# Ppt final (1)

no em Gautam Buddha University
2 de Jun de 2013
1 de 20

### Ppt final (1)

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• 2.  Witricity is nothing but wireless electricity.  Transmission of electrical energy from one object to another without the use of wires is called as Witricity.  Because of Witricity some of the devices won't require batteries to operate. 2
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• 4. 4 . The story started late one night a few years ago. It was probably the sixth time that month that MIT Professor Marin Soljacic was awakened by his mobile phone beeping battery low. At that time it occurred to him that there is electricity wired all through his house, office- everywhere. He think about- how it is possible to use electricity without using wires… Eureka! Coupled Resonators
• 6. Electricity is a general term that encompasses a variety of phenomena resulting from the presence and flow of electric charge. Magnetism is a force that acts at a distance due to a magnetic field. This field is caused by moving electrically charged particles or is inherent in magnetic objects such as magnet. 6
• 7. Electromagnetic induction is the production of voltage across a conductor moving through a magnetic field. Electromagnetism is one of the four fundamental interactions of nature, along with strong interaction, weak interaction and gravitation. It is the force that causes the interaction between electrically charged particles; the areas in which this happens are called electromagnetic fields Energy/Power Coupling: Energy coupling occurs when an energy source has a means of transferring energy to another object 7
• 8. Resonance :is the tendency of a system to oscillate with larger amplitude at some frequencies than at others. These are known as the system's resonant frequencies (or resonance frequencies). At these frequencies, even small periodic driving forces can produce large amplitude oscillations Resonant Magnetic Coupling: Magnetic coupling occurs when two objects exchange energy through their varying or oscillating magnetic fields. Resonant coupling occurs when the natural frequencies of the two objects are approximately the same. 8
• 9. 9 The Transfer of Electricity from one place to another without wires is known as “Witricity”. There is witricity power sources(transmitter) and capture devices(receiver). Power source provides power to the devices where as capture device captured it to work. Power source and capture devices are specially designed magnetic resonators. Magnetic resonators efficiently transfer power over large distance via the magnetic near-field.
• 10. 10 2007: A physics research group, led by Prof. Marin Soljacic,at MIT, wirelessly power a 60W light bulb with 40% efficiency at a 2 meters (6.6 ft) distance using two 60 cm-diameter coils The first experiment of witricity, the concept of wireless electricity, was conducted in the year 2006, by researchers from Massachusetts Institute of Technology. The Assistant Professor of this team of researchers was Marin Soljacic.
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• 14. Non radiative energy transfer Safe for living beings and other environmental objects Flexible geometry Device that can fit into OEM (original equipment manufactures)products 14 Scalable design From Mw to kW Energy transfer via magnetic near field Can penetrate and wrap around obstacles Highly resonant strong coupling High efficiency over distance Witricity’s Technology Technology Benefit
• 15.  Direct wireless power-within the range of witricity power source Automatic wireless charging- both in and out of range of its witricity power source. 15
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• 17. Wastage of power is small . Negative health implications. Highly efficient than electromagnetic induction Less costly.  No need of line of sight.  No need of power cables and batteries.  Does not interfere with radio waves. 17
• 18.  Wireless power transmission can be possible only in few meters.  Efficiency is only about 40%. 18
• 19.  Teams’ next aim is to get a robotic vacuum or a laptop working, charging devices placed any where in the room and even robots on factory floors.  In another 3 to 5 years time. they will come up with a witricity for commercial use.  It can also be used in cars to connect each electronic equipment with a single tram misted coil 19
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