Wireless Power Transfer via Strongly Coupled Magnetic Resonance

Abu Sadat Md. Sayem , Habiba Afrin

The efficiency of an energy transferring system is the percentage of energy sent which reaches the destination. Sending energy through wires is often more efficient because wires represent a low loss way to confine and guide the energy to where it is needed. Still, generally, wireless energy transfer works very well at short range; and efficient long-distance transfer is possible if the transmitters and receivers are physically large, or if the energy can be formed into a tight beam. A great concern has been voiced in recent years over the extensive use of energy, the limited supply of resources, and the pollution of the environment from the use of present energy conversion systems. Electrical power accounts for much of the energy consumed. Much of this power is wasted during transmission from power plant generators to the consumer. The resistance of the wire used in the electrical grid distribution system causes a loss of 26-30% of the energy generated. This loss implies that our present system of electrical distribution is only 70-74% efficient. There are areas of the World where the need for electrical power exists. Yet there is no method for delivering power. Africa is in need of power to run pumps to tap into the vast resources of water under the Sahara Desert. Rural areas such as those in China require the electrical power necessary to bring them into the 20th Century and to equal standing with Western nations. Wireless power transmission (WPT) can be used for applications where either an instantaneous amount or a continuous delivery of energy is needed, but where conventional wires are unaffordable, inconvenient, expensive, hazardous, unwanted or impossible. The power can be transmitted using microwaves, millimeter waves or lasers. WPT is a technology that can transport power to locations, which are otherwise not possible or impractical to reach.The aim of this work is to identify the difficulties during wireless power transmission (WPT) and to propose suitable model for overcoming these difficulties. The main difficulty of WPT is the short range and low efficiency. Different aspects of strongly coupled magnetic resonance are analysed in this paper. The main parameters of self-resonance coil such as Quality factor, coupling co-efficient and Decay constant are optimised and a theoretical model is proposed. The model is also implemented practically