Detection for four pair powered devices

• US 9,281,691 B2
• Filed: 02/19/2013
• Issued: 03/08/2016
• Est. Priority Date: 03/29/2012
• Status: Active Grant

• Current Assignee: Microsemi Corp. - Analog Mixed Signal Group, Ltd. (Microchip Technology Incorporated)
• Original Assignee: Microsemi Corp. - Analog Mixed Signal Group, Ltd. (Microchip Technology Incorporated)
• Inventors: Ferentz, Alon, Blaut, Roni
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): Vu, Toan
• Application Number:
  US13/769,968
• Publication Number:
  US 20130257161A1
• Time in Patent Office: 1,113 Days
• Field of Search: 307/80
• US Class Current: 1/1
• CPC Class Codes: H02J 4/00 Circuit arrangements for mains or distribution networks not specified as ac or dc
• CPC Class Codes: H04L 12/10 Current supply arrangements

Abstract

A twin power sourcing equipment constituted of: a first power sourcing equipment; and a second power sourcing equipment arranged for connection to a powered device over respective power paths; the first and second power sourcing equipments arranged to: simultaneously perform detection of the powered device; and in the event that at least one of the first and second power sourcing equipments detects the presence of the powered device, alternately perform detection of the powered device to detect a signature impedance; and in the event that each of the alternate detection is indicative of the presence of the signature impedance, provide power to the powered device simultaneously by the first and second power sourcing equipment. Power is not provided to the powered device in the event that the simultaneous detection is indicative of the absence of the powered device on each of the first path and the second path.

Claims

1. A local area network adapted to supply power to a plurality of types of powered devices over communication cabling, the local area network comprising:

a powered device;

a first power sourcing equipment;

a second power sourcing equipment; and

a communication cabling comprising a plurality of twisted wire pairs arranged to connect said first and second power sourcing equipment to said powered device, said communication cabling providing a first power path comprising a first set of twisted wire pairs of said communication cabling between said first power sourcing equipment and said powered device and a second power path comprising a second set of twisted wire pairs of said communication cabling between said second power sourcing equipment and said powered device, said first set different from said second set,

said first and second power sourcing equipments arranged to;

simultaneously perform detection of the powered device by each applying a detection voltage to said powered device via the respective one of the first path and the second path to detect said powered device, and determine whether said powered device is present or absent; and

in the event that at least one of said first and second power sourcing equipments detects the presence of the powered device by said simultaneous detection, alternately perform detection of the powered device by each alternately applying the detection voltage to said powered device via the respective one of the first path and the second path to detect a signature impedance; and

in the event that each of said alternate detection is indicative of the presence of the signature impedance, provide power to said powered device simultaneously by said first and second power sourcing equipment,

wherein the power is not provided to said powered device from either the first power sourcing equipment or the second power sourcing equipment in the event that said simultaneous detection is indicative of the absence of the powered device on each of the first path and the second path, and

wherein in the event that said simultaneous detection is indicative of the absence of the powered device on each of the first path and the second path, said first and second power sourcing equipments do not alternately perform the detection.

2. The local area network of claim 1, wherein each of said first and second power sourcing equipments are further arranged to perform classification on the respective one of the first and second paths responsive to successful detection of the signature impedance on the respective path by the respective one of the first and second power sourcing equipments, the classification classifying the power requirements of the powered device.

3. The local area network of claim 2, wherein in the event that only one of said alternate detection is indicative of the presence of the signature impedance, power is provided to said powered device by the respective one of said first and second power sourcing equipment associated with the detection of the presence of the signature impedance, the power provided subsequent to the performed classification.

4. The local area network of claim 1, wherein in the event that only one of said alternate detection is indicative of the presence of the signature impedance, power is provided to said powered device by the respective one of said first and second power sourcing equipment associated with the detection of the presence of the signature impedance.

5. A local area network adapted to supply power to a plurality of types of powered devices over communication cabling, the local area network comprising:

a powered device;

a first power sourcing equipment;

a second power sourcing equipment; and

a communication cabling comprising a plurality of twisted wire pairs arranged to connect said first and second power sourcing equipment to said powered device, said communication cabling providing a first power path comprising a first set of twisted wire pairs of said communication cabling between said first power sourcing equipment and said powered device and a second power path comprising a second set of twisted wire pairs of said communication cabling between said second power sourcing equipment and said powered device, said first set different from said second set,

said first and second power sourcing equipments arranged to;

simultaneously perform detection of the powered device by each applying a detection voltage to said powered device via the respective one of the first path and the second path to detect said powered device, and determine whether said powered device is present or absent; and

in the event that at least one of said first and second power sourcing equipments detects the presence of the powered device by said simultaneous detection, alternately perform detection of the powered device by each alternately applying the detection voltage to said powered device via the respective one of the first path and the second path to detect a signature impedance; and

in the event that each of said alternate detection is indicative of the presence of the signature impedance, provide power to said powered device simultaneously by said first and second power sourcing equipment,

wherein the power is not provided to said powered device from either the first power sourcing equipment or the second power sourcing equipment in the event that said simultaneous detection is indicative of the absence of the powered device on each of the first path and the second path, and

wherein in the event that said simultaneous detection is indicative of the absence of the powered device on each of the first path and the second path, said simultaneously performed detection is repeated after a predetermined time interval.

6. A twin power sourcing equipment comprising:

a first power sourcing equipment arranged for connection to a powered device over a first power path;

a second power sourcing equipment arranged for connection to the powered device over a second power path, said second power path different from said first power path;

said first and second power sourcing equipments arranged to;

simultaneously perform detection of the powered device by each applying a detection voltage to the powered device via the respective one of the first path and the second path to detect the powered device, and determine whether the powered device is present or absent; and

in the event that at least one of said first and second power sourcing equipments detects the presence of the powered device by said simultaneous detection, alternately perform detection of the powered device by each alternately applying the detection voltage to the powered device via the respective one of the first path and the second path to detect a signature impedance; and

in the event that each of said alternate detection is indicative of the presence of the signature impedance, provide power to the powered device simultaneously by said first and second power sourcing equipment,

wherein the power is not provided to the powered device from either the first power sourcing equipment or the second power sourcing equipment in the event that said simultaneous detection is indicative of the absence of the powered device on each of the first path and the second path, and

wherein in the event that said simultaneous detection is indicative of the absence of the powered device on each of the first path and the second path, said first and second power sourcing equipments do not alternately perform the detection.

7. The twin power sourcing equipment of claim 6, wherein each of said first and second power sourcing equipments are further arranged to perform classification on the respective one of the first and second paths responsive to successful detection of the signature impedance on the respective path by the respective one of the first and second power sourcing equipments, the classification classifying the power requirements of the powered device.

8. The twin power sourcing equipment of claim 7, wherein in the event that only one of said alternate detection is indicative of the presence of the signature impedance, power is provided to the powered device by the respective one of said first and second power sourcing equipment associated with the detection of the presence of the signature impedance, the power provided subsequent to the performed classification.

9. The twin power sourcing equipment of claim 6, wherein in the event that only one of said alternate detection is indicative of the presence of the signature impedance, power is provided to the powered device by the respective one of said first and second power sourcing equipment associated with the detection of the presence of the signature impedance.

10. A twin power sourcing equipment comprising:

a first power sourcing equipment arranged for connection to a powered device over a first power path;

a second power sourcing equipment arranged for connection to the powered device over a second power path, said second power path different from said first power path;

said first and second power sourcing equipments arranged to;

simultaneously perform detection of the powered device by each applying a detection voltage to the powered device via the respective one of the first path and the second path to detect the powered device, and determine whether the powered device is present or absent; and

in the event that at least one of said first and second power sourcing equipments detects the presence of the powered device by said simultaneous detection, alternately perform detection of the powered device by each alternately applying the detection voltage to the powered device via the respective one of the first path and the second path to detect a signature impedance; and

in the event that each of said alternate detection is indicative of the presence of the signature impedance, provide power to the powered device simultaneously by said first and second power sourcing equipment,

wherein the power is not provided to the powered device from either the first power sourcing equipment or the second power sourcing equipment in the event that said simultaneous detection is indicative of the absence of the powered device on each of the first path and the second path, and

wherein in the event that said simultaneous detection is indicative of the absence of the powered device on each of the first path and the second path, said simultaneously performed detection is repeated after a predetermined time interval.

11. A method of providing power from a first power sourcing equipment arranged for connection to a powered device over a first power path and a second power sourcing equipment arranged for connection to the powered device over a second power path, the second power path different from said first power path, the method comprising:

simultaneously determining, for each of the first power sourcing equipment and the second power sourcing equipment, whether the powered device is present or absent;

in the event the powered device is determined to be present by either the first power sourcing equipment or the second power sourcing equipment, alternately performing detection of the powered device via the respective one of the first path and the second path to detect a signature impedance;

in the event that each of said alternate detection is indicative of the presence of the signature impedance, providing power to said powered device simultaneously by said first and second power sourcing equipment;

performing classification on the respective one of the first and second paths by each of said first and second power sourcing equipments responsive to successful detection of the signature impedance on the respective path by the respective one of the first and second power sourcing equipments, the classification classifying the power requirements of the powered device; and

in the event that only one of said alternate detection is indicative of the presence of the signature impedance, providing power to said powered device by the respective one of said first and second power sourcing equipment associated with the detection of the presence of the signature impedance, the power provided subsequent to the performed classification,

wherein said power is not provided to said powered device from either the first power sourcing equipment or the second power sourcing equipment in the event that the powered device is determined to be absent by each of the first power sourcing equipment and the second power sourcing equipment during said simultaneous determining.

12. The method of claim 11, wherein said simultaneously determining comprises:

simultaneously performing detection of the powered device by each applying a detection voltage to said powered device via the respective one of the first path and the second path to detect said powered device, the powered device determined to be present in the event that at least one of said first and second power sourcing equipments detects the presence of the powered device by said simultaneous detection and the powered device determined to be absent in the event that both said first and second power sourcing equipments detect the absence of the powered device by said simultaneous detection, and

wherein said alternately performing detection comprises alternately applying the detection voltage to said powered device via the respective one of the first path and the second path to detect a signature impedance.

13. The method of claim 11, wherein in the event that the powered device is determined to be absent, said alternate detection is not performed.

14. A method of providing power from a first power sourcing equipment arranged for connection to a powered device over a first power path and a second power sourcing equipment arranged for connection to the powered device over a second power path, the second power path different from said first power path, the method comprising:

simultaneously determining, for each of the first power sourcing equipment and the second power sourcing equipment, whether the powered device is present or absent;

in the event the powered device is determined to be present by either the first power sourcing equipment or the second power sourcing equipment, alternately performing detection of the powered device via the respective one of the first path and the second path to detect a signature impedance; and

in the event that each of said alternate detection is indicative of the presence of the signature impedance, providing power to said powered device simultaneously by said first and second power sourcing equipment,

wherein in the event that the powered device is determined to be absent by each of the first power sourcing equipment and the second power sourcing equipment during said simultaneous determining, said determining is repeated after a predetermined time interval.