atx power supply inductor operating max. frequency ?

gev · 8th May 2010, 09:03 AM

Hello

standard pc power supply (tl494 control) output filter inductor what is the operating max. frequency ?

cjk2 · 03:19 PM

Quote:

Originally Posted by gev

Hello

standard pc power supply (tl494 control) output filter inductor what is the operating max. frequency ?

These get lossy at around 300khz to 500khz or so I would say. Is it the yellow/white material or the green/blue variety? You can likely look up a datasheet for it.

gev · 8th May 2010, 06:43 PM

thanks @cjk2 yellow - white material

mag · 10th May 2010, 08:55 PM

Hello, this yellow-white core seems a
micrometals material -26 or some chinese "equivalents" usually found
in cheap atx power supplies.

Max operating frequency depends on the losses you can tolerate (temperature rise) an on the AC magnetic flux density swing.

First calculate your AC flux density swing and check on micrometals website a graph called core losses wrt. frequency and flux density for material -26 and check for core losses.

Material -26 has relatively high core losses compared to other iron powder cores and it is normally not suitable for operation above 50kHz more or less.

8th May 2010, 09:03 AM	#1
gev diyAudio Member Join Date: Jul 2005 Location: Turkey	atx power supply inductor operating max. frequency ? Hello standard pc power supply (tl494 control) output filter inductor what is the operating max. frequency ? __________________ 320volt.com Elektronik ve biraz daha fazlası

8th May 2010, 06:43 PM	#3
gev diyAudio Member Join Date: Jul 2005 Location: Turkey	thanks @cjk2 yellow - white material __________________ 320volt.com Elektronik ve biraz daha fazlası

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10th May 2010, 08:55 PM	#4
mag diyAudio Member Join Date: Jan 2008 Location: Chiasso	Hello, this yellow-white core seems a micrometals material -26 or some chinese "equivalents" usually found in cheap atx power supplies. Max operating frequency depends on the losses you can tolerate (temperature rise) an on the AC magnetic flux density swing. First calculate your AC flux density swing and check on micrometals website a graph called core losses wrt. frequency and flux density for material -26 and check for core losses. Material -26 has relatively high core losses compared to other iron powder cores and it is normally not suitable for operation above 50kHz more or less.

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