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

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

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CN101147355B
CN101147355B CN 200680009342 CN200680009342A CN101147355B CN 101147355 B CN101147355 B CN 101147355B CN 200680009342 CN200680009342 CN 200680009342 CN 200680009342 A CN200680009342 A CN 200680009342A CN 101147355 B CN101147355 B CN 101147355B
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current
power
pd
circuit
adjusting
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CN 200680009342
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CN101147355A (en
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C·R·斯坦福
H·J·克里伯格
J·L·奚斯
K·T·苏
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凌特公司
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Priority to US60/646,509 priority
Priority to US11/252,567 priority patent/US9769090B2/en
Priority to US11/252,567 priority
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Priority to PCT/US2006/001284 priority patent/WO2006081083A2/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/32End-user application control systems
    • Y02B70/3208End-user application control systems characterised by the aim of the control
    • Y02B70/3241Domotics or building automation systems
    • Y02B70/325Domotics or building automation systems involving home automation communication networks
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/32End-user application control systems
    • Y02B70/3258End-user application control systems characterised by the end-user application
    • Y02B70/3266The end-user application being or involving home appliances
    • Y02B70/3275The home appliances being or involving heating ventilating or air conditioning [HVAC] units
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20Systems integrating technologies related to power network operation and communication or information technologies mediating in the improvement of the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as enabling technology in buildings sector
    • Y02B90/26Communication technology specific aspects
    • Y02B90/2607Communication technology specific aspects characterised by data transport means between the monitoring, controlling or managing units and the monitored, controlled or operated electrical equipment
    • Y02B90/2638Communication technology specific aspects characterised by data transport means between the monitoring, controlling or managing units and the monitored, controlled or operated electrical equipment using a wired telecommunication network or a data transmission bus
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20Systems integrating technologies related to power network operation and communication or information technologies mediating in the improvement of the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as enabling technology in buildings sector
    • Y02B90/26Communication technology specific aspects
    • Y02B90/2607Communication technology specific aspects characterised by data transport means between the monitoring, controlling or managing units and the monitored, controlled or operated electrical equipment
    • Y02B90/2646Communication technology specific aspects characterised by data transport means between the monitoring, controlling or managing units and the monitored, controlled or operated electrical equipment using phone lines
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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    • Y02B90/2607Communication technology specific aspects characterised by data transport means between the monitoring, controlling or managing units and the monitored, controlled or operated electrical equipment
    • Y02B90/2653Communication technology specific aspects characterised by data transport means between the monitoring, controlling or managing units and the monitored, controlled or operated electrical equipment using wireless data transmission
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20Systems integrating technologies related to power network operation and communication or information technologies mediating in the improvement of the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as enabling technology in buildings sector
    • Y02B90/26Communication technology specific aspects
    • Y02B90/2607Communication technology specific aspects characterised by data transport means between the monitoring, controlling or managing units and the monitored, controlled or operated electrical equipment
    • Y02B90/2669Communication technology specific aspects characterised by data transport means between the monitoring, controlling or managing units and the monitored, controlled or operated electrical equipment involving the use of Internet protocol
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S20/00Systems supporting the management or operation of end-user stationary applications, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y04S20/20End-user application control systems
    • Y04S20/22End-user application control systems characterised by the aim of the control
    • Y04S20/227Domotics or building automation systems
    • Y04S20/228Characterised by involving a home automation communication network
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S20/00Systems supporting the management or operation of end-user stationary applications, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y04S20/20End-user application control systems
    • Y04S20/24End-user application control systems characterised by the end-user application
    • Y04S20/242End-user application control systems characterised by the end-user application the end-user application being or involving home appliances
    • Y04S20/244End-user application control systems characterised by the end-user application the end-user application being or involving home appliances the home appliances being or involving heating ventilating and air conditioning [HVAC] units
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S40/00Systems 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
    • Y04S40/10Systems 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 communication technology
    • Y04S40/12Systems 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 communication technology characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/124Systems 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 communication technology 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
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S40/00Systems 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
    • Y04S40/10Systems 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 communication technology
    • Y04S40/12Systems 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 communication technology characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/125Using phone lines
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S40/00Systems 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
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    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S40/00Systems 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
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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

根据通过通信链路供电的系统中用电设备的功率要求调节 The power supply system over a communication link in the electrical equipment required adjustment

限流阈值 Limit threshold

[0001] 本申请要求美国临时专利申请号60/646,509的优先权,该申请的申请日为2005 年1月25日,发明名称为"支持先进的以太网供电系统的系统和方法(SYSTEMAND METHOD FOR SUPPORTING ADVANCED POWER OVER ETHERNETSYSTEM)“。 [0001] This application claims priority to US Provisional Patent Application No. 60 / 646,509, the filing date of the application is January 25, 2005, entitled "System and method for advanced support Power over Ethernet system (SYSTEMAND METHOD FOR SUPPORTING ADVANCED POWER OVER ETHERNETSYSTEM) ".

技术领域 FIELD

[0002] 本发明涉及供电系统,更具体地讲,涉及按照用电设备的功率要求,用于调节通过通信链路供电的系统,如以太网供电(PoE)系统中限流阈值的电路和方法。 [0002] The present invention relates to power supply systems, and more particularly, to electrical apparatus in accordance with the power requirement for regulating the power supply system via a communication link, such as a Power over Ethernet (PoE) system limit threshold circuit and method .

背景技术 Background technique

[0003] 在过去若干年中,以太网业已成为局域网最常用的方法。 [0003] In the past several years, Ethernet has become the most commonly used method for local area networks. IEEE802. 3组,以太网标准的发起人,业已开发了该标准的延伸形式,称作IEEE 802. 3af,定义通过以太网电缆供电。 IEEE802. 3 group, the Ethernet standard promoters, have been developed to extend the standard form, called IEEE 802. 3af, the definition of power over Ethernet cabling. IEEE 802. 3af标准定义以太网供电(PoE)系统,该系统涉及通过非屏蔽双绞线将电力从供电设备(PSE)传输到位于链路相对侧的用电设备(PD)。 IEEE 802. 3af standard defines a Power over Ethernet (PoE) system that involves unshielded twisted pair transmission power from the power supply device (PSE) located on the opposite side of the link powered device (PD). 传统上,网络设备诸如IP电话,无线LAN接入点,个人计算机和网络摄像机需要两个连接:一个连至LAN,而另一个连至供电系统。 Traditionally, network devices such as IP phones, wireless LAN access points, personal computers and Web cameras required two connections: one to the LAN, and the other is connected to the power supply system. 所述PoE系统消除了需要额外插口和接线,以向网络设备供电。 The PoE system eliminates the need for additional outlets and wiring to supply power to network devices. 取而代之的是, 通过用于数据传输的以太网电缆供电。 Instead, powered via an Ethernet cable for data transmission.

[0004] 如IEEE802. 3af标准所定义的,PSE和PD是非数据实体,允许网络设备利用与用于数据传输同类的电缆供电和获得电力。 [0004] The IEEE802. 3af defined by a standard, PSE and PD are non-data entities allowing network devices using the same cable for power supply and data transmission and access to electricity. PSE是在物理连接点电连接至电缆的设备,它向链路供电。 PSE is a physical connection point electrically connected to the device cable, which power to a link. PSE通常与以太网开关,路由器,网络集线器或其他网络交换设备或中跨供电设备相连。 PSE is typically Ethernet switch, router, hub or other network switching equipment or midspan power supply apparatus is connected. PD是获得供电或请求供电的设备。 Obtaining PD requesting power supply or device. PD可以与诸如数字IP电话,无线网络接入点, PDA或笔记本电脑扩展坞,移动电话充电器和HVAC恒温器等设备相连。 PD may dock with such as digital IP telephones, wireless network access points, PDA or notebook computer, is connected to a mobile phone chargers and HVAC thermostats and other equipment.

[0005] PSE的主要功能是为请求供电的PD搜索链路,可选地对PD分级,如果检测到PD则向所述链路供电,监控链路上的供电,并且在不再请求或者需要时切断电源。 [0005] The main functions of the PSE are to search the link PD requesting power, optionally classify the PD on, the PD is detected if the power supply to the link, monitors the power on the link, and is no longer requested or required when you disconnect the power supply. PD通过呈现由IEEE802. 3af标准定义的PoE检测信号来参与PD检测程序。 By presenting PoE detection signal PD by the IEEE802. 3af defined criteria to participate in the PD detection procedure.

[0006] 如果检测信号是有效的,PD可以选择向PSE呈现分级信号,以表示在上电时它会提取多少电力。 [0006] If the detection signal is valid, PD classification can choose to render a signal to the PSE, to indicate how much power upon power it will extract. 可以将PD分级为级别O到级别4。 PD can be classified as class O to level 4. 级别1的PD需要PSE提供至少4. Off, 级别2的PD需要PSE提供至少7. Off,级别0,3或4的PD需要至少15. 4W。 Level PD 1 requires that the PSE supplies at least 4. Off, PD class 2 requires that the PSE supplies at least 7. Off, grade PD 0,3 or 4 requires at least 15. 4W. 根据PD的确定级别,PSE向PD提供所需的电力。 According to determine the level of PD, PSE provides the required power to the PD.

[0007] 当向PD供电时,PSE相对于某些限流阈值,如PSE在短路状态下的最大输出电流(Ium),和过载电流检测范围(Icm)监控它的输出电流。 [0007] When the power to the PD, relative to the PSE certain limit threshold, such as maximum PSE output current at short circuit state (Ium), and an output current overload current detection range (Icm of) monitoring it. 具体地讲,PSE应当能够承受电源电缆内任何导线到任何其他导线的短路而不损坏,如果通过所述短路的电流强度不超过IUM。 In particular, PSE should be able to withstand any wires to short-circuit the power cable without damaging any other wires, through the short-circuit if the current intensity does not exceed IUM. 另外,当PSE的输出电流超过Icut的时间超出过载时限(Tovld)时,可以检测到过载状态。 Further, when the output current exceeds Icut PSE exceeds an overload time limit (Tovld), it can detect the overload state.

[0008] 在许多PSE中,Ium和Iem的值被保持在由IEEE802. 3af标准定义的相应范围的固定水平。 [0008] In many of the PSE, and Iem Ium value is kept at a fixed level corresponding to the range defined by IEEE802. 3af standard. 例如,Ium的值可以保持在425mA,而Iem的值可以保持在375mA。 For example, Ium value can be maintained at 425mA, while the value of Iem may be maintained at 375mA. 不过,为了使PSE能够与各种类型的PD工作,并且满足各种功率要求,希望使限流阈值可以根据PD的要求进行调节。 However, in order to work with various types of PSE PD, and meet power requirements, desired to limit threshold can be adjusted according to the requirements of the PD.

[0009] 另外,IEEE802. 3af标准规定了PD的输入限流阈值。 [0009] Further, IEEE802. 3af standard specifies the input current limit threshold of the PD. 具体地讲,标准将PD的输入突入电流Ilmush限制在最大值为400mA。 Specifically, the standard PD Ilmush input inrush current limit to a maximum of 400mA. 不过,希望使输入限流阈值可以根据PD要求进行调节。 However, it is desirable that the input current limit threshold may be adjusted according to the requirements of PD.

发明内容 SUMMARY

[0010] 本发明提供了新型系统和方法,用于按照PD的要求调节供电设备和/或用电设备(PD)的限流阈值。 [0010] The present invention provides a novel system and method for regulating the power supply apparatus and / or powered device (PD) a current limit threshold of the PD in accordance with the requirements.

[0011] 根据本发明的一个方面,通过通信链路向PD供电的系统具有要求决定电路,用于确定PD的要求;和控制电路,用于根据确定的PD要求,设定参数限制PSE的输出信号。 [0011] In accordance with one aspect of the present invention, by having a communication link to the PD power requirements of the system determination circuit for determining a PD requirement; and a control circuit for outputting in accordance with the determined requirements of PD, the PSE parameter limits set signal. 例如,PD可以通过以太网由供电设备(PSE)供电。 For example, PD may be powered by a Power over Ethernet equipment (PSE).

[0012] 具体地讲,所述控制电路可以根据确定的PD要求,如功率要求,设定限流阈值。 [0012] Specifically, the control circuit may determine the requirements of PD, such as power requirements, set limit threshold. 例如,PSE在短路状态的最大输出电流和/或PSE的过载电流检测范围可以按照PD的功率要求调节。 For example, PSE maximum output current in the short circuit condition and / or the overload current detection range can be adjusted according to the power requirements PD of the PSE.

[0013] 另夕卜,PD的输入电流阈值可以按照PD的功率要求调节。 [0013] Another Bu Xi, PD input current threshold can be adjusted according to the power requirements of the PD.

[0014] 根据本发明的一个实施例,控制电路可以按照PD的功率要求在多个预定值中选择PSE的限流阈值的合适值。 [0014] According to one embodiment of the present invention, the control circuit may select an appropriate value of the current limit threshold of the PSE at a plurality of predetermined values ​​in accordance with the power requirements of the PD. 所述决定电路可以根据分级程序确定PD的功率要求。 The determining circuit may determine the power requirement of the PD in accordance with classification procedure.

[0015] PSE还可以包括可由控制电路控制的限流电路,用于限制PSE的输出电流。 [0015] PSE may further comprise an output current limiting circuit may be controlled by the control circuit, for limiting the PSE. 具体地讲,所述限流电路可以控制PSE的输出场效应晶体管或双极晶体管,以防止PSE的输出电流超过PSE在短路状态下的最大输出电流。 Specifically, the current limiting circuit may control the output of PSE field effect transistor or a bipolar transistor, the PSE to prevent the output current exceeds the maximum output current of the PSE at a short circuit condition.

[0016] 另外,当PSE的输出电流超过确定的过载电流检测范围的时间超出预定时限时, 所述限流电路可使PSE能够断开PSE的输出晶体管。 [0016] Further, when the output current of the PSE exceeds a determined overload current detection range time exceeds a predetermined limit, the current limiting circuit enables the PSE to disconnect the output transistor of the PSE.

[0017] 根据本发明的方法,可以实施以下步骤,以控制供电设备: [0017] The method of the present invention, the following steps may be implemented to control the power supply apparatus:

[0018]-确定由供电设备供电的负载的功率要求,和 [0018] - determined by the load power supply device power requirements, and

[0019]-按照确定的功率要求调节限流阈值。 [0019] - adjusting the current limit threshold value according to the determined power requirements.

[0020] 具体地讲,供电设备在短路状态下的最大输出电流和/或供电设备的可接受过载电流可以根据确定的功率要求调节。 [0020] Specifically, the power supply apparatus through an acceptable maximum output current in the short circuit condition and / or a load current power supply apparatus can be adjusted based on the determined power requirements.

[0021] 另外,负载的最大输入电流可以根据确定的功率要求调节。 [0021] In addition, the maximum input current load can be adjusted according to the determined power requirements.

[0022] 根据本发明的另一方面,PoE系统可以包括PD,向PD供电的PSE,和用于根据PD上的信息调节PSE和/或PD的限流阈值的调节电路。 [0022] According to another aspect, PoE system of the present invention may include a PD, the PD power PSE, and a regulating circuit for regulating the PSE and / or PD PD based on information on the current limit threshold value. 具体地讲,所述调节电路可以按照PD 的功率要求调节限流阈值。 Specifically, the adjustment circuit may require adjusting the current limit threshold of the PD in accordance with the power.

[0023] 按照本发明的另一方面,局域网包括至少一对网络节点,网络集线器,和用于连接网络节点和网络集线器以提供数据通信的通信电缆。 [0023] According to another aspect of the present invention, the local area network comprising at least a pair of network nodes, a network hub, and means for connecting the network nodes and the network hub to provide data communications of the communication cable. 所述网络集线器具有供电设备,用于通过通信电缆向负载供电。 The network hub having a power supply device for supply to a load via a communication cable. 所述网络包括要求决定电路,用于确定负载的要求,和控制电路,用于按照负载的确定要求,设定参数限制通过通信电缆供电的系统中的电流。 The network comprises a requirement determining circuit for determining the requirements of the load, and a control circuit for determining in accordance with the required load, the current limit setting parameters through the communication cable in the power supply system.

[0024] 具体地讲,所述控制电路可以按照负载的功率要求,确定供电设备的限流阈值和/ 或负载的输入电流阈值。 [0024] Specifically, the power control circuit in accordance with the required load can be determined limit threshold of the power supply apparatus and / or input current threshold load.

[0025] 通过以下详细说明,本领域技术人员可以更方便地理解本发明的其他优点和方面,其中,示出并且披露了本发明的实施例,仅仅以说明用于实施本发明的最佳方式的形式 [0025] The following detailed description, those skilled in the art may more easily be understood that other aspects and advantages of the invention, wherein is shown and disclosed embodiments of the present invention, but merely to illustrate the best mode embodiment of the present invention for form

5提供。 5 provides. 正如所要披露的,本发明能够以其他和不同的实施例实施,并且,它的若干细节能够以各种显而易见的方式进行改进,所有这样的改进都没有偏离本发明的精神。 As will be disclosed, the present invention is capable of other embodiments and different embodiments, and its several details are capable of modification in various obvious ways, all such modifications are not departing from the spirit of the invention. 因此,附图和说明被视为说明性的,而不是限制性的。 Accordingly, the drawings and description are to be regarded in an illustrative, and not restrictive.

附图说明 BRIEF DESCRIPTION

[0026] 以下对本发明实施例的详细说明通过结合以下附图能够得到最佳的理解,其中, 特征不一定是按比例绘制的,而是以能够最好说明相关特征的形式绘制的,其中: [0026] The following detailed description of embodiments of the present invention in conjunction with the following drawings can be best be understood, wherein the features are not necessarily drawn to scale, but rather to best illustrate relevant features in the form of drawing, wherein:

[0027] 图1是示出本发明的限流调节机构的方框图。 [0027] FIG. 1 is a block diagram showing the current limiting adjustment mechanism of the present invention.

[0028] 图2是示出本发明的限流电路工作的示意图。 [0028] FIG. 2 is a diagram showing the current limiting circuit according to the present invention.

具体实施方式 Detailed ways

[0029] 本发明将利用调节以太网供电(PoE)系统中PSE在短路状态下的最大输出电流(Ilim)值,和过载电流检测范围(Icut)值为例进行说明。 [0029] The present invention is adjusted using a Power over Ethernet (PoE) system PSE maximum output current value (Ilim) at the short-circuited state, and the overload current detection range (Icut) value described as an example. 不过,显而易见,本文所披露的构思可应用于任何网络。 However, it is obvious concepts disclosed herein can be applied to any network.

[0030] 例如,本发明的系统可用在局域网(LAN)中,所述局域网具有多个节点,网络集线器和将节点连接到网络集线器用于提供数据通信的通信电缆。 [0030] For example, in the system of the present invention may be a local area network (LAN), a local area network having a plurality of nodes, a network hub and communication cable connecting the node to the network hub for providing data communications. 所述网络集线器可以包括供电设备,而所述通信电缆可用于从供电设备向负载供电。 The network hub may include a power supply apparatus, and the communication cable can be used to supply the load from the power supply apparatus.

[0031] 另外,如本领域技术人员所认识到的,本发明的构思可用于调节负载,如PD的最大输入电流值。 [0031] Further, a load, such as the maximum value of the input current of PD As those skilled in the art will recognize that the concepts of the present invention may be used to adjust.

[0032] 图1示出简化方框图,示出了PoE系统中本发明的限流调节机构10,它包括PSE12,和PD 14,可通过链路16连接至PSE12,所述链路可利用以太网电缆内2或4组双绞线提供。 [0032] FIG. 1 shows a simplified block diagram illustrating a current limit adjusting mechanism PoE system 10 of the present invention, which includes a PSE 12, and a PD 14, 16 may be connected to the PSE 12 via a link, the link may utilize Ethernet 2 or 4 twisted pair within the cable provided. 例如,PSE12可以安置在单独的芯片上。 For example, the PSE 12 may be disposed on a separate chip. 正如下面更详细披露的,本发明的限流调节机构10可以使用PD检测和分级电路18,阈值控制电路20和限流电路22执行它的操作。 As disclosed in more detail below, the current limit adjusting mechanism 10 of the present invention may be used PD detection and classification circuit 18, the threshold control circuit 20 and a current limiting circuit 22 performs its operation. 上述电路可以设置在PSE芯片12上。 The circuit may be provided on the PSE chip 12.

[0033] PSE12中提供有限流电路22,以响应过流事件,如短路状态和过载状态。 [0033] PSE12 current limiting circuit 22 provided in response to an overcurrent event, such as a short circuit state and an overload state. 例如, IEEE802. 3af标准要求PSE能够承受电源电缆内任何导线到任何其他导线的短路而不损坏,如果通过所述短路的电流强度不超过被称作PSE在短路状态下最大输出电流的电流 For example, IEEE802. 3af PSE accept any standard conductor power cable to short-circuit the wires without damage to any other, if the intensity of the current through the short circuit current of the PSE at a short circuit is referred to as a state not more than the maximum output current

Ilmo Ilmo

[0034] 另外,IEEE802.3af标准要求当检测到过载状态时PSE从电源接口移去电源。 [0034] Further, IEEE802.3af PSE standard requires that when power is removed from the power connector overload state is detected. 当PSE的输出电流超过电流Icut(称为过载电流检测范围)的时间超出预定时间间隔,如过载时限(Tovld)时,可以检测到过载状态。 PSE when the output current exceeds the current Icut time (referred to as an overload current detection range) exceeds a predetermined time interval, such as when an overload time limit (Tovld), can detect the overload state.

[0035] 限流电路22监控PSE12的输出电流,以使电流保持在Ium或低于IUM。 [0035] 22 monitoring PSE12 output current limiting circuit, such that the current is maintained at or below Ium IUM. 另外,当PSE12的输出电流超过Icut的时间超出预定时间间隔时,限流电路22指示,使得PSE12能够取消对PD14的供电。 Further, when the output current exceeds Icut PSE12 time exceeds a predetermined time interval, indicating the current limiting circuit 22, so that the power supply to the PSE12 possible to eliminate the PD14.

[0036] 在很多PSE中,Ium和Icut值保持在由IEEE802. 3af标准定义的相应范围内的固定水平。 [0036] In many of the PSE, Ium and Icut value remains fixed level within the respective range defined by IEEE802. 3af standard. 例如,Ium的值可以保持在425mA,而Iem的值可以保持在375mA。 For example, Ium value can be maintained at 425mA, while the value of Iem may be maintained at 375mA. 不过,本发明的限流调节机构10允许限流阈值Ium和Iot按照特定的PD要求进行调节。 However, the current limit adjusting mechanism 10 of the present invention allow the current limit threshold and Ium Iot be adjusted as specific requirements of PD.

[0037] 具体地讲,可以按照PD的功率要求控制限流阈值。 [0037] Specifically, the control may be required in accordance with the power limit threshold of the PD. 例如,检测和分级电路18可用于提供PD功率要求的信息。 For example, the detection and classification circuit 18 may be used to provide information PD power requirements. 如IEEE802. 3af标准所定义的,PSE12和PD14参与PD检测程序,在此期间,PSE12探查链路16以检测PD。 The IEEE802. 3af defined by a standard, PSE 12 and the PD detection procedure involved in PD14, during this period, 16 PSE 12 probes a link to detect a PD. 如果检测到PD,PSE12检查PD检测信号,以确定它是有效的还是无效的。 If the PD is detected, PSE 12 checks the PD detection signal to determine whether it is valid or invalid. 有效和无效的检测信号在IEEE802.3af标准中有定义。 Valid and invalid detection signal is defined in IEEE802.3af standard. 有效的PD检测信号表示PD处于会接受供电的状态,而无效的PD检测信号表示PD处于不会接受供电的状态。 A valid PD detection signature indicates that the PD is in a state will accept power, the non-valid PD detection signature indicates that the PD is in a state not accept power.

[0038] 如果所述信号有效,PD可以选择向PSE呈现分级信号,以指示在上电时会提取多少电力。 [0038] If the signal is valid, PD classification signals may be selected to exhibit PSE, to indicate how much power would be on power extraction. 可以将PD分级为级别0-级别4。 PD can be classified as Level 4 scale 0-4. 级别1的PD要求PSE提供至少4. Off,级别2的PD要求PSE提供至少7. Off,而级别0,3或4的PD要求至少15. 4W。 Level PD 1 requires that the PSE supplies at least 4. Off, PD level 2 requires that the PSE supplies at least 7. Off, the level of 0,3 or PD 4 requires at least 15. 4W. 另外,PD可以将其自身识别为要求比IEEE802. 3af标准要求提供功率更高的功率的设备。 Further, PD may identify itself as requiring higher power than the power device IEEE802. 3af standards. 大功率PSE能够提供请求的功率。 High-power PSE capable of providing power request. 因此,PD的功率要求可以在大范围波动。 Thus, PD power requirement may fluctuate over a wide range.

[0039] PD检测和分级电路18可以确定PD14的功率要求,并且向阈值控制电路20提供对应的信息,用于产生适合确定功率要求的限流阈值。 [0039] PD detection and classification circuit 18 may determine the power requirements PD14, and the information control circuit 20 corresponding to the threshold value, adapted to determine power requirements for generating the current limit threshold. 例如,阈值控制电路20可以与电流极限查阅表相互作用,所述查阅表储存用于各种PD功率要求的限流阈值1皿和Iot的值。 For example, the threshold control circuit 20 may interact with the current limit look-up table, the look-up table stored for various values ​​of PD power requirements limit threshold Iot 1 and the dish. 根据PD14所需功率的特定值,阈值控制电路20可以访问电流极限查阅表,以确定用于所述特定功率值的Ium和Iot值。 According to a particular value of the required power of the PD 14, the threshold control circuit 20 can access the current limit look-up table, and to determine Ium Iot values ​​for the particular power value. 阈值控制电路20可以包括多个电流源,按照确定的Ium和Iem 值可选地提供限制值,以向限流电路22提供相应的阈值电压Vum和VCUT。 A threshold control circuit 20 may include a plurality of current sources, according to the determined values ​​Iem Ium and optionally provided limiting value, to provide the corresponding threshold voltage Vum VCUT and the current limiting circuit 22.

[0040] 如图2所示,可以通过(kite (门极)端控制外部功率MOSFETM的门驱动电压来提供从PSE12向PD14的输电。例如,MOSFETM可以受控方式将-48V输入电源连接到PSE输出端口,满足PD的功率要求。限流电路22通过Sense (感测)端,通过监控连至M0SFET24 的外部感测电阻Rsense两端的电压Vsense,来监控PSE12的输出电流。 [0040] 2, by (Kite (gate) terminal of the control gate driving voltage of the external power from the transmission to provide MOSFETM PSE12 to PD14 example, MOSFETM can be connected in a controlled manner to -48V input power PSE output ports to meet the power requirements of the PD. sense current limiting circuit 22 (sense) end, is connected to the voltage Vsense across sense resistor Rsense M0SFET24 of the external sensor to monitor the output current by monitoring PSE12.

[0041] 如上所述,阈值控制电路20向限流电路22提供阈值电压Vum,所述电压可以根据为特定PD功率要求选择的Ium值,确定为IumX&。 [0041] As described above, the threshold control circuit 20 provides the threshold voltage Vum to the current limiting circuit 22, the voltage may be selected as required for a particular PD power Ium value, it is determined IumX &. 限流电路22可以控制MOSFET的门电压,以在受监控的电压Vsense超过阈值电压Vum时,降低PSE的输出电流。 The current limiting circuit 22 may control the gate voltage of the MOSFET, to when the monitored voltage Vsense exceeds the threshold voltage Vum, reduce the output current of the PSE. 例如,限流电路22可以包括运算放大器,它将阈值电压Vum和感测电压Vsense作比较,以产生输出电压,它在电压Vsense超过阈值电压Vum时,降低M0SFET24的门电压。 For example, the current limiting circuit 22 may comprise an operational amplifier, the threshold voltage Vum it and the sense voltage Vsense is compared to generate an output voltage, its threshold voltage Vsense exceeds the voltage Vum, reducing a gate voltage of M0SFET24. 结果,PSE12的输出电流被保持在Ium水平或低于Ium水平。 A result, the output current of the PSE 12 is maintained at or below the level Ium Ium level.

[0042] 另外,阈值控制电路20可以向限流电路22提供阈值电压Vot,它可以根据为特定PD功率要求选择的Iem值确定为IeuTXRs。 [0042] Further, the threshold control circuit 20 may provide a threshold voltage Vot to the current limiting circuit 22, which may be determined according to the requirements IeuTXRs selected for a particular PD power Iem value. 当监控电压Vsense超过阈值电压Vem的时间超出预定时间间隔时,限流电路22可以指示,以便取消对PD14的供电。 When the monitored voltage Vsense exceeds the threshold voltage Vem exceeds the predetermined time interval, a current limiting circuit 22 may indicate that, in order to cancel the supply of power to PD14. 具体地讲,限流电路22可以具有过载定时器,当感测电压Vsense超过阈值电压Vcut时启动。 Specifically, the current limiting circuit 22 may have the overload timer is started when the sensing voltage Vsense exceeds the threshold voltage Vcut. 如果当由定时器定义的过载时限期满时感测电压Vsense仍然高于Vot水平,M0SFET24会被断开,以取消对PD14的供电。 If when the overload limit defined by the timer expires sense voltage Vsense is still higher than Vot level, M0SFET24 will be disconnected in order to cancel the power to PD14. 例如,过载时限可以在50ms-75ms范围内,以符合IEEE 802. 3af标准。 For example, the overload time limit may be in the range 50ms-75ms, to meet the standard IEEE 802. 3af.

[0043] 因此,本发明的限流调节机构按照特定PD的功率需求调节1皿和/或Iot阈值。 [0043] Thus, the adjustment mechanism limiting the present invention regulating a dish and / or a threshold Iot The power requirements of a particular PD.

[0044] 另外,IEEE802. 3af标准将PD的输入突入电流Ilnrash限制在最大400mA。 [0044] Further, IEEE802. 3af standards PD input inrush current is limited to a maximum Ilnrash 400mA. 除了控制PSE的输出限流阈值之外或取代控制输出限流阈值,本发明的限流调节机构可用于调节PD的输入限流阈值。 In addition to controlling the output of PSE or substituted limit threshold control output limit threshold, the present invention limits the flow adjustment mechanism may be used to adjust the input current limit threshold of the PD.

[0045] 例如,PD14可以包括输入限流电路,它将PD的输入电流和输入电流阈值作比较, 以将输入电流限制在由输入电流阈值设定的最大值。 [0045] For example, the PD 14 may include an input limiting circuit, input current and input current threshold of the PD will be compared to the maximum input current limit set by the input current threshold. 可以按照PD的特定功率要求调节输入电流阈值。 It may be required to adjust the input current threshold in accordance with a particular power PD. 具体地讲,当PD要求较高的功率时,可以使PD以较大的输入电流工作。 Specifically, when the higher power requirements of PD, PD can work with a large input current.

[0046] 以上说明示出和披露了本发明的各个方面。 [0046] The above description illustrates various aspects of the present disclosure and invention. 另外,所示出和披露的内容仅仅是优选实施例,但是如上所述,应当理解,本发明能够使用各种其他组合,改进,和环境,并且能够在本文所体现的发明构思范围内进行改变或改进,与上述教导,和/或相关领域的技能或知识匹配。 In addition, it is shown and disclosure of preferred embodiments only, but as described above, it should be understood that the present invention is capable of use in various other combinations, modifications, and environments and is capable of changes within the inventive concepts herein embodied range or improved, with the above teachings, and / or related fields of knowledge or skills to match. 例如,除了调节1皿和/或Iot阈值,本发明的调节机构可以根据PD的要求调节PSE和/或PD的其他信号和/或参数。 For example, in addition to adjusting a dish and / or Iot threshold adjustment mechanism of the present invention may be adjusted PSE and / or other signal PD and / or parameters in accordance with requirements of the PD.

[0047] 上述实施例还可用于解释已知用于实施本发明的最佳方式,并且使得本领域技术人员能够以上述或其他实施例的形式利用,并且根据本发明的具体应用或用途的要求进行各种改进。 [0047] The above embodiments may also be used to explain the best mode known for practicing the invention, and that those skilled in the art to the above embodiments or other forms utilized in, and depending on the particular applications or uses of the present invention requires various improvements.

[0048] 因此,本说明书不是要将本发明局限于本文所披露的形式。 [0048] Accordingly, the present description is not intended to limit the invention to the form disclosed herein. 另外,希望将所附权利要求书理解成包括可选实施例。 Further, it is desirable that the appended claims be understood to include alternative embodiments.

Claims (23)

1. 一种通过通信链路向用电设备PD供电的系统,包括:限流电路,用于监控系统中的电流,所述限流电路响应第一过流事件,以便根据为响应第一过流事件而定义的第一限流阈值限制电流,功率要求决定电路,用于确定用电设备PD的功率要求,和限流调节机构,用于根据确定的用电设备PD功率要求调节第一限流阈值,以便为特定用电设备PD功率要求产生第一限流阈值的调节值,所述限流电路被提供第一限流阈值的调节值,以便根据第一限流阈值的调节值响应第一过流事件。 An electrical power to the PD device system via a communication link, comprising: a current limiting circuit, the current monitoring system for a first flow circuit in response to an overcurrent event the limit, according to a first response over a first current limit threshold defined stream event limits the current, power requirement determining circuit for determining the electrical power requirements of the PD device, and limiting an adjustment mechanism for adjusting the first threshold based on the determined requirements of the powered device PD power current threshold, so as to generate a first adjustment value limit threshold for a particular PD power requirement powered device, the limit value of the flow regulating circuit is provided a first current limit threshold, in accordance with the first adjustment value in response to a first current limit threshold an over-current event.
2.根据权利要求1所述的系统,其中,用电设备PD由供电设备PSE通过以太网供电。 2. The system according to claim 1, wherein the powered device PD by a PSE power over Ethernet powered device.
3.根据权利要求1所述的系统,其中,所述限流电路被设置以响应第二过流事件,以便根据为响应第二过流事件而定义的第二限流阈值限制电流,和所述限流调节机构被设置根据确定的用电设备PD功率要求调节第二限流阈值,以便为特定用电设备PD要求产生第二限流阈值的调节值。 3. The system according to claim 1, wherein the current limiting circuit is arranged to respond to a second overcurrent event, in order to limit current in accordance with a second limit threshold in response to an overcurrent event and second definition, and the adjusting said flow restrictor means are provided in accordance with the determined power requirement of the PD electrical adjusting the second current limit threshold to produce a second adjustment value limit threshold requirements for a particular powered device PD.
4.根据权利要求1所述的系统,其中,所述限流调节机构被设置用于根据用电设备PD 的功率要求,调节供电设备PSE在短路状态下的最大输出电流。 4. The system of claim 1, wherein said current limiting means are provided for adjusting the power requirements of the electrical equipment according to PD, the PSE power supply equipment adjusting the maximum output current in the short circuit condition.
5.根据权利要求1所述的系统,其中,所述限流调节机构被设置用于根据用电设备PD 的功率要求,调节供电设备PSE的过载电流检测范围。 5. The system according to claim 1, wherein said current limiting means are provided for adjusting the power according to the requirements of the powered device PD, the PSE power supply equipment adjusting the overload current detection range.
6.根据权利要求1所述的系统,其中,所述限流调节机构被设置根据用电设备PD的功率要求,在多个预定值中选择限流阈值的合适值。 6. The system according to claim 1, wherein said current limiting means is adjusted depending on the power requirements of the powered device PD, the current limit threshold to select a plurality of predetermined values ​​appropriate value.
7.根据权利要求1所述的系统,其中,所述限流电路可由限流调节机构控制,用于限制供电设备PSE的输出电流。 7. The system according to claim 1, wherein said output current limiting circuit may control adjustment means, for limiting the power supply device limiting the PSE.
8.根据权利要求7所述的系统,其中,所述限流电路被设置用于控制供电设备PSE的输出晶体管的电极,以防止供电设备PSE的输出电流超过供电设备PSE在短路状态下的确定最大输出电流。 8. The system of claim 7, wherein the electrode of the output transistor circuit is provided for controlling the power supply device limiting the PSE, the PSE to prevent the output current of the power supply apparatus exceeds PSE power supply apparatus is determined in a short circuit state The maximum output current.
9.根据权利要求7所述的系统,其中,所述限流电路被设置用于当供电设备PSE的输出电流超过确定的过载电流检测范围的时间超出预定时限时,使供电设备PSE能够断开供电设备PSE的输出晶体管。 9. The system of claim 7, wherein the circuitry is arranged for, when the output current of the power supply apparatus PSE exceeds a determined time overload current detection range exceeds a predetermined limiting time, the power supply apparatus capable of cleaving PSE PSE power supply apparatus of the output transistor.
10.根据权利要求2所述的系统,其中,所述功率决定电路被设置成根据分级程序确定用电设备PD的功率要求。 10. A system according to claim 2, wherein said power determining circuit arranged to determine a powered device PD classification procedure in accordance with the power requirement.
11.根据权利要求1所述的系统,其中,所述限流调节机构被设置用于根据用电设备PD 的功率要求,调节用电设备PD的输入限流阈值。 11. The system according to claim 1, wherein said current limiting means are provided for adjusting The electrical power requirements of the PD, powered device PD adjusting an input current limit threshold.
12. —种控制供电设备的方法,包括以下步骤:通过根据为第一过流事件而定义的第一限流阈值限制电流,来响应第一过流事件,确定由供电设备供电的负载的功率要求,根据确定的功率要求调节第一限流阈值,和为了响应第一过流事件,根据为特定负载功率要求所调节的第一限流阈值限制电流。 12. The - method of controlling the power supply apparatus, comprising the steps of: a first current limit threshold values ​​according to a first overcurrent limiting current event is defined, a first response to an overcurrent event, the power is determined by the load power supply device demands to a first power adjustment based on the determined current limit threshold, and in response to a first overcurrent event, limiting the load current based on a particular power requirements adjusting a first current limit threshold.
13.根据权利要求12所述的方法,其中,所述供电设备在短路状态的最大输出电流根据确定的功率要求进行调节。 13. The method according to claim 12, wherein the maximum output current of the power supply apparatus in a short circuit condition is adjusted according to the determined power requirements.
14.根据权利要求12所述的方法,其中,所述供电设备的最大过载电流根据确定的功率要求进行调节。 14. The method according to claim 12, wherein said power supply apparatus is the maximum overload current is adjusted according to the determined power requirements.
15.根据权利要求12所述的方法,其中,所述负载的输入电流根据确定的功率要求进行调节。 15. The method of claim 12, wherein said load current input is adjusted according to the determined power requirements.
16. 一种通过以太网供电的系统,包括: 用电设备PD,向用电设备PD供电的供电设备PSE,限流电路,用于监控系统中的电流,所述限流电路响应第一过流事件,以便根据为响应第一过流事件而定义的第一限流阈值限制电流,功率要求决定电路,用于确定用电设备PD的功率要求,和调节电路,用于根据确定的用电设备PD功率要求调节第一限流阈值,以便为特定用电设备PD要求产生第一限流阈值的调节值,所述限流电路被提供第一限流阈值的调节值,以便根据第一限流阈值的调节值响应第一过流事件。 16. A powered by the Ethernet system, comprising: a powered device the PD, the PSE PD power supply device of electrical equipment, the current limiting circuit, the current monitoring system for a current limiting circuit responsive to the first through the stream events, according to a first limit current limit threshold in response to a first overcurrent event defined, the power requirement determining circuit for determining the electrical power requirements of the PD device, and adjusting circuit for determining the electricity adjusting a first power requirement of the PD current limit threshold so as to generate a first adjustment value limit threshold requirements for a particular powered device PD, the current limiting circuit is adjusted to provide a first current limit value of the threshold value, according to a first limit adjusting the current threshold value in response to a first overcurrent event.
17.根据权利要求16所述的系统,其中,所述调节电路被设置用于根据用电设备PD的功率要求,调节供电设备PSE在短路状态下的最大输出电流。 17. The system according to claim 16, wherein said adjusting circuit is provided for electrical apparatus according to power requirements of the PD, PSE power supply equipment adjusting the maximum output current in the short circuit condition.
18.根据权利要求16所述的系统,其中,所述调节电路被设置用于根据用电设备PD的功率要求,调节供电设备PSE的过载电流检测范围。 18. The system according to claim 16, wherein said adjusting circuit is provided for electrical apparatus according to power requirements of the PD, the PSE power supply equipment adjusting an overload current detection range.
19.根据权利要求16所述的系统,其中,所述限流电路响应由调节电路定义的限流阈值,用于限制供电设备PSE的输出电流。 19. The system according to claim 16, wherein the current limiting circuit response limit threshold defined by the adjusting circuit, the power supply apparatus for limiting an output current of the PSE.
20.根据权利要求16所述的系统,其中,所述调节电路被设置用于根据用电设备PD的功率要求,调节用电设备PD的输入限流阈值。 20. The system according to claim 16, wherein said adjusting circuit is provided according to the power requirements of the powered device PD, powered device PD adjusting an input current limit threshold.
21. 一种局域网,包括: 至少一对网络节点,网络集线器,和通信电缆,用于将所述网络节点连接到网络集线器以提供数据通信, 所述网络集线器具有供电设备,用于通过通信电缆向负载供电,所述网络具有: 功率要求决定电路,用于确定负载的功率要求,限流电路,用于监控系统中的电流,所述限流电路响应第一过流事件,以便根据为响应第一过流事件而定义的第一限流阈值限制电流,和限流调节机构,用于根据确定的用电设备PD功率要求调节第一限流阈值,以便为特定用电设备PD要求产生第一限流阈值的调节值,所述限流电路被提供第一限流阈值的调节值,以便根据第一限流阈值的调节值响应第一过流事件。 21. A local area network comprising: at least a pair of network nodes, a network hub, and communication cables for connecting the network nodes to the network hub to provide data communications, the network hub having a power supply device, through a communication cable for the power to the load network having: a power requirement determining circuit for determining the power requirement of the load, the current limiting circuit, the current monitoring system for a current limiting circuit responsive to a first overcurrent event, according to response a first current limit threshold value defining a first overcurrent limiting current event, and limiting the adjustment mechanism for adjusting the first requirement according to the determined current limit threshold of the PD electrical power to generate the first device for a particular PD power requirement a current limit value of the threshold adjustment, the current limiting circuit is adjusted to provide a first current limit value of the threshold value, in response to an overcurrent event in accordance with a first adjustment value of a first current limit threshold.
22.根据权利要求21所述的网络,其中,所述限流调节机构被设置用于根据负载的功率要求,确定供电设备的输出限流阈值。 22. A network according to claim 21, wherein said current limiting means is provided for adjustment according to the power requirements of the load, the power supply device determines the output current limit threshold.
23.根据权利要求21所述的网络,其中,所述限流调节机构被设置用于根据负载的功率要求,确定负载的输入限流阈值。 23. A network according to claim 21, wherein said current limiting means is provided for adjustment according to the power requirements of the load, determines a load of the input current limit threshold.
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CN 200680003192 CN101112042B (en) 2005-01-25 2006-01-09 Distinguishing network interface card from short circuit condition in power over Ethernet system
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CN 200680005463 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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CN200680003200.6A CN101116285B (en) 2005-01-25 2006-01-13 System, method and regional network with electricity provided by communication link
CN 200680003193 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
CN 200680005470 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
CN 200680005471 CN101124774A (en) 2005-01-25 2006-01-19 Power using delivery to power supply device between detection and classification mode
CN 200680005469 CN101124772B (en) 2005-01-25 2006-01-23 System for providing power over communication cable having mechanism for determining resistance of communication cable
CN 200680003199 CN101112043B (en) 2005-01-25 2006-01-23 System, method and LAN for controlling power distribution among multiple wires of communication cables
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