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    • 3. 发明申请
    • MODULE AND CAPACITANCE DETECTING METHOD
    • 模块和电容检测方法
    • WO2013177760A1
    • 2013-12-05
    • PCT/CN2012/076262
    • 2012-05-30
    • MURATA MANUFACTURING CO., LTD.NAGUMO, ShojiNAKAZATO, MasashiDAI, YujieZHANG, XiaoxingLU, Yingjie
    • NAGUMO, ShojiNAKAZATO, MasashiDAI, YujieZHANG, XiaoxingLU, Yingjie
    • G01R27/26
    • G01R27/2605H03K17/955H03K2217/960745
    • A module (5) includes a capacitance detecting circuit (10). The capacitance detecting circuit (10) includes a constant current source (20) supplying a constant current to a voltage detection point (P), a time measuring unit (28) measuring time of charge until the voltage of the voltage detection point (P) attains to a prescribed voltage, a storage unit (30) and an operation unit (32). The storage unit (30) stores a first data obtained in advance as the time of charge of a capacitance element having a known capacitance value, and a second data obtained in advance as the time of charge of a capacitance component (Cp). The operation unit (32) generates a third data representing the time of charge of an object of detection (Cs) from a difference between the first measurement value of the time measuring unit (28) when the capacitance component (Cp) is connected to the voltage detection point (P) and the second data, and based on the ratio between the third data and the first data and on the known capacitance value, calculates the capacitance value of the object of detection (Cs).
    • 模块(5)包括电容检测电路(10)。 电容检测电路(10)包括向电压检测点(P)提供恒定电流的恒流源(20),测量充电时间直到电压检测点(P)的电压的时间测量单元(28) 达到规定电压,存储单元(30)和操作单元(32)。 存储单元(30)将预先获得的第一数据存储为具有已知电容值的电容元件的充电时间和预先获得的作为电容分量(Cp)的充电时间的第二数据。 操作单元(32)当电容分量(Cp)连接到时间测量单元(28)的第一测量值与第二测量单元(28)的第一测量值之间的差时,产生表示检测对象(Cs)的充电时间的第三数据 电压检测点(P)和第二数据,并且基于第三数据与第一数据之间的比率和已知电容值,计算检测对象(Cs)的电容值。