ABSTRACT
This
uninterruptible power supplies device has the capability of converting from
12volts D.C to 220volts alternating current at the frequency of 50Hz with the
help of a step-up transformer. The main importance of this device is its
ability to ensure absolute continuity of power to the computerized control
system thereby protecting a critical equipment from electrical supply failure.
Ups system achieve this by rectifying the mains supply, using the direct
current to charge the standby battery and to produce a “clean†alternating
current by passing through an inverter and filter system. The output produced
is free of sags of services in the line voltage, frequency variation, spikes
and transients.
TABLE OF CONTENTS
Title page
Certification
Dedication
Acknowledgement
Abstract
Table of content
CHAPTER ONE
1.0
Introduction
1.1
Project Objective
CHAPTER TWO
2.0
Literature Review
CHAPTER THREE
3.0
Methodology
3.1
Design Analysis
3.2
Circuit Diagram
3.3
Block Diagram
3.4
Trickle Charging
3.5
Automatic Function
CHAPTER FOUR
4.0
Principle of Operation
4.1
Modes of Operation of UPS System
4.2
The DC Source
4.3
Automatic Control System
4.4
Transformers
CHAPTER FIVE
5.0
Construction, Testing/System Evaluation
5.1
Packaging
5.2
Maintenance
CHAPTER SIX
6.0
Conclusion/Recommendation
6.1
Costing
6.2
Bibliography
CHAPTER ONE
1.0
INTRODUCTION
A DC-AC
Inverter is basically a device which converts direct to a sinusoidal current.
There are different ways of doing this conversion to achieve better performance
and reliable system.. This system is designed to generate 50Hz sinusoidal and
220volts alternating current and a total power of 200watts to provide power to
sensitive equipment like computer, communication equipment, and/or to provide
emergency light and power to some essential household appliances when there is
power failure in the house. The desire to embark on the project was born out of
the knowledge of the problem and discomfort that Nigerians faced when there is
power failure in their homes or offices.
Even with generating sets, the user
load will not pick-up power instantly when the failure occurs and where
sensitive equipments like biomedical equipment and telecommunication equipment,
where a momentary loss of power could result in equipment breakdown or data
loss which could cause more labour to recreate (in the case of computer) or
death in hospitals where such equipment were on power supply.
1.1
PROJECT OBJECTIVE
To overcome
some of these shortcomings, a n uninterrupted power supply has been designed
and constructed. This, we realized with rectifiers and inverter with a back-up
power source. One interesting aspect of this system is that the unit is always
in circuit when the supply authority is delivering power. The only requirement
needs is a battery charger, automatic control system, inverter unit, battery
(dc-source) and a step- up transformer. The mains charges the battery where the
supply is ON and in the event of power failure, the load none derives its power
from the battery via an automatic changeover switch.
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