wireless mob charge

7/30/2019 Wireless Mob Charge

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Wireless Charging of Mobile Phones usingMicrowaves

Here is theSolution After InnovationBefore Innovation

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FUTURE GENERATION



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Mobile Phone Charging The New way

Always the recharging of mobile phone batterieshas always been a problem for us.

This problem will be solved after our

proposal!!!!!!!! We are going to add just a rectannae & a filter to

the ordinary mobiles during manufacturing time

Thus the more you talk, the more is your mobile

phone charged!!!!!!! This is new isnt?!!



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The Electromagnetic Spectrum

Hz M

Microwaves are good for transmitting information from one place toanother because microwave energy can penetrate haze, light rain and snow,

clouds, and smoke.www.freepptpresentation.com


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Shorter microwaves are used in remote sensing.

These microwaves are used for radar like theDoppler radar used in weather forecasts

Microwave radiation is still associated with energylevels that are usually considered harmless



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Microwave Region



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L

Band

S

Band

C

Band

X

Band

Ku

Band

K

Band

Ka

Band

Q

Band

U

Band

V

Band

1 to 2

GHz

2 to 4

GHz

4 to 8

GHz

8 to 12

GHz

12 to

18

GHz

18 to

26

GHz

26 to

40

GHz

30 to

50

GHz

40 to

60 GHz46 to

56

GHz

Microwave frequency bands

The frequency selection is another important aspect in transmission. Here we

have selected the license free 2.45 GHz(Industrial, Scientific and Medical)

ISM band for this purpose.



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TRANSMITTER DESIGN

The MAGNETRON is a self-contained microwave oscillator thatoperates differently from the linear-beam tubes, such as the TWTand the klystron.

Magnetron is used to produce high-power output required in radarand communications equipment

Microwaves used in mobile communication are also produced by

similar Oscillators



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Magnetron - Construction



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Whats rectannae you are

confused.its nothing butthe combination of rectifierand antenna..

Antenna is to receive themicrowave signal and it justfeed the signal to rectifier .

Rectifier is to convert the ACsignal to PULSATING DCsignal.

Top view Bottom view Antennae

WHATS RECTANNAE???



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RECEIVER DESIGN

The basic addition to the mobile phone is going to be the rectenna.

A rectenna is a rectifying antenna, a special type of antenna that isused to directly convert microwave energy into DC electricity.

A simple rectenna can be constructed from a schottky diode placedbetween antenna dipoles.

The diode rectifies the current induced in the antenna by the

microwaves.

Rectenae are highly efficient at converting microwave energy toelectricity. In laboratory environments, efficiencies above 90% havebeen observed with regularity.



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Entire System DesignDescription

This is our design which is going to be attached to the ordinary mobilesdesign



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Why Schottky diodes????

Schottky diodes can achieve greater switching speedsthan p-n junction diodes, making them appropriateto rectify high frequency signals.

Schottky diodes are made of single type of dopingmaterial, hence based of the major carrierconduction mechanism enabling high frequencyswitching.(Microwaves are of High Frequency)

P=0.6*1=0.6W(Other) P=1.1*1=1.1W(Schottky)though it consumes more power than any other, itsuits our application and provide higherefficiency(double).



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SENSOR CIRCUIT

In India the operating frequency of the mobile phoneoperators is generally 900MHz or 1800MHz forcommunication.

LM2907-a simple nF to V converter used as it operatesbetween this specified range , would serve our purpose.

F to V would act as switch to trigger the rectenna circuitto ON and the mobile phone begins to charge using themicrowave power automatically.

This is required, as the phone has to be charged as longas the user is talking.



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PROCESSING SECTION



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Conclusion

This novel idea minimises the tension of chargingyour mobile phones regularly.

No necessity of Chargers accompanying the mobilephone

Efficient use of energy transmitted in the form of

microwaves.



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Thank you

Queries????


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