WIRELESS MOBILE CHARGING USING MICROWAVE
- 1. WIRELESS CHARGING OF MOBILE PHONES USING MICROWAVES NAJMUL HOQUE MUNSHI College - KGEC M.TECH (1st Year) ECE Department ROLL NO - 17 9/28/2018 1
- 2. CONTENTS • Introduction • Types of Wireless Charging • Why wireless charging using microwave • The Electromagnetic Spectrum • Frequency Selection • General Block Diagram • Transmitter Section • Receiver Section • Advantages • Disadvantages • Future of Wireless Power • References 9/28/2018 2
- 3. 9/28/2018 3 Introduction Fig 1 : Evolution of Mobile charging
- 4. 9/28/2018 4 INDUCTIVE CHARGING RADIO CHARGING RESONANCE CHARGING TYPES OF WIRELESS CHARGING
- 5. 9/28/2018 5 WHY WIRELESS CHARGING USING MICROWAVE? Microwaves are the Radio wave which has the wave length range of 1mm to 1meter and frequency range is 300MHz to 300GHz. Microwaves are good for transmitting information from one place to another. Fig 2 : How microwave energy can penetrate rain, snow, clouds and smoke.
- 6. 9/28/2018 6 MICROWAVE REGION OF EM SPECTRUM Fig 3 : Microwave region
- 7. 9/28/2018 7 FREQUENCY SELECTION Select license free 2.45 GHz Industrial, Scientific and Medical (ISM) radio bands ISM bands are reserved internationally for non-commercial use of RF electromagnetic fields for industrial, scientific and medical purpose Fig 4 : S-Band of Microwave Region
- 8. 9/28/2018 8 General Block Diagram Fig 5 : Block Diagram
- 9. 9/28/2018 9 Transmitter Section 1. Magnetron 2. Slotted waveguide antenna
- 10. 9/28/2018 10 Magnetron A vacuum tube oscillator that generates high power EM signals in the microwave frequency range. Fig 6: Magnetron Fig 7 : Internal construction of Magnetron
- 11. 9/28/2018 11 Continued... It is a microwave tube in which electrons generated from a heated cathode are affected by magnetic and electric fields to produce microwave radiation Magnetron is used to produce high-power output required in radar and communication equipment Fig 9: Path of electrons in Magnetron Fig 8 : Orientation of fields
- 12. 9/28/2018 12 SLOTTED WAVEGUIDE ANTENNA •It is an Omni-directional antenna . •Slotted antenna arrays used with waveguides are popular antenna in navigation, radar and other high-frequency systems Fig 10: Structure and Field orientation of a slotted waveguide antenna
- 13. 9/28/2018 13 Continued... •Here we use frequency of 2.45GHz . •It is used as ideal power transmitter (because of its high aperture efficiency >95%) •It has high power handling capacity. •It has 64 slots of power uniformly through free space to the Rectenna . Fig 11: Slotted Waveguide Antenna
- 14. 9/28/2018 14 RECEIVER SECTION 1. RECTENNA 2. SENSORY CIRCUIT
- 16. 9/28/2018 16 PROCESS OF RECTIFICATION Comprises of a dipoles and Schottky diodes. Usually its elements are arranged in the mesh pattern The efficiency is up to 90% in laboratory environments Fig 12: Mesh pattern arrangement of elements of Rectenna
- 17. 9/28/2018 17 SENSORY CIRCUIT Simple circuit which detects whether the user is making a call On the reception of the microwave signal ,the sensor circuitry directs rectenna circuit to ON Rectenna circuit converts microwave energy to dc output Mobile phone begins to charge using the microwave power as long as the user talks over cell phone. Fig 13: LM2907 IC
- 18. 9/28/2018 18 Advantages of Wireless Charging Charging of mobile phone is done wirelessly We can saving time for charging mobiles Wastage of power is less Better than witricity as the distance the witricity can cover is about 20 meters whereas in this technology we are using base station for transmission that can cover more area Mobile get charged as we make call even during long journey Lower risk of electrical shock because there are no exposed conductors Safe for medical implants for embedded medical devices allows recharging through skin rather than having wires penetrate through skin
- 19. 9/28/2018 19 Disadvantages of Wireless Charging Radiation problems may occur Network traffic may cause problems in charging Charging depends on network coverage
- 21. 9/28/2018 21 Continued... Fig 15: A laser pilot beam guides the microwave power transmission to a rectenna Space-based solar power (SBSP) the concept of collecting Solar Power in Outer Space and distributing it to Earth
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- 24. REFERENCES 1. Theodore.S.Rappaport, ―Wireless Communications Principles and Practice 2. Wireless Power Transmission -A Next Generation Power Transmission System, International Journal of Computer Applications Volume 1 No. 13. 3. Images from Google (www.google.co.in) 4. Information's from Wikipedia (www.wikipedia.org) 5. www.seminarprojects.com 6. www.Howdostuffwork.com 9/28/2018 24