CN117135001A - Method, system and readable storage medium for controlling power maintaining feature - Google Patents

Method, system and readable storage medium for controlling power maintaining feature Download PDF

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Publication number
CN117135001A
CN117135001A CN202311393700.7A CN202311393700A CN117135001A CN 117135001 A CN117135001 A CN 117135001A CN 202311393700 A CN202311393700 A CN 202311393700A CN 117135001 A CN117135001 A CN 117135001A
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count value
mpdo
mps
power
current
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CN117135001B (en
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张万鹏
傅金
欧雪春
东伟
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Meraki Integrated Shenzhen Technology Co ltd
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Meraki Integrated Shenzhen Technology Co ltd
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The application relates to a method, a system and a readable storage medium for controlling a power maintaining characteristic. The power-holding characteristic control method comprises the steps of obtaining sampling current at a preset frequency in the process of supplying power to power receiving equipment, and comparing the sampling current with the preset holding current to obtain a comparison result; updating at least the MPDO count value according to a preset rule based on the comparison result, wherein the updating comprises but is not limited to: when the sampling current is larger than the holding current, the MPDO count value is not increased, and the MPDO count value is continuously updated according to the preset rule; when the sampling current is smaller than or equal to the holding current, the MPDO count value counts forward, and whether the MPDO count value is larger than or equal to a first threshold value is judged: if not, continuing updating according to the preset rule, and if so, powering down. And the technical problem that the existing PSE power-characteristic-maintaining control scheme cannot be compatible with non-standard PD is solved.

Description

Method, system and readable storage medium for controlling power maintaining feature
Technical Field
The application relates to the technical field of power over ethernet, in particular to a method and a system for controlling a power maintaining characteristic and a readable storage medium.
Background
Power over ethernet (Power over Ethernet, poE) is a revolutionary technology that delivers data and power to remote devices over standard wire-line cables. The PoE integrates data and power on the same network cable, ensures the safety of the existing CAT-5 Ethernet infrastructure and structural layout, and simultaneously allows IP telephones, wireless LAN Access Points (AP), remote monitoring, security network cameras, intelligent sound boxes and other IP-based terminals to receive the power parallel to the data. The PoE system consists of a power sourcing equipment (Power Sourcing Equipment, PSE), a wire link, and a Powered Device (PD). The PSE transmits power to the PD by applying a voltage to the network cable. To ensure that all devices conforming to the IEEE power over ethernet standard are capable of cooperating, the Institute of Electrical and Electronics Engineers (IEEE) promulgates the IEEE802.3 af, IEEE802.3at, and IEEE802.3bt standards, and the market for PoE devices has rapidly expanded as standards are established and perfected.
Typically PoE systems need to go through 5 phases: detection, classification, surge, normal power and power down stages. The PSE identifies the characteristic resistance of the PD in the detection stage and judges whether the PD is in compliance or not; classification is the process by which PSE and PD mutually identify the power class that needs to operate; the surge phase is a phase in which PSE and PD mutually identify and start to power up after confirming the power class, and current limiting protection measures are usually provided; the PSE transmits power to the PD in a normal power supply stage, and meanwhile, the working state of the PD is monitored by identifying current information; once the PD is over-current, the port is shorted, and the PD is disconnected, the PSE may actively shut off power. When the PSE supplies power to the PD, the PSE must monitor the current consumed by the port to monitor whether the PD is in a connected state; the minimum current that the PD must draw to avoid disconnection is referred to as the hold power signature (Maintain Power Signature, MPS); when MPS current defaults to at least 400ms, the PSE needs to disconnect power to ensure that the cable is not in the energized state.
The IEEE standard specifies that if the port current continues to be greater than 10mA for 60ms, the PSE cannot power down; if the port current is less than 5mA and lasts 400ms, the PSE must power down, where the PSE may power down at 300ms at the earliest, but must power down at 400ms. The IEEE standard specifies that the PD must consume at least 10mA of current within 75ms, after which the low current time cannot exceed 250ms to ensure that it continues to receive power from the PSE. However, the MPS function of PSE hides many undefined behaviors, most notably: (1) Whenever the port current is between 5 milliamp and 10 milliamp, the PSE may or may not remove power, and the default timing also has a fuzzy range; (2) During the period when the PD maintains the power signature off (Maintain Power Signature dropout time, MPDO), the PSE may choose not to remove power as long as the port current is greater than 10mA for any infinitesimal period of time. However, there are still many PDs on the market with MPS times approaching 75ms and even far below the standard, and with the influence of long-distance network wires, the MPS current actually observed by the PSE will be shorter in duration, resulting in many MPS protocol compatibility problems.
There are two main strategies for solving the above problems: one is to set the MPS time of the PSE device very small because it considers that switching off a device that should be powered on is worse than not switching off a device that should not be powered on; the other is to set the MPS time higher, so that the noise immunity of the system can be improved. Increasing MPS time results in an adapted PD having to follow the protocol specifications strictly, however many PDs due to their dynamic nature of load, resulting in MPS time of the PD well below 60ms, resulting in many PDs on the market being refused out of the gate unless the light load power consumption is sacrificed, with the additional configuration of a dummy load consuming more power.
Disclosure of Invention
The application mainly solves the technical problem that the existing PSE power characteristic control scheme cannot be compatible with non-standard PD.
To solve the above technical problem, an embodiment of the present application provides a method for controlling a power maintaining feature, including:
in the process of supplying power to the power receiving equipment, acquiring sampling current at a preset frequency, and comparing the sampling current with a preset holding current to obtain a comparison result;
updating at least the MPDO count value according to a preset rule based on the comparison result, wherein the updating comprises but is not limited to:
when the sampling current is larger than the holding current, the MPDO count value is not increased, and the MPDO count value is continuously updated according to the preset rule;
when the sampling current is smaller than or equal to the holding current, the MPDO count value counts forward, and whether the MPDO count value is larger than or equal to a first threshold value is judged: if not, continuing updating according to the preset rule, and if so, powering down.
The embodiment of the application also provides a control system for maintaining the power characteristics, which comprises power receiving equipment, a network cable link and power supply equipment;
the number of the powered devices is at least one, and the powered devices are connected with the power supply device through the network cable link and acquire electric energy;
the network cable link is used for connecting the power receiving equipment and the power supply equipment;
the power supply apparatus is configured to supply power to the power receiving apparatus through the network cable link, and execute the power maintenance feature control method as described above.
Embodiments of the present application also provide a computer-readable storage medium storing one or more computer programs executable by one or more processors to implement the method of preserving power characteristics control as described above.
According to the method, the system and the readable storage medium for controlling the power maintaining characteristic of the embodiment, at least one MPDO bidirectional counter is selected at the power supply equipment end, a reasonable forward and reverse counting step length is set, when the MPS power maintaining characteristic exists, the MPS is counted reversely, otherwise, the MPS is counted positively, the MPS protection is triggered after the counter reaches a set target value, the MPS time accumulating function of any sliding time window is finally realized, and more nonstandard PDs with too short MPS time are compatible on the basis of conforming to IEEE standard standards.
Drawings
FIG. 1 is a flowchart (I) of a method for maintaining power feature control according to an embodiment of the present application;
FIG. 2 is a flowchart of a method for controlling a power-conserving feature according to an embodiment of the present application;
FIG. 3 is a flowchart of a method for controlling a power-conserving feature according to an embodiment of the present application;
FIG. 4 is a flowchart of a method for controlling a power-conserving feature according to an embodiment of the present application;
FIG. 5 is a schematic diagram (I) of a method for maintaining power characteristics according to an embodiment of the present application;
FIG. 6 is a schematic diagram (II) of a method for maintaining power characteristics according to an embodiment of the present application;
fig. 7 is a schematic diagram (iii) of a method for controlling a power-maintaining characteristic according to an embodiment of the present application.
Detailed Description
The application will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, related operations of the present application have not been shown or described in the specification in order to avoid obscuring the core portions of the present application, and may be unnecessary to persons skilled in the art from a detailed description of the related operations, which may be presented in the description and general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated.
In the application, poE is Power over Ethernet, namely the power over Ethernet technology, which is the power supply technology for transmitting data and power to remote equipment through a standard network cable, namely integrating the data and the power on the same network cable; in general, poE systems include a power sourcing equipment, a network cable link, and a powered device. PSE, powerSourcing Equipment, i.e. power supply device. PD is Powered Devices, i.e., powered Devices.
In the present application MPS, maintain Power Signature, i.e. the maintenance of the power characteristic, refers to the minimum current that the PD has to draw to avoid disconnection. When the MPS current defaults for at least a certain time, the PSE is required to cut off the power supply, so that the cable is ensured not to be in an electrified state; in the IEEE standard specification, the certain time is specified as 400ms.
In the application, MPDO, maintain Power Signature dropout, i.e. keeping the power feature off, is a concept opposite to MPS, meaning that the current drawn by PD is not or less than a certain value; in the IEEE standard specification, the constant value is specified as 10mA.
In the embodiment of the application, the following steps are included:
Δt, i.e. the sampling period, also referred to as the sampling clock period;
I MPS i.e. the holding current, also referred to as the defined current threshold;
I PORT i.e. the sampling current, also referred to as the comparison port current of the comparator;
T MPS i.e. to maintain the power signature time;
T MPDO i.e. maintaining the power signature off time;
T HSY i.e. the filtering time between adjacent pulses.
Embodiment one:
referring to fig. 1, in order to solve the technical problem that the existing PSE power-maintaining characteristic control scheme cannot be compatible with non-standard PDs whose MPS time is far lower than the standard, the embodiment provides a power-maintaining characteristic control method, which includes the following steps:
step S101, acquiring sampling current at a preset frequency in the process of supplying power to the power receiving equipment, and comparing the sampling current with a preset holding current to obtain a comparison result.
In this embodiment, an MPDO counter and a comparator are used to periodically obtain a sampling current at a preset frequency, and compare the magnitude relation between the sampling current and a holding current, where the time interval between two adjacent samplings at the preset frequency is a sampling period, the holding current is a current threshold defined by a maintenance power characteristic, and the sampling current is a comparison port current of the comparator; the comparator outputs two comparison results by comparing the magnitude of the sampling current and the magnitude of the holding current, namely, different comparison results are fed back and output according to two comparison conditions of the sampling current being greater than the holding current and the sampling current being less than or equal to the holding current.
And step S102, updating at least the MPDO count value according to a preset rule based on the comparison result.
In this embodiment, the values of one MPDO counter appearing in succession in one counting process are the pre-accumulation MPDO count value and the post-accumulation MPDO count value, respectively. The updated preset rules include: when comparing, if the sampling current is smaller than or equal to the holding current, the accumulated MPDO count value is counted forward to obtain an accumulated MPDO count value; if the sampling current is larger than the holding current, the MPDO count value is not increased, namely the MPDO count value is kept unchanged, and a certain fixed value or negative counting is given; the accumulated MPDO count value is an accumulated MPDO count value obtained by the previous comparison, and the accumulated MPDO count value of the first comparison is 0.
The MPDO count value is associated with the accumulated time for which the power feature is kept off, and indicates the accumulated time for which the power feature is kept off; for different comparison results output by the MPDO counter, accumulating or processing the MPDO count before accumulating to obtain an accumulated MPDO count, wherein the accumulated meaning includes but is not limited to increasing or decreasing; the process of obtaining the accumulated mpd count value by the accumulated mpd count value further includes processing the accumulated mpd count value according to a certain comparison result output by the comparator, including but not limited to resetting, clearing, assigning, etc., and obtaining the accumulated mpd count value after the accumulated mpd count value is processed.
Preferably, the up-count step is a fixed value.
Preferably, the pre-accumulation MPDO count value is in a proportional relationship with the accumulated time for maintaining the power feature off for a certain interval. The lower limit value of the certain interval is zero, and the upper limit value is the ratio of the power characteristic maintaining off time to the sampling period; in the certain interval, every time the accumulated time of keeping the power characteristic off increases the sampling period, the MPDO count value counts positively, otherwise, the MPDO count value does not increase, i.e. the MPDO count value remains unchanged and a certain fixed value or negative count is given. The sampling period is the time interval between two samplings when sampling at a preset frequency.
Step S103, when the accumulated MPDO count value is greater than or equal to a first threshold, the powered device powers down.
In this embodiment, the powered device powers down, that is, triggers MPS protection, that is, the power sourcing equipment PSE takes a power-down operation, and takes a power-down operation for the current powered device PD. And if the accumulated MPDO count value is smaller than the first threshold value, performing next comparison after the sampling period is spaced.
In this embodiment, when the sampling current is greater than the holding current, the MPDO count value is not increased, and is continuously updated according to the preset rule; when the sampling current is smaller than or equal to the holding current, the MPDO count value counts forward, and whether the MPDO count value is larger than or equal to a first threshold value is judged: if not, continuing updating according to the preset rule, and if so, powering down.
Embodiment two:
referring to fig. 2, in order to solve the technical problem that the existing PSE power-maintaining feature control scheme cannot be compatible with non-standard PDs whose MPS time is far lower than the standard, the embodiment provides a power-maintaining feature control method, which includes the following steps:
step S201, during power supply to the powered device, a sampling current is obtained at a preset frequency, and the sampling current is compared with a preset holding current, so as to obtain a comparison result.
In this embodiment, an MPDO bidirectional counter and a comparator are used to periodically obtain a sampling current at a preset frequency, and compare the magnitude relation between the sampling current and a holding current, wherein the time interval of two adjacent samplings at the preset frequency is a sampling period, the holding current is a current threshold defined by a maintenance power characteristic, and the sampling current is a comparison port current of the comparator; the comparator outputs two comparison results by comparing the magnitude of the sampling current and the magnitude of the holding current, namely, different comparison results are fed back and output according to two comparison conditions of the sampling current being greater than the holding current and the sampling current being less than or equal to the holding current.
In step S202, the MPDO counter value is used to represent the value of the MPDO up-down counter, and the initial value is 0.
In this embodiment, the values of one mpd bidirectional counter appearing in sequence in one counting process are respectively a pre-accumulation mpd count value and a post-accumulation mpd count value, and the mpd bidirectional counter has a bidirectional counting function, that is, the pre-accumulation mpd count value of the mpd bidirectional counter is increased by one value in the forward direction or decreased by one value in the reverse direction to obtain the post-accumulation mpd count value, and the obtained post-accumulation mpd count value is used as the pre-accumulation mpd count value of the next increase or decrease of the mpd bidirectional counter.
Step 203, if the sampling current is less than or equal to the holding current, the MPDO count value counts forward. I.e. the accumulated MPDO count value is obtained after the accumulated MPDO count value is counted forward.
Step S204, if the sampling current is greater than the holding current, the MPDO count is counted in reverse. Namely, the accumulated MPDO count value is obtained after the accumulated MPDO count value is counted reversely.
In this embodiment, the pre-accumulation MPDO count value is the post-accumulation MPDO count value obtained by the previous comparison, and the pre-accumulation MPDO count value of the first comparison is 0.
Preferably, the absolute values of the positive counting step and the negative counting step are different, that is, each time the MPDO up-down counter is increased and each time the MPDO down-down counter is decreased, the obtained accumulated MPDO count value is not equal to the accumulated MPDO count value of the previous comparison after the MPDO up-down counter is increased and decreased once.
Still preferably, the forward counting step length is a fixed value, the backward counting step length is a coefficient related to the proportion of the holding power characteristic time to the holding power characteristic off time, and when the set holding power characteristic time or the holding power characteristic off time is changed, the backward counting step length is also changed; the purpose is to ensure the flexibility of the control method. In the present preferred embodiment, the absolute values of the positive-direction count step and the negative-direction count step are equal.
Step S205, when the MPDO count value is greater than or equal to the first threshold, the powered device powers down. And when the powered device is powered down, the MPS protection is triggered.
And S206, when the MPDO count value is smaller than or equal to a second threshold value, resetting the MPDO count value, and continuing updating according to the preset rule.
In this embodiment, when the sampling current is greater than the holding current, the MPDO count value counts reversely; judging whether the MPDO count value is smaller than or equal to a second threshold value: if not, continuing to update according to the preset rule, if so, resetting the MPDO count value, and then continuing to update according to the preset rule; when the sampling current is smaller than or equal to the holding current, the MPDO count value counts forward, and whether the MPDO count value is larger than or equal to a first threshold value is judged: if not, continuing updating according to the preset rule, and if so, powering down.
In this embodiment, MPS protection is triggered, that is, the power sourcing equipment PSE takes a power down operation, and the current powered device PD takes a power down operation. And if the MPDO count value is smaller than the first threshold value and the MPDO count value is smaller than or equal to the second threshold value, the accumulated MPDO count value is restored to 0, and the next comparison is carried out after the sampling period is spaced. And when the accumulated MPDO count value is smaller than the first threshold value and larger than the second threshold value, performing next comparison after the sampling period is spaced.
In this embodiment, the first threshold is TMPDO/Δt, and the second threshold is 0; wherein TMPS is the holding power characteristic time, TMPDO is the holding power characteristic off time, and DeltaT is the sampling period sampled at a preset frequency.
Preferably, the back count step is (TMPS+TMPDO)/TMPS.
Preferably, the up-counting step is 1.
Referring to FIG. 5, an embodiment is provided for defining a specification-compliant MPS parameter T in a PSE device MPDO 、I MPS And T MPS Determining a time window length as t=t MPS +T MPDO The port current is noted as I PORT . In this embodiment, the port current I is compared by the comparator PORT And defined I MPS . Collecting logical output result of comparator, if I PORT Greater than I MPS The comparator output is 1, and vice versa is 0. Comparator output functionThere are two comparison results, namely the following formula:
；
based on the obtained comparison result, selecting an MPDO up-down counter and a comparator, wherein the triggering and sampling clock periods of the MPDO up-down counter and the comparator are delta T; providing a cumulative pre-MPDO count value C SUM The preset initial value is 0. Known requirements are that at any time window T MPS +T MPDO MPS must be present for a time exceeding T MPS Power supply can be continued, so the up-count step is set to 1, and the down-count step is set to (T MPS +T MPDO )/T MPS 。
When (when)When the MPDO up-down counter is in step (T MPS +T MPDO )/T MPS Reverse count, namely:
C SUM =C SUM -(T MPS +T MPDO )/T MPS ；
when (when)When the MPDO up-down counter counts up with a unit step size of 1, namely:
C SUM =C SUM +1；
wherein, in the equation of the accumulated step length, C on the left side of the equal sign SUM To accumulate the MPDO count value, C to the right of the equal sign SUM To accumulate a pre-MPDO count value.
The first threshold is reached: c (C) SUM ≥T MPDO In a certain comparison, when the accumulated MPDO count value of the MPDO up-down counter reaches T MPDO At/. DELTA.T, MPS protection is triggered.
Reaching the second threshold is: c (C) SUM In a comparison, when the accumulated MPDO count value of the MPDO bidirectional counter is a negative value, the MPDO count value is restored to a preset initial value of 0, and the next comparison is carried out after sampling periods are spaced; when the MPDO up-down counter is 0, the MPDO up-down counter can only count forward and keep backward.
When the MPDO up-down counter is smaller than the first threshold value and larger than the second threshold value, the next comparison is carried out after the sampling period is separated.
Embodiment III:
referring to fig. 3, in order to solve the technical problem that the existing PSE power-maintaining characteristic control scheme cannot be compatible with non-standard PDs whose MPS time is far lower than the standard, the embodiment provides a power-maintaining characteristic control method, which includes the following steps:
step S301, in the process of supplying power to the powered device, a sampling current is obtained at a preset frequency, and the sampling current is compared with a preset holding current, so as to obtain a comparison result.
In this embodiment, an MPDO counter, an MPS counter, and a comparator are used to periodically obtain a sampling current at a preset frequency, and compare the magnitude relation between the sampling current and a holding current, where a time interval between two adjacent samples at the preset frequency is a sampling period, the holding current is a current threshold defined by a maintenance power characteristic, and the sampling current is a comparison port current of the comparator; the comparator outputs two comparison results by comparing the magnitude of the sampling current and the magnitude of the holding current, namely, different comparison results are fed back and output according to two comparison conditions of the sampling current being greater than the holding current and the sampling current being less than or equal to the holding current.
In step S302, the MPDO count value and the MPS count value are used to represent the values of the MPDO counter and the MPS counter, respectively, and the initial value is 0.
In this embodiment, the values of one MPDO counter that occur sequentially in the primary counting process are respectively a pre-accumulation MPDO count value and a post-accumulation MPDO count value, and the values of one MPS counter that occur sequentially in the primary counting process are respectively a pre-accumulation MPS count value and a post-accumulation MPS count value.
Step S303, if the sampling current is less than or equal to the holding current, the MPDO count value counts forward, and the MPS count value remains unchanged.
Step S304, if the sampling current is larger than the holding current, the MPDO count value is kept unchanged, and the MPS count value is counted forward.
In this embodiment, during a certain counting process: the accumulated MPDO count value is an accumulated MPDO count value obtained by the previous comparison, and the accumulated MPDO count value of the first comparison is 0; the pre-accumulation MPS count value is the post-accumulation MPS count value obtained by the previous comparison, and the pre-accumulation MPS count value of the first comparison is 0.
Step S305, when the MPDO count value is greater than or equal to the first threshold, the powered device powers down. And when the powered device is powered down, the MPS protection is triggered.
And step S306, when the MPS count value is greater than or equal to the third threshold value, the MPDO count value and the MPS count value are both recovered to 0, and the next comparison is performed after the interval sampling period. And when the accumulated MPDO count value is smaller than the first threshold value and the accumulated MPS count value is smaller than the third threshold value, performing next comparison after the interval sampling period.
In this embodiment, when the sampling current is less than or equal to the holding current, the MPS count value is maintained unchanged and the MPDO count value is counted forward, and whether the MPDO count value is greater than or equal to the first threshold value is determined: if not, continuing updating according to the preset rule, and if so, powering down. When the sampling current is larger than the holding current, the MPSO count value is kept unchanged and the MPS count value is counted forward; judging whether the MPS count value is greater than or equal to a third threshold value: if yes, resetting the MPDO count value and the MPS count value, and then continuing updating according to the preset rule; if not, continuing to judge whether the MPDO count value is greater than or equal to a first threshold: if not, continuing updating according to the preset rule, and if so, powering down.
In this embodiment, the first threshold is T MPDO a/DeltaT, the third threshold value is T MPS /DeltaT; wherein T is MPS To maintain the power characteristic time, T MPDO To maintain the power characteristic off-time, Δt is the sampling period sampled at a preset frequency; triggering MPS protection, namely taking power-down operation by power supply equipment PSE, and taking power-down operation by current powered equipment PD.
Preferably, the up-count step is 1.
Referring to FIG. 6, an embodiment is provided for defining a specification-compliant MPS parameter T in a PSE device MPDO 、I MPS And T MPS Determining a time window length as t=t MPS +T MPDO The port current is noted as I PORT . In this embodiment, the port current I is compared by the comparator PORT And defined I MPS . Collecting logical output result of comparator, if I PORT Greater than I MPS The comparator output is 1, and vice versa is 0. Comparator output functionThere are two comparison results, namely the following formula:
；
based on the obtained comparison result, selecting an MPDO counter, an MPS counter and a current comparator, wherein the triggering and sampling clock period of the MPDO counter, the MPS counter and the current comparator is delta T. Providing a cumulative pre-MPDO count value C SUM Accumulating the pre-MPS count value C PORT C, i.e SUM Count for MPDO counter, C PORT For the MPS counter count, the preset initial values are all 0. The positive count steps are all set to 1.
When (when)When the MPDO counter increases by a step size of 1, the MPS counter remains unchanged, namely:
C SUM =C SUM +1；
C PORT= C PORT ；
when (when)When the MPDO counter remains unchanged, the MPS counter increases by a step size of 1, i.e.:
C SUM =C SUM ；
C PORT= C PORT +1；
wherein, in the equation of the accumulated step length, C on the left side of the equal sign SUM To accumulate the MPDO count value, C to the right of the equal sign SUM For accumulating the pre-MPDO count value; c on the left side of the equal sign PORT To accumulate the post-MPS count value, C to the right of the equal sign PORT To accumulate the pre-MPS count value.
The first threshold is reached: c (C) SUM ≥T MPDO In a certain comparison, when the accumulated MPDO count value of the MPDO counter reaches T MPDO Triggering MPS protection at/. DELTA.T; otherwise, the next comparison is carried out after the interval sampling period.
Reaching the third threshold is: c (C) PORT ≥T MPS At, i.e. in a certain comparison, when the accumulated MPS count value of the MPS counter reaches T MPS At the time of delta T, the MPDO counter and the MPS counter are cleared at the same time, and the next comparison is carried out after the sampling period is spaced; at the next comparison, the MPDO counter and the MPS counter are re-counted according to the comparison result.
When the MPDO counter is smaller than the first threshold and the MPS counter is smaller than the third threshold, the next comparison is performed after the sampling period is spaced.
Embodiment four:
referring to fig. 4, in order to solve the problem that the existing power-maintaining characteristic control scheme of the PSE cannot be compatible with the PD with MPS time far below the standard and has noise immunity, the embodiment provides a power-maintaining characteristic control method, which includes the following steps:
step S401, in the process of supplying power to the powered device, a sampling current is obtained at a preset frequency, and the sampling current is compared with a preset holding current, so as to obtain a comparison result.
In this embodiment, an MPDO counter, an MPS counter, a Filter counter, and a comparator are used to periodically obtain a sampling current at a preset frequency, and compare the magnitude relation between the sampling current and a holding current, where a time interval between two adjacent samples at the preset frequency is a sampling period, the holding current is a current threshold defined by a holding power characteristic, and the sampling current is a comparison port current of the comparator; the comparator outputs two comparison results by comparing the magnitude of the sampling current and the magnitude of the holding current, namely, different comparison results are fed back and output according to two comparison conditions of the sampling current being greater than the holding current and the sampling current being less than or equal to the holding current.
In step S402, the MPDO count value, the MPS count value, and the Filter count value are used to represent the values of the MPDO counter, the MPS counter, and the Filter counter, respectively, and the initial value is 0.
In this embodiment, the values of one MPDO counter that occur sequentially in the primary counting process are respectively a pre-accumulation MPDO count value and a post-accumulation MPDO count value, the values of one MPS counter that occur sequentially in the primary counting process are respectively a pre-accumulation MPS count value and a post-accumulation MPS count value, and the values of one Filter counter that occur sequentially in the primary counting process are respectively a pre-accumulation Filter count value and a post-accumulation Filter count value.
In general, poE transmission voltage ranges from 44v to 57v, a Flyback buck voltage reducer is usually required to be configured for a pd powered device, in order to reduce light-load power consumption, the Flyback buck voltage reducer usually works in a light-load burst mode to intermittently draw current from a port, and a single pulse time inside a pulse cluster is usually about tens of microseconds, so that MPS time of a conventional PSE needs to be set to be less than tens of microseconds. Therefore, in the control, a filtering time T is added between adjacent pulses HSY . At a filtering time T HSY The comparator is in a low state when in the middle stateThe corresponding Filter counter starts counting.
And S403, when the sampling current is smaller than or equal to the holding current, if the Filter count value before accumulation is larger than or equal to the fifth threshold value, the MPDO count value is counted forward, the MPS count value is restored to 0, and the Filter count value is kept unchanged. Namely, the accumulated MPDO count value is obtained after the accumulated MPDO count value is counted forward, the accumulated MPS count value is obtained after the accumulated MPS count value is restored to 0, and the accumulated Filter count value is equal to the accumulated Filter count value.
And step S404, when the sampling current is smaller than or equal to the holding current, if the Filter count value before accumulation is smaller than the fifth threshold value, the MPDO count value is counted forward, the MPS count value is kept unchanged, and the Filter count value is counted forward. The MPDO count value before accumulation is obtained after the MPDO count value before accumulation is counted forward, the MPS count value before accumulation is equal to the MPS count value after accumulation, and the Filter count value after accumulation is obtained after the Filter count value before accumulation is counted forward.
Step S405, when the sampling current is greater than the holding current, if the pre-accumulation MPS count value is greater than or equal to the fourth threshold, the MPDO count value, the MPS count value, and the Filter count value are all restored to 0. The MPDO count value before accumulation, the MPS count value before accumulation and the Filter count value before accumulation are all recovered to 0, and then the MPDO count value after accumulation, the MPS count value after accumulation and the Filter count value after accumulation are respectively obtained; the next comparison is performed after the interval sampling period.
In step S406, when the sampling current is greater than the holding current, if the pre-accumulation MPS count value is less than the fourth threshold, the MPDO count value remains unchanged, the MPS count value counts forward, and the Filter count value returns to 0. The MPDO count value before accumulation is accumulated for the second step length to obtain an MPDO count value after accumulation, the MPS count value before accumulation is accumulated for the third step length to obtain an MPS count value after accumulation, and the Filter count value before accumulation is recovered to 0 to obtain an Filter count value after accumulation; the next comparison is performed after the interval sampling period.
In the present embodiment, when the sampling current is greater than the holding current, it is determined whether the MPS count value is greater than or equal to the fourth threshold: if not, keeping the MPDO count value unchanged, counting the MPS count value forward, and continuing updating according to the preset rule after the Filter count value is cleared; if yes, clearing the MPDO count value, the MPS count value and the Filter count value, and then continuing updating according to the preset rule; when the sampling current is smaller than or equal to the holding current, judging whether the Filter count value is larger than or equal to a fifth threshold value, if not, keeping the MPS count value unchanged, and continuously updating according to the preset rule after the MPDO count value and the Filter count value are counted forward; if yes, keeping the Filter count value unchanged, resetting the MPS count value unchanged and counting the MPDO count value forward, and judging whether the MPDO count value is larger than or equal to a first threshold value: if not, continuing updating according to the preset rule, and if so, powering down.
In this embodiment, during a certain counting process: the accumulated MPDO count value is an accumulated MPDO count value obtained by the previous comparison, and the accumulated MPDO count value of the first comparison is 0; the accumulated pre-MPS count value is the accumulated post-MPS count value obtained by the previous comparison, and the accumulated pre-MPS count value of the first comparison is 0; the accumulated Filter count value is the accumulated Filter count value obtained by the previous comparison, and the accumulated Filter count value of the first comparison is 0.
Step S407, when the accumulated MPDO count value is greater than or equal to the first threshold, the powered device powers down. And when the powered device is powered down, the MPS protection is triggered. And when the accumulated MPDO count value is smaller than the first threshold value, performing next comparison after the sampling period.
In this embodiment, when the MPS count value is smaller than the fourth threshold value, the count step of the MPS count value in the forward counting is 1; when the Filter count value is smaller than a fifth threshold value, the counting step sizes of the MPDO count value and the Filter count value in forward counting are both 1; when the Filter count value is greater than or equal to the fifth threshold value, the counting step size of the forward counting of the MPDO count value is 1.
Preferably, the first threshold is T MPDO a/DeltaT, the fourth threshold value is T MPS T is the fifth threshold value HSY /DeltaT; wherein T is MPS To maintain the power characteristic time, T MPDO To maintain the power characteristic off time, T HSY For the filtering time between adjacent pulses, deltaT is at a predetermined frequencySampling period of sampling.
Referring to FIG. 7, an embodiment is provided for defining a specification-compliant MPS parameter T in a PSE device MPDO 、I MPS 、T MPS And T HSY Determining a time window length as t=t MPS +T MPDO +T HSY The port current is noted as I PORT . The embodiment detects the level state of the comparator first, and when the comparator is at low level, the comparator does not output the result, and the result is at the filtering time T HSY An inner part; when the comparator goes high, the port current I is compared by the comparator PORT And defined I MPS . Collecting logical output result of comparator, if I PORT Greater than I MPS The comparator output is 1, and vice versa is 0. Comparator output functionThere are two comparison results, namely the following formula:
；
based on the obtained comparison result, an MPDO counter, an MPS counter, a Filter counter and a current comparator are selected, and the triggering and sampling clock periods of the MPDO counter, the MPS counter, the Filter counter and the current comparator are all delta T. Providing a cumulative pre-MPDO count value C SUM Accumulating the pre-MPS count value C PORT Accumulating the previous Filter count value C Filter C, i.e SUM Count for MPDO counter, C PORT Count for MPS counter, C Filter And counting by a Filter counter, wherein the preset initial values are all 0. The count-up step size is 1. Once the comparator changes from high to low, the Filter counter begins counting, denoted as C Filter Wherein the MPDO counter continues counting during the Filter count, but the MPS counter pauses counting.
When (when)In the case of C Filter ≥T HSY Delta T, MPSO counter increment step 1, MPS meterThe counter is cleared, and the Filter counter remains unchanged, namely:
C SUM =C SUM +1；
C PORT =0；
C Filter =C Filter ；
when (when)In the case of C Filter ＜T HSY The MPDO counter is incremented by a step size of 1, the MPS counter remains unchanged, and the Filter counter is incremented by a step size of 1, namely:
C SUM =C SUM +1；
C PORT =C PORT ；
C Filter =C Filter +1；
when (when)In the case of C PORT ≥T MPS The MPDO counter, the MPS counter and the Filter counter are simultaneously cleared, namely:
C SUM =0；
C PORT =0；
C Filter =0；
when (when)In the case of C PORT ＜T MPS The MPDO counter is kept unchanged, the MPS counter is increased by a step length of 1, and the filter counter is cleared, namely:
C SUM =C SUM ；
C PORT =C PORT +1；
C Filter =0；
wherein, in the equation of the accumulated step length, C on the left side of the equal sign SUM To accumulate the MPDO count value, C to the right of the equal sign SUM For accumulating the pre-MPDO count value; c on the left side of the equal sign PORT To accumulate the post-MPS count value, C to the right of the equal sign PORT Is the accumulated pre-MPS count value; c on the left side of the equal sign Filter To accumulate the post Filter count value, C to the right of the equal sign Filter To accumulate a pre-Filter count value. C in the inequality of the above-mentioned determination condition PORT And C Filter The pre-accumulation MPS count value and the pre-accumulation Filter count value, respectively.
The first threshold is reached: c (C) SUM ≥T MPDO At, i.e. in a certain comparison, when the accumulated MPDO count value reached by the MPDO counter reaches T MPDO Triggering MPS protection at/. DELTA.T; otherwise, the next comparison is carried out after the interval sampling period.
The fourth threshold is reached: c (C) PORT ≥T MPS At, i.e. in a certain comparison, the accumulated pre-MPS count value of the MPS counter reaches T MPS /ΔT。
The fifth threshold is reached: c (C) Filter ≥T HSY At, i.e. in a certain comparison the Filter count value before accumulation of the Filter counter reaches T HSY /ΔT。
Fifth embodiment:
the embodiment also provides a calibration device, which comprises a power receiving device, a network cable link and a power supply device; the number of the powered devices is at least one, and the powered devices are connected with the power supply device through the network cable link and acquire electric energy; the network cable link is used for connecting the power receiving equipment and the power supply equipment; the power supply device is configured to supply power to the power receiving device through the network cable link, and execute the method for controlling the power maintaining characteristic as described above, which is not described in detail herein.
Example six:
the present embodiment also provides a computer readable storage medium storing one or more computer programs, where the one or more computer programs may be executed by one or more processors to implement the method for controlling the power maintaining characteristic as described above, and this embodiment is not described herein in detail.
Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments may be implemented by hardware, or may be implemented by a computer program. When all or part of the functions in the above embodiments are implemented by means of a computer program, the program may be stored in a computer readable storage medium, and the storage medium may include: read-only memory, random access memory, magnetic disk, optical disk, hard disk, etc., and the program is executed by a computer to realize the above-mentioned functions. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, all or part of the functions described above can be realized. In addition, when all or part of the functions in the above embodiments are implemented by means of a computer program, the program may be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash disk, or a removable hard disk, and the program in the above embodiments may be implemented by downloading or copying the program into a memory of a local device or updating a version of a system of the local device, and when the program in the memory is executed by a processor.
The foregoing description of the application has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the application pertains, based on the idea of the application.

Claims (10)

1. A method of maintaining power characteristic control, comprising:
in the process of supplying power to the power receiving equipment, acquiring sampling current at a preset frequency, and comparing the sampling current with a preset holding current to obtain a comparison result;
updating at least the MPDO count value according to a preset rule based on the comparison result, wherein the updating comprises but is not limited to:
when the sampling current is larger than the holding current, the MPDO count value is not increased, and the MPDO count value is continuously updated according to the preset rule;
when the sampling current is smaller than or equal to the holding current, the MPDO count value counts forward, and whether the MPDO count value is larger than or equal to a first threshold value is judged: if not, continuing updating according to the preset rule, and if so, powering down.
2. The method of maintaining power characteristic control according to claim 1, wherein the updating further comprises:
when the sampling current is greater than the holding current, the MPDO count value counts reversely, and whether the MPDO count value is smaller than or equal to 0 is judged: if not, continuing to update according to the preset rule, if so, resetting the MPDO count value, and then continuing to update according to the preset rule.
3. The method of maintaining power characteristic control according to claim 1, wherein the updating further comprises:
when the sampling current is larger than the holding current, the MPDO count value counts reversely; judging whether the MPDO count value is smaller than or equal to a second threshold value: if not, continuing to update according to the preset rule, if so, resetting the MPDO count value, and then continuing to update according to the preset rule;
when the sampling current is smaller than or equal to the holding current, the MPDO count value counts forward, and whether the MPDO count value is larger than or equal to a first threshold value is judged: if not, continuing updating according to the preset rule, and if so, powering down.
4. The power on hold feature control method of claim 3, wherein the first threshold is T MPDO A/Δt, the second threshold being 0;
wherein T is MPS To maintain the power characteristic time, T MPDO To maintain the power characteristic off-time, Δt is the sampling period sampled at a preset frequency; the back counting step length is (T) MPS +T MPDO )/T MPS The method comprises the steps of carrying out a first treatment on the surface of the The count-up step size is 1.
5. The method for controlling the power-on-hold feature of claim 1, wherein updating at least the mpd count value according to a preset rule comprises:
updating an MPDO count value and an MPS count value according to a preset rule;
the updating includes:
when the sampling current is larger than the holding current, the MPSO count value is kept unchanged, the MPS count value is counted forward, and the MPS count value is updated continuously according to the preset rule;
when the sampling current is smaller than or equal to the holding current, the MPS count value is kept unchanged, the MPDO count value is counted in the forward direction, and whether the MPDO count value is larger than or equal to a first threshold value is judged: if not, continuing updating according to the preset rule, and if so, powering down.
6. The method of maintaining power feature control according to claim 5, wherein the updating further comprises:
when the sampling current is larger than the holding current, the MPSO count value is kept unchanged and the MPS count value is counted forward; judging whether the MPS count value is greater than or equal to a third threshold value: if yes, resetting the MPDO count value and the MPS count value, and then continuing updating according to the preset rule; if not, continuing to judge whether the MPDO count value is greater than or equal to a first threshold: if not, continuing updating according to the preset rule, and if so, powering down;
the first threshold is T MPDO a/DeltaT, the third threshold value is T MPS /ΔT；
Wherein T is MPS To maintain the power characteristic time, T MPDO To maintain the power characteristic off-time, Δt is the sampling period sampled at a preset frequency; the count-up step size is 1.
7. The method for controlling the power-on-hold feature of claim 1, wherein updating at least the mpd count value according to a preset rule comprises:
updating an MPDO count value, an MPS count value and a Filter count value according to a preset rule;
the updating includes:
when the sampling current is greater than the holding current, judging whether the MPS count value is greater than or equal to a fourth threshold value: if not, keeping the MPDO count value unchanged, counting the MPS count value forward, and continuing updating according to the preset rule after the Filter count value is cleared; if yes, clearing the MPDO count value, the MPS count value and the Filter count value, and then continuing updating according to the preset rule;
when the sampling current is smaller than or equal to the holding current, judging whether the Filter count value is larger than or equal to a fifth threshold value, if not, keeping the MPS count value unchanged, and continuously updating according to the preset rule after the MPDO count value and the Filter count value are counted forward; if yes, keeping the Filter count value unchanged, resetting the MPS count value unchanged and counting the MPDO count value forward, and judging whether the MPDO count value is larger than or equal to a first threshold value: if not, continuing updating according to the preset rule, and if so, powering down.
8. The method of maintaining power characteristic control according to claim 7, wherein the updating further comprises:
when the MPS count value is smaller than the fourth threshold value, the counting step length of the MPS count value in the forward counting is 1;
when the Filter count value is smaller than a fifth threshold value, the counting step sizes of the MPDO count value and the Filter count value in forward counting are both 1;
when the Filter count value is greater than or equal to a fifth threshold value, the counting step length of the forward counting of the MPDO count value is 1;
the first threshold is T MPDO a/DeltaT, the fourth threshold value is T MPS T is the fifth threshold value HSY /ΔT；
Wherein T is MPS To maintain the power characteristic time, T MPDO To maintain the power characteristic off time, T HSY For the filter time between adjacent pulses, Δt is the sampling period sampled at a preset frequency.
9. The power-maintaining characteristic control system is characterized by comprising a power receiving device, a network cable link and a power supply device;
the number of the powered devices is at least one, and the powered devices are connected with the power supply device through the network cable link and acquire electric energy;
the network cable link is used for connecting the power receiving equipment and the power supply equipment;
the power supply apparatus configured to supply power to the power receiving apparatus through the network cable link, and perform the power maintenance feature control method according to any one of claims 1 to 8.
10. A computer readable storage medium storing one or more computer programs executable by one or more processors to implement the method of preserving power characteristics control of any one of claims 1 to 8.
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