CN103067182B - A kind of method of constrained feed and power supply unit - Google Patents
A kind of method of constrained feed and power supply unit Download PDFInfo
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- CN103067182B CN103067182B CN201210576494.9A CN201210576494A CN103067182B CN 103067182 B CN103067182 B CN 103067182B CN 201210576494 A CN201210576494 A CN 201210576494A CN 103067182 B CN103067182 B CN 103067182B
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Abstract
The embodiment of the invention discloses a kind of method and power supply unit of constrained feed, the method comprises: the electrical parameter obtaining the network equipment, and described electrical parameter at least comprises: detecting resistance value, detecting capacitor value, detection threshold and detecting current value; According to the electrical parameter obtained, judge whether the described network equipment is in short circuit or open-circuit condition; When the described network equipment is not in short circuit or open-circuit condition, according to the electrical parameter obtained, judge whether the described network equipment is non-receiving end equipment, wherein, described non-receiving end equipment is: detecting resistance value is less than 15k Ω, detecting resistance value is greater than 33k Ω or detecting capacitor value is greater than 10 μ F; When the described network equipment is non-power receiving equipment, it is non-receiving end equipment constrained feed.Embodiment of the present invention method not only can realize carrying out constrained feed to non-PD, can avoid after constrained feed rear class risk of equipment damage simultaneously.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of method and power supply unit of constrained feed.
Background technology
Current Power over Ethernet (PoE, Power over Ethernet) technology application is more and more, when existing Basic Ethernet framework without any changes, this technology while for some IP-based terminal transmission data signals, can also provide direct current supply by kind equipment for this reason.A complete PoE system comprises: power supply unit (PSE, Power-Sourcing Equipment) and power receiving equipment (PD, PowerDevice).PSE is the equipment of powering for ethernet client equipment, is also the manager of whole PoE simultaneously.And PD is the PSE load receiving power supply, i.e. the client device of PoE system.Both set up contact based on IEEE802.3at standard, and realizing PSE is that PD powers.
To power agreement to meet PoE in prior art, PSE is in the PD process of powering, need in PD, increase the chip being specifically designed to power supply management and detection, make PSE pass through detect power supply output line between capacitance-resistance value judge whether PD equipment exists, after judging that PD equipment exists, PSE, to PD sizing of equipment, starts to power to this PD equipment.In prior art, PSE can carry out constrained feed to non-PD equipment, there is serious potential safety hazard when constrained feed, as: easily there is spark phenomenon after plug netting twine, or rear class device damage etc. under constrained feed.
Therefore, current PSE power management scheme, if when detecting that load is non-PD equipment, disconnection is supplied electrical connection by PSE.PSE can not carry out safe power supply to non-PD equipment.
Summary of the invention
Embodiments provide a kind of method and power supply unit of constrained feed, make PSE can carry out constrained feed to non-PD equipment, and avoid safety risk.
Embodiments provide a kind of method of constrained feed, described method comprises:
Obtain the electrical parameter of the network equipment, described electrical parameter at least comprises: detecting resistance value, detecting capacitor value, detection threshold and detecting current value;
According to the electrical parameter obtained, judge whether the described network equipment is in short circuit or open-circuit condition;
When the described network equipment is not in short circuit or open-circuit condition, according to the electrical parameter obtained, judge whether the described network equipment is non-receiving end equipment, wherein, described non-receiving end equipment is: detecting resistance value is less than 15k Ω, detecting resistance value is greater than 33k Ω or detecting capacitor value is greater than 10 μ F;
When the described network equipment is non-power receiving equipment, it is non-receiving end equipment constrained feed.
Preferably, when the described network equipment is non-power receiving equipment, described method also comprises:
For non-receiving end sizing of equipment;
To the non-receiving end equipment constrained feed after classification.
Preferably, the described electrical parameter according to obtaining, judges whether the described network equipment is in short circuit or open-circuit condition, specifically comprises:
When the difference of voltage VAGND and output voltage VO UT is safely less than 1V, judge that the described network equipment is short-circuit condition;
When detecting current is for being less than 20 microamperes, judge that the described network equipment is open-circuit condition.
The embodiment of the present invention additionally provides a kind of power supply unit, and described equipment comprises: acquiring unit, the first judging unit, the second judging unit, and power supply unit;
Described acquiring unit, for obtaining the electrical parameter of the network equipment, described electrical parameter at least comprises: detecting resistance value, detecting capacitor value, detection threshold, and detecting current value;
Described first judging unit, for according to the electrical parameter obtained, judges whether the described network equipment is in short circuit or open-circuit condition;
Described second judging unit, for when the described network equipment is not in short circuit or open-circuit condition, according to the electrical parameter obtained, judge whether the described network equipment is non-receiving end equipment, wherein, described non-receiving end equipment is: detecting resistance value is less than 15k Ω, detecting resistance value is greater than 33k Ω, or detecting capacitor value is greater than 10 μ F;
Described power supply unit, for being non-receiving end equipment constrained feed.
Preferably, described equipment also comprises:
Stage unit, for when the described network equipment is non-power receiving equipment, be non-receiving end sizing of equipment;
Described power supply unit, specifically for the non-receiving end equipment constrained feed after classification.
Preferably,
Described first judging unit, specifically for when the difference of voltage VAGND and output voltage VO UT is safely less than 1V, judges that the described network equipment is short-circuit condition; When detecting current is for being less than 20 microamperes, judge that the described network equipment is open-circuit condition.As can be seen from the above technical solutions, the embodiment of the present invention has the following advantages: first judge to cause unsafe factor of powering, the i.e. factor such as short circuit or open circuit, non-PD equipment right again carries out constrained feed, the method not only can realize carrying out constrained feed to non-PD equipment, and to rear class risk of equipment damage after avoiding constrained feed.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is POE system framework simplified schematic diagram;
Fig. 2 provides a kind of method flow simplified schematic diagram of constrained feed for the embodiment of the present invention one;
Fig. 3 provides a kind of method flow simplified schematic diagram of constrained feed for the embodiment of the present invention two;
A kind of power supply unit simplified schematic diagram that Fig. 4 provides for the embodiment of the present invention three.
Embodiment
A complete POE system comprises feeder ear equipment (PSE, Power Sourcing Equipment) and receiving end equipment (PD, Powered Device) two parts.PSE device is the equipment of powering for ethernet client equipment, is also the manager of whole POE Power over Ethernet process simultaneously.And PD equipment is the PSE load accepting power supply, i.e. the client device of POE system, as IP phone, network security video camera, access point (AP, Access Point) and palmtop PC, or other ethernet devices many such as charger for mobile phone.Both set up the informational linkage of the aspect such as connection, device type, power consumption level about receiving end PD equipment based on IEEE802.3af standard, and the PSE that takes this as a foundation is powered to PD equipment by Ethernet.
In POE system, PSE is by netting twine power supply to the device, and wherein, five class netting twines of standard have four pairs of twisted-pair feeders, but only use two couple wherein in l0MBASE-T and 100MBASE-T.When application data pin is powered, DC power supply is added in the mid point of transmission transformer, does not affect the transmission of data.In this manner, line can be any polarity to 1,2 and line to 3,6 as shown in Figure 1, respectively can as the power line pair of power supply.
Set up the informational linkage of the aspect such as connection, device type, power consumption level about receiving end PD equipment based on IEEE802.3af standard, and the PSE that takes this as a foundation is powered to PD equipment by Ethernet.
The main supplied character parameter of POE standard electric power system is:
1, voltage is between 44 ~ 57V, and representative value is 48V.
2, allow maximum current to be 550mA, maximum starting current is 500mA.
3, exemplary operation electric current is 10 ~ 350mA, and it is 350 ~ 500mA that overload detects electric current.
4, under idle condition, maximum demand electric current is 5mA.
5, for PD equipment provides the electrical power request of 3.84 ~ 12.95W, five grades, maximumly 13W is no more than.
Based on the above-mentioned explanation to POE system, in known prior art, only safe power supply can be carried out to the PD equipment detected.At detection-phase, PSE determines whether there is a 25k Ω featured resistance by limited electric current and voltage.An effective PD equipment must present the resistance of a resistance between 23.75k Ω and 26.25k Ω at feeder ear, and corresponding voltage scope is between 2.7V and 10.1V, and shunt capacitance is between 0.05 μ F and 0.12 μ F.In prior art, to detecting that resistance is less than 15k Ω, or 33k Ω can not be greater than, or the equipment that electric capacity is greater than 10 μ F is powered.For convenience of description, the resistance detected is less than 15k Ω, or is greater than 33k Ω, or the equipment that electric capacity is greater than 10 μ F is called " non-PD equipment ".
Equipment of can judging in the embodiment of the present invention is non-PD equipment, know be non-PD equipment after, can power for this non-PD equipment, compare with prior art in only can carry out safe power supply to PD equipment, the embodiment of the present invention can be powered to non-PD equipment, owing to judging that the condition of non-PD equipment is, detect that the resistance of equipment is less than 15k Ω, or be greater than 33k Ω, or electric capacity is greater than 10 μ F, 15k Ω is less than when meeting resistance, or be greater than 33k Ω, or electric capacity is greater than the equipment of 10 μ F after PSE powers, due to by short circuit, clear and definite the distinguishing of open-circuit condition, and will not power, the method is struck sparks after can avoiding plug netting twine, or to rear class risk of equipment damage after constrained feed.Illustrate see following embodiment.
Embodiment one
The embodiment of the present invention provides a kind of method of constrained feed, and as shown in Figure 2, the method comprises:
Step S100, obtain the electrical parameter of the network equipment, this electrical parameter at least comprises: detecting resistance value, and detecting capacitor value, detection threshold, detecting current value.Wherein, the network equipment specifically refers to and the load that PSE network is connected.
Step S102, according to the electrical parameter obtained, judges whether the described network equipment is in short circuit or open-circuit condition.
When voltage VAGND and PSE output voltage VO UT difference are less than 1V safely, namely during VAGND-VOUT_<1V, judge that the network equipment is short-circuit condition; When detecting current is for being less than 20 microamperes (uA), judge that the network equipment is open-circuit condition.
Step S104, when the described network equipment is not in short circuit or open-circuit condition, according to the electrical parameter obtained, judges whether the described network equipment is non-receiving end equipment.Wherein, non-receiving end equipment is: detecting resistance value is less than 15k Ω, detecting resistance value is greater than 33k Ω, or detecting capacitor value is greater than 10 μ F.In prior art, regulation detecting resistance value is PD equipment between 15k Ω to 33k Ω, is only PD device security and powers.And can power to non-PD equipment in the embodiment of the present invention.
Step S106, PSE are that non-receiving end equipment is powered.Namely PSE is eliminating after the network equipment is short circuit or open-circuit condition, is the non-PD equipment constrained feed judged.
By the explanation of the above-mentioned method to a kind of constrained feed that the embodiment of the present invention provides, the method is being judged to cause power unsafe factor, the i.e. factor such as short circuit, open circuit, then carries out constrained feed to the non-PD equipment judged under safe power supply state.The method not only can realize carrying out constrained feed to non-PD equipment, strikes sparks after can avoiding plug netting twine simultaneously, or to rear class risk of equipment damage after constrained feed.
Embodiment two
The embodiment of the present invention provides a kind of method of constrained feed, and as shown in Figure 3, the method comprises:
The electrical parameter of step 200:PSE Sampling network equipment, this electrical parameter at least comprises: detecting resistance value, detecting capacitor value, detection threshold, and detecting current value.
Wherein, the electrical parameter of PSE Sampling network equipment can be specifically detect power supply output line to upper electrical parameter, such as, detects power line in Fig. 1 to the electrical parameter on 1,2 and/or 3,6.
Step S202, PSE, according to the electrical parameter detected, judge whether the network equipment is in short circuit or open-circuit condition.
When can be specifically VAGND-VOUT_<1V, judge that the network equipment is short-circuit condition; When detecting current is for being less than 20 microamperes (uA), judge that the network equipment is open-circuit condition.
Step S204, when the described network equipment is not in short circuit or open-circuit condition, PSE, according to the electrical parameter detected, judges whether the described network equipment is non-PD equipment.Can be specifically that the detecting resistance value detected is less than 15k Ω, detecting resistance value is greater than 33k Ω, or detecting capacitor value be greater than 10 μ F.Wherein, in prior art, regulation detecting resistance value is PD equipment between 15k Ω to 33k Ω, powers only to PD equipment.And can power for non-PD device security in the embodiment of the present invention.
Step S206, PSE are that non-PD equipment carries out classification.PSE can detect different electric currents to judge the power output of non-PD equipment.Wherein, to the progressive operation of non-PD equipment can with reference in prior art to the method for PD classification.Such as: PSE to apply between a 15.5V ~ 20.5V voltage to measure its electric current to non-PD equipment.The spendable minimum PSE power of non-PD equipment is determined by table 1.
The spendable minimum PSE power of the non-PD of table 1.
PoE classification
By step S206, classification is carried out to non-PD equipment, thus avoid the excessive equipment that causes of power consumption gap or system failure.
Step S208, PSE eliminate the network equipment be short circuit, open circuit after, be the non-PD equipment constrained feed after classification.
By the explanation of the above-mentioned method to a kind of constrained feed that the embodiment of the present invention provides, further, classification is carried out to non-PD, thus avoid the excessive equipment that causes of power consumption gap or system failure.
Embodiment three
Embodiments provide a kind of power supply unit, as shown in Figure 4, this power supply unit comprises: acquiring unit 401, the first judging unit 402, second judging unit 403, and power supply unit 404.
Acquiring unit 401, for obtaining the electrical parameter of the network equipment, this electrical parameter at least comprises: detecting resistance value, detecting capacitor value, detection threshold, and detecting current value.
First judging unit 402, for according to the electrical parameter obtained, according to the electrical parameter obtained, judges whether the described network equipment is in short circuit, open-circuit condition.When first judging unit 402 can be specifically VAGND-VOUT_<1V, judge that the network equipment is short-circuit condition; When detecting current is for being less than 20 microamperes (uA), judge that the network equipment is open-circuit condition.
Second judging unit 403, for when the described network equipment is not in short circuit or open-circuit condition, according to the electrical parameter obtained, judge whether the described network equipment is non-receiving end equipment, wherein, described non-receiving end equipment is: the detecting resistance value detected is less than 15k Ω, and detecting resistance value is greater than 33k Ω, or detecting capacitor value is greater than 10 μ F.Wherein, in prior art, regulation detecting resistance value is PD equipment between 15k Ω to 33k Ω, powers only to PD equipment.And can power for non-PD device security in the embodiment of the present invention.
Power supply unit 404, for when the described network equipment is non-power receiving equipment, is non-PD equipment constrained feed.
By the above-mentioned a kind of power supply unit provided the embodiment of the present invention, the method is being judged to cause power unsafe factor, the i.e. factor such as short circuit, open circuit, then carries out constrained feed to the non-PD equipment judged.The method not only can realize carrying out constrained feed to non-PD, strikes sparks after can avoiding plug netting twine simultaneously, or to rear class risk of equipment damage after constrained feed.
Preferably, this power supply unit can also comprise: stage unit 405, for carrying out classification to non-PD.Stage unit 405 can detect different electric currents to judge the power output of non-PD equipment.Wherein, to the progressive operation of non-PD equipment can with reference in prior art to the method for PD sizing of equipment.
By stage unit 405, classification is carried out to non-PD equipment, thus avoid the excessive equipment that causes of power consumption gap or system failure.
Then power supply unit, specifically for the non-PD equipment constrained feed after classification.
Can with reference to the method explanation in above-described embodiment one, two to the detailed description of the power supply unit that the present embodiment provides.Do not repeat herein.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
Above the method for a kind of constrained feed provided by the present invention and power supply unit are described in detail, for one of ordinary skill in the art, according to the thought of the embodiment of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (4)
1. a method for constrained feed, is characterized in that, described method comprises:
Obtain the electrical parameter of the network equipment, described electrical parameter at least comprises: detecting resistance value, detecting capacitor value, detection threshold and detecting current value;
According to the electrical parameter obtained, judge whether the described network equipment is in short circuit or open-circuit condition;
When the described network equipment is not in short circuit or open-circuit condition, according to the electrical parameter obtained, judge whether the described network equipment is non-receiving end equipment, wherein, described non-receiving end equipment is: detecting resistance value is less than 15k Ω, detecting resistance value is greater than 33k Ω or detecting capacitor value is greater than 10 μ F;
When the described network equipment is non-power receiving equipment, it is non-receiving end equipment constrained feed;
The described electrical parameter according to obtaining, judges whether the described network equipment is in short circuit or open-circuit condition, specifically comprises:
When the difference of voltage VAGND and output voltage VO UT is safely less than 1V, judge that the described network equipment is short-circuit condition;
When detecting current is for being less than 20 microamperes, judge that the described network equipment is open-circuit condition.
2. method according to claim 1, it is characterized in that, when the described network equipment is non-power receiving equipment, described method also comprises:
For non-receiving end sizing of equipment;
To the non-receiving end equipment constrained feed after classification.
3. a power supply unit, is characterized in that, described equipment comprises: acquiring unit, the first judging unit, the second judging unit, and power supply unit;
Described acquiring unit, for obtaining the electrical parameter of the network equipment, described electrical parameter at least comprises: detecting resistance value, detecting capacitor value, detection threshold, and detecting current value;
Described first judging unit, for according to the electrical parameter obtained, judges whether the described network equipment is in short circuit or open-circuit condition;
Described second judging unit, for when the described network equipment is not in short circuit or open-circuit condition, according to the electrical parameter obtained, judge whether the described network equipment is non-receiving end equipment, wherein, described non-receiving end equipment is: detecting resistance value is less than 15k Ω, detecting resistance value is greater than 33k Ω, or detecting capacitor value is greater than 10 μ F;
Described power supply unit, for being non-receiving end equipment constrained feed;
Described first judging unit, specifically for when the difference of voltage VAGND and output voltage VO UT is safely less than 1V, judges that the described network equipment is short-circuit condition; When detecting current is for being less than 20 microamperes, judge that the described network equipment is open-circuit condition.
4. equipment according to claim 3, it is characterized in that, described equipment also comprises:
Stage unit, for when the described network equipment is non-power receiving equipment, is non-receiving end sizing of equipment;
Described power supply unit, specifically for the non-receiving end equipment constrained feed after classification.
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| CN201210576494.9A CN103067182B (en) | 2012-12-26 | 2012-12-26 | A kind of method of constrained feed and power supply unit |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592558B (en) * | 2013-08-06 | 2016-12-28 | 福建星网锐捷网络有限公司 | The detection method of Ethernet power receiving equipment minus earth exception and device |
| CN105515787A (en) * | 2014-09-24 | 2016-04-20 | 鸿富锦精密工业（深圳）有限公司 | Network port and Ethernet device |
| TW201613304A (en) | 2014-09-24 | 2016-04-01 | Hon Hai Prec Ind Co Ltd | Network port and ethernet device |
| CN106253357B (en) * | 2016-08-23 | 2019-01-11 | 锐捷网络股份有限公司 | A kind of method of supplying power to and power supply unit |
| CN106817808A (en) * | 2017-03-15 | 2017-06-09 | 中冶京诚工程技术有限公司 | A kind of illumination control method and system based on POE technologies |
| CN113777522B (en) * | 2020-06-10 | 2022-10-04 | 华为技术有限公司 | Power supply detection device and method and computer program product thereof |
| CN113125877B (en) * | 2021-03-02 | 2022-12-06 | 华为技术有限公司 | PD detection equipment for powered device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101124772A (en) * | 2005-01-25 | 2008-02-13 | 凌特公司 | System for providing power over communication cable having mechanism for determining resistance of communication cable |
| CN101232384A (en) * | 2008-02-25 | 2008-07-30 | 福建星网锐捷网络有限公司 | Method and device for testing switch with Ethernet power supply function |
| CN101371492A (en) * | 2006-01-17 | 2009-02-18 | 美国博通公司 | Power over Ethernet controller integrated circuit architecture |
| CN101908987A (en) * | 2010-08-09 | 2010-12-08 | 中兴通讯股份有限公司 | Method and device for detecting capacity of power-sourcing equipment |
-
2012
- 2012-12-26 CN CN201210576494.9A patent/CN103067182B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101124772A (en) * | 2005-01-25 | 2008-02-13 | 凌特公司 | System for providing power over communication cable having mechanism for determining resistance of communication cable |
| CN101371492A (en) * | 2006-01-17 | 2009-02-18 | 美国博通公司 | Power over Ethernet controller integrated circuit architecture |
| CN101232384A (en) * | 2008-02-25 | 2008-07-30 | 福建星网锐捷网络有限公司 | Method and device for testing switch with Ethernet power supply function |
| CN101908987A (en) * | 2010-08-09 | 2010-12-08 | 中兴通讯股份有限公司 | Method and device for detecting capacity of power-sourcing equipment |
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