公开(公告)号：US4767980A

公开(公告)日：1988-08-30

申请号：US111215

申请日：1987-10-22

申请人： William I. H. Chen ,  Philip Dillon ,  Glenn Yancey

发明人： William I. H. Chen ,  Philip Dillon ,  Glenn Yancey

IPC分类号： H01F27/42 ,  H04M7/00 ,  H04M19/00

CPC分类号： H01F27/42 ,  H04M19/005 ,  H04M7/0096

摘要： A circuit for increasing the apparent inductance presented by a transformer to a differential signal. The circuit may be used in a battery feed interface circuit for providing battery power to a subscriber's telephone or in a current sink interface circuit for providing a low impedance DC loop closure toward a telephone line feed circuit while maintaining a high impedance for differential AC signals. In either usage the inductance multiplier circuit always multiplies the primary inductance of the transformer by a factor which is one plus a positive number. The transformer has three windings. The multiplication is accomplished by a current source which provides to the third winding a current which flows therein in a manner so as to oppose the current flowing in that winding due to the voltage induced in that winding when the first and second windings are excited by the differential AC signal.

摘要翻译： 用于将变压器提供的视在电感增加到差分信号的电路。 该电路可用于电池馈电接口电路中，用于向用户的电话或当前的接收器接口电路提供电池电力，以向电话线馈电电路提供低阻抗DC环路闭合，同时保持差分AC信号的高阻抗。 在任何一种使用中，电感乘法器电路总是将变压器的初级电感乘以一加正数。 变压器有三个绕组。 乘法由电流源实现，该电流源以第一和第二绕组被第一绕组和第二绕组激励的方式向第三绕组提供电流，该电流以与该绕组中流动的电流相反的方式流动， 差分交流信号。

公开(公告)号：US06396673B1

公开(公告)日：2002-05-28

申请号：US09415362

申请日：1999-10-08

申请人： Glenn Yancey ,  Mark Szewczul

发明人： Glenn Yancey ,  Mark Szewczul

IPC分类号： H01H308

CPC分类号： H04L25/08

摘要： A communications system including an over-voltage and over-current surge protection circuit is provided that passes high frequency signals between transmitting and receiving devices with low attenuation. The protection circuit includes a current limiter and over-voltage protection device. The over-voltage protection device includes a diode device comprising a set of anti-parallel diodes, which is connected in series with a shunt device. The over-voltage protection device is coupled between a signal transmission line and ground. The current limiter is coupled between the transmitting and receiving devices.

摘要翻译： 提供一种包括过电压和过电流浪涌保护电路的通信系统，其在低衰减的发送和接收设备之间通过高频信号。 保护电路包括限流器和过电压保护装置。 过电压保护装置包括二极管装置，其包括与分流装置串联连接的一组反并联二极管。 过电压保护装置耦合在信号传输线和地之间。 电流限制器耦合在发送和接收设备之间。