CN101147355B - Adjusting current limit thresholds based on power requirement of powered device in system for providing power over communication link - Google Patents

Adjusting current limit thresholds based on power requirement of powered device in system for providing power over communication link Download PDF

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Publication number
CN101147355B
CN101147355B CN2006800093423A CN200680009342A CN101147355B CN 101147355 B CN101147355 B CN 101147355B CN 2006800093423 A CN2006800093423 A CN 2006800093423A CN 200680009342 A CN200680009342 A CN 200680009342A CN 101147355 B CN101147355 B CN 101147355B
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current
power
limit threshold
power supply
consumption equipment
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CN101147355A (en
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C·R·斯坦福
J·L·奚斯
K·T·苏
H·J·克里伯格
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Analog Devices International ULC
Linear Technology LLC
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Linear Technology LLC
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Priority claimed from US11/252,567 external-priority patent/US9769090B2/en
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    • Y02B70/325—
    • Y02B70/3275—
    • Y02B90/2638—
    • Y02B90/2646—
    • Y02B90/2653—
    • Y02B90/2669—
    • Y04S20/228—
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/242—Home appliances
    • Y04S20/244—Home appliances the home appliances being or involving heating ventilating and air conditioning [HVAC] units
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
    • Y04S40/125—
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/128—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment involving the use of Internet protocol

Abstract

A novel system for providing power over the Ethernet includes a current limit circuit for preventing an output current from exceeding a current threshold set at a prescribed level, and a foldback circuit for reducing the current threshold when an output voltage is lower than a prescribed voltage value. The foldback circuit may be controlled to operate in a high-power mode to increase the current threshold above the prescribed level.

Description

According to regulating current limit threshold by the power requirement of power consumption equipment in the system of communication link power supply
The application requires U.S. Provisional Patent Application number 60/646,509 priority, the applying date of this application is on January 25th, 2005, and denomination of invention is " system and method (SYSTEMAND METHOD FOR SUPPORTING ADVANCED POWER OVER ETHERNETSYSTEM) of supporting advanced Power over Ethernet system ".
Technical field
The present invention relates to electric power system, more particularly, relate to power requirement, be used to regulate system, as the circuit and the method for current limit threshold in Power over Ethernet (PoE) system by the communication link power supply according to power consumption equipment.
Background technology
In several years, Ethernet had become the most frequently used method of local area network (LAN) already in the past.IEEE802.3 group, the promoter of ethernet standard had developed the extension form of this standard already, was called IEEE 802.3af, and definition is powered by Ethernet cable.IEEE 802.3af standard definition Power over Ethernet (PoE) system, this system relate to by unshielded twisted pair electric power is transferred to the power consumption equipment (PD) that is positioned at the link opposite side from power supply units (PSE).Traditionally, the network equipment is such as IP phone, and Wireless LAN access point, personal computer need two with web camera and be connected: one is connected to LAN, and another is connected to electric power system.Described PoE system has eliminated and has needed additional outlets and wiring, to power to the network equipment.The substitute is, by being used for the Ethernet cable power supply of transfer of data.
Defined as the IEEE802.3af standard, PSE and PD are non-data entities, allow the network equipment utilization cable power supply similar with being used for transfer of data and obtain electric power.PSE is the equipment that is electrically connected to cable at physical point of attachment, and it is powered to link.PSE usually and Ethernet switch, router, hub or other network switching equipment or in stride power supply unit and link to each other.PD is the equipment that obtains power supply or request power supply.PD can with such as digital IP phone, wireless network access point, PDA or notebook computer docking station, charger for mobile phone links to each other with equipment such as HVAC thermostats.
The major function of PSE is the PD search link for request power supply, alternatively to the PD classification, if detect PD then to described link power supply, and the power supply on the monitoring link, and when no longer asking or needing, cut off the electricity supply.PD participates in the PD trace routine by the PoE detection signal that presents by the IEEE802.3af standard definition.
If detection signal is that effectively PD can select to present graded signal to PSE, how much electric power it can extract when powering on to be illustrated in.PD can be classified as rank 0 to rank 4.The PD of rank 1 needs PSE that 4.0W at least is provided, and the PD of rank 2 needs PSE that 7.0W at least is provided, and rank 0,3 or 4 PD need 15.4W at least.Really define the level not according to PD, PSE provides required electric power to PD.
When PD powers, PSE is with respect to some current limit threshold, as the maximum output current (I of PSE under short-circuit condition LIM) and overload current detection range (I CUT) monitor its output current.Specifically, PSE should bear any lead in the feed cable and take office the short circuit of his lead what and do not damage, if be no more than I by the current strength of described short circuit LIMIn addition, the output current as PSE surpasses I CUTTime exceed the overload time limit when (Tovld), can detect overload.
In many PSE, I LIMAnd I CUTValue be maintained at fixing horizontal by the respective range of IEEE802.3af standard definition.For example, I LIMValue can remain on 425mA, and I CUTValue can remain on 375mA.But, can work with various types of PD in order to make PSE, and satisfy various power requirements, wish current limit threshold can be regulated according to the requirement of PD.
In addition, the IEEE802.3af standard code input current limit threshold of PD.Specifically, standard is with the input inrush current I of PD InrushBeing limited in maximum is 400mA.But, wish to make the input current limit threshold to require to regulate according to PD.
Summary of the invention
The invention provides novel system and method, be used for regulating the current limit threshold of power supply unit and/or power consumption equipment (PD) according to the requirement of PD.
According to an aspect of the present invention, have the requirement decision-making circuit to the system of PD power supply, be used for determining the requirement of PD by communication link; And control circuit, be used for according to the PD requirement of determining the output signal of setup parameter restriction PSE.For example, PD can be powered by power supply unit (PSE) by Ethernet.
Specifically, described control circuit can as power requirement, be set current limit threshold according to the PD requirement of determining.For example, PSE can regulate according to the power requirement of PD at the maximum output current of short-circuit condition and/or the overload current detection range of PSE.
In addition, the input current threshold value of PD can be regulated according to the power requirement of PD.
According to one embodiment of present invention, control circuit can be selected the desired value of the current limit threshold of PSE according to the power requirement of PD in a plurality of predetermined values.Described decision-making circuit can be determined the power requirement of PD according to classification procedure.
PSE can also comprise and can be used to limit the output current of PSE by the current-limiting circuit of control circuit control.Specifically, described current-limiting circuit can be controlled output field effect transistor or the bipolar transistor of PSE, surpasses the maximum output current of PSE under short-circuit condition with the output current that prevents PSE.
In addition, when the time that the output current of PSE surpasses the overload current detection range of determining exceeded pre-specified time, described current-limiting circuit can make PSE can disconnect the output transistor of PSE.
The method according to this invention can be implemented following steps, to control power supply unit:
-determine by the power requirement of the load of power supply unit power supply and
-regulate current limit threshold according to the power requirement of determining.
Specifically, maximum output current and/or the accepted overload current of power supply unit of power supply unit under short-circuit condition can be regulated according to the power requirement of determining.
In addition, the maximum input current of load can be regulated according to the power requirement of determining.
According to a further aspect in the invention, the PoE system can comprise PD, to the PSE of PD power supply be used for regulating according to the information on the PD regulating circuit of the current limit threshold of PSE and/or PD.Specifically, described regulating circuit can be regulated current limit threshold according to the power requirement of PD.
According to another aspect of the present invention, local area network (LAN) comprises at least one pair of network node, and hub and is used to be connected network node and hub so that the telecommunication cable of data communication to be provided.Described hub has power supply unit, is used for powering to the load by telecommunication cable.Described network comprises the requirement decision-making circuit, is used for determining the requirement of load, and control circuit, is used for according to load provisioning request really, the electric current in the system of setup parameter restricted passage telecommunication cable power supply.
Specifically, described control circuit can be determined the current limit threshold of power supply unit and/or the input current threshold value of load according to the power requirement of load.
By following detailed description, those skilled in the art can understand other advantages of the present invention and aspect more easily, wherein, illustrate and disclosed embodiments of the invention, and only the form that is used to implement best mode of the present invention with explanation provides.As what will disclose, the present invention can implement with different embodiment with other, and its some details can be improved in various conspicuous modes, and all such improvement all do not depart from spirit of the present invention.Therefore, accompanying drawing and explanation are regarded as illustrative, rather than restrictive.
Description of drawings
Below to the detailed description of the embodiment of the invention by accessing best understanding in conjunction with the following drawings, wherein, feature is not necessarily drawn in proportion, but draws with form that can the best illustrated correlated characteristic, wherein:
Fig. 1 is the block diagram that current limliting governor motion of the present invention is shown.
Fig. 2 is the schematic diagram that current-limiting circuit work of the present invention is shown.
Embodiment
The present invention will utilize and regulate the maximum output current (I of PSE under short-circuit condition in Power over Ethernet (PoE) system LIM) value and overload current detection range (I CUT) value describes for example.But, apparent, the disclosed design of this paper can be applicable to any network.
For example, system of the present invention can be used in the Local Area Network, and described local area network (LAN) has a plurality of nodes, hub and node is connected to the telecommunication cable that hub is used to provide data communication.Described hub can comprise power supply unit, and described telecommunication cable can be used for powering to the load from power supply unit.
In addition, as recognized by those skilled in the art, design of the present invention can be used for regulating load, as the maximum input current value of PD.
Fig. 1 illustrates simplified block diagram, shows current limliting governor motion 10 of the present invention in the PoE system, and it comprises PSE12 and PD 14, can be connected to PSE12 by link 16, and described link can utilize the interior 2 or 4 groups of twisted-pair feeders of Ethernet cable to provide.For example, PSE12 can be placed on the independent chip.As following more detailed disclosure, current limliting governor motion 10 of the present invention can use PD to detect and stage circuit 18, threshold value control circuit 20 and current-limiting circuit 22 its operations of execution.Foregoing circuit can be arranged on the PSE chip 12.
Provide current-limiting circuit 22 among the PSE12, with response overcurrent incident, as short-circuit condition and overload.For example, IEEE802.3af standard-required PSE can bear any lead in the feed cable and take office the short circuit of his lead what and do not damage, if be no more than the electric current I that is known as PSE maximum output current under short-circuit condition by the current strength of described short circuit LM
In addition, IEEE802.3af standard-required PSE when detecting overload removes power supply from power interface.When the output current of PSE surpasses electric current I CUTThe time of (being called the overload current detection range) exceeds predetermined time interval, during as overload time limit (Tovld), can detect overload.
The output current of current-limiting circuit 22 monitoring PSE12 is so that electric current remains on I LIMOr be lower than I LIMIn addition, the output current as PSE12 surpasses I CUTTime when exceeding predetermined time interval, current-limiting circuit 22 indications make PSE12 can cancel the power supply to PD14.
In a lot of PSE, I LIMAnd I CUTValue remains on by the fixing horizontal in the respective range of IEEE802.3af standard definition.For example, I LIMValue can remain on 425mA, and I CUTValue can remain on 375mA.But, current limliting governor motion 10 of the present invention allows current limit threshold I LIMAnd I CUTRequire to regulate according to specific PD.
Specifically, can be according to the power requirement control current limit threshold of PD.For example, detection and stage circuit 18 can be used for providing the information of PD power requirement.Defined as the IEEE802.3af standard, PSE12 and PD14 participate in the PD trace routine, and during this period, PSE12 detects link 16 to detect PD.If detect PD, PSE12 checks the PD detection signal, is effectively or invalid to determine it.Effective and invalid detection signal has definition in the IEEE802.3af standard.Effectively the PD detection signal represents that PD is in the state that can accept power supply, and invalid PD detection signal represents that PD is in the state that can not accept to power.
If described signal is effective, PD can select to present graded signal to PSE, can extract how much electric power with indication when powering on.PD can be classified as rank 0-rank 4.The PD of rank 1 requires PSE that 4.0W at least is provided, and the PD of rank 2 requires PSE that 7.0W at least is provided, and the PD of rank 0,3 or 4 requires 15.4W at least.In addition, PD can be identified as himself requirement provides the higher power of power than IEEE802.3af standard-required equipment.High-power PSE can provide requested power.Therefore, the power requirement of PD can be in wide fluctuations.
PD detection and stage circuit 18 can be determined the power requirement of PD14, and provide corresponding information to threshold value control circuit 20, are used to produce the current limit threshold that is fit to determine power requirement.For example, threshold value control circuit 20 can interact with current limit look-up table, and described look-up table stores the current limit threshold I that is used for various PD power requirements LIMAnd I CUTValue.According to the particular value of PD14 power demand, threshold value control circuit 20 can be visited current limit look-up table, to be identified for the I of described certain power value LIMAnd I CUTValue.Threshold value control circuit 20 can comprise a plurality of current sources, according to the I that determines LIMAnd I CUTValue provides limits value alternatively, so that corresponding threshold voltage V to be provided to current-limiting circuit 22 LIMAnd V CUT
As shown in Figure 2, can provide the transmission of electricity to PD14 by the gate drive voltage of Gate (gate pole) end control external power MOSFET24 from PSE12.For example, MOSFET24 can be in a controlled manner be connected to-48V input power supply the PSE output port, satisfies the power requirement of PD.Current-limiting circuit 22 is by Sense (sensing) end, is connected to the voltage Vsense at the external sense resistor Rsense two ends of MOSFET24 by monitoring, monitors the output current of PSE12.
As mentioned above, threshold value control circuit 20 provides threshold voltage V to current-limiting circuit 22 LIM, described voltage can be according to being the I that specific PD power requirement is selected LIMValue is defined as I LIM* R SCurrent-limiting circuit 22 can be controlled the gate voltage of MOSFET, to surpass threshold voltage V at the voltage Vsense that is monitored LIMThe time, the output current of reduction PSE.For example, current-limiting circuit 22 can comprise operational amplifier, and it is with threshold voltage V LIMVsense makes comparisons with sensing voltage, and to produce output voltage, it surpasses threshold voltage V at voltage Vsense LIMThe time, the gate voltage of reduction MOSFET24.As a result, the output current of PSE12 is maintained at I LIMLevel or be lower than I LIMLevel.
In addition, threshold value control circuit 20 can provide threshold voltage V to current-limiting circuit 22 CUT, it can be according to being the I that specific PD power requirement is selected CUTValue is defined as I CUT* Rs.When monitoring voltage Vsense surpasses threshold voltage V CUTTime when exceeding predetermined time interval, current-limiting circuit 22 can be indicated, so that cancellation is to the power supply of PD14.Specifically, current-limiting circuit 22 can have the overload timer, when sensing voltage Vsense surpasses threshold voltage V CUTShi Qidong.If sensing voltage Vsense still is higher than V when the overload time limit by the timer definition expires CUTLevel, MOSFET24 can be disconnected, with the power supply of cancellation to PD14.For example, the overload time limit can be in the 50ms-75ms scope, to meet IEEE 802.3af standard.
Therefore, current limliting governor motion of the present invention is regulated I according to the power demand of specific PD LIMAnd/or I CUTThreshold value.
In addition, the IEEE802.3af standard is with the input inrush current I of PD InrushBe limited in maximum 400mA.Except the output current limiting threshold value of control PSE or replace control output current limiting threshold value, current limliting governor motion of the present invention can be used for regulating the input current limit threshold of PD.
For example, PD14 can comprise the input current-limiting circuit, and it makes comparisons input current and the input current threshold value of PD, input current is limited in the maximum by the input current threshold setting.Can require to regulate the input current threshold value according to the certain power of PD.Specifically, when power that PD has relatively high expectations, can make PD with bigger input current work.
More than explanation illustrates and has disclosed various aspects of the present invention.In addition, content shown and that disclose only is a preferred embodiment, but as mentioned above, should be appreciated that the present invention can use various other combinations, improve, and environment, and can in the inventive concept scope that this paper embodied, change or improve, with above-mentioned instruction, and/or the skills or knowledge of association area coupling.For example, except regulating I LIMAnd/or I CUTThreshold value, governor motion of the present invention can be regulated other signals and/or the parameter of PSE and/or PD according to the requirement of PD.
The foregoing description also can be used for explaining and becomes known for implementing best mode of the present invention, and makes that those skilled in the art can be with the form utilization of above-mentioned or other embodiment, and carries out various improvement according to the requirement of concrete application of the present invention or purposes.
Therefore, this specification is not to limit the invention to the disclosed form of this paper.In addition, wish appended claims is understood to include optional embodiment.

Claims (23)

1. one kind by the system of communication link to power consumption equipment PD power supply, comprising:
Current-limiting circuit is used for the electric current of supervisory control system, and described current-limiting circuit responds the first overcurrent incident, so that according to for responding first current limit threshold restriction electric current that the first overcurrent incident defines,
The power requirement decision-making circuit, be used for determining power consumption equipment PD power requirement and
The current limliting governor motion is used for regulating first current limit threshold according to the power consumption equipment PD power requirement of determining, so that be the regulated value that specific power consumption equipment PD power requirement produces first current limit threshold,
Described current-limiting circuit is provided the regulated value of first current limit threshold, so that respond the first overcurrent incident according to the regulated value of first current limit threshold.
2. system according to claim 1, wherein, power consumption equipment PD passes through Power over Ethernet by power supply unit PSE.
3. system according to claim 1, wherein, described current-limiting circuit is configured to respond the second overcurrent incident so that according to for respond second current limit threshold restriction electric current that the second overcurrent incident defines and
Described current limliting governor motion is set up according to the power consumption equipment PD power requirement of determining and regulates second current limit threshold, so that be the regulated value that specific power consumption equipment PD requires to produce second current limit threshold.
4. system according to claim 1, wherein, described current limliting governor motion is set for the power requirement according to power consumption equipment PD, regulates the maximum output current of power supply unit PSE under short-circuit condition.
5. system according to claim 1, wherein, described current limliting governor motion is set for the power requirement according to power consumption equipment PD, regulates the overload current detection range of power supply unit PSE.
6. system according to claim 1, wherein, described current limliting governor motion is set up the power requirement according to power consumption equipment PD, selects the desired value of current limit threshold in a plurality of predetermined values.
7. system according to claim 1, wherein, described current-limiting circuit can be used to limit the output current of power supply unit PSE by the control of current limliting governor motion.
8. system according to claim 7, wherein, described current-limiting circuit is set for the electrode of the output transistor of control power supply unit PSE, surpasses the definite maximum output current of power supply unit PSE under short-circuit condition with the output current that prevents power supply unit PSE.
9. system according to claim 7, wherein, described current-limiting circuit is set for when the time that the output current of power supply unit PSE surpasses the overload current detection range of determining exceeds pre-specified time, makes power supply unit PSE can disconnect the output transistor of power supply unit PSE.
10. system according to claim 2, wherein, described power decision-making circuit is configured to determine according to classification procedure the power requirement of power consumption equipment PD.
11. system according to claim 1, wherein, described current limliting governor motion is set for the power requirement according to power consumption equipment PD, regulates the input current limit threshold of power consumption equipment PD.
12. a method of controlling power supply unit may further comprise the steps:
By according to being first current limit threshold restriction electric current that the first overcurrent incident defines, respond the first overcurrent incident,
Determine power requirement by the load of power supply unit power supply,
According to the power requirement of determining regulate first current limit threshold and
In order to respond the first overcurrent incident, according to first current limit threshold restriction electric current of being regulated for the certain loads power requirement.
13. method according to claim 12, wherein, described power supply unit is regulated according to the power requirement of determining at the maximum output current of short-circuit condition.
14. method according to claim 12, wherein, the maximum overload electric current of described power supply unit is regulated according to the power requirement of determining.
15. method according to claim 12, wherein, the input current of described load is regulated according to the power requirement of determining.
16. the system by Power over Ethernet comprises:
Power consumption equipment PD,
To the power supply unit PSE of power consumption equipment PD power supply,
Current-limiting circuit is used for the electric current of supervisory control system, and described current-limiting circuit responds the first overcurrent incident, so that according to for responding first current limit threshold restriction electric current that the first overcurrent incident defines,
The power requirement decision-making circuit, be used for determining power consumption equipment PD power requirement and
Regulating circuit is used for regulating first current limit threshold according to the power consumption equipment PD power requirement of determining, so that be the regulated value that specific power consumption equipment PD requires to produce first current limit threshold,
Described current-limiting circuit is provided the regulated value of first current limit threshold, so that respond the first overcurrent incident according to the regulated value of first current limit threshold.
17. system according to claim 16, wherein, described regulating circuit is set for the power requirement according to power consumption equipment PD, regulates the maximum output current of power supply unit PSE under short-circuit condition.
18. system according to claim 16, wherein, described regulating circuit is set for the power requirement according to power consumption equipment PD, regulates the overload current detection range of power supply unit PSE.
19. system according to claim 16, wherein, described current-limiting circuit response is used to limit the output current of power supply unit PSE by the current limit threshold of regulating circuit definition.
20. system according to claim 16, wherein, described regulating circuit is set for the power requirement according to power consumption equipment PD, regulates the input current limit threshold of power consumption equipment PD.
21. a local area network (LAN) comprises:
At least one pair of network node,
Hub and
Telecommunication cable is used for described network node is connected to hub so that data communication to be provided,
Described hub has power supply unit, is used for powering to the load by telecommunication cable, and described network has:
The power requirement decision-making circuit is used for determining the power requirement of load,
Current-limiting circuit is used for the electric current of supervisory control system, and described current-limiting circuit responds the first overcurrent incident, so as according to for respond first current limit threshold restriction electric current that the first overcurrent incident defines and
The current limliting governor motion is used for regulating first current limit threshold according to the power consumption equipment PD power requirement of determining, so that be the regulated value that specific power consumption equipment PD requires to produce first current limit threshold,
Described current-limiting circuit is provided the regulated value of first current limit threshold, so that respond the first overcurrent incident according to the regulated value of first current limit threshold.
22. network according to claim 21, wherein, described current limliting governor motion is set for the power requirement according to load, determines the output current limiting threshold value of power supply unit.
23. network according to claim 21, wherein, described current limliting governor motion is set for the power requirement according to load, determines the input current limit threshold of load.
CN2006800093423A 2005-01-25 2006-01-13 Adjusting current limit thresholds based on power requirement of powered device in system for providing power over communication link Active CN101147355B (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US64650905P 2005-01-25 2005-01-25
US60/646,509 2005-01-25
US11/252,567 US9769090B2 (en) 2005-01-25 2005-10-19 Adjusting current limit thresholds based on power requirement of powered device in system for providing power over communication link
US11/252,567 2005-10-19
PCT/US2006/001284 WO2006081083A2 (en) 2005-01-25 2006-01-13 Adjusting current limit thresholds based on power requirement of powered device in system for providing power over communication link

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CN101147355A CN101147355A (en) 2008-03-19
CN101147355B true CN101147355B (en) 2011-05-18

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CN2006800031925A Active CN101112042B (en) 2005-01-25 2006-01-09 Distinguishing network interface card from short circuit condition in power over Ethernet system
CN200680005472.XA Active CN101124775B (en) 2005-01-25 2006-01-09 Dual-mode detection of powered device in power over Ethernet system
CN2006800093508A Active CN101156355B (en) 2005-01-25 2006-01-09 Detecting legacy powered device in power over Ethernet system
CN2006800093495A Expired - Fee Related CN101147357B (en) 2005-01-25 2006-01-09 High-power foldback mechanism in system for providing power over communication link
CNA2006800054630A Pending CN101124771A (en) 2005-01-25 2006-01-09 Power sourcing equipment having auto-zero circuit for determining and controlling output current
CN2006800093423A Active CN101147355B (en) 2005-01-25 2006-01-13 Adjusting current limit thresholds based on power requirement of powered device in system for providing power over communication link
CNA200680003193XA Pending CN101129019A (en) 2005-01-25 2006-01-13 Combination of high-side and low-side current sensing in system for providing power over communication link
CN200680003200.6A Active CN101116285B (en) 2005-01-25 2006-01-13 System, method and regional network with electricity provided by communication link
CNA2006800054715A Pending CN101124774A (en) 2005-01-25 2006-01-19 Power using delivery to power supply device between detection and classification mode
CNA2006800054700A Pending CN101124773A (en) 2005-01-25 2006-01-19 Providing data communication between power supply device and powered device in system for supplying power over communication link
CN2006800054698A Active CN101124772B (en) 2005-01-25 2006-01-23 System for providing power over communication cable having mechanism for determining resistance of communication cable
CN2006800031997A Expired - Fee Related CN101112043B (en) 2005-01-25 2006-01-23 System, method and LAN for controlling power distribution among multiple wires of communication cables
CNA2006800093438A Pending CN101147356A (en) 2005-01-25 2006-01-24 Supplying power over four pairs of conductors in communication cable

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CN2006800031925A Active CN101112042B (en) 2005-01-25 2006-01-09 Distinguishing network interface card from short circuit condition in power over Ethernet system
CN200680005472.XA Active CN101124775B (en) 2005-01-25 2006-01-09 Dual-mode detection of powered device in power over Ethernet system
CN2006800093508A Active CN101156355B (en) 2005-01-25 2006-01-09 Detecting legacy powered device in power over Ethernet system
CN2006800093495A Expired - Fee Related CN101147357B (en) 2005-01-25 2006-01-09 High-power foldback mechanism in system for providing power over communication link
CNA2006800054630A Pending CN101124771A (en) 2005-01-25 2006-01-09 Power sourcing equipment having auto-zero circuit for determining and controlling output current

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CNA200680003193XA Pending CN101129019A (en) 2005-01-25 2006-01-13 Combination of high-side and low-side current sensing in system for providing power over communication link
CN200680003200.6A Active CN101116285B (en) 2005-01-25 2006-01-13 System, method and regional network with electricity provided by communication link
CNA2006800054715A Pending CN101124774A (en) 2005-01-25 2006-01-19 Power using delivery to power supply device between detection and classification mode
CNA2006800054700A Pending CN101124773A (en) 2005-01-25 2006-01-19 Providing data communication between power supply device and powered device in system for supplying power over communication link
CN2006800054698A Active CN101124772B (en) 2005-01-25 2006-01-23 System for providing power over communication cable having mechanism for determining resistance of communication cable
CN2006800031997A Expired - Fee Related CN101112043B (en) 2005-01-25 2006-01-23 System, method and LAN for controlling power distribution among multiple wires of communication cables
CNA2006800093438A Pending CN101147356A (en) 2005-01-25 2006-01-24 Supplying power over four pairs of conductors in communication cable

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CN101124774A (en) 2008-02-13
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CN101116285B (en) 2015-06-17
CN101112042A (en) 2008-01-23
CN101147355A (en) 2008-03-19
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CN101124773A (en) 2008-02-13
CN101124775A (en) 2008-02-13

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