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Circuit Maker, Trasformer

Discussion in 'CAD' started by [email protected], Dec 13, 2004.

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  1. Guest

    I am trying to simulate a circuit in Circuit Maker which involves a
    Transformer.
    But I do not know how I should enter the values for number of Turns of
    the Transformer

    anyone having any Ideas?
     
  2. Leon Heller

    Leon Heller Guest

    SPICE (assuming that is what it uses) only knows about inductance.

    Leon
     
  3. Jim Thompson

    Jim Thompson Guest

    And coupling.

    ...Jim Thompson
     
  4. If you're working with transformers as voltage converters, as in a
    familiar mains supply for example, then it's *ratios* that are key.

    Simply choose from CM's list of models a transformer with an
    appropriate primary/secondary turns ratio. D-click and edit it if you
    want a different ratio. Here's an illustration.
    http://www.terrypin.dial.pipex.com/Images/CMTransformers.gif

    You can also change primary and secondary DC resistance, leakage
    inductance, and magnetizing inductance if you want. Give your edited
    subcircuit a new name, as I've done in the example, so that you can
    use it again quickly in future.

    BTW, there's a side issue here that's always irritated me. CM offers
    two symbols for its transformers. One is symmetrical (as shown top
    right corner). The other always shows the fewer turns on the left,
    regardless of the turns ratio, making it always look like a step-up
    transformer. So I often mirror-flip it, to match my mental picture of
    a real mains transformer. Of course, the name is then misleading! Or
    you can choose the 'correct' name (I'd like a 240-to-40 transformer to
    be called 10TO1), but then you can't flip it as you get the wrong
    voltage on the secondary!
     
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