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公开(公告)号:US20170075019A1
公开(公告)日:2017-03-16
申请号:US15121982
申请日:2015-03-12
Applicant: Magna Closures Inc.
Inventor: Mirko Pribisic , Allan Corner , Xiaoping Hu , Mike Akbari , Timothy Dezorzi
CPC classification number: G01V3/088 , E05F15/46 , E05F15/73 , E05Y2900/546 , G01V3/08
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.
Abstract translation: 用于确定电容式传感器的电容值的方法开始于对电容式传感器施加传感器信号(Vx)。 传感器信号(Vx)包括在第一时间段(T / N)上分布的多个充电 - 放电脉冲对,每个脉冲对具有不同的脉冲周期。 该方法然后通过累加在第二时间段(T)上耦合到电容传感器的参考电容器(Cs)两端测量的参考电压(Vs)的数量(N)的样本进行,以产生累积的电容值 (积累)。 然后将累积电容值(ACCUMULATED)除以采样数(N),以确定电容式传感器的电容值(Cx)。