3 Cell Lithium Ion Battery Charger Circuit

The circuit is powered at 5v through a micro usb connector.

3 cell lithium ion battery charger circuit.

See if this link helps. 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. 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. To charge a 3 7v cell you might have to change the value of r2.

I have to confess that i m faced with the same problem and feel changing r2 to 1k might be the. This circuit is for a 2 cell li ion battery pack and successfully charged my 7 4v battery. The following image shows the module used in this project. Tp4056 li ion battery charger module.

Using the current setup i was able to set the limits from 7 08v to 9v. Under usb power the lithium ion battery charges. The circuit diagram for 18650 lithium battery charger booster module is given above. 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.

Lithium ion battery charger circuit. 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. 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. Circuit diagram and explanation.

The circuit is designed using a microchip mcp73831 2 ic. This circuit has two main parts one is the battery charging circuit and the second is dc to dc boost converter part. 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.

It is a tiny module with all the components mentioned in the above circuit diagram. Contain 3 leds and that will indicating power on off charging indicator and full charging indicator. 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. 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.