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Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
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Well, as i wait for my DRSSTC parts, I figured I would kick up my SSTC. It has been blowing fets, and i found its because the fullbridge, had a 0.68uF capacitor. in series with the primary. Possibly, pulled into resonance randomly, and popped the system. So now I have a much larger snubber grade 1.2uF capacitor.
Voltage Triplers. Currently my 24" x 4.5" tesla coil is running on a voltage tripler consisting of 3 capacitors. 450V, 1200uF. These are 3x5 inches and take a hell of a lot of space. People in the past commented "Those capacitors are WAY too big for your system" so, I have questions about that.
Why I use large capacitors -- It allows me to do burst mode, and kick out much larger streamers. It gives the capacitors time to charge, and time to discharge their spark. When running in a more faster interuption speed, the sparks are smaller. They are a lot bigger when doing burst mode with giant capacitors. This being said, is it possible when i use big capacitors like these, that the huge inrush of current during a burst is causing huge spikes in the system killing mosfets out of random? I had a full power run long ago for 6 minutes, and it randomly popped. I figured now, maybe it randomly went to resonance with that 0.68uF capacitor...maybe the burst mode with those giant capacitors.
They take up a lot of space, and i fear going too small, i loose my ability to get big streamers. So, I'm asking you guys, thoughts. What are bad things about using large capacitors, and what are advantages with using small ones. I have no idea what way to go, but i do enjoy burst mode not ONLY because i get big sparks, but at night, its just fun to get that flash-frame in your head, to see a single spark. I'm just trying to figure what has killed my system twice now. It died once during music modulation. over 20 minutes of solid playing, and it just randomly, when i was striking the C key on the piano like 30 times in a row fast, Exploded half the bridge. After reviewing, though, i think the secondary wire was on the heatsink, and it arced over during those large bursts when i hit the C key.
Also, during all these runs, I dont ever fan my heatsinks, they have never got above 80F. These mosfets do really good, and run a TOOOOOOON colder than my IRFP460s, as they are rated like 500V 48A, with 500W ratings.
Please give any ideas or thoughts, Thanks. Im remaking the whole system, board and all, might as well get my power supply correct.
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SSTC and Voltage Tripler Capacitors
