A team of MIT professors then developed what they call “resonant power transfer,” in which a power coil is able to wirelessly transfer electricity to another device containing a similar coil set to the same frequency.
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Wireless electricity to soon power cell phones, cars, heart pumps - 0 views
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For example, in February, Toyota announced it began testing a wireless recharging station for its hybrid cars in which the vehicle would power up by parking over a charging pad on the ground.
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Giles says that if the hurdle of transferring electricity over greater physical distances can be crossed, then wireless electricity would quickly replace the world of cables. And after the technology is in place, manufacturers would then have to install the equipment allowing for the wireless electric transfer to take place.
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Wireless electricity to soon power cell phones, cars, heart pumps
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WiTricity is also developing technology for wireless charging of electric vehicles and, later, for use in implanted medical devices like heart pumps, said Katie Hall, its chief technology officer.
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The technology is based on magnetic induction -- the process used to recharge electric toothbrushes. In the toothbrush, the base has a magnetic coil that generates a magnetic field. A second coil in the toothbrush captures some of that field, inducing an electric current.But electric toothbrushes transfer power only from the primary coil to the secondary one at very close range. Move the brush a short distance from the base, and it won't charge.
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WiTricity has signed a technology transfer and licensing agreement with MediaTek, a semiconductor company in Taiwan, to collaborate on systems for wireless charging of mobile handsets, tablet computers, game controllers and other devices, Mr. Giler said.
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Wireless electricity? It's here - CNN.com - 0 views
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What's the trick?
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Wireless homes Don't worry about getting zapped: Hall assures that the magnetic fields used to transfer energy are "perfectly safe" -- in fact, they are the same kind of fields used in Wi-Fi routers.
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Plans for use in future homes, a wire-free energy tranfer throughout the homes.
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In the house of the future, wire-free energy transfer could be as easy as wireless internet. If all goes to WiTricity's plans, smartphones will charge in your pocket as you wander around, televisions will flicker with no wires attached, and electric cars will refuel while sitting on the driveway.
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WiTricity have already demonstrated their ability to power laptops, cell-phones, and TVs by attaching resonator coils to batteries -- and an electric car refueller is reportedly in the works.
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When Hall first saw the wireless bulb, she immediately thought of medical technology -- seeing that devices transplanted beneath the skin could be charged non-intrusively.
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WiTricity is now working with a medical company to recharge a left-ventricular assist device -- "a heart-pump essentially." The technology opens the door to any number of mobile electronic devices which have so far been held back by limited battery lives.
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What's next? The challenge now is increasing the distance that power can be transferred efficiently. This distance -- Hall explains -- is linked to the size of the coil, and WiTricity wants to perfect the same long-distance transfers to today's small-scale devices. For this reason, the team have high hopes for their new creation: AA-sized wirelessly rechargeable batteries. For Hall, the applications are endless: "I always say kids will say: 'Why is it called wireless?'" "The kids that are growing up in a couple of years will never have to plug anything in again to charge it."
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Dr Katie Hall is developing ways to transfer power without wires In the home of the future, wireless energy will be as common as Wi-Fi Internet, she believes The technology could lead to new and revolutionary medical devices
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Katie Hall
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*UPDATE (March 17)
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It's great to see so much discussion of this technology on social media and the comments thread. There seems to be a lot of interest in the contribution of Nikola Tesla's experiments to the development of this technology. Dr Hall discussed Tesla briefly in her interview with Nick Glass: Nick Glass: Given that Tesla and others realized all this over a Century ago, why's it taken so long? Dr Hall: I don't think they realized exactly what we've done. They were certainly dreaming of wireless power -- there's no question about that. In those days, it was a different problem, because they were really thinking about: how do they get the power from where it's generated to where it's used. And in that case they might have been thinking about Niagara Falls generating the power and getting it to New York City -- and that's a long distance. We're not proposing that the technology we have here at WiTricity would be used for that kind of application. When we came around, power's already being transferred by wires to homes and rooms and things of that nature, so we had a much different problem, which was really just this much shorter distance. As WiTricity have mentioned on their website the Highly Resonant Wireless Power Transfer technology they have developed is also distinct from Tesla's creations -- and, crucially, is efficient enough to be economically viable.
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