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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Hi all, I think I had enough flyback arcs for now, it's time to move to the next level of HV projects
Because many people had success with Steve Ward' Mini SSTC, I'm going to use it to build my first SSTC.
Now for some questions: I have a leftover secondary winding from my unsuccessful sgtc, which has a diameter of 85mm and 205mm winding length. There are some 800 turns on it. Will it work for the SSTC?
Can I replace the UCC37322 and 37321 with TC4422 and 4421?
Since I'll be running from 230V mains, I'm going to use IRFP460's. The only modification I have to do is double the primary turns, right?
Will it also work with half wave rectified mains?
And finally, what are the requirements for the antenna, how far can it be from secondary to work properly? Will it lock to resonance even with low testing voltages to the bridge (30V)? Can I use schottky clamp diodes instead of germanium ones?
Registered Member #514
Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
Whether the resonator will work or not depends on it's resonant frequency. If it's in the 100's of kHz it should work. IRFP460's seem to work well enough at these frequencies. My bigger SSTC is runs at ca. 260kHz.
For 230V mains I used about 10 turn primary and halfwave rectified input.
The antenna feedback seemed to work best when the antenna was some 40cm from the secondary. Though it's not very critical.
Registered Member #180
Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187
I built that circuit and it worked great, but about the diodes (on the antenna), I found that it didn't work when I substituted the 1N60 diodes for 1N4148 diodes it didn't want to resonate (that is without the 555 sending the start up signal). However when I added the 555 everything worked fine even with 1N4148's.
Registered Member #514
Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
Should work fine. I believe the TC chips are lower power drivers than the UCC, though. They might run hot. If your operating frequency isn't too high and you use FETs that don't have a large gate C, they should work.
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
I was only able to keep the antenna 8in from the breakout point, only problem was when I added a larger toroid the antenna was arcing towards the torroid, thats when I decided to have a current transformer instead of an antenna.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Uzzors wrote ...
Use a transistor to pull the signal down, at the signal input.
I had the same idea but then one output will be low and the other high.. this might but also might not damage the fets and/or gate drivers, I don't know..
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It's time for an SSTC
