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4hv.org :: Forums :: Tesla Coils
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Plasma evolution at 240fps

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Goodchild
Fri Apr 26 2013, 04:49PM
Goodchild Registered Member #2292 Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Nice! Love the decay at the end as the spark fades out.

I have two question:
What spark length are you pushing on this thing?

Also is this using your new fancy water block?
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Steve Ward
Sat Apr 27 2013, 09:12AM
Steve Ward Registered Member #146 Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
What spark length are you pushing on this thing?

The length to the ceiling is 56".

And ironically i measure the top voltage to be about 56kV after my recent probe-recalibration.

1 kV per inch :)

You couldnt have guessed more right smile.

Also is this using your new fancy water block?

You mean this one?

http://www.flickr.com/photos/kickermagnet/8600938087/in/photostream

Not yet, but im finally installing it for tests. Im pretty happy with the performance of a similar water block i made which was able to do 150W dissipation on a TO-247 with a kapton isolator. This test was also with a smaller mosfet which had more internal thermal resistance, so the IGBTs that this project uses would be able to do 200W dissipation (die temp around 110C). I calculate that i need each IGBT to do 50W worst case which should be pretty easy if i can keep my coolant temp to 60C or less. I plan on reusing this bridge design for some other projects too, so i hope my math is right!
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Intra
Sat Apr 27 2013, 03:15PM
Intra Registered Member #2694 Joined: Mon Feb 22 2010, 11:52PM
Location: Russia, Volgograd (Stalingrad).
Posts: 97
It's sad.. Anyway it is awesome. =)
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