Hello.
I have one 7.4v LiPo battery and i would want that when it gets to 6.6v some kind of switch to cut off the current automaticly.
The obvious answer would be, i know ,a schottky diode, but i can t find them for my value.
What should i use for solving my problem?
I thank you for reading
a schottky diode? how would that help? Shottky diodes are very cheap, too - like, 20-for-$1.29-shipped cheap - so i find it hard to belive that they're out of your price range. Did you mean something else?
A micro-power comparator driving a p-MOSFET would be one way, but you'll find there are
chips dedicated to "battery management" out there which might be simpler to use. The
comparator approach would need a reference like a zener to compare to a voltage-divided
version of the battery voltage. Some hysteresis would be needed to stop it oscillating.
A low battery cut-off circuit.
The battery must be connected to some load.
If that's Arduino controlled, then the Arduino can measure the battery and cut the load.
Maybe it's wise to monitor each cell, so that it cuts off when ONE cell is below e.g. 3volts.
Post project and code if you want detailed help.
Leo..
Protection Circuit Modules (PCB / PCM) For Lithium Ion Batteries like MarkT and Wawa mentioned.
Thanks guys!! This is exactly what i need
raschemmel:
FYI, in case you have no experience with 7.4V LIPO, that's called a "2S" battery and 7.4V is the DISCHARGED VOLTAGE. The CHARGED voltage is 8.4V !
7.4V is the nominal voltage -- not the discharged voltage. Either that or the link you re-provided is a deficient product.
Also, your overuse of bold and capitalized letters makes your post look like a Zippy the Pinhead comic.