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# Introduction to Witricity (Wireless power transfer)

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This paper gives an introduction about Witricity technology. Witricity stands for wireless electricity. It uses the principle of mutual inductance for wireless power transfer.
This is an interesting technology and has wide applications.

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### Introduction to Witricity (Wireless power transfer)

1. 1. Wireless Transmission of Power Presented by :Asim Sagheer Anum Khan Sumaira Sagheer WiTricity
2. 2. Contents What is WiTricity Background Working Principle Is it secure ??? Applications Limitations
3. 3. What is WiTricity?  Stands for ‘wireless electricity’  Eliminates the use of cables for transmission of power  Transmission by induction through resonators.  Security
4. 4. (1/2) Background  In 1899, Sir Nikola Tesla enlighten 200 lamps at the distance of 40 km.  But only 15% efficiency was achieved.
5. 5. (2/2)  MIT powered 60 watt light bulb from 2 meters (7 ft) at 40% efficiency  First practical example of WiTricity.
6. 6. (1/1) Working Principle  One Simple Physics Rule !  At Source : Electricity Magnetic Wave  At Device : Magnetic Wave Electricity  Resonant coupling
7. 7. (1/1) Is it secure ???  Works on the principle of magnetic induction.  Interact weakly with surrounding objects (biological tissue)
8. 8. (1/5) Applications  Automatic electronics wireless charging of mobile
9. 9. (2/5)  Direct wireless powering of stationary devices Sony demonstrated its wirelessly powered television [2010 October] Demonstration of WiTricity on cell phone and LCD at the TED conference
10. 10. (3/5)  Direct wireless powering of PC peripherals
11. 11. (4/5)  Automatic wireless charging for electric vehicles
12. 12. (5/5) One source is able to transfer the energy for the electronic devices.
13. 13. Limitations  It is a midrange technology. (max 7.5 m)  The maximum efficiency obtained in full ideal conditions is 95% .  Only obstructions are metal structures like metal doors and metal walls.
14. 14. Bibliography :  www.witricity.com [18feb2012]  www.witricitypower.com [18feb2012]  www.tfcbooks.com [19feb2012]
15. 15. Thank you !
16. 16. Queries ???
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