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    • 4. 发明授权
    • Electrical conductivity module
    • 电导率模块
    • US09500614B2
    • 2016-11-22
    • US14659845
    • 2015-03-17
    • Atlas Scientific LLC
    • Efrem PressJon LindgrenJordan Press
    • G01N27/06G01N27/04
    • G01N27/06G01N27/045
    • A driving circuit for a fluid conductivity sensor includes a pulse width modulation unit, an H-bridge, first and second differential amplifiers, and an analog-to-digital converter (ADC). The pulse width modulation unit generates two opposing driving signals. The H-bridge receives the two opposing driving signals and generates two H-bridge outputs. The first differential amplifier includes first inputs connected in parallel to a shunt resistor. One of the first inputs is coupled to the two generated H-bridge outputs. The second differential amplifier includes second inputs connected in parallel with a pair of terminals having a sensor attached thereto. One of the second inputs and the pair of terminals receive a signal from the other of the two generated H-bridge outputs. The ADC receives a first output representative of a first current from the first differential amplifier; and a second output representative of a second current from the second differential amplifier.
    • 用于流体传导率传感器的驱动电路包括脉冲宽度调制单元,H桥,第一和第二差分放大器以及模数转换器(ADC)。 脉宽调制单元产生两个相对的驱动信号。 H桥接收两个相对的驱动信号,并产生两个H桥输出。 第一差分放大器包括并联连接到分流电阻器的第一输入端。 第一个输入中的一个耦合到两个生成的H桥输出。 第二差分放大器包括与具有附接到其上的传感器的一对端子并联连接的第二输入。 第二输入端和一对端子之一接收来自两个产生的H桥输出中的另一个的信号。 ADC从第一差分放大器接收表示第一电流的第一输出; 以及代表来自第二差分放大器的第二电流的第二输出。
    • 5. 发明授权
    • Electrochemical sensing module
    • 电化学传感模块
    • US09571121B2
    • 2017-02-14
    • US14806079
    • 2015-07-22
    • Atlas Scientific LLC
    • Efrem PressJon LindgrenJordan Press
    • H03M3/00G01N27/416G01R19/00
    • H03M3/464G01N27/4167G01R19/0023H03M3/476H03M3/49H03M3/494
    • A sensing circuit for an electrochemical sensor includes a digital-to-analog converter (DAC), an operational amplifier, an instrumentation amplifier, and an analog-to-digital converter (ADC). The DAC generates a biased ground voltage signal which is received by the operational amplifier. The operational amplifier creates a high current biased voltage on one of a pair of terminals connected to the electrochemical sensor. The instrumentation amplifier receives a signal from the pair of terminals, and generates an output representative of a voltage across the pair of terminals with reference to the high current biased ground voltage signal. The ADC converter receives the output and derives an actual voltage reading taken by the electrochemical sensor.
    • 用于电化学传感器的感测电路包括数模转换器(DAC),运算放大器,仪表放大器和模数转换器(ADC)。 DAC产生由运算放大器接收的偏置接地电压信号。 运算放大器在连接到电化学传感器的一对端子之一上产生高电流偏置电压。 仪表放大器接收来自该对端子的信号,并参照高电流偏置接地电压信号产生代表该对端子两端的电压的输出。 ADC转换器接收输出并导出电化学传感器采集的实际电压读数。