CN102723692A - Overcurrent protection circuit with feedback - Google Patents
Overcurrent protection circuit with feedback Download PDFInfo
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- CN102723692A CN102723692A CN2012101469760A CN201210146976A CN102723692A CN 102723692 A CN102723692 A CN 102723692A CN 2012101469760 A CN2012101469760 A CN 2012101469760A CN 201210146976 A CN201210146976 A CN 201210146976A CN 102723692 A CN102723692 A CN 102723692A
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Abstract
The invention discloses an overcurrent protection circuit with a feedback, and belongs to the field of automatic control. The protection circuit comprises a sampling circuit, a feedback circuit, a switching circuit, and an adjustment circuit. On end of a protection point is connected to the sampling circuit, the other end of the protection point is connected to the feedback circuit and the adjustment circuit, the sampling circuit is connected to the switching circuit, the switching circuit is connected to the adjustment circuit, and the adjustment circuit is connected to the feedback circuit. The sampling circuit conducts voltage sampling when the protection point is triggered by overcurrent. When a sampled voltage reaches a preset value, the switching circuit is conducted, the adjustment circuit is cut off, and the protection point is protected. The overcurrent protection circuit of the invention can form overcurrent protection and quick-breaking protection conveniently. A circuit is automatically cut off when the current exceeds a limit value of the protection circuit to achieve the technical effect of protecting electrical components from being burned out by high current.
Description
Technical field
Automation control area of the present invention, particularly a kind of circuit overcurrent protection with feedback.
Background technology
When electric components such as the transmission line of electric power system, generator, transformer break down, can be through short circuit current in the system, and the fault point distance is the closer to power supply, and short circuit current is just big more, and this can cause electric component to be burnt out by super-high-current.
Summary of the invention
The object of the present invention is to provide simplicity of design, reasonable, the circuit overcurrent protection of practical band feedback can prevent that electric component from being burnt out by big electric current, and concrete technical scheme is following:
A kind of circuit overcurrent protection with feedback comprises: sample circuit, feedback circuit, switching circuit and adjustment circuit; Wherein, One end of said protection point is connected to said sample circuit, and an other end of protection point connects said feedback circuit and said adjustment circuit, and said sample circuit connects said switching circuit; Said switching circuit connects said adjustment circuit, and said adjustment circuit connects said feedback circuit;
After said protection point was triggered by overcurrent, said sample circuit carried out voltage sample, when sampled voltage reaches preset value, and said switching circuit conducting, said adjustment circuit ends, and said protection point is protected.
The present invention with respect to the beneficial effect of prior art is:
Protective circuit provided by the invention can constitute overcurrent protection and fast tripping protection easily, and when electric current surpassed the limit value of protective circuit, the meeting automatic shutoff circuit played the technique effect that protection is not burnt out by big electric current with electric component.
With reference to the explanation of accompanying drawing to the application embodiment, above-mentioned and other purpose of the application, feature and advantage will be more obvious through following.
Description of drawings
The application's embodiment will be described with reference to appended accompanying drawing below, wherein:
Fig. 1 is the circuit theory diagrams of the overcurrent protection of band feedback provided by the invention;
Fig. 2 is the composition diagram of the circuit overcurrent protection of band feedback provided by the invention.
Embodiment
Describe specific embodiment of the present invention in detail below in conjunction with accompanying drawing.Should be noted that the embodiments described herein only is used to illustrate, be not limited to the present invention.
Referring to Fig. 1 is the circuit theory diagrams of the circuit overcurrent protection of band feedback provided by the invention.Wherein, this protective circuit comprises sample circuit, feedback circuit, switching circuit and adjustment circuit.Wherein, protect an end of point to be connected to sample circuit, the other end connection feedback circuit of protection point and adjustment circuit (; According to Fig. 1; An other end of protection point is connected to the adjustment circuit, does not connect feedback circuit, PLSCONFM); Sample circuit is connected to switching circuit, and switching circuit is connected to the adjustment circuit.When protection point is triggered the post-sampling circuit sampling by overcurrent, when sampled voltage reaches a threshold value, conducting in the switching circuit, adjust and end in the circuit this moment, and the protection point is protected.After having served as current vanishes, the rheostat recovery voltage carries out work in the adjustment feedback circuit.
Referring to Fig. 2 is the composition diagram of the circuit overcurrent protection of band feedback provided by the invention.Wherein, sample circuit comprises resistance R 107, R108 and R109.Resistance R 108 and R109 series connection back one end and the parallel connection of resistance R 107 1 ends, an other end connects the base stage of switching circuit V101.Resistance R 107 other ends connect the emitter of switching circuit V101.
Feedback circuit comprises triode V106, resistance R 101, R106, R110, rheostat R102 and diode V107.Wherein, resistance R 101 1 ends are connected in the base stage of switching circuit V101, and an other end connects rheostat R102, and rheostat R102 intermediate ends connects triode V106 base stage, and an other terminating resistor R106, resistance R 106 other ends connect adjustment circuit V104 emitter.Triode V106 collector electrode connects the base stage of adjustment circuit V102.Triode V106 emitter connects the negative electrode of diode V107.Diode V107 anode connects the base stage of switching circuit V101.
Switching circuit comprises triode V101 and resistance R 103, R104, R105.Wherein, triode V101 base stage connects the common ends of resistance R 101 and R108 and R109.Triode V101 common collector connects the base stage of adjustment circuit V102.Triode V101 emitter connects the end of sample circuit R107.Resistance R 103, R104, R105 series connection back one end connects triode V101 collector electrode, and an other end connects adjustment circuit V102, V103, the collector electrode of V104.
The adjustment circuit comprises adjustment pipe V102, V103, V104.Wherein, adjustment pipe V102 base stage connects the common collector of switching circuit V101, and emitter connects the base stage of adjustment pipe V103.Adjustment pipe V103 emitter connects the base stage of adjustment pipe V104, and the emitter of adjustment pipe V104 connects the protection point through diode V105.Three adjustment pipe V102, V103, the V104 collector electrode is connected to an end of resistance R 105.
After the protection point was triggered by overcurrent, sample circuit carried out voltage sample, when sampled voltage reaches a threshold value (for example 0.3V), and V101 conducting in the switching circuit, adjust V102 in the circuit this moment, and V103, V104 end, and the protection point is protected.After overcurrent disappeared, the rheostat recovery voltage carried out work in the adjustment feedback circuit.
Though described the application with reference to exemplary embodiments, should be appreciated that used term is explanation and exemplary and nonrestrictive term.Because the application's practical implementation and do not break away from the spirit or the essence of invention in a variety of forms; So be to be understood that; The foregoing description is not limited to any aforesaid details; And should in enclose spirit that claim limited and scope, explain widely, therefore fall into whole variations and remodeling in claim or its equivalent scope and all should be the claim of enclosing and contain.
Claims (6)
1. the circuit overcurrent protection with feedback is characterized in that, comprising: sample circuit, feedback circuit, switching circuit and adjustment circuit; Wherein, One end of said protection point is connected to said sample circuit, and an other end of protection point connects said feedback circuit and said adjustment circuit, and said sample circuit connects said switching circuit; Said switching circuit connects said adjustment circuit, and said adjustment circuit connects said feedback circuit;
After said protection point was triggered by overcurrent, said sample circuit carried out voltage sample, when sampled voltage reaches preset value, and said switching circuit conducting, said adjustment circuit ends, and said protection point is protected.
2. protective circuit as claimed in claim 1; It is characterized in that; Said sample circuit comprises first resistance, second resistance and the 3rd resistance; The one end parallel connection of said second resistance and the 3rd resistance series connection back one end and said first resistance, an other end connects the base stage of said switching circuit, and the other end of said first resistance connects the emitter of said switching circuit.
3. protective circuit as claimed in claim 2 is characterized in that, said feedback circuit comprises first triode, the 4th resistance, the 5th resistance, the 6th resistance, rheostat and first diode; Wherein, The 4th resistance one end connects the base stage of said switching circuit; The other end connects a said rheostatic end, and said rheostatic intermediate ends connects said first transistor base, and an other end connects an end of said the 5th resistance; The other end of said the 5th resistance connects the emitter of said adjustment circuit; Said first triode connects the base stage of said adjustment circuit, and said first transistor emitter connects the negative electrode of said first diode, and the anode of said first diode connects the base stage of said switching circuit.
4. protective circuit as claimed in claim 3 is characterized in that, said switching circuit comprises second triode, the 7th resistance, the 8th resistance and the 9th resistance; Wherein, said second triode connects the common ends of said second resistance, the 3rd resistance and the 4th resistance; The said base stage that must let the triode common collector connect said adjustment circuit; Said second transistor emitter connects said sample circuit; Said the 7th resistance, the 8th resistance and the 9th resistance series connection back one end are connected said second transistor collector, and an other end connects the collector electrode of said adjustment circuit.
5. protective circuit as claimed in claim 4 is characterized in that, said adjustment circuit comprises the first adjustment pipe, the second adjustment pipe and the 3rd adjustment pipe; Wherein, the said first adjustment pipe base stage connects the common collector of said switching circuit, and emitter connects the base stage of the said second adjustment pipe; The said second adjustment pipe emitter connects the base stage of said the 3rd adjustment pipe, and said the 3rd adjustment pipe emitter connects said protection point through second diode, and the collector electrode of the said first adjustment pipe, the second adjustment pipe and the 3rd adjustment pipe is connected said the 9th resistance.
6. like any described protective circuit of claim 1-5, it is characterized in that, served as current vanishes after, through the voltage of manual recovery and protection point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101469760A CN102723692A (en) | 2012-01-05 | 2012-05-14 | Overcurrent protection circuit with feedback |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210001417 | 2012-01-05 | ||
| CN201210001417.0 | 2012-01-05 | ||
| CN2012101469760A CN102723692A (en) | 2012-01-05 | 2012-05-14 | Overcurrent protection circuit with feedback |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102723692A true CN102723692A (en) | 2012-10-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101469760A Pending CN102723692A (en) | 2012-01-05 | 2012-05-14 | Overcurrent protection circuit with feedback |
Country Status (1)
| Country | Link |
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| CN (1) | CN102723692A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242277A (en) * | 2013-06-21 | 2014-12-24 | 中国科学院微电子研究所 | Device for carrying out current-limiting protection on load or output |
| CN106911125A (en) * | 2017-03-13 | 2017-06-30 | 广东美的制冷设备有限公司 | SPM and its control method, air-conditioner |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3654518A (en) * | 1970-09-17 | 1972-04-04 | Caterpillar Tractor Co | Fast acting solid state circuit breaker |
| CN201570846U (en) * | 2009-09-03 | 2010-09-01 | 福州瑞盛继保工程技术有限公司 | Bi-feedback DC power short-circuit protection circuit |
| CN201887451U (en) * | 2010-10-30 | 2011-06-29 | 珠海市鑫和电器有限公司 | High-voltage overcurrent protection circuit |
| CN202772547U (en) * | 2012-01-05 | 2013-03-06 | 海信科龙电器股份有限公司 | Over-current protection circuit with feedback |
-
2012
- 2012-05-14 CN CN2012101469760A patent/CN102723692A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3654518A (en) * | 1970-09-17 | 1972-04-04 | Caterpillar Tractor Co | Fast acting solid state circuit breaker |
| CN201570846U (en) * | 2009-09-03 | 2010-09-01 | 福州瑞盛继保工程技术有限公司 | Bi-feedback DC power short-circuit protection circuit |
| CN201887451U (en) * | 2010-10-30 | 2011-06-29 | 珠海市鑫和电器有限公司 | High-voltage overcurrent protection circuit |
| CN202772547U (en) * | 2012-01-05 | 2013-03-06 | 海信科龙电器股份有限公司 | Over-current protection circuit with feedback |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242277A (en) * | 2013-06-21 | 2014-12-24 | 中国科学院微电子研究所 | Device for carrying out current-limiting protection on load or output |
| CN104242277B (en) * | 2013-06-21 | 2018-03-23 | 中国科学院微电子研究所 | A kind of device to loading or exporting progress current-limiting protection |
| CN106911125A (en) * | 2017-03-13 | 2017-06-30 | 广东美的制冷设备有限公司 | SPM and its control method, air-conditioner |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C05 | Deemed withdrawal (patent law before 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121010 |