wireless charging of mobile phones using microwaves

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.

PRINCIPLE OF OPERATION

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.

APPLICATIONS MOPAR WIRELESS HOME MOJO

CONCLUSIONNovel method of using “power of

microwaves”Can carry in case of “devoid facilities”

THANK YOU