automatic emergency ligh and transformer less power supply-minor project
DESCRIPTION
This Is presentation on minor project for transformerless power supplied automatic emergency light.This very basic circuit and may be taken as starter project to understand concepts and many positive improvemnts can be done on this circuit.Two parts of this project are transformerless power supply and automated light.If you have further Ideas to improve any part of this circuit in any way suggestion are always welcome.Thank you :)TRANSCRIPT
Presentati on on Minor Project‘Automatic Emergency Light’
Sanghvi Institute of Management & Science
ELECTRONICS & COMMUNICATION
By:-Prashant Patil Sanuj Bhatnagar
This is an automatic emergency light without transformer.
Light weight. It turns ‘ON’ as soon as mains cut off. It starts charging its battery as soon as
mains power restores.
Introduction
Initial Circuit Diagram
Circuit from EFY
The output of bridge rectifier was high voltage of around 96V.
Problem in Initial Ckt.
Modified Circuit Diagram
Capacitors C1 and C2 limit the current to a safe value.
Resistor R2 limits the initial surge current and resistor R1 assists in discharging the capacitors after switch off.
Capacitor C3 is the filter capacitor. Zener Diode for 5.1V Transistor T1 is used as switch.
Function of the Circuit Elements
Can be used in villages or area of frequently power cutoff.
In decorative lights. In street lights. In study lamps. In night lamps. Use to provide lighting in mines. In any automated lightning system.
Applications
Increase the working voltage from 5v to 9v, 12v or any desirable voltage with increase in battery potential
Use of Ni-Zn battery instead of Ni-Cd battery which is environmental friendly.
Future Improvements
This circuit can be Improved to use solar energy and automated switching of street lights.
Future Improvements
Thank You