Electricity through wireless transmission witricity


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Electricity through wireless transmission witricity

  2. 2. Introduction In our present electricity generation system we waste more than half of its resources. Especially transmission and distribution losses are main concern of the present power technology. The transmission and distribution system causes a loss of 26% to 30% of energy generated. The transmission of power without wires is
  3. 3. History of Wireless Power In 1899, Sir Nikola Tesla Proposed a method of Wireless Power Transmission. Nikola Tesla – The Genius He enlighted 200 lamps at the distance of 40 km, Wirelessly ! The efficient midrange powertransfer concept is Witricity. In thismodel source and load are inMagnetic resonance so there is nopower loss.
  4. 4. Research at MIT * Prof. Soljacic – Another Genius MIT-IBM Collaboration * He did succeed to redesign Tesla’s experiment in safer way. * They had lit up a 60W bulb with a power source at a distance of 7 feet(over 2m) with no wires
  5. 5. The forgotten invention is reborn in 2007RESONANCE COUPLING A group of engineers at MIT came up with the idea to use resonant induction to transmit power wirelessly. “Resonance", a phenomenon that causes an object to vibrate when energy of a certain frequency is applied.
  6. 6. Experiment demonstrated at MIT.A 60W light bulb lit from source at a distance of 2m fromload.
  7. 7. Electric bulb lightened even when a barrier waskept in between.
  8. 8. Need of Witricity:* Cell phones, i pods, laptop computers are capable of re-charging themselves without ever being plugged in.
  9. 9. What is WiTricity ?definition is :* “Transmission of energy through the air”.* A system of two electromagneticresonators coupled mostly throughtheir magnetic fields.** Cables are going to replaced by WiTricity. Efficient power transfer
  10. 10. Types and Technologies Near-field techniques  Inductive Coupling  Resonant Inductive Coupling  Air Ionization Far-field techniques  MicrowavePower Transmission (MPT)  LASER power transmission
  11. 11. Inductive coupling Primary and secondary coils are not connected with wires. Energy transfer is due to Mutual Induction
  12. 12. Cont… Energy transfer devices are usually air-cored Transformer is an example Wireless Charging Pad(WCP),electric brushes are some examples The charging pad (primary coil) and the device(secondary coil) have to be kept very near to each other
  13. 13. Resonance InductiveCoupling(RIC)* Same concept as Inductive coupling just that the coils operate at resonant frequency leading to efficient transfer of energy over a larger distance.* Interacts weakly with extraneous off resonant objects.* Radiation loss will be negligible
  14. 14. Resonant Inductive Coupling
  15. 15. Air Ionization Toughest technique under near-field energy transfer techniques Air ionizes only when there is a high field Needed field is 2.11MV/m Natural example: Lightening Not feasible for practical implementation.
  16. 16. Far-field energy transfer Microwave Power Transfer(MPT) Transfers high power from one place to another. Steps:  Electrical energy to microwave energy  Capturing microwaves using rectenna  Microwave energy to electrical energy AC can not be directly converted to microwave energy AC is converted to DC first DC is converted to microwaves using magnetron Transmitted waves are received at rectenna which rectifies, gives DC as the output DC is converted back to AC
  17. 17. LASER transmission LASER is highly directional, coherent Not dispersed for very long But, gets attenuated when it propagates through atmosphere Simple receiver  Photovoltaic cell Cost-efficient
  18. 18. Applications  Direct Wireless Power  No device needs wires  For TVs, toasters or any form of Immobile devices  Automatic Wireless Charging  Device with rechargeable batteries charges itself  For any form of mobile device
  19. 19. Some more Applications… * Consumer electronics. *Industrial  would be free of heavy installation of wires and devoid of any hazardous electric shock incidents. *Transportation  Could charge an electric car or automobile.
  20. 20. Wireless power transmission issafe Human beings or other objects placed between the transmitter and receiver do not hinder the transmission of power. magnetic fields tend to interact very weakly with the biological tissues of the body, and so are not prone to cause any damage to any living beings.
  21. 21. Advantages Efficient and reliable power. Creation of a shock free environment devoid of any chances of power thefts. Provides solution to the ever increasing demand for power. A solution to reduce e-waste- a more safe environment. A more cost effective methodology for getting electricity to your houses which includes paying less for use of power. Not affected by the day and night cycle, leads to lesser limitations on power harvesting.
  22. 22. Disadvantages. For short and mid range transfer system has to be set at the right frequency or there would be no power transfer. For long range the installation cost is high.
  23. 23. CONCLUSION Transmission without wires- a reality Efficient Low maintenance cost. But, high initial cost Better than conventional wired transfer Energy crisis can be decreased Low loss In near future, world will be completely wireless