Isolated capacitive signature detection for powered devices
US7996166B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2007 |
| Grant date | Aug 9, 2011 |
| Priority date | — |
| Expiry date | May 29, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/10
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In one embodiment, a method for determining capacitive signature validity of a powered device (PD) attached to power sourcing equipment (PSE) having (i) an isolated side with a primary coil and (ii) a line side with a secondary coil connected to the PD. The method includes determining, on the isolated side, a first time T1 and a corresponding first voltage V1 across the PD. Then generating, on the isolated side, a switching signal used to generate an electrical current through the primary coil. Then determining, on the isolated side, a second time T2 and a corresponding second voltage V2 across the PD, wherein a difference between V2 and V1 is related to the electrical current provided to the primary coil. Then determining the capacitive-signature validity of the PD based on T1, T2, V1, V2, and a resistive signature of the PD.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.