Very simple SSTC
Sparrow338, Mon Jun 25 2007, 01:53AMHere's a really simple SSTC design that I found at this site: http://user.web-gear.com/andreas-kilchenmann/sstc.html It looks a lot (almost exactially) like the 555 driven flyback driver circuit but this one is suppose to be able to run a air cored transformer. It seems to be a pretty wimpy circuit in the spark out put area, but it's still pretty cool since you could easily throw this circuit together in a couple of minutes if you were board. Just thought some of you might want to see it. When I get back from vacation i'll try it out.
P.S. Sites in German (i think) but it isn't hard to figuar out what he/she is trying to say.
Re: Very simple SSTC
..., Mon Jun 25 2007, 02:02AM
The very (very) early sstc's were based on a simple fixed frequency drive (provided by something along the lines of a 555) feeding a fet into the primary, but then we ran into the problem that you if you get near it it detunes, which reduces spark output, and has a tendency to blow up fets. Also, when you just drive the primary with a single fet like that you get nasty spikes whenever the fets opens/closes, so you have to use a very high voltage fet (for a given input voltage), which will have a very high Ron, is expensive, etc. To solve the tuning problem we switched over to antenna feedback, then pll, etc. To solve the voltage spike problem we added snubbers, (and a few our most talented people tried for class E operation), or switched to a half/fullbridge.
But if all you want is a little plasma (you could probably get an inch or 2 with relative ease) it could be the way to go.\
BTW, that spark pic at the bottom is amazing!
..., Mon Jun 25 2007, 02:02AM
The very (very) early sstc's were based on a simple fixed frequency drive (provided by something along the lines of a 555) feeding a fet into the primary, but then we ran into the problem that you if you get near it it detunes, which reduces spark output, and has a tendency to blow up fets. Also, when you just drive the primary with a single fet like that you get nasty spikes whenever the fets opens/closes, so you have to use a very high voltage fet (for a given input voltage), which will have a very high Ron, is expensive, etc. To solve the tuning problem we switched over to antenna feedback, then pll, etc. To solve the voltage spike problem we added snubbers, (and a few our most talented people tried for class E operation), or switched to a half/fullbridge.
But if all you want is a little plasma (you could probably get an inch or 2 with relative ease) it could be the way to go.\
BTW, that spark pic at the bottom is amazing!
Re: Very simple SSTC
Part Scavenger, Mon Jun 25 2007, 02:50AM
My first SSTC consisted of a 555 driven mosfet. I'd get it going, then touch the gate of the mostfet in close proximity to the coil, and *shazamm!* instant feedback coil. It ran about 1.2Mhz and about 60 seconds... LOL.
Part Scavenger, Mon Jun 25 2007, 02:50AM
My first SSTC consisted of a 555 driven mosfet. I'd get it going, then touch the gate of the mostfet in close proximity to the coil, and *shazamm!* instant feedback coil. It ran about 1.2Mhz and about 60 seconds... LOL.
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