3 Cell Lithium Ion Battery Charger Circuit

Tp4056 li ion battery charger module.

3 cell lithium ion battery charger circuit.

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. See if this link helps. I have to confess that i m faced with the same problem and feel changing r2 to 1k might be the. The circuit diagram for 18650 lithium battery charger booster module is given above.

It is a tiny module with all the components mentioned in the above circuit diagram. The circuit is designed using a microchip mcp73831 2 ic. Here is a tried and tested sample circuit of a li ion battery charger that can be used to charge any 3 7v li ion battery using a 5vdc usb solar panel power supply. 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.

This circuit is for a 2 cell li ion battery pack and successfully charged my 7 4v battery. This circuit has two main parts one is the battery charging circuit and the second is dc to dc boost converter part. The circuit presented here is a usb powered lithium ion charger combined in a backup powered supply. This post is about a tested sample circuit of a lithium ion battery charger that can be used to charge any 3 7v 500ma li ion battery using a 5v dc usb solar panel dc adapter power supply.

Under usb power the lithium ion battery charges. The circuit is powered at 5v through a micro usb connector. Using the current setup i was able to set the limits from 7 08v to 9v. 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.

The booster part is used to boost the battery voltage from 3 7v to 4 5v 6v. At the heart of the circuit is one microchip mcp73831 available in sot 23 5 package. Based on the tp4056 lithium ion battery charger controller ic and the above shown circuit diagram several li ion battery charger modules are developed. 3 7 v li ion battery charger circuit using lm358.

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. Circuit diagram and explanation. It s a simple circuit that will effectively charge your li ion batteries. The following image shows the module used in this project.

Lithium ion battery charger circuit.