CN103490906B - Power supply processing method and device and power supply system - Google Patents
Power supply processing method and device and power supply system Download PDFInfo
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- CN103490906B CN103490906B CN201310388432.XA CN201310388432A CN103490906B CN 103490906 B CN103490906 B CN 103490906B CN 201310388432 A CN201310388432 A CN 201310388432A CN 103490906 B CN103490906 B CN 103490906B
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Abstract
The invention provides a power supply processing method and device and a power supply system. The method comprises the steps that if the fact that a cable inserted in a port can be used for normal communication and power supply is determined, whether a terminal of the cable is connected with a load is determined; if the terminal of the cable is connected with the load, a PSE chip is started, and accordingly the PSE chip carries out detecting and power supply on the load.
Description
Technical field
The present invention relates to electronic technology, more particularly to a kind of power supply treating method and apparatus and electric power system.
Background technology
In the prior art, POE（Power over Ethernet；Referred to as：PoE）System mainly includes：Power supply
End equipment（Power Source Equipment；Referred to as：PSE）With receiving end equipment（Powered Device；Referred to as：PD）.
Wherein, PoE refer to existing Ethernet cable connect up architecture in the case where any change is not used as it is ensured that
It is PD, such as wideband telephony（Voice over Internet Protocol；Referred to as：VoIP）, wireless local network connecting point
（Access Point；Referred to as：AP）, web camera and while some other IP-based terminal transmission data signal,
Power supply capacity can also be provided for this kind equipment.
In addition, the powered operation process of the PoE system can be as follows：1st, detection process, i.e. PSE are to export very in port
Small voltage, until its terminal for detecting its cable is connected to a PD；2nd, PD device classes, i.e., after PD is detected,
PSE may be classified for PD, and the power attenuation needed for assessing this PD；3rd, start power supply, i.e., it is configurable at one
Time（Generally less than 15 microseconds）Starting period in, PSE starts to be powered to PD since low-voltage, until provide to 44 volts（V）
To 57V grades of dc source；4th, power, as PD provides the dc source of reliable and stable 44V to 57V grades；5th, power off, even
PD is removed from network, and PSE will be rapidly（Typically within the time of 300-400ms）Stop being powered for PD, and again
Start to detect whether the terminal of cable connects PD.
But, when the terminal of cable is not connected to PD, PSE can still continue to detect, so as to cause the waste of PSE power consumptions.
The content of the invention
The present invention provides a kind of power supply treating method and apparatus and electric power system, the power consumption for effectively reducing PSE.
The first aspect of the invention is to provide a kind of power supply processing method, including：
If it is determined that the cable of port insertion being capable of normal communication and power supply, it is determined that whether the terminal of the cable is connected with
Load；
If it is determined that the terminal of the cable is connected with load, then start PSE chips, so that the PSE chips are to described negative
It is loaded into row detection and powers.
Another aspect of the present invention is to provide a kind of power supply processing unit, including：
Determining module, for if it is determined that the cable of port insertion being capable of normal communication and power supply, it is determined that the cable
Whether terminal is connected with load；
Trigger module, if determining that the terminal of the cable is connected with load for the determining module, starts PSE cores
Piece, so that the PSE chips are detected and powered to the load.
An additional aspect of the present invention is to provide a kind of electric power system, including：Power supply processing unit as described above,
PSE chips and PHY chip
The solution have the advantages that：If it is determined that the cable of port insertion being capable of normal communication and power supply, it is determined that the line
Whether the terminal of cable is connected with load, however, it is determined that the terminal of the cable is connected with load, then start PSE chips, so that the PSE cores
Piece detected and powered to the load, due to it is determined that the cable of port insertion being capable of normal communication and power supply, and cable
When terminal is connected with load, just opens PSE chips and the load is powered, therefore, compared to real-time opposite end in the prior art
For the cable of mouth insertion is detected, the power consumption of PSE has effectively been saved.
Brief description of the drawings
Fig. 1 is the configuration diagram of the PoE system that present invention power supply processing method is based on；
Fig. 2 is the flow chart of one embodiment of present invention power supply processing method；
Fig. 3 is the flow chart of another embodiment of present invention power supply processing method；
Fig. 4 is the flow chart of another embodiment of present invention power supply processing method；
Fig. 5 is the structural representation of one embodiment of present invention power supply processing unit；
Fig. 6 is the structural representation of another embodiment of present invention power supply processing unit.
Specific embodiment
Fig. 1 is the configuration diagram of the PoE system that present invention power supply processing method is based on, as shown in figure 1, the PoE bags
Include：CPU（Central Processing Unit；Referred to as：CPU）11st, PSE chips 12, medium access control
（Media Access Control；Referred to as：MAC）Chip 13, physical layer（physical layer；Referred to as：PHY）Chip 14,
Isolating transformer 15 and RJ4516.Wherein, CPU11 is administrative section core, operation driver and network operating system.PSE
Chip 12 is the power supply module of PoE system, and it is responsible for detecting presence of PD, and PD to detecting is powered, and
Carry out voltage/current detection in power supply process, and cut-out function detection etc..MAC chips 13 are used to realize Ethernet protocol
Treatment, message forwarding etc..PHY chip 14 is Ethernet physical medium（Such as netting twine）The bridge of data interaction between MAC chips 13
Beam.Isolating transformer 15 is used for the electrical isolation to PHY14 and ethernet line.RJ4516 is used to connect unshielded twisted pair,
I.e. conventionally used netting twine（Cable can also be referred to as）.
In addition, the ethernet port of various different rates coexists, for example：10M, 100M, 1G and 10G etc..Typically
Situation, ethernet port is connected by the realization of RJ4516 and external equipment, wherein, RJ4516 totally 8 pins；1/2 pin, 3/6
Pin, 4/5 pin and 7/8 pin constitute 4 pairs of differential signal groups, and tetra- groups of differential signals of A, B, C and D, every group of letter are designated as respectively
On two pins above number, the signal opposite each other of transmission.For example, 10M/100M only needs to use the 2 of 4 centerings
It is right, i.e. two groups of signals of A/B.The signal of 1G/10G is connected, it is necessary to use 4 groups of signals.And PoE is when powering, then in a signal group
Two holding wires on transmit same level signal, for example：As two holding wire simultaneous transmissions are power supply letter in A group signal groups
Number, two holding wire simultaneous transmission power supply earth signals in group-b signal group；Or, C groups holding wire is power supply signal, D group holding wires
It is power supply earth signal.
Fig. 2 is the flow chart of one embodiment of present invention power supply processing method, in PoE system framework shown in above-mentioned Fig. 1
On the basis of, as shown in Fig. 2 the method for the present embodiment includes：
Step 101, if it is determined that the cable of port insertion being capable of normal communication and power supply, it is determined that whether the terminal of the cable
It is connected with load.
In the present embodiment, after PoE system start, the PSE detections to port are first closed, and the related PHY in port is received
Hair function, then to insert cable detect, that is, determine port insertion cable whether can normal communication and power supply, and
It is determined that port insertion cable can normal communication and power supply when, determine whether the terminal of the cable is connected with load.Wherein,
The port can be RJ45.
Step 102, if it is determined that the terminal of the cable is connected with load, then start PSE chips, so that the PSE chips are to this
Load is detected and powered.
In the present embodiment, however, it is determined that the cable of port insertion being capable of normal communication and power supply, it is determined that the end of the cable
Whether end is connected with load, however, it is determined that the terminal of the cable is connected with load, then start PSE chips, so that the PSE chips are to this
Load detected and powered, due to it is determined that port insertion cable can normal communication and power supply, and cable terminal connect
When being connected to load, just open PSE chips and the load is powered, therefore, compared in the prior art in real time to port insertion
Cable detected for, effectively saved the power consumption of PSE.
Fig. 3 is the flow chart of another embodiment of present invention power supply processing method, in the base of above-mentioned embodiment illustrated in fig. 2
On plinth, as shown in figure 3, determining whether the terminal of the cable connects a kind of loaded specific implementation and be in step 101：
Step 101a, if it is determined that port insertion cable can normal communication and power supply, then trigger PHY chip so that should
Whether PHY chip is lowpass response between detecting the data wire pair of the cable.
Alternatively, a kind of specific implementation of step 102 is：
If step 102a, the PHY chip are lowpass response between detecting the data wire pair of the cable, start PSE cores
Piece, so that the PSE chips are detected and powered to the load.
In the present embodiment, specifically, whether being lowpass response between detecting the signal group of the cable, i.e., in A group holding wires
On detected, if can receive a high-frequency cut-off on group-b signal line, the response signal that low frequency passes through then illustrates the line
It is lowpass response between the signal group of cable.
Alternatively, in addition it is also necessary to explanation, if not being low pass sound between the PHY chip detects the data wire pair of the cable
Should, it is determined that the terminal of the cable does not connect load.
It should be noted that another specific implementation of step 101a can be：
If it is determined that port insertion cable can normal communication and power supply, then trigger PHY chip so that the PHY chip examine
Whether survey between the extra pair of the cable is lowpass response.
Another specific implementation of step 102a is：
If the PHY chip is lowpass response between detecting the extra pair of the cable, start PSE chips, so that should
PSE chips are detected and powered to the load.
If not being lowpass response between then the PHY chip detects the extra pair of the cable, it is determined that the end of the cable
End loads without connection.
In the present embodiment, by taking data wire pair as an example, if the terminal of cable is connected with load, because it is between data wire pair
Load has been mounted, therefore, the cable characteristic between data wire pair can show as a form for low pass filter, i.e., enterprising in A groups
The detection of line cable, then can receive the response signal that high-frequency cut-off, a low frequency pass through on group-b signal.If in addition, cable
Terminal does not connect load, due to its between data wire pair without mounting load, therefore, be between data wire pair it is separate,
That is the enterprising line cable detection of A groups, the signal for arriving received in other signal groups is extremely faint.
In the present embodiment, in addition it is also necessary to explanation, when PoE powers, if two holding wire simultaneous transmissions in A group signal groups
It is power supply signal, two holding wire simultaneous transmission power supply earth signals, then trigger PHY chip in group-b signal group, so that the PHY cores
Whether piece is lowpass response between detecting the data wire pair of the cable；If C groups holding wire is power supply signal, D groups holding wire is electricity
Whether source earth signal, then trigger PHY chip, so as to be lowpass response between the PHY chip detects the extra pair of the cable.Its
In, to referring to above-mentioned A groups and B groups, extra pair refers to above-mentioned C group and D groups to data wire.
Alternatively, before step 101a, the method can also include：
Step 100, start PHY chip so that the PHY chip to the cable whether can normal communication detect, if
Detect the cable can normal communication, then to the cable whether can normal power supply detect.
Specifically, may determine that whether port has cable to insert first, if port does not have cable to insert, constantly detection is
It is no to there is cable to insert；If port has cable to insert, detect insertion cable whether normal communication, that is, detect at least two groups of A/B
Whether holding wire being capable of normal work.If two groups of holding wires of A/B are problematic（For example：There is open/short in two groups of holding wires of A/B
Situations such as）, then open the PHY transmission-receiving functions of PSE detections and port without in all senses, then first closed after PoE system start
PSE is detected and the PHY transmission-receiving functions of port can effectively energy saving.If two groups of holding wires of A/B have no problem, detection is inserted
The cable for entering whether normal power supply, if being powered using two groups of holding wires of A/B, need not again detect that whether the cable of insertion can
Normal power supply；If being powered using two groups of holding wires of C/D, need to detect whether two groups of holding wires of C/D being capable of normal works（Example
Such as：Situations such as two groups of holding wires of C/D whether there is open/short）If, detect two groups of holding wires of C/D can normal work,
Illustrate that the cable of port insertion can be with normal communication and power supply.
Fig. 4 is the flow chart of another embodiment of present invention power supply processing method, in PoE system frame shown in above-mentioned Fig. 1
On the basis of structure, as shown in figure 4, the method for the present embodiment includes：
Step 201, close PSE chips, and port PHY transmission-receiving functions.
In the present embodiment, supported for one power supply for external port, the function of port include supplying power for outside with
And data transmit-receive（That is PHY is received and dispatched）Etc. function.Wherein supplying power for outside function is completed by PSE chips, and the function of data transmit-receive needs
Completed by PHY chip and MAC chips.Wherein, MAC chips Main Function is data exchange, and PHY chip Main Function is end
Mouth connection（link）The maintenance of state, and the Media Independent Interface that extraneous physical signalling is converted into being interconnected with MAC, so that
Realize the communication with MAC.
Step 202, startup PHY chip, so that the PHY chip detects whether the port has cable to insert；If there is cable to insert
Enter, then perform step 203；If without cable insertion, continuing executing with step 202.
Step 203, triggering PHY chip to the cable whether can normal communication detect；If detecting the cable energy
Enough normal communications, then perform step 204；Can not normal communication, execution step 202 if detecting the cable.
Step 204, triggering PHY chip to the cable whether can normal power supply detect, if detecting the cable energy
Enough normal power supplies, then perform step 205；Can not normal power supply, execution step 208 if detecting the cable.
Step 205, triggering PHY chip, so as to whether be that low pass is rung between the PHY chip detects the data wire pair of the cable
Should, if being lowpass response between detecting the data wire pair of the cable, perform step 206；If between detecting data wire pair
It is not lowpass response, then performs step 209.
In the present embodiment, in addition it is also necessary to explanation, another specific implementation of step 205 is：
Triggering PHY chip, so as to whether be lowpass response between the PHY chip detects the extra pair of the cable, if inspection
It is lowpass response to measure between the extra pair of the cable, then perform step 206；If between detecting extra pair not being low pass
Response, then perform step 209.
In the present embodiment, when PoE powers, if two holding wire simultaneous transmissions are power supply signal, B groups in A group signal groups
Two holding wire simultaneous transmission power supply earth signals, then trigger PHY chip in signal group, so that the PHY chip detects the cable
Whether it is lowpass response between data wire pair；If C groups holding wire is power supply signal, D groups holding wire is power supply earth signal, then trigger
PHY chip, so as to whether be lowpass response between the PHY chip detects the extra pair of the cable.
Step 206, startup PSE chips, so that the PSE chips are detected and powered to the load.
Step 207, the triggering PSE chips detect the PSE chips to the load supplying after the first Preset Time
It is whether normal, if power supply is abnormal, perform step 208；If power supply is normal, step 209 is performed.
Step 208, stopping are powered to the load.
In the present embodiment, when the terminal of cable is connected with load, can by the PSE chip detections loads whether be
PD, that is, attempt carrying out electricity.Due to it is upper electricity need a process, about 2 to 3 seconds, therefore, wait 3 seconds（I.e. above-mentioned first is pre-
If the time）Afterwards, it can be determined that whether the power supply is normal, if power supply is normal, illustrates that the load is a PD.If power supply is not just
Often, then illustrate that the load is not a PD, or a PD for failure, then close PSE chips, that is, stop carrying out the load
Power supply, to save power consumption.
Step 209, stopping detect to the cable, and opens the PHY transmission-receiving functions of the port so that the port with should
Connection is set up in load.
Step 210, after the second Preset Time, judge whether to be established between the port and the load normal connection；
If judging, normal connection is set up in the port and the load, performs step 211；If judging, the port and the load are not built
Attention and often connect, then perform step 212.
Step 211, every the 3rd Preset Time, judge whether to be established between the port and the load normal connection.If
Judge that normal connection is set up in the port and the load, then continue executing with step 211；If judging, the port and the load do not have
Normal connection is set up, then performs step 212.
Step 212, the PHY transmission-receiving functions of the port are closed, and perform step 201.
In the present embodiment, connect（link）Treatment needs the regular hour, about 5 seconds.Therefore, about 5 to 10 are waited
Second（The second i.e. above-mentioned Preset Time）Afterwards, judge the link states of the port, that is, judge between the port and the load whether
Normal connection is established, if establishing normal connection between the port and the load, illustrates that PSE chip power supplies are normal, then only
Need to be spaced a bit of time（About 5 seconds, i.e., the 3rd Preset Time described above）, judge between the port and the load
Whether normal connection is established.If illustrating that load is removed without normal connection is set up between the port and the load,
Or PSE chip power supplies etc. are not at normal state, then return to step 201 is needed, re-start above-mentioned circulation.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above-mentioned each method embodiment can lead to
The related hardware of programmed instruction is crossed to complete.Foregoing program can be stored in a computer read/write memory medium.The journey
Sequence upon execution, performs the step of including above-mentioned each method embodiment；And foregoing storage medium includes：ROM, RAM, magnetic disc or
Person's CD etc. is various can be with the medium of store program codes.
Fig. 5 is the structural representation of one embodiment of present invention power supply processing unit, as shown in figure 5, the present embodiment
Device includes：Determining module 21 and trigger module 22；Wherein it is determined that module 21 is used for if it is determined that the cable of port insertion can be just
Normal open is interrogated and powered, it is determined that whether the terminal of the cable is connected with load；If it is true that trigger module 22 is used for the determining module 21
The terminal of the fixed cable is connected with load, then start PSE chips, so that the PSE chips are detected and powered to the load.
The power supply processing unit of the present embodiment can perform the technical scheme of embodiment of the method shown in Fig. 2, its realization principle
Similar, here is omitted.
In the present embodiment, however, it is determined that the cable of port insertion being capable of normal communication and power supply, it is determined that the end of the cable
Whether end is connected with load, however, it is determined that the terminal of the cable is connected with load, then start PSE chips, so that the PSE chips are to this
Load detected and powered, due to it is determined that port insertion cable can normal communication and power supply, and cable terminal connect
When being connected to load, just open PSE chips and the load is powered, therefore, compared in the prior art in real time to port insertion
Cable detected for, effectively saved the power consumption of PSE.
Further, in another embodiment of the present invention, on the basis of above-mentioned embodiment illustrated in fig. 5, the triggering
Module 22 is additionally operable to trigger PHY chip so that the PHY chip detect between the data wire pair or extra pair of the cable whether
It is lowpass response；
If the determining module 21 is lowpass response between the data wire pair of the cable is detected specifically for the PHY chip,
Then determine that the terminal of the cable is connected with load；If the determining module 21 is additionally operable to the data that the PHY chip detects the cable
It is not lowpass response between line pair, it is determined that the terminal of the cable does not connect load；
Or,
If the determining module 21 is lowpass response between the extra pair of the cable is detected specifically for the PHY chip,
Then determine that the terminal of the cable is connected with load；If the determining module 21 is additionally operable to the PHY chip and detects the standby of the cable
It is not lowpass response between line pair, it is determined that the terminal of the cable does not connect load.
Alternatively, the trigger module 22 is additionally operable to start PHY chip, so that whether the PHY chip can be just to the cable
Normal open news detected, if detect the cable can normal communication, to the cable whether can normal power supply examine
Survey.
Fig. 6 is the structural representation of another embodiment of present invention power supply processing unit, real shown in above-mentioned each device
On the basis of applying example, as shown in fig. 6, trigger module 22 is additionally operable to be low between the PHY chip detects the signal group of the cable
Logical response or detect the cable can not normal power supply when, or after stopping being powered the load, open the port
PHY transmission-receiving functions, so as to the port and the load are set up be connected；
Then the device also includes：Judge module 23 and closedown module 24；Wherein, judge module 23 is used for when second is default
Between after, judge whether connection is established between the port and the load；If closedown module 24 judges for the judge module 23
Go out the port and connection is not set up in the load, then close the PHY transmission-receiving functions of the port；Trigger module 22 is additionally operable to touch again
Send out the PHY chip and detect whether the cable of port insertion being capable of normal communication and power supply.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
Pipe has been described in detail with reference to foregoing embodiments to the present invention, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (8)
1. a kind of power supply processing method, it is characterised in that including：
Close PSE chips, and port PHY transmission-receiving functions；
Start PHY chip so that the cable that insert to port of the PHY chip whether can normal communication detect, if examining
Measure the cable can normal communication, then to the cable whether can normal power supply detect；
If it is determined that the cable of port insertion being capable of normal communication and power supply, it is determined that it is negative whether the terminal of the cable is connected with
Carry；
If it is determined that the terminal of the cable is connected with load, then start PSE chips so that the PSE chips to it is described load into
Row detection and power supply.
2. power supply processing method according to claim 1, it is characterised in that whether the terminal of the determination cable connects
Load is connected to, including：
Triggering PHY chip, so that the PHY chip detects whether between the data wire pair or extra pair of the cable be low
Logical response；
If the PHY chip is lowpass response between detecting the data wire pair of the cable, it is determined that the terminal of the cable
It is connected with load；If the PHY chip is not lowpass response between detecting the data wire pair of the cable, it is determined that the line
The terminal of cable does not connect load；
Or,
If the PHY chip is lowpass response between detecting the extra pair of the cable, it is determined that the terminal of the cable
It is connected with load；If the PHY chip is not lowpass response between detecting the extra pair of the cable, it is determined that the line
The terminal of cable does not connect load.
3. power supply processing method according to claim 1, it is characterised in that the startup PSE chips, so that the PSE
After chip is detected and powered to the load, methods described also includes：
If the PSE chips are after the first Preset Time, it is abnormal to the load supplying to detect the PSE chips, then
Stop being powered the load.
4. power supply processing method according to claim 2, it is characterised in that also include：
Between the PHY chip detects the data wire pair of the cable for lowpass response or detect the cable can not
During normal power supply, or after stopping being powered the load, the PHY transmission-receiving functions of the port are opened, so that described
Port is set up with the load and is connected；
After the second Preset Time, judge whether connection is established between the port and the load, if judging described
Connection is not set up in port and the load, then close the PHY transmission-receiving functions of the port, and PHY chip described in retriggered
Detect whether the cable of the port insertion being capable of normal communication and power supply.
5. a kind of power supply processing unit, it is characterised in that including：
Closedown module, for closing PSE chips, and port PHY transmission-receiving functions；
Trigger module, for starting PHY chip, so that whether the cable that the PHY chip is inserted to port being capable of normal communication
Detected, if detect the cable can normal communication, to the cable whether can normal power supply detect；
Determining module, for if it is determined that the cable of port insertion being capable of normal communication and power supply, it is determined that the terminal of the cable
Whether load is connected with；
Trigger module, if being additionally operable to the determining module determines that the terminal of the cable is connected with load, starts PSE chips,
So that the PSE chips are detected and powered to the load.
6. power supply processing unit according to claim 5, it is characterised in that the trigger module is additionally operable to trigger PHY cores
Piece, so that the PHY chip detects whether between the data wire pair or extra pair of the cable be lowpass response；
If the determining module is lowpass response between the data wire pair of the cable is detected specifically for the PHY chip,
Then determine that the terminal of the cable is connected with load；If the determining module is additionally operable to the PHY chip and detects the cable
Data wire pair between be lowpass response, it is determined that the terminal of the cable does not connect load；
Or,
If the determining module is lowpass response between the extra pair of the cable is detected specifically for the PHY chip,
Then determine that the terminal of the cable is connected with load；If the determining module is additionally operable to the PHY chip and detects the cable
Extra pair between be lowpass response, it is determined that the terminal of the cable does not connect load.
7. power supply processing unit according to claim 6, it is characterised in that the trigger module is additionally operable in the PHY
Chip detection to the cable data wire to for lowpass response or detect the cable can not normal power supply when, or stopping
After being only powered to the load, the PHY transmission-receiving functions of the port are opened, so that the port is set up with the load
Connection；
Then described device also includes：
Judge module, for after the second Preset Time, judging whether connection is established between the port and the load；
The closedown module, if being additionally operable to the judge module judges that connection is not set up in the port and the load,
Close the PHY transmission-receiving functions of the port；
The PHY chip described in retriggered of the trigger module being additionally operable to detects whether the cable of the port insertion being capable of just normal open
News and power supply.
8. a kind of electric power system, it is characterised in that including：Power supply processing unit, PSE cores as described in claim 5 to 7 is any
Piece and PHY chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310388432.XA CN103490906B (en) | 2013-08-30 | 2013-08-30 | Power supply processing method and device and power supply system |
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|---|---|---|---|
| CN201310388432.XA CN103490906B (en) | 2013-08-30 | 2013-08-30 | Power supply processing method and device and power supply system |
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| CN103490906A CN103490906A (en) | 2014-01-01 |
| CN103490906B true CN103490906B (en) | 2017-05-24 |
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| CN207010698U (en) * | 2017-06-15 | 2018-02-13 | 东莞市优力普物联科技有限公司 | A kind of super low energy consumption PoE chargers |
| US10868680B2 (en) * | 2017-08-25 | 2020-12-15 | Analog Devices International Unlimited Company | Power over ethernet using shielded single twisted wire pair |
| CN109428727B (en) * | 2017-08-28 | 2020-06-26 | 华为技术有限公司 | Power supply equipment and energy-saving method for power over Ethernet |
| CN107612854A (en) * | 2017-10-18 | 2018-01-19 | 湖南恒茂高科股份有限公司 | A kind of non-management type PoE interchangers and control method |
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