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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Steve Ward wrote ...
Unless you really go through the thermal transient modeling (which unfortunately the 60N60 datasheet is screwed up) and prove that the delta Temp on the die is quite safe, then you guys are mostly just pulling numbers out of your ass.
Of course we are pulling numbers out of our ass! This is the Internet after all
Richie and I have always recommended going easy on the peak current, too. When I first built my Mjollnir coil, Steve laughed at me because I put four miniblocks in it and ran them at only 450A. But 5 years later I'm still using the original set of IGBTs. (Touch wood.)
This approach to reliability is summed up by a TV program I once saw on tuning cars. "Don't waste money on tuning, just stick a bigger engine in it."
Steve and I used to have different methods for designing DRSSTCs, but his make somewhat bigger sparks than mine, and I like his method of tuning large coils that excites both poles at once for fast energy transfer. So nowadays I just agree with him.
Registered Member #2481
Joined: Mon Nov 23 2009, 03:07PM
Location: ITALY
Posts: 134
Steve Ward wrote ...
Its sort of a pre-requisite to really understanding the subtleties of DRSSTCs, they can really be quite complex if you want them to be. Or, just tune for maximum smoke if you dont want to be bothered with all the thinking.
I also recommend Antonio's DRSSTCD program, just be mindful that with any simulation: garbage in = garbage out. It takes a bit of interpretation and working with a real system to know whether or not the results are realistic when you have a spark shooting off the top of your coil (which is, afterall the hardest part of all of this analysis).
Regarding this item, I'm performing a lot of PSpice simulation in order to try to better understand DRSSTC behavior... The point is that one should have a detailed electrical equivalent model of the streamers otherwise simulations are quite meaningless... The main difficulty is that streamer load is something "dinamic", very complicated to model... At the moment, as streamer load, I am using a 220k resistor with a series capacitor that increases during streamer growth.
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DRSSTC: choosing the "right" surge impedance
