Determination of effective resistance between a power...

Details Determination of effective resistance between a power... Determination of effective resistance between a power...

2007-01-07

2008-08-26

Nguyen, Vincent Q. (Department: 2831)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S522000, C324S691000

Reexamination Certificate

active

07417443

ABSTRACT:
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 the powered device interface (VPD1, VPD2) responsive to each of the impressed disparate current levels; measuring the voltage at the power sourcing equipment (VPSE1, VPSE2) responsive to each of the impressed disparate current levels; and determining the effective resistance between the power sourcing equipment and the powered device responsive to the VPD1, VPD2, VPSE1, VPSE2, I1and 12.

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IEEE Standards—802.3af-2003, pp. 36-57 (sections 33.2.3.7-33.3.6.1), p. 94-96; p. 102, p. 115, published Jun. 18, 2003, New York.

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