states key people alex gruzen ceo website www.witricity.com witricity is an american engineering company that manufactures devices for wireless energy transfer using resonant energy transfer based on oscillating magnetic fields . contents 1 history 2 technology 3 radiation levels 4 see also 5 references 6 reference articles 7 external links history edit the term witricity was used for a project that took place at mit led by marin solja i in 2006 . 1 2 the mit researchers successfully demonstrated the ability to power a 60 watt light bulb wirelessly using two 5 turn copper coils of 60 cm 24 in diameter that were 2 m 7 ft away at roughly 45 % efficiency . 3 the coils were designed to resonate together at 9.9 mhz wavelength 30 m and were oriented along the same axis . one was connected inductively to a power source and the other one to a bulb . the setup powered the bulb on even when the direct line of sight was blocked using a wooden panel . researchers were able to power a 60 watt light bulb at roughly 90 % efficiency at a distance of 3 feet citation needed . the research project was spun off into a private company also called witricity . the emerging technology was demonstrated in july 2009 by ceo eric giler at the ted global conference held in oxford . 4 5 there he refers to the original idea first applied by the physicist nikola tesla between his coils 6 and shows a witricity power unit powering a television as well as three different cell phones the initial problem that inspired soljacic to get involved with the project . automobile manufacturer toyota made an investment in witricity in april 2011 . 7 8 in september 2012 the company announced it would make a 1000 demonstration kit available to interested parties to promote development of commercial applications . 9 needs update technology edit witricity is based on strong coupling between electromagnetic resonant objects to transfer energy wirelessly between them . this differs from other methods like simple induction microwaves or air ionization . the system consists of transmitters and receivers that contain magnetic loop antennas critically tuned to the same frequency . citation needed because witricity devices operate in the electromagnetic near field receiving devices must be no more than about a quarter wavelength from the transmitter . in the system demonstrated in the 2007 paper this was only a few meters at the frequency chosen . in their first paper the group also simulated ghz dielectric resonators . witricity devices are coupled almost entirely with magnetic fields the electric fields are largely confined within capacitors inside the devices which they argue makes them safer than resonant energy transfer using electric fields most famously in tesla coils whose high electric fields can generate lightning since most materials couple weakly to magnetic fields . 10 unlike the far field wireless power transmission systems based on traveling electro magnetic waves witricity employs near field resonant inductive coupling through magnetic fields similar to those found in transformers except that the primary coil and secondary winding are physically separated and tuned to resonate to increase their magnetic coupling . these tuned magnetic fields generated by the primary coil can be arranged to interact vigorously with matched secondary windings in distant equipment but far more weakly with any surrounding objects or materials such as radio signals or biological tissue . citation needed in particular witricity is based on using strongly coupled resonances to achieve a high power transmission efficiency . aristeidis karalis referring to the team s experimental demonstration says that the usual non resonant magnetic induction would be almost 1 million times less efficient in this particular system . 2 the researchers suggest that exposure levels are below the threshold for fcc safety regulations and the radiated power levels comply with fcc radio interference regulations . researchers attribute the delay in developing wireless power technology to limitations of well known physical laws and a simple lack of need . only recently have modern consumers obtained a high number of portable electronic devices that use batteries and plug in chargers . 2 radiation levels edit see also electromagnetic radiation and health the company s faq 1 claims it uses 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 . no actual studies or reports are claimed of the specific technology power levels and use in home environments although it does claim that witricity products are being designed to comply with applicable safety standards and regulations . see also edit electrosmog 11 evanescent wave coupling list of emerging technologies nikola tesla qi inductive power standard another standard for wireless energy transfers magmimo ; 12 another competing wireless power standard resonant energy transfer wrel technology references edit wireless electricity could power consumer industrial electronics . mit news . 2006 11 14 . a b c goodbye wires . mit news . 2007 06 07 . wireless power demonstrated . retrieved 2008 12 09 . fildes jonathan 2009 07 23 . wireless power system shown off . bbc news online . retrieved 2009 09 13 . eric giler demos wireless electricity . ted . july 2009 . retrieved 2009 09 13 . http www.ted.com talks eric giler demos wireless electricity t 15992 gordon bloomfield nikki apr 28 2011 . toyota joins wireless electric car charging revolution . green car reports . retrieved 24 april 2012 . tmc and witricity form wireless battery charging alliance . toyota motor corporation . april 27 2011 . retrieved 24 april 2012 . scott kirsner 2012 09 17 . flying electricity and neighborhood news . boston globe . aristeidis karalis ; j.d. joannopoulos ; marin solja i january 2008 . efficient wireless non radiative mid range energy transfer . annals of physics . 323 34 48 . arxiv physics 0611063 . bibcode 2008anphy .323 ... 34k . doi 10.1016 j.aop .2007.04.017 . published online april 2007 electrical recharging using electrosmog magmimo reference articles edit andre kurs ; aristeidis karalis ; robert moffatt ; j.d. joannopoulos ; peter fisher ; marin solja i july 2007 . wireless power transfer via strongly coupled magnetic resonances . science . 317 5834 83 86 . bibcode 2007sci ... 317 ... 83k . doi 10.1126 science .1143254 . pmid 17556549 . published online june 2007 external links edit eric giler demos wireless electricity . ted . supporting online material for wireless power transfer via strongly coupled magnetic resonances . science magazine . anuradha menon 2008 11 14 . intel s wireless power technology demonstrated . the future of things e magazine . retrieved from https en.wikipedia.org w index.php title witricity & oldid 738414097 categories energy 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