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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Here's the beef... (one of Steve Ward's new DRSSTCs that I found on Flickr) (my DRSSTC a couple of years back) (voltages, currents and bang energy measured from it with a DSO)
and many others...
If you look back through the forum archives, you'll see a lot of discussion about DRSSTCs, how they work and how to design them. You can also see the HVWiki:
Registered Member #2489
Joined: Mon Nov 30 2009, 06:23PM
Location: Oakland, CA USA
Posts: 17
Well, it took me until 6 a.m. or so PST to understand that I'm not saved from the pesky resonant primary. It's the internal impedance of the whole thing that's the key, right? With a non-resonant primary, the impedance looking back from the the top electrode, so to speak, is much larger & so the power going into the spark is less. The waveform shows that. I wouldn't have thought it, considering the mere value of 0.2 for the coupling coefficient. Back to the dwg bd...
Registered Member #2489
Joined: Mon Nov 30 2009, 06:23PM
Location: Oakland, CA USA
Posts: 17
More on this topic: I've now simulated primary resonance while taking feedback from the secondary & include herewith 3 dwgs--the schematic & 2 waveform dwgs. (I also corrected the primary elements: 56 uH for the coil and 20 nF for the capacitor, not 40 & 30.)
Observations: 1. The mains draw during the spark event is at the same rate using primary feedback but it diminishes when using secondary feedback. So...less energy goes into the spark with secondary feedback?
2. The peak voltage output reached @ 200 us is substantially greater with a non-resonant primary. So...the rate of rise is greater. So...more charge could be crammed onto the electrode before breakout--if the rate of rise were high enough. But...less energy would be pushed into the spark while sparking, due to the higher output impedance of the coil.
3. The peak resonant-primary voltages are substantially higher when using secondary feedback. Why, I wonder?
4. Looks as if a resonant primary with primary feedback is the way to go, as people have been saying all along.
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DRSS vs. SRSS
