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Ferrite Transformer ?

Discussion in 'Electronic Basics' started by [email protected], Mar 21, 2007.

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  1. Guest

    Some hobby project uses E or Round type of ferrite transformer which
    are found in the HV driver
    circuit. As this is uncommon or a standard type item, i like to know
    how to self made one,
    i don't understand why the primary and secondary winding use different
    wire size ? and how to select the size or shap of the ferrite core for
    optimal result ?Could any person help me in this.
    Thanks in advance.
    Regards
     
  2. Rich Grise

    Rich Grise Guest

    This would be a horrendously challenging project for a newbie. Your best
    bet would be to find one that you can sacrifice, and dissect it, to see
    how it's done - this would also yield a core that you know will work at
    the frequency of interest.
    Different current-carrying capability.
    This is a whole field of study; even some experts don't know the black
    magic involved here.
    Your best bet would be to go to a library and look for books on
    transformer design, or maybe google for something similar. I don't know
    if anyone around here would be willing to take on such a big task as
    teaching you about ferrites and such, over USENET.

    If you're seriously interested in it, signing up for a formal school
    class would be the way to go.

    Good Luck!
    Rich
     
  3. It would be helpful if you better described the particular application.
    These types of transformers are used from audio frequencies thru several
    hundred MHz.

    I don't know what you mean by "round". If you mean torroidal (do-nut shape)
    then yes they are quite common. You may have to look harder for bars of the
    material, but I don't really know that for sure. The secret to these things
    is the composition of the material making them up. They may all look the
    same, but the materials making them up vary quite a bit. Usually iron
    powder and other magnetic metals are combined with ceramics in a proprietary
    mix depending upon the application. Some materials enhance the inductance
    very little, while some have tremendous effect. Again in RF applications,
    this makes it possible to create coils for low frequency HF and not have to
    use hundreds or even thousands of turns of wire. Some core materials have
    so much inductance that they are pretty much only good for making RF chokes,
    like you see on monitor cables etc...
    It may be for current capacity reasons or space reasons. In RF applications
    transformers are typically wound with the largest wire that will fit the
    core to keep resistance to a minimum. This enhances the Q factor of the
    coil and also reduces self heating. I'm sure there are probably other
    reasons as well.
    www.amidoncorp.com would be a good place to start.

    Do-nut shaped cores are nice because they are "self shielding". This is
    nice in RF applications because it keeps the signals where they belong
    better.
     
  4. Eeyore

    Eeyore Guest

    Because the size of the wire is related to the current. If it's a step-up
    transformer for example, the secondary current is lower than the primary
    current.

    Learning transformer design is not a trivial (easy) task ! Some aspects of it
    are quite straighforward but the detail is complicated.

    Graham
     
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