ABSTRACT

 Automatic voltage inverter is an important area in power system engineering.  It is the process of using a 12v DC from the battery to achieve a 220/230V AC through the help of oscillator, drivers, power transistors and transformer.  The stages are battery to oscillators, oscillators to drivers, drivers to power transistors then from power transistors to transformer which is capable of giving out 220/230V (1000w) as an output.   A 1.25KVA (1000w) voltage inverter was constructed, tested and certified okay.  Since the inverter as constructed to step-up voltage, the power transformer is used as step-down for charging and as step up transformer for inverting.   This project helps in the improvement of the epileptic power supply we are having in Nigeria and it also reduce the high level of power dependence in Nigeria by serving as IPP’s (Independent Power Plants).  The project as run in school helps in equipping the students in the practical aspect of the course.


TABLE OF CONTENTS

Title page                                                                                                        i

Certification page                                                                                           ii

Dedication                                                                                                      iii

Acknowledgement                                                                                         iv

Abstract                                                                                                          v

Table of content                                                                     vi

CHAPTER ONE

Introduction                                                                           

Analysis (review of existing system)                                           

Aims and objective                                                                

Scope/Limit of the project                                                     

Application                                                                             

CHAPTER TWO

Literature review                                                                           

Introduction                                                                            

Brief review of used components                                        

Capacitor                                                                               

Resistor                                                                                  

Relay                                                                                      

Transistors                                                                             

Diodes                                                                                    

Switches                                                                                 

Operational amplifier                                                             

Transformer                                                                           

A.C. Voltage meter                                                                

Oscillator                                                                                

MOSEFET                                                                                       

CHAPTER THREE

Design and analysis                                                              

Introduction                                                                            

Methodology                                                                          

D.C. Supply (input voltage)                                                   

Voltage regulator                                                                   

Control logical circuit                                                             

Frequency generator                                                            

Phase splitter                                                                         

Driver                                                                                     

Step-up transformer                                                             

A.C. supply (output voltage)                                                 

Methodology II                                                                     

The unregulated supply (input voltage)                               

Isolating relay                                                                       

Step-up transformer/rectifier circuit                                     

Changing control/logic comparator circuit                          

Theory and calculation                                                         

Circuit diagram casing design                                              

CHAPTER FOUR

Constructions test and result                                                

Introduction                                                                          

Problem encountered                                                           

CHAPTER FIVE

Conclusion and recommendations                                        

 Conclusion                                                                            

Recommendations                                                                

References