Power supply circuits for data access arrangement enabling modem operation over a private line
US6373886B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 6, 2000 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Jan 6, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/26
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A power supply includes a dc voltage source and circuitry which powers a modem data access arrangement (DAA) while preventing dc voltages from being applied to a private line; i.e., the private line is effectively isolated from dc voltages generated by the voltage sources. The circuitry permits ac signals from the modem to travel substantially unhindered over the private line. A first embodiment includes a split winding transformer, and a capacitor coupled across the voltage source. A second embodiment includes a standard transformer, an inductor and a capacitor. A third embodiment includes two capacitors and two inductors. The capacitors are coupled to the inputs of the DAA, while the inductors are coupled between the poles of the voltage source and respective inputs of the DAA.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.