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LTspice / SwitcherCAD III and Bridge Rectifier question

Discussion in 'Electronic Basics' started by Larry Brasfield, Mar 16, 2005.

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  1. You have learned, early, the widely known fact
    that the available models (assuming they are any
    good) are a big part of the value of any simulator
    For playing, if you can find some 1A 200V
    diodes, just hook them up and be happy. Or,
    if you want to play with component creation,
    do that. Library editors can be a real challenge.

    Have fun.
  2. Chretien

    Chretien Guest

    I am a novice. And even more of a novice at this spice program.

    I am trying to "play" with the program to see how it works etc. So Im taking
    some schematics and replicating them in the spice program to see how it
    My current sample project requires a 1 Amp 200V Bridge Rectifier.

    I cannot see this component in the components list. Am I missing something?
    Am I suppose to use 4 Diodes as a work around or should I move to the next
    step in this program and make a new component?

  3. Yes, especially if you will be simulating "real"
    circuits (using "real" parts and which will end
    up becoming actual hardware), where their
    performance or predictability matters.
    I'll take a look, thanks.
    If you are merely interested in play, it hardly
    matters what you do if you enjoy it. But if
    your play is a learning exercise, with some
    future useful application in mind, then you
    would do well to get past the "pull in what
    appears in the menus, hook it up, hit run"
    phase. Using models not provided by the
    simulator vendor is an important part of that.
    In SwitcherCAD and most other SPICE simulators,
    you can arrange for whatever statements you like to
    end up in the "(card) deck" that is actually input to
    the simulation engine.

    Lookup the help on the .MODEL and .SUBCKT
    directives. By including the models you get from
    a manufacturer (which will generally be in either
    model or subcircuit form) as text items in your
    schematic, marked as "SPICE directive" in the
    dialog that creates/edits them, you can make the
    models available. By slightly editing the devices
    you use, they can be made to use those models.

    There is a whole different scheme for incorporating
    models, subcircuits and schematics into library
    components you create. See the help for that.

    There is a forum for LTSpice on Yahoo. That
    would be a better place take the more detailed
    questions that will surely arise as you proceed.
  4. Chretien

    Chretien Guest

    Thanks for the input.

    I think I have seen that some manufacturers have (of course) their own
    components that you can download and put into these programs. Is this
    something worthy to do?
    eg. see link for a nice collection

    I would rather spend my time on developing the project than developing the
    project that's developing the project if you know what I mean.

    How do you use these files anyway I can't seem to see any import mecanism?

  5. Chretien

    Chretien Guest

    Thanks for your advice and helpful hints.
    I'll persevere. Right now Im just trying to understand the program. Its just
    for enjoyment and hobby.
    I'll also look at the LTSpice forum for a little more On Topic help.

  6. In that case, I suggest you just use 4 of the generic ideal diode on
    the tool bar connected as a bridge. The voltage drop won't be exactly
    what some particular bridge component produces, but the result will be
    representative of most diode bridges.
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