witricity

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Submitted By:-Rahul Shrimali

ECE 4th Year

TECHNO INDIA NJR INSTITUTE OF TECHNOLOGY, UDAIPUR

ATechnical Seminar Presentation

On

“WITRICITY- WIRELESS ELECTRICTY”

Seminar Guide:- Mr. Abhishek AcharyaLecturer Electronics & Communication TINJRIT,( Udaipur )

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What is witricity?

Witricity is nothing but wireless

electricity.

Transmission of electrical energy from

one object to another without the use of

wires is called as Witricity.

Because of Witricity some of the devices

won't require batteries to operate.

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.

WIreless elecTRICITY

†The story started late one night a few years ago.

†It was probably the sixth time that month that MIT

Professor Marin Soljacic was awakened by his mobile

phone beeping battery low.

†At that time it occurred to him that there is electricity

wired all through his house, office-everywhere. He think

about- how it is possible to use electricity without using

wires…

Story behind WITRICITY

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basics

electricity

magnetism

Energy coupling

Magnetic induction

Electro magnetis

m

Resonant magnetic coupling

resonance

Basics of WITRICITY

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The Transfer of Electricity from one place to another without wires is known as “Witricity”.

There is witricity power sources(transmitter) and capture devices(receiver).

Power source provides power to the devices where as capture device captured it to work.

Power source and capture devices are specially designed magnetic resonators.

Magnetic resonators efficiently transfer power over large distance via the magnetic near-field.

WITRICITY TECHNOLOGY

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Near field Near field is a wireless transmission technique over distances

comparable to or a few times the diameter of devices.

Near field is usually magnetic field.

Near field energy is non radiative, but some radiative and

resistive losses will occur.

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Coupled resonators Two resonant objects of the same resonant

frequency tend to exchange energy.

It exchange energy strongly ,while interacting weakly with living beings and other environmental objects.

Coupled resonators are said to be operate in strongly coupled regime to avoid material absorption and radiative loss.

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Strong coupling

Strength of interaction is very high.

Energy transfer is very efficient.

The rate of energy transfer is

substantially higher than rate of

energy lose.

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MIT teams behind witricity technology

The first experiment of witricity, the concept of wireless electricity,

was conducted in the year 2006, by researchers from Massachusetts

Institute of Technology. The Assistant Professor of this team of

researchers was Marin Soljacic.

2007: A physics research group, led by

Prof. Marin Soljacic,at MIT, wirelessly

power a 60W light bulb with 40%

efficiency at a 2 meters (6.6 ft) distance

using two 60 cm-diameter coils

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Diagram of power source and capture device

Power source is connected to ac power.

Bulb is connected to capture device.

Blue lines represent the magnetic near field induced by the power source.

Yellow lines represent the flow of energy from the source to the capture coil.

This powers light the bulb.

The magnetic field can wrap around the obstacle between power source and capture coil.

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Witricity technology is more than…

Traditional magnetic induction.

Radiative power transfer.

Tesla’s vision of a wireless world.

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Used in power transformers. conductive coils transmit power to each

other wirelessly, over very short distance.

Traditional magnetic induction

An electric tooth brush uses traditional magnetic induction to recharge its batteries

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If Radio frequency energy is used for wireless power transfer.

Radiated power is wasted into free space Need line of sight. Harmful.

Radiative power transfer

Microwave oven utilizes radiation to cook foods

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Tesla’s vision of a wireless world

Nikola Tesla the most well known scientist had a vision of wireless world.

In which wireless electric power and communication would reach around the world, delivering information and power.

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Features and benefits

Non radiative energy transfer

Safe for living beings and other environmental objects

Flexible geometry Device that can fit into OEM (original equipment manufactures)products

Scalable design From Mw to kW

Energy transfer via magnetic near field

Can penetrate and wrap around obstacles

Highly resonant strong coupling

High efficiency over distance

Witricity’s Technology Technology Benefit

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Witricity technology can provide…

Direct wireless power-within the range of witricity power source

Automatic wireless charging- both in and out of range of its witricity power source.

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Applications

Consumer electronics

Industrial

Transportation…

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WITRICITY APPLICATIONS

Automatic wireless charging of

mobile electronics in home, car,

office,...while devices are in use

and mobile.

Direct wireless powering of

stationary devices…eliminating

expensive custom wiring,

unsightly cables and “wall-wart”

power supplies.

CONSUMER ELECTRONICS

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Robots, package machinery,

assembly machinery, machine

tools.

Direct wireless power and

communication interconnections

at points of use in harsh

environments.

Direct wireless power for wireless

sensors and actuators, eliminating

the need for expensive power

wiring or battery replacement and

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INDUSTRIAL

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Application continues……………

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.

TRANSPORTATION

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ADVANTAGES

No need of line of sight.

No need of power cables and

batteries.

Does not interfere with radio waves.

•Wastage of power is small

•Negative health implications.

•Highly efficient than

electromagnetic induction

•Less costly.

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Wireless power transmission can be possible only in few meters.

Efficiency is only about 40%.

Disadvantages

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FUTURE OF WITRICITY

Teams’ next aim is to get a robotic vacuum or a

laptop working, charging devices placed any where

in the room and even robots on factory floors.

In another 3 to 5 years time. they will come up with

a witricity for commercial use.

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REFRENCES

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.

H. Haus , “Waves and Fields in Optoelectronics”, Prentice hall Publishers, Englewood

http://electron9.phys.utk.edu/optics507/modules/m6/coupled_resonators.htm

“Efficient Non-Radiative Midrange Energy Transfer” by Aristeidies karalis, Marlin Soljacic.

Nikola Tesla, My Inventions, Ben Johnston, Ed., Austin, Hart Brothers, p. 91,1982.

Thomas F. Valone, “ Tesla’ s Wireless Energy... For the 21st Century!!! One Step Beyond Direct TV!!!” Extra Ordinary Technology, 1, no. 4, Oct / Nov / Dec 2003.

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