CN106208650A - A kind of current protecting circuit and power circuit - Google Patents
A kind of current protecting circuit and power circuit Download PDFInfo
- Publication number
- CN106208650A CN106208650A CN201610599303.9A CN201610599303A CN106208650A CN 106208650 A CN106208650 A CN 106208650A CN 201610599303 A CN201610599303 A CN 201610599303A CN 106208650 A CN106208650 A CN 106208650A
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- CN
- China
- Prior art keywords
- power circuit
- resistance
- circuit
- outfan
- comparator
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Current Or Voltage (AREA)
- Electronic Switches (AREA)
Abstract
The present invention is applicable to current protection field, it is provided that a kind of current protecting circuit and power circuit.Circuit therein is placed in the outlet side of power circuit, and in parallel with the main circuit of power circuit, including: it is connected in parallel between the positive output end of power circuit and negative output terminal, exports the contrast module of a control signal when positive output end and negative output terminal occur adverse current；It is connected in parallel between positive output end and negative output terminal and the input connection contrast outfan of module, outfan are as the release end of power circuit, turn on the release module that adverse current electric current is discharged power circuit according to the control signal of contrast module output.The current protecting circuit that the present invention provides is in parallel with the switch main circuit of power circuit, its work when power circuit generation electric current adverse current, protection power circuit by adverse current circuit damage, prolongation power circuit service life.
Description
Technical field
The invention belongs to current protection field, particularly relate to a kind of current protecting circuit and power circuit.
Background technology
Along with the high speed development of Power Electronic Technique, electronic equipment is day by day close with the relation of the work of people, life, and
Electronic equipment be unable to do without reliable power circuit.Power circuit is to utilize modern power electronics technology, controls switching transistor and opens
Time ratio that is logical and that turn off, maintains a kind of power supply of regulated output voltage, and it has, and volume is little, lightweight, conversion efficiency is high
Etc. advantage, it is widely applied in each field.
But power circuit actually used during, often owing to external environment condition is abnormal, load faulty or load
Type and produce electric current backflow phenomena, serious meeting causes the damage of power circuit.
Summary of the invention
It is an object of the invention to provide a kind of current protecting circuit, it is intended to the power circuit that solving prior art provides is deposited
At backflow phenomena, cause the problem that power circuit damages.
In order to solve above-mentioned technical problem, the present invention is achieved in that a kind of current protecting circuit, described current protection
Circuit is placed in the outlet side of power circuit, and in parallel with the main circuit of described power circuit, and described current protecting circuit includes:
It is connected in parallel between positive output end and the negative output terminal of described power circuit, when positive output end and negative output terminal occur adverse current
Export the contrast module of a control signal；
It is connected in parallel between the described positive output end of power circuit and described negative output terminal and input connects described contrast module
Outfan, outfan are as the release end of described power circuit, according to the described control signal conducting of described contrast module output
The adverse current electric current of described positive output end and described negative output terminal to be discharged the release module of described power circuit.
Further, described contrast module may include that resistance R2, resistance R3, resistance R4, resistance R5, comparator, electric capacity
C1, diode D1, Zener diode D2；
The in-phase input end of described comparator connects described positive output end by resistance R4, connects described negative output by resistance R5
End；The inverting input of described comparator connects described positive output end by resistance R3, is connected described by Zener diode D2
Negative output terminal, and the inverting input of the negative electrode described comparator of connection of Zener diode D2；The anti-phase input of described comparator
Hold the in-phase input end being connected described comparator by electric capacity C1；The outfan of described comparator is described just by resistance R2 connection
Outfan, connects described negative output terminal by diode D1, and the negative electrode of diode D1 connects the outfan of described comparator；Institute
State the outfan input simultaneously as the outfan described release module of connection of described contrast module of comparator.
Further, described release module may include that resistance R1 and N-channel MOS pipe Q1；
The source electrode of described N-channel MOS pipe Q1 connects described positive output end by resistance R1, and the drain electrode of described N-channel MOS pipe Q1 is even
Connecing described negative output terminal, the grid of described N-channel MOS pipe Q1 connects described contrast module as the input of described release module
Outfan；The source electrode of described N-channel MOS pipe Q1 is simultaneously as the described release end of described power circuit.
Another object of the present invention is to provide a kind of power circuit, including a main circuit, described power circuit also includes
One current protecting circuit in parallel with described main circuit, described current protecting circuit is placed in the outlet side of described power circuit, institute
State current protecting circuit to include:
It is connected in parallel between positive output end and the negative output terminal of described power circuit, when positive output end and negative output terminal occur adverse current
Export the contrast module of a control signal；
It is connected in parallel between the described positive output end of power circuit and described negative output terminal and input connects described contrast module
Outfan, outfan are as the release end of described power circuit, according to the described control signal conducting of described contrast module output
The adverse current electric current of described positive output end and described negative output terminal to be discharged the release module of described power circuit.
Further, described contrast module may include that resistance R2, resistance R3, resistance R4, resistance R5, comparator, electric capacity
C1, diode D1, Zener diode D2；
The in-phase input end of described comparator connects described positive output end by resistance R4, connects described negative output by resistance R5
End；The inverting input of described comparator connects described positive output end by resistance R3, is connected described by Zener diode D2
Negative output terminal, and the inverting input of the negative electrode described comparator of connection of Zener diode D2；The anti-phase input of described comparator
Hold the in-phase input end being connected described comparator by electric capacity C1；The outfan of described comparator is described just by resistance R2 connection
Outfan, connects described negative output terminal by diode D1, and the negative electrode of diode D1 connects the outfan of described comparator；Institute
State the outfan input simultaneously as the outfan described release module of connection of described contrast module of comparator.
Further, described release module may include that resistance R1 and N-channel MOS pipe Q1；
The source electrode of described N-channel MOS pipe Q1 connects described positive output end by resistance R1, and the drain electrode of described N-channel MOS pipe Q1 is even
Connecing described negative output terminal, the grid of described N-channel MOS pipe Q1 connects described contrast module as the input of described release module
Outfan；The source electrode of described N-channel MOS pipe Q1 is simultaneously as the described release end of described power circuit.
The current protecting circuit that the present invention provides is in parallel with the switch main circuit of power circuit, and it occurs at power circuit
Work during electric current adverse current, protection power circuit by adverse current circuit damage, does not extends power circuit service life.
Accompanying drawing explanation
Fig. 1 is the function structure chart of the current protecting circuit that the embodiment of the present invention provides；
Fig. 2 is the circuit structure diagram of the current protecting circuit that the embodiment of the present invention provides.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and
It is not used in the restriction present invention.
Below in conjunction with specific embodiment the present invention implemented and is described in detail:
Fig. 1 shows the modular structure of the current protecting circuit that the embodiment of the present invention provides, for convenience of description, illustrate only with
The part that the embodiment of the present invention is relevant.
In the embodiment of the present invention, current protecting circuit is in parallel with the switch main circuit of power circuit, is placed in power circuit
Outlet side, including the contrast module 1 that is connected in parallel between the positive output end of power circuit and negative output terminal, for working as positive output
When end and negative output terminal occur adverse current, export a control signal；Be connected in parallel between the positive output end of power circuit and negative output terminal,
And the input connection contrast outfan of module 1, outfan are as the release module 2 of the release end of power circuit, for basis
The control signal conducting of contrast module output, thus the adverse current electric current of positive output end and negative output terminal is discharged power circuit.
Fig. 2 shows the circuit structure of the current protecting circuit that the embodiment of the present invention provides, and for convenience of description, only illustrates
The part relevant to the embodiment of the present invention.
Specifically, contrast module 1 may include that resistance R2, resistance R3, resistance R4, resistance R5, comparator U1, electric capacity C1,
Diode D1, Zener diode D2.
The in-phase input end of comparator U1 connects positive output end by resistance R4, connects negative output terminal by resistance R5；Ratio
The relatively inverting input of device U1 connects positive output end by resistance R3, connects negative output terminal, and voltage stabilizing by Zener diode D2
The negative electrode of diode D2 connects the inverting input of comparator U1；The inverting input of comparator U1 is connected by electric capacity C1 and compares
The in-phase input end of device U1；The outfan of comparator U1 connects positive output end by resistance R2, is connected negative defeated by diode D1
Go out end, and the negative electrode of diode D1 connects the outfan of comparator U1；The outfan of comparator U1 is simultaneously as contrast module 1
The input of outfan Connection Release module 2.
Zener diode D2 therein is as a reference source, it is provided that a stable reference voltage.When positive output end and negative output
When end occurs adverse current, this contrast module 1 is started working, and the adverse current electric current that positive output end is produced by comparator U1 is at in-phase input end
The magnitude of voltage produced compares with reference voltage；When the magnitude of voltage that in-phase input end produces is more than certain value, comparator U1
Outfan export a control signal to release module 2.
Specifically, release module 2 may include that resistance R1 and N-channel MOS pipe Q1.The source electrode of N-channel MOS pipe Q1 passes through
Resistance R1 connects positive output end, and the drain electrode of N-channel MOS pipe Q1 connects negative output terminal, and the grid of N-channel MOS pipe Q1 is as release
The input of module 2 connects the outfan of contrast module 1；The source electrode of N-channel MOS pipe Q1 is simultaneously as the release of power circuit
End.
Comparator U1 outfan output control signal N-channel MOS pipe Q1 is turned on so that countercurrent electric flow through by
Release end is discharged into outside power circuit.
The embodiment of the present invention additionally provides a kind of power circuit, protects including a main circuit and the electric current in parallel with main circuit
Protection circuit, this current protecting circuit is current protecting circuit as above, in order to avoid repeating, does not repeats them here.
The current protecting circuit that the present invention provides is in parallel with the switch main circuit of power circuit, and it occurs at power circuit
Work during electric current adverse current, protection power circuit by adverse current circuit damage, does not extends power circuit service life.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.
Claims (6)
1. a current protecting circuit, it is characterised in that described current protecting circuit is placed in the outlet side of power circuit, and with institute
The main circuit stating power circuit is in parallel, and described current protecting circuit includes:
It is connected in parallel between positive output end and the negative output terminal of described power circuit, when positive output end and negative output terminal occur adverse current
Export the contrast module of a control signal；
It is connected in parallel between the described positive output end of power circuit and described negative output terminal and input connects described contrast module
Outfan, outfan are as the release end of described power circuit, according to the described control signal conducting of described contrast module output
The adverse current electric current of described positive output end and described negative output terminal to be discharged the release module of described power circuit.
2. current protecting circuit as claimed in claim 1, it is characterised in that described contrast module includes: resistance R2, resistance
R3, resistance R4, resistance R5, comparator, electric capacity C1, diode D1, Zener diode D2；The in-phase input end of described comparator leads to
Cross resistance R4 and connect described positive output end, connect described negative output terminal by resistance R5；The inverting input of described comparator leads to
Cross resistance R3 and connect described positive output end, connect described negative output terminal, and the moon of Zener diode D2 by Zener diode D2
Pole connects the inverting input of described comparator；The inverting input of described comparator connects described comparator by electric capacity C1
In-phase input end；The outfan of described comparator connects described positive output end by resistance R2, is connected described by diode D1
Negative output terminal, and the outfan of the negative electrode described comparator of connection of diode D1；The outfan of described comparator is simultaneously as institute
The outfan stating contrast module connects the input of described release module.
3. current protecting circuit as claimed in claim 1 or 2, it is characterised in that described release module includes: resistance R1 and N
Channel MOS tube Q1；The source electrode of described N-channel MOS pipe Q1 connects described positive output end, described N-channel MOS pipe Q1 by resistance R1
Drain electrode connect described negative output terminal, the grid of described N-channel MOS pipe Q1 connects described as the input of described release module
The outfan of contrast module；The source electrode of described N-channel MOS pipe Q1 is simultaneously as the described release end of described power circuit.
4. a power circuit, including a main circuit, it is characterised in that described power circuit also includes one with described main circuit also
The current protecting circuit of connection, described current protecting circuit is placed in the outlet side of described power circuit, described current protecting circuit bag
Include: be connected in parallel between positive output end and the negative output terminal of described power circuit, when positive output end and negative output terminal occur adverse current
Export the contrast module of a control signal；It is connected in parallel between the described positive output end of power circuit and described negative output terminal and defeated
Enter end and connect the outfan of described contrast module, outfan as the release end of described power circuit, according to described contrast module
The described control signal of output turns on so that the adverse current electric current of described positive output end and described negative output terminal is discharged described power supply
The release module of circuit.
5. power circuit as claimed in claim 4, it is characterised in that described contrast module includes: resistance R2, resistance R3, electricity
Resistance R4, resistance R5, comparator, electric capacity C1, diode D1, Zener diode D2；The in-phase input end of described comparator is by electricity
Resistance R4 connects described positive output end, connects described negative output terminal by resistance R5；The inverting input of described comparator is by electricity
Resistance R3 connects described positive output end, connects described negative output terminal by Zener diode D2, and the negative electrode of Zener diode D2 is even
Connect the inverting input of described comparator；The inverting input of described comparator connects the homophase of described comparator by electric capacity C1
Input；The outfan of described comparator connects described positive output end by resistance R2, is connected described negative defeated by diode D1
Go out end, and the negative electrode of diode D1 connects the outfan of described comparator；The outfan of described comparator is simultaneously as described right
The input of described release module is connected than the outfan of module.
6. the power circuit as described in claim 4 or 5, it is characterised in that described release module includes: resistance R1 and N-channel
Metal-oxide-semiconductor Q1；The source electrode of described N-channel MOS pipe Q1 connects described positive output end, the leakage of described N-channel MOS pipe Q1 by resistance R1
Pole connects described negative output terminal, and the grid of described N-channel MOS pipe Q1 connects described contrast as the input of described release module
The outfan of module；The source electrode of described N-channel MOS pipe Q1 is simultaneously as the described release end of described power circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610599303.9A CN106208650A (en) | 2016-07-28 | 2016-07-28 | A kind of current protecting circuit and power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610599303.9A CN106208650A (en) | 2016-07-28 | 2016-07-28 | A kind of current protecting circuit and power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106208650A true CN106208650A (en) | 2016-12-07 |
Family
ID=57496023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610599303.9A Pending CN106208650A (en) | 2016-07-28 | 2016-07-28 | A kind of current protecting circuit and power circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106208650A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101673961A (en) * | 2008-09-11 | 2010-03-17 | 三美电机株式会社 | Charge controlling semiconductor integrated circuit |
| US20120049814A1 (en) * | 2010-08-25 | 2012-03-01 | Ricoh Company, Ltd. | Switching converter circuit |
| CN102916460A (en) * | 2011-08-03 | 2013-02-06 | 拉碧斯半导体株式会社 | Power supply control system and semiconductor integrated circuit |
| CN202772791U (en) * | 2012-08-16 | 2013-03-06 | 台达电子电源(东莞)有限公司 | Short circuit protection circuit used for parallel connection power supply |
| CN202798439U (en) * | 2012-07-18 | 2013-03-13 | 深圳市振华微电子有限公司 | Switching power supply and anti-reverse protective circuit of the same |
| CN103249213A (en) * | 2012-02-13 | 2013-08-14 | 东芝照明技术株式会社 | Power supply for illumination and luminaire |
| CN203313144U (en) * | 2013-01-23 | 2013-11-27 | 海能达通信股份有限公司 | Backflow prevention circuit |
| CN103441471A (en) * | 2013-08-01 | 2013-12-11 | 中国航天科技集团公司第九研究院第七七一研究所 | Over-current protection circuit of three-way output DC/DC converter |
-
2016
- 2016-07-28 CN CN201610599303.9A patent/CN106208650A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101673961A (en) * | 2008-09-11 | 2010-03-17 | 三美电机株式会社 | Charge controlling semiconductor integrated circuit |
| US20120049814A1 (en) * | 2010-08-25 | 2012-03-01 | Ricoh Company, Ltd. | Switching converter circuit |
| CN102916460A (en) * | 2011-08-03 | 2013-02-06 | 拉碧斯半导体株式会社 | Power supply control system and semiconductor integrated circuit |
| CN103249213A (en) * | 2012-02-13 | 2013-08-14 | 东芝照明技术株式会社 | Power supply for illumination and luminaire |
| CN202798439U (en) * | 2012-07-18 | 2013-03-13 | 深圳市振华微电子有限公司 | Switching power supply and anti-reverse protective circuit of the same |
| CN202772791U (en) * | 2012-08-16 | 2013-03-06 | 台达电子电源(东莞)有限公司 | Short circuit protection circuit used for parallel connection power supply |
| CN203313144U (en) * | 2013-01-23 | 2013-11-27 | 海能达通信股份有限公司 | Backflow prevention circuit |
| CN103441471A (en) * | 2013-08-01 | 2013-12-11 | 中国航天科技集团公司第九研究院第七七一研究所 | Over-current protection circuit of three-way output DC/DC converter |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20161207 |