Power over ethernet system having hazard detection circuitry to detect potentially hazardous cable conditions
US7973538B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 21, 2008 |
| Grant date | Jul 5, 2011 |
| Priority date | — |
| Expiry date | Dec 10, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/52
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus includes power circuitry and hazard detection circuitry connectable to a multi-conductor cable. The power circuitry transfers electrical power from a power-sourcing equipment (PSE) to a powered device (PD) over the multi-conductor cable. The hazard detection circuitry senses an electrical characteristic of the multi-conductor cable and generates a detection signal indicating whether a potentially hazardous abnormal operating condition exists in the multi-conductor cable based on the sensed electrical characteristic. Examples include short-circuit detection circuitry which detects a hazard-producing short-circuit connection between sets of conductors that can cause a “stacking” or additive combining of PSE output voltages, and hot-cable detection circuitry detecting the presence of full operating voltage on the cable under abnormal conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.