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Wireless power transfer system

  • US 10,243,406 B2
  • Filed: 09/19/2014
  • Issued: 03/26/2019
  • Est. Priority Date: 05/14/2014
  • Status: Active Grant
First Claim
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1. A wireless power transfer system in which a primary coil connected to a high-frequency power source and a secondary coil connected to a load are disposed so as to be isolated from each other with a coupling coefficient k, thereby supplying power from the primary coil to the secondary coil in a non-contact manner, the system comprising:

  • a resonance current phase detection means forming a resonance circuit by connecting a resonance capacitor to the secondary coil and configured to detect phase information of a resonance current flowing through the resonance capacitor;

    a phase information transfer means configured to transfer the detected phase information without phase delay; and

    a driving circuit configured to determine, based on the phase information, a driving frequency so that a current phase of a driving current flowing in the primary coil slightly delays from a voltage phase of a driving voltage applied to the primary coil, thereby driving the primary coil,wherein a Q value determined based on a leakage inductance of the secondary coil, a capacitance of the resonance capacitor, and an equivalent load resistance on the secondary coil side is set to a value greater than or equal to a value determined by Q=2/k2.

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