D
dt
- Jan 1, 1970
- 0
Hi, I need to charge lithium batteries (3 to 12 cell packs) and
prevent individual cells from exceeding the desired voltage (4.2v
each). This is most commonly done in hobby circles using a charger
that takes the overall pack up to the desired total voltage (eg: 12.6v
for 3 cells) and a separate balancer circuit to try to keep each cell
the same.
What I would prefer is a charger than can charge each cell
individually to 4.2v and eliminate the need for the balancer circuit.
Single cell lithium charging chips are readily available, and if I
were to supply each of these from separate 5v mains power supplies I
could daisy chain any number together and achieve my objectives. An
example of what I mean is shown in this post if I'm not clear: http://
www.rcgroups.com/forums/showpost.php?p=6049417&postcount=4
However, I would like to do this from a single 12v car battery source.
So I need a step-down design with up to 12 isolated outputs (~5V
each). I need at least 3A each, preferably more. Does anyone know of a
elegant way of achieving this please?
Thanks, David.
prevent individual cells from exceeding the desired voltage (4.2v
each). This is most commonly done in hobby circles using a charger
that takes the overall pack up to the desired total voltage (eg: 12.6v
for 3 cells) and a separate balancer circuit to try to keep each cell
the same.
What I would prefer is a charger than can charge each cell
individually to 4.2v and eliminate the need for the balancer circuit.
Single cell lithium charging chips are readily available, and if I
were to supply each of these from separate 5v mains power supplies I
could daisy chain any number together and achieve my objectives. An
example of what I mean is shown in this post if I'm not clear: http://
www.rcgroups.com/forums/showpost.php?p=6049417&postcount=4
However, I would like to do this from a single 12v car battery source.
So I need a step-down design with up to 12 isolated outputs (~5V
each). I need at least 3A each, preferably more. Does anyone know of a
elegant way of achieving this please?
Thanks, David.