Emergency lights are very useful electrical gadgets and are quite popular, too. During a power failure these portable lights are able to instantly illuminate through battery back up and never allow us to stumble in the darkness. Although you will find a variety of them in different shapes and sizes in the market, but building your own emergency light at home can be a totally different experience. It will not only help you to create a quality design but also will acquaint you to the technical aspects of the unit. Besides, you also get an opportunity to customize the circuit as per your own needs.
My previous design of an LED emergency rechargeable light, though very consistent, unfortunately, is not a plug-in type and also the charging facility is a bit primitive.
Due to the repeated requests from the folks I designed the present circuit, which hopefully should fulfill most of the required demands.
The idea of the present emergency light circuit is truly compact, highly advanced, and may be kept plugged into the mains socket for a permanent automatic operation. The use of a Li-Ion battery makes it infinitely long lasting.
Remember, since the proposed circuit is not isolated from AC mains, is extremely dangerous when connected to the supply line in an uncovered position (box unscrewed), maintain extreme caution while testing or handling.
Let’s try to understand its circuit description.