Surge protection for signal transmission systems
US4449157A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1982 |
| Grant date | May 15, 1984 |
| Priority date | — |
| Expiry date | Sep 27, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/46
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Secondary surge protection means for equipment connected to transmission lines, for example line-powered amplifiers interconnecting T1 or T1C telephone lines, includes two diode bridges and a pair of surge diverters. One diode bridge has its cathode/anode nodes connected one to each conductor of an incoming transmission line. The other diode bridge is connected in like manner to an outgoing transmission line. Each surge diverter interconnects the anode/anode node of one bridge and the cathode/cathode node of the other bridge. When a surge on one line causes the voltage across one or other diverter to exceed a predetermined threshold, the diverter conducts, shunting the surge past the amplifier to dissipate in the other line. The two transmission lines may be coupled to the input and output, respectively, of one amplifier, or to the input of one amplifier and the output of a different, oppositely connected amplifier. In both cases, power for the or each amplifier may be derived from the two lines, for example by a Zener diode interconnecting them in known manner. The characteristics of each surge diverter are such that it will respond to fast rise-time lightning pulses yet tolerate …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.