DESIGN AND CONSTRUCTION OF A 1.3V TO 15V VARIABLE POWER ADAPTER WITH A SEVEN SEGMENT DISPLAY
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This is to certify that the research work,"design and construction of a 1.3v to 15v variable power adapter with a seven segment display"by ---, Reg. No. --/H2007/01430 submitted in partial fulfillment of the requirement award of a Higher National Diploma on --- has been approved.
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DEDICATION
This project is dedicated to Almighty God for his protection, kindness, strength over my life throughout the period and also to my --- for his financial support and moral care towards me.Also to my mentor --- for her academic advice she often gives to me. May Almighty God shield them from the peril of this world and bless their entire endeavour Amen.
ACKNOWLEDGEMENT
The successful completion of this project work could not have been a reality without the encouragement of my --- and other people. My immensely appreciation goes to my humble and able supervisor mr. --- for his kindness in supervising this project.
My warmest gratitude goes to my parents for their moral, spiritual and financial support throughout my study in this institution.
My appreciation goes to some of my lecturers among whom are Mr. ---, and Dr. ---. I also recognize the support of some of the staff of --- among whom are: The General Manager, Deputy General manager, the internal Auditor Mr. --- and the ---. Finally, my appreciation goes to my elder sister ---, my lovely friends mercy ---, ---, --- and many others who were quite helpful.
PROJECT DESCRIPTION: This work "design and construction of a 1.3v to 15v variable power adapter with a seven segment display" research material is a complete and well researched project material strictly for academic purposes, which has been approved by different Lecturers from different higher institutions. We made Preliminary pages, Abstract and Chapter one of"design and construction of a 1.3v to 15v variable power adapter with a seven segment display"is to be ordered for. Happy viewing!!!
CHAPTER ONE: INTRODUCTION
1.1 BACKGROUND
In today’s world almost all the appliances used are made up of electronics such as handsets, smart phones, digital cameras, iPods, laptops, e.t.c. With the advancement in science and technology these electronics are built based on minimal optimisation so as to minimise the amount of power consumption.
With the rapid growth of highly developed technology of instant communication, computerization, industrial automation and space exploration, the feats would not have been possible without the advent of electrical /electronic engineering. In electrical and telecommunication engineering field, systems and equipments like amplifiers, satellites, microwave link systems to name but a few depend for their correct operations upon the availability of stable well regulated D.C power supplies. In experimental laboratories, the use of well regulated D.C power supplies becomes inevitable because the result of these experiments depends largely on the quality power supply used. (Amadi, 2010).
The construction of this project will be useful presently and in the future. The main requirement of a well regulated D.C power supply unit are: good regulations, low ripple, low output impedance and strict output short-circuit protection.
Many devices have different range of voltage input and can be owned by a single person, each of these electronic devices will have an adapter which can make a room look clumsy and much heat will be dissipated when using many adapters.
Instead of having an adapter for each device, a single adapter is manufactured to power up each device at different voltage range but it is limited in such a way that it gives only discrete values(e.g. 9V, 12V, 16V, and so on).
1.2 PROBLEM STATEMENT
Nowadays, electrical power supply is the one of important element in human being needs. Most of human activities is very depending on the demand of electrical power supply. In other words, without electrical power supply, almost the whole of activities is become postponed or worse cancelled. Some devices that have input voltages of 1.5V, 3.5V, 7.5V, e.t.c, cannot be powered by such adapter which is aforementioned. There is a need for a variable power adapter which will have continuous range of variable output voltage (say 1.3V to 15V) with a seven segment display that shows the selected output voltage.
1.3 AIM AND OBJECTIVES
AIM
To design a 1.3V to 15V variable power adapter with a seven segment display.
OBJECTIVES
The specific objectives are to;
- Design a power supply.
- Design a regulator unit.
- Design a display unit.
- Develop software that controls the microcontroller (hex file).
- Construction of the whole circuit.
1.4 SCOPE
This adapter accepts voltage from A.C outlet and gives out a range of variable output voltage of 1.3V to 15V at a current of 1A. The working circuit is divided into mainly three sections namely A.C section, regulator section and microcontroller section.
A.C section consists of a fuse, a transformer, a full wave rectifier and voltage smoothing circuit.
The regulator section is a voltage regulator IC (LM317), a potentiometer, post filters and some associated circuitry.
The microcontroller section consists of a PIC16F876microcontroller, seven segment display sub-unit and the software which is embedded on the microcontroller.
1.5 SIGNIFICANCE
This variable adapter plays a very important role in the field of electronics. Scientist and engineers need this kind of adapter to power up most of their devices in the laboratory since most devices in electronics laboratory need direct current (D.C) voltage input and many devices range from different values. This adapter gives a room for the selection of the required voltage value by varying the output with a potentiometer, for it can supply a D.C voltage ranging from 1.3V to 15V. In our houses, schools, offices, we also need such an adapter to charge phones, iPods, digital cameras, smart phones, e.t.c.
CHAPTER FIVE: SUMMARY, CONCLUSION
AND RECOMMENDATION
5.1 SUMMARY
The variable regulated D.C power supply utilizes a 240V A.C supply which is stepped down by a 15V centre tapped transformer. The transformer is connected to a fuse of 3A to protect the transformer and the circuit. The circuit is incorporated with four diodes which forms the bridge rectifier circuit. The capacitors do the smoothening of the voltage which is rectified by the bridge rectifier. After the smoothening, the LM317 voltage regulator takes in the input from its Vin pin, the Vadj pin is connected to a potentiometer in series with a resistor and grounded and the regulated voltage output is on the Vout pin with two protective diodes. The output voltage is fed to a microcontroller which manipulates and displays the output voltage on a seven segment display by the help of a program.
5.2 CONCLUSION
The aim of a project is to make the students adopt the theories into practical realization for the benefits of mankind. The circuit was constructed and tested; the output voltage was varied from 0V to 15V. It is a huge success.
CHAPTER TWO: The chapter one of this work has been displayed above. The complete chapter two of"design and construction of a 1.3v to 15v variable power adapter with a seven segment display"is also available. Order full work to download. Chapter two of"design and construction of a 1.3v to 15v variable power adapter with a seven segment display"consists of the literature review. In this chapter all the related work on"design and construction of an arduino based public address system"was reviewed.
CHAPTER THREE: The complete chapter three of"design and construction of a 1.3v to 15v variable power adapter with a seven segment display"is available. Order full work to download. Chapter three of"design and construction of a 1.3v to 15v variable power adapter with a seven segment display"consists of the methodology. In this chapter all the method used in carrying out this work was discussed.
CHAPTER FOUR: The complete chapter four of"design and construction of a 1.3v to 15v variable power adapter with a seven segment display"is available. Order full work to download. Chapter four of"design and construction of a 1.3v to 15v variable power adapter with a seven segment display"consists of all the test conducted during the work and the result gotten after the whole work
CHAPTER FIVE: The complete chapter five of"design and construction of a 1.3v to 15v variable power adapter with a seven segment display"is available. Order full work to download. Chapter five of"design and construction of a 1.3v to 15v variable power adapter with a seven segment display"consist of conclusion, recommendation and references.
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