04-10-2014, 01:04 PM
WITRICITY REVIEW THROUGH MAGNETIC RESONANCE COUPLING
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ABSTRACT
A moment without electricity makes your thinking go dry. The major source of conventional form of electricity is
through wires. The continuous research and development has brought forward a major breakthrough, which provides
electricity without the medium of wires. This wonder baby is called WiTricity.If we are particularly organized and good
with tie wrap then also a few dusty power cord tangles around our home. We have even had to follow one particular cord
through the seemingly impossible snarl to the outlet hoping that the plug pull will be the right one. This is one of the
downfalls of electricity. While it can make people's lives easier, it can add a lot of clutter in the process. For these reasons,
scientists have tried to develop methods of wireless power transmission that could cut the clutter or lead to clean sources of
electricity. Wireless power transmission is not a new idea. Many researchers developed several methods for wireless power
transmission. But WiTricity is a new technology used for wireless power transmission. By the use of this technology
transmission of electrical energy to remote objects without wires can be possible. The inventors of WiTricity are the
researchers from Massachusetts Institute of Technology (MIT). They developed a new technology for wireless electricity
transmission and this is based upon the coupled resonant objects. In this resonant magnetic fields are used. So the wastage
of power is reduced. The system consists of WiTricity transmitters and receivers. The transmitters and receivers contain
magnetic loop antennas made of copper coils and they are tuned to the same frequency
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 WiTricity, a portmanteau for wireless electricity, is a term coined initially
by Dave Gerding in 2005 and used by an MIT research team led by Prof. Marin in 2007.
Wireless power transmission is not a new idea; Nikola Tesla demonstrated a "transmission of electrical energy
without wires" that depends upon electrical conductivity as early as 1891 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 Recently, MIT proposed a new scheme based on strongly coupled magnetic resonances, thus presenting
a potential breakthrough for a mid-range wireless energy transfer. The fundamental principle is that resonant objects
exchange energy efficiently, while non-resonant objects do not. Figure 1 shows the basic coil system composed of four
coils: drive, transmit resonance, receive resonance, and load coils. The transmit resonance coil is coupled to the drive coil
which is linked to a power amplifier that supplies energy to the system. The receive resonance coil is coupled with the load
coil to provide the power to an external load. The scheme is carried with a power transfer of 60 W and has RF-to-RF
Electricity
The physical phenomena arising from the behavior of electrons and protons that is aused by the attraction of
particles with opposite charges and the repulsion of particles with the same charge.
NEED OF WITRICITY
WiTricity is nothing but wireless electricity. Transmission of electrical energy from one object to another without
the use of wires is called as WiTricity. WiTricity will ensure that the cell phones, laptops, iPods and other power hungry
devices get charged on their own, eliminating the need of plugging them in. Even better, because of WiTricity some of the
devices won't require batteries to operate.
Imagine a future in which wireless power transfer is feasible: cell phones, household robots, mp3 players, laptop
computers, and other portable electronics capable of charging themselves without ever being plugged in, freeing us from
that final, ubiquitous power wire. Some of these devices might not even need their bulky batteries to operate.
CONCLUSIONS
While scientists have built working prototypes of aircraft that run on wireless power, larger-scale applications,
like power stations on the moon, are still theoretical. As the Earth's population continues to grow, however, the
demand for electricity could outpace the ability to produce it and move it around. Eventually, wireless power may become
a necessity rather than just an interesting idea.
This paper disclosed that WiTricity power application not much operate at full efficiency. The potential
applications of WiTricity are expected to materialize in the new future, of say a few years’ time, after the necessary
modifications are to them. These WiTricity applications are expected to work on the gadgets that are in close proximity to
a source of wireless power where in the gadget charges automatically without necessarily having to get plugged in. There
are no limitations in WiTricity power application where anything and everything that used to run with batteries or electrical
connections can be used using WiTricity. Just imagine, the future WiTricity power application permit you to use wireless
energy, without having to replace or recharge batteries either or of remembering to recharge batteries periodically. In
addition to this, with WiTricity, there is no need of plugging in any wires and plugs and thus face a mess of wires.