Published on March 15, 2014
By Brian Dsouza Ec - 8th sem WITRICITY SCEM DEPT OF EC 1
Contents: Why wireless power? Brief history Introduction Ways of electricity transmission Illustration of wireless electricity Applications Future implications Conclusion SCEM DEPT OF EC 2
We Humans Love Electricity! SCEM DEPT OF EC 3 And to power our electronic devices we buy: 40 million disposable batteries/yr !
SCEM DEPT OF EC 4 This is where it ends up:
Wire ... A burden... 5SCEM DEPT OF EC
SCEM DEPT OF EC 6 History of wireless power • In 1899, Sir Nikola Tesla Proposed a method of Wireless Power Transmission. • As it is in Radiative mode, most of the Power was wasted and has less efficiency.
A group of engineers at MIT came up with the idea to use resonant induction to transmit power wirelessly. The forgotten invention is reborn in 2007 SCEM DEPT OF EC 7
SCEM DEPT OF EC 8 Ways of Transmission Near field 1. Induction 2. Resonant induction Far field 1. Radio and microwave transmission 2. Laser
Basics Inductive Coupling Magnetic feildResonanance Witricity Basics SCEM DEPT OF EC 9
Witricity Basics Resonance is the tendency of a system to oscillate with greater amplitude at some frequencies than at others. Two conductors are mutual-inductively coupled when they are configured such that change in current flow through one wire induces a voltage across the ends of the other wire through electromagnetic induction. SCEM DEPT OF EC 10
Basic Principle of Resonant Induction The basic principle involved in Witricity concept is two coils having same resonating frequency tend to exchange maximum energy. SCEM DEPT OF EC 11
Circuit Diagram of RIC SCEM DEPT OF EC 12
Creating basic resonant induction circuitary Primary coil setup: SCEM DEPT OF EC 13
The Secondary Coil: •This circuit is one of the simplest you can ever create. •It is composed of magnet wire coil but smaller than the primary, a capacitor also like the primary, and some leads you can attach things like LED. 14SCEM DEPT OF EC
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Effeciency chart of witricity 16SCEM DEPT OF EC Experimental results of MIT experiment
Increasing Range SCEM DEPT OF EC 17
18 Advantages of this technique No wires Need for battery is eliminated ewaste is eliminated Maintenance cost is Saves infrastructureless Range can be increased SCEM DEPT OF EC
Disadvantages of Resonant Wireless electricity: 19 Distance constraint Initial cost is high In RIC, tuning is difficult High frequency signals must be the supply SCEM DEPT OF EC
How Safe is Witricity? Human beings or other objects placed between the transmitter and receiver do not hinder the transmission of power. Magnetic fields tend to interact very weakly with the biological tissues of the body, and so are not prone to cause any damage to any living beings. 20SCEM DEPT OF EC
21 Wireless Electricity Applications In Immobile devices Cellphones , Tv’s , remotes Medical applications Industrial applications SCEM DEPT OF EC
Charging Electric Car using WiTricity SCEM DEPT OF EC 22
Future of Wireless Electricity 23SCEM DEPT OF EC
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Think that the city will be covered with WiTricity hot spots , just like Wireless Internet, there will be no need of charging batteries, or carrying adapters all around ! 25SCEM DEPT OF EC
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27 Queries…. SCEM DEPT OF EC
WiTricity Corporation developed highly resonant wireless power transfer, and is the foundational technology for wireless electricity via magnetic resonance.
Dr Hall: I don't think they realized exactly what we've done. They were certainly dreaming of wireless power -- there's no question about that.
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Wireless electricity is an area that has been researched by Nikola Tesla, it is an amazing method of passing electric waves over huge distances.
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