Subscriber loop current regulator
US4476351A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1982 |
| Grant date | Oct 9, 1984 |
| Priority date | — |
| Expiry date | Mar 25, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M19/001
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A current regulator for supplying dc power to a telephone line employs a resistor feed circuit in conjunction with a solid state feed circuit. The dc line current flowing through both such elements is monitored by a sensing circuit which drives the solid state element in a manner to maintain a desired magnitude of dc line current. The resistor value may be arbitrarily chosen so that the circuit power is shared in a desired proportion between the resistor and solid state element. When used in a telephone line in series with ac voice signals the regulator employs a capacitator and diode bridge arrangement to reduce the ac impedance thereof, improve longitudinal balance and allow bi-directional current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.