发明名称 |
SYSTEMS, METHODS, AND APPARATUS FOR DETECTION OF METAL OBJECTS IN A PREDETERMINED SPACE |
摘要 |
This disclosure provides systems, methods and apparatus for detecting foreign objects. In one aspect an apparatus for detecting a presence of an object is provided. The apparatus includes a resonant circuit having a resonant frequency. The resonant circuit includes a sense circuit including an electrically conductive structure. The apparatus further includes a coupling circuit coupled to the sense circuit. The apparatus further includes a detection circuit coupled to the sense circuit via the coupling circuit. The detection circuit is configured to detect the presence of the object in response to detecting a difference between a measured characteristic that depends on a frequency at which the resonant circuit is resonating and a corresponding characteristic that depends on the resonant frequency of the resonant circuit. The coupling circuit is configured to reduce a variation of the resonant frequency by the detection circuit in the absence of the object. |
申请公布号 |
US2014015329(A1) |
申请公布日期 |
2014.01.16 |
申请号 |
US201313791585 |
申请日期 |
2013.03.08 |
申请人 |
QUALCOMM INCORPORATED |
发明人 |
WIDMER HANSPETER;BITTNER MARKUS;SIEBER LUKAS;FISCHER MARCEL |
分类号 |
G01D5/20;H01F38/14 |
主分类号 |
G01D5/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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