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1. 发明申请

WO1994017619A1 METHOD OF PROVIDING D.C. FEED TO A TELEPHONE LINE 审中-公开
标题翻译：提供直流电话线路的方法
公开(公告)号：WO1994017619A1
公开(公告)日：1994-08-04
申请号：PCT/CA1993000283
申请日：1993-06-30
申请人： NORTHERN TELECOM LIMITED
发明人： NORTHERN TELECOM LIMITED , GORES, Stanley, Adam , DARVEAU, Joseph, Francois, Michel , TREMBLAY, Francois, Yvon , ROSENBAUM, Stanley, Daniel , ROSCH, Reinhard, Werner
IPC分类号： H04M19/02
CPC分类号： H04M19/023
摘要： A two-wire telephone line is supplied with d.c. feed from a drive circuit (10) including two amplifiers (32) via which a transmission signal (Rx) is supplied to the line. Output potentials (TV, RV) of the two amplifiers determine a loop current (IL) on the line, which is monitored and used to control a supply voltage (CV) for the drive circuit, the amplifier output potentials being offset from the supply potentials by headroom voltages (TH, RH) to accommodate the transmission signal. The resulting current limiting voltage control acts iteratively to converge the supply voltage and a target voltage (TG) which is inversely dependent on an amount by which the loop current exceeds a predetermined value, the rate of convergence being fast for high loop currents for rapid response and slow for small differences to provide stable operation. The headroom voltages can be increased to nearly the supply voltage to reverse the polarity of the d.c. feed while maintaining current limiting.
摘要翻译：一根双线电话线与d.c. 从包括两个放大器（32）的驱动电路（10）馈送，通过该放大器将发送信号（Rx）提供给该线路。两个放大器的输出电位（TV，RV）决定了线路上的回路电流（IL），该电流被监视并用于控制驱动电路的电源电压（CV），放大器输出电位与电源电位相抵消通过净空电压（TH，RH）来适应传输信号。所得到的限流电压控制迭代地使电源电压和目标电压（TG）收敛，该目标电压（TG）与环路电流超过预定值的量成反比，对于快速响应的高回路电流，收敛速度快并且缓慢的小差异提供稳定的操作。净空电压可以提高到几乎电源电压，以反转直流电的极性。饲料，同时保持电流限制。

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