CN108418444A - A kind of POE bidirectional power supplies device - Google Patents
A kind of POE bidirectional power supplies device Download PDFInfo
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- CN108418444A CN108418444A CN201810315549.8A CN201810315549A CN108418444A CN 108418444 A CN108418444 A CN 108418444A CN 201810315549 A CN201810315549 A CN 201810315549A CN 108418444 A CN108418444 A CN 108418444A
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 18
- 230000005611 electricity Effects 0.000 claims abstract description 20
- 238000005070 sampling Methods 0.000 claims description 22
- 230000006837 decompression Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 description 10
- 239000004065 semiconductor Substances 0.000 description 9
- 239000003381 stabilizer Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013439 planning Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000012358 sourcing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/08—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in parallel
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a kind of POE bidirectional power supplies devices comprising network interface module, DC socket, anti-backflow diode, rectification module, PD modules and PSE modules；The feeder ear of the network interface module connects the output end of the input terminal and the PSE modules of the rectification module；The cathode output end of the rectification module connects the cathode of the electrode input end and the anti-backflow diode of the PD modules；The cathode output end of the rectification module connects the cathode stationary contact of the DC socket；The cathode contact of the DC socket connects the anode of the electrode input end and the anti-backflow diode of the PSE modules；The cathode movable contact of the DC socket connects the negative input of the PD modules and the negative input of the PSE modules；The cathode movable contact of the DC socket is grounded.The present invention realizes that PSE power supply states and PD are switched by electricity condition by DC socket, and the present invention has the advantages that noise is small, occupies little space.
Description
Technical field
The present invention relates to POE equipment, particularly relate to a kind of POE bidirectional power supplies device.
Background technology
In POE system, the equipment for providing power supply is referred to as power supply unit PSE (Power Sourcing
Equipment), it is known as powered device PD (Powered Device) using the equipment of power supply.PSE be responsible for by power supply inject with
Too cable, and implement the planning and management of power.And powered device PD must satisfy IEEE802.3af for PD in detecting process
In the regulation made of performance (feature).
Since in signal transmission system, other signals are typically converted into network signal, by after network transmission again
It is converted into original signal, there have been pairs of equipment in：Sending ending equipment and receiving device.Current POE skills
Art can only accomplish that receiving device is configured to PD, or sending ending equipment is configured if configuring sending ending equipment to PSE
For PD, receiving device is configured to PSE, and POE power supplies can only one-way transmission.
Chinese patent CN201510181680 provides bidirectional power supply system in a kind of Ethernet POE thus, which is
With relay come the PSE modules and PD modules in switching system, to realize the purpose of POE power supply transmitted in both directions.But it uses
Relay switches over, and has the following disadvantages：
1, relay volume itself is larger, is unfavorable for product Miniaturization Design；
2, relay will produce noise in switching, influence user experience.
Invention content
The purpose of the present invention is to provide a kind of POE bidirectional power supplies devices, and PSE power supply states and PD can be realized by electric shape
The switching of state, and have the advantages that noise is small, occupies little space.
In order to achieve the above objectives, solution of the invention is：
A kind of POE bidirectional power supplies device comprising network interface module, DC socket, anti-backflow diode, rectification module, PD modules with
And PSE modules；The feeder ear of the network interface module connects the output end of the input terminal and the PSE modules of the rectification module；
The cathode output end of the rectification module connects the cathode of the electrode input end and the anti-backflow diode of the PD modules；Institute
The cathode output end for stating rectification module connects the cathode stationary contact of the DC socket；Described in the cathode contact connection of the DC socket
The anode of the electrode input end of PSE modules and the anti-backflow diode；The cathode movable contact of the DC socket connects the PD
The negative input of the negative input of module and the PSE modules；The cathode movable contact of the DC socket is grounded.
The network interface module includes RJ45 network interfaces and the network transformer with RJ45 network interface connections；The confession of the network interface module
Electric end includes level-one feeder ear and two level feeder ear；The level-one feeder ear includes that the first level-one feeder ear and the second level-one are powered
End；The two level feeder ear includes the first two level feeder ear and the second two level feeder ear；7 feet of the RJ45 network interfaces and 8 feet connect
It connects to form the first level-one feeder ear；4 feet and 5 feet of the RJ45 network interfaces connect to form the second level-one feeder ear；Institute
Two centre caps for stating network transformer are respectively the first two level feeder ear and the second two level feeder ear.
The rectification module includes a level-one bridge rectifier and a two level bridge rectifier；The level-one bridge
Two input terminals of formula rectification circuit are separately connected the first level-one feeder ear and the second level-one feeder ear；The two level bridge rectifier
Two input terminals of circuit are separately connected one feeder ear of the second level and the second two level feeder ear；The anode output of the rectification module
End connects the cathode output end of the cathode output end and the two level bridge rectifier of the level-one bridge rectifier；It is described
The cathode output end of rectification module connects the cathode output end and two level bridge rectifier electricity of the level-one bridge rectifier
The cathode output end on road.
The cathode output end and cathode output end of the PSE modules are separately connected the first level-one feeder ear and the second level-one supplies
The cathode output end and cathode output end of electric end or the PSE modules are separately connected the second level-one feeder ear and the first level-one supplies
Electric end.
The cathode output end and cathode output end of the PSE modules are separately connected the first two level feeder ear and the second two level supplies
The cathode output end and cathode output end of electric end or the PSE modules are separately connected the second two level feeder ear and the first two level supplies
Electric end.
The PD modules include that signature resistance, PD switching circuits and DC-DC are depressured chip；The DC-DC is depressured chip
Input voltage range between 20 volts to 60 volts；The electrode input end of the PD modules connects the signature resistance
One end, the control terminal of PD switching circuits and the DC-DC are depressured the electrode input end of chip；The cathode of the PD modules inputs
The output end of the other end and PD switching circuits of the end connection signature resistance；Described in the input terminal connection of the PD switching circuits
DC-DC is depressured the negative pole end of chip.
The PSE modules include the first circuit for detecting, the second circuit for detecting, PSE switching circuit of power supply, logic or circuit and
Power circuit；The negative input of the PSE modules connects first circuit for detecting, the second circuit for detecting, PSE power switch
The ground terminal of circuit and power circuit；The current sampling resistor that the electrode input end of the PSE modules passes through the second circuit for detecting
It is connected to the input terminal of PSE switching circuit of power supply；The electrode input end of the PSE modules is also connected with the input of the power circuit
End, the output end of the power circuit connect the power end of first circuit for detecting and the second circuit for detecting；The PSE modules
Cathode output end connect the PSE switching circuit of power supply output end and first circuit for detecting sampling input terminal, institute
The cathode output end for stating PSE modules connects the ground connection of first circuit for detecting, PSE switching circuit of power supply and the second circuit for detecting
End；The output end of first circuit for detecting and the output end of the second circuit for detecting are separately connected two of the logic or circuit
The output end of input terminal, logic or circuit connects the control terminal of the PSE switching circuit of power supply.
The PSE modules further include delay circuit, the delay circuit be series at the output end of the logic or circuit with
Between the control terminal of the PSE switching circuit of power supply.
Second circuit for detecting includes current sampling resistor and operational amplifier；The both ends of the current sampling resistor point
Two input terminals of the operational amplifier are not connected；The output end of the operational amplifier connects logic or one of circuit defeated
Enter end.
First circuit for detecting is window comparator circuit.
After adopting the above scheme, the present invention is not when DC socket has power supply adaptor access, the cathode movable contact of DC socket
It is connected with cathode stationary contact point contact so that the cathode output end of rectification module is grounded, if network interface module has external PSE to set at this time
Standby access, the input voltage that external PSE device generates is input to PD modules via rectification module, after the work of PD modules is to export
Operating voltage needed for end system, due to the one-way conduction characteristic of anti-backflow diode, the input that external PSE device generates is electric
Pressure can not be input to PSE modules, and PSE modules do not work, and the present invention is in PD by electricity condition at this time；And work as has power supply in DC socket
When adapter accesses, cathode movable contact and the cathode stationary contact of DC socket disconnect, and the cathode output end of rectification module is hanging
And rectification module can not be worked, the input voltage that power supply adaptor generates at this time can be input to PD modules and PSE modules and
So that PD modules and PSE modules work at the same time so that there are voltages for the feeder ear of network interface module for output, and the present invention is by PD
Be switched to PSE power supply states by electricity condition, even and if network interface module has external PSE device access at this time, due to rectification mould
Block can not work, and PD modules also can not take electricity from external PSE device.
In summary, whether the present invention is that have power supply adaptor access to realize PSE power supply states and PD by DC socket
Switched by electricity condition, compare and switched in the prior art using relay, cost of the invention is lower, and noise is more
It is small, occupied space smaller.
Description of the drawings
Fig. 1 is the hardware block diagram of the present invention；
Fig. 2 is the circuit diagram of the network interface module of the present invention；
Fig. 3 is the circuit diagram of the DC socket of the present invention, rectification module and PD modules；
Fig. 4 is the circuit diagram of the PSE modules of the present invention.
Specific implementation mode
In order to further explain the technical solution of the present invention, being explained in detail the present invention below by specific embodiment
It states.
As shown in Figure 1, present invention is disclosed a kind of POE bidirectional power supplies devices comprising network interface module 1, is prevented DC socket J1
Counter-current diode D1, rectification module 2, PD modules 3 and PSE modules 4；The feeder ear of the network interface module 1 connects the rectification
The output end of the input terminal of module 1 and the PSE modules 4；The cathode output end of the rectification module 2 connects the PD modules 3
Electrode input end and the anti-backflow diode D1 cathode；The cathode output end of the rectification module 2 connects the DC and inserts
The cathode stationary contact of seat J1；The cathode contact of the DC socket J1 connects the electrode input end of the PSE modules 4 and described anti-reverse
Flow the anode of diode D1；The cathode movable contact of the DC socket J1 connects the negative input of the PD modules 3 and described
The negative input of PSE modules 4；The cathode movable contact of the DC socket J1 is grounded.
The operation principle of the present invention is that：Using the physical arrangement of DC socket J1 itself, the present invention is in DC socket J1 without electricity
When source adapter accesses, the cathode movable contact of DC socket J1 is connected with cathode stationary contact point contact so that the cathode of rectification module 2 is defeated
Outlet is grounded, if network interface module 1 has external PSE device access at this time, the input voltage that external PSE device generates is via whole
Flow module 2 is input to PD modules 3, and PD modules 3 work to export the operating voltage needed for back-end system, due to anti-backflow diode
The one-way conduction characteristic of D1, the input voltage that external PSE device generates can not be input to PSE modules 4, the not work of PSE modules 4
Make, the present invention is in PD by electricity condition at this time；And when DC socket J1 has power supply adaptor access, the cathode of DC socket J1 is dynamic
Contact is disconnected with cathode stationary contact, and the cathode output end of rectification module 2 is hanging and rectification module 2 can not be worked, this
When the input voltage that generates of power supply adaptor can be input to PD modules 3 and PSE modules 4 and make PD modules 3 and PSE modules 4 same
When work so that the feeder ear of network interface module 1 there are voltage for output, the present invention by PD by electricity condition be switched to PSE supply
Electricity condition, even and if network interface module 1 has external PSE device access, since rectification module 2 can not work, PD modules 3 at this time
Also electricity can not be taken from external PSE device.
In summary, the present invention be by DC socket J1 whether have power supply adaptor access come realize PSE power supply states and
PD is switched by electricity condition, is compared and is switched in the prior art using relay, and cost of the invention is lower, and noise is more
It is small, occupied space smaller.
It is of the invention for ease of understanding, the particular circuit configurations of the present invention are illustrated below.
Coordinate shown in Fig. 2, the network interface module 1 includes RJ45 network interfaces J2 and the network transformer being connect with RJ45 network interfaces J2
T1；The feeder ear of the network interface module J2 includes level-one feeder ear and two level feeder ear；The level-one feeder ear includes the 1st
Grade feeder ear and the second level-one feeder ear；The two level feeder ear includes the first two level feeder ear and the second two level feeder ear；Institute
It states 7 feet of RJ45 network interfaces J1 and 8 feet connects to form the first level-one feeder ear；4 feet of the RJ45 network interfaces J2 and the connection of 5 feet
Form the second level-one feeder ear；Two centre caps of the network transformer T1 are respectively the first two level feeder ear and
Two two level feeder ears.
Coordinate shown in Fig. 3, the rectification module 2 includes that a level-one bridge rectifier BD1 and a two level bridge-type are whole
Current circuit BD2；Coordinate shown in Fig. 2 and Fig. 3, two input terminals of the level-one bridge rectifier BD1 are separately connected the 1st
Grade feeder ear and the second level-one feeder ear；Two input terminals of the two level bridge rectifier BD2 are separately connected the second level one
Feeder ear and the second two level feeder ear；The cathode output end of the rectification module 2 connects the level-one bridge rectifier BD1's
The cathode output end of cathode output end and the two level bridge rectifier BD2；The cathode output end of the rectification module 2 connects
The cathode output end of the cathode output end of the level-one bridge rectifier BD1 and the two level bridge rectifier BD2.Pass through
Level-one bridge rectifier BD1 and two level bridge rectifier BD2, the present invention can be compatible with using the external of mid-span method
PSE device and access using the end transboundary external PSE device of method；Wherein set when using the external PSE of mid-span method
It is whole that the BD1 progress of level-one bridge rectifier is will pass through for the output voltage that when being linked into RJ45 network interface J2, which generates
Stream；And when the external PSE device for bridging method using end is linked into RJ45 network interfaces, the input voltage of PSE device generation
Rectification is then carried out by two level bridge rectifier BD2.It should be noted that the invention is not limited in the rectification modules 2
Can also be the rectification module 2 including a level-one bridge rectifier BD1 and a two level bridge rectifier BD2
A two level bridge rectifier BD2 is only included including a level-one bridge rectifier BD1 either rectification modules 2,
The present invention may be only available for may be only available for adopting using the access either present invention of the external PSE device of mid-span method in this way
With the access of the end transboundary external PSE device of method.
Coordinate shown in Fig. 3, the PD modules 3 include that signature resistance R1, PD switching circuit 31 and DC-DC are depressured chip
U1；The input voltage range of the DC-DC decompression chips U1 is between 20 volts to 60 volts；The anode of the PD modules 3
Input terminal connects one end of the signature resistance R1, the control terminal of PD switching circuits 31 and DC-DC decompression chips U1's
Electrode input end；The negative input of the PD modules 3 connects the other end and PD switching circuits 31 of the signature resistance R1
Output end；The input terminal of the PD switching circuits 31 connects the negative pole end of the DC-DC decompression chips U1；The wherein described PD switches
Metal-oxide-semiconductor switching circuit may be used in circuit 31, specifically, the PD switching circuits 31 include 3rd resistor R3, the 4th resistance R4,
One end of first voltage-stabiliser tube Z1 and the first metal-oxide-semiconductor Q1, the 3rd resistor R3 connect one end and the institute of the signature resistance R1
State the electrode input end of DC-DC decompression chips U1；The other end of the 3rd resistor R3 connects the negative of the first voltage-stabiliser tube Z1
Pole, the anode of the first voltage-stabiliser tube Z1 connects the grid of one end and the first metal-oxide-semiconductor Q1 of the 4th resistance R4, described
The other end of 4th resistance R4 connects the source electrode of the other end and the first metal-oxide-semiconductor Q1 of the signature resistance R1, and described first
The drain electrode of metal-oxide-semiconductor Q1 connects the negative pole end of the DC-DC decompression chips U1.The PD modules 3 can be made by the resistance R1 that signs
It obtains external PSE device to be authenticated the PD modules 3, specifically, external PSE device is relatively low by exporting an electric current
Exploration electric current to PD modules 3, the exploration electric current to sign resistance R1 generates an exploration voltage, which can not make
It obtains PD switching circuits 31 to be connected, whether the occurrence that voltage is soundd out in PSE device external at this time detection simultaneously judges the exploration voltage
In can be in the range of voltage values by certification, if in can be by the way that in the range of voltage values of certification, certification passes through, external
PSE device improve output voltage so that PD switching circuits 31 are connected, DC-DC is depressured chip U1 work to export rear end at this time
Operating voltage needed for system.The present invention is depressured chip U1 by the DC-DC can then make present invention receiving external
The range for the input voltage that PSE device or power supply adaptor generate can reach 20 volts to 60 volts so that the present invention can be simultaneous
Appearance standard PSE device can also be compatible with customized low-voltage PSE device.
Coordinate shown in Fig. 4, the PSE modules 4 include the first circuit for detecting 41, the second circuit for detecting 42, PSE power switch
Circuit 44, logic or circuit 43 and power circuit 45；Coordinate shown in Fig. 3 and Fig. 4, the negative input of the PSE modules 4 connects
The ground terminal of first circuit for detecting 41, the second circuit for detecting 42, PSE switching circuit of power supply 44 and power circuit 45；It is described
The electrode input end of PSE modules 4 is connected to PSE switching circuit of power supply by the current sampling resistor R13 of the second circuit for detecting 42
44 input terminal；The electrode input end of the PSE modules 4 is also connected with the input terminal of the power circuit 45, the power circuit
45 output end connects the power end of first circuit for detecting, 41 and second circuit for detecting 42；The anode of the PSE modules 4 is defeated
Outlet connects the sampling input terminal of the output end and first circuit for detecting 41 of the PSE switching circuit of power supply 44, the PSE
The cathode output end of module 4 connects connecing for first circuit for detecting 41, PSE switching circuit of power supply 44 and the second circuit for detecting 42
Ground terminal；The output end of the output end of first circuit for detecting 41 and the second circuit for detecting 42 is separately connected the logic or circuit
The output end of 43 two input terminals, logic or circuit 43 connects the control terminal of the PSE switching circuit of power supply 44.Coordinate Fig. 3
Shown in Fig. 4, the negative input and cathode output end of the PSE modules 4 can be connected to the defeated of the PD switching circuits 31
Enter end, the PSE modules 4 in this way are controlled by the PD modules 3；It should be noted that the negative input of the PSE modules 4
The cathode movable contact of the DC socket J1 can also be directly connected to cathode output end, the PSE modules 4 are just not controlled by this way
The PD modules 3.Coordinate shown in Fig. 2 and Fig. 4, the cathode output end and cathode output end of the PSE modules 4 are separately connected first
Level-one feeder ear and the second level-one feeder ear, the in this way present invention are just exported using mid-span method, the first level-one feeder ear
It is respectively then anode and cathode with the second level-one feeder ear, herein it should be noted that the first level-one feeder ear and the second level-one
The polarity of feeder ear can be exchanged, i.e. the cathode output end and cathode output end of the PSE modules 4 are separately connected the 2nd 1
Grade feeder ear and the first level-one feeder ear are so that the first level-one feeder ear and the second level-one feeder ear are respectively cathode and anode.
And the invention is not limited in being exported using mid-span method, it is defeated that the present invention can also use end bridging method to carry out
Go out, i.e., the present invention can also be that the cathode output end of the PSE modules 4 and cathode output end are separately connected the first two level feeder ear
It is separately connected the power supply of the second two level with the cathode output end and cathode output end of the second two level feeder ear or the PSE modules 4
End and the first two level feeder ear.
Coordinate shown in Fig. 4, the power circuit 45 includes the 5th resistance R5, the 6th resistance R6 and the second voltage-stabiliser tube Z2；
The electrode input end of the PSE modules 4 connects one end of one end and the 6th resistance R6 of the 5th resistance R5, and described
The cathode of two voltage-stabiliser tube Z2 connects the other end of the other end and the 6th resistance R6 of the 5th resistance R5, and described second is steady
The anode of pressure pipe Z2 connects the negative input and cathode output end of the PSE modules 4, the 5th resistance R5, the 6th resistance
The common end of R6 and the second voltage-stabiliser tube Z2 are the output end of the power circuit 45；By the power circuit 45 with to first
Circuit for detecting 41 and the second circuit for detecting 42 are powered.
Coordinate shown in Fig. 4, first circuit for detecting 41 is a window comparator circuit, first circuit for detecting 41
Including the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12
And first comparator U21 and the second comparator U22；One end of the 7th resistance R7 of output end connection of the power circuit 45,
The power supply of one end of the tenth resistance R10, one end of twelfth resistor R12 and first comparator U21 and the second comparator U22
End, the other end of the 7th resistance R7 connect the in-phase input end of one end and first comparator U21 of the 8th resistance R8, the 8th resistance
The inverting input of one end and the second comparator U22 of the other end connection resistance R9 of R8, the other end connection of the 9th resistance R9
The negative input and cathode output end of the PSE modules 4, the ground terminal of the first comparator U21 and the second comparator U22
Connect the negative input and cathode output end of the PSE modules 4；The other end of the tenth resistance R10 connects the PSE moulds
The cathode output end of block 4, the one end eleventh resistor R11, the inverting input of first comparator U21 and the second comparator U22
In-phase input end, the output end of the other end connection first comparator U21 of the twelfth resistor R12, the second comparator U22
One input terminal of output end and logic or circuit 43.By the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, institute can be set
State the upper limit voltage and lower voltage limit of the first circuit for detecting 41, the common end of the tenth resistance R10 and eleventh resistor R11 are institute
The sampling input terminal for stating the first circuit for detecting 41 can be authenticated PD equipment by first circuit for detecting 41, specifically,
When PD equipment is legitimate device, voltage that the signature resistance in PD equipment is generated in sampling input terminal be just in upper limit voltage and
Between lower voltage limit, first circuit for detecting 41 exports in high level to logic or circuit 43；When PD equipment is illegality equipment
When, the voltage that the signature resistance in PD equipment is generated in sampling input terminal is not between upper limit voltage and lower voltage limit, described
First circuit for detecting 41 exports in low level to logic or circuit 43.
Coordinate shown in Fig. 4, second circuit for detecting 42 includes current sampling resistor R13 and operational amplifier U3；It is described
The both ends of current sampling resistor R13 are separately connected two input terminals of the operational amplifier U3；The output of operational amplifier U3
One input terminal of end connection logic or circuit 43, the output end of the power end connection power circuit 45 of operational amplifier U3, fortune
The ground terminal for calculating amplifier U3 connects the negative input and cathode output end of the PSE modules 4；When the present invention supplies PD equipment
It when electric, have certain electric current and flows through current sampling resistor R13 so that the both ends current sampling resistor R13 generate a sampling electricity
Pressure, the sampled voltage generate a high level via operational amplifier U3 amplifications and are input in logic or circuit 43；And work as electric current
The electric current that sampling resistor R13 flows through is zero or close to zero, then operational amplifier U3 amplification generation low levels are input to and patrol
Volume or circuit 43 in.
Integrated or door may be used in the logic or circuit 43, and the logic or circuit 43 can also be by two same phases simultaneously
The diode of connection forms, and the anode of the two diodes is two input terminals of the logic or circuit 43, the two two poles
The cathode of pipe collectively forms the output end of the logic or circuit 43.
Coordinate shown in Fig. 4, the PSE switching circuit of power supply 44 includes the second metal-oxide-semiconductor Q2, the 14th resistance R14, the 15th
Resistance R15, triode Q3 and diode D2；The source electrode of second metal-oxide-semiconductor Q2 connects to be formed with one end of the 14th resistance R14
The input terminal of the PSE switching circuit of power supply 44, the anode of the drain electrode connection diode D2 of the second metal-oxide-semiconductor Q2, diode
The cathode of D2 is the output end of the PSE switching circuit of power supply 44；The other end connection described the of the 14th resistance R14
One end of the grid and the 15th resistance R15 of two metal-oxide-semiconductor Q2, the other end connecting triode Q3's of the 15th resistance R15
Collector, the emitter of the triode Q3 connect the negative input and cathode output end of the PSE modules 4, three pole
The base stage of pipe Q3 is the control terminal of the PSE switching circuit of power supply 44.
When the DC socket J1 of the present invention has power supply adaptor access, the operation principle of the PSE modules 4 is：When this hair
Bright when not accessing PD equipment, the first circuit for detecting 41 and the second circuit for detecting 42 export low level, at this time logic or circuit 43
Control terminal of the low level to the PSE switching circuit of power supply 44 is exported, the PSE switching circuit of power supply 44 turns off；Work as the present invention
When accessing illegal PD equipment, voltage that signature resistance in illegal PD equipment generates is unsatisfactory for desired range, therefore the
One circuit for detecting 41 exports low level, and the PSE switching circuit of power supply 44 is also in off state, current sampling resistor at this time
R13 both end voltages are identical, and the second circuit for detecting 42 or output low level, the PSE switching circuit of power supply 44 can not be opened, this
Invention will not power to illegal PD equipment；When the present invention accesses legal PD equipment, the signature electricity in legal PD equipment
The voltage that resistance generates meets required range, and the first circuit for detecting 41 exports high level and makes logic or the high electricity of circuit output
It puts down to the control terminal of the PSE switching circuit of power supply 44 so that the PSE switching circuit of power supply 44 is connected, and the present invention can be to
Legal PD equipment power supply, while power supply, the voltage of the sampling input terminal of the first circuit for detecting 41 becomes supply voltage, the confession
Piezoelectric voltage makes the first circuit for detecting 41 export low level more than the upper limit voltage of the first circuit for detecting 41, but due at this time
Current sampling resistor R13 has electric current to flow through and makes the second circuit for detecting 42 output high level, so that logic or circuit are protected
Output high level is held, the PSE switching circuit of power supply 44 tends to remain on so that the present invention continues to supply to legal PD equipment
Electricity.
Further, when accessing legal PD equipment, in order to keep powered stable, the PSE modules 4 further include delay circuit
46；The delay circuit 46 is series at the control of the output end and the PSE switching circuit of power supply 44 of the logic or circuit 43
Between end.Effective high level that logic or circuit 43 export can be made to be kept for one end time by delay circuit 46, to realize
First circuit for detecting 41 and stablizing for the second circuit for detecting 42 are connected.The delay circuit 46 may be used RC delay circuits or
It is 555 delay circuits.
Herein it should be noted that PD modules 3 of the present invention are not limited to using signature resistance R1, PD switch electricity
The circuit structure that road 31 and DC-DC decompressions chip U1 are constituted, PSE modules 4 of the present invention are also not limited to using the
One circuit for detecting 41, the second circuit for detecting 42, PSE switching circuit of power supply 43, logic or circuit 44, power circuit 45 and delay
The circuit structure that circuit 46 is constituted, key of the invention are whether have power supply adaptor access to control by DC socket J1
The working condition of PSE modules 4 and PD modules 3, therefore PD modules 3 of the present invention and the PSE modules 4 can also use
Existing other structures PD modules and PSE modules.
The product form and style of above-described embodiment and schema and the non-limiting present invention, any technical field it is common
The appropriate changes or modifications that technical staff does it all should be regarded as the patent category for not departing from the present invention.
Claims (10)
1. a kind of POE bidirectional power supplies device, it is characterised in that：Including network interface module, DC socket, anti-backflow diode, rectification mould
Block, PD modules and PSE modules；
The feeder ear of the network interface module connects the output end of the input terminal and the PSE modules of the rectification module；
The cathode output end of the rectification module connects the electrode input end of the PD modules and bearing for the anti-backflow diode
Pole；The cathode output end of the rectification module connects the cathode stationary contact of the DC socket；
The cathode contact of the DC socket connects the anode of the electrode input end and the anti-backflow diode of the PSE modules；
The cathode movable contact of the DC socket connects the negative input of the PD modules and the negative input of the PSE modules；
The cathode movable contact of the DC socket is grounded.
2. a kind of POE bidirectional power supplies device as described in claim 1, it is characterised in that：The network interface module includes RJ45 nets
Mouth and the network transformer with RJ45 network interface connections；The feeder ear of the network interface module includes level-one feeder ear and two level power supply
End；The level-one feeder ear includes the first level-one feeder ear and the second level-one feeder ear；The two level feeder ear includes the one or two
Grade feeder ear and the second two level feeder ear；7 feet and 8 feet of the RJ45 network interfaces connect to form the first level-one feeder ear；Institute
It states 4 feet of RJ45 network interfaces and 5 feet connects to form the second level-one feeder ear；Two centre caps of the network transformer point
It Wei not the first two level feeder ear and the second two level feeder ear.
3. a kind of POE bidirectional power supplies device as described in claim 1, it is characterised in that：The rectification module includes one one
Grade bridge rectifier and a two level bridge rectifier；Two input terminals of the level-one bridge rectifier are separately connected
First level-one feeder ear and the second level-one feeder ear；Two input terminals of the two level bridge rectifier are separately connected the second level
One feeder ear and the second two level feeder ear；The cathode output end of the rectification module is connecting the level-one bridge rectifier just
The cathode output end of pole output end and the two level bridge rectifier；The cathode output end connection described one of the rectification module
The cathode output end of the cathode output end and the two level bridge rectifier of grade bridge rectifier.
4. a kind of POE bidirectional power supplies device as claimed in claim 2, it is characterised in that：The cathode output end of the PSE modules
The cathode output end of the first level-one feeder ear and the second level-one feeder ear or the PSE modules is separately connected with cathode output end
It is separately connected the second level-one feeder ear and the first level-one feeder ear with cathode output end.
5. a kind of POE bidirectional power supplies device as claimed in claim 2, it is characterised in that：The cathode output end of the PSE modules
The cathode output end of the first two level feeder ear and the second two level feeder ear or the PSE modules is separately connected with cathode output end
It is separately connected the second two level feeder ear and the first two level feeder ear with cathode output end.
6. a kind of POE bidirectional power supplies device as described in claim 1, it is characterised in that：The PD modules include signature resistance,
PD switching circuits and DC-DC are depressured chip；The input voltage range of the DC-DC decompressions chip is between 20 volts to 60 volts
Between；
The electrode input end of the PD modules connects described signature one end of resistance, the control terminal of PD switching circuits and described
DC-DC is depressured the electrode input end of chip；The negative input of the PD modules connects the other end and PD of the signature resistance
The output end of switching circuit；The input terminal of the PD switching circuits connects the negative pole end of the DC-DC decompressions chip.
7. a kind of POE bidirectional power supplies device as described in claim 1, it is characterised in that：The PSE modules include the first detecting
Circuit, the second circuit for detecting, PSE switching circuit of power supply, logic or circuit and power circuit；
The negative input of the PSE modules connects first circuit for detecting, the second circuit for detecting, PSE switching circuit of power supply
With the ground terminal of power circuit；
The electrode input end of the PSE modules is connected to PSE power switch electricity by the current sampling resistor of the second circuit for detecting
The input terminal on road；
The electrode input end of the PSE modules is also connected with the input terminal of the power circuit, and the output end of the power circuit connects
Connect the power end of first circuit for detecting and the second circuit for detecting；
The cathode output end of the PSE modules connects the output end of the PSE switching circuit of power supply and first circuit for detecting
Sampling input terminal, the cathode output ends of the PSE modules connects first circuit for detecting, PSE switching circuit of power supply and the
The ground terminal of two circuit for detecting；
The output end of first circuit for detecting and the output end of the second circuit for detecting are separately connected the two of the logic or circuit
The output end of a input terminal, logic or circuit connects the control terminal of the PSE switching circuit of power supply.
8. a kind of POE bidirectional power supplies device as claimed in claim 7, it is characterised in that：The PSE modules further include delay electricity
Road, the delay circuit are series between the output end of the logic or circuit and the control terminal of the PSE switching circuit of power supply.
9. a kind of POE bidirectional power supplies device as claimed in claim 7, it is characterised in that：Second circuit for detecting includes electricity
Flow sampling resistor and operational amplifier；The both ends of the current sampling resistor are separately connected two inputs of the operational amplifier
End；The output end connection logic of operational amplifier or an input terminal of circuit.
10. a kind of POE bidirectional power supplies device as claimed in claim 7, it is characterised in that：First circuit for detecting is window
Comparator circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810315549.8A CN108418444A (en) | 2018-04-10 | 2018-04-10 | A kind of POE bidirectional power supplies device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810315549.8A CN108418444A (en) | 2018-04-10 | 2018-04-10 | A kind of POE bidirectional power supplies device |
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| Publication Number | Publication Date |
|---|---|
| CN108418444A true CN108418444A (en) | 2018-08-17 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810315549.8A Pending CN108418444A (en) | 2018-04-10 | 2018-04-10 | A kind of POE bidirectional power supplies device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111245628A (en) * | 2020-03-20 | 2020-06-05 | 北京华信傲天网络技术有限公司 | Power receiving equipment supporting double-network-port Ethernet power receiving and power receiving system |
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