ABSTRACT
As the name of the project implies “Automatic Emergency Light” is an electronic system that can provide light during emergency situations i.e when mains (NEPA) supply fails. This system can provide enough light with full brightness in a given room or office.
The system makes use of white light emitting diodes for the lightings. It is automatic in operation, in the sense that it can switch itself off when the battery charges full.
Automatic Emergency light comprises three sections: Rectifier section, charger section and the LED driver section. The rectifier section comprises the step down transformer and the bridge rectifier using four Diodes (IN4007x4), which converts the AC input to DC output (with some ac ripples). This DC voltage is feed into the charger circuit after filtration. The charger circuit is designed to charge the battery, which will power the LEDs when there is no mains supply. The LEDs driver section consists a number of white LEDs connected in parallel, with 100n resistor in series with each. The LEDs are built around a switching transistor. This sections is the light section.
As said earlier, these LEDs give full liquid to the room or office when NEPA is off.
Automatic Emergency light system should not be confused or misunderstood with an inverter system. The two are not the same. An inverter converts a DC voltage to AC voltage but an Automatic Emergency light does not. Also an invert is used to power other AC loads while this Automatic emergency light is used for lightings which make use of light emitting diodes only. The efficiency of the Automatic emergency light system depends on the potential capacity of the battery.
With this system, when mains supply (NEPA) is off, the Electronics Engineers can say let there be light, and there will be light.
TABLE OF CONTENTS
Title Pagei
Approval Pageii
Dedication iii
Acknowledgement iv
Abstract v
Table of Contentsvii
CHAPTER ONE
1.0Introduction1
1.1Aim3
1.2Scope of Study 3
1.3Limitation 5
CHAPTER TWO
2.0Literature Review 6
2.1Component Used Discuss7
CHAPTER THREE
3.0System Operation20
3.1Block Diagram 20
3.2Circuit Diagrams 24
CHAPTER FOUR
4.0System Construction and System Packaging 25
4.1Prototyping 25
4.2Component Mounting25
4.3Soldering 26
4.4Testing27
4.5Packaging 28
CHAPTER FIVE
5.0System Testing and Result 29
5.1Continuity Testing29
5.2Voltage Testing29
5.3Result30
5.4BEME31
CHAPTER SIX
6.0Conclusion and Recommendation 33
6.1Conclusion33
6.2Recommendation 33
References 35