PRESENTED BY :SONU KUMAR1313703MMICT & BM

CONTENTS….

Need of Witricity

History of wireless power

Types of Wireless Energy Transfer

Applications of Witricity

What do you mean by WiTricity ?

Advantages & Disadvantages

Conclusion

References

What is Witricity ?

WiTricity technology istransferring electric energy orpower over distance withoutwires, with the basics ofelectricity and magnetism.

The Transfer of Electricity fromone place to another withoutwires is known as “WiTricity”.

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.

In the year 1891,Nikola Teslaproposed the method ofwireless transmission of ElectricPower

One of the greatest breakthroughs of science at that time

It Began to Construction in 1901 inNew York and Shut Down by 1905,Built the wardenclyffe tower whichcould broadcast power wirelesslyusing far-field techniques. Called offas it radiated power intosurroundings raising issues ofpower lossPower theftHealth concerns

A dream crashes……

The Witricity Team

In 2007,6 MIT members headedby Marin Soljacic were able tosuccessfully transmit power to abulb within a distance of 2m at afreq of 9.9MHz using conceptsof non radiative mid rangeenergy transfer .Resonanceinductive couplingEfficiency at that point was just approximately 43%

Types of wireless energy transfer techniques are:-

Short range– Inductive coupling

Mid range– Resonance Inductive coupling

Long range-Microwave Transmission

Uses electromagnetic inductionconcept for the interdependenceof time-varying electric andmagnetic fields.

Wireless electricity makes use of the concept-“Oscillating electric field producesmagnetic field and oscillatingmagnetic field produces electricfield”.

Resonant Inductive Coupling

Uses almost the sameconcept as Inductivecoupling just that the coilsoperate at resonantfrequency leading toefficient transfer of energyover a larger distance.

Microwave Transmission

Aims at higher power transfer over longerdistances practically in the range of some miles.

Requires a microwave source, antenna andreceptor.

operates in the frequency range of 1-40GHz.operates at the highest efficiency at 2.45GHz.Steps:

1.conversion of electrical to microwave energy,2.Capturing of microwave beams by Receptor.3.conversion of microwave to electrical energy.

Block diagram for microwave power transmission model

Block diagram for witricity mechanism

Circuit diagram for WiTricity demonstration

Wireless electricity in our daily life

Efficiency chart of witricity

It is observed that efficiency decreases with increase in distance between source coil and load coil

Applications of Witricity (short range and mid range)

1.DIRECT WIRELESS POWERNo device would need wiresFor TVs, toasters or any form of immobile electronic devices.

2. AUTOMATIC WIRELESS CHARGINGDevice with rechargeable batteries charges itself.For any form of mobile devices .3.INDUSTRIALwould be free of heavy installation of wires and devoid of any hazardous electric shock incidents.4.TRANSPORTATIONCould charge an electric car or automobile.

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.

Wireless power transmission and reception using microwaves

Advantages:

Disadvantages:

1. Efficient and reliable power.2. Creation of a shock free environment.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 EMI is also a concern.

Prospects & Issues:

Conclusion:

WiTricity, if successful will definitely change the way we live. Imagine cell phones, laptops, digital camera's getting self charged! Engineers have got job on hand to research and commercialize the technology. Till then, it is a wait in anticipation.

From the discussion its clear that this idea needs awareness toremove doubts from minds of the people about safety issues.It requires both support from government and the peoplefinancially and psychologically.

References:

•An article published in the Science Magazine as “Wireless Power Transfer via

Strongly coupled magnetic fields ”

•“Efficient Non-Radiative Midrange Energy Transfer” by Aristeidies karalis,

Marlin Soljacic,2006.

• http://ieeexplore.ieee.org/Xplore/

•www.WiTricity.com

•www.WiTricitypower.com

•www.techjournal.com

•www.wikipedia.org

•http://www.sciencedirect.com/science/journals