Design And Construction Of A Custom Winded Transformer Based Variable 0-50 Vdc Power Supply With Digital Display

ABSTRACT

This project work is on design of a custom transformer based variable power supply with digital display. A variable power supply supplies different level of electric energy to an electrical load. The primary function of a variable power supply is to supply different electrical energy to loads that fall at the same rating limit.

The transformer is one of the most common devices in our electrical system for power supply, and transformers are in use across a wide variety of practical applications wherever there is a need to convert alternating current from one voltage level to another.

Transformers can either increase (“step up”) or decrease (“step down”) the voltage and current levels of their supply, without modifying its frequency, or the amount of electrical power being transferred from one winding to another via a magnetic circuit. Custom transformers allow you to do this at any input and output voltage you have a need for, at all different levels of amp. Custom transformer was used in this work to supply variable power to the system

 CHAPTER ONE

1.0                                                        INTRODUCTION

1.1                                           BACKGROUND OF THE STUDY

A power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads.

Every power supply must obtain the energy it supplies to its load, as well as any energy it consumes while performing that task, from an energy source. Depending on its design, a power supply may obtain energy from various types of energy sources, including electrical energy transmission systems, energy storage devices such as a batteries and fuel cells, electromechanical systems such as generators and alternators, solar power converters, or another power supply.

All power supplies have a power input, which receives energy from the energy source, and a power output that delivers energy to the load. In most power supplies the power input and output consist of electrical connectors or hardwired circuit connections, though some power supplies employ wireless energy transfer in lieu of galvanic connections for the power input or output. Some power supplies have other types of inputs and outputs as well, for functions such as external monitoring and control.

The transformer is one of the most common devices in used in building a variable power supply, and transformers are in use across a wide variety of practical applications wherever there is a need to convert alternating current from one voltage level to another. When building a power supply, a standard transformer or custom winded transformer can be used. Custom transformers was used in this work. It allows one to use any input and output voltage you have a need for, at all different levels of amp.

This work is aimed at building a custom transformer based variable power supply with digital display.

1.2                                                  PROBLEM STATEMENT

Using standard transformer for a power supply is always difficult to achieve complex input and output and consumes much energy. Custom made transformers are uniquely designed to relevant dimensions, physical constraints, and terminations. Therefore, they offer more effective solutions than a standard transformer that may not fit well.  Custom made transformers provide the reliability, quality, and efficiency that most industrial applications require

• AIM AND OBJECTIVE OF THE PROJECT

The aim of this study is to build a variable power supply with custom transformer and LCD display. The objectives are:

1. Design new custom power transformers
2. Create prototype transformers

• Build new transformers to meet your exact specifications

1.3                                           LIMITATION OF THE PROJECT

This device is limited at producing 0 – 50 v output using a custom transformer and LCD display.

1.4                                         SIGNIFICANCE OF THE PROJECT

This work makes it possible for someone to use one power supply to run different devices of higher or lower voltage rating without considering buying a new or different power supply.

1.5                                          APPLICATION OF THE PROJECT

A variable power supply is a regulator that electricians and electrical project hobbyists use to test the capacity of voltage for any project they may have completed. Variable power supply with custom transformers for a wide range of industries, including audio, medical, industrial, power and signal applications, and more

1.7     PROJECT ORGANISATION

The work is organized as follows: chapter one discuses the introductory part of the work,   chapter two presents the literature review of the study,  chapter three describes the methods applied,  chapter four discusses the results of the work, chapter five summarizes the research outcomes and the recommendations.