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Registered Member #514
Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
So here's the deal: I finally built a "real" SSTC, nothing fancy, just a halfbridge of IRFP450's driven by the usual antenna feedback system. Power is fullwave rectified unfiltered 230V mains.
The coils resonant frequency is around 340kHz and I have a start-up oscillator running at 160kHz. The coil works just great. I get hot streamers about 20cm in lengh, and I'm drawing about 3A from mains. Still room for improvement, though
Now the problem: I want to use an interrupter, so I can get other effects than just the CW brush discharge. I made a controller that goes from 1 to 200Hz and 0 to 100% duty, but when I have it hooked up on the UCC3732* chips enable pins, the coil just won't start to oscillate! I scoped the gates with the interrupter on (with no power on the bridge, of course) and the drive signal is fine. The damn thing won't even oscillate when I have the interrupter turned to 100% duty!
If I poke the break out point with a discharge stick I get a small spark, but that's probably cause the coil is being driven by the start up osc.
Registered Member #505
Joined: Sun Nov 19 2006, 06:42PM
Location: Yorkshire!
Posts: 329
Perhaps changing your start up oscillator frequency nearer to the fres of the coil would help. Then you will get a more reliable startup when the interrupter turns on.
I can also recommend Steve's PLL Circuit - I used this in my small SSTC and interrupter with no problems. It has the advantage of it's own oscilator in circuit so removing the need for an external one.
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SSTC Interrupter problems
