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4hv.org :: Forums :: Tesla Coils
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First SSTC

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ZakWolf
Thu Dec 16 2010, 03:34PM Print
ZakWolf Registered Member #3114 Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
I am going to make an sstc that is powered by a ZVS flyback driver (not sgtc).I have noticed that sstc seem to be smaller then sgtc why is that?

what would be a good height and diameter for a sstc.

could I also audio modulate the ZVS driver?

Thanks
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Gregory
Thu Dec 16 2010, 03:41PM
Gregory Registered Member #2922 Joined: Sun Jun 13 2010, 12:08AM
Location:
Posts: 226
zvs driver? i don't know if this is possible, zvs flyback driver is auto-tuned to the primary ressonance frequency and for a SSTC you need the primary running at the secondary frequency.

sstc need to be small because the low power level in the primary that isn't tuned.

the best ratio is D:H = 1:3
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ZakWolf
Fri Dec 17 2010, 05:27AM
ZakWolf Registered Member #3114 Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
I tried it out and it didn't work very well i dont have a low enough tank cap for the zvs so i was way off frequency

Some problems:

I killed 2 irfp250 mosfets they got hot supper hot i have a 5+5 for the primary
it also drew a ton of current
what am i doing wrong
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william L
Fri Dec 17 2010, 05:53AM
william L Registered Member #3093 Joined: Mon Aug 09 2010, 11:40PM
Location:
Posts: 68
Well, you can excite a tesla resonator off a zvs driver, but you would have to tune the primary side tho the frez of the secondary. If the circuit is killing fet's, test it out on a flyback to see if it is functional.
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Weston
Fri Dec 17 2010, 06:59AM
Weston Registered Member #1316 Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365
If you remove the primary tank cap and use tight coupling between the primary and the secondary you should be able to get the driver to run at the frequency of the secondary. (I have done it before) It is prone to falling out of oscillation though when you draw a arc.

I would recommend putting a big one ohm or so resistor in line with the supply to limit the current for when it falls out of oscillation and one of the transistors shorts out the supply.
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ScotchTapeLord
Fri Dec 17 2010, 07:16AM
ScotchTapeLord Registered Member #1875 Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
The actual transformer part of sstcs are smaller than those of sgtcs because solid state switches cannot handle the amount of power that spark gaps can. The large size isn't used because it can't be utilized fully with silicon... unless you make a DRSSTC with some kind of IGBT bank...
The coil driver of the sstc is smaller because you don't need an iron core transformer for the full wattage of the coil like in sgtc... but that's obvious.

The ZVS I think was originally made for driving SSTCs but I don't see the advantages over a half-bridge.

ZVS is limited in terms of wattage from what I understand, unlike class-D stuff. Not to mention, until I figure out how exactly the heck it works, I claim that ZVS runs off voodoo principles.

With secondary feedback, you can make a half-bridge using about the same component count as the ZVS. But if you insist on ZVS, try adding more windings and perhaps getting a larger inductor core. It probably saturated due to the lower impedance nature of the primary and made the voodoo backfire.
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Gregory
Sun Dec 19 2010, 03:43AM
Gregory Registered Member #2922 Joined: Sun Jun 13 2010, 12:08AM
Location:
Posts: 226
Weston can be right. If you use a high coupling the two ressonant circuits can ressonate at another frequency equal to the primary frequency (this is rare) and the zcs can read the voltages picks of the secondary and tune the circuit
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