Witricity Wireless Electricity

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A.Meera P.Janani K.Ramakrishnan College of Engineering K.Ramakrishnan College of Engineering meera.tulasi@gmail.com janani.ukp@gmail.com


Our forefathers marveled at the invention of glowing light bulbs by Thomas Edison in 1879.however to us 21st centurions the light bulb is nothing out of ordinary .When computers, cell phones, laptops, iPods etc were invented, our antennas tweaked. Each appliance has its own set of chargers and with every family member owning their cell phones, the drawers are overflowing with all sort of wires. When you are on the way to work and your cell phone beeps in hunger for a battery charge, haven’t you wished for your cell phone battery to get self charged? Well your plight has been heard by doctor witricity. The technology used for wireless power transmission is known as witricity. Witricity is based upon coupled resonant objects. Two resonant objects of the same resonant frequency tend to exchange energy efficiently, while not interchanging the surroundings. The researchers demonstrate the ability to transfer 60W with approximately 40% efficiency over distance in excess of 2 meters. Currently the project is looking for power transmission in the range of 100watts. As witricity is in the development stage, lots of work is to be done in improving the range of power transmission and efficiency.

1. Introduction

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. 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 vitricity 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 witrecity 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. .[pic]

2. Need of Witricity

Now a days there is a Rapid development of autonomous electronics like Laptops, Cell-phones, House-hold robots and all those devices typically rely on chemical energy storage (Battery). As they are becoming daily needs to present generation, Wireless energy transfer would be useful for many applications as above and they need midrange energy.

3. Method used for Wireless Energy Transmission

3.1. Induction (Inductive coupling)

This is the first method used for wireless power transfer. The simplest example for wireless energy transfer using this method is the electrical transformer. In this the primary and secondary circuits are electrically isolated from each other. The transfer of energy takes place by electromagnetic coupling through mutual...
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