CN113777426A - Hierarchical detection method for power over Ethernet system and power supply equipment - Google Patents
Hierarchical detection method for power over Ethernet system and power supply equipment Download PDFInfo
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Abstract
The application discloses a hierarchical detection method for an Ethernet power supply system, which comprises the following steps: implementing different classification strategies according to protocol rules of the power supply equipment and whether the powered equipment supports automatic classification, wherein the classification strategies comprise applying classification voltage and marking voltage for multiple times; acquiring a plurality of classification currents of the powered device under a plurality of classification voltages under different classification strategies; a classification attribute of the powered device is obtained from a plurality of classification currents of the powered device. The application also provides a power supply unit, makes the powered device that has automatic hierarchical characteristic can correctly, high-efficiently accomplish hierarchical detection, avoids causing hierarchical detection to make mistakes because the automatic hierarchical characteristic of powered device for power supply unit can't normally supply power to legal powered device.
Description
Technical Field
The present invention relates to power over ethernet technology, and more particularly, to a power over ethernet system classification detection method and a power supply device.
Background
The Power Over Ethernet (POE) technology is a technology for providing dc Power to a terminal device in a network through a network cable based on the existing Ethernet wiring infrastructure. In the power over ethernet technology, the network cable has both functions of transmitting data signals and supplying power with dc. The technology ensures that the terminal equipment does not need to depend on an external power adapter for power supply, thereby saving a power adapter, a power supply cable and a plug and saving wiring and hardware cost.
The ethernet Power Sourcing Equipment is divided into Power Sourcing Equipment (PSE) and Powered Device (PD). PSE and PD are established based on Institute of Electrical and Electronics Engineers (IEEE) standards. The POE power supply process is divided into four stages of Detection (Detection), Classification (including Mark), power supply (including Inrush) and power failure.
According to the ieee802.3af/at standard, in the detection phase of the PSE, when a device connected to the PSE is detected as a valid PD device, the PSE device classifies the PD device through a classification (classification) mechanism to obtain classification level information of the PD device. After the PD device is powered on (power up), the PSE device may provide maximum power to the PD device according to the classification level information of the PD device.
In order to make PSE equipment more effective to provide sufficient power to PD equipment, a new standard developed by POE, the 802.3bt standard, introduces a new classification mechanism: automatic classification (Autoclass). When the PSE device provides a classification voltage Vclass to the PD device, the classification current is automatically reduced after a certain time of the first classification voltage, and automatic classification is exited when the port voltage of the powered port is reduced from the classification voltage to the mark voltage VMark range.
However, when the signature impedance value is too large, the time required for the classification voltage to drop to the mark voltage Vmark is too long, and the mark time is over, the actual PD device port voltage does not drop to the mark voltage, which causes a classification error report, exits the classification process, and cannot be normally powered on.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a classification detection method and a power supply apparatus for a power over ethernet system, which can accurately and efficiently complete classification.
According to an aspect of the present invention, there is provided a hierarchical detection method for a power over ethernet system, including: implementing different classification strategies according to protocol rules of the power supply equipment and whether the powered equipment supports automatic classification, wherein the classification strategies comprise applying classification voltage and marking voltage for multiple times; acquiring a plurality of classification currents of the powered device under a plurality of classification voltages under different classification strategies; a classification attribute of the powered device is obtained from a plurality of classification currents of the powered device.
Preferably, the performing different classification strategies according to whether the power supplying apparatus and the power receiving apparatus support automatic classification includes: judging whether the protocol rule of the power supply equipment supports automatic classification; applying a first classification voltage to a powered device when the power sourcing equipment supports automatic classification; judging whether the powered device supports automatic classification or not within the maintaining time of the first classification voltage; when the powered device supports automatic classification, applying a classification voltage and a marking voltage to the powered device for multiple times, wherein each applied classification voltage and marking voltage has a corresponding maintenance time; acquiring a plurality of classification currents of a powered device under a plurality of classification voltages; obtaining a classification attribute of the powered device according to a plurality of classification currents of the powered device; wherein, when the power supply apparatus and the powered apparatus both support automatic classification, the maintaining time of the marker voltage is adjusted according to the signature impedance value of the powered apparatus so that the voltage of the powered apparatus falls from the classification voltage to the marker voltage within the maintaining time of the marker voltage.
Preferably, when the powered device supports automatic classification, applying the classification voltage and the marking voltage to the powered device a plurality of times includes: applying a first mark voltage to the powered device, and prolonging the maintaining time of the first mark voltage according to the signature impedance value of the powered device so that the powered device is reduced from a first grading voltage to the first mark voltage in the maintaining time of the first mark voltage; the method includes applying the second classification voltage and the second marker voltage to the powered device one or more times, and extending a duration of the second marker voltage applied each time according to a signature impedance value of the powered device such that the powered device drops from the second classification voltage to the second marker voltage within the duration of the second marker voltage.
Preferably, the applying the classification voltage and the marker voltage to the power receiving apparatus a plurality of times further includes, according to a protocol rule of the power supply apparatus: applying a third marker voltage to a powered device when the powered device does not support automatic classification; the second classification voltage and the third marker voltage are applied to the powered device one or more times.
Preferably, the applying the classification voltage and the marker voltage to the power receiving apparatus a plurality of times further includes, according to a protocol rule of the power supply apparatus: applying a third classification voltage and a third marker voltage to a powered device when the protocol rules of the power sourcing equipment do not support the automatic classification feature; the second classification voltage and the third marker voltage are applied to the power receiving apparatus a plurality of times.
Preferably, the first classification voltage, the third classification voltage and the second classification voltage have the same amplitude and different maintaining time.
Preferably, the first, second and third mark voltages have the same amplitude and different maintaining time, the maintaining time of the first mark voltage is longer than that of the third mark voltage, and the maintaining time of the second mark voltage is longer than that of the third mark voltage.
Preferably, the hierarchical detection method further comprises: obtaining a signature impedance value of a powered device, wherein the signature impedance value comprises a signature resistance value and/or a signature capacitance value.
Preferably, the obtaining of the signature impedance value of the powered device comprises: providing a detection signal to a powered device, the detection signal comprising a voltage signal and/or a current signal; acquiring a measurement signal flowing through a powered device; and acquiring a signature impedance value of the powered device according to the detection signal and the measurement signal.
According to another aspect of the present invention, there is provided a power supply apparatus including: a power supply circuit for supplying power to a powered device through a power supply port; a controller for implementing different classification strategies including applying classification voltages and marking voltages a plurality of times according to a protocol rule of a power supplying apparatus and whether a powered apparatus supports automatic classification; the controller is further configured to obtain a plurality of classification currents of the powered device at a plurality of classification voltages; the controller is further configured to obtain a classification attribute of the powered device based on a plurality of classification currents of the powered device.
Preferably, the controller is further configured to determine whether the protocol rule of the power supply device supports automatic classification; the controller is further configured to control the power supply circuit to apply a first classification voltage to the powered device when the power supply device supports automatic classification; the controller is further configured to determine whether the powered device supports automatic classification within a retention time of the first classification voltage;
the controller is further configured to control the power supply circuit to apply a classification voltage and a marker voltage to the powered device a plurality of times when the powered device supports automatic classification, wherein each application of the classification voltage and the marker voltage has a corresponding hold time; (ii) a
Wherein the controller is further configured to adjust a sustain time of the marker voltage according to a signature impedance value of the powered device such that a voltage of the powered device falls from the classification voltage to the marker voltage within the sustain time of the marker voltage when both the power supplying device and the powered device support automatic classification.
Preferably, the controller includes: the control unit is used for judging whether the protocol rule of the power supply equipment supports automatic classification; the control unit is further configured to control the power supply circuit to apply a first classification voltage to a powered device when the power supply device supports automatic classification; the control unit is further configured to determine whether the powered device supports automatic classification within a retention time of the first classification voltage; the control unit is further used for controlling the power supply circuit to apply the classification voltage and the marking voltage to the powered device for multiple times when the powered device supports automatic classification, wherein each applied classification voltage and marking voltage has a corresponding maintaining time; a measurement unit configured to acquire a plurality of classification currents of the powered device at a plurality of classification voltages; the control unit is further configured to obtain a classification attribute of the powered device according to a plurality of classification currents of the powered device; wherein the controller is further configured to adjust a holding time of the marker voltage according to a signature impedance value of the powered device such that a voltage of the powered device falls from the classification voltage to the marker voltage within the holding time of the marker voltage when both the power supply device and the powered device support automatic classification.
Preferably, the control unit is further configured to control the power supply circuit to apply a first flag voltage to the powered device and extend a holding time of the first flag voltage according to a signature impedance value of the powered device so that the powered device falls from the first classification voltage to the first flag voltage within the holding time of the first flag voltage when the powered device supports automatic classification; the control unit is further configured to control the power supply circuit to apply the second classification voltage and the second marker voltage to the powered device one or more times, and to extend a holding time of the second marker voltage applied each time according to a signature impedance value of the powered device so that the powered device drops from the second classification voltage to the second marker voltage within the holding time of the second marker voltage.
Preferably, the control unit is further configured to control the power supply circuit to apply a third flag voltage to the powered device when the powered device does not support automatic classification; and applying the second classification voltage and the third marker voltage to the powered device one or more times.
Preferably, the control unit is further configured to control the power supply circuit to apply the third classification voltage and the third marker voltage to the power receiving apparatus and to apply the second classification voltage and the third marker voltage to the power receiving apparatus one or more times when the protocol rule of the power supply apparatus does not support automatic classification.
Preferably, the first classification voltage, the third classification voltage and the second classification voltage have the same amplitude and different maintaining time.
Preferably, the first, second and third mark voltages have the same amplitude and different maintaining time, the maintaining time of the first mark voltage is longer than that of the third mark voltage, and the maintaining time of the second mark voltage is longer than that of the third mark voltage.
Preferably, the control unit is further configured to obtain a signature impedance value of the powered device, where the signature impedance value includes a signature resistance value and a signature capacitance value.
Preferably, the control unit is further configured to control the power supply circuit to provide a detection signal to a powered device, where the detection signal includes a voltage signal and/or a current signal; the measurement unit is used for acquiring a measurement signal flowing through a powered device; the control unit is further configured to obtain a signature impedance value of the powered device according to the detection signal and the measurement signal.
According to the classification detection method and the power supply equipment for the Ethernet power supply system, different classification strategies are implemented according to the protocol rule of the power supply equipment and whether the power receiving equipment supports automatic classification, so that the power receiving equipment with the automatic classification characteristic can accurately and efficiently complete classification detection, and the power supply equipment cannot normally supply power to legal power receiving equipment due to classification detection errors caused by the automatic classification characteristic of the power receiving equipment is avoided.
Further, when the protocol rule of the power supply apparatus supports automatic classification and the powered apparatus supports automatic classification, the holding time of the tag voltage is adjusted according to the signature impedance value of the powered apparatus so that the powered apparatus drops from the classification voltage to the tag voltage within the holding time of the tag voltage, thereby the power supply apparatus is not affected by automatic classification in the classification stage and classification can be completed correctly and efficiently.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 shows a schematic circuit diagram of a POE power supply system in the prior art;
fig. 2 is a schematic waveform diagram illustrating a power supply device in a POE power supply system supporting automatic classification in the prior art, and when the automatic classification is used;
fig. 3 shows a flowchart of a classification detection method of a POE power supply system according to an embodiment of the present invention;
fig. 4 shows a flowchart of step S110 in the classification detection method of the POE power supply system according to the embodiment of the present invention;
fig. 5 shows a waveform diagram when the POE power supply system supports automatic classification and uses automatic classification according to an embodiment of the present invention;
fig. 6 shows a waveform diagram when the POE powering system supports automatic classification but does not use automatic classification according to an embodiment of the present invention;
fig. 7 is a schematic diagram of waveforms when the POE powering system does not support automatic classification according to an embodiment of the present invention;
fig. 8 shows a schematic configuration diagram of a power supply apparatus according to an embodiment of the present invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.
Fig. 1 shows a schematic circuit diagram of a POE power supply system 100 in the prior art. As shown in fig. 1, the POE power supply system 100 includes a power supply apparatus 10, a powered apparatus 20, and an interface unit 30 connected between the power supply apparatus 10 and the powered apparatus 20.
Specifically, the power supply apparatus 10 may be a switch, a hub, a router, or the like, and the powered apparatus 20 may be a wireless access point, a camera, an IP phone, or the like. The power supply apparatus 10 includes a power supply circuit 11, a controller 12, and a power supply port 13.
The power receiving apparatus 20 includes a power receiving port 21, a power receiving control circuit 22, and a load 23. The power receiving port 21 has a bridge structure.
The interface unit 30 includes a plurality of transformers (T1-T2) connected to the power supply ports 13, each power supply port being connected to a pair of transformers, and a plurality of transformers (T3-T4) connected to the power receiving ports, each power receiving port being connected to a pair of transformers, and a plurality of pairs of power supply lines (P1-P2, P3-P4); the power supply port 13 is connected to a first transformer T1 and a second transformer T2 respectively; the power receiving port 21 is connected to a third transformer T3 and a fourth transformer T4, respectively.
A first input terminal of the power receiving port 21 is connected to a center tap of a primary winding of the transformer connected to the first power supply line pair (P1-P2), and a second input terminal of the power receiving port 21 is connected to a center tap of a primary winding of the transformer connected to the second power supply line pair (P3-P4). I.e., the first and second inputs of the power receiving port 21 are connected to the center tap of the primary winding of the third transformer T3 and the center tap of the primary winding of the fourth transformer T4, respectively.
The positive output of the power receiving port 21 is connected to the positive input of the power receiving control circuit 22, and the negative output of the power receiving port 21 is connected to the negative input of the power receiving control circuit 22. Powered control circuit 22 has a path from the positive input terminal to its positive output terminal and has a path from the negative input terminal to its negative output terminal. A positive input terminal of the load 23 is connected to a positive output terminal of the power reception control circuit 23.
In the related art, when the power supply apparatus 10 and the power receiving apparatus 20 both support automatic classification and classify the power receiving apparatus 20 by automatic classification, the controller 12 controls the power supply circuit 11 to apply a plurality of classification voltages Vclass and a marker voltage Vmark to the power receiving apparatus 20, the classification voltage Vclass having a magnitude of 15.5V to 20.5V, the marker voltage Vmark having a magnitude of 7V to 10V, and a retention time T of the marker voltage VmarkMEIs 6ms to 12 ms.
The power supply circuit 11 provides the classification voltage Vclass for the first time, and the retention time T of the classification voltage Vclass provided for the first timeLCEFrom 88ms to 105ms, the current Ipd at the powered device 20 is automatically reduced from the classification current Iclass to the automatic classification current threshold Iautoclass after the automatic classification time threshold Tacs due to the classification voltage Vclass supplied for the first time. The voltage Vpd of the powered device 20 obtained by the measurement module 13 is maintained for the time T of the first time mark voltage VmarkME0The inner slave stage voltage Vclass starts to drop. When the signature impedance value of the power receiving apparatus 20 is excessively large, the holding time T at the first-time flag voltage VmarkME0The voltage Vpd at the powered device 20 cannot drop to the mark voltage Vmark, and the current Ipd at the powered device 20 is maintainedThe automatic classification current threshold value Iautoclass is maintained, so that a classification error is caused, and the classification flow is interrupted.
Fig. 3 shows a flowchart of a classification detection method of a POE power supply system according to an embodiment of the present invention. Referring to fig. 3, the hierarchical detection method includes the following steps.
In step S110, different classification strategies are implemented depending on the protocol rules of the power sourcing equipment and whether the powered device supports automatic classification, the classification strategies including applying a classification voltage and a marking voltage multiple times, each time with a corresponding sustain time.
In this embodiment, the protocol rule of the power supply device 10 includes a protocol followed by the power supply device 10 and a classification type of the power supply device 10, where the protocol is an IEEE802.3af standard, an IEEE802.3at standard, and an IEEE802.3bt standard, and the maximum range of the classification type is class0-class 8; the hierarchical type includes at least one of class0-class 8. For example, the power supply device 10 conforms to the ieee802.3at standard, and can realize classification of class0-class 3. The protocol rules specify the classification voltage Vclass and the marker voltage Vmark magnitude and the holding time per application.
Specifically, step S110 includes steps S111 to S114.
In step S111, it is determined whether the protocol rule of the power supply apparatus supports the automatic classification feature.
Specifically, it is determined whether the protocol rule of the power supply apparatus 10 is the IEEE802.3af/at standard that does not support the automatic classification feature or the IEEE802.3bt standard that supports the automatic classification feature.
In step S112, when the protocol rule of the power supply apparatus supports the automatic classification feature, a first classification voltage is applied to the powered apparatus.
Specifically, when the protocol rule of the power supply apparatus 10 is the ieee802.3bt standard supporting the automatic classification feature, the first classification voltage Vclass1 is applied to the powered apparatus 20, the amplitude of the first classification voltage Vclass1 is 15.5V to 20.5V, and the retention time T of the first classification voltage Vclass1 is TLCEIs 88ms to 105 ms.
In step S113, it is determined whether the powered device supports automatic classification during the holding time of the first classification voltage.
In step S114, when the powered device supports automatic classification, a first flag voltage is applied to the powered device, and a sustain time of the first flag voltage is extended according to a signature impedance value of the powered device, and then step S115 is performed.
Specifically, referring to fig. 5, when the powered device 20 also supports automatic classification, the first marker voltage Vmark1 is applied to the powered device, and the maintenance time T of the first marker voltage Vmark1 is set according to the signature impedance value of the powered device 20ME0Extending T0 such that the power receiving apparatus 20 maintains the first marker voltage Vmark1 for a time TME0From the first classification voltage Vclass1 down to the first marker voltage Vmark 1. Holding time T of first marker voltage Vmark1ME0Longer than the holding time of the mark voltage Vmark specified by the protocol.
In step S115, the second classification voltage and the second marker voltage are applied to the powered device one or more times, wherein a holding time of the second marker voltage is extended according to the signature impedance value of the powered device.
Specifically, referring to fig. 5, the second classification voltage Vclass2 and the second marker voltage Vmark2 continue to be applied to the power receiving apparatus a plurality of times; and the holding time of the second marker voltage Vmark2 is adjusted to t1 according to the signature impedance value of the power receiving apparatus. Holding time T of second classification voltage Vclass2CEV6ms to 20ms, and a holding time T of the second marker voltage Vmark2ME1Are all adjusted to T1 such that the power receiving apparatus 20 maintains the second marker voltage Vmark2 for a subsequent plurality of applicationsME1From the second classification voltage Vclass2 down to a second label voltage Vmark 2. Holding time T of second marker voltage Vmark2ME1Longer than the holding time of the mark voltage Vmark specified by the protocol.
In step S116, when the powered device does not support automatic classification, a third flag voltage is applied to the powered device, and then step S118 is performed.
Specifically, referring to fig. 6, when the powered device does not support automatic classification, the power is applied to the powered deviceA third marker voltage Vmark3 is applied. The amplitude of the third marker voltage Vmark3 is 7V to 10V, and the maintenance time T of the third marker voltage Vmark3ME0Is 6ms to 12 ms.
In step S117, when the protocol rule of the power supply apparatus does not support the automatic classification standard, the third classification voltage and the third flag voltage are applied to the power receiving apparatus, and then step S118 is performed.
Specifically, referring to fig. 7, when the protocol rule of the power supplying apparatus 10 is IEEE802.3af/at standard that does not support the automatic classification feature, a third classification voltage Vclass3 is applied to the powered apparatus 20, the amplitude of the third classification voltage Vclass3 is 15.5V to 20.5V, and the duration T of the third classification voltage Vclass3 is T time TLCE6ms to 75 ms. The amplitude of the third marker voltage Vmark3 is 7V to 10V, and the maintenance time T of the third marker voltage Vmark3ME0Is 6ms to 12 ms.
In step S118, the second classification voltage and the third marker voltage are applied to the power receiving apparatus one or more times.
Specifically, the amplitude of the second classification voltage Vclass2 is 15.5V-20.5V, and the maintaining time T of the second classification voltage Vclass2CEV6 ms-20 ms; the amplitude of the third marker voltage Vmark3 is 7V to 10V, and the maintenance time T of the third marker voltage Vmark3ME2Is 6ms to 12 ms.
The first classification voltage Vclass1, the second classification voltage Vclass2 and the third classification voltage Vclass3 have the same amplitude and different maintaining time.
The amplitudes of the first mark voltage Vmark1, the second mark voltage Vmark2 and the third mark voltage Vmark3 are the same, and the holding times are different, the holding time of the first mark voltage Vmark1 is longer than the holding time of the third mark voltage Vmark3, and the holding time of the second mark voltage Vmark2 is longer than the holding time of the third mark voltage Vmark 3.
In step S120, under different classification strategies, a plurality of classification currents of the powered device at a plurality of classification voltages are acquired.
In the present embodiment, the power supply apparatus 10 acquires a plurality of classification currents at a plurality of classification voltages of the powered apparatus 20 through the controller 12.
In step S130, a classification attribute of the power receiving apparatus is acquired from a plurality of classification currents of the power receiving apparatus.
In the present embodiment, when a plurality of classification currents obtained by the power receiving apparatus 20 at a plurality of classification voltages are each within a range of one classification attribute, the power receiving apparatus 20 belongs to the corresponding classification.
For example, when current Ipd of powered device 20 at a plurality of classification voltages is measured to be within the current range of class1, the classification attribute of the powered device is determined to be class 1. The relationship between classification current Iclass and classification attributes of the powered device is shown in the following table:
| Iclass/IPD | Classification |
| 1mA～4mA | Class0 |
| 9mA～12mA | Class1 |
| 17mA～20mA | Class2 |
| 26mA～30mA | Class3 |
| 36mA～44mA | Class4 |
in a preferred embodiment, the hierarchical detection method further includes step S100.
In step S100, a signature impedance value of the powered device is acquired, wherein the signature impedance value includes a signature resistance value and a signature capacitance value.
Specifically, a detection signal including a voltage signal and/or a current signal is provided to the power receiving apparatus 20; acquiring a measurement signal flowing through the powered device 20; a signature impedance value of the powered device 20 is obtained from the measurement signal and the detection signal, and the signature impedance value includes a signature resistance value and/or a signature capacitance value.
According to the classification detection method provided by the embodiment of the invention, different classification strategies are implemented according to the protocol rule of the power supply equipment and whether the power receiving equipment supports automatic classification, so that the power receiving equipment with the automatic classification characteristic can accurately and efficiently complete classification detection, and the power supply equipment cannot normally supply power to legal power receiving equipment due to classification detection errors caused by the automatic classification characteristic of the power receiving equipment is avoided.
Further, when the protocol rule of the power supply apparatus supports automatic classification and the powered apparatus supports automatic classification, the holding time of the tag voltage is adjusted according to the signature impedance value of the powered apparatus so that the powered apparatus drops from the classification voltage to the tag voltage within the holding time of the tag voltage, thereby the power supply apparatus is not affected by automatic classification in the classification stage and classification can be completed correctly and efficiently.
Fig. 8 shows a schematic structural diagram of a power supply apparatus according to an embodiment of the present invention. Referring to fig. 8, the power supply apparatus includes a power supply circuit 11, a controller 12, and a power supply port 13.
The power supply circuit 11 is configured to supply power to the powered device 20 through the power supply port 13.
In the present embodiment, the power supply circuit 11 includes a first power supply 11a and a second power supply 11 b. The first power supply 11a is for supplying a voltage signal and a classification voltage and a marking voltage to the power supply port 13, and the second power supply 11b is for supplying a current signal to the power supply port 13.
The controller 12 is configured to implement different classification strategies including applying the classification voltage and the marking voltage multiple times, depending on protocol rules of the power sourcing equipment and whether the powered device supports automatic classification.
In this embodiment, the controller 12 is configured to determine whether the protocol rules of the power supply apparatus 10 support automatic classification. The controller 12 is further configured to control the power supply circuit 11 to apply the first classification voltage to the powered device 20 when the power supply device supports automatic classification. The controller 12 is further configured to control the power supply circuit 11 to apply the classification voltage and the tag voltage to the powered device 20 multiple times when the powered device 20 supports automatic classification, each time the classification voltage and the tag voltage are applied with a corresponding hold time. The controller 12 is further configured to adjust the holding time of the tag voltage according to a signature impedance value of the powered device such that the powered device decreases from the classification voltage to the tag voltage within the holding time of the tag voltage when the protocol rule of the power sourcing equipment supports the automatic classification feature and the powered device supports automatic classification.
In the present embodiment, the controller 12 includes a control unit 12a and a measurement unit 12 b.
Wherein the control unit 12a is configured to determine whether the protocol rules of the power supply apparatus support the automatic classification feature.
Specifically, it is determined whether the protocol rule of the power supply apparatus 10 is the IEEE802.3af/at standard that does not support the automatic classification feature or the IEEE802.3bt standard that supports the automatic classification feature.
The control unit 12a is configured to apply a first classification voltage to the powered device when the protocol rules of the power sourcing equipment support the automatic classification feature.
Specifically, when the protocol rule of the power supply apparatus 10 is the ieee802.3bt standard supporting the automatic classification feature, the first classification voltage Vclass1 is applied to the powered apparatus 20, the amplitude of the first classification voltage Vclass1 is 15.5V to 20.5V, and the retention time T of the first classification voltage Vclass1 is TLCEIs 88ms to 105 ms.
The control unit 12a is configured to determine whether the powered device supports automatic classification within the holding time of the first classification voltage.
The control unit 12a is further configured to control the power supply circuit to apply a first flag voltage to the powered device and extend a holding time of the first flag voltage according to a signature impedance value of the powered device so that the powered device drops from the first classification voltage to the first flag voltage within the holding time of the first flag voltage when the powered device supports automatic classification.
Specifically, referring to fig. 5, when the powered device 20 also supports automatic classification, the first marker voltage Vmark1 is applied to the powered device, and the maintenance time T of the first marker voltage Vmark1 is set according to the signature impedance value of the powered device 20ME0Extending T0 such that the power receiving apparatus 20 maintains the first marker voltage Vmark1 for a time TME0From the first classification voltage Vclass1 down to the first marker voltage Vmark 1. Holding time T of first marker voltage Vmark1ME0Longer than the holding time of the mark voltage Vmark specified by the protocol.
The control unit 12a is further configured to control the power supply circuit to apply the second classification voltage and the second marker voltage to the powered device a plurality of times, and to extend a holding time of the second marker voltage applied each time according to a signature impedance value of the powered device so that the powered device drops from the second classification voltage to the second marker voltage within the holding time of the second marker voltage.
Specifically, referring to fig. 5, the second classification voltage Vclass2 and the second marker voltage Vmark2 continue to be applied to the power receiving apparatus a plurality of times; and the holding time of the second marker voltage Vmark2 is adjusted to t1 according to the signature impedance value of the power receiving apparatus. Holding time T of second classification voltage Vclass2CEV6ms to 20ms, and a holding time T of the second marker voltage Vmark2ME1Are all adjusted to T1 such that the power receiving apparatus 20 maintains the second marker voltage Vmark2 for a subsequent plurality of applicationsME1From the second classification voltage Vclass2 down to a second label voltage Vmark 2. Holding time T of second marker voltage Vmark2ME1Longer than the holding time of the mark voltage Vmark specified by the protocol.
The control unit 12a is configured to control the power supply circuit to apply a third flag voltage to the powered device when the powered device does not support automatic classification; and applying the second classification voltage and the third marker voltage to the powered device one or more times.
Specifically, referring to fig. 6, when the powered device does not support automatic classification, the third marker voltage Vmark3 is applied to the powered device. The amplitude of the third marker voltage Vmark3 is 7V to 10V, and the maintenance time T of the third marker voltage Vmark3ME0Is 6ms to 12 ms.
The control unit 12a is configured to control the power supply circuit to apply the third classification voltage and the third marker voltage to the power receiving apparatus and to apply the second classification voltage and the third marker voltage to the power receiving apparatus one or more times, when the protocol rule of the power supply apparatus does not support automatic classification.
Specifically, referring to fig. 7, when the protocol rule of the power supplying apparatus 10 is IEEE802.3af/at standard that does not support the automatic classification feature, a third classification voltage Vclass3 is applied to the powered apparatus 20, the amplitude of the third classification voltage Vclass3 is 15.5V to 20.5V, and the duration T of the third classification voltage Vclass3 is T time TLCE6ms to 75 ms. The amplitude of the third marker voltage Vmark3 is 7V to 10V, and the maintenance time T of the third marker voltage Vmark3ME0Is 6ms to 12 ms. The amplitude of the second classification voltage Vclass2 is 15.5V-20.5V, and the maintaining time T of the second classification voltage Vclass2CEV6 ms-20 ms; the amplitude of the third marker voltage Vmark3 is 7V to 10V, and the maintenance time T of the third marker voltage Vmark3ME2Is 6ms to 12 ms.
The first classification voltage Vclass1, the second classification voltage Vclass2 and the third classification voltage Vclass3 have the same amplitude and different maintaining time.
The amplitudes of the first mark voltage Vmark1, the second mark voltage Vmark2 and the third mark voltage Vmark3 are the same, and the holding times are different, the holding time of the first mark voltage Vmark1 is longer than the holding time of the third mark voltage Vmark3, and the holding time of the second mark voltage Vmark2 is longer than the holding time of the third mark voltage Vmark 3.
The measurement unit 12b is configured to obtain a plurality of classification currents of the powered device at a plurality of classification voltages.
In the present embodiment, the power supply apparatus 10 acquires a plurality of classification currents at a plurality of classification voltages of the powered apparatus 20 through the measurement unit 12 b.
The control unit 12a is further configured to obtain a classification attribute of the powered device according to a plurality of classification currents of the powered device under different classification strategies.
In the present embodiment, when a plurality of classification currents obtained by the power receiving apparatus 20 at a plurality of classification voltages are each within a range of one classification attribute, the power receiving apparatus 20 belongs to the corresponding classification.
The control unit 12a is further configured to obtain a signature impedance value of the powered device, where the signature impedance value includes a signature resistance value and a signature capacitance value.
The control unit 12a controls the power supply circuit 11 to provide a detection signal including a voltage signal and/or a current signal to the power receiving apparatus 20. The measurement unit 12b is configured to obtain a measurement signal flowing through the powered device. The control unit 12a acquires a signature impedance value of the powered device from the detection signal and the measurement signal.
According to the power supply equipment provided by the embodiment of the invention, different classification strategies are implemented according to the protocol rule of the power supply equipment and whether the power receiving equipment supports automatic classification, so that the power receiving equipment with the automatic classification characteristic can accurately and efficiently complete classification detection, and the power supply equipment can not normally supply power to legal power receiving equipment due to classification detection errors caused by the automatic classification characteristic of the power receiving equipment.
Further, when the protocol rule of the power supply apparatus supports automatic classification and the powered apparatus supports automatic classification, the holding time of the tag voltage is adjusted according to the signature impedance value of the powered apparatus so that the powered apparatus drops from the classification voltage to the tag voltage within the holding time of the tag voltage, thereby the power supply apparatus is not affected by automatic classification in the classification stage and classification can be completed correctly and efficiently.
While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (19)
1. A hierarchical detection method for a power over ethernet system, comprising:
implementing different classification strategies according to protocol rules of the power supply equipment and whether the powered equipment supports automatic classification, wherein the classification strategies comprise applying classification voltage and marking voltage for multiple times;
acquiring a plurality of classification currents of the powered device under a plurality of classification voltages under different classification strategies;
a classification attribute of the powered device is obtained from a plurality of classification currents of the powered device.
2. The classification detection method according to claim 1, wherein performing different classification strategies depending on whether the power supply apparatus and the power receiving apparatus support automatic classification comprises:
judging whether the protocol rule of the power supply equipment supports automatic classification;
applying a first classification voltage to a powered device when the power sourcing equipment supports automatic classification;
judging whether the powered device supports automatic classification or not within the maintaining time of the first classification voltage;
when the powered device supports automatic classification, applying a classification voltage and a marking voltage to the powered device for multiple times, wherein each applied classification voltage and marking voltage has a corresponding maintenance time;
and adjusting the maintaining time of the mark voltage according to the signature impedance value of the powered device so that the voltage of the powered device is reduced from the grading voltage to the mark voltage within the maintaining time of the mark voltage.
3. The classification detection method according to claim 2, wherein applying the classification voltage and the marker voltage to the powered device a plurality of times when the powered device supports automatic classification includes:
applying a first mark voltage to the powered device, and prolonging the maintaining time of the first mark voltage according to the signature impedance value of the powered device so that the powered device is reduced from a first grading voltage to the first mark voltage in the maintaining time of the first mark voltage;
the method includes applying the second classification voltage and the second marker voltage to the powered device one or more times, and extending a duration of the second marker voltage applied each time according to a signature impedance value of the powered device such that the powered device drops from the second classification voltage to the second marker voltage within the duration of the second marker voltage.
4. The classification detection method according to claim 2, wherein performing different classification strategies depending on whether the power supply apparatus and the power receiving apparatus support automatic classification further comprises:
applying a third marker voltage to a powered device when the powered device does not support automatic classification;
the second classification voltage and the third marker voltage are applied to the powered device one or more times.
5. The hierarchical detection method according to claim 2, further comprising:
applying a third classification voltage and a third marker voltage to a powered device when the protocol rules of the power sourcing equipment do not support automatic classification;
the second classification voltage and the third marker voltage are applied to the powered device one or more times.
6. The classification detection method according to claim 5, wherein the first classification voltage, the second classification voltage, and the third classification voltage have the same amplitude and different holding times.
7. The gradation detecting method according to claim 5, wherein the first mark voltage, the second mark voltage, and the third mark voltage have the same amplitude and different holding times, the holding time of the first mark voltage is longer than the holding time of the third mark voltage, and the holding time of the second mark voltage is longer than the holding time of the third mark voltage.
8. The hierarchical detection method according to claim 1, further comprising: obtaining a signature impedance value of a powered device, wherein the signature impedance value comprises a signature resistance value and/or a signature capacitance value.
9. The hierarchical detection method according to claim 8, wherein obtaining a signature impedance value of a powered device comprises:
providing a detection signal to a powered device, the detection signal comprising a voltage signal and/or a current signal;
acquiring a measurement signal flowing through a powered device;
and acquiring a signature impedance value of the powered device according to the detection signal and the measurement signal.
10. A power supply apparatus, comprising:
a power supply circuit for supplying power to a powered device through a power supply port;
a controller for implementing different classification strategies including applying classification voltages and marking voltages a plurality of times according to a protocol rule of a power supplying apparatus and whether a powered apparatus supports automatic classification;
the controller is further configured to obtain a plurality of classification currents of the powered device at a plurality of classification voltages;
the controller is further configured to obtain a classification attribute of the powered device based on a plurality of classification currents of the powered device.
11. The power supply apparatus of claim 10, wherein the controller is further configured to determine whether the protocol rules of the power supply apparatus support automatic classification;
the controller is further configured to control the power supply circuit to apply a first classification voltage to the powered device when the power supply device supports automatic classification;
the controller is further configured to determine whether the powered device supports automatic classification within a retention time of the first classification voltage;
the controller is further configured to control the power supply circuit to apply a classification voltage and a marker voltage to the powered device a plurality of times when the powered device supports automatic classification, wherein each application of the classification voltage and the marker voltage has a corresponding hold time;
wherein the controller is further configured to adjust a sustain time of the marker voltage according to a signature impedance value of the powered device such that a voltage of the powered device falls from the classification voltage to the marker voltage within the sustain time of the marker voltage when both the power supplying device and the powered device support automatic classification.
12. The power supply apparatus according to claim 11, wherein the controller comprises:
the control unit is used for judging whether the protocol rule of the power supply equipment supports automatic classification;
the control unit is further configured to control the power supply circuit to apply a first classification voltage to a powered device when the power supply device supports automatic classification;
the control unit is further configured to determine whether the powered device supports automatic classification within a retention time of the first classification voltage;
the control unit is further configured to apply a classification voltage and a marker voltage to the powered device a plurality of times when the powered device supports automatic classification, wherein each applied classification voltage and marker voltage has a corresponding hold time;
a measurement unit configured to acquire a plurality of classification currents of the powered device at a plurality of classification voltages;
the control unit is further configured to obtain a classification attribute of the powered device according to a plurality of classification currents of the powered device;
wherein the control unit is further configured to adjust a sustain time of the marker voltage according to a signature impedance value of the powered device such that a voltage of the powered device falls from the classification voltage to the marker voltage within the sustain time of the marker voltage when both the power supply device and the powered device support automatic classification.
13. The power supply apparatus according to claim 12, wherein the control unit is further configured to control the power supply circuit to apply a first flag voltage to the power receiving apparatus and extend a holding time of the first flag voltage according to a signature impedance value of the power receiving apparatus such that the power receiving apparatus falls from the first classification voltage to the first flag voltage within the holding time of the first flag voltage, when the power receiving apparatus supports automatic classification;
the control unit is further configured to control the power supply circuit to apply the second classification voltage and the second marker voltage to the powered device one or more times, and to extend a holding time of the second marker voltage applied each time according to a signature impedance value of the powered device so that the powered device drops from the second classification voltage to the second marker voltage within the holding time of the second marker voltage.
14. The power supply apparatus according to claim 12, wherein the control unit is further configured to control the power supply circuit to apply a third flag voltage to a powered apparatus when the powered apparatus does not support automatic classification; and applying the second classification voltage and the third marker voltage to the powered device one or more times.
15. The power supply apparatus according to claim 12, wherein the control unit is further configured to control the power supply circuit to apply the third classification voltage and the third marker voltage to the power receiving apparatus and to apply the second classification voltage and the third marker voltage to the power receiving apparatus one or more times when the protocol rule of the power supply apparatus does not support automatic classification.
16. The power supply device of claim 15 wherein the first, second and third classification voltages are of the same magnitude and different hold times.
17. The power supply device according to claim 15, wherein the first, second, and third flag voltages have the same amplitude and different holding times, and wherein the holding time of the first flag voltage is longer than the holding time of the third flag voltage, and the holding time of the second flag voltage is longer than the holding time of the third flag voltage.
18. The power sourcing equipment of claim 12, wherein the control unit is further configured to obtain a signature impedance value for a powered device, wherein the signature impedance value comprises a signature resistance value and a signature capacitance value.
19. The power supply apparatus according to claim 18, wherein the control unit is further configured to control the power supply circuit to provide a detection signal to a powered apparatus, wherein the detection signal comprises a voltage signal and/or a current signal;
the measurement unit is used for acquiring a measurement signal flowing through a powered device;
the control unit is further configured to obtain a signature impedance value of the powered device according to the detection signal and the measurement signal.
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