Wireless power transmition

             Witricity1.                    INTRODUCTION TO WITRICITY.   ØWhat is Wi-tricity?

Wi-tircity Stands for Wireless Power Transmission. It transfer  the electricity without connection of               wire from input to output. It is Wireless transmission of signal. In witricity transmitter and receiver are used for transmission of signal and these rays are not harmful to humans.
 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.
In the 1890’s wireless energy transmission was demonstrated by Nikola Tesla using his demonstration on resonant transformers called Tesla coils. Since these coils had undesirable electricfields which radiated energy in all directions, the efforts made by Tesla made little success. Various technologies for wireless power transfer like capacitive coupling, microwave and laser method have been proposed involving far fields. However it is the technology using magnetic resonance couplinghas been found to be a viable technology for midrange energy transfer. Further, this means of energy transfer uses non-radiative mode of transmission and offers the use of connector free devices and is an alternative to the use of hazardous disposable batteries. Wireless energy transfer or WiTricity is currently extending its applications to medical implants saving patients from undergoing operations to replace the lithium ion batteries used for pacemakers. Magnetic resonance is also being used for charging of electric vehicles while driving on a highway. Since this technology can work even in water, powering of under- water cameras can be done reliably.


1.       BLOCK DIAGRAM



1.                WORKING

This project is built upon using an electronic circuit which converts AC 230V 50Hz to AC 12V, High frequency. The output is fed to a tuned coil forming as primary of an air core transformer. The secondary coil develops a voltage of HF 12volt. Thus the  transfer of power is done by the primary(transmitter) to the secondary that is separated with a considerable distance(say 3cm). Therefore the transfer could be seen as the primary transmits and the secondary receives the power to run load.  Moreover this technique can be used in number of applications, like to charge a mobile phone, iPod, laptop battery, propeller clock wirelessly. And also this kind of charging provides a far lower risk of electrical shock as it would be galvanically isolated. This concept is an Emerging Technology, and in future the distance of power transfer can be enhanced as the research across the world is still going.In witricity ,our load or appliances are safe from short circuit ,because in input side if short circuit is happened so the transmission in stop. So at receiver the signal are not induced in coil, hence the output of receiver is not present then our load is safe.In witricity, the number of turns of coil is increases then maximum voltage are transmit and receive on large distance.In this circuit, bridge rectifier are used, because in full wave and half wave rectifier efficiency is less than bridge rectifier. And 100% efficiency in bridge rectifier so, bridge rectifier are used.
HARDWARE COMPONENTS:          1.Capacitor 10µf         2.Ceramic  Capacitor 22pf          3.Diode         4.Push Button         5.LED         6.Tip3055         7.Resistance 220Ω         8.Resistance 1k         9. IC 555
         10. Voltage regulator
         11. Heat sink         12. coil
        Circuit diagram
for better understanding