Wide frequency multi-phase undervoltage detection circuit
    1.
    发明授权
    Wide frequency multi-phase undervoltage detection circuit 失效
    宽频多相欠压检测电路

    公开(公告)号:US4507713A

    公开(公告)日:1985-03-26

    申请号:US540593

    申请日:1983-10-11

    申请人: Samuel C. Hsieh

    发明人: Samuel C. Hsieh

    IPC分类号: H02H3/24

    CPC分类号: H02H3/24

    摘要: A multi-phase undervoltage detection circuit is disclosed wherein a multi-phase input voltage is compared to a reference. If the peak level of the input voltage is above the reference, a capacitor is discharged. If the voltage of any one of the phases is below the reference, the capacitor charges above the level of the input to a flip-flop. At the same time the voltage of another of the phases clocks the flip-flop. Since the input of the flip-flop is "high" when it is clocked, it changes states and its output goes "low" which provides a circuit output indicative of an undervoltage condition. If no undervoltage condition exists, the flip-flop will not change states and the circuit output is indicative of a non-undervoltage condition.

    摘要翻译: 公开了一种多相欠压检测电路,其中将多相输入电压与参考值进行比较。 如果输入电压的峰值电平高于参考电压,则放电一个电容。 如果任一相的电压低于参考电压,则电容器的电荷高于触发器的输入电平。 同时另一相的电压对触发器进行时钟。 由于当触发器的时钟输入为“高”时,它改变状态并且其输出变为“低”,这提供指示欠电压状态的电路输出。 如果没有欠压条件,触发器不会改变状态,电路输出表示非欠压状态。

    Apparatus for detecting DC content of an AC waveform
    3.
    发明授权
    Apparatus for detecting DC content of an AC waveform 失效
    用于检测AC波形的DC内容的装置

    公开(公告)号:US5459417A

    公开(公告)日:1995-10-17

    申请号:US83413

    申请日:1993-06-28

    IPC分类号: G01R19/00 H03K5/153 H03K5/00

    CPC分类号: G01R19/003

    摘要: A circuit for monitoring the DC content of an AC waveform includes a differential amplifier having one input connected to the AC waveform and the other input connected to a capacitive-coupled network that eliminates any DC component in the AC waveform at the frequency being monitored. Additional circuitry is required to cancel any phase shift and reactance of the coupling capacitor. The output of the differential amplifier is a signal which represents the amplitude and polarity of the DC content.

    摘要翻译: 用于监视AC波形的直流含量的电路包括一个差分放大器,其一个输入连接到AC波形,另一个输入连接到电容耦合网络,消除了处于被监视频率的AC波形中的任何DC分量。 需要额外的电路来消除耦合电容器的任何相移和电抗。 差分放大器的输出是表示DC内容的幅度和极性的信号。