VIEWS: 26 PAGES: 7 CATEGORY: Emerging Technologies POSTED ON: 9/24/2010
Israel Powermat has developed a wireless power supply, this is called "Power Pad" wireless power can be achieved through the power transmission of electromagnetic waves, thus eliminating the need for connecting the power cord and power outlet of trouble. Polya King said the company's CEO, this works a bit like the power of the RFID tag. RFID readers and tags are usually constituted by the reading device used to form the magnetic field around the antenna, transmitter frequency tuning and reader "tags" to get energy from the magnetic field is converted to electrical signals sent to the following reader. This power supply also has a wireless equivalent of "reader" of the base and an electromagnetic wave into the current "label", but its base is a few millimeters thick mats, may need to determine the size, can be placed on the table , can also be mounted on the kitchen table surface or wall, to carry it through the electromagnetic field "label" the electrical power transmission, as long as with the "label" of the electrical pads placed on or near the pad, you can get electricity.
www.sciencemag.org/cgi/content/full/1143254/DC1 Supporting Online Material for Wireless Power Transfer via Strongly Coupled Magnetic Resonances André Kurs,* Aristeidis Karalis, Robert Moffatt, J. D. Joannopoulos, Peter Fisher, Marin Soljačić *To whom correspondence should be addressed. E-mail: firstname.lastname@example.org Published 7 June 2007 on Science Express DOI: 10.1126/science.1143254 This PDF file includes: SOM Text Figs. S1 to S5 Effect of using capacitively-loaded loops and lowering the op- erating frequency on ﬁeld strengths and power levels As stated in the text, capacitively-loaded loops generate signiﬁcantly lower electric ﬁelds in the space surrounding the objects than self-resonant coils. We have performed calculations to sim- ulate a transfer of 60W across two identical capacitively-loaded loops (6) similar in dimension to our self-resonant coils (radius of loop 30cm, cross sectional radius of the conductor 3cm, and distance between the loops of 2m), and calculated the maximum values of the ﬁelds and Poynting vector 20cm away from the device loop. Frequency (MHz) η Erms (V/m) Hrms (A/m) Srms (W/cm2 ) Power radiated (W) 10 83% 185 21 0.08 3.3 1 60% 40 14 0.04 0.005 At 10MHz, note the signiﬁcant reduction in the electric ﬁeld strength with respect to the self- resonant coils. Lowering the operating frequency down to 1MHz further reduces the electric ﬁeld, Poynting vector, and power radiated. At 1MHz, all our ﬁelds are below IEEE safety guidelines (18) (Erms = 614V/m, Hrms = 16.3A/m, and Srms = 0.1W/cm2 at 1MHz.) 2 Figures 0.18 Theory 0.16 Experiment 0.14 0.12 κ (10e6/s) 0.1 0.08 0.06 0.04 0.02 0 75 100 125 150 175 200 225 Distance (cm) Figure 1: Theoretical and experimental κ as a function of distance when one of the coils is rotated by 45% with respect to coaxial alignment. 3 0.1 Theory 0.09 Experiment 0.08 0.07 0.06 κ (10e6/s) 0.05 0.04 0.03 0.02 0.01 0 100 125 150 175 200 225 Distance (cm) Figure 2: Theoretical and experimental κ as a function of distance when the coils are coplanar. 4 Figure 3: 60W light-bulb being lit from 2m away. Note the obstruction in the lower image. 5 Figure 4: 60W light-bulb. Alternate angle. 6 Figure 5: Alternative geometry. 7
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