Israel Powermat has developed a wireless power supply, this is called "Power Pad" wireless power can be achieved through the power transmission of electromagnetic waves, thus eliminating the need for connecting the power cord and power outlet of trouble. Polya King said the company's CEO, this works a bit like the power of the RFID tag. RFID readers and tags are usually constituted by the reading device used to form the magnetic field around the antenna, transmitter frequency tuning and reader "tags" to get energy from the magnetic field is converted to electrical signals sent to the following reader. This power supply also has a wireless equivalent of "reader" of the base and an electromagnetic wave into the current "label", but its base is a few millimeters thick mats, may need to determine the size, can be placed on the table , can also be mounted on the kitchen table surface or wall, to carry it through the electromagnetic field "label" the electrical power transmission, as long as with the "label" of the electrical pads placed on or near the pad, you can get electricity.
Bi-directional and Wireless Power Technology for V2G Systems Dr. U. K. Madawala The University of Auckland, New Zealand Depletion of fossil fuel reserves and current practice in generation, transmission, distribution and utilization of energy are major worldwide concerns, for which distributed generation (DG) and harnessing of renewable energy are considered to be partial and acceptable solutions. However, the quality of power delivered by DG systems, especially those based on wind and solar energy, is largely affected by the stochastic nature of their energy production. Consequently, in order to improve the power quality while meeting the demand in the most economical and efficient way, energy suppliers rely on energy storage systems, particularly for DG systems of medium power levels. Amongst various storage solutions such as fly-wheels, batteries, super-capacitors etc, vehicle-to-grid (V2G) concept, which uses hybrid vehicles or pure EVs to store and supply energy back to the grid, is gaining more and more popularity as both hybrid and EVs are considered to be an indispensable component in both ‘living and mobility’ and sustainable living in near future. Irrespective of whether the EV or a fleet of EVs is used solely for medium scale energy storage or micro- scale residential use as in the case of ‘Living and Mobility’, there lies the challenge of charging and retrieval (discharging) of energy. Consequently, techniques for charging and discharging of EVs, with the emphasis on simplicity, low cost, convenience, high efficiency and flexibility, have become the main focus of current research in both industrial and academic community, whose fields of interests are in V2G and sustainable living. Contactless or wireless charging techniques have thus become a viable choice as they meet most of the above attributes. Inductive Power Transfer (IPT) is a technology that has gained global acceptance and popularity as a technique, which is suitable for supplying power to variety of applications with no physical contacts. IPT technology transfers power from one system to another through weak or loose magnetic coupling, and offers the advantages of high efficiency, typically about 85-92%, robustness and high reliability in hostile environments being unaffected by dust or chemicals, which in fact are the key to its popularity. According to literature, many IPT systems with various circuit topologies or compensation strategies and levels of sophistication in control, have been proposed and successfully implemented to cater for a wide range of applications, which range from very low power bio-medical implants to high power battery charging system. The focus of all these reported systems has solely been improvements to the contactless power flow in unidirectional applications. Consequently, they have specifically been designed for uni-directional power flow, and thus are not suitable for applications, such as EVs, V2G systems, regenerative equipment etc, which require bi- directional power flow. This tutorial provides an introduction to IPT Technology with particular emphasis on bi- directional IPT concept, which is suitable for simultaneous contactless charging/discharging and grid integration of multiple EVs used in V2G systems. The tutorial intends to cover material in such a way that participants will gain valuable knowledge in relation to applications, theory and analysis of both unidirectional and bidirectional IPT Systems. http://www.ece.auckland.ac.nz/~umad001/ Dr. Udaya K. Madawala (Senior Member IEEE) graduated with B. Sc. (Electrical Engineering) (Hons) from The University of Moratuwa, Sri Lanka in 1987 and received his PhD (Power Electronics) from The University of Auckland, New Zealand in 1993. He was employed by Fisher & Paykel Ltd, New Zealand as a Research and Development Engineer in 1993, and he joined the Department of Electrical and Computer Engineering at The University of Auckland, New Zealand, as a Research Fellow and worked on energy related various power electronics projects. At present, he is a full-time Senior Lecturer, and serves as an Associate Editor for IEEE Transactions on Industrial Electronics, IEEE Transactions on Power Electronics and International Journal on Industrial Electronics and Motor Drives. He is a member of the Power Electronics Technical Committee and the Chairman of the sub- committee of Power Electronic Converters of the IEEE Industrial Electronic Society, and also the Chairman of the Joint Chapter of IEEE Industrial Electronics and Industrial Applications Society, New Zealand (North). He has more than 100 international publications and 4 patents. His research interests are in the fields of renewable or green energy, power electronics and inductive power transfer, and he works as a consultant to industry in these fields.
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