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Primary coil circuit for wireless power transfer, ground assembly using the same, and manufacturing method therefor

  • US 10,411,515 B2
  • Filed: 03/16/2017
  • Issued: 09/10/2019
  • Est. Priority Date: 03/24/2016
  • Status: Active Grant
First Claim
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1. A primary coil circuit of a ground assembly for wirelessly transferring power to a secondary coil, the primary coil circuit comprising:

  • a primary coil magnetically coupled to the secondary coil and having a first terminal and a second terminal;

    a second capacitor having a first terminal and a second terminal connected to the first terminal of the primary coil;

    a first inductor having a first terminal coupled to a first input terminal of a power source and a second terminal coupled to the first terminal of the second capacitor; and

    a first capacitor having a first terminal coupled commonly to the second terminal of the first inductor and the first terminal of the second capacitor and a second terminal coupled commonly to the second terminal of the primary coil and a second input terminal of the power source,wherein a first inductance of the first inductor is smaller than a second inductance of the primary coil, and the first inductance is calculated by multiplying the second inductance of the primary coil and a value obtained by dividing a second capacitance of the second capacitor by a sum of a first capacitance of the first capacitor and the second capacitance of the second capacitor.

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