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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
short answer ... high frequency ac is not suitable for a sgtc.
You could rectify the output and with an inductive ballast go for resonant charging but that would defeat the purpose of your ac flybacks.
I would consider a 'magnifier' type TC for which your ac flyback looks ideal, . find the open circuit resonance frequency of your secondary (I'm sure potential purchasers will be interrested in this parameter) . build a TC coil & topload to match this frequency, base drive it from your transformer secondary . drive the primary at this frequency with an 'interruptor'
I see the main use of your transformer as a source of high frequency high voltage power to drive a voltage multiplier, e.g. <= 15kV per stage as that's a common hv rating
Registered Member #8817
Joined: Mon Dec 17 2012, 05:16AM
Location: Australia
Posts: 110
Sulaiman wrote ...
short answer ... high frequency ac is not suitable for a sgtc.
You could rectify the output and with an inductive ballast go for resonant charging but that would defeat the purpose of your ac flybacks.
I would consider a 'magnifier' type TC for which your ac flyback looks ideal, . find the open circuit resonance frequency of your secondary (I'm sure potential purchasers will be interrested in this parameter) . build a TC coil & topload to match this frequency, base drive it from your transformer secondary . drive the primary at this frequency with an 'interruptor'
I see the main use of your transformer as a source of high frequency high voltage power to drive a voltage multiplier, e.g. <= 15kV per stage as that's a common hv rating
Why is high frequency AC not suitable? I see many flyback driven tesla coils on youtube...
yes that would defeat the very purpose of these transformers.
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
Those are all using DC flybacks.
In an AC-driven Tesla coil, the tank cap should charge and discharge at least once for every AC half-cycle. Any charge left in the capacitor when the supply voltage reverses will just lead to increased losses. At mains frequency, this is fine, as the break rate can easily be higher than the mains frequency. With a power supply operating at tens of kilohertz, this mode of operation is not really practical, there is very little energy in each cycle of the input voltage, so the bang energy would be tiny, and it would be very hard to make a spark gap that could quench at such a high rate.
A magnifier setup would be ideal, but then you couldn't use the ZVS module you're planning to, since they can't be interrupted or precisely frequency driven without painstakingly tuning the zvs. You'd need a half bridge and VCO to drive the AC flyback more easily. This mode also risks over voltage of the AC flyback secondary through resonant rise.
You'd have to rectify the output of the AC flyback to do the normal SGTC circuit. I'd probably use an old EHT diode vacuum tube for the job, but a microwave oven diode string would work too. Or use a DC flyback instead.
You could also make a CWSSTC out of it by driving the AC flyback at the secondary resonance of your TC and using a nonresonant primary. There would be an impedance mismatch but if you use a low impedance primary then it's no more harsh on the transformer than driving a large flaming arc. The tough part would be tuning the ZVS to the TC secondary resonance. This is the safest for the AC flyback though, and the least lossy method. I'd go this route myself.
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AC Flyback SGTC, calculating MMC capacitance?
