I hereby confirm that this project and dissertation entitled “Wireless Mobile Charger” has been carried out by the following students under my direct supervision and that this work has been carried out by them in the laboratories of the Department of Electrical Engineering and Electronics of the Faculty of Engineering of Daffodil International University in partial fulfillment of the requirements for the degree of Bachelor of Science in Electrical and Electronic Engineering. The project and thesis entitled “Wireless Mobile Charger”, submitted by Sayedul Islam Tohin, ID No and Ahosan Habin, ID No Session: Fall 2018, have been accepted as satisfactory in partial fulfillment of the requirements for the degree of Bachelor of Science in Electrical and Electronic Engineering in December 2018. First and foremost, I thank God Almighty for His continuous guidance throughout my academic work until the completion of this project.
The psychological and financial support and encouragement of my family contributed greatly to the achievement of this project and I am very grateful to them. My appreciation goes to all my lecturers, laboratory technologists in the Department of Electrical and Electronic Engineering at Daffodil International University who have influenced knowledge in me and provided me with help. In this concept we used two circuits, one transmitter and other receiver circuits, the transmitter circuit is AC to the DC correction circuit and then it is controlled by pulse width modular circuits.
Foreshine Mutation The secondary coil is connected to the primary coil in the transmitter, from Acid to DC Bridge Circuit, and is used to connect the charger pin to the mobile port.
INTRODUCTION
- Introduction
- Problem Statement
- Objectives
- METHODOLOGY
- Discuss the introduction related to Wireless Power Transfer Systems. The problem statement, the purpose and the project are remarkably brief and clear
- Discusses the literature review on wireless power transfer systems. History of wireless power transfer
- In this chapter the theory behind the design of the project is given
- This chapter gives a detailed explanation on how the device once assembled operates. It also explains the components used and their role in the design of each part of the
- This chapter, the results obtained are explained and discussed. The modifications that were carried out are also explained in this section
- This chapter gives the conclusion and recommendations after completion of the final year project. It covers assessment of whether project objectives and scope were achieved, a
The difference is that wireless power transfer charging is more orderly and manageable, it also makes the user more comfortable to use the smartphone without charging using wires. Then, the power of wireless power transfer can be effective from the components used in the coil. It will make people use gadget for better life. In this project, a test can be used for analytical and proven wireless power transfer and to obtain wireless power transfer capability.
2. To develop and study the system and to examine it to determine its effectiveness. The operating principles of the wireless power transfer system are similar to the surface-based wireless power transfer system used for communication between swarms of robots.
LITERATURE REVIEWS
- Introduction
- History of Wireless Power Transmission
- Basic Principles of Wireless Power Transfer
- Justification for the Study
- Main concepts of wireless transmission of electric energy
- A summary of the main WPT Interface Standards and Alliances as of January 2015
- Summary of the chapter
Tesla was unable to produce a commercial product outside of his research, but his resonant modern machine is now widely used in electronics and is currently being implemented in low-range wireless power systems. Tesla thought that he would enable similar electricity with a similar capacitive antenna to the current power anywhere with little electricity in any part of the world. Modern power transmission was among the earliest wire cables, the first wireless power technology was developed, the transformer became available in the 19th century after it was developed.
Recently, the proliferation of portable wireless communication devices such as cell phones, tablets, and laptops has developed mid-range wireless power and charging technology to eliminate the requirements of connecting these devices to wall plugs during charging. The Quive Inductive Power Standard, released on August 24th, makes it possible to charge and power portable devices with high efficiency up to 5 watts over the distance of 4 cm (1.6 in). During World War I, the development of microwave technology, such as closton and magnetron tubes and parabolic antennas, created the radiation (far-field) method for the first time, and the first long-distance wireless power transmission was by William C.
Most of the wireless power transfer systems use some electromagnetic (EM) fields that are sent for power. There are three types of wireless power transfer that can be used in wireless power transfer, which are radiation transfer, inductive coupling and resonant coupling. The area of adjacent field can be said to be found in the radius of the wavelength, where the fields are located outside the radius of two wavelengths.
Both near-field transfer and far-field are further categorized based on the mode of operation of the transfer. Finally, the radiation flows through the tuner and the directional coupler, which separates the signal according to the direction of signal transmission. It is dedicated to critical review of technical and academic literature on previous work on Wireless Power Transfer (WPT). In this chapter, we discussed the history of wireless power transmission, main concepts of wireless transmission of electrical energy, basic principles of wireless power transmission, and the rationale for the study.
THEORETICAL MODEL
- Introduction
- Wireless transfer by Inductive Coupling
- Advantages of Wireless Charger
- Safe for human, simple implementation
- Charging multiple devices simultaneously with multiple capacities, high charging skills
- It improves user-friendliness as the hassle from connecting cables is removed. Different models of different brands and devices can use the same charger
- It provides better product durability (e.g., waterproof and dustproof) for contact-free devices
- Disadvantages of wireless Charger
- One of the reasons that wireless charging has not been fully integrated is that it can still be slower and less efficient than a traditional charger. It is important to mention that this factor is
- Summary of the chapter
Where R is the full displacement vector from the current source to the field point, Idl. The magnitude of the magnetic field is affected by r, which is the distance from the field point to the center of the coil. Where N is the number of coil rotations, I is the current of the transmitter current, it is a radius TX quilts are the separation distance between D and TXX.
An electromotive force (emf) will be induced in RX coil. Which is obtained by applying Faraday's law of induction which states that "The induced emf ε in a coil is proportional to the negative of the rate of change of magnetic flux". Where L is self-inductance of the coil, M is mutual inductance of two coils, I is the current of the coil. So the emf induced in the coil is directly proportional to the mutual inductance of the coils and rate at which the current oscillates.
The overall efficiency of the system therefore depends only on transmission frequency, mutation, coils' parasitic resistances and load resistance. The Q factor which is defined as the proportional proportion of the resistive coil energy is output and determines the overall efficiency of the system. Where L is the inductance of the coil, R is its resistance and is the operating frequency of the system.
Where k is the coupling factor between two coils, Q1 and Q2 are the quality factors of the transmitter and receiver coils. Charging your battery can be a good solution. It can charge your battery at a faster rate, depending on the size of the battery pack. One of the reasons wireless charging isn't fully integrated is that it can still be slower and less efficient than a traditional charger.
HARDWARE DEVELOPMENT
- Introduction
- General Principle of Design
- Components
- Hardware
- It does not require a center tap on secondary winding, so the AC voltage can be fed directly into the bridge circuit
- For its construction, the crystal diode can be used. Diodes are easily available Market and cheap circuits are more compact
- Transformer use high power
- Summary
Our project is made of a DC power source, an oscillator circuit, in the transmitter module (Commonly known as an electrode) and a transmitter coil. The transformer moves the voltage to a desired level and the rectifier circuit AC voltage is DC. When the power is applied, the DC flows through the current between the two coils of the coil and the drain of the transistor.
Application of load secondary (source coil), defined by the coil, capacitor value and the addition of lower amounts, run in the Oscillator frequency. Known formula for operating frequency resonance, . The transmitter circuit section has two power MOSFETs which are biased using resistors R1, R2, R3, R4. There is also a choke consisting of inductors L1 & L2.L2. The 8 capacitors C work as resonant capacitors to ensure that the coils are at resonant frequencies. In the same moment, both the transistors are shown voltage in the gate terminal and try to turn on transistors.
Either transistor will be faster than the other and it will turn on first. When the receiver coil is placed in the field region from the transmitter coil, the transmitter expands the magnetic field into the coil and generates it, which induces an AC voltage current. The voltage on the revised voltage regulator is supplied and the voltage is controlled and constant.
If the capacitor exceeds the AC cycle, the voltage will be maintained during this gap. The bridge rectifier has 80% efficiency, so the rectified output was less than the input. It is worth noting that the current in the load flows in the same direction for both AC cycles. It also explains the components used and their role in the design of each part of the device. In this we knew about components required for this project.
RESULTS AND DISCUSSIONS
- Results
- Step up DC supply. Using a boost converter, the DC voltage is raised to 30V DC
- Develop transmitters and receiver coils. Electromagnetic induction occurs between two coils and an emf generated on the TX coil that induces a current on the RX coil.The coils were
- Design receiver module and rectify the AC voltage found in receiver coil.DC power output needed a correction that would be used for power Element
- Analysis and Discussion
- Summary
- Conclusions
- The processor was based on the wireless charging theory through the introduction coupling used in the project, it can be seen that the various aspects such as distance, resonance frequency,
- Due to small ranges or closest field from prototype, WPT is 5 cm away Which shifted significantly began to drop
- It can also be concluded that WPT can be used in other applications. We are in the project was able to charge a 9V battery from the power that was transmitted wirelessly
- Limitations of the Work
- Future Scopes of the Work
Design the receiver module and correct the AC voltage in the receiver coil. The DC output needed a correction that would be used for the power element. To test whether current was being sent, we first sold an LED in the receiving coil. This proves that this is actually the distance separation that determines the current introduced into the receiving coil.
This is why it has been discovered that the voltage is fed to a short-circuit current until it grows very slowly. It is also noted that as long as the voltage has been increased to the oscillator, the power is much higher. The battery charging circuit strength obtained on the load coil was not enough. The CD 4066 became a good one as an alternative, it consumed less current and was less bulky than the single channel relay. One of the challenges of modern chargers is to complete the charge once; There is nothing like that fee closed user message To solve this; A buzzer is used when charging is complete and it is listened to.
However, this means that the input signal is output at the same frequency as the refrigerator and it consumes more energy. It is noted that this had no significant effect on the power transmitted. However, when there was a magnetic element in Coils, it was an effect to place inside.
The processor was based on the theory of wireless charging with lead-in coupling used in the project, it can be seen that various aspects such as distance, resonant frequency are used in the project, it can be seen that various aspects such as distance, resonant frequency, quality factor ; to determine the WPT efficiency of the coil turns ratio. 2. From the analysis, it can be seen that at a distance of 0 centimeters, the most efficient power transfer occurred from the test illumination brightness. In the project, we were able to charge a 9V battery from energy transmitted wirelessly.
