CN109088391A - Short-circuit protection circuit and nonstandard POE charger - Google Patents
Short-circuit protection circuit and nonstandard POE charger Download PDFInfo
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- CN109088391A CN109088391A CN201811085792.1A CN201811085792A CN109088391A CN 109088391 A CN109088391 A CN 109088391A CN 201811085792 A CN201811085792 A CN 201811085792A CN 109088391 A CN109088391 A CN 109088391A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A kind of short-circuit protection circuit and nonstandard POE controller; short-circuit protection circuit includes: the first electronic switch, charging sub-circuit, the second electronic switch and resistance R5; the control terminal of second electronic switch is connect with resistance R5; resistance R5 is used to connect by resistance R4 with power input; resistance R5 is also connect with the anode of diode D1; the cathode of diode D1 with power output end for connecting; the first end of second electronic switch is connect with the control terminal of the first electronic switch, and the second end of the second electronic switch is for being grounded；Charging sub-circuit is used to connect by resistance R1 with power input, and charging sub-circuit is also connect with the control terminal of the first electronic switch；The first end of first electronic switch with power input for connecting, and the second end of the first electronic switch with power output end for connecting.Above-mentioned short-circuit protection circuit and nonstandard POE charger, when there is short circuit phenomenon in the circuit for avoiding product, the problem of being easy to cause damage of product.
Description
Technical field
The present invention relates to electronic circuit technology fields, more particularly to a kind of short-circuit protection circuit and nonstandard charger.
Background technique
POE power supply technique can existing Ethernet be routed architecture do not make any changes in the case where, for
IP-based terminal (such as IP telephone machine, wireless local network connecting point AP, web camera, network access, night watching card reader)
While transmitting data-signal, moreover it is possible to provide direct current supply for such equipment.
In practical applications, since the POE cost for realizing standard agreement is very high, on the other hand wish in some applications
It is above standard the requirement of restriction using power, these occasions need largely to use off-gauge POE product.And off-gauge POE
Product does not use the protocol integrated test system chip of standard POE product, when so that short circuit phenomenon occur, only passes through it to reduce cost
In PTC (Positive Temperature Coefficient, thermistor) go consumption power, to reduce the electricity of receiving end
Pressure, after some time, is easy to appear PTC resistor and burns out problem, lead to POE damage of product, irrecoverable, or directly adopts
With fuse mode, when there are short-circuit conditions, direct fuse wire also causes POE to damage.
Summary of the invention
Based on this, it is necessary to when there is short circuit phenomenon for the problem that nonstandard POE product, it is easy to cause POE damage of product,
A kind of short-circuit protection circuit and nonstandard POE charger are provided.
A kind of short-circuit protection circuit, comprising: the first electronic switch and ON-OFF control circuit, wherein the switch control electricity
Road includes charging sub-circuit and switch sub-circuit；The switch sub-circuit includes the second electronic switch and resistance R5, and described second
The control terminal of electronic switch is connect with the first end of the resistance R5, and the second end of the resistance R5 is used to pass through resistance R4 and institute
Power input connection is stated, the second end of the resistance R5 is also connect with the anode of diode D1, the cathode of the diode D1
For connecting with power output end, the first end of second electronic switch is connect with the control terminal of first electronic switch,
The second end of second electronic switch is for being grounded；The first end of the charging sub-circuit is used for defeated by resistance R1 and power supply
Enter end connection, the first end of the charging sub-circuit is also connect with the control terminal of first electronic switch, the charging electricity
The second end on road is for being grounded；The first end of first electronic switch with power input for connecting, first electronics
The second end of switch with power output end for connecting.
The charging sub-circuit includes concatenated capacitor C1 and resistance R3 in one of the embodiments,.
The control terminal of first electronic switch is sub with the charging respectively by resistance R2 in one of the embodiments,
The first end of circuit is connected with the first end of second electronic switch.
The control terminal of second electronic switch is also used to be grounded by resistance R6 in one of the embodiments,.
First electronic switch is metal-oxide-semiconductor in one of the embodiments,.
In one of the embodiments, first electronic switch be PMOS tube, the grid of the PMOS tube respectively with institute
It states the first end of charging sub-circuit and the first end connection of second electronic switch, the source electrode of the PMOS tube is used for and institute
Power input connection is stated, the drain electrode of the PMOS tube with the power output end for connecting.
Second electronic switch is triode in one of the embodiments,.
In one of the embodiments, second electronic switch be NPN triode, the base stage of the NPN triode with
The first end of the resistance R5 connects, and the collector of the NPN triode is connect with the control terminal of first electronic switch, institute
The emitter of NPN triode is stated for being grounded.
The cathode of the diode D1 is used to connect by inductance with power output end in one of the embodiments,.
A kind of nonstandard POE charger, including short-circuit protection circuit described in upper any embodiment.
Above-mentioned short-circuit protection circuit and nonstandard POE charger, by being arranged between power input and power output end
First electronic switch, and charging sub-circuit is respectively set and switchs sub-circuit and is connect with the control terminal of the first electronic switch, and makes
The first end of charging sub-circuit is connect by resistance R1 with power input, and switch sub-circuit is defeated by resistance R4 and the power supply
Enter end connection；In this way, after powering on, since power input does not give charging sub-circuit charging, the control terminal of the first electronic switch
The first electronic switch is connected for low level, so that being connected between power input and power output end, power output end output
Power supply；Later, on the one hand, if power output end can give equipment normal power supply, power input exports electric current and gives switch
Circuit, the conducting voltage for making the voltage of the control terminal of the second electronic switch be greater than the second electronic switch lead the second electronic switch
It is logical, the first electronic switch is connected so that the control terminal of the first electronic switch be made to continue as low level so that power input and
It is connected between power output end, power output end out-put supply, on the other hand, if the equipment end of power output end access is short
Road can make the reduction of power output end voltage, in power output end voltage drop as low as after to a certain degree, so that passing through resistance R5's
After partial pressure, the voltage of the control terminal of the second electronic switch cuts the second electronic switch less than the conducting voltage of the second electronic switch
Only, at this time power input by resistance R1 to charging sub-circuit charging, charging sub-circuit in a short period of time it is fully charged simultaneously
So that the control terminal of the first electronic switch is that high level turns off the first electronic switch, so that power input and power output end
It is separated, power output end stop out-put supply.I.e. when short circuit phenomenon occurs in the circuit of power output end connection, it can incite somebody to action
Separated, the power cutoff of power input and power output end, the circuit for avoiding the product of power output end connection occur
When short circuit phenomenon, the problem of being easy to cause damage of product.
Detailed description of the invention
Fig. 1 is the module diagram of the short-circuit protection circuit of one embodiment of the invention；
Fig. 2 is the circuit diagram of the short-circuit protection circuit of one embodiment of the invention.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair
It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not
Similar improvement is done in the case where violating intension of the present invention, therefore the present invention is not limited by the specific embodiments disclosed below.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
The present invention provides a kind of short-circuit protection circuit, as a kind of feasible embodiment, as shown in Figure 1, short-circuit protection
Circuit includes the first electronic switch 100 and ON-OFF control circuit, wherein the ON-OFF control circuit includes charging sub-circuit 200
With switch sub-circuit 300；The switch sub-circuit 300 includes the second electronic switch 310 and resistance R5, second electronic switch
310 control terminal is connect with the first end of the resistance R5, and the second end of the resistance R5 is used for through resistance R4 and the electricity
Source input terminal IN connection, the second end of the resistance R5 are also connect with the anode of diode D1, and the cathode of the diode D1 is used
It is connect in power output end OUT, the control of the first end of second electronic switch 310 and first electronic switch 100
End connection, the second end of second electronic switch 310 is for being grounded；The first end of the charging sub-circuit 200 is for passing through
Resistance R1 is connect with power input IN, control of the first end of the charging sub-circuit 200 also with first electronic switch 100
End connection processed, the second end of the charging sub-circuit 200 is for being grounded；The first end of first electronic switch 100 be used for
Power input IN connection, the second end of first electronic switch 100 with power output end OUT for connecting.
Above-mentioned short-circuit protection circuit, by the way that the first electronic cutting is arranged between power input IN and power output end OUT
100 are closed, and charging sub-circuit 200 is respectively set and switchs sub-circuit 300 and is connect with the control terminal of the first electronic switch 100, and
The first end of sub-circuit 200 of making to charge connect by resistance R1 with power input IN, switch sub-circuit 300 pass through resistance R4 and
The power input IN connection；In this way, after powering on, since power input IN does not give charging sub-circuit 200 to charge, first
The control terminal of electronic switch 100 is that the first electronic switch 100 is connected in low level, so that power input IN and power output end
It is connected between OUT, power output end OUT out-put supply；Later, on the one hand, if power output end OUT can be normal to equipment
Power supply, power input IN export electric current and give switch sub-circuit 300, are greater than the voltage of the control terminal of the second electronic switch 310
The second electronic switch 310 is connected in the conducting voltage of second electronic switch 310, to make the control terminal of the first electronic switch 100
Continuing as low level is connected the first electronic switch 100, so that being connected between power input IN and power output end OUT, electricity
Source output terminal OUT out-put supply, on the other hand, if the equipment terminal shortcircuit of power output end OUT access, can make power supply export
Hold OUT voltage to reduce, power output end OUT voltage drop as low as after to a certain degree so that after the partial pressure for passing through resistance R5,
The voltage of the control terminal of second electronic switch 310 cuts the second electronic switch 310 less than the conducting voltage of the second electronic switch 310
Only, power input IN is charged by resistance R1 to charging sub-circuit 200 at this time, and charging sub-circuit 200 is in a short period of time
Control terminal that is fully charged and making the first electronic switch 100 is that high level turns off the first electronic switch 100, so that power input
End IN's and power output end OUT is separated, and power output end OUT stops out-put supply.I.e. when power output end OUT connection
, can be by the separated of power input IN and power output end OUT when short circuit phenomenon occurs in circuit, power cutoff avoids
When there is short circuit phenomenon in the circuit of the product of power output end OUT connection, the problem of being easy to cause damage of product.
Short-circuit protection circuit is nonstandard POE for short circuit protection circuit in one of the embodiments,.Nonstandard POE power supply
Short-circuit protection circuit can be applicable in nonstandard POE charger.Power input is that POE power supply is defeated in one of the embodiments,
Enter end, power output end is POE power supply output end.
Short-circuit protection circuit in order to further illustrate the present invention, below with reference to the circuit diagram of one embodiment to the present invention
Short-circuit protection circuit be illustrated.Fig. 2 is the circuit diagram of the short-circuit protection circuit of one embodiment of the invention.
The charging sub-circuit 200 includes concatenated capacitor C1 and resistance R3 in one of the embodiments,.Due to capacitor
The charge and discharge electro ultrafiltration of C1, power input IN can charge to capacitor C1, calculate value, allow capacitor C1 in a short period of time
It is fully charged, and capacitor C1 is made to discharge to the first electronic switch 100, i.e. metal-oxide-semiconductor Q1, to change the on state of metal-oxide-semiconductor Q1.
In order to protect the first electronic switch, the control terminal of first electronic switch 100 is logical in one of the embodiments,
Resistance R2 is crossed to connect with the first end of the first end of the charging sub-circuit 200 and second electronic switch 310 respectively.This
Sample is acted on by the partial pressure of resistance R2, protects to the first electronic switching tube 100, prevent the first electronic switching tube 100 from being hit
It wears.
First electronic switch is metal-oxide-semiconductor in one of the embodiments,.Metal-oxide-semiconductor is voltage control device, by filling
Electronic circuit 200 and switch sub-circuit 300 control the voltage of metal-oxide-semiconductor, and can to control respectively two kinds of the turn-on and turn-off of metal-oxide-semiconductor different
State, to control two kinds of different conditions of turn-on and turn-off between power input IN and power output end OUT.And metal-oxide-semiconductor category
In voltage control device, the partial pressure effect of resistance R2 will not influence the switch state of metal-oxide-semiconductor.
Further, first electronic switch 100 is PMOS tube Q1, and the grid of the PMOS tube Q1 is filled with described respectively
The first end of electronic circuit 100 and the connection of the first end of second electronic switch 310, the source electrode of the PMOS tube Q1 are used for
It is connect with the power input IN, the drain electrode of the PMOS tube Q1 with the power output end OUT for connecting.PMOS tube Q1
Be connected when its grid is low level, turn off when being high level, drawn high the grid of PMOS tube Q1 by charging sub-circuit 200
, so that power input IN and power output end OUT's is separated, electricity is prevented so that PMOS tube Q1 is turned off for high level
Source input terminal IN continues to be powered product, protects to product.
In order to protect the second electronic switch, the control terminal of second electronic switch is also used in one of the embodiments,
It is grounded in by resistance R6.In this way, being acted on by the partial pressure of resistance R6, the second electronic switching tube 310 is protected, prevents the
Two electronic switching tubes 310 are breakdown.
Second electronic switch 310 is triode in one of the embodiments,.Triode is current control device,
Low-voltage is provided when providing high voltage and equipment terminal shortcircuit when equipment end is normal by power input IN can control three respectively
The base voltage of pole pipe, and then change and flow through the electric current of base stage to control two kinds of different conditions of turn-on and turn-off, thus control the
Two kinds of different conditions of turn-on and turn-off between one electronic switch 100 and ground terminal, to control the control terminal of the first electronic switch 100
Whether it is grounded.
Further, second electronic switch 310 be NPN triode Q2, the base stage of the NPN triode Q2 with it is described
The first end of resistance R5 connects, and the collector of the NPN triode Q2 is connect with the control terminal of first electronic switch 100,
The emitter of the NPN triode Q2 is for being grounded.Triode Q2's is connected when its base voltage is greater than conducting voltage, is less than
It turns off when conducting voltage, by dragging down the base voltage of triode Q2 less than conducting voltage when power output end OUT short circuit, makes
Triode Q2 shutdown prevents ground terminal by the first electronic cutting so that the first electronic switch 100 and ground terminal is separated
The control terminal voltage pull-down for closing 100 avoids the conducting of the first electronic switch 100 from continuing to be powered product, leads to damage of product.
In order to give power output end to provide stable DC source, the diode D1 in one of the embodiments,
Cathode is used to connect by inductance with power output end.By the effect of inductance, stable DC is provided to power output end
Source.
In one of the embodiments, the grid of the PMOS tube Q1 by resistance R2 respectively with the concatenated capacitor C1
It is connected with the collector of the first end of resistance R3 and the NPN triode Q2, the source electrode of the PMOS tube is used for and the electricity
Source input terminal IN connection, the drain electrode of the PMOS tube for being connect with the power output end PUT, the concatenated capacitor C1 and
The second end of resistance R3 is for being grounded, and the emitter of the NPN triode Q2 is for being grounded, the base stage of the NPN triode Q2
It is connect with the first end of the resistance R5, the second end of the resistance R5 is connect by resistance R4 with power input IN, described
The second end of resistance R5 also passes through diode D1 and connect with power output end OUT, and the power input IN also passes through resistance R1
It is connect with the grid of PMOS tube Q1.
The present invention also provides a kind of nonstandard POE charger, the nonstandard POE charger includes described in any embodiment as above
Short-circuit protection circuit.
Above-mentioned nonstandard POE charger, i.e., when short circuit phenomenon occurs in the circuit of the product of nonstandard POE charger connection, energy
Enough separated, power cutoffs by power input and power output end avoid the electricity of the product of nonstandard POE charger connection
When there is short circuit phenomenon in road, the problem of being easy to cause damage of product.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of short-circuit protection circuit characterized by comprising the first electronic switch and ON-OFF control circuit, wherein described to open
Closing control circuit includes charging sub-circuit and switch sub-circuit；The switch sub-circuit includes the second electronic switch and resistance R5,
The control terminal of second electronic switch is connect with the first end of the resistance R5, and the second end of the resistance R5 is for passing through electricity
Resistance R4 is connect with the power input, and the second end of the resistance R5 is also connect with the anode of diode D1, the diode
The cathode of D1 with power output end for connecting, the control of the first end of second electronic switch and first electronic switch
End connection, the second end of second electronic switch is for being grounded；
The first end of the charging sub-circuit is used to connect by resistance R1 with power input, and the first of the charging sub-circuit
End is also connect with the control terminal of first electronic switch, and the second end of the charging sub-circuit is for being grounded；
For connecting with power input, the second end of first electronic switch is used for the first end of first electronic switch
It is connect with power output end.
2. short-circuit protection circuit according to claim 1, which is characterized in that the charging sub-circuit includes concatenated capacitor
C1 and resistance R3.
3. short-circuit protection circuit according to claim 1, which is characterized in that the control terminal of first electronic switch passes through
Resistance R2 is connect with the first end of the first end of the charging sub-circuit and second electronic switch respectively.
4. short-circuit protection circuit according to claim 1, which is characterized in that the control terminal of second electronic switch is also used
It is grounded in by resistance R6.
5. short-circuit protection circuit according to claim 1, which is characterized in that first electronic switch is metal-oxide-semiconductor.
6. short-circuit protection circuit according to claim 5, which is characterized in that first electronic switch is PMOS tube, institute
The grid for stating PMOS tube is connect with the first end of the first end of the charging sub-circuit and second electronic switch respectively, institute
The source electrode of PMOS tube is stated for connecting with the power input, the drain electrode of the PMOS tube with the power output end for connecting
It connects.
7. short-circuit protection circuit according to claim 1, which is characterized in that second electronic switch is triode.
8. short-circuit protection circuit according to claim 7, which is characterized in that second electronic switch is NPN triode,
The base stage of the NPN triode is connect with the first end of the resistance R5, the collector of the NPN triode and first electricity
The control terminal of sub switch connects, and the emitter of the NPN triode is for being grounded.
9. short-circuit protection circuit according to claim 1, which is characterized in that the cathode of the diode D1 is for passing through electricity
Sense is connect with power output end.
10. a kind of nonstandard POE charger, which is characterized in that including short-circuit protection as claimed in any one of claims 1-9 wherein
Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811085792.1A CN109088391B (en) | 2018-09-18 | 2018-09-18 | Short-circuit protection circuit and nonstandard POE power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811085792.1A CN109088391B (en) | 2018-09-18 | 2018-09-18 | Short-circuit protection circuit and nonstandard POE power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109088391A true CN109088391A (en) | 2018-12-25 |
| CN109088391B CN109088391B (en) | 2023-10-17 |
Family
ID=64841962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811085792.1A Active CN109088391B (en) | 2018-09-18 | 2018-09-18 | Short-circuit protection circuit and nonstandard POE power supply |
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| Country | Link |
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| CN207603264U (en) * | 2017-12-15 | 2018-07-10 | 歌尔科技有限公司 | A kind of esd protection circuit inside battery charger |
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| WO2008001644A1 (en) * | 2006-06-27 | 2008-01-03 | Panasonic Electric Works Co., Ltd. | Polarity switching circuit and feeding unit |
| CN102487195A (en) * | 2010-12-03 | 2012-06-06 | 上海博泰悦臻电子设备制造有限公司 | Reversed polarity protection circuit of power supply |
| CN202042887U (en) * | 2011-05-03 | 2011-11-16 | 深圳Tcl新技术有限公司 | Charging input overvoltage protecting circuit |
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| CN207603264U (en) * | 2017-12-15 | 2018-07-10 | 歌尔科技有限公司 | A kind of esd protection circuit inside battery charger |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109088391B (en) | 2023-10-17 |
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