Wireless Power Transmission for Mobile and Wheel Chair Charging of Physically Challenged People

Abstract
In this project wireless power transfer is used for providing power supply to various loads using a mobile wheel chair. This chair is operated using RF technology. This project integrates two wireless technologies: wireless power transfer and RF technology. The working principle behind wireless power transmission is electromagnetic induction. Wireless power or wireless energy transmission is the transmission of electrical energy from a power source to an electrical load without man-made conductors. Wireless transmission is useful in cases where interconnecting wires are inconvenient, hazardous, or impossible..
Keywords:Wireless Power Transfer; Magnetic Resonance Coupling; Nuclear Waste Management; Multi Barrier System;
I.Introduction
The working principle behind wireless power transmission is electromagnetic induction. Wireless power or wireless energy transmission is the transmission of electrical energy from a power source to an electrical load without manmade conductors. Wireless transmission is useful in cases where interconnecting wires are inconvenient, hazardous, or impossible. With electro dynamic induction, electric current flowing through a primary coil creates a magnetic field that acts on a secondary coil producing a current within it. Coupling must be tight in order to achieve high efficiency. [3] This action of an electrical transformer is the simplest form of wireless power transmission. The primary and secondary circuits of a transformer are not directly connected. Energy transfer takes place through a process known as mutual induction. Principal functions are stepping the primary voltage either up or down and electrical isolation. Mobile phone and electric toothbrush battery chargers, and electrical power distribution transformers are examples of how this principle is used. Induction cookers use this method. The receiver must be directly adjacent to the transmitter or induction unit in order to efficiently couple with it. In this paper, we will report some recent progress on wireless power transfer (WPT) based on resonant coupling.
Two major technologies will be discussed: the use of meta materials and array of coupled resonators. With a slab of meta material, the near-field coupling between two resonant coils can be enhanced; the power transfer efficiency between coils is boosted by the meta material. The principle of enhanced coupling with meta material will be discussed; the design of meta material slabs for near-field wireless power transfer will be shown; recent experimental results on wireless power transfer efficiency improvement with meta material will also be presented. By using an array of resonators, the range of efficient power transfer can be greatly extended. More importantly, this new technology can provide wireless power to both static and mobile devices dynamically. The principle of this technology will be explained; analytical and numerical models will be used to evaluate the performance of a WPT system with an array of resonators; recent experimental developments will also be presented.
ELECTROMAGNETIC FORCE:
An electric current flowing through a conductor, such as a wire, carries electrical energy. When an electric current passes through a circuit there is an electric field in the dielectric surrounding the conductor; magnetic field lines around the conductor and lines of electric force radially about the conductor.