ABSTRACT
This project is titled the construction of a solar cell phone Battery charger. It is designed to meet up with the higher demand of power supply needed to keep our cell phone battery charged. A solar cell phone battery charger is an electrical device that converts the energy of light directly into electricity by the photovoltaic effect. It does this by the use of solar panel which is a form of photoelectric cell (in that its electrical characteristics– e.g. current, voltage, or resistance– vary when light is incident upon it) which, when exposed to light, generates up to 6V 500mA current without being attached to any external voltage source. The potential being generated is passed through a charging circuit to charge the phone battery. This work is aimed at constructing a solar cell phone battery charger system which receives 6V dc and produce 3V – 5V from the solar panel and convert it to the level that can be safe to the cell phone battery. The output from the charging circuit is passed through a voltage regulator to ensure a constant charging current.
TABLE OF CONTENTS PAGES
Title page – – – – – – – – – i
Certification – – – – – – – – ii
Dedication – – – – – – – iii
Acknowledgement – – – – – – – iv
Abstract – – – – – – – – – v
List of symbols – – – – – – – – vi
Table of Contents – – – – – – – vi-viii
CHAPTER ONE
- Introduction – – – – – – – 1-6
1.1 Background of the study – – – – – 1-3
1.2 Motivation of study – – – – – – 4
1.3 Aims and Objective of project – – – – 4-5
1.4 Statement of Problem – – – – – 5
1.5 Scope of Study – – – – – – – 5
1.6 Project Outline – – – – – 6
CHAPTER TWO
2.0 LITERATURE REVIEW – – – – – 7-19
2.1 Solar Cells – – – – – – – 11-13
2.2 Solar battery charger- – – – – – 13-16
2.3 Review of component – – – – – 16
2.3.1Voltage regulator IC – – – – – 16
2.3.2 Capacitor – – – – – – – 16-17
2.3.3 Resistor – – – – – – – – 17
2.3.4 Diode – – – – – – – – 17-18
2.3.5 USB Port – – – – – – – – 18-19
CHAPTER THREE
3.0 CONSTRUCTIONAL PROCEDURES – – 20-28
3.1 Circuit Construction and selection of
Component values – – – – – – 20
3.2 System block diagram – – – – – 21
3.3.1 Transformer (220V/12V) – – – – – 21-22
3.3.2 Rectification – – – – – – – 22-23
3.3.3Rechargeable Battery – – – – – 23-24
3.3.4 Solar Panel – – – – – – – 24-25
3.3.5 Charging circuit – – – – – – 26
3.3.6 Regulator Circuit – – – – – – 26
3.3.7 Control Circuit – – – – – – – 26
3.4 Principles of operation of solar powered
mobile phone charger – – – – – 27-28
CHAPTER FOUR
4.0 DISCUSSION, TESTING AND RESULT – 29-31
4.1 Testing and Result – – – – – – 29
4.2 Casing construction – – – – – – 29-30
4.3 Assembling of constructed work – – – 30
4.4 Safety precaution / maintenance – – – 30-31
CHAPTER FIVE
5.0 CONCLUSION AND RECOMMENDATION – 32-34
5.1 Conclusion – – – – – – – 32
5.2 Recommendation – – – – – – 32
5.3 Engineering Management and Evaluation – – 33
References – – – – – – – 34
CHAPTER ONE
1.0 INTRODUCTION
1.1 BACKGROUND Nigeria as the largest country in Africa with a population of about 148 million is facing the challenge of erratic power supply. This is because not less than 60% of the population has limited or no access to affordable electricity, hence there is need to stem the energy crisis in the nation. Due to the increasing population of Nigeria, there has been a corresponding increase in power demand without a reliable supply to meet such. The short fall in the supply of electricity in this country especially in the rural settlement where there are inadequate or no grid systems necessitates the need to explore renewable source of energy.
