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[SOLVED] Microcontroller based electronic load controller Igbt

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Einaznad

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Hi there, i m doing my Final year project on electronic load controller using igbt.. The problem im facing now is the igbt part which it suppose to chop off the Vce when there no voltage at igbt gate.. All i get is the Vce is always been chop to half of the input supply whenever there's voltage or non at the igbt gate.. Anyone can help me with it? Im using the irg4bC40w igbt.. Thanks in advance..


Schematic diagram.. https://db.tt/FSVhi9Ip

---------- Post added 31-05-12 at 00:13 ---------- Previous post was 30-05-12 at 23:56 ----------

Or anyone who have any idea of using the igbt in chop off voltage.. Hope there's some one can help me..
 

There are some errors in the diagram you have posted. I was making minor modifications, but that’s not for sure the ideal circuit you need. You may use dedicated drivers/optocouplers for low side high current application
e.g. TC4451/TC4452. Also check here:
**broken link removed**
http://www.fairchildsemi.com/ds/FA/FAN7392.pdf

or may try to modify the circuit by the suggestions available here:

http://m.controleng.com/index.php?id=2819&tx_ttnews[tt_news]=3426&cHash=a7528b4605
http://www.dataweek.co.za/news.aspx?pklnewsid=21190
http://www.ixysrf.com/pdf/switch_mode/appnotes/5mosfet_driver_theory_and_applications.pdf
http://www.ixys.com/documents/appnotes/ixan0009.pdf
**broken link removed**
 

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thanks for the reply mister_rf. I try the circuit you modify and its still give the same result. i will try the link you give. am i using the correct igbt? thanks for the links.

---------- Post added at 11:29 ---------- Previous post was at 10:56 ----------

in your schematic the 2n3906 transistor, did you mean i should change to other transistor?
 

I will try my best to understand all the datasheet. Thanks for helping. :)
 

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