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Registered Member #4762
Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93
Linas wrote ...
zrg wrote ...
why driver electronics intentionally have blur added ? what you don't want us to see ? (top right corner)
Well, you know, Tesla coils are a bit of economical bubble here in Russia nowadays, therefore a lot of people are hunting for a cheap and reliable SSTC/DRSSTC schematics. Our group managed to develop a really stable and well-performing one, and there are approved cases of even blurred and low-quality photos of our schematics being thoroughly examined by some interested in that guys . Sounds paranoid, but I'd prefer not to publish anything related to that driver. And this photo of the box was the only one available on my memory card, so I decided just to blur it finely. Just in case
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
zrg wrote ...
Well, you know, Tesla coils are a bit of economical bubble here in Russia nowadays, therefore a lot of people are hunting for a cheap and reliable SSTC/DRSSTC schematics. Our group managed to develop a really stable and well-performing one, and there are approved cases of even blurred and low-quality photos of our schematics being thoroughly examined by some interested in that guys . Sounds paranoid, but I'd prefer not to publish anything related to that driver. And this photo of the box was the only one available on my memory card, so I decided just to blur it finely. Just in case
Any good new features, like phase lead, or you some have managed to get out of closed loop and still make good feedback ? Since in University we developed technique that at start up scans for frequency, where is highest power level, and use that for 50% PWM signal. Now if we use LC circuit, should we care about current feedback , if we just can measure at each startup Fo, and use HRPWM to generate switching frequency, and at this point, iGBT will always work in ZCS ?
I have idea simply to use 100W 50V transformer to scan coil frequency range, and after that switch high voltage for normal operation (and short CT with relay for extra protection), what does members think about that ? Since we don't have any IGBT fail at this time, but coil was used only few times
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
The resonant frequency falls over the course of the burst as the streamer grows. It also changes suddenly when a ground strike connects. You have to track these changes in real time, so measuring the frequency once at startup isn't good enough.
That looks great! I always wanted to make a spirally toroid like the one you made the first time I saw some field diagrams of tokamaks ( ) but never had the resources (or need really) to build one. I'm glad you pulled it off so nicely Looking forward to your public performance!
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
zrg wrote ...
Got the coil outside and running. Tomorrow's first big public perfomance. Keep an eye on updates.
So, can you give any feature set of your DRSSTC controller ?
For toroid, i have very cool idea what i am going to try out. Where is solid extruded polystyrene foam, that is very strong, i will use it to create shell that is impact resistance ( or will need resurfacing after big impact) i will buy 5cm extruded foam sheets, and with CNC router create layers, after gluing and lot of aluminum tape, it should be perfect
Registered Member #4762
Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93
Second day over. The coil performed nice, maximum registered spark length was around 6 meters. However we didn't have any chance to run it at night, so I'm unable to provide any really spectacular photos or video. Primary was detuned about 10-15% from secondary resonance, which gave impressive sparks on 200-300 Hz and at the same time failed to play high MIDI notes. Looks like big coils need primary slider motor, like the one on Thumper DRSSTC
OCD was on 3600A, maybe 3800. The hottest parts are wires between primary and MMC or bridge (they're 50 mm^2, and that is surely not enough). Actual power consumption unknown, but I think it must be around 25-30 kW.
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Modular-based large DRSSTC
. Sounds paranoid, but I'd prefer not to publish anything related to that driver. And this photo of the box was the only one available on my memory card, so I decided just to blur it finely. Just in case 
Looking forward to your public performance!
