公开(公告)号：US4727571A

公开(公告)日：1988-02-23

申请号：US921562

申请日：1986-10-21

Applicant: Alfred Brandstetter ,  Juergen Riesmeyer

Inventor： Alfred Brandstetter ,  Juergen Riesmeyer

IPC: H04M1/31 ,  H04M1/74 ,  H04M1/00

CPC classification number: H04M1/312 ,  H04M1/745

Abstract: A circuit for surge voltage protection of therefor a telephone station has first and second input terminals for receiving a DC supply voltage via a two-wire subscriber line. Both terminals are shunted via a varistor. In parallel with the varistor is an element for protecting the circuit against polarity reversals. This element has two outputs, one of them carries the positive potential of the DC supply voltage and both of them are connected with respective terminals of the actual station circuit. A V-MOS or bipolar tranistor is arranged between the one output and the associated station circuit terminal. This transistor belongs to a current limiting circuit and serves also as a dialswitch-pulsing contact. The transistor circuit contains two further transistors and a number of dimensioning resistors. The positive output of the protection element is connected to the keyboard-sided input of the transistor circuit via a series network formed by a reverse Zener-diode and a resistor. The breakdown voltage of the this network is below the voltage at which the varistor becomes operative.

Abstract translation: 用于电话站的用于浪涌电压保护的电路具有用于经由两线用户线路接收DC电源电压的第一和第二输入端子。 两个端子通过压敏电阻分流。 与压敏电阻并联是用于保护电路免受极性反转的元件。 该元件具有两个输出，其中一个输出直流电源电压的正电位，它们都与实际电路电路的各个端子连接。 在一个输出和相关的站电路终端之间设置一个V-MOS或双极晶体管。 该晶体管属于限流电路，也可用作拨号开关脉冲触点。 晶体管电路包含两个另外的晶体管和多个尺寸尺寸的电阻器。 保护元件的正极输出通过由反向齐纳二极管和电阻器形成的串联网络连接到晶体管电路的键盘侧输入端。 该网络的击穿电压低于压敏电阻工作的电压。

公开(公告)号：US4809322A

公开(公告)日：1989-02-28

申请号：US161728

申请日：1988-02-29

Applicant: Juergen Riesmeyer

Inventor： Juergen Riesmeyer

IPC: H04M1/53 ,  H04M1/00

CPC classification number: H04M1/53

Abstract: The invention relates to a circuit arrangement for a telephone station with ground connection to a central supply device for the purpose of post-dialling signalling. The circuit arrangement operates independently of which terminal of an exchange battery in the central supply device is connected to ground. A second polarity reversal protection device (rectifier bridge) is used as an indicator of the polarity of the exchange battery, so that, dependent upon the polarity, different grounding paths are formed in the telephone station. The circuit arrangement is universally suitable for PBX exchanges.

Abstract translation: 本发明涉及一种用于电话台的电路装置，其具有与中央供电装置的接地连接，用于后拨号信令。 电路装置独立于中央供电装置中的交换电池的哪个端子连接到地。 使用第二极性反转保护装置（整流桥）作为交换电池极性的指示，从而根据极性，在电话台中形成不同的接地路径。 电路布置普遍适用于PBX交换机。

公开(公告)号：US4841568A

公开(公告)日：1989-06-20

申请号：US153319

申请日：1988-02-08

Applicant: Juergen Riesmeyer

Inventor： Juergen Riesmeyer

IPC: H04M1/53

CPC classification number: H04M1/53

Abstract: A circuit arrangement for a telephone station with earth connection to the central supply device for the purpose of post-dialing signaling, operates independently of whether the negative or the positive pole of the exchange battery is earthed. This is achieved by provided that, on the actuation of the earthing key, the earth connection of the telephone is connected to the unearthed pole of the exchange battery via a transistor network which functions differently in dependence upon the polarity of the exchange battery earthing. The circuit arrangement is universally suitable for PBX exchanges.

Abstract translation: 具有接地连接到中央供电装置以用于后拨号信号的电话机的电路装置独立于交换电池的负极或正极接地而工作。 这是通过在接地钥匙的致动上实现的，电话的接地连接通过晶体管网络连接到交换电池的未接地极，该晶体管网络根据交换电池接地的极性不同地起作用。 电路布置普遍适用于PBX交换机。