An exciting technology-The Wireless Electricity & Wireless Power Transmission

1. Submitted By:-
Sayantany Ghanty
Saumyadip Moitra
Satyajit Marik
SumantaDas
Rishi Roy
Submitted To-
BCREC Electrical Dept.(2013) 1

2. What is ‘Witricity’?
History of Wireless power.
Basic Principle.
Experimental Design
How does ‘Witricity’ Work?
Applications of ‘Witricity’.
Advantages & Disadvantages.
Electromagnetic Hazards
Recommendations
EE/3rd Sem/Witricity
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3.  Electricity without wires
 Magnetic loop antennas
 Electromagnetic near-field
Magnetic Field around a bar magnet
EE/5th Sem/Witricity
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4. History of Wireless Power:
 In 1893,Nikola Tesla publicly
demonstrates wireless power before a
meeting of the National Electric Light
Association in St. Louis.
 In 1894, Nikola Tesla lights
incandescent lamps wirelessly at
the laboratory in New York City by
means of "electro-dynamic induction" or
resonant inductive coupling.
Jagdish Chandra Bose rings a
bell at a distance
using electromagnetic waves and
also ignites gunpowder , thus
contributing & developing to
wireless electrical power transfer
in the year 1894.
EE/5th Sem/’Witricity’
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5. RESONANCE COUPLING:
MIT powered 60 watt light bulb from 2 meters (7 ft) at 40% efficiency
The forgotten invention is reborn in 2007
A group of engineers at MIT came up with the idea to use resonant induction to
transmit power wirelessly.
“Resonance", a phenomenon that causes an object to vibrate when energy of a
certain frequency is applied.
EE/5thSem/Witricity
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6. Basic Principle:
The basic principle involved in ‘Witricity’ concept is,
Two objects having same resonating frequency and in Magnetic
resonance at Strongly coupled regime tend to exchange energy ,
while dissipating relatively little energy to the extraneous off-
resonant objects.
EE/3rd Sem/Witricity
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7. Experimental Design:
Our experimental scheme consists of two Self-resonant
coils. One coil (source coil) is coupled inductively to an
oscillating circuit; the other (device coil) is coupled
inductively to a resistive load. Self-resonant coils rely on the
interplay between distributed inductance and distributed
capacitance to achieve resonance.
EE/5th Sem/Witricity
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8.  Near-field inductive coupling through
magnetic fields
 Interact weakly with surrounding objects
(biological tissue)
EE/3rd Sem/Witricity
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9.  The microwave source
consists of a microwave oven
magnetron with electronics
to control the output power.
The output microwave
power ranges from 50 W to
200 W at 2.45 GHz
 This rectenna has a 25%
collection and conversion
efficiency, but rectennas
have been tested with
greater than 90% efficiency
at 2.45 GHz.
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11.  On April 27,2011 leading Japanese car-manufacturer Toyota
signed an agreement with WiTricity Corpn. regarding the sharing
of wireless technology in their hybrid cars.
 Sony showed a wireless electrodynamic-induction powered TV
set, 60 W over 50 cm
 Haier Group debuted “the world's first” completely wireless LCD
television
 Intel implemented electrodynamic induction by wirelessly
powering a nearby light bulb with 75% efficiency.
 Palm (now a division of HP) launched the Palm Pre smart phone
with the Palm Touchstone wireless charger.
EE/5th Sem/Witricity
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12. Automatic wireless charging of mobile electronics (phones, laptops, game
controllers, etc.) in home, car, office, Wi-Fi hotspots … while devices are in
use and mobile.
Direct wireless power and communication interconnections at points of
use in harsh environments (drilling, mining, underwater, etc.) … where it is
impractical or impossible to run wires.
Automatic wireless charging for existing electric vehicle classes: golf
carts, industrial vehicles.
Automatic wireless charging for future hybrid and all-electric passenger
and commercial vehicles, at home, in parking garages, at fleet depots, and
at remote kiosks.
Direct wireless power interconnections and automatic wireless charging
for implantable medical devices ( pacemaker, defibrilator, etc.).
EE/5th Sem/Witricity
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14. These hazards will exist when an electromagnetic field of sufficient
intensity is generated to: (a) induce or otherwise couple currents or
voltages large enough to initiate electroexplosive devices or other
sensitive explosive components of weapon systems, ordnance, or
explosive devices; (b) cause harmful or injurious effects to humans and
wildlife; (c) create sparks having sufficient magnitude to ignite flammable
mixtures of materials that must be handled in the affected area.
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15. Need of ‘Witricity’:
Now a days there is a Rapid development of autonomous
electronics like Laptops, Cell-phones, House-hold robots and all
those devices typically rely on chemical energy storage(Battery)
As they are becoming daily needs to present generation, Wire
less energy transfer would be useful for many applications as
above and they need midrange energy.
EE/5thSem/Witricity
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16. Advantages of ‘witricity’:
No Need of Wires For Power Transfers.
Highly Resonant Strong Coupling Provides High
Efficiency Over Distance
Energy Transfer via Magnetic Near Field Can
Penetrate and Wrap Around Obstacles
EE/5thSem/Witricity
Disadvantages of ‘Witricity’:
Mainly require short distances to charge
Does not give enough energy to power larger
vehicles and equipment
Cost and supplying the public
Still under production and improvement
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17. In theory, there are endless possibilities for the application of Wireless
Electricity ,however it is yet to be tried & tested on a large scale basis
.The experimental results have so far been positively reviewed by
scientists & electrical engineers but its widespread applications are yet
to be fully understood & applied. There need to be further investments
in the field of wireless electrical energy transfer so as to widen &
deepen its applications.
Recommendation:
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