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Wireless power transmission system for selectively powering one or more of a plurality of receivers

  • US 9,143,010 B2
  • Filed: 12/21/2011
  • Issued: 09/22/2015
  • Est. Priority Date: 12/28/2010
  • Status: Active Grant
First Claim
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1. A wireless power transmission system which performs non-contact power transmission from a wireless power feeder selectively to one or more of a plurality of wireless power receivers, each of the plurality of wireless power receivers being provided with a lamp unit,each of the plurality of wireless power receivers comprising a power receive resonance circuit including a power receive coil and a power receive capacitor, and having a resonance frequency, andthe wireless power feeder comprising a power feed coil and a control circuit, the control circuit including a high-frequency amplifier and a micro-computer, the high-frequency amplifier supplying AC power to the power feed coil at a drive frequency according to an instruction from the micro-computer, whereinthe micro-computer switches the drive frequency to a frequency that is programmed in advance, in a short period of time;

  • the drive frequency is time divided;

    the control circuit in the wireless power feeder performs power feeding selectively to a wireless power receiver of the plurality of wireless power receivers by changing frequency of the AC power to the frequency that coincides with the wireless power receiver to cause residual image effect between adjacent periods of divided timethe power receive resonance circuits in the plurality of wireless power receivers have approximately the same resonance frequency,the power receive coils in the plurality of wireless power receivers are disposed in distances different from one another from the power feed coil, respectively,an area encompassed by windings of the power receive coil in each of the plurality of wireless power receivers is equal to or larger than ¼

    of an area encompassed by windings of the power feed coil, andthe micro computer is programmed in advance with the frequency that corresponds to a relative distance between (i) the power receive coil of each of the plurality of wireless power receivers and (ii) the power feed coil.

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