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'[OT]:Nicad Charger'
2000\12\03@124911 by G Child

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Has anyone had any experience making a peak detect nicad charger that will
charge 6 to 8 nicads at up to 5 amps from a 12 volt source. Any suggestions
would be greatly appreciated.

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2000\12\04@091302 by David Kott

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> Has anyone had any experience making a peak detect nicad charger that will
> charge 6 to 8 nicads at up to 5 amps from a 12 volt source. Any
suggestions
> would be greatly appreciated.
>

The Maxim MAX712/713 will do this.  Its termination options include time
(programmable interval), temperature and peak detect.

Naturally, you can also program the charge rate.

-d

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2000\12\04@103607 by Andrew Kunz

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Astro 11xD - Based on PIC16C71 and has LOTS of time in on it.  A friend of mine
designed the firmware for him.

http://www.astroflight.com

Andy

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2000\12\06@064534 by Mark Skeels

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For 12 volts, 5 amps, and 6 to 8 cells, you'll most likely need some kind of
boost converter. More, I cannot tell you, as our business is to make NiCd
chargers for R/C race cars and such. But, you could check out the BenchMarq
bq2004. Also, Circuit Cellar has a pretty good article on their web site
right now about battery chargers.

Peak Detect is easy; just watch the voltage and store the highest
periodically. Then compare the voltage readings as they come in to the
charger. If the voltage is greater, then store it as the new highest
reading. If lower, then watch the difference. When it exceeds the peak
detect point, stop the charge. You will most likely have to do some
conditioning or averaging on the voltage input in order to escape noise
problems.

Mark

{Original Message removed}

2000\12\06@112734 by Dan Larson

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Maxim deserves a plug here, owing to my gratitude for the samples they sent me..

The MAX712/713, which I will be using in my robot, is a NiCd/NiMH fast charge
controller which will do just what you wish.  It can be run in two modes: linear
or switching.  In the switching mode it can operate from an input voltage less
than the max battery voltage, using a buck-boost configuration.

The number of cells is programmable from 1-16. The fast charge current
is controlled by the current sense resistor. It also has a programmable timeout
period and logic compatible status ouputs.

I will be using the linear mode, because I want to be able to run my load while
charging. If the robot will ever rechage itself, it needs to keep its CPU running
while charging. It doesn't appear that the same can be done in switching mode.
Yes, my robot will have several PICs in it.

The MAX712 terminates fast charge with zero slope detection. The MAX713 uses
a negative slope detection method, otherwise they are the same.

There, now I have earned my samples. <GRIN>

Dan


On Mon, 4 Dec 2000 08:32:55 -0600, Mark Skeels wrote:

{Quote hidden}

>{Original Message removed}

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