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4hv.org :: Forums :: General Science and Electronics
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Transformer Questions

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currentkills91
Mon Jun 17 2013, 07:19PM Print
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
Location:
Posts: 265
 		I am working on a DC-DC converter, using a push pull setup, and wanna use an E core transformer I have.

I tried finding something on here and on Google but couldn't find anything too helpful.

The core is gaped on the middle legs, and I was wondering if that will effect anything using this topology?

The converter will only be used for about 100 watts if that makes any difference.
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Ash Small
Mon Jun 17 2013, 07:46PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
 		As far as I'm aware, gapped cores are GENERALLY only used for flyback topology.

You could try grinding them down by rubbing on abrasive paper, but you don't want to get them too hot, so don't use a grinder without coolant.
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currentkills91
Mon Jun 17 2013, 08:36PM
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
Location:
Posts: 265
 		I figured as much, I dont have anything handy I could use to grind it down, I have a toroid core that would work if I had to use it.

Is there any good places to buy ungaped E cores?
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Sync
Mon Jun 17 2013, 08:40PM
Sync Registered Member #510 Joined: Sat Feb 10 2007, 09:28AM
Location: Hannover
Posts: 12
 		Most stores that sell cores will have ungapped cores.
You need to grind them to a fairly good degree of flattness/precision for them to be efficient. It is easier to just buy the right core.
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currentkills91
Tue Jun 18 2013, 01:46AM
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
Location:
Posts: 265
 		I dug through my cores and I found a toroid that came from the power supply of a 150W (400W peak) amplifier. It measures 1.25" OD, .75" ID, and it's .5" thick. Think this core will be able to do 100W continuous?
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Inducktion
Tue Jun 18 2013, 02:09AM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
 		Alternatively, you could try using a flyback transformer core as well if you're not looking for too high of power output.
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currentkills91
Tue Jun 18 2013, 02:13AM
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
Location:
Posts: 265
 		Well I stated in the first post that I will only be drawing about 100 watts from the converter. I believe I have a core that will work now though.
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Daedronus
Tue Jun 18 2013, 07:24AM
Daedronus Registered Member #2329 Joined: Tue Sept 01 2009, 08:25AM
Location:
Posts: 370
 		get one dead computer PSU and take out the core (and possibly other goodies, like high amperage diodes).
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currentkills91
Tue Jun 18 2013, 05:55PM
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
Location:
Posts: 265
 		I actually have acquired 3 Xbox 360s, 3 computer motherboards, 3 ATX power supplies, and an old CRT monitor just the other day. I have been going crazy taking all the parts off.

I'm trying to make the design small, so I don't wanna use one of the big cores. Are there any general rules to core size and power?
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Ash Small
Tue Jun 18 2013, 11:01PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
 		I'd guess four square centimetres per killowatt, so ~160 mm^2 for 100 Watts.

Others may have different opinions.

(check my maths. Maths isn't my forte)
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