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发明公开
CN103852676A 无源触点检测装置及方法 无效 - 驳回

无源触点检测装置及方法
摘要：
本发明提出一种用于无源触点的检测装置，包括：一隔离变压器（210，310）；一无源触点（S1），其串联在所述隔离变压器（210，310）副边的回路中；一驱动电路（220，320），其连接在所述隔离变压器（220，320）原边的回路中，用于向所述隔离变压器（210，310）提供交替变化的直流电流；一检测电路（230,330），耦合在所述隔离变压器（210，310）原边，用于响应于所述隔离变压器（210，310）原边的等效阻抗变化，输出用于指示所述无源触点（S1）是导通状态，还是关断状态的电平。
摘要（英）：

The invention provides a passive contact detection device. The passive contact detection device includes an isolation transformer (210, 310), a passive contact (S1) which is connected in series in a loop of the secondary side of the isolation transformer (210, 310), a driving circuit (220, 320) which is connected in a loop of the primary side of the isolation transformer (210, 310) and is used for providing alternately-varied direct current for the isolation transformer (210, 310), a detection circuit (230,330) which is coupled to the primary side of the isolation transformers (210, 310) and is used for responding to equivalent impedance changes of the primary side of the isolation transformer (210, 310) and outputting electrical levels used for indicating a power-on state and a power-off state of the passive contact (S1).

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