US 11,658,834 B2
Power sourcing equipment, powered device and line loss detection method for power over ethernet
Hung-Ming Chang, Hsinchu (TW)
Assigned to WISTRON NEWEB CORPORATION, Hsinchu (TW)
Filed by WISTRON NEWEB CORPORATION, Hsinchu (TW)
Filed on Jun. 21, 2021, as Appl. No. 17/352,418.
Claims priority of application No. 109127461 (TW), filed on Aug. 13, 2020.
Prior Publication US 2022/0052860 A1, Feb. 17, 2022
Int. Cl. H04L 12/10 (2006.01); H04L 12/12 (2006.01)
CPC H04L 12/10 (2013.01) [H04L 12/12 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A line loss detection method for Power over Ethernet (PoE), performed in a power sourcing equipment (PSE) of a PoE system, and the PSE being coupled with a powered device (PD) of the PoE system through an Ethernet port of the PSE, the line loss detection method comprising:
receiving an input voltage value transmitted back from the PD; and
calculating a line power loss between the PSE and the PD according to the input voltage value of the PD, and an output voltage value and an output current value of the PSE;
wherein the PD obtains the input voltage value by a voltage detection circuit, and the voltage detection circuit at least includes:
a voltage controlled oscillator coupled with an Ethernet port on the PD through a PD controller and at least one diode bridge, wherein the PD is coupled with the PSE through the Ethernet port, and the voltage controlled oscillator is configured to convert a voltage received by the PD controller into an output frequency;
an optocoupler coupled with the voltage controlled oscillator and configured to transmit the output frequency to a processor of the PD using light as a medium, so as to allow the processor of the PD to use an internal counter to count the output frequency to obtain a detection voltage value;
a voltage divider circuit coupled between the PD controller and the voltage controlled oscillator; and
a voltage regulator coupled between the voltage divider circuit and the voltage controlled oscillator.