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1. 发明申请

WO1990007835A1 A TELEPHONE SUBSET ARRANGEMENT 审中-公开
标题翻译：电话座位安排
公开(公告)号：WO1990007835A1
公开(公告)日：1990-07-12
申请号：PCT/AU1989000493
申请日：1989-11-17
申请人： STANDARD TELEPHONES AND CABLES PTY. LIMITED , FOX, Ronald, Christopher, Shaw
发明人： STANDARD TELEPHONES AND CABLES PTY. LIMITED
IPC分类号： H04M19/08
CPC分类号： H04M19/08 , H04M1/312
摘要： A telephone circuit subset arrangement in which the base/emitter junction of a switching transistor (TR1) coupling an internal battery (B1) to the dialler chip's power terminals (VDD, VSS) is shunted by hook-switch signal contacts (HS) when the subset is brought into the off-hook mode, thereby turning the switching transistor off and disconnecting the battery. The circuit is so arranged that upon the switching transistor turning off, three auxiliary switching transistors (TR3, TR4 and TR5) turn on and operate the subset's line switch to connect line current to the dialler chip's power terminals. A network of resistors (R1, R2 and R3) associated with the switching transistor (TR1) ensure that on the one hand sufficient current is available to turn on the auxiliary switching transistors, and on the other hand limit the current to a magnitude which does not cause excessive battery discharge while the subset is off-hook.
摘要翻译：一种电话电路子集装置，其中当将内部电池（B1）耦合到拨号器芯片的电源端子（VDD，VSS）的开关晶体管（TR1）的基极/发射极结被钩开关信号触点（HS）分流时子集进入摘机模式，从而关断开关晶体管并断开电池。电路布置成使得在开关晶体管截止时，三个辅助开关晶体管（TR3，TR4和TR5）导通并操作子集的线路开关，以将线路电流连接到拨号器芯片的电源端子。与开关晶体管（TR1）相关联的电阻器（R1，R2和R3）网络确保一方面有足够的电流可用于接通辅助开关晶体管，另一方面将电流限制为子集是摘机时不会导致电池放电过度。

2. 发明申请

WO1990007213A1 A PROTECTION CIRCUIT 审中-公开
标题翻译：保护电路
公开(公告)号：WO1990007213A1
公开(公告)日：1990-06-28
申请号：PCT/AU1989000491
申请日：1989-11-17
申请人： STANDARD TELEPHONES AND CABLES PTY. LIMITED , ALCATEL N.V. , FOX, Ronald, Christopher, Shaw
发明人： STANDARD TELEPHONES AND CABLES PTY. LIMITED , ALCATEL N.V.
IPC分类号： H02H03/22
CPC分类号： H02H9/04 , H02H9/02 , H04M1/745 , H04M3/18
摘要： A protection circuit for protecting circuit elements (TX) connected to line via terminal means (L1 and L2) from the effects of a transient abnormal high voltage surge, comprising a semiconductor switch (TR1, TR2), a first circuit comprising a resistor (R1) in series with the conductor path of the semiconductor switch and a voltage reference means (D1, D2) in parallel with the resistor and a junction of the semiconductor, and a second circuit comprising the first voltage reference means in series with a second voltage reference means (D3), the second circuit being connected in parallel with the resistor. The second circuit further includes a voltage dependent resistance (VC1). When the current through the resistor exceeds normal line current the voltage reference means (D1, D2, D3) clamp the voltage drop across the resistor and turn off the semiconductor switch.
摘要翻译：一种用于保护电路元件（TX）的保护电路，其特征在于包括半导体开关（TR1，TR2）的瞬态异常高电压浪涌的影响，经由端子装置（L1和L2）连接到线路元件（TX），包括电阻器）与所述半导体开关的导体路径串联的电压参考装置（D1，D2）和与所述半导体的结合并联的电压参考装置（D1，D2），以及包括与所述第一参考装置串联的第二电压参考装置的第二电路装置（D3），第二电路与电阻器并联连接。第二电路还包括电压依赖电阻（VC1）。当通过电阻器的电流超过法线电压时，电压参考装置（D1，D2，D3）钳位电阻两端的电压降并关闭半导体开关。

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