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WiTricity vows wireless power in 1.5 years

updated 05:00 pm EDT, Fri July 24, 2009

WiTricity wireless power

At the TED Global Conference in Oxford, UK wrapping up today, US-based WiTricity showed off a wireless charging system that powered up a T-Mobile G1, Apple's iPhone and a flat screen TV. Such a system could eventually replace the current infrastructure that involves countless miles of power cable and disposable alkaline batteries. According to a recent BBC report, the system is based on research by a physicist at the Massachusetts Institute of Technology (MIT), Marin Soljacic. It uses low frequency electromagnetic wave resonance to transfer the energy from the source to the device via a coil at each end.

Each of the coils is engineered to have the same resonant frequency. Each cycle of energy arriving at the receiving coil produces a voltage that can charge the gadget. Devices so equipped automatically charge when they are in the range of the main charging coil, so there's never a need to plug devices in. The energy is transferred via magnetic fields, so there is no danger or interference with other devices, the demo showed. Because of the near field effect -- less than one wavelength -- there is no potentially dangerous electric fields, but only magnetic waves. The electromagnetic waves are only about 100ft long, and shorter wavelengths would not work.

The demo had a G1 that looked no different than the regular headset, as all the necessary components were integrated into the body of the device. Apple's iPhone required an add-on sleeve module, as space inside the headset is at a premium.

WiTricity's chief executive, Eric Giler, envisions his company's technology to be used to charge all types of devices, from cellphones and notebooks to pacemakers and electric cars.

By Electronista Staff
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  1. MacOS

    Junior Member

    Joined: Aug 2002


    Cancer Anyone?

    Great, that's all we need is more emi to screwup our cells causing cancer. Funny how they say mobile phones are safe but the number of brain tumors cases is up. If they are safe then why the disclaimer in the manual?

    The more you know . . .

  1. tortenteufel

    Fresh-Faced Recruit

    Joined: Jul 2007



    Great! Turns your house into one giant microwave oven. Honey, the kids are done !

  1. ScottG

    Fresh-Faced Recruit

    Joined: Jan 2005


    A Side of Tumors Please

    I agree with the above posters here, I get chronic headaches when i have to use the Mobile Phone even for a few minutes. A Doctor told me to use the speaker phone portion from now on, or just give it up and go back to the old way of using the Pay Phone. (Just Great then I get the H1N1 Virus from the Pay Phone, and just die quicker!) Plus when was that last time you saw a Pay Phone anywhere in the last few years. You can forget about a headphone cord, because that just turns your head into a big antenna too.

    Now we have to worry about more EMI in homes and business with this kind of c***! Before long we will need Orange Signs on our front door with the warnings of "Do Not Enter if You Have a Pacemaker, Plate in Your Head, or any Steel Screws in Your Body.

  1. Mike Richardson

    Fresh-Faced Recruit

    Joined: Jun 2009



    You read somewhere that using mobile phones might cause cancer, and now your mind is creating fake headaches.

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