CN104768280A - Color temperature compensation method for LED lamp - Google Patents
Color temperature compensation method for LED lamp Download PDFInfo
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- CN104768280A CN104768280A CN201510031334.XA CN201510031334A CN104768280A CN 104768280 A CN104768280 A CN 104768280A CN 201510031334 A CN201510031334 A CN 201510031334A CN 104768280 A CN104768280 A CN 104768280A
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- string
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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, especially relate to a kind of color temperature compensating method that effectively can reduce the LED of colour temperature deviation.
Background technology
Along with the development of LED intelligent illumination, the brightness of LED, colour temperature, color, scene etc. can adopt various wireless or wired mode to control, and control to become day by day easy.But current people pay close attention to not enough the light quality of LED illumination and effect, and stroboscopic problem and the color temperature shift problem of LED do not cause enough attention.
Light modulation at present for LED adopts PWM pulse width modulation mode to realize usually, namely uses the break-make of a switch, regulates the PWM duty ratio of LED current, thus realize the adjustment of brightness.The adjustment of colour temperature normally adopts the LED particle mixed light of 2 road different-colours, namely adopts the LED particle of 6500K cool colour temperature and the warm colour temperature LED particle mixed light of 3000K, regulates the PWM of this 2 paths of LEDs respectively, realize the adjustment of colour temperature and brightness.But the LED current pulsation under PWM state is very large, in high frequency, electric current is from 0 to maximum in generating period saltus step, although due to visual lag, human eye perceives does not go out flicker, but the fluctuation of high frequency may affect biological stomodaeal nervous system, can cause the symptom such as dizziness, vomiting for a long time.High frequency camera shooting under this light also can find the phenomenon of LOF.
Chinese patent mandate publication number: CN102595722A, authorizes publication date on July 18th, 2012, discloses a kind of LED colour temperature regulation device, comprise adjuster and driver; Described adjuster comprises: colour temperature regulable control panel, for carrying out on/off and sending colour temperature conditioning signal for operator; And control signal generator, receive after colour temperature regulable control panel sends colour temperature conditioning signal and export corresponding control signal according to instruction; Described driver comprises: microprocessor, receives and comes from the control signal that control signal generator sends, by this control signal by analysis and send the PWM conditioning signal changing LED operating current after calculating; And constant-current driven module, according to the PWM conditioning signal that microprocessor provides, export constant LED operating current.The weak point of this invention is, LED Red Shift Phenomena can occur, and colour temperature deviation is larger.
Summary of the invention
Goal of the invention of the present invention is colour temperature in order to overcome the actual mixed light obtained of color temperature compensating method of the prior art and expect the deficiency that the colour temperature deviation that obtains is larger, provides a kind of color temperature compensating method that effectively can reduce the LED of colour temperature deviation.
To achieve these goals, the present invention is by the following technical solutions:
A kind of color temperature compensating method of LED, described LED comprises the single-chip microcomputer, filter circuit and 2 DC drivers that are electrically connected successively, also comprise the LED particle string A of the cool colour temperature be electrically connected respectively with 2 DC drivers and the LED particle string B of warm colour temperature, 2 groups of LED particle strings comprise the identical series LED particle of quantity, and single-chip microcomputer is electrically connected with computer by data wire; Described color temperature compensating method following steps:
(1-1) colour temperature setting LED particle string A is CCTc, and operating current is Ic; The colour temperature of LED particle string B is CCTw, and operating current is Iw;
Setting is CCT by obtaining colour temperature after LED particle string A and B mixed light, and the operating current of LED particle string A when luminous flux is the mixed light of φ is I '
c, the operating current of LED particle string B is I '
w;
(1-2) set Imax as the maximum operating currenbt of LED particle string A and B, store some to dim signal and color-temperature regulating signal in computer, and record I '
cwith I '
wvalue and the mapping table of dim signal and the right corresponding relation of color-temperature regulating signal;
Computer flows to dim signal and the color-temperature regulating signal pair of single-chip microcomputer by changing, the operating current Ic of LED particle string A is raised gradually by 0 to Imax, the output colour temperature CCTc of LED particle string A is detected with colour temperature measurement instrument, computer selecting at least 8 Ic and corresponding output colour temperature CCTc are utilized to form point (Ic, CCTc), the curve 1 exporting colour temperature and change with operating current Ic is drawn in a computer;
The operating current Iw of LED particle string B is raised gradually by 0 to Imax, the output colour temperature CCTw of LED particle string B is detected with colour temperature measurement instrument, computer selecting at least 8 Iw and corresponding output colour temperature CCTw are utilized to form point (Iw, CCTw), the curve 2 exporting colour temperature and change with operating current Iw is drawn in a computer;
(1-3) computer carries out linear fit to curve 1 and curve 2 respectively, obtains the linear fit formula CCTc=d corresponding with curve 1
1i
c+ d
2,
The linear fit formula CCTw=g corresponding with curve 2
1i
w+ g
2; Wherein, d
1, d
2, g
1, g
2be non-zero real number;
(1-4) after setting mixed light, the luminous flux of LED particle string A is Ф c, and the luminous flux of LED particle string B is Ф w,
Colour temperature CCT=(Ф c × CCTc+ Ф w × CCTw)/(Ф c+ Ф w) then after mixed light;
(1-5) computer utilizes the following formulae discovery I ' derived according to step (1-3) and (1-4)
cwith I '
w:
CCT＝(Фc×CCTc+Фw×CCTw)/φ，
Фc＝I′
c×ηc，Фw＝I′
w×ηw；
CCTc＝d
1I′
c+d
2，CCTw＝g
1I′
w+g
2；
Wherein, φ=Ф c+ Ф w, Ф c=Ic × η c, Ф w=Iw × η w, η c are the luminous light efficiency of the LED particle string A of setting, and η w is the luminous light efficiency of LED of the LED particle string B of setting;
(1-6) I ' is obtained
cwith I '
wafter, computer inquery relation table, obtains and I '
cwith I '
wcorresponding dim signal and color-temperature regulating signal to and flow 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, obtaining colour temperature is CCT, and luminous flux is the mixed light of φ.
Fig. 1 and Fig. 2 is respectively the colour temperature of experiment test brand LED 6500K and 3000K particle with operating current change curve, and as can be seen from Fig. 1 and Fig. 2, the colour temperature of LED particle string can change along with the change of the operating current of LED particle string; Visible, when operating current reduces, all can there is Red Shift Phenomena in the colour temperature of 2 kinds of LED particle strings, and the change of 6500KLED particle string is relatively larger.
In a light modulation color-temperature regulating system, it has been generally acknowledged 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 average of 2 kinds of LED particle colour contamination temperature; But in fact, because the colour temperature of LED particle string under different operating electric current can offset, therefore luminous flux weighted average is utilized to carry out color-temperature regulating, will cause the colour temperature after the mixed light that cannot obtain expecting, the colour temperature deviation that colour temperature and the expection of the actual mixed light obtained of common color temperature compensating method obtain is larger.
The present invention proposes a kind of color temperature compensating method of brand-new LED, utilizes the rule that the colour temperature of LED particle string can change along with the change of operating current, oppositely solves the colour temperature in order to reach expection, the operating current of the required work of LED particle string; Make LED particle string A according to operating current I '
cwork, LED particle string B is according to operating current I '
wwork, thus obtain expecting that colour temperature is CCT, luminous flux is the mixed light of φ.
The present invention has the rule utilizing the colour temperature of LED particle string can change along with the change of operating current, calculates the colour temperature in order to reach expection, the operating current of the required work of LED particle string; Thus after making mixed light the actual mixed light obtained colour temperature with expect the feature that the colour temperature deviation that obtains is less.
As preferably, in described LED particle string A, the specified colour temperature of each LED particle is 6500K, and the specified colour temperature of each LED particle of LED particle string B is 3000K.
As preferably, in described LED particle string A, the specified colour temperature of each LED particle is 6500K, and in LED particle string B, the specified colour temperature of each LED particle is 2700K.
As preferably, described η c is equal with η w.
As preferably, in described step (1-2), the operating current Ic of LED particle string A is raised by 0 to Imax gradually according to the step-length of 80 to 105mA.
As preferably, in described step (1-2), the operating current Iw of LED particle string B is raised by 0 to Imax gradually according to the step-length of 90 to 105mA.
Therefore, the present invention has following beneficial effect:
(1) rule utilizing the colour temperature of LED particle string can change along with the change of operating current, calculates the colour temperature in order to reach expection, the operating current of the required work of LED particle string;
(2) after making mixed light the actual mixed light obtained colour temperature with expect that the colour temperature deviation that obtains is less;
(3) effectively stroboscopic is reduced.
Accompanying drawing explanation
Fig. 1 is the curve chart that a kind of colour temperature of 6500K LED particle string of the present invention changes with operating current;
Fig. 2 is the curve chart that a kind of colour temperature of 3000K LED particle string 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 LED of the present invention.
In figure: single-chip microcomputer 1, filter circuit 2, DC driver 3, LED particle 4.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Embodiment is as shown in Figure 4 a kind of color temperature compensating method of LED, LED comprises the single-chip microcomputer 1, filter circuit 2 and 2 DC drivers 3 that are electrically connected successively, also comprise the LED particle string A of the cool colour temperature be electrically connected respectively with 2 DC drivers and the LED particle string B of warm colour temperature, include 2 series LED particles 4 in 2 groups of LED particle strings, single-chip microcomputer is electrically connected with computer by data wire;
As shown in Figure 3, color temperature compensating method following steps:
The colour temperature of the LED particle string A of setting 6500K cool colour temperature is CCTc, and operating current is Ic; The colour temperature of the LED particle string B of 1000K warm colour temperature is CCTw, and operating current is Iw;
Setting is CCT by obtaining colour temperature after LED particle string A and B mixed light, and the operating current of LED particle string A when luminous flux is the mixed light of φ 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, in computer, store 2000 dim signals and color-temperature regulating signal pair, and record I '
cwith I '
wvalue and the mapping table of dim signal and the right corresponding relation of color-temperature regulating signal;
Computer flows to dim signal and the color-temperature regulating signal pair of single-chip microcomputer by changing, the operating current Ic of LED particle string A is raised gradually by 0 to Imax, the output colour temperature CCTc of LED particle string A is detected with colour temperature measurement instrument, computer selecting 8 Ic and corresponding output colour temperature CCTc are utilized to form point (Ic, CCTc), the curve 1 that output colour temperature as shown in Figure 1 changes with operating current Ic is drawn in a computer;
The operating current Iw of LED particle string B is raised gradually by 0 to Imax, the output colour temperature CCTw of LED particle string B is detected with colour temperature measurement instrument, computer selecting 8 Iw and corresponding output colour temperature CCTw are utilized to form point (Iw, CCTw), the curve 2 that output colour temperature as shown in Figure 2 changes with operating current Iw is drawn in a computer; ;
Step 200, obtains 2 linear fit formula
Computer carries out linear fit to curve 1 and curve 2 respectively, obtains the linear fit formula CCTc=0.331I corresponding with curve 1
c+ 6557,
The linear fit formula CCTw=0.06I corresponding with curve 2
w+ 2956;
Step 300, obtains the colour temperature formula after mixed light
After setting mixed light, the luminous flux of LED particle string A is Ф c, and the luminous flux of LED particle string B is Ф w,
Colour temperature CCT=(Ф c × CCTc+ Ф w × CCTw)/(Ф c+ Ф w) then after mixed light;
Step 400, calculates the LED particle string operating current of colour temperature after the mixed light in order to reach expection
Computer utilizes the following formulae discovery I ' derived according to step 200 and 300
cwith I '
w:
CCT＝(Фc×CCTc+Фw×CCTw)/φ，
Фc＝I′
c×ηc，Фw＝I′
w×ηw；
CCTc＝0.331I′
c+6557，CCTw＝0.06I′
w+2956；
Wherein, φ=Ф c+ Ф w, Ф c=Ic × η c, Ф w=Iw × η w, η c are the luminous light efficiency of the LED particle string A of setting, and η w is the luminous light efficiency of LED of the LED particle string B of setting;
Step 500, obtaining colour temperature is CCT, and luminous flux is the mixed light of φ
Obtain I '
cwith I '
wafter, computer inquery relation table, obtains and I '
cwith I '
wcorresponding dim signal and color-temperature regulating signal to and flow 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, obtaining colour temperature is CCT, and luminous flux is the mixed light of φ.
In the present embodiment, in LED particle string A, the specified colour temperature of each LED particle is 6500K, the specified colour temperature of each LED particle of LED particle string B is that 3000K, η c with η w is equal, and the operating current Ic of LED particle string A is raised by 0 to Imax gradually according to the step-length of 100mA; The operating current Iw of LED particle string B is raised by 0 to Imax gradually according to the step-length of 95mA.
Common color temperature compensating method is as follows:
The specified colour temperature of setting 6500K LED particle string A is CCT1, and operating current I1, luminous flux is the specified colour temperature of Ф 1,3000K LED particle string B is CCT2, and operating current I2, luminous flux is Ф 2.Colour temperature then after mixed light is the weighted average of 2 kinds of colour temperature luminous fluxes:
CCT＝(Ф1×CCT1+Ф2×CCT2)/(Ф1+Ф2)
Wherein Ф 1=I1 × η 1, Ф 2=I2 × η 2, η 1 is the luminous light efficiency of first group of LED, and η 2 is the luminous light efficiency of second group of LED.
Expect the expection colour temperature after the mixed light of CCT, then regulate the value of I1 and I2, equation is set up, but the colour temperature of CCT just after mixed light ideally, the actual colour temperature that obtains and expect the error having 200K between colour temperature CCT.
As shown in Figure 4, input voltage vin drives 2 LED particle string A and B through 2 DC drivers; Single-chip microcomputer accepts external dimmer signal and toning signal, and decoding union, exports 2 road pwm control signals, and PWM1 is through R1, C1, R2 filtering, and PWM2, through R3, C2, R4 filtering, obtains direct voltage DIM1, and DIM2 gives 2 DC drivers respectively.2 drivers can export certain direct current, driving LED particle string steady operation according to the analog voltage of input.The duty ratio of the output PWM1 of single-chip microcomputer, PWM2 is and I '
cwith I '
wcorresponding, thus have modified the color temperature shift impact caused due to operating current change.
Error between the colour temperature of actual output after mixed light of the present invention and expection colour temperature CCT is 5K; Therefore the present invention's actual mixed light obtained after there is mixed light colour temperature with expect the feature that the colour temperature deviation that obtains is less.
Should be understood that the present embodiment is only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
Claims (6)
1. the color temperature compensating method of a LED, it is characterized in that, described LED comprise be electrically connected successively single-chip microcomputer (1), filter circuit (2) and 2 DC drivers (3), also comprise the LED particle string A of the cool colour temperature be electrically connected respectively with 2 DC drivers and the LED particle string B of warm colour temperature, 2 groups of LED particle strings comprise the identical series LED particle (4) of quantity, and single-chip microcomputer is electrically connected with computer by data wire; Described color temperature compensating method following steps:
(1-1) colour temperature setting LED particle string A is CCTc, and operating current is Ic; The colour temperature of LED particle string B is CCTw, and operating current is Iw;
Setting is CCT by obtaining colour temperature after LED particle string A and B mixed light, and the operating current of LED particle string A when luminous flux is the mixed light of φ is I '
c, the operating current of LED particle string B is I '
w;
(1-2) set Imax as the maximum operating currenbt of LED particle string A and B, store some to dim signal and color-temperature regulating signal in computer, and record I '
cwith I '
wvalue and the mapping table of dim signal and the right corresponding relation of color-temperature regulating signal;
Computer flows to dim signal and the color-temperature regulating signal pair of single-chip microcomputer by changing, the operating current Ic of LED particle string A is raised gradually by 0 to Imax, the output colour temperature CCTc of LED particle string A is detected with colour temperature measurement instrument, computer selecting at least 8 Ic and corresponding output colour temperature CCTc are utilized to form point (Ic, CCTc), the curve 1 exporting colour temperature and change with operating current Ic is drawn in a computer;
The operating current Iw of LED particle string B is raised gradually by 0 to Imax, the output colour temperature CCTw of LED particle string B is detected with colour temperature measurement instrument, computer selecting at least 8 Iw and corresponding output colour temperature CCTw are utilized to form point (Iw, CCTw), the curve 2 exporting colour temperature and change with operating current Iw is drawn in a computer;
(1-3) computer carries out linear fit to curve 1 and curve 2 respectively, obtains the linear fit formula CCTc=d corresponding with curve 1
1i
c+ d
2,
The linear fit formula CCTw=g corresponding with curve 2
1i
w+ g
2; Wherein, d
1, d
2, g
1, g
2be non-zero real number;
(1-4) after setting mixed light, the luminous flux of LED particle string A is Φ c, and 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 utilizes the following formulae discovery I ' derived according to step (1-3) and (1-4)
cwith I '
w:
CCT＝(Φc×CCTc+Φw×CCTw)/φ，
Φc＝I′
c×ηc，Φw＝I′
w×ηw；
CCTc＝d
1I′
c+d
1，CCTw＝g
1I′
w+g
2；
Wherein, φ=Φ c+ Φ w, Φ c=Ic × η c, Φ w=Iw × η w, η c are the luminous light efficiency of the LED particle string A of setting, and η w is the luminous light efficiency of LED of the LED particle string B of setting;
(1-6) I ' is obtained
cwith I '
wafter, computer inquery relation table, obtains and I '
cwith I '
wcorresponding dim signal and color-temperature regulating signal to and flow 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, obtaining colour temperature is CCT, and luminous flux is the mixed light of φ.
2. the color temperature compensating method of LED according to claim 1, is characterized in that, in described LED particle string A, the specified colour temperature of each LED particle 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, in described LED particle string A, the specified colour temperature of each LED particle 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, described η c is equal with η w.
5. the color temperature compensating method of LED according to claim 1, is characterized in that, in described step (1-2), the operating current Ic of LED particle string A is raised by 0 to Imax gradually 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, in described step (1-2), the operating current Iw of LED particle string B is raised by 0 to Imax gradually according to the step-length of 90 to 105mA.
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| CN106851916A (en) * | 2017-03-06 | 2017-06-13 | 广东德洛斯照明工业有限公司 | A kind of LED dims shunt method |
| CN107027213A (en) * | 2017-03-06 | 2017-08-08 | 广东德洛斯照明工业有限公司 | A kind of intelligent constant luminance output control method |
| CN107027214A (en) * | 2017-03-10 | 2017-08-08 | 广东德洛斯照明工业有限公司 | A kind of lamp power automatic correcting method |
| CN107995729A (en) * | 2017-11-28 | 2018-05-04 | 成都世纪光合作用科技有限公司 | A kind of light mixing method of LED color light sources controllable brightness adjustable range |
| CN109963392A (en) * | 2019-02-27 | 2019-07-02 | 泉州信息工程学院 | A kind of control method of intelligent colour temperature control desk lamp |
| CN114375082A (en) * | 2022-03-21 | 2022-04-19 | 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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| CN106851916A (en) * | 2017-03-06 | 2017-06-13 | 广东德洛斯照明工业有限公司 | A kind of LED dims shunt method |
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| 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 |
| CN109963392A (en) * | 2019-02-27 | 2019-07-02 | 泉州信息工程学院 | A kind of control method of intelligent colour temperature control desk lamp |
| 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 |
| CN114375082A (en) * | 2022-03-21 | 2022-04-19 | 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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