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    • 9. 发明授权
    • Electronic circuit for measuring a physical parameter supplying an analogue measurement signal dependent upon the supply voltage
    • 用于测量根据电源电压提供模拟测量信号的物理参数的电子电路
    • US08051711B2
    • 2011-11-08
    • US12207689
    • 2008-09-10
    • Sylvain GrosjeanMichel WilleminBeat Pfefferli
    • Sylvain GrosjeanMichel WilleminBeat Pfefferli
    • G01P15/00
    • G01C19/00
    • The electronic circuit for measuring at least one physical parameter supplies an analogue output measurement signal (SA) dependent upon the value of a supply voltage. The circuit includes a sensor interface, connected to a sensor for supplying an analogue measurement signal (Vm) which is then filtered, an analogue-digital converter for digitally converting the filtered signal (Sm), and a digital signal control and processing unit for receiving a converted signal from the converter and supplying a digital measurement signal (SD). The sensor interface, the analogue-digital converter, and the processing unit are powered by a voltage regulator. The analogue and digital measurement signals are thus independent of any variation in the supply voltage (VCC) of the electronic circuit. A ratiometric unit, which may be an analogue multiplier or an analogue-digital converter, is powered by the supply voltage source (Bat) to recreate ratiometry on SA on the basis of Sm or SD.
    • 用于测量至少一个物理参数的电子电路根据电源电压的值提供模拟输出测量信号(SA)。 电路包括传感器接口,连接到用于提供模拟测量信号(Vm)的传感器,然后被滤波,模数转换器用于对滤波信号(Sm)进行数字转换;以及数字信号控制和处理单元,用于接收 来自转换器的转换信号并提供数字测量信号(SD)。 传感器接口,模拟数字转换器和处理单元由电压调节器供电。 因此,模拟和数字测量信号与电子电路的电源电压(VCC)的任何变化无关。 可以是模拟乘法器或模拟数字转换器的比例单元由电源电压源(Bat)供电,以基于Sm或SD在SA上重建比率测量。
    • 10. 发明申请
    • METHOD OF MEASURING A PHYSICAL PARAMETER AND ELECTRONIC INTERFACE CIRCUIT FOR A CAPACITIVE SENSOR FOR IMPLEMENTING THE SAME
    • 用于实现其电容式传感器的物理参数和电子接口电路的测量方法
    • US20110154906A1
    • 2011-06-30
    • US12971403
    • 2010-12-17
    • Sylvain GrosjeanMichel WilleminAlexandre DeschildreBeat Pfefferli
    • Sylvain GrosjeanMichel WilleminAlexandre DeschildreBeat Pfefferli
    • G01L1/14
    • G01P15/125G01D5/24
    • The measuring method is for measuring a physical parameter by means of an electronic interface circuit (1) for a capacitive sensor (2) with at least two capacitors (C1X, C2X) whose common electrode (CM) is mobile between the fixed electrodes. The electronic circuit includes an amplifier (4) connected to the common electrode (CM) by a switching unit (3), a logic unit (5) connected to the amplifier for supplying first and second digital measuring signals, and a digital-analogue converter (7) for supplying a measurement voltage (VDAC) to the electrodes on the basis of a conversion of one of the digital signals. The method consists in polarising firstly the electrodes of the capacitors by the measurement voltage (VDAC) on the basis of the first digital signals, then polarising the fixed electrode of the first capacitor (C1X) at a regulated voltage (VREG) and the fixed electrode of the second capacitor (C2X) at a low voltage (VSS), then polarising the electrodes of the capacitors (C1X, C2X, CM) by the measurement voltage (VDAC) on the basis of the second digital measuring signal, and finally polarising the fixed electrode of the first capacitor (C1X) at a low voltage (VSS) and the fixed electrode of the second capacitor (C2X) at a regulated voltage (VREG). At the end of the measuring cycles, the logic unit is able, on the basis of the first and second obtained digital measuring signals, to remove any voltage offset linked to the electronic components.
    • 该测量方法用于通过具有至少两个公共电极(CM)在固定电极之间移动的电容器(C1X,C2X)的电容式传感器(2)的电子接口电路(1)来测量物理参数。 电子电路包括通过开关单元(3)连接到公共电极(CM)的放大器(4),连接到放大器的逻辑单元(5),用于提供第一和第二数字测量信号,以及数模转换器 (7),用于基于数字信号之一的转换来向电极提供测量电压(VDAC)。 该方法首先通过基于第一数字信号的测量电压(VDAC)首先偏置电容器的电极,然后以第一电容器(C1X)的固定电极以调节电压(VREG)和固定电极 的第二电容器(C2X)的低电压(VSS),然后基于第二数字测量信号使电容器(C1X,C2X,CM)的电极偏移测量电压(VDAC),最后将 低电压(VSS)的第一电容器(C1X)的固定电极和第二电容器(C2X)的固定电极处于调节电压(VREG)。 在测量周期结束时,逻辑单元能够基于第一和第二获得的数字测量信号来去除与电子部件相关联的任何电压偏移。