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TITLE PAGE
BY
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--/H2013/01430
DEPARTMENT OF ----
SCHOOL OF ---
INSTITUTE OF ---
APPROVAL PAGE
This is to certify that the research work, "design and construction of a dc operated electric cooker" by ---, Reg. No. --/H2007/01430 submitted in partial fulfillment of the requirement award of a Higher National Diploma on --- has been approved.
By
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Supervisor Head of Department.
Signature………………. Signature……………….
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External Invigilator
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.
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Ever since early humans discovered how to make fire, people have been eager to cook with it. Over time, cooking techniques have become ever more sophisticated and efficient and more portable and compact. Today, one of the leading and most benefit-rich cooking methods is "induction."
Induction is the fastest-growing cooking technology in Nigeria presently. Induction is a term that refers to a specific method for generating heat. Induction cooking is performed using direct induction heating of cooking vessels, rather than relying on indirect radiation, convection, or thermal conduction. Induction cooking allows high power and very rapid increases in temperature to be achieved, and changes in heat settings are instantaneous. This work is aimed at building an inductive based dc powered cooker.
TABLE OF CONTENTS
COVER PAGE
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWLEDGEMENT
ABSTRACT
CHAPTER ONE
1.0 INTRODUCTION
1.1 BACKGROUND OF STUDY
- PROBLEM STATEMENT
- AIM AND OBJECTIVE OF THE PROJECT
- SCOPE OF THE PROJECT
- SIGNIFICANCE OF THE PROJECT
- BENEFIT OF THE PROJECT
- LIMITATION OF THE PROJECT
CHAPTER TWO
LITERATURE REVIEW
- REVIEW OF THE STUDY
- REVIEW OF THE STUDY
- REVIEW OF DIFFERENT TYPES OF COOKER
- REVIEW OF INDUCTIVE COOKING
- REVIEW OF MICHAEL FARADAY’S LAW OF INDUCTION
- FACTORS TO BE CONSIDERED WHILE DESIGNING INDUCTION COIL SYSTEM
- INDUCTION HEATING FORMULA
- INDUCTION HEATING COIL DESIGN
- APPLICATIONS OF INDUCTIVE COIL
CHAPTER THREE
3.0 METHODOLOGY
3.1 SYSTEM BLOCK DIAGRAM
3.2 SYSTEM DESCRIPTION
3.3 SYSTEM CIRCUIT DIAGRAM
3.4 PARTS LIST
3.5 SYSTEM UNIT DESIGN
CHAPTER FOUR
TEST AND RESULT ANALYSIS
- CONSTRUCTION PROCEDURE
- CASING AND PACKAGING
- ASSEMBLING OF SECTIONS
- TESTING OF SYSTEM OPERATION
- DESIGN LIMITATION
CHAPTER FIVE
5.0 CONCLUSION, RECOMMENDATION AND REFERENCES
- CONCLUSION
- RECOMMENDATION
REFERENCES
CHAPTER ONE
1.0 INTRODUCTION
The work relates to an inverter circuit driving device of an cooker, and more particularly to an inverter circuit of a cooker which is capable of varying the width of a drive pulse to an inverter with a variation in an input voltage so as to vary a switching frequency of the inverter, thereby stabilizing heating power generated by a switching operation of the inverter and preventing an internal device of the inverter from being damaged due to the variation in the input voltage.
The inverter circuit is applied to the cooker to heat an object (load) to be cooked by controlling a power switching device therein. The power switching device performs a switching operation in response to a control signal to apply a drive voltage to the induction coil for the inner pan so as to heat the inner pan. The inverter circuit comprises a power source for supplying a commercial alternating current (AC) voltage, a rectifier for rectifying the AC voltage supplied by the power source, a filter for filtering an output voltage from the rectifier and an inverter for performing a switching operation based on an output voltage from the filter to apply a drive voltage to the coil for the inner pan.
The inverter circuit further comprises a trigger circuit for varying the operation or state of a specific circuit at a rising or falling edge of a pulse. The trigger circuit generates a drive pulse to drive a switch of the inverter. The switch is turned on when the drive pulse goes “high” in level, and off when the drive pulse goes “low” in level. Here, a voltage applied across the switch is referred to as a “switched voltage”.
The inverter circuit further comprises a switch driver for transferring the drive pulse from the trigger circuit to the inverter to drive the switch of the inverter.
The switch of the inverter is adapted to perform the switching operation in response to the drive pulse transferred from the switch driver to generate heating power, which is used as a heating source for cooking a load to be heated (an object to be cooked). A withstand voltage of the switch against the switched voltage is limited in its range according to specifications of the switch. In general terms, the higher the withstand voltage, the higher the cost of the switch, resulting in an increase in production cost.
1.1 AIM OF THE PROJECT
The main aim of this work is to design a circuit that will operate or power a heater using battery or dc source.
1.2 OBJECTIVE OF THE PROJECT
The objective of the work is to design and construct a battery operated electric cooker which is powered by rechargeable battery when there is power outage. In this work, a 12v rechargeable battery is used to power the whole system.
1.3 SIGNIFICANCE OF THE PROJCET
After knowing in detail what a dc operated cooker is and how different useful it is to make appliances work at residential and industrial levels students should also know the advantages.
- Also use of rechargeable battery energy helps in saving money many people.
- This device helps people who use limited amount of electricity.
- A dc operated cooker is more environmentally friendly.
- Also their maintenance does not cost much money.
1.4 LIMITATION OF THE PROJECT
- Initially you need to shell out a lot of money for buying a battery.
- It will work effectively and produce direct current only when the battery is fully charge.
1.5 PURPOSE OF THE PROJECT
The purpose of this circuit is for laboratories and shops for carrying out small scale cooking jobs such as melting ornaments, or boiling small quantity of liquids using battery.
1.6 SCOPE OF THE PROJECT
This device compose of an inverter circuit cooker which is capable of controlling a switching frequency of an inverter in a variable manner according to a variation in an AC voltage to the inverter circuit and performing a switching operation of the inverter at the controlled switching frequency, in order to prevent a switch determining the supply of a drive voltage for the heating cooker from being damaged as well as to heating the cooker, so that a margin of a switched voltage across the switch is increased to enhance durability of a product, no high-cost switch is required to curtail a production cost, and power of the inverter does not vary greatly with variations in a load to be heated and in the AC voltage, thereby enhancing stability and reliability of the inverter circuit.
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 an automatic voltage stabilizer. In this chapter, the background, significance, objective limitation and problem of the study were discussed.
Chapter two is on literature review of the study. 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.
CHAPTER FIVE
5.1 CONCLUSION
This research has been carried out successfully which is on a dc powered cooker. In this project, it is clear that dc powered cooker would be extremely beneficial to society if it is implemented in homes and home electronics.
This cooker has a reality Efficient, Low maintenance cost. But, high initial cost. Better than conventional cooker.
5.2 RECOMMENDATION
The device has been designed, tested and system was able to respond to its operation. This work was built with quality wiring and contains many connections, I recommend that if failure occur, it should be troubleshoot by a qualify personnel along with the circuits diagram.
This project was built for Educational purposes. If one wants to use it for industrial or home applications, I recommend that a hook should be attached to the casing that would allow fixing the system on the wall.
Working on this topic as my project is a good idea and it comes at the right time. I am suggesting that this particular topic should also be given to other students both in higher and lower class.
A capacitor must be connected parallel to the work coil to create a resonant tank circuit. The combination of inductance and capacitance will have a specific resonant frequency at which the control circuit will automatically operate. The coil-capacitor combination used here resonated at around 200kHz.
It is important to use good quality capacitors that can withstand large currents and the heat dissipated within them otherwise they would soon fail and destroy your drive circuit. They must also be placed reasonably close to the work coil and using thick wire or pipe. Most of the current will be flowing between the coil and capacitor so this wire must be thickest. The wires linking to the circuit and power supply can be slightly thinner if desired.
This coil here was made from 2mm diameter brass pipe. It was simple to wind and easy to solder to, but it would soon start to deform due to excess heating. The turns would then touch, shorting out and making it less effective. Since the control circuit stayed relatively cool during use, it seemed that this could be made to work at higher power levels but it would be necessary to use thicker pipe or to water cool it.
CHAPTER TWO: The chapter one of this work has been displayed above. The complete chapter two of "design and construction of a dc operated electric cooker" is also available. Order full work to download. Chapter two of "design and construction of a dc operated electric cooker"consists of the literature review. In this chapter all the related work on "design and construction of a dc operated electric cooker" was reviewed.
CHAPTER THREE: The complete chapter three of "design and construction of a dc operated electric cooker" is available. Order full work to download. Chapter three of "design and construction of a dc operated electric cooker" 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 dc operated electric cooker" is available. Order full work to download. Chapter four of "design and construction of a dc operated electric cooker" 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 dc operated electric cooker" is available. Order full work to download. Chapter five of "design and construction of a dc operated electric cooker" consist of conclusion, recommendation and references.
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