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Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
Jmartis you might want to read up on how a flyback transformer normally operates in its intended application in the line-output stage of a television receiver.
This is a single ended quasi-resonant converter used to generate HV and is based on technology that is as old as the hills.
I've attached the basic schematic and waveforms
Note that it is only resonant *during* the "flyback" times. This discontinuous resonance achieves soft switching but prevents voltages and currents ringing up to dangerously high values due to many cycles of resonant rise.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
GeordieBoy, I know how flybacks are driven in TVs. However, using this method you can not generate very good arcs, the transistor gets hot, and you only can use 1/2 the possible power that the core offers.
I have been running flyback xfmrs from halfbridge drivers for long time, it's just that with direct drive there is too high reactive current and the transistors dont like this, so I wanted some improvement/way to get more power out without overheating the transistors.
So the question is still the same: will the LCLR driver work for a flyback xfmr? (with "flyback" being a bit misleading as of course it is not longer driven as in its original circuit).
Registered Member #187
Joined: Thu Feb 16 2006, 02:54PM
Location: Central Ohio
Posts: 140
Marko wrote ... I referred to this note several times but I apparently didn't get much attention.
It's the circuit at page 5.
I know I'm stepping in kinda late here, but I wanted to point out that I think one of those circuits has an error. I can't remember which one, but I know it's not the first schematic in that bulletin. I know that one of the feedback windings has the "dot" on the wrong end, causing the circuit to fail to oscillate if connected exactly as drawn. Aside from that, that app note is a decent one. There is a better one I posted a long time ago, I'll dig it up if you want.
Edit: I just reviewed that circuit and I noticed that the configuration in figure 2 (half-bridge) does not agree with the configuration in figure 5, which is the one you are referring to.
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ZCS resonant driver idea for (HV) ferrite power transformers
