CN103067182A - Method for forced power supply and power-supply device - Google Patents
Method for forced power supply and power-supply device Download PDFInfo
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- CN103067182A CN103067182A CN2012105764949A CN201210576494A CN103067182A CN 103067182 A CN103067182 A CN 103067182A CN 2012105764949 A CN2012105764949 A CN 2012105764949A CN 201210576494 A CN201210576494 A CN 201210576494A CN 103067182 A CN103067182 A CN 103067182A
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Abstract
The invention discloses a method for forced power supply and a power-supply device. The method for the forced power supply includes obtaining of electrical parameters of a network device. The electrical parameters at least include a detected resistance value, a detected capacitive reactance value, a detected voltage value and a detected current value. According to the obtained electrical parameters, the network device is judged whether to be in a status of short circuits or open circuits or not. If the network device is not in the status of the short circuits or the open circuits, the network device is judged to be whether a non-receiving-end device or not according to the obtained electrical parameters, wherein the non-receiving-end device is characterized in that a detected resistance value is smaller than 15 kilohm (k Omega), a detected resistance value is larger than 33komega, or a detected capacitive reactance is larger than 10 microfarad (Mu F). If the network device is a non-power device (PD), power is supplied to the non-receiving-end device. Not only can the power be supplied in force to the non-PD, meanwhile but also damage risks to a backward stage device after the forced power supply can be avoided.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method and power supply unit of constrained feed.
Background technology
Present Power over Ethernet (PoE, Power over Ethernet) technology is used more and more, in existing Basic Ethernet framework situation without any changes, this technology is when being some IP-based terminal transmission data-signals, and kind equipment provides direct current supply 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 for the ethernet client power devices, also is the manager of whole PoE simultaneously.And PD is the PSE load that receives power supply, i.e. the client device of PoE system.Both realize that based on the contact of IEEE802.3at normalization PSE is the PD power supply.
In the prior art in order to satisfy PoE power supply agreement, PSE is in the process of PD power supply, need in PD, increase the chip that is specifically designed to power supply management and detection, so that PSE by detect power supply output line between the capacitance-resistance value judge whether PD equipment exists, after judging that PD equipment exists, PSE begins this PD power devices the PD sizing of equipment.In the prior art, PSE can carry out constrained feed to non-PD equipment, has serious potential safety hazard when constrained feed, as: plug is prone to spark phenomenon behind the netting twine, perhaps rear class device damage etc. under the constrained feed.
Therefore, present PSE power management scheme, if when detecting load right and wrong PD equipment, PSE will disconnect for being electrically connected.PSE can not carry out safe power supply to non-PD equipment.
Summary of the invention
The embodiment of the invention provides a kind of method and power supply unit of constrained feed, so that PSE can carry out constrained feed to non-PD equipment, and has avoided the safety risk.
The embodiment of the invention provides a kind of method of constrained feed, and described method comprises:
Obtain the electrical parameter of the network equipment, described electrical parameter comprises at least: detecting resistance value, detecting capacitor value, detection threshold and detecting current value;
According to the electrical parameter that obtains, 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 that obtains, judge whether the described network equipment is non-receiving end equipment, wherein, described non-receiving end equipment is: the detecting resistance value less than 15k Ω, the detecting resistance value greater than 33k Ω or the detecting capacitor value greater than 10 μ F;
When the described network equipment is non-power receiving equipment, be non-receiving end equipment constrained feed.
Preferably, when the described network equipment was non-power receiving equipment, described method also comprised:
Be non-receiving end sizing of equipment;
To the non-receiving end equipment constrained feed after the classification.
Preferably, the electrical parameter that described basis is obtained, judge that whether the described network equipment is in short circuit or open-circuit condition, specifically comprises:
When the difference of safely voltage VAGND and output voltage VO UT during less than 1V, judge that the described network equipment is short-circuit condition;
When detecting current is during less than 20 microamperes, judge that the described network equipment is open-circuit condition.
The embodiment of the invention also 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 the electrical parameter that obtains the network equipment, described electrical parameter comprises at least: detecting resistance value, detecting capacitor value, detection threshold, and detecting current value;
Described the first judging unit is used for judging according to the electrical parameter that obtains whether the described network equipment is in short circuit or open-circuit condition;
Described the second judging unit, be used for when the described network equipment is not in short circuit or open-circuit condition, according to the electrical parameter that obtains, judge whether the described network equipment is non-receiving end equipment, wherein, described non-receiving end equipment is: the detecting resistance value greater than 33k Ω, is perhaps detected capacitor value greater than 10 μ F less than 15k Ω, detecting resistance value;
Described power supply unit is used to non-receiving end equipment constrained feed.
Preferably, described equipment also comprises:
Stage unit is used for when the described network equipment is non-power receiving equipment,, be non-receiving end sizing of equipment;
Described power supply unit, concrete being used for the non-receiving end equipment constrained feed after the classification.
Preferably,
Described the first judging unit, concrete when being used for difference as safely voltage VAGND and output voltage VO UT less than 1V, judge that the described network equipment is short-circuit condition; When detecting current is during 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 invention has the following advantages: judge first and cause the unsafe factor of powering, be the factors such as short circuit or open circuit, right non-PD equipment carries out constrained feed again, the method not only can realize non-PD equipment is carried out constrained feed, and has avoided behind the constrained feed the rear class risk of equipment damage.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is POE system architecture simplified schematic diagram;
Fig. 2 provides a kind of method flow simplified schematic diagram of constrained feed for the embodiment of the invention one;
Fig. 3 provides a kind of method flow simplified schematic diagram of constrained feed for the embodiment of the invention two;
A kind of power supply unit simplified schematic diagram that Fig. 4 provides for the embodiment of the 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 equipment is the equipment for the ethernet client power devices, also is the manager of whole POE Power over Ethernet process simultaneously.And PD equipment is the PSE load of accepting power supply, i.e. the client device of POE system, and such as IP phone, network security video camera, access point (AP, Access Point) and palmtop PC, or many other ethernet devices such as charger for mobile phone.Both are based on the informational linkage of the aspects such as the connection of the relevant receiving end PD of IEEE802.3af normalization equipment, device type, power consumption level, and the PSE that takes this as a foundation by Ethernet to the PD power devices.
In the POE system, to power devices, wherein, five class netting twines of standard have four pairs of twisted-pair feeders to PSE by netting twine, but only use two couple wherein in l0MBASE-T and 100MBASE-T.When the application data pin is powered, the DC power supply is added in the mid point of transmission transformer, do not affect data transfer.In this manner, as shown in Figure 1 line to 1,2 and line can be any polarity to 3,6, can be used as respectively the power line pair of power supply.
Based on the informational linkage of the aspects such as the connection of the relevant receiving end PD of IEEE802.3af normalization equipment, device type, power consumption level, and the PSE that takes this as a foundation by Ethernet to the PD power devices.
The main supplied character parameter of POE standard electric power system is:
1, voltage is between 44～57V, and representative value is 48V.
2, allowing maximum current is 550mA, and maximum starting current is 500mA.
3, the exemplary operation electric current is 10～350mA, and it is 350～500mA that overload detects electric current.
4, under idle condition, the maximum demand electric current is 5mA.
5, the electrical power request of five grades of 3.84～12.95W is provided for PD equipment, and maximum is no more than 13W.
Based on the above-mentioned explanation to the POE system, only can carry out safe power supply to detected PD equipment in the prior art as can be known.At detection-phase, PSE determines whether to exist 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 the 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 the prior art, can not be to detecting resistance less than 15k Ω, or greater than 33k Ω, perhaps electric capacity is greater than the power devices of 10 μ F.For convenience of description, less than 15k Ω, or greater than 33k Ω, perhaps electric capacity is called " non-PD equipment " greater than the equipment of 10 μ F with detected resistance.
Can judge equipment right and wrong PD equipment in the embodiment of the invention, after knowing right and wrong PD equipment, can be this non-PD power devices, compare with prior art in only can carry out safe power supply to PD equipment, the embodiment of the invention can be to non-PD power devices, owing to judge the condition of non-PD equipment be, detect the resistance of equipment less than 15k Ω, or greater than 33k Ω, perhaps electric capacity is greater than 10 μ F, when satisfying resistance less than 15k Ω, or greater than 33k Ω, perhaps electric capacity greater than the equipment of 10 μ F after the PSE power supply, because with short circuit, what open-circuit condition was clear and definite distinguishes, and will not power, the method is struck sparks after can avoiding plugging netting twine, perhaps behind the constrained feed to the rear class risk of equipment damage.Specify referring to following embodiment.
Embodiment one
The embodiment of the invention provides a kind of method of constrained feed, and as shown in Figure 2, the method comprises:
Step S100 obtains the electrical parameter of the network equipment, and this electrical parameter comprises at least: detecting resistance value, and detecting capacitor value, detection threshold, detecting current value.Wherein, the network equipment specifically refers to the load with the PSE network connection.
Step S102 according to the electrical parameter that obtains, judges whether the described network equipment is in short circuit or open-circuit condition.
When safely voltage VAGND and PSE output voltage VO UT difference less than 1V, namely during VAGND-VOUT_＜1V, the judgement network equipment is short-circuit condition; When detecting current is during less than 20 microamperes (uA), the judgement 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 that obtains, judges whether the described network equipment is non-receiving end equipment.Wherein, non-receiving end equipment is: the detecting resistance value greater than 33k Ω, is perhaps detected capacitor value greater than 10 μ F less than 15k Ω, detecting resistance value.Regulation detecting resistance value is PD equipment between 15k Ω to 33k Ω in the prior art, only is the power supply of PD device security.And can be to non-PD power devices in the embodiment of the invention.
Step S106, PSE are non-receiving end power devices.Be PSE after having got rid of the network equipment and being short circuit or open-circuit condition, be the non-PD equipment constrained feed of judging.
The explanation of the method by above-mentioned a kind of constrained feed that the embodiment of the invention is provided, the method cause the unsafe factor of powering judging, and namely the factor such as short circuit, open circuit is carried out constrained feed to the non-PD equipment that the safe power supply state judges out again.The method not only can realize non-PD equipment is carried out constrained feed, strike sparks after simultaneously can avoiding plugging netting twine, perhaps behind the constrained feed to the rear class risk of equipment damage.
Embodiment two
The embodiment of the 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 comprises at least: detecting resistance value, detecting capacitor value, detection threshold, and detecting current value.
Wherein, the electrical parameter of PSE Sampling network equipment specifically can be to detect power supply output line to upper electrical parameter, for example detects power line among Fig. 1 to the electrical parameter on 1,2 and/or 3,6.
Step S202, PSE judges according to the electrical parameter that detects whether the network equipment is in short circuit or open-circuit condition.
In the time of specifically can being VAGND-VOUT_＜1V, the judgement network equipment be short-circuit condition; When detecting current is during less than 20 microamperes (uA), the judgement network equipment is open-circuit condition.
Step S204, when the described network equipment was not in short circuit or open-circuit condition, PSE judged according to the electrical parameter that detects whether the described network equipment is non-PD equipment.Specifically can be detected detecting resistance value less than 15k Ω, detecting resistance value greater than 33k Ω, perhaps detect capacitor value greater than 10 μ F.Wherein, regulation detecting resistance value is PD equipment between 15k Ω to 33k Ω in the prior art, only gives the PD power devices.And can be non-PD device security power supply in the embodiment of the invention.
Step S206, PSE are that non-PD equipment carries out classification.PSE can detect the power output that different electric currents is judged non-PD equipment.Wherein, to the progressive operation of non-PD equipment can with reference in the prior art to the method for PD classification.For example: PSE applies voltage between a 15.5V ~ 20.5V to non-PD equipment and measures its electric current.The spendable minimum PSE power of non-PD equipment is pressed table 1 and is determined.
The spendable minimum PSE power of the non-PD of table 1.
The PoE classification
By step S206 non-PD equipment is carried out classification, thereby avoid the excessive equipment that causes of power consumption gap or system failure.
Step S208, PSE got rid of the network equipment be short circuit, the open circuit after, be the non-PD equipment constrained feed after the classification.
The explanation of the method by above-mentioned a kind of constrained feed that the embodiment of the invention is provided further, is carried out classification to non-PD, thereby is avoided the excessive equipment that causes of power consumption gap or system failure.
Embodiment three
The embodiment of the invention provides a kind of power supply unit, and as shown in Figure 4, this power supply unit comprises: acquiring unit 401, the first judging units 402, the second judging units 403, and power supply unit 404.
Acquiring unit 401, for the electrical parameter that obtains the network equipment, this electrical parameter comprises at least: detecting resistance value, detecting capacitor value, detection threshold, and detecting current value.
The first judging unit 402 is used for according to the electrical parameter that obtains, judging whether the described network equipment is in short circuit, open-circuit condition according to the electrical parameter that obtains.When the first judging unit 402 specifically can be VAGND-VOUT_＜1V, the judgement network equipment was short-circuit condition; When detecting current is during less than 20 microamperes (uA), the judgement network equipment is open-circuit condition.
The second judging unit 403, be used for when the described network equipment is not in short circuit or open-circuit condition, according to the electrical parameter that obtains, judge whether the described network equipment is non-receiving end equipment, wherein, described non-receiving end equipment is: detected detecting resistance value is less than 15k Ω, and the detecting resistance value is perhaps detected capacitor value greater than 10 μ F greater than 33k Ω.Wherein, regulation detecting resistance value is PD equipment between 15k Ω to 33k Ω in the prior art, only gives the PD power devices.And can be non-PD device security power supply in the embodiment of the invention.
By above-mentioned a kind of power supply unit that the embodiment of the invention is provided, the method causes the unsafe factor of powering judging, and namely the factor such as short circuit, open circuit is carried out constrained feed to the non-PD equipment of judging again.The method not only can realize non-PD is carried out constrained feed, strike sparks after simultaneously can avoiding plugging netting twine, perhaps behind the constrained feed to the rear class risk of equipment damage.
Preferably, this power supply unit can also comprise: stage unit 405 is used for non-PD is carried out classification.Stage unit 405 can detect the power output that different electric currents is judged non-PD equipment.Wherein, to the progressive operation of non-PD equipment can with reference in the prior art to the method for PD sizing of equipment.
Carry out classification by 405 pairs of non-PD equipment of stage unit, thereby avoid the excessive equipment that causes of power consumption gap or system failure.
Then power supply unit specifically is used for the non-PD equipment constrained feed after the classification.
The detailed description of the power supply unit that present embodiment is provided can be with reference to the method explanation in above-described embodiment one, two.Do not repeat herein.
One of ordinary skill in the art will appreciate that all or part of step that realizes in above-described embodiment method is to come the relevant hardware of instruction to finish by program, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
More than method and the power supply unit of a kind of constrained feed provided by the present invention is described in detail, for one of ordinary skill in the art, thought according to the embodiment of the invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. the method for a constrained feed is characterized in that, described method comprises:
Obtain the electrical parameter of the network equipment, described electrical parameter comprises at least: detecting resistance value, detecting capacitor value, detection threshold and detecting current value;
According to the electrical parameter that obtains, 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 that obtains, judge whether the described network equipment is non-receiving end equipment, wherein, described non-receiving end equipment is: the detecting resistance value less than 15k Ω, the detecting resistance value greater than 33k Ω or the detecting capacitor value greater than 10 μ F;
When the described network equipment is non-power receiving equipment, be non-receiving end equipment constrained feed.
2. described method according to claim 1 is characterized in that when the described network equipment was non-power receiving equipment, described method also comprised:
Be non-receiving end sizing of equipment;
To the non-receiving end equipment constrained feed after the classification.
3. described method according to claim 1 is characterized in that the electrical parameter that described basis is obtained judges that whether the described network equipment is in short circuit or open-circuit condition, specifically comprises:
When the difference of safely voltage VAGND and output voltage VO UT during less than 1V, judge that the described network equipment is short-circuit condition;
When detecting current is during less than 20 microamperes, judge that the described network equipment is open-circuit condition.
4. 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 the electrical parameter that obtains the network equipment, described electrical parameter comprises at least: detecting resistance value, detecting capacitor value, detection threshold, and detecting current value;
Described the first judging unit is used for judging according to the electrical parameter that obtains whether the described network equipment is in short circuit or open-circuit condition;
Described the second judging unit, be used for when the described network equipment is not in short circuit or open-circuit condition, according to the electrical parameter that obtains, judge whether the described network equipment is non-receiving end equipment, wherein, described non-receiving end equipment is: the detecting resistance value greater than 33k Ω, is perhaps detected capacitor value greater than 10 μ F less than 15k Ω, detecting resistance value;
Described power supply unit is used to non-receiving end equipment constrained feed.
5. described equipment according to claim 4 is characterized in that described equipment also comprises:
Stage unit is used for when the described network equipment is non-power receiving equipment,, be non-receiving end sizing of equipment;
Described power supply unit, concrete being used for the non-receiving end equipment constrained feed after the classification.
6. described equipment according to claim 4 is characterized in that,
Described the first judging unit, concrete when being used for difference as safely voltage VAGND and output voltage VO UT less than 1V, judge that the described network equipment is short-circuit condition; When detecting current is during less than 20 microamperes, judge that the described network equipment is open-circuit condition.
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| CN103592558A (en) * | 2013-08-06 | 2014-02-19 | 福建星网锐捷网络有限公司 | Method and device for detecting grounding abnormity |
| 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 |
| CN106253357A (en) * | 2016-08-23 | 2016-12-21 | 锐捷网络股份有限公司 | A kind of method of supplying power to and electric supply installation |
| 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 |
| US10079688B2 (en) | 2014-09-24 | 2018-09-18 | Hon Hai Precision Industry Co., Ltd. | Network port and ethernet device integrating powered device and power sourcing equivalent in a port |
| CN113125877A (en) * | 2021-03-02 | 2021-07-16 | 华为技术有限公司 | PD detection equipment for powered device |
| CN113777522A (en) * | 2020-06-10 | 2021-12-10 | 华为技术有限公司 | Power supply detection device and method and computer program product thereof |
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| CN113777522A (en) * | 2020-06-10 | 2021-12-10 | 华为技术有限公司 | Power supply detection device and method and computer program product thereof |
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| 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 |
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