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xyz9915 28th March 2008 07:40 AM

Selection of proper wire for Ferrite core
 
Please help me that how do I determine proper wire size in SMPS for building a ferrite core transformer.

areza 28th March 2008 10:12 AM

use as thick as possible , always try to keep the frequency low , for 15-50 khz use one single wire , above 75khz try to use several thin cluster of wire, try to use foil if itís a big "E I" shape core and if its only few turns ,

Tolik 29th March 2008 06:56 PM

Quote:

use as thick as possible
what about skin effect looses ?

http://www.bcae1.com/trnsfrmr.htm

areza 31st March 2008 03:57 PM

unavoidable effect if the frequency is 50khz and up and if itís a 500w up design, donít really worry about skin effect cos my favourite frequency is 25khz, bmax +- 1000 to 1500, never had a problem with this settings, till now i manage to smoke some fuse and some wire but no fets,

cerrem 31st March 2008 06:00 PM

Re: Selection of proper wire for Ferrite core
 
Quote:

Originally posted by xyz9915
Please help me that how do I determine proper wire size in SMPS for building a ferrite core transformer.
You choose wire size by current density such as Circular Mills per Ampere... 500cm/A to 800cm/A is the general range, since you always lean towards the higher, provided you can fit it...
Once you determine the wire size in cm for the given current.. You then look at the switching frequency skin effect.... Which is usually always a factor... You then divide up the Circular Mills you choosen into more smaller wires in parallel that also add up to same cm....The wire gauge you choose is based on the skin effect.... For example # 27AWG is the largest single wire you want to use with 200kHz based on skin effect...

Chris


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