Design Step Down AC Transformer from Scratch

Discussion in 'The Projects Forum' started by Mouses, Mar 1, 2015.

  1. Mouses

    Thread Starter New Member

    Mar 1, 2015
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    Hi,

    I want to design transformer to step down from 120 V @ 60 Hz on primary to 15 V and max 1 A of current on secondary . To make winding easy for me I am going with EI core.
    I hope to utilize Kgfe (core geometrical constant) method how to determine core size but even if I had spent countless hours looking into datasheets of different manufacturers (I don't want to break any anti-advertisement rule here, but one of them is mentioned in linked pdf about Kgfe method in the beginning of example #1. ), I wasn't able to convert provided specs into Kfe (core loss coefficient) and Beta coefficient.
    Given that core loss Pfe = Kfe*(dB^{Beta})*Ac*lm
    Can you point me out as how to use this method with data which are actually available?

    Thanks.
     
  2. ronv

    AAC Fanatic!

    Nov 12, 2008
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  3. MaxHeadRoom

    Expert

    Jul 18, 2013
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    It has been my experience so far that there is virtually no definitive transformer design criteria out there.
    Max.
     
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  4. shortbus

    AAC Fanatic!

    Sep 30, 2009
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  5. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    Thats a 8:1 turns ratio, just select the size of wire that will give you the secondary current.
     
  6. Mouses

    Thread Starter New Member

    Mar 1, 2015
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    Thanks,
    although it doesn't seem to be related to Kgfe method. I will go through it and post back if I am able to put it in any relation with the theory I am already familiar to.
    M
    I'll check - thanks.
     
  7. Mouses

    Thread Starter New Member

    Mar 1, 2015
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    Thanks, but I wanted to compute size of the core with that particular method which I've mentioned. I don't have troubles with turn ratio.
     
  8. Mouses

    Thread Starter New Member

    Mar 1, 2015
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