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By Brian Dsouza
Ec - 8th sem
WITRICITY
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Contents:
Why wireless power?
Brief history
Introduction
Ways of electricity transmission
Illustration of wireless electricity
Applications
Future implications
Conclusion
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3.
We Humans Love Electricity!
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And to power our electronic devices we buy:
40 million disposable batteries/yr !

4.
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This is where it ends up:

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Wire ... A burden...
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6.
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History of wireless power
• In 1899, Sir Nikola Tesla Proposed
a method of Wireless Power
Transmission.
• As it is in Radiative mode, most of
the Power was wasted and has less
efficiency.

7.
A group of engineers at MIT came up with the idea to use resonant
induction to transmit power wirelessly.
The forgotten invention is reborn in
2007
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8.
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Ways of Transmission
Near field
1. Induction
2. Resonant induction
Far field
1. Radio and microwave transmission
2. Laser

9.
Basics
Inductive
Coupling
Magnetic
feildResonanance
Witricity Basics
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10.
Witricity Basics
Resonance is the tendency of a system to
oscillate with greater amplitude at some
frequencies than at others.
Two conductors are mutual-inductively
coupled when they are configured such that
change in current flow through one wire
induces a voltage across the ends of the
other wire through electromagnetic
induction.
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11.
Basic Principle of Resonant Induction
The basic principle involved in Witricity concept is two
coils having same resonating frequency tend to exchange
maximum energy.
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12.
Circuit Diagram of RIC
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13.
Creating basic resonant induction circuitary
Primary coil setup:
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The Secondary Coil:
•This circuit is one of the simplest
you can ever create.
•It is composed of magnet wire coil
but smaller than the primary, a
capacitor also like the primary, and
some leads you can attach things
like LED.
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16.
Effeciency chart of witricity
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Experimental results of MIT experiment

17.
Increasing Range
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Advantages of this technique
No wires
Need for battery is eliminated
ewaste is eliminated
Maintenance cost is Saves
infrastructureless
Range can be increased
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19.
Disadvantages of Resonant Wireless
electricity:
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Distance constraint
Initial cost is high
In RIC, tuning is difficult
High frequency signals must be the supply
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How Safe is Witricity?
Human beings or other objects placed between
the transmitter and receiver do not hinder the
transmission of power.
Magnetic fields tend to interact very weakly with
the biological tissues of the body, and so are not
prone to cause any damage to any living beings.
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Wireless Electricity Applications
 In Immobile devices
 Cellphones , Tv’s , remotes
 Medical applications
 Industrial applications
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22.
Charging Electric Car using WiTricity
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23.
Future of Wireless Electricity
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24.
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25.
Think that the city will be
covered with WiTricity hot
spots , just like Wireless
Internet, there will be no
need of charging batteries,
or carrying adapters all
around !
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Queries….
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