Invention Grant
- Patent Title: Plural-frequency capacitive occupancy sensing system
- Patent Title (中): 多频电容占用传感系统
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Application No.: US13554242Application Date: 2012-07-20
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Publication No.: US08994385B2Publication Date: 2015-03-31
- Inventor: Michael Virnich , David Hoyer , Martin Thinnes , Michael Puetz , Thomas Meyers
- Applicant: Michael Virnich , David Hoyer , Martin Thinnes , Michael Puetz , Thomas Meyers
- Applicant Address: LU Luxembourg
- Assignee: IEE International Electronics & Engineering S.A.
- Current Assignee: IEE International Electronics & Engineering S.A.
- Current Assignee Address: LU Luxembourg
- Agency: Cantor Colburn LLP
- Priority: LU91843 20110720
- Main IPC: G01R27/26
- IPC: G01R27/26 ; G01R19/00 ; B60N2/00 ; B60N2/56 ; B60R21/015

Abstract:
A plural-frequency capacitive occupancy sensing system comprises an antenna electrode and a detection circuit, which is configured to drive the antenna electrode at least with a first and a second signal at a first and a second frequency, respectively, so as to obtain at least a first and a second measurement value indicative of at least one of conductance, susceptance, resistance, reactance and capacitance between the antenna electrode and a reference node, at the first frequency and the second frequency, respectively. The detection circuit compares the capacitance between the antenna electrode and the reference node with a threshold capacitance, the threshold capacitance being derived from a difference between the first and second measurement values and/or the capacitance between the antenna electrode and the reference node being corrected based upon the difference between the measurement values. The detection circuit outputs an occupancy state signal depending on the comparison.
Public/Granted literature
- US20130021045A1 PLURAL-FREQUENCY CAPACITIVE OCCUPANCY SENSING SYSTEM Public/Granted day:2013-01-24
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