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Registered Member #1389
Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346
Well, I finished up the SSTC that Arcstarter pointed out, and i got a 4mm flame with 30V @750 mA. I do not know the Fres of this secondary, as I just pulled it out of my junk from when I was starting coiling, though I would guess the Fres is somewhere around 400kHz. I'm working on optimizing it, and I may try putting more voltage into it when I get an appropriate supply. Also, I used 1N4004s, but only because that is what I had. I'll make sure to find something faster soon.
Update: Now drawing 1A @ 30V, with a small 6mm double flame. Primary is 13 turns with a 2 turn feedback.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Firefox wrote ...
Well, I finished up the SSTC that Arcstarter pointed out, and i got a 4mm flame with 30V @750 mA. I do not know the Fres of this secondary, as I just pulled it out of my junk from when I was starting coiling, though I would guess the Fres is somewhere around 400kHz. I'm working on optimizing it, and I may try putting more voltage into it when I get an appropriate supply. Also, I used 1N4004s, but only because that is what I had. I'll make sure to find something faster soon.
Update: Now drawing 1A @ 30V, with a small 6mm double flame. Primary is 13 turns with a 2 turn feedback.
Haha, never thought anyone would try it :P. Two turn feedback sounds kinda low, at 30 volts in you should have something like half of your primary turns.
With some uf4007's, maybe performance would increase? 1n4007's aren't even used in ZVS even though they only oscillate at a few 10's of khz, so in a sstc with a few 100's of khz, i am sure they are not working properly.
But believe me, i know what you mean, i didn't have fast diodes so i used the 1n series too :P. Maybe add a topload to reduce frequency, so that HOT does not have to switch so fast? That would also increase power consumption, which could be a good thing. Mess with coupling and primary and secondary turns, you know, all the normal stuff.
The maker used 80 volts input, so you can use much higher voltage! If you have a good ac transformer you can use some big lytics and good highish current diodes for a doubler, or even tripler. I have seen someone use a rewound MOT and some huge caps and the diodes out of a bridge rectifier and made a doubler powering his ZVS.
I have also used this circuit to power a flyback transformer, it worked out pretty good. The sparks were much larger with 12 volts in than with a 555 circuit with 12 volts.
Registered Member #1389
Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346
Pop goes the weasel. I guess that's what happens when a BJT starts to fail and you pass 22A through a 16A transistor. The flames from the SSTC have grown to about 8mm by putting a topload on (two bottoms of aluminum cans stuck together) and then putting a tiny TC secondary on top of the original secondary.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
And still only 30 watts :). With such high voltage transistors, i am sure 80 volts would be easy to get, but that is if you have a scope to try to eliminate parasitic oscillations. How did the poor HOT fail? Mine were only 8 amps and 9 amps or something, but 1200 volts.
Oh, and since you were looking to make something with your box of 'junk', just get a few atx psu's, and make a sstc. Depending on the oscillator IC used, you can use them for simple sstc's. I know that Richie Burnett made a sstc with tl494 and some other cheap sounding stuff, and got great sparks. You could just take his schematic and simplify it. For a crude example, make the oscillator oscillate(was this not obvious?) at some frequency close to your coil, make it adjustable with potentiometer and use a ucc37322 or totem pole transistor pair running a mosfet. Find some capacitors from some of the circuit boards and make it class e. I have done similar with a 555 and nothing to amplify 555 output and hooked straight to a mosfet, and results were pretty good. At 12 volts it would pull something like .8amps, and the spark would be very hot. My small laptop power supplies in series for 44 volts pulled only .4 amps, but this is because they were switch mode, and not smoothed. I am sure you could get pretty nice sparks with tuning or primary and shunt cap, and get it to pull a few amps at plenty of voltage.
And tl494 seems better than 555 at sstc driving, and they would be easier to find from circuit boards than 555's.
Registered Member #1389
Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346
Oh, sorry for the misleading post, Arcstarter. I popped a transistor in my Royer oscilator, which ended up shorting out my supply then popping. Not too spectacular, just dead.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Firefox wrote ...
Oh, sorry for the misleading post, Arcstarter. I popped a transistor in my Royer oscilator, which ended up shorting out my supply then popping. Not too spectacular, just dead.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
TV HOTs are hard to apply because of their lousy current gain, usually something like 5. They're probably best used in that self-exciting oscillator circuit (as seen in low energy lamps and some older ATX PS) where the base drive comes from the output current via a small CT. Other members know a lot more about this circuit than I do.
Or you could boil them up with jalapenos to make extra HOT chilli sauce. :D
Registered Member #1389
Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346
Just did some more measurement with my coil, and I now have more exact figures. When I stated voltage I forgot to take into account rectifier drop, which is 5V. So I am getting double 7mm flames with 23V input. It draws 1A.
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Something to Do with All Those Extra HOTs
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