WITRICITY

PRESENTED BY M.HEMADRI REKHA K.RAMYA II B.TECH, EEE II B.TECH, EEE 1310431 1310427

WIRELESS POWER Transmission of energy through the air. Process of transferring electric energy or

power over distance without wires. Also known as “WiTricity” and “ Wirelss

Power Transmission”. Eliminates the use of cables for

transmission of power.

History of Wireless Power

In 1899,Sir Nikola Tesla proposed a method of Wireless Power Transmission.

Tesla enlighten 200 lamps at the distance of 40 km. But only 15% efficiency was achieved.

As it is in Radiative mode , most of the Power was wasted and has less efficiency.

The Forgotten Invention is reborn in 2007 A group of

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

MIT powered 60 watt light bulb from 2 mts (7 ft) at 40% efficiency.

First practical example of Witricity.

How Wireless Power Works? 1.Magnetic coil is

housed in a box and can be set in wall or ceiling.

2.Antenna A, powered by mains ,resonates at a specific frequency.

3. Electromagnetic waves transmitted through the air.

4. Second magnetic coil (Antenna B) fitted in laptop/TV etc resonates at same frequency as first coil and absorbs energy.

Energy charges the device.

System Description

Working Principle One Simple Physics rule ! At source : Electricity => Magnetic Wave At Device : Magnetic Wave => Electricity

WIRE…. A BURDEN..

Batteries can be charged , it is just enough to place the device to top of one of these surfaces

WPT makes products:More Convenient:• no manual

recharging or changing batteries.

• Eliminate unsightly , unwieldy and costly power cords.

More Reliable• never run out of

battery power.• Reduces product

failure rates by fixing the “weakest link”.

Advantages Safe ,fairly efficient ,good range. Getting rid of great deal of

cables ! More secure , no risk of getting

shocked. Placed where you cannot have

physically cable ,solution wiTricity No wires. Need for battery is eliminated. Ewaste is eliminated.

Disadvantages wireless power transmission can be

possible only in few meters. Efficiency is only about 40%. Need for standardization and

adaptation. So a little over heating occurs because of different voltages.

Refitting old equipment or purchasing new equipment could become a very expensive endeavor.

Possibility of “energy theft”.

HOW SAFE IS WITRICITY Human beings or other objects

placed before the transmitter and receiver do not hinder 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.

ConclusionThink that the

city will be covered with WPT hotspots ,just like wireless internet there will be no need of charging batteries, or carrying adapters all around.