DESIGN AND CONSTRUCTION OF A SWITCH MODE POWER SUPPLY
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TITLE PAGE
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INSTITUTE OF ---
DECEMBER,2018
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This is to certify that the research work, "design and construction of a switch mode power supply" 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.
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This work is on switched-mode power supply (SMPS) which is an electronic circuit that converts power using switching devices that are turned on and off at high frequencies, and storage components such as inductors or capacitors to supply power when the switching device is in its non-conduction state. The circuit was built around TNY267 switching regulator which performs the functions of the PWM generator, MOSFET chopper switch, error amp, and control circuit.
At end of this work a switching power supplies was built which have high efficiency and durable which is fit to be used in a variety of electronic equipment, including computers and other sensitive equipment requiring stable and efficient power supply.
TABLE OF CONTENTS
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWLEDGEMENT
ABSTRACT
TABLE OF CONTENT
CHAPTER ONE
1.0 INTRODUCTION
1.1 BACKGROUND OF THE STUDY
1.2 PROBLEM STATEMENT
1.3 AIM/OBJECTIVE OF THE PROJECT
1.4 SIGNIFICANCE OF THE PROJECT
1.5 SCOPE OF THE PROJECT
CHAPTER TWO
LITERATURE REVIEW
2.0 LITERATURE REVIEW
2.1 REVIEW 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
2.5 TYPES OF SWITCH MODE POWER SUPPLY
2.6 APPLICATION OF SWITCH MODE POWER SUPPLY
2.7 ADVANTAGES AND DISADVANTAGES OF SWITCH MODE POWER SUPPLY
CHAPTER THREE
3.0 METHODOLOGY
3.1 BLOCK DIAGRAM OF THE SYSTEM
3.2 CIRCUIT DIAGRAM
3.3 CIRCUIT DESCRIPTION
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
5.2 CONCLUSIONS
5.2 RECOMMENDATION
REFERENCES
CHAPTER ONE
1.0 INTRODUCTION
1.1 BACKGROUND OF THE STUDY
A power supply is an essential part of every electronic device. It converts an AC power line voltage to a steady state DC output voltage as required by all electronic circuits. Power supplies can be categorized into two types: linear and Switch Mode.
Linear power consists of a transformer, rectifier, and filtering and regulator circuits. The rectifiers are used to convert 50/60Hz AC voltage to a pulsating DC. The filters are used to convert the pulsating DC to a smooth voltage. Finally, the voltage regulators are used to produce a constant output voltage, irrespective of the variations in the ac line voltage or by the circuit loadings. The output voltage is sampled by an error amplifier block which compares it with a reference signal and generates an error signal on the basis of comparison [3]. The error signal is applied to a series pass element which alters its resistance accordingly and thus regulates the output voltage. Hence, the series pass element absorbs any changes in the input voltage and any dynamic changes in the output voltage due to the load changes, within its designed tolerance band [1]. The size of the components, such as the transformers and output filters, are very bulky in these supplies. Linear power supplies are not suitable for smaller modern electronics system because of their high power loss, low power density and bulky size.
The SMPS converts the available unregulated AC or DC input to a regulated DC output. The input is taken from the AC mains and then rectified, filtered and fed to a high frequency DC-DC converter. SMPS can be operated within the kHz to MHz frequency range. The increased switching frequencies cause a decrease in the size of the energy storage elements, such as the capacitors, inductors and transformers, in an almost linear manner [3].
This work is aimed at building a Switch Mode power supply of 12v,/5amps.
1.2 PROBLEM STATEMENT
Switch Mode power supply was invented to solve problems observed in linear power supply such as low frequency and efficiency. Linear DC regulated power supplies (“linear supplies”) alter the output voltage to the required value through the power frequency (50/60 Hz alternating current) voltage transformer [8]. After being lowered (or raised) to the appropriate AC voltage value, the waveform is rectified, filtered, and stabilized by a voltage regulation circuit, and is then output as a regulated direct current (DC). These types of power supplies have a common characteristic; the voltage transformer works in the linear range [7]. The noise on the input is not amplified on the output. This makes for a quiet and stable output. But, there are drawbacks. The large static loss of the regulating element requires a large heat sink to cool the device and the physical size of a transformer that works in the power line frequencies (50/60 Hz) is large and heavy. Switching power supply was invented which does not operate at normal power line frequencies (50/60 Hz) but rather at considerably higher frequencies (several KHz to several MHz) [13]. In a switching power supply, the regulating device operates in the saturation or cut-off area as opposed to the linear power supply regulator which operates in the less efficient linear range. Switching power supply has Small size, lighter weight, and higher efficiency (can reach nearly 99%). It also have larger output ripple, RFI/EMI interference from pulsed power, higher output voltage if failure occurs [14].
1.3 AIM AND OBJECTIVES OF THE STUDY
This work is aimed at building a Switch Mode power supply of 12v,/5amps. The objectives are:
- To build the system prototype
- To overcome challenges seen in linear power supply
- To increase efficiency of power supply used in electronics.
1.4 SIGNIFICANCE OF THE STUDY
This work shall serve as a means of learning to how to build an efficient and high frequency power supply which can be used to power our appliances.
The study will also serve as an avenue of knowing the difference between linear power supply and Switch Mode power supply.
1.5 SCOPE OF THE STUDY
The scope of this work covers building a Switch Mode power supply incorporates a switching regulator to convert electrical power efficiently. It is mainly used for obtaining a controlled dc power supply as output. It is used to convert power (voltage) using switching devices that are turned on and off alternatively at high frequencies. It uses storage components like inductors or capacitors to supply power when the switching device is in its non-conduction state (off-state). SMPS possesses high efficiency and is widely used in various electronic equipment such as computers, battery chargers, and other sensitive equipment requiring a stable and efficient power supply.
CHAPTER TWO: The chapter one of this work has been displayed above. The complete chapter two of "design and construction of a switch mode power supply" is also available. Order full work to download. Chapter two of "design and construction of a switch mode power supply" consists of the literature review. In this chapter all the related work on "design and construction of a switch mode power supply" was reviewed.
CHAPTER THREE: The complete chapter three of "design and construction of a switch mode power supply" is available. Order full work to download. Chapter three of "design and construction of a switch mode power supply" 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 switch mode power supply" is available. Order full work to download. Chapter four of "design and construction of a switch mode power supply" 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 switch mode power supply" is available. Order full work to download. Chapter five of "design and construction of a switch mode power supply" consist of conclusion, recommendation and references.
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