This is a very interesting idea, I didn't know you could just parallel the
tank capacitor and primary like that.
From what I understood the thyratron is working only as an interrupter.
Excuse my ignorance, but wouldn't that make it possible to make a much
simpler DRSSTC that uses a single IGBT/MOSFET in place of that thyratron?
If it works that'd avoid most of the hassle in setting up/building a
DRSSTC, and would still have the sound modulation and "traditional"
streamers.
On Mon, Sep 29, 2014 at 10:13 AM, William Howard <snakeprior@xxxxxxxxx>
wrote:
> Dear Group,
> I was dredging through the list archives and found mention of SCRs being
> successfully used by a man in a magnifier years ago.
>
> I found his website in the archives but it only has two pages:
>
> https://web.archive.org/web/20010519065013/http://home.hiwaay.net/~eburwell/
>
> I am continuing my work with thyratron pumped tesla coils and had the idea
> of using an inductor to limit current into the parallel LC network (to
> reduce stresses on the thyratron and pulse cap). It was good to see he had
> already used the idea years ago to limit the current through the SCR.
>
> I know the conduction time and recovery is longer for a SCR than a H2
> thyratron but seems as they are not shuffling energy between the inductor
> and capacitor in the tank circuit it shouldn't matter. There would just be
> a variable pulse rate at which the SCR discharges a capacitor into the
> parallel tuned LC network. I would be looking at 200 to 2000 pps.
>
> Here is a schematic of my existing thyratron tesla coil, an SCR just need
> be substituted:
>
> http://russianpoweredvttc.blogspot.com.au/2014/09/thyratron-tesla-coil-plans-theory-and.html?m=1
>
> A saturable reactor would need to be added to limit current through the
> SCR.
>
> I find this idea attractive because SSTC are too difficult for me to build
> and SCRs are pretty cheap.
>
> It would be a very simple thing to test. As a layman I have to ask is there
> any flaws to this idea?
>
> Cheers!
> -Wil
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