Power supply detection apparatus and method for detecting power to a power over ethernet device

Patent metadata

Field	Value
Publication number	US-12323258-B2
Application number	US-202218064024-A
Country	US
Kind code	B2
Filing date	Dec 9, 2022
Priority date	Jun 10, 2020
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

A power supply detection apparatus includes a power sourcing equipment (PSE) circuit, a power supply module, and a reverse circuit. The PSE circuit is configured to send a first sounding electrical signal and a second sounding electrical signal to the reverse circuit. The reverse circuit outputs the first sounding electrical signal to a wire-pair group of an Ethernet cable, performs reverse processing on the second sounding electrical signal, and outputs a reverse-processed second sounding electrical signal to the wire-pair group. The PSE circuit is configured to determine, using the first sounding electrical signal, a forward sounding result of a to-be-detected device; and determine a reverse sounding result of the to-be-detected device based on the second sounding electrical signal. The power supply detection apparatus is configured to determine that the to-be-detected device is a non-PD when the forward sounding result or the reverse sounding result is a short circuit.

First claim

What is claimed is:

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.

2. The power supply detection apparatus of claim 1 , wherein the reverse circuit is further configured to:
receive a control signal from the PSE; and
perform reverse processing on the second sounding electrical signal in response to receiving the control signal.

3. The power supply detection apparatus of claim 1 , wherein the PSE circuit comprises power supply output ports, wherein the power supply output ports comprise a first electric potential port configured to output a high electric potential,
wherein the first optical coupler comprises:
a first input port configured to connect to the PSE circuit;
a second input port configured to connect to a ground;
a first output port comprising:
a first end point configured to connect to a first wire-pair in the wire-pair group; and
a second end point connected to the first electric potential port that outputs the high electric potential and that is in the power supply output ports of the PSE circuit; and

a second output port comprising:
a third end point connected to the first electric potential port; and
a fourth end point configured to connect to a second wire-pair in the wire-pair group; and

wherein the second optical coupler comprises:
a third input port connected to the PSE circuit;
a fourth input port configured to connect to the ground;
a third output port comprising:
a fifth end point configured to connect to the second wire-pair; and
a sixth end point configured to connect to a second electric potential port that is configured to output a low electric potential and that is in the power supply output ports of the PSE circuit; and

a fourth output port comprising:
a seventh end point connected to the second electric potential port; and
an eighth end point configured to connect to the first wire-pair.

4. The power supply detection apparatus of claim 1 , further comprising a processor configured to:
obtain the forward sounding result from the PSE circuit;
obtain the reverse sounding result from the PSE circuit; and
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.

5. The power supply detection apparatus of claim 4 , wherein the processor is further configured to instruct the reverse circuit to perform reverse processing on the second sounding electrical signal.

6. The power supply detection apparatus of claim 1 , further comprising determining that the to-be-detected device is the non-PD based on a resistance value of the wire-pair group or a capacitance value of the wire-pair group.

7. A power supply chip, comprising:
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 connected 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.

8. The power supply chip of claim 7 , wherein the reverse circuit is further configured to:
receive a control signal from the PSE; and
perform reverse processing on the second sounding electrical signal in response to receiving the control signal.

9. The power supply chip of claim 7 , wherein the PSE circuit comprises power supply output ports, wherein the power supply output ports comprise a first electric potential port configured to output a high electric potential,
wherein the first optical coupler comprises:
a first input port configured to connect to the PSE circuit;
a second input port configured to connect to a ground;
a first output port comprising:
a first end point configured to connect to a first wire-pair in the wire-pair group; and
a second end point configured to connect to the first electric potential port that outputs the high electric potential and that is in the power supply output ports of the PSE circuit; and

a second output port comprising:
a third end point configured to connect to the first electric potential port; and
a fourth end point co

Assignees

• Huawei Tech Co Ltd
• Huawei Technolgoies Co Ltd

Inventors

• Gu Chao
• Xiang Jian
• Wang Donghui
• Ji Guirong
• Fu Shiyong
• Hua Rui

Classifications

• H04L12/40045

  Details regarding the feeding of energy to the node from the bus · CPC title

• G01R31/40

  Testing power supplies (testing photovoltaic devices H02S50/10) · CPC title

• G01R31/54

  Testing for continuity · CPC title

• G01R31/52 Primary

  Testing for short-circuits, leakage current or ground faults · CPC title

• G01R27/02

  Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant (by measuring phase angle only G01R25/00) · CPC title