- #1
BillyBobjoe
- 9
- 0
Hi All
i am thinking of using an LM317 to deliver a constant current (CC) of aprox 1A to li-ion batteries for charging. but as you may know it is then recommended to then apply a constant voltage (CV) once the constant current section has made the battery voltage 4.2V per cell. the constant voltage should be 4.2V and shoud terminate when the charge current has dropped to approx 0.1C.
my question is how do i switch from constant current to constant voltage at the required time. is it just a matter of switching of the CC circuit and turning on a CV circuit? I.E can i have two separate circuits one for CC and the other for CV and just turn them on and off as required. Or do they have to be incorporated within the one circuit and if so how?
Thanks
i am thinking of using an LM317 to deliver a constant current (CC) of aprox 1A to li-ion batteries for charging. but as you may know it is then recommended to then apply a constant voltage (CV) once the constant current section has made the battery voltage 4.2V per cell. the constant voltage should be 4.2V and shoud terminate when the charge current has dropped to approx 0.1C.
my question is how do i switch from constant current to constant voltage at the required time. is it just a matter of switching of the CC circuit and turning on a CV circuit? I.E can i have two separate circuits one for CC and the other for CV and just turn them on and off as required. Or do they have to be incorporated within the one circuit and if so how?
Thanks