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--The Wireless Electricity.

PRABAL VARSHNEYEC 3rd YEAR

3G-1

0806331067

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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 iscalled as Witricity.

Because of Witricity some of the devices

won't require batteries to operate.

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.

The story started late one night a

few years ago. It was probably

the sixth time that month that

MIT Professor Marin Soljacicwas 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

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basics

electricity

magnetism

Energy

coupling

Magnetic

induction

Electro

magnetism

Resonant

magnetic

coupling

RESONANCE

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Electromagnetic induction is the

production of voltage across a

conductor moving through a

magnetic field. Electromagnetism is one of the four

fundamental interactions of nature,

along with strong interaction, weak

interaction and gravitation. It is the

force that causes the interaction

between electrically charged

particles; the areas in which this

happens are called electromagnetic

fields Energy/Power Coupling: Energy

coupling occurs when an energy

source has a means of transferring

energy to another object

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Resonance :is the tendency of a

system to oscillate with larger

amplitude at some frequencies thanat others. These are known as the

system's resonant frequencies (or

resonance frequencies). At these

frequencies, even small periodic

driving forces can produce largeamplitude oscillations

Resonant Magnetic Coupling:

Magnetic coupling occurs when two

objects exchange energy throughtheir varying or oscillating magnetic

fields. Resonant coupling occurs

when the natural frequencies of the

two objects are approximately the

same.

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The Transfer of Electricity from one place to another withoutwires is known as Witricity.

There is witricity power sources(transmitter) and capture

devices(receiver).

Power sourceprovides power to the devices where as capture

device captured it to work.

Power source and capture devices are specially designedmagnetic resonators.

Magnetic resonators efficiently transfer power over mid-range

distance via the magnetic near-field.

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Near fieldNear field is a wireless transmission

technique over distances comparable to or afew times the diameter of devices.

Near field is usually magnetic.

Near field energy is non radiative .but some

radiative and resistive losses will occur.

How does Witricity Work?

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Coupled resonators

Two resonant objects of the same resonantfrequency tend to exchange energy.

It exchange energy strongly ,while interactingweakly with living beings and otherenvironmental objects.

Coupled resonators are said to be operate instrongly coupled regime to avoid materialabsorption and radiative loss.

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MIT teams behind witricity technologyThe 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 60Wlight 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 devicePower 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 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.

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Used in power transformers.

conductive coils transmit power to each other

wirelessly, over very short distance.

An electric tooth brush uses

traditional magnetic induction to

recharge its batteries

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Radio frequency energy is used for wireless

power transfer.

Radiated power is wasted into free space

Need line of sight.

Harmful.

Microwave oven utilizes

radiation to cook foods

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Features and benefits

Witricitys Technology Technology Benefit

Highly resonant strong coupling High efficiency over distance

Energy transfer via magnetic near

field

Can penetrate and wrap around

obstacles

Non radiative energy transfer Safe for living beings and other

environmental objects

Flexible geometry Device that can fit intoOEM (original

equipment manufactures)products

Scalable design From Mw to kW

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Applications Direct wireless power

interconnections andautomatic wirelesscharging for implantablemedical devices .

Automatic wireless

charging and for high techmilitary systems.

Direct wireless poweringand automatic wirelesscharging of smartcards.

Direct wireless poweringand automatic wirelesscharging ofconsumerAppliance, mobile robots,etc.

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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 issmall .

Negative health

implications.Highly efficient than

electromagnetic induction

Less costly.

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Limitations

The resonance condition should be satisfied and

if any error exists, there is no possibility of power

transfer.

If there is any possibility of very strong

ferromagnetic material presence, it causes low

power transfer due to radiation.

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CONCLUSION

When Wi-Fi and wireless internet as we know it was first

developed in the early 1990s, it was revolutionary. Now, no more

than twenty years later it is commonplace and mundane.

In line with this vision it would be safe to assume that one day a

person would be able to walk into a bar of coffee shop and would

not only be able to have instant access to the internet but would

also enjoy any devices they have on them being powered or

charging automatically.

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REFERENCES

www.techgadgets.in/wireless/2007/08/witricity-wireless-

electricity-technology-demonstrated-by-mit/

http://www.answers.com/topic/electromagnetic-induction

http://www.witricitypower.com/

http://www.asquare.org/networkresearch/2007/witricity

http://web.mit.edu/newsoffice/2007/wireless-0607.html

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THANK YOUTHANK YOU