The document discusses wireless electricity or Witricity. It provides a brief history of wireless power starting from Nikola Tesla's proposals in 1899. It then describes two types of wireless power transfer - inductive coupling and resonant inductive coupling (RIC). RIC uses resonance to achieve greater efficiency and range over inductive coupling. The document outlines the working of wireless power transfer circuits in transmitters and receivers. It discusses applications of wireless power in electric vehicles, consumer electronics, and medical devices. Benefits include eliminating wires and batteries, while challenges include initial costs and tuning issues.

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2. PRESENTED BY:-
M.SAI TEJA (14161-EE-042)
E.KUMAR (14161-EE-015)
S.SAI KIRAN(14161-EE-039)
SUBMITTED TO:-
SINGARENI COLLIRIES POLYTECHNIC
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CONTENTS :-
1. INTRODUCTION & HISTORY
2. INDUCTIVE RESONANCE COUPLING
3. CONSTRUCTION &OPERATION
4. APPLICATION & FUTURE

4. What is WitriCity?
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Witricity is nothing but wireless electricity.
Transmission of electrical energy from one
object to another without the use of wires is
called Witricity.
Because of Witricity some of the devices
won’t require batteries to operate .

5. Why we need Witricity?.
WE USE WIRES…
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6. History of Wireless Power:
 In 1899, Sir NikolaTesla Proposed a method
ofWireless Power Transmission.
 As it is in Radiative mode, most of the Power
was wasted and has less efficiency.
 Able to light lamps over 25 miles away
without using wires
The team from Massachusetts
Institute of Technology, who call
their invention ‘WiTricity‘.
In the first successful trial of its
kind, the team was able to
illuminate a 60-watt light bulb 7ft
away.
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7. TYPES OF WITRICITY
Inductive Coupling
Resonant Inductive Coupling
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8. Inductive coupling
• Primary and secondary coils- not connected
with wires.
• Energy transfer - due to Mutual Induction.
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9. Inductive coupling (contd…)
• Transformer is also an example
• Energy transfer devices are usually air-cored
• Wireless Charging Pad(WCP),electric brushes
are some examples
• On a WCP, the devices are to be kept, battery
will be automatically charged.
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10. Resonance Inductive
Coupling(RIC)
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 Combination of inductive coupling and
resonance
 Resonance makes two objects interact very
strongly

11. How resonance in RIC?
 Coil provides the inductance
 Capacitor is connected parallel to the
coil
 Energy will be shifting back and forth
between magnetic field surrounding
the coil and electric field around the
capacitor
 High resonant frequency
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12.  RIC is highly efficient
 RIC has much greater range than inductive
coupling
 RIC is directional when compared to
inductive coupling
 RIC can be one-to-many. But usually
inductive coupling is one-to-one
 Devices using RIC technique are highly
portable
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13. BASIC TECHNOLOGY :-
WORKING CYCLE
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Electricity
Magnetism
Electromagn
etism
Magnetic
Induction
Energy/Pow
er Coupling
Resonance
Resonant
Magnetic
Coupling

14. AIM OF THE CIRCUITS :-
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1.
• CONVERTION OF NORMAL
FREQUENCY TO HIGH
FREQUENCY
2.
• CONVERTION OF INDUSED
HIGH FREQUENCY TO
NORMAL FREQUENCY

15. CONVERTION OF LOW FREQUENCY
INTO HIGH FREQUENCY :-
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1. OSCILATOR
2. INVERTOR
3. INDUCTION COILS

16. FIRST METHOD :-
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USE OF OSCILATOR TO GENERATE A FIXED HIGH
FREQUENCY

17. SECOND METHOD :-
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USE OF INVERTOR TO GENERATE REGULATED HIGH
FREQUENCY

18. THIRD METHOD :-
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USE OF INDUCTION COIL WITH
PROPER TUNING

19. TRANSMITER CIRCUIT :- BY MULTISIM
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20. RECIVER CIRCUIT:- BY MULTISIM
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21. COMPLETE BLOCK DYGRAM:-
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22. No wires
Need for battery is eliminated
 No e-waste
Efficient energy transfer
Harmless, if field strengths under safety
levels
Maintenance cost is less
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23. Distance constraint
Field strengths have to be under safety
levels
Initial cost is high
In RIC, tuning is difficult
High frequency signals must be the supply
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24.  Electric automobile charging
 Static and moving
 Consumer electronics
 Industrial purposes
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25. IN MEDICAL
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eliminating the need for disposable batteries or
a power cord connecting the helmet

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28. IN CONSUMER ELECTRONICS
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29. Conclusion
• Transmission without wires is possible
• Efficient
• Low maintenance cost. But, high initial cost
• Better than conventional wired transfer
• Energy crisis can be decreased
• Low loss
• In near future, world will be completely wireless
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