Led Emergency Light Circuit With Battery Overcharge Protection Pdf

This led emergency light circuit can be divided into two parts.

Led emergency light circuit with battery overcharge protection pdf.

One part is the led lamp light circuit and the other is the battery charger circuit. Automatic led emergency lamp circuit with overcharge protection for 12v lead acid battery. 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.

A further modified version is also available where under voltage cut off protection is provided for the led emergency light circuit. 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. All current ratings and voltage ratings are perfectly calculated with basic and clear instructions. Hope with the above guide line you can make your light work successfully.

The article describes an led emergency light circuit with advanced features such as over charge battery cut off. Automatic led emergency light with under voltage cut off protection. A 12v 7 2ah battery can be used to light up to 100 leds. Light led strip etc when input power is removed.

And second part consists of relay and rechargeable battery which is used to lighten the leds during power failure. Over charging is taken care and protected by t1. First part is used to drop down the 220v ac voltage into 8v regulated dc with the help of transformer and bridge rectifier. Below is a lead acid battery charger circuit found in very similar form all over the web.

You can find the circuit here. This adjustment is done by the 10k preset and a multimeter connected with the output terminals that goes to battery. The following led emergency light with battery over charge protection feature circuit was designed by me in response to the request sent by pp. 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.

That does not make it good but its easy and cheapish and works reasonably well. With this circuit over night the battery will get charged fully. Before the use of this circuit you need to adjust the cut off voltage range for autocut. This is manifested by the light emitting diode led which turned on when the battery is fully charged.