WIRELESS CHARGING OF MOBILE PHONES USING MICROWAVES
S.NEERAJ REDDY09L71A0417
SEMINAR PRESENTED BY
CONTENTSOVERVIEWINTRODUCTIONMICROWAVESTRANSMITTER DESIGNRECEIVER DESIGNWORKING PRINCIPLESENSOR CIRCUITRYAPPLICATIONSCONCLUSION
OVERVIEWAutomatic recharging of the mobile phones.Use of microwaves.Slotted wave guide antenna.Sensor, a “Rectenna”, and a filter to the mobile handset.Need for separate chargers for mobile phones is
eliminated.
INTRODUCTIONElectromagnetic
spectrumThree physical properties
MICROWAVES
Electromagnetic waves. Frequency range .3GHz – 300GHz. Remote sensing. Communication industry. Different bands. 2.45 GHz ISM band
TRANSMITTER OUTER DESIGNHigh power
microwave oscillator
Special kind of vacuum tube
Efficiency 50 to 80 %
TRANSMITTER INNER DESIGN
Uses CROSSED-ELECTRON & MAGNETIC fields
RECEIVER DESIGN Rectenna Constructed from a schottky diode placed between antenna dipoles.Microwaves are received with about 85% efficiency at 2.45GHz.
WORKING PRINCIPLERectifying circuit.Different from a
common P/N silicon diode.
Power consumption.Very low noise index.
SENSOR CIRCUITRYDetects if the mobile
phone receives any message signal.
900MHz or 1800MHz for the GSM system.
LM2907 (F TO V Converter).
Acts as a switch
ADVANTAGESNeed for separate chargers for mobile phones is
eliminated.Charges “anywhere anytime” within the location of
waves.
CONCLUSIONNovel method of using “power of
microwaves”Can carry in case of “devoid facilities”
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