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Apparatus and method for changing magnetic flux density and receiving wireless power

  • US 9,979,233 B2
  • Filed: 05/08/2015
  • Issued: 05/22/2018
  • Est. Priority Date: 02/16/2015
  • Status: Active Grant
First Claim
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1. An apparatus for receiving wireless power from an apparatus for transmitting the wireless power, the apparatus for receiving the wireless power comprising:

  • a coil to receive the wireless power and wound to have a hollow portion; and

    a metal member disposed within the hollow portion, that varies a magnetic flux density of the wireless power transmitting apparatus and is sensed by the apparatus for transmitting the wireless power by the variation of the magnetic flux density,wherein the metal member includes a stainless steel plate,wherein the coil includes any one of a winding coil structure and a lead frame coil structure, andwherein a ratio of an area of the metal member to the hollow portion of the lead frame coil is in a range of 44% to 100%, and a ratio of an area of the metal member to the hollow portion of the winding coil structure is in a range of 22% to 50%.

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