CN101116285A - Distinguishing network interface card from short circuit condition in power over Ethernet system - Google Patents
Distinguishing network interface card from short circuit condition in power over Ethernet system Download PDFInfo
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- CN101116285A CN101116285A CNA2006800032006A CN200680003200A CN101116285A CN 101116285 A CN101116285 A CN 101116285A CN A2006800032006 A CNA2006800032006 A CN A2006800032006A CN 200680003200 A CN200680003200 A CN 200680003200A CN 101116285 A CN101116285 A CN 101116285A
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- Y02B70/325—
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- Y02B70/3275—
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- Y02B90/2638—
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- Y02B90/2646—
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- Y02B90/2653—
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- Y02B90/2669—
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- Y04S20/228—
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- 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
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- 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
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- Y04S40/125—
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- 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
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- 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
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- Measurement Of Resistance Or Impedance (AREA)
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- Tests Of Electronic Circuits (AREA)
- Power Sources (AREA)
- Measurement Of Current Or Voltage (AREA)
- Mobile Radio Communication Systems (AREA)
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
The application requires the priority of U.S. Provisional Patent Application number 60/646,509, and the applying date of this application is on January 25th, 2005, and denomination of invention is " system and method for supporting advanced Power over Ethernet system ".
Technical field
[0001] the present invention relates to electric power system, more particularly, relate to, for example the circuit and the method for the output voltage of power supply unit adjusting current limit threshold in Power over Ethernet (PoE) system according to system by the communication link power supply.
Background technology
[0002] in the past in the several years, Ethernet has become the most frequently used method of LAN.IEEE802.3 group, the promoter of ethernet standard had developed the extension form of this standard already, was called IEEE802.3af, 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.
[0003] as defined in the IEEE 802.3af standard, PSE and PD are non-data entities, allow the network equipment to use cable power supply similar with being used for transfer of data and acquisition 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 be associated.PD is the equipment that obtains power supply or request power supply.PDs can with such as digital IP phone, wireless network access point, PDA or notebook computer docking station, equipment such as charger for mobile phone and HVAC thermostat are associated.
[0004] major function of PSE is the PD search link for request power supply, alternatively PD is carried out 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 testing process by the PoE detection signal that presents by the IEEE802.3af standard definition.
[0005] if described detection signal is effective, PD has the selection that presents graded signal to PSE, and how many electric energy 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 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 rank 0,3 or 4 PD require 15.4W at least.According to the PD rank of determining, PSE provides required electric power to PD.
[0006] when when PD powers, PSE certain current limit threshold relatively monitors its output current, and described current limit threshold is the maximum output current (I of PSE under short-circuit condition for example
LIM) and overload current detection range (I
CUT).Specifically, PSE should bear that any electric wire in the feed cable is taken office the short circuit of his electric wire what and not impaired, if be no more than I by the current strength of this short circuit
LIMIn addition, the output current as PSE surpasses I
CUTTime exceed the overload time limit (T
Ovld) time, can detect overload.When detecting overload, PSE must be from the power interface deenergization.
[0007] in order to meet IEEE 802.3af standard, I
LIMValue must remain on a fixing horizontal in the 400mA-450mA scope, and I
CUTValue must remain on greater than P
Class/ V
PortBut less than the fixing horizontal of 400mA, wherein V
PortBe the output voltage of PSE, and P
ClassBe the power of appropriate level.As defined in the IEEE 802.3af standard, V
PortValue must be in the scope of 44V-57V.
[0008] PSE can comprise a plurality of ethernet ports, in order to transmit electricity to a plurality of ethernet devices that are connected to the corresponding port.Because many ethernet devices do not need by the Ethernet transmission of electricity, the PSE port that consideration may not be all will be connected to PD.Therefore, most of PSE are made into to make its power to multiply by port number much smaller than 15.4W.Therefore, PSE can carry out power division, to guarantee the power supply capacity of the required gross power of port less than PSE.
[0009] as following illustrated, the current limit threshold of fixing horizontal causes powering to port still less.For example, under the output voltage of 57V, the I of 350mA level
CUTExpression overload breaker of electronic circuit disconnects at 57V * 350mA=19.95 W.I in 57V output voltage and 400mA level
CUTDown, the overload circuit circuit breaker can disconnect at 57V * 400mA=22.8W.Because the overload breaker of electronic circuit only just can disconnect when power output reaches described level, the PSE power distribution system may suppose that each described port all can extract the power of described amount, surpasses the maximum power of IEEE 802.3af standard-required.
[0010] therefore, if at least one port requires high-output power, PSE (it has limited power supply capacity) may be for reducing the port power supply of quantity, because it may suppose that each port can extract high power.For example, has the PSE of 200W power supply, at Vport=57V and I
CUTUnder the condition for the 350mA level, can only be for 10 port power supplies, because it may suppose that each port can consume the power up to 19.95W.If power output is limited in 15.4W, identical PSE can be 13 port power supplies of 200W/15.4W ≈.
[0011] therefore, need be used to regulate the mechanism of current limit threshold level, so that PSE can carry the electric power of maximum, be the port power supply of maximum quantity simultaneously.
[0012] in addition, the input current limit threshold of IEEE 802.3af standard code PD.Specifically, standard is with the input inrush current I among the PD
InrushBeing limited in maximum is 400mA.But, it is desirable to make the input current limit threshold to regulate, so that PD can receive higher power.
Summary of the invention
[0013] the invention provides a kind of novel circuit and method, be used to regulate the current limit threshold level of electric power system, described electric power system is powered to power consumption equipment (PD) by communication link.
[0014] according to an aspect of the present invention, described electric power system has current-limiting circuit, is used for according to current limit threshold restriction electric current; And threshold circuit, be used for setting current limit threshold according to the output parameter of described system.Specifically, can limit the output current of described electric power system and/or can limit the input current of described PD according to the output current limiting threshold value according to the input current limit threshold.Described threshold circuit can be according to the output voltage control output current limiting threshold value and/or the input current limit threshold of described system, so that obtain the constant power output of the cardinal principle of described system.
[0015] for example, described threshold circuit can be according to the maximum output current of output voltage initialization system under short-circuit condition and/or the overload current detection range of system of system.In addition, described threshold circuit can be set the maximum input current of PD according to the output voltage of system.
[0016] according to embodiments of the invention, described current limit threshold can be inversely proportional to output voltage, with the constant output of acquisition system, and no matter output voltage.
[0017] in addition, described threshold circuit can utilize the constant output of the approximate representation system of current-voltage curve to set current limit threshold.For example, the linear approximation of current-voltage curve can be used to make current limit threshold and output voltage linear ratio in the preset range of system's output voltage.
[0018] the output field effect transistor or the bipolar transistor of current-limiting circuit may command system are in case the output current of locking system surpasses the maximum output current of system under short-circuit condition.
[0019] in addition, when the time that the output current of system surpasses the overload current detection range exceeded pre-specified time, described current-limiting circuit can make the output transistor of system close.
[0020] the method according to this invention, implement following steps:
-determine power supply unit output parameter and
-regulate current limit threshold according to described definite output parameter.
[0021] specifically, can regulate the maximum output current of described power supply unit under short-circuit condition and/or the maximum overload electric current of described power supply unit according to the output voltage of power supply unit, so that obtain the substantially invariable power output of described power supply unit.In addition, can regulate the maximum input current of PD according to the output voltage of power supply unit, so that obtain the substantially invariable power output of described power supply unit.
[0022] according to a further aspect in the invention, the system by Power over Ethernet comprises that having at least one port is used for to the PSE of power consumption equipment (PD) power supply with according to the threshold circuit of controlling current limit threshold at the output voltage of port generation.Specifically, the output current limiting threshold value of PSE and/or the input current limit threshold of PD can be controlled according to output voltage, so that obtain the substantially invariable power output of PSE.
[0023] according to another aspect of the present invention, local area network (LAN) comprises at least one pair of network node, hub and be used for network node is connected to hub so that the telecommunication cable of data communication to be provided.Hub has power supply unit, is used for powering to the load by telecommunication cable.Network comprises current-limiting circuit, is used for the electric current according to the system of current limit threshold restricted passage telecommunication cable power supply; And threshold circuit, be used for setting current limit threshold according to the output parameter of power supply unit.Described threshold circuit can be set the output current limiting threshold value of power supply unit and/or the input current limit threshold of load according to the output parameter of power supply unit.
[0024] by following detailed description, those skilled in the art can understand other advantages of the present invention and aspect more easily, wherein only implement the form of best mode of the present invention by explanation, illustrate and disclosed embodiments of the invention.As what will disclose, the present invention can implement with other and different embodiment, and its some details can improve in various conspicuous modes, and all such improvement do not depart from design of the present invention.Therefore, accompanying drawing and explanation are considered to be illustrative, rather than restrictive.
Description of drawings
[0025] following detailed description to the embodiment of the invention is by accessing best understanding in conjunction with the following drawings, and wherein feature is not necessarily drawn in proportion, but draws with the form that the best illustrates associated components, wherein:
[0026] Fig. 1 illustrates the block diagram of the multiport PSE in the PoE of the present invention system.
[0027] Fig. 2 illustrates the schematic diagram of current limit threshold controlling organization of the present invention.
[0028] Fig. 3 illustrates the schematic diagram of current-voltage curve, and the power output of expression substantially constant level is transported to the port of PSE.
Embodiment
[0029] the present invention will utilize the example of the value of regulating current limit threshold, in Power over Ethernet (PoE) system, and the maximum output current (I of PSE under short-circuit condition
LIM), and/or overload current detection range (I
CUT) realize.But, apparent, the disclosed design of this paper can be applicable to any network.For example, system of the present invention can be used on 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.Hub can comprise power supply unit, and telecommunication cable can be used to power to the load from power supply unit.
[0030] in addition, as what one skilled in the art will realize that, design of the present invention can be used to regulating load, as the maximum input current value of PD.
[0031] Fig. 1 illustrates simplified block diagram, Power over Ethernet (PoE) system 10 is shown comprises power supply unit (PSE) 12, have a plurality of port ones-4 respectively the link by separately can be connected to power consumption equipment (PD) 1-4, each link can provide with 2 or 4 groups of twisted-pair feeders in the Ethernet cable.Although Fig. 1 illustrates four ports of PSE 12, those of skill in the art will recognize that the port that any amount can be provided.
[0032] PSE 12 can interact according to IEEE 802.3af standard and each PD.Specifically, PSE 12 and PD participate in the PD trace routine, and during this program, PSE 12 detects link to detect PD.If detect PD, PSE 12 checks the PD detection signals, is effectively or invalid to determine it.Effective and invalid detection signal has definition in IEEE 802.3af 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.
[0033] if signal is effective, PD can select to present graded signal to PSE, can extract how much electric power when powering on to be illustrated in.PD can be divided into rank 0 to 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.Really define the level not according to PD, PSE provides required power to PD.
[0034] the multiport PSE equipment to the multilink power supply uses single power supply usually, is the power supply that meets 802.3 af with AC line power source conversion, and it can transmit by link.Because a plurality of ethernet devices that are connected to the PSE port do not need by the Ethernet transmission of electricity, can think may not be all the PSE port all be required power supply.Therefore, common PSE equipment is made with power supply capacity and multiply by port number much smaller than 15.4W.Therefore, between link, may there be the competition of electric power by the PSE power supply.For example, if one 4 port PSE equipment is powered to the PD of 3 ranks 2, it must distribute 21W to be used for to corresponding 3 links power supply.If PSE equipment detects PD at its last port, it must guarantee that it has the ability of powering for that PD.For example, if PSE equipment with the power work of 25W, it has only 4W residue.Therefore, it can not be the PD power supply of the 4th rank 2.But, the PSE equipment with 30W power supply can be powered for the PD of the 4th rank 2, because it has the residue of 9W.
[0035] this way of example shows, multiport PSE must remember the electricity needs from link, before the link power supply electricity needs and its power supply capacity are being made comparisons.Therefore, provide the PSE12 with power supply management mechanism, it carries out power division, to guarantee the power supply capacity of the required gross power of port less than PSE.
[0036] in addition, IEEE 802.3 af standard-required PSE can bear that any electric wire in the feed cable is taken office the short circuit of his electric wire what and not impaired, if be no more than electric current I by the current strength of described short circuit
LIM, I wherein
LIMBe meant the maximum output current of PSE under short-circuit condition.
[0037] in addition, IEEE 802.3 af standard-requireds are when detecting overload, and PSE is from the power interface deenergization.Specifically, the output current as PSE surpasses electric current I
CUTThe time of (being meant the overload current detection range) exceeds preset time at interval, as overload time limit (T
Ovld) time, can detect overload.
[0038] meets among the PSE of IEEE 802.3af I in routine
LIMValue must remain on the fixing horizontal in the 400mA-450mA scope, and I
CUTValue must remain on greater than P
Class/ V
Port, but less than the fixing horizontal of 400mA, wherein V
PortBe the output voltage of PSE port, and P
ClassBe the power of appropriate level.As defined in the IEEE 802.3af standard, V
PortValue must be in the 44V-57V scope.
[0039] therefore, the PSE that meets IEEE 802.3af usually can guarantee to have under the output voltage in the 44V-57V scope power output of 15.4W.Therefore, its overload current detection range I
CUTCan be between 15.4W/44V and 400mA, promptly between 350mA-400mA.Correspondingly, conventional usually PSE is designed to have the overload breaker of electronic circuit, can surpass the I of 375 ± 25mA at output current
CUTDeenergization during level.
[0040] but, the current limit threshold of fixing horizontal restriction PSE powers to port still less.For example, under the 57V output voltage, the I of 350mA level
CUTExpression overload breaker of electronic circuit disconnects at 57V * 350mA=19.95 W.I in 57V output voltage and 400mA level
CUTDown, the overload circuit circuit breaker can disconnect at 57V * 400mA=22.8W.Because the overload breaker of electronic circuit only just disconnects when power output reaches above-mentioned level, the power distribution system of PSE may suppose that above-mentioned each port can extract the power of described amount, surpasses the maximum power of IEEE 802.3af standard-required.
[0041] therefore, if at least one port requires high-output power, the PSE with limited power supply capacity can be to the port power supply that reduces quantity, because it may suppose that each port can extract high power.For example, has the horizontal I of 200W power supply and 350mA
CUTPSE can only be to the power supply of 10 ports, because it may suppose that each port will consume up to 19.95W.If power output is restricted to 15.4W, then identical PSE can be to 13 port power supplies of 200W/15.4W ≈.
[0042] provide the power of maximum for the port to maximum quantity, PSE 12 of the present invention has the current limit threshold controlling organization, and it is according to output voltage V
PortThe control current limit threshold is so that obtain almost constant power output in the output voltage of preset range.
[0043] referring to Fig. 2, current limit threshold controlling organization 20 of the present invention comprises threshold value control circuit 22, is used for according to output voltage V
PortSet current limit threshold and current-limiting circuit 24, it, responds as short-circuit condition and overload to the overcurrent incident according to the current limit threshold of being set by threshold value control circuit.Specifically, the output current of current-limiting circuit 24 monitoring PSE 12 is to remain on I with electric current
LIMOr be lower than I
LIMIn addition, current-limiting circuit 22 expressions surpass I when the output current of PSE 12
CUTTime exceeded preset time at interval, make PSE 12 can disconnect power supply to PD.Each port that can be PSE 12 provides threshold value control circuit 22 and current-limiting circuit 24 on the PSE chip.
[0044] specifically, threshold value control circuit 22 can utilize the output voltage monitoring terminal OUT of corresponding port to monitor output voltage V port.Described OUT terminal can be connected to port by resistance R out.According to the determined value of Vport, threshold value control circuit 22 is with current limit threshold I
TBe made as the function of Vport value.Specifically, current limit threshold I
TCan be the maximum current I under short-circuit condition
LIM, or overload current detection range I
CUT
[0045] for example, threshold value control circuit 22 can make current limit threshold I
TPort is inversely proportional to output voltage V, i.e. I
T=P
T/ V
Port, P wherein
TIt is the threshold power level when detecting the overcurrent incident.Because power output Pport=I
T* Vport=P
T, current-limiting circuit 24 meetings detect the overcurrent incident under the power output Pport of the steady state value of PSE 12.As a result, PSE 12 can not rely on the variation of output voltage V port and produce the power output Pport of constant level substantially.Those of skill in the art will recognize that and to use different analog or digital circuit to produce the current limit threshold I that is inversely proportional to output voltage V port
TIn addition, can programme, to realize this function to computer equipment.
[0046] in addition, the power output Pport that threshold value control circuit 22 can utilize linearity or other approximate current-voltage (I-V) curve representation constant levels sets current limit threshold I
TValue.For example, referring to Fig. 3, in the limited preset range of output voltage Δ V, the constant power level Pport of I-V curve representation can be a linear approximation.Δ V scope can corresponding IEEE 802.3af standard-required the 44V-57V scope in output voltage V port.Therefore, in the preset range Δ V of output voltage V port, threshold value control circuit 22 can be realized the I-V curve of linear approximation, and the power output Pport of expression constant level is so that current limit threshold I
TWith the linear ratio of output voltage V port.As a result, in the preset range of output voltage V port, can obtain the Pport of constant level substantially.
[0047] can be by the output transistor of control PSE, for example, the gate drive voltage by the terminal GATE that utilizes corresponding corresponding port controls external power source MOSFET 26 provides the electric power conveying to the port of PSE12.For example, MOSFET 26 can be in a controlled manner be connected to the PSE port with-48V input power supply, so that enough power P port to be provided.Current-limiting circuit 24 by the voltage Vsense at monitoring inductive reactance Rsense (Rsense is connected to MOSFET 26) two ends, is come the output current of monitoring port by the terminal SENSE of corresponding corresponding port.
[0048] threshold value control circuit 22 provides threshold voltage V to current-limiting circuit 24
LIM, it can be according to the I that is determined by threshold value control circuit 22
LIMValue is defined as I
LIM* R
SAs mentioned above, I
LIMValue is determined according to output voltage V port.Current-limiting circuit 24 can be controlled the gate voltage of MOSFET 26, to surpass threshold voltage V as the voltage Vsense that monitors
LIMThe time reduce the output current of PSE.For example, current-limiting circuit 24 may comprise operational amplifier, and it is with threshold voltage V
LIMVsense makes comparisons with induced voltage, and to produce output voltage, described output voltage surpasses threshold voltage V at voltage Vsense
LIMThe time, the gate voltage of reduction MOSFET 26.As a result, the output current of PSE 12 remains on I
LIMLevel or be lower than I
LIMLevel.
[0049] in addition, threshold value control circuit 22 can provide threshold voltage V to current-limiting circuit 24
CUT, described threshold voltage can be according to the I that is determined by threshold value control circuit 22
CUTValue is defined as I
CUT* R
SAs mentioned above, I
CUTValue is determined according to output voltage V port.When the voltage Vsense that monitors surpasses threshold voltage V
CUTTime when exceeding predetermined time interval, current-limiting circuit 24 can be made indication, so that from the port deenergization.Specifically, current-limiting circuit 24 can surpass threshold voltage V at induced voltage Vsense
CUTThe time activate the overload timer.If induced voltage Vsense still is higher than V when the overload time limit by the timer regulation expires
CUTLevel is then closed MOSFET26, with from the port deenergization.For example, the overload time limit can be in the 50ms-75ms scope, to meet IEEE 802.3af standard.
[0050] therefore, current limit threshold controlling organization of the present invention is regulated I according to output voltage V port
LIMAnd/or I
CUTThreshold value provides the power output Pport of constant level substantially with the variation that does not rely on output voltage V port.As a result, the power delivery of maximum can be arrived the PSE port of maximum quantity.
[0051] in addition, IEEE 802.3af standard is with the input inrush current I of PD
InrushBe limited to and be 400mA to the maximum.Except the output current limiting threshold value of control PSE, or replace control output current limiting threshold value, current limit threshold controlling organization of the present invention can be used to regulate according to the output voltage of PSE the input current limit threshold of PD.
[0052] for example, PD 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.Described input current threshold value can be according to the output voltage of PSE, regulates in the mode of the output current limiting threshold value that is similar to above-mentioned adjusting PSE.Specifically, when power that PD has relatively high expectations, PD can be with higher input current work.
[0053] above interpretation and disclosed various aspects of the present invention.In addition, content shown and that disclose only is a preferred embodiment, but just 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
CUTOutside the threshold value, current limit threshold controlling organization of the present invention can be regulated other threshold levels of PSE and/or PD according to the output signal of PSE.
[0054] the foregoing description also can be used for explaining and becomes known for implementing best mode of the present invention, and make that those skilled in the art can be with the form utilization of above-mentioned or other embodiment, and carry out various improvement according to the requirement of concrete application of the present invention or purposes.
[0055] 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 other embodiment.
Claims (31)
1. one kind by the system of communication link to power consumption equipment (PD) power supply, comprising:
Current-limiting circuit, be used for according to current limit threshold restriction electric current and
Threshold circuit is used for setting described current limit threshold according to the output parameter of electric power system.
2. system according to claim 1, wherein, described current-limiting circuit is set to the output current according to described current limit threshold restriction electric power system.
3. system according to claim 1, wherein, described current-limiting circuit is set to limit according to described current limit threshold the input current of described power consumption equipment.
4. system according to claim 2, wherein, described threshold circuit is set to the maximum output current of output parameter initialization system under short-circuit condition according to system.
5. system according to claim 2, wherein, described threshold circuit is set to the overload current detection range according to the output parameter initialization system of described system.
6. system according to claim 2, wherein, described threshold circuit is set to control described current limit threshold according to the output voltage of described system, so that the constant substantially power output of acquisition system.
7. system according to claim 6, wherein, described threshold circuit is set to according to the maximum output current of described output voltage control system under short-circuit condition.
8. system according to claim 6, wherein, described threshold circuit is set to the overload current detection range according to described output voltage control system.
9. system according to claim 6, wherein, described threshold circuit is set to make described current limit threshold and output voltage to be inversely proportional to.
10. system according to claim 6, wherein, described threshold circuit is set to utilize approximate current-voltage curve to represent the constant power output of cardinal principle of system, sets current limit threshold.
11. system according to claim 10, wherein, described threshold circuit is set to utilize the current-voltage curve of linear approximation in the preset range of system's output voltage.
12. system according to claim 4, wherein, described current-limiting circuit is set for the output transistor of control system, in case output current surpasses the maximum output current of system under short-circuit condition.
13. system according to claim 5, wherein, described current-limiting circuit is set for when the time that output current surpasses the overload current detection range and exceeds when predetermined in limited time the output transistor of shutdown system.
14. by communication link by power supply unit in the system of PD power supply, a kind of control method may further comprise the steps:
Determine power supply unit output parameter and
Regulate current limit threshold according to determined output parameter.
15. method according to claim 14, wherein, described regulating step comprises the output current limiting threshold value of regulating described power supply unit.
16. method according to claim 14, wherein, described regulating step comprises the input current limit threshold of regulating described PD.
17. method according to claim 15, wherein, the maximum output current of described power supply unit under short-circuit condition regulated according to the output parameter of described power supply unit.
18. method according to claim 15, wherein, the maximum overload electric current of described power supply unit is regulated according to the output parameter of described power supply unit.
19. method according to claim 15, wherein, described current limit threshold is regulated according to the output voltage of power supply unit, so that obtain the constant substantially power output of described power supply unit.
20. method according to claim 19, wherein, described current limit threshold and described output voltage are inversely proportional to.
21. method according to claim 19, wherein, the approximate current-voltage curve of described current limit threshold utilization represent power supply unit substantially constant power output control.
22. method according to claim 21, wherein, described current limit threshold utilization is controlled at the approximate current-voltage curve of the preset range internal linear of power supply unit output voltage.
23. the system by Power over Ethernet comprises:
Power supply unit (PSE), have at least one port be used for to power consumption equipment (PD) power supply and
Threshold circuit is used for according to the output voltage control current limit threshold that produces at described port.
24. system according to claim 23, wherein, described threshold circuit is set for the output current limiting threshold value of control PSE.
25. system according to claim 23, wherein, described threshold circuit is set for the input current threshold value of control PD.
26. system according to claim 24, wherein, described threshold circuit is set to the output current limiting threshold value according to described output voltage control PSE, so that obtain the constant power output of cardinal principle of PSE.
27. system according to claim 26, wherein, described threshold circuit is set to the maximum output current under short-circuit condition according to described output voltage control PSE.
28. system according to claim 26, wherein, described threshold circuit is set to the overload current detection range according to described output voltage control PSE.
29. 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, be used for powering to the load by telecommunication cable, described network comprises current-limiting circuit, is used for the electric current according to the system of current limit threshold restricted passage telecommunication cable power supply, and threshold circuit, be used for setting current limit threshold according to the output parameter of power supply unit.
30. network according to claim 29, wherein, described threshold circuit is set for the output current limiting threshold value of setting power supply unit according to the output parameter of power supply unit.
31. network according to claim 29, wherein, described threshold circuit is set for the input current limit threshold of setting described load according to the output parameter of power supply unit.
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| US11/252,547 | 2005-10-19 | ||
| US11/252,547 US20060164773A1 (en) | 2005-01-25 | 2005-10-19 | Adjusting current limit thresholds based on output voltage of power supply device in system for providing power over communication link |
| PCT/US2006/001193 WO2006081078A2 (en) | 2005-01-25 | 2006-01-13 | Adjusting current limit thresholds based on output voltage of power supply device in system for providing power over communication link |
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| 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 |
| CN200680005472.XA Active CN101124775B (en) | 2005-01-25 | 2006-01-09 | Dual-mode detection of powered device in power over Ethernet system |
| CNA2006800054630A Pending CN101124771A (en) | 2005-01-25 | 2006-01-09 | Power sourcing equipment having auto-zero circuit for determining and controlling output current |
| CN200680003200.6A Active CN101116285B (en) | 2005-01-25 | 2006-01-13 | System, method and regional network with electricity provided by communication link |
| 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 |
| 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 |
| 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 |
| 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 |
| CNA2006800093438A Pending CN101147356A (en) | 2005-01-25 | 2006-01-24 | Supplying power over four pairs of conductors in communication cable |
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| 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 |
| CN200680005472.XA Active CN101124775B (en) | 2005-01-25 | 2006-01-09 | Dual-mode detection of powered device in power over Ethernet system |
| 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 |
| 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 |
| 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 |
| 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 |
| CNA2006800093438A Pending CN101147356A (en) | 2005-01-25 | 2006-01-24 | Supplying power over four pairs of conductors in communication cable |
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| CN109962607A (en) * | 2017-12-26 | 2019-07-02 | 维谛公司 | A kind of Current limited Control adjusting method and device |
| CN109962607B (en) * | 2017-12-26 | 2020-10-02 | 维谛公司 | Current limiting control adjusting method and device |
| TWI801088B (en) * | 2021-11-02 | 2023-05-01 | 瑞昱半導體股份有限公司 | Power supply apparatus and method having power limitation mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101124771A (en) | 2008-02-13 |
| CN101112043A (en) | 2008-01-23 |
| CN101147356A (en) | 2008-03-19 |
| CN101147357A (en) | 2008-03-19 |
| CN101124775A (en) | 2008-02-13 |
| CN101112043B (en) | 2010-10-13 |
| CN101112042A (en) | 2008-01-23 |
| CN101147355A (en) | 2008-03-19 |
| CN101147355B (en) | 2011-05-18 |
| CN101112042B (en) | 2012-01-04 |
| CN101124773A (en) | 2008-02-13 |
| CN101116285B (en) | 2015-06-17 |
| CN101156355A (en) | 2008-04-02 |
| CN101124775B (en) | 2014-11-26 |
| CN101124772B (en) | 2012-09-19 |
| CN101124772A (en) | 2008-02-13 |
| CN101147357B (en) | 2010-10-13 |
| CN101156355B (en) | 2011-05-25 |
| CN101124774A (en) | 2008-02-13 |
| CN101129019A (en) | 2008-02-20 |
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