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    • 6. 发明授权
    • VERFAHREN UND SCHALTUNGSANORDNUNG ZUM MESSEN EINER KAPAZITÄT
    • 方法与电路测量能力
    • EP2013631B1
    • 2011-10-19
    • EP07728120.2
    • 2007-04-13
    • Huf Hülsbeck & Fürst GmbH & Co. KG
    • WEBER, Franz-JosefWITTE, Martin
    • G01R27/26
    • G01R27/2605G01D5/24
    • According to the invention, a capacitance can be measured by supplying the voltage across the capacitance to an analytical circuit. The analytical circuit is designed to be able to record input voltages to a given precision whilst the same are within a measuring range. The capacitance is firstly charged to a starting voltage several factors above an upper limit for the measuring range, then discharged through a given resistance for a given time, the voltage then reaching a final voltage value dependent on the capacitance. The resistance and time are chosen such that the final voltage value lies within the measuring range. The final voltage value is then recorded and the capacitance determined from the final voltage value. A circuit arrangement for recording the capacitance of a capacitor is provided with a capacitor (2) connector connected to an input (4) of the analytical circuit and the other connector is connected to a reference potential (3). A first switch device can connect the input to a constant voltage. A second switch deice can connect a resistance (18) of a given value between the input and the reference potential. A controller (6) controls both switch devices such that the input is connected to the constant voltage, the analytical circuit providing an output value which can adopt an extreme value when the input is at the constant voltage, the resistance is then connected for a given time between the input and the reference potential, such that the voltage between the input and the reference potential falls to a final value within the measuring range and the input is then disconnected from the nd reference potential and the constant voltage such that the voltage is held at the final value, the analytical circuit generating an output value proportional to the final value. The output of the analytical circuit is coupled to a device for storing the output value and for determining a corresponding capacitance value.