 testing the igbt shunt regulator
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IamSmooth
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Mon Dec 08 2008, 02:12AM
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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
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Posts: 1567
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I was testing the shunt regulator and it was doing well. The Rshunt is 8.3 ohms. I was increasing the voltage with a variac and did not exceed 100v. Where I have the IGBT on the schematic it is really 4 in parallel and can handle 600W.
Once I exceed about 60v the voltage would not increase as I increased the variac. I could see the ammeter needle oscillate around 7 or 8A. I turned the system off and tried it again. This time the CE path was completely open. I guess it is latched. I don't know if I fried the chips or if I have to do something to get it back to the normal state. Any help? What can I do to prevent this?
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HV Enthusiast
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Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
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Why are you using an IGBT for a linear application? Although it will work, they are generally poorly suited for linear applications and better for switching applications.
I would use a MOSFET.
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IamSmooth
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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
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I'm just experimenting right now. I have MOSFETs for the application, too.
That being said, is there any way to fix my problem with the IGBTs? How would I prevent this in the future?
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