Chandan verma seminar
- 1. Powerpoint Templates Page 1 Presented By Chandan Verma 2012UGEC014
- 3. Powerpoint Templates Page 3 Contents Introduction Transmitter design Receiver design Rectification antenna Schottky diode Sensor circuitry Advantages and Disadvantages Conclusion Future scope
- 4. Powerpoint Templates Page 4 Introduction The mobile can be charged at any time, anywhere. The microwaves are used to charge the mobile phones.
- 5. Powerpoint Templates Page 5 The Electromagnetic Spectrum The light travels with the speed of 3*10^5 km/sec
- 6. Powerpoint Templates Page 6 The Microwave Region The license free 2.45 GHz ISM band is been selected for the purpose of this experiment. The 2.45GHz lies in between 2GHz to 4GHz which is the S band shown below.
- 7. Powerpoint Templates Page 7 Transmitter Design Magnetron Magnetron is high power microwave oscillator. Efficiency of this high power oscillator lies between 50% and 80%.
- 8. Powerpoint Templates Page 8 Self contained microwave oscillator (magnetron)
- 9. Powerpoint Templates Page 9 Receiver design An additional feature to the mobile is RECTENNA. RECTENNA ïƒ Rectification + Antenna Transmitting station with the microwave transmitter sensor Rectenna RT cable circulator waveguide Slotted waveguide Antenna mobile signal
- 10. Powerpoint Templates Page 10 Process of Rectification Directly converts the microwave signal into DC power. The efficiency is up to 90% in laboratory environments.
- 11. Powerpoint Templates Page 11 Schottky diode A Schottky barrier diode -- majority carrier device Common diode -- minority carrier device. Its reverse recovery time Trr is very short and shorter than 10 nS. The forward voltage bias of the Schottky barrier diode is under 0.6V. This is a comparatively ideal diode, such as for a 1 ampere limit current PN interface. P=0.6*1=0.6W ïƒ Schottky diode P=1.1*1=1.1W ïƒ common diode Power comparison between common diode and Schottky diode
- 13. Powerpoint Templates Page 13 Sensor circuitry The sensor circuitry is a simple circuit, which detects if the mobile phone receives any message signal.  In India the operating frequency of the mobile phone operators is generally 900MHz or 1800MHz for the GSM system for mobile communication.
- 14. Powerpoint Templates Page 14 Advantages Wireless energy transfer can potentially recharge the mobile phones without chords.  Only one microwave transmitter can serve to all the service providers in that area. The need of different types of chargers by different manufacturers is totally eliminated.
- 15. Powerpoint Templates Page 15 Disadvantages The transmitter and receiver also should be very powerful devices as the distance increases.  Wireless transmission of the energy causes some drastic effects to human body, because of its radiation.  Practical possibilities are not yet applicable as there is no much advancement in this field.
- 16. Powerpoint Templates Page 16 Conclusion  A novel method of using the power of the microwave to charge the mobile phones without the use of wired chargers.  This method provides great advantage to the mobile phone users to carry their phones anywhere even if the place is devoid of facilities for charging.
- 17. Powerpoint Templates Page 17 Future scope  The wireless charging can even be done using the data exchange as now only its only been implemented for voice calls.  With the advent of nanotechnology and MEMS the size of these rectennas can be brought down to molecular level. It has been theorized that similar devices, scaled down to the proportions used in nanotechnology, could be used to convert light into electricity at much greater efficiencies than what is currently possible with solar cells. This type of device is called an optical rectenna.