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Electric power transmission system with power transmission and receiving antennas

  • US 9,866,068 B2
  • Filed: 08/30/2013
  • Issued: 01/09/2018
  • Est. Priority Date: 09/28/2012
  • Status: Active Grant
First Claim
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1. An electric power transmission system, comprising:

  • a power transmission antenna that constitutes a series resonator with an inductance component of L1 and a capacitance component of C1, and to which AC power is input;

    an inverter unit that converts DC voltage to AC voltage of a predetermined frequency to output to the power transmission antenna, the output of the inverter unit being input directly to the series resonator of the power transmission antenna;

    a power receiving antenna that constitutes a series resonator electromagnetically coupled to the series resonator of the power transmission antenna, the series resonator of the power receiving antenna having an inductance component of L2 and a capacitance component of C2, and which receives electromagnetic energy from the series resonator of the power transmission antenna via electromagnetic fields;

    a rectifying unit that rectifies an output of the power receiving antenna to output DC power; and

    a load to which an output of the rectifying unit is input, whereinthe following relationships are established;


    L1C1=L2C2



    (Formula

         2);


    and
    L1/C1>

    L
    2/C2



    (Formula

         6),whereinand a coupling coefficient between the power transmission antenna and the power receiving antenna is denoted as k,the resistance value of the load is denoted by R, where the resistance value of the load R varies from a minimum resistance value of Rmin to a maximum resistance value of Rmax, andthe following relationship is established;

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