Led Emergency Light Circuit With Battery Overcharge Protection Pdf

Before the use of this circuit you need to adjust the cut off voltage range for autocut.

Led emergency light circuit with battery overcharge protection pdf.

Below is a lead acid battery charger circuit found in very similar form all over the web. This adjustment is done by the 10k preset and a multimeter connected with the output terminals that goes to battery. Light led strip etc when input power is removed. This is manifested by the light emitting diode led which turned on when the battery is fully charged.

The design objectives were accomplished because the lantern can successfully provide a relatively good illumination for over three hours and the battery over charge protection circuit prevents the battery from being over charged. Automatic led emergency lamp circuit with overcharge protection for 12v lead acid battery. With this circuit over night the battery will get charged fully. One part is the led lamp light circuit and the other is the battery charger circuit.

All current ratings and voltage ratings are perfectly calculated with basic and clear instructions. First part is used to drop down the 220v ac voltage into 8v regulated dc with the help of transformer and bridge rectifier. A further modified version is also available where under voltage cut off protection is provided for the led emergency light circuit. Some led drivers incorporate a voltage multiplier or voltage booster in the led driver circuit since 1 2 volts is insufficient to power the ultra bright leds.

This led emergency light circuit can be divided into two parts. The post explains an led emergency light circuit with sophisticated capabilities such as over charge battery cut off day time auto disable and need less to say that the circuit switches on the leds instantly when ac mains goes wrong and reverts to charging mode when power is renewed. This 12v battery charger circuit with auto cut provides the automatic cut off facility when the battery get fully charged. Over charging is taken care and protected by t1.

When the circuit is powered the voltage across base and emitter should be around 0v. Now to get started adding solar power to your small electronics projects and use the sun to power your battery powered night lights garden lights and other automated decorations or. And second part consists of relay and rechargeable battery which is used to lighten the leds during power failure. That does not make it good but its easy and cheapish and works reasonably well.

The following led emergency light with battery over charge protection feature circuit was designed by me in response to the request sent by pp. Automatic led emergency light with under voltage cut off protection. You can find the circuit here. Since this circuit diagram does not have battery overcharging protection it is advisable to connect a 13v zener diode across battery terminals.