High Frequency Transformer

Discussion in 'The Projects Forum' started by Peytonator, May 11, 2011.

  1. Peytonator

    Thread Starter Active Member

    Jun 30, 2008
    105
    3
    Hi there,

    I built a high frequency transformer:

    • f = 80kHz (square wave)
    • 15 primary turns, 45 secondary (turns ratio 3)
    • Ferrite core
    All my calculations tell me that I'm not loading the source or saturating, but I get strange waveforms on the primary and secondary.. I can't seem to post the image (too big), but the positive plateau slopes downwards and the negative upwards. It does a little kink at each transition. What's going wrong and how do I fix this?

    Thanks :)
     
  2. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
    804
    Is that a halfbridge? If you can´t post images here, post it for example on imageshack a put here the link.
     
  3. someonesdad

    Senior Member

    Jul 7, 2009
    1,585
    141
    There are a gazillion free programs out there to resize pictures for you. IrfanView is one.
     
  4. wayneh

    Expert

    Sep 9, 2010
    12,145
    3,054
    It's an inductor. What makes you think anything is wrong?
     
  5. Adjuster

    Well-Known Member

    Dec 26, 2010
    2,147
    300
    It sounds as if the primary inductance is too low. Do you know the Specific Inductance (Al) value of the core?

    The inductance is given by L = N^{2} * Al , so with N=15 you would have L = 225 * Al.
     
  6. Adjuster

    Well-Known Member

    Dec 26, 2010
    2,147
    300
    Right enough, how important is it to preserve flat tops and bottoms anyway - and for that matter, how much tilt are we talking about: 10%, 50%, or what?

    I think you are going to need to get to grips with posting images.
     
Loading...