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Method and apparatus for contactless power transfer

  • US 8,674,551 B2
  • Filed: 06/08/2009
  • Issued: 03/18/2014
  • Est. Priority Date: 06/06/2008
  • Status: Active Grant
First Claim
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1. An apparatus for wireless power transfer, comprising:

  • a rectifier stage, wherein the rectifier stage is adapted to interconnect with a load;

    a secondary coil, wherein the secondary coil is interconnected with the rectifier stage;

    a primary coil, wherein the primary coil is coupled to the secondary coil;

    a tuned switch-mode supply, wherein the tuned switch-mode supply is interconnected to the primary coil;

    a power supply, wherein the power supply supplies power to the tuned switch-mode supply;

    first impedance transformation network circuitry interconnected between the tuned switch-mode supply and the primary coil; and

    second impedance transformation network circuitry interconnected between the secondary coil and the rectifier stage, wherein a phase angle of an input impedance of the first impedance transformation circuitry is correlated with an amount of power output to the load.

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