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Old 17th March 2005, 04:52 PM   #1
senee is offline senee  Thailand
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Default DC Choke for power supply

Hi All,

I would like to know air core choke and iron core choke, Which one is good DC choke for power supply amplifier.

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Old 17th March 2005, 06:40 PM   #2
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iron one I think
no purpose to use air choke, as aims are small R and high L, not linearity
cheers
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Old 17th March 2005, 10:00 PM   #3
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For DC use iron core coils should be gapped (EI type) or open and used within their intended rating to avoid core saturarion.

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Old 18th March 2005, 04:11 AM   #4
anatech is offline anatech  Canada
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Within their rating. The flux is what makes a DC choke effective. All EI cores have a "gap", but a gapped core takes this further. DC chokes have a current rating in their specs.
-Chris
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Old 18th March 2005, 04:17 PM   #5
AndrewT is offline AndrewT  Scotland
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Hi,
I am a bit of a newbie as far as chokes are concerned.
An air cored choke does not saturate. Imagine the gap = ring of iron. Big disadvantage of air cored is very large size and high resistance = very high cost.
how about a large diameter cylindrical ferrite core to increase the inductance? gap = the part of the ring that is missing.
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Old 18th March 2005, 07:05 PM   #6
anatech is offline anatech  Canada
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Hi AndrewT,
As long as you don't saturate the core, use the smallest one you can find. DCR will be lower and the footprint of the choke as well. There really is no point to using a larger component than is needed.
-Chris
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Old 21st March 2005, 01:26 PM   #7
senee is offline senee  Thailand
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I will Use DC Choke with power supply amplifier. It use current 3-5 Amp. I saw the power supply of Amplifier use DC Choke as attach file. I think, It will good than with out DC choke.(I'm not sure!!!)

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File Type: jpg aleph-x215.jpg (30.5 KB, 378 views)
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Old 21st March 2005, 09:48 PM   #8
K-amps is offline K-amps  United States
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Quote:
Originally posted by anatech
There really is no point to using a larger component than is needed.
-Chris

Ssssh Chris, I hope Dan D' didnt hear that one....
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Old 21st March 2005, 10:05 PM   #9
anatech is offline anatech  Canada
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Ooops! Jigs up.
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