SCR circuit for protecting central office end of telephone line
US8451576B2 · kind B2 · utility
0Cited by
26References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 30, 2008 |
| Grant date | May 28, 2013 |
| Priority date | — |
| Expiry date | Nov 20, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D89/60
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A protection circuit employing a pair of SCR devices connected respectfully from telephone line tip conductor and ring conductors to ground. The SCR devices are of the type providing internal semiconductor resistors between the gate and cathode terminals for sensing overcurrents in the telephone line conductors, and providing voltage sensitive semiconductor regions so that the SCR devices are sensitive to overvoltages on the telephone line conductors. A pair of diodes are connected across the cathode-anode terminals of the SCR devices to provide overvoltage protection for positive polarity overvoltages on the telephone line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.