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4hv.org :: Forums :: General Science and Electronics
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SCR "chopper" driver for mains xfmrs

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Dr. Dark Current
Tue Apr 01 2008, 09:49AM Print
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
What if you made a SRC/TRIAC "chopper" circuit which passes only the second half of every halfwave, and used that to drive a mains xfmr with doubled volts per turn? Would that work?


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...
Tue Apr 01 2008, 02:25PM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
If you only passed half of the waveform the transformer would only get pulses of DC and would probably soon satrate... If you put a dc block cap in series with it you might be able to get away with it, but there are better ways...
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Dr. Dark Current
Tue Apr 01 2008, 03:06PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Which better ways do you mean?
I had something like this in mind, which is symmetric:

1207062364 152 FT42416 Waveform2


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Nik
Tue Apr 01 2008, 03:07PM
Nik Registered Member #53 Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
Thats pretty much what a cheap light dimmer does.
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teslacoolguy
Tue Apr 01 2008, 03:58PM
teslacoolguy Registered Member #1107 Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
Steve Conner did something very similat to that Link2 Link2
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Steve Conner
Wed Apr 02 2008, 09:21AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Well, I guess I did make that driver, but I never thought of using it in the way Plasmaddict suggested.

It's a clever idea, and I can't see any reason why it wouldn't work. People use light dimmers to drive ignition coils and induction coils all the time.
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