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Design >> Analog Design >> battery model
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Message started by boby on Jun 26^th, 2005, 9:55pm

Title: battery model
Post by boby on Jun 26^th, 2005, 9:55pm

Hi,
Does somebody know how to model an exhausted battery in the battery charger circuit? A huge Cap is ok?

Title: Re: battery model
Post by Eugene on Jun 27^th, 2005, 10:47am

The last time I modeled a battery for charge/discharge time scales I used a macro model composed of large capacitors, resistors, and I a couple of diodes. Since then, VerilogA has emerged. VerilogA should make it easy to model a battery. I would probably first try a large nonlinear capacitor and perhaps some nonlinear resistors. I'd have to see the charge and voltage profiles to say much more. I am almost certain the profiles will depend on the type of battery you are modeling.

Title: Re: battery model
Post by sheldon on Jun 28^th, 2005, 2:08am

Boby,

Try the model in the following reference, " A PSPICE Macro-Model for
Li-Ion Batteries", Sean Gold, Battery Conference on Applications and
Advances, 1997. It is relatively easy to implement this model in Verilog-A
using table models. It is a little more work than using a capacitor but it
is a better model of the load your charger will be driving. You might also
want to try the following source, http://www.analoghome.com/articles.html.
In the past, Steve has provided information on some of the battery models
he has published in the past.

Best Regards,

Sheldon