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    • 10. 发明申请
    • ELECTRONIC CIRCUIT FOR CONTROLLING A CAPACITIVE PRESSURE SENSOR AND CAPACITIVE PRESSURE SENSOR SYSTEM
    • 用于控制电容式压力传感器和电容式压力传感器系统的电子电路
    • WO2009130626A1
    • 2009-10-29
    • PCT/IB2009/051405
    • 2009-04-03
    • NXP B.V.LUTZ, Josef
    • LUTZ, Josef
    • G01L9/12
    • G01L9/12
    • An electronic circuit (10) for controlling a capacitive pressure sensor (1), which capacitive pressure sensor (1) comprises a plate electrode capacitor (C) with a capacity that varies in dependence on pressure changes exerted on a deflectable diaphragm (2) forming one plate electrode of the capacitor (C), wherein the electronic circuit (10) comprises a DC voltage source (12) being adapted to generate a DC bias-voltage (UDC) to be applied across the electrodes of the capacitor (C), an AC voltage source (13) being adapted to generate an AC voltage signal (UAC) to be applied across the electrodes of the capacitor (C) and a controller (18) being adapted to receive an output signal (OUT) of the capacitor (C) and to control the DC voltage source (12) such that the DC bias-voltage (UDC) applied to the capacitor (C) adopts a value that maintains the capacity of the capacitor (C) at a desired value.
    • 一种用于控制电容式压力传感器(1)的电子电路(10),该电容式压力传感器(1)包括板电极电容器(C),该电容电容器(C)具有根据施加在形成的可偏转隔膜(2)上的压力变化而变化的能力 电容器(C)的一个平板电极,其中电子电路(10)包括适于产生跨过电容器(C)的电极施加的DC偏置电压(UDC)的DC电压源(12) 交流电压源(13)适于产生要施加在电容器(C)两端的电压的AC电压信号(UAC);以及控制器(18),适于接收电容器的输出信号(OUT) C)并且控制DC电压源(12),使得施加到电容器(C)的DC偏置电压(UDC)采用将电容器(C)的容量保持在期望值的值。