Witricity pppt

8/6/2019 Witricity pppt

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WITRICITY

Revolution in the field ofElectricity


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What is Witricity?

Witricity is nothing but wireless transmissionof electricity.

Imagine a future in which wireless electricitymakes everyday products more convenient,

reliable, and environmentally friendly.

Because ofWitricity some of the devices won'trequire batteries to operate.


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.

The story started late one night afew years ago. It was probably thesixth time that month thatMIT

ProfessorM

arin Soljacicsthoughts.Raised a question

How it is possible to useelectricity without using wires

Eureka!CoupledResonators


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In 1891, Sir Nikola Tesla Proposed a method of

Wireless Power Transmission

But it was in Radiative mode, most

of the Power was wasted and had

less efficiency.

HISTORY OF WIRELESS POWER


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Teslas ingenious design for the wirelesstransmission of energy


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Leaded by the innovative thinking ofMARIN SOLJACIC

In the first successful trial of its kind,the team was able to illuminate a 60-wattlight bulb 7ft away .

The team from

Massachusetts Instituteof Technology , who call their

invention WiTricity.


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basics

electricity

magnetism

Energycoupling

Magneticinduction

Electro

magnetism

Resonant

magneticcoupling

resonance


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The flow of electrons (current) through a conductor

(like a wire), or charges through the atmosphere(like lightning). A convenient way for energy to get

from one place to another!

Magnetism

Is a force that acts at a distance due to aMAGNETIC field. This field is causedby moving electrically charged particles

or is inherent in magnetic objects suchas magnet.

Electricity


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Is one of the four fundamental interactions ofnature, along with strong interaction, weak

interaction and gravitation. It is the force that

causes the interaction between electricallycharged particles; the areas in which this

happens are called ELECTROMAGNETICFIELDS

Electromagnetism

Energy/PowerCoupling:

Coupling occurs when an energy source has ameans of transferring energy to another

object by the process of ELETRO MAGNETICINDUCTION.


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Is the tendency ofa system to oscillate with larger amplitude at some

frequencies than at others. These are known as the system's resonantfrequencies (or resonance frequencies).

RESONANCE

ResonantMagnetic

Coupling:

Magnetic coupling occurs when two objectsexchange energy through their varying or

oscilla

tingma

gnetic fields. Resona

ntcoupling occurs when the naturalfrequencies of the two objects areapproximately the same.


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Electrical Resonance

Tendency ofa

circuit system

to oscillate at amaximumamplitude for a certain

resonance frequency.Likely to occur when

impedance between inputand output is minimized.Increases the strength of

interaction between tworelated devicesNatural Frequencyf =1/2p(LC)0.5


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1) Power from mains to antenna,which is made of copper.

2) Antenna resonates.

3) Tails' of energy from antenna'tunnel' up to 5m (16.4ft).

4) Electricity is picked up bylaptop's antenna.


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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 nearfield induced by the power source.

Yellow lines represent the flow ofenergy from the source to the capturecoil.

This powers light bulb.

The magnetic field can wrap around theobstacle between power source andcapture coil.


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WITRICITY APPLICATIONS

Automatic wireless charging ofmobile electronics in home,car, office,...while devices arein use and mobile.

Direct wireless powering ofstationarydeviceseliminating expensivecustom wiring, unsightly

cables and wall-wart powersupplies.


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Direct wireless power interconnections and

automatic wireless charging for implantablemedical devices (ventricular assist devices,

pacemaker, defibrilator, etc.).

Automatic wireless charging and for high

tech military systems (battery poweredmobile devices, covert sensors, unmanned

mobile robots and aircraft, etc.)

Direct wireless powering and automatic

wireless charging of smart cards.

Direct wireless powering and automatic

wireless charging of consumer appliances,

mobile robots, etc.

Other Applications


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Highly Resonant StrongCoupling ProvidesHigh Efficiency OverDistance.

EnergyTransfer viaMagneticNear FieldCan Penetrate and WrapAroundObstacles.

Non-RadiativeEnergyTransfer is Safe for People andAnimals.

ScalableDesign Enables Solutions from milliwatts to Kilowatts.

FlexibleGeometryAllows WiTricityDevices to be Embedded Into OEMProducts.

Salient Features:


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ADVANTAGES

No need of line of sight.

No need of power cablesand 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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(Wireless power transmission can be

possible only in few meters.

(Efficiency is only about 40%.


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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 evenrobots on factory floors.

In another 3 to 5 years time. they will come

up with a witricity for commercial use.


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Documents

Witricity pppt