J
John
- Jan 1, 1970
- 0
I'd like to use a 20A CC/CV power supply to charge LiPo cells and want
to terminate the charge when the charging current drops to 25mA-150mA
(selectable).
Sense resistors are out, IMHO, because of the 20A max charging current
(for multiple parallel cells). Any value that can give me a decently
measureable voltage would burn up at 20A. And I can't find any
Hall-Effect sensors (allegor, etc.) that can work down to those
current levels.
I don't need to measure the current, just flip a bit when the current
drops below my 25mA-150mA setpoint. Or, I can monitor a voltage and
just ignore anything over a certain level.
Any recommendations for a part/method that could measure such low
current levels while not burning up when the charge current is as high
as 20A? Anything to +/-10% would be OK, +/-1% would be perfect.
Thanks!
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to terminate the charge when the charging current drops to 25mA-150mA
(selectable).
Sense resistors are out, IMHO, because of the 20A max charging current
(for multiple parallel cells). Any value that can give me a decently
measureable voltage would burn up at 20A. And I can't find any
Hall-Effect sensors (allegor, etc.) that can work down to those
current levels.
I don't need to measure the current, just flip a bit when the current
drops below my 25mA-150mA setpoint. Or, I can monitor a voltage and
just ignore anything over a certain level.
Any recommendations for a part/method that could measure such low
current levels while not burning up when the charge current is as high
as 20A? Anything to +/-10% would be OK, +/-1% would be perfect.
Thanks!
-- remove SPAMMENOT for e-mail responses --