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Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Dr. Kilovolt wrote ...
Very nice Is there any specific reason why you are tuning to the upper pole of the secondary?
Yeah there is. The secondary's F0 is in the 280KHz area this is to low for QCW operation, the sparks would branch and look a lot more like what your coil looks like. It would also be supper silly to make a secondary with a F0 at 350KHz because it would ether be really small or have very few turns. So I did a larger secondary and because the coupling is so high the upper pole is also very far away from the natural resonant freq making it a great choice for high frequency operation.
Richie's site explains this very well! Thanks again Richie! I was in the dark until I read that page.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hey goodchild, good work.
Actually, what stops you from ramping this up while you get some several meters worth of arcs? :O From what it looks to me all you need is more energy storage..
The peak power of your coil with 100A was like 30kW, while I had a bridge run 24kVA in CW - which means you could keep almost indefninte on times there...
I guess the only real danger is your ridiculously overcoupled primary flashing over I guess.
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Marko wrote ...
Hey goodchild, good work.
Actually, what stops you from ramping this up while you get some several meters worth of arcs? :O From what it looks to me all you need is more energy storage..
The peak power of your coil with 100A was like 30kW, while I had a bridge run 24kVA in CW - which means you could keep almost indefninte on times there...
I guess the only real danger is your ridiculously overcoupled primary flashing over I guess.
Marko
Yeah energy store is a big part of it. I currently have 10mF at 380VDC on the class D. The main thing that stops me from going to say like 30Kw is that bridge of 60N60 IGBTs. At 100A CW they would be in for a world of hurt event with water cooling. I run them pulsed right now so they will happily run at 100A with not to much trouble up to about 50% duty. Any higher than that and they tend to go boom....
Yeah the primary's high coupling is not to big of a problem, because if you are going CW and you still keep your ramps in there the peak top volts should still be low, you just get lots and lots of individual sparks that clump together into one big bush! So it can't go true CW but it can get dang close say 98%
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Kilovolt asked why operate at the upper pole. The reason I did this was initially an accident, but what i later realized was that there is a benefit to this. The main thing is that it reduces the stored energy in the system because the primary and secondary magnetic fields are cancelling each other out. This allows the use of a "large" resonator (4.5" x 9" seems awfully popular now) but still obtaining a high operating frequency which appears to be quite useful for spark propagation with lower top voltage.
I suspect you could likely use a smaller, higher F resonator and tune it for the lower pole if you wanted... and i havent tried this, maybe there is something to it.
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