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WIRELESS POWER

TRANSFER

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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 & HISTORY2. INDUCTIVE RESONANCE COUPLING3. CONSTRUCTION &OPERATION4. APPLICATION & FUTURE

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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 .

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Why we need Witricity?.

WE USE WIRES…

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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. 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.

Rebirth in 2007 >>

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TYPES OF WITRICITYInductive Coupling

Resonant Inductive Coupling

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Inductive coupling

• Primary and secondary coils- not connected with wires.

• Energy transfer - due to Mutual Induction.

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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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Resonance Inductive Coupling(RIC)

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Combination of inductive coupling and resonance

Resonance makes two objects interact very strongly

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How resonance in RIC?Coil provides the inductanceCapacitor is connected parallel to

the coilEnergy 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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RIC VS. INDUCTIVE COUPLING 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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BASIC TECHNOLOGY :- WORKING CYCLE

Electricity

Magnetism

Electromagnetism

Magnetic Induction

Energy/Power Coupling

Resonance

Resonant Magnetic Coupling

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AIM OF THE CIRCUITS :-

1. •CONVERTION OF NORMAL FREQUENCY TO HIGH FREQUENCY

2. •CONVERTION OF INDUSED HIGH FREQUENCY TO NORMAL FREQUENCY

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CONVERTION OF LOW FREQUENCY INTO HIGH FREQUENCY :-

1. OSCILATOR

2. INVERTOR

3. INDUCTION COILS

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FIRST METHOD :-

USE OF OSCILATOR TO GENERATE A FIXED HIGH FREQUENCY

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SECOND METHOD :-

USE OF INVERTOR TO GENERATE REGULATED HIGH FREQUENCY

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THIRD METHOD :-

USE OF INDUCTION COIL WITH PROPER TUNING

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TRANSMITER CIRCUIT :- BY MULTISIM

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RECIVER CIRCUIT:- BY MULTISIM

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COMPLETE BLOCK DYGRAM:-

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Advantages of WITRICITY 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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Disadvantages 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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ApplicationsElectric automobile charging

Static and moving

Consumer electronics

Industrial purposes

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IN MEDICAL

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IN DEFENSE

eliminating the need for disposable batteries or a power cord connecting the helmet

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IN VEHICLES

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IN CONSUMER ELECTRONICS

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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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THANK YOU!