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Foreign matter detection device and method for wireless power supply device

  • US 9,950,636 B2
  • Filed: 09/28/2015
  • Issued: 04/24/2018
  • Est. Priority Date: 07/16/2013
  • Status: Active Grant
First Claim
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1. A foreign matter detection device for a wireless power supply device, comprising:

  • a detection coil positioned between a power transmitting coil and a power receiving coil; and

    a detection unit which detects an induced voltage generated in the detection coil and detects, from the detected induced voltage, presence or absence of a conductive foreign matter positioned between the power transmitting coil and the power receiving coil,wherein the detection coil comprises a continuous conductive wire in which two loop portions are wound in mutually opposite directions,a center part of the detection coil is positioned off a center axis of the power transmitting coil, and is positioned off a center axis of the power receiving coil, andan area or a winding number of each of the loop portions or a direction connecting centroids of the two loop portions is set so that an induced voltage generated in the detection coil when a conductive foreign matter is not present becomes 0 or a minimum.

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