By Brian DsouzaEc - 8th sem

WITRICITY

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Contents:Why wireless power?Brief historyIntroductionWays of electricity transmissionIllustration of wireless electricityApplicationsFuture implicationsConclusion

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We Humans Love Electricity!

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And to power our electronic devices we buy:

40 million disposable batteries/yr !

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This is where it ends up:

Wire ... A burden...

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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.

A group of engineers at MIT came up with the idea to use resonant induction to transmit power wirelessly.

The forgotten invention is reborn in 2007

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Ways of Transmission

Near field 1. Induction

2. Resonant induction

Far field 1. Radio and microwave transmission

2. Laser

Basics

Witricity Basics

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Witricity BasicsResonance is the tendency of a system to oscillate with greater amplitude at some frequencies than at others.

Two conductors are mutual-inductively coupled when they are configured such that change in current flow through one wire induces a voltage across the ends of the other wire through electromagnetic induction.

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Basic Principle of Resonant Induction The basic principle involved in Witricity concept is two

coils having same resonating frequency tend to exchange maximum energy.

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Circuit Diagram of RIC

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Creating basic resonant induction circuitaryPrimary coil setup:

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The Secondary Coil:

•This circuit is one of the simplest you can ever create.

•It is composed of magnet wire coil but smaller than the primary, a capacitor also like the primary, and some leads you can attach things like LED.

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Effeciency chart of witricity

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Experimental results of MIT experiment

Increasing Range

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Advantages of this techniqueNo wires

Need for battery is eliminated

ewaste is eliminated

Maintenance cost is Saves

infrastructureless

Range can be increased

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Disadvantages of Resonant Wireless electricity:

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Distance constraint

Initial cost is high

In RIC, tuning is difficult

High frequency signals must be the supply

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How Safe is Witricity?

Human beings or other objects placed between the transmitter and receiver do not hinder the transmission of power.

Magnetic fields tend to interact very weakly with the biological tissues of the body, and so are not prone to cause any damage to any living beings.

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Wireless Electricity Applications In Immobile devices Cellphones , Tv’s , remotes Medical applications Industrial applications

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Charging Electric Car using WiTricity

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Future of Wireless Electricity

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Think that the city will be covered with WiTricity hot spots , just like Wireless Internet, there will be no need of charging batteries, or carrying adapters all around !

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Queries….

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