As power requirements for portable devices increase, consumers are looking for easy-to-use charging solutions that can be deployed in a wide array of environments such as home, office, automobiles, airports, schools and more. Inductive charging uses an electromagnetic field to transfer energy between two objects. This is usually done with a charging station. Energy is sent through an inductive coupling to an electrical device, which can then use that energy to charge batteries or run the device.

TITLE PAGE

APPROVAL PAGE
DEDICATION
ACKNOWELDGEMENT
ABSTRACT
TABLE OF CONTENT

CHAPTER ONE

• INTRODUCTION
• AIM/OBJECTIVE OF THE PROJECT
• PURPOSE OF THE PROJECT
• SIGNIFICANCE OF THE PROJECT
• LIMITATION OF THE PROJECT
• APPLICATION OF THE PROJECT
• BENEFIT OF THE PROJECT
• SCOPE OF THE PROJECT
• PROBLEM OF THE PROJECT
• PROJECT ORGANISATION

CHAPTER TWO

2.0     LITERATURE REVIEW
2.1     LITERATURE REVIEW OF THE STUDY
2.2     HISTORICAL BACKGROUND OF INDUCTION
2.3      REVIEW INDUCTIVE (MAGNETIC) COUPLING
2.4     GENERAL APPLICATION OF AN INDUCTIVE COUPLING
2.5     OVERVIEW OF AN INDUCTOR
2.6     INDUCTOR CONSTRUCTION REVIEW

CHAPTER THREE
3.0     CONSTRUCTION METHODOLOGY
3.1      SYSTEM BLOCK DIAGRAM
3.3      DESCRIPTION OF SYSTEM BLOCK DIAGRAM
3.4      SYSTEM CIRCUIT DIAGRAM
3.4.1  TRANSMITTING CIRCUIT
3.4.2  RECEIVING CIRCUIT
3.5      CIRCUIT OPERATION
3.6      CIRCUIT DESCRIPTION
3.6      DESCRIPTION OF ELECTRONICS COMPONENTS USED

CHAPTER FOUR
RESULT ANALYSIS
4.0      CONSTRUCTION PROCEDURE AND TESTING
4.1      CASING AND PACKAGING
4.2      ASSEMBLING OF SECTIONS
4.3      TESTING OF SYSTEM OPERATION
4.4      COST ANALYSIS

CHAPTER FIVE     
5.0      CONCLUSION
5.1      RECOMMENDATION
5.2      REFERENCES

 

CHAPTER ONE
1.1                                                           INTRUCTION
Inductive charging uses an electromagnetic field to transfer energy between two objects. This is usually done with a charging station. Energy is sent through an inductive coupling to an electrical device, which can then use that energy to charge batteries or run the device.
Induction chargers use an induction coil to create an alternating electromagnetic field from within a charging base, and a second induction coil in the portable device takes power from the electromagnetic field and converts it back into electric current to charge the battery. The two induction coils in proximity combine to form an electrical transformer. Greater distances between sender and receiver coils can be achieved when the inductive charging system uses resonant inductive coupling. Recent improvements to this resonant system include using a movable transmission coil (i.e. mounted on an elevating platform or arm) and the use of other materials for the receiver coil made of silver plated copper or sometimes aluminium to minimize weight and decrease resistance due to the skin effect.
1.2                                             OBJECTIVE OF THE PROJECT
The main objective of this project is to design a charger that uses induction coil to create an alternating electromagnetic field from within a charging base, and a second induction coil in the portable device takes power from the electromagnetic field and converts it back into electric current to charge the battery.

1.3                                         SIGNIFICANCE OF THE PROJECT

• Protected connections – No corrosion when the electronics are all enclosed, away from water or oxygen in the atmosphere. Less risk of electrical faults such as short circuit due to insulation failure, especially where connections are made or broken frequently.
• Low infection risk – For embedded medical devices, transmission of power via a magnetic field passing through the skin avoids the infection risks associated with wires penetrating the skin.
• Durability – Without the need to constantly plug and unplug the device, there is significantly less wear and tear on the socket of the device and the attaching cable.
• Increased convenience and aesthetic quality – No need for cables
• No energy-waste
•  Need for battery is eliminated
• Low Maintenance cost

1.4                                           LIMITATION OF THE PROJECT

• Slower charging – Due to the lower efficiency, devices take much longer to charge when supplied power is the same amount.
• More expensive – Inductive charging also requires drive electronics and coils in both device and charger, increasing the complexity and cost of manufacturing.
• Lost energy turns into heat, and the charger can get quite warm during charging. This causes stress on the device’s battery as it sits on the mat. It should be noted that the heat buildup only occurs during charging; the charging pad cools down once the battery is fully charged.

1.5                                          APPLICATION OF THE PROJECT

• it is used in electric motor charging. The major advantage of the inductive approach for vehicle charging is that there is no possibility of electric shock, as there are no exposed conductors
• it is used in cell phone charging. Inductive charging system for in vehicle use that could charge only specially made cell phones to MP3 players with compatible receivers.
• Consumer electronics
•  Industrial purposes  Harsh environment
•  Far-field energy transfer
• ◦ Solar Power Satellites
• Energy to remote areas

1.6                                              BENEFITS OF THE PROJECT

• Allows for charging of multiple devices. This is achieved by changing the coil geometry, as well as allocating large charging surface areas such as table tops and charging benches.
• High charging speeds: though at the moment wireless charging offers a slower charging rate than the wired option, advances in resonance and induction technology promises an increased charging rate and improved efficiency in the future
• Wireless power transfer allows for greater spatial freedom between the power source and the device. This means that the two do not have to be precisely aligned for power transfer.
• Eliminating charging cords enables engineers to make compact and watertight devices, thus maximizing on safety, and varied use such as in deep-sea applications.
• Prevents corrosion and sparking by eliminating mechanical connectors and wired contacts
• Reduces costs associated with maintaining and replacing mechanical connectors.

1.7                                                 SCOPE OF THE PROJECT
This device is one of the effective ways to transfer power between points without the use of conventional wire system. Wireless power transmission is effective in areas where wire system is unreachable or impossible. The power is transferred using inductive coupling, resonant induction or electromagnetic wave transmission depending on whether its short range, mid-range or high range.
In this project, the wireless power transfer works mainly on the principle of inductive coupling, using inductor at the transmitting and receiving side of the circuits. With this inductive coupling idea, we are trying to transfer power wirelessly to charge low power devices, such as mobile phones, cameras, wireless mouse etc.

1.8                                              PROBLEM OF THE PROJECT
During the construction we faced a challenge; the strength of a magnetic field decreases with distance. The decrease in strength is proportional to the square of the distance from the source. This made it difficult to regulate power and reduced energy efficiency.

1.9                                        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 this study. In this chapter, the background, significance, objective, limitation, application and scope of this study were discussed.
Chapter two is on literature review of this 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.

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