正常脉冲方波,
| 2012-6-15 13:21 | 显示全部楼层
“居然大约15V”与“正常脉冲方波”怎么比较?
| 2012-6-15 13:25 | 显示全部楼层
同2L问
 楼主 | 2012-6-15 14:01 | 显示全部楼层
IGBT正常不是15V开通,而我需要调速,所以给一定占空比的方波,然而后来把散热片对IGBT又加紧点后,没有方波啦,取而代之的IGBT栅源之间15V,没有关断的时候
 楼主 | 2012-6-15 14:06 | 显示全部楼层
是这样的啊,IGBT开通需要15V,栅源之间我利用脉冲变压器产生15V一定占空比的方波,后来我把IGBT与散热片之间固定紧一点后,栅源之间不是一定占空比的方波啦。取而代之的是恒定的15V,晃动一下散热片又好啦,散热片与IGBT之间绝缘良好,谢谢高手解释一下
 楼主 | 2012-6-15 14:07 | 显示全部楼层
2# Lgz2006
是这样的啊,IGBT开通需要15V,栅源之间我利用脉冲变压器产生15V一定占空比的方波,后来我把IGBT与散热片之间固定紧一点后,栅源之间不是一定占空比的方波啦。取而代之的是恒定的15V,晃动一下散热片又好啦,散热片与IGBT之间绝缘良好,谢谢高手解释一下
是这样的啊,IGBT开通需要15V,栅源之间我利用脉冲变压器产生15V一定占空比的方波,后来我把IGBT与散热片之间固定紧一点后,栅源之间不是一定占空比的方波啦。取而代之的是恒定的15V,晃动一下散热片又好啦,散热片与IGBT之间绝缘良好,谢谢高手解释一下
| 2012-6-15 15:02 | 显示全部楼层
仅从“晃动一下散热片又好啦”这一句来揣测,这是IGBT/散热器系统之外的问题
| 2012-6-16 04:41 | 显示全部楼层
上图吧,测量是不是有短路现象
| 2012-6-16 07:54 | 显示全部楼层
1000%短路了
| 2012-6-16 08:46 | 显示全部楼层
非常认同LS的看法.
拧紧螺丝后,边沿毛剌引起短路啦!
 楼主 | 2012-6-16 09:53 | 显示全部楼层
谢谢各位啊,我新手,测了一下没有短路啊,所有引脚与散热片之间均没短路啊,我换了IGBT,把散热片去掉,结果不正常,动了一下IGBT又正常,虚焊的话也排除啦,因为我从IGBT焊盘上方引脚可是测量,该导通的也正常导通啊,纠结啊,再次感谢各位啊
 楼主 | 2012-6-16 10:23 | 显示全部楼层
谢谢各位,已经解决嘿嘿
| 2012-6-16 11:18 | 显示全部楼层
LZ太不厚道了:dizzy:
问题解决了也不说明一下,到底怎么回事
这样方便以后遇到同样问题的网友有个参考。。。。

12# xfx1989
| 2012-6-16 19:46 | 显示全部楼层
很简单,不是虚焊开路,就是碰件短路!既不用保密,更不用不好意思!
| 2012-6-17 18:10 | 显示全部楼层
看  看    !!!
 楼主 | 2012-6-18 10:50 | 显示全部楼层
不好意思啊  呵呵 一直在忙 今天看到 其实就是焊接的问题,但是是前级电路的焊接  由于我按散热片 引脚接触的好啦  所以就好 ,前级是达灵顿,SOP封装的   不好意思啊
谢谢大家  温暖啊
 楼主 | 2012-6-18 10:52 | 显示全部楼层
LGZ2006很牛 谢谢你  包括大家 我新毕业的 所以,,,,谢谢
| 2012-7-20 15:43 | 显示全部楼层
Currently I am seeking Application Engineer, Asia Pacific for my client – A New York Stock Exchange listed company with great financial report each year and it has collaborated with customers to solve their toughest challenges and deliver material technologies with the critical performance and reliability they demand. And our client has fourteen factories in worldwide, own human-based management. This person will cover Aisa(China/Korea/ Taiwan/Singapore) and visit German Curamik!30% AP Business Travel

As hiring manager proposed, candidates who are Know-how in design of power electronic modules and the related key requirements for thermal resistance (Rth), current, voltage, transistors and diodes
and candidates who are R&D/process or quality engineer from IGBT packaging companies which are their customers or technical engineer from competitors and suppliers is qualified.

Company Information: Our client is an American specialty materials company with over one hundred year’s history. It is a global leading manufacturer of specialty materials such as polymers, fillers and high performance elastomers for a variety of industries.

Job Title:                Application Engineer, Asia Pacific
Div/Corp:                PES/Curamik
Report to:                Director Marketing PES
Location:                Shanghai/Suzhou/Shenzhen/Korean/Hongkong/Singapore/Taiwan etc.

Job Purpose:  

•        The application engineer for AP is responsible for the technical support for curamik products for the Asian customers mainly in Japan, China and Korea

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•        Know-how in design of power electronic modules and the related key requirements for thermal resistance (Rth), current, voltage, transistors and diodes.
•        Technical support of customers:
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•        Deep understanding in the usage of ceramic substrates in the power module industry
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sophia.yan@consultcareer.com.cn
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