CN204090244U - LED high speed stabilized current driving circuit - Google Patents
LED high speed stabilized current driving circuit Download PDFInfo
- Publication number
- CN204090244U CN204090244U CN201420521986.2U CN201420521986U CN204090244U CN 204090244 U CN204090244 U CN 204090244U CN 201420521986 U CN201420521986 U CN 201420521986U CN 204090244 U CN204090244 U CN 204090244U
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- Prior art keywords
- resistance
- triode
- led
- base stage
- electric current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
LED high speed stabilized current driving circuit, relates to a kind of LED control circuit; Comprise the clamp circuit be connected with controller and the current-limiting control circuit be connected with clamp circuit; During utility model works, when controller input voltage becomes large, clamp circuit carries out pressure drop to voltage, and when controller input voltage diminishes, clamp circuit is playing the effect of amplification, and meanwhile, the electric current flowing through LED diminishes, and causes the electric current of Q3 base stage to diminish.Because Q3 is operated in amplification region, so Q3 collector current diminishes, the collector current of Q2 diminishes, and the voltage of Q3 base stage can be made again to become large, and Q3 base voltage becomes then can make greatly Q1 collector current become large, and the electric current so flowing through LED will become large; The result of this process to make the electric current on LED1 trend towards stablizing; The technical solution of the utility model achieves when LED supply power voltage changes, and the electric current flowing through LED is remained unchanged, and ensures the constant of LED luminance.
Description
Technical field
The utility model relates to a kind of LED control circuit, is specially LED high speed stabilized current driving circuit.
Background technology
LED is indispensable a kind of device in Modern consumer electronics, and the outstanding role of LED product is its Presentation Function.Such as, the display (operating state of color difference representative is different) of equipment working state, device power state display etc.The use of LED is very simple, in many integrated LED circuit and circuit unit, power source generator is all needed to provide stable voltage for system, the voltage exported for preventing power source generator exceeds the magnitude of voltage that presets or needs the voltage by voltage generator exports to carry out step-down, the output of many voltage generators is connected with clamp circuit usually, but how to ensure when power supply instability, the brightness constancy keeping LED is problem demanding prompt solution.
Utility model content
The purpose of this utility model is to provide a kind of LED high speed stabilized current driving circuit, solves when power supply instability, keeps the problem of the brightness constancy of LED.
For achieving the above object, the utility model provides following technical scheme:
LED high speed stabilized current driving circuit, comprises the clamp circuit be connected with controller and the current-limiting control circuit be connected with clamp circuit; Described clamp circuit comprises operational amplifier U, metal-oxide-semiconductor Q1 and resistance R1 ~ R4; The drain electrode of described metal-oxide-semiconductor Q1 connects and accesses input voltage through resistance R1, the grid of metal-oxide-semiconductor Q1 is connected with the output out of single stage operational amplifier U and second resistance R2 one end, the source ground of metal-oxide-semiconductor Q1, operational amplifier U reverse input end is connected with the 3rd resistance R3 one end and the 4th resistance R4 one end, the 4th resistance R4 other end and the second resistance R2 other end ground connection, the 3rd resistance R3 other end drains with metal-oxide-semiconductor Q1 and is connected, and as circuit output end; Described current-limiting control circuit comprises triode Q4, triode Q3, resistance R5 and resistance R6; The drain electrode of metal-oxide-semiconductor Q1 is connected with the base stage of triode Q4, the emitter of triode Q4 is connected with triode Q3 base stage, the collector electrode of triode Q4 connects LED group, the base stage of triode Q1 is connected with one end of resistance R6, the collector electrode of triode Q3 is connected with the base stage of triode Q4, the collector electrode of triode Q3 is connected with one end of resistance R5, and the other end of resistance R6 and the base stage of triode Q4 are connected to form loop, and the other end of resistance R5 is connected with the emitter of triode Q3 and ground connection.
Further, described amplifier U is single stage operational amplifier, and energy consumption is little.
Compared with prior art, during utility model work, when controller input voltage becomes large, clamp circuit carries out pressure drop to voltage, and when controller input voltage diminishes, clamp circuit is playing the effect of amplification, meanwhile, the electric current flowing through LED diminishes, and causes the electric current of Q3 base stage to diminish.Because Q3 is operated in amplification region, so Q3 collector current diminishes, the collector current of Q2 diminishes, and the voltage of Q3 base stage can be made again to become large, and Q3 base voltage becomes then can make greatly Q1 collector current become large, and the electric current so flowing through LED will become large; The result of this process to make the electric current on LED1 trend towards stablizing; The technical solution of the utility model achieves when LED supply power voltage changes, and the electric current flowing through LED is remained unchanged, and ensures the constant of LED luminance.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
The technological means realized to make the utility model, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the utility model further.
LED high speed stabilized current driving circuit as shown in Figure 1, comprises the clamp circuit be connected with controller and the current-limiting control circuit be connected with clamp circuit; Described clamp circuit comprises single stage operational amplifier U, metal-oxide-semiconductor Q1 and resistance R1 ~ R4; The drain electrode of described metal-oxide-semiconductor Q1 connects and accesses input voltage through resistance R1, the grid of metal-oxide-semiconductor Q1 is connected with the output out of single stage operational amplifier U and second resistance R2 one end, the source ground of metal-oxide-semiconductor Q1, single stage operational amplifier U reverse input end is connected with the 3rd resistance R3 one end and the 4th resistance R4 one end, the 4th resistance R4 other end and the second resistance R2 other end ground connection, the 3rd resistance R3 other end drains with metal-oxide-semiconductor Q1 and is connected, and as circuit output end; Described current-limiting control circuit comprises triode Q4, triode Q3, resistance R5 and resistance R6; The drain electrode of metal-oxide-semiconductor Q1 is connected with the base stage of triode Q4, the emitter of triode Q4 is connected with triode Q3 base stage, the collector electrode of triode Q4 connects LED group, the base stage of triode Q1 is connected with one end of resistance R6, the collector electrode of triode Q3 is connected with the base stage of triode Q4, the collector electrode of triode Q3 is connected with one end of resistance R5, and the other end of resistance R6 and the base stage of triode Q4 are connected to form loop, and the other end of resistance R5 is connected with the emitter of triode Q3 and ground connection; Described amplifier U is single stage operational amplifier, and energy consumption is little.
During utility model works, when controller input voltage becomes large, clamp circuit carries out pressure drop to voltage, and when controller input voltage diminishes, clamp circuit is playing the effect of amplification, and meanwhile, the electric current flowing through LED diminishes, and causes the electric current of Q3 base stage to diminish.Because Q3 is operated in amplification region, so Q3 collector current diminishes, the collector current of Q2 diminishes, and the voltage of Q3 base stage can be made again to become large, and Q3 base voltage becomes then can make greatly Q1 collector current become large, and the electric current so flowing through LED will become large; The result of this process to make the electric current on LED1 trend towards stablizing.
More than show and describe general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (2)
1.LED high speed stabilized current driving circuit, is characterized in that: comprise the clamp circuit be connected with controller and the current-limiting control circuit be connected with clamp circuit; Described clamp circuit comprises operational amplifier U, metal-oxide-semiconductor Q1 and resistance R1 ~ R4; The drain electrode of described metal-oxide-semiconductor Q1 connects and accesses input voltage through resistance R1, the grid of metal-oxide-semiconductor Q1 is connected with the output out of single stage operational amplifier U and second resistance R2 one end, the source ground of metal-oxide-semiconductor Q1, operational amplifier U reverse input end is connected with the 3rd resistance R3 one end and the 4th resistance R4 one end, the 4th resistance R4 other end and the second resistance R2 other end ground connection, the 3rd resistance R3 other end drains with metal-oxide-semiconductor Q1 and is connected, and as circuit output end; Described current-limiting control circuit comprises triode Q4, triode Q3, resistance R5 and resistance R6; The drain electrode of metal-oxide-semiconductor Q1 is connected with the base stage of triode Q4, the emitter of triode Q4 is connected with triode Q3 base stage, the collector electrode of triode Q4 connects LED group, the base stage of triode Q1 is connected with one end of resistance R6, the collector electrode of triode Q3 is connected with the base stage of triode Q4, the collector electrode of triode Q3 is connected with one end of resistance R5, and the other end of resistance R6 and the base stage of triode Q4 are connected to form loop, and the other end of resistance R5 is connected with the emitter of triode Q3 and ground connection.
2. LED high speed stabilized current driving circuit according to claim 1, is characterized in that: described amplifier U is single stage operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420521986.2U CN204090244U (en) | 2014-09-12 | 2014-09-12 | LED high speed stabilized current driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420521986.2U CN204090244U (en) | 2014-09-12 | 2014-09-12 | LED high speed stabilized current driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204090244U true CN204090244U (en) | 2015-01-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420521986.2U Expired - Fee Related CN204090244U (en) | 2014-09-12 | 2014-09-12 | LED high speed stabilized current driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204090244U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117037871A (en) * | 2023-10-09 | 2023-11-10 | 之江实验室 | Reading circuit, reading method and memory for in-memory calculation result |
-
2014
- 2014-09-12 CN CN201420521986.2U patent/CN204090244U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117037871A (en) * | 2023-10-09 | 2023-11-10 | 之江实验室 | Reading circuit, reading method and memory for in-memory calculation result |
| CN117037871B (en) * | 2023-10-09 | 2024-02-27 | 之江实验室 | Reading circuit, reading method and memory for in-memory calculation result |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Yu Zhenlin Document name: Notification of Termination of Patent Right |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Tang Zhongcheng Inventor before: Yu Zhenlin |
|
| COR | Change of bibliographic data | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20161207 Address after: 156399 Jiamusi city of Heilongjiang Province, Fujin city Sanjiang Sunshine Community Building 2 1 stores Patentee after: Heilongjiang province Sanjiang Nongken Xin Ran construction and Installation Engineering Company Limited Address before: Baihe road Xiangshan County Industrial Park 315700 Zhejiang city of Ningbo Province Patentee before: Yu Zhenlin |
|
| DD01 | Delivery of document by public notice |
Addressee: Yu Zhenlin Document name: Notification of Passing Examination on Formalities |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150107 Termination date: 20170912 |