CN104602418A - Adjustable constant flow source driving circuit for LED - Google Patents
Adjustable constant flow source driving circuit for LED Download PDFInfo
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- CN104602418A CN104602418A CN201510054643.9A CN201510054643A CN104602418A CN 104602418 A CN104602418 A CN 104602418A CN 201510054643 A CN201510054643 A CN 201510054643A CN 104602418 A CN104602418 A CN 104602418A
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Abstract
The invention discloses an adjustable constant flow source driving circuit for an LED (light-emitting diode). The driving circuit comprises an operation amplifier, a transistor and a single chip system, wherein the positive phase input end of the operation amplifier is connected with a reference voltage circuit, the grid electrode of the transistor is coupled with the output end of the operation amplifier through a resistor R4, the LED is connected between the drain electrode of the transistor and the reference voltage circuit, the single chip system is connected with the positive phase input end of the operation amplifier, the source electrode of the transistor is connected with the negative phase input end of the operation amplifier to form a current-series negative feed-back system, a grounded voltage sampling resistor R6 is connected between the source electrode of the transistor and the negative phase input end of the operation amplifier, nodes A are formed between the source electrode of the transistor and a voltage sampling resistor R6, the single chip system is used for adjusting the control voltage of the positive phase input end of the operation amplifier according to the voltage signals acquired from the nodes A, and a grounded divider resistor R5 is connected between the resistor R4 and the grid electrode of the transistor. The driving circuit is controlled by the single chip system, thus current change can be steadily and continuously controlled when the voltage on the positive phase input end of the operation amplifier is adjusted.
Description
Technical field
The present invention relates to a kind of LED adjustable constant-flow source driving circuit.
Background technology
In today that the energy and environmental problem are on the rise, the attention of people is obtained with the LED with features such as efficient, energy-saving and environmental protection, life-span are long, if the traditional lighting of poor efficiency, highly energy-consuming at present can be replaced with LED illumination, undoubtedly very important effect is played to the current more and more urgent energy shortage of alleviation and ecological deterioration problem.
The voltage-current characteristic of LED is identical with the voltage-current characteristic of general-purpose diode, the sharply change that will cause forward current compared with minor swing of forward voltage, the size of LED forward current can change with variation of ambient temperature, and environment reaches uniform temperature, and LED allows that forward current can sharply reduce, in the case, if still by big current, easily cause LED aging, reduction of service life, in order to address this problem, need to provide a kind of constant current and the adjustable LED drive circuit of constant current value.
Summary of the invention
In order to solve the deficiency in background technology, the object of the invention is to the defect overcoming background technology, providing the LED constant current source driving circuit that a kind of adjustable range is large, precision is high, the constant-current source of output has higher accuracy and stability.
For achieving the above object, the technical solution used in the present invention is: a kind of LED adjustable constant-flow source driving circuit, comprise the operational amplifier that normal phase input end connects reference voltage circuit, the transistor that grid is coupled by resistance R4 and operational amplifier output terminal, described LED is connected between the drain electrode of transistor and reference voltage circuit, it is characterized in that: it also comprises the Single Chip Microcomputer (SCM) system being connected to operational amplifier normal phase input end, the source electrode of transistor is connected to the negative-phase input formation series electric circuit negative feedback system of operational amplifier, the voltage sample resistance R6 of ground connection is also connected with between the source electrode of transistor and the negative-phase input of operational amplifier, node A is formed between transistor source and voltage sample resistance R6, Single Chip Microcomputer (SCM) system regulates the control voltage Vs of input operational amplifier normal phase input end according to the voltage signal gathered from node A, the divider resistance R5 of ground connection is connected with between described resistance R4 and the grid of transistor.
In a preferred embodiment of the present invention, comprise described Single Chip Microcomputer (SCM) system regulates operational amplifier output voltage values by tuning up or turn down control voltage Vs further, thus continuous print regulates the drive current of described LED.
In a preferred embodiment of the present invention, when comprising the output voltage values fluctuation of described operational amplifier further, the magnitude of voltage that series electric circuit negative feedback system regulates operational amplifier to export by oscillation suppression is extremely stable, thus regulates the drive current of described LED to constant.
In a preferred embodiment of the present invention, comprise described Single Chip Microcomputer (SCM) system further and there is single-chip microcomputer, A/D conversion chip, D/A conversion chip, the input that is made up of button, and the output display be made up of charactron.
In a preferred embodiment of the present invention, comprise described reference voltage circuit further and comprise power Vcc, voltage-stabiliser tube, voltage regulation resistance R1, biasing resistor R2, R3.
Usefulness of the present invention is: LED adjustable constant-flow source driving circuit of the present invention, utilize the control of Single Chip Microcomputer (SCM) system, voltage can be made on a large scale, accurately to change when regulating the voltage of operational amplifier normal phase input end, thus can stablize, continuous print controls curent change; Meanwhile, the introducing of series electric circuit negative feedback system, can make voltage stable output, thus stabilizing output current is to constant-current source.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is LED constant-current source circuit of the present invention;
Fig. 2 is the structured flowchart of Single Chip Microcomputer (SCM) system of the present invention.
Embodiment
In order to make those skilled in the art person understand the present invention program better, and enable above-mentioned purpose of the present invention, feature and advantage become apparent more, below in conjunction with embodiment and embodiment accompanying drawing, the present invention is further detailed explanation.
As shown in Figure 1, the invention provides a kind of LED adjustable constant-flow source driving circuit, comprise be made up of with transistor FET operational amplifier U1 series electric circuit negative feedback system 10, to be connected with the normal phase input end (+) of operational amplifier U1 and respectively to normal phase input end (+) the input reference voltage V of operational amplifier U1
rEFbe connected between the drain D of transistor FET and reference voltage circuit 20 with the reference voltage circuit 20 of control voltage Vs and Single Chip Microcomputer (SCM) system 30, LED, export as load.
Reference voltage circuit 20 comprises power Vcc, voltage-stabiliser tube D, voltage regulation resistance R1, biasing resistor R2, R3, voltage-stabiliser tube D selects model to be the three end adjustable shunt reference sources of TL431, from the continuously adjustable voltage stabilizing of 2.5V-36V, the normal phase input end (+) of the node input operational amplifier U1 between biasing resistor R2, R3.
The output of operational amplifier U1 is connected to the grid G of transistor FET by resistance R4, the divider resistance R5 of ground connection is connected with between the grid G of resistance R4 and transistor FET, after divider resistance R5 dividing potential drop, it forms pressure drop, make the gate source voltage Vgs of transistor FET effective, transistor FET conducting, the source electrode of transistor FET is connected to negative-phase input (-) the formation series electric circuit negative feedback system 10 of operational amplifier U1, when the output voltage values transient changing of operational amplifier U1, series electric circuit negative feedback system 10 is extremely stable by suppressing to change the magnitude of voltage regulating operational amplifier U1 to export, when normal phase input end (+) voltage constant of operational amplifier U1, due to degenerative existence, ensure that the constant of output voltage, and the drive current I of LED is linearly relevant with the output voltage of operational amplifier U1, thus make the electric current I flowing through LED load be constant current.
The model of the preferred operational amplifier U1 of the present invention is LM358, inside comprise two independently, high-gain, amplifier that internal frequency compensates, there is high-gain, advantage that offset voltage influence is little.The model of preferred crystal pipe FET is IRF830.
As a further improvement on the present invention, the voltage sample resistance R6 of ground connection is also connected with between the source S of transistor FET and the negative-phase input (-) of operational amplifier U1, node A is formed between the source S and voltage sample resistance R6 of transistor FET, Single Chip Microcomputer (SCM) system 30 tunes up or turns down the control voltage Vs of operational amplifier U1 normal phase input end (+) according to the voltage signal gathered from node A, thus tune up or turn down the output voltage values of operational amplifier U1, make current source circuit of the present invention become controlled tabilized current power supply.
As shown in Figure 2, described Single Chip Microcomputer (SCM) system 30 has the D/A conversion chip that single-chip microcomputer, the preferably model that preferred model is AT89C51 is the A/D conversion chip of ADC0809, preferred model is DAC0800, the input be made up of button, and the output display be made up of charactron.
Based on the above-mentioned composition structure of Single Chip Microcomputer (SCM) system 30, its control procedure is as follows: the analog voltage come from node A sampling is input to ADC0809, change through ADC0809, export 8 bits to one-chip machine port, 8 bits that single-chip microcomputer will obtain, convert 3 decimal numbers to, be presented on charactron, currency is compared with preset reference value simultaneously, made by software systems and adjust control accordingly, the computing of Single Chip Microcomputer (SCM) system software exports 8 bit binary value, essential oil DAC0800 realizes D/A conversion, export the normal phase input end (+) of operational amplifier U1 to, adjustment control voltage Vs, realize the adjustable output of drive current output current design.
So far, LED adjustable constant-flow source driving circuit of the present invention, utilizes the control of Single Chip Microcomputer (SCM) system, voltage can be made on a large scale, accurately to change when regulating the voltage of operational amplifier normal phase input end, thus can stablize, continuous print controls curent change; Meanwhile, the introducing of series electric circuit negative feedback system, can make voltage stable output, thus stabilizing output current is to constant-current source.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not limited by the examples; the change done under other any does not deviate from Spirit Essence of the present invention and principle, modification, substitute, combine, simplify the substitute mode that all should be equivalence, be included within protection scope of the present invention.Therefore, the protection range that protection scope of the present invention should define with claim is as the criterion.
Claims (5)
1. a LED adjustable constant-flow source driving circuit, comprise the operational amplifier that normal phase input end connects reference voltage circuit, the transistor that grid is coupled by resistance R4 and operational amplifier output terminal, described LED is connected between the drain electrode of transistor and reference voltage circuit, it is characterized in that: it also comprises the Single Chip Microcomputer (SCM) system being connected to operational amplifier normal phase input end, the source electrode of transistor is connected to the negative-phase input formation series electric circuit negative feedback system of operational amplifier, the voltage sample resistance R6 of ground connection is also connected with between the source electrode of transistor and the negative-phase input of operational amplifier, node A is formed between transistor source and voltage sample resistance R6, Single Chip Microcomputer (SCM) system regulates the control voltage Vs of input operational amplifier normal phase input end according to the voltage signal gathered from node A, the divider resistance R5 of ground connection is connected with between described resistance R4 and the grid of transistor.
2. LED adjustable constant-flow source driving circuit according to claim 1, is characterized in that: described Single Chip Microcomputer (SCM) system regulates the output voltage values of operational amplifier by tuning up or turn down control voltage Vs, thus continuous print regulates the drive current of described LED.
3. LED adjustable constant-flow source driving circuit according to claim 1, it is characterized in that: when the output voltage values of described operational amplifier fluctuates, the magnitude of voltage that series electric circuit negative feedback system regulates operational amplifier to export by oscillation suppression is extremely stable, thus regulates the drive current of described LED to constant.
4. LED adjustable constant-flow source driving circuit according to claim 2, is characterized in that: described Single Chip Microcomputer (SCM) system has single-chip microcomputer, A/D conversion chip, D/A conversion chip, the input that is made up of button, and the output display be made up of charactron.
5. LED adjustable constant-flow source driving circuit according to claim 1, is characterized in that: described reference voltage circuit comprises power Vcc, voltage-stabiliser tube, voltage regulation resistance R1, biasing resistor R2, R3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510054643.9A CN104602418A (en) | 2015-02-02 | 2015-02-02 | Adjustable constant flow source driving circuit for LED |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510054643.9A CN104602418A (en) | 2015-02-02 | 2015-02-02 | Adjustable constant flow source driving circuit for LED |
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| CN104602418A true CN104602418A (en) | 2015-05-06 |
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| CN201510054643.9A Pending CN104602418A (en) | 2015-02-02 | 2015-02-02 | Adjustable constant flow source driving circuit for LED |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106385734A (en) * | 2016-10-26 | 2017-02-08 | 杰华特微电子（杭州）有限公司 | Voltage sampling circuit |
| CN106793279A (en) * | 2016-12-13 | 2017-05-31 | 四川长虹电子部品有限公司 | A kind of adjustable constant current output power module and implementation method |
| CN107148121A (en) * | 2017-06-30 | 2017-09-08 | 苏州菲达旭微电子有限公司 | A kind of chop control linear switch constant current and constant power circuit |
| CN107479608A (en) * | 2017-09-18 | 2017-12-15 | 东莞博力威电池有限公司 | A kind of circuit for controlling output constant current |
| CN108093530A (en) * | 2016-04-29 | 2018-05-29 | 矽力杰半导体技术(杭州)有限公司 | Control circuit, control method and apply its linear LED drive circuit |
| CN112399676A (en) * | 2020-12-04 | 2021-02-23 | 欧普照明股份有限公司 | Constant current driving circuit, calibration method thereof and lighting device |
| CN112859980A (en) * | 2021-01-12 | 2021-05-28 | 东莞浩立自动化科技有限公司 | Constant current control system for intelligently detecting load and control method thereof |
| CN113485507A (en) * | 2021-07-07 | 2021-10-08 | 深圳东昇射频技术有限公司 | High-precision anti-noise multiplication control voltage-to-current method |
| CN113849028A (en) * | 2021-10-25 | 2021-12-28 | 杭州和利时自动化有限公司 | Current output type AO circuit |
| CN114300935A (en) * | 2021-12-28 | 2022-04-08 | 昂纳信息技术（深圳）有限公司 | Laser driving system, laser device, and driving method |
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| US20080238327A1 (en) * | 2007-03-30 | 2008-10-02 | Korea Advanced Institute Of Science And Technology | Amoled drive circuit using transient current feedback and active matrix driving method using the same |
| CN202396051U (en) * | 2011-12-20 | 2012-08-22 | 常熟卓辉光电科技有限公司 | Constant current driving circuit for high-power LED |
| CN204031528U (en) * | 2014-06-25 | 2014-12-17 | 宁夏博通卓润节能环保科技有限公司 | A kind of energy-conservation driving circuit of high-power LED lamp |
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2015
- 2015-02-02 CN CN201510054643.9A patent/CN104602418A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080238327A1 (en) * | 2007-03-30 | 2008-10-02 | Korea Advanced Institute Of Science And Technology | Amoled drive circuit using transient current feedback and active matrix driving method using the same |
| CN202396051U (en) * | 2011-12-20 | 2012-08-22 | 常熟卓辉光电科技有限公司 | Constant current driving circuit for high-power LED |
| CN204031528U (en) * | 2014-06-25 | 2014-12-17 | 宁夏博通卓润节能环保科技有限公司 | A kind of energy-conservation driving circuit of high-power LED lamp |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108093530A (en) * | 2016-04-29 | 2018-05-29 | 矽力杰半导体技术(杭州)有限公司 | Control circuit, control method and apply its linear LED drive circuit |
| CN106385734A (en) * | 2016-10-26 | 2017-02-08 | 杰华特微电子（杭州）有限公司 | Voltage sampling circuit |
| CN106385734B (en) * | 2016-10-26 | 2018-12-14 | 杰华特微电子（杭州）有限公司 | A kind of voltage sampling circuit |
| CN106793279B (en) * | 2016-12-13 | 2019-09-13 | 四川虹锐电工有限责任公司 | A kind of adjustable constant current output power module and implementation method |
| CN106793279A (en) * | 2016-12-13 | 2017-05-31 | 四川长虹电子部品有限公司 | A kind of adjustable constant current output power module and implementation method |
| CN107148121A (en) * | 2017-06-30 | 2017-09-08 | 苏州菲达旭微电子有限公司 | A kind of chop control linear switch constant current and constant power circuit |
| CN107479608A (en) * | 2017-09-18 | 2017-12-15 | 东莞博力威电池有限公司 | A kind of circuit for controlling output constant current |
| CN112399676A (en) * | 2020-12-04 | 2021-02-23 | 欧普照明股份有限公司 | Constant current driving circuit, calibration method thereof and lighting device |
| CN112399676B (en) * | 2020-12-04 | 2023-08-29 | 欧普照明股份有限公司 | Constant current driving circuit, calibration method thereof and lighting device |
| CN112859980A (en) * | 2021-01-12 | 2021-05-28 | 东莞浩立自动化科技有限公司 | Constant current control system for intelligently detecting load and control method thereof |
| CN113485507A (en) * | 2021-07-07 | 2021-10-08 | 深圳东昇射频技术有限公司 | High-precision anti-noise multiplication control voltage-to-current method |
| CN113849028A (en) * | 2021-10-25 | 2021-12-28 | 杭州和利时自动化有限公司 | Current output type AO circuit |
| CN114300935A (en) * | 2021-12-28 | 2022-04-08 | 昂纳信息技术（深圳）有限公司 | Laser driving system, laser device, and driving method |
| CN114300935B (en) * | 2021-12-28 | 2024-05-17 | 昂纳科技(深圳)集团股份有限公司 | Laser driving system, laser device, and laser driving method |
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Application publication date: 20150506 |
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