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I have a transformer with a 110-1 turns ratio.

The output winding (1100 turns) is typically open circuit, with only its parasitic capacitances as a load.

The output winding has adjacent turn capacitance, layer to layer capacitance as well as capacitance of the output wires.

The input winding is 10 turns.

If I know the inductance and the ringing frequency on the output when pulsed, can I then determine the proper capacitance to put on an ideal transformer in modeling (LTSpice or similar)?

Assume air core so saturation isn't a problem.

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  • \$\begingroup\$ It's kinda of a PITA with LTSpice to be honest. I've never been able to get a satisfactory model that takes saturation into account working. \$\endgroup\$
    – DKNguyen
    Commented Feb 20, 2020 at 21:30
  • \$\begingroup\$ I vaguely remember reading something about this in The Art of Electronics: The x-Chapters but it might have been just the saturation in a single inductor, not mutually coupled in a transformer. \$\endgroup\$
    – pipe
    Commented Feb 20, 2020 at 21:32
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    \$\begingroup\$ Would this be of help? Also, you'll probably have to include an equivalent parallel resistance for some losses, too. Also interwindings capacitance, skin efect would be nice (if needed). In the end, you shouldn't expect a model to accurately reflect reality, but that doesn't mean you can't try. \$\endgroup\$
    – a concerned citizen
    Commented Feb 20, 2020 at 22:36
  • \$\begingroup\$ I had a look thru X-Chapters but didn't see anything. \$\endgroup\$
    – user121934
    Commented Feb 20, 2020 at 22:47
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    \$\begingroup\$ Yes you can transform the primary capacitance to secondary and select a secondary capacitance to match resonance of your 1:110 XFMR \$\endgroup\$
    – D.A.S.
    Commented Feb 21, 2020 at 0:22

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