公开(公告)号：EP0450884A3

公开(公告)日：1991-12-18

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。

公开(公告)号：EP0450884B1

公开(公告)日：1996-06-12

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。

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。