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Cable-free system to deliver electricity through the air invented
07-24-2009, 01:55 PM,
Cable-free system to deliver electricity through the air invented
From The Times
July 24, 2009
Cable-free system to deliver electricity through the air invented

A system that delivers electricity through the air to power laptops, phones and other electrical devices has been displayed at a technology conference in Oxford.

The technique, which could allow millions of homes and offices to dispense with power cords and disposable batteries, transmits energy via electromagnetic waves.

Developed by the US firm WiTricity, it was shown at the TED Global conference, powering mobile phones and television sets without the use of wires.

The system is based on the work of Professor Marin Soljacic, a physicist at the Massachusetts Institute of Technology. After being woken up three nights in a row by the beeping of his mobile phone, telling him its battery power was low, the Professor wondered: “Why can’t all this electricity in the walls just come out and power my phone?”

The concept of sending power wirelessly, via electromagnetic waves, was not new, but was thought inefficient because the electromagnetic energy radiates in all directions.

Professor Soljacic exploited the principle of “resonance”, whereby energy transfer becomes more efficient when a certain frequency is applied.

When two objects have the same resonant frequency, they exchange energy strongly without having an effect on surrounding objects. Accoustic resonance causes wine glasses to smash when a singer hits a specific note; WiTricity exploits the resonance of low frequency electromagnetic waves.

The company developed a charger with a magnetic coil that resonates at a specific frequency, that can be implanted in wall, floor or ceiling, or beneath a desk. A second magnetic coil, embedded in the phone or laptop, resonates at the same frequency and absorbs energy.

Chief executive Eric Giler said that the wireless transmission of power was safe because the energy was transfered through magnetic fields. “Humans and the vast majority of objects around us are non-magnetic in nature,” he said.;attr=4947818
“Everything Popular Is Wrong” - Oscar Wilde

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Cable-free system to deliver electricity through the air invented - drummer - 07-24-2009, 01:55 PM

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