At 04.33 2011.11.17, you wrote:
>On 13/11/2011 09:56, Electron wrote:
>> At 20.52 2011.11.12, you wrote:
>>> On 12/11/2011 19:09, Electron wrote:
>>>> Thank You.
>>>>
>>>> A question, if You don't mind: I always used LTSpice "graphically". It=
's
>>>> easy to create two inductors. Now, how do I enter the coupling factor?
>>> On the far right of the LTSpice toolbar there is an icon (the ".op" one=
)
>>> for creating a SPICE directive. CLick on this and add Kn Ln Ln Kf, wher=
e
>>> n is the number of your components and Kf is the coupling factor.
>>> Example:
>>> You have two inductors, L1 and L2. You want to couple them with a facto=
r
>>> of 0.9, so you click on the .op icon and write:
>>> K1 L1 L2 0.9 (K could be any number, e.g K2, K3, etc depending on how
>>> many couplings you have in your circuit)
>>> Place the directive on the schematic somewhere and you're done.
>> It worked wonders, thank you! :-)
>>
>> But what does coupling=3D0.9 imply? 90% efficiency for the resulting=20
>transformer?
>>
>> Thanks,
>> Mario
>>
>
>It's one of the factors that contribute to efficiency, but there are=20
>others too (core losses, leakage inductance, etc)
>It's just the inductive coupling coefficient between windings. To=20
>simulate as accurately as possible you would have to add various other=20
>parasitic elements. If you google "spice transformer" there are quite  a=20
>few helpful links. Here are a couple of helpful ones:
>http://ltwiki.org/index.php5?title=3DTransformers    Reasonably simple and=
=20
>clear
>http://www.intusoft.com/articles/satcore.pdf=20
><http://www.intusoft.com/articles/satcore.pdf>    Getting more complex
>http://fmtt.com/Transformer%20SPICE%20Model%202-14-08.pdf     Approach=20
>with caution...

Thank You.. I will read the last one only in the presence of my parents. :D

;)

Cheers,
Mario

--=20
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