TABLE OF CONTENTS

Certification –         –         –         –         –         –         –         –         –         i

Dedication   –         –         –         –         –         –         –         –         –         ii

Acknowledgements                   –         –         –         –         –         –         iii

Table of Contents  –         –         –         –         –         –         –         –         iv-vv

 CHAPTER ON

1.0 Introduction – –         –         –         –         –         –         –         1-3

CHAPTER TWO

2.0     History of Power supply  –         –         –         –         –         –         4-10

2.1     General classification of Power Supply         —       –         –         10

2.1.1  Functional    –         –         –         –         –         –         –         –         11

2.1.2  Packaging    –         –         –         –         –         –         –         –         11-12

2.1.3  Power Convex Method    –         –         –         –         –         –         12-13

2.2     Type of Power Supply     –         –         –         –         –         –         13-19

2.2.1  DC Power Supply            –         –         –         –         –         –         19

2.2.2  AC Power Supply/Half wave and Full wave  –         –         –         20-24

CHAPTER THREE

3.0     Application of Power Supply    –         –         –         –         –         25

3.1     Computers             –         –         –         –         –         –         –         25

3.2     Electric Vehicles    –                   –         –         –         –         –         25

3.3     Welding       –         –         –         –         –         –         –         –         25

3.4     Aircraft        –         –         –         –         –         –         –         –         25

3.5     Automation  –         –         –         –         –         –         –         –         27

3.6     Materials for Fabricating Power Supply System      –         –         27

3.6.1  Supplies       –         –         –         –         –         –         –         –         27-30

3.6.2  Loads –         –         –         –         –         –         –         –         –         30-32

3.6.3  Conductors  –         –         –         –         –         –         –         –         32-34

2.6.4  Capacitors and Resistors  –         –         –         –         –         –         34-35

2.6.5  Power Supplies      –         –         –         –         –         –         –         36-38

2.6.6  Protective     –         –         –         –         –         –         –         –         38-42

CHAPTER FOUR

SUMMARY AND CONCLUSION

4.1     Summary     –         –         –         –         –         –         –         –         43

4.2     Conclusion  –         –         –         –         –         –         –         –         43

References

CHAPTER ONE

1.0     INTRODUCTION

A power supply is an electrical device that supplies electric power to an electrical load. The primary function of a power supply is to convert electric current from a source to the correct voltage, current, and frequency to power the load. As a result, power supplies are sometimes referred to as electric power converters. Some power supplies are separate standalone pieces of equipment, while others are built into the load appliances that they power. Examples of the latter include power supplies found in desktop computers and consumer electronics devices. Other functions that power supplies may perform include limiting the current drawn by the load to safe levels, shutting off the current in the event of an electrical fault, power conditioning to prevent electronic noise or voltage surges on the input from reaching the load, power-factor correction, and storing energy so it can continue to power the load in the event of a temporary interruption in the source power (uninterruptible power supply).

All power supplies have a power input connection, which receives energy in the form of electric current from a source, and one or more power output connections that deliver current to the load. The source power may come from the electric power grid, such as an electrical outlet, energy storage devices such as batteries or fuel cells, generators or alternators, solar power converters, or another power supply. The input and output are usually hardwired circuit connections, though some power supplies employ wireless energy transfer to power their loads without wired connections. Some power supplies have other types of inputs and outputs as well, for functions such as external monitoring and control.

Good power supply is as important as the impact of bad power supply on electrical systems appliances and equipment which could results in operational delays, equipment instability and failure.

Power supply result in downtime. If your colleagues are unable to work, this means loss of profile. It could also result in the service which will result in them shopping elsewhere. This demonstrates the important of good power supply. Poor power supply also result in higher power supply. Poor power quality also result in  higher energy cost due to the inefficient use of power.