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# WiTricity

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### WiTricity

1. 1. 1
2. 2. Introduction & Invention  The term WiTricity is derived from the combination of two words wireless + electricity. In 1891, Sir Nicola Tesla proposed a method of wireless power transmission. But it was in most radiative mode, so most of the power is wasted during transmission.  But later this concept was attracted by MIT professor Mr. Marin Soljacic. 2
3. 3. Cont… The story started late one night the few years ago. It was probably sixth time of that month. Mr. Marin was awakened by his mobile phone beeping low battery warning signal. At that time he thought about the transmission of electricity without wires. This is a most important cause for WiTricity. 3
4. 4. Principle:  The basic principle involved in WiTricity concept is, Two objects having same resonating frequency and in Magnetic resonance at Strongly coupled regime tend to exchange energy , while dissipating relatively little energy to the extraneous off- resonant objects.  Resonance coupling 5
5. 5. Early achievements: In 1899,Tesla achieved a major breakthrough in his work at Colorado by transmitting 100 million volts of electric power wirelessly over a distance of 26 miles to light up a bank of 200 light bulbs and run one electric motor. Sir Nicola Tesla 6
6. 6. Limitations:  A Tesla Coil produces high voltage electric arcs. These arcs cause permanent damage to electrical devices on contact  It is not capable of working in Direct Current, It works only in Alternating Current. 7
7. 7. 9
8. 8. Types of WiTricity In general, witricity is classified into three types, they are:  Short range; Inductive Coupling.  Medium range; Resonant Induction.  Long range; Electromagnetic Wave Power Transfer. Short Range Medium Range Long Range 10
9. 9. Inductive Coupling:  Inductive coupling works on the principles of electromagnetism.  When a current (electricity) passes through a wire, it generates a magnetic field perpendicular to the wire.  When a wire is in proximity to a magnetic field, it generates a current in that wire.  Magnetic fields decay quickly , making inductive coupling effective only at very short ranges. 11
10. 10. Resonant induction: Resonant induction still uses the same principles as magnetic induction (magnetic fields to transfer current) , but it uses resonance to increase the range at which the transfer can efficiently take place. “Resonance", a phenomenon that causes an object to vibrate when energy of a certain frequency is applied. 12
11. 11. Cont…  Everything resonates at a certain frequency, based on its shape and material.  Energy transfers easily between resonating objects. An example of this is when an opera singer shatters wine glasses by singing at the frequency at which the glasses resonate.  With resonant induction, power is transmitted between two resonating coils. 13
12. 12. Cont… 14
13. 13. Cont….  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. Experimental Design Electrical Resonance15
14. 14. Long range: In long range the electricity is converted into microwaves and transmitted for a long distances  It is a on going research in the field of WiTricity 16
15. 15. Is wiTricity safe?  Many are concerned about another radio fields or frequency flying through the air. Some believe that these are harmful to the body but there is little evidence to suggest they are.  WiTricity, however, turns electricity into a magnetic field, which is a non-radiative transfer method. Magnetism interacts very minimally with biological organisms and is not harmful at all to humans or animals.  WiTricity has been scientifically proven not to be harmful and has been designed to comply with applicable safety standards and regulations. 17
16. 16. How efficient is WiTricity?  WiTricity have only about 40-45% of efficiency.  The efficiency of WiTricity is based on distance between the source coil and the load coil.  And it is mainly based on the resonating frequency of the coils. 18
17. 17. Applications of WiTricity: Haier wireless TV  Using the wireless and efficient transmission technology to good effect, Haier has developed a completely wireless HDTV. Employing WiTricity and Wireless Home Digital Interface (WHDI), the HDTV is made to stream videos over 100 feet. That’s some distance, when you’re talking of no wires at all. Haier’s WiTricity TV 19
18. 18. Cont… Automatic car charging technology  Toyota and WiTricity to develop new wireless charging tech that requires no contact and WiTricity’s current technology is comparable to standard Level to fast charge technology, providing up to 3.3 kilowatts of power. WiTricity Charging tech 21
19. 19. Advantage of WiTricity:  WiTricity is consider as Safe, fairly efficient, good range.  Magnetic fields interact weakly with biological masses (humans), Theoretically one stationary coil in a room could power multiple devices with receiving coils. No more messy wires, and with widespread enough use it could even eliminate costly batteries. 22
20. 20. Conclusion:  The transmission of power without wires is not theory or a mere possibility, it is now a reality. The electrical energy can be economically transmitted without wires to any terrestrial distance.  The system would reduce the cost of electrical energy used by the consumer and get rid of the landscape of wires, cables, and transmission towers. It has negligible demerits like reactive power which was found insignificant and biologically compatible. 23
21. 21. Just imagine our future 24
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23. 23. 26 By, Abuthahir.T Arumugam.A