3.6V Lithium Ion Battery Charging Circuit LM317

LM317 Adjustable positive regulator IC with charge circuit current and voltage as Lithium ion batteries can recharge with the limitation. Charging the battery after the charge is dropped, led with cruise altitudes (2-8but) based on the circuit protected defensively when the battery is not excessive.

LM317 Lithium ion battery charger circuit, author @ta5coz http://forum.kadirlitrac.org/thanks to people who contributed to the shared on the site. The following comments are owned by the author.

Operation Of The Circuit:

R1, R2, and R3 in parallel resistors, the output voltage of 4.2 volts to bring to.

Ra resistance, filling flow. Charging current is about I = 650mV/Ra.

The output current when no time, RA will fall on the BC639 u know the circuit voltage voltage transmission will work as regulatoru.In this condition the output voltage with the appropriate resistors R1, R2, R3 are selected (on line 560 ohm and 15 k,) 4.2 volt a. Once this is over 2.2 ohm 1 watt resistor with an ammeter output short circuit current will be measured. Output short circuit current, Ra = 1 ohm to about 650 mA.

Battery charge current flowing through at the same time, Ra resistance the voltage on the aktığından, Ra, in via BC639 u will spend level (650mV) transmission reaches the No. 1 end of the LM317 (ADJ-setting-) attract the soil and reducing the output voltage will cause the current to flow through the battery and fixed.

As a result, the battery voltage will be fixed until I flow with the 4.2 volts. It means that the battery is full-filling flow reached 4.2 volta increasingly will descend at least value. The trials, it was between this value between 8but 2mA. So when you want to take your battery out, connect and plug it in!

During charging, the Red led will illuminate. Measurements greater than 160 mA charge flows equal to the led, the brightness of light. 100 mA from low charge currents is completely off. The RB resistance 10 ohms when the led current will lower … According to your set.