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Boosting the Transfer Efficiency of Wireless Power Transfer Systems

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

Phoenix666 writes:

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: 0) by Anonymous Coward on Monday August 03 2015, @05:21PM

    by Anonymous Coward on Monday August 03 2015, @05:21PM (#217472)

    I see primarly four main uses for wireless charging (compared to standard connector)

    1) Waterproof housing for devices (for instance - consider a camera for underwater use, especially if combined with wifi (this would allow for "factory sealed" units))

    2) "hat rack"/"coat hanger" (if the distance is at least 50cm) - to simply allow all the bluetooth-thingies (headset, headphones, mobile phone, fitbit, smatwatch, smartglasses) be automatically charged when you get home.

    3) "always charged" (if the dustance goes at least 1,5m) - to allow tablets, smartphones and smartwatches to be used more flexibly, and in the case of the smartwatch simply never having to take it off.

    4) outdoor appliances (at least one meter range) - porch light, surveillence/door camera, rfid reader, active antennas and similar with flexible placement without having to puncture the moisture-barrier in the wall. (Also, to allow for an "always charged" audiodevice in the bathroom/shower (voicecontrolled musicplayer, speakerphone, doorbell...)