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This is to certify that the research work,"design and construction of a wireless mobile charger using inductive coupling"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.

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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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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. Wireless 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. The aim of this work is to design a device that can charge cellphone wirelessly. 

CHAPTER ONE
1.0                                                        INTRODUCTION
1.1                                              Background of the project
Increasing reliance on mobile devices such as smartphones, tablets and smart devices has led to an increased demand for efficient and convenient charging solutions. Conventional charging systems, while effective, have limitations such as requiring physical connection, restricting mobility, and damaging the cable. To solve these problems, wireless charging technology, which provides freedom of power transfer without energy, has emerged as a promising solution. One of the wireless charging technologies is inductive coupling, which uses electromagnetic fields to transfer power between the charging pad and the mobile device. Inductive coupling is based on the principle of electromagnetic induction, in which alternating current in a transmitting coil induces a direct current in a closed receiver coil.
The method use in charging portable devices such as cellphone wirelessly is known as inductive charging. 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 [1].
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 [2].
An alternating current in the transmitter coil generates a magnetic field which induces a voltage in the receiver coil. It is the simplest method of wireless power transfer the power can be transmitted. [2] The efficiency of the power transfer depends on the coupling between the inductors and their quality. [3] The example of inductive coupling is the transformer. In transformers, there is a core which guides and acts as a path for the flux from primary to secondary.
Wireless electricity acts as Coreless transformer (Air-cored). The three sections were designed and constructed in this research. The first section was the charged controller. The second section was the transmitter and the third was the receiver. In order to portable, battery was used as power supply source which supplies the whole system to operate. The battery was charged by two methods: one was from solar and another was from AC source. The operation of charging battery was performed by charged controller circuit. Wireless charging eliminates the cable typically required to charge mobile phones, cordless appliances and so on. With a wireless charger, the battery inside any battery-powered appliance can be charged by simply placing the appliance close to a wireless power transmitter or a designated charging station. Wireless charging is the well-known Faraday’s law of induced voltage, commonly used in motors and transformers. This thesis is about a device to transfer power wirelessly instead of using conventional copper cables and wires. Wireless power charging is becoming more and more common in new gadgets like smarts phones, tablets and laptops.

                Problem statement

The traditional method of charging phones involves much wires, exposes the charger and the user to different types of risks. The invention of wireless charger brought solution to problem seen in the wired mobile charger and introduces the following advantages.

• 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

1.3                                       Aim and objectives of the project
Aim
The aim of this project is to build a wireless power transmission mobile charger circuit using inductive coupling is to charge a low power devices.
Objectives
The objectives of the study are:

• To build the system prototype
• To eliminate the need of constantly plug and unplug the device
• To reduce the risk of electric shock.  

1.4       Justification of the study

The invention of the wireless mobile charger will serve as a means of eliminating the use of wired charger thereby eliminating all the disadvantages attached to the wired charger. Wireless Power Transfer system completely reduces existing high- tension power transmission cables, substations and towers between the consumers and generating station. Wireless Power Transfer system completely reduces the cost of the distribution and transmission become less. The cost of the electrical energy to the consumers also reduces. The power could be transmitted to places to which the wired transmission is not possible.

1.5                                         SIGNIFICANCE OF THE PROJECT

This work will serve as a means of increasing the use of wireless charger and also make them reliable and efficient for large distance respectively.
The study will serve as a means of making an environmental and user friendly as the wires and mechanical connectors and related infrastructure are not required.
This study was carried out to overcome the problem seen in the Wired charging infrastructure such as space required is more, socket are different types, a small substation required.
To the student involved, this study will serve as a means of becoming familiar with inductor winding, oscillating circuit and wireless transmission
To the engineering profession, this study will serve as means of understanding the full knowledge of wireless transmission using inductor.

 Scope and Limitation of project

The scope of this study covers the building of a wireless charger using inductive coupling which is one of the effective ways to transfer power between points without the use of conventional wire system. Wireless power transmission is carried out between two inductive coils (transmitter coil and receiver coil). As the current through an inductor is what generate the electromagnetic field, this is what drove both coils. The frequency required to drive the MOSFET is produced from the oscillating circuit by using pulse width modulation (PWM). The MOSFET serves as the switching device to occur the electromagnetic radiation from the transmitter coil synchronously. The combination of the number of turns and the diameter determined the inductance.

Structure of the Project

This section will discuss the layout of the report; the chapters are;
Chapter 2 will look at literature review of the study

• Chapter 3 this involve adopting engineering methodology, then implement the methodology of the study
• Chapter 4 this section will discuss test result, all measurement and analysis will be carrying out of the study
• Chapter 5 will state the conclusion, project appraisal, and recommendation.

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CHAPTER TWO: The chapter one of this work has been displayed above. The complete chapter two of"design and construction of a wireless mobile charger using inductive coupling"is also available. Order full work to download. Chapter two of"design and construction of a wireless mobile charger using inductive coupling"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 wireless mobile charger using inductive coupling"is available. Order full work to download. Chapter three of"design and construction of a wireless mobile charger using inductive coupling"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 wireless mobile charger using inductive coupling"is available. Order full work to download. Chapter four of"design and construction of a wireless mobile charger using inductive coupling"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 wireless mobile charger using inductive coupling"is available. Order full work to download. Chapter five of"design and construction of a wireless mobile charger using inductive coupling"consist of conclusion, recommendation and references.

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