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Registered Member #4151
Joined: Thu Oct 20 2011, 09:13PM
Location:
Posts: 4
hi, I'm planing to build a SSTC and i want to know wich is the best topology of power FETs. I'm thinking the full bridge is the best but the push-pull can be a good idea too?
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hello,
forget about push-pull, and also perhaps best forget about mosfets if you want to push great power levels in CW.
I used HGTG30N60A4D IGBT's in a full bridge for some quite killer CW sparks.
I don't like the amount of punishment this puts onto the inverter though and I would like to switch to series resonant primary (basically DRSSTC, but with a lot higher impedance and CW operation! )
From other side if you want a smaller, high frequency SSTC go with a full bridge of mosfets.
In any case make sure to mount your devices well on individual heatsinks and positive pressure over die.
Registered Member #4151
Joined: Thu Oct 20 2011, 09:13PM
Location:
Posts: 4
Yes, it's my first SSTC, i made a SGTC and i love the sparks of that. I have the IRFP260N FETs and the secundary too, i'm planing to use a tl494 for the oscilator. i'm thinking to use 2kw in this coil.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi sir,
First you have to decide what kind of a SSTC you want. Do you want to run CW, fullwave/halfwave rectified input? Or you want an interrupted coil running from filtered input like Steve ward's mini sstc? Considerations are actually pretty different in these two cases. I definitely wouldn't use TL494 over feedback techniques to start with.
An interrupted coil takes advantage of interrupter pulse to start it, while this is troublesome in CW coils, and even more with unfiltered supply coils which need restarting with every mains pulse.
Solutions to this are either PLL or a starting oscillator weakly coupled to your feedback CT or antenna. The catch is, I don't even know about a single super-reliable design for such a coil. The best I know were Steve Conner's DWSSTC PLL circuit, Steve Ward's PLL circuit , or some of those old Steve Ward's direct feedback coils. None of them has overcurrent protection of any kind and I think all have some history of blown mosfets (which may or may be not related to the drivers).
From other side, if you're a total beginner, I think most people here would just recommend you to blatantly copy Steve Ward's mini SSTC which is indeed a good recipe for success. I'd probably add an overcurrent protection circuit to it anyway :)
Registered Member #4151
Joined: Thu Oct 20 2011, 09:13PM
Location:
Posts: 4
Thank you Marko for those explanations! I'm want a audio modulated tesla coil, but with a option to rum CW at full power! I'm thinking to ue tl494 because i successfully tested a audio modulated flyback driver and i will change de output transistor to push-pull to drive some FETs or transistors to drive de GDT.
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sstc topologies
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