Wireless Electricity

An exciting technology-The Wireless Electricity & Wireless Power Transmission

1. ‘ WITRICITY ’ - Wireless Electricity Submitted By: - Sayantany Ghanty Saumyadip Moitra Satyajit Marik SumantaDas Rishi Roy Submitted To- BCREC Electrical Dept.(2013) 1

2. Slide Plan.... What is ‘Witricity’? History of Wireless power. Basic Principle. Experimental Design How does ‘Witricity’ Work? Applications of ‘Witricity’. Advantages & Disadvantages. Electromagnetic Hazards Recommendations EE/3 rd Sem/Witricity 2

3. What is ‘ Witricity ’? : Electricity without wires Magnetic loop antennas Electromagnetic near-field Magnetic Field around a bar magnet EE/5th Sem/Witricity 3

4. History of Wireless Power: In 1893,Nikola Tesla publicly demonstrates wireless power before a meeting of the National Electric Light Association in St. Louis. In 1894, Nikola Tesla lights incandescent lamps wirelessly at the laboratory in New York City by means of "electro-dynamic induction" or resonant inductive coupling. Jagdish Chandra Bose rings a bell at a distance using  electromagnetic  waves and also ignites gunpowder , thus contributing & developing to wireless electrical power transfer in the year 1894. EE/5th Sem/’Witricity’ 4

5. RESONANCE COUPLING: MIT powered 60 watt light bulb from 2 meters (7 ft) at 40% efficiency The forgotten invention is reborn in 2007 A group of engineers at MIT came up with the idea to use resonant induction to transmit power wirelessly. “Resonance", a phenomenon that causes an object to vibrate when energy of a certain frequency is applied. EE/5thSem/Witricity 5

6. Basic Principle: The basic principle involved in ‘Witricity’ concept is, Two objects having same resonating frequency and in Magnetic resonance at Strongly coupled regime tend to exchange energy , while dissipating relatively little energy to the extraneous off-resonant objects. EE/3 rd Sem/Witricity 6

7. Experimental Design: Our experimental scheme consists of two Self-resonant coils. One coil (source coil) is coupled inductively to an oscillating circuit; the other (device coil) is coupled inductively to a resistive load. Self-resonant coils rely on the interplay between distributed inductance and distributed capacitance to achieve resonance. EE/5th Sem/Witricity 7

8. How does ‘Witricity’ Work? : Near-field inductive coupling through magnetic fields Interact weakly with surrounding objects (biological tissue) EE/3 rd Sem/Witricity 8

9. Evanescent wave coupling The microwave source consists of a microwave oven magnetron with electronics to control the output power. The output microwave power ranges from 50 W to 200 W at 2.45 GHz This rectenna has a 25% collection and conversion efficiency, but rectennas have been tested with greater than 90% efficiency at 2.45 GHz. 9

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11. Applications of ‘Witricity’ : ‘ Witricity’ Present day On April 27,2011 leading Japanese car-manufacturer Toyota signed an agreement with WiTricity Corpn. regarding the sharing of wireless technology in their hybrid cars. Sony showed a wireless electrodynamic-induction powered TV set, 60 W over 50 cm Haier Group debuted “the world's first” completely wireless LCD television Intel  implemented electrodynamic induction by wirelessly powering a nearby light bulb with 75% efficiency. Palm (now a division of HP) launched the Palm Pre smart phone with the Palm Touchstone wireless charger. EE/5th Sem/Witricity 11

12. ‘Witricity’ Future Automatic wireless charging of mobile electronics (phones, laptops, game controllers, etc.) in home, car, office, Wi-Fi hotspots … while devices are in use and mobile. Direct wireless power and communication interconnections at points of use in harsh environments (drilling, mining, underwater, etc.) … where it is impractical or impossible to run wires. Automatic wireless charging for existing electric vehicle classes: golf carts, industrial vehicles. Automatic wireless charging for future hybrid and all-electric passenger and commercial vehicles, at home, in parking garages, at fleet depots, and at remote kiosks. Direct wireless power interconnections and automatic wireless charging for implantable medical devices ( pacemaker, defibrilator, etc.). EE/5th Sem/Witricity 12

13. WORLD IN OUR DREAMS 13

14. radiationHazards These hazards will exist when an electromagnetic field of sufficient intensity is generated to: (a) induce or otherwise couple currents or voltages large enough to initiate electroexplosive devices or other sensitive explosive components of weapon systems, ordnance, or explosive devices; (b) cause harmful or injurious effects to humans and wildlife; (c) create sparks having sufficient magnitude to ignite flammable mixtures of materials that must be handled in the affected area. 14

15. Need of ‘Witricity’: Now a days there is a Rapid development of autonomous electronics like Laptops , Cell-phones , House-hold robots and all those devices typically rely on chemical energy storage(Battery) As they are becoming daily needs to present generation, Wire less energy transfer would be useful for many applications as above and they need midrange energy. EE/5thSem/Witricity 15

16. Advantages of ‘witricity’: No Need of Wires For Power Transfers. Highly Resonant Strong Coupling Provides High Efficiency Over Distance Energy Transfer via Magnetic Near Field Can Penetrate and Wrap Around Obstacles EE/5thSem/Witricity Disadvantages of ‘Witricity’: Mainly require short distances to charge Does not give enough energy to power larger vehicles and equipment Cost and supplying the public Still under production and improvement 16

17. In theory, there are endless possibilities for the application of Wireless Electricity ,however it is yet to be tried & tested on a large scale basis .The experimental results have so far been positively reviewed by scientists & electrical engineers but its widespread applications are yet to be fully understood & applied. There need to be further investments in the field of wireless electrical energy transfer so as to widen & deepen its applications. Recommendation: 17

18. Thank You 18