US20150042243A1 - POWER-OVER-ETHERNET (PoE) CONTROL SYSTEM - Google Patents

POWER-OVER-ETHERNET (PoE) CONTROL SYSTEM Download PDF

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Publication number
US20150042243A1
US20150042243A1 US14/448,753 US201414448753A US2015042243A1 US 20150042243 A1 US20150042243 A1 US 20150042243A1 US 201414448753 A US201414448753 A US 201414448753A US 2015042243 A1 US2015042243 A1 US 2015042243A1
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Prior art keywords
class
poe
voltage signal
power level
signature
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US14/448,753
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English (en)
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Jean Picard
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Texas Instruments Inc
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Texas Instruments Inc
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Priority to US14/448,753 priority Critical patent/US20150042243A1/en
Assigned to TEXAS INSTRUMENTS INCORPORATED reassignment TEXAS INSTRUMENTS INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PICARD, JEAN
Priority to CN201910280039.6A priority patent/CN110071817B/zh
Priority to PCT/US2014/050568 priority patent/WO2015021475A1/en
Priority to EP14834395.7A priority patent/EP3031171B1/en
Priority to JP2016533495A priority patent/JP6445558B2/ja
Priority to CN201480042866.7A priority patent/CN105453484A/zh
Publication of US20150042243A1 publication Critical patent/US20150042243A1/en
Priority to US15/865,441 priority patent/US11012247B2/en
Priority to JP2018223558A priority patent/JP6916429B2/ja
Priority to US17/227,166 priority patent/US11855790B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/10—Current supply arrangements
    • H05B37/0272—
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/175—Controlling the light source by remote control
    • H05B47/19—Controlling the light source by remote control via wireless transmission

Definitions

  • This disclosure relates generally to electronic systems, and more specifically to a power-over-Ethernet (PoE) control system.
  • PoE power-over-Ethernet
  • PoE Power-over-Ethernet
  • PD powered device
  • PSE power sourcing equipment
  • the process proceeds through an idle state and three operational states of detection, classification, and operation.
  • the PSE can leave the cable unpowered in the idle state while it periodically looks to see if a PD has been plugged-in.
  • the low-power levels that can be used during detection are unlikely to damage devices not designed for PoE.
  • the PSE may inquire as to how much power the PD requires. The PSE may then provide the required power to the PD if it has sufficient power providing capacity.
  • PoE power-over-Ethernet
  • the system includes a powered device (PD) that is configured to receive a voltage signal via an Ethernet connection and which comprises a PoE signal receiver configured to indicate a nominal power level via the received voltage signal.
  • the system also includes a power sourcing equipment (PSE) device configured to generate the voltage signal and to measure a class current of the voltage signal to determine the nominal power level.
  • the PSE device includes a PoE controller configured to provide a power setting command as a function of the nominal power level to the PoE signal receiver via the voltage signal, such that the PD can operate at a power level that is based on the power setting command.
  • Another example includes a method for providing power control in a PoE control system.
  • the method includes providing event classifications of a voltage signal via an Ethernet connection from a PSE device.
  • the method also includes indicating a nominal power level based on a class signature via a PoE signal receiver of a powered device (PD) based on a class current of the voltage signal.
  • the method also includes providing a power setting command associated with a quantity of class events of the voltage signal from the PSE device to the PoE signal receiver.
  • the power setting command can correspond to a percentage of the nominal power level.
  • the method further includes activating the PD to operate at the percentage of the nominal power level based on the power setting command.
  • the system includes a powered device (PD) that is configured to receive a voltage signal via an Ethernet connection and which comprises a PoE signal receiver configured to provide a first class signature in response to a first event classification via a class current of the received voltage signal and a second class signature via the class current, the second class signature having a different class value from the first class signature, and a third class signature that has a class value that is less than the second class signature to indicate that the PD has a capacity for PoE control.
  • the third class signature can indicate a nominal power level of the PD.
  • the system further includes a PSE device configured to generate the voltage signal and to measure the class current of the voltage signal to determine the capacity for PoE control and the nominal power level.
  • the PSE device includes a PoE controller configured to provide a power setting command as a function of the nominal power level to the PoE signal receiver via the voltage signal, such that the PD can operate at a power level that is based on the power setting command.
  • FIG. 1 illustrates an example of a power-over-Ethernet (PoE) control system.
  • PoE power-over-Ethernet
  • FIG. 2 illustrates another example of a PoE control system.
  • FIG. 3 illustrates an example of a timing diagram
  • FIG. 4 illustrates yet another example of a PoE control system.
  • FIG. 5 illustrates another example of a timing diagram.
  • FIG. 6 illustrates an example of a method for providing power control in a PoE control system.
  • a PoE control system can include a power sourcing equipment (PSE) device and a powered device (PD) that are electrically coupled via an Ethernet connection, such as an RJ-45 cable.
  • PSE power sourcing equipment
  • PD powered device
  • the PSE device includes a PoE controller and is configured to provide a voltage signal that can vary in amplitude depending on the phase of PoE control.
  • the PD can include a PoE signal receiver that is configured as a current source in response to the voltage signal provided by the PSE device.
  • the PoE controller can monitor the class current of the voltage signal to determine class signatures.
  • the PD can include a PoE signal receiver to indicate to the PSE device that the PD has a capacity for PoE control, and can indicate a nominal power level of the PD to the PSE device via the class current of the voltage signal. Therefore, the PSE device can provide pulses via the voltage signal as a power setting command to the PD, such that the PD can operate at a power level that is based on the power setting command.
  • the PSE device can operate in a classification phase subsequent to a detection phase during which the PSE device determines if the PD is connected, the PSE device can operate in a classification phase.
  • the PSE device can provide the voltage signal at a classification amplitude to provide event classifications that include one or more class events and corresponding mark events (e.g., in a 1-Event or 2-Event classification scheme) via the voltage signal to the PD, such that the PD can control the class current of the voltage signal to provide respective class signatures to the PSE device.
  • the PD can provide a first class signature and a second class signature, with the first and second class signatures being different.
  • the PD can provide a third class signature to the PSE device that is less than the second class signature to indicate the capacity for PoE control by the PSE device.
  • the third class signature can indicate a nominal power level of the PD to the PSE device.
  • the third class signature can have a value corresponding to one of a plurality of predetermined nominal power levels, such that the PSE device can identify the nominal power level based on the value of the third class signature.
  • the PSE device can provide a number of class events that can correspond to a code corresponding to the power setting command, with the quantity of pulses corresponding a predetermined percentage of the nominal power level.
  • the PSE device can provide the voltage signal in the activation phase at a maximum amplitude, such that the PD can operate at the percentage of the nominal power level based on the power command setting.
  • the PoE control system described herein can operate to provide physical (PHY) layer power control of the PD in a simplistic and variable manner.
  • FIG. 1 illustrates an example of a power-over-Ethernet (PoE) control system 10 .
  • the PoE control system 10 can be implemented in a variety of power-providing applications, such as illumination.
  • the PoE control system 10 can be implemented to provide power control via existing Ethernet cables (e.g., RJ-45 cables) without Ethernet data communication capability (e.g., utilizing data/link layers, packetization, etc.).
  • the PoE control system 10 provides PoE power control in a physical (PHY) layer manner.
  • PHY physical
  • the PoE control system 10 includes a power sourcing equipment (PSE) device 12 and a powered device (PD) 14 that are electrically coupled via an Ethernet connection 16 .
  • the Ethernet connection 16 can be an RJ-45 cable that implements twisted pair conductors (e.g., four twisted pairs).
  • the PSE device 12 is configured to provide a voltage signal V PORT to the powered device via the Ethernet connection 16 to implement bilateral communication between the PSE device 12 and the PD 14 .
  • the voltage V PORT can correspond to a fixed voltage V POE that is generated in the PSE device 12 and which is modulated in amplitude.
  • the PD 14 can be configured as a Type 2 PD according to the IEEE 802.3 standard.
  • the voltage signal V PORT can correspond to a voltage signal that varies to provide event classifications from the PSE device 12 to the PD 14 in an event classification scheme, such that the PD 14 can respond to the class events by varying the current of the voltage signal V PORT to provide a class signature to the PSE device 12 , such as based on the IEEE 802.3 standard.
  • event classification describes the PSE device 12 providing one or more class events and corresponding mark events to the PD 14 to provide communication to and/or to elicit a communication response from the PD 14 in the form of a class signature.
  • class event describes a pulse of the voltage signal V PORT at a predetermined amplitude, and which is followed by a mark event (e.g., decreased voltage subsequent to the pulse) that signifies an end of the class event.
  • class signature refers to a response by the PD 14 of an event classification that includes the one or more class events in the form of a magnitude of class current that corresponds to a class level, described herein as Class 0 through Class 5, with the class values corresponding to increasing amplitudes of the class current in ascending order of class value.
  • the PSE device 12 includes a PoE controller 18
  • the PD 14 includes a PoE signal receiver 20
  • the PoE controller 18 can be configured to control an activation time and an amplitude of the voltage signal V PORT , such as based on a given operating phase of the PoE control system 10 , to provide communication to the PD 14 .
  • the PoE controller 18 can also be configured to measure the class current associated with the voltage signal V PORT , and thus to determine the class level of a class signature.
  • the PoE signal receiver 20 can be configured to receive the voltage signal V PORT and to act as a class current source with respect to the voltage signal V PORT , such that the PoE signal receiver 20 can adjust the class current of the voltage signal V PORT to provide communication to the PSE device 12 in response to the voltage signal V PORT .
  • the PoE controller 18 can implement the communication with the PoE signal receiver 20 via a standard, such as IEEE 802.3.
  • the PoE controller 18 can be configured to provide event classifications as a 1-Event Physical Layer classification to provide a single class event, or as a 2-Event Physical Layer classification to provide a series (e.g., two) of class events followed by respective mark events.
  • the PD 14 can provide a corresponding class signature.
  • the PSE device 12 can initially operate in a detection phase, such that the PSE device 12 can provide the voltage signal V PORT at a valid test voltage amplitude (e.g., between approximately 2.8 volts and approximately 10 volts) at periodic intervals. If the PD 14 is electrically coupled to the PSE device 12 via the Ethernet connection 16 , the PoE signal receiver 20 can respond by providing a sufficient resistance with respect to the voltage signal V PORT to indicate to the PSE device 12 that the PD 14 is coupled via the Ethernet connection 16 . Subsequent to the detection phase, the PSE device 12 switches to a classification phase.
  • a valid test voltage amplitude e.g., between approximately 2.8 volts and approximately 10 volts
  • the PSE device 12 can provide the voltage signal V PORT at a classification amplitude (e.g., between approximately 15.5 volts and approximately 20.5 volts) to provide class events (e.g., 1-Event classifications and/or 2-Event classifications) via the voltage signal V PORT to the PD 14 , as controlled by the PoE controller 18 .
  • class events e.g., 1-Event classifications and/or 2-Event classifications
  • the PoE signal receiver 20 can control the class current of the voltage signal V PORT to provide respective class signature to the PSE device 12 , such that each class signature has a range of class current amplitudes that corresponds to a predetermined Class (e.g., as dictated by IEEE 802.3at).
  • the PoE controller 18 can measure the class current of the voltage signal V PORT in each class event, such that the PoE controller 18 can determine the class signature provided by the PoE signal receiver 20 . Accordingly, as described herein, the PSE device 12 and the PD 14 can communicate with each other.
  • the PoE signal receiver 20 can provide a first class signature in response to a first event classification, followed by a second class signature in response to a second event classification, and a third class signature in response to a third event classification.
  • the PoE signal receiver 20 can provide the second class signature at a different class (e.g., at a greater current) than the first class signature, and can provide the third class signature at a class less than the second class signature to indicate the capacity for PoE control of the PD 14 by the PSE device 12 .
  • the first class signature can be provided at Class 4 (e.g., in response to each of two class events of the first event classification), the second class signature can be provided at Class 5, and the third class signature can be provided at a range of classes less than Class 5 (e.g., Class 0-4).
  • Class 5 with respect to a class signature is defined as a class signature having a higher class current than a Class 4 class signature, such as implemented in the IEEE 802.3 standard. Therefore, in response to the values in the sequence of the classes provided by the PoE signal receiver 20 , the PoE controller 18 can identify that the PD 14 has a capacity for PoE control by the PSE device 12 .
  • the PD 14 can provide an indication of a nominal power level of the PD 14 to the PSE device 12 .
  • the nominal power level of the PD 14 corresponds to a maximum power consumption of the PD 14 at full and normal operating conditions (e.g., full light level for a PoE lighting system).
  • the third class signature that is less than the second class signature can have a class value (e.g., one of Class 0-4) corresponding to one of a plurality of predetermined nominal power levels, such that the PoE controller 18 can identify the nominal power level based on the value of the third class signature.
  • the PoE controller 18 can be configured to control the power level of the PD 14 as a function of the nominal power level, such that the power output of the PD 14 can be variably controlled by the PoE controller 18 .
  • the PoE controller 18 can provide a number of class events via the voltage signal V PORT associated with a code corresponding to the power setting command.
  • the power setting command can be encoded based on a quantity of pulses of the class events corresponding to a predetermined percentage of the nominal power level.
  • the PoE signal receiver 20 can identify the portion (e.g., percentage) of the nominal power level that is desired to be output from the PD 14 by the PoE controller 18 .
  • the PSE device 12 can provide the voltage signal V PORT in the activation phase at a maximum power on amplitude (e.g., between approximately 44 volts and approximately 57 volts, as dictated by a maximum voltage of an associated power supply). Therefore, the PD 14 can operate at the percentage of the nominal power level based on the power command setting. Accordingly, the PoE control system 10 described herein can operate to provide PHY layer power control of the PD 14 in a simplistic and variable manner.
  • FIG. 2 illustrates another example of a PoE control system 50 .
  • the PoE control system 50 can correspond to the PoE control system 10 in the example of FIG. 1 , such as in a PoE lighting application.
  • the PoE control system 50 can be implemented to provide power control via existing Ethernet cables (e.g., RJ-45 cables) without Ethernet data communication capability (e.g., utilizing data/link layers, packetization, etc.).
  • the PoE control system 50 includes a PSE device 52 and a PD 54 that are electrically coupled via an Ethernet connection 56 .
  • the Ethernet connection 56 is demonstrated as an RJ-45 cable that implements four twisted pair conductors. Therefore, the Ethernet connection 56 is demonstrated in the example of FIG. 2 as including two communication ports, demonstrated as PORT 1 and PORT 2 .
  • the PSE device 52 includes a voltage source 58 that is configured to generate a voltage signal V POE . In the example of FIG.
  • the PSE device 52 includes a PoE controller 60 that provides a voltage control signal P_CTL to the voltage source 58 to control the amplitude of the voltage signal V POE (e.g., depending on the operating phase), and to measure the class current of the voltage signal V POE .
  • the PoE controller 60 is also configured to generate a switching signal SW to control a set of switches S 1 and S 2 to provide the voltage signal V POE and a low-voltage (e.g., ground) connection, respectively, to the PD 54 via the Ethernet connection 56 as the voltage V PORT in the example of FIG. 1 .
  • the voltage signal V PORT is provided to the PD 54 based on the voltage V POE via each of PORT 1 and PORT 2 .
  • the PoE controller 60 can be configured to control an activation time and an amplitude of the voltage signal V PORT , such as based on a given operating phase of the PoE control system 50 , to provide communication to the PD 54 .
  • the voltage signal V POE can be provided via the voltage source 58 as the variable voltage V PORT .
  • the voltage signal V POE can be constant (e.g., between approximately 44 volts and approximately 57 volts), and the PSE device 52 can be configured to modulate the impedance of the switch S 1 to provide the variable voltage V PORT provided to the PD 54 .
  • the PD 54 includes a pair of rectifiers 62 that are each coupled to the Ethernet connection 56 at the respective ports PORT 1 and PORT 2 .
  • the rectifiers 62 are configured to provide the voltage signal V PORT across a capacitor C PD .
  • the PD 54 includes a PoE signal receiver 64 (“PoE RX”) that receives a voltage V P corresponding to the voltage signal V PORT across the capacitor C PD .
  • the PoE signal receiver 64 thus receives the voltage V P and acts as a current source with respect to the voltage V P , and thus the voltage signal V PORT , such that the PoE signal receiver 64 can adjust the class current of the voltage signal V PORT to provide communication to the PSE device 52 in response to the voltage signal V PORT
  • the PD 54 includes a power controller 66 to which the PoE signal receiver 64 can provide a control signal CTRL. Therefore, in response to a power setting command provided to the PoE signal receiver 64 by the PoE controller 60 , the PoE signal receiver 64 can indicate a desired output power level, such as being a function (e.g., percentage) of the nominal power level of the PD 54 , to the power controller 66 via the control signal CTRL. Accordingly, during the activation phase described in greater detail herein, the power controller 66 can provide the desired output power dictated by the power setting command in response to the full amplitude of the voltage signal V PORT provided by the PSE device 52 .
  • FIG. 3 illustrates an example of a timing diagram 100 .
  • the timing diagram 100 demonstrates an amplitude of the voltage signal V P as a function of time.
  • the timing diagram 100 can correspond to operation of the PoE control system 50 . Therefore, reference is to be made to the example of FIG. 2 in the following description of the example of FIG. 3 .
  • the voltage signal V P can have an amplitude V MIN , corresponding to a substantially minimum voltage (e.g., zero volts).
  • the amplitude V MIN could correspond to an actual voltage amplitude of the voltage signal V P , or could correspond to the switches S 1 and S 2 being open.
  • the PSE device 52 can begin operating in a detection phase, such that the voltage signal V P increases to a low amplitude V VALID1 (e.g., between approximately 2.8 volts and approximately 10 volts).
  • the PoE signal receiver 64 can respond by providing a sufficient resistance with respect to the voltage signal V P to indicate to the PSE device 52 that the PD 54 is coupled via the Ethernet connection 56 .
  • the voltage signal V P decreases to an amplitude V VALID2 (e.g., also between approximately 2.8 volts and approximately 10 volts, but different (e.g., less) than the amplitude V VALID1 ). Therefore, the PSE device 52 can determine the resistance value of the PoE signal receiver 64 based on a ⁇ I/ ⁇ V of the separate amplitudes V VALID1 and V VALID2 .
  • the amplitude V MIN thus concluding the detection phase. While the detection phase is demonstrated in the example of FIG. 3 as including only a single differential measurement of the voltage signal V P at the amplitudes V VALID1 and V VALID2 , it is to be understood that the detection phase could include differential measurements and/or additional amplitudes in the detection phase voltage amplitude range, such as dictated by the IEEE 802.3at standard.
  • the PSE device 52 switches to a classification phase, during which the PoE controller 60 can determine whether the PD 54 has a capacity for PoE control, can determine a nominal power level of the PD 54 , and can provide a power setting command to the PoE signal receiver 64 .
  • the PSE device 52 provides a first event classification, demonstrated at 102 as a 2-Event classification.
  • the voltage signal V P is provided at an amplitude V CLASS in a first class event.
  • the amplitude V CLASS can correspond to a voltage amplitude in a classification amplitude range amplitude (e.g., between approximately 15.5 volts and approximately 20.5 volts).
  • the PoE signal receiver 64 can indicate a first class value (e.g., Class 4).
  • the voltage signal V P can decrease to an amplitude V MRK , corresponding to a mark event.
  • the mark event can signify to the PoE signal receiver 64 the end of the first class event.
  • the PSE device 52 provides the voltage signal V P at the amplitude V CLASS in a second class event of the first event classification (e.g., of the 2 Event classification), in response to which the PoE signal receiver 64 can provide a second class value (e.g., Class 4), followed by another mark event at a time T 6 .
  • the first and second class values can be equal (e.g., Class 4).
  • the PD 14 can respond to the first event classification with a class signature that comprises two Class 4 current responses to the respective two class events of the first event classification 102 .
  • the first event classification 102 comprises two class events in a 2-Event classification scheme, such as to ensure a linear response to a substantially constant amplitude of the voltage signal V P at the classification amplitude range.
  • the PoE controller 60 can be configured to provide the first event classification as a 1-Event classification by providing a single class event, or based on providing more than two class events.
  • the PSE device 52 again provides the voltage signal V P at an amplitude V CLASS in a second event classification (e.g., a 1-Event classification), demonstrated at 104 .
  • a second event classification e.g., a 1-Event classification
  • the PoE signal receiver 64 can provide a second class signature (e.g., Class 5).
  • the voltage signal V P can decrease to the amplitude V MRK , corresponding to a mark event of the second event classification 104 , thus signifying to the PoE signal receiver 64 the end of the class event of the second event classification 104 .
  • the second class signature can be provided by the PoE signal receiver 64 at a value that is different from (e.g., greater than) the first class signature, thus potentially signifying to the PoE controller 60 that the PD 54 may have a capacity for PoE control.
  • the PSE device 52 again provides the voltage signal V P at an amplitude V CLASS in a third event classification, demonstrated at 106 .
  • the PoE signal receiver 64 can provide a third class signature at a value that is less than the second class signature (e.g., Class 0-4).
  • the voltage signal V P can decrease to the amplitude V MRK , corresponding to a mark event, thus signifying to the PoE signal receiver 64 the end of the third event classification 106 .
  • the third class signature can be provided by the PoE signal receiver 64 at a value that is less than the second class signature to indicate to the PoE controller 60 that the PD 54 has a capacity for PoE control.
  • the specific class value of the third class signature 106 can indicate to the PoE controller 60 the nominal power level of the PD 54 .
  • the class value of the third class signature can correspond to one of a plurality of predetermined nominal power levels, such that the PoE controller 60 can identify the nominal power level based on the value of the third class signature, such as provided in Table 1 below:
  • the PoE controller 60 can be configured to control the power level of the PD 54 as a function of the nominal power level, such that the power output of the PD 54 can be variably controlled by the PoE controller 60 .
  • the PoE controller 60 can begin to provide a number of event classifications (e.g., 1-Event classifications) via the voltage signal V P associated with a code corresponding to the power setting command.
  • the power setting command can be encoded based on a quantity of class events corresponding to a predetermined percentage of the nominal power level, such as provided in Table 2 below:
  • the predetermined percentage values of the nominal power level demonstrated in the example of Table 2 are provided only by example, in that the PoE controller 60 can be configured to provide any of a variety of predetermined quantities corresponding to associated percentages of nominal power level.
  • the example of FIG. 3 demonstrates a single class event with associated mark event subsequently at the time T 11 . However, it is to be understood that the PoE controller 60 can be configured to provide zero class events to signify a desired power level of the PD 54 .
  • the PoE signal receiver 64 can identify the percentage of the nominal power level that is desired to be output from the PD 54 by the PoE controller 60 .
  • the PSE device 52 begins operating in the activation phase, and thus provides the voltage signal V P at a maximum amplitude V PORT — PSE (e.g., between approximately 44 volts and approximately 57 volts, as dictated by a maximum voltage of an associated power supply). Therefore, the PD 54 can operate at the percentage of the nominal power level based on the power command setting. Accordingly, the PoE control system 50 described herein can operate to provide PHY layer power control of the PD 54 in a simplistic and variable manner.
  • FIG. 4 illustrates yet another example of a PoE control system 150 .
  • the PoE control system 150 can correspond to the PoE control system 10 in the example of FIG. 1 , such as in a PoE lighting application.
  • the PoE control system 150 can be implemented to provide power control via existing Ethernet cables (e.g., RJ-45 cables) without Ethernet data communication capability (e.g., utilizing data/link layers, packetization, etc.).
  • the PoE control system 150 includes a PSE device 152 and a PD 154 that are electrically coupled via an Ethernet connection 156 .
  • the Ethernet connection 156 is demonstrated as an RJ-45 cable that implements four twisted pair conductors. Therefore, the Ethernet connection 156 is demonstrated in the example of FIG. 4 as including two communication ports, demonstrated as PORT 1 and PORT 2 .
  • the PSE device 152 includes a voltage source 158 that is configured to generate a variable voltage signal V POE . Similar to as described previously in the example of FIG. 3 , the PSE device 152 can provide the voltage V POE in a variable manner as the voltage V PORT across the Ethernet connection 156 .
  • the PSE device 152 includes a PoE controller 160 that provides a voltage control signal P_CTL to the voltage source 158 to control the amplitude of the voltage signal V POE (e.g., depending on the operating phase), and to measure the class current of the voltage signal V PORT .
  • the PoE controller 160 is also configured to generate a pair of switching signals SW 1 and SW 2 to control a respective set of switches S 1 and S 2 to provide the voltage signal V POE and a low-voltage (e.g., ground) connection, respectively, to the PD 154 via the Ethernet connection 156 .
  • the PoE controller 160 can be configured to control an activation time and an amplitude of the voltage signal V PORT on each of PORTS 1 and 2 individually, such as based on a given operating phase of the PoE control system 150 , to provide communication to the PD 154 .
  • the PD 154 includes a first rectifier 162 that is coupled to the Ethernet connection 156 at PORT 1 and a second rectifier 163 that is coupled to the Ethernet connection 156 at PORT 2 .
  • the first rectifier 162 is configured to provide the voltage signal V PORT across a first capacitor C PD1 and the second rectifier 163 is configured to provide the voltage signal V PORT across a second capacitor C PD2 .
  • the second rectifier 163 is configured to provide the voltage signal V PORT across a second capacitor C PD2 .
  • the PD 154 includes a first PoE signal receiver 164 (“PoE RX 1 ”) that receives a voltage V P1 corresponding to the voltage signal V PORT across the first capacitor C PD1 and a second PoE signal receiver 165 (“PoE RX 2 ”) that receives a voltage V P2 corresponding to the voltage signal V PORT across the second capacitor C PD2 .
  • PoE RX 1 a first PoE signal receiver 164
  • PoE RX 2 receives a voltage V P2 corresponding to the voltage signal V PORT across the second capacitor C PD2 .
  • the first PoE signal receiver 164 thus receives the voltage VPD 1 and acts as a current source with respect to the voltage VPD 1 , and thus the voltage signal V PORT , such that the first PoE signal receiver 164 can adjust the class current of the voltage signal V PORT to provide communication to the PSE device 152 in response to the voltage signal V PORT
  • the second PoE signal receiver 165 thus receives the voltage VPD 2 and acts as a current source with respect to the voltage VPD 2 , and thus the voltage signal V PORT , such that the second PoE signal receiver 164 can adjust the class current of the voltage signal V PORT to provide communication to the PSE device 152 in response to the voltage signal V PORT
  • the PD 154 includes a power controller 166 to which the first and second PoE signal receivers 164 and 165 can provide respective control signals CTRL 1 and CTRL 2 .
  • the PoE signal receiver(s) 164 and 165 can indicate a desired output power level, such as being a function (e.g., percentage) of the nominal power level of the PD 154 , to the power controller 166 via the control signal(s) CTRL 1 and CTRL 2 . Accordingly, during the activation phase described in greater detail herein, the power controller 166 can provide the desired output power dictated by the power setting command in response to the full amplitude of the voltage signal V PORT provided by the PSE device 152 .
  • FIG. 5 illustrates an example of timing diagrams 200 and 201 .
  • the timing diagram 200 demonstrates an amplitude of the voltage V P1 as a function of time
  • the timing diagram 201 demonstrates an amplitude of the voltage V P2 as a function of time.
  • the timing diagrams 200 and 201 can correspond to operation of the PoE control system 150 . Therefore, reference is to be made to the example of FIG. 4 in the following description of the example of FIG. 5 .
  • the voltage V P1 corresponds to the voltage V PORT in response to activation of the switch S 1 via the switching signal SW 1
  • voltage V P2 corresponds to the voltage V PORT in response to activation of the switch S 2 via the switching signal SW 2 .
  • the voltages V P1 and V P2 can each have an amplitude V MIN , corresponding to a substantially minimum voltage (e.g., zero volts).
  • the amplitude V MIN could correspond to an actual voltage amplitude of the voltages V P1 and V P2 , or could correspond to the switches S 1 and S 2 being open.
  • the PSE device 152 can begin operating in a detection phase, such that the voltage V P1 increases to the amplitude V VALID1 .
  • the first PoE signal receiver 164 can respond by providing a sufficient resistance with respect to the voltage V P1 to indicate to the PSE device 152 that the PD 154 is coupled via the Ethernet connection 156 .
  • the voltage V P1 decreases to an amplitude V VALID1
  • the voltage V P2 increases to the amplitude V VALID1
  • the voltage V P1 decreases back to the amplitude V MIN .
  • the voltage V P2 decreases to the amplitude V VALID2 .
  • the second PoE signal receiver 165 can respond by providing a sufficient resistance with respect to the voltage V P2 to indicate to the PSE device 152 that the PD 154 is coupled via the Ethernet connection 156 . Therefore, the PSE device 152 can determine the resistance value of the PoE signal receivers 164 and 165 based on a ⁇ I/ ⁇ V of the separate amplitudes V VALID1 and V VALID2 .
  • the voltage V P2 decreases back to the amplitude V MIN , thus concluding the detection phase, based on which the PoE controller 160 identifies that both PORT 1 and PORT 2 are coupled to the respective first and second PoE signal receivers 164 and 165 .
  • the detection phase is demonstrated in the example of FIG. 5 as including only a single pulse of the voltages V P1 and V P2 at the single amplitude V VALID , it is to be understood that the detection phase could include additional pulses and/or additional amplitudes in the detection phase voltage amplitude range, such as dictated by the IEEE 802.3at standard, for each of the voltages V P1 and V P2 .
  • the PSE device 152 switches to a classification phase, during which the PoE controller 160 can determine whether the PD 154 has a capacity for PoE control, can determine a nominal power level of the PD 154 , and can provide a power setting command to the PoE signal receiver(s) 164 and 165 .
  • the PSE device 152 provides a first event classification to the first PoE signal receiver 164 , demonstrated at 102 as a 2-Event classification.
  • the voltage V P1 increases to an amplitude V CLASS in a first class event.
  • the amplitude V CLASS can correspond to a voltage amplitude in a classification amplitude range amplitude (e.g., between approximately 15.5 volts and approximately 20.5 volts).
  • the PoE signal receiver 164 can provide a first class value (e.g., Class 4).
  • the voltage V P1 can decrease to an amplitude V MRK , corresponding to a mark event.
  • the mark event can signify to the first PoE signal receiver 164 the end of the first class event of the event classification 202 .
  • the voltage V P1 increases to the amplitude V CLASS in a second class event of the event classification 202 , in response to which the PoE signal receiver 64 can provide a second class value (e.g., Class 4), followed by another mark event at a time T 7 .
  • the first and second initial class values can be equal (e.g., Class 4).
  • the first PoE receiver 164 can respond to the first event classification with a class signature that comprises two Class 4 current responses to the respective two class events of the first event classification 202 .
  • the first event classification 202 comprises two class events in a 2-Event classification scheme, such as to ensure a linear response to a substantially constant amplitude of the voltage signal V PORT at the classification amplitude range.
  • the PSE device 152 can be configured to provide the first event classification as a 1-Event classification by providing a single class event, or based on providing more than two class events.
  • the PSE device 152 provides a second event classification via PORT 2 , demonstrated at 204 , at which the voltage V P2 increases to an amplitude V CLASS in a class event at the time T 8 .
  • the second PoE signal receiver 165 can provide a second class signature (e.g., Class 5).
  • the voltage V P2 can decrease to the amplitude V MRK , corresponding to a mark event, thus signifying to the second PoE signal receiver 165 the end of the class event of the event classification 204 .
  • the second class signature can be provided by the second PoE signal receiver 165 at a value that is different from the first class signature, thus potentially signifying to the PoE controller 160 that the PD 154 may have a capacity for PoE control.
  • the PSE device 152 provides a third event classification via PORT 2 , demonstrated at 206 , at which the voltage V P2 increases to the amplitude V CLASS in a class event at the time T 10 .
  • the second PoE signal receiver 166 can provide a third class signature that is less than the second class signature (e.g., Class 0-4).
  • the voltage V P2 can decrease to the amplitude V MRK , corresponding to a mark event, thus signifying to the second PoE signal receiver 165 the end of the class event of the third event classification 206 .
  • the third class signature can be provided by the second PoE signal receiver 166 at a value that is less than the second class signature to indicate to the PoE controller 160 that the PD 154 has a capacity for PoE control.
  • the specific class value of the third class signature 206 can indicate to the PoE controller 160 the nominal power level of the PD 154 , such as demonstrated previously in Table 1.
  • the PoE controller 160 can be configured to control the power level of the PD 154 as a function of the nominal power level, such that the power output of the PD 154 can be variably controlled by the PoE controller 160 .
  • the PoE controller 160 can begin to provide a number of class events via one or both of the voltages V P1 and V P2 associated with a code corresponding to the power setting command.
  • the power setting command can be encoded based on a quantity of pulses of the class events corresponding to a predetermined percentage of the nominal power level, such as provided previously in Table 2.
  • the additional class events that indicate the percentage of nominal power level can be provided solely via the voltage V P1 , solely via the voltage V P2 , or based on a combination of the voltages V P1 and V P2 .
  • the code can be based on a sum of the quantity of class events provided via the voltages V P1 and V P2 , or the code can be based on a binary and/or time-based encoding of the class events provided via the voltages V P1 and V P2 .
  • the additional class events that indicate the percentage of nominal power level can be provided in any of a variety of ways.
  • the first and/or second PoE signal receivers 164 and 165 can identify the percentage of the nominal power level that is desired to be output from the PD 154 by the PoE controller 160 .
  • the PSE device 152 begins operating in the activation phase, and thus provides the voltage signal V PORT at a maximum amplitude to provide the voltages V P1 and/or V P2 at the amplitude V PORT — PSE . Therefore, the PD 154 can operate at the percentage of the nominal power level based on the power command setting. Accordingly, the PoE control system 150 described herein can operate to provide PHY layer power control of the PD 154 in a simplistic and variable manner over multiple ports via the Ethernet connection 156 .
  • FIG. 6 a method in accordance with various aspects of the present invention will be better appreciated with reference to FIG. 6 . While, for purposes of simplicity of explanation, the method of FIG. 6 is shown and described as executing serially, it is to be understood and appreciated that the present invention is not limited by the illustrated order, as some aspects could, in accordance with the present invention, occur in different orders and/or concurrently with other aspects from that shown and described herein. Moreover, not all illustrated features may be required to implement a method in accordance with an aspect of the present invention.
  • FIG. 6 illustrates an example of a method 250 for providing power control in a PoE control system.
  • event classifications e.g., event classifications 102 , 104 , and 106
  • a voltage signal e.g., the voltage signal V PORT
  • an Ethernet connection e.g., the Ethernet connection 16
  • a PSE device e.g., the PSE device 12
  • a nominal power level is indicated based on a class signature (e.g., the class signature 106 ) via a PoE signal receiver (e.g., the PoE signal receiver 20 ) of a powered device (e.g., the PD 14 ) based on a class current of the voltage signal.
  • a PoE signal receiver e.g., the PoE signal receiver 20
  • a power setting command associated with a quantity of class events of the voltage signal (e.g., at the time T 11 in the example of FIG. 3 ) is provided from the PSE device to the PoE signal receiver.
  • the power setting command can correspond to a percentage of the nominal power level (e.g., Table 1).
  • the PD is activated to operate at the percentage of the nominal power level based on the power setting command.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Power Sources (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
US14/448,753 2013-08-09 2014-07-31 POWER-OVER-ETHERNET (PoE) CONTROL SYSTEM Abandoned US20150042243A1 (en)

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US14/448,753 US20150042243A1 (en) 2013-08-09 2014-07-31 POWER-OVER-ETHERNET (PoE) CONTROL SYSTEM
CN201480042866.7A CN105453484A (zh) 2013-08-09 2014-08-11 以太网供电控制系统
JP2016533495A JP6445558B2 (ja) 2013-08-09 2014-08-11 パワーオーバーイーサネット制御システム
PCT/US2014/050568 WO2015021475A1 (en) 2013-08-09 2014-08-11 Power-over-ethernet control system
EP14834395.7A EP3031171B1 (en) 2013-08-09 2014-08-11 Power-over-ethernet control system
CN201910280039.6A CN110071817B (zh) 2013-08-09 2014-08-11 以太网供电控制系统
US15/865,441 US11012247B2 (en) 2013-08-09 2018-01-09 Power-over-ethernet (PoE) control system having PSE control over a power level of the PD
JP2018223558A JP6916429B2 (ja) 2013-08-09 2018-11-29 パワーオーバーイーサネット制御システム
US17/227,166 US11855790B2 (en) 2013-08-09 2021-04-09 Power-over-ethernet (PoE) control system

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US201361864179P 2013-08-09 2013-08-09
US14/448,753 US20150042243A1 (en) 2013-08-09 2014-07-31 POWER-OVER-ETHERNET (PoE) CONTROL SYSTEM

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JP6916429B2 (ja) 2021-08-11
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US20180131530A1 (en) 2018-05-10
JP6445558B2 (ja) 2018-12-26

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