Invention Grant
- Patent Title: Wireless power transmission apparatus
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Application No.: US16687325Application Date: 2019-11-18
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Publication No.: US11296558B2Publication Date: 2022-04-05
- Inventor: Jihyun Lee , Seonghun Lee , Bongsik Kwak , Joonho Park , Sungkyu Kim
- Applicant: LG ELECTRONICS INC.
- Applicant Address: KR Seoul
- Assignee: LG ELECTRONICS INC.
- Current Assignee: LG ELECTRONICS INC.
- Current Assignee Address: KR Seoul
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: KR10-2018-0142208 20181119
- Main IPC: H02J50/60
- IPC: H02J50/60 ; H02J50/80 ; H02J50/12 ; G01V3/10 ; H01F38/14 ; H02J7/02

Abstract:
A wireless power transmission apparatus can include a resonant circuit including a plurality of coils and a plurality of capacitor elements respectively connected to the plurality of coils; a first sensor configured to sense a change in inductance of each of the plurality of coils; a second sensor configured to sense a change in a quality factor of each of the plurality of coils; and a controller configured to calculate feature values based on an inductance variation and a quality factor variation for detecting a foreign object, and determine the foreign object is present on a charging surface of the wireless power transmission apparatus based on whether a feature value combination selected from among the feature values falls within a reference region on a coordinate plane formed by an intersection of a first axis and a second axis, in which the first axis is based on inductance variation and the second axis is based on quality factor variation.
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