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Harmonic reduction apparatus for wireless power transfer systems

  • US 9,991,779 B2
  • Filed: 01/06/2015
  • Issued: 06/05/2018
  • Est. Priority Date: 01/07/2014
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a switch network coupled to a power source, wherein the switch network comprises a plurality of power switches;

    a primary resonant tank coupled to the plurality of power switches, wherein the primary resonant tank comprises at least a resonant capacitor;

    a transmitter coil coupled to the primary resonant tank, wherein;

    the transmitter coil is configured to be magnetically coupled to a receiver coil; and

    the transmitter coil and the receiver coil are configured such that wireless power is transferred from the transmitter coil to the receiver coil; and

    a harmonic reduction apparatus coupled between the switch network and the transmitter coil, wherein the harmonic reduction apparatus comprises a magnetic element and a capacitive element connected in series and further diagonally connected between an input terminal of the primary resonant tank and an output terminal of the primary resonant tank, and wherein the harmonic reduction apparatus is configured to;

    attenuate at least one undesired frequency component of a current in the transmitter coil.

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