This document discusses the history and techniques of wireless electricity transmission. It begins with defining witricity as the transmission of energy through the air without wires. It then reviews the early attempts by Nikola Tesla in the late 1800s and discusses the main techniques of inductive coupling, resonant inductive coupling, and microwave transmission. Applications including charging electric vehicles and devices wirelessly are demonstrated. While wireless power has advantages like more efficient and reliable power access, challenges remain in frequency tuning for short-range methods and potential health impacts of long-range microwave transmission. The conclusion is that a completely wireless world for energy transmission will likely be realized in the near future.

1. WIRELESS ELECTRICITY
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BY
G MANASA
NANCY SINHA

2. In this paper....
1) What do you mean by Witricity ?
2) Need of Witricity.
3) History of wireless power.
4) Techniques to Transfer
5) Application , Pros and cons.
6) Future and conclusion.
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3. What is Witricity ?
Obvious definition is :
“Transmission of energy through the air”
Cables are going to replaced by WiTricity
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4. Why do we need wireless
electricity???
The need of electricity in every nook and
corner of the world
The demand of eco-friendly power
Requirement of efficient and reliable power
To reduce dependence on wires and batteries
The ever increasing power demand
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5. Wireless electricity way
back in the 1800s……..
In the year 1891,Nikola Tesla
proposed the method of
wireless transmission of electric
power
One of the greatest breakthroughs
of science at that time
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6. Built the wardenclyffe 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
The Wardenclyffe Tower
A dream crashes……
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7. Types of wireless energy transfer
techniques are:-
Short range-Inductive
Coupling
Mid range-Resonance
Inductive Coupling
Long range –Microwave
Transmission
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8. INDUCTIVE COUPLING
•Uses Electromagnetic Induction concept
•Primary and secondary coils are not connected
with wires.
•Energy transfer is due to Mutual Induction
•This method works only when receiver is in
close proximity to the transmitter
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9. Inductive coupling
•Uses Electromagnetic Induction concept
“Oscillating electric field produces magnetic field and
oscillating magnetic field produces electric field”.
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10. Resonant Inductive Coupling
Uses almost the same
concept as Inductive
coupling just that the coils
operate at resonant
frequency leading to
efficient transfer of energy
over a larger distance
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11. Different Frequency
Resonance
Property of systems to operate at higher amplitudes at particular
frequencies known as resonant frequencies than at others.
When 2 objects operate at same resonant frequency they transfer energy
efficiently between them without interfering with the off resonant objects.
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12. Different Frequency
The glass which was having the resonant frequency
as of the singer’s voice accumulated sufficient
energy to explode eventually
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13. Different Frequency
The glass which was having the resonant frequency
as of the singer’s voice accumulated sufficient
energy to explode eventually
The setup powered the bulb even when coils
were not in line of sight .The bulb glowed even
when wood, metal and other devices were
placed in between the coils
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14. Microwave Transmission
→Aims at higher power transfer over longer distances
practically in the range of some miles
→Requires a microwave source, antenna and rectenna.
→Steps:
1.conversion of electrical to microwave energy
2.Capturing of microwave beams by Rectenna
3.conversion of microwave to electrical energy
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15. SOLAR POWER SATELLITES:
The most imp. Application or advancement:
→absorb light energy from sun.
→converted to electric energy and beamed to earth stations in form of
microwave beams
→so it can power satellites,aircrafts,even supply electricity to places
where wired connections are not possible at lower prices.
Applications of long range transmission
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16. Image of a Rectenna in US with diameter of about half a mile
which is important as 95% of the microwave power is received
by rectennas.US receives about 5000MW of power as a result.
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17. Applications
Demo 1:
Charging Electric Car using
Witricity.
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18. Demo 2:
Charging the mobiles and laptops using
POWERMAT
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19. Advantages:
Disadvantages:
1. Efficient and reliable power.
2. Creation of a shock free environment devoid of any chances
of power thefts.
3. Provides solution to the ever increasing demand for power.
4. A solution to reduce e-waste- a more safe environment.
5. A more cost effective methodology for getting electricity to
your houses which includes paying less for use of power.
1.For short and mid range transfer system has to be set at the
right frequency or there would be no power transfer.
2.For long range the installation cost is high while the
microwaves will cause harmful effects to the human.
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20. Future and Conclusion
•Transmission without wires- a reality
•Energy crisis can be decreased
•In near future, world will be completely wireless
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