Apparatus for protecting a subscriber line interface circuit against overvoltages
US5668866A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 8, 1996 |
| Grant date | Sep 16, 1997 |
| Priority date | — |
| Expiry date | May 8, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H1/0038
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus interfaces with a subscriber line interface circuit (1) and protects the interface circuit (1) against overvoltages exceeding a supply voltage source supplied to the subscriber line interface circuit. The apparatus includes first and second diodes (DA1, DB1) having respective anodes connected to first and second input wires (A, B). The cathodes of the first and second diodes are connected to a positive terminal of the supply voltage source. The apparatus further includes third and fourth diodes (DA2, DB2) having cathodes connected the first and second input wires (A, B). The anodes of the third and fourth diodes are connected to a cathode of a thyristor (TAB). The anode of the thyristor, in turn, is connected to the positive terminal of the supply voltage source, and the gate the thyristor is connected to a negative terminal of the supply voltage source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.