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    • 7. 发明授权
    • Isolation circuitry
    • 隔离电路
    • US5801913A
    • 1998-09-01
    • US641030
    • 1996-04-29
    • Arkady Pittel
    • Arkady Pittel
    • G08B26/00H02H3/00
    • G08B26/005Y10T307/766
    • Isolation circuitry for automatically disconnecting a load from a source upon detecting a short and for automatically reconnecting the load to the source after the short circuit clears. The isolation circuitry includes a first node connected to a second node via a first transmission path, and a third node connected to a fourth node via a second transmission path maintained at a different voltage than the first transmission path. There is a switch between the nodes on the first transmission path, and a sensing circuit that is connected between the first and second transmission paths. The sensing circuit includes a current generator that induces a fault indicating current into a load between the first and second transmission paths and monitors the fault indicating current for an increase over a threshold defined by an operating voltage setting circuit when the load impedance falls below a lower limit indicating a short circuit. The sensing circuit provides a control signal to open the switch if a short circuit is detected and to close the switch if a short circuit is not detected.
    • 隔离电路,用于在检测到短路后自动断开负载与电源的连接,并在短路清除后自动将负载重新连接到电源。 隔离电路包括经由第一传输路径连接到第二节点的第一节点和经由维持在与第一传输路径不同的电压的第二传输路径连接到第四节点的第三节点。 在第一传输路径上的节点之间存在切换,以及连接在第一和第二传输路径之间的感测电路。 感测电路包括电流发生器,其引起指示电流进入第一和第二传输路径之间的负载的故障,并且当负载阻抗降至低于下限时,监视故障指示电流以增加由操作电压设置电路定义的阈值 极限表示短路。 如果检测到短路,感测电路提供控制信号以打开开关,并且如果没有检测到短路,则关闭开关。