CN105870876A - Short-circuit protection circuit and system - Google Patents
Short-circuit protection circuit and system Download PDFInfo
- Publication number
- CN105870876A CN105870876A CN201610343951.8A CN201610343951A CN105870876A CN 105870876 A CN105870876 A CN 105870876A CN 201610343951 A CN201610343951 A CN 201610343951A CN 105870876 A CN105870876 A CN 105870876A
- Authority
- CN
- China
- Prior art keywords
- feeder ear
- electrically connected
- short
- resistance
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
Abstract
The invention discloses a short-circuit protection circuit. The short-circuit protection circuit comprises a detection module and a control module, wherein the detection module is used for detecting input voltage of a load end, and the control module is used for comparing input voltage for detection with reference voltage and judging whether the connection between the load end and a power supply end is broken according to comparative result signals; the control module is further used for locking the disconnection state of the load end and the power supply end when the connection between the load end and the power supply end is broken. The invention further discloses a short-circuit protection system. According to the short-circuit protection system, when the system is detected to be short-circuited, the protection circuit can be triggered timely, the protection circuit and system have a protection locking function, the circuit is simple and reliable, and the cost is low.
Description
Technical field
The present invention relates to technical field of electronic communication, more particularly, it relates to a kind of short-circuit protection circuit and
System.
Background technology
Short-circuit protection is one of protective measure important in all kinds of circuit, when short trouble occurs in Circuits System
Time, short-circuit protection circuit can starting protection the most in time, after short trouble is got rid of, system can from
Dynamic de-preservation state, is to evaluate system reliability, safety and intelligent key factor.Existing
It is the most complicated to there is circuit in short-circuit protection circuit, and reliability is low, and cost is high, and protection mechanism can not persistently have
Effect.
Therefore, it is badly in need of providing a kind of follow-on short-circuit protection circuit and system to overcome drawbacks described above.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of short-circuit protection circuit, its circuit is simple and reliable,
With low cost.
Another object of the present invention is to provide a kind of short circuit protection system, its circuit is simple and reliable, cost
Cheap.
In order to achieve the above object, the following technical scheme of an embodiment of the present invention offer:
A kind of short-circuit protection circuit, including:
Detecting module, for detecting the input voltage of load end；
Control module, for comparing described input voltage with reference voltage, and according to comparative result
Signal judges whether to disconnect the connection between described load end and feeder ear；
Wherein, described control module is additionally operable in the separated company controlling described load end and described feeder ear
When connecing, lock the off-state of described load end and described feeder ear.
Preferably, when described feeder ear re-powers, described control module unlocks described load end
Off-state with described feeder ear.
Preferably, described control module includes:
Sluggish comparing unit, for relatively described input voltage and described reference voltage, and locks output
Comparative result signal；
Switch element, for selecting to be switched on or off described load end according to described comparative result signal
And the connection between described feeder ear.
Preferably, described sluggish comparing unit includes:
Comparator, including positive input, reverse input end and outfan, described reverse input end is used for
It is electrically connected to described detecting module；
First resistance, one end is electrically connected to described feeder ear, and the other end is just being electrically connected to described comparator
To input；
Second resistance, one end is electrically connected to the positive input of described comparator, other end ground connection；
3rd resistance, one end is electrically connected to the outfan of described comparator；
4th resistance, one end is electrically connected to the other end of described 3rd resistance, other end ground connection；And
First electrical switch, including the first end, the second end and control end, described control end is electrically connected to institute
Stating one end of the 4th resistance, described first end is electrically connected to the reverse input end of described comparator, and described
Two end ground connection.
Preferably, described switch element includes:
5th resistance, one end is electrically connected to described sluggish comparing unit；
Second electrical switch, including the first end, the second end and control end, described control end is electrically connected to institute
Stating the other end of the 5th resistance, described first end is electrically connected to described feeder ear, described second end electrical connection
In described load end.
Preferably, described short-circuit protection circuit also includes trigger control module, for receiving triggering letter
Number time produce and export control signal to disconnect the connection between described load end and described feeder ear.
In order to achieve the above object, the following technical scheme of another embodiment of present invention offer:
A kind of short circuit protection system, including:
Feeder ear；
Load end；
Handover module, is electrically connected between described feeder ear and described load end；
Control module, is electrically connected to described handover module, is used for detecting described feeder ear and described switching mould
The voltage of the junction point of block, and judge whether that controlling described handover module disconnects described according to described voltage
Feeder ear and the connection of described load end；And
Trigger control module, is electrically connected to described handover module, for the output when receiving triggering signal
Control signal controls described handover module and disconnects the connection of described feeder ear and described load end；
Wherein, described control module is additionally operable in the separated company controlling described load end and described feeder ear
When connecing, lock the off-state of described load end and described feeder ear.
The short-circuit protection circuit of application present invention offer and system, it is when the system of detecting is short-circuited,
Circuit can be cut off by software or two kinds of control modes of hardware, carry out circuit protection, and there is protection
Lock function.
From the foregoing, it will be observed that use short-circuit protection circuit and the system of the application offer, can be by software or hard
Two kinds of control modes of part cut off circuit, carry out circuit protection, and have protection lock function, circuit letter
Single reliable, with low cost.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art,
On the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The functional block diagram of the short-circuit protection circuit that Fig. 1 provides for one embodiment of the invention；
The module map of the short-circuit protection circuit that Fig. 2 provides for another embodiment of the present invention；
The circuit diagram of the short circuit protection system that Fig. 3 provides for one embodiment of the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention, and
It is not all, of embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under creative work premise, broadly fall into the scope of protection of the invention.
The module map of the short-circuit protection circuit that Fig. 1 provides for an embodiment of the present invention.Short-circuit protection circuit
10 are used for when detecting Circuits System and being short-circuited, and cut off the connection of feeder ear 20 and load end 30,
Thus protect the load end 30 will not be damaged.In the present embodiment, short-circuit protection circuit 10 includes
Detecting module 1 and control module 2.Detecting module 1 is for detecting the input voltage of load end 30, specifically
Can be the voltage connecting a certain location point of detecting feeder ear 20 and load end 30.Control module 2 is used
In the input voltage that detecting module 1 detects is compared with reference voltage, and believe according to comparative result
Number judge whether the connection between disconnecting consumers end 30 and feeder ear 20.In an embodiment of the present invention
In, control module 2 determine input voltage less than reference voltage time, disconnecting consumers end 30 and feeder ear
Connection between 20, can also set input according to side circuit the most in other embodiments
When voltage is more than reference voltage, the connection between disconnecting consumers end 30 and feeder ear 20.
It should be noted that in order to avoid repetitive control logic occurs, occur repeatedly disconnecting or not turning off negative
Carrying the connection between end 30 and feeder ear 20, control module 2 is additionally operable at load end 30 and feeder ear 20
Between when disconnecting, the off-state of locking load end 30 and feeder ear 20, so that short circuit is protected
Protection circuit 10 is once detect electric voltage exception, and short-circuit protection circuit 10 will control to cut off load end 30
And the connection between feeder ear 20, and dissengaged positions can be maintained, even if hereafter voltage recovers normal, load
It is also at off-state between end 30 and feeder ear 20, when needs exit protection mechanism, feeder ear 20
Can recover after re-powering.
Please refer to Fig. 2, in an embodiment of the present invention, control module 2 includes sluggish comparing unit
20 and switch element 22.Sluggish comparing unit 20 is for comparing the input voltage that detecting module 1 detects
With reference voltage, and lock the comparative result signal of output.Switch element 22 is for more single according to sluggishness
The comparative result signal of unit 20 output selects to be switched on or off between load end 30 and feeder ear 20
Connect.
As to further improvement of the present invention, short-circuit protection circuit 10 also includes trigger control module 3,
Trigger control module 3 carrys out disconnecting consumers end for producing and export control signal when receiving triggering signal
Connection between 30 and feeder ear 20.In the present embodiment, trigger control module 3 can be the most defeated
Go out control signal, trigger signal and can input generation at any time by user, thus realization can be according to reality
Border needs at any time can connection between disconnecting consumers end 30 and feeder ear 20.
The circuit diagram of the short circuit protection system that Fig. 3 provides for an embodiment of the present invention.In present embodiment
In, short circuit protection system 100 includes short-circuit protection circuit 10, feeder ear 20 and load end 30.Short circuit
Protection circuit 10 includes detecting module 1, control module 2, trigger control module 3.Detecting module 1 includes
First resistance R1, one end of the first resistance R1 is electrically connected to the common port of feeder ear 20 and load end 30.
Control module 2 includes sluggish comparing unit 20 and switch element 22.Sluggish comparing unit 20 includes comparing
Device OP1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance
R6, the 7th resistance R7, electric capacity C1 and the first electrical switch Q1.Comparator OP1 includes that forward inputs
End, reverse input end and outfan, the reverse input end of comparator OP1 is electrically connected to the first resistance R1
The other end.One end of second resistance R2 is electrically connected to feeder ear 20, the other end electricity of the second resistance R2
It is connected to the positive input of comparator OP1.One end of 3rd resistance R3 is electrically connected to described comparator
Positive input, the other end ground connection of the 3rd resistance R3.One end of 4th resistance R4 is electrically connected to ratio
The relatively reverse input end of device OP1, the other end ground connection of the 4th resistance R4.One end electricity of the 5th resistance R5
It is connected to the outfan of comparator OP1.One end of 6th resistance R6 is electrically connected to the another of the 5th resistance R5
One end, the other end ground connection of the 6th resistance R6.One end of 7th resistance R7 is electrically connected to the 5th resistance R5
Common port with the 6th resistance R6.First electrical switch Q1 includes the first end, the second end and controls end,
The end that controls of the first electrical switch Q1 is electrically connected to the other end of the 7th resistance R7, the first electrical switch Q1
The first end be electrically connected to the reverse input end of comparator OP1, second termination of the first electrical switch Q1
Ground.In the present embodiment, the first electrical switch Q1 can be NPN audion.At its of the present invention
In his embodiment, sluggish comparing unit 20 can also use other circuit structures, such as can omit the
Four resistance R4, the 7th resistance R7 also can realize roughly the same function.
Switch element 22 includes the 8th resistance R8 and the second electrical switch Q2.One end of 8th resistance R8
It is electrically connected to the outfan of comparator OP1.Second electrical switch Q2 includes the first end, the second end and control
End processed, the end that controls of the second electrical switch Q2 is electrically connected to the other end of described 8th resistance R8, and second
First end of electrical switch Q2 is electrically connected to feeder ear 20, the second end electrical connection of the second electrical switch Q2
In load end 30.In the present embodiment, the second electrical switch Q2 can be P-channel metal-oxide-semiconductor.When
When the control end of the second electrical switch Q2 is high level, the second electrical switch Q2 cut-off, and then disconnect confession
Electricity end 20 and the connection of load end 30.
Trigger control module 3 is electrically connected to one end of the 8th resistance R8, is used for exporting control signal and controls
Second electrical switch Q2.Defeated with comparator OP1 in order to isolate the control signal of trigger control module 3 output
The signal gone out, sluggish comparing unit 20 also includes that diode D1, the positive electrical of diode D1 are connected to ratio
The relatively outfan of device OP1, the negative electricity of diode D1 is connected to trigger control module 3 and the 8th resistance
The common port of R8.In the present embodiment, the chip during trigger control module 3 can use product own
Realize function, can be cost-effective.
It should be noted that can be adjusted by the resistance adjusting the second resistance R2 and the 3rd resistance R3
The size of reference voltage, when short circuit protection system 100 is short-circuited, the reverse input of comparator OP1
Terminal voltage reduces, and now the output voltage of comparator OP1 is become high level from low level, and then makes the
Two electrical switch Q2 cut-offs, disconnect the connection of feeder ear 20 and load end 30.First electrical switch simultaneously
Q1 turns on, and the reverse input end of comparator OP1 is persistently kept to electronegative potential, so that the second electronics
The cut-off state of switch Q2 is locked, and could recover after needing to re-power.
The short-circuit protection circuit of above-described embodiment offer and system, when the system of detecting is short-circuited, can
To cut off circuit by software or two kinds of control modes of hardware, carry out circuit protection, and there is protection lock
Determining function, circuit is simple and reliable, with low cost.
In this specification, each embodiment uses the mode gone forward one by one to describe, and each embodiment stresses
Being the difference with other embodiments, between each embodiment, identical similar portion sees mutually.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses
The present invention.Multiple amendment to these embodiments will be aobvious and easy for those skilled in the art
See, generic principles defined herein can without departing from the spirit or scope of the present invention,
Realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein,
And it is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (7)
1. a short-circuit protection circuit, it is characterised in that including:
Detecting module, for detecting the input voltage of load end；
Control module, for comparing described input voltage with reference voltage, and according to comparative result
Signal judges whether to disconnect the connection between described load end and feeder ear；
Wherein, described control module is additionally operable in the connection disconnected between described load end and described feeder ear
Time, lock the off-state of described load end and described feeder ear.
Short-circuit protection circuit the most according to claim 1, it is characterised in that when described feeder ear weight
When newly powering on, described control module unlocks the off-state of described load end and described feeder ear.
Short-circuit protection circuit the most according to claim 1, it is characterised in that described control module bag
Include:
Sluggish comparing unit, for relatively described input voltage and described reference voltage, and locks output
Comparative result signal；
Switch element, for selecting to be switched on or off described load end according to described comparative result signal
And the connection between described feeder ear.
Short-circuit protection circuit the most according to claim 3, it is characterised in that described sluggishness is more single
Unit includes:
Comparator, including positive input, reverse input end and outfan, described reverse input end is used for
It is electrically connected to described detecting module；
First resistance, one end is electrically connected to described feeder ear, and the other end is just being electrically connected to described comparator
To input；
Second resistance, one end is electrically connected to the positive input of described comparator, other end ground connection；
3rd resistance, one end is electrically connected to the outfan of described comparator；
4th resistance, one end is electrically connected to the other end of described 3rd resistance, other end ground connection；And
First electrical switch, including the first end, the second end and control end, described control end is electrically connected to institute
Stating one end of the 4th resistance, described first end is electrically connected to the reverse input end of described comparator, and described
Two end ground connection.
Short-circuit protection circuit the most according to claim 3, it is characterised in that described switch element bag
Include:
5th resistance, one end is electrically connected to described sluggish comparing unit；
Second electrical switch, including the first end, the second end and control end, described control end is electrically connected to institute
Stating the other end of the 5th resistance, described first end is electrically connected to described feeder ear, described second end electrical connection
In described load end.
Short-circuit protection circuit the most according to claim 1, it is characterised in that also include triggering control
Module, for producing and export control signal to disconnect described load end and institute when receiving triggering signal
State the connection between feeder ear.
7. a short circuit protection system, it is characterised in that including:
Feeder ear；
Load end；
Handover module, is electrically connected between described feeder ear and described load end；
Control module, is electrically connected to described handover module, is used for detecting described feeder ear and described switching mould
The voltage of the junction point of block, and judge whether that controlling described handover module disconnects described according to described voltage
Feeder ear and the connection of described load end；And
Trigger control module, is electrically connected to described handover module, for the output when receiving triggering signal
Control signal controls described handover module and disconnects the connection of described feeder ear and described load end；
Wherein, described control module is additionally operable in the connection disconnected between described load end and described feeder ear
Time, lock the off-state of described load end and described feeder ear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610343951.8A CN105870876A (en) | 2016-05-23 | 2016-05-23 | Short-circuit protection circuit and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610343951.8A CN105870876A (en) | 2016-05-23 | 2016-05-23 | Short-circuit protection circuit and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105870876A true CN105870876A (en) | 2016-08-17 |
Family
ID=56635658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610343951.8A Pending CN105870876A (en) | 2016-05-23 | 2016-05-23 | Short-circuit protection circuit and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105870876A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107316598A (en) * | 2017-08-14 | 2017-11-03 | 南京中电熊猫平板显示科技有限公司 | A kind of hot plug fault control device and method |
| CN109149732A (en) * | 2017-06-28 | 2019-01-04 | 南宁富桂精密工业有限公司 | adapter |
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| CN1901343A (en) * | 2006-07-19 | 2007-01-24 | 中国科学院等离子体物理研究所 | Power convertion circuit with protective self locking function |
| CN101346865A (en) * | 2006-06-06 | 2009-01-14 | 株式会社理光 | Excess voltage protection circuit, method of protecting a circuit from excess voltage, and semiconductor apparatus having the excess voltage protection ciruit |
| CN201937236U (en) * | 2011-02-16 | 2011-08-17 | Bcd半导体制造有限公司 | Locking type short-circuit protection circuit in vehicle electronic system |
| DE102012218503A1 (en) * | 2012-10-11 | 2014-04-17 | Bayerische Motoren Werke Aktiengesellschaft | Vehicle i.e. motor car, has socket spacer attached to board voltage socket for electrical supply and comprising switching-element, and control unit for switching switching-element based on outputs of voltage comparator and value comparator |
| CN103872997A (en) * | 2012-12-15 | 2014-06-18 | 北京格瑞图科技有限公司 | Over standing-wave ratio protection circuit of power amplifier |
-
2016
- 2016-05-23 CN CN201610343951.8A patent/CN105870876A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101346865A (en) * | 2006-06-06 | 2009-01-14 | 株式会社理光 | Excess voltage protection circuit, method of protecting a circuit from excess voltage, and semiconductor apparatus having the excess voltage protection ciruit |
| CN1901343A (en) * | 2006-07-19 | 2007-01-24 | 中国科学院等离子体物理研究所 | Power convertion circuit with protective self locking function |
| CN201937236U (en) * | 2011-02-16 | 2011-08-17 | Bcd半导体制造有限公司 | Locking type short-circuit protection circuit in vehicle electronic system |
| DE102012218503A1 (en) * | 2012-10-11 | 2014-04-17 | Bayerische Motoren Werke Aktiengesellschaft | Vehicle i.e. motor car, has socket spacer attached to board voltage socket for electrical supply and comprising switching-element, and control unit for switching switching-element based on outputs of voltage comparator and value comparator |
| CN103872997A (en) * | 2012-12-15 | 2014-06-18 | 北京格瑞图科技有限公司 | Over standing-wave ratio protection circuit of power amplifier |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149732A (en) * | 2017-06-28 | 2019-01-04 | 南宁富桂精密工业有限公司 | adapter |
| CN107316598A (en) * | 2017-08-14 | 2017-11-03 | 南京中电熊猫平板显示科技有限公司 | A kind of hot plug fault control device and method |
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Application publication date: 20160817 |
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