#18650batterycharger
#lithiumbattery
#batterycharger
#3.7v_battery_charger
#18650


3.7v battery charger circuit with auto cut off
3.7v battery charger circuit diagram
3.7 volt battery charger automatic
Automatic 3.7 volt battery charger circuit
18650 battery charger with auto cutoff
3.7v battery full charge indicator
3.7v battery protection circuit

In this video i'm showing how to make 3.7 volt battery charger circuit with auto cut off on Full Charge.
For that i used TL431 Shunt Regulator, it's actually a adjustable zener.
I used mosfet which remains on by supplying small positive voltage using 1k resistor.
And cut off voltage is set at reference pin1 of TL431 by using resistors from both positive & negative.
When voltage in circuit reaches to threshold point TL431 connects negative voltage from pin2 to pin3 so positive voltage at mosfet gate pin becomes zero and Mosfet turns off.


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PART LIST

Irfz44n Mosfet
TL431 Shunt Regulator
2x 4.7k Resistors
1k Resistor
15k Resistor
5.6k Resistor
220 ohms Resistor
Red & Green Led (5mm)
Crocodile clip wires
Battery Holder



Thanks for watching...

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