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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