Supply circuit for supplying a two-wire line
US7853008B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 5, 2005 |
| Grant date | Dec 14, 2010 |
| Priority date | — |
| Expiry date | Oct 13, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/76
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A supply circuit for supplying a two-wire line comprises a first resistor connected between a first supply voltage potential and a first two-wire line connection of a two-wire line, a current-limiting device connected between a second two-wire line connection of the two-wire line and a second supply voltage potential and providing the two-wire line with a limited current on the basis of a variable setting potential, and an impedance-matching device connected between the second two-wire line connection and the second supply voltage potential and providing the variable setting potential on the basis of a reference potential and a voltage across the current-limiting device. The first resistor has a first impedance and the impedance-matching device and the current-limiting device form a second impedance being present at the second two-wire connection. The first and second impedances are essentially the same.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.