Re: [Help-gnucap] pure inductance simulation

[Josef Vukovic]

010/7/1 al davis <address@hidden>:
> On Wednesday 30 June 2010, Josef Vukovic wrote:
>> I have a question reagrdig my gnucap simulation of a pure
>> inductance.
>>
>> Here is my gnucap code:
>>
>> Pure Inductance:
>>
>> V 1 0 sin(0 220 50)
>> L 1 0 100m ic=0V
>>
>> .print tran v(1) i(L)
>>
>> .tran .001 .02 >AcXl.dat uic
>> .end
>>
>>
>> When I plot the simulated data with gnuplot I get
>> a Voltage leading current by 90 degrees, but the
>> current is only positive and don't change to negative
>> values. How can I simulate a pure inductance with gnucap?
>
> The results are correct.
>
> The input starts at zero.  For as long as it is positive,
> current will rise.  When the input goes negative, current will
> drop, and continue to drop as long as it is negative.  Since the
> wave is symmetric, this returns it to zero, so in this case the
> current will always be positive.
>
> You can get negative current with a different starting point.
> Try setting ic=-10.   Note that for inductors, ic (initial
> condition) is current, even if you say "ic=0V".  The "V" is
> ignored.
>
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Hm, that's somewhat quiet confusing! Where is the alternating current
he sould change his direction :-( but anyway thank you for the explanation.

regards