Topics: Wireless energy transfer, Electromagnetism, Radio Pages: 9 (2669 words) Published: February 23, 2012
Submitted to JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY, Anantapur In partial fulfillment of award of the degree of
Bachelor of Technology


(Affiliated to J.N.T.U, ANANTAPUR)

Human brains always search for the new ways and means which makes life easy and simple. Over the past years great scientists invented great things which changed the world completely and effectively. Even then the thrust for the new inventions was not fulfilled. So many new things are dumped in to the market time-to-time. Among those electronic gadgets have major share. Now a days our life depends much on electronic devices. All these devices have different cables and pins for their operation. We have to insert those cables in the sockets for the supply and also some times to recharge some of the devices. Let us take an example as cell phone. We have to charge it time to time other wise it will be switched off. So we use a cable to charge it. If we forget that we will loss some thing. Similarly all the electronic gadgets depend on cables for their operation. Imagine if all the gadgets take care of themselves and become independent of cables. It will be a great and very useful thing to implement. A professor from MIT named MARIN SOLJACIC had this wonderful thought and with the help of some other members found one interesting concept called WITRICITY. Witricity is a portmanteau for wireless electricity. This concept laid the way to get rid of the wires and cables.

Electricity is today a necessity of modern life. It is difficult to imagine passing a day without electricity. The conventional use of electricity is made possible through the use of wires. However researchers in MIT have devised a means of providing electricity without any wires. These researchers coined the term WITRICITY, which is basically a portmanteau for wireless electricity. This principle of wireless electricity works on the principle of using coupled resonant objects for the transference of electricity to objects without the use of any wires. A Witricity system consists of a Witricity transmitter and another device called the receiver. The receiver works on the same principle as radio receivers where the device has to be in the range of the transmitter. It is with the help of resonant magnetic fields that Witricity produces electricity, while reducing the wastage of power. This is unlike the principle adopted by Nikola Tesla in the later part of the 19th century; where conduction based systems were used. The present project on Witricity aims at power transmissions in the range of 100 watts. May be the products using WITRICITY in future might be called Witric or Witric's. So far the MIT researchers have been able to power a 60 watt light bulb from a power source that is located about seven feet away, while providing forty percent efficiency. This was made possible using two copper coils that were twenty inches in diameter which were designed so that they resonated together in the MHz range. One of these coils were connected to a power source while the other, to a bulb. With this witricity setup, the bulb got powered even when the coils were not in sight.

Resonant induction:
In November 2006, Marin Soljacic and other researchers at the Massachusetts Institute of Technology applied the near field behavior well known in electromagnetic theory to a wireless power transmission concept based on strongly-coupled resonators. In a theoretical analysis (see Ref: Annals of Physics), they demonstrate that, by designing electromagnetic resonators that suffer minimal loss due to radiation and absorption and have a near field with...

References: • B.L. THERAJA & A.K. THERAJA, ‘A TEXT BOOK OF ELECTRICAL TECHNOLOGY’, 1ST Edition, S. CHAND Publications, 1997.
✓ htpp://web.mit.edu/newsoffice/2007/wireless-0607.html
✓ htpp://en.wikipedia.org/wiki/WiTricity
✓ htpp://www.cwanswers.com/8921/witricity
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