[Openec] Patented NiMH charging algorithm

[Rafael Enrique Ortiz Guerrero]

The procedure to do an own OLPC charging algorithm for the NIMH  would be
like this..(if is needed):

Draw behavior graphs (of the NIMh) V/C (c/4,c/8.c/16) at different
temperatures, the battery has a temperature sensor that we could use to tell
the KB3700 what kind of info we need about the DS2756 (battery charger), the
DS2756 has EEPROM memory space that would have the necessary information
that we need to charge/discharge the battery, like the Current Accumulator
Interrupt High Threshold,   Current Accumulator Interrupt Low Threshold,
Temperature Interrupt High Threshold and Temperature Interrupt Low
Threshold..all this values are deduced from the behavior graphs, then all
this information can be read by the KB3700 via 1-wire protocol.

This would be an independent research from scratch that wouldn't break any
patents, (AFAIK), so for starters the algorithm wouldn't be as efficient as
quantas but from what i think would be good enough.

PS Also the same procedure could be applied to the life batteries, having in
mind that the deviations of the graphs for this batteries are much more less
than NIMH, (But they have slightly different behaviors at 20 40 y 60 Celsius
degrees), so probably an exclusive algorithm for our battery could be nice
the effort to try. (but this last paragraph is just a thought).

On 8/14/07, Richard A. Smith <richard at laptop.org > wrote:
>
> Rafael Enrique Ortiz Guerrero wrote:
>
> > i agree with this, joel and richard have access to the close code, so
> > they can tell like a flowchart about what the code is doing and trow
> > that information to the open source guys (like me and frieder..), so
>
> No we can't.  That information is confidential and protected under NDA.
>   Originally I thought we would be able to do that because GoldPeak told
> us that they would allow us to release that info.  Or at least thats
> what we _thought_ they told us. There was a miscommunication in what
> "opening up the technology" meant.
>
> But as Frieder says NiMh technology has been around for 15 years.  I
> suspect that there is lots of info available on charging NiMh batteries.
>    Somebody should start looking and compiling up whats already public.
>   Perhaps there are already patents that have expired.
>
> --
> Richard Smith  <richard at laptop.org >
> One Laptop Per Child
>



-- 
Rafael Enrique Ortiz Guerrero
OLPC Colombia
http://wiki.laptop.org/go/OLPC_Colombia
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