THE DESIGN AND CONSTRUCTION OF AN UNINTERRUPTED POWER SYSTEM (UPS)

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 â€�“cleanâ€Â� 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. 

Title page

Certification

Dedication

Acknowledgement

Abstract

Table of content

1.0 Introduction

1.1 Project Objective

2.0 Literature Review

3.0 Methodology

3.1 Design Analysis

3.2 Circuit Diagram

3.3 Block Diagram

3.4 Trickle Charging

3.5 Automatic Function

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

5.0 Construction, Testing/System Evaluation

5.1 Packaging

5.2 Maintenance

6.0 Conclusion/Recommendation

6.1 Costing