PowerPoint Presentation

WIRELESS POWER TRANSMISSION

By:Hafiz Hussain(2012119)Hassan Raza(2012143)Junaid Ahmad(2012159)Khawaja Zain(2012161)

IntroductionTransmission and distribution losses

Loss of energy generated in wires

Nicola Tesla

2History of Wireless Power

In 1899, Sir Nikola Tesla Proposed a method of Wireless Power Transmission. He enlighted 200 lamps at the distance of 40 km, Wirelessly !

Nikola Tesla The GeniusColorado springs experiment

Earth current transmissionWireless TowerCharged by high frequency and high voltage apparatusHigh frequency AC Current dischargedConduction, Earth surface shellTesla CoilElectrical resonant transformer circuitHigh frequency output illuminates fluorescent tubes

The forgotten invention is reborn in 2007RESONANCE COUPLING

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

Resonance", a phenomenon that causes an object to vibrate when energy of a certain frequency is applied.Experiment demonstrated at MIT.A 60W light bulb lit from source at a distance of 2m from load.

What is WPT ?definition is : Transmission of energy through the air.A system of two electromagnetic resonators coupled mostly through their magnetic fields.

Types of WPTNear-field techniquesInductive CouplingResonant Inductive CouplingAir Ionization

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

8Inductive coupling Primary and secondary coils- not connected with wires.Energy transfer - due to Mutual Induction.

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Resonance Inductive Coupling(RIC)Same concept as Inductive coupling just that the coils operate at resonant frequency leading to efficient transfer of energy over a larger distance. Interacts weakly with extraneous off resonant objects.Radiation loss will be negligible

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Resonant Inductive Coupling

Air IonizationToughest technique under near-field energy transfer techniquesAir ionizes only when there is a high fieldNeeded field is 2.11MV/mNatural example: LighteningNot feasible for practical implementation.

Microwave Power Transmission (MPT) SPS Idea proposed by Petel Glaser in 1968 Satellite in Geosynchronous Orbit

Microwave Power Transmission (MPT)Microwaves produced at 2.45 GHz by using MagnetronRectenna is used for collecting these Microwaves (One and half mile long) Rectenna converted these Microwaves in DC power with antenna and rectifierThrough this type of Power Station, we can get 5 to 10 G-Watts power.Power efficiency up to 85%.5,000 MW Receiving Station (Rectenna).This station is about a mile and a half long.

Laser Power Transmission

Energy conversion solar energy to concentrated light energy electrical energy. Laser Power TransmissionLong distance transmission possible.Solar energy- Not a concentrated source of energy.Losses due to scattering of light.Presently only 3% of solar energy is being utilized.High efficiency about 50% to 75%.With this technology it is expected 1GW of power can be generated.

19ApplicationsIn Electric AutomobilesApplicationsDirect Wireless PowerNo device needs wiresFor TVs, toasters or any form of Immobile devices

Automatic Wireless Charging PadDevice with rechargeable batteriescharges itself Criteria: Close Contact

WPT CONCERNSWill it harm me?Will it harm the environment?

NONo wiresNo Energy-waste as compared to dumped used batteriesNeed for battery is eliminatedMaintenance cost is less22Advantages of WPTDistance constraint

23Disadvantages

Initial cost is highIn RIC, tuning is difficult(L & C Values for Resonance)Air ionization technique is not feasible( small distance, High voltage, )24Disadvantages

CONCLUSION Transmission without wires- a realityEfficient (MIT experiment more than 60%)Energy crisis can be decreasedIn near future, world will be completely wireless

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