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Registered Member #2321
Joined: Fri Aug 28 2009, 05:13PM
Location: Boston, MA
Posts: 34
I have a handful of defunct ATX supplies that I've cannibalized for parts and don't know what to do with these yellow transformers.
Can they be used directly on 125V mains to step down to 12 and 5 VAC as a cheap power supply source? My goal is to add a linear rectification/filtering stage to use with ZVS.
Registered Member #1667
Joined: Sat Aug 30 2008, 09:57PM
Location:
Posts: 374
These transformers are designed to operate at higher switching frequencies. They are driven by the transistor or mosfet halfbrige and a capacitive divider. Now that you've already removed the important parts (I guess that is what you came for in first place), you can build resonant zero voltage switching converters out of the remaining transformers. The center tap is the braid of wires that emerges from the top.
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Yeah, I have a few of those ferrrite core transformers too. No idea what to do with them. What frequency are the ferrites good for? I need something that'd be good for 1500 watts to 1800 watts of power, at around 100 khz. Flyback cores aren't going to do so well from what I understand.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi, Apart from the normal and intended SMPS use, the best use I can think of for such a transformer is using it in reverse with a ZVS/royer driver to charge coilgun/railgun/laser/general destruction cap banks and suchlike, from batteries. The output can be ballasted with a single cap before the rectifier or a voltage multiplier could be used, which will itself act to limit the current. You could probably get many kW peak power for charging with a few of such transformers in parallel/series.
The PSU's also contain a base-drive transformer (for bjt's) which can be used as a current transformer (it has a 1 turn sense winding and like 20+20 turns primary winding).
The third transformer in there is probably the least useful since it's a flyback transformer with an air gap. I tried using one of those with those fairchild topswitch IC's with some success, only the topswitch would sometimes decide to blow up. Don't hassle with this transformer.
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ATX PSU trannys
