Wireless Power Transmisson


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Wireless energy transfer or wireless power is the transmission of electrical energy from a power source to
an electrical load without a conductive physical connection. In this paper the technologies available for
Wireless Power Transmission (WPT) and its future possible advancements is being discussed to assume its
feasibility in actual practices.
In our present electricity system much of the power generated is wasted during transmission from power
plants to the consumers passing through cables, substations, etc. With WPT the need for inefficient and
costly, cables, towers, and substations will be eliminated & so will the power losses, finally reducing the
cost of energy. This is one such technology that can make the transmission system highly efficient &
economical. One mere demerit of WPT is that it develops reactive power at a small frequency that is very
biologically compatible and harmful to environment & living beings on over exposure.

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Wireless Power Transmisson

  1. 1. By: Abhinav Goel Tarun Sharma Avinash
  2. 2. Wireless Transmission of Electricity (Witricity)concept originated during turn between 19thand 20th century. Then scientists whocontributed to this technology are –  Nickola Tesla  William C Brown  Bill Brown  Hidetsugu Yagi
  3. 3.  First scientist to come up with the idea of Wireless Power Transmission(WPT). Able to light lamps over 25 miles away without using wires (Wardenclyffe tower experiment). Used oscillators to energize primary coil attached to the power source.
  4. 4.  Induction ◦ Electrodynamics ◦ Electrostatic Electromagnetic Radiation ◦ Laser ◦ Microwaves Evanescent Wave Coupling
  5. 5.  Principle: Mutual Induction between isolated coils or conductors. -Electrodynamics (Electromagnetic coupling) -Electrostatic (Capacitive Coupling) Transformer is a basic example. The main drawback to induction is the short range. Magnetic field spreads in all directions wasting a large amount of energy.
  6. 6.  Electricity transmitted by converting it into electromagnetic waves. Antennas of electronic devices will receive waves converting them back to electrical energy. Mainly, two types of e.m. waves are used- -Lasers -Microwaves A big disadvantage is that e.m. waves can harm the environment & even living beings
  7. 7. Microwave & Laser Transmission• Microwave • Laser – Electrical energy converted – Electrical energy to Microwaves and beamed to a large antenna converted to beam fired (Rectenna) that converts it at a receiving target, to D.C. electricity. (Power Beaming) & is – More developed converted back to power. – High efficiency up to 85% – Range of 10% to 20% – Beams is far below the efficiency within a few lethal levels of years concentration even for a prolonged exposure – Conform to limits on eye and skin damage. – Cause interference with satellite communication – Victim of atmospheric system. absorption.
  8. 8.  In 2006 MIT researchers discovered an efficient method to transfer power. Transfer power using non-radiative. Electromagnetic energy Resonant Tunnelling. Does not disturbs communication system. Wastage of energy is small. No need of line of sight between transmitter and receiver as in lasers. Most efficient way to transmit Power wirelessly introduced up till now. Negative health effects.
  9. 9. Electromagnetic energy Resonant Tunnelling Curved coil of wire makes an inductor. . A capacitance plate which can hold a charge attaches to each end of the coil. As electricity travels through this coil the coil begins to resonate. Electricity traveling along an e.m. wave can tunnel from one coil to the other as long as the both have the same resonant frequency.
  10. 10.  For small portable electronic devices electrical energy can be converted to radio signals and can be transferred to the device which receives radio frequency radiation and converts it to DC electricity that could be stored in a battery for use. Electrical energy can propagate around the world. Power demands differ at different time, high demands during day and low during night . So, the extra power available during the night could be transmitted to the side of the planet where it is day time.
  11. 11. Merits: Demerits  Eliminates use of existing high-tension power • The Capital Cost for practical implementation transmission line cables, of WPT seems to be very towers and sub stations. high.  Facilitates transmission • Microwaves interferes with of energy on a global the present communication systems. scale. • Develops reactive power  Low Energy costs. at a small frequency that  The power failure due to is very biologically short circuit would never compatible and harmful to environment & living exist. beings on over exposure.  Power theft would be not possible at all.
  12. 12.  Wireless transmission is now a reality & is in development. Will make Transmission system more economical, cheap & reduce pollution. Merits of this technology overshadow its demerits.
  13. 13. Thank You