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Wireless power transmission system

  • US 8,970,070 B2
  • Filed: 06/28/2011
  • Issued: 03/03/2015
  • Est. Priority Date: 07/02/2010
  • Status: Active Grant
First Claim
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1. A wireless power transmission unit that transmits power wirelessly from a power transmitting section to a power receiving section through a resonant magnetic field, the unit comprising:

  • the power transmitting section configured to resonate at a resonant frequency f0;

    a plurality of relay sections each including at least one antenna which is able to be wirelessly coupled to the resonant magnetic field generated by the power transmitting section and which is able to resonate at a frequency that is selected from multiple frequencies including the resonant frequency f0; and

    a resonance control section configured to output resonance condition information that specifies a resonance condition to be imposed on the relay sections according to the arrangement of the power receiving section and control the resonance condition imposed on the relay sections in accordance with the resonance condition information, wherein;

    the plurality of relay sections includes a first relay section and a second relay section which is located on a same side of the power transmitting section as the first relay section and farther from the power transmitting section than the first relay section is; and

    when the power receiving section is coupled to the resonant magnetic field generated by the power transmitting section, when the first relay section is located closer to the power transmitting section than the power receiving section is, and when the second relay section is located farther from the power transmitting section than the power receiving section is, the resonance control section makes the first relay section resonate at the resonant frequency f0 so that the first relay section receives power transmitted by the power transmitting section and transmits the power to the receiving section, and prevents the second relay section from resonating at the resonant frequency f0.

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