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Telephone line seizure detection device using two optocouplers connected in series to telephone line and including negative feedback circuit to decreases influence of their transfer coefficients
Telephone line seizure detection device using two optocouplers connected in series to telephone line and including negative feedback circuit to decreases influence of their transfer coefficients
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机译:使用两个光电耦合器串联到电话线上并包括负反馈电路以减小其传输系数的影响的电话线咬合检测装置
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摘要
The device measures the voltage (UL) of the telephone line across two optocouplers (OC1, OC2) connected in series to the telephone line. The first optocoupler discharges a capacitor (C) connected to the telephone line, the second optocoupler converts the discharge current (ID) into an image current (ID') in a measurement circuit (S). A negative feedback circuit is included between the two optocouplers. An Independent claim is included for an apparatus.
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