Design And Construction Of Digital Power Supply
ABSTRACT
These days, majority of electronic devices work on DC power source, so there was a requirement of a reliable and customized power supply. Generally, the requirements are not too varied, but still they require every time a new hardware designing. The idea presented here is to build a digital controlled power supply [1] that is flexible enough to meet different requirements, with minor software changes and no corresponding hardware change. The aim of this work is to build a digital power supply that has programmable output voltage and current. It is able to recognize faults and take corrective actions to prevent any permanent damage to the system. The system discussed here is capable of functioning independently by its own without any intervention from the user.
TABLE OF CONTENTS
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWELDGEMENT
ABSTRCT
TABLE OF CONTENT
CHAPTER ONE
- INTRODUCTION
- AIM/OBJECTIVE OF THE PROJECT
- SIGNIFICANCE OF THE PROJECT
- ADVANTAGES OF THE PROJECT
- LIMITATION OF THE PROJECT
- APPLICATION OF THE PROJECT
- PROJECT ORGANISATION
CHAPTER TWO
LITERATURE REVIEW
2.0 LITERATURE REVIEW
2.1 REVIEW OF POWER SUPPLY
2.2 REVIEW OF POWER SUPPLY CHARACTERISTICS
2.3 REVIEW OF GENERAL APPLICATION OF POWER SUPPLY APPLICATIONS
2.4 REVIEW OF TYPES OF POWER SUPPLY
CHAPTER THREE
3.0 CONSTRUCTION METHODOLOGY
3.1 BLOCK DIAGRAM OF THE SYSTEM
3.2 BLOCK DIAGRAM DESCRIPTION
3.3 CIRCUIT DIAGRAM
3.4 CIRCUIT DESCRIPTION
3.5 SOFTWARE USED
3.6 HARDWARE USED
3.7 SYSTEM OPERATION
3.8 CIRCUIT DESCRIPTION
3.9 DESCRIPTION OF MAJOR COMPONENTS USED
CHAPTER FOUR
4.0 RESULT ANALYSIS
4.1 CONSTRUCTION PROCEDURE AND TESTING
4.2 ASSEMBLING OF SECTIONS
4.3 CONSRUCTION OF THE CASING
4.4 TESTING
4.5 INSTALLATION OF THE COMPLETED DESIGN
CHAPTER FIVE
- CONCLUSIONS
- RECOMMENDATION
- REFERENCES
CHAPTER ONE
1.1 INTRODUCTION
Power supply 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. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.
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.
To obtain a complete circuit for this work, the circuit is mainly composed of the:
- Input transformer: The input transformer is used to transform the incoming line voltage down to the required level for the power supply. Typically the input transformer provides a step down function. It also isolates the output circuit from the line supply.
- Rectifier: The power supply rectifier converts the incoming signal from an AC format into raw DC. Either half wave or more commonly full wave rectifiers may be used as they make use of both halves of the incoming AC signal.
- Smoothing: The raw DC from the rectifier is far from constant falling to zero when the AC waveform crossed the zero axis, and then rising to its peak. The addition of a reservoir capacitor here fills in the troughs in the waveform, enabling the next stage of the power supply to operate. Large value capacitors are normally used within this stage.
- Regulator: This stage of the power supply takes the smoothed voltage and uses a regulator circuit to provide a constant output virtually regardless of the output current and any minor fluctuations in the input level.
DISPLAY: this power supply is unique in that it has the ability to display the actual measured values for voltage and current and also display shows the pre-set limits for voltage and current.
1.2 AIM OF THE PROJECT
The aim of this work is to build a dc power supply that displays its output voltage and current digitally.
1.3 OBJECTIVE OF THE PROJECT
The objective of this project is to develop a power conversion system suitable for supplying power to dc loads with a displayable output.
1.4 APPLICATION OF THE PROJECT
- This device is used in powering of electronics appliances such as radio, DVD.
- It is used in Solar energy system
- It is used in vehicles
- It is used in transmitters
- Electronics labs
1.5 SIGNIFICANCE OF THE PROJECT
- The output voltages and current can be read through the LCD without using multi-meter or voltmeter
- A good, reliable and easy to use bench power supply unit is probably the most important and most used device in every electronic lab.
- The display shows the pre-set limits for voltage and current.
- Only standard components are used (no special chips).
1.6 LIMITATION OF THE PROJECT
- It is mainly design for 12v power supply.
- When loaded with a load more than the output voltage can damage the device.
1.7 PROJECT WORK ORGANISATION
The various stages involved in the development of this project have been properly put into five chapters to enhance comprehensive and concise reading. In this project thesis, the project is organized sequentially as follows:
Chapter one of this work is on the introduction to a digital power supply. In this chapter, the background, significance, objective limitation and problem ac-dc power supply were discussed.
Chapter two is on literature review of a digital power supply. In this chapter, all the literature pertaining to this work was reviewed.
Chapter three is on design methodology. In this chapter all the method involved during the design and construction were discussed.
Chapter four is on testing analysis. All testing that result accurate functionality was analyzed.
Chapter five is on conclusion, recommendation and references.
The Title Page should be the first section of your project “Design And Construction Of Digital Power Supply”, providing essential details like the project title, your name, your supervisor’s name, the institution, and the submission date. After that, the Abstract offers a brief summary of your project, touching on its purpose, methods, results, and conclusions in 150-300 words. The Acknowledgments section is where you can thank those who supported your research, such as your supervisor, peers, or organizations that provided resources.
Next, the Table of Contents organizes the Design And Construction Of Digital Power Supply by listing its chapters and sections, along with page numbers for easy reference. The List of Figures and List of Tables help guide readers to specific visual elements like graphs, charts, or tables included in the document. There should also be an Abbreviations and Glossary section to explain any specialized terms or acronyms, making the content clearer to readers unfamiliar with the technical language.
The main body of the Design And Construction Of Digital Power Supply should start with the Introduction, which provides background information, outlines the research problem, states your objectives, and gives a brief overview of your research methods. Following that, the Literature Review offers an in-depth look at previous research relevant to your project, identifying gaps your study aims to address. The Methodology section then explains the research design, tools, and data collection methods you used to conduct the project and analyze the data.
In the Results and Discussion section, you present your findings and discuss them in relation to the Design And Construction Of Digital Power Supply research questions or objectives, often using tables or charts to help explain the data. The Conclusion summarizes the key results, discusses their implications, and suggests possible directions for future research. You may also include recommendations based on your findings, offering practical advice for improvements or applications. Finally, the Design And Construction Of Digital Power Supply project should include a References or Bibliography section to list all the sources you cited, as well as Appendices for any additional material. A Statement of Originality is often included to confirm the authenticity of your work