CN201854178U - Practical overcurrent protecting circuit - Google Patents
Practical overcurrent protecting circuit Download PDFInfo
- Publication number
- CN201854178U CN201854178U CN2010205675157U CN201020567515U CN201854178U CN 201854178 U CN201854178 U CN 201854178U CN 2010205675157 U CN2010205675157 U CN 2010205675157U CN 201020567515 U CN201020567515 U CN 201020567515U CN 201854178 U CN201854178 U CN 201854178U
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- CN
- China
- Prior art keywords
- triode
- resistor
- power source
- practical
- overcurrent protecting
- 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.)
- Expired - Fee Related
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Abstract
The utility model relates to a practical overcurrent protecting circuit, which belongs to the technical field of electronics. One end of a resistor I is connected to a power source, the other end of the resistor I is connected to one end of a resistor II and then connected to an input end of a triode I, the other end of the resistor II is connected to the other end of the power source, one end of a collector electrode of the triode I is connected to one end of a resistor III and a base electrode of the diode II, the other end of the resistor III is connected to a power source, a collector electrode of the triode II is connected to the power source, emitter electrodes of the triode I and the triode II are connected mutually. The overcurrent protecting circuit has few elements, is simple and practical, is stable in performance, and can substitute multiple complicated overcurrent protecting circuits to protect a switch power source and a load completely. The practical overcurrent protecting circuit has wider application prospect.
Description
Technical field
The utility model relates to a kind of practical current foldback circuit, belongs to electronic technology field.
Background technology
Because control circuit more complicated in the Switching Power Supply, the ability of transistor and integrated device tolerance electricity, thermal shock is relatively poor, in use brings very big inconvenience to the user.Safety for protection switch power supply self and load; according to the principle and the characteristics of direct-current switch power supply; designed and crossed overtemperature protection; current protection, overvoltage protection and soft start etc.; a lot of protective circuit unusual complexity all in the reality; this time the current foldback circuit use very of design is simple, stable and reliable for performance.
Summary of the invention
The purpose of this utility model is to provide a kind of can improve direct-current switch power supply job security under adverse circumstances and under the situation such as catastrophic failure, ensures the safety of load.
To achieve these goals; the utility model adopts following technical scheme: a kind of practical current foldback circuit; the end of resistance I is connected on the power supply; the other end of resistance I links to each other with the end of resistance II and is connected on the input of triode I; the other end of resistance II is connected to the power supply other end; one end of the collector electrode of triode collection I links to each other with resistance III one end and links to each other with the base stage of triode II; the other end of resistance III is connected to power supply; the collector electrode of triode II is connected to power supply, and triode I links to each other with the emitter of triode II.
The utility model compared with prior art has following advantage:
1, the utility model circuit element is few, and is practical simple, and stable performance can substitute the protection of the current foldback circuit realization of a lot of complexity to Switching Power Supply and load fully.
2, the utlity model has very application prospects.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
Below in conjunction with Fig. 1 the utility model is described in detail: the end of resistance I 1 is connected on the power supply, the other end of resistance I 1 links to each other with the end of resistance II 2 and is connected on the input of triode I 4, the other end of resistance II 2 is connected to the power supply other end, one end of the collector electrode of triode collection I 4 links to each other with resistance III 3 one ends and links to each other with the base stage of triode II 5, the other end of resistance III 3 is connected to power supply, the collector electrode of triode II 5 is connected to power supply, and triode I 4 links to each other with the emitter of triode II 5.
Claims (1)
1. practical current foldback circuit; it is characterized in that: the end of resistance I (1) is connected on the power supply; the other end of resistance I (1) links to each other with the end of resistance II (2) and is connected on the input of triode I (4); the other end of resistance II (2) is connected to the power supply other end; one end of the collector electrode of triode collection I (4) links to each other with resistance III (3) one ends and links to each other with the base stage of triode II (5); the other end of resistance III (3) is connected to power supply; the collector electrode of triode II (5) is connected to power supply, and triode I (4) links to each other with the emitter of triode II (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205675157U CN201854178U (en) | 2010-10-19 | 2010-10-19 | Practical overcurrent protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205675157U CN201854178U (en) | 2010-10-19 | 2010-10-19 | Practical overcurrent protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201854178U true CN201854178U (en) | 2011-06-01 |
Family
ID=44096558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205675157U Expired - Fee Related CN201854178U (en) | 2010-10-19 | 2010-10-19 | Practical overcurrent protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201854178U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166197A (en) * | 2011-12-17 | 2013-06-19 | 西安恒飞电子科技有限公司 | Input over-current protection circuit of communication power supply module |
| CN104485644A (en) * | 2014-11-26 | 2015-04-01 | 四川天启智源科技有限公司 | Intelligent building energy management system |
-
2010
- 2010-10-19 CN CN2010205675157U patent/CN201854178U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166197A (en) * | 2011-12-17 | 2013-06-19 | 西安恒飞电子科技有限公司 | Input over-current protection circuit of communication power supply module |
| CN104485644A (en) * | 2014-11-26 | 2015-04-01 | 四川天启智源科技有限公司 | Intelligent building energy management system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110601 Termination date: 20111019 |