 how to improve realiability of a DRSSTC
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Danielle
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Sun Oct 28 2007, 12:14AM
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Registered Member #632
Joined: Mon Apr 09 2007, 01:09AM
Location:
Posts: 267
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I built another DRSSTC this one almost identical to Steav's DRSSTC 3 except I am using 2 30N60s instead of 40N60s and this one I am donating to my school for demmos. The coil works well I was able to make over 20" spray and play music. the teachers were very impressed although then the IGBTs blew after 12min playing music and I was raising the PW. I checked and the IGBTs were still cold!
My question is that I need to make it so the IGBTs caint fail as the control bord will limit anything that may cause a faluar coming from the interrupter how would I do this or what alse can I do to improve it they are paying for the coil if it works well.
The OCD just wont cut it as it limits properly with a standard interrupter but not with music if thats all I need to do then ok I will tell them it caint play music.
I replaced the IGBTs and ran it for 20 min with 25" arcs coming from music and then 1 IGBT failed I need this to be stable any ideas on what I can do to prevent these faluars?
Thanks for the help.
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101111
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Registered Member #575
Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263
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Try to use shielding on your circuitry and CT. Don't push the current protection too high and use good filtering caps.
Now I am a tc noob but I am very sure that can help.
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Dr. H.
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Registered Member #931
Joined: Mon Jul 30 2007, 05:25PM
Location: Bulgaria
Posts: 486
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When you have it running for so long, and then the IGBT fail i think this is due to high voltage spikes. I had a similar problem with my wealder. After 10-15 min of work the IGBTs died. So i added TVSs and i haven't had any problems since then.
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