Re: [Qucs-devel] Modellig batteries with Qucs

[Stefan J. <st...@gr...>]

Am Fr, 9.06.2006, 09:26, schrieb Jakubowski:

Hello there,

> The thermal batteries we are manufacturing are driven by two key
> parameters:
>
> 1.EMF (Electro Motive Force):
> This is the "pure" voltage source, the value is quite stationary during
> the
> discharge of the battery and depends on electrochemical potential of
> materials. Once the battery is exhausted (quantity of current pulled) this
> value decay quickly toward zero.
>
> 2.Internal resistance
> For the particular case of our thermal battery, the internal resistance is
> nearly infinite a ambient temperature. When the battery is ignited, an
> internal heat source causes this internal resistance to reach a few ohms
> within a second. While the battery cools down, the internal resistance
> increases.
> You are right to say that these two phases can be modelled with
> exponentials: one decreasing with time and a second one increasing.

Thus I think that the battery can be modeled as a current source with
an internal resistance, very likely our Pac (power ac source).

> Regarding the C/C++ programming, do you have a specification describing
> the
> interface to implement a module?

You can take qucs-core/src/components/pac.cpp as a template.

Unfortunately we don't have (yet) a module system defined.  Depending on
your time schedule we could start to do that since your model seems
easy enough to act as a good example to start with.  What do you think?

Cheers, Stefan.