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DATE PUBLISHED: 2014/4/22 - 10:57:36
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Wirelessly chargeable smartphones in offing
Wirelessly chargeable smartphones in offing

The concept of using wireless technology to charge up smartphones is attracting more takers, with the notion using already-existing technology as a platform.

Such means of powering up the smartphone would require one to place the device on a charging station -- a way of charging already used for chargeable toothbrushes.

"You just have to lay the device on the station to start charging, without the bother of a cable," notes Alexander Spier of German computer magazine c't.

The charging station would itself have to remain plugged in.

"...the principle is actually humdrum," says Juergen Haase, a professor of physics at the University of Leipzig.

"It's not really cable-free," says Soenke Harm, a physicist at the University of Kiel. "Better said, it's 'socket-free charging.'"

One advantage is that a lot of modern devices do not leave a lot of physical space left over for a space to connect a cable that is both small and robust.

"With those kinds of small sockets, you can quickly see dirt accumulate on the contacts, which leads to contact problems, breaks in the cable or mechanical problems with the socket," says Harm.

The downside, however, is longer and more energy-consuming charging.

"Charging takes longer, since you can transmit energy much more effectively with a cable," says Haase. "Our tests showed that, depending on the kind of smartphone, it could take from a third to 50 per cent longer for charging."

 

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