Capacitance measurement apparatus

    公开(公告)号:US12092671B2

    公开(公告)日:2024-09-17

    申请号:US17794044

    申请日:2020-12-17

    发明人: Chen Chen

    IPC分类号: G01D5/24 G01R27/26

    CPC分类号: G01R27/2605 G01D5/24

    摘要: Provided is a capacitance measurement apparatus (200), including: a channel capacitor (101) configured to generate different capacitance values according to a sensing signal; a measurement circuit (220) connected to the channel capacitor (101) and configured to access a pulse signal and measure a capacitance value of the channel capacitor (101); and an adjustment circuit (210) connected between the channel capacitor (101) and the measurement circuit (220), and configured to cancel a basic capacitance value of the channel capacitor (101) and generate a varying capacitance value of the channel capacitor (101). The measurement circuit (220) is further configured to convert the varying capacitance value of the channel capacitor (101) into an output signal. A reference capacitance of the channel capacitor (101) is canceled by means of the adjustment circuit (210), thereby increasing the valid range of an output signal of the measurement circuit (220).

    CAPACITANCE MEASUREMENT APPARATUS

    公开(公告)号:US20230065600A1

    公开(公告)日:2023-03-02

    申请号:US17794044

    申请日:2020-12-17

    发明人: Chen Chen

    IPC分类号: G01R27/26 G01D5/24

    摘要: Provided is a capacitance measurement apparatus (200), including: a channel capacitor (101) configured to generate different capacitance values according to a sensing signal; a measurement circuit (220) connected to the channel capacitor (101) and configured to access a pulse signal and measure a capacitance value of the channel capacitor (101); and an adjustment circuit (210) connected between the channel capacitor (101) and the measurement circuit (220), and configured to cancel a basic capacitance value of the channel capacitor (101) and generate a varying capacitance value of the channel capacitor (101). The measurement circuit (220) is further configured to convert the varying capacitance value of the channel capacitor (101) into an output signal. A reference capacitance of the channel capacitor (101) is canceled by means of the adjustment circuit (210), thereby increasing the valid range of an output signal of the measurement circuit (220).