Invention Application
- Patent Title: METHOD AND SYSTEM FOR DRIVING A CAPACITIVE SENSOR
- Patent Title (中): 用于驱动电容式传感器的方法和系统
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Application No.: US15121982Application Date: 2015-03-12
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Publication No.: US20170075019A1Publication Date: 2017-03-16
- Inventor: Mirko Pribisic , Allan Corner , Xiaoping Hu , Mike Akbari , Timothy Dezorzi
- Applicant: Magna Closures Inc.
- International Application: PCT/CA2015/000157 WO 20150312
- Main IPC: G01V3/08
- IPC: G01V3/08 ; E05F15/73 ; E05F15/46

Abstract:
A method for determining a capacitance value of a capacitive sensor begins by applying a sensor signal (Vx) to the capacitive sensor. The sensor signal (Vx) includes a number of charge-discharge pulse pairs distributed over a first period of time (T/N), with each pulse pair having a different pulse period. The method then proceeds by accumulating a number (N) of samples of a reference voltage (Vs) measured across a reference capacitor (Cs) that is coupled to the capacitive sensor over a second period of time (T) to produce an accumulated capacitance value (ACCUMULATED). The accumulated capacitance value (ACCUMULATED) is then divided by the number (N) of the samples to determine the capacitance value (Cx) of the capacitive sensor.
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