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Old 5th March 2008, 07:19 PM   #1
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Default Toroid Trafo as choke


Rooting through the storeroom today produced a toroidal 20-0-20-0 PSU, which when metered across the mains inputs (115-0-115-0 wired for 230V), yields 7.2H.

Anyone else done similar, and if so, did you just insulate the original taps?

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Old 5th March 2008, 07:28 PM   #2
kevinkr is offline kevinkr  United States
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Toroids have very limited tolerance for dc on their windings, likely if you use it as a choke the core will saturate and you will be left with just the winding dc resistance. Not recommended.
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
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Old 5th March 2008, 07:59 PM   #3
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<200mA limited ? No harm giving it a shot and seeing what happens, have access to non-toroid as well, so just a matter of experimentation
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Old 5th March 2008, 08:42 PM   #4
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I have tested a transformer as a choke and a toriod autoformer
as a choke in a choke input power supply. I Iloaded them to ~80% of there ac current rating with darn good results.
I think my results were about 5% different than calculated using
Duncan's power suply designer. Now this may not work in all cases but in the 2 cases I tried it sure did.
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Old 5th March 2008, 08:45 PM   #5
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Ta! Not massive current here, so I think we're well within our reach, it's a 50VA trafo, so...looks to be okay
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