3.7 V LI-ION Battery Charger

Status
Not open for further replies.
P

panneerrajan

Member level 1
Joined
Jul 9, 2013
Messages
38
Helped
0
Reputation
0
Reaction score
0
Trophy points
6
Location
Trivandrum
Activity points
350
Hi,
I have 3.7V /2100mAh Li-Ion Battery and have 5V/2A DC Adapter. I Need basic charging ciruit. The maximum charging VOLTAGE IS 4.3v
 

Another way to do it is first measure the precise voltage outputted by your '5V' supply.
If around 4.9V better; if about 5.1V, not good.

Connect a selected 0.7V drop Si rectifier to the cell
(+4.9V)-------------|>|-----------------Cell (+)
That will drop voltage to 4.3V for charging. Measure cell voltage during charging, must not exceed the maximum.

Or, use a linear adjustable voltage regulator precisely set at ~4.25V.
 

Your Lithium battery cell will probably explode or catch on fire if you use a Mickey Mouse charging circuit. Use a proper Lithium battery charger IC instead.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…