CN103458575A - Digital linear dimming method for high-power LED - Google Patents
Digital linear dimming method for high-power LED Download PDFInfo
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Abstract
The invention discloses a digital linear dimming method for a high-power LED and belongs to the technical field of dimming methods. The digital linear dimming method for the high-power LED is characterized by comprising the following steps that firstly, a single-chip microcomputer receives a potentiometer signal, a current signal, a voltage signal and an LED temperature signal and conducts analog-to-digital conversion; secondly, based on the current signal, the voltage signal and the temperature signal, a luminance compensation coefficient A is calculated; thirdly, a lumen value L is calculated, and an output luminance value Lch which is generated after temperature compensation is calculated according to the luminance compensation coefficient A; fourthly, the current Io which needs to be supplied is obtained according to the Lch; fifthly, whether a sampled current signal is equal to the Io or not is judged, if yes, a result is output to a PWM control circuit, and if not, the result is adjusted and then output to the PWM control circuit. The digital linear dimming method for the high-power LED is convenient to operate, accurate in dimming, and suitable for dimming of the high-power LED.
Description
Technical field
The present invention relates to a kind of light-dimming method, more particularly, relate in particular to a kind of great power LED digital linear light-dimming method.
Background technology
The output brightness of LED lamp is except outside the Pass the material technology with LED lamp itself has, also relevant with the junction temperature of LED lamp with operating current.Same producer, isonomic LED lamp, the factor that affects output brightness is mainly the junction temperature of operating current and the LED lamp of LED lamp.The LED operating current is larger, and output brightness is higher, but the variation of brightness and electric current is nonlinear.Simultaneously, the higher LED output brightness of junction temperature is lower.The operating current of regulating LED when radiating condition is constant can cause the junction temperature of LED to change, and this is also to affect LED brightness to change one of not linear factor.
The adder and substracter circuit that current LED adjusting control circuit mainly is comprised of operational amplifier, this control circuit can only accomplish output current following potentiometer resistance value variation and change.If potentiometer is linear potentiometer, output current is also linear current, and directly ignores the non-linear of other feedback circuits.This regulative mode is fairly simple, technology maturation, but to the non-linear relation of brightness and electric current, and the impact that the LED junction temperature is exported brightness can not be eliminated, thereby while causing regulator potentiometer, nonlinear variation appears in the brightness of LED lamp, this makes troubles to some specific use occasion.
Summary of the invention
The object of the invention is to for above-mentioned the deficiencies in the prior art, a kind of easy to operate, light modulation great power LED digital linear light-dimming method accurately is provided.
Technical scheme of the present invention is achieved in that a kind of great power LED digital linear light-dimming method, wherein the method comprises the steps: that (1) arranges pwm control circuit, current sampling circuit and voltage sampling circuit on the circuit between power supply and LED, near the set temperature detection probe LED solder joint, pwm control circuit connects single-chip microcomputer simultaneously, and single-chip microcomputer connects linear potentiometer; (2) single-chip microcomputer reception potentiometer signal, current signal, voltage signal and LED temperature signal carry out analog-to-digital conversion; (3) calculate luminance compensation coefficient A according to current signal, voltage signal and LED temperature signal; (4) according to potentiometer calculated signals output lumen value L, then calculate the output brightness value Lch set after temperature-compensating in conjunction with luminance compensation coefficient A; (5) looking in program according to the Lch value that digitized electric current and LED light table obtains should be to the electric current I o of confession; (6) judge whether the current signal that sampling obtains equals Io, if so, result is exported to pwm control circuit, if not, pwm control circuit exported to after adjusting.
In above-mentioned great power LED digital linear light-dimming method, described step (2) is specially: single-chip microcomputer is the microprocessor with above 12 the high-speed ADC analog to digital converters in 4 roads and 12 DAC digital-to-analogue converters; The ADC analog to digital converter receives potentiometer signal, current signal, voltage signal and LED temperature signal to carry out analog-to-digital conversion and is converted into corresponding R, I, V and Tc, and the adjusting resistance that wherein R is linear potentiometer, equal the coefficient that the potentiometer signal value is multiplied by setting; The current value that I is actual output, the current signal that equals the ADC collection is multiplied by the coefficient of setting; The magnitude of voltage that V is circuit output, the voltage signal that equals the ADC collection is multiplied by the coefficient of setting; Tc is near the temperature LED pad, by temperature measuring probe, obtains.
In above-mentioned great power LED digital linear light-dimming method, described step (3) is specially: (3a) according to current signal and voltage signal rated output P, P=V*I; (3b) calculate junction temperature T, △ T=Rthe*P, T=Tc+ △ T; (3c) look into digitized LED junction temperature and LED light table in program and obtain the brightness output percentage Ach under junction temperature T, then calculate luminance compensation coefficient A, A=Ach+ △ A; Wherein: the temperature difference that △ T is LED junction temperature and measurement point; The thermal resistance that Rthe is LED, check according to the LED databook; Ach is brightness under different junction temperatures output percentage, according to the junction temperature T acquisition of tabling look-up; △ A is the luminance compensation correction factor, according to the joint temperature scope of actual use, selects △ A, makes A=1 under the benchmark junction temperature.
In above-mentioned great power LED digital linear light-dimming method, described step (4) is specially: the computing the resistor value output lumen value L, the L=(Lmax/Rmax that (4a) according to linear potentiometer, regulate) * R; (4b) the output brightness value Lch set after the accounting temperature compensation, Lch=L/A; Wherein, the LED output maximum brightness value of Lmax for setting, according to the databook of LED with set with needs and LED radiating condition; The maximum that Rmax is resistance, the potentiometer maximum value of choosing; A is the luminance compensation coefficient, and the expansion joint temperature changes the impact on brightness output; Constant for realizing actual output brightness value L, be subject to saving the impact that temperature changes, the Lch set point is dynamic variable quantity.
After the present invention adopts said method, by on the basis of original current feedback loop, increase the temperature measuring probe of voltage sampling circuit and detection LED lamp junction temperature, and the signal each circuit fed back by the single-chip microcomputer with efficient disposal ability carries out analyzing and processing, thereby LED lamp brightness output nonlinear when realize eliminating variations injunction temperature and regulating electric current, reach the purpose of accurate light modulation.
The accompanying drawing explanation
Below in conjunction with the embodiment in accompanying drawing, the present invention is described in further detail, but do not form any limitation of the invention.
Fig. 1 is electrical block diagram of the present invention;
Fig. 2 is workflow schematic diagram of the present invention;
Fig. 3 is the circuit theory schematic diagram of a kind of specific embodiment of the present invention;
Fig. 4 is that LED lamp brightness output of the present invention changes schematic diagram with potentiometer resistance.
Embodiment
Consult shown in Fig. 1, it is the electrical block diagram of realizing great power LED digital linear light-dimming method of the present invention, comprise that sequentially circuit is connected to filtering and protective circuit 3, pwm control circuit 4 and the output filter circuit 5 between DC power supply 1 and LED light source 2, simultaneously, pwm control circuit 4 circuit are connected with single-chip microcomputer 6, and described single-chip microcomputer 6 circuit are connected with linear potentiometer 7; Circuit between described output filter circuit 5 and LED light source 2 is provided with current sample amplifying circuit 8, and described current sample amplifying circuit 8 is connected with single-chip microcomputer 6.Single-chip microcomputer described in the present embodiment 6 is the microprocessor with above 12 the high-speed ADC analog to digital converters in 4 roads and 12 DAC digital-to-analogue converters; Described linear potentiometer 7 is connected with microprocessor by the ADC analog to digital converter.Simultaneously, at LED light source 2 pad sides, be provided with temperature sensor 9, described temperature sensor 9 is connected with microprocessor by the ADC analog to digital converter.The weld point temperature obtained by microprocessor processes temperature sensor 9, thereby the problem of LED brightness output nonlinear while realizing eliminating the LED variations injunction temperature.Be connected with voltage sampling circuit 10 on the circuit between output filter circuit 5 and LED light source 2, described voltage sampling circuit 10 is connected with microprocessor by the ADC analog to digital converter.The magnitude of voltage obtained by microprocessor processes voltage sampling circuit 10, thereby the problem of LED brightness output nonlinear while realizing eliminating the adjusting electric current.
Consult shown in Fig. 2, a kind of great power LED digital linear light-dimming method of the present invention, the method comprises the steps:
(1) pwm control circuit, current sample amplifying circuit and voltage sampling circuit are set on the circuit between DC power supply and LED light source, near the set temperature detection probe LED solder joint, pwm control circuit connects single-chip microcomputer simultaneously, and single-chip microcomputer connects linear potentiometer;
(2) single-chip microcomputer is the microprocessor with above 12 the high-speed ADC analog to digital converters in 4 roads and 12 DAC digital-to-analogue converters, the preferred STM32F051K4 processor of the micro-processing in the present embodiment; The ADC analog to digital converter receives potentiometer signal, current signal, voltage signal and LED temperature signal to carry out analog-to-digital conversion and is converted into corresponding R, I, V and Tc, and the adjusting resistance that wherein R is linear potentiometer, equal the coefficient that the potentiometer signal value is multiplied by setting; The current value that I is actual output, the current signal that equals the ADC collection is multiplied by the coefficient of setting; The magnitude of voltage that V is circuit output, the voltage signal that equals the ADC collection is multiplied by the coefficient of setting; Tc is near the temperature LED pad, by temperature measuring probe, obtains;
(3) calculate luminance compensation coefficient A according to current signal, voltage signal and LED temperature signal; Be specially: (3a) according to current signal and voltage signal rated output P, P=V*I; (3b) calculate junction temperature T, T=Tc+ △ T, △ T=Rthe*P; (3c) look into digitized LED junction temperature and LED light table in program and obtain the brightness output percentage Ach under junction temperature T, then calculate luminance compensation coefficient A, A=Ach+ △ A; Wherein: the temperature difference that △ T is LED junction temperature and measurement point; The thermal resistance that Rthe is LED, check according to the LED databook; Ach is brightness under different junction temperatures output percentage, according to the junction temperature T acquisition of tabling look-up; △ A is the luminance compensation correction factor, according to the joint temperature scope of actual use, selects △ A, makes A=1 under the benchmark junction temperature;
(4) according to potentiometer calculated signals output lumen value L, then calculate the output brightness value Lch set after temperature-compensating in conjunction with luminance compensation coefficient A; Be specially: the computing the resistor value output lumen value L, the L=(Lmax/Rmax that (4a) according to linear potentiometer, regulate) * R; (4b) the output brightness value Lch set after the accounting temperature compensation, Lch=L/A; Wherein, the LED output maximum brightness value of Lmax for setting, according to the databook of LED with set with needs and LED radiating condition; The maximum that Rmax is resistance, the potentiometer maximum value of choosing; A is the luminance compensation coefficient, and the expansion joint temperature changes the impact on brightness output; Constant for realizing actual output brightness value L, be subject to saving the impact that temperature changes, the Lch set point is dynamic variable quantity;
(5) looking into according to the Lch value that electric current in the LED handbook and LED light table obtain should be to the electric current I o of confession;
(6) judge whether the current signal that sampling obtains equals Io, if so, do not regulate PWM and control output, if not, regulate DAC output and change the pwm control circuit pulsewidth.
Consult shown in Fig. 3, the circuit working principle schematic of great power LED digital linear light-dimming method of the present invention, selected the STM32F051K4 processor as single-chip microcomputer 6 in the specific embodiment of the invention, and power supply chip is used integrated power supply chip MP1593.VDD, model and the power supply of VDDA power circuit and operational amplifier are chosen as required flexibly.
The specific works principle is as follows:
The direct current of DC5V～23V is inputted PWM controller MP1593 after the filter circuit of reverse-connection protection circuit, current foldback circuit and electromagnetic compatibility.MP1593 is integrated step-down switching power supply chip, can control the duty ratio of MP1593 by the input of controlling the FB pin, thereby reaches the purpose of adjusting the output current size.What MP1593 exported is the electric current of high frequency, need to after rectifying and wave-filtering, just obtain supplying with the direct current of LED.
Sample circuit comprises that 4 parts form, and are respectively.
(1) Voltage Feedback sampling: gather voltage signal from the anode of LED power supply output port, after voltage follower U1B, use electric resistance partial pressure, then access the ADC input pin (the 7th pin) of STM32F051K4.
(2) current feedback: the copper-manganese resistance that seals in 0.1 Europe in output loop changes current signal into voltage signal, the ADC input pin (the 6th pin) of input STM32F051K4 after operational amplifier U1A amplifies 16 times.
(3) temperature feedback: the signal of LM35 temperature measuring probe, from binding post J3 place in circuit, is received the ADC input pin (the 9th pin) of STM32F051K4 after RC filtering.
(4) potentiometer signals collecting: the potentiometer signal, from binding post J2 place in circuit, is received the ADC input pin (the 9th pin) of STM32F051K4 after RC filtering.
32-bit microprocessor STM32F051K4 effect is that the 4 road signals that ADC is collected carry out computing (process of processing is shown in Fig. 3), and the result of computing is used for controlling pwm chip MP1583 from the DAC output of the 14th pin of STM32F051K4.The FLASH programming input interface that J1 is STM32F051K4.
Consulting shown in Fig. 4, is to utilize light-dimming method of the present invention, and the linear change schematic diagram of linear potentiometer resistance and LED lamp output brightness (lumen), can find out, can realize the linearity output of LED lamp brightness by the resistance of linear regulation potentiometer.
Above-described embodiment is preferably execution mode of the present invention; but embodiments of the present invention are not restricted to the described embodiments; and other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (4)
1. a great power LED digital linear light-dimming method, it is characterized in that, the method comprises the steps: that (1) arranges pwm control circuit, current sampling circuit and voltage sampling circuit on the circuit between power supply and LED, near the set temperature detection probe LED solder joint, pwm control circuit connects single-chip microcomputer simultaneously, and single-chip microcomputer connects linear potentiometer; (2) single-chip microcomputer reception potentiometer signal, current signal, voltage signal and LED temperature signal carry out analog-to-digital conversion; (3) calculate luminance compensation coefficient A according to current signal, voltage signal and LED temperature signal; (4) according to potentiometer calculated signals output lumen value L, then calculate the output brightness value Lch set after temperature-compensating in conjunction with luminance compensation coefficient A; (5) looking into according to the Lch value that electric current in the LED handbook and LED light table obtain should be to the electric current I o of confession; (6) judge whether the current signal that sampling obtains equals Io, if so, do not regulate PWM and control output, if not, regulate DAC output and change the pwm control circuit pulsewidth.
2. great power LED digital linear light-dimming method according to claim 1, is characterized in that, described step (2) is specially: single-chip microcomputer is the microprocessor with above 12 the high-speed ADC analog to digital converters in 4 roads and 12 DAC digital-to-analogue converters; The ADC analog to digital converter receives potentiometer signal, current signal, voltage signal and LED temperature signal to carry out analog-to-digital conversion and is converted into corresponding R, I, V and Tc, and the adjusting resistance that wherein R is linear potentiometer, equal the coefficient that the potentiometer signal value is multiplied by setting; The current value that I is actual output, the current signal that equals the ADC collection is multiplied by the coefficient of setting; The magnitude of voltage that V is circuit output, the voltage signal that equals the ADC collection is multiplied by the coefficient of setting; Tc is near the temperature LED pad, by temperature measuring probe, obtains.
3. great power LED digital linear light-dimming method according to claim 1, is characterized in that, described step (3) is specially: (3a) according to current signal and voltage signal rated output P, P=V*I; (3b) calculate junction temperature T, T=Tc+ △ T, △ T=Rthe*P; (3c) look into digitized LED junction temperature and LED light table in the LED program and obtain the brightness output percentage Ach under junction temperature T, then calculate luminance compensation coefficient A, A=Ach+ △ A; Wherein: the temperature difference that △ T is LED junction temperature and measurement point; The thermal resistance that Rthe is LED, check according to the LED databook; Ach is brightness under different junction temperatures output percentage, according to the junction temperature T acquisition of tabling look-up; △ A is the luminance compensation correction factor, according to the joint temperature scope of actual use, selects △ A, makes A=1 under the benchmark junction temperature.
4. great power LED digital linear light-dimming method according to claim 1, is characterized in that, described step (4) is specially: the computing the resistor value output lumen value L, the L=(Lmax/Rmax that (4a) according to linear potentiometer, regulate) * R; (4b) the output brightness value Lch set after the accounting temperature compensation, Lch=L/A; Wherein, the LED output maximum brightness value of Lmax for setting, according to the databook of LED with set with needs and LED radiating condition; The maximum that Rmax is resistance, the potentiometer maximum value of choosing; A is the luminance compensation coefficient, and the expansion joint temperature changes the impact on brightness output; Constant for realizing actual output brightness value L, be subject to saving the impact that temperature changes, the Lch set point is dynamic variable quantity.
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| CN103596325A (en) * | 2013-08-22 | 2014-02-19 | 广西奥顺仪器有限公司 | Large power LED digital linear light modulation system |
| CN104536438A (en) * | 2014-12-31 | 2015-04-22 | 杭州师范大学 | Stroboscopic theory based needle selector detecting system and method |
| CN104955236A (en) * | 2015-06-30 | 2015-09-30 | 艾佛森（深圳）科技有限公司 | Method and device for controlling LED lamps |
| CN105430814A (en) * | 2015-12-30 | 2016-03-23 | 北京经纬恒润科技有限公司 | LED lamp temperature compensation control method, device and system |
| CN107302814A (en) * | 2016-04-15 | 2017-10-27 | 英飞凌科技奥地利有限公司 | Temperature protection circuit for light emitting diode |
| CN108337761A (en) * | 2017-01-19 | 2018-07-27 | 苏州速迈医疗设备有限公司 | A kind of light-dimming method and light adjusting system of great power LED |
| TWI674815B (en) * | 2018-10-01 | 2019-10-11 | 龍華科技大學 | An adaptive LED driver |
| CN115297590A (en) * | 2022-10-10 | 2022-11-04 | 杭州罗莱迪思科技股份有限公司 | Color non-shift control method for dimming lamp and application thereof |
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| TWI674815B (en) * | 2018-10-01 | 2019-10-11 | 龍華科技大學 | An adaptive LED driver |
| CN115297590A (en) * | 2022-10-10 | 2022-11-04 | 杭州罗莱迪思科技股份有限公司 | Color non-shift control method for dimming lamp and application thereof |
| CN115297590B (en) * | 2022-10-10 | 2023-02-14 | 杭州罗莱迪思科技股份有限公司 | Color non-shift control method for dimming lamp and application thereof |
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