CONTENTS INTRODUCTION HISTORY OF WIRELESS POWER PRINCIPLE BEHIND WITRICITY HOW WITRICITY TECHNOLOGY WORKS FIRST MOVER AND INNOVATOR MIT’S EXPERIMENT WITRICITY - MAGNETIC INDUCTION WITRICITY VS RADIATIVE POWER TRANSFER FEATURES APPLICATIONS PROS & CONS CONCLUSION REFERENCES
INTRODUCTION WITRICITY Wire less electricity The technique of transmitting power without using wires with an efficiency up to 95% with non-radiative methods.The Transmission of electrical energy from one object to another without wires.
History of Wireless Power: In 1899, Sir Nikola Tesla Proposed a method of Wireless Power Transmission. As it was a Radiative mode, most of the Power was wasted and has less efficiency. The efficient midrangepower transfer concept isWitricity. In this modelsource and load are inMagnetic resonance sothere is no power loss.
PRINCIPLE BEHIND WITRICITYIt is based on the simple physics principle that “Energy can betransferred wirelessly by utilizing magnetically coupledresonance”.Strong coupling between electromagnetic resonant objectscauses transferring of energy wirelessly between them.
Resonant coupling occurs when natural frequencies of twoobjects are approximately same. It involves a pair of coppercoils for the energy transmission
How it would look and work in your office or bedroom
Nikola Tesla (1856 - 1943) “Nikola Tesla, the eccentric - and unbelievably under- rated - genius known as the ‘wild man of electronics’, was without doubt one of the greatest minds in the history of the human race.” He investigated radio transmission and reception and designed his own transmitter Used this same coupled-tuned-circuit oscillator to implement his non- radiative conduction-based wireless energy transfer. Later it was forwarded by MIT SCIENTISTS
MIT’S EXPERIMENT In 2006,5 members team of researchers of MIT experimentally demonstrated transfer electricity with out wires They were able to lit a 60W bulb ,from a source placed 7 feet away with absolutely no physical contact between the bulb and the power. The team also demonstrated how the magnetic near field can transfer power though
Many wireless information broadcasting uses radiation of radio frequency energy. It is an inefficient means of power transfer because the vast majority of radiated power is wasted into free space. Witricity technology for power transfer is non-radiative & relies on near field magnetic coupling.
FEATURES Highly Resonant Strong Coupling Provides High Efficiency Over Distance.Flexible geometry for being embedded. Highly secure on exposure to Human.Line of sight rule need not to be followed.
EFFICIENCYThe efficiency of such system depends upon : Relative size of the power source and the capture device. Distance between the devices. As common building and furnishing materials are essentially “transparent ”to magnetic fields they enable witricity technology to efficiently transfer power through them. The power not absorbed by the capture device comes back to the power source and gets absorbed by it.
Pros Cons•Significant decluttering of office •Need for standardization andspace. adaptation.•No need for meter rooms and •Retrofitting old equipment orelectrical closets. purchasing new equipment could become a very expensive•Reduction of e-waste by endeavor.eliminating the need for powercords. •Possibility of “energy theft”. Wi Fi, someone can be using your•Need more light , no need for internet or your power.electrician. Simply place the lampwherever needed.
ADVANTAGES 1. No need of line of sight in witricity power transmission 2. Less costly - The components of transmitter and receivers are cheaper. So this system is less costly.DISADVANTAGES 1. Wireless power transmission can be possible only in few meters. 2. Efficiency is only about 40%.
CONCLUSION We can envisage a future in which the world of wireless arrives with witricity. Witricity corp. is working to make this future a reality, developing wireless electricity technology that will operate safely and efficiently over long distances ranging from m to km and will deliver power ranging from mW to kW.
References1. An article published in the Science Magazine as “Wireless Power Transfer via Strongly Coupled Magnetic Resonances” by Andre kurs, Science 317, 83(2007); Dol:10.1126/ science.1143254.2. H. Haus , “Waves and Fields in Optoelectronics”, Prentice hall Publishers, Englewood3. http://electron9.phys.utk.edu/optics507/modules/m6/coupled_resonators.htm4. “Efficient Non-Radiative Midrange Energy Transfer” by Aristeidies karalis, Marlin Soljacics.5. James O. McSpadden, “ Wireless Power Transmission Demonstration”, Texas A&M University, June, 1997.6. http://www.designnews.com/blog/I_Have_The_Power_/929MIT_Team_Invents_WiTricity_ Wireless_Energy_Transfer.php7. http://news.bbc.co.uk/2/hi/technology/6129460.stm