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#83 ideal transformer

0.0.17
closed-invalid
Richard C
None
5
2013-06-20
2012-02-20
Thomas Bechteler
No

Hi QUCS developer!

The ideal transformers (both under "lumped components") in version 0.0.15 work.
However, they do not work in version 0.0.16!

Thomas

Related

Bugs: #83
Bugs: #99

Discussion

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  • Richard C
    Richard C
    2013-06-07

    Having investigated this, I think there is not a bug after all, and instead there is a misunderstanding of what the ideal transformer component actually does.

    The ideal transformer acts as a perfect current transformer, the current in the primary is mutiplied on the secondary. If you just put a voltage source across the terminals, it acts like a short circuit, so there is infinite current. At the same time in this case, there is no resistance, and therefore no voltage drop across the tranformer inputs, hence the output voltage is also zero.

    See here for more information:

    http://qucs.sourceforge.net/tech/node48.html

    The ideal transformer component does not reflect a real physical transformer device, a real device must have winding resistance and inductance, and only works with AC voltages. An ideal transformer can transform DC current, which is physically impossible in the real world (maybe some exotic superconducting device I'm not aware of).

    What changed in Qucs 0.0.15 -> 0.0.16 as far as I can tell was that the behaviour was actually corrected for DC simulation.

     
  • Richard C
    Richard C
    2013-06-07

    • status: open --> closed-invalid
     
  • Richard C
    Richard C
    2013-06-07

    As in my last post on this bug, there is no bug.

     
  • Frans
    Frans
    2013-06-07

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    Good! another bug to close



    On 07-06-13 18:00, Richard C wrote:




    As in my last post on this bug, there is no bug.




    [bugs:#83]
    ideal transformer


    Status: closed-invalid

    Created: Mon Feb 20, 2012 01:30 PM UTC by
    Thomas Bechteler

    Last Updated: Fri Jun 07, 2013 03:57 PM UTC

    Owner: Richard C


    Hi QUCS developer!


    The ideal transformers (both under "lumped components") in
    version 0.0.15 work.

    However, they do not work in version 0.0.16!


    Thomas




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    Related

    Bugs: #83

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