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    • 7. 发明授权
    • Digital protective circuit breaker
    • 数字保护断路器
    • US5113304A
    • 1992-05-12
    • US500361
    • 1990-03-28
    • Masashi OzakiKatsuhiro Furukawa
    • Masashi OzakiKatsuhiro Furukawa
    • H02H3/093
    • H02H3/0935
    • A circuit breaker includes a current detector for generator analog voltage signals in accordance with load current of respective phases and a control circuit for executing a tripping operation in response to the analog voltage signals. The control circuit includes an analog switch repeating a time division selecting operation that one of the analog phase voltage signals generated by the current detector is selectively allowed to pass through the same in a predetermined order, an analog-to-digital (A/D) converter for converting the analog voltage signal having passed through the analog switch to a corresponding digital signal, and a microcomputer receiving the digital voltage signal from the A/D converter and obtaining the effective load current value based on the digital voltage signals. The microcomputer generates a tripping order when the effective load current value exceeds a predetermined value. The control circuit may include an amplifier for amplifying low level analog voltage signals and supplying the amplified signals to the A/D converter.
    • 断路器包括根据各相的负载电流产生模拟电压信号的电流检测器和用于响应于模拟电压信号执行跳闸操作的控制电路。 该控制电路包括:重复时分选择操作的模拟开关,其中由电流检测器产生的模拟相电压信号之一被选择性地允许以预定顺序通过该模拟开关,模数(A / D) 转换器,用于将通过模拟开关的模拟电压信号转换成相应的数字信号;以及微型计算机,接收来自A / D转换器的数字电压信号,并基于数字电压信号获得有效负载电流值。 当有效负载电流值超过预定值时,微计算机产生跳闸命令。 控制电路可以包括用于放大低电平模拟电压信号并将放大的信号提供给A / D转换器的放大器。