Patent ID: 8726058
Filing Date: 2014-05-13
Classification: H04L

Abstract:
1. A power supply system, comprising: a power sourcing equipment; and a powered device configured to receive power from the power sourcing equipment via a pair of lines, wherein the power sourcing equipment starts power supply to the powered device after outputting a detection signal to the powered device via the pair of lines and detecting a first predetermined response made by the powered device to the detection signal, and the first predetermined response indicates that the powered device is connected to the pair of lines, wherein the powered device includes a storage unit configured to store power, and a correction unit configured to correct an impedance unbalance in the pair of lines, wherein the storage unit stores power obtained from the detection signal output from the power sourcing equipment and provides to the correction unit the stored power to operate the correction unit, and wherein the correction unit being provided with the stored power from the storage unit corrects, based on a first voltage on a first line of the pair of lines and a second voltage on a second line of the pair of lines, the impedance unbalance in the pair of lines before the power sourcing equipment starts the power supply to the powered device.