Witricity

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Information about Witricity
Science-Technology

Published on September 5, 2010

Author: aSGuest64824

Source: authorstream.com

Witricity : Witricity Revolution in the field of electricity R.CHAITANYA EEE,IIIyear What is witricity? : What is witricity? The Transfer of Electricity from one place to another without wires is known as “WiTricity Because of Witricity some of the devices won't require batteries to operate. HISTRY OF WIRELESS POWER : In 1891, Sir Nikola Tesla Proposed a method of Wireless Power Transmission As it is in Radiative mode, most of the Power was wasted and has less efficiency. HISTRY OF WIRELESS POWER Story behind WITRICITY : 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… Story behind WITRICITY WITRICITY BASICS : WITRICITY BASICS Electricity Magnetism Electromagnetic induction Electromagnetism Energy/Power Coupling: Resonance Resonant Magnetic Coupling Slide 7: The flow of electrons (current) through a conductor (like a wire), or charges through the atmosphere (like lightning).  A convenient way for energy to get from one place to another! Magnetism is a force that acts at a distance due to a magnetic field. This field is caused by moving electircally charged particles or is inherent in magnetic objects such as magnet. Electricity Slide 8: Electromagnetic induction A term for the interdependence of time-varying electric and magnetic fields For example, it turns out that an oscillating magnetic field produces an electric field and an oscillating electric field produces a magnetic field. Slide 9: 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 Electromagnetism Energy/Power Coupling: coupling occurs when an energy source has a means of transferring energy to another object. Slide 10: :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 RESONANCE 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. EXAMPLE OF RESONANCE : SOLDIERS MARCHING ON A BRIDGE. If the frequency of their stepping reaches to the natural frequency of the bridge, it may collapse due to ‘RESONANCE’. EXAMPLE OF RESONANCE WITRICITy technology : WITRICITy technology 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. The Transfer of Electricity from one place to another without wires is known as “Witricity”. Power source and capture devices are specially designed magnetic resonators. Magnetic resonators efficiently transfer power over large distance via the magnetic near-field Near field : Near field Near field is a wireless transmission technique over distances comparable to or a few times the diameter of devices. Near field is usually magnetic. Near field energy is non radiative .but some radiative and resistive losses will occur. The blue lines represent the magnetic near field induced by the power source. The yellow lines represent the flow of energy from the source to the WiTicity capture coil Slide 14: Coupled resonators Two resonant objects of the same resonant frequency tend to exchange energy. Coupled resonators are said to be operate in strongly coupled regime to avoid material absorption and radiative loss. Slide 15: 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 MIT teams behind witricity technology Massachusetts Institute of Technology Slide 17: Experimental Design: Our experimental scheme consists of two Self-resonant coils. One coil (source coil) is coupled inductively to an oscillating circuit; the other (device coil) is coupled inductively to a resistive load. Self-resonant coils rely on the interplay between distributed inductance and distributed capacitance to achieve resonance. Slide 18: Range & Rate of Coupling: Using Coupled Mode Theory (CMT), we can give some frame work to the system. The field system of the two resonant objects 1, 2 is F(r,t)=a1(t)F1(r)+a2(t)F2(r) Where F1,2(r) are the resonating modes of 1 and 2 alone, and then the field amplitudes a1(t) and a2(t).The lower order representation of the system is given by : Where ω1, 2 are the individual frequencies, Γ1, 2 are the Resonance widths (Decay rates) due to the objects’ intrinsic (absorption, radiation etc.) losses, and ‘κ’ is the coupling coefficient . Slide 19: The solution of the equation show that at exact resonance at ω1=ω2 and Γ1=Γ2 the normal modes of the combined system are split by 2κ. The energy exchange between the two objects takes place in time Pi/κ and is nearly perfect, apart for losses, which are minimal when the coupling rate is much faster than all loss rates (κ>> Γ1, 2). It is exactly this ratio {κ /sqrt (Γ1, 2)} shows that, it will set as figure-of-merit for any system under consideration for wireless energy-transfer, along with the distance over which this ratio can be achieved. The desired optimal regime {κ/sqrt (Γ1,2)>>1} is called “Strong-Coupling” regime. There is No change in Energy, unless κ/Γ>>1 is true. Slide 21: Imagine a future in which wireless electricity makes everyday products more convenient, reliable, and environmentally friendly. Slide 24: Q: Is WiTricity technology safe? A: WiTricity’s technology is a non-radiative mode of energy transfer, relying instead on the magnetic near field. Magnetic fields interact very weakly with biological organisms—people and animals—and are scientifically regarded to be safe. WiTricity products are being designed to comply with applicable safety standards and regulations. Slide 25: Automatic wireless charging of mobile electronics in home, car, office,...while devices are in use and mobile. Direct wireless powering of stationary devices…eliminating expensive custom wiring, unsightly cables and “wall-wart” power supplies. CONSUMER ELECTRONICS APPLICATIONS Slide 26: Automatic wireless charging for existing electric vehicle classes: golf carts, industrial vehicles. Automatic wireless charging for future hybrid and all-electric passenger and commercial vehicles, at home, in parking garages, at fleet depots, and at remote kiosks. Direct wireless power interconnections to replace costly vehicle wiring harnesses and slip rings. Automatic wireless charging for existing electric vehicle classes: golf carts, industrial vehicles. Automatic wireless charging for future hybrid and all-electric passenger and commercial vehicles, at home, in parking garages, at fleet depots, and at remote kiosks. Direct wireless power interconnections to replace costly vehicle wiring harnesses and slip rings. Transportation Slide 27: Direct wireless power interconnections and automatic wireless charging for implantable medical devices (ventricular assist devices, pacemaker, defibrilator, etc.). Automatic wireless charging and for high tech military systems (battery powered mobile devices, covert sensors, unmanned mobile robots and aircraft, etc.). Direct wireless powering and automatic wireless charging of smart cards. Direct wireless powering and automatic wireless charging of consumer appliances, mobile robots, etc. Other Applications Slide 28: No need of line of sight. No need of power cables and batteries. Does not interfere with radio waves. Wastage of power is small . Negative health implications. Highly efficient than electromagnetic induction Less costly. ADVANTAGES Slide 29: Wireless power transmission can be possible only in few meters. Efficiency is only about 40%. Disadvantages Slide 30: 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. THANK YOU : THANK YOU

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