This document discusses wireless power transmission (WiTricity). It provides a brief history of wireless power beginning with Nikola Tesla's experiments in the late 1800s. In 2007, MIT researchers successfully transmitted 60 watts of power over 2 meters without wires using resonant inductive coupling. The document describes three types of wireless power transmission - short range inductive coupling, medium range resonant induction, and long range electromagnetic waves. It discusses the mechanisms, applications, advantages, and limitations of WiTricity, and envisions a future where wireless power could eliminate wires and batteries.

1. WITRICITY
“Wireless Electricity”
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2. Contents
 What do you mean by Wi Tricity?
 Need of Witricity
 History of wireless power
 Witricity basics
 Detailed Principle
 How safe is Witricity?
 What’s the future of witricity?
 Advantages
 Application
 Limitation
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3. AIM OF WIRELESS POWER
 The Ultimate Aim of this project is Transmit
the Power By Wireless mode which can be
used in electrical/electronic devices for general
use.
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4. FIRST OPERATION OF
WITRICITY
 On June 7’ 07, a team of researchers at MIT
announced the successful operation of Witricity
concept.
 They had lit up a 60W with a power from a source at
the distance of 7 feet(over 2m) with no wires.
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5. History of Wireless Power
 In 1899, Sir Nikola Tesla
Proposed a method of Wireless
Power Transmission.
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6.  In1899,Tesla achieved
a major breakthrough
in his work at Colorado
by transmitting 100
million volts of electric
power wirelessly over a
distance of 26 miles to
light up a bank of 200
light bulbs and run one
electric motor.
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7. In Layperson’s Terms
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 Wireless electricity is the transfer of power to a
device over the air.
 — It will allow devices to be powered or charged (with the
proper wireless attachments) without being plugged into
a wall outlet or docked in a charging station.

8. THE FORGOTTEN INVENTION IS REBORN
IN 2007
RESONANCE COUPLING
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.
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9. Three major types
 Short range; Inductive Coupling
 Medium range; Resonant Induction
 Long range; Electromagnetic Wave Power
Transfer
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10. Short Range Wireless Energy Transmission:
Inductive Coupling
 What Is Inductive Coupling?
 Inductive Coupling is a method for short range
wireless energy transfer.
 Its range can vary, but it’s often very short.
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11. How does Inductive Coupling
Work?
 Inductive coupling works on the
principles of electromagnetism:
When a current (electricity) passes
through a wire, it generates a magnetic
field perpendicular to the wire.
When a wire is in proximity to a
magnetic field, it generates a current in
that wire.
Magnetic fields decay quickly ,
making inductive coupling effective
only at very short ranges.
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12. Medium Range Wireless Energy
Transmission: Resonant Induction
 What Is Resonant Induction?
 A group of engineers at MIT came up with the
idea to use resonant induction to transmit
power wirelessly. They deemed their result
“WiTricity” (like Wi-Fi) . WiTricity can transmit
electricity wirelessly at 40% efficiency to about
7 feet.
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13. HOW WIRELESS POWER
WORKS
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1. Magnetic coil (transmitter) is housed in a box and can
be set in wall or ceiling.
2. Transmitter, powered by mains, resonates at a specific
frequency.
3. Electromagnetic waves transmitted through the air.
4. Second magnetic coil (receiver) fitted in laptop/TV etc
resonates at same frequency as first coil and absorbs
energy.
5. Energy charges the device.

14. Experimental Design
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15. Mechanism
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16. Now the questions are?
 Is WiTricity safe?
 How much power can be transferred?
 What about the range of transferred?
 How efficient is WiTricity?
 What's the Future of WiTricity?
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17. Wi Tricity Applications
 Consumer Electronics
 Industrial
 Transportation
 Miscellaneous
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18. Current Uses
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 Wireless charging pads
 Electric Toothbrushes:
 Both of these techniques use small electric
fields to charge the devices.
 Haier America Digital Products group has
already developed a HDTV that transmits
electricity and the HD signal, making the TV
completely wireless.

19. Advantages
 Safe, fairly efficient, good range:
 Magnetic fields interact weakly with biological
masses (humans),
 Efficiency can be increased with time, most of
the 60% lost is from heat radiated from the coils.
 Theoretically one stationary coil in a room could
power multiple devices with receiving coils.
 No more messy wires, and with widespread
enough use it could even eliminate costly
batteries.
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20. 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 causes low power transfer due to
radiation.
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21. What's the Future of WiTricity?
 MIT's WiTricity is only 40 to 45% efficient and
they have to be twice as efficient to
compete with the traditional chemical
batteries.
 The researchers have said that in another
five years time, they will come up with a
WiTricity system for commercial use.
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22. WORLD IN OUR DREAM
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23. THANK YOU