INDUCED POWER TRANSMISSION CIRCUIT

  • US 20100213770A1
  • Filed: 09/15/2008
  • Published: 08/26/2010
  • Est. Priority Date: 09/17/2007
  • Status: Active Grant
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First Claim
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1. An inductive electric power transfer circuit, comprising:

  • a transmitter antenna connected with a series power supply circuit that supply electric power at angular frequency ω

    ;

    a receiver antenna connected with a series load circuit that consume the electric power;

    capacitance C1 which is connected between both ends of the transmitter antenna; and

    capacitance C2 which is connected between both ends of the receiver antenna;

    wherein distance between the transmitter antenna and the receiver antenna is not greater than ½

    /2π

    wavelengths of electromagnetic field at the angular frequency ω

    , the transmitter antenna has effective self-inductance L1, and the receiver antenna has effective self-inductance L2, the magnetic inductive coupling factor between the transmitter antenna and the receiver antenna is represented by the symbol k, and wherein with a phase angle β

    that is not less than zero and not greater than pi, the angular frequency ω

    is reciprocal of square root of L2×

    C2×

    (1+k×

    cos (β

    )), the power supply circuit has output impedance of k ω

    L1×

    sin (β

    )≡

    r1, and the load circuit has input impedance of kω

    L2×

    sin (β

    )≡

    r2, thereby efficiently transferring power from the power supply circuit to the load circuit through space.

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