This document discusses WiTricity, a technology that enables wireless power transfer over mid-range distances without wires or cables. It provides a brief history of wireless power, outlines the three main types of wireless power transfer, and describes how resonant induction works to increase range. The key benefits of WiTricity are that it provides efficient energy transfer over distance while being safe for people and can penetrate obstacles. Applications include powering consumer electronics, transportation, medical devices, and beaming power to drones or satellites.

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2. TABLE OF CONTENTS
 INTRODUCTION
 HISTORY
 BASICS
 WORKING
 ADVANTAGES
 DISADVANTAGES
 CONCLUSION

3. WHAT IS WITRICITY
Electricity without wires
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4. 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.
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5. The forgotten invention is reborn in
2007
The idea of wireless
electricity has been
around since the
early days of the
Tesla coil. But thanks
to a group of MIT
scientists, team led
by Marin Soljačić and
named it "WiTricity"
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6. There are 3 major types , each with different
ranges, methods of transfer
– Short range: Inductive Coupling
– Medium range: Resonant Induction
– Long range: Electromagnetic Wave Power
Transfer
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7. HOW DOES RESONANT
INDUCTION WORKS
 Same principles as magnetic induction, but uses
resonance to increase the range.
 Everything resonates at a certain frequency, based on
its shape and material.
 Energy transfers easily between resonating objects.
 With resonant induction, power is transmitted between
two resonating coils.
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8. RESONANT MAGNETIC COUPLING
Magnetic coupling occurs when two
objects exchange energy through their
varying or oscillating magnetic fields.
Resonant coupling occurs when the
natural frequencies of the two objects are
approximately the same.
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9. WORKING:

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13. WiTricity Technology: The Basics
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14.  There are witricity power sources(transmitter) and
capture devices(receiver).
 Power source provides power to the devices where as
capture device captured it to work.
 Power source and capture devices are specially
designed ‘‘strongly-coupled’’ resonators for midrange
wireless non-radiative energy transfer
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15. Witricity Features
Highly Resonant Strong Coupling Provides
High Efficiency Over Distance
Energy Transfer via Magnetic Near Field Can
Penetrate and Wrap Around Obstacles
 Non-Radiative Energy Transfer is Safe for
People and Animals
 Flexible Geometry Allows WiTricity Devices to
be Embedded Into Different Products
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16. It will make products :
• More Convenient:
-No manual recharging or changing batteries.
-Eliminate unsightly, unwieldy and costly power cords.
• More Reliable:
-Never run out of battery power.
-Reduce product failure rates by fixing the ‘weakest link’: flexing wiring and
mechanical interconnects.
• More Environmentally Friendly:
-Reduce use of disposable batteries.
-Use efficient electric ‘grid power’ directly instead of inefficient battery
Charging.
Benefits of witricity
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17. ADVANTAGES
 Safe, fairly efficient, good range
 Boon for the devices which uses midrange
power
 No need of line of sight.
 No need of power cables and batteries.
 Magnetic fields interact weakly with biological
masses (humans), and energy is only
transmitted between resonating objects
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19. DISADVANTAGES
 Transmissions possible only in few meters
 Possibility of “energy theft”
 Efficiency decreases with distance
 The resonance condition should be satisfied
and if any error exists, there is no possibility of
power transfer.
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20. WITRICITY CONCERNS
 Will it harm me?
 Will it harm the environment?
 Will it interfere with important
communication?
NO
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21. APPLICATIONS
 Direct Wireless Power—when all the power a device
needs is provided wirelessly, and no batteries are
required. This mode is for a device that is always used
within range of its WiTricity power source.
 Automatic Wireless Charging—when a device with
rechargeable batteries charges itself while still in use or
at rest, without requiring a power cord or battery
replacement. This mode is for a mobile device that
may be used both in and out of range of its WiTricity
power source
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22. APPLICATIONS
 Consumer electronics
 Transportation
 Industry applications
 Other applications
– Medical devices
– Military applications
– Robots
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23. REFERENCES
 http://en.wikipedia.org/wiki/WiTricity
 http://www.electricitybid.com/electricity/index.php/
 http://www.witricity.com/
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24. THANKING YOU
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25. Features and benefits
Witricity’s 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 into OEM
(original equipment
manufactures)products
Scalable design From Mw to kW
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26. Long Range Wireless Energy Transmission:
Microwave Power Transfer
Microwave Power Transfer (MPT) is a form of wave powerMicrowave Power Transfer (MPT) is a form of wave power
transfer that sends energy through air in the form oftransfer that sends energy through air in the form of
microwaves.microwaves.
MPT has a range miles longer than its inductive counterparts,MPT has a range miles longer than its inductive counterparts,
and it’s being investigated as a way to beam power to space.and it’s being investigated as a way to beam power to space.
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27. APPLICATIONS
Recently a Canadian program sent up SHARP (Stationary High
Altitude Relay Platform), a small unmanned aircraft powered
completely by energy beamed to it from the ground through
microwaves.
Solar Power Satellites (SPS) could also be an application for
MPT. Beaming solar energy collected from satellites or solar
panels on the moon to Earth could be a solution to our clean
energy issues.
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