CN207994603U - A kind of small signal control current foldback circuit - Google Patents
A kind of small signal control current foldback circuit Download PDFInfo
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- CN207994603U CN207994603U CN201820413996.2U CN201820413996U CN207994603U CN 207994603 U CN207994603 U CN 207994603U CN 201820413996 U CN201820413996 U CN 201820413996U CN 207994603 U CN207994603 U CN 207994603U
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- resistance
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- power supply
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- 238000001514 detection method Methods 0.000 claims abstract description 19
- 230000005611 electricity Effects 0.000 claims description 5
- 230000009977 dual effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model discloses a kind of small signals to control current foldback circuit, include mainly main control module N and current foldback circuit, main control module N includes master control IC, detection circuit for carrying out electric current output detection, power supply, small signal controls high voltage switch circuit, the output end of the power supply connects current foldback circuit, the utility model larger situation of electric current caused by there is short circuit may be implemented to power off, and then some components on electronic device is avoided to pass through excessive electric current, it ensure that the normal work of electronic device, it is whole effectively to realize dual overcurrent protection and the control of small signal.
Description
Technical field
The utility model is related to protection circuit fields, and current foldback circuit is controlled more particularly, to a kind of small signal.
Background technology
Current electronic device on the market is in operation, it may appear that the larger situation of electric current caused by short circuit, to make
Some components obtained on electronic device cannot withstand excessive electric current and burn out, and then cause electronic device cannot normal work
Make.
Therefore, for these reasons, a kind of current foldback circuit, traditional current foldback circuit is needed to mostly use triode
It alternately controls, integrally there is a situation where that error and detection be not tight.
Utility model content
The utility model is to overcome the above situation insufficient, it is desirable to provide a kind of technical solution that can be solved the above problems.
A kind of small signal control current foldback circuit, includes mainly main control module N and current foldback circuit, main control module
N includes master control IC, the detection circuit for carrying out electric current output detection, power supply, small signal control high voltage switch circuit, institute
The output end for stating power supply connects current foldback circuit, and the input terminal of detection circuit is also connected on the output end of power supply, detection
Circuit is used to detect the output current information of power supply, the signal incoming end of the output termination master control IC of detection circuit, master control
The signal output end of IC connects small signal control high voltage switch circuit, and small signal control high voltage switch circuit connects power supply and controls
The break-make of power supply.
As further program of the utility model：The current foldback circuit include resistance R1, resistance R2, resistance R3,
Resistance R4, resistance R5, resistance R6, triode Q1, triode Q2 and capacitance C1, output end and the resistance R1 of the power supply
Anode, the anode of resistance R2 and the transmitting emitting stage of triode Q1 be connected, the cathode of resistance R1 and the cathode of resistance R2,
The anode connection of the emitter, resistance R3 of triode Q1；The cathode of the resistance R3 and the base stage of triode Q2, resistance R4 are just
Pole connects；The base stage of the triode Q1 is connect with the anode of the collector of triode Q2, resistance R6；The collection of the triode Q1
Electrode is connect with the anode of the cathode of resistance R4, resistance R5；The cathode of the resistance R5 and the anode of diode VD1, capacitance C1
Anode connection；The cathode connection driving power L of the diode VD1.
As further program of the utility model：The cathode of the resistance R6 is connect with common ground end.
As further program of the utility model：The cathode of the capacitance C1 is connect with common ground end.
The beneficial effects of the utility model：The larger situation of electric current can be real caused by there is short circuit for the utility model
It now powers off, and then avoids some components on electronic device by excessive electric current, ensure that the normal work of electronic device,
It is whole effectively to realize dual overcurrent protection and the control of small signal.
The additional aspect and advantage of the utility model will be set forth in part in the description, partly will be from following description
In become apparent, or recognized by the practice of the utility model.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 is the utility model structure diagram.
Fig. 2 is the circuit diagram of current foldback circuit in the utility model.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Please refer to Fig.1~2, in the utility model embodiment, a kind of small signal controls current foldback circuit, and main includes master
Module N and current foldback circuit are controlled, main control module N includes master control IC, the detection circuit for carrying out electric current output detection, supplies
Power supply, small signal control high voltage switch circuit, and the output end of the power supply connects current foldback circuit, detection circuit it is defeated
Enter the output end that end is also connected on power supply, detection circuit is used to detect the output current information of power supply, detection circuit
The signal output end of the signal incoming end of output termination master control IC, master control IC connects small signal control high voltage switch circuit, small signal
Control high voltage switch circuit connects power supply and controls the break-make of power supply, and the current foldback circuit includes resistance R1, electricity
Hinder R2, resistance R3, resistance R4, resistance R5, resistance R6, triode Q1, triode Q2 and capacitance C1, the power supply it is defeated
Outlet is connected with the transmitting emitting stage of the anode of resistance R1, the anode of resistance R2 and triode Q1, the cathode of resistance R1 with
The anode connection of the cathode of resistance R2, the emitter of triode Q1, resistance R3；The base of the cathode and triode Q2 of the resistance R3
The anode connection of pole, resistance R4；The base stage of the triode Q1 is connect with the anode of the collector of triode Q2, resistance R6；Institute
The cathode for stating resistance R6 is connect with common ground end；The collector of the triode Q1 and the cathode of resistance R4, resistance R5 are just
Pole connects；The cathode of the resistance R5 is connect with the anode of the anode of diode VD1, capacitance C1；The cathode of the capacitance C1 is equal
It is connect with common ground end；The cathode connection driving power L of the diode VD1.
The operation principle of the utility model is：The case where powering is connected in power supply first, detection circuit is to output electricity
Galvanic electricity pressure is detected and feeds back to master control IC, and master control IC then plays the role of judgement, while master control IC according to setting value and leads to
Too small signal control high voltage switch circuit carries out switch control to power supply, if output current is met the requirements, the sides POW-IN
In power-up state, at this time triode Q2 conductings, under circuit normal operation, the BE pole tensions of triode Q1 are more than 3V,
Therefore the triode is also conducting.When this terminal shortcircuit of driving power L, triode Q1 cut-offs, due to R1 and R2 resistance
On the electric current that flows through become larger, cause the voltage on R1 and R12 to become larger, so that voltage of this point of VD1 is reduced so that triode Q1 is cut
Only, to protect this triode of triode Q1 without damage, the voltage of this point of VD1 reduces at this time, and driving power L cannot
Normal power supply.When driving power L restores open circuit, driving power L can also restore normal power supply, and entirety effectively realizes dual
Overcurrent protection and the control of small signal.
It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and
And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this practicality is new in other specific forms
Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this practicality is new
The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing in the equivalent requirements of the claims will be fallen
All changes in justice and range are embraced therein.Any reference numeral in claim should not be considered as limitation
Involved claim.
Claims (4)
1. a kind of small signal controls current foldback circuit, which is characterized in that include mainly main control module N and overcurrent protection electricity
Road, main control module N include master control IC, the detection circuit for carrying out electric current output detection, power supply, small signal control high pressure
The output end of switching circuit, the power supply connects current foldback circuit, and the input terminal of detection circuit is also connected on power supply
Output end, detection circuit are used to detect the output current information of power supply, the signal of the output termination master control IC of detection circuit
The signal output end of incoming end, master control IC connects small signal control high voltage switch circuit, and small signal control high voltage switch circuit connects confession
Power supply and the break-make for controlling power supply.
2. small signal according to claim 1 controls current foldback circuit, which is characterized in that the current foldback circuit packet
Resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, triode Q1, triode Q2 and capacitance C1 are included, it is described
The output end of power supply is connected with the transmitting emitting stage of the anode of resistance R1, the anode of resistance R2 and triode Q1, electricity
The cathode for hindering R1 is connect with the anode of the cathode of resistance R2, the emitter of triode Q1, resistance R3；The cathode of the resistance R3 with
The base stage of triode Q2, the anode connection of resistance R4；The base stage of the triode Q1 and the collector of triode Q2, resistance R6
Anode connection；The collector of the triode Q1 is connect with the anode of the cathode of resistance R4, resistance R5；The cathode of the resistance R5
It is connect with the anode of the anode of diode VD1, capacitance C1；The cathode connection driving power L of the diode VD1.
3. small signal according to claim 2 controls current foldback circuit, which is characterized in that the cathode of the resistance R6 with
Common ground end connects.
4. small signal according to claim 2 controls current foldback circuit, which is characterized in that the cathode of the capacitance C1 is equal
It is connect with common ground end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820413996.2U CN207994603U (en) | 2018-03-27 | 2018-03-27 | A kind of small signal control current foldback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820413996.2U CN207994603U (en) | 2018-03-27 | 2018-03-27 | A kind of small signal control current foldback circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207994603U true CN207994603U (en) | 2018-10-19 |
Family
ID=63829988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820413996.2U Active CN207994603U (en) | 2018-03-27 | 2018-03-27 | A kind of small signal control current foldback circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207994603U (en) |
-
2018
- 2018-03-27 CN CN201820413996.2U patent/CN207994603U/en active Active
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