CN101980408A - Overcurrent protection circuit - Google Patents
Overcurrent protection circuit Download PDFInfo
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- CN101980408A CN101980408A CN2010105724942A CN201010572494A CN101980408A CN 101980408 A CN101980408 A CN 101980408A CN 2010105724942 A CN2010105724942 A CN 2010105724942A CN 201010572494 A CN201010572494 A CN 201010572494A CN 101980408 A CN101980408 A CN 101980408A
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Abstract
The invention relates to an overcurrent protection circuit. The circuit is formed by connecting a triode Q1, a resistor R1, a resistor R2 and a silicon-controlled rectifier Q2, wherein 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 connected with a base electrode of the triode Q1 and an anode of the silicon-controlled rectifier Q2 respectively; an emitting electrode of the triode Q1 is connected with one end of the second resistor R2 and a control electrode of the silicon-controlled rectifier Q2 respectively; and the other end of the resistor R2 is connected with a cathode of the silicon-controlled rectifier Q2 and an output end I2 of the circuit. The overcurrent protection circuit has the advantages of simple structure, reasonable design, stable and reliable performance, low use energy consumption, obvious practical effect, low manufacturing cost, high anti-interference capacity and wide application range, difficultly interferes with other circuits or is difficultly interfered by other circuits, and can be applied to various current circuits for protection.
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 the development of high-velocity electrons information, the stability of circuit design more and more causes people's great attention, and especially current protecting function can guarantee that more circuit safety moves reliably.But do not drop into current foldback circuit in some traditional current circuits; to such an extent as to it is excessive to work as circuital current; perhaps during wiring error; the big electric current of moment can burn the monoblock circuit; cause circuit working unusual, reliability and stability how to improve current circuit depend on the overcurrent protection function of circuit to a great extent.
Therefore, provide a kind of simple in structure, reasonable in design, use easy, obvious results current foldback circuit, be one of this field personnel problem that should address.
Summary of the invention
The purpose of design of this circuit is to overcome above-mentioned weak point, and a kind of advantages of simple, performance is safe and reliable, applicability is very strong current foldback circuit are provided.
The technical scheme that the design adopted is for achieving the above object: a kind of current foldback circuit is characterized in that this circuit is connected to form by triode Q1, resistance R 1, R2 and controllable silicon Q2; The input I1 of described circuit is connected with first resistance R, 1 one ends and triode Q1 collector electrode, and first resistance R, 1 other end is connected with triode Q1 base stage and controllable silicon Q2 anode respectively; Triode Q1 emitter is connected with the controllable silicon Q2 control utmost point with second resistance R, 2 one ends respectively; Second resistance R, 2 other ends are connected with controllable silicon Q2 negative electrode, and meet the output I2 of electric current.
The invention has the beneficial effects as follows: it is simple in structure, and is reasonable in design, stable and reliable for performance, uses energy consumption low, is difficult for disturbing other circuit or is disturbed by other circuit, and practical function is remarkable, can be applied to play a protective role in the various current circuits.Low cost of manufacture of the present invention, antijamming capability is strong, and is stable and reliable for performance, has wide range of applications.
Description of drawings
Fig. 1 is the invention circuit theory diagrams.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, details are as follows to embodiment, feature that foundation the design provides:
Referring to Fig. 1, a kind of current foldback circuit, this circuit is connected to form by triode Q1, resistance R 1, R2 and controllable silicon Q2; The input I1 of described circuit is connected with first resistance R, 1 one ends and triode Q1 collector electrode, and first resistance R, 1 other end is connected with triode Q1 base stage and controllable silicon Q2 anode respectively; Triode Q1 emitter is connected with the controllable silicon Q2 control utmost point with second resistance R, 2 one ends respectively; Second resistance R, 2 other ends are connected with controllable silicon Q2 negative electrode, and meet the output I2 of electric current.
Operation principle
The present invention is provided with an input I1, output I2 and current foldback circuit connects to form.The input current triode Q1 that flows through; flow out by resistance R 2; when protected circuital current is excessive; pressure drop on the resistance R 2 increases; the pressure drop control controllable silicon Q2 conducting that produce this moment, the moment of controllable silicon Q2 conducting is reduced the base voltage of triode Q1, and triode Q1 ends this moment; big current signal in the 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 rather than determinate, therefore in the variation and the modification that do not break away under the design's general plotting, should belong within the design's the protection range.
Claims (1)
1. a current foldback circuit is characterized in that this circuit is connected to form by triode Q1, resistance R 1, R2 and controllable silicon Q2; The input I1 of described circuit is connected with first resistance R, 1 one ends and triode Q1 collector electrode, and first resistance R, 1 other end is connected with triode Q1 base stage and controllable silicon Q2 anode respectively; Triode Q1 emitter is connected with the controllable silicon Q2 control utmost point with second resistance R, 2 one ends respectively; Second resistance R, 2 other ends are connected with controllable silicon Q2 negative electrode, and meet the output I2 of electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105724942A CN101980408A (en) | 2010-12-03 | 2010-12-03 | Overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105724942A CN101980408A (en) | 2010-12-03 | 2010-12-03 | Overcurrent protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101980408A true CN101980408A (en) | 2011-02-23 |
Family
ID=43600900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105724942A Pending CN101980408A (en) | 2010-12-03 | 2010-12-03 | Overcurrent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101980408A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751697A (en) * | 2012-07-25 | 2012-10-24 | 周芸 | Direct-current power supply over-current fuse wire |
| CN104684188A (en) * | 2013-12-03 | 2015-06-03 | 深圳市海洋王照明工程有限公司 | LED (Light-emitting Diode) drive circuit and mine explosion-proof lamp |
| CN106128042A (en) * | 2016-08-31 | 2016-11-16 | 无锡卓信信息科技股份有限公司 | A kind of hazardous materials transportation monitoring method |
| CN106205044A (en) * | 2016-08-31 | 2016-12-07 | 无锡卓信信息科技股份有限公司 | A kind of prison based on infrared acquisition monitoring method |
| CN106340075A (en) * | 2016-08-31 | 2017-01-18 | 无锡卓信信息科技股份有限公司 | Prisoner visiting method for prison |
| CN106410742A (en) * | 2016-11-03 | 2017-02-15 | 长沙群瑞电子科技有限公司 | High-speed DC electronic fuse circuit |
| CN106408046A (en) * | 2016-08-31 | 2017-02-15 | 无锡卓信信息科技股份有限公司 | Prison personnel positioning and monitoring method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2471007Y (en) * | 2001-01-08 | 2002-01-09 | 深圳市创益科技发展有限公司 | Telecontroller with solar cell member |
| US6633471B1 (en) * | 1999-04-22 | 2003-10-14 | Frank Ko | Overcurrent protection circuit, electric leakage protection circuit for an electric apparatus |
| CN201383668Y (en) * | 2009-02-24 | 2010-01-13 | 中山大洋电机股份有限公司 | Over-current protection circuit and motor controller applied to same |
| CN201887420U (en) * | 2010-12-03 | 2011-06-29 | 天津诺尔哈顿电器制造有限公司 | Overcurrent protective circuit |
-
2010
- 2010-12-03 CN CN2010105724942A patent/CN101980408A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6633471B1 (en) * | 1999-04-22 | 2003-10-14 | Frank Ko | Overcurrent protection circuit, electric leakage protection circuit for an electric apparatus |
| CN2471007Y (en) * | 2001-01-08 | 2002-01-09 | 深圳市创益科技发展有限公司 | Telecontroller with solar cell member |
| CN201383668Y (en) * | 2009-02-24 | 2010-01-13 | 中山大洋电机股份有限公司 | Over-current protection circuit and motor controller applied to same |
| CN201887420U (en) * | 2010-12-03 | 2011-06-29 | 天津诺尔哈顿电器制造有限公司 | Overcurrent protective circuit |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751697A (en) * | 2012-07-25 | 2012-10-24 | 周芸 | Direct-current power supply over-current fuse wire |
| CN104684188A (en) * | 2013-12-03 | 2015-06-03 | 深圳市海洋王照明工程有限公司 | LED (Light-emitting Diode) drive circuit and mine explosion-proof lamp |
| CN104684188B (en) * | 2013-12-03 | 2019-01-18 | 深圳市海洋王照明工程有限公司 | A kind of LED drive circuit and flameproof luminaire |
| CN106128042A (en) * | 2016-08-31 | 2016-11-16 | 无锡卓信信息科技股份有限公司 | A kind of hazardous materials transportation monitoring method |
| CN106205044A (en) * | 2016-08-31 | 2016-12-07 | 无锡卓信信息科技股份有限公司 | A kind of prison based on infrared acquisition monitoring method |
| CN106340075A (en) * | 2016-08-31 | 2017-01-18 | 无锡卓信信息科技股份有限公司 | Prisoner visiting method for prison |
| CN106408046A (en) * | 2016-08-31 | 2017-02-15 | 无锡卓信信息科技股份有限公司 | Prison personnel positioning and monitoring method |
| CN106410742A (en) * | 2016-11-03 | 2017-02-15 | 长沙群瑞电子科技有限公司 | High-speed DC electronic fuse circuit |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110223 |