Circuits and methods for detecting the presence of a powered device in a powered network
US7356588B2 · kind B2 · utility
65Cited by
6References
38Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 16, 2003 |
| Grant date | Apr 8, 2008 |
| Priority date | — |
| Expiry date | Jan 26, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/10
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Circuits and methods for detecting the presence of a powered device in a powered network connection and removing power from the powered network connection when no powered device is present are disclosed. The circuits and methods involve applying a time-varying voltage signal into an analog amplifier circuit that converts the voltage into a current indicative of the impedance of the connection. The analog amplifier circuit may be implemented with a dual-output trans-conductance amplifier that provides a digital voltage to indicate the removal of the powered device from the powered network connection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.