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Wireless mobile charging through microwaves (2)

May 06, 2015



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2. Wireless Charging of MobilePhones Using MicrowavesBY,AYSWARYA.P.RS7 , EC13103437sist 2 3. THANKS TOSEMINAR COORDINATOR:DEEPA.V.T MINOSHIMA.MASST.PROFESSOR ASST.PROFESSOREC DEPT. EC DEPT.SEMINAR GUIDE:ANUPAMA.A.SASST.PROFESSOREC DEPT.3 4. CONTENTS INTRODUCTION WHATS HAPPENING MICROWAVE REGION FREQUENCY SELECTION BLOCK DIAGRAM TRANSMITTER SECTION RECEIVER SECTION ADVANTAGES DISADVANTAGES APPLICATION CONCLUSION4 5. INTRODUCTION Mobile phones becoming basic part of life Recharging of mobile phones is a big problem Objectiveto recharge any mobile phone independent ofmanufacturer and battery make Achieved by recharging battery while talking usingmicrowaves5 6. CONTD More you talk more the mobile get charged! No separate mobile charger Removal of talk time and battery stand by from mobilespecifications Additives to mobile handsets:SensorRectenna6 7. WHATS HAPPENING?Microwave signal is transmitted from transmitter alongwith message signal using slotted waveguide antenna atfrequency 2.45 GHzCharging made universal7 8. 8 9. MICROWAVE REGIONWavelength : 1 mm-30 cmMicrowave can be used for:1. Measuring body temperature2. Transmitting information3. Remote sensing4. RADAR5. Communication9 10. Microwave region ofelectromagnetic spectrumWe choose s band of microwave region(2-4GHz)Designation Frequency rangeL Band 1 to 2 GHzS Band 2 to 4 GHzC Band 4 to 8 GHzX Band 8 to 12 GHzKu Band 12 to 18 GHzK Band 18 to 26 GHzKa Band 26 to 40 GHzQ Band 30 to 50 GHzU Band 40 to 60 GHz10 11. FREQUENCY SELECTION Select license free 2.45 GHz Industrial, Scientific andMedical (ISM) radio bands ISM bands are reserved internationally for non-commercial use of RF electromagnetic fields forindustrial, scientific and medical purpose11 12. BLOCK DIAGRAM12 13. TRANSMITTER SECTIONConsists of two partsMagnetronSlotted waveguide antenna13 14. MAGNETRON Magnetron is a vacuum tube oscillator that generateshigh-power electromagnetic signals in the microwavefrequency range.14 15. Contd It is a microwave tube in which electrons generated from aheated cathode are affected by magnetic and electric fields toproduce microwave radiation Magnetron is used to produce high-power output required inradar and communication equipment15 16. SLOTTED WAVEGUIDE ANTENNA It is an Omni-directional antenna16 17. ContdSlotted antenna arrays used with waveguides arepopular antenna in navigation, radar and other high-frequency systemsHas high efficiency and gain of 13dB Here we use frequency of 2.45GHz17 18. RECEIVER SECTION Basic additions to mobile phonea. Sensorb. Rectenna18 19. SENSOR CIRCUITRY Simple circuit which detects whether the user is making acall Simple F to V converter, this would serve our purpose Operating frequency of mobile phone operators for GSMsystem for mobile communication in India is 900MHz or1800MHz Simple yet powerful F to V converter is LM290719 20. CONTD On the reception of the microwave signal ,the sensorcircuitry directs rectenna circuit to ON Rectenna circuit converts microwave energy to dc output Mobile phone begins to charge using the microwavepower as long as the user talks over cell phone.20 21. RECTENNA What is Rectenna ? Rectenna = Rectifier + Antenna.21 22. Contd Rectenna is a rectifying circuit that converts microwaveenergy into DC output. Single Rectenna is approx 23 mm2 , arranged to form anarray suitable to the shape of mobile phone. Very thin as sheets and can be used at the back of the Cellphones In our design it consists of a single diode power rectifierin hybrid technology with improved sensitivity at lowpower levels.22 23. RECTIFYING CIRCUIT The Schottky diode microwave rectifying circuit is usedhere as its efficiency is found to be greater than 90%. To make low cost power rectifier for low and high powerlevels of 2.45GHz with good efficiency of rectifyingoperation Used to improve transmission efficiency23 24. ADVANTAGES Charging mobiles wirelessly Saving time for charging Wastage of power is less Better than witricity Get charged as we make call during long journey24 25. DISADVANTAGES Radiation problems may occur Network traffic may cause problems in charging Charging depends on network coverage Rate of charging may be of minute range25 26. APPLICATIONSAs the topics name itself it is used for WIRELESS CHARGING OF MOBILE PHONES26 27. FUTURESCOPE & CONCLUSION Thus this paper successfully demonstrates a novel methodof using the power of microwave to charge mobile phoneswithout use of wired chargers. It provides great advantage to mobile phone users tocarry their phones anywhere even if the place is devoidof facilities for charging. Has effect on human beings similar to that from cellphones at present.27 28. Contd Use of rectenna and sensor in mobile phone could providenew dimension in the revolution of MOBILE POWER28 29. REFERENCES Theodore.S.Rappaport , Wireless CommunicationsPrinciples and Practice www.wikipedia.org29 30. 30 31. Any questions????31

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