3 Cell Lithium Ion Battery Charger Circuit

The shown current controlled li ion battery charger circuit illustrates a low drop out linear li ion battery charger design which is capable of charging a single 3 7v li ion cell.

3 cell lithium ion battery charger circuit.

The circuit is powered at 5v through a micro usb connector. Circuit diagram and explanation. This circuit has two main parts one is the battery charging circuit and the second is dc to dc boost converter part. It is a tiny module with all the components mentioned in the above circuit diagram.

At the heart of the circuit is one microchip mcp73831 available in sot 23 5 package. Hi friends today in this video i have shown 3 7v lithium battery charger circuit very easy if you have enjoyed this video then pleas like share comment and. It s a simple circuit that will effectively charge your li ion batteries. Tp4056 li ion battery charger module.

The following image shows the module used in this project. Under usb power the lithium ion battery charges. The circuit is designed using a microchip mcp73831 2 ic. Based on the tp4056 lithium ion battery charger controller ic and the above shown circuit diagram several li ion battery charger modules are developed.

See if this link helps. Using the current setup i was able to set the limits from 7 08v to 9v. For enabling low voltage detection the switches j1 and j2 may be appropriately selected the ic starts the charging process by first detecting the voltage of the cell. When the usb is powered the fet q1 is turned off and current flows to the lithium ion charger ic and to the 3 3v regulator mcp1603.

Contain 3 leds and that will indicating power on off charging indicator and full charging indicator. The 10 k preset positioned at pin3 of the opamp is used for setting the over charge level for a 3 7 v li polymer battery this may be set such that the output of the opamp goes high as soon as the battery is charged to 4 2 v for a single cell. The circuit diagram for 18650 lithium battery charger booster module is given above. I have to confess that i m faced with the same problem and feel changing r2 to 1k might be the.

Lithium ion battery charger circuit. To charge a 3 7v cell you might have to change the value of r2. The circuit presented here is a usb powered lithium ion charger combined in a backup powered supply. The booster part is used to boost the battery voltage from 3 7v to 4 5v 6v.

3 7 v li ion battery charger circuit using lm358.