Wireless power transfer using separately tunable resonators

  • US 9,634,495 B2
  • Filed: 11/24/2014
  • Issued: 04/25/2017
  • Est. Priority Date: 02/07/2012
  • Status: Active Grant
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First Claim
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1. A system for wireless energy transfer, the system comprises:

  • a resonator circuit for wireless transmission of energy, the resonator circuit comprising;

    a transmitter coil having a large number of windings N1;

    a variable capacitance device connected in shunt across the transmitter coil with the transmitter coil and the variable capacitor and intrinsic capacitance of the transmitter coil forming the resonator circuit; and

    an input coil configured to be coupled to an input RF source, with the input coil having a low number of windings N2 compared to the number of windings N1 of the transmitter coil, and the input coil being inductively coupled to the transmitter coil to provide power output from the circuit with the resonator circuit having a resonant frequency in a range of about 100 kHz to 30 MHz; and

    a circuit inductively coupled to the resonator circuit to effectively produce a rectified voltage having a DC component, wherein the circuit inductively coupled to the resonator circuit comprises at least one of;

    (i) a tunable passive resonator tuned to a harmonic of the resonant frequency or (ii) a magnetic field transmitter operating at the first harmonic or higher harmonic of the base transmitter frequency.

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