Secondary of a transformer as a choke?

Andypairo · 25th October 2002, 08:27 AM

I came in possess of 4 *12-100VA toroids and I was wondering if the secondary windings could be used as filtering chokes (between the bridges and the caps) or in a PI filter.

I guess the answer is no due to saturation of the core.. am I right?

Thanks

Andypairo

Petter · 25th October 2002, 09:42 AM

It will work for very low currents, then you get into saturation and inductance will drop off very fast.

Now, you might be able to do something with the primary -- like perhaps place a coil in series with while attempting to use the secondary as the inductor. Thus you will get an inductance which looks like a much larger value than the one you are putting in there + you get some reactance from the transformer.

If it is not a toroid you might be able to pull the thing apart and create a small air-gap. Then you might even be able to use the primary as inductor, or even wire the two in series.

Petter

Andypairo · 27th October 2002, 09:50 AM

A inductance on the primary side prevents core from saturating?
Or do you think is better (two of these have broken promary) to unwind the secondary and use the wire for making a inductor?

Cheers

Andypairo

25th October 2002, 08:27 AM	#1
Andypairo diyAudio Member Join Date: Sep 2002 Location: near Milano , Italy	Secondary of a transformer as a choke? I came in possess of 4 *12-100VA toroids and I was wondering if the secondary windings could be used as filtering chokes (between the bridges and the caps) or in a PI filter. I guess the answer is no due to saturation of the core.. am I right? Thanks Andypairo

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25th October 2002, 09:42 AM	#2
Petter diyAudio Member Join Date: Jan 2001 Location: Scandinavia	It will work for very low currents, then you get into saturation and inductance will drop off very fast. Now, you might be able to do something with the primary -- like perhaps place a coil in series with while attempting to use the secondary as the inductor. Thus you will get an inductance which looks like a much larger value than the one you are putting in there + you get some reactance from the transformer. If it is not a toroid you might be able to pull the thing apart and create a small air-gap. Then you might even be able to use the primary as inductor, or even wire the two in series. Petter

27th October 2002, 09:50 AM	#3
Andypairo diyAudio Member Join Date: Sep 2002 Location: near Milano , Italy	A inductance on the primary side prevents core from saturating? Or do you think is better (two of these have broken promary) to unwind the secondary and use the wire for making a inductor? Cheers Andypairo