发明名称 |
Method and apparatus for detecting a change in capacitance of a capacitive proximity sensor |
摘要 |
A method for detecting a change in capacitance of a capacitive sensing element having a nominal capacitance value is disclosed. In an exemplary embodiment, the method includes coupling the sensing element to a first oscillator, the first oscillator generating a first frequency dependent upon the capacitance value of the sensing element. The first frequency is compared to a reference frequency generated by a second oscillator. The change in capacitance from the nominal capacitance value is detected if the first frequency differs from said reference frequency by a determined frequency value.
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申请公布号 |
US2003071639(A1) |
申请公布日期 |
2003.04.17 |
申请号 |
US20020142641 |
申请日期 |
2002.05.10 |
申请人 |
HAAG RONALD HELMUT;PASIECZNIK JOHN |
发明人 |
HAAG RONALD HELMUT;PASIECZNIK JOHN |
分类号 |
E05F15/00;H03K17/955;H03K17/96;(IPC1-7):G01R27/26 |
主分类号 |
E05F15/00 |
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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