US Patent 7996166 Isolated capacitive signature detection for powered devices

Patent 7996166 was granted and assigned to Agere Systems on August, 2011 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Agere Systems

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7996166

Patent Inventor Names

Luis de la Torre Vega0

Fadi Saibi0

Date of Patent

August 9, 2011

Patent Application Number

11691112

Date Filed

March 26, 2007

Patent Primary Examiner

‌

Manuel L. Barbee

Patent 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.