Wireless Power Transmission


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Based on microwaves.
it may be useful for project.

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Wireless Power Transmission

  2. 2. SLIDE PLAN  WPT -definition Reason for WPT History Components of WPT Efficiency Applications Advantages and Disadvantages Conclusion
  3. 3. WHAT IS WPT? Wireless power transmission is a concept of transmitting power without using wires. The power transmission is based on microwaves from one place to another in order to reduce transmission and distribution losses.
  4. 4. REASONS FOR WPT Wireless transmission is useful in cases where interconnecting wires are inconvenient, hazardous, or impossible. The losses occur during the transmission and distribution of electrical power. The percentage of loss is 26%.
  5. 5. HISTORY • Experiments performed between 1888 and 1907 by Nikola Tesla • Started efforts on wireless transmission at 1891 in his “experimental station” at Colorado • He lighted a small incandescent lamp by means of a resonant circuit grounded on one end • William C. Brown, the pioneer in wireless power transmission technology • The idea of Tesla is taken in to research after 100 years by a team led by Marin Soljacic from MIT.
  6. 6. COMPONENTS OF WPT Microwave Generator • The microwave transmitting devices are classified as Microwave Vacuum Tubes, Microwave Power Module (MPM) and Semiconductor Microwave transmitters. • Magnetron is widely used for experimentation of WPT. • The highest efficiency over 90% is achieved at 2.45 GHz among all the frequencies.
  7. 7. Transmitting Antenna • The slotted wave guide antenna, microstrip patch antenna, and parabolic dish antenna are the most popular type of transmitting antenna. • The slotted waveguide antenna is ideal for power transmission because of its high aperture efficiency (> 95%) and high power handling capability.
  8. 8. Rectenna • It was first conceived by W.C. Brown in the early of 1960s. • The rectenna is a passive element consists of antenna, rectifying circuit with a low pass filter
  9. 9. Functional block diagram of WPT system TRANSMITTING ANTENNA MICROWAVE ON FREE SPACE SCHOTTKY BARRIER DIODE RECEIVING ANTENNA Microwave Power Source Coax- Waveguide Adaptor Waveguide Circulator Tuner & Directional Coupler Coax- Waveguide Adaptor Impedance Matching & Filter Circuit
  10. 10. EFFICIENCY The efficiency of wireless power is the ratio between power that reaches the receiver and the power supplied to the transmitter. A rectenna may be used to convert the microwave energy back into electricity. Rectenna conversion efficiencies exceeding 95% have been realized.
  11. 11. MERITS Eliminates the high-tension power transmission line cables, towers and sub stations cost of transmission and distribution become less. High efficiency. No power failure and power theft. Safer by eliminating the sparking hazard.
  12. 12. DEMERITS The capital cost for practical implementation of WPT seems to be very high. Interference of microwave with present communication systems.
  13. 13. Biological Impacts Common beliefs fear the effect of microwave radiation.  But the radiation level is less than radiation from microwave oven and higher than cellular phone. Thus public exposure to WPT fields would also be below existing safety guidelines.
  14. 14. Environmental issues Interferences to Existent Wireless System Safety on Ground Interaction with Atmosphere Interaction with Space Plasmas
  15. 15. APPLICATIONS OF WPT I. Wireless Power Transmission for Electric Vehicles
  16. 16. II. Wireless Power Transmission for Mobile Phones
  17. 17. CONCLUSION WPT emerges out as the best alternative for efficient power transmission despite its few drawbacks such as very high installation cost. WPT has very high efficiency as the loss during power transmission is nearly negligible and it acts as boon for the people of those areas where wired transmission is not possible. The power failure due to short circuit and electric faults would not possible at all.
  18. 18. REFERENCE [1] http://cleantechindia.wordpress.com/2008/07/16/indiaselectricity- transmission-and-distribution-losses/ [2] Nikola Tesla, My Inventions, Ben Johnston, Ed., Austin, Hart Brothers, p. 91,1982. [3] Nikola Tesla, “The Transmission of Electrical Energy Without Wires as a Means for Furthering Peace,” Electrical World and Engineer. Jan. 7, p. 21, 1905. [4] The Electrician (London), 1904). [5] W.C. Brown, J.R. Mims and N.I. Heenan, “An Experimental Microwave-Powered Helicopter”, 965 IEEE International Convention Record, Vol. 13, Part 5, pp.225-235. [6] Brown., W. C. (September 1984). "The History of Power Transmission by Radio Waves". Microwave Theory and Techniques, IEEE Transactions on (Volume: 32, Issue: 9 On page(s): 1230- 1242 + ISSN: 0018-9480). http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1132833.