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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