Cover page

Title page I

Approval II

Dedication III

Acknowledgement IV

Abstract V

Table of content VI

List of figures VII

Chapter ONE

1.0 Background of the stud……………………….2

1.1 Statement of problem…………………………..

1.2 Aims and objectives……………………………4

1.3 Scope of work …………………………………4

1.4 Importance of work……………………………..4

1.5 Organization of study …………………………6

Chapter TWO

2.0 Brief History of Inverters………………………8

2.1 Inverter application and uses ………………….8

2.2 Types of inverter ………………………………9

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2.3 Inverter versus other related appliances………………..10

2.3.1 Generator and inverter………………………………….10

2.3.2 Inverter and ups…………………………………………12

2.4 Mode of operation of an inverter……………………….13

2.4.1 When the AC mains supply is available………………..14

2.4.2 When the AC mains supply is not available ……………14

2.5 Component Analysis ……………………………………16

2.5.1 Ideal diodes ………………………………………………16

2.5.2 Resistors…………………………………………………….18

2.5.3 Capacitors………………………………………………..19

2.5.4 Transistors………………………………………………..20

2.5.5 Voltage regulator …………………………………………..22

2.5.6 Transformer …………………………………………….23

2.5.7 Relay…………………………………………………….24

2.5.7.1 Battery………………………………………………..26

Chapter THREE

3.0 Block diagram and operation…………………………….27

3.1 When the AC mains supply is available…………………….27

3.2 When the AC mains supply is unavailable………………….28

3.3 Complete circuit diagram ………………………………..33

3.3.1 System operation using circuit diagram……………..34

Chapter FOUR

4.0 Design specifications and requirements ……………35

4.1 Design of the power supply unit ……………………35

4.2 Design of 50 Hz oscillator…………………………..37

4.3 Days (hours) of autonomy …………………………39

4.4 Depth of discharge……………………………………40

Chapter FIVE

5.0 Drive or amplifier test………………………………..43

5.1 Oscillator circuit test…………………………………43

5.3 Transformer test………………………………………44

5.4 Entire system testing………………………………….44

5.4 Battery charging evaluation ………………………….44

5.5 System evaluation ……………………………………44

5.6 Packaging …………………………………………….45

5.7 Cost of project ……………………………………….46

5.8 Maintenance cost …………………………………….49

5.9 Running cost …………………………………………49

CHAPTER SIX: CONCLUSION

6.0 Conclusion ……………………………………………50

6.1 Recommendation …………………………………….50

6.2 Problem encountered …………………………………51

6.3 Limitation/ Constraints………………………………..51

6.4 Suggestion for further improvement ………………….51

Reference

LIST OF FIGURES

Fig 2.0 Ideal diode structure

Fig 2.1 Symbol of zener diode

Fig 2.2 Symbol of light emitting diode

Fig 2.3 symbol of electrolytic capacitor

Fig 2.4 Paper capacitor

Fig 2.5 Variable capacitor

Fig 2.6 Symbol of enhancement mosfet F

ig 2.7 Symbol of npn transistor

Fig 2.8 Symbol of voltage regulator (7808 Ic)

Fig 2.9 Core type transformer

Fig 2.10 Symbol of a transformer

Fig 3.1 Block diagram of basic inverter

Fig 3.2 Complete circuit diagram of 500 watts/inverter