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From: Fabian on 18 Aug 2006 11:08

Terry Given wrote:

> Fabian wrote:
> > Terry Given wrote:
> >
> >
> >>Very interesting.
> >>
> >>Did you have to do anything fancy to ensure the capacitor voltages were
> >>equal?
> >>
> >>Cheers
> >>Terry
> >
> >
> > Nothing fancy there :-) Epcos offers a specially designed voltage
> > equalisation modules for large capacitor banks, but since ours was
> > relatively small (it used only six caps of the smallest value), I
> > decided to go with a simple pasive equalization network made of
> > resistors.
> > If you are interested, there is a detailed Epcos application note
> > in which compares both methods with calculation examples.
> >
> > Best regards,
> > Fabian Picca.//
>
> I'm just curious really. some guys I know are considering building an
> HVDC bus using supercaps, and my guess is that voltage sharing is pretty
> important, as there are so many in series (hundreds).
>
> do you have a link to the app note?
>
> Cheers
> Terry

The application note I mentioned was part of an earlier Epcos
Ultracapacitor handbook, but I think it is included in the current
"UltraCap - Data sheet collection 2005" you can grab at:
http://www.epcos.com/web/generator/Web/Sections/ProductCatalog/Capacitors/Ultracapacitors/Page,templateId=render,locale=en.html

Additional application notes can be found at Maxwell Technologies:
http://www.maxwell.com/ultracapacitors/support/app_notes.html
http://www.maxwell.com/pdf/uc/app_notes/AN-002_Cell_balancing.pdf

Finally, these articles might be of your interest too:
http://powerelectronics.com/mag/409pet24.pdf
http://www2.ing.puc.cl/power/paperspdf/dixon/tesis/PhDOrtuzar.pdf
http://www.ece.auckland.ac.nz/~p4p_2006/archive/reports2005/pdfs/jbea035.pdf

Kind regards,
Fabian Picca.//

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