wirelesspowertransmission

8/20/2019 wirelesspowertransmission

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WIRELESS

POWER

TRANSMISSION

BY,

DHANSHA THAKURANIRUDH K.N

GEETHU KRISHNAKUMAR

JITHU NAIR


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INTRODUCTION

• Wireless power transfer can makeelectronic devices like cell phones,household robots, mp3 players,

laptop computers and other portableelectronics wire-free.

• Resonant inductive coupling which is

one of the various power transmissiontechniques is demonstrated here.


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ABSTRACT

• Many researchers have developed severaltechniques for moving electricity over longdistances without wires.

• Witricity is based upon coupled resonantobects.

• !wo obects having same resonatingfrequency and in magnetic resonance tendto e"change energy, while dissipatingrelatively little energy to the e"traneouso#-resonant obects.


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RESONANT INDUCTIVE COUPLING

• $nductive charging usesan electromagnetic &eld to transfer energybetween two obects.

• 'reater distances can be achieved byusing resonant inductive coupling.

• Resonant inductivecoupling or electrodynamic induction isthe near &eld wirelesstransmission between two coils that aretuned to resonate at the same frequency.


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• !he capacitor and inductor forms the resonator.

(harge oscillates between inductor )as magnetic

&eld* and capacitor )as electric &eld.*

• !his type of oscillation is called resonance if the

reactance+s of the inductor and capacitor are

equal.


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• Resonant transfer works by making acoil ring with an oscillating current.

• !his generates an oscillating magnetic &eld.

•

ecause the coil is highly resonant any energyplaced in the coil dies away relatively slowly

over very many cycles.

•

ut if a second coil is brought near it, the coilcan pick up most of the energy before it is lost,

even if it is some distance away.


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BLOCK DIAGRAM


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BLOCK DIAGRAM

• scillator used is an astable multivibratorusing timer which switches $R/012 toproduce oscillations in the primary coil.

• econdary coil kept at a distanceresonates at the same frequency andpower transfer takes place.

• ignal received in the secondary isrecti&ed and regulated.


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CIRCUIT DIAGRAM


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PRIMARY CIRCUIT


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PRIMARY CIRCUIT

• scillator is an astable multivibrator using timer a rectangular-wave generating circuit.

• 4 pot connected between the 5 and 6 terminals

of the timer is adusted to tune the primary andsecondary coils at the same resonatingfrequency.

• !he astable multivibrator causes an $R/012transistor to undergo switching to produceoscillations of required strength.

• 4 primary coil made of 7 turns of a magneticwire is connected to $R/012


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SECONDARY CIRCUIT


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SECONDARY CIRCUIT

• 4 coil of same dimensions as that of theprimary is connected in the secondarycircuit.

•4n M80 capacitor of 9 is connected to thecoil to form an oscillating tank circuit.

• 4n :;< can be glown even using 4( beforeusing the recti&er stage.

• 4( voltage is recti&ed using a =/>226 fastrecti&erand smoothened using a &ltercapacitor.

•


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PRIMARY PCB LAYOUT


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PRIMARY COMPONENT LAYOUT


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SECONDARY PCB LAYOUT


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SECONDARY COMPONENT LAYOUT


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APPLICATIONS

• 0rovides charging stations forhandheld devices like phonese"?powermat, removes the need for

multiple power sockets

• (an operate appliances like tv

• ;lectric car manufacturers consider it

for charging electric cars, currentlyusing wires for this purpose is notentirely practical


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ADVANTAGES

• @on-radiative energy transfer is safefor people and animals.

• Wastage of power is less.

• Aighly resonant strong couplingprovides high eBciency overdistance.

•


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CONCLUSION

• Wireless power transfer is quicklybecoming a viable reality.

• !his technology o#ers an e"tremelyeBcient alternative to previousattempts at providing wireless power.

• /uture improvements in wireless

technology o#er world changingimplications.

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wirelesspowertransmission