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Circuit device and method of current limit-based disconnect detection

  • US 8,716,886 B2
  • Filed: 09/26/2008
  • Issued: 05/06/2014
  • Est. Priority Date: 09/26/2008
  • Status: Active Grant
First Claim
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1. A power sourcing equipment (PSE) device comprising:

  • at least one network port adapted to couple to a powered device to provide power and optionally data to the powered device via a network cable;

    a current limiter circuit coupled to the at least one network port and having an adjustable threshold; and

    a logic circuit coupled to the current limiter circuit and adapted to;

    reduce the adjustable threshold of the current limiter circuit to a threshold level that is below a nominal operating current level by selectively adjusting an effective resistance of a sense resistor coupled between the at least one network port and a power supply;

    after a period of time has elapsed during which the current limiter circuit is not activated, the logic circuit is adapted to determine that the powered device is disconnected from the at least one network port.

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