1. Presented by,
ALBERT JOSEPH
Amal Jyothy College of Engineering
Kanjirappally
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2.  Introduction.
 Need of witricity.
 Working principle.
 Safety of witricity.
 Benefits and advantages.
 Limitations.
 Conclusion.
 References.
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3.  Wireless electricity.
 Transmission of electrical energy from one object to
another without the use of wire.
 we can avoid the use of batteries in some devices.
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Fig 1
Fig 2

5. This is the situation…
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Fig 3
Fig 4

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Fig 5

7. Why not wires??
•Most electrical energy transfer is through wires.
•Most of the energy loss is during transmission.
•On an average, more than 30%
•In India, it exceeds by 40%
Why not batteries??
Estimated that 40 billion batteries per year add to the e-
waste burden.
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8. Wardenclyffe tower(Tesla tower)
which could broadcast power
wirelessly using far-field
techniques. Called off as it
radiated power into surroundings
raising issues of power loss
Power theft Health concerns
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Fig 6
Fig 7.Tesla tower
History…

9. History contd…
• The forgotten invention is reborn in 2007
• The idea of wireless electricity has been around since the
early days of the Tesla coil.
• Group of MIT scientists, change the concepts in to reality.
• In 2007,6 MIT members headed by Marin Soljacic were able
to successfully transmit power to a bulb within a distance of
2m at a freq of 9.9MHz .
• They use concepts of non radiative mid range energy transfer,
Resonance, inductive coupling.
• Efficiency at that point was just approximately 43%.
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10. 10Fig 8

11. Principle
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.
11Fig 9.Principle of witricity

12. How WiTricity works
1) Power from mains to antenna, which is made of
copper.
2) Antenna resonates at a frequency of 10MHz, emitting
electromagnetic waves.
3) 'Tails' of energy from antenna 'tunnel' up to 2.5m (8.2ft).
4) Electricity picked up by laptop's antenna, which must also be
resonating at 10MHz. Energy used to re-charge device.
5) Energy not transferred to laptop re-absorbed by source
antenna. People/other objects not affected as not resonating at
10MHz.
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Fig 10

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Fig 11(www.witricity.com)

14. Is WiTricity Technology safe?
•WiTricity’s technology is a non-radiative mode of energy
transfer, relying instead on the magnetic near field.
•Magnetic fields interact very weakly with biological
organisms—people and animals—and are scientifically
regarded to be safe.
•WiTricity products are being designed to comply with
applicable safety standards and regulations.
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15. WiTricity Applications Consumer Electronics
• Automatic wireless charging of mobile electronics in home,
cars, offices.
• Mobile phones, Laptops, Game Controller etc.
Industrial Applications
• Direct wireless power and communication interconnections at
points of use in harsh environments.
• In Drilling, Mining, Underwater etc.
Transportation
• Automatic wireless charging for existing electric vehicle
classes.
• In Golf carts, Cars etc.
Other Applications( Medical devices, Military applications and
Robots)
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16. Advantages
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
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17. •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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18. Limitations
•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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19.  WiTricity is the modern way of power transmission
which can reduce transmission cost, pollution,
transmission loss etc.
 It can be used efficiently in many fields like automobile,
agricultural, domestic needs etc.
 Its efficiency decreases as the distance increases and
possibility of energy theft was there.
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20. References
• S. Sheik Mohammed, K. Ramasamy, T.
Shanmuganantham,” Wireless power transmission – a
next generation power transmission system”, International
Journal of Computer Applications (0975 – 8887)
• An article published in the Science Magazine as “Wireless
Power Transfer via Strongly coupled magnetic fields ”
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•Mohammad Yasir,Md.Shakibul Haque-The Witricity:
Revolution in Power Transmission Technology(2229-5518)
•Ajey Kumar ,Gayathri ,Bette Gowda,Yashwanth-
Witricity:Wireless Power Transfer By Non-radiative Method
(2231-5381)

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• Fabian Kley, Christian Lerch, David Dallinger-New
business models for electric cars-A holistic
approach(3392-3403)
• www.witricity.com
• www.Wikipedia.com

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