US 12,323,258 B2
Power supply detection apparatus and method for detecting power to a power over ethernet device
Chao Gu, Nanjing (CN); Jian Xiang, Nanjing (CN); Donghui Wang, Nanjing (CN); Guirong Ji, Shenzhen (CN); Shiyong Fu, Shenzhen (CN); and Rui Hua, Shenzhen (CN)
Assigned to HUAWEI TECHNOLGOIES CO., LTD., Shenzhen (CN)
Filed by Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed on Dec. 9, 2022, as Appl. No. 18/064,024.
Application 18/064,024 is a continuation of application No. PCT/CN2021/099468, filed on Jun. 10, 2021.
Claims priority of application No. 202010522956.3 (CN), filed on Jun. 10, 2020.
Prior Publication US 2023/0107236 A1, Apr. 6, 2023
Int. Cl. H04L 12/10 (2006.01)
CPC H04L 12/10 (2013.01) 18 Claims
OG exemplary drawing
 
1. A power supply detection apparatus comprising:
a power sourcing equipment (PSE) circuit configured to:
send a first sounding electrical signal and a second sounding electrical signal; and
determine, based on the first sounding electrical signal, a forward sounding result of a to-be-detected device configured to connect to an Ethernet cable, wherein the forward sounding result indicates a powered device (PD) connection of the to-be-detected device, a non-PD connection of the to-be-detected device, or
a short circuit connection of the to-be-detected device;
a power supply connected to the PSE circuit, wherein the power supply is configured to supply power to the PSE circuit;
a reverse circuit comprising:
a first optical coupler connected to the PSE circuit and configured to:
receive the first sounding electrical signal; and
directly output the first sounding electrical signal to a wire-pair group of the Ethernet cable; and
a second optical coupler coupled to the first optical coupler and to the PSE circuit and configured to:
receive the second sounding electrical signal;
perform reverse processing on the second sounding electrical signal to obtain a reverse-processed sounding electrical signal; and
output the reverse-processed sounding electrical signal to the wire-pair group,
wherein the PSE circuit is further configured to determine a reverse sounding result of the to-be-detected device based on the reverse-processed sounding electrical signal, and
wherein the power supply detection apparatus is configured to determine that the to-be-detected device is a non-PD when the forward sounding result is the short circuit connection or the reverse sounding result is the short circuit connection; and
a diode, wherein the diode comprises:
an anode connected to the PSE circuit; and
a cathode connected to the power supply for protecting the power supply from damage from reverse voltage when the to-be-detected device is another PSE circuit.