CN103209531B - LED (Light Emitting Diode) dimming control circuit - Google Patents
LED (Light Emitting Diode) dimming control circuit Download PDFInfo
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- CN103209531B CN103209531B CN201310159109.5A CN201310159109A CN103209531B CN 103209531 B CN103209531 B CN 103209531B CN 201310159109 A CN201310159109 A CN 201310159109A CN 103209531 B CN103209531 B CN 103209531B
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Abstract
The invention relates to an LED (Light Emitting Diode) dimming control circuit which is characterized by comprising a calculation amplifier, a third resistor, a tenth resistor, a second resistor, a twelfth resistor and an eleventh resistor, wherein a dimming signal input end is connected with the first end of the third resistor; the second end of the third resistor is connected with the non-inverting input end of the calculation amplifier and the first end of the tenth resistor; the second end of the tenth resistor is grounded; the first end of the second resistor is connected with an external voltage stabilization direct-current power supply; the second end of the second resistor is connected with the inverted input end of the calculation amplifier; the first end of the twelfth resistor is connected with the second end of the second resistor; the second end of the twelfth resistor is grounded; two ends of the eleventh resistor are respectively connected with the output end and the inverted input end of the calculation amplifier; the output end of the calculation amplifier is used for outputting an LED driving current; and the output end of the calculation amplifier is connected with the input end of a feedback circuit of an LED dimming driver. The LED dimming control circuit ensures that the LED driving current is within the range of 10% to 100%.
Description
Technical field
The present invention relates to a kind of LED adjusting control circuit.
Background technology
More and more extensive along with LED application, people also more and more present diversified demand to the requirement of its application, particularly more and more focusing under the overall situation of environmental protection and energy saving now, people wish to spend minimum money, obtain the lighting solutions of environmental protection, therefore the application of LED light modulation is also just more and more extensive.
The signal of existing LED light regulating technology based on light modulation produces principle and mainly divides two classes: the one, and simulation light modulation, two is exactly PWM light modulation, the two all has a common defect: the LED drive current of the dim signal of input and output is to be all linear change substantially, different dimmers is not to be transferred to when minimum voltage all identical, some is at 1V, some can be lower than the lower meeting of 1V to 0V, will cause to be like this transferred to the obvious difference of brightness when the darkest with different dimmers at LED lamp and even can to extinguish; In the time that dimmer voltage is turned up full blast, all dimmer voltage all can be higher than 9V but some dimmer can be even higher higher than 10V, and the drive current of output LED increases, and may burn out LED lamp.
Summary of the invention
Technical problem to be solved by this invention is that to provide a kind of dim signal of no matter inputting for above-mentioned prior art be the LED adjusting control circuit of the high or low equal LED driving voltage that can ensure stable output within predetermined controlled range.
The present invention solves the problems of the technologies described above adopted technical scheme: this LED adjusting control circuit, it is characterized in that: comprise operational amplifier, the 3rd resistance, the tenth resistance, the second resistance, the 12 resistance, the 11 resistance, the 13 resistance, wherein, dim signal input is connected with the first end of the 3rd resistance, the second end of the 3rd resistance is connected with the in-phase input end of operational amplifier, the second end of the 3rd resistance is also connected with the first end of the tenth resistance, the second end ground connection of the tenth resistance; The first end of the second resistance is connected with external voltage stabilizing DC source, the second end of the second resistance is connected with the inverting input of operational amplifier, the first end of the 12 resistance is connected with the second end of the second resistance, the second end ground connection of the 12 resistance, the two ends of the 11 resistance are connected with inverting input with the output of operational amplifier respectively, the LED drive current that the output of operational amplifier is very exported, and be connected with the feedback unit of LED dimming driver after the output of operational amplifier connection the 13 resistance.
As improvement, above-mentioned LED adjusting control circuit also comprises the 8th resistance, the 9th resistance, diode, wherein the first end of the 9th resistance is also connected with external voltage stabilizing DC source, the first end of the 8th resistance is connected with the second end of the 9th resistance, the second end of the 8th resistance is connected with the in-phase input end of operational amplifier, the negative electrode of diode is connected with the second end of the 9th resistance, the plus earth of diode.
Improve, above-mentioned LED adjusting control circuit also comprises electric capacity again, and the first end of this electric capacity is connected with external voltage stabilizing DC source, the second end ground connection of this electric capacity.
Compared with prior art, the invention has the advantages that: LED adjusting control circuit provided by the invention, there is better compatibility, when the dim signal of input is during to 1V, 10% left and right that the LED drive current of output is maximum brightness, in the time that the dim signal of input is less than 1V, the LED drive current of output remains 10% of maximum brightness; When the dim signal of input is during higher than 9～10V, the LED drive current of output is stabilized in sets 100% of electric current, and when the dim signal of input is within the scope of 1～9V, the LED drive current of output is linear change.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of LED adjusting control circuit in the embodiment of the present invention;
Fig. 2 is the variation relation figure of the LED drive current exported in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the present invention.
LED adjusting control circuit as shown in Figure 1, it comprises operational amplifier U1A, the 3rd resistance R 3, the tenth resistance R 10, the second resistance R the 2, the 12 resistance R the 12, the 11 resistance R the 11, the 13 resistance R 13, the 8th resistance R 8, the 9th resistance R 9, diode D1, capacitor C 1, wherein, dim signal input IN is connected with the first end of the 3rd resistance R 3, the second end of the 3rd resistance R 3 is connected with the in-phase input end of operational amplifier U1A, the second end of the 3rd resistance R 3 is also connected with the first end of the tenth resistance R 10, the second end ground connection of the tenth resistance R 10, the first end of the second resistance R 2 is connected with external voltage stabilizing DC source VCC, the second end of the second resistance R 2 is connected with the inverting input of operational amplifier U1A, the first end of the 12 resistance R 12 is connected with the second end of the second resistance R 2, the second end ground connection of the 12 resistance R 12, the two ends of the 11 resistance R 11 are connected with inverting input with the output of operational amplifier U1A respectively, the LED drive current OUT that the output of operational amplifier U1A is very exported, and the output of operational amplifier U1A is connected with the feedback unit of LED dimming driver after connecting the 13 resistance R 13, the first end of the 9th resistance R 9 is also connected with external voltage stabilizing DC source VCC, the first end of the 8th resistance R 8 is connected with the second end of the 9th resistance R 9, the second end of the 8th resistance R 8 is connected with the in-phase input end of operational amplifier U1A, the negative electrode of diode D1 is connected with the second end of the 9th resistance R 9, the plus earth of diode D1, the first end of capacitor C 1 is connected with external voltage stabilizing DC source VCC, the second end ground connection of capacitor C 1.
Change the voltage of dim signal input IN, the voltage of the LED drive current OUT of output also changes thereupon; When " IN " voltage during to 1V the voltage of " OUT " reach VCCV, continue to turn down the voltage of " IN ", the voltage of " OUT " remains 0V; In the time that the voltage of " IN " is heightened 9V, the voltage of " OUT " equals VCC or different and different with the characteristic of operational amplifier U1A a little less than VCC(), continue to heighten the voltage of " IN ", the voltage when voltage of " OUT " equals 9V with " IN " is all the time identical.
Claims (2)
1. a LED adjusting control circuit, it is characterized in that: comprise operational amplifier, the 3rd resistance, the tenth resistance, the second resistance, the 12 resistance, the 11 resistance, the 13 resistance, the 8th resistance, the 9th resistance, diode, wherein, dim signal input is connected with the first end of the 3rd resistance, the second end of the 3rd resistance is connected with the in-phase input end of operational amplifier, and the second end of the 3rd resistance is also connected with the first end of the tenth resistance, the second end ground connection of the tenth resistance; The first end of the second resistance is connected with external voltage stabilizing DC source, the second end of the second resistance is connected with the inverting input of operational amplifier, the first end of the 12 resistance is connected with the second end of the second resistance, the second end ground connection of the 12 resistance, the two ends of the 11 resistance are connected with inverting input with the output of operational amplifier respectively, the LED drive current that the output of operational amplifier is very exported, and be connected with the feedback unit of LED dimming driver after the output of operational amplifier connection the 13 resistance; The first end of the 9th resistance is also connected with external voltage stabilizing DC source, the first end of the 8th resistance is connected with the second end of the 9th resistance, the second end of the 8th resistance is connected with the in-phase input end of operational amplifier, and the negative electrode of diode is connected with the second end of the 9th resistance, the plus earth of diode.
2. LED adjusting control circuit according to claim 1, is characterized in that: also comprise electric capacity, the first end of this electric capacity is connected with external voltage stabilizing DC source, the second end ground connection of this electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310159109.5A CN103209531B (en) | 2013-04-28 | 2013-04-28 | LED (Light Emitting Diode) dimming control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310159109.5A CN103209531B (en) | 2013-04-28 | 2013-04-28 | LED (Light Emitting Diode) dimming control circuit |
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| Publication Number | Publication Date |
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| CN103209531A CN103209531A (en) | 2013-07-17 |
| CN103209531B true CN103209531B (en) | 2014-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310159109.5A Active CN103209531B (en) | 2013-04-28 | 2013-04-28 | LED (Light Emitting Diode) dimming control circuit |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0660648A1 (en) * | 1993-12-27 | 1995-06-28 | Illinois Tool Works Inc. | Dimming circuit for a LED |
| CN101926222A (en) * | 2008-01-23 | 2010-12-22 | 科锐Led照明科技公司 | Dimming signal generation and methods of generating dimming signals |
| CN102497706A (en) * | 2011-12-15 | 2012-06-13 | 成都芯源系统有限公司 | Drive device, drive method and controller for LED |
| CN102625538A (en) * | 2012-03-27 | 2012-08-01 | 佛山市南海科谷电源有限公司 | Constant current LED (light-emitting diode) signal conditioning circuit |
| CN102695334A (en) * | 2012-05-11 | 2012-09-26 | 华南理工大学 | Intelligent light modulation apparatus for LED concentrated direct current power supply system |
| CN102932995A (en) * | 2012-11-06 | 2013-02-13 | 福建捷联电子有限公司 | Low-cost and high-efficiency light-emitting diode (LED) lamp string driving circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5329235B2 (en) * | 2006-01-31 | 2013-10-30 | コーニンクレッカ フィリップス エヌ ヴェ | LED driver circuit |
-
2013
- 2013-04-28 CN CN201310159109.5A patent/CN103209531B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0660648A1 (en) * | 1993-12-27 | 1995-06-28 | Illinois Tool Works Inc. | Dimming circuit for a LED |
| CN101926222A (en) * | 2008-01-23 | 2010-12-22 | 科锐Led照明科技公司 | Dimming signal generation and methods of generating dimming signals |
| CN102497706A (en) * | 2011-12-15 | 2012-06-13 | 成都芯源系统有限公司 | Drive device, drive method and controller for LED |
| CN102625538A (en) * | 2012-03-27 | 2012-08-01 | 佛山市南海科谷电源有限公司 | Constant current LED (light-emitting diode) signal conditioning circuit |
| CN102695334A (en) * | 2012-05-11 | 2012-09-26 | 华南理工大学 | Intelligent light modulation apparatus for LED concentrated direct current power supply system |
| CN102932995A (en) * | 2012-11-06 | 2013-02-13 | 福建捷联电子有限公司 | Low-cost and high-efficiency light-emitting diode (LED) lamp string driving circuit |
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|---|---|
| CN103209531A (en) | 2013-07-17 |
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Owner name: NINGBO SNAPPY OPTOELECTRONICS TECHNOLOGY CO., LTD. Free format text: FORMER NAME: NINGBO SNAPPY OPTOELECTRONICS CO., LTD. |
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Address after: 315040 No. 56, Keda Road, National Science and technology hi tech park, Zhejiang, Ningbo Patentee after: NINGBO SNAPPY OPTOELECTRONICS Co.,Ltd. Address before: 315040 No. 56, Keda Road, National Science and technology hi tech park, Zhejiang, Ningbo Patentee before: NINGBO SNAPPY OPTOELECTRONICS Co.,Ltd. |
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Address after: No. 122315000 Jianlan Road, Gaoxin District, Ningbo, Zhejiang Patentee after: Ningbo sainaibi Photoelectric Technology Co.,Ltd. Address before: 315040 No. 56 Keda Road, National High Tech Park, Ningbo, Zhejiang Patentee before: NINGBO SNAPPY OPTOELECTRONICS Co.,Ltd. |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: LED dimming control circuit Effective date of registration: 20230906 Granted publication date: 20141126 Pledgee: Industrial and Commercial Bank of China Limited Ningbo Dongmen Branch Pledgor: Ningbo sainaibi Photoelectric Technology Co.,Ltd. Registration number: Y2023980055465 |