Ethernet power supply

Patent metadata

Field	Value
Publication number	US-2023179436-A1
Application number	US-202217824512-A
Country	US
Kind code	A1
Filing date	May 25, 2022
Priority date	Dec 8, 2021
Publication date	Jun 8, 2023
Grant date	—

Abstract

An Ethernet power supply receives a DC voltage through a bus positive terminal and a bus negative terminal, and is coupled to a load device. The Ethernet power supply includes a first control module and a second control module. The first control module is used to provide a first control signal through the bus negative terminal to confirm whether the load device is a valid load. The second control module is used to connect or disconnect a coupling relationship between the bus positive terminal and the first control module according to the load device being connected or not.

First claim

What is claimed is:

1 . An Ethernet power supply configured to receive a DC voltage, and coupled to a load device, the Ethernet power supply comprising:
a first control module, configured to receive the DC voltage through a bus positive terminal and a bus negative terminal, and coupled to a negative end of the load device through the bus negative terminal so as to provide a first control signal through the bus negative terminal to confirm whether the load device is a valid load, and a second control signal is provided from a communication terminal to ground the bus negative terminal after the load device is confirmed as the valid load, and a second control module, coupled to a power terminal of the first control module and the bus positive terminal, and the second control module comprising: a switch unit, coupled to the bus positive terminal and the power terminal, and configured to connect or disconnect a coupling relationship between the power terminal and the bus positive terminal according to the load device being connected or not, a first control unit, coupled to the bus negative terminal and the switch unit, and configured to turn on or turn off the switch unit according to a terminal voltage of the bus negative terminal, and a second control unit, coupled to the communication terminal and the switch unit, and configured to turn on or turn off the switch unit according to the second control signal.

2 . The Ethernet power supply as claimed in claim 1 , wherein the first control unit is a first comparator; a first end of the first comparator is coupled to the bus negative terminal, a second end of the first comparator is coupled to a first reference voltage, and an output end of the first comparator is coupled to the switch unit; the first comparator is configured to compare the terminal voltage with the first reference voltage to provide a first comparison signal from the output end to control the switch unit.

3 . The Ethernet power supply as claimed in claim 1 , wherein the first control unit is a first switch circuit comprising a first transistor; a control end of the first transistor is coupled to the bus negative terminal, and a first end of the first transistor is coupled to the switch unit; the first switch circuit is configured to turn on or turn off the first transistor according to the terminal voltage to control the switch unit.

4 . The Ethernet power supply as claimed in claim 1 , wherein the second control unit is a second comparator; a first end of the second comparator is coupled to the communication terminal, a second end of the second comparator is coupled to a second reference voltage, and an output end of the second comparator is coupled to the switch unit; the second comparator is configured to compare the second control signal with the second reference voltage to provide a second comparison signal to control the switch unit.

5 . The Ethernet power supply as claimed in claim 1 , wherein the second control unit is a second switch circuit comprising a second transistor; a control end of the second transistor is coupled to the communication terminal, and a first end of the second transistor is coupled to the switch unit; the second switch circuit is configured to turn on or turn off the second transistor according to the second control signal to control the switch unit.

6 . The Ethernet power supply as claimed in claim 1 , wherein the switch unit comprises:
a path switch, a first end of the path switch coupled to the bus positive terminal, a second end of the path switch coupled to the power terminal, and a control end of the path switch coupled to the first control unit and the second control unit, wherein the first control unit and the second control unit are configured to turn on or turn off the path switch by controlling the control end of the path switch.

7 . The Ethernet power supply as claimed in claim 6 , wherein the switch unit further comprises:
a drive switch, a first end of the drive switch coupled to the control end of the path switch, and a control end of the drive switch coupled to the first control unit and the second control unit, wherein the first control unit and the second control unit are configured to control the drive switch to turn on or turn off the path switch by controlling the control end of the drive switch.

8 . An Ethernet power supply configured to receive a DC voltage, and coupled to a load device, the Ethernet power supply comprising:
a first control module, configured to receive the DC voltage through a bus positive terminal and a bus negative terminal, and coupled to a negative end of the load device through the bus negative terminal so as to provide a first control signal through the bus negative terminal to confirm whether the load device is a valid load, and a second control signal is provided from a communication terminal to ground the bus negative terminal after the load device is confirmed as the valid load, and a second control module, coupled to a power terminal of the first control module and the bus positive terminal, and the second control module comprising: a switch unit, coupled to the bus positive terminal and the power terminal, and configured to provide a lock-on state to connect a coupling relationship between the power terminal and the bus positive terminal according to the load device being connected, and provide an unlock-off state to disconnect the coupling relationship between the bus positive terminal and the power terminal according to the load device being disconnected, a trigger component, coupled to the bus negative terminal and the switch unit, and configured to trigger the switch unit to be the lock-on state according to the increase of a terminal voltage of the bus negative terminal, and an unlock circuit, coupled to the communication terminal and the switch unit, and configured to build an unlock voltage according to the second control signal, and control the switch unit to be the unlock-off state through the unlock voltage when the negative end of the load device is disconnected from the bus negative terminal.

9 . The Ethernet power supply as claimed in claim 8 , wherein the trigger component is a trigger switch; a first end of the trigger switch is coupled to the bus positive terminal, a second end of the trigger switch is coupled to the switch unit and the unlock circuit, and a control end of the trigger switch is coupled to the bus negative terminal.

10 . The Ethernet power supply as claimed in claim 8 , wherein the trigger component is a unidirectional conduction component; a first end of the unidirectional conduction component is coupled to the bus negative terminal, and a second end of the unidirectional conduction component is coupled to the switch unit and the unlock circuit; the first end of the unidirectional conduction component is forward direction to the second end of the unidirectional conduction component.

11 . The Ethernet power supply as claimed in claim 8 , wherein the unlock circuit comprises:
a first unlock switch, a control end of the first unlock switch coupled to the communication terminal, a second unlock switch, a first end of the second unlock switch coupled to the trigger component and the switch unit, and a control end of the second unlock switch coupled to a first end of the first unlock switch, and an energy storage component, coupled to the communication terminal and the control end of the second unlock switch, wherein the first unlock switch is turned on when the second control signal is a first potential so that the energy storage component is charged to build the unlock voltage; the first unlock switch is turned off when the second control signal is

Assignees

• Delta Electronics Inc

Inventors

• Peng Yung-Wei
• Tu Kuan-Hsien
• Liu Cheng-En

Classifications

• Y02D30/50

  in wire-line communication networks, e.g. low power modes or reduced link rate · CPC title

• H04L12/10 Primary

  Current supply arrangements · CPC title