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Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
I had an idea to simplify a SSTC driver circuit a bit by avoiding the Schmitt-trigger stages and use only two non-inverting driver IC's. I wanted to do the inverting part on the feedback CT itself, by using two out-of phase windings on it.
Clamped CT output is already perfect squarewave and I don't see what else it needs.
The problem is, when I clamp one winding to ground to pevent it from going negative, I'l also clamp the output of a second winding.
Who can think of a neatest solution for this? Should I just use a second CT? Or some kind of burden on the output?
I also imagined that series resistor on both sides would drop only clamp voltage and thus could be larger value. It's voltage drop would allow other side to rise.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
You might want to try centertapping the CT. Or clamping both ends of the secondary winding. It would be cool if a single CT could act as the GDT aswell.
Registered Member #514
Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
Excuse my ignorance, but why do you want to use two non-inverting drivers? Why can't you just use an inverting and a non-inverting driver, tie the inputs together and feed them both of the same CT winding? Or am I missing something here...
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
First, non-inverting have proven to have somewhat smaller delay than inverting ones.
And more importantly, I want to incorporate neat safety feature into the circuit; coil can't be turned on unless it receives a startup pulse; I won't be able to flip the switch on the coil and turn it on, I can only do that over remote/interrupter. If bridge loses power for any reason and feedback dies, the remote needs to be cycled again in order to restart.
The starting circuit will be nothing more than a resistor, cap and a de-Qing diode controlled by a small mosfet. The cap is slowly charged and then dumped into the driver input at start.
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2 output CT
