Re: charging 10 cell nimh pack 6 cells at a time?
- From: "acannell@xxxxxxx" <acannell@xxxxxxx>
- Date: Mon, 17 Nov 2008 13:06:43 -0800 (PST)
On Nov 17, 12:37 pm, PeterD <pet...@xxxxxxxxxx> wrote:
On Mon, 17 Nov 2008 11:41:51 -0800 (PST), "acann...@xxxxxxx"
<acann...@xxxxxxx> wrote:
On Nov 17, 11:21 am, Richard Henry <pomer...@xxxxxxxxxxx> wrote:
On Nov 17, 9:50 am, "acann...@xxxxxxx" <acann...@xxxxxxx> wrote:
I need to charge a 10 cell nimh pack, but my input voltage is only
12VDC. I dont want to use a switching power supply.
I'm thinking that if I charge the 10 cells in two banks, i.e., 5 at a
time, and I switch between the banks very quickly (100 times per
second say), that I will be able to charge the entire 10 cells okay.
And since I am switching between the packs so quickly I could still
use dt/dt termination (change in temperature rise) since its a
relatively slow phenomenon and switching between packs is essentially
like using a pulsed-current charge method which is pretty standard.
Anyone ever do this? Comments?
Use a switching power supply.
Whats the point of you even responding? I'm NOT going to use a
switching power supply. Thats the whole point of the post.
Haven't you people ever heard of experimenting for experimentings
sake? How did any of you learn electronics with your boring can't-do,
shouldn't-try, attitudes?
Well you could...
Oh, wait you don't want the best solution, only one that you've
already determined is what you want.
Sure you can do it that way.
But WHY? Design your charger to charge the first five cells then the
other five, why 'high speed' switch between the two banks. Do one
bank, then the other.- Hide quoted text -
- Show quoted text -
I understand there might be a better way to do things, but I _want_ to
do it this way to see if it can be done! Plus it could be a lot
cheaper than a switching version.
Because this pack will be used in a device that needs to be available
at any time, and if someone decides to stop the charge at some random
point during the charge cycle, you end up with a battery pack where
half the cells are dead and the other half are partially charged. So
switching between them at a relatively high speed ensures the cells
all get a roughly equal amount of charge per unit time. (human time
anyway)
All you need is a 555 timer switching the current source between the
banks 60 times a second or so.
.
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