WO2024197871A1 - Circuit de pilotage poe - Google Patents

Circuit de pilotage poe Download PDF

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Publication number
WO2024197871A1
WO2024197871A1 PCT/CN2023/085636 CN2023085636W WO2024197871A1 WO 2024197871 A1 WO2024197871 A1 WO 2024197871A1 CN 2023085636 W CN2023085636 W CN 2023085636W WO 2024197871 A1 WO2024197871 A1 WO 2024197871A1
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WO
WIPO (PCT)
Prior art keywords
constant current
load
comparator
resistance
input end
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2023/085636
Other languages
English (en)
Inventor
Li Zheng DAI
Peng Lu
Zhi Hua YIN
Mao YANG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Ltd China
Siemens AG
Siemens Corp
Original Assignee
Siemens Ltd China
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Ltd China, Siemens AG, Siemens Corp filed Critical Siemens Ltd China
Priority to EP23929454.9A priority Critical patent/EP4670329A1/fr
Priority to CN202380092376.7A priority patent/CN120513604A/zh
Priority to PCT/CN2023/085636 priority patent/WO2024197871A1/fr
Publication of WO2024197871A1 publication Critical patent/WO2024197871A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/10—Current supply arrangements

Definitions

  • the present invention relates to the technical field of Power over Ethernet (POE) , and especially to a POE driving circuit.
  • POE Power over Ethernet
  • a POE port which can provide Ethernet communication and can provide a power source to supply power to a load.
  • the power supply aspect after a load is inserted into the POE port, it is necessary to test whether the inserted load is within a normal range, and the power supply to the load is enabled only when it is determined by testing that the above condition is met.
  • a POE driving circuit which can test whether a resistance of a load is within a normal range and enable power supply when the resistance of the load is within the normal range.
  • a POE driving circuit comprising a constant current source module, a control module and a switch module which are connected in sequence, and the switch module is provided between a first voltage source and a first node used for connection of a load, wherein
  • the constant current source module is used for outputting a constant current to the control module when the load is connected at the first node and has a resistance less than a preset maximum resistance;
  • control module is used for outputting a corresponding level signal to the switch module according to value comparison between the resistance of the load and a preset minimum resistance when the constant current is received;
  • the switch module is used for controlling the first voltage source on whether to supply power to the load, according to the received level signal.
  • the POE driving circuits as provided in the embodiments of the present invention, individually or in combination, can have at least the following technical effects:
  • the constant current source module When the load is connected at the first node and has a resistance less than a preset maximum resistance, the constant current source module will output a constant current to the control module. Therefore, when the control module receives the constant current, it means that the resistance of the connected load is less than the preset maximum resistance. When the control module receives the constant current, it is only necessary for the control module to compare the resistance of the load with the preset minimum resistance. Further, a corresponding level signal is generated according to the value comparison result and is sent to the switch module. The switch module, after receiving the level signal, will control the first voltage source on whether to supply power to the load according to the level signal.
  • the POE driving circuit (s) as provided in the embodiment (s) of the present invention can test whether the resistance of the load is within a normal range and enable power supply when the resistance of the load is within the normal range.
  • the control module comprises a comparison unit which comprises a first comparator.
  • the negative input end of the first comparator has a voltage value equal to a product of the constant current multiplied by the preset minimum resistance
  • the positive input end of the first comparator has a voltage value equal to a product of the constant current multiplied by the resistance of the load. Therefore, by comparison of the voltage values, a result of value comparison between the resistance of the load and the preset minimum resistance can be obtained. As can be seen, by comparison of the voltages, it is possible to determine whether the resistance of the load is higher than the preset minimum resistance.
  • the third voltage source has a voltage value equal to a product of the constant current multiplied by the preset maximum resistance.
  • a result of value comparison between the resistance of the load and the preset minimum resistance can be obtained.
  • the determination for the current it is possible to determine whether the connected load is disconnected and whether the resistance of the load is higher than the preset maximum resistance.
  • the resistance of the load is within a normal range and the power supply to the load is enabled when the resistance of the load is within the normal range, and such logic can be achieved only by the hardware circuit (s) , without the related software logic and without high-cost devices having software logic capability, such as a processor or a controller, thus reducing the cost.
  • control module comprises a comparison unit and an optical coupling unit. It is to make judgment by both the output signal from the optical coupling unit and the level signal output from the comparison unit, thus preventing misjudgment and improving accuracy.
  • Figure 1 is a structural block diagram of a POE driving circuit in an embodiment of the present invention.
  • Figure 2 is a circuit diagram of a POE driving circuit, with a load connected, in an embodiment of the present invention.
  • a POE driving circuit is provided.
  • the POE driving circuit 100 comprises a constant current source module 10, a control module 20 and a switch module 30 which are connected in sequence, and the switch module 30 is provided between a first voltage source Vcc1 and a first node P used for connection of a load, wherein
  • the constant current source module 10 is used for outputting a constant current to the control module when the load is connected at the first node and has a resistance less than a preset maximum resistance;
  • control module 20 is used for outputting a corresponding level signal to the switch module according to value comparison between the resistance of the load and a preset minimum resistance when the constant current is received;
  • the switch module 30 is used for controlling the first voltage source on whether to supply power to the load, according to the received level signal.
  • the POE is an abbreviation of Power over Ethernet.
  • the first node has a function of connection of the load, and the first node is the POE-P node.
  • the load is connected between the POE-P node and a grounded POE-M node. Therefore, it is possible to consider that the load is connected between the POE-P node and a ground end.
  • the preset maximum resistance is configured according to the user requirement
  • the preset minimum resistance to be mentioned hereinafter is also configured according to the user requirement.
  • the first voltage source When the resistance of the connected load is between the preset maximum resistance and the preset minimum resistance, the first voltage source will supply power to the load.
  • the resistance of the connected load When the resistance of the connected load is less than or equal to the preset minimum resistance, or higher than or equal to the preset maximum resistance, the first voltage source will not supply power to the load.
  • the POE driving circuits in the embodiments of the present invention.
  • the POE driving circuit with the above structure is provided in the embodiment (s) of the present invention.
  • the constant current source module when the load is connected at the first node and the resistance of the load is less than the preset maximum resistance, the constant current source module will output a constant current to the control module.
  • the control module receives the constant current, it means that the resistance of the connected load is less than the preset maximum resistance.
  • the control module receives the constant current, it is only necessary for the control module to compare the resistance of the load with the preset minimum resistance, and thus generate a corresponding level signal according to the value comparison result and send the level signal to the switch module.
  • the switch module after receiving the level signal, will control the first voltage source on whether to supply power to the load, according to the level signal.
  • the control module when the resistance of the load is higher than the preset minimum resistance, the control module generates the level signal with high level. When the resistance of the load is less than or equal to the preset minimum resistance, the control module generate the level signal with low level. With the high level, the switch module will control the first voltage source to supply power to the load, and with the low level, the switch module will control the first voltage source not to supply power to the load, thus achieving the above purpose.
  • the constant current source module may be further used for: not outputting any current to the control module when the resistance of the load is higher than or equal to the preset maximum resistance; the control module may be further used for not outputting any level signal when the constant current is not received; and the switch module may be further used for controlling the first voltage source not to supply power to the load when the level signal is not received.
  • the constant current source module when the resistance of the load is higher than or equal to the preset maximum resistance, the constant current source module will not output any current to the control module; when the control module fails in receiving the constant current, it will not output the level signal; and when the switch module fails in receiving the level signal, it will not control the first voltage source to supply power to the load.
  • a processing manner is clearly described for the case of the resistance of the load higher than or equal to the preset maximum resistance, thus further ensuring that the above purpose can be achieved.
  • the control module comprises a comparison unit 21 which comprises a first comparator U1 wherein the first comparator U1 has a positive input end connected with the output end of the constant current source module and the first node P, with the load Rx connected between the first node P and a ground end; the first comparator U1 has a negative input end having a voltage value Vin2 equal to a product of the constant current Iout multiplied by the preset minimum resistance; the first comparator has an output end connected with the switch module; and when the control module receives the constant current, the positive input end of the first comparator has a voltage value Vd equal to a product of the constant current Iout multiplied by the resistance of the load Rx; and the first comparator U1 is specifically used for: outputting the level signal as a first level such that the switch module controls the first voltage source Vcc1 not to supply power to the load Rx when the constant current is received and the resistance of the load Rx is less than or equal to the preset minimum resistance and thus the voltage
  • the output end of the constant current source module, the positive input end of the first comparator, the first node, the load and the ground end are connected in sequence, thus forming a loop.
  • the voltage value at the positive input end of the first comparator equals to a product of the constant current multiplied by the resistance of the load.
  • the voltage value at the positive input end of the first comparator is related to the resistance of the load, and reflects the resistance of the load.
  • the voltage value at the negative input end of the first comparator is a product of the constant current multiplied by the preset minimum resistance. That is, the voltage value at the negative input end of the first comparator is a constant voltage value which reflects the preset minimum resistance.
  • the first comparator when the positive input end of the first comparator receives the constant current, if the resistance of the load is less than or equal to the preset minimum resistance, the voltage value at the positive input end of the first comparator is less than or equal to the voltage value at the negative input end of the first comparator. In this case, the first comparator will output the first level such that the switch module controls the first voltage source not to supply power to the load.
  • the positive input end of the first comparator receives the constant current, if the resistance of the load is higher than the preset minimum resistance, the voltage value at the positive input end of the first comparator is higher than the voltage value at the negative input end of the first comparator.
  • the first comparator will output the second level such that the switch module controls the first voltage source to supply power to the load.
  • the first comparator when the resistance of the connected load is higher than the preset minimum resistance, the voltage value at the positive input end of the first comparator is higher than the voltage value at the negative input end of the first comparator. In this case, the first comparator will output the level signal with high level such that the switch module controls the first voltage source to supply power to the load.
  • the resistance of the connected load is less than or equal to the preset minimum resistance
  • the voltage value at the positive input end of the first comparator is less than or equal to the voltage value at the negative input end of the first comparator. In this case, the first comparator will output the level signal with low level such that the switch module controls the first voltage source not to supply power to the load.
  • the above first comparator can output corresponding level signal to the switch module, according to the value comparison between the resistance of the connected load and the preset minimum resistance, such that the switch module controls the first voltage source on whether to supply power to the load.
  • the comparison unit may further comprise a first diode D1 provided between the positive input end of the first comparator and the output end of the constant current source module, with a positive electrode of the first diode D1 connected with the output end the constant current source module and a negative electrode of the first diode D1 connected with the positive input end of the first comparator.
  • a first diode is additionally provided between the positive input end of the first comparator and the output end of the constant current source module.
  • the first diode in the loop formed by the output end of the constant current source module, the positive input end of the first comparator, the first node, the load and the ground end, the current can flow in only one direction. Therefore, when the voltage value at the positive input end of the first comparator is higher than that of a third voltage source in the constant current source module, the output end of the constant current source module does not output any current. That is, there is no current in the above loop in this case. In this case, the first comparator will not output the level signal, and the switch module will not drive the first voltage source to supply power to the load.
  • the constant current source module will output the constant current to the control module only when the load is connected at the first node and the resistance of the load is less than the preset maximum resistance.
  • control module may further comprise an optical coupling unit 22 which is provided between the output end of the constant current source module and the positive electrode of the first diode D1 and is connected with the switch module; the optical coupling unit 22 is used for outputting the second level when the constant current output from the constant current source module is received, and not outputting any signal when the constant current output from the constant current source module is not received; wherein when the optical coupling unit 22 outputs the second level and the comparison unit 21 outputs the first level, the second level output from the optical coupling unit 22 is pulled to the first level such that the switch module controls the first voltage source Vcc1 not to supply power to the load Rx; when the optical coupling unit 22 outputs the second level and the comparison unit 21 outputs the second level, the switch module can control the first voltage source Vcc1 to supply power to the load Rx.
  • optical coupling unit 22 when the optical coupling unit 22 outputs the second level and the comparison unit 21 outputs the second level, the switch module can control the first voltage source Vcc1 to supply power to the load R
  • an optical coupling unit is provided between the output end of the constant current source module and the positive electrode of the first diode, and both the optical coupling unit and comparison unit are connected with the switch module.
  • the optical coupling unit when receiving the constant current output from the constant current source module, will output the second level, such as a high level.
  • the comparison unit may output the second level or may output the first level, depending on the value comparison result between the resistance of the load and the preset minimum resistance.
  • the first comparator when the resistance of the load is less than or equal to the preset minimum resistance, the first comparator will output a low level. As the optical coupling unit outputs a high level, the high level output by the optical coupling unit will be pulled down to the low level. Thus, the switch module will receive the level signal with low level. When the resistance of the load is higher than the preset minimum resistance and is less than the preset maximum resistance, the first comparator will output a high level. As the optical coupling unit outputs a high level, the switch module will receive the level signal with high level.
  • the optical coupling unit will output a high level and the first comparator will output a high level.
  • the switch module will control the first voltage source to supply power to the load only when both of the optical coupling unit and the first comparator output high levels. If either of the first comparator and the optical coupling unit outputs a low level, the switch module will receive the level signal with low level. Therefore, with judgment by both cases, it is possible to prevent misjudgment.
  • the optical coupling unit 22 may comprise a photoelectric coupler; the photoelectric coupler has a first input end I1 connected with the output end of the constant current source, and a first output end O1 connected with the positive electrode of the first diode D1 and corresponding to the first input end I1; and the photoelectric coupler has a second input end I2 connected via a pull-up resistor Rf with a second voltage source Vcc2 and a second output end O2 connected with the switch module and corresponding to the second input end I2.
  • the constant current is less than a driving current of the photoelectric coupler.
  • the photoelectric coupler has four ends: a first input end, a first output end, a second input end and a second output end wherein the first input and output ends are a pair of ends, and the second input and output ends are a pair of ends. That is, the current flowing in the first input end will be output from the first output end, and the current flowing in the second input end will be output from the second output end.
  • the first input end is connected with the output end of the constant current source. Therefore, when the first input end of the photoelectric coupler receives the constant current, the constant current will flow from the first output end and further to the positive electrode of the first diode.
  • the second input end of the photoelectric coupler is connected with an end of the pull-up resistor and the other end of the pull-up resistor is connected with the second voltage source.
  • the second voltage source will generate a driving current by the pull-up resistor.
  • the driving current then flows from the second input end into the photoelectric coupler such that a second level is output at the second output end.
  • the constant current is less than the driving current of the photoelectric coupler. Therefore, as long as the constant current flows into the first input end, the photoelectric coupler will output a second level at the second output end.
  • the constant current source module may be further used for: not outputting any current to the control module when the load is disconnected from the ground end or from the first node such that the photoelectric coupler does not output any signal at its second output end and the first comparator does not output any signal at its output end; and the switch module is used for controlling the first voltage source not to supply power to the load when the photoelectric coupler does not output any signal and the first comparator does not output any signal.
  • the switch module controls the first voltage source not to supply power to the load.
  • the constant current source module may comprise a second comparator U2, a third voltage source Vcc3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5 wherein
  • the first resistor R1 is connected between a positive input end of the second comparator U2 and a first input voltage Vin1;
  • the second resistor R2 is connected between a negative input end of the second comparator U2 and the output end of the constant current source module;
  • the third resistor R3 is connected between an output end of the second comparator and the output end of the constant current source module, wherein the third resistor has a resistance equal to that of the second resistor;
  • the fourth resistor R4 is connected between the negative input end of the second comparator and the ground end;
  • the fifth resistor R5 is connected between the negative input end of the second comparator U2 and the output end of the second comparator U2, the fifth resistor R5 has a resistance equal to that of the fourth resistor R4;and the second comparator U2 is connected with the third voltage source Vcc3, and the third voltage source Vcc3 has a voltage value equal to a product of the constant current Iout multiplied by the preset maximum resistance.
  • the third resistor has a resistance equal to that of the second resistor and the fifth resistor has a resistance equal to that of the fourth resistor. These two conditions are provided to ensure that the constant current source module can output the constant current.
  • the third voltage source has a voltage value equal to a product of the constant current multiplied by the preset maximum resistance. That is, the third voltage source has a constant voltage value which is equal to a product of the constant current multiplied by the preset maximum resistance. Therefore, when the resistance of the load is less than the preset maximum resistance, the voltage value at the positive input end of the first comparator is less than the voltage value of the third voltage source, and the constant current source module will output the constant current only in this case.
  • the constant current source module When the resistance of the load is higher than or equal to the preset maximum resistance, the voltage value at the positive input end of the first comparator is higher than or equal to the voltage value of the third voltage source, and the constant current source module will not output the constant current in this case.
  • the voltage of the third voltage source ensures that when the load is connected at the first node and the resistance of the load is less than the preset maximum resistance, the constant current source module will output the constant current to the control module.
  • the constant current depends on the first input voltage and the value comparison result between the resistors.
  • the switch module may comprise a metal oxide semiconductor (MOS) tube which has a source electrode used as an input end of the switch module, a gate electrode connected with the first voltage source, and a drain electrode connected with the first node, wherein a second diode D2 is connected in parallel between the gate electrode and the drain electrode of the MOS tube.
  • MOS metal oxide semiconductor
  • the MOS tube is a NMOS tube.
  • the source electrode of the NMOS tube receives a high level, the gate electrode and the drain electrode are conducted to each other, and thus the first voltage source will supply power to the load.
  • the source electrode of the NMOS tube receives a low level, the gate electrode and the drain electrode are not conducted to each other, and thus the first voltage source will not supply power to the load.
  • it is very simple and easy to use the MOS tube as the switch module to control the first voltage source on whether to supply power to the load.
  • a capacitor C1 is connected between the output end of the first comparator U1 and the ground end.
  • the first comparator when the resistance of the load is less than or equal to the preset minimum resistance, the voltage value at the positive input end of the first comparator is less than or equal to the voltage value at the negative input end of the first comparator, and thus the first comparator will output a low level.
  • the photoelectric coupler is in the ON state and its second output end outputs a high level.
  • the high level will be pulled down by the low level output by the first comparator. Therefore, the NMOS tube can not be opened, that is, the gate electrode and the drain electrode are in the cut-off state therebetween.
  • the voltage value at the positive input end of the first comparator is higher than the power supply voltage of the second comparator in the constant current source module, i.e. the voltage of the third voltage source. Therefore, in the loop formed by the output end of the constant current source module, the first input end and the first output end of the photoelectric coupler, the first diode, the positive input end of the first comparator, the first node, the load and the ground end, no current exists, that is, the loop is in the open-circuit state. Therefore, the photoelectric coupler will not output any signal at its second output end and the first comparator will not output any signal at its output end.
  • the gate electrode and the drain electrode of the NMOS tube are in the cut-off state therebetween. Therefore, in the above two cases, the first voltage source will not supply power to the load.
  • the resistance of the load is less than the preset maximum resistance and is higher than the preset minimum resistance
  • the voltage value at the positive input end of the first comparator is less than that of the third voltage source. Therefore, the constant current exists in the loop, and the photoelectric coupler will output a high level.
  • the voltage value at the positive input end of the first comparator is higher than the voltage value at the negative input end of the first comparator, and thus the first comparator will output a high level.
  • the gate electrode and the drain electrode of the NMOS tube are in the conduction state therebetween, and the first voltage source will supply power to the load.
  • the load is disconnected by the user.
  • the loop where the load is connected is disconnected, that is, the loop is in the open-circuit state. In this case, there is no current in the above loop.
  • the photoelectric coupler will not output any signal and the first comparator will not output any signal.
  • the gate electrode and the drain electrode of the NMOS tube are in the cut-off state therebetween and the first voltage source will stop supplying power to the load.
  • the POE driving circuit (s) as provided in the embodiment (s) of the present invention, with the determination for the current, it is possible to determine whether the connected load is disconnected and whether the resistance of the load is higher than the preset maximum resistance. By comparison of the voltages, it is possible to determine whether the resistance of the load is higher than the preset minimum resistance.
  • it is possible to determine whether the resistance of the load is within a normal range and the power supply to the load is enabled when the resistance of the load is within the normal range, and such logic can be achieved only by the hardware circuit (s) , without the related software logic and without high-cost devices having software logic capability, such as a processor or a controller, thus reducing the cost.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Electronic Switches (AREA)

Abstract

Les modes de réalisation de la présente invention concernent un circuit de pilotage POE comprenant un module de source de courant constant, un module de commande et un module de commutation raccordés dans l'ordre. Le module de commutation est disposé entre une première source de tension et un premier nœud utilisé pour le raccordement d'une charge. Le module de source de courant constant est utilisé pour délivrer un courant constant au module de commande lorsque la charge est raccordée au niveau du premier nœud et a une résistance inférieure à une résistance maximale prédéfinie. Le module de commande est utilisé pour délivrer un signal de niveau correspondant au module de commutation en fonction d'une comparaison de valeurs entre la résistance de la charge et une résistance minimale prédéfinie lors de la réception du courant constant. Le module de commutation est utilisé pour commander, en fonction du signal de niveau reçu, l'activation de la première source de tension s'il faut délivrer un courant à la charge. La présente invention permet de tester si une résistance d'une charge se situe dans une plage normale et d'activer une alimentation en courant lorsque la résistance de la charge se situe dans la plage normale.
PCT/CN2023/085636 2023-03-31 2023-03-31 Circuit de pilotage poe Ceased WO2024197871A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP23929454.9A EP4670329A1 (fr) 2023-03-31 2023-03-31 Circuit de pilotage poe
CN202380092376.7A CN120513604A (zh) 2023-03-31 2023-03-31 有源以太网驱动电路
PCT/CN2023/085636 WO2024197871A1 (fr) 2023-03-31 2023-03-31 Circuit de pilotage poe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2023/085636 WO2024197871A1 (fr) 2023-03-31 2023-03-31 Circuit de pilotage poe

Publications (1)

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WO2024197871A1 true WO2024197871A1 (fr) 2024-10-03

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090085586A1 (en) * 2007-10-02 2009-04-02 Micrel, Inc. Detection of presence or absence of ac maintain power signature in power-over-ethernet system
CN105048439A (zh) * 2015-08-10 2015-11-11 福建星网锐捷网络有限公司 一种供电控制方法和装置
US20180139062A1 (en) * 2016-11-17 2018-05-17 General Electric Company Process Control Device Using Power over Ethernet with Configurable Analog and Digital Interface
CN110431344A (zh) * 2017-02-14 2019-11-08 胡贝尔公司 用于以太网供电光源的备用电源和控制
US20210306750A1 (en) * 2020-03-31 2021-09-30 Sennheiser Electronic Gmbh & Co. Kg Device and Method for Supplying Power

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090085586A1 (en) * 2007-10-02 2009-04-02 Micrel, Inc. Detection of presence or absence of ac maintain power signature in power-over-ethernet system
CN105048439A (zh) * 2015-08-10 2015-11-11 福建星网锐捷网络有限公司 一种供电控制方法和装置
US20180139062A1 (en) * 2016-11-17 2018-05-17 General Electric Company Process Control Device Using Power over Ethernet with Configurable Analog and Digital Interface
CN110431344A (zh) * 2017-02-14 2019-11-08 胡贝尔公司 用于以太网供电光源的备用电源和控制
US20210306750A1 (en) * 2020-03-31 2021-09-30 Sennheiser Electronic Gmbh & Co. Kg Device and Method for Supplying Power

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CN120513604A (zh) 2025-08-19
EP4670329A1 (fr) 2025-12-31

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