Flyback converter desing. Problems with requied gap and number of turns.

Discussion in 'The Projects Forum' started by Wojtek, Oct 6, 2015.

  1. Wojtek

    Thread Starter New Member

    Mar 19, 2015
    At first, I am sorry, but i have to post all my calculations as images.
    I have problem with requied gap for my core and number of turns on both sides. I don't know how to calculate primary inductance too.
    I was trying to design flyback by using this website: but i don't know how the autor gets the numbers of turns for both sides.

    Core: ETD44
    Ident. 1.5
    Al/nH: 194
    Ain/mm2: 17
    lin/mm: 103
    Amin/mm2: 172
    Wmax/µWs: 6862
    Bmax/mT: 281
    N1: 5
    N2: 6668
    N1 - number of primary turns,
    N2 - number of secondary turs,
    Wire Data:
    d1 ? 2.38 mm
    A1 ? 4.45 mm2

    d2 ? 0.08 mm
    A2 ? 0 mm2
    How to calculate wire diameters?

    I also did calculations in Mathcad so i am posting my results as jpgs. I am stuck at required gap and all the next calculations goes wrong.