CN104577955A - Overcurrent protection circuit - Google Patents
Overcurrent protection circuit Download PDFInfo
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- CN104577955A CN104577955A CN201310504890.5A CN201310504890A CN104577955A CN 104577955 A CN104577955 A CN 104577955A CN 201310504890 A CN201310504890 A CN 201310504890A CN 104577955 A CN104577955 A CN 104577955A
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- circuit
- triode
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- overcurrent protection
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Abstract
The invention relates to an overcurrent protection circuit. The circuit is formed by connecting a triode Q1, resistors R1 and R2 and a silicon controlled rectifier Q2; an input end I1 of the circuit is connected with one end of the first resistor R1 and a collector electrode of the triode Q1; the other end of the first resistor R1 is respectively connected with a base electrode of the triode Q1 and an anode of the silicon controlled rectifier Q2; an emitting electrode of the triode Q1 is respectively connected with one end of the second resistor R2 and a control electrode of the silicon controlled rectifier Q2; and the other end of the second resistor R2 is connected with a cathode of the silicon controlled rectifier Q2 and is connected with an output end I2 of the circuit. The overcurrent protection circuit has a simple structure, is reasonable in design, is stable and reliable in performance, is low in use energy consumption, is difficult to interfere other circuits or interfere by other circuits, has an obvious practical effect and can be applied to various current circuits to take a protection effect. The overcurrent protection circuit is low in manufacturing cost and has strong anti-interference capacity, stable and reliable performance and a wide application range.
Description
Technical field
The present invention relates to a kind of protective circuit, particularly a kind of current foldback circuit.
Background technology
At present, in high-velocity electrons information development, the stability of circuit design more and more causes the great attention of people, especially current protecting function, more can guarantee that circuit safety runs reliably.But do not drop into current foldback circuit in some traditional current circuits; to such an extent as to when circuital current is excessive; or during wiring error; the big current of moment can burn monoblock circuit; cause circuit working abnormal, the reliability and stability how improving current circuit depend on the overcurrent protection function of circuit to a great extent.
Therefore, provide a kind of structure simple, reasonable in design, apply current foldback circuit that is easy, Be very effective, be one of this art problem that should address.
Summary of the invention
The purpose of design of this circuit is to overcome above-mentioned weak point, provides the current foldback circuit that a kind of advantages of simple, performance safety are reliable, applicability is very strong.
The technical scheme that the design adopts for achieving the above object is: a kind of current foldback circuit, it is characterized in that this circuit is connected to form by triode Q1, resistance R1, R2 and controllable silicon Q2; The input I1 of described circuit is connected with first resistance R1 one end and triode Q1 collector electrode, and the first resistance R1 other end is connected with triode Q1 base stage and controllable silicon Q2 anode respectively; Triode Q1 emitter controls pole with second resistance R2 one end and controllable silicon Q2 respectively and is connected; The second resistance R2 other end is connected with controllable silicon Q2 negative electrode, and meets the output I2 of electric current.
The invention has the beneficial effects as follows: its structure is simple, and reasonable in design, stable and reliable for performance, Energy in use is low, not easily disturbs other circuit or is disturbed by other circuit, practical function is remarkable, can be applied in various current circuit and play a protective role.Low cost of manufacture of the present invention, antijamming capability is strong, stable and reliable for performance, has wide range of applications.
Accompanying drawing explanation
Fig. 1 is invention circuit theory diagrams.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, to the embodiment provided according to the design, details are as follows for feature:
See Fig. 1, a kind of current foldback circuit, this circuit is connected to form by triode Q1, resistance R1, R2 and controllable silicon Q2; The input I1 of described circuit is connected with first resistance R1 one end and triode Q1 collector electrode, and the first resistance R1 other end is connected with triode Q1 base stage and controllable silicon Q2 anode respectively; Triode Q1 emitter controls pole with second resistance R2 one end and controllable silicon Q2 respectively and is connected; The second resistance R2 other end is connected with controllable silicon Q2 negative electrode, and meets the output I2 of electric current.
Operation principle
The present invention is provided with an input I1, an output I2 and current foldback circuit and connects to form.Input current flows through triode Q1; flowed out by resistance R2; when protected circuital current is excessive; pressure drop on resistance R2 increases; the pressure drop now produced controls controllable silicon Q2 conducting, and the moment of controllable silicon Q2 conducting makes the base voltage of triode Q1 reduce, and triode Q1 ends this moment; big current signal in cut-off loop, plays the important function of protective circuit and electric equipment.
Above-mentionedly being described in detail being applied to current foldback circuit with reference to example, is illustrative instead of determinate, therefore in the change do not departed under the design's general plotting and amendment, within the protection range that should belong to the design.
Claims (1)
1. a current foldback circuit, is characterized in that this circuit is connected to form by triode Q1, resistance R1, R2 and controllable silicon Q2; The input I1 of described circuit is connected with first resistance R1 one end and triode Q1 collector electrode, and the first resistance R1 other end is connected with triode Q1 base stage and controllable silicon Q2 anode respectively; Triode Q1 emitter controls pole with second resistance R2 one end and controllable silicon Q2 respectively and is connected; The second resistance R2 other end is connected with controllable silicon Q2 negative electrode, and meets the output I2 of electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310504890.5A CN104577955A (en) | 2013-10-23 | 2013-10-23 | Overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310504890.5A CN104577955A (en) | 2013-10-23 | 2013-10-23 | Overcurrent protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104577955A true CN104577955A (en) | 2015-04-29 |
Family
ID=53093433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310504890.5A Pending CN104577955A (en) | 2013-10-23 | 2013-10-23 | Overcurrent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104577955A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505538A (en) * | 2015-09-08 | 2017-03-15 | 江苏爱福特科技开发有限公司 | A kind of current foldback circuit |
-
2013
- 2013-10-23 CN CN201310504890.5A patent/CN104577955A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505538A (en) * | 2015-09-08 | 2017-03-15 | 江苏爱福特科技开发有限公司 | A kind of current foldback circuit |
| CN106505538B (en) * | 2015-09-08 | 2020-02-14 | 徐州立方机电设备制造有限公司 | Overcurrent protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150429 |
|
| WD01 | Invention patent application deemed withdrawn after publication |