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modeling trafo

Discussion in 'Electronic Design' started by Michael Robinson, May 15, 2011.

  1. I'm trying to find the quickest way to account for saturation of a
    transformer in LTSpice.

    The reason I need to include saturation in the model is because it's a
    blocking oscillator.

    There's a nonlinear transformer model in the library at the yahoo group (the
    Chen model), but it includes a couple of parameters related to the
    hysteresis loop.

    I don't know what I would use for the hysteresis parameters and would like
    not to have to use those extra parameters, if at all possible. No B-H loop,
    just a transformer that can saturate, but has no hysteresis.

    There's an "arbitrary inductor" model that takes saturation into account
    while ignoring hysteresis. If I could use this model in a transformer by
    simply coupling two inductors it would make my life easy, because I have the
    volt-seconds figure for the trafo I intend to use.

    This wiki shows the inductor model:

    http://ltwiki.org/index.php5?title=The_Arbitrary_Inductor_model

    So I tried putting two arbitrary inductors in my schematic and coupling
    them. LTSpice tells me I can't use coupling with arbitrary inductors. Same
    result when I try to couple an arbitrary inductor with an ideal inductor.

    So I'm still at square one. Do I have to use the Chen model, or is there an
    easier way to do this?
     
  2. John KD5YI

    John KD5YI Guest

    Look in folder LTC\LTspiceIV\examples\Educational for
    NonLinearTransformer.asc

    See if that will help you.

    Cheers,
    John
     
  3. That's good. It says you can model a transformer that saturates by shorting
    the input of an ideal
    transformer with an inductor that saturates.
     
  4. John KD5YI

    John KD5YI Guest

    I ran the model and looked at the current into the magnetic device. It
    looks like a classical saturating magnetic device.

    Am I missing something?
     
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