camerart
Well-Known Member
Hi All,
I would like to build a safe li-ion cell battery pack charger. I have read lots about it, but so far haven't seen a good circuit for charging packs.
I have tried reverse engineering a bought one, but I found feedbacks that I didn't understand, and it charged cells over the 4.2v recommended.
It should be able to charge protected and unprotected cells. (Over/under voltage)
I think the best way might be to charge each cell separately, that is each cell still in it's pack would be charged on it's own 1 then 2 then 3 and so on. There are good chips for accurate charging, so all I need to do is make a switch circuit, that would allow any number of cells (perhaps) I intend to use 4 to 6, 18650 cells.
I will be charging them using a solar pack (I've yet to make) which will have a buck controller for varying solar output. The solar cells will probably produce 5 ish volts boosted to 'say'12V.
Any ideas welcome. Cheers, Camerart.
I would like to build a safe li-ion cell battery pack charger. I have read lots about it, but so far haven't seen a good circuit for charging packs.
I have tried reverse engineering a bought one, but I found feedbacks that I didn't understand, and it charged cells over the 4.2v recommended.
It should be able to charge protected and unprotected cells. (Over/under voltage)
I think the best way might be to charge each cell separately, that is each cell still in it's pack would be charged on it's own 1 then 2 then 3 and so on. There are good chips for accurate charging, so all I need to do is make a switch circuit, that would allow any number of cells (perhaps) I intend to use 4 to 6, 18650 cells.
I will be charging them using a solar pack (I've yet to make) which will have a buck controller for varying solar output. The solar cells will probably produce 5 ish volts boosted to 'say'12V.
Any ideas welcome. Cheers, Camerart.