I added two photos that show how to construct the waveform both in Simulink and
SPICE. ( Photos directory /g/LTspice/album?id=301365 )

The key problem is that neither Simulink nor LTspice allow to construct the Laplace transform of a waveform.
They only provide a way to construct a transfer function.
For LTspice it was an interesting learning moment as I had never before needed to manipulate the two parameters
of the Laplace function (Window and NFFT). They still work in 17.1.5.

-marcel

开云体育

Recently I compiled several models created by another group's member into one single library.

Do you mean the original author did not belong to this group, but to another group? Or did you mean another member of this group? I understand English is not your native language.

Moreover, I slightly modified them for my need but I think it could be useful for other people here.

I tried to contact the original author on his own email to ask his authorization, but I didn't have his reply yet.

Moreover, it seems that he didn't come on the group since a long time.

This group has been around a long time. It is possible the author (if they were a member of this group) is either no longer an active member, or has passed on.

His there a rules on the forum for this kind of situation, or am I free to publish here without his authorization (but by mentioning his name however...) ?

Thanks a lot in advance for your advices,

If you are not able to make contact, you can publish what you have done, but it is good etiquette to acknowledge the original author in notes in your library, and also mention their name in any announcement (message or upload description) you make.

You can also contact the moderators, as already suggested, for further information that may be available.

--
Regards,
Tony

开云体育

Hi, Andy. I think you may have misunderstood:

"Recently I compiled several models created by another group's member into one single library."

"group's" is how you would write it in French, but in English it would be 'group' so that 'another' relates to 'member', not to 'group'. In other words, the member is a member of this group, not another group.

On Tue, Mar 18, 2025 at 04:47 PM, <pilou@...> wrote:

(H)is there a rules on the forum for this kind of situation, or am I free to publish here without his authorization (but by mentioning his name however...) ?

Do the other models have a copyright of any kind?? Is there anything either in the models or on the page for downloading them, that says they are copyrighted?

?

I think that would be where to start.

?

Do you know that this person actually created the models, or did they collect models from other sources?? That's another consideration.

?

If the other group is readily accessible by the public, maybe the simplest solution with the smallest risk, would be to announce the location of their models in the other group.? But that might not be optimum.

?

Andy

?

开云体育

You can send the email address of the member confidentially to the moderators at: LTspice moderators <[email protected]>, so that you can be advised on this subject.

Hello,

Recently I compiled several models created by another group's member into one single library.

Moreover, I slightly modified them for my need but I think it could be useful for other people here.

I tried to contact the original author on his own email to ask his authorization, but I didn't have his reply yet.

Moreover, it seems that he didn't come on the group since a long time.

His there a rules on the forum for this kind of situation, or am I free to publish here without his authorization (but by mentioning his name however...) ?

Thanks a lot in advance for your advices,
Pascal

开云体育

Same thing with 24.1.4

C:\Users\NAME\Documents\Simulation\ESD\IEC_61000-4-2_Test (1)\IEC_61000-4-2.inc(201): Monotonically increasing value expected.
1.00E-09,0.9088###>
1.00E-09<###,0.9110

The look-up table has been updated for increased precision. New zip uploaded.

开云体育

Just to note, in the latest LTspice 24.1.5, it will have the following message... It seems 'SCOPEDATA=' is forced to replace the 'file='.

Looks like, compatible issue between newer & older...was used to the older XVII...

?

"Monotonically increasing value expected. You may want to use SCOPEDATA=<filename> instead. (See the LTspice help for more details.)
1.00E-09,0.9088###>
1.00E-09<###,0.9110"

The look-up table has been updated for increased precision. New zip uploaded.

开云体育

Your are telling LTspice that you want the y-value to be 0.9088 and 0.9110 simultaneously at time 1ns. What would be the correct behavior here that universally applies to all use cases?

?

Best Regards,
Mathias

?

On Tue, Mar 18, 2025 at 08:27 AM, <emilien.sabard@...> wrote:

Hi,

Same thing with 24.1.4

C:\Users\NAME\Documents\Simulation\ESD\IEC_61000-4-2_Test (1)\IEC_61000-4-2.inc(201): Monotonically increasing value expected.
1.00E-09,0.9088###>
1.00E-09<###,0.9110

This is my fault, my spreadsheet truncated the number of decimal places in the table. I'll upload a fixed version, presently. Interesting that it was previously accepted without error.

开云体育

The difficult bit is deriving the temperature from the applied voltage, or? the filament current. However, I think you can use a 'backwards'? trick, by defining the temperature as the initial condition. It should be well above room temperature, but not so high that the filament glows. Try 300 C. I posted some data about the tempco of tungsten a few days ago, which gives you alpha.? Using the equation R=Rcold?(1+alpha?(T?Tcold)), with R0 = room temperature resistance and To is room temperature you can get R at T = 300 C.

I put this together. Hope you need it.

?

R0 = lamp voltage rating^2 / power rating
T0 = start temp
T = temp
alpha = temp coefficient of tungsten/filament material

?

R=R0?(1+alpha?(T?T0))