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CN101156355B - Detecting legacy powered devices in a power over ethernet system - Google Patents

  • ️Wed May 25 2011

CN101156355B - Detecting legacy powered devices in a power over ethernet system - Google Patents

Detecting legacy powered devices in a power over ethernet system Download PDF

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Publication number
CN101156355B
CN101156355B CN2006800093508A CN200680009350A CN101156355B CN 101156355 B CN101156355 B CN 101156355B CN 2006800093508 A CN2006800093508 A CN 2006800093508A CN 200680009350 A CN200680009350 A CN 200680009350A CN 101156355 B CN101156355 B CN 101156355B Authority
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detection
response
signal
legacy
value
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2005-01-25
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CN101156355A (en
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J·A·斯汀曼
J·L·奚斯
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Analog Devices International ULC
Linear Technology LLC
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Linear Technology LLC
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2005-01-25
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2005-10-19 Priority claimed from US11/252,607 external-priority patent/US7856561B2/en
2006-01-09 Application filed by Linear Technology LLC filed Critical Linear Technology LLC
2008-04-02 Publication of CN101156355A publication Critical patent/CN101156355A/en
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    • Y02B70/325—
    • Y02B70/3275—
    • Y02B90/2638—
    • Y02B90/2646—
    • Y02B90/2653—
    • Y02B90/2669—
    • Y04S20/228—
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/242—Home appliances
    • Y04S20/244—Home appliances the home appliances being or involving heating ventilating and air conditioning [HVAC] units
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
    • Y04S40/125—
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/128—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment involving the use of Internet protocol

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  • Small-Scale Networks (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Dc Digital Transmission (AREA)
  • Power Sources (AREA)
  • Tests Of Electronic Circuits (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

一种用于检测以太网供电(PoE)系统中用电设备(PD)的新型系统和方法。PD探查电路生成提供给P的检测信号并且确定响应所述检测信号而产生的PD响应信号。根据PD响应信号，控制电路确定检测值，用于识别PD。具体地讲，控制电路断定，如果检测值在第一预定范围内，则PD是满足Po标准的设备，并且断定如果检测值在第一预定范围之外的第二预定范围，则PD是传统的PD设备。

A novel system and method for detecting a powered device (PD) in a Power over Ethernet (PoE) system. A PD detection circuit generates a detection signal provided to P and determines a PD response signal generated in response to the detection signal. According to the PD response signal, the control circuit determines a detection value for identifying the PD. Specifically, the control circuit concludes that if the detected value is within a first predetermined range, the PD is a device satisfying the Po criterion, and concludes that the PD is a legacy device if the detected value is within a second predetermined range outside the first predetermined range. PD device.

Description

在以太网供电系统中检测传统用电设备 Detecting Legacy Consumers in Power over Ethernet Systems

本申请要求2005年1月25日提交的名称为“支持高级以太网供电系统的系统和方法(SYSTEM AND METHOD FOR SUPPORTING ADVANCED POWEROVER ETHERNET SYSTEM)”的美国临时专利申请第60/646,509号的优先权。This application claims priority to U.S. Provisional Patent Application No. 60/646,509, filed January 25, 2005, entitled "SYSTEM AND METHOD FOR SUPPORTING ADVANCED POWEROVER ETHERNET SYSTEM," filed January 25, 2005.

技术领域technical field

本发明涉及一种供电系统，更具体地讲，涉及用于检测以太网供电(PoE)系统中传统用电设备(PD)的电路和方法。The present invention relates to a power supply system, and more particularly, to a circuit and a method for detecting a traditional powered device (PD) in a Power over Ethernet (PoE) system.

背景技术Background technique

近年来，以太网已经成为局域网最常用的方法。IEEE 802.3组，以太网标准的发起人，已经开发出了该标准的延伸形式，称为IEEE 802.3af，定义通过以太网电缆供电。IEEE 802.3af标准定义了以太网供电(PoE)系统，涉及通过非屏蔽的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)。传统上，网络设备例如IP电话，无线LAN接入点，个人电脑和网络摄像头需要两个连接：一个连接到LAN，而另一个连接到供电系统。PoE系统消除了需要额外的插口和接线，以向网络设备供电。取而代之的是，通过用于数据传输的以太网电缆供电。In recent years, Ethernet has become the most common method for LANs. The IEEE 802.3 group, the originators of the Ethernet standard, has developed an extension of the standard called IEEE 802.3af, which defines power over Ethernet cables. The IEEE 802.3af standard defines a Power over Ethernet (PoE) system that involves the transmission of power over unshielded twisted-pair wires from a power sourcing equipment (PSE) to a powered device (PD) on the opposite side of the link. Traditionally, network devices such as IP phones, wireless LAN access points, personal computers and network cameras require two connections: one to the LAN and the other to the power supply. PoE systems eliminate the need for additional outlets and wiring to power network devices. Instead, power is supplied via the Ethernet cable used for data transmission.

如IEEE 802.3af标准所定义的，PSE和PD是非数据实体，允许网络设备使用与用于数据传输同类的电缆供电和获取电力。PSE是在物理连接点电连接到电缆的设备，它向链路供电。PSE通常与以太网开关，路由器，集线器或其它网络交换设备或中跨供电设备相连。PD是获得供电或请求供电的设备。PD可与例如数字IP电话，无线网络接入点，PDA或笔记本电脑系泊部位，手机充电器和HVAC恒温器等设备相连。As defined in the IEEE 802.3af standard, PSEs and PDs are non-data entities that allow network devices to be powered and drawn using the same cables that are used for data transmission. A PSE is a device electrically connected to the cable at the point of physical connection, which supplies power to the link. PSEs are usually connected to Ethernet switches, routers, hubs or other network switching devices or midspan power supply devices. A PD is a device that gets or requests power. PDs can interface with devices such as digital IP phones, wireless network access points, PDA or laptop docks, cell phone chargers and HVAC thermostats.

PSE的主要功能是为请求供电的PD搜寻链路，可选地对PD分级，如果探测到PD则向所述链路供电，监控链路上的供电，并且当不再请求和需要时切断电源。PD通过呈现由IEEE 802.3af标准所定义的PoE检测信号来参与PD检测程序。PD检测信号具有由PSE测量的电学特征，例如在19-26.5KΩ范围内的信号电阻。The main function of the PSE is to search for a link for a PD requesting power, optionally classify the PD, apply power to said link if a PD is detected, monitor the power on the link, and cut off power when it is no longer requested and needed . PDs participate in the PD detection procedure by presenting the PoE detection signal defined by the IEEE 802.3af standard. The PD detection signal has an electrical characteristic measured by the PSE, such as a signal resistance in the range of 19-26.5KΩ.

不过，在IEEE 802.3af标准批准之前制造的某些PD没有IEEE 802.3af标准检测信号。这些PD被称作传统PD。例如，一些传统PD可具有大电容和至少一个串联二极管作为它们的PoE检测信号。其它的传统PD可使用数据回送作为它的PoE检测信号。所述数据回送涉及不直接用于PD检测的线对之间的较小电容。However, some PDs manufactured before the IEEE 802.3af standard was ratified do not have the IEEE 802.3af standard detection signal. These PDs are called legacy PDs. For example, some legacy PDs may have a large capacitor and at least one series diode as their PoE detection signal. Other legacy PDs may use Data Echo as its PoE detection signal. The data loopback involves a small capacitance between wire pairs that are not directly used for PD detection.

尽管希望向传统的PD供电，但是它们在常规PD检测过程中不会被检测到。因此，需要支持检测传统PD的PD检测方案。Although it is desirable to provide power to conventional PDs, they will not be detected during conventional PD detection. Therefore, there is a need for a PD detection scheme that supports detection of legacy PDs.

发明内容Contents of the invention

本发明提供了新型的系统和方法，用于检测以太网供电(PoE)系统中的用电设备(PD)。PD探查电路生成提供给PD的检测信号并确定响应所述检测信号而产生的PD响应信号。根据PD响应信号，控制电路确定检测值用于识别PD。具体地讲，控制电路推断如果检测值在第一预定范围，则PD是满足PoE标准的设备，并且推断如果检测值是在第一预定范围之外的第二预定范围，则PD是传统的PD设备。The present invention provides novel systems and methods for detecting powered devices (PDs) in Power over Ethernet (PoE) systems. The PD detection circuit generates a detection signal provided to the PD and determines a PD response signal generated in response to the detection signal. According to the PD response signal, the control circuit determines a detection value for identifying the PD. Specifically, the control circuit deduces that if the detection value is within a first predetermined range, the PD is a PoE-compliant device, and deduces that if the detection value is within a second predetermined range outside the first predetermined range, the PD is a conventional PD equipment.

根据本发明的一个方面，所述控制电路可以将检测值和预定阈值作比较，以确定PD是否是传统设备。例如，如果检测值为负或者小于预定阈值，其中所述预定阈值可以小于第一预定范围的最小值，则识别PD为传统设备。According to an aspect of the present invention, the control circuit can compare the detection value with a predetermined threshold to determine whether the PD is a legacy device. For example, if the detection value is negative or less than a predetermined threshold, where the predetermined threshold may be less than a minimum value in a first predetermined range, then identify the PD as a legacy device.

根据本发明的实施例，所述检测值可包括检测电阻值。控制电路可以确定PD是传统的PD设备，如果检测电阻值为负或者小于阈值电阻值。所述阈值电阻值可以小于IEEE 802.3af标准中定义的信号电阻的最小可接受值。According to an embodiment of the present invention, the detection value may include a detection resistance value. The control circuit can determine that the PD is a conventional PD device if the detection resistance value is negative or less than the threshold resistance value. The threshold resistance value may be less than the minimum acceptable value of signal resistance defined in the IEEE 802.3af standard.

PD探查电路可以产生第一检测电流，随后是小于第一检测电流的第二检测电流。如果响应第一电流所产生的第一响应电压小于响应第二电流所产生的第二响应电压，则控制电路可检测到传统的PD设备。The PD detection circuit may generate a first detection current followed by a second detection current that is less than the first detection current. If the first response voltage generated in response to the first current is smaller than the second response voltage generated in response to the second current, the control circuit may detect a conventional PD device.

另外，如果第一响应电压大于第二响应电压，但这些电压之间的差值小于预设的阈值，则控制电路可检测到传统的PD设备。In addition, if the first response voltage is greater than the second response voltage, but the difference between these voltages is less than a preset threshold, the control circuit can detect a conventional PD device.

例如，当由第一响应电压和第二响应电压之间的差值定义的检测电阻值为负或小于预定的阈值电阻值，其可以小于由PoE标准定义的最小信号电阻值，则控制电路可检测到传统设备。For example, when the sense resistance value defined by the difference between the first response voltage and the second response voltage is negative or less than a predetermined threshold resistance value, which may be less than the minimum signal resistance value defined by the PoE standard, the control circuit may Legacy device detected.

根据本发明的方法，执行下述步骤来检测PoE系统中的PD：According to the method of the present invention, the following steps are performed to detect the PD in the PoE system:

-产生提供给PD的检测信号，以确定PD响应信号，和- generating a detection signal provided to the PD to determine a PD response signal, and

-根据PD响应信号，如果检测值在第一预定范围则确定PD是满足PoE标准的设备，和如果检测值在第一范围之外的第二预定范围则确定PD是传统PD设备。- According to the PD response signal, determining that the PD is a device meeting the PoE standard if the detection value is within a first predetermined range, and determining that the PD is a legacy PD device if the detection value is within a second predetermined range outside the first range.

产生检测信号的步骤可包括产生第一检测信号，随后是具有比第一检测信号更小值的第二检测信号。当由响应第一检测信号所产生的第一响应信号和响应第二检测信号所产生的第二响应信号之间的差值定义的检测电阻值为负或小于阈值电阻值，则检测到传统设备。The step of generating the detection signal may include generating a first detection signal followed by a second detection signal having a smaller value than the first detection signal. A legacy device is detected when the detection resistance value defined by the difference between the first response signal generated in response to the first detection signal and the second response signal generated in response to the second detection signal is negative or less than the threshold resistance value .

对于本领域的技术人员来说，本发明的其他优点和方面将通过下述详细说明而变得显而易见，其中示出和描述了本发明的实施例，只是通过示出实现本发明的最佳模式。如下文所述，本发明可具有其它和不同的实施例，并且它的若干细节可在不背离本发明精神的前提下在各种不同的方面进行改进。因此，附图和说明应当被认为是描述性的，而非限制性的。Other advantages and aspects of the present invention will become apparent to those skilled in the art from the following detailed description, which shows and describes embodiments of the invention, merely by way of illustration of the best mode of carrying out the invention. . As hereinafter described, the invention is capable of other and different embodiments, and its several details can be modified in various respects, all without departing from the spirit of the invention. Accordingly, the drawings and descriptions should be regarded as descriptive rather than restrictive.

附图说明Description of drawings

结合下述附图可以最好的理解本发明实施例的下述详细说明，其中特征不必要按照比例绘制，而是以最佳示出相关特征的形式绘制，其中：The following detailed description of embodiments of the invention is best understood when taken in conjunction with the following drawings, wherein features are not necessarily drawn to scale, but rather are drawn in a form that best illustrates the relevant feature, in which:

图1是示出根据本发明用于检测PD的示例性系统的方框图。FIG. 1 is a block diagram illustrating an exemplary system for detecting PD according to the present invention.

图2是检测源的诺顿(Norton)等效电路。Figure 2 is the Norton equivalent circuit of the detection source.

图3是流程图，示出用于控制检测传统PD的系统操作的控制算法。FIG. 3 is a flowchart illustrating a control algorithm for controlling the operation of a system for detecting legacy PDs.

具体实施方式Detailed ways

本发明将以检测PoE系统中传统PD为例进行说明。不过，显而易见，本文描述的构思可用于识别由供电系统供电的任何可连接设备。The present invention will be described by taking detection of a traditional PD in a PoE system as an example. It should be apparent, however, that the concepts described herein can be used to identify any connectable device powered by a power supply system.

图1示出了在PoE系统中的本发明的PD检测系统10的简化方框图，包括PSE 12，和通过链路16可连接到PSE 12的PD 14，所述链路例如是在IEEE802.3af标准中定义的2-线链路。PD检测系统10包括检测源18和控制器20，可安置在PSE 12中。Figure 1 shows a simplified block diagram of a PD detection system 10 of the present invention in a PoE system, comprising a PSE 12, and a PD 14 connectable to the PSE 12 via a link 16, such as in the IEEE802.3af standard 2-wire link defined in . PD detection system 10 includes a detection source 18 and a controller 20, which may be housed in PSE 12.

检测源18可以是强制电流检测源，它产生提供给PD 14的检测电流Idet并且确定响应检测电流所产生的电压Vres。控制器20可以是设置在PSE12中的状态机或微控制器。Sensing source 18 may be a forced current sensing source that generates a sensing current Idet supplied to PD 14 and determines a voltage Vres generated in response to the sensing current. The controller 20 may be a state machine or a microcontroller provided in the PSE 12 .

图2示出检测源18的诺顿等效电路，它包括电流源22，与电流源22并联连接的源电阻Rsc，和与源电阻Rsc并联连接的电压监控器24。FIG. 2 shows a Norton equivalent circuit of sense source 18, which includes a current source 22, a source resistance Rsc connected in parallel with current source 22, and a voltage monitor 24 connected in parallel with source resistance Rsc.

在检测PD 14的每次测试中，检测源18产生检测电流Idet，它可对应IEEE 802.3af标准中定义的电压范围在2.8V-10V的检测电压Vdet。源电阻Rsc的范围在100Kohm-100Mohm。不同检测测试所产生的检测电流Idet的值之间的最小电流差值对应1V的Vdet电压差。In each test of detecting the PD 14, the detection source 18 generates a detection current Idet, which can correspond to the detection voltage Vdet defined in the IEEE 802.3af standard with a voltage range of 2.8V-10V. The range of source resistance Rsc is 100Kohm-100Mohm. The minimum current difference between the values of the detection current Idet generated by different detection tests corresponds to a Vdet voltage difference of 1V.

电压监控器24确定响应提供给PD14的检测电流Idet所产生的电压Vres。PD 14的检测电阻Rdet确定为：Voltage monitor 24 determines a voltage Vres generated in response to sense current Idet supplied to PD 14 . The detection resistor Rdet of PD 14 is determined as:

Rdet＝ΔVres/ΔIdet，Rdet=ΔVres/ΔIdet,

其中ΔIdet是不同测试中检测电流之间的差值，而ΔVres是响应各自检测电流所产生的电压之间的差值。where ΔIdet is the difference between the sense currents in different tests, and ΔVres is the difference between the voltages generated in response to the respective sense currents.

图3是流程图，示出了由控制器24执行的控制算法，使得PD检测系统10能够检测传统PD，其中所述传统PD可以是不具有IEEE 802.3af标准所要求的检测信号的PD。例如，一些传统PD可具有大电容和至少一个串联二极管作为它们的PoE检测信号。其它传统PD可使用数据回送作为其PoE检测信号。这种数据回送涉及不直接用于PD检测的线对之间的较小电容。FIG. 3 is a flowchart illustrating a control algorithm executed by the controller 24 to enable the PD detection system 10 to detect legacy PDs, where the legacy PDs may be PDs that do not have the detection signal required by the IEEE 802.3af standard. For example, some legacy PDs may have a large capacitor and at least one series diode as their PoE detection signal. Other legacy PDs may use data loopback as their PoE detection signal. This data loopback involves a small capacitance between wire pairs that are not directly used for PD detection.

PD检测程序开始(步骤102)之后，控制器20请求检测源18生成检测电流I1。例如，可产生240mA的电流。在预设的等待时间例如等于160ms之后，控制检测源18，以使电压监控器24能够测量响应提供给PD 14的电流I1所产生的电压V1(步骤104)。After the PD detection procedure starts (step 102 ), the controller 20 requests the detection source 18 to generate a detection current I 1 . For example, a current of 240mA can be generated. After a preset waiting time, eg equal to 160 ms, the detection source 18 is controlled to enable the voltage monitor 24 to measure the voltage V 1 generated in response to the current I 1 supplied to the PD 14 (step 104 ).

此后，控制器20请求检测源18生成小于电流I1的检测电流I2。例如，电流I2可以等于180mA。在预设的等待时间例如等于160ms之后，请求电压监控器24测量响应提供给PD 14的电流I2而产生的电压V2(步骤106)。Thereafter, the controller 20 requests the detection source 18 to generate a detection current I 2 smaller than the current I 1 . For example, current I2 may be equal to 180mA. After a preset waiting time equal to, for example, 160 ms, the voltage monitor 24 is requested to measure the voltage V 2 generated in response to the current I 2 supplied to the PD 14 (step 106 ).

根据测量的响应电压V1和V2，在步骤108控制器20计算PD 14的检测电阻Rdet如下：Based on the measured response voltages V 1 and V 2 , at step 108 controller 20 calculates detection resistance Rdet of PD 14 as follows:

Rdet＝(V1-V2)/(I1-I2)，Rdet=(V 1 -V 2 )/(I 1 -I 2 ),

并确定所计算的检测电阻Rdet是否在IEEE 802.3af标准可接受的范围内，例如17KΩ-30KΩ(步骤110)。如果是，控制器20推断PD14是符合IEEE 802.3af标准的设备(步骤112)。And determine whether the calculated detection resistance Rdet is within the acceptable range of IEEE 802.3af standard, such as 17KΩ-30KΩ (step 110). If so, controller 20 infers that PD 14 is an IEEE 802.3af compliant device (step 112).

如果所计算的检测电阻Rdet在IEEE 802.3af标准可接受的范围之外，则控制器20确定PD14是可由PSE 12供电的传统设备。例如，如果PD 14是具有大电容(例如大于47μF)和二极管与该电容串联的传统设备，由于对大电容的充电，第二测量的电压V2会大于电压V1。如果电容非常大，则两个测量的电压V1和V2会具有几乎相同的值。这些电压之间的差值会被限制为由串联二极管两端的正向压降导致的补偿电压。If the calculated sense resistance Rdet is outside the acceptable range of the IEEE 802.3af standard, the controller 20 determines that the PD 14 is a legacy device that can be powered by the PSE 12 . For example, if PD 14 is a conventional device with a large capacitance (eg, greater than 47 μF) and a diode in series with the capacitance, the second measured voltage V 2 will be greater than voltage V 1 due to charging the large capacitance. If the capacitance is very large, the two measured voltages V1 and V2 will have almost the same value. The difference between these voltages is limited to the compensation voltage caused by the forward voltage drop across the series diodes.

如果PD 14是具有较小电容(例如在1μF-33μF的范围内)和电阻与该电容并联的传统设备，则根据电容的大小，电阻值，所产生的检测电流I1和I2的值，以及电压V1和V2测量之间的时间段，第二测量的电压V2可能大于或可能不大于电压V1。不过，利用由电容充电时电容和并联电阻的组合所产生的补偿电压所导致的电压V1和V2之间的差值，可以识别所连接的PD 14是传统设备。If the PD 14 is a conventional device with a small capacitance (eg, in the range of 1 μF-33 μF) and a resistor connected in parallel with the capacitance, then according to the size of the capacitance, the value of the resistance, the values of the generated detection currents I1 and I2 , As well as the time period between voltage V 1 and V 2 measurements, the second measured voltage V 2 may or may not be greater than voltage V 1 . However, the connected PD 14 can be identified as a legacy device by using the difference between the voltages V1 and V2 resulting from the compensation voltage generated by the combination of the capacitor and the parallel resistance when the capacitor is charged.

因此，如果响应小于第一检测电流I1的第二检测电流I2而产生的第二测量电压V2大于第一测量电压V1，则控制器20可断定所连接的PD14是传统设备。Therefore, if the second measured voltage V 2 generated in response to the second sensed current I 2 which is less than the first sensed current I 1 is greater than the first measured voltage V 1 , the controller 20 may conclude that the connected PD 14 is a legacy device.

此外，如果电压V1大于电压V2，控制器20可将这些电压之间的差值与预选的阈值电压作比较，其中所述预选的阈值电压对应响应连续提供的检测电流I1和I2而产生的补偿电压。如果电压V1和V2之间的差小于阈值电压，控制器20可断定所连接的PD 14为传统设备。Additionally, if voltage V 1 is greater than voltage V 2 , controller 20 may compare the difference between these voltages to a preselected threshold voltage corresponding to the sense currents I 1 and I 2 provided in succession. The resulting compensation voltage. If the difference between voltages V 1 and V 2 is less than the threshold voltage, controller 20 may conclude that connected PD 14 is a legacy device.

根据本发明的实施例，如果步骤108中计算的检测电阻Rdet在IEEE802.3af标准可接受的范围之外，则控制器20将检测电阻与对应预选阈值电压的阈值电阻Rth作比较，以检测可连接至PSE 12的传统用电设备(步骤114)。例如，阈值电阻Rth可等于6KΩ。According to an embodiment of the present invention, if the detection resistance Rdet calculated in step 108 is outside the acceptable range of the IEEE802.3af standard, the controller 20 compares the detection resistance with the threshold resistance Rth corresponding to the preselected threshold voltage to detect an acceptable Legacy powered devices connected to PSE 12 (step 114). For example, the threshold resistance Rth may be equal to 6KΩ.

如果检测电阻Rdet小于阈值电阻Rth，或为负值(表示电压V2大于电压V1)，则控制器20断定所连接的PD 14是可由PSE 12供电的传统设备(步骤116)。如果检测电阻Rdet不是负值或不小于阈值电阻Rth，则控制器20确定所连接的设备既不是符合IEEE 802.3af标准的PD，也不是可由PSE 12供电的传统PD(步骤118)。If the sense resistor Rdet is less than the threshold resistor Rth, or is negative (indicating that the voltage V 2 is greater than the voltage V 1 ), the controller 20 concludes that the connected PD 14 is a legacy device that can be powered by the PSE 12 (step 116 ). If the detection resistance Rdet is not negative or less than the threshold resistance Rth, the controller 20 determines that the connected device is neither an IEEE 802.3af compliant PD nor a legacy PD that can be powered by the PSE 12 (step 118).

因此，除IEEE 802.3af标准可接受的第一检测电阻范围之外，控制器20检查预选的第二检测电阻范围，以检测可连接到PSE 12的传统设备。如上所述，第二检测范围可以覆盖，例如，负值的检测电阻或值，小于预定的阈值电阻。如果所连接的PD 14的检测电阻Pdet在第二范围内，所连接的PD 14被认为是传统设备。结果，PSE 12不仅能够检测符合IEEE 802.3af标准的用电设备，还可以检测需要供电的传统设备。Accordingly, the controller 20 checks a preselected second sense resistor range to detect legacy devices connectable to the PSE 12 in addition to the first sense resistor range acceptable to the IEEE 802.3af standard. As mentioned above, the second detection range may cover, for example, negative values of the sense resistance or values, which are less than a predetermined threshold resistance. If the sense resistor Pdet of the connected PD 14 is within the second range, the connected PD 14 is considered a legacy device. As a result, PSE 12 is capable of detecting not only IEEE 802.3af compliant powered devices, but also legacy devices requiring power.

前述说明示出和描述了本发明的方面。此外，本发明只示出和描述了优选的实施例，但如前所述，应当理解，本发明能够用于各种其它的组合，改进，和环境，并且可在本文表述的本发明构思范围内进行修改和改进，与上述教导，和/或相关领域的技术或知识范围相当。The foregoing specification illustrates and describes aspects of the invention. In addition, the present invention only shows and describes the preferred embodiment, but as mentioned above, it should be understood that the present invention can be used in various other combinations, modifications, and environments, and can be used within the scope of the inventive concept expressed herein Modifications and improvements commensurate with the above teachings, and/or within the skill or knowledge of the relevant art.

上文描述的实施例还进一步用于解释实现本发明的最佳模式，并且可使本领域的技术人员通过以该方式或其它实施方式实现本发明，并根据本发明的特殊应用或用途的需要进行各种修改。The above-described embodiments are further used to explain the best mode for realizing the present invention, and enable those skilled in the art to realize the present invention in this manner or other implementation manners, and according to the needs of the special application or purpose of the present invention Make various modifications.

因此，本说明书并非倾向于将本发明限定为本文公开的形式。另外，所附权利要求书应当被理解为包括可替换的实施例。Accordingly, the description is not intended to limit the invention to the form disclosed herein. Additionally, the appended claims should be construed to cover alternative embodiments.

Claims (20)

1.一种用于向以太网供电(PoE)系统中的用电设备(PD)供电的系统，包括：1. A system for supplying power to a powered device (PD) in a Power over Ethernet (PoE) system, comprising: PD探查电路，用于向PD提供第一检测电流，随后是小于第一检测电流的第二检测电流，并确定为响应第一检测电流而产生的第一响应电压，和为响应第二检测电流而产生的第二响应电压，和a PD detection circuit for supplying a first detection current to the PD, followed by a second detection current less than the first detection current, and determining a first response voltage generated in response to the first detection current, and a first response voltage generated in response to the second detection current while generating the second response voltage, and 控制电路，用于检测利用电容作为检测信号的传统PD，所述控制电路根据第一响应电压和第二响应电压之间的差值来检测传统PD。The control circuit is used to detect the conventional PD using the capacitance as the detection signal, and the control circuit detects the conventional PD according to the difference between the first response voltage and the second response voltage. 2.根据权利要求1所述的系统，其中，所述控制电路被设置：2. The system of claim 1, wherein the control circuit is arranged to: 以确定PD是否是符合PoE标准的设备，和to determine if the PD is a PoE compliant device, and 如果PD不是符合PoE标准的设备，则确定PD是否是传统PD。If the PD is not a PoE standard compliant device, it is determined whether the PD is a legacy PD. 3.根据权利要求1所述的系统，其中，所述控制电路被设置通过将由第一响应电压和第二响应电压之间的差值定义的检测值与预定的阈值作比较，来检测传统PD。3. The system of claim 1, wherein the control circuit is arranged to detect a legacy PD by comparing a detection value defined by a difference between the first response voltage and the second response voltage to a predetermined threshold . 4.根据权利要求1所述的系统，其中，所述控制电路被设置当第一响应电压和第二响应电压之间的差值为负值时，检测到传统PD。4. The system of claim 1, wherein the control circuit is configured to detect a legacy PD when the difference between the first response voltage and the second response voltage is negative. 5.根据权利要求1所述的系统，其中，所述控制电路被设置当第一响应电压大于第二响应电压，并且由第一响应电压和第二响应电压之间的差值定义的检测值小于预定的阈值时，检测到传统PD。5. The system according to claim 1, wherein the control circuit is configured to detect a value defined by the difference between the first response voltage and the second response voltage when the first response voltage is greater than the second response voltage When less than a predetermined threshold, conventional PD is detected. 6.根据权利要求1所述的系统，其中，所述控制电路被设置当由第一响应电压和第二响应电压之间的差值定义的检测电阻值小于预定的阈值电阻值时，检测到传统PD。6. The system of claim 1, wherein the control circuit is configured to detect Traditional PD. 7.根据权利要求6所述的系统，其中，所述预定的阈值电阻值小于由PoE标准定义的最小信号电阻值。7. The system of claim 6, wherein the predetermined threshold resistance value is less than a minimum signal resistance value defined by a PoE standard. 8.一种向以太网供电(PoE)系统中的用电设备(PD)供电的方法，包括如下步骤：8. A method of supplying power to a powered device (PD) in a Power over Ethernet (PoE) system, comprising the steps of: 产生提供给PD的第一检测信号，随后是比第一检测信号具有更小值的第二检测信号，以确定为响应第一检测信号而产生的第一响应信号，和为响应第二检测信号而产生的第二响应信号，和generating a first detection signal to the PD, followed by a second detection signal having a smaller value than the first detection signal, to determine a first response signal generated in response to the first detection signal, and a first response signal generated in response to the second detection signal while generating the second response signal, and 根据由第一响应信号和第二响应信号之间的差值定义的检测值，确定如果检测值在第一预定范围，则PD是满足PoE标准的设备；According to the detection value defined by the difference between the first response signal and the second response signal, determine if the detection value is within the first predetermined range, then the PD is a device meeting the PoE standard; 如果检测值在第一预定范围之外，根据检测值，确定PD是否是利用电容作为检测信号的传统设备。If the detection value is outside the first predetermined range, according to the detection value, it is determined whether the PD is a conventional device using capacitance as a detection signal. 9.根据权利要求8所述的方法，其中，当检测值小于预定值时，检测到传统设备。9. The method of claim 8, wherein a legacy device is detected when the detection value is less than a predetermined value. 10.根据权利要求9所述的方法，其中，所述预定值小于由PoE标准定义的最小信号电阻值。10. The method of claim 9, wherein the predetermined value is less than a minimum signal resistance value defined by a PoE standard. 11.根据权利要求8所述的方法，其中，当检测值为负值时，检测到传统设备。11. The method of claim 8, wherein when the detection value is negative, a legacy device is detected. 12.根据权利要求8所述的方法，其中，当第一响应信号小于第二响应信号时，检测到传统设备。12. The method of claim 8, wherein a legacy device is detected when the first response signal is smaller than the second response signal. 13.根据权利要求8所述的方法，其中，当第一响应信号大于第二响应信号，并且第一响应信号和第二响应信号之间的差值小于预设的阈值时，检测到传统设备。13. The method of claim 8, wherein a legacy device is detected when the first response signal is greater than the second response signal and the difference between the first response signal and the second response signal is less than a preset threshold . 14.一种以太网供电(PoE)系统的供电设备(PSE)，包括：14. A power supply equipment (PSE) for a Power over Ethernet (PoE) system, comprising: 用电设备(PD)检测源，用于产生提供给PD的第一检测电流，以确定第一响应电压，和用于产生小于第一检测电流的第二检测电流，以确定第二响应电压，和a powered device (PD) detection source for generating a first detection current supplied to the PD to determine a first response voltage, and for generating a second detection current smaller than the first detection current to determine a second response voltage, and 检测电路，用于检测利用电容作为检测信号的传统PD，所述检测电路根据由第一响应电压值减去第二响应电压值的结果定义的检测电阻值来确定PD是传统PD。A detection circuit for detecting a legacy PD using capacitance as a detection signal, the detection circuit determining that the PD is a legacy PD based on a detection resistance value defined by a result of subtracting a second response voltage value from the first response voltage value. 15.根据权利要求14所述的PSE，其中，当检测电阻值是负值时，检测到传统的PD。15. The PSE of claim 14, wherein a legacy PD is detected when the sense resistor value is negative. 16.根据权利要求14所述的PSE，其中，所述检测电路还被设置当检测电阻值是在要求的信号电阻范围内时，检测满足IEEE 802.3标准要求的PD。16. The PSE according to claim 14, wherein the detection circuit is further configured to detect a PD meeting the requirements of the IEEE 802.3 standard when the detection resistance value is within the required signal resistance range. 17.根据权利要求14所述的PSE，其中，当检测电阻值小于预定值，而所述预定值小于由IEEE802.3标准定义的最小信号电阻值时，检测到传统PD。17. The PSE of claim 14, wherein the legacy PD is detected when the detection resistance value is less than a predetermined value, and the predetermined value is less than a minimum signal resistance value defined by the IEEE802.3 standard. 18.根据权利要求1所述的系统，其中，所述控制电路被设置以检测由用于供电的系统进行供电的传统PD。18. The system of claim 1, wherein the control circuit is configured to detect a legacy PD powered by a system for power supply. 19.根据权利要求8所述的方法，其中，所述传统设备是由PoE系统中的供电设备进行供电的设备。19. The method of claim 8, wherein the legacy device is a device powered by a power supply device in a PoE system. 20.根据权利要求14所述的PSE，其中，所述控制电路被设置以检测由PSE供电的传统PD。20. The PSE of claim 14, wherein the control circuit is configured to detect a legacy PD powered by the PSE.

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