You typically use a schottky diode that can handle the current with a
low voltage drop to keep current from flowing in an unintended
direction. It isn't immediately obvious how your batteries could go flat
with the charger connected and the system running, but an ammeter can
help you determine how much current is going where in the various
scenarios. Maybe the charger is being tricked into turning off? Hard to
guess.
-Pete
On 2/18/20 1:10 PM, Charles West via TriEmbed wrote:
Hello!
I'm still working on my robot project and I'm starting to make
tentative steps toward something other people could actually use.
There are a few open problems remaining, but there is one in
particular I was wondering if you guys might have any ideas for.
How do you make a LIPO battery system that acts like your laptop? In
particular, how can you make it so you can run your system off of
adaptor power when it is plugged in/charge the battery and then
automatically switch to battery power when the adaptor power is removed?
I've tried in the past just leaving my system plugged in while the
battery was charging with an external charger. The result was dead
LIPOs.
The typical LIPO pack has 2 thick wires coming out with all of the
cells (3 or 4 in my case) in series and a smaller JST connector which
exposes each of the cells in parallel. My first thought is that you
could have your adaptor voltage higher than the battery series voltage
and use one or more reverse current protection circuits to make the
battery stop discharging in that case and apply power to the charger.
Does that make sense as an approach?
They also have battery management ICs (such as the Maxim line) which
include charging, but I'm not sure if they can handle the level of
current that the motors could draw. What do you guys think?
Thanks,
Charlie
_______________________________________________
Triangle, NC Embedded Computing mailing list
To post message: [email protected]
List info: http://mail.triembed.org/mailman/listinfo/triembed_triembed.org
TriEmbed web site: http://TriEmbed.org
To unsubscribe, click link and send a blank message:
mailto:[email protected]?subject=unsubscribe
_______________________________________________
Triangle, NC Embedded Computing mailing list
To post message: [email protected]
List info: http://mail.triembed.org/mailman/listinfo/triembed_triembed.org
TriEmbed web site: http://TriEmbed.org
To unsubscribe, click link and send a blank message:
mailto:[email protected]?subject=unsubscribe
