Wireless power transmission presented at CES

January 29, 2007 at 14:35 Leave a comment

Cut those wires…

At the recent Consumer Electronics Show, a couple of high-tech companies presented a demo of wireless power transmission. The technology (inductive charging) is under development for some time already, but now the first commercially available products start to emerge.

One of the presented products is an induction charging pad. It enables you to recharge the batteries of your mobile phone, MP3 player or even a laptop, just by putting the device on the pad. Note: it does require a miniature “receiver”, wich sticks to the battery.

A second development goes literally a step further – by using “sender” and “receiver” antenna’s, it allows devices to charge while beeing a couple of meters apart.

Inductive charging is a way to recharge portable electronics batteries without plugging in any cords. It generally charges too slowly and generates too much heat for portable electronics, though it is common in electric toothbrushes and some wet/dry electric shavers.

An induction coil creates an alternating electromagnetic field across the surface of the base station. The induction coil in the portable device takes power from the field and converts it back into electrical current to charge the battery.

In November 2006, however, researchers at MIT reported that they had discovered an efficient way to transfer power between coils separated by a few meters. The team, led by Marin Soljacic, theorized that they could extend the distance between the coils by adding resonance to the equation.

Source: Wikipedia & BBC


Entry filed under: Technology.

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