CN104768280B - Color temperature compensation method for LED lamp - Google Patents
Color temperature compensation method for LED lamp Download PDFInfo
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Abstract
The invention discloses a color temperature compensation method for an LED lamp. The law that the color temperatures of LED particle strings can be varied along with the variation of working currents is used for conducting reverse solution in order to obtain an expected color temperature and the working currents needed by the LED particle strings. The LED particle string A works according to the working current I'c, the LED particle string B works according to the working current I'w, and accordingly mixed light with the expected color temperature being CCT and the luminous flux being phi is obtained. The color temperature compensation method for the LED lamp has the advantage that the deviation of the actually-obtained color temperature of the mixed light after light mixing and the expected color temperature is small, and thus the strobe is effectively lowered.
Description
Technical field
The present invention relates to field of LED illumination, mends more particularly, to a kind of colour temperature of LED that can effectively reduce colour temperature deviation
Compensation method.
Background technology
With the development of LED intelligent illumination, the brightness of LED, colour temperature, color, scene etc. can using various wireless or
Wired mode is controlled, and control becomes increasingly easy.However, current people are paid close attention to also not to the light quality of LED illumination and effect
Enough, the stroboscopic problem and color temperature shift problem of LED do not cause enough attention.
Light modulation currently for LED is generally realized using PWM pulse width modulation modes, i.e., is switched on-off with one, adjusted
The PWM duty cycle of section LED current, so that realize the regulation of brightness.The regulation of colour temperature is typically with the LED of 2 road different-colours
Granule mixed light, i.e., using LED particle and the warm colour temperature LED particle mixed light of 3000K of 6500K cool colour temperature, adjust this 2 tunnel respectively
The PWM of LED, realizes the regulation of colour temperature and brightness.However, the LED current pulsation under PWM state is very big, in high frequency, electric current from
0 arrives maximum in generating period saltus step, although due to visual lag, human eye does not feel flicker, but the fluctuation of high frequency may
Biological sympathetic nervous system is affected, the symptoms such as dizziness, vomiting can be caused for a long time.High frequency camera shooting under this light can also be sent out
The phenomenon of existing LOF.
Chinese patent mandate publication number：CN102595722A, authorizes publication date on July 18th, 2012, discloses a kind of LED
Colour temperature regulation device, including actuator and driver；The actuator includes：Colour temperature adjusts control panel, for carrying out power supply
Break-make and colour temperature Regulate signal is sent for operator；And control signal generator, receive colour temperature regulation control panel and send
According to the corresponding control signal of instruction output after colour temperature Regulate signal；The driver includes：Microprocessor, reception come from control
The control signal is sent by analysis and after calculating and changes LED operation electric current by the control signal that signal generator processed sends
PWM Regulate signals；And constant-current driven module, according to the PWM Regulate signals that microprocessor is provided, export constant LED operation
Electric current.The weak point of the invention is that LED can occur Red Shift Phenomena, and colour temperature deviation is larger.
The content of the invention
The goal of the invention of the present invention is for the mixed light for overcoming color temperature compensating method of the prior art to actually obtain
A kind of colour temperature deficiency larger with the expected colour temperature deviation for obtaining, there is provided colour temperature of the LED that can effectively reduce colour temperature deviation
Compensation method.
To achieve these goals, the present invention is employed the following technical solutions：
A kind of color temperature compensating method of LED, single-chip microcomputer that the LED includes being sequentially connected electrically, filter circuit and 2
DC driver, also includes LED of the LED particle string A of the cool colour temperature and warm colour temperature being electrically connected with 2 DC drivers
Grain string B, 2 groups of LED particle strings include quantity identical series LED granule, and single-chip microcomputer is by data wire and calculating mechatronics；
The color temperature compensating method comprises the steps：
(1-1) colour temperature of LED particle string A is set as CCTc, operating current is Ic；The colour temperature of LED particle string B is CCTw,
Operating current is Iw；
Set colour temperature is obtained as CCT by after LED particle string A and B mixed light, LED particle when luminous flux is the mixed light of φ
The operating current of string A is I 'c, the operating current of LED particle string B is I 'w；
(1-2) set Imax as LED particle string A and B maximum operating currenbt, be stored with computer some to dim signal
With color-temperature regulating signal, and record I 'cWith I 'wValue and dim signal and color-temperature regulating signal pair corresponding relation corresponding relation
Table；
Computer is conveyed to the dim signal and color-temperature regulating signal pair of single-chip microcomputer by changing, and makes the work of LED particle string A
Electric current Ic is gradually risen by 0 to Imax, detects output colour temperature CCTc of LED particle string A with colour temperature measurement instrument, is selected using computer
Take at least 8 Ic and corresponding output colour temperature CCTc constitutes point (Ic, CCTc), output colour temperature is drawn in a computer with work electricity
The curve 1 of stream Ic changes；
Make the operating current Iw of LED particle string B be gradually risen by 0 to Imax, LED particle string B is detected with colour temperature measurement instrument
Output colour temperature CCTw, constitute point (Iw, CCTw) using at least 8 Iw of computer selecting and corresponding output colour temperature CCTw,
The curve 2 that output colour temperature changes with operating current Iw is drawn in computer；
(1-3) computer carries out linear fit to curve 1 and curve 2 respectively, obtains public with 1 corresponding linear fit of curve
Formula CCTc=d1Ic+d2,
With 2 corresponding linear fit formula CCTw=g of curve1Iw+g2；Wherein, d1, d2, g1, g2It is non-zero real number；
(1-4) luminous flux of LED particle string A after mixed light is set as Φ c, the luminous flux of LED particle string B is Φ w,
Colour temperature CCT=(Φ c × CCTc+ Φ w × CCTw)/(Φ c+ Φ w) then after mixed light；
(1-5) computer calculates I ' using the following formula derived according to step (1-3) and (1-4)cWith I 'w：
CCT=(Φ c × CCTc+ Φ w × CCTw)/φ,
Φ c=I 'c× η c, Φ w=I 'w×ηw；
CCTc=d1I′c+d2, CCTw=g1I′w+g2；
Wherein, φ=Φ c+ Φ w, Φ c=Ic × η c, Φ w=Iw × η w, η c are the luminous light of the LED particle string A of setting
Effect, η w are the luminous light efficiencies of LED of the LED particle string B of setting；
(1-6) obtain I 'cWith I 'wAfterwards, computer inquery relation table, obtains and I 'cWith I 'wCorresponding dim signal and tune
Color temperature signal to and be conveyed to single-chip microcomputer, make LED particle string A according to operating current I 'cWork, LED particle string B is according to work electricity
Stream I 'wWork, obtains colour temperature for CCT, mixed light of the luminous flux for φ.
Fig. 1 and Fig. 2 is respectively the colour temperature of experiment test brand LED 6500K and 3000K granule to be changed with operating current
Curve, the colour temperature that can be seen that LED particle string by Fig. 1 and Fig. 2 can change with the change of the operating current of LED particle string；
It can be seen that, when operating current reduces, the colour temperature of 2 kinds of LED particle strings can occur Red Shift Phenomena, 6500KLED granules string change phase
To bigger.
Dim in color-temperature regulating system at one, it is generally recognized that the colour temperature (for specified colour temperature) under different operating currents is
Constant, then the colour temperature after mixed light is the luminous flux weighted mean of 2 kinds of LED particle colour contamination temperature；But in fact, due to LED
Colour temperature of the grain string under different operating electric current can shift, and carry out color-temperature regulating hence with luminous flux weighted average, it will cause
The colour temperature after expected mixed light cannot be obtained, colour temperature and the expection of the mixed light that common color temperature compensating method is actually obtained are obtained
Colour temperature deviation it is larger.
The present invention proposes a kind of color temperature compensating method of brand-new LED, can be with work using the colour temperature of LED particle string
The change of electric current and the rule that changes, reversely solve the work electricity in order to reach work required for expected colour temperature, LED particle string
Stream；LED particle string A is made according to operating current I 'cWork, LED particle string B is according to operating current I 'wWork, so as to be expected
Colour temperature is CCT, and luminous flux is the mixed light of φ.
The present invention has the rule that can change with the change of operating current using the colour temperature of LED particle string, calculates
To in order to reach expected colour temperature, the operating current of work required for LED particle string；So that the mixing actually obtained after mixed light
The less feature of colour temperature deviation that the colour temperature of light is obtained with expection.
Preferably, the specified colour temperature of each LED particle is 6500K in the LED particle string A, LED particle string B's is every
The specified colour temperature of individual LED particle is 3000K.
Preferably, the specified colour temperature of each LED particle is 6500K in the LED particle string A, it is every in LED particle string B
The specified colour temperature of individual LED particle is 2700K.
Preferably, the η c are equal with η w.
Preferably, in step (1-2) the operating current Ic of LED particle string A according to the step-length of 80 to 105mA by 0
Gradually rise to Imax.
Preferably, in step (1-2) the operating current Iw of LED particle string B according to the step-length of 90 to 105mA by 0
Gradually rise to Imax.
Therefore, the present invention has the advantages that：
(1) rule that can be changed with the change of operating current using the colour temperature of LED particle string, is calculated to reach
The operating current of work to required for expected colour temperature, LED particle string；
(2) the colour temperature deviation that the colour temperature of the mixed light actually obtained after making mixed light is obtained with expection is less；
(3) effectively reduce stroboscopic.
Description of the drawings
Fig. 1 is the curve chart that a kind of colour temperature of the 6500K LED particle strings of the present invention changes with operating current；
Fig. 2 is the curve chart that a kind of colour temperature of the 3000K LED particle strings of the present invention changes with operating current；
Fig. 3 is a kind of flow chart of embodiments of the invention；
Fig. 4 is a kind of circuit diagram of the LED of the present invention.
In figure：Single-chip microcomputer 1, filter circuit 2, DC driver 3, LED particle 4.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
Embodiment as shown in Figure 4 is a kind of color temperature compensating method of LED, and LED includes the monolithic being sequentially connected electrically
Machine 1, filter circuit 2 and 2 DC drivers 3, also include LED of cool colour temperature be electrically connected with 2 DC drivers
The LED particle string B of grain string A and warm colour temperature, includes 2 series LED granules 4 in 2 groups of LED particle strings, single-chip microcomputer passes through data
Line and calculating mechatronics；
As shown in figure 3, color temperature compensating method comprises the steps：
The colour temperature of LED particle string A of 6500K cool colour temperature is set as CCTc, operating current is Ic；The LED of 1000K warm colour temperature
The colour temperature of granule string B is CCTw, and operating current is Iw；
Set colour temperature is obtained as CCT by after LED particle string A and B mixed light, LED particle when luminous flux is the mixed light of φ
The operating current of string A is I 'c, the operating current of LED particle string B is I 'w；
Step 100, draws the curve that colour temperature changes with operating current
If Imax is the maximum operating currenbt of LED particle string A and B, be stored with computer 2000 dim signals and tune
Color temperature signal pair, and record I 'cWith I 'wValue and dim signal and color-temperature regulating signal pair corresponding relation mapping table；
Computer is conveyed to the dim signal and color-temperature regulating signal pair of single-chip microcomputer by changing, and makes the work of LED particle string A
Electric current Ic is gradually risen by 0 to Imax, detects output colour temperature CCTc of LED particle string A with colour temperature measurement instrument, is selected using computer
Take 8 Ic and corresponding output colour temperature CCTc constitutes point (Ic, CCTc), draw output colour temperature as shown in Figure 1 in a computer
With the curve 1 that operating current Ic changes；
Make the operating current Iw of LED particle string B be gradually risen by 0 to Imax, LED particle string B is detected with colour temperature measurement instrument
Output colour temperature CCTw, constitute point (Iw, CCTw) using 8 Iw of computer selecting and corresponding output colour temperature CCTw, calculating
The curve 2 that output colour temperature as shown in Figure 2 changes with operating current Iw is drawn in machine；；
Step 200, obtains 2 linear fit formula
Computer carries out linear fit to curve 1 and curve 2 respectively, obtains and 1 corresponding linear fit formula of curve
CCTc=0.331Ic+ 6557,
With 2 corresponding linear fit formula CCTw=0.06I of curvew+2956；
Step 300, obtains the colour temperature formula after mixed light
The luminous flux of LED particle string A after mixed light is set as Φ c, the luminous flux of LED particle string B is Φ w,
Colour temperature CCT=(Φ c × CCTc+ Φ w × CCTw)/(Φ c+ Φ w) then after mixed light；
Step 400, is calculated the LED particle string operating current in order to reach colour temperature after expected mixed light
Computer calculates I ' using the following formula derived according to step 200 and 300cWith I 'w：
CCT=(Φ c × CCTc+ Φ w × CCTw)/φ,
Φ c=I 'c× η c, Φ w=I 'w×ηw；
CCTc=0.331I 'c+ 6557, CCTw=0.06I 'w+2956；
Wherein, φ=Φ c+ Φ w, Φ c=Ic × η c, Φ w=Iw × η w, η c are the luminous light of the LED particle string A of setting
Effect, η w are the luminous light efficiencies of LED of the LED particle string B of setting；
Step 500, obtains colour temperature for CCT, mixed light of the luminous flux for φ
Obtain I 'cWith I 'wAfterwards, computer inquery relation table, obtains and I 'cWith I 'wCorresponding dim signal and color-temperature regulating letter
Number to and be conveyed to single-chip microcomputer, make LED particle string A according to operating current I 'cWork, LED particle string B is according to operating current I 'wWork
Make, colour temperature is obtained for CCT, mixed light of the luminous flux for φ.
In the present embodiment, in LED particle string A the specified colour temperature of each LED particle be 6500K, LED particle string B each
The specified colour temperature of LED particle is 3000K, and η c are equal with η w, and the operating current Ic of LED particle string A is according to the step-length of 100mA by 0
Gradually rise to Imax；The operating current Iw of LED particle string B is gradually risen by 0 to Imax according to the step-length of 95mA.
Common color temperature compensating method is as follows：
The specified colour temperature of 6500K LED particle string A is set as CCT1, operating current I1, luminous flux are Φ 1,3000K LED
The specified colour temperature of granule string B is CCT2, and operating current I2, luminous flux are Φ 2.Then the colour temperature after mixed light is 2 kinds of colour temperature luminous fluxes
Weighted average：
CCT=(Φ 1 × CCT1+, 2 × CCT2 of Φ)/(Φ 1+ Φ 2)
The luminous light efficiency of wherein Φ 1=I1 × η 1, Φ 2=I2 × η 2, η 1 for first group of LED, the sending out for second group of LED of η 2
Light light efficiency.
Expected colour temperature after the mixed light of CCT to be expected, then adjust the value of I1 and I2, sets up equation, but CCT
Simply the colour temperature after mixed light ideally, has the error of 200K between the colour temperature for actually obtaining and expected colour temperature CCT.
As shown in figure 4, input voltage vin drives 2 LED particles string A and B through 2 DC drivers；Single-chip microcomputer receives
External dimmer signal and toning signal, decode union, export 2 road pwm control signals, and PWM1 is filtered through R1, C1, R2,
PWM2 obtains DC voltage DIM1 through R3, C2, R4 filtering, and DIM2 gives 2 DC drivers respectively.2 drivers being capable of basis
The analog voltage of input exports certain DC current, drives LED particle string steady operation.The output PWM1 of single-chip microcomputer, PWM2
Dutycycle be and I 'cWith I 'wCorresponding, affect so as to have modified the color temperature shift caused as operating current changes.
Error after mixed light of the present invention between the colour temperature of reality output and expected colour temperature CCT is 5K；Therefore the present invention has
The less feature of colour temperature deviation that the colour temperature of the mixed light actually obtained after mixed light is obtained with expection.
It should be understood that the present embodiment is only illustrative of the invention and is not intended to limit the scope of the invention.In addition, it is to be understood that
After having read the content of instruction of the present invention, those skilled in the art can be made various changes or modifications to the present invention, these etc.
Valency form equally falls within the application appended claims limited range.
Claims (6)
1. a kind of color temperature compensating method of LED, is characterized in that, the LED includes single-chip microcomputer (1), the filter being sequentially connected electrically
Wave circuit (2) and 2 DC drivers (3), also include the LED particle of cool colour temperature being electrically connected with 2 DC drivers
The LED particle string B of string A and warm colour temperature, 2 groups of LED particle strings include quantity identical series LED granule (4), and single-chip microcomputer passes through
Data wire and calculating mechatronics；The color temperature compensating method comprises the steps：
(1-1) colour temperature of LED particle string A is set as CCTc, operating current is Ic；The colour temperature of LED particle string B is CCTw, is worked
Electric current is Iw；
Set colour temperature is obtained as CCT by after LED particle string A and B mixed light, LED particle string A's when luminous flux is the mixed light of φ
Operating current is I 'c, the operating current of LED particle string B is I 'w；
(1-2) set Imax as LED particle string A and B maximum operating currenbt, be stored with computer some to dim signal and tune
Color temperature signal, and record I 'cWith I 'wValue and dim signal and color-temperature regulating signal pair corresponding relation mapping table；
Computer is conveyed to the dim signal and color-temperature regulating signal pair of single-chip microcomputer by changing, and makes the operating current of LED particle string A
Ic is gradually risen by 0 to Imax, detects output colour temperature CCTc of LED particle string A with colour temperature measurement instrument, using computer selecting extremely
Few 8 Ic and corresponding output colour temperature CCTc constitute point (Ic, CCTc), draw output colour temperature in a computer with operating current Ic
The curve 1 of change；
The operating current Iw of LED particle string B is gradually risen by 0 to Imax, detect that LED particle string B's is defeated with colour temperature measurement instrument
Go out colour temperature CCTw, point (Iw, CCTw) is constituted using at least 8 Iw of computer selecting and corresponding output colour temperature CCTw, calculating
The curve 2 that output colour temperature changes with operating current Iw is drawn in machine；
(1-3) computer carries out linear fit to curve 1 and curve 2 respectively, obtains and 1 corresponding linear fit formula of curve
CCTc=d1Ic+d2,
With 2 corresponding linear fit formula CCTw=g of curve1Iw+g2；Wherein, d1, d2, g1, g2It is non-zero real number；
(1-4) luminous flux of LED particle string A after mixed light is set as Φ c, the luminous flux of LED particle string B is Φ w,
Colour temperature CCT=(Φ c × CCTc+ Φ w × CCTw)/(Φ c+ Φ w) then after mixed light；
(1-5) computer calculates I ' using the following formula derived according to step (1-3) and (1-4)cWith I 'w：
CCT=(Φ c × CCTc+ Φ w × CCTw)/φ,
Φ c=I 'c× η c, Φ w=I 'w×ηw；
CCTc=d1I′c+d2, CCTw=g1I′w+g2；
Wherein, φ=Φ c+ Φ w, Φ c=Ic × η c, Φ w=Iw × η w, η c be setting LED particle string A luminous light efficiency, η
W is the luminous light efficiencies of LED of the LED particle string B of setting；
(1-6) obtain I 'cWith I 'wAfterwards, computer inquery relation table, obtains and I 'cWith I 'wCorresponding dim signal and color-temperature regulating letter
Number to and be conveyed to single-chip microcomputer, make LED particle string A according to operating current I 'cWork, LED particle string B is according to operating current I 'wWork
Make, colour temperature is obtained for CCT, mixed light of the luminous flux for φ.
2. the color temperature compensating method of LED according to claim 1, is characterized in that, each LED in the LED particle string A
The specified colour temperature of granule is 6500K, and the specified colour temperature of each LED particle of LED particle string B is 3000K.
3. the color temperature compensating method of LED according to claim 1, is characterized in that, each LED in the LED particle string A
The specified colour temperature of granule is 6500K, and in LED particle string B, the specified colour temperature of each LED particle is 2700K.
4. the color temperature compensating method of LED according to claim 1, is characterized in that, the η c are equal with η w.
5. the color temperature compensating method of LED according to claim 1, is characterized in that, LED particle in step (1-2)
The operating current Ic of string A is gradually risen by 0 to Imax according to the step-length of 80 to 105mA.
6. the color temperature compensating method of LED according to claim 1, is characterized in that, LED particle in step (1-2)
The operating current Iw of string B is gradually risen by 0 to Imax according to the step-length of 90 to 105mA.
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| CN107027213B (en) * | 2017-03-06 | 2018-11-30 | 广东德洛斯照明工业有限公司 | A kind of intelligence constant luminance output control method |
| CN106851916B (en) * | 2017-03-06 | 2018-10-12 | 广东德洛斯照明工业有限公司 | A kind of LED light modulations shunt method |
| CN107027214B (en) * | 2017-03-10 | 2019-09-27 | 广东优尼克智能照明科技有限公司 | A kind of lamp power automatic correcting method |
| CN107995729B (en) * | 2017-11-28 | 2019-11-12 | 成都世纪光合作用科技有限公司 | A kind of light mixing method of LED color light source controllable brightness adjustable range |
| CN109963392B (en) * | 2019-02-27 | 2021-04-16 | 泉州信息工程学院 | Control method of intelligent color temperature control desk lamp |
| CN114375082B (en) * | 2022-03-21 | 2022-06-21 | 广州光联电子科技有限公司 | LED light source dimming method and dimming system |
| TWI809997B (en) * | 2022-07-28 | 2023-07-21 | 大陸商北京集創北方科技股份有限公司 | Color temperature compensation method for LED display drive, LED display drive chip and LED display device |
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| CN101697654B (en) * | 2009-10-30 | 2013-02-27 | 中山大学 | Correlated color temperature and color rendering index self-calibration circuit of LED light source consisting of light of multiple colors |
| CN201925771U (en) * | 2010-12-16 | 2011-08-10 | 唐万华 | Lamp with adjustable luminous flux and color temperature |
| CN104272870B (en) * | 2012-05-04 | 2016-09-28 | 奥斯兰姆施尔凡尼亚公司 | To the method and apparatus of solid state light emitter light modulation and corresponding luminaire and system |
| TW201412187A (en) * | 2012-09-14 | 2014-03-16 | Helio Optoelectronics Corp | LED lamp structure driven by double current and double current driving method thereof |
| TWI538555B (en) * | 2012-12-24 | 2016-06-11 | 鴻海精密工業股份有限公司 | A color temperature adjustment method and an illumination device using the method thereof |
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