Li Ion Battery Charger | Electronic Project Circuits

Posts Tagged ‘li ion battery charger’

Lithium Ion – Lithium Poly Charger by LM317

The above circuit will charge any 2-cell * Li-Ion battery pack. Maximum current is about 650 milliamps. The circuit is designed for batteries of 900mah or higher. Note this circuit is NOT for Li-Metal batts (i.e. Duralites). Power source can be a 12v Gell cell (Power panel), or can be powered by a car’s cigarette lighter. I use an old 12v DC wall transformer (800ma or more.) Radio shack sells a 12v/1amp wall DC adapter #273-1776 that will work. Supply does not need to be regulated. In fact my cheap supply outputs 17 volts with no load.
Read More Source:http://www.shdesigns.org/lionchg.html

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Categories: Battery charger Tags: li ion battery charger, lithium battery, LM317

Simple Lithium-ion – Lipo Battery Charger

This is a Lithium-ion charger for lipo batteries. Circuit schematic shows configuration for charging single 3.7V lipo battery but voltage can be set to charge several batteries in series. Lipo charger sets a current limit with the LM317, and 1 resistor, and the voltage limit with the TL431, and 2 resistors. 1K resistor is needed to let the TL431 decrease the LM317 current, and to provide the necessary current to the TL431. The optional Schottky diode at the output will prevent current flowing back from battery to the charger circuit when power is disconnected, and reverse biasing of the LM317. Power supply with more than 3V above output voltage is required.

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