Martin wrote:
> I'm looking for a 10 cell (12v) NiMH charger, assembled board, that 
> takes a plain DC input of whatever value.
>
> Alternately I need a wall-wart pack that does the same thing.
>
> Otherwise I'll be designing a charger using the bq2000t from TI. Has 
> anyone used this chip before?
>
> --
> Martin K
>   
Linear Technology has easier charger devices to work with.

But, I  am now using the MC3021 A/D in I2C and driving a  OPTO-PV device 
/ MOSFET switch.
Works great. I read a 10-bit battery voltage which I measure when the 
pulse is ON as well as
when the pulse is OFF. Since I know the precise value of my raw supply, 
I can measure the
charging current thru the I- resistor as well as its peak voltage. I 
also monitor the battery temperature
thru a second MC3021. This setup works good and costs a fraction of what 
the charger chip costs.

I have a 48-volt system made up of 4 12V packs made from 10 NiMH C-Cells 
each. Delivers a peak
current of 20A at 48V when fully charged. Each pack has its own temp 
sensor inside its package.

During tests yesterday, I can regulate the batteries so that their 
voltage is within 5mV of each other.
I was surprised, frankly...

--Bob
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