CN209545128U - A kind of current foldback circuit - Google Patents
A kind of current foldback circuit Download PDFInfo
- Publication number
- CN209545128U CN209545128U CN201920278250.XU CN201920278250U CN209545128U CN 209545128 U CN209545128 U CN 209545128U CN 201920278250 U CN201920278250 U CN 201920278250U CN 209545128 U CN209545128 U CN 209545128U
- Authority
- CN
- China
- Prior art keywords
- switch unit
- switch
- capacitor
- output end
- input terminal
- 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.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to electronic technology fields, provide a kind of current foldback circuit, including rectification filtering module and switch module, and the switch module includes first switch unit and second switch unit；The output end of the rectification filtering module is electrically connected with the input terminal of the first switch unit, the output end of the first switch unit is electrically connected with the second switch unit controlled end, the input terminal of second switch unit is electrically connected with the output end of rectification filtering module, by in output end current exception, first switch unit and second switch unit can be rapidly switched off to protect late-class circuit, and after releasing extremely, then control second switch unit is closed first switch unit closure, normally to export supply voltage, compared to disposable fuse and it is easy thoroughly to burn self-recovery fuse, the cost of above-mentioned current foldback circuit is low, it can fuse infinitely and securely and reliably, and have the characteristics that response speed and resume speed are fast.
Description
Technical field
The utility model belongs to electronic technology field more particularly to a kind of current foldback circuit.
Background technique
Currently, electric current is excessive in circuit in order to prevent in traditional circuit design, it is excessive in electric current usually using fuse
When fusing to protect late-class circuit not to be damaged.However can not just restore after traditional blown fuse, it has blown and has just needed to change.
In order to just restore to have blown just to need to change after solving the problem of traditional blown fuse, occur in the market a kind of from extensive
Double insurance silk restores dual function, therefore in current circuit design since self-recovery fuse has overcurrent and overheating protection automatically
In, generally tend to the overcurrent protection work that circuit is completed using self-recovery fuse.
Self-recovery fuse by the polymer resin (Polymer) Jing Guo specially treated and be distributed in the inside conducting particles
(Carbon Black) composition.Conducting particles is closely strapped in outside crystalloid structure by polymer resin under normal operation,
Chain conductive path is constituted, self-recovery fuse at this time is low resistive state, and the electric current institute of self-recovery fuse is flowed through on route
The thermal energy of generation is small, will not change crystal structure.When short circuit or overload occur for route, the high current of self-recovery fuse is flowed through
The heat of generation melts polymer resin, and volume increases rapidly, forms high-impedance state, operating current is reduced rapidly, thus to electricity
Road is limited and is protected.After troubleshooting, self-recovery fuse crystallisation by cooling again, volume contraction, conducting particles is again
Conductive path is formed, self-recovery fuse reverts to low resistive state, so that the protection to circuit is completed, without artificial replacement.So
And current self-recovery fuse is slow in the presence of protection response speed, the slow and at high cost problem of resume speed.
In conclusion current self-recovery fuse exists, protection response speed is slow, and resume speed is slow and at high cost to ask
Topic.
Utility model content
In view of this, the utility model embodiment provides a kind of current foldback circuit, it is intended to solve current self- recoverage
Fuse, which exists, protects response speed slow, the slow and at high cost problem of resume speed.
The utility model embodiment provides a kind of current foldback circuit, including rectification filtering module and switch module,
The switch module includes first switch unit and second switch unit；
The output end of the rectification filtering module is electrically connected with the input terminal of the first switch unit, the first switch
The output end of unit is electrically connected with the input terminal of the second switch unit；
The rectification filtering module carries out rectifying and wave-filtering and by the voltage output after rectifying and wave-filtering to described to input voltage
First switch unit after carrying out expansion stream by the first switch unit and second switch unit, passes through the second switch list
Member output supply voltage；
When the current anomaly of the output end of the second switch unit, the second switch unit is turned off and is controlled described
The shutdown of first switch unit；When the current anomaly of the output end of the second switch unit releases, the first switch unit
It is closed and controls the second switch unit closure.
Above-mentioned current foldback circuit, by output end current exception, can rapidly switch off first switch unit and
For second switch unit to protect late-class circuit, and after releasing extremely, first switch unit closure then controls second switch list
Member closure compared to disposable fuse and is easy thoroughly to burn self-recovery fuse, above-mentioned mistake normally to export supply voltage
The cost of stream protection circuit is low, can fuse infinitely and securely and reliably, and have the characteristics that response speed and resume speed are fast.Have
It is slow in the presence of protection response speed to solve to effect current self-recovery fuse, the slow and at high cost problem of resume speed.
Detailed description of the invention
It, below will be to embodiment or the prior art in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only that this is practical new
Some embodiments of type for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram for the current foldback circuit that an embodiment of the present invention provides；
Fig. 2 is the exemplary circuit schematic diagram of switch module in current foldback circuit shown in FIG. 1；
Fig. 3 is the exemplary circuit schematic diagram of rectification filtering module in current foldback circuit shown in FIG. 1.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
It should be noted that term " includes " in the specification and claims of the utility model and they are any
Deformation, it is intended that cover and non-exclusive include.Such as system, product or the equipment comprising a series of units are not limited to
The unit listed, but optionally further comprising the step of not listing or unit, or optionally further comprising for these products or
The intrinsic other units of equipment.In addition, term " first ", " second " and " third " etc. are for distinguishing different objects, Er Feiyong
In description particular order.
The utility model embodiment protects response speed slow to solve current self-recovery fuse presence, resume speed
Slow and at high cost problem provides a kind of current foldback circuit, by that in output end current exception, can rapidly switch off
To protect late-class circuit, and after releasing extremely, first switch unit closure is then controlled for one switch unit and second switch unit
Second switch unit closure processed compared to disposable fuse and is easy thoroughly to burn self- recoverage normally to export supply voltage
The cost of fuse, above-mentioned current foldback circuit is low, can fuse infinitely and securely and reliably, and has response speed and restore speed
Spend fast feature.Efficiently solving current self-recovery fuse, to there is protection response speed slow, and resume speed is slow and cost
High problem.
In order to illustrate above-mentioned current foldback circuit, it is described in detail below in conjunction with specific embodiment:
Fig. 1 shows the structure of current foldback circuit provided by the embodiment of the utility model, for ease of description, only shows
Part related to the embodiment of the present invention, details are as follows:
Referring to Fig. 1, a kind of current foldback circuit 100 provided by the embodiment of the utility model, including rectification filtering module
110 and switch module 120, switch module 120 includes first switch unit 121 and second switch unit 122.
The output end of rectification filtering module 110 is electrically connected with the input terminal of first switch unit 121, first switch unit
121 output end is electrically connected with the controlled end of second switch unit 122, the input terminal and rectifying and wave-filtering of second switch unit 122
The output end of module 110 is electrically connected.
Rectification filtering module 110 carries out rectifying and wave-filtering to input voltage and opens the voltage output after rectifying and wave-filtering to first
It closes unit 121 and passes through second switch unit 122 after carrying out expansion stream by first switch unit 121 and second switch unit 122
Export supply voltage.
When the current anomaly of the output end of second switch unit 122, second switch unit 122 turns off and controls first and opens
Unit 121 is closed to turn off；When the current anomaly of the output end of second switch unit 122 releases, first switch unit 121 is closed simultaneously
Second switch unit 122 is controlled to be closed.
It should be noted that the input terminal of rectification filtering module 110 is connect with the power supply for providing input voltage.Second switch
The case where current anomaly of the output end of unit 122 includes the output terminal shortcircuit and second switch unit of second switch unit 122
The load excessive of 122 output end, leading to electric current is more than current threshold.
As shown in Fig. 2, first switch unit 121 includes first resistor R1, the first electricity as an embodiment of the present invention
Hold C1 and first switch tube Q1.
The first end of first resistor R1 is the input terminal of first switch unit 121, the second end of first resistor R1 and first
The first end of capacitor C1 connects, and the second end ground connection of first capacitor C1, the input terminal of first switch tube Q1 is with first resistor R1's
First end connection, the controlled end of first switch tube Q1 are connect with the second end of first resistor R1, the output end of first switch tube Q1
For the output end of first switch unit 121.
In a particular application, first switch tube Q1 is the first NPN type triode Q1, the current collection of the first NPN type triode Q1
The extremely input terminal of first switch tube Q1, the base stage of the first NPN type triode Q1 are the controlled end of first switch tube Q1, first
The output end of the emitter first switch tube Q1 of NPN type triode Q1.
As an embodiment of the present invention, second switch unit 1222 includes second switch Q2.
The input terminal of second switch Q2 is the input terminal of second switch unit 122, and the controlled end of second switch Q2 is
The controlled end of second switch unit 122, the output end of second switch Q2 are the output end of second switch unit 122.
It should be noted that in the present embodiment, the output end (OutPUT) of above-mentioned second switch unit 122 exports 48V
DC voltage.
In a particular application, second switch Q2 is the second NPN type triode Q2, the current collection of the second NPN type triode Q2
The extremely input terminal of second switch Q2, the base stage of the second NPN type triode Q2 are the controlled end of second switch Q2, second
The output end of the emitter second switch Q2 of NPN type triode Q2.
As shown in figure 3, as an embodiment of the present invention, above-mentioned rectification filtering module 110 include first diode D1,
Transient suppressor Z1, the second capacitor C2, third capacitor C3, filter U1, the 4th capacitor C4, the first inductance L1 and the 5th capacitor
C5。
The just extremely input terminal of rectification filtering module 110 of first diode D1, the cathode and transient state of first diode D1
The first end of suppressor Z1 connects, the second end ground connection of transient suppressor Z1, the first end and first diode of the second capacitor C2
The cathode of D1 connects, and the second end of the second capacitor C2 is connect with the second end of transient suppressor Z1, the first end of third capacitor C3
It is connect with the first end of the second capacitor C2, the second end of third capacitor C3 is connect with the second end of the second capacitor C2, filter U1
First end connect with the first end of third capacitor C3, the second end of filter U1 is connect with the first end of the 4th capacitor C4, filter
The third end of wave device U1 is connect with the second end of third capacitor C3, and the 4th end of filter U1 and the second end of the 4th capacitor C4 connect
It connects, the first end of the 4th capacitor C4 is connect with the first end of the first inductance L1, the second end ground connection of the 4th capacitor C4, the first inductance
The second end of L1 is connect with the first end of the 5th capacitor C5, the second end ground connection of the 5th capacitor C5, the first end of the 5th capacitor C5
For the output end of rectification filtering module 110.
In one embodiment, above-mentioned transient suppressor is Transient Suppression Diode, the type of above-mentioned Transient Suppression Diode
Number be SMBJ60CA.
In one embodiment, above-mentioned filter is common-mode filter, the model ACT45B- of above-mentioned common-mode filter
510-2P。
Above-mentioned current foldback circuit is described further below in conjunction with working principle and Fig. 2:
When second switch unit output supply current within the scope of the amplifying power of the second NPN type triode Q2
When, the emitter voltage of the second NPN type triode Q2 is lower than the base voltage of the second NPN type triode, at the same time, the
The emitter voltage of one NPN type triode Q1 is lower than the base voltage of the first NPN type triode Q1, at this point, first switch unit
121 and second switch unit 122 form typical common collector and expand current circuit, after 110 rectifying and wave-filtering of rectification filtering module
Voltage carries out expansion stream.At this point, the output voltage of second switch unit 122 is lower than the input voltage of first switch unit about
1.4V。
When the output terminal shortcircuit of second switch unit 122, or load the maximum drive more than the second NPN type triode Q2
When electric current, emitter voltage and the collector voltage that will lead to the second NPN type triode Q2 are almost equal, at this time the second NPN type
The pressure difference of the base voltage of the base voltage of triode Q2 and the first NPN type triode Q21 can disappear, and lose and maintain the 2nd NPN
The premise of the electric current output of the emitter of type triode Q2, therefore, the second NPN type triode Q2 enters cut-off guard mode, and
First NPN type triode Q1 also enters cut-off guard mode.
The second NPN type triode is no longer than when the output end short trouble of second switch unit 122 is released or loaded
When the maximum drive current of Q2, the condition of the second NPN type triode Q2 saturation is maintained to lose, first capacitor C1 can be slow at this time
Charging, the first NPN type triode Q1 can allow the second NPN type triode Q2 simultaneously by amplification region while by amplification region,
When output amplification current capacity meets current needs, circuit starts to the amplification output equilibrium-like of suitable current again
State.Under the premise of entering amplification region equilibration time spacing current responding ability, precisely highly sensitive current-limiting fuse is completed
Function.
Current foldback circuit provided in this embodiment is opened by that in output end current exception, can rapidly switch off first
Unit and second switch unit are closed to protect late-class circuit, and after releasing extremely, first switch unit closure then controls the
Two switch units closure compared to disposable fuse and is easy thoroughly to burn self- recoverage insurance normally to export supply voltage
Silk, the cost of above-mentioned current foldback circuit is low, can fuse infinitely and securely and reliably, and has response speed and resume speed fast
The characteristics of.It is slow in the presence of protection response speed to efficiently solve current self-recovery fuse, resume speed is slow and at high cost
Problem.
The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all practical at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the guarantor of the utility model within novel spirit and principle
Within the scope of shield.
Claims (8)
1. a kind of current foldback circuit, which is characterized in that including rectification filtering module and switch module, the switch module includes
First switch unit and second switch unit；
The output end of the rectification filtering module is electrically connected with the input terminal of the first switch unit, the first switch unit
Output end be electrically connected with the controlled end of the second switch unit, the input terminal of the second switch unit and the rectification filter
The output end of wave module is electrically connected；
The rectification filtering module carries out rectifying and wave-filtering to input voltage and by the voltage output after rectifying and wave-filtering to described first
Switch unit, it is defeated by the second switch unit after carrying out expansion stream by the first switch unit and second switch unit
Supply voltage out；
When the current anomaly of the output end of the second switch unit, the second switch unit turns off and controls described first
Switch unit shutdown；When the current anomaly of the output end of the second switch unit releases, the first switch unit closure
And control the second switch unit closure.
2. current foldback circuit according to claim 1, which is characterized in that the first switch unit includes the first electricity
Resistance, first capacitor and first switch tube；
The first end of the first resistor be the first switch unit input terminal, the second end of the first resistor with it is described
The first end of first capacitor connects, the second end ground connection of the first capacitor, the input terminal of the first switch tube and described the
The first end of one resistance connects, and the controlled end of the first switch tube is connect with the second end of the first resistor, and described first
The output end of switching tube is the output end of the first switch unit.
3. current foldback circuit according to claim 1, which is characterized in that the second switch unit includes second switch
Pipe；
The input terminal of the second switch is the input terminal of the second switch unit, and the controlled end of the second switch is
The controlled end of the second switch unit, the output end of the second switch are the output end of the second switch unit.
4. current foldback circuit according to claim 1, which is characterized in that the rectification filtering module includes the one or two pole
Pipe, transient suppressor, the second capacitor, third capacitor, filter, the 4th capacitor, the first inductance and the 5th capacitor；
The input terminal of the just extremely described rectification filtering module of the first diode, the cathode of the first diode with it is described
The first end of transient suppressor connects, the second end ground connection of the transient suppressor, the first end of second capacitor with it is described
The cathode of first diode connects, and the second end of second capacitor is connect with the second end of the transient suppressor, and described the
The first end of three capacitors is connect with the first end of second capacitor, the second end of the third capacitor and second capacitor
Second end connection, the first end of the filter connect with the first end of the third capacitor, the second end of the filter and
The first end of 4th capacitor connects, and the third end of the filter is connect with the second end of the third capacitor, the filter
4th end of wave device is connect with the second end of the 4th capacitor, and the of the first end of the 4th capacitor and first inductance
One end connection, the second end ground connection of the 4th capacitor, the first end of the second end of first inductance and the 5th capacitor
Connection, the second end ground connection of the 5th capacitor, the first end of the 5th capacitor is the output end of the rectification filtering module.
5. current foldback circuit according to claim 2, it is characterised in that:
The first switch tube is the first NPN type triode, the extremely described first switch of the current collection of first NPN type triode
The input terminal of pipe, the base stage of first NPN type triode are the controlled end of the first switch tube, first NPN type three
The output end of first switch tube described in the emitter of pole pipe.
6. current foldback circuit according to claim 3, it is characterised in that:
The second switch is the second NPN type triode, the extremely described second switch of the current collection of second NPN type triode
The input terminal of pipe, the base stage of second NPN type triode are the controlled end of the second switch, second NPN type three
The output end of second switch described in the emitter of pole pipe.
7. current foldback circuit according to claim 4, which is characterized in that the transient suppressor is that transient state inhibits two poles
Pipe.
8. current foldback circuit according to claim 4, which is characterized in that the filter is common-mode filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920278250.XU CN209545128U (en) | 2019-03-05 | 2019-03-05 | A kind of current foldback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920278250.XU CN209545128U (en) | 2019-03-05 | 2019-03-05 | A kind of current foldback circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209545128U true CN209545128U (en) | 2019-10-25 |
Family
ID=68274798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920278250.XU Active CN209545128U (en) | 2019-03-05 | 2019-03-05 | A kind of current foldback circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209545128U (en) |
-
2019
- 2019-03-05 CN CN201920278250.XU patent/CN209545128U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204205545U (en) | Power overcurrent protection circuit | |
| CN209462021U (en) | A kind of reverse connection preventing over-pressure safety device, earphone and USB charging unit | |
| CN102810851B (en) | Over-current protective circuit and digital output circuit | |
| CN208316566U (en) | Soft start power protecting circuit and Switching Power Supply | |
| CN208272621U (en) | A kind of power protecting circuit | |
| CN206283237U (en) | A kind of overvoltage crowbar | |
| CN216819369U (en) | Protection circuit, power supply circuit, and electronic device | |
| CN209545128U (en) | A kind of current foldback circuit | |
| CN212183122U (en) | Lightning protection voltage-resistant overcurrent protection circuit applied to products in power industry | |
| CN210867190U (en) | Reverse connection preventing equipment and reverse connection preventing system | |
| CN204858537U (en) | Battery discharge short -circuit protection circuit | |
| CN117477492A (en) | Overvoltage protection circuit | |
| CN103475191A (en) | Control circuit of switching power supply | |
| CN218829105U (en) | IGBT overvoltage protection circuit | |
| CN206628818U (en) | A kind of battery short circuit and under-voltage protecting circuit for high-density installation | |
| CN207234697U (en) | A kind of wind turbine SS (soft start) control circuit | |
| CN105810163A (en) | Boost direct current-direct current converter | |
| CN212137973U (en) | Overcurrent protection circuit, LED lamp and lamp | |
| CN212063492U (en) | RJ45 net mouth protection circuit | |
| CN208903924U (en) | Relay contact protection and codan | |
| CN107465173A (en) | A space power supply auxiliary power supply protection circuit | |
| CN202977969U (en) | Efficient protection circuit of laser coupling power source | |
| CN114884042A (en) | Low-voltage direct-current input power supply protection circuit based on surge suppression IC | |
| CN209104791U (en) | A kind of motor overcurrent protection circuit | |
| CN203056557U (en) | Frequency converter auxiliary power supply overcurrent protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211022 Address after: 337000 Building 5 and 7, artificial intelligence Industrial Park, Anyuan Industrial Park, Anyuan District, Pingxiang City, Jiangxi Province Patentee after: Jiangxi mammoth Energy Co.,Ltd. Address before: No. 31, Fengxiang Road, Wujin national high tech Industrial Development Zone, Changzhou City, Jiangsu Province 213100 Patentee before: CHANGZHOU MENGMA ELECTRIC TECHNOLOGY Co.,Ltd. |