Introduction

1. Wireless Power Through Inductive Coupling Peter Woods, Abner Molina, Minh Nguyen, Dr. J.-C. Chiao Electrical Engineering Summer REU: Sensors, The University of Texas at Arlington, Arlington, Texas 76019 Current Applications - Inductive Recharging - Transportation - Wireless Recharging Purse Future Applications - Elimination of cords for charging - Completely standardized Safety According to an article by Witricity, “There is NO established evidence showing that human exposure to radio frequency (RF) electromagnetic fields causes cancer, but that there is established evidence showing that RF electromagnetic fields may increase a person’s body temperature or may heat body tissues and stimulate nerve and muscle tissues.” Abstract This summer Abner and I worked on wireless power transfer research . Included in this poster is a general overview of wireless power, while Abner’s poster is about the specific research that was done this summer. Topics covered in this poster are, a brief history of wireless power, how it works, applications of wireless power that are currently available as well possible future applications, and a short segment on the safety of wireless power. How It Works 1. There are two coils, a transmitting coil and a receiving coil. 2. An alternating current is induced in the transmitting coil. 3. This alternating current causes a changing magnetic field. 4. The changing magnetic field caused by the transmitting coil induces an electromotive force (EMF) in the receiving coil which causes a current to flow. Important Terms Faraday’s Law- Any change in the magnetic environment of a coil of wire will cause an electromotive force to be induced in the coil. Coupling Factor- When a transmitter coil and receiver coil are separated by a distance , only a portion of the magnetic field sent from the transmitting coil penetrates the receiver coil and induces an EMF in the receiving coil . Coupling factor is a measurement of how much of the magnetic field from the transmitter coil penetrates the receiver coil. Quality Factor of Coils – Quality factor is the ratio of inductance to resistance. The higher the quality factor the higher the efficiency. Efficiency- Wireless Power efficiency is the ratio of output power over input power. Receiving Coil Transmitting Coil Introduction Wireless power has been around since the late 1800s and has seen many advancements in the last decade. Today wireless power can be found in medical implants, toothbrushes, charging pads for cellphones and laptops, transportation systems, and even purses. However, even with the recent breakthroughs in wireless power it is still far from perfect. Research still needs to be done on optimizing efficiency as well as creating wireless power standards. Summary Wireless power is not a new technology, it is older than the internal combustion engine!! There are many products available today that use wireless power. Finally, there is no evidence that wireless power is dangerous. • Brief History • In 1893 Nikola Tesla demonstrated wireless power by illuminating light bulbs at the World’s Columbian Exposition in Chicago. Acknowledgements I’d like to thank Dr. Chiao for guiding me through this research and Dr. KambizAlavi, Dr. Jonathan W. Bredow, and Mr. Mohammadreza Jahangir Moghadam for providing me with the opportunity to be here during summer 2013. I’d also like to thank the National Science Foundation for funding this program (NSF grant # EEC-1156801, REU Site: Research Experiences for Undergraduates in Sensors and Applications). For Further Information Please contact Peter Woods at Peter.Woods@mavs.uta.edu More information on this project and related projects can be obtained at http://www.uta.edu/faculty/jcchiao/research_front.htm