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Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Nice. Can we see some more pics of what is inside the box? Ive always wanted to make my DRSSTCs like that (just a box that contains all the "non-tesla coil" parts). Im curious to see how its laid out inside (even if its just a prototype!).
Registered Member #795
Joined: Mon May 21 2007, 06:04PM
Location: Bocholt, Germany
Posts: 35
Hm... It is one huge mess inside the box!!! =)
And... I don't think you like it, everything just thrown in... So, I mean a REAL MESS ;)
So I do NOT want to post a picture... But if you promise not to laugh.... Okaaaay.
Like you said it IS a prototype... It is a wonder that it works.. No, not a wonder, I planned it all very good LOL
At the top you can see rectefyer, charging and discharging resistors for the main capacitor, transformer for electronics, and receiver (at the left side) for the optical cable. The red thing is the primary cap, the box at the bottom left is the control-unit. The big blue things are the main caps, directly mounted on the IGBTs. And the other smaller blue caps are for reducing the voltage spikes at the IGBS... Notice that the heatsink of the IGBTs is not active cooled, and that there is no way for fresh air to come in. But it does not heat up (just hand-warm), after some minutes of operation...
I will post better pictures when all the stuff is rebuild!
Have fun, and don't make fun of the box! It's got real power!!! ;)
Registered Member #795
Joined: Mon May 21 2007, 06:04PM
Location: Bocholt, Germany
Posts: 35
Thank you Steve for the link to the thread!
Interesting to read, and I think much to learn from that coil!
Another thing: Totay I fired up my coil with a changed settings of the interrupter and the overcurrent protection. It worked well indeed! Sparks were longer than before, but then I got a hit into one cable connected to the primary coil, and everything was quiet after that! *shocked*
As I know now, the (most) electronic components are okay, just one rectefying diode was broken (not visible) from (I think) too high voltage from the hit into the primary. That caused to blew all fuses from that line... The one in the box, the one directly before the 3X32A plug, AND the main melting fuse... =( Remember that I build this coil in a university... One of the three powerlines of an building tract are dead now... Hope that no servers or importend things was powered with that!! =)
Hope that someone can fix this tomorow!!!!!
So what I learned is: Have allways a good strike-protection!
By the way that moment the strike took place is on the photo attached. Nice that we got that!!!
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Yikes, i might expect the IGBTs to be gone too. It seems odd for an input rectifier to fail from an arc like that, they are usually stupidly robust (diodes in general are this way).
Do you have any AC bypass cap from your H-bridge to ground? Maybe a .1uF cap from either bridge supply rail to your ground connection could be helpful for the differential mode voltage caused by primary strikes. Eventually i want to find a way to make the DRSSTC primary completely immune to streamers hitting it, but that wont happen for many months.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Awesome coils around here, and not getting enough attention.
Like you said it IS a prototype... It is a wonder that it works.. No, not a wonder, I planned it all very good LOL
At the top you can see rectefyer, charging and discharging resistors for the main capacitor, transformer for electronics, and receiver (at the left side) for the optical cable. The red thing is the primary cap, the box at the bottom left is the control-unit. The big blue things are the main caps, directly mounted on the IGBTs. And the other smaller blue caps are for reducing the voltage spikes at the IGBS... Notice that the heatsink of the IGBTs is not active cooled, and that there is no way for fresh air to come in. But it does not heat up (just hand-warm), after some minutes of operation...
I like the box... and I'd even say that it's more orderly than some Steve's coils (which work darn well);
Can you take some stiller closeup pics of it?
Nice. Can we see some more pics of what is inside the box? Ive always wanted to make my DRSSTCs like that (just a box that contains all the "non-tesla coil" parts). Im curious to see how its laid out inside (even if its just a prototype!).
Yep - I too like the idea of ''physics package'' I can toss in and out of the coil easily for repairs and transport.
I although prefer it to be open frame, just because it is easier to work on, ventilates better and shows off all the cool components...
So what I learned is: Have allways a good strike-protection!
By the way that moment the strike took place is on the photo attached. Nice that we got that!!!
I also found it difficult to properly shield the primary-tapping cables...
I had an idea, if you could find some of those flexible water hoses shielded with metal rings (like shower hoses), or more expensive, with wire braid.
like this:
I thought to pull the conducting cable all the way through the hose, making something like sturdy coax, make sure it's insulated, and ground one end of the hose.
I think that would look cool and much more secure than a bunch of strike rings.
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