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'[EE]: Low parts count PIC based solar Gel-Cell cha'
2001\02\27@181030 by Robert Swirsky-Warner

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Folks:

I've been considering designs for a PIC based  Gel-Cell charger (with
photovoltaic
power source.) I've been looking at the Maxim chips, but can't help to think
that someone's done this before, and that with a PIC and a few A/D channels
I can monitor voltage, temperature, battery charge (and run my application
from the same PIC.)

I searched the usual places, and turned up nothing. Anyone know of a simple
design for a PIC-based Gel-Cell charger? I thought that PIC was a major
supplier of chips for "smart" battery packs, but the app notes on their
site seem like overkill for keeping a gel cell happy.

--
Robert Swirsky-Warner
Walt Disney Imagineering, R&D

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2001\02\28@012051 by Roman Black

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Robert Swirsky-Warner wrote:
>
> Folks:
>
> I've been considering designs for a PIC based  Gel-Cell charger (with
> photovoltaic
> power source.) I've been looking at the Maxim chips, but can't help to think
> that someone's done this before, and that with a PIC and a few A/D channels
> I can monitor voltage, temperature, battery charge (and run my application
> from the same PIC.)
>
> I searched the usual places, and turned up nothing. Anyone know of a simple
> design for a PIC-based Gel-Cell charger? I thought that PIC was a major
> supplier of chips for "smart" battery packs, but the app notes on their
> site seem like overkill for keeping a gel cell happy.

If using solar cells, try a web seach for MPPT
regulator design. This is a variable current
system that adjusts current to get the max power
from solar cell at any light condition. I invented
it at 12 years old and thought "it'll never catch
on"... Years later someone else thought of it
and it became big money industry.

As far as the gell cell goes, the simplest system
is to use a voltage regulator to limit max charging
voltage. If you never charge them over a set voltage
they last for many years.
-Roman

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2001\02\28@110355 by Harold M Hallikainen

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       A while back I helped a student desgin the battery charger for the Cal
Poly Solar Car Club. This used a bunch of step-up converters (one per PV
panel) with the PIC generating the PWM to drive the FET. The PIC would
watch the current driving the battery from each converter and adjust the
pulse width driving the FET to maximize the current out of the converter
and into the battery, loading the PV panel at its maximum power point.
The use of separate converters for each panel allowed for varying
illumination of the panels, since they surrounded the car. Some faced the
sun, some did not.

Harold


On Tue, 27 Feb 2001 14:53:45 -0800 Robert Swirsky-Warner
<spam_OUTswirskyTakeThisOuTspamSWIXO.COM> writes:
{Quote hidden}

FCC Rules Online at http://hallikainen.com/FccRules
Lighting control for theatre and television at http://www.dovesystems.com

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