CN109449876A - A kind of short-circuit protection circuit - Google Patents
A kind of short-circuit protection circuit Download PDFInfo
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- CN109449876A CN109449876A CN201811404401.8A CN201811404401A CN109449876A CN 109449876 A CN109449876 A CN 109449876A CN 201811404401 A CN201811404401 A CN 201811404401A CN 109449876 A CN109449876 A CN 109449876A
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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
Abstract
The invention belongs to electronic circuit technology fields, provide a kind of short-circuit protection circuit, including the first division module, the second division module, control chip, comparison module, power resistor and switch module；The first end of power resistor connects to power supply, power resistor second end is connect with the first division module first end and switch module first end respectively, first division module second end is connect with comparison module first input end, first division module third end ground connection, second division module first end is connect with the power supply, second division module second end is connect with second input terminal of comparison module, second division module third end ground connection, the output end of the comparison module is connect with the input terminal of the control chip, the output end of control chip is connect with the second end of the switch module, the third end of switch module and load connect.It can stop power supply in load short circuits, prevent the damage of electronic device in power supply and load, structure is simply easily achieved, and has saved cost.
Description
Technical field
The invention belongs to electronic circuit technology field more particularly to a kind of short-circuit protection circuits.
Background technique
In power supply powering load, when the short circuit occurred inside of load, electronic component or power supply in load will cause
Damage, it is also possible to safety accident can be caused.
Currently, mainly realizing that short-circuit protection mode is using fuse, when current is excessive, fuse is just automatic to fuse.
This short-circuit protection circuit, needs to frequently replace fuse, circuit maintenance higher cost, and troublesome in poeration, and in addition fuse is molten
It is disconnected to need a period of time, it is possible to fuse also no fusing occur when electric current is excessive, what the device in load had been burned out
Situation.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of short-circuit protection circuit, it is intended to solve existing protection circuit cost
Higher, complicated for operation problem.
The first aspect of the embodiment of the present invention provides a kind of short-circuit protection circuit, and the short-circuit protection circuit includes first point
Die block, the second division module, control chip, comparison module, power resistor and switch module；
The first end of the power resistor connects to power supply, and the second end of the power resistor is divided with described first respectively
The first end of module is connected with the first end of the switch module, the second end of first division module and the comparison module
First input end connection, first division module third end ground connection, the first end of second division module with it is described
Power supply connection, the second end of second division module are connect with the second input terminal of the comparison module, second partial pressure
The third end of module is grounded, and the output end of the comparison module is connect with the input terminal of the control chip, the control chip
Output end connect with the second end of the switch module, the third end of the switch module and load connect；Wherein, described
The resistance value for the divider resistance that one division module includes is greater than the resistance value for the divider resistance that second division module includes；
When load short circuits, the voltage of the comparison module first input end is less than the electricity of the comparison module second end
Pressure, the comparison module output end export the input terminal of high level to the control chip, and the control chip receives described
Second end of the output end output first control signal of the control chip to the switch module, institute are controlled when high level signal
When stating switch module and receiving the first control signal, control the switch module first end and the switch module
Three ends are in an off state, and the power supply stops being the load supplying.
In one embodiment, first division module includes the first divider resistance and the second divider resistance, and described the
Two division modules include third divider resistance and the 4th divider resistance；
The first end of first divider resistance is the first end of first division module, first divider resistance
Second end and the first end of second divider resistance connect the second end for constituting first division module, second partial pressure altogether
The second end of resistance is the third end of first division module；
The first end of the third divider resistance is the first end of second division module, the third divider resistance
Second end and the first end of the 4th divider resistance connect the second end for constituting second division module, the 4th partial pressure altogether
The second end of resistance is connected in the third end of second division module.
In one embodiment, the switch module includes first switch unit and second switch unit；
The first end of the first switch unit be the switch module second end, the second of the first switch unit
End ground connection, the third end of the first switch unit is connect with the first end of the second switch unit；
The second end of the second switch unit is the first end of the switch module, the third of the second switch unit
End is the third end of the switch module.
In one embodiment, the first switch unit is opened including the 5th resistance, the 6th resistance, the 7th resistance and first
Close element；
The first end of 5th resistance is connect with the first end of the first switching element, and the second of the 5th resistance
End and the first end of the 6th resistance connect the first end for constituting the first switch unit altogether；
The second end of 6th resistance is grounded；
The second end of the first switching element is connect with the first end of the 7th resistance, the first switching element
Third end is the third end of the first switch unit；
The second end of 7th resistance is the second end of the first switch unit.
In one embodiment, the second switch unit is opened including the 8th resistance, the 9th resistance, the tenth resistance and second
Close element；
The first end of 8th resistance be the second switch unit first end, the second end of the 8th resistance with
The first end of the second switch element is connected to the first end of the 9th resistance altogether；
The second end of 9th resistance is connect with the second end of the power resistor；
The second end of the second switch element is the second end of the second switch unit, the second switch element
Third end is the third end of the second switch unit；
The first end of tenth resistance is grounded, the second end of the tenth resistance and the third of the second switch element
End connection.
In one embodiment, the switch module further includes third switch unit, and the first of the third switch unit
End is connect with the output end of the comparison module, the second end ground connection of the third switch unit, the third switch unit
Third end is connect with the first end of the first switching element.
In one embodiment, the third switch unit includes eleventh resistor, first capacitor and third switch element；
The first end of the eleventh resistor is connect with the output end of the comparison module, and the second of the eleventh resistor
The first end of end and the third switch element is connected to the first end of the first capacitor altogether；
The second end of the third switch element and the second end of the first capacitor are connected to ground, the third switch member altogether
The third end of part is the third end of the third switch unit.
In one embodiment, the first switching element is triode Q1, and the triode Q1 is NPN type triode,
First end, second end and the third end of the first switching element are respectively the base stage of the triode Q1, emitter sum aggregate
Electrode.
In one embodiment, the second switch element is PMOS tube Q2, the first end of the second switch element, the
Two ends and third end are respectively grid, source electrode and the drain electrode of the PMOS tube Q2.
In one embodiment, the short-circuit protection circuit further includes pull-up resistor and pull down resistor, the pull-up resistor
First end connect to power supply, the second end of the pull-up resistor is connect with the first end of the eleventh resistor, the drop-down
The first end of resistance is connect with the first end of the eleventh resistor, the second end ground connection of the pull down resistor.
Short-circuit protection circuit provided in an embodiment of the present invention includes that the first end of the power resistor connects to power supply, described
The second end of power resistor is connect with the first end of the first end of first division module and the switch module respectively, described
The second end of first division module is connect with the first input end of the comparison module, the third termination of first division module
The first end on ground, second division module is connect with the power supply, and the second end of second division module is compared with described
Second input terminal of module connects, the third end ground connection of second division module, the output end of the comparison module with it is described
The input terminal connection of chip is controlled, the output end of the control chip is connect with the second end of the switch module, the switch
The third end of module and load connect；Wherein, the resistance value for the divider resistance that first division module includes is greater than described second
The resistance value for the divider resistance that division module includes.Since when load short circuits, the voltage of the comparison module first input end is small
In the voltage of the comparison module second end, the comparison module output end exports the input of high level to the control chip
End, the control chip control the output end output first control signal of the control chip when receiving the high level signal
To the second end of the switch module, when the switch module receives the first control signal, the switch module is controlled
First end and the third end of the switch module be in an off state, the power supply stops being the load supplying, Ke Yiyou
Effect stops power supply in load short circuits, prevents the damage of electronic device in power supply and load, improves safety, and structure letter
It list and is easily achieved, has saved cost.
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 only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is a kind of structural schematic diagram of short-circuit protection circuit provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of another short-circuit protection circuit provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of another short-circuit protection circuit provided in an embodiment of the present invention；
Fig. 4 is a kind of electronic component exemplary diagram of short-circuit protection circuit provided in an embodiment of the present invention.
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 process, method comprising a series of steps or units or system, product or
Equipment is not limited to listed step or unit, but optionally further comprising the step of not listing or unit or optional
Ground further includes the other step or units intrinsic for these process, methods, product or equipment.In addition, term " first ", " the
Two " and " third " etc. are for distinguishing different objects, not for description particular order.In order to illustrate technology of the present invention
Scheme, the following is a description of specific embodiments.
Embodiment one
The embodiment of the present invention provides a kind of short-circuit protection circuit, can be integrated in circuit board composition short-circuit protection equipment and be connected to
Between power supply and load, such as load is robot, mobile terminal (such as mobile phone, tablet computer), for giving in power supply
During load supplying when load short circuits, the damage of electronic device in power supply and load is prevented.Certainly, the short-circuit protection circuit
It can also be integrated in the power supply or load.
As shown in Figure 1, the short-circuit protection circuit 10 provided shown in the present embodiment includes 101, second points of the first division module
Die block 102, control chip 103, comparison module 104, power resistor 105 and switch module 106.
The first end of the power resistor 105 is connect with power supply 20, the second end of the power resistor 105 respectively with it is described
The first end of first division module 101 is connected with the first end of the switch module 106, and the of first division module 101
Two ends are connect with the first input end of the comparison module 104, the third end of first division module 101 ground connection, and described the
The first end of two division modules 102 is connect with the power supply 20, the second end of second division module 102 mould compared with described
Second input terminal of block 102 connects, the third end ground connection of second division module 102, the output end of the comparison module 104
It is connect with the input terminal of the control chip 103, the output end and the second of the switch module 106 of the control chip 103
The third end of end connection, the switch module 106 is connect with load 30.Wherein, the partial pressure electricity that first division module includes
The resistance value of resistance is greater than the resistance value for the divider resistance that second division module includes.
In the present embodiment, the resistance value for the divider resistance that above-mentioned first division module includes is greater than above-mentioned second division module
In include divider resistance resistance value, when 20 pairs of 30 normal power supplies of load of power supply, through power resistor 105 and the first division module
The voltage of the first input end of above-mentioned comparison module 104 is greater than the comparison module 104 after the second division module 102 partial pressure after partial pressure
The second input terminal voltage.The voltage of 104 first input end of comparison module is inputted greater than the comparison module 104 second
When the voltage at end, 104 output end of comparison module exports the input terminal of low level signal to the control chip 103, described
Control chip 103 controls 103 output end of the control chip output second control signal when receiving the low level signal
To the second end of the switch module 106, when the switch module 106 receives the second control signal, the switching molding
The third end of the first end of block 106 and the switch module 106 is in the conductive state, and the power supply 20 is normal to the load 30
Power supply.
In the present embodiment, when 30 short circuit of load, electric current moment increases, and the of above-mentioned first division module 101
The voltage meeting instantaneous reduction at two ends, thus the voltage meeting instantaneous reduction of 104 first input end of the comparison module, when the comparison
When the voltage of 104 first input end of module is reduced to less than the voltage of 104 second end of comparison module, the comparison module
104 output ends export the input terminal of high level to the control chip 103, and the control chip 103 receives the high level
Second end of the output end output first control signal of the control chip 103 to the switch module 106, institute are controlled when signal
When stating switch module 106 and receiving the first control signal, the first end of the switch module 106 and the switch module
106 third end is in an off state, and the power supply 20 stops being 30 power supply of load.
In one embodiment, as shown in Fig. 2, above-mentioned first division module 101 includes the first divider resistance R1 and second
Divider resistance R2, second division module 102 include third divider resistance R3 and the 4th divider resistance R4；First partial pressure
The first end of resistance R1 be first division module 101 first end, the second end of the first divider resistance R1 with it is described
The first end of second divider resistance R2 meets the second end for constituting first division module 101, the second divider resistance R2 altogether
Second end be first division module 101 third end；The first end of the third divider resistance R3 is described second point
The first end of die block 102, the second end of the third divider resistance R3 and the first end of the 4th divider resistance R4 connect altogether
The second end of second division module 102 is constituted, the second end of the 4th divider resistance R4 is connected in the second partial pressure mould
The third end of block 102.
In concrete application scene, the resistance value of above-mentioned first divider resistance is identical with the resistance value of above-mentioned third divider resistance,
The resistance value of above-mentioned second divider resistance is greater than the resistance value of above-mentioned first divider resistance.Certainly, can be specifically arranged according to practical application
So that the divider resistance value of above-mentioned first division module is greater than the divider resistance value of above-mentioned second division module, this is not done
It limits.
It can be seen that in embodiments of the present invention, due to when load short circuits, the electricity of the comparison module first input end
Pressure is less than the voltage of the comparison module second end, and the comparison module output end exports high level and controls the defeated of chip to described
Enter end, the control chip controls output end output the first control letter of the control chip when receiving the high level signal
Number to the switch module second end, when the switch module receives the first control signal, control the switching molding
The third end of the first end of block and the switch module is in an off state, and the power supply stops being the load supplying, can be with
Effectively stop power supply in load short circuits, prevents the damage of electronic device in power supply and load, improve safety, and structure
It simply and is easily achieved, has saved cost.
Embodiment two
The present embodiment is the further explanation to embodiment one, is realized based on embodiment one, the present embodiment and embodiment one
The same or similar place, for details, reference can be made to the associated descriptions of embodiment one, and details are not described herein again.As shown in figure 3, in this implementation
Above-mentioned switch module 106 includes first switch unit 1061 and second switch unit 1062 in example.
The first end of the first switch unit 1061 is the second end of the switch module 106, the first switch list
The second end ground connection of member 1061, the first end at the third end of the first switch unit 1061 and the second switch unit 1062
Connection；The second end of the second switch unit 1062 is the first end of the switch module 106, the second switch unit
1062 third end is the third end of the switch module 106.
In a particular application, when above-mentioned control chip 103 controls above-mentioned control core when receiving above-mentioned low level signal
103 output end of piece exports the first end of second control signal to above-mentioned first switch unit 1061, such as second control signal
Can be high level signal, the first end of the first switch unit 1061 can be the control terminal of first switch unit 1061, when
The first end of the first switch unit 1061 is connected when receiving the second control signal, therefore the first switch
The third end of the second end of unit 1061 and the first switch unit 1061 conducting, due to the first switch unit 1061
Second end ground connection, therefore the third end of the first switch unit 1061 is low level signal and exports to the second switch list
The first end of member 1062, the first end of the second switch unit 1062 can be the control terminal of the second switch unit 1062,
It is connected when the first end of the second switch unit 1062 receives the low level signal, therefore the second switch
The conducting of the third end of the second end of unit 1062 and the second switch unit 1062, the power supply 20 are normal to the load 30
Power supply.
In a particular application, above-mentioned control core is controlled when receiving above-mentioned high level signal in above-mentioned control chip 103
103 output end of piece exports the first end of first control signal to above-mentioned first switch unit 1061, such as first control signal
It can be low level signal, the first end of the first switch unit 1061 can be the control of the first switch unit 1061
End, is ended, described first opens when the first end of the first switch unit 1061 receives the first control signal
The third end for closing unit 1061 is high level signal and exports to the first end of the second switch unit 1062 that described second opens
The first end for closing unit 1062, which receives the high level signal and is in, is ended, therefore the second switch unit 1062
The third end of second end and the second switch unit 1062 disconnects, and the power supply 20 stops powering to the load 30.
In one embodiment, the switch module 106 further includes third switch unit, and the of the third switch unit
One end is connect with the output end of the comparison module 104, the second end ground connection of the third switch unit, and the third switch is single
The third end of member is connect with the first end of the first switch unit.
It can be seen that in embodiments of the present invention, due to when load short circuits, the electricity of the comparison module first input end
Pressure is less than the voltage of the comparison module second end, and the comparison module output end exports high level and controls the defeated of chip to described
Enter end, the control chip controls output end output the first control letter of the control chip when receiving the high level signal
Number to the switch module second end, when the switch module receives the first control signal, control the switching molding
The third end of the first end of block and the switch module is in an off state, and the power supply stops being the load supplying, can be with
Effectively stop power supply in load short circuits, prevents the damage of electronic device in power supply and load, improve safety, and structure
It simply and is easily achieved, has saved cost.
Embodiment three
Fig. 4 is a kind of electronic component exemplary diagram of short-circuit protection circuit provided in this embodiment, for ease of description, only
Part related to the present embodiment is shown, part relevant to previous embodiment can be found in the associated description of previous embodiment,
It is not repeating herein, as shown in Figure 4: in the present embodiment, the first switch unit 1061 includes the 5th resistance R5, the 6th resistance
R6, the 7th resistance R7 and first switching element Q1.
The first end of the 5th resistance R5 is connect with the first end of the first switching element Q1, the 5th resistance R5
Second end and the first end of the 6th resistance R6 connect the first end for constituting the first switch unit Q1 altogether；6th electricity
Hinder the second end ground connection of R6；The second end of the first switching element Q1 is connect with the first end of the 7th resistance R7, described
The third end of first switching element Q1 is the third end of the first switch unit Q1；The second end of the 7th resistance R7 is institute
State the second end of first switch unit Q1.
In one embodiment, the second switch unit includes the 8th resistance R8, the 9th resistance R9, the tenth resistance R10
With second switch element Q2.
The first end of the 8th resistance R8 is the first end of the second switch unit Q2, the of the 8th resistance R8
The first end of two ends and the second switch element Q2 are connected to the first end of the 9th resistance R9 altogether；The 9th resistance R9's
Second end is connect with the second end of the power resistor 105；The second end of the second switch element Q2 is the second switch
The second end of unit 1062, the third end of the second switch element Q2 are the third end of the second switch unit 1062；Institute
The first end ground connection of the tenth resistance is stated, the second end of the tenth resistance is connect with the third end of the second switch element Q2.
In one embodiment, first division module 102 includes the first divider resistance R1 and the second divider resistance R2,
Second division module 102 includes third divider resistance R3 and the 4th divider resistance R4.
The first end of the first divider resistance R1 is the first end of first division module 102, first partial pressure
The first input end that the second end of resistance R1 and the first end of the second divider resistance R2 connect the comparison module 104 altogether is (anti-
Phase input terminal)；The second end of the second divider resistance R2 is grounded；The first end of the third divider resistance R3 is described second
The first end of division module 102, the second end of the third divider resistance R3 and the first end of the 4th divider resistance R4 are total
Connect the second input terminal (non-inverting input terminal) of the comparison module 104；The second end of the 4th divider resistance R4 is grounded.
In one embodiment, power resistor 105, the first divider resistance R1, the second divider resistance R2, third divider resistance
The ratio that R3 and the 4th divider resistance R4 meets R2/ (R1+R2+R105) is greater than the relationship of R4/ (R3+R4).
In one embodiment, above-mentioned switch module 106 further includes third switch unit 1063, the third switch unit
1063 first end is connect with the output end of the comparison module 104, the second end ground connection of the third switch unit 1063, institute
The third end for stating third switch unit 1063 is connect with the first end of the first switching element Q1.The third switch unit
1063 include eleventh resistor R11, first capacitor C1 and third switch element Q3.
The first end of the eleventh resistor R11 is connect with the output end of comparison module 104, the eleventh resistor R11
Second end and the first end of the third switch element Q3 be connected to the first end of the first capacitor C1 altogether；The third switch
The second end of element Q3 and the second end of the first capacitor C1 are connected to ground altogether, and the third end of the third switch element Q3 is institute
State the third end of third switch unit 1063.
In one embodiment, the short-circuit protection circuit further includes pull-up resistor R12 and pull down resistor R13, it is described on
The first end of pull-up resistor R12 connects to power supply, and the first of the second end of the pull-up resistor R12 and the eleventh resistor R11
End connection, the first end of the pull down resistor R13 are connect with the first end of the eleventh resistor R11, the pull down resistor R13
Second end ground connection.
In a particular application, when loading 30 short circuit, output end output high level signal to the third of comparison module 104 is opened
When closing the first end of unit 1063, if the first end of third switch unit 1063 is control terminal.When third switch unit 1063
First end is connected when receiving high level signal, the second end of the third switch unit 1063 and the conducting of third end, from
And the third end of the third switch unit 1063 is low level signal, so that the first end of the first switch unit 1061 is
Low level signal, the first end of the first switch unit 1061 can be the control terminal of the first switch unit 1061, work as institute
It states when the first end of first switch unit 1061 receives the first control signal and is ended, the first switch unit
1061 third end is high level signal and exports to the first end of the second switch unit 1062, the second switch unit
1062 first end receives the high level signal and is ended, therefore the second end of the second switch unit 1062 and institute
The third end for stating second switch unit 1062 disconnects, and the power supply 20 stops powering to the load 30.It is switched by third single
Member 1063 and control chip 103 can realize duplicate protection, to further ensure safety in load short circuits.
In one embodiment, above-mentioned control chip 103 specifically can be single-chip microcontroller central processing unit (Central
Processing Unit, CPU) etc. can be realized the random devices of data processing and control function, can also be other general controls
Coremaking piece, Digital Signals chip (Digital Signal Processor, DSP), ARM microprocessor, dedicated integrated electricity
Road (Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field-
Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor logic,
Discrete hardware components etc..General controls chip can be microcontroller chip or the control chip is also possible to any conventional control
Coremaking piece etc..
In one embodiment, above-mentioned first switching element is preferably triode Q1 (in other embodiments, first switch
Element may be other switching tubes), the triode Q1 concretely NPN type triode, the of the first switching element
One end, second end and third end are respectively the base stage of the triode Q1, emitter and collector.Above-mentioned third switch element
Preferably triode Q3 (in other embodiments, third switch element may be other switching tubes), the triode Q3 tool
Body can be NPN type triode, and first end, second end and the third end of the third switch element are respectively the triode Q3
Base stage, emitter and collector.
In one embodiment, the second switch element is preferably PMOS tube Q2 (in other embodiments, second switch
Element may be other switching tubes), first end, second end and the third end of the second switch element are respectively described
Grid, source electrode and the drain electrode of PMOS tube Q2.
In one embodiment, above-mentioned comparison module 104 includes comparator U1, the comparator U1 concretely model
The comparator of the comparator of LM393 or other models.
It can be seen that the embodiment of the present invention, when load short circuits, the voltage of the comparison module first input end is less than institute
The voltage of comparison module second end is stated, the comparison module output end exports the input terminal of high level to the control chip, institute
It states and controls the output end output first control signal for controlling chip when control chip receives the high level signal to institute
The second end of switch module is stated, when the switch module receives the first control signal, controls the of the switch module
One end and the third end of the switch module are in an off state, and the power supply stops being the load supplying, can be effective
Stop power supply in load short circuits, prevent the damage of electronic device in power supply and load, improve safety, and structure it is simple and
It is easily achieved, has saved cost.
It should be understood that the size of the serial number of each step is not meant that the order of the execution order in above-described embodiment, each process
Execution sequence should be determined by its function and internal logic, the implementation process without coping with the embodiment of the present invention constitutes any limit
It is fixed.
It is apparent to those skilled in the art that for convenience of description and succinctly, only with above-mentioned each function
Can unit, module division progress for example, in practical application, can according to need and by above-mentioned function distribution by different
Functional unit, module are completed, i.e., the internal structure of described device is divided into different functional unit or module, more than completing
The all or part of function of description.In addition, the specific name of each functional unit, module is also only for convenience of distinguishing each other,
The protection scope being not intended to limit this application.The specific work process of unit in above system, module, can refer to aforementioned side
Corresponding process in method embodiment, details are not described herein.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment
The part of load may refer to the associated description of other embodiments.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all
It is included within protection scope of the present invention.
Claims (10)
1. a kind of short-circuit protection circuit, which is characterized in that the short-circuit protection circuit includes the first division module, the second partial pressure mould
Block, control chip, comparison module, power resistor and switch module；
The first end of the power resistor connects to power supply, the second end of the power resistor respectively with first division module
First end connected with the first end of the switch module, the of the second end of first division module and the comparison module
The connection of one input terminal, the third end ground connection of first division module, the first end of second division module and the power supply
Connection, the second end of second division module are connect with the second input terminal of the comparison module, second division module
Third end ground connection, the output end of the comparison module with it is described control chip input terminal connect, it is described control chip it is defeated
Outlet is connect with the second end of the switch module, and the third end of the switch module and load connect；Wherein, described first point
The resistance value for the divider resistance that die block includes is greater than the resistance value for the divider resistance that second division module includes；
When load short circuits, the voltage of the comparison module first input end is less than the voltage of the comparison module second end, institute
The input terminal that comparison module output end exports high level to the control chip is stated, the control chip receives the high level
Second end of the output end output first control signal of the control chip to the switch module, the switch are controlled when signal
When module receives the first control signal, control at the first end of the switch module and the third end of the switch module
In off-state, the power supply stops being the load supplying.
2. short-circuit protection circuit as described in claim 1, which is characterized in that first division module includes the first partial pressure electricity
Resistance and the second divider resistance, second division module includes third divider resistance and the 4th divider resistance；
The first end of first divider resistance be first division module first end, the second of first divider resistance
End and the first end of second divider resistance connect the second end for constituting first division module, second divider resistance altogether
Second end be first division module third end；
The first end of the third divider resistance be second division module first end, the second of the third divider resistance
End and the first end of the 4th divider resistance connect the second end for constituting second division module, the 4th divider resistance altogether
Second end be connected in the third end of second division module.
3. short-circuit protection circuit as described in claim 1, which is characterized in that the switch module include first switch unit and
Second switch unit；
The first end of the first switch unit is the second end of the switch module, the second termination of the first switch unit
Ground, the third end of the first switch unit are connect with the first end of the second switch unit；
The second end of the second switch unit is the first end of the switch module, and the third end of the second switch unit is
The third end of the switch module.
4. short-circuit protection circuit as claimed in claim 3, which is characterized in that the first switch unit include the 5th resistance,
6th resistance, the 7th resistance and first switching element；
The first end of 5th resistance is connect with the first end of the first switching element, the second end of the 5th resistance with
The first end of 6th resistance connects the first end for constituting the first switch unit altogether；
The second end of 6th resistance is grounded；
The second end of the first switching element is connect with the first end of the 7th resistance, the third of the first switching element
End is the third end of the first switch unit；
The second end of 7th resistance is the second end of the first switch unit.
5. short-circuit protection circuit as claimed in claim 3, which is characterized in that the second switch unit include the 8th resistance,
9th resistance, the tenth resistance and second switch element；
The first end of 8th resistance be the second switch unit first end, the second end of the 8th resistance with it is described
The first end of second switch element is connected to the first end of the 9th resistance altogether；
The second end of 9th resistance is connect with the second end of the power resistor；
The second end of the second switch element is the second end of the second switch unit, the third of the second switch element
End is the third end of the second switch unit；
The first end of tenth resistance is grounded, and the second end of the tenth resistance and the third end of the second switch element connect
It connects.
6. short-circuit protection circuit as claimed in claim 3, which is characterized in that the switch module further includes that third switch is single
The first end of member, the third switch unit is connect with the output end of the comparison module, and the second of the third switch unit
End ground connection, the third end of the third switch unit is connect with the first end of the first switching element.
7. short-circuit protection circuit as claimed in claim 6, which is characterized in that the third switch unit includes the 11st electricity
Resistance, first capacitor and third switch element；
The first end of the eleventh resistor is connect with the output end of the comparison module, the second end of the eleventh resistor with
The first end of the third switch element is connected to the first end of the first capacitor altogether；
The second end of the third switch element and the second end of the first capacitor are connected to ground altogether, the third switch element
Third end is the third end of the third switch unit.
8. short-circuit protection circuit as claimed in claim 4, which is characterized in that the first switching element is triode Q1, institute
Stating triode Q1 is NPN type triode, and first end, second end and the third end of the first switching element are respectively described three
The base stage of pole pipe Q1, emitter and collector.
9. short-circuit protection circuit as claimed in claim 5, which is characterized in that the second switch element is PMOS tube Q2, institute
The first end, second end and third end for stating second switch element are respectively grid, source electrode and the drain electrode of the PMOS tube Q2.
10. short-circuit protection circuit as claimed in claim 7, which is characterized in that the short-circuit protection circuit further includes pull-up electricity
Resistance and pull down resistor, the first end of the pull-up resistor connect to power supply, the second end of the pull-up resistor and the described 11st
The first end of resistance connects, and the first end of the pull down resistor is connect with the first end of the eleventh resistor, the drop-down electricity
The second end of resistance is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811404401.8A CN109449876A (en) | 2018-11-23 | 2018-11-23 | A kind of short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811404401.8A CN109449876A (en) | 2018-11-23 | 2018-11-23 | A kind of short-circuit protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN109449876A true CN109449876A (en) | 2019-03-08 |
Family
ID=65554159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811404401.8A Pending CN109449876A (en) | 2018-11-23 | 2018-11-23 | A kind of short-circuit protection circuit |
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| Country | Link |
|---|---|
| CN (1) | CN109449876A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110502088A (en) * | 2019-08-23 | 2019-11-26 | 苏州浪潮智能科技有限公司 | A kind of battery power supply protection device and server |
| CN112242692A (en) * | 2019-07-18 | 2021-01-19 | 浙江宇视科技有限公司 | Overcurrent protection circuit and power supply circuit |
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| JP2009240007A (en) * | 2008-03-26 | 2009-10-15 | Toyota Motor Corp | Power supply circuit |
| CN104485647A (en) * | 2014-12-23 | 2015-04-01 | 青岛歌尔声学科技有限公司 | Short-circuit protection circuit and power supply device |
| CN206834717U (en) * | 2017-06-19 | 2018-01-02 | 深圳市证通电子股份有限公司 | A kind of direct current current foldback circuit |
| CN107546797A (en) * | 2017-08-15 | 2018-01-05 | 上海与德科技有限公司 | Short-circuit protection circuit and electronic product |
| CN107800111A (en) * | 2017-12-07 | 2018-03-13 | 惠州市德赛西威汽车电子股份有限公司 | A kind of automobile button circuit with short-circuit protection |
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| JP2009240007A (en) * | 2008-03-26 | 2009-10-15 | Toyota Motor Corp | Power supply circuit |
| CN104485647A (en) * | 2014-12-23 | 2015-04-01 | 青岛歌尔声学科技有限公司 | Short-circuit protection circuit and power supply device |
| CN206834717U (en) * | 2017-06-19 | 2018-01-02 | 深圳市证通电子股份有限公司 | A kind of direct current current foldback circuit |
| CN107546797A (en) * | 2017-08-15 | 2018-01-05 | 上海与德科技有限公司 | Short-circuit protection circuit and electronic product |
| CN107800111A (en) * | 2017-12-07 | 2018-03-13 | 惠州市德赛西威汽车电子股份有限公司 | A kind of automobile button circuit with short-circuit protection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112242692A (en) * | 2019-07-18 | 2021-01-19 | 浙江宇视科技有限公司 | Overcurrent protection circuit and power supply circuit |
| CN112242692B (en) * | 2019-07-18 | 2022-10-04 | 浙江宇视科技有限公司 | Overcurrent protection circuit and power supply circuit |
| CN110502088A (en) * | 2019-08-23 | 2019-11-26 | 苏州浪潮智能科技有限公司 | A kind of battery power supply protection device and server |
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