Witricity Final

8/3/2019 Witricity Final

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DONE BY:-ROMIL GANDHI

DHRUV BANSALRADHA MEHTA


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WiTricity stands for "wireless electricity.It is a trademark of WiTricitycorporation referring to their devices and

processes .They use a form of wireless energy transferand provide electrical energy to remoteobjects without wires using oscillating

magnetic fields.The term WiTricity was first used for aproject that took place at MIT, led by

Prof.Marin Soljai in 2007.


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Electricity

EnergyCoupling

Resonance

MagneticInduction

ResonantMagneticCoupling

Magnetism

BASICS


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Electromagnetic induction:-It isthe production of voltage acrossa conductor moving through a

magnetic field.Electromagnetism:- It is one ofthe four fundamentalinteractions of nature, along withstrong interaction, weak

interaction and gravitation. It isthe force that causes theinteraction between electricallycharged particles; the areas inwhich this happens are called

electromagnetic fields.Energy/Power Coupling:-Energy coupling occurs whenanenergy source has a means oftransferring energy to another

object.


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Resonance:- It is the tendency of a system to oscillatewith larger amplitude at some frequencies than atothers. These are known as the system's resonant

frequencies (or resonance frequencies). At thesefrequencies, even small periodic driving forces canproduce large amplitude oscillations.Resonant Magnetic Coupling:-Magnetic couplingoccurs when two objects exchange energy throughtheir varying or oscillating magnetic fields. Resonantcoupling occurs when the natural frequencies of thetwo objects are approximately the same.


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WiTricity power sources(transmitter) andcapture devices(receiver) are speciallydesigned magnetic resonators that efficiently

transfer power over large distances via themagnetic near-field.

These proprietary source and device designs

and the electronic systems that control themsupport efficient energy transfer over distancesthat are many times the size of thesources/devices themselves.


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Two resonant objects of the same resonant

frequency tend to exchange energy.It exchange energy strongly ,while interactingweakly with living beings and other environmentalobjects.Coupled resonators are said to be operate in

strongly coupled regime to avoid material absorptionand radiative loss.

Strength of interaction is very high.Coupling constant g>=1Energy transfer is very efficient.The rate of energy transfer is substantially higherthan rate of energy lose.


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Power source isconnected to ac power.

Bulb is connected to

capture device.

Blue lines representthe magnetic near fieldinduced by the powersource.

Yellow lines representthe flow of energy fromthe source to thecapture coil.

This powers light bulb.

The magnetic field canwrap around theobstacle between

power source andcapture coil.

Diagram of power source and capture device


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Witricitys Technology Technology Benefit

Energy transfer via magneticnear field

High efficiency over distance

Non radiative energytransfer

Can penetrate and wraparound obstacles

Scalable design From Mw to kW

Scalable design Device that can fit into OEM(original equipmentmanufactures)products

FEATURESANDBENEFITS


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Consumer electronicsIndustrialTransportation

No need of power cables and batteries.No need of line of sight.Does not interfere with radio waves.Wastage of power is small .Negative health implications.Highly efficient than electromagnetic inductionLess costly.


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Witricity Final