CN207426671U - A kind of intrinsically safe circuit current foldback circuit - Google Patents
A kind of intrinsically safe circuit current foldback circuit Download PDFInfo
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- CN207426671U CN207426671U CN201721247373.4U CN201721247373U CN207426671U CN 207426671 U CN207426671 U CN 207426671U CN 201721247373 U CN201721247373 U CN 201721247373U CN 207426671 U CN207426671 U CN 207426671U
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Abstract
The utility model discloses a kind of intrinsically safe circuit current foldback circuit, including input positive terminal IN+, input negative pole end IN, diode ZD7, the first triode Q12, first resistor R48, second resistance R40,3rd resistor R39, the 4th resistance R62, the second triode Q18, the 5th resistance R12, the 6th resistance R41, the 7th resistance R3, third transistor Q6, the 8th resistance R13, the 4th triode Q13, the 9th resistance R42, the first capacitance C5, the tenth resistance R46, the 11st resistance R49, metal-oxide-semiconductor Q3, output cathode end OUT+ and output negative pole end OUT.Implement the beneficial effects of the utility model：Limit detection circuit is formed by pure resistance, and multiple protective is formed by peripheral cell, greatly improves the reliability and stability of current-limiting circuit.
Description
Technical field
The utility model is related to the Portable electronic equipment technical field of accumulator high current output more particularly to a kind of
Pacify circuit current foldback circuit.
Background technology
For the electrical equipment used in explosive atmosphere there are many type of explosion proof construc tion, wherein intrinsic safe explosion-proof pattern is to pass through limitation
Circuit energy achievees the purpose that explosion-proof.Especially in portable equipment, by rechargeable battery powered, due to battery self structure and
The defects of in terms of principle, when external short circuit occurs, battery transient large current discharge consumes big energy in internal resistance, generates huge
Big heat can set off an explosion.The possibility exploded in some cases in view of battery is larger, so the overcurrent protection to battery
It is proposed tightened up intrinsic safety requirement.
Utility model content
The purpose of this utility model is to provide a kind of intrinsically safe circuit current foldback circuits, solve hand-held in the prior art
In equipment, by rechargeable battery powered, the defects of due in terms of battery self structure and principle, when external short circuit occurs, battery
The problem of transient large current discharge consumes big energy in internal resistance, generates huge heat, can set off an explosion.
The technical solution of the utility model is realized as follows：
The utility model provides a kind of intrinsically safe circuit current foldback circuit, including：
Positive terminal is inputted, is connected to first node；
Negative pole end is inputted, is connected to section point；
Diode, one end are connected to the first node, and the other end is connected to the 3rd node；
First triode, base stage are connected to fourth node, and emitter-base bandgap grading is connected to the section point；
First resistor, one end are connected to the first node；
Second resistance, one end are connected to the other end of the first resistor, and the other end is connected to first triode
Collector；
3rd resistor, one end are connected to the fourth node, and the other end is connected to the 3rd node；
4th resistance, one end are connected to the fourth node, and the other end is connected to the 3rd node；
Second triode, base stage are connected between the first resistor and the second resistance, and emitter-base bandgap grading is connected to described
One node；
5th resistance, one end are connected to the collector of second triode, and the other end is connected to the 5th node；
6th resistance, one end are connected to the 5th node, and the other end is connected to the section point；
7th resistance, one end are connected to the section point, and the other end is connected to the 3rd node；
Third transistor, emitter-base bandgap grading are connected to the first node, and base stage is connected to the 6th node；
8th resistance, one end are connected to the collector of the third transistor, and the other end is connected to the 7th node；
4th triode, collector are connected to the 7th node, and base stage connects the 5th node, and emitter-base bandgap grading is connected to institute
State section point；
9th resistance, one end are connected to the 3rd node, and the other end is connected to the 7th node；
First capacitance, one end are connected to the 7th node, and the other end is connected to the 3rd node；
Tenth resistance, one end are connected to the first node, and the other end is connected to the 6th node；
11st resistance, one end are connected to the 6th node；
Metal-oxide-semiconductor, source electrode are connected to the 3rd node, and grid is connected to the 7th node；
Output cathode end is connected to the first node；
Output negative pole end is connected to the drain electrode of the other end and the metal-oxide-semiconductor of the 11st resistance.
In intrinsically safe circuit current foldback circuit described in the utility model, further include：
12nd resistance is connected between the first node and the diode.
In intrinsically safe circuit current foldback circuit described in the utility model, further include：
13rd resistance, one end are connected between the 12nd resistance and the diode, and the other end is connected to described
Fourth node.
In intrinsically safe circuit current foldback circuit described in the utility model, further include：
Second capacitance, one end are connected to the fourth node, and the other end is connected to the section point.
In intrinsically safe circuit current foldback circuit described in the utility model, further include：
3rd capacitance, one end are connected to the section point, and the other end is connected to the 5th node.
In intrinsically safe circuit current foldback circuit described in the utility model, further include：
14th resistance, one end are connected to the 3rd node, and the other end is connected to the output negative pole end.
In intrinsically safe circuit current foldback circuit described in the utility model, the section point ground connection.
On the other hand, a kind of intrinsically safe circuit current foldback circuit is provided, including：
Positive terminal is inputted, is connected to first node；
Negative pole end is inputted, is connected to section point；
Diode, one end are connected to the first node, and the other end is connected to the 3rd node；
First triode, base stage are connected to fourth node, and emitter-base bandgap grading is connected to the section point；
First resistor, one end are connected to the first node；
Second resistance, one end are connected to the other end of the first resistor, and the other end is connected to first triode
Collector；
3rd resistor, one end are connected to the fourth node, and the other end is connected to the 3rd node；
4th resistance, one end are connected to the fourth node, and the other end is connected to the 3rd node；
Second triode, base stage are connected between the first resistor and the second resistance, and emitter-base bandgap grading is connected to described
One node；
5th resistance, one end are connected to the collector of second triode, and the other end is connected to the 5th node；
6th resistance, one end are connected to the 5th node, and the other end is connected to the section point；
7th resistance, one end are connected to the section point, and the other end is connected to the 3rd node；
Third transistor, emitter-base bandgap grading are connected to the first node, and base stage is connected to the 6th node；
8th resistance, one end are connected to the collector of the third transistor, and the other end is connected to the 7th node；
4th triode, collector are connected to the 7th node, and base stage connects the 5th node, and emitter-base bandgap grading is connected to institute
State section point；
9th resistance, one end are connected to the 3rd node, and the other end is connected to the 7th node；
First capacitance, one end are connected to the 7th node, and the other end is connected to the 3rd node；
Tenth resistance, one end are connected to the first node, and the other end is connected to the 6th node；
11st resistance, one end are connected to the 6th node；
Metal-oxide-semiconductor, source electrode are connected to the 3rd node, and grid is connected to the 7th node；
Output cathode end is connected to the first node；
Output negative pole end is connected to the drain electrode of the other end and the metal-oxide-semiconductor of the 11st resistance；
12nd resistance is connected between the first node and the diode；
13rd resistance, one end are connected between the 12nd resistance and the diode, and the other end is connected to described
Fourth node；
Second capacitance, one end are connected to the fourth node, and the other end is connected to the section point；
3rd capacitance, one end are connected to the section point, and the other end is connected to the 5th node；
14th resistance, one end are connected to the 3rd node, and the other end is connected to the output negative pole end；Wherein, institute
State section point ground connection.
Therefore, the beneficial effects of the utility model are to form limit detection circuit by pure resistance, and pass through peripheral cell
Multiple protective is formed, greatly improves the reliability and stability of current-limiting circuit.
Description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is a kind of structure diagram for intrinsically safe circuit current foldback circuit that one embodiment of the utility model provides.
Specific embodiment
For a clearer understanding of the technical features, objectives and effects of the utility model, attached drawing will be compareed below
Specific embodiment of the present utility model is described in detail.It should be appreciated that following explanation is only the specific of the utility model embodiment
It illustrates, should not the scope of protection of the utility model be limited with this.
Referring to Fig. 1, Fig. 1 is a kind of knot for intrinsically safe circuit current foldback circuit 100 that one embodiment of the utility model provides
Structure schematic diagram.The intrinsically safe circuit current foldback circuit 100 include input positive terminal IN+, input negative pole end IN-, diode ZD7,
First triode Q12, first resistor R48, second resistance R40,3rd resistor R39, the 4th resistance R62, the second triode Q18,
5th resistance R12, the 6th resistance R41, the 7th resistance R3, third transistor Q6, the 8th resistance R13, the 4th triode Q13,
Nine resistance R42, the first capacitance C5, the tenth resistance R46, the 11st resistance R49, metal-oxide-semiconductor Q3, output cathode end OUT+ and output are negative
Extreme OUT-.
Input positive terminal IN+ is connected to first node 1；
Input negative pole end IN- is connected to section point 2；
Diode ZD7 one end is connected to the first node 1, and the other end is connected to the 3rd node 3；
First triode Q12 base stages are connected to fourth node 4, and emitter-base bandgap grading is connected to the section point 2；
First resistor R48 one end is connected to the first node 1；
Second resistance R40 one end is connected to the other end of the first resistor R48, and the other end is connected to the one or three pole
The collector of pipe Q12；
3rd resistor R39 one end is connected to the fourth node 4, and the other end is connected to the 3rd node 3；
4th resistance R62 one end is connected to the fourth node 4, and the other end is connected to the 3rd node 3；
Second triode Q18 base stages are connected between the first resistor R48 and the second resistance R40, emitter-base bandgap grading connection
In the first node 1；
5th resistance R12 one end is connected to the collector of the second triode Q18, and the other end is connected to the 5th node 5；
6th resistance R41 one end is connected to the 5th node 5, and the other end is connected to the section point 2；
7th resistance R3 one end is connected to the section point 2, and the other end is connected to the 3rd node 3；
Third transistor Q6 emitter-base bandgap gradings are connected to the first node 1, and base stage is connected to the 6th node 6；
8th resistance R13 one end is connected to the collector of the third transistor Q6, and the other end is connected to the 7th node 7；
4th triode Q13 collectors are connected to the 7th node 7, and base stage connects the 5th node 5, emitter-base bandgap grading connection
In the section point 2；
9th resistance R42 one end is connected to the 3rd node 3, and the other end is connected to the 7th node 7；
First capacitance C5 one end is connected to the 7th node 7, and the other end is connected to the 3rd node 3；
Tenth resistance R46 one end is connected to the first node 1, and the other end is connected to the 6th node 6；
11st resistance R49 one end is connected to the 6th node 6；
Metal-oxide-semiconductor Q3 source electrodes are connected to the 3rd node 3, and grid is connected to the 7th node 7；
Output cathode end OUT+ is connected to the first node 1；
Output negative pole end OUT- is connected to the leakage of the other end and the MOS pipes Q3 of the 11st resistance R49
Pole.
The utility model distinguishes the conducting and cut-off of controlling filed pipe Q3 by two parts circuit.Electric current is in design requirement scope
When interior, Q3 grid drivens, circuit normally；Once electric current is more than allowed band, Q3 will be off, and play protection electricity
The effect of pool equipment.Judge the detection of current sense resistor R3 voltages whether electric current is more than permissible value by Q12, once electric current
More than permissible value, circuit will be off, in order to avoid the thermally-induced fire of excessive electric current generation or explosion.
Wherein, there are two types of working conditions for circuit tool provided by the utility model：
One, normal operating conditions
1) in allowed band, Q13 is ended battery currents.R46, R49 form bleeder circuit and provide drive to Q6 base stages
Dynamic voltage is suitable that resistance is selected to make Q6 saturation conductions.
2) .Q6, R13, R42, C5 provide driving circuit for Q3, and suitable resistance, capacitance are provided by partial pressure to Q3 grids
Driving voltage and driving current, Q3 normallies, battery normally export.
Two, battery protection states
1) .R3 is current sense resistor, and battery operating current generates voltage difference, the base of NPN type triode Q12 when passing through R3
The voltage at R3 (A) is detected by parallel resistance R39, R62 in pole.If flow through electric current increase → A point voltages rise → B of R3
The base voltage Ube rises of point voltage rise → Q12, once it is more than that the scope allowed is even external short battery operating current occur
The situation on road, Ube ＞ PN junction threshold voltages, Q12 saturation conductions.Voltage-stabiliser tube ZD7 is positive to be used, and utilizes the spy of its PN junction 0.7V
Property, make Q12 base voltages Ube clamped in 0.7V or so.
2) .R48, R40, Q12 form bleeder circuit and provide driving voltage and driving current for PNP type triode Q18 base stages,
Suitable resistance makes Q18 saturation conductions.
3) .Q18, R12, R41 form bleeder circuit and provide driving voltage and driving current for NPN type triode Q13 base stages,
Suitable resistance make Q13 saturation conductions → Q13Uce be reduced to below Q3 threshold voltage of the grid → Q3 cut-offs → cell circuit breaks
It opens, so as to play a protective role.
Preferably, which further includes the 12nd resistance R38, the 13rd resistance R43,
Two capacitance C16, the 3rd capacitance C6 and the 14th resistance R6.
12nd resistance R38 is connected between the first node 1 and the diode ZD7.
13rd resistance R43 one end is connected between the 12nd resistance R38 and the diode ZD7, and the other end connects
It is connected to the fourth node 4.
Second capacitance C16 one end is connected to the fourth node 4, and the other end is connected to the section point 2.
3rd capacitance C6, one end are connected to the section point 2, and the other end is connected to the 5th node 5.
14th resistance R6, one end are connected to the 3rd node 3, and the other end is connected to the output negative pole end OUT-.
Preferably, the section point 2 is grounded.
There is provided herein the various operations of embodiment.In one embodiment, described one or operation may be constructed one
The computer-readable instruction stored on a or computer-readable medium, will be so that computing device be held when being performed by electronic equipment
The row operation.Describing the orders of some or all of operations, to should not be construed as to imply that these operations necessarily order dependent
's.It will be appreciated by those skilled in the art that the alternative sequence of the benefit with this specification.Furthermore, it is to be understood that it is not institute
There is operation that must exist in each embodiment provided in this article.
Moreover, word " preferred " used herein means serving as example, example or illustration.Feng Wen is described as " preferably
" any aspect or design be not necessarily to be construed as than other aspect or design it is more favourable.On the contrary, the use purport of word " preferred "
Concept is being proposed in specific ways.Term "or" as used in this application is intended to mean the "or" included and non-excluded
"or".I.e., unless otherwise or clear from the context, " X uses A or B " means that nature includes any one of arrangement.
That is, if X uses A；X uses B；Or X uses A and B both, then " X uses A or B " is met in foregoing any example.
Moreover, although the disclosure, people in the art has shown and described compared with one or realization method
Member is based on the reading to the specification and drawings and understands it will be appreciated that equivalent variations and modification.The disclosure includes all such
Modifications and variations, and be limited only by the scope of the following claims.In particular, to by said modules (such as element, resource
Deng) various functions that perform, the term for describing such component is intended to correspond to the specified function (example for performing the component
As it is functionally of equal value) random component (unless otherwise instructed), even if in structure with perform shown in this article
The open structure of function in disclosed exemplary implementations is not equivalent.In addition, the although special characteristic of the disclosure phase
Be disclosed for the only one in several realization methods, but this feature can with such as can be for given or specific application
It is one or other combinations of features it is expected with other favourable realization methods.Moreover, with regard to term " comprising ", " having ", " contain
Have " or its deformation be used in specific embodiment or claim for, such term be intended to with term " include " phase
As mode include.
Each functional unit in the utility model embodiment can be integrated in a processing module or each list
Member be individually physically present, can also two or more units be integrated in a module.Above-mentioned integrated module both can be with
It is realized, can also be realized in the form of software function module in the form of hardware.If the integrated module is with software
The form of function module is realized and is independent production marketing or computer-readable is deposited in use, one can also be stored in
In storage media.Storage medium mentioned above can be read-only memory, disk or CD etc..Above-mentioned each device or system,
The method in correlation method embodiment can be performed.
In conclusion although the utility model is disclosed above with preferred embodiment, above preferred embodiment is not used
To limit the utility model, those of ordinary skill in the art without departing from the spirit and scope of the utility model, can make
It is various to change and retouch, therefore the scope of protection of the utility model is subject to the scope that claim defines.
Claims (8)
1. a kind of intrinsically safe circuit current foldback circuit, which is characterized in that including：
Positive terminal is inputted, is connected to first node；
Negative pole end is inputted, is connected to section point；
Diode, one end are connected to the first node, and the other end is connected to the 3rd node；
First triode, base stage are connected to fourth node, and emitter-base bandgap grading is connected to the section point；
First resistor, one end are connected to the first node；
Second resistance, one end are connected to the other end of the first resistor, and the other end is connected to the current collection of first triode
Pole；
3rd resistor, one end are connected to the fourth node, and the other end is connected to the 3rd node；
4th resistance, one end are connected to the fourth node, and the other end is connected to the 3rd node；
Second triode, base stage are connected between the first resistor and the second resistance, and emitter-base bandgap grading is connected to the first segment
Point；
5th resistance, one end are connected to the collector of second triode, and the other end is connected to the 5th node；
6th resistance, one end are connected to the 5th node, and the other end is connected to the section point；
7th resistance, one end are connected to the section point, and the other end is connected to the 3rd node；
Third transistor, emitter-base bandgap grading are connected to the first node, and base stage is connected to the 6th node；
8th resistance, one end are connected to the collector of the third transistor, and the other end is connected to the 7th node；
4th triode, collector are connected to the 7th node, and base stage connects the 5th node, and emitter-base bandgap grading is connected to described the
Two nodes；
9th resistance, one end are connected to the 3rd node, and the other end is connected to the 7th node；
First capacitance, one end are connected to the 7th node, and the other end is connected to the 3rd node；
Tenth resistance, one end are connected to the first node, and the other end is connected to the 6th node；
11st resistance, one end are connected to the 6th node；
Metal-oxide-semiconductor, source electrode are connected to the 3rd node, and grid is connected to the 7th node；
Output cathode end is connected to the first node；
Output negative pole end is connected to the drain electrode of the other end and the metal-oxide-semiconductor of the 11st resistance.
2. intrinsically safe circuit current foldback circuit according to claim 1, which is characterized in that further include：
12nd resistance is connected between the first node and the diode.
3. intrinsically safe circuit current foldback circuit according to claim 2, which is characterized in that further include：
13rd resistance, one end are connected between the 12nd resistance and the diode, and the other end is connected to the described 4th
Node.
4. intrinsically safe circuit current foldback circuit according to claim 1, which is characterized in that further include：
Second capacitance, one end are connected to the fourth node, and the other end is connected to the section point.
5. intrinsically safe circuit current foldback circuit according to claim 1, which is characterized in that further include：
3rd capacitance, one end are connected to the section point, and the other end is connected to the 5th node.
6. intrinsically safe circuit current foldback circuit according to claim 1, which is characterized in that further include：
14th resistance, one end are connected to the 3rd node, and the other end is connected to the output negative pole end.
7. intrinsically safe circuit current foldback circuit according to claim 1, which is characterized in that the section point ground connection.
8. a kind of intrinsically safe circuit current foldback circuit, which is characterized in that including：
Positive terminal is inputted, is connected to first node；
Negative pole end is inputted, is connected to section point；
Diode, one end are connected to the first node, and the other end is connected to the 3rd node；
First triode, base stage are connected to fourth node, and emitter-base bandgap grading is connected to the section point；
First resistor, one end are connected to the first node；
Second resistance, one end are connected to the other end of the first resistor, and the other end is connected to the current collection of first triode
Pole；
3rd resistor, one end are connected to the fourth node, and the other end is connected to the 3rd node；
4th resistance, one end are connected to the fourth node, and the other end is connected to the 3rd node；
Second triode, base stage are connected between the first resistor and the second resistance, and emitter-base bandgap grading is connected to the first segment
Point；
5th resistance, one end are connected to the collector of second triode, and the other end is connected to the 5th node；
6th resistance, one end are connected to the 5th node, and the other end is connected to the section point；
7th resistance, one end are connected to the section point, and the other end is connected to the 3rd node；
Third transistor, emitter-base bandgap grading are connected to the first node, and base stage is connected to the 6th node；
8th resistance, one end are connected to the collector of the third transistor, and the other end is connected to the 7th node；
4th triode, collector are connected to the 7th node, and base stage connects the 5th node, and emitter-base bandgap grading is connected to described the
Two nodes；
9th resistance, one end are connected to the 3rd node, and the other end is connected to the 7th node；
First capacitance, one end are connected to the 7th node, and the other end is connected to the 3rd node；
Tenth resistance, one end are connected to the first node, and the other end is connected to the 6th node；
11st resistance, one end are connected to the 6th node；
Metal-oxide-semiconductor, source electrode are connected to the 3rd node, and grid is connected to the 7th node；
Output cathode end is connected to the first node；
Output negative pole end is connected to the drain electrode of the other end and the metal-oxide-semiconductor of the 11st resistance；
12nd resistance is connected between the first node and the diode；
13rd resistance, one end are connected between the 12nd resistance and the diode, and the other end is connected to the described 4th
Node；
Second capacitance, one end are connected to the fourth node, and the other end is connected to the section point；
3rd capacitance, one end are connected to the section point, and the other end is connected to the 5th node；
14th resistance, one end are connected to the 3rd node, and the other end is connected to the output negative pole end；Wherein, described
Two nodes are grounded.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721247373.4U CN207426671U (en) | 2017-09-26 | 2017-09-26 | A kind of intrinsically safe circuit current foldback circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721247373.4U CN207426671U (en) | 2017-09-26 | 2017-09-26 | A kind of intrinsically safe circuit current foldback circuit |
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|---|---|
| CN207426671U true CN207426671U (en) | 2018-05-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113206524A (en) * | 2021-04-30 | 2021-08-03 | 石家庄宇飞电子有限公司 | Ia-level intrinsic safety battery charging voltage feedback circuit |
-
2017
- 2017-09-26 CN CN201721247373.4U patent/CN207426671U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113206524A (en) * | 2021-04-30 | 2021-08-03 | 石家庄宇飞电子有限公司 | Ia-level intrinsic safety battery charging voltage feedback circuit |
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