CN101124771A - Power sourcing equipment having auto-zero circuit for determining and controlling output current - Google Patents
Power sourcing equipment having auto-zero circuit for determining and controlling output current Download PDFInfo
- Publication number
- CN101124771A CN101124771A CNA2006800054630A CN200680005463A CN101124771A CN 101124771 A CN101124771 A CN 101124771A CN A2006800054630 A CNA2006800054630 A CN A2006800054630A CN 200680005463 A CN200680005463 A CN 200680005463A CN 101124771 A CN101124771 A CN 101124771A
- Authority
- CN
- China
- Prior art keywords
- pse
- current
- output current
- output
- automatic zero
- 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.)
- Pending
Links
Images
Classifications
-
- 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
Landscapes
- Small-Scale Networks (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Dc Digital Transmission (AREA)
- Measurement Of Current Or Voltage (AREA)
- Tests Of Electronic Circuits (AREA)
- Emergency Protection Circuit Devices (AREA)
- Power Sources (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 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
[0001] the present invention relates to electric power system, more particularly, relate to the circuit and the method that are used for determining and controlling the output current of Power over Ethernet (PoE) system's power supply unit (PSE).
Background technology
[0002] in the past in the several years, Ethernet has become the most frequently used method of LAN.802.3 groups of IEEE, 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 been eliminated needs extra socket 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 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.
[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 can select to present graded signal to PSE, and how much electric power it can extract when powering on to be illustrated in.PD can be divided into 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.
[0006] when PD powers, IEEE 802.3af standard-required PSE passes through its output current of monitoring with respect to certain current limit threshold, for example maximum output current (the I of PSE under short-circuit condition
LIM) and overload current detection range (I
CUT), check overcurrent condition.Specifically, PSE should bear that any lead in the service cable is taken office the short circuit of his lead what and not impaired, 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 (T that is set in the 50ms-75ms scope
Ovld) time, can detect overload.In order to meet IEEE 802.3af standard, I
LIMValue must remain in the scope of 400mA-450mA and I
CUTValue must remain on greater than 15.4W/V
Port, but less than the level of 400mA, wherein V
PortIt is the output voltage of PSE.
[0007] in addition, IEEE 802.3af standard-required PSE checks the undercurrent state, extracts the minimum prescribed electric current to guarantee PD.Specifically, according to Maintain Power Signature (MPS) (maintenance electric power signal) requirement, PSE can monitor its output current, is lower than IDLE state current (I with convenient output current
Min) time greater than the MPS (T that reverses the time limit
MPDO) time, cut off the electricity supply from port.IEEE 802.3af standard-required I
MinValue in the 5mA-10mA scope.
[0008] therefore, require PSE to measure its output current, when output current surpasses current limit threshold, overcurrent condition is responded, and when output current is lower than certain minimum value, the undercurrent state is responded.Usually, PSE measures its output current by the sensing voltage of determining the sensing resistor two ends.
[0009], wishes to make sensing resistor as much as possible little, if particularly electric current has wide dynamic range owing to heat or voltage margin.For example, can use the resistance of 0.5 Ω to meet IEEE 802.3af standard.Because the sensing resistor value is low, be used to the conventional differential amplifier measuring sensing voltage and corresponding electric current and required threshold level are made comparisons, possible owing to the bias voltage relevant with amplifier circuit causes appreciable error.For example, bias voltage may pass through dynamic condition, as heat, and light and radiation condition, by the difference of input stage transistor size, by the difference of described transistorized doping and base diffusion, and other circuit defects and causing.Because described bias voltage, differential amplifier may produce certain signal in its output, even identical when being applied to its voltage of importing.
[0010] therefore, be desirable to provide the PSE with current measurement circuit, the bias voltage of its meeting compensated amplifier circuit produces corrected value with the output at amplifier.
Summary of the invention
[0011] the application provides a kind of novel system and method, is used for the output according to current limit threshold control PSE.According to an aspect of the present invention, PSE comprises the automatic zero set circuit, is used for monitoring output current and the current limit threshold of PSE are made comparisons, with the output of control PSE.Described automatic zero set circuit can comprise automatic zero set comparator or auto-zeroed amplifiers.
[0012] for example, described auto-zeroed amplifiers can be made comparisons the output current and the PSE of monitoring at the maximum output current under the short-circuit condition, with the control output current, thereby prevents that it from surpassing the maximum output current of PSE under short-circuit condition.
[0013] in addition, described automatic zero set comparator can be made comparisons the output current and the overload current detection range of monitoring, cuts off the power supply from the output of PSE when exceeding first predetermined time interval with the time that surpasses the overload current detection range at output current.
[0014] in addition, described automatic zero set comparator can be set for makes comparisons the output current and the predetermined minimum current of monitoring, and the output from PSE when exceeding second predetermined time interval with the time that is lower than predetermined minimum current at output current is cut off the power supply.
[0015] according to one embodiment of present invention, described automatic zero set circuit can be set up the sensing voltage by the sensing resistor two ends of monitoring PSE, monitors the output current of PSE.Described automatic zero set circuit can be made comparisons the sensing voltage and the reference voltage of expression current limit threshold.
[0016] can provide control circuit, be used for optionally providing first reference signal of expression overload current detection range, or second reference signal of the predetermined minimum current of expression is provided for the input of automatic zero set comparator.
[0017] described control circuit can be monitored the output of described automatic zero set comparator, is used to determine when that sensing voltage surpasses first reference signal, and when sensing voltage becomes is lower than second reference signal.
[0018] when sensing voltage surpassed first reference signal, described control circuit can activate first timing device, if sensing voltage surpasses first reference signal after first predetermined time interval that is defined by first timing device, from the output outage of PSE.
[0019] in addition, when sensing voltage during less than second reference signal, described control circuit can activate second timing device, if sensing voltage is less than second reference signal after second predetermined time interval that is defined by second timing device, from the output outage of PSE.
[0020] the method according to this invention has been implemented following steps, to control the output of PSE:
-monitoring PSE output current and
-provide the output valve of representing output current to an input of automatic zero set circuit, be used for comparing with the current limit threshold that offers another input of auto-zeroed amplifiers.
[0021] according to a further aspect in the invention, the PoE system comprises the control circuit that is used for the PSE that powers to power consumption equipment (PD) and is used for controlling according to predetermined current threshold level the output of PSE.Described control circuit comprises the automatic zero set circuit, is used for output current and the predetermined current threshold level of PSE are made comparisons.
[0022] 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 disclosed, 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 spirit of the present invention.Therefore, drawing and description are regarded as illustrative, rather than restrictive.
Description of drawings
[0023] 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 form that can the best illustrated correlated characteristic, wherein:
Fig. 1 is a block diagram, and PSE of the present invention is shown;
Fig. 2 is a schematic diagram, and the automatic zero set comparator is shown, and is used for comparison output current and current limit threshold, according to the output outage of comparative result from PSE;
Fig. 3 is a schematic diagram, and auto-zeroed amplifiers is shown, and is used to control the output current of PSE, surpasses current limit threshold so that prevent output current.
Embodiment
[0024] the present invention will utilize the automatic zero set circuit, and the output current of monitoring PSE is with respect to the maximum output current (I of PSE under short-circuit condition
LIM), overload current detection range (I
CUT) and Power over Ethernet (PoE) system in IDLE state current (I
Min) describe for example.But, apparent, the disclosed design of this paper is applicable to any output signal of monitoring with respect to the PSE of any value.
[0025] Fig. 1 illustrates simplified block diagram, Power over Ethernet (PoE) system 10 is shown, it comprises the power supply unit (PSE) 12 with a plurality of port ones-4, can be connected to power consumption equipment (PD) 1-4 by link separately, and described link utilizes the interior 2 or 4 groups of twisted-pair feeders of Ethernet cable to provide separately.Although Fig. 1 shows four ports of PSE 12, those of skill in the art will recognize that the port that can have any amount.
[0026] PSE 12 can interact according to IEEE 802.3af standard and each PD.Specifically, PSE 12 and PD participate in the PD testing process, and during this period, 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.
[0027] if described signal is effective, PD can select to present graded signal to PSE, can extract how many electric energy when powering on to be illustrated in.PD can be divided into 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.
[0028] when PD powers, PSE 12 passes through its output current of monitoring with respect to certain current limit threshold, for example maximum output current (the I of PSE under short-circuit condition
LIM), overload current detection range (I
CUT) and IDLE state current (I
Min), check overcurrent and undercurrent state.
[0029] specifically, PSE 12 should bear that any lead that is applied in the service cable is taken office the short circuit of his lead what and not impaired, if be no more than I by the current strength of described short circuit
LIMTherefore, PSE12 can monitor its output current, surpasses I to prevent it
LIMLevel.I
LIMValue remain in the scope of 400mA-450mA.
[0030] in addition, the output current as PSE 12 surpasses I
CUTTime exceed the overload time limit (T that is set in the 50ms-75ms scope
Ovld) time, can detect overload.I
CUTValue remain on greater than 15.4W/V
Port, but less than the level of 400mA, wherein V
PortIt is the output voltage of PSE.
[0031] in addition, extract minimum at least given electric current in order to ensure PD, if the output current of PSE 12 is lower than IDLE state current (I
Min) time greater than the MPS (T that reverses the time limit
MPDO) time, can detect the undercurrent state.I
MinValue remain in the scope of 5mA-10mA.
[0032] therefore, PSE 12 can measure its output current, to reach I at output current
LIMLevel and/or surpass I
CUTRespond overcurrent condition during level, and be lower than I at output current
MinThe not enough state of response current during level.As what discuss in more detail below, PSE measures its output current by the sensing voltage of determining the sensing resistor two ends.
[0033], wishes to make sensing resistor as much as possible little, if particularly electric current has wide dynamic range owing to heat or voltage margin.For example, can use the resistance of 0.5 Ω to meet IEEE 802.3af standard.Because the sensing resistor value is low, be used to the conventional differential amplifier measuring sensing voltage and corresponding electric current and required threshold level are made comparisons, possible owing to the bias voltage relevant with amplifier circuit causes appreciable error.For example, bias voltage can pass through dynamic condition, as heat, and light and radiation condition, by the difference of input stage transistor size, by the difference of described transistorized doping and base diffusion, and other circuit defects and causing.Because described bias voltage, differential amplifier can produce certain signal in its output, is identical even be applied to the voltage of its input.
[0034] for the accurate measurement of sensing voltage that little value sensing resistor two ends are provided, PSE 12 of the present invention comprises the automatic zero set circuit, is used to monitor sensing voltage, and it and reservation threshold level are compared.The automatic zero set circuit is usually with each clock cycle two-phase work.First mutually in, it makes its input short circuit together, and in the resulting biasing of internal reservoir.Second mutually in, it exports its differential input signal, simultaneously described input offset error is by the bias compensation that stores.As described below, the automatic zero set circuit can be automatic zero set comparator or auto-zeroed amplifiers.
[0035] Fig. 2 illustrates exemplary circuit 20, is used for cutting off the power supply from the output port of PSE 12 responding overload and/or undercurrent state.Can provide by the gate drive voltage of terminal Gate (gate pole) power controlling MOSFET 22 from PSE 12 and carry to the electric power of PD.For example, MOSFET22 can be in a controlled manner be connected to-48V input power supply the PSE output port, satisfies the power requirement of PD.The output current of PSE 12 is measured by the voltage Vsense that terminal Sense (sensing) monitoring is connected to the sensing resistor Rsense two ends of MOSFET 22.As mentioned above, wish to make sensing resistor Rsense as far as possible little.For example, can use the resistance of 0.5 Ω to meet IEEE 802.3af standard.Can provide MOSFET 22 for each port one-4 of PSE 12, sensing resistor Rsense and terminal Gate and Sense.
[0036] the Sense terminal is connected to first input of automatic zero set comparator 24, so that the detected value of sensing voltage Vsense to be provided to automatic zero set comparator 24.The reference voltage of the selected current limit threshold of correspondence is offered second input of automatic zero set comparator 24.For example, automatic zero set comparator 24 can be with sensing voltage Vsense and voltage V
CUT=I
CUT* Rsense or and voltage V
Min=I
Min* Rsense makes comparisons, and wherein Rsense is the resistance value of sensing resistor Rsense.Switch 26 can be provided, be used for importing to second of automatic zero set comparator 24 selectively providing from the first reference voltage source V
ReflV
CUTVoltage, or provide from the second reference voltage source V
Ref2V
MinVoltage.
[0037] automatic zero set comparator 24 is made comparisons sensing voltage Vsense and selected reference voltage, produce output digital signal when surpassing selected reference voltage at sensing voltage, and generation has the output digital signal of second value when sensing voltage is lower than selected reference voltage level with first value.For example, surpass corresponding overload current detection range I as sensing voltage Vsense
CUTV
CUTDuring voltage, automatic zero set comparator 24 can produce logical one in its output, and works as sensing voltage Vsense less than corresponding IDLE state current I
MinV
MinDuring voltage, automatic zero set comparator 24 can produce logical zero in its output.Those of skill in the art will recognize that any execution automatic zero set program is used to eliminate the comparator device of the biasing that is generated by the comparator circuit, can be used as automatic zero set comparator 24.
[0038] single automatic zero set comparator 24 can be shared by the port one-4 of PSE 12, with the output current of monitoring and control is provided by each port.In addition, can be each port independent automatic zero set comparator is provided.
[0039] operation of automatic zero set comparator 24 is by controller 26 controls, and this controller is with the mode control switch 26 of appointment, so that provide from the first reference voltage source V to second input of automatic zero set comparator 24
Ref1V
CUTVoltage and providing from the second reference voltage source V
Ref2V
MinVoltage.For example, controller 26 can control switch 26, is connected to the first reference voltage source V with the input with automatic zero set comparator 24
Ref1, so that successively will be from the output current and the overload current detection range I of each port one-4
CUTMake comparisons.Then, controller 26 can switch to the input of automatic zero set comparator 24 the second reference voltage source V
Ref2, so that successively will be from the output current and the IDLE state current I of each port one-4
MinMake comparisons.In addition, from the output current of first port can with overload current detection range I
CUTWith IDLE state current I
MinCompare.Then, from the output current of next port can with overload current detection range I
CUTWith IDLE state current I
MinDeng comparing.
[0040] simultaneously, controller 26 is analyzed the output of automatic zero set comparator 24, to determine that the output current from the corresponding port is to be higher than overload current detection range I
Cut, still be lower than IDLE state current I
MinSpecifically, second input of automatic zero set comparator 24 is switched to the first reference voltage source V when controller 26
ReflThe time, it may detect logical one in the output of automatic zero set comparator 24, shows that value at the sensing voltage Vsense of the first input end of automatic zero set comparator 24 is higher than the V at second input
CUTMagnitude of voltage.Here, controller 28 starts timer 30, and this timer is programmed to calculate corresponding overload time limit T
OvldValue.When the time interval by timer 30 countings expires, if sensing voltage Vsense still is higher than V
CUTVoltage, the controller 28 corresponding Gate terminal of can leaving behind is connected to the MOSFET 22 of this terminal with disconnection.
[0041] in addition, second input of automatic zero set comparator 24 is switched to the second reference voltage source V when controller 26
Ref2The time, it may detect logical zero at the output of automatic zero set comparator 24, shows that value at the sensing voltage Vsense of the first input end of automatic zero set comparator 24 is less than the V at second input
MinMagnitude of voltage.Here, controller 28 starts timers 32, and this timer is programmed to calculate the corresponding MPS time limit T that reverses
MPDOValue.When the time interval by timer 32 countings expires, if sensing voltage Vsense is still less than V
MinVoltage, the controller 28 corresponding Gate terminal of can leaving behind is connected to the MOSFET22 of this terminal with cut-out.
[0042] Fig. 3 illustrates the output current that is used to regulate PSE, with the exemplary circuit 40 that prevents short-circuit condition.Specifically, circuit 40 is regulated output current, surpasses the maximum output current I of PSE under short-circuit condition so that prevent it
LIM
[0043] as mentioned above, the output current of PSE can be measured by the voltage Vsense that terminal Sense monitoring is connected to the sensing resistor Rsense two ends of MOSFET 22.Auto-zeroed amplifiers 42 can be provided, be used for voltage Vsense and reference voltage source V
RefThe reference voltage that provides is made comparisons, with the gate voltage of control MOSFET 22.For example, described reference voltage can corresponding voltage V
LIM=I
LIM* Rsense.
[0044] voltage Vsense can be offered first of auto-zeroed amplifiers 42 and import, and with voltage V
LIMOffer its second input.The output of auto-zeroed amplifiers 42 can produce corresponding V
LIMAnd the voltage that differs between the Vsense.Vsense is increased near V along with the increase of output current when voltage
LIMThe time, the output of auto-zeroed amplifiers 42 responds by the voltage that reduces on MOSFET 22 gate poles.Voltage on reduction MOSFET 22 gate poles can cause the increase of MOSFET resistance, and the latter can reduce the output current of the corresponding port of PSE 12 conversely again.Those of skill in the art will recognize that the output signal by producing analog value all can be used as auto-zeroed amplifiers 42 to any auto-zeroed amplifiers device that the differential wave of input responds.
[0045] single auto-zeroed amplifiers 42 can be shared by the port one-4 of PSE 12, with the output current of monitoring and control is provided by each port.In addition, can provide independent auto-zeroed amplifiers for each port.
[0046] above 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 with sensing voltage and I
CUT, I
MinAnd/or I
LIMOutside threshold value was made comparisons, auto-zeroed amplifiers of the present invention can be made comparisons any output signal of PSE and any parameter of PSE or PD.
[0047] 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.
[0048] 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 (20)
1. the power supply unit (PSE) in the Power over Ethernet system comprising:
The threshold setting circuit, be used to set current limit threshold and
The automatic zero set circuit is used for the output current of the PSE of comparison current limit threshold and monitoring, with the output of control PSE.
2. PSE according to claim 1, wherein, described automatic zero set circuit comprises auto-zeroed amplifiers, is used for output current and PSE are made comparisons at the maximum output current under the short-circuit condition, surpasses the maximum output current of PSE under short-circuit condition to prevent described output current.
3. PSE according to claim 1, wherein, described automatic zero set circuit comprises the automatic zero set comparator, is used for comparison output current and overload current detection range, when exceeding first predetermined time interval, from the output outage of PSE with the time that surpasses the overload current detection range at output current.
4. PSE according to claim 1, wherein, described automatic zero set circuit comprises the automatic zero set comparator, is used for comparison output current and predetermined minimum current, when exceeding second predetermined time interval, from the output outage of PSE with the time that is lower than predetermined minimum current at output current.
5. PSE according to claim 1, wherein, described automatic zero set circuit is set up the sensing voltage by the sensing resistor two ends of monitoring PSE, monitors the output current of PSE.
6. PSE according to claim 5, wherein, described automatic zero set circuit is set for the reference voltage of comparison sensing voltage and expression current limit threshold.
7. PSE according to claim 3, wherein, described threshold setting circuit comprises control circuit, is used for optionally providing for the input of automatic zero set comparator first reference signal of expression overload current detection range, or second reference signal of the predetermined minimum current of expression is provided.
8. PSE according to claim 7, wherein, described control circuit is set for the output of monitoring automatic zero set comparator, surpasses first reference signal so that determine when the sensing signal of expression PSE output current, and when sensing signal becomes is lower than second reference signal.
9. PSE according to claim 8, wherein, described control circuit is set for when sensing signal surpasses first reference signal, start first timing device, if sensing signal surpasses first reference signal after first predetermined time interval that is defined by first timing device, from the output outage of PSE.
10. PSE according to claim 9, wherein, described control circuit is set for when sensing signal during less than second reference signal, start second timing device, if sensing signal is less than second reference signal after second predetermined time interval that is defined by second timing device, from the output outage of PSE.
11. a method of controlling PSE output may further comprise the steps:
The monitoring PSE output current and
An input to the automatic zero set circuit provides the output valve of representing output current, is used for comparing with the current limit threshold that offers another input of auto-zeroed amplifiers.
12. method according to claim 11, wherein, described output valve is represented the sensing voltage at the sensing resistor two ends of PSE.
13. method according to claim 11, wherein, described output current and the PSE maximum output current under short-circuit condition compares, and surpasses the maximum output current of PSE under short-circuit condition to prevent described output current.
14. method according to claim 11, wherein, described output current and overload current detection range compare, when the time that described output current surpasses the overload current detection range exceeds first predetermined time interval from the output outage of PSE.
15. method according to claim 11, wherein, described output current and predetermined minimum current compare, when the time that described output current is lower than predetermined minimum current exceeds second predetermined time interval from the output outage of PSE.
16. a PoE system comprises:
PSE, be used for to power consumption equipment (PD) power supply and
Control circuit is used for the output according to predetermined current threshold level control PSE,
Described control circuit comprises the automatic zero set circuit, is used for output current and the predetermined current threshold level of comparison PSE.
17. system according to claim 16, wherein, described automatic zero set circuit is set for the voltage drop at the sensing resistor two ends of the reference voltage of relatively representing the scheduled current level thresholds and PSE.
18. system according to claim 16, wherein, described automatic zero set circuit comprises auto-zeroed amplifiers, is used for comparison output current and the PSE maximum output current under short-circuit condition, surpasses the maximum output current of PSE under short-circuit condition to prevent described output current.
19. system according to claim 16, wherein, described automatic zero set circuit comprises the automatic zero set comparator, be used for comparison output current and overload current detection range, when the time that described output current surpasses the overload current detection range exceeds first predetermined time interval, from the output outage of PSE.
20. system according to claim 16, wherein, described automatic zero set circuit comprises the automatic zero set comparator, is used for comparison output current and predetermined minimum current, when the time that described output current is lower than predetermined minimum current exceeds second predetermined time interval, from the output outage of PSE.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US64650905P | 2005-01-25 | 2005-01-25 | |
| US60/646,509 | 2005-01-25 | ||
| US11/227,289 | 2005-09-16 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102205835A Division CN102394757A (en) | 2005-01-25 | 2006-01-09 | Power sourcing equipment having auto-zero circuit for determining and controlling output current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101124771A true CN101124771A (en) | 2008-02-13 |
Family
ID=39023514
Family Applications (13)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800054630A Pending CN101124771A (en) | 2005-01-25 | 2006-01-09 | Power sourcing equipment having auto-zero circuit for determining and controlling output current |
| CN2006800093495A Expired - Fee Related CN101147357B (en) | 2005-01-25 | 2006-01-09 | High-power foldback mechanism in system for providing power over communication link |
| CN2006800093508A Active CN101156355B (en) | 2005-01-25 | 2006-01-09 | Detecting legacy powered device in power over Ethernet system |
| 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 |
| 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 |
| 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 |
| CN200680003200.6A Active CN101116285B (en) | 2005-01-25 | 2006-01-13 | System, method and regional network with electricity provided by communication link |
| 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 |
| CNA2006800054715A Pending CN101124774A (en) | 2005-01-25 | 2006-01-19 | Power using delivery to power supply device between detection and classification mode |
| 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 |
Family Applications After (12)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800093495A Expired - Fee Related CN101147357B (en) | 2005-01-25 | 2006-01-09 | High-power foldback mechanism in system for providing power over communication link |
| CN2006800093508A Active CN101156355B (en) | 2005-01-25 | 2006-01-09 | Detecting legacy powered device in power over Ethernet system |
| 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 |
| 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 |
| 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 |
| CN200680003200.6A Active CN101116285B (en) | 2005-01-25 | 2006-01-13 | System, method and regional network with electricity provided by communication link |
| 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 |
| CNA2006800054715A Pending CN101124774A (en) | 2005-01-25 | 2006-01-19 | Power using delivery to power supply device between detection and classification mode |
| 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 |
Country Status (1)
| Country | Link |
|---|---|
| CN (13) | CN101124771A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104243175A (en) * | 2013-06-11 | 2014-12-24 | 鸿富锦精密工业（深圳）有限公司 | Power backup circuit and Ethernet power supply system and method |
| US9671848B2 (en) | 2013-06-11 | 2017-06-06 | Hon Hai Precision Industry Co., Ltd. | Redundant power supply circuit, power over Ethernet system, and method |
| CN113885638A (en) * | 2021-12-08 | 2022-01-04 | 杭州杰为科技有限公司 | Pd circuit for increasing mps function and method for increasing mps function on pd circuit |
Families Citing this family (65)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101252448B (en) * | 2008-03-31 | 2010-12-22 | 杭州华三通信技术有限公司 | Method and system for detecting current failure of power receiving equipment as well as power supply equipment |
| CN101625389B (en) * | 2009-08-06 | 2011-12-28 | 中国电力科学研究院 | Method for analyzing stability of power system by considering change characteristic of load |
| CN102111019B (en) * | 2009-12-25 | 2014-01-29 | 智邦科技股份有限公司 | Network electricity-taking device and electricity-taking method thereof |
| US8797011B2 (en) * | 2010-01-08 | 2014-08-05 | General Electric Company | Variable current limiter for regulator |
| CN102075331B (en) * | 2010-11-04 | 2014-12-31 | 中兴通讯股份有限公司 | Ethernet power supply end equipment as well as system and method thereof for realizing power supply |
| CN102025511A (en) * | 2010-12-08 | 2011-04-20 | 中兴通讯股份有限公司 | Method and device for supplying power to terminal equipment |
| CA2838054C (en) | 2011-06-09 | 2019-08-20 | Andrew Llc | Distributed antenna system using power-over-ethernet |
| US9639135B2 (en) | 2011-07-18 | 2017-05-02 | Hewlett-Packard Development Company, L.P. | Power consumption limit associated with power over ethernet (PoE) computing system |
| US8823402B2 (en) * | 2011-11-23 | 2014-09-02 | Broadcom Corporation | Cable resistance determination in high-power PoE networks |
| CN103688487A (en) * | 2011-12-15 | 2014-03-26 | 华为技术有限公司 | Power supply method, current sharing module and power supply system |
| CN103595542B (en) * | 2012-08-13 | 2017-02-15 | 中国电信股份有限公司 | A power supply terminal device, a power supply system and a power supply method |
| RU2015111267A (en) * | 2012-08-29 | 2016-10-20 | Конинклейке Филипс Н.В. | METHOD AND APPARATUS FOR MULTIPLEXED POWER AND DATA SUPPLY THROUGH TWO-WIRED DATA TRANSFER CABLE |
| EP2712083B1 (en) * | 2012-09-20 | 2015-02-25 | Infineon Technologies AG | Semiconductor device including short-circuit protection depending on an under-voltage detection |
| US20140136874A1 (en) * | 2012-11-15 | 2014-05-15 | Broadcom Corporation | Low latency discovery for power over ethernet |
| CN103067182B (en) * | 2012-12-26 | 2015-09-23 | 上海华为技术有限公司 | A kind of method of constrained feed and power supply unit |
| CN104062996B (en) * | 2013-03-20 | 2016-12-28 | 鸿富锦精密工业（深圳）有限公司 | Current regulating circuit, POE system and method |
| WO2014170717A1 (en) | 2013-04-17 | 2014-10-23 | Pismo Labs Technology Limited | Methods and systems for supplying and receiving power over ethernet |
| CN104348631B (en) * | 2013-07-26 | 2018-09-18 | 明泰科技股份有限公司 | The selection method of power receiving device, power supply system and operation mode |
| US10411504B2 (en) | 2013-07-31 | 2019-09-10 | Texas Instruments Incorporated | System and method for controlling power delivered to a powered device through a communication cable |
| EP3031170A1 (en) * | 2013-08-08 | 2016-06-15 | Philips Lighting Holding B.V. | Powered device and power distribution system comprising the powered device |
| US20150042243A1 (en) * | 2013-08-09 | 2015-02-12 | Texas Instruments Incorporated | POWER-OVER-ETHERNET (PoE) CONTROL SYSTEM |
| CN104426707B (en) * | 2013-08-20 | 2018-10-19 | 华为技术有限公司 | Detect the method and power supply unit of Power over Ethernet |
| US9897981B2 (en) * | 2013-10-01 | 2018-02-20 | Linear Technology Corporation | Detection and classification scheme for power over ethernet system |
| TWI544761B (en) * | 2014-06-05 | 2016-08-01 | 智邦科技股份有限公司 | Power source equipment and power supply method thereof |
| RU2709188C2 (en) * | 2014-07-08 | 2019-12-17 | Филипс Лайтинг Холдинг Б.В. | Fed device and power distribution system comprising powered device |
| WO2016049841A1 (en) * | 2014-09-30 | 2016-04-07 | Siemens Schweiz Ag | Thermostat having over current management |
| US9967104B2 (en) * | 2014-11-19 | 2018-05-08 | Linear Technology Corporation | Detecting ground isolation fault in ethernet PoDL system |
| US10090666B2 (en) * | 2014-12-01 | 2018-10-02 | Linear Technology Corporation | Circuit architectures for protecting against PoDL wire faults |
| US10027493B2 (en) * | 2015-02-17 | 2018-07-17 | Microsemi P.O.E. Ltd. | PoE power utilization arrangement and method |
| CN104901813B (en) * | 2015-04-09 | 2018-05-22 | 中磊电子（苏州）有限公司 | For electric installation and electric power system |
| US9973343B2 (en) | 2015-04-09 | 2018-05-15 | Sercomm Corporation | Power supply system, power sourcing equipment, and ethernet Y cable |
| DE102015211478A1 (en) * | 2015-06-22 | 2016-12-22 | Siemens Aktiengesellschaft | Interface extension device for a network device and method for operating an interface extension device |
| ES2713754T3 (en) | 2015-06-30 | 2019-05-23 | Signify Holding Bv | Device and method of power supply, power reception device |
| CN104991143B (en) * | 2015-07-10 | 2018-01-23 | 博为科技有限公司 | Power apparatus detection circuit, the method and power apparatus for detecting power apparatus |
| CN105048439B (en) * | 2015-08-10 | 2018-10-12 | 福建星网锐捷网络有限公司 | A kind of method for controlling power supply and device |
| CN108370335A (en) * | 2015-10-27 | 2018-08-03 | 特里马克思发展中心 | The engine framework of the real-time distribution of Ethernet virtual link |
| CN106936598A (en) * | 2015-12-31 | 2017-07-07 | 华为技术有限公司 | POE method and power supply unit and power receiving equipment |
| CN106026056A (en) * | 2016-05-18 | 2016-10-12 | 浙江大华技术股份有限公司 | Anti-impact circuit for power supply equipment, power supply equipment, and Ethernet power supply system |
| CN109085435A (en) * | 2016-07-08 | 2018-12-25 | 蓝龙飞 | A kind of electric system detection communication system |
| CN106130742A (en) * | 2016-08-30 | 2016-11-16 | 杭州华三通信技术有限公司 | Equipment method of supplying power to based on POE system and device |
| CN107888386B (en) * | 2016-09-29 | 2020-08-14 | 九旸电子股份有限公司 | Electric equipment detection device and method for Ethernet power supply system |
| CN108111316B (en) | 2016-11-25 | 2020-02-11 | 新华三技术有限公司 | PSE (Power supply Environment) |
| CN110088538B (en) * | 2016-12-08 | 2021-04-09 | 贝利莫控股公司 | HVAC actuator |
| CN110545707B (en) * | 2017-03-27 | 2022-09-23 | 奥林巴斯株式会社 | Image pickup apparatus |
| CN107147503B (en) * | 2017-04-28 | 2020-06-02 | 华为技术有限公司 | Powered device and POE system |
| CN107271876A (en) * | 2017-07-27 | 2017-10-20 | 深圳市和为顺网络技术有限公司 | PD detects circuit |
| CN107547210B (en) * | 2017-08-25 | 2021-06-18 | 锐捷网络股份有限公司 | Non-standard power supply equipment, powered equipment and system |
| TWI649982B (en) * | 2017-12-08 | 2019-02-01 | 和碩聯合科技股份有限公司 | Ethernet power supply |
| CN109962607B (en) * | 2017-12-26 | 2020-10-02 | 维谛公司 | Current limiting control adjusting method and device |
| CN108132411B (en) * | 2017-12-29 | 2023-10-27 | 重庆市灵龙自动化设备有限公司 | Efficient detector for docking station |
| CN110098941A (en) * | 2018-01-31 | 2019-08-06 | 杭州海康威视数字技术股份有限公司 | A kind of method for controlling power supply and its device |
| CN108318741B (en) * | 2018-03-14 | 2020-04-07 | 维沃移动通信有限公司 | Impedance detection circuit and detection method |
| US10958471B2 (en) * | 2018-04-05 | 2021-03-23 | Cisco Technology, Inc. | Method and apparatus for detecting wire fault and electrical imbalance for power over communications cabling |
| CN109038692B (en) * | 2018-06-27 | 2021-11-16 | 浙江大华技术股份有限公司 | Power supply device |
| CN111092445B (en) * | 2018-10-24 | 2021-10-26 | 华为技术有限公司 | Signal reliability detection method, PSE chip, CPU chip and PoE device |
| CN111175589A (en) * | 2018-11-12 | 2020-05-19 | 华为技术有限公司 | Communication equipment and validity detection method |
| CN113228581B (en) * | 2018-12-11 | 2024-02-02 | 三菱电机株式会社 | Network system, power supply device, and power receiving apparatus |
| CN111398652A (en) * | 2019-01-02 | 2020-07-10 | 禾普股份有限公司 | Test device and power test system |
| CN110798324B (en) * | 2019-09-19 | 2022-11-15 | 浙江大华技术股份有限公司 | Ethernet power supply method, system, power supply end equipment and readable storage medium |
| CN110677264B (en) * | 2019-09-30 | 2021-11-12 | 新华三信息安全技术有限公司 | Method and device for processing power supply fault |
| CN113777522B (en) * | 2020-06-10 | 2022-10-04 | 华为技术有限公司 | Power supply detection device and method and computer program product thereof |
| CN112684383A (en) * | 2020-11-18 | 2021-04-20 | 杭州士兰微电子股份有限公司 | Load connection detection method in Ethernet power supply system and power supply device |
| CN112564739B (en) * | 2020-11-27 | 2021-06-22 | 珠海格力电器股份有限公司 | Power line carrier communication system |
| CN116073658A (en) * | 2021-11-02 | 2023-05-05 | 瑞昱半导体股份有限公司 | Power supply device and method with power limiting mechanism |
| CN114153206A (en) * | 2021-11-29 | 2022-03-08 | 中兴耀维科技江苏有限公司 | AGV system for improving working efficiency of unmanned aerial vehicle robot |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4792745A (en) * | 1987-10-28 | 1988-12-20 | Linear Technology Corporation | Dual transistor output stage |
| WO1998013999A2 (en) * | 1996-09-26 | 1998-04-02 | Philips Electronics N.V. | Power supply circuit, telecommunication device and method for multiple dc slope power management |
| JP3383590B2 (en) * | 1998-08-19 | 2003-03-04 | 沖電気工業株式会社 | Power supply system for LAN compatible telephone terminals |
| US6473608B1 (en) * | 1999-01-12 | 2002-10-29 | Powerdsine Ltd. | Structure cabling system |
| ATE458326T1 (en) * | 1999-11-04 | 2010-03-15 | Alcatel Lucent | METHOD FOR REMOTELY POWERING A TERMINAL DEVICE IN A LOCAL NETWORK |
| FR2819364B1 (en) * | 2001-01-08 | 2003-04-11 | Cit Alcatel | DEVICE FOR TELEALING A TERMINAL IN A TELECOMMUNICATION NETWORK, CONCENTRATOR, AND REPEATER COMPRISING SUCH A DEVICE |
| US6778921B2 (en) * | 2001-04-06 | 2004-08-17 | Eni Technology, Inc. | Modular architecture for industrial power delivery system |
| CN1202639C (en) * | 2001-10-22 | 2005-05-18 | 浙江中控技术有限公司 | Ethernet hub able to implement redundent power supply of network |
| TW200501551A (en) * | 2003-04-23 | 2005-01-01 | Rohm Co Ltd | Audio signal amplifier circuit and electronic apparatus having the same |
-
2006
- 2006-01-09 CN CNA2006800054630A patent/CN101124771A/en active Pending
- 2006-01-09 CN CN2006800093495A patent/CN101147357B/en not_active Expired - Fee Related
- 2006-01-09 CN CN2006800093508A patent/CN101156355B/en active Active
- 2006-01-09 CN CN2006800031925A patent/CN101112042B/en active Active
- 2006-01-09 CN CN200680005472.XA patent/CN101124775B/en active Active
- 2006-01-13 CN CNA200680003193XA patent/CN101129019A/en active Pending
- 2006-01-13 CN CN2006800093423A patent/CN101147355B/en active Active
- 2006-01-13 CN CN200680003200.6A patent/CN101116285B/en active Active
- 2006-01-19 CN CNA2006800054700A patent/CN101124773A/en active Pending
- 2006-01-19 CN CNA2006800054715A patent/CN101124774A/en active Pending
- 2006-01-23 CN CN2006800054698A patent/CN101124772B/en active Active
- 2006-01-23 CN CN2006800031997A patent/CN101112043B/en not_active Expired - Fee Related
- 2006-01-24 CN CNA2006800093438A patent/CN101147356A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104243175A (en) * | 2013-06-11 | 2014-12-24 | 鸿富锦精密工业（深圳）有限公司 | Power backup circuit and Ethernet power supply system and method |
| US9671848B2 (en) | 2013-06-11 | 2017-06-06 | Hon Hai Precision Industry Co., Ltd. | Redundant power supply circuit, power over Ethernet system, and method |
| CN104243175B (en) * | 2013-06-11 | 2017-07-28 | 鸿富锦精密工业（深圳）有限公司 | Power backup circuit, POE system and method |
| CN113885638A (en) * | 2021-12-08 | 2022-01-04 | 杭州杰为科技有限公司 | Pd circuit for increasing mps function and method for increasing mps function on pd circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101124774A (en) | 2008-02-13 |
| CN101156355B (en) | 2011-05-25 |
| CN101112043A (en) | 2008-01-23 |
| CN101112043B (en) | 2010-10-13 |
| CN101129019A (en) | 2008-02-20 |
| CN101147355A (en) | 2008-03-19 |
| CN101116285A (en) | 2008-01-30 |
| CN101124772B (en) | 2012-09-19 |
| CN101112042B (en) | 2012-01-04 |
| CN101147357A (en) | 2008-03-19 |
| CN101147355B (en) | 2011-05-18 |
| CN101124772A (en) | 2008-02-13 |
| CN101124773A (en) | 2008-02-13 |
| CN101124775A (en) | 2008-02-13 |
| CN101116285B (en) | 2015-06-17 |
| CN101147357B (en) | 2010-10-13 |
| CN101124775B (en) | 2014-11-26 |
| CN101147356A (en) | 2008-03-19 |
| CN101156355A (en) | 2008-04-02 |
| CN101112042A (en) | 2008-01-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101124771A (en) | Power sourcing equipment having auto-zero circuit for determining and controlling output current | |
| CN102394757A (en) | Power sourcing equipment having auto-zero circuit for determining and controlling output current | |
| KR101217910B1 (en) | Adjusting current limit thresholds based on power requirement of powered device in system for providing power over communication link | |
| EP1842325B1 (en) | Adjusting current limit thresholds based on output voltage of power supply device in system for providing power over communication link | |
| US7814340B2 (en) | Power management mechanism in system for supplying power over communication link | |
| CN104135375B (en) | The combination of the system middle and high end to be powered by communication link and low-side current sensing | |
| US20060212724A1 (en) | System and method for supporting operations of advanced power over ethernet system | |
| US8014412B2 (en) | Power sourcing equipment having bipolar junction transistor for controlling power supply and supporting AC disconnect-detection function | |
| US20060168458A1 (en) | Detecting legacy powered device in power over ethernet system | |
| KR20070098912A (en) | Utilization of power delivered to powered device during detection and classification mode | |
| KR20070102559A (en) | System for providing power over communication cable having mechanism for determining resistance of communication cable | |
| US20180239407A1 (en) | Power providing device and method | |
| CN219536081U (en) | Optical fiber transceiver with power supply function | |
| CN219627727U (en) | Photoelectric converter supporting PoE output | |
| CN117692264A (en) | Power supply module, power receiving end equipment and Ethernet power supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20080213 |