不推薦使用低電壓操作數的返回來作為差動元件的閉鎖輸入。差動元件包括飽和檢測器，飽和檢測器對差動電流和制動電流之間一定的時間關系做出反應，因此，為了合適地運行它必須時總是處于運行狀態(tài)。這個元件可以用來給出–個需要的時間延時動作特性,

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