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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I don't quite get this - what is the advantage of a DRSSTC system, when you can use a turn or two of copper strip as the primary and get the same peak currents with a classic SSTC driver?
Registered Member #1623
Joined: Tue Aug 05 2008, 03:31PM
Location: The Netherlands
Posts: 39
I'm not an expert on this but when you use a DRSSTC you can have a primary coil of multipy windings which increase coupling to the secondary and thus better energy transfer. With an SSTC it isn't possible to achieve this because the impendance from the coil will limit the current no matter how thick you make your wire.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Lethal Shot wrote ...
I'm not an expert on this but when you use a DRSSTC you can have a primary coil of multipy windings which increase coupling to the secondary and thus better energy transfer.
Well if you make the primary say from a copper sheet of the same width as the DRSSTC primary (if you need more turns, wind them layered), the coupling should be about the same, or not?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
DRSSTC has three advantages:
1: Tuned primary acts as a L-match, giving another stage of impedance step-up between inverter and sparks. This allows heavier inverter loading and bigger sparks, while still having coupling loose enough to avoid flashovers. You'd probably need less than one turn to achieve the same with a non-resonant primary.
2: Tuned primary has no magnetizing current, so the devices can switch at zero current. This allows you to push IGBTs beyond their datasheet current and frequency limits (typically they can carry more current than they can switch) Result, even bigger sparks!
3: Tuned primary can tune out the stray inductance of your layout too! With a single-turn untuned primary, the stray inductance might become a significant limiting factor. Result, even more current and bigger sparks still...
Registered Member #2489
Joined: Mon Nov 30 2009, 06:23PM
Location: Oakland, CA USA
Posts: 17
From my recent simulations I seem to be concluding that the DR scheme is best, with feedback, if any, from the primary rather than the secondary. See Comments on that?...
Also, a question: What's the best tuning for the primary? Spot-on to the secondary's nominal Fr, tuned high (by how much?) or tuned low?
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DRSSTC question
