Wireless Power Transfer and Witricity

WIRELEES POWER TRANSFER

OVERVIEW

INTRODUCTIONWHY WPT(WIRELESS POWER

TRANSMISSION) ?TECHNIQUES OF WPTAPPLICATIONS OF WPTMERITS AND DEMERITSFUTURE SCOPE AND MARKETCONCLUSION

INTRODUCTIONWHAT IS WITRICITY :The transmission of

energy from one place to another without using wires.

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

The 187 feet tall tower to broadcast energy

But due to Shortage of fund the tower did not operate

Tesla towerLight up 400 bulbs

WHY WPT ?Reliable

Efficient

Fast

Low maintenance cost

Can be used for short-range or long-range.

TYPES AND TECHNOLOGIES OF WPTNear-field techniques

Inductive CouplingResonant Inductive CouplingAir Ionization

Far-field techniquesMicrowave Power Transmission (MPT)LASER power transmission

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Short range – INDUCTIVE COUPLING, AIRIONIZATION Medium range – RESONANT INDUCTIVE COUPLING

Long range power transfer - MICROWAVE POWER AND LASER TRANSMISSION

For the application of

INDUCTIVE COUPLINGPrimary and secondary coils are not

connected with wires.Energy transfer is due to Mutual InductionTransformer is a basic example for induction

process

Resonance Inductive Coupling(RIC

The capacitor and inductor forms the resonator. Charge oscillates between inductor (as magnetic field) and capacitor (as electric field.)This type of oscillation is called

resonance if the reactance's of the inductor and capacitor are equal.

Capacitor is connected parallel to the coilEnergy will be shifting back and forth

between magnetic field surrounding the coil and electric field around the capacitor

Block diagram

MICROWAVE POWER TRANSFERIn this method Electrical energy is converted to

microwave energy.

AC is converted to DC first then this DC is converted to microwaves using MAGNETRON.

This wave is Captured using RECTENNA and convert Microwave energy to electrical energy.

This Method is used where transfers high power from one place to another being in line of sight usually.

Solar Power Satellite

Power beaming using microwaves has been proposed for the transmission of energy from orbiting solar power satellites to Earth

RECTENNA in US receives 5000MW of power from SPS

Stands for rectifyingAntenna Converts microwaveto its DC equivalent MAGNETRON

LASERSIn the case of electromagnetic radiation

closer to visible region of spectrum ,power can be transmitted by converting electricity into a laser beam that is then pointed at a solar cell receiver.

LASER is highly directional, coherentNot dispersed for very longSimple receiver

Photovoltaic cellCost-efficientBut, gets attenuated when it propagates

through atmosphere

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Is WiTricity Secure ?Principle is based on Magnetic Waves. The question is if Magnetic Waves

Secure ?The answer is we all live in a globe that has

already surrounded by magnetic waves.

Yes it is secure !

APPLICATIONS OF WPTNear-field energy transfer

Electric automobile charging Static and moving

Consumer electronicsIndustrial purposes

Harsh environmentFar-field energy transfer

Solar Power SatellitesEnergy to remote areasCan broadcast energy globally (in future)

DOMESTIC POWER APPLICATIONS

Wireless Parking Charger

EEE NMIT 2014 20

Defense Systems

Photographs showing several military applications for highly resonant wirelesscharging systems: military robots (left) and soldier electronics (right).

MERITSEliminates the existing transmission line cables, towers and

sub stations

More freedom of choice of both receiver and transmitters

Cost of transmission and distribution become less.

Power could be transmitted to the places where the wired transmission is not possible.

Loss of transmission is negligible level.

Safer by eliminating the sparking hazard.

DEMERITSThe Capital Cost for practical implementation of WPT

seems to be very high.

Interference of microwave with present communication systems

Common belief fears about the effect of microwave

radiation among peoples

When LASERs are used, conversion is inefficient Absorption loss is high

FUTURE SCOPE AND MARKETThink that the city will be covered with WiTricity

hot spots like wi-fi.which eliminate need of charging batteries or

carrying adapters all around !Transport system become wirelessly powered which eliminate fuel engines.

Which will give rise to the Robotic Technology they will work for us 24 H 365 days without any

failure.

CONCLUSIONMore reliable than ground based solar power.

If we develop this ,we need not bother about the exhaustion of natural resources.

Transmission without wires- a reality

Low maintenance cost. But, high initial cost

Low energy wastage

In near future, world will be completely wireless