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Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
While using Steve Conner's google search function, I came across a reference which said you can wire two DC flybacks in series, with a centre tap as a zero reference, and get an AC output.
I couldn't find a relevant schematic, though.
What I'm wondering is how would you go about connecting this setup to power a plasma globe, for example?
I've been puzzling over this for a couple of hours and can't work out how to do it.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
I read that thread earlier, Darkspeed.
I know I can get AC if I use a Tesla coil (I did that ten years ago when I built a HF supply for TIG welding, using the single transistor flyback circuit).
It doesn't mention anything about connecting two flybacks in series with a centre tap for AC, though.
Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
I think the idea is to put the two modern DC flybacks in parallel, ground to ground and HV to HV. And then drive them 180deg out of phase. Don't quote me on that tho.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Electraholic, what you describe is equivalent to a conventional rectified centre tapped transformer, and is also equivalent to driving just one rectified flyback at twice the frequency.
I can see how, if they are wired in series with a centre tap, the ground pin of the lower one is negative with respect to the centre tap, and the output of the upper one is positive with respect to the flyback, but I can't really see how to make use of this.
Maybe the original reference I read is incorrect, but I thought it was worth asking about, just in case.
EDIT: Maybe if you connect a couple of capacitors, one across each flyback, and fire them alternately? That's the best idea I can come up with so far.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
It was just a post in an early thread on plasma globes. All it said was that it is possible. I'll look for it again, but it didn't give any more information than that. I just thought it was worth following up, just in case......
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Connecting DC flybacks in series with centre tap gives AC?
