Led Emergency Light Circuit With Battery Overcharge Protection

The article describes an led emergency light circuit with advanced features such as over charge battery cut off day time auto disable and need less to say that the circuit switches on the leds automatically when ac mains fails and reverts to charging mode when power is restored.

Led emergency light circuit with battery overcharge protection.

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. When the circuit is powered the voltage across base and emitter should be around 0v. The circuit charges the battery as far as it has a voltage below the threshold limit. Below is a lead acid battery charger circuit found in very similar form all over the web.

A further modified version is also available where under voltage cut off protection is provided for the led emergency light circuit. So i took the lamp for checking repairing. Since this circuit diagram does not have battery overcharging protection it is advisable to connect a 13v zener diode across battery terminals. You can find the circuit here.

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. A 12v 7 2ah battery can be used to light up to 100 leds. This is manifested by the light emitting diode led which turned on when the battery is fully charged. 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. All current ratings and voltage ratings are perfectly calculated with basic and clear instructions. The circuit controls the charging of the battery by taking feedback of the voltage across the battery terminals. One part is the led lamp light circuit and the other is the battery charger circuit.

Light led strip etc when input power is removed. Powerful cheap circuit led 716 led light schematic emergency led light circuit schematic simple project working operation. This led emergency light circuit can be divided into two parts. Here you can see the whole story in images.

Automatic led emergency light with under voltage cut off protection. Over charging is taken care and protected by t1. With this circuit over night the battery will get charged fully. Diy led actually someone bring me a dp 716 emergency led lights lamp.

Here the circuit for a 6v automatic battery charger circuit with overcharge protection led charging indicator and current limiting feature.