DC Choke for power supply

senee · 17th March 2005, 03:52 PM

Hi All,

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

darkfenriz · 17th March 2005, 05:40 PM

iron one I think
no purpose to use air choke, as aims are small R and high L, not linearity
cheers

apassgear · 17th March 2005, 09:00 PM

For DC use iron core coils should be gapped (EI type) or open and used within their intended rating to avoid core saturarion.

Cheers...

anatech · 18th March 2005, 03:11 AM

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

AndrewT · 18th March 2005, 03:17 PM

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.

anatech · 18th March 2005, 06:05 PM

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

senee · 21st March 2005, 12:26 PM

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!!!)

K-amps · 21st March 2005, 08:48 PM

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....

anatech · 21st March 2005, 09:05 PM

Ooops! Jigs up.

17th March 2005, 03:52 PM	#1
senee diyAudio Member Join Date: Jun 2004 Location: Central in Thailand	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. __________________ Senee

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17th March 2005, 05:40 PM	#2
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	iron one I think no purpose to use air choke, as aims are small R and high L, not linearity cheers

17th March 2005, 09:00 PM	#3
apassgear diyAudio Member Join Date: Nov 2002 Location: Viña del Mar, Torreon	For DC use iron core coils should be gapped (EI type) or open and used within their intended rating to avoid core saturarion. Cheers...

18th March 2005, 03:11 AM	#4
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	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

18th March 2005, 03:17 PM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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.

18th March 2005, 06:05 PM	#6
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	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

21st March 2005, 09:05 PM	#9
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Ooops! Jigs up.