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1.发明公开
公开(公告)号：EP0155074A3
公开(公告)日：1987-04-22
申请号：EP85300533
申请日：1985-01-25
IPC分类号： H04M19/00
CPC分类号： H04M19/005
摘要： Atypical active impedance line feed circuit includes tip and ring amplifiers (20, 40) being controlled to exhibit a.c. impedance and a.c. resistance characteristics for the purpose of supplying energizing current via tip and ring terminals (2, 3) for tip and ring leads of a two wire communication line. Protection from excessive heat generation in an instant of a ground fault on the communication line is provided by a d.c. amplifier (210) having an input resistively connected to the tip and ring leads and an output connected via a resistive unidirectional signal path (214) to an input of the ring amplifier. A ground fault occurrence causes the resistive unidirectional signal path to become conductive and reduces the current flow in the ring lead by causing the output voltage of the ring amplifier to vary in the direction of ground potential. The output of the d.c. amplifier is also useful for improving circuit tolerance of longitudinal interference.
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2.发明公开Active impedance line feed circuit with improved ground fault protection 失效Leitungsspeiseschaltung mit aktiver Impedanz und mit Erdschlussfehlerschutz。
公开(公告)号：EP0155074A2
公开(公告)日：1985-09-18
申请号：EP85300533.8
申请日：1985-01-25
IPC分类号： H04M19/00
CPC分类号： H04M19/005
摘要： Atypical active impedance line feed circuit includes tip and ring amplifiers (20, 40) being controlled to exhibit a.c. impedance and a.c. resistance characteristics for the purpose of supplying energizing current via tip and ring terminals (2, 3) for tip and ring leads of a two wire communication line. Protection from excessive heat generation in an instant of a ground fault on the communication line is provided by a d.c. amplifier (210) having an input resistively connected to the tip and ring leads and an output connected via a resistive unidirectional signal path (214) to an input of the ring amplifier. A ground fault occurrence causes the resistive unidirectional signal path to become conductive and reduces the current flow in the ring lead by causing the output voltage of the ring amplifier to vary in the direction of ground potential. The output of the d.c. amplifier is also useful for improving circuit tolerance of longitudinal interference.
摘要翻译： 典型的有源阻抗线路馈电电路包括被控制成具有直流电流的尖端和环形放大器（20,40）。 阻抗和电流 电阻特性，用于通过用于双线通信线路的尖端和环形引线的尖端和环形端子（2,3）来提供通电电流。 通信线路接地故障瞬间的过热发生保护是由直流电源提供的。 放大器（210）具有电阻连接到尖端和环形引线的输入端，以及经由电阻性单向信号路径（214）连接到环形放大器的输入端的输出端。 接地故障发生导致电阻式单向信号路径变得导通，并且通过使环形放大器的输出电压在接地电位方向上变化来减小环形引线中的电流。 d.c.的输出。 放大器也可用于提高纵向干扰的电路容差。
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公开(公告)号：EP0272800A3
公开(公告)日：1990-03-28
申请号：EP87310286.7
申请日：1987-11-20
IPC分类号： H04M19/00
CPC分类号： H04M19/005
摘要： A typical active impedance line feed circuit includes tip and ring amplifiers (20, 40) being controlled in response to signals at tip and ring voltage taps (6, 7) by a control circuit (60) to exhibit a.c. impedance and d.c. resistance characteristics for the purpose of supplying energizing current via tip and ring terminals (2, 3) for tip and ring leads of two wire communication line. In one example of the active impedance line feed circuit, improved operational tolerance of longitudinal interference and of a ground fault condition is provided by a d.c. amplifier (210a) being responsive to voltages at the tip and ring terminals. The circuit is characterized in that an inverting input of the d.c. amplifier is connected via resistors (212a, 313a) to the tip and ring voltage taps. In operation, the d.c. amplifier provides complete cancellation of all common mode signals at the tip and ring voltage taps. A compensation amplifier (235) is also connected between the tip and ring voltage taps and is responsive to the output of a control amplifier (231) for compensating for non-symmetrical current, the non-symmetrical current being introduced between the tip and the ring voltage taps by normal operation of the control circuit. Thereby, a threshold of ground fault current limiting action is substantially constant under all operating conditions. The d.c. amplifier is conveniently manufacturable in integrated circuit technology along with the remaining amplifiers in the active impedance line feed circuit.
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公开(公告)号：EP0272800A2
公开(公告)日：1988-06-29
申请号：EP87310286.7
申请日：1987-11-20
IPC分类号： H04M19/00
CPC分类号： H04M19/005
摘要： A typical active impedance line feed circuit includes tip and ring amplifiers (20, 40) being controlled in response to signals at tip and ring voltage taps (6, 7) by a control circuit (60) to exhibit a.c. impedance and d.c. resistance characteristics for the purpose of supplying energizing current via tip and ring terminals (2, 3) for tip and ring leads of two wire communication line. In one example of the active impedance line feed circuit, improved operational tolerance of longitudinal interference and of a ground fault condition is provided by a d.c. amplifier (210a) being responsive to voltages at the tip and ring terminals. The circuit is characterized in that an inverting input of the d.c. amplifier is connected via resistors (212a, 313a) to the tip and ring voltage taps. In operation, the d.c. amplifier provides complete cancellation of all common mode signals at the tip and ring voltage taps. A compensation amplifier (235) is also connected between the tip and ring voltage taps and is responsive to the output of a control amplifier (231) for compensating for non-symmetrical current, the non-symmetrical current being introduced between the tip and the ring voltage taps by normal operation of the control circuit. Thereby, a threshold of ground fault current limiting action is substantially constant under all operating conditions. The d.c. amplifier is conveniently manufacturable in integrated circuit technology along with the remaining amplifiers in the active impedance line feed circuit.
摘要翻译： 典型的有源阻抗线路馈电电路包括尖端和环形放大器（20,40），其通过控制电路（60）响应于尖端和环形电压抽头（6,7）处的信号而被控制，以呈现直流。 阻抗和直流 电阻特性，用于通过用于两线通信线路的尖端和环形引线的尖端和环形端子（2,3）来提供通电电流。 在有源阻抗线路馈电电路的一个例子中，纵向干扰和接地故障状态的改进的操作公差由直流电源提供。 放大器（210a）响应于尖端和环形端子处的电压。 该电路的特征在于，直流的反相输入。 放大器通过电阻（212a，313a）连接到尖端和环形电压抽头。 在运行中 放大器完全取消了尖端和环形电压抽头处的所有共模信号。 补偿放大器（235）也连接在尖端和环形电压抽头之间，并且响应于控制放大器（231）的输出以补偿非对称电流，非对称电流被引入尖端和环之间 通过控制电路的正常工作进行电压抽头。 因此，在所有操作条件下，接地故障电流限制动作的阈值基本上是恒定的。 直径 放大器与集成电路技术中的剩余放大器一起可以方便地制造，并且在有源阻抗馈线电路中可以使用。
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公开(公告)号：EP0272800B1
公开(公告)日：1992-12-30
申请号：EP87310286.7
申请日：1987-11-20
IPC分类号： H04M19/00
CPC分类号： H04M19/005
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6.发明授权
公开(公告)号：EP0155074B1
公开(公告)日：1990-07-11
申请号：EP85300533.8
申请日：1985-01-25
IPC分类号： H04M19/00
CPC分类号： H04M19/005
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