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Determination of Effective Resistance Between a Power Sourcing Equipment and a Powered Device

  • US 20080164890A1
  • Filed: 01/07/2007
  • Published: 07/10/2008
  • Est. Priority Date: 01/07/2007
  • Status: Active Grant
First Claim
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1. A method of determining an effective resistance between a power sourcing equipment and a powered device, the powered device exhibiting an interface and an operational circuitry, the method comprising:

  • prior to connecting power to the operational circuitry of the powered device, impressing two disparate current flow levels (I1, I2) between the power sourcing equipment and the powered device;

    measuring the voltage at said powered device interface (VPD1, VPD2) responsive to each of said impressed disparate current levels;

    measuring the voltage at said power sourcing equipment (VPSE1, VPSE2) responsive to each of said impressed disparate current levels; and

    determining the effective resistance between the power sourcing equipment and the powered device responsive to said VPD1, PPD2, VPSE1, VPSE2, I1 and I2.

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