CN105430790B - Light mixing method for LED light source and linear lighting lamp - Google Patents
Light mixing method for LED light source and linear lighting lamp Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention provides a light mixing method for an LED light source, which comprises the following steps: A. calculating and expecting color according to an expecting color temperatureThe white balance brightness ratio alpha of the LED light source corresponding to the temperature to the RGB of the three primary colors is as follows: beta: gamma; B. obtaining the maximum current I of the LED light sourcemaxThe following corresponds to the maximum luminance values of the three primary colors RGB: l isRmax、LGmax、LBmax(ii) a C. According to LRmax、LGmax、LBmaxAnd white balance luminance ratio α: beta: gamma calculates the desired brightness value of the LED light source corresponding to the three primary colors RGB: l isR、LG、LB(ii) a D. Acquiring a desired color of the LED light source and color coordinates (a, b, c) corresponding to the desired color; E. calculating the duty ratio D corresponding to the three primary colors RGB according to the color coordinates (a, b, c)R、DG、DB(ii) a F. Respectively calculate LRout＝LR*DR、LGout＝LG*DG、LBout＝LB*DBTo obtain the output brightness L of the LED light source corresponding to the RGB three primary colorsRout、LGout、LBout. Therefore, under the condition that the color coordinate parameters and the luminous flux parameters of the LED lamp beads do not need to be known, the light mixing operation can still be completed according to the requirement.
Description
Technical Field
The invention relates to the field of lighting lamps, in particular to a light mixing method for an LED light source and a linear lighting lamp.
Background
The LED three-primary-color light mixing refers to adjusting the brightness of an R-LED (red LED), a G-LED (green LED) and a B-LED (blue LED) to mix light, so that various illumination colors are generated. As can be seen from the commission international de l illumination (CIE) chromaticity diagram, the color of light is related to the proportional amounts r (λ), g (λ), B (λ) of the three primary colors R, G and B, and satisfies the condition r (λ) + g (λ) + B (λ) ═ 1. Therefore, the method not only can realize brightness adjustment by changing the current of the LED, but also can change the proportion of the three primary color lumens according to the preference of a user to obtain color adjustment of the LED.
On the other hand, since human eyes have visual inertia, when the frequency of the periodic light signal is higher than the critical flicker frequency, the eye perceives the periodic light signal as a constant light, and according to Talbot (Talbot) law, the visual brightness is:
Lare all made of＝1/T∫T，
D＝L(t)dt
Where l (T) is the actual brightness of the periodic light signal, called the brightness function, and T is the period of the light signal. For periodic light signals above the critical flicker frequency, the visual brightness perceived by the eye is the average of the actual brightness. When the luminance function L (t) is constant L, the visual luminance of the periodic light signal is:
Lare all made of＝t/(TL)＝DL
Where t is the time of the light stimulus in each cycle and D is the duty cycle. By adjusting the duty cycle D, the control of the LED brightness can be achieved. This control scheme is called a PWM scheme. The PWM mode is flexible to control and easy to digitize, and is the main mode of LED light mixing at present.
However, when the above LEDs are used for mixing light, it is usually faced that the color coordinate parameters and the luminous flux parameters of the corresponding LED lamp beads cannot be obtained. In the face of this, mixing cannot be performed due to the lack of known conditions.
Therefore, a novel light mixing mode is needed, and light mixing operation can still be completed according to needs under the condition that color coordinate parameters and luminous flux parameters of the LED lamp beads do not need to be known.
Disclosure of Invention
In order to overcome the above technical drawbacks, an object of the present invention is to provide a light mixing method for an LED light source and a linear lighting fixture, wherein a user can complete RGB color mixing operation on the lamp side to achieve a correct color mixing effect.
The invention discloses a light mixing method for an LED light source, which comprises the following steps:
A. calculating a white balance brightness ratio alpha of three primary colors RGB corresponding to the LED light source corresponding to a desired color temperature according to the desired color temperature: beta: gamma;
B. obtaining the maximum current I of the LED light sourcemaxThe following corresponds to the maximum luminance values of the three primary colors RGB: l isRmax、LGmax、LBmax；
C. According to said LRmax、LGmax、LBmaxAnd white balance luminance ratio α: beta: gamma calculating the expected brightness value of the LED light source corresponding to the three primary colors RGB: l isR、LG、LB；
D. Acquiring a desired color of the LED light source and color coordinates (a, b, c) corresponding to the desired color;
E. calculating the duty ratio D of the corresponding three primary colors RGB according to the color coordinates (a, b, c)R、DG、DB；
F. Respectively calculate LRout＝LR*DR、LGout＝LG*DG、LBout＝LB*DBTo obtain the output brightness L of the LED light source corresponding to the RGB three primary colorsRout、LGout、LBout。
Preferably, in step a, the white balance luminance ratio α: beta: γ is obtained by referring to the color temperature-to-white balance luminance ratio correspondence table or by the RGB white balance luminance ratio formula.
Preferably, in step C, the desired luminance value: l isR、LG、LBThe ratio of (A) to (B): l isR：LG：LB＝α：β：γ。
Preferably, in step C, the L isR＝LRmaxThen the desired luminance value is calculated: l isR、LG、LB。
Preferably, when said L isG＞LGmaxAnd/or LB＞LBmaxWhen the L is not in the rangeG＝LRmaxThen the desired luminance value is calculated: l isR、LG、LB。
Preferably, when said L isB＞LBmaxWhen the L is not in the rangeB＝LBmaxThen the desired luminance value is calculated: l isR、LG、LB。
Preferably, in step E, according to DR＝a/255、DG＝b/255、DBCalculating said D as c/255R、DG、DB。
Preferably, the desired color temperature of the LED light source is 6000K.
Preferably, between step C and step D, the following steps are further included:
c', according to the maximum current Imax, maximum brightness value: l isRmax、LGmax、LBmaxAnd desired luminance value: l isR、LG、LBCalculating the full load current I of the LED light source corresponding to the RGBR、IG、IB。
The invention also discloses a linear lighting lamp which comprises a control unit, wherein the control unit adjusts the output brightness of the LED light source in the linear lighting lamp according to the light mixing method.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1. the upper computer and the modules of the linear lighting lamp adopting the light mixing method can mix light without considering parameters of the LED light source, and can complete light mixing operation only according to three primary colors of expected colors;
2. the input data volume is less, and the light mixing calculation is quicker.
Drawings
Fig. 1 is a flow chart of a light mixing method according to a preferred embodiment of the present invention.
Detailed Description
The advantages of the invention are further illustrated in the following description of specific embodiments in conjunction with the accompanying drawings.
The invention discloses a novel light mixing method for mixing light on the basis of using other parameters except color coordinate parameters and luminous flux parameters of LED lamp beads during light mixing, and a user can achieve the effect of performing correct light mixing and sorting on RGB only by inputting color coordinate parameters of expected colors (the parameters are changed according to the purpose of the user and belong to inevitably available data).
Referring to fig. 1, the novel light mixing method includes the following steps:
-step a: calculating a white balance brightness ratio alpha of three primary colors RGB corresponding to the LED light source corresponding to a desired color temperature according to the desired color temperature: beta: gamma;
in the step a, the desired color temperature is the color of the light emitted by the LED light source in the full-on state, for example, the color temperature of about 3000K is called warm white, and about 6000K is called normal white or cold white, which is adjusted by the user according to the user's own needs or determined according to the own properties of the LED light source. Based on the known desired color temperature, the user can look up a table or obtain a white balance luminance ratio α under the three primary color RGB standard corresponding to the desired color temperature according to the RGB white balance luminance ratio formula (described in detail below): beta: and gamma. For example, in one embodiment, the desired color temperature is 6000K, which is a familiar color temperature value to those skilled in the art, and the white balance luminance ratio under the RGB standard is 3:6:1, that is, to obtain the desired color temperature 6000K, the LED light source emits light with a luminance ratio of red light, green light, and blue light of 3:6:1 based on the RGB standard. If the desired color temperature is not common, an accurate white balance luminance ratio cannot be found in the look-up table, and the white balance luminance ratio can be calculated by an RGB white balance luminance ratio formula, which specifically comprises:
1. firstly, a formula of color coordinate value (x, y) is obtained through a color temperature value (CCT)
x＝-1.4438*(CCT/10000)*(CCT/10000)*(CCT/10000)+2.80131*(CCT/10000)*(CCT/10000)-1.99416*(CCT/10000)+0.82221；
y＝-0.22411+2.53421*x-2.50948*x*x；
2. Obtaining the mixed light percentage (f) of RGB three-color lamp beads from the color coordinate values (x, y)R,fG,fB)，
Wherein f isR,fG,fBIs the percentage of light intensity of R, G, B participating in the mixed light, Xt，YtIs a target color coordinate value, XR，YR，XG，YG，XB，YBColor coordinate values of standard R, G and B colors;
f obtained by final calculationR,fG,fBIs the white balance luminance ratio for RGB.
-a step B of obtaining the maximum current I of the LED light sourcemaxThe following corresponds to the maximum luminance values of the three primary colors RGB: l isRmax、LGmax、LBmax；
Maximum current (rated current) ImaxAnd the maximum brightness value corresponding to the three primary colors RGB: l isRmax、LGmax、LBmaxCan be read directly from the specification of the LED light source. For example, in this embodiment, the specification of the LED light source shows that the factory brightness value of the R bead is 500mcd, the factory brightness value of the G bead is 950mcd, and the factory brightness value of the B bead is 250 mcd. The outgoing brightness value is an average brightness value, and the LED light source is a three-in-one lamp bead body or a separately arranged lamp bead body of the R lamp bead, the G lamp bead and the B lamp bead.
-step C: according to said LRmax、LGmax、LBmaxAnd white balance luminance ratio α: beta: gamma calculating the expected brightness value of the LED light source corresponding to the three primary colors RGB: l isR、LG、LB；
Under the condition that the brightness values of the R lamp bead, the G lamp bead and the B lamp bead are not more than the specification standard, calculating to obtain the expected brightness value of the RGB which correspondingly meets the expected color temperature. But for the desired luminance value L in the calculation due to the white balance luminance ratioR、LG、LBIs limited (e.g. by L)R：LG：LBα: beta: γ), so that the way of calculation differs in different embodiments, specifically, detailed in the following three embodiments:
①LRmax＝500mcd、LGmax＝950mcd、LBmax＝250mcd，α：β：γ＝3:6:1
calculating the desired brightness value: l isR、LG、LBAccording to α: beta: γ ═ 3:6:1, with LRmaxCalculated L on the basis of 500mcdG＝1000mcd、LB167mcd, when found the calculated LG＞LGmaxTherefore, the calculation is incorrect and instead takes place with LGmaxCalculated L based on 950mcdR＝474mcd，LBCalculate the resulting L158 mcdR＜LRmax，LB＜LBmaxAnd the requirements are met.
②LRmax＝450mcd、LGmax＝950mcd、LBmax＝250mcd，α：β：γ＝3:6:1
Calculating the desired brightness value: l isR、LG、LBAccording to α: beta: γ is 3:6:1, toLRmaxCalculated L450 mcd as referenceG＝900mcd、LBCalculate the resulting L150 mcdG＜LGmax，LB＜LBmaxAnd the requirements are met.
③LRmax＝800mcd、LGmax＝950mcd、LBmax＝250mcd，α：β：γ＝3:6:1
Calculating the desired brightness value: l isR、LG、LBAccording to α: beta: γ ═ 3:6:1, with LRmaxWhen 800mcd is taken as a reference, L obtained after calculationG＝1600mcd、LB267mcd, at which point the calculated L is foundG＞LGmaxAnd L isB＞LBmaxTherefore, the calculation is incorrect and instead takes place with LGmaxCalculated L based on 950mcdR＝474mcd，LBCalculate the resulting L158 mcdR＜LRmax，LB＜LBmaxAnd the requirements are met.
The three embodiments described above are merely examples, LRmax、LGmax、LBmaxThe specific value of (A) is subject to the actual condition.
Known from the above three embodiments, according to LRmax、LGmax、LBmaxAnd white balance luminance ratio α: beta: gamma calculates the desired brightness value of the LED light source corresponding to the three primary colors RGB: l isR、LG、LBAccording to different LRmax、LGmax、LBmaxAnd α: beta: γ, which is also calculated differently. Therefore, in a preferred embodiment, to increase the light mixing speed, the following logic is used:
first with LR＝LRmaxFor the reference calculation, the calculated L is judgedGWhether or not less than or equal to LGmax，LBWhether or not less than or equal to LBmax；
If L isG＞LGmaxAnd/or LB＞LBmaxWhen is, with LG＝LRmaxFor the reference calculation, the calculated L is judgedRWhether or not less than or equal to LRmax，LBWhether or not less than or equal to LBmax；
If L isB＞LBmaxWhen is, with LB＝LBmaxFor the baseline calculation, calculate LR、LB。
It should be noted that L is calculated in the above stepsG、LR、LBL calculated after the last stepR、LBIt is inevitable to satisfy: l isR≤LRmaxAnd LG≤LGmax。
Preferably, after the step C is performed, a step C' of calculating a desired luminance value: l isR、LG、LBThereafter, to achieve the desired brightness value in the LED light source: l isR、LG、LBAnd the full load current I of R lamp bead, G lamp bead and B lamp bead is required to be set for the constant current drive of the power supplyR、IG、IBThe specific setting algorithm is as follows:
IR＝LR/LRmax*Imax、IG＝LG/LGmax*Imax、IB＝LB/LBmax*Imax。
obtain the above full load current IR、IG、IBThen, when the PWM output is full high, the constant current driven and input by the corresponding R lamp bead, G lamp bead and B lamp bead is the above full load current IR、IG、IB。
-a step D: acquiring a desired color of the LED light source and color coordinates (a, b, c) corresponding to the desired color;
the user inputs color coordinates (a, b, c) of a desired color, for example, color coordinates (255,0,122) of a light red under the RGB standard, and the user inputs the data to the host computer.
-a step E: calculating the duty ratio D corresponding to the three primary colors RGB according to the color coordinates (a, b, c)R、DG、DB；
PWM mixing has been widely used in mixing light, and therefore, it is necessary to calculate the duty ratio according to the color coordinates (a, b, c) of the desired color by:
DR＝a/255、DG＝b/255、DB＝c/255。
-a step F: respectively calculate LRout＝LR*DR、LGout＝LG*DG、LBout＝LB*DBTo obtain the output brightness L of the LED light source corresponding to the RGB three primary colorsRout、LGout、LBout；
When R lamp bead, G lamp bead and B lamp bead have the output brightness LRout、LGout、LBoutAnd then, the mixed light mixed by the LED light source can meet the expected color temperature and the expected color, and finally, the mixed light effect is achieved.
The following embodiments are described in detail in the embodiments, in which the light mixing process of the light mixing method is as follows:
the desired color temperature of the LED light source selected by the user is 6000K, the white balance brightness ratio is 3:6:1, and the maximum current I ismax20mA, the maximum brightness value L of R lamp pearl, G lamp pearl and B lamp pearlRmax＝500mcd、LGmax＝950mcd、LBmax250 mcd. Then corresponding to the white balance brightness ratio, obtaining the expected brightness value: l isR＝474mcd、LG＝950cmd、LB158mcd to and the full load current of the R lamp pearl, G lamp pearl and B lamp pearl that correspond with the desired luminance value: i isR＝474/500*20＝18.96mA、IG＝950/950*20＝950mA、IB158/250 × 20 × 12.64 mA. The user then calculates the output PWM duty cycle, expressed in three primary colors RGB (255,0,122), based on a desired color of light red: dR＝255/255＝100％、DG＝0/255＝0％、DB122/255-50%. Finally, calculate LRout＝LR*DR＝474*100％＝474mcd、LGout＝LG*DG＝950*0％＝0mcd、LBout＝LB*DB158 × 50% ═ 79mcd, thereby the final mixed light effect that is corresponding luminance and corresponding with expected colour temperature and expected colour output for R lamp pearl, G lamp pearl and B lamp pearl.
After the light mixing method is adopted, the light mixing method can be applied to lighting lamps such as linear lighting lamps. The linear lighting lamp comprises a control unit, wherein the control unit can be arranged in an upper computer of the linear lighting lamp and performs light mixing calculation by the light mixing method so as to adjust the output brightness of the LED light source in the linear lighting lamp. Therefore, even if the color coordinate parameters and the luminous flux parameters of the LED lamp beads of the linear lighting lamp cannot be obtained, a user can input data into an upper computer or a control unit of the linear lighting lamp, and color mixing arrangement is carried out on RGB (red, green and blue) so as to achieve a correct color mixing effect.
It should be noted that the embodiments of the present invention have been described in terms of preferred embodiments, and not by way of limitation, and that those skilled in the art can make modifications and variations of the embodiments described above without departing from the spirit of the invention.
Claims (10)
1. A light mixing method for an LED light source is characterized by comprising the following steps:
A. calculating a white balance brightness ratio alpha of three primary colors RGB corresponding to the LED light source corresponding to a desired color temperature according to the desired color temperature: beta: gamma;
B. obtaining the maximum current I of the LED light sourcemaxThe following corresponds to the maximum luminance values of the three primary colors RGB: l isRmax、LGmax、LBmax；
C. According to said LRmax、LGmax、LBmaxAnd white balance luminance ratio α: beta: gamma calculating the expected brightness value of the LED light source corresponding to the three primary colors RGB: l isR、LG、LB；
D. Acquiring a desired color of the LED light source and color coordinates (a, b, c) corresponding to the desired color;
E. calculating the duty ratio D of the corresponding three primary colors RGB according to the color coordinates (a, b, c)R、DG、DB；
F. Respectively calculate LRout＝LR*DR、LGout＝LG*DG、LBout＝LB*DBTo obtain the output brightness L of the LED light source corresponding to the RGB three primary colorsRout、LGout、LBout。
2. The light mixing method of claim 1,
in step a, the white balance luminance ratio α: beta: γ is obtained by referring to the color temperature-to-white balance luminance ratio correspondence table or by the RGB white balance luminance ratio formula.
3. The light mixing method of claim 1,
in step C, the desired luminance value: l isR、LG、LBThe ratio of (A) to (B): l isR：LG：LB＝α：β：γ。
4. The light mixing method according to claim 3,
in step C, the L is allowed to reactR＝LRmaxThen the desired luminance value is calculated: l isR、LG、LB。
5. The light mixing method of claim 4,
when the L isG＞LGmaxAnd/or LB＞LBmaxWhen the L is not in the rangeG＝LRmaxThen the desired luminance value is calculated: l isR、LG、LB。
6. The light mixing method of claim 5,
when the L isB＞LBmaxWhen the L is not in the rangeB＝LBmaxThen the desired luminance value is calculated: l isR、LG、LB。
7. The light mixing method of claim 1,
in step E, according to DR＝a/255、DG＝b/255、DBCalculating said D as c/255R、DG、DB。
8. The light mixing method of claim 1,
the desired color temperature of the LED light source is 6000K.
9. The light mixing method of claim 1,
between the step C and the step D, the method also comprises the following steps:
according to the maximum current ImaxMaximum brightness value: l isRmax、LGmax、LBmaxAnd desired luminance value: l isR、LG、LBCalculating the full load current I of the LED light source corresponding to the RGBR、IG、IB。
10. A linear lighting fixture comprising a control unit, characterized in that,
the control unit adjusts the output brightness of the LED light sources in the linear lighting fixture according to the light mixing method of any of claims 1-9.
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