CN107147080B - A kind of charger and its protection circuit based on Power over Ethernet - Google Patents
A kind of charger and its protection circuit based on Power over Ethernet Download PDFInfo
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- CN107147080B CN107147080B CN201710438389.1A CN201710438389A CN107147080B CN 107147080 B CN107147080 B CN 107147080B CN 201710438389 A CN201710438389 A CN 201710438389A CN 107147080 B CN107147080 B CN 107147080B
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- 230000004224 protection Effects 0.000 title claims abstract description 37
- 230000009514 concussion Effects 0.000 claims abstract description 5
- 230000015556 catabolic process Effects 0.000 claims description 40
- 230000008878 coupling Effects 0.000 claims description 29
- 238000010168 coupling process Methods 0.000 claims description 29
- 238000005859 coupling reaction Methods 0.000 claims description 29
- 239000003990 capacitor Substances 0.000 claims description 16
- 239000003381 stabilizer Substances 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 9
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 230000005669 field effect Effects 0.000 description 11
- 208000031361 Hiccup Diseases 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/10—Current supply arrangements
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention is suitable for power over Ethernet field, provides a kind of charger based on Power over Ethernet and its protection circuit, comprising: voltage regulation unit, biasing charge/discharge unit, first switch unit and second switch unit；When the charger based on Power over Ethernet protects short circuit, the secondary end of transformer can export low level, so that second switch unit no longer output level controls signal, biasing charge/discharge unit is acted on due to losing the bypass of second switch unit, it starts to charge, when the charging voltage for biasing charge/discharge unit reaches preset charged threshold value, when the control terminal of first switch unit is on level, the truncation of first switch unit, therefore power supply chip stops working, and then stop the concussion to transformer so that the above-mentioned charger protection circuit based on Power over Ethernet stops working.To be effectively prevented from transformer and power supply chip be in high-temperature work environment, protect transformer and power supply chip not destroyed, circuit structure is simple, and realization facilitates.
Description
Technical field
The invention belongs to power over Ethernet field more particularly to a kind of chargers and its guarantor based on Power over Ethernet
Protection circuit.
Background technique
Power over Ethernet (Power Over Ethernet, POE) refers to being routed basis in existing Ethernet Cat.5
In the case that framework does not make any changes, for some IP-based terminals (such as IP telephone machine, wireless local network connecting point
The terminal devices such as AP, web camera) transmission data-signal while, also thus Terminal Type equipment provide direct current supply skill
Art.POE technology can guarantee the normal operation of existing network while ensuring that existing structure is routed safe, simplify system cloth
Line reduces the construction cost of network infrastructure.However it is abnormal to there is short circuit in circuit in the engineering used for POE charger
The case where when, POE power supply chip can enter " hiccup protections mode ", not damaged with protection power source chip.So-called " hiccup protections mould
Formula ", the operating mode that power supply chip is constantly restarted caused by referring to due to the short-circuit exception of circuit appearance, however, working as power supply core
" hiccup protections mode " occurs for a long time in piece will lead to transformer and the raising of power supply chip temperature so that damage.
In summary, it is existing based on the charger of Power over Ethernet occur short circuit it is abnormal when, exist due to power supply core
The problem of there is " hiccup protections mode " for a long time and transformer and power supply chip is caused to be damaged in piece.
Summary of the invention
The present invention provides a kind of charger based on Power over Ethernet and its protection circuits, it is intended to solve existing be based on
The charger of Power over Ethernet occur short circuit it is abnormal when, exist since " hiccup protections mode " occurs for a long time in power supply chip and
The problem of causing transformer and power supply chip to be damaged.
The present invention provides a kind of, and the charger based on Power over Ethernet protects circuit, the confession based on Power over Ethernet
Protective circuit for electric appliance includes:
Voltage regulation unit, biasing charge/discharge unit, first switch unit and second switch unit；
The input terminal of the voltage regulation unit is connect with the power supply for providing supply voltage, the output end of the voltage regulation unit
It is connect with the input terminal of the biasing charge/discharge unit, the output end and the first switch unit of the biasing charge/discharge unit
Control terminal connection, the input terminal of the first switch unit connect with transformer, the output end of the first switch unit and
Power supply chip connection, the input terminal of the second switch unit are connect with the secondary end of the transformer, the second switch list
The output end of member is connect with the biasing charge/discharge unit；
When the power supply, which starts to provide, shakes hands voltage, while the power supply starts as the transformer-supplied
When, the voltage of shaking hands is not more than the breakdown voltage of the voltage regulation unit, i.e., the described voltage regulation unit is not breakdown, and the biasing is filled
Discharge cell power loss does not work, and keeps low level output so that the first switch unit is connected, and then makes the power supply chip
It must establish by cable and begin to carry out work of shaking hands according to professional standard and the power supply, the transformer does not obtain the power supply chip
Oscillator signal is because without output coupling output voltage, the second switch unit is not turned on, the output of no level controling signal, i.e., without
Bypass effect；
When the power supply chip and the power supply are shaken hands successfully, the supply voltage restores professional standard and is greater than
The breakdown voltage of the voltage regulation unit, i.e., the described voltage regulation unit is breakdown, when the voltage regulation unit is breakdown, the biasing charge and discharge
Electric unit originate the electric stage is equivalent to short circuit, relay exports low level, so that the first switch unit is still maintained and led
It is logical, and then so that the power supply chip is continued work once electrified and export oscillator signal to the transformer, the transformer obtains institute
It states oscillator signal and starts output coupling output voltage；
When the secondary end output coupling output voltage of the transformer is to when loading, the second switch unit obtains conductance
Logical, output level controls signal so that the biasing charge/discharge unit is bypassed, even if the biasing charge/discharge unit is persistently protected
Low level is held so that the first switch unit is connected, so that the power supply chip works, the secondary end of the transformer continues
Output coupling output voltage；
When short circuit occurs for the charger output based on Power over Ethernet, the secondary end of the transformer is short-circuited into
Low level, the second switch unit power loss are not turned on, and no level controling signal output, the biasing charge/discharge unit loses side
Road acts on and then starts to charge, when the charging voltage of the biasing charge/discharge unit reaches preset charged threshold value, described first
Switch unit truncation so that the power supply chip power loss stops working, and then stops exporting the oscillator signal to the transformation
Device, so that the transformer stops working.
A kind of charger based on Power over Ethernet, including power supply chip and transformer, the transformer first input end
It is connect with the power supply for providing supply voltage, the second input terminal of the transformer is connect with the power supply chip, the base
It further include that the above-mentioned charger based on Power over Ethernet protects circuit in the charger of Power over Ethernet, it is described to be supplied based on Ethernet
The charger protection circuit of electricity is connect with the transformer and the power supply chip respectively.
Charger and its protection circuit provided by the invention based on Power over Ethernet, by starting to provide in power supply
Shake hands voltage when, due to shake hands voltage be not more than voltage regulation unit breakdown voltage, voltage regulation unit is not breakdown, regardless of distribution
It is depressed into biasing charge/discharge unit, therefore biases charge/discharge unit and exports low level, so that the control terminal of first switch unit is low
Level, thus first switch unit is connected and then power supply chip is made to work, it is state of shaking hands due at this time, does not export
Voltage, therefore second switch unit is not due to having input voltage to be not turned on, no low level output, when power supply chip and power supply are held
When hand success, supply voltage is greater than the breakdown voltage of voltage regulation unit, therefore voltage regulation unit is connected, and exports voltage of voltage regulation to biasing
Charge/discharge unit is biased charge/discharge unit and is equivalent to short circuit due to voltage regulation unit breakdown moment, therefore biases charge and discharge list
Member still exports low level and works as change so that power supply chip continues working so that the control terminal of first switch unit is in low level
For the normal output coupling output voltage of depressor to when loading, second switch unit conducting, output level controls signal, so that biasing is filled
Discharge cell is bypassed to low level, and then first switch unit is connected, so that the power supply chip continues working, the change
The secondary end of depressor continues output coupling output voltage, described when the charger based on Power over Ethernet protects short circuit
The secondary end of transformer can export low level so that second switch unit no longer exports low level, biasing charge/discharge unit due to
The bypass effect for losing second switch unit, starts to charge, when the charging voltage of biasing charge/discharge unit reaches preset charged threshold
When value, when the control terminal of first switch unit is in high level, the truncation of first switch unit, therefore power supply chip stops working,
And then stop output oscillator signal to transformer so that transformer stops working, so that the above-mentioned charger based on Power over Ethernet
It stops working.It is in high-temperature work environment to be effectively prevented from transformer and power supply chip, protects transformer and power supply chip
Not destroyed, circuit structure is simple, and it is convenient to realize.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram of the charger protection circuit provided in an embodiment of the present invention based on Power over Ethernet；
Fig. 2 is the circuit structure signal of the charger protection circuit provided in an embodiment of the present invention based on Power over Ethernet
Figure.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
It should be noted that term " includes " and their any changes in description and claims of this specification
Shape, it is intended that cover and non-exclusive include.Such as system, product or the equipment comprising a series of units are not limited to arrange
Unit out, but optionally further comprising the step of not listing or unit, or optionally further comprising for these products or set
Standby intrinsic other units.In addition, term " first ", " second " and " third " etc. be for distinguishing different objects, not for
Particular order is described.
The embodiment of the present invention in order to solve it is existing based on the charger of Power over Ethernet occur short circuit it is abnormal when, exist
The problem of causing transformer and power supply chip to be damaged due to power supply chip appearance " hiccup protections mode " for a long time, provide one
Charger and its protection circuit kind based on Power over Ethernet, by when power supply starts to provide and shakes hands voltage, due to holding
Flashlight pressure is not more than the breakdown voltage of voltage regulation unit, therefore voltage regulation unit is not breakdown, is depressed into biasing charge and discharge list regardless of distribution
Member, therefore bias charge/discharge unit and export low level, so that the control terminal of first switch unit is low level, thus make first to open
It closes unit to be connected and then power supply chip is made to work, shake hands state due at this time, there is no an output voltage, therefore second switch list
Member is not due to having input voltage to be not turned on, no low level output, when power supply chip is shaken hands successfully with power supply, supply voltage
Greater than the breakdown voltage of voltage regulation unit, therefore voltage regulation unit is connected, and exports voltage of voltage regulation to charge/discharge unit is biased, due to steady
The moment for pressing unit breakdown, biasing charge/discharge unit are equivalent to short circuit, therefore bias charge/discharge unit and still export low level
So that the control terminal of first switch unit is in low level, so that power supply chip continues working, when the normal output coupling of transformer
For output voltage to when loading, second switch unit conducting, output level controls signal, so that biasing charge/discharge unit is bypassed to
Low level, and then first switch unit is connected, so that the power supply chip continues working, the secondary end of the transformer continues
Output coupling output voltage, when the charger based on Power over Ethernet protects short circuit, the secondary end meeting of the transformer
Low level is exported, so that second switch unit no longer exports low level, biases charge/discharge unit due to losing second switch unit
Bypass effect, start to charge, when bias charge/discharge unit charging voltage reach preset charged threshold value when, first switch unit
Control terminal when being in high level, first switch unit truncation, therefore power supply chip stops working, and then stops output concussion letter
Number to transformer so that transformer stops working, so that the above-mentioned charger protection circuit based on Power over Ethernet stops working.
To be effectively prevented from transformer and power supply chip is in high-temperature work environment, protect transformer and power supply chip not destroyed,
Circuit structure is simple, and it is convenient to realize.
In order to illustrate a kind of above-mentioned charger and its protection circuit based on Power over Ethernet, below in conjunction with specific reality
Example is applied to be described in detail:
Fig. 1 shows the structure of the charger protection circuit provided in an embodiment of the present invention based on Power over Ethernet, in order to
Convenient for explanation, only parts related to embodiments of the present invention are shown, and details are as follows:
As shown in Figure 1, the charger protection circuit 10 based on Power over Ethernet includes:
Voltage regulation unit 110, biasing charge/discharge unit 120, first switch unit 130 and second switch unit 140.
The input terminal of voltage regulation unit 110 is connect with the power supply VCC for providing supply voltage, the output of voltage regulation unit 110
It holds and is connect with the input terminal of biasing charge/discharge unit 120, bias the output end and first switch unit 130 of charge/discharge unit 120
Control terminal connection, the input terminal of first switch unit 130 connect with transformer T1, the output end of first switch unit 130 and
Power supply chip U1 connection, the input terminal of second switch unit 140 are connect with the output end of transformer T1, second switch unit 140
Output end with biasing charge/discharge unit 120 connect.
When power supply VCC, which starts to provide, shakes hands voltage, while when power supply VCC starts as transformer-supplied T1,
Voltage of shaking hands is not more than the breakdown voltage of voltage regulation unit 110, i.e. voltage regulation unit 110 is not breakdown, and biasing charge/discharge unit 120 loses
Electricity does not work, and keeps low level output so that first switch unit 130 is connected, and then makes power supply chip U1 that must establish the beginning by cable according to row
Industry standard and power supply VCC carry out work of shaking hands, and transformer T1 does not obtain the oscillator signal of power supply chip U1 because without exporting
Output voltage is coupled, second switch unit 140 is not turned on, and no level controling signal output, i.e. none-disk terminal acts on.
When power supply chip U1 and power supply VCC shake hands successfully, voltage value restores professional standard and is greater than pressure stabilizing
The breakdown voltage of unit 110, i.e. voltage regulation unit 110 are breakdown, output voltage of voltage regulation to biasing charge/discharge unit 120, pressure stabilizing list
When member 110 is breakdown, biasing charge/discharge unit 120 originate the electric stage is equivalent to short circuit, relay exports low level, so that the
One switch unit 130 remains on, and then obtains power supply chip U1 and electric continue working and export oscillator signal to the change
Depressor T1, transformer T1 obtain oscillator signal and start output coupling output voltage.
When the secondary end output coupling output voltage of transformer T1 is to when loading, second switch unit 140 must be conducted, defeated
Level controling signal is so that biasing charge/discharge unit 120 is bypassed, even if biasing charge/discharge unit 120 persistently keeps low level out
So that first switch unit 130 is connected, so that power supply chip U1 works, the secondary end of transformer T1 continues output coupling output electricity
Pressure.
When short circuit occurs for the charger output based on Power over Ethernet, the secondary end of transformer T1 is short-circuited into low electricity
Flat, 140 power loss of second switch unit is not turned on, and no level controling signal output, biasing charge/discharge unit 120 loses bypass effect
And then start to charge, when the charging voltage for biasing charge/discharge unit 120 reaches preset charged threshold value, first switch unit 130
Truncation so that power supply chip U1 power loss stops working, and then stops output oscillator signal to transformer T1, so that transformer T1 stops
Only work.
It should be noted that the charger protection circuit 10 based on Power over Ethernet can be with the confession based on Power over Ethernet
The transformer T1 and power supply chip U1 connection, transformer T1 first input end of electric appliance are connect with supply voltage VCC, transformer T1
The second input terminal connect with power supply chip U1, the secondary end output coupling output voltage of transformer T1 is to loading, power supply chip
U1 refers to POE power supply chip.
It should be noted that the biography of some control information adjoint when the transmission of practical application information between communication equipment
It passs, they work according to set communications protocol, and application message is transmitted to destination safe, reliable, efficiently." shaking hands " just
Be two equipment before a communication, the movement being first mutually distinguishable according to standard communication protocol, after being mutually distinguishable could mutually
Transmit information.When power supply chip and power supply are shaken hands, voltage of shaking hands is relatively low, no more than the electric conduction of voltage regulation unit
It presses, above-mentioned conducting voltage refers to, voltage regulation unit minimum voltage required when being connected.
It is preset in order to make above-mentioned first switch unit it should be noted that above-mentioned preset charged threshold value refers to
The charging voltage of biasing charge/discharge unit output when control terminal is in high level.
It should also be noted that, above-mentioned level controling signal, which can be high level, is also possible to low level, it is different when selecting
Component when, the level controling signal be different level.
Further, in embodiments of the present invention, biasing charge/discharge unit 120 includes: bias unit 121 and RC charge and discharge
Unit 122.
Bias unit 121 is connect with RC charge/discharge unit 122, and the input terminal and output end of bias unit 121 are respectively inclined
Set the input terminal and output end of charge/discharge unit 120, the input terminal of RC charge/discharge unit 122 is defeated with second switch unit 140
Outlet connection.
When power supply VCC start provide shake hands voltage when, while power supply VCC start for transformer T1 power supply when,
Voltage of shaking hands is not more than the breakdown voltage of voltage regulation unit 110, i.e. voltage regulation unit 110 is not breakdown, bias unit 121 and RC charge and discharge
122 power loss of electric unit does not work, and keeps low level output so that first switch unit 130 is persistently held on, and then makes power supply
Chip U1 work once electrified, transformer T1 do not obtain the oscillator signal of power supply chip U1 because without output coupling output voltage, and second
Switch unit 140 is not turned on, no level controling signal output.
When power supply chip U1 and power supply VCC shake hands successfully, supply voltage is greater than the breakdown potential of voltage regulation unit 110
Pressure, i.e., voltage regulation unit 110 is breakdown, output voltage of voltage regulation to bias unit 121, when voltage regulation unit 110 is breakdown, RC charge and discharge
Unit 122 originate the electric stage is equivalent to short circuit, 122 relay of RC charge/discharge unit exports low level, and power time needs are greater than
The power supply chip work, which generates, shakes the required time, so that first switch unit 130 is connected, and then makes power supply chip U1
Continue work once electrified, and export oscillator signal to transformer T1, transformer T1 obtain oscillator signal start output coupling output electricity
Pressure.
When the secondary end output coupling output voltage of transformer T1 is to when loading, second switch unit 140 must be conducted, defeated
Level controling signal is so that bias unit 121 and RC charge/discharge unit 122 are bypassed into low level, even if bias unit 121 out
Persistently keep low level so that first switch unit 130 is persistently held on, so that power supply chip U1 persistently keeps work, transformation
The secondary end of device T1 continues output coupling output voltage.
When short circuit occurs for the charger output based on Power over Ethernet, the secondary end of transformer T1 exports low level, the
Two switch units 140 are not turned on, no low level output, and bias unit 121 and RC charge/discharge unit 122 are not bypassed, RC charge and discharge
Electric unit 122 starts to charge, when the charging voltage of RC charge/discharge unit 122 reaches preset charged threshold value, first switch unit
130 truncations so that power supply chip U1 power loss stops working, and then stop output oscillator signal to transformer T1, so that transformer
T1 stops working.
Fig. 2 shows provided in an embodiment of the present invention, and the charger based on Power over Ethernet protects the circuit structure of circuit,
For ease of description, only parts related to embodiments of the present invention are shown, and details are as follows:
As shown in Fig. 2, first switch unit 130 includes switching tube Q1 as one embodiment of the invention.
The control terminal of switching tube Q1 is the control terminal of first switch unit 130, and the input terminal of switching tube Q1 is first switch
The input terminal of unit 130, the output end of switching tube Q1 are the output end of first switch unit 130.Further, of the invention real
It applies in example, above-mentioned switching tube Q1 is field-effect tube, and the grid of field-effect tube is the control terminal of switching tube Q1, the source electrode of field-effect tube
For the input terminal of switching tube Q1, the drain electrode of field-effect tube is the output end of switching tube Q1.In addition, above-mentioned switching tube Q1 can also be
Triode is not limited herein.
Second switch unit 140 includes photoelectrical coupler U2.The first input end of photoelectrical coupler U2 is second switch list
The input terminal of member 140, the second input end grounding of photoelectrical coupler U2, the first output end of photoelectrical coupler U2 are second switch
The output end of unit 140, the second output terminal ground connection of photoelectrical coupler U2.
Voltage regulation unit 110 includes voltage-stabiliser tube D1.The cathode of voltage-stabiliser tube D1 is the input terminal of voltage regulation unit 110, voltage-stabiliser tube D1
The just extremely output end of voltage regulation unit 110.
Bias unit 121 includes first resistor R1 and second resistance R2.
The first end of first resistor R1 is the input terminal of bias unit 121, the second end and second resistance of first resistor R1
The first end of R2 connects, and the second end ground connection of second resistance R2, the first end of second resistance R2 is the output of bias unit 121
End.Specifically, in the present embodiment, above-mentioned first resistor R1 is upper inclined resistance, second resistance R2 is lower inclined resistance.
RC charge/discharge unit 122 includes first capacitor C1 and second resistance R2.
The first end of first capacitor C1 is the input terminal of RC charge/discharge unit 122, the first end of first capacitor C1 and second
The first end of resistance R2 connects, the second end ground connection of first capacitor C1, the second end ground connection of second resistance R2.
The above-mentioned charger protection circuit based on Power over Ethernet is made furtherly below in conjunction with working principle and Fig. 2
It is bright:
In application, the charger protection circuit of above-mentioned Power over Ethernet includes three kinds of operating modes: handshake mode, normal
Powering mode and short circuit protection mode.
Handshake mode, when supply voltage VCC flows through transformer T1 to power supply chip U1, power supply chip U1 can be according to standard
Agreement and the power supply VCC for providing supply voltage carry out hand shaking, voltage of shaking hands at this time (supply voltage when shaking hands)
Pressure voltage (i.e. breakdown voltage of the supply voltage no more than voltage regulation unit) no more than voltage-stabiliser tube D1, illustratively, in this implementation
In example, above-mentioned supply voltage when shaking hands is 10V, and above-mentioned conducting voltage is 13V, thus voltage-stabiliser tube D1 do not have it is breakdown, therefore
Bias unit 121 and RC charge/discharge unit 122 are distributed without charge, and the output end of biasing charge/discharge unit 120 exports low level,
Field-effect tube Q1 grid obtains low level, persistently the conducting of holding source electrode and drain electrode, the normal work once electrified of power supply chip U1, simultaneously
The photoelectrical coupler of second switch unit 140 detects that the secondary end of transformer T1 is load supplying (i.e. transformer T1 not yet
Secondary end be low level), second switch unit 140 keeps open-circuit condition, therefore does not influence the bias unit 121 being attached thereto
With the working method of RC charge/discharge unit 122.It should be noted that operating mode of shaking hands, is to provide for good hardware loop
Border is to the charger based on Power over Ethernet and provides the front end of power supply and " shakes hands " Lifetime.Operating mode of shaking hands is needle
The standard POE Handshake Protocol time is customized, it being capable of completely compatible difference POE power supply chip.
Normal power supply mode, when the power supply VCC of power supply chip U1 and offer supply voltage shake hands successfully, power supply electricity
Pressure reaches normal power supply state, and when normal power supply, supply voltage 48V, the pressure voltage of voltage-stabiliser tube D1 is less than power supply electricity at this time
Pressure (i.e. supply voltage is greater than conducting voltage), illustratively, in the present embodiment, conducting voltage 13V, supply voltage, which subtracts, leads
Be powered pressure, and remaining voltage distributes on bias unit 121, meanwhile, voltage-stabiliser tube D1 breakdown moment, RC charge/discharge unit
First capacitor C1 in 122, theoretical and reality are all equivalent to short circuit, and therefore, biasing charge/discharge unit 120 exports low level, field
The grid of effect pipe Q1 obtains low level, persistently keeps the conducting of source electrode and drain electrode.It should be noted that at this point, first capacitor
C1 is started to charge, and the preset charged threshold values of charging voltage has to be lower than unlatching/closing operation voltage of field-effect tube, is being charged
It needs field-effect tube Q1 to continue pipe in time and protects conducting.It should be noted that the charging time of RC charge/discharge unit 122 is (according to T
=RC obtains the charging time, and the resistance value of the first electric value R1 and the capacitance product of first capacitor C1 obtain the charging time) it has to be larger than
Power supply chip U1 is to the starting of oscillation working time of transformer T1, and charging voltage is lower than field-effect tube closing motion within the charging time
Operation voltage, at this point, the output end output coupling output voltage of transformer T1.Since the output end output coupling of transformer T1 is defeated
Voltage out, therefore second switch unit must conduct, the first output end of photoelectrical coupler exports low level, bias unit 121
The low level that is exported by second switch unit 121 of second resistance R2 bypass, i.e. the output voltage of bias unit is limited in low
Level, therefore first capacitor C1 stops charging, the grid of field-effect tube Q1 continues relay acquisition low level at this time, persistently keeps source
The conducting of pole and drain electrode, power supply chip U1 continue normal work once electrified, and the output end of transformer T1 persistently exports constant output
Voltage.
Short circuit protection mode, when the charger based on Power over Ethernet, which works normally, exports constant output voltage, on
It states the charger protection circuit based on Power over Ethernet to work according to above-mentioned normal power supply mode, if above-mentioned be based on Power over Ethernet
Charger protection circuit unexpected abnormality short circuit, at this time transformer T1 output end output output voltage be low level, second
Switch unit 140 loses input voltage, stops working, at this point, the output end of second switch unit 140 is without low level output, partially
Unit 121 and RC charge/discharge unit 122 are set, the low level bypass effect of photoelectrical coupler U2 is lost, RC charge/discharge unit 122 is opened
Beginning work, over time, the charging voltage of first capacitor C1 are higher and higher, when fet gate obtains high level
When, source electrode and drain electrode truncation, power supply chip U1 stops working, that is, stops the concussion to transformer T1, so that above-mentioned be based on ether
The charger protection circuit of net power supply stops working, so that being effectively prevented from transformer is in high-temperature work environment, protects transformation
Device is not destroyed.
Charger protection circuit provided in an embodiment of the present invention based on Power over Ethernet in power supply offer by holding
When flashlight is pressed, since voltage of shaking hands is not more than the breakdown voltage of voltage regulation unit, voltage-stabiliser tube is not breakdown, biases charge and discharge list
Member output low level, so that the grid of field-effect tube is low level, so that its source electrode and drain electrode is connected and then makes power supply chip work
Make, shake hands state due at this time, there is no an output voltage, therefore second switch unit is not due to having input voltage to be not turned on,
Without low level output, when the power supply of power supply chip and offer supply voltage is shaken hands successfully, supply voltage is greater than pressure stabilizing list
The breakdown voltage of member, therefore voltage regulation unit is connected, and exports voltage of voltage regulation to bias unit, due to voltage regulation unit breakdown wink
Between, first capacitor is practical and is theoretically all equivalent to short circuit, therefore biases charge/discharge unit and still export low level so that field is imitated
Should the grid of pipe be in low level, source electrode and drain electrode conducting, so that power supply chip continues working, when transformer normally exports coupling
Output voltage is closed to when loading, the conducting of second switch unit exports low level, so that biasing charge/discharge unit exports low level,
And then field-effect tube is connected, so that the power supply chip continues working, it is defeated that the secondary end of the transformer continues output coupling
Voltage out, when the charger based on Power over Ethernet protects short circuit, the secondary end of the transformer exports low level, makes
It obtains second switch unit and no longer exports low level, the bypass of bias unit and RC charge/discharge unit due to losing second switch unit
Effect, the first capacitor of RC charge/discharge unit starts to charge, when the charging voltage of first capacitor reaches preset charged threshold value, field
When the grid of effect pipe is in high level, source electrode and drain electrode truncation, therefore power supply chip stops working, and then stops output shake
Signal is swung to transformer, so that transformer stops working so that the above-mentioned charger protection circuit based on Power over Ethernet stops work
Make.To be effectively prevented from transformer and power supply chip is in high-temperature work environment, transformer and power supply chip is protected not to be damaged
It ruins, circuit structure is simple, and it is convenient to realize.
The embodiment of the invention also provides a kind of charger based on Power over Ethernet, including power supply chip and transformer,
Transformer first input end is connect with the power supply for providing supply voltage, and the second input terminal and power supply chip of transformer connect
Connect, the above-mentioned charger based on Power over Ethernet further include it is above-mentioned based on Power over Ethernet charger protection circuit, based on
The charger protection circuit for netting very much power supply is connect with transformer and power supply chip respectively.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (8)
1. a kind of charger based on Power over Ethernet protects circuit, which is characterized in that the power supply based on Power over Ethernet
Device protection circuit include:
Voltage regulation unit, biasing charge/discharge unit, first switch unit and second switch unit；
The input terminal of the voltage regulation unit is connect with the power supply for providing supply voltage, the output end of the voltage regulation unit and institute
State the input terminal connection of biasing charge/discharge unit, the control of the output end and the first switch unit of the biasing charge/discharge unit
End connection processed, the input terminal of the first switch unit are connect with transformer, the output end and power supply of the first switch unit
Chip connection, the input terminal of the second switch unit are connect with the secondary end of the transformer, the second switch unit
Output end is connect with the biasing charge/discharge unit；
When the power supply, which starts to provide, shakes hands voltage, while when the power supply starts as the transformer-supplied,
The voltage of shaking hands is not more than the breakdown voltage of the voltage regulation unit, i.e., the described voltage regulation unit is not breakdown, the biasing charge and discharge
Electric unit power loss does not work, and keeps low level output so that the first switch unit is connected, and then obtains the power supply chip
It establishes by cable and begins to carry out work of shaking hands according to professional standard and the power supply, the transformer does not obtain the shake of the power supply chip
Signal is swung because without output coupling output voltage, the second switch unit is not turned on, and no level controling signal exports, i.e., without side
Road effect；
When the power supply chip and the power supply are shaken hands successfully, the supply voltage restores professional standard and is greater than described
The breakdown voltage of voltage regulation unit, i.e., the described voltage regulation unit is breakdown, when the voltage regulation unit is breakdown, the biasing charge and discharge list
Member originate the electric stage is equivalent to short circuit, relay exports low level so that the first switch unit remains on, into
And so that the power supply chip is continued work once electrified and export oscillator signal to the transformer, the transformer obtains the concussion
Signal starts output coupling output voltage；
When the secondary end output coupling output voltage of the transformer is to when loading, the second switch unit must be conducted, defeated
Level controling signal is so that the biasing charge/discharge unit is bypassed, even if the biasing charge/discharge unit persistently keeps low electricity out
It puts down so that first switch unit conducting, so that the power supply chip works, the secondary end of the transformer persistently exports coupling
Close output voltage；
When short circuit occurs for the charger output based on Power over Ethernet, the secondary end of the transformer is short-circuited into low electricity
Flat, the second switch unit power loss is not turned on, and no level controling signal output, the biasing charge/discharge unit loses bypass and makees
With so start to charge, when it is described biasing charge/discharge unit charging voltage reach preset charged threshold value when, the first switch
Unit truncation so that the power supply chip power loss stops working, and then stops exporting the oscillator signal to the transformer, with
The transformer is set to stop working.
2. the charger according to claim 1 based on Power over Ethernet protects circuit, which is characterized in that the biasing is filled
Discharge cell includes: bias unit and RC charge/discharge unit；
The bias unit is connect with the RC charge/discharge unit, and the input terminal and output end of the bias unit are respectively described
The input terminal and output end of charge/discharge unit are biased, the input terminal of the RC charge/discharge unit is defeated with the second switch unit
Outlet connection；
When the power supply, which starts to provide, shakes hands voltage, while when the power supply starts as the transformer-supplied,
For the voltage of shaking hands no more than the voltage regulation unit breakdown voltage, i.e., the described voltage regulation unit is not breakdown, the bias unit and
The RC charge/discharge unit power loss does not work, and keeps low level output so that the first switch unit is persistently held on, into
And making the power supply chip work once electrified, the transformer does not obtain the oscillator signal of the power supply chip because without output coupling
Output voltage, the second switch unit are not turned on, no level controling signal output；
When the power supply chip and the power supply are shaken hands successfully, the supply voltage is greater than the breakdown of the voltage regulation unit
Voltage, i.e., the described voltage regulation unit is breakdown, and output voltage of voltage regulation is to the bias unit, when the voltage regulation unit is breakdown, institute
State RC charge/discharge unit originate the electric stage is equivalent to short circuit, the RC charge/discharge unit relay exports low level, when relay
Between need be greater than the power supply chip work generate shake required for the time so that the first switch unit be connected, in turn
So that the power supply chip is continued work once electrified, and export oscillator signal to the transformer, the transformer obtains the concussion
Signal starts output coupling output voltage；
When the secondary end output coupling output voltage of the transformer is to when loading, the second switch unit must be conducted, defeated
Level controling signal is so that the bias unit and the RC charge/discharge unit are bypassed into low level, even if the biasing is single out
Member persistently keeps low level so that the first switch unit is persistently held on, so that the power supply chip persistently keeps work
Make, the secondary end of the transformer continues output coupling output voltage；
When short circuit occurs for the charger output based on Power over Ethernet, the secondary end of the transformer is short-circuited into low electricity
Flat, the second switch unit is not turned on, and no level controling signal output, the bias unit and RC charge/discharge unit be not other
Road, RC charge/discharge unit start to charge, and fill when the charging voltage of the RC charge/discharge unit reaches the default of first switch unit
When electric threshold value, the first switch unit truncation so that the power supply chip power loss stops working, and then stops exporting the shake
Signal is swung to the transformer, so that the transformer stops working.
3. the charger according to claim 1 based on Power over Ethernet protects circuit, which is characterized in that described first opens
Closing unit includes switching tube；
The control terminal of the switching tube is the control terminal of the first switch unit, and the input terminal of the switching tube is described first
The input terminal of switch unit, the output end of the switching tube are the output end of the first switch unit.
4. the charger according to claim 1 based on Power over Ethernet protects circuit, which is characterized in that described second opens
Closing unit includes photoelectrical coupler；
The first input end of the photoelectrical coupler be the second switch unit input terminal, the second of the photoelectrical coupler
Input end grounding, the first output end of the photoelectrical coupler are the output end of the second switch unit, the photoelectric coupling
The second output terminal of device is grounded.
5. the charger according to claim 1 based on Power over Ethernet protects circuit, which is characterized in that the pressure stabilizing list
Member includes voltage-stabiliser tube；
The cathode of the voltage-stabiliser tube be the voltage regulation unit input terminal, the just extremely described voltage regulation unit of the voltage-stabiliser tube it is defeated
Outlet.
6. the charger according to claim 2 based on Power over Ethernet protects circuit, which is characterized in that the biasing is single
Member includes first resistor and second resistance；
The first end of the first resistor is the input terminal of the bias unit, the second end of the first resistor and described second
The first end of resistance connects, and the second end ground connection of the second resistance, the first end of the second resistance is the bias unit
Output end.
7. the charger according to claim 2 based on Power over Ethernet protects circuit, which is characterized in that the RC charge and discharge
Electric unit includes first capacitor and second resistance；
The first end of the first capacitor be the RC charge/discharge unit input terminal, the first end of the first capacitor with it is described
The first end of second resistance connects, the second end ground connection of the first capacitor, the second end ground connection of the second resistance.
8. a kind of charger based on Power over Ethernet, including power supply chip and transformer, the transformer first input end with
The power supply connection of supply voltage is provided, the second input terminal of the transformer is connect with the power supply chip, and feature exists
In the charger based on Power over Ethernet further includes as claimed in any one of claims 1 to 7 based on Power over Ethernet
Charger protect circuit, it is described based on Power over Ethernet charger protection circuit respectively with the transformer and the power supply
Chip connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710438389.1A CN107147080B (en) | 2017-06-12 | 2017-06-12 | A kind of charger and its protection circuit based on Power over Ethernet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710438389.1A CN107147080B (en) | 2017-06-12 | 2017-06-12 | A kind of charger and its protection circuit based on Power over Ethernet |
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| CN107147080A CN107147080A (en) | 2017-09-08 |
| CN107147080B true CN107147080B (en) | 2019-04-19 |
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| CN201710438389.1A Active CN107147080B (en) | 2017-06-12 | 2017-06-12 | A kind of charger and its protection circuit based on Power over Ethernet |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217255B (en) * | 2018-11-13 | 2023-09-01 | 柳州辰天科技有限责任公司 | Relay power supply method of phase failure protector of switch machine and relay power supply control module thereof |
| CN110281787B (en) * | 2019-06-26 | 2024-04-12 | 深圳智链物联科技有限公司 | Wireless charging equipment and protection circuit thereof |
| CN112165340B (en) * | 2020-10-23 | 2025-04-04 | 杭州海康汽车软件有限公司 | Information sending device, information receiving device and information transmission system |
| CN113872774B (en) * | 2021-09-06 | 2023-10-24 | 波达通信设备（广州）有限公司 | POE power supply control circuit and power supply method |
| CN115459431A (en) * | 2022-07-29 | 2022-12-09 | 四川天邑康和通信股份有限公司 | Universal PoE power supply system for switch |
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| CN102074998A (en) * | 2009-11-19 | 2011-05-25 | 国基电子（上海）有限公司 | Protection circuit and Ethernet electrical equipment |
| CN102497276A (en) * | 2011-12-20 | 2012-06-13 | 青岛海信网络科技股份有限公司 | Power source conversion circuit and network camera with same |
| CN105703618A (en) * | 2016-03-05 | 2016-06-22 | 上海斐讯数据通信技术有限公司 | Circuit for realizing large-power power supply by using routine POE and implementation method |
| CN205921601U (en) * | 2016-06-29 | 2017-02-01 | 杭州士兰微电子股份有限公司 | Ethernet power supply system and control circuit thereof |
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| CN102074998A (en) * | 2009-11-19 | 2011-05-25 | 国基电子（上海）有限公司 | Protection circuit and Ethernet electrical equipment |
| CN102497276A (en) * | 2011-12-20 | 2012-06-13 | 青岛海信网络科技股份有限公司 | Power source conversion circuit and network camera with same |
| CN105703618A (en) * | 2016-03-05 | 2016-06-22 | 上海斐讯数据通信技术有限公司 | Circuit for realizing large-power power supply by using routine POE and implementation method |
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| CN107147080A (en) | 2017-09-08 |
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