CN106888099A - A kind of simple compatible POE electric supply installations - Google Patents
A kind of simple compatible POE electric supply installations Download PDFInfo
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- CN106888099A CN106888099A CN201710166151.8A CN201710166151A CN106888099A CN 106888099 A CN106888099 A CN 106888099A CN 201710166151 A CN201710166151 A CN 201710166151A CN 106888099 A CN106888099 A CN 106888099A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
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Abstract
The invention discloses a kind of simple compatible POE electric supply installations, including power supply terminal circuit and receiving end circuit, it is attached by network transformer and netting twine between power supply terminal circuit and receiving end circuit；Power supply terminal circuit includes the first circuit for detecting, power supply circuit, logic circuit and the second circuit for detecting；Receiving end circuit includes rectification circuit, detecting resistance and on-off circuit.The present invention constitutes circuit using better simply discrete device, can accomplish that reliable recognition is powered without special chip, it is capable of the power supply circuit of compatibility standard PSE or PD equipment again simultaneously, so as in the case where relatively low cost is kept, while PSE the and PD equipment for meeting compatibility standard is carried out for powered requirement.With good reliability, the strong advantage of flexibility.
Description
Technical field
The present invention relates to POE（POE）Technical field, specifically a kind of simple compatible POE electric supply installations.
Background technology
POE (Power Over Ethernet) refers to not appointing in existing Ethernet Cat.5 wirings architecture
It is being some IP-based terminals in the case that what is changed（Such as IP telephone machine, wireless local network connecting point AP, web camera
Deng）While transmission data-signal, moreover it is possible to which the technology of direct current supply is provided for this kind equipment.POE is also referred to as based on LAN
Electric power system (POL, Power over LAN) or active Ethernet (Active Ethernet), be also called for short sometimes
POE, the newest standards rule of transmission data and electrical power while this is using existing standard Ethernet transmission cable
Model, and maintain the compatibility with existing Ethernet system and user.Power supply identification process disclosure satisfy that IEEE 802.3af are marked
Accurate or IEEE 802.3at standards.
Traditional POE solutions comparative maturity, a complete electric power system POE includes power supply end equipment（PSE,
Power Sourcing Equipment）With receiving end equipment（PD, Power Device）Two parts, there is special chip energy
Complete the functions such as the effective identification between PSE device and PD equipment, classification, power supply.It is ethernet client equipment that PSE device is
The equipment of power supply, while be also the manager of whole POE POEs process, and PD equipment is to receive the PSE loads of power supply.
It is used in combination using PSE chips and PD chips more than traditional POE system, PSE device exports the electricity of very little in port
Pressure, until its detect cable terminations connection be one support IEEE 802.3af standards receiving end equipment.When detecting
After receiving end equipment PD, PSE device can be classified for PD equipment, and the power attenuation needed for assessing this PD equipment.Point
The direct current of reliable and stable 48V is provided PD equipment after class is complete.But in the case where some use scene, such as privately owned is
System, host A is powered by netting twine to slave B, but only for enabling host B to be powered by standard PSE device, or main frame energy
It is enough that standard PD equipment is powered, if user is according to traditional POE power supply modes, if using expensive PSE chips and PD chips,
Cost is often much more, and form is complex.
Publication No. is CN103779972A, and publication date simply may be used for the Chinese invention patent of 2014-05-07 provides one kind
The POE device for leaning on, the basic implementation method of the patent of invention is：The feature detection resistance of receiving end equipment passes through two
To the detection circuit of ethernet line connection power supply end equipment, when the detection electric circuit inspection of power supply end equipment is to the receiving end for being connected
When the detecting resistance of equipment meets the requirements, that is, think to be connected to legitimate device, end equipment of then powering is by except connection
The two further pairs ethernet line for detecting resistance is powered to receiving end equipment.The patent simply uses resistance and is identified, into
This is relatively low, but cannot accomplish compatible other PSE or PD equipment.
The content of the invention
It is an object of the invention to provide a kind of simple compatible POE electric supply installations, it can be in the case where relatively low cost be kept, together
When meet PSE the and PD equipment of compatibility standard and carry out for powered requirement.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of simple compatible POE electric supply installations, including power supply terminal circuit and receiving end circuit, power supply terminal circuit and receiving end electricity
It is attached by network transformer and netting twine between road；
Power supply terminal circuit includes the first circuit for detecting, power supply circuit, logic circuit and the second circuit for detecting；Logic circuit includes patrolling
Collect or circuit；The input of power supply circuit is connected to power input by the current sampling resistor of the second circuit for detecting, power supply
The output end of circuit connects the sampling input of the first circuit for detecting and the centre cap input of network transformer, first respectively
The output end of the output end of circuit for detecting and the second circuit for detecting is respectively connecting to the respective input of logic or circuit, logic or
The output end of circuit connects the control end of power supply circuit；
Receiving end circuit includes rectification circuit, detecting resistance and on-off circuit；The input connection network transformer of rectification circuit
Centre cap output end, the output end of rectification circuit connects the input of the sampling input and on-off circuit of detecting resistance respectively
End, detects the control end of the sampled output connecting valve circuit of resistance；The sampling input of the first circuit for detecting passes through netting twine
Sampling input with detecting resistance is connected；The output end of on-off circuit is the output end of receiving end circuit.
The logic circuit also includes delay circuit, the delay circuit be connected to the output end of the logic or circuit with
Between the control end of the power supply circuit.
The logic or circuit use OR gate, or use two diodes in parallel in the same direction, and this two diodes
Anode is the respective input of the logic or circuit, and the negative electrode of this two diodes collectively forms the logic or circuit
Output end.
Amplifier U1 of second circuit for detecting by current sampling resistor R4 and with certain multiplication factor is constituted, and electric current is adopted
Sample resistance R4 two ends are respectively connecting to the respective input of amplifier U1, and the output end of amplifier U1 is connected to the corresponding of logic or circuit
Input.
After using such scheme, a kind of simple compatible POE electric supply installations of the invention, due to the confession that standard POE powers
Electric process is PSE end equipments by detecting the specific electrical resistance in PD equipment（It is exactly to detect resistance in the present apparatus）Meet to recognize
It is required that PD equipment, hierarchical identification is carried out to PD equipment by specific detecting voltage again after identification, if PD to the classification know
Do not respond especially（For example keep detecting resistance）So classification 0 will be considered by PSE device, can normal power supply,
In the present apparatus, PD parts utilize this characteristic, and the resistance of detecting resistance is remained in reconnaissance phase PD parts, therefore can
With the PSE device of compatibility standard, so as to be powered by standard PSE device.And the PD equipment of standard detects resistance due to there is this,
Therefore the PSE parts of the present apparatus can be by detecting the resistance such that it is able to as standard PSE device, standard PD is carried out
Power supply, so as to compatible POE standards can be realized, you can powered or be powered to standard PD equipment by standard PSE device.Meanwhile,
In the present invention, in original first circuit for detecting（Resistance detecting circuit）On the basis of increase by the second circuit for detecting（Current detecting electricity
Road）, after the first circuit for detecting detects legitimate device and successfully powers, make use of the second circuit for detecting combination logic or circuit
Function so that caused by being powered to legal power receiving equipment detect resistance failure after, power supply continued.So as in circuit
On solve existing discrete power supply technique detection cable and power cable and need separate contradiction, it is only necessary to two pairs of netting twines（A pair
Netting twine is feeder ear positive pole, and a pair of netting twines are feeder ear negative pole, while playing the function of detection and the function of power supply）Just can be real
Now detection and power supply of the power supply end equipment to receiving end equipment.The present invention constitutes circuit, nothing using better simply discrete device
Accomplish that reliable recognition is powered by needing special chip, while it is capable of the power supply circuit of compatibility standard PSE or PD equipment again, so that
In the case where relatively low cost is kept, while PSE the and PD equipment for meeting compatibility standard is carried out for powered requirement.With reliability
It is good, the strong advantage of flexibility.
Brief description of the drawings
Fig. 1 is schematic block circuit diagram of the invention；
Fig. 2 is the circuit theory diagrams of power supply terminal circuit in Fig. 1；
Fig. 3 is the circuit theory diagrams of receiving end circuit in Fig. 1.
Specific embodiment
A kind of simple compatible POE electric supply installations of the invention, as shown in Figure 1, Figure 2 and Figure 3, including power supply terminal circuit and
Receiving end circuit, is attached between power supply terminal circuit and receiving end circuit by network transformer and a pair of netting twines.
Power supply terminal circuit includes the first circuit for detecting 1, power supply circuit 2, the circuit for detecting 4 of logic circuit 3 and second；Wherein,
Logic circuit 3 includes logic or circuit 31.The current sampling resistor R4 that the input of power supply circuit 2 passes through the second circuit for detecting 4
Power input is connected to, the output end of power supply circuit 2 connects the sampling input and network transformation of the first circuit for detecting 1 respectively
The output end of the centre cap input of device, the output end of the first circuit for detecting 1 and the second circuit for detecting 4 is respectively connecting to logic
The output end of the respective input of logic or circuit 31 in circuit 3, logic or circuit 31 connects the control end of power supply circuit 2.
Receiving end circuit includes rectification circuit 5, detecting resistance 6 and on-off circuit 7；The input connection net of rectification circuit 5
The centre cap output end of network transformer, the output end of rectification circuit 5 connects the sampling input and switch of detecting resistance 6 respectively
The input of circuit 7, detects the control end of the sampled output connecting valve circuit 7 of resistance 6；The sampling of the first circuit for detecting 1
Input is connected by a pair of netting twines with the sampling input of detecting resistance 6（Another is earth-return to netting twine, and affirmative also has company
Connect each module, including the first circuit for detecting 1）；The output end VOUT of on-off circuit 7 is the output end of receiving end circuit.
Further, logic circuit 3 also includes delay circuit 32, and the delay circuit 32 is connected to the logic or circuit
Between the control end of 31 output end and the power supply circuit 2.
Power supply circuit 2 is made up of PMOS Q3, resistance R10, resistance R11, NPN triode Q4.Resistance R10 and resistance R11
Series connection, one end that resistance R10 is not connected with resistance R11 connects the S poles of PMOS Q3 respectively（Source electrode）And current sampling resistor
One end of R4, the other end connection power input POWER_IN of current sampling resistor R4, the D poles of PMOS Q3（Drain electrode）It is confession
The power output end POWER_OUT of circuit 2, and PMOS Q3 G poles（Grid）It is connected to the public affairs of resistance R10 and resistance R11
Hold altogether；The colelctor electrode of the other end connection NPN triode Q4 of the resistance R11, the emitter stage of NPN triode Q4 connects signal ground,
The base stage of NPN triode Q4 connects the output end of delay circuit 32.When the base stage input low level of NPN triode Q4, NPN tri-
Pole pipe Q4 stoppings, now series resistance R10 and R11 do not flow through electric current, resistance R10 both end voltages are 0, i.e. PMOS Q3
Grid and source electrode between voltage be 0, PMOS Q3 is remained turned-off, the not supplying power for outside of power supply circuit 2；When NPN triode Q4's
During base stage input high level, triode Q4 saturation conductions, power supply POWER_IN (ignoring sampling resistor R4) is by series resistance R10
After R11 partial pressures, certain voltage is obtained between the grid and source electrode of PMOS Q3（More than cut-in voltage）, PMOS Q3 beats
Open supply access, the supplying power for outside of power supply circuit 2.In above-mentioned, in the form of the composition of power supply circuit 2, include but are not limited to by
PMOS Q3 is constituted, and can be replaced with PMOS Q3 and be constituted with the DC-DC for enabling pin.
Second circuit for detecting 4 is made up of amplifier U1 and current sampling resistor R4, the two ends difference of current sampling resistor R4
The respective input of amplifier U1 is connected to, the output end of amplifier U1 is connected to an input of logic or circuit 31.Electric current is adopted
The voltage at sample resistance R4 two ends is V4, and amplifier U1 is the amplifier with certain multiplication factor.When power supply circuit 2 is to receiving end equipment
During power supply, sampling resistor R4 can flow through certain electric current, and produce certain voltage V4 at two ends.Voltage V4 is by amplifier U1's
Amplify, produce high level to be input in logic or circuit 31；When the electric current of sampling resistor R4 is close to 0 or equal to 0, voltage V4 passes through
After amplifier U1 amplifies, low level is produced to be input in logic or circuit 31.
First circuit for detecting 1 includes two window comparator, resistance R9, resistance R12, the resistance of amplifier U2A and U2B composition
R15, resistance R6 and resistance R8.Resistance R9, resistance R12 and resistance R15 are sequentially connected in series between power end and ground, there is provided window
The common port of the reference voltage V1 and V2 of comparator, wherein resistance R9 and resistance R12 provide V2 reference voltages, resistance R12 and
The common port of resistance R15 provides V1 reference voltages.Resistance R9 is connected to the same mutually defeated of amplifier U2A with the common port of resistance R12
Enter end, the common port of resistance R12 and resistance R15 is connected to the inverting input of amplifier U2B, the inverting input of amplifier U2A and
The in-phase input end of amplifier U2B is commonly connected to the power output end of power supply circuit 2（The drain electrode of PMOS Q3）, the window compares
The output end of device is connected to another input of logic or circuit 31.The inverting input of amplifier U2A and the same phase of amplifier U2B
Input is the sampling input of the window comparator, and the sampling input terminal voltage is V3, works as V1<V3<During V2, comparator
U2A and U2B outputs are high level, work as V3>V2 or V3<When V1, amplifier U2A and U2B one of them be output as low electricity
Flat, another is high level.Because two amplifiers are all open-drain outputs, output is by common pull-up resistor R8 short circuits one
Rise, constitute the logical relation with door, therefore work as V3>V2 or V3<During V1, another amplifier of amplifier output high level is defeated
Go out low level, by with logical relation, window comparator can export low level, work as V1<V3<During V2, two amplifiers are exported
High level, window comparator can export high level.The resistance R1 and resistance R2 is the detecting resistance 6 in receiving end circuit, is supplied
Electric terminal circuit is connected by a pair of netting twines with the detecting resistance 6 of receiving end circuit（Another is earth-return to netting twine）, resistance R1 with
Resistance R2 is in series, and the other end of resistance R1 connects the sampling input of window comparator, the other end ground connection of resistance R2.Power supply
Terminal circuit detects the due resistance of resistance 6 in setting receiving end circuit by resistance R9, resistance R12, resistance R15 and resistance R6
Value scope, only when the resistance of the detecting resistance 6 falls in due scope, can just be powered terminal circuit be identified as it is legal by electricity
End equipment.In Fig. 2, VCC is connected by resistance R6 with resistance R1, resistance R2, and V3 is obtained in the common port of resistance R6 and resistance R1
Voltage.When the resistance of resistance 6 is detected in set scope, the V3 voltages for obtaining meet V1<V3<V2；When detecting resistance 6
Resistance not in set scope, the V3 voltages V3 for obtaining>V2 or V3<V1.When feeder ear electric circuit inspection to legitimate device
When, described window comparator exports high level to logic or circuit 31.When power supply end equipment can't detect legal receiving end
During equipment, window comparator exports low level to logic or circuit 31.
In logic circuit 3, logic or circuit 31 can use OR gate, it would however also be possible to employ two diodes in parallel come in the same direction
Complete the function of logic sum gate.When using two diodes, the anode of this two diodes is the phase of logic or circuit 31
Input is answered, the negative electrode of this two diodes collectively forms the output end of logic or circuit 31.Delay circuit 32, or perhaps letter
Easy monostable flipflop circuit, can be made up of simple RC components, or can realize the circuit of monostable trigger function, should
Circuit can enable logic or effective high level of the output of circuit 31 be kept for a period of time, it is ensured that the first circuit for detecting 1 and the
The linking stabilization function of two circuit for detecting 4.When logic or circuit 31 have an input（Input A or input B）It is height
Level, then the output end F of logic or circuit 31 is high level, and delay circuit also exports high level, so that NPN triode Q4
Saturation conduction, PMOS Q3 opens supplying channels, i.e. feeder ear and is powered to receiving end equipment；When logic or the input of circuit 31
（Input A or input B）When being for low level, logic or circuit 31 are output as low level, so that NPN triode Q4
Stopping, PMOS Q3 closes supplying channels, and power supply end equipment is not powered to receiving end equipment.
Rectification circuit 5 is using the rectifier bridge D4 being made up of four diodes, it is ensured that either PSE1 is just with respect to PSE2
Voltage or negative voltage, by after rectifier bridge D4, the 2nd pin of rectifier bridge D4 can be positive voltage with respect to the 4th pin.Reason is
The netting twine of connection power supply end equipment and receiving end equipment there may exist crossover network cables, therefore rectifier bridge D4 ensure that and either mark
Accurate PSE device or the power supply end equipment of oneself, can be that receiving end equipment is powered with correct polarity.If privately owned
System, the power supply polarity and netting twine for having determination, can not use rectification circuit 5.
Detecting resistance 6 is in series by resistance R1 and resistance R2, and the common port of resistance R1 and resistance R2 is connected to switch
The control end of circuit 7, the 2nd pin of the other end connection rectifier bridge D4 of resistance R1, the other end connection rectifier bridge D4 of resistance R2
The 4th pin.Resistance R16 and resistance R17 is connected with certain ratio so that when terminal circuit of powering is not powered, VCC voltages warp
Resistance R6 is crossed, resistance R1, the partial pressure of resistance R2, the voltage at resistance R1 two ends cannot meet the condition for opening on-off circuit 7, from
And receiving end design impedance is kept the series value of resistance R1 and resistance R2；And when terminal circuit of powering is powered, input power
POWER_IN enters receiving end circuit by power supply circuit 2, by the partial pressure of the resistance R1 and resistance R2 of receiving end circuit, can
So that R1 both end voltages meet the condition of the opening of on-off circuit 7, so that successfully for receiving end equipment application circuit is powered.
On-off circuit 7 is made up of PMOS Q5, the 2nd pin of the source electrode connection rectifier bridge D4 of PMOS Q5, PMOS Q5
Drain electrode be on-off circuit 7 output end（It is load supplying）, the grid of PMOS Q5（The control end of on-off circuit 7）Connection
The common port of resistance R1 and resistance R2.When resistance R1 both end voltages meet certain value, it is load electricity that PMOS Q5 can be opened
Road powers so that after sampling resistor R4 flows through a certain amount of electric current in power supply terminal circuit, the output high level of the second circuit for detecting 4.
The form of on-off circuit 7 is not limited only to the form of PMOS Q5, for example, the EN of DC-DC power source chip can also be utilized to enable pin and be connected on
The common port of R1 and R2.Following purpose can be realized：When first circuit for detecting 1 works, under VCC voltages, by resistance
After the series connection partial pressure of R6, resistance R1, resistance R2, receiving end circuit keeps not powering to the load.Only in power input
The voltage of POWER_IN, by resistance R1 and resistance R2 partial pressures, can make receiving end after power supply circuit 2 accesses receiving end
Circuit is opened and powered to the load.
Operation principle of the invention is as follows：
Before not accessing receiving end equipment, because power supply circuit 2 is opened a way, the electric current for flowing through current sampling resistor R4 is unsatisfactory for setting
Value, therefore the second circuit for detecting 4 exports low level to logic or circuit 31；The now output end POWER_OUT of power supply circuit 2
Impedance is infinity, is unsatisfactory for due value range, therefore the first circuit for detecting 1 exports low level to logic or circuit 31.This
When logic or the input A and input B of circuit 31 be low level, therefore logic or circuit 3 are output as low level,
NPN triode Q4 stoppings, PMOS Q3 is set to close supplying channels.Before i.e. non-access device, the first circuit for detecting 1 and second
The output of circuit for detecting 4 is low level, logic or the output low level of circuit 3.NPN triode Q4 keeps stopping, PMOS
Q3 remains turned-off supplying channels.
After accessing illegal receiving end equipment, that is, detect the scope that resistance 6 is unsatisfactory for requiring.Because of detecing for illegal receiving end equipment
Measuring resistance 6 is unsatisfactory for desired scope, therefore the first circuit for detecting 1 continues to keep low level output.And PMOS Q3 is being accessed
Before power receiving equipment and after access power receiving equipment, never opened, so the second circuit for detecting 4 also continues to keep low level defeated
Go out, therefore logic or circuit 31 continue to output low level, NPN triode Q4 keeps stopping, PMOS Q3 to remain turned-off confession
Electric channel, i.e. illegality equipment cannot be powered all the time.
After accessing legal receiving end equipment, that is, detect resistance 6 and meet required scope.Because the legitimate device for accessing is detectd
In the range of requiring, the first circuit for detecting 1 exports high level to measuring resistance 6.One end input of logic or circuit 31 is high level,
Therefore its output also be high level so that NPN triode Q4 saturation conductions, PMOS Q3 open supplying channels, i.e. feeder ear to
Receiving end equipment is powered.While power supply, the V3 voltages become supply voltage, and V3 is unsatisfactory for V1<V3<V2, therefore first detect
Slowdown monitoring circuit 1 exports low level, but the PMOS Q3 for having opened is so that receiving end circuit is met the voltage of requirement and opens
On-off circuit 7, current sampling resistor R4 flows through certain electric current, and the second circuit for detecting 4 exports high level to logic or circuit 31,
So that in the case of the first circuit for detecting is low level, due to the high level of the second circuit for detecting output, logic or circuit 31 are protected
Hold high level output so that NPN triode Q4 still saturation conductions, PMOS Q3 stay open supplying channels, i.e. feeder ear to
Legal receiving end equipment continued power.First circuit for detecting 1 and the second circuit for detecting 4 when high level is switched, in order to keep supplying
The stabilization of electricity, adds delay circuit 32 in logic circuit 3（Simple single-shot trigger circuit）.Even if delay circuit 32 is caused
After the output high level of first circuit for detecting 1 becomes low level, logic circuit 3 can keep the regular hour to export high level, should
Time is enough to make the second circuit for detecting 4 export the high level of stabilization, so as to realize that logic circuit 3 is defeated when legitimate device is inserted
Go out the high level of stabilization, power supply circuit keeps the power supply of stabilization to legal power receiving equipment.
Claims (4)
1. a kind of simple compatible POE electric supply installations, including power supply terminal circuit and receiving end circuit, power terminal circuit and receiving end
It is attached by network transformer and netting twine between circuit；It is characterized in that：
Power supply terminal circuit includes the first circuit for detecting, power supply circuit, logic circuit and the second circuit for detecting；Logic circuit includes patrolling
Collect or circuit；The input of power supply circuit is connected to power input by the current sampling resistor of the second circuit for detecting, power supply
The output end of circuit connects the sampling input of the first circuit for detecting and the centre cap input of network transformer, first respectively
The output end of the output end of circuit for detecting and the second circuit for detecting is respectively connecting to the respective input of logic or circuit, logic or
The output end of circuit connects the control end of power supply circuit；
Receiving end circuit includes rectification circuit, detecting resistance and on-off circuit；The input connection network transformer of rectification circuit
Centre cap output end, the output end of rectification circuit connects the input of the sampling input and on-off circuit of detecting resistance respectively
End, secondly output end is negative pole, detects the control end of the sampled output connecting valve circuit of resistance；First circuit for detecting
Sampling input is connected by netting twine with the sampling input of detecting resistance；The output end of on-off circuit is receiving end circuit
Output end.
2. a kind of simple compatible POE electric supply installations according to claim 1, it is characterised in that：The logic circuit is also
Including delay circuit, the delay circuit be connected to the output end of the logic or circuit and the power supply circuit control end it
Between.
3. a kind of simple compatible POE electric supply installations according to claim 1, it is characterised in that：The logic or circuit
Using OR gate, or using two diodes in parallel in the same direction, and the anode of this two diodes is the logic or circuit
Respective input, the negative electrode of this two diodes collectively forms the output end of the logic or circuit.
4. a kind of simple compatible POE electric supply installations according to claim 1, it is characterised in that：The second detecting electricity
The routing current sampling resistor R4 and amplifier U1 with certain multiplication factor is constituted, and current sampling resistor R4 two ends are respectively connecting to
The respective input of amplifier U1, the output end of amplifier U1 is connected to the respective input of logic or circuit.
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| CN201710166151.8A CN106888099A (en) | 2017-03-20 | 2017-03-20 | A kind of simple compatible POE electric supply installations |
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| CN201710166151.8A CN106888099A (en) | 2017-03-20 | 2017-03-20 | A kind of simple compatible POE electric supply installations |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107271876A (en) * | 2017-07-27 | 2017-10-20 | 深圳市和为顺网络技术有限公司 | PD detects circuit |
| CN107317686A (en) * | 2017-06-26 | 2017-11-03 | 浙江大华技术股份有限公司 | A kind of power supply unit PSE |
| CN108521334A (en) * | 2018-03-30 | 2018-09-11 | 深圳市云谷创新科技有限公司 | A kind of POE power supply systems |
| CN111092445A (en) * | 2018-10-24 | 2020-05-01 | 华为技术有限公司 | Signal reliability detection method, PSE chip, CPU chip and PoE device |
| CN112526318A (en) * | 2020-11-24 | 2021-03-19 | 锐捷网络股份有限公司 | Ethernet power supply circuit detection method and device |
| CN112688788A (en) * | 2020-12-16 | 2021-04-20 | 普联国际有限公司 | Discrete PD circuit and power supply system |
| CN113555865A (en) * | 2020-04-24 | 2021-10-26 | 瑞昱半导体股份有限公司 | Power supply equipment and connection checking method |
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| CN111092445A (en) * | 2018-10-24 | 2020-05-01 | 华为技术有限公司 | Signal reliability detection method, PSE chip, CPU chip and PoE device |
| CN111092445B (en) * | 2018-10-24 | 2021-10-26 | 华为技术有限公司 | Signal reliability detection method, PSE chip, CPU chip and PoE device |
| CN113555865A (en) * | 2020-04-24 | 2021-10-26 | 瑞昱半导体股份有限公司 | Power supply equipment and connection checking method |
| CN112526318A (en) * | 2020-11-24 | 2021-03-19 | 锐捷网络股份有限公司 | Ethernet power supply circuit detection method and device |
| CN112688788A (en) * | 2020-12-16 | 2021-04-20 | 普联国际有限公司 | Discrete PD circuit and power supply system |
| CN112688788B (en) * | 2020-12-16 | 2022-11-08 | 普联国际有限公司 | Discrete PD circuit and power supply system |
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Application publication date: 20170623 |