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    SCHALTUNGSANORDNUNG UND VERFAHREN ZUR FERNSPEISUNG
    2.
    发明公开
    SCHALTUNGSANORDNUNG UND VERFAHREN ZUR FERNSPEISUNG 审中-公开
    电路及方法远程供电

    公开(公告)号：EP1142294A1

    公开(公告)日：2001-10-10

    申请号：EP99960705.4

    申请日：1999-12-21

    申请人： Ericsson Ahead Communications Systems GmbH

    发明人： KOVARIK, Peter ,  STADLBAUER, Günther ,  HASELSTEINER, Franz

    IPC分类号： H04M19/00

    CPC分类号： H04M19/008

    摘要： The invention relates to a circuit configuration for remote feeding of a local component (21) which is connected to the exchange component (20) of an out-of-area switching device of a message transmission system via a transmission line (1, 2). Said device comprises a d.c. converter (14, 15) which preferably comprises a transducer-transformer (14). Said d.c. converter (14, 15) converts the voltage of a remote feeding voltage source which can be connected to a transmission line in the exchange component. Subscriber terminals which are connected to the local component (21) are thereby fed. A monitoring device (23) is provided in the local component (21). The current electrical power requirement of the local component (21) and the subscriber terminals connected thereto can be determined by said monitoring device (23). The remote feeding voltage source can be controlled by means of a transmission device which is connected to the transmission line (1, 2) by means of the monitoring device (23) on the basis of the electrical power requirement thus determined.

    POWER SUPPLY FOR TELECOMMUNICATIONS DEVICES
    3.
    发明公开
    POWER SUPPLY FOR TELECOMMUNICATIONS DEVICES 失效
    电源的电信设备

    公开(公告)号：EP0872118A1

    公开(公告)日：1998-10-21

    申请号：EP96925893.0

    申请日：1996-07-31

    申请人： Nokia Telecommunications Oy

    IPC分类号： H04M19

    CPC分类号： H04M19/001 ,  H04M19/008

    摘要： A power supply has a plurality of single line interface circuits (20, 22, 24 and 26) each connected by a respective line, to a respective telephone (4, 6, 8 and 10) or other telecommunications device. Each SLIC applies a sufficient voltage derived from a battery to the line to operate the respective telephone, and dissipates any excess power supplied by the battery. The apparatus includes common power regulation means (30), which incorporates a switch mode power supply unit (68), and which monitors the voltages being applied by the SLICs at any one time and reduces the voltage applied to the SLICs to substantially the maximum voltage required by any one of the SLICs, thereby reducing the amount of power dissipated by the SLICs.

    A subscriber line interface circuit providing regulated current
    6.
    发明公开
    A subscriber line interface circuit providing regulated current 失效
    SchnittstellenschaltungfürTeilnehmerleitung，die regulierten Strom liefert。

    公开(公告)号：EP0450884A2

    公开(公告)日：1991-10-09

    申请号：EP91302800.7

    申请日：1991-03-28

    申请人： SEISCOR TECHNOLOGIES, INC.

    发明人： Carter, Dan K. ,  Wortman, Donald W.

    IPC分类号： H04M19/00

    CPC分类号： H04M19/003 ,  H04M19/008

    摘要： A subscriber line interface circuit (32) provides regulated current to a telephone subscriber (14) in an improved manner by reducing the amount of power required to operate while maintaining a constant current source. The current to the telephone subscriber (14) flows through a switching transistor (92, Fig. 3), and inductive storage element (98, Fig. 3), sensing resistors (54, 56) and a hybrid transformer (38). The desired operating characteristic is obtained by cycling the switching transistor (92). The switching transistor (92) is cycled on at a preset interval causing the telephone subscriber current to flow from the switching transistor. The switching transistor is cycled off in response to an increase in the telephone subscriber current as sensed by the sensing resistors (54, 56) thereby causing the current to flow from the inductive storage element (38). A current sensor (60) coupled to the sensing resistors (54, 56) supplies a current level signal SUMSIG to the switch-mode current source (52) that includes the transistor (92)2 and the inductive storage element (38). Saturation of the transformer (38) is prevented by regulated opposing current supplied by a source (80) controlled by the SUMSIG signal.

    摘要翻译： 用户线接口电路（32）通过在维持恒定电流源的同时减少操作所需的功率量，以改进的方式向电话用户（14）提供调节电流。 到电话用户（14）的电流流过开关晶体管（图3中的92）和感应存储元件（98，图3），感测电阻器（54,56）和混合变压器（38）。 通过使开关晶体管（92）循环来获得期望的工作特性。 开关晶体管（92）以预设间隔循环，导致电话用户电流从开关晶体管流出。 响应于由感测电阻（54,56）感测到的电话用户电流的增加，开关晶体管被循环，从而使电流从感应存储元件（38）流出。 耦合到感测电阻器（54,56）的电流传感器（60）向包括晶体管（92）2和感应存储元件（38）的开关模式电流源（52）提供电流电平信号SUMSIG。 通过由SUMSIG信号控制的源极（80）提供的调节相对电流来防止变压器（38）的饱和。

    DC-supply arrangement for a telecommunication line
    9.
    发明公开
    DC-supply arrangement for a telecommunication line 失效
    Gleichstromspeisungsanordnungfüreine Fernmeldeleitung。

    公开(公告)号：EP0252557A1

    公开(公告)日：1988-01-13

    申请号：EP87201223.2

    申请日：1987-06-25

    申请人： Philips Electronics N.V.

    发明人： Schoofs, Franciscus A. C. M.

    IPC分类号： H04M19/00

    CPC分类号： H04M19/008 ,  H02M3/158

    摘要： To reduce dissipation SMPS converters 2 and 4 are used. Step down converter 2 converts the voltage of supply source 6 down to a lower direct voltage across output capacitor 14, under the control of a periodic pulse-like control signal 22 with variable duty cycle. Due to the common mode currents on the telecommunication line the voltage across output capacitor 14 can rise to a higher value than the desired output voltage if the charge supplied by the common mode current exceeds the charge discharged by the load. This output voltage can now no longer be decreased by reducing the duty cycle of the control signal. To be able to discharge this excess charge free of dissipation a step-up con­verter 4 is provided returning this excess charge to the supply source 6.

    摘要翻译： 为了减少耗散使用SMPS转换器2和4。 降压转换器2在具有可变占空比的周期性脉冲状控制信号22的控制下，将电源6的电压降低到输出电容器14两端的较低直流电压。 由于通信线路上的共模电流，如果由共模电流提供的电荷超过负载放电的电荷，则输出电容器14两端的电压可以上升到比期望的输出电压更高的值。 现在可以通过减少控制信号的占空比来减小该输出电压。 为了能够释放这种不耗散的过量电荷，提供了一个升压转换器4，该过剩电荷返回到电源6。