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Contactless power feeding apparatus and contactless power feeding system

  • US 9,905,358 B2
  • Filed: 10/29/2014
  • Issued: 02/27/2018
  • Est. Priority Date: 10/31/2013
  • Status: Active Grant
First Claim
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1. A contactless power feeding apparatus comprising:

  • a power source portion capable of changing a feeding voltage value;

    a power feeding coil generating a power feeding magnetic field by supply of an AC thereto from the power source portion;

    a power feeding apparatus side control portion controlling the feeding voltage value of the power source portion; and

    a communication portion communicating with a power receiving apparatus, whereinthe power feeding apparatus side control portion that acquires a coupling coefficient between the power feeding coil and a power receiving coil provided outside, receiving electric power through the power feeding magnetic field of the power feeding coil, and performs feeding voltage control in order to control the feeding voltage value of the power source portion on the basis of the coupling coefficient; and

    the power feeding apparatus side control portion performs control of acquiring an inductance of the power receiving coil and a receiving AC voltage value that is a value of an AC voltage of the power receiving coil received through the power feeding magnetic field from the power receiving apparatus through the communication portion and calculating the coupling coefficient on the basis of the inductance and the receiving AC voltage value of the power receiving coil that are acquired, an inductance of the power feeding coil, and the feeding voltage value of the power source portion.

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