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posted by janrinok on Monday August 03 2015, @02:21PM   Printer-friendly
from the charge! dept.

Now researchers from North Carolina State University and Carnegie Mellon University say they have hit upon a way to boost the efficiency of the energy transfer in that [wireless transfer] situation. They reported, in a paper published in the online edition of the journal IEEE Antennas and Wireless Propagation Letters, that by placing a magnetic resonance field enhancer (MRFE)—a loop of copper wire resonating at the same frequency as the AC current feeding the transmitter coil—between the transmitter and receiver coil, they could boost the transmission efficiency by at least 100 percent. "Our experimental results show double the efficiency using the MRFE in comparison to air alone," David Ricketts of NC State, said in a press release. The MRFE increases the strength of the magnetic field that reaches the receiver coil, resulting in an increase of the transmission efficiency.
...
For their experimental setup, the team used two coils of 4.25-centimeter- diameter copper wire with six turns for the transmitter and receiver coils. The coils were separated by 12.2 cm and the transmitter coil was powered with a 2.94-megahertz signal. They measured the transmission efficiency by placing a metamaterial between the transmitter and receiver coil and comparing it with a setup where a single, 12-cm-diameter copper-wire loop replaced the metamaterial. They found that the copper wire version improved the efficiency by a factor of almost two.

Does wireless charging solve any problems that an industry-adopted connector standard wouldn't?


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  • (Score: 2) by hemocyanin on Monday August 03 2015, @02:49PM

    by hemocyanin (186) on Monday August 03 2015, @02:49PM (#217412) Journal

    Worn out contacts in the device to be charged, making charging unreliable.

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  • (Score: 4, Interesting) by danmars on Monday August 03 2015, @02:56PM

    by danmars (3662) on Monday August 03 2015, @02:56PM (#217415)

    Not just worn out contacts - prevents broken connectors and corrosion, and allows for better waterproofing. And then there are the cosmetic possibilities.

    • (Score: 1, Interesting) by Anonymous Coward on Monday August 03 2015, @03:09PM

      by Anonymous Coward on Monday August 03 2015, @03:09PM (#217417)

      Waterproofing was also my first thought. Basically, most devices have at most two reasons for connectors: Power, and data. For data, we already have connector-less solutions (bluetooth, WiFi), but power up to now still needs a connector. With that last connector also gone, you can make devices which are completely sealed, with no need to ever open that sealing during normal operation.