[Ktechlab-devel] Grounded ground.

[Jason Lucas]

Alan,

I think that you have the deepest understanding of KTechLab (and it's
problems) on the forum. If you can translate this understanding into
producing solutions (i.e code) then I want you on the KTechLab
development team. 

Jason.
 
On Thu, 2007-05-31 at 23:40 -0400, Alan Grimes wrote:
> One of the deeper issues in Ktechlab is grounding.
> 
> The issue about the glitiching out to giga-volts, is comparatively
> trivial, requiring a better understanding of linear algebra, in that
> trying to patch a singular matrix with a tiny value instead of 1 is
> bound to make things a lot worse. (the problem being the singular matrix
> in the first place...)
> 
> Go research an app-note on power-factor correction circuits and try to
> implement the basic parts of the topolgy in ktechlab. Most of the
> schematics assume that the ground-symbol means "COMOMON" which is
> distinct from "Earth", (which is a different symbol).
> 
> Worse, Ktechlab inserts hidden earth-grounds where ever it feels like
> it. In fact, every line of code in the simulation classes assumes that
> these hidden grounds exist. I think if ktechlab were to adopt an "All
> voltages add to 0" approach, the simulation matrices it generates will
> be much easier to solve.
> 
> (the battery circuit in the attached would have a +2.5 volt side and a
> -2.5 volt side, equalling 0)
> 
> Another major change to the simulation engine I've been thinking about
> is the model for reactive components. Right now, ktechlab solves
> reactive components seperately from regular components because of the
> way the linear algebra system is coded. I think it would work much
> better if reactive components such as capacitors and inductors
> (including transformers) could request additional state variables in the
>  main simulation matrix for charge and magnetic flux, respectively.
> 
> An issue arises when you have iron core inductors, in that they saturate
> at a certain current... -- similar to how capacitors always have a
> finite breakdown voltage. But neither of these issues is yet addressed
> anyway.
> 
> /me just tried ktechlab 0.3.6. damn that thing gets slow after only a
> few minutes... =\
> 
> HTML document attachment (ground.circuit)
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