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Ferrite question

Discussion in 'Electronic Design' started by Michael, Aug 4, 2008.

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  1. Michael

    Michael Guest

    How much heat is dissipated in deeply saturated ferrite? I am playing
    with home cooked series trigger transformer. It does get hot.
    The wire (fairly thin) does not seem to get hot (as long as I can
    judge by back side of my pinkie)
  2. Joerg

    Joerg Guest

    It often even isn't from one batch to the next. Also, Michael should
    keep in mind that core loss is temperature dependent and with some
    ferrites they reach a minimum at an elevated temperature. Go beyond that
    and things could seriously run away, and fast.

    And make sure the fire insurance policy is current :)
  3. Eeyore

    Eeyore Guest

    The data sheets will give you the figures. Losses vary widely with flux
    and actual temperature.

  4. Eeyore

    Eeyore Guest

    Epcos's Ferrite Magnetic Designer program will do it all for you (for their
    ferrites of course).

  5. Michael

    Michael Guest

    It's all good.

    My application is kind of unusual. It's series trigger transformer
    (1:50 primary:secondary). I hit primary with 200V, initiate spark and
    then discharge big cap through the secondary.
    Most of the current flows when ferrite is completely saturated. First
    (heating) transformer was wound by our tech, second (one that's
    running cool) - by me.
    Yes, buying series trigger transformer would be logical, but the
    manufacturer I contacted is not in a rush to get back to me (can you,
    guys, recommend somebody).
    The system works (kind of...), but I cannot explain the waveforms I am
    getting. I do not know how to make a website to place the pictures
    on... Any suggestions how to share the pictures???
  6. Eeyore

    Eeyore Guest

    First off, what's the repetition rate. You may have nothing to worry about if
    it's low.

  7. Michael

    Michael Guest

    alt.binaries.schematics.electronic has much less traffic and the
    traffic doesn't "look" nearly as professional as here.
    I'll try to get in touch with Ferroxcube engineering (if I can get
    through sales)
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