Witricity Sushila
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Transcript of Witricity Sushila
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Sunday, April 15, 20121
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Witricity is nothing butwireless 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 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
Eureka! Coupled Resonators
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4
wireless electricity
basics
electricity
magnetism
Energycoupling
Magneticinduction
Electro
magnetism
Resonant
magnetic
coupling
resonance
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Electricityis a general term thatencompasses a variety ofphenomena resulting from the
presence and flow of electriccharge.
Magnetism is a force that acts at adistance due to a magnetic field.
This field is caused by movingelectrically charged particles or isinherent in magnetic objects suchas magnet.
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Electromagnetic inductionis the
production of voltage across a
conductor moving through a
magnetic field.
Electromagnetismis one of the
four fundamental interactions of
nature, along with strong
interaction, weak interaction and
gravitation. It is the force thatcauses the interaction between
electrically charged particles; the
areas in which this happens are
called electromagnetic fieldsEnergy/Power Coupling: Energy
coupling occurs whenanenergy
source has a means of
transferring energy to another
object
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Resonance :is the tendency of asystem to oscillate with largeramplitude at some frequencies
than at others. These are knownas the system's resonantfrequencies (or resonancefrequencies). At thesefrequencies, even small periodic
driving forces can produce largeamplitude oscillations
Resonant Magnetic Coupling:Magnetic coupling occurs whentwo objects exchange energythrough their varying oroscillating magnetic fields.Resonant coupling occurs whenthe natural frequencies of the twoobjects are approximately thesame.Sunday, April 15, 2012wireless electricity 7
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The Transfer of Electricity from one place to another withoutwires is known as Witricity.
There is witricity power sources(transmitter) andcapture
devices(receiver).
Power source provides power to the devices where as capture
devicecaptured it to work.
Power source and capture devices are specially designedmagnetic resonators.
Magnetic resonators efficiently transfer power over large
distance via the magnetic near-field.
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Near field is a wireless transmissiontechnique over distances comparable to or
a few times the diameter of devices.
Near field is usually magnetic.
Near field energy is non radiative .but some
radiative and resistive losses will occur.
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Two resonant objects of the same resonantfrequency tend to exchange energy.
Itexchange energy strongly ,whileinteracting weakly with living beings and
other environmental objects.
Coupled resonators are said to be operate in
strongly coupled regimeto avoid material
absorption and radiative loss.Sunday, April 15, 2012wireless electricity 10
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Strength of interaction is very high.
Coupling constantg>=1
Energy transfer is very efficient.
The rate of energy transfer is substantiallyhigher than rate of energy lose.
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The first experiment of witricity, the concept of
wireless electricity, was conducted in the year 2006, by
researchers from Massachusetts Institute ofTechnology. 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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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 bulb.
The magnetic field can wrap
around the obstacle between power
source and capture coil.
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Traditional magnetic induction.
Radiative power transfer.
Teslas 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.
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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.
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Microwave oven utilizes
radiation to cook foods
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Nikola Tesla the most well
known scientist had a visionof wireless world.
In which wireless electric
power and communicationwould reach around the
world, delivering information
and power.
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Witricitys Technology Technology BenefitHighly 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 otherenvironmental objects
Flexible geometry Device that can fit into OEM
(original equipmentmanufactures)products
Scalable design From Mw to kW
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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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Automatic wireless charging
of mobile electronics in
home, car, office,...while
devices are in use and
mobile.
Direct wireless powering of
stationary
deviceseliminating
expensive custom wiring,unsightly cables and wall-
wart power supplies.
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Robots, packagemachinery, assemblymachinery, machinetools.
Direct wireless powerand communicationinterconnections atpoints of use in harshenvironments.
Direct wireless powerfor wireless sensorsand actuators,eliminating the needfor expensive powerwiring or batteryreplacement anddisposal.
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Automatic wireless
charging for existingelectric vehicle classes:golf carts, industrialvehicles.
Automatic wirelesscharging for futurehybrid and all-electricpassenger and
commercial vehicles, athome, in parkinggarages, at fleet depots,and at remote kiosks.
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Direct wireless powerinterconnections and
automatic wirelesscharging for implantable
medical devices .
Automatic wireless
charging and for high tech
military systems.
Direct wireless powering
and automatic wireless
charging of smartcards.
Direct wireless poweringand automatic wireless
charging ofconsumer
Appliance, mobile robots,
etc.
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No need of line of sight.
No need of power cablesand batteries.
Does not interfere with
radio waves.
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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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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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