In the construction work, an ordinary level knowledge of electronics principles are observed. We aimed at presenting a practical aspect of the subject and then providing the argument necessary for a thorough understanding. The reliability of the specimen was estimated after construction and testing to ensure steady state stability. The work is organized into five chapters.

Chapter one introduced the subject matter. Chapter two explores the literature review of the related works. Chapter three contains a detailed account of the design work while chapter four closely attempted an analysis of the design work. Chapter five draws the curtain by concluding the work.

TABLE OF CONTENT

Tile page

Approval page

Certification page

Dedication

Acknowledgement

Abstract

Table of content

CHAPTER ONE

1.0 Introduction

1.1 Aims/Objectives of the project

1.2 Significance of the study

1.3 Methodology

CHAPTER TWO

2.1 A review of Automatic Phase Selector

2.2 Power Supply Unit

2.3 The Transformer

2.4 The Rectifier

2.5 The Filter

2.6 The Voltage Regulator

2.7 Power Circuit

2.8 The Relays

CHAPTER THREE

3.0 The Design Proper

3.1 The Power Supply

3.2 The Step down Block

3.3 The Rectifier Block

3.4 The smoothening Block

3.5 The Regulator

3.6 The Current Sink

CHAPTER FOUR

4.0 Design Analysis

4.1 The Rectifier Circuit

4.2 The Filter Circuit

4.3 Design Calculation

4.4 The DC Voltage Regulator

4.5 The Voltage Programmable Voltage Sink

CHAPTER FIVE

5.0 Discussion of Result

5.1 Conclusion

5.2 Recommendation

References

CHAPTER ONE

INTRODUCTION

As the growing population of human race widens the gulf between energy supply and energy demand, the imbalance in energy availability sent researchers into excavating for a way of settling this age long squabble. A lasting solution is vested on alternative use of the renewable energy source, a project that is yet to be widely applied. Hence, the continuation of the unsettled yearn for sufficient power. Consequently, the power lines are frequently over loaded resulting to a trip of power by the action of switch gears or by the load shading process undertaken by the distribution authorities.

Since it is crystal clear that some institutions such as health related institutions and some other delicate systems should not be allowed to suffer equally with their counterparts, Automatic Phase Selector is used to sustain energy consumption in the time of phase trip. The design of this circuit involves the use of automatic switches but the details of