CN114375082B - LED light source dimming method and dimming system - Google Patents

LED light source dimming method and dimming system Download PDF

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CN114375082B
CN114375082B CN202210277204.4A CN202210277204A CN114375082B CN 114375082 B CN114375082 B CN 114375082B CN 202210277204 A CN202210277204 A CN 202210277204A CN 114375082 B CN114375082 B CN 114375082B
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color temperature
light source
led light
temperature led
current
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CN114375082A (en
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高权
李虎
杨枢要
陈国平
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Guangzhou Guanglian Electronic Technology Co ltd
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Guangzhou Guanglian Electronic Technology Co ltd
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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]
    • H05B45/20—Controlling the colour of the light

Abstract

The invention relates to a method and a system for dimming an LED light source, comprising the following steps: establishing a dimming relational expression according to the first relational expression, the second relational expression and the fitting relational expression; the dimming relation comprises a fitted color temperature T3Fitted luminous flux Pm3Respectively connected with the current A of the first color temperature LED light source under the condition that the first color temperature LED light source and the second color temperature LED light source are both electrified31Current A of the second color temperature LED light source32The relational expression of (1); adjusting the current A of the first color temperature LED light source according to the dimming relation31And current A of a second color temperature LED light source32To make the fitted color temperature T3Satisfying the set color temperature value, and adjusting the current A according to the light-adjusting relation and the required set luminous flux31And A32Adjusting the fitted luminous flux Pm3. The invention can continuously adjust the luminous flux of the LED light source within a certain range under the condition that the color temperature, the color rendering index Ra and the R9 of the LED light source are basically unchanged.

Description

LED light source dimming method and dimming system
Technical Field
The invention relates to the technical field of lighting sources, in particular to a dimming method and a dimming system for an LED light source.
Background
The LED has the characteristics of energy conservation, environmental protection, long service life and the like, and is widely applied to the fields of illumination, backlight display and the like. However, as the quality of life of people is improved, the requirements on the illumination light source are higher and higher, and the requirements on the color rendering indexes of different brightness in the illumination process are higher. At present, functions of LED products are more and more diversified and intelligentized, but the requirement is difficult to meet by a single light source, and the integrated LED can meet the requirements of different color temperatures, different color rendering indexes and different brightness in the single light source. Different color temperatures, different color rendering indexes and different brightness requirements require corresponding dimming schemes to be configured.
Disclosure of Invention
The present invention is directed to overcoming at least one of the above-mentioned disadvantages of the prior art, and providing a method and a system for dimming an LED light source, which are used to solve the problem that it is difficult to adjust the color temperature and luminous flux of an LED white light source according to the requirements.
The technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a method for dimming an LED light source, where the LED light source includes a first color temperature LED light source and a second color temperature LED light source, and the color temperature ranges of the first color temperature LED light source and the second color temperature LED light source are different, the method including:
establishing a dimming relational expression according to the first relational expression, the second relational expression and the fitting relational expression;
the first relation comprises the color temperature T of the first color temperature LED light source under the condition that the first color temperature LED light source is electrified independently1And current A1Relational expression, under the condition that the second color temperature LED light source is independently electrified, the color temperature T of the second color temperature LED light source2And current A2A relational expression;
the second relation comprises luminous flux Pm of the first color temperature LED light source under the condition that the first color temperature LED light source is electrified independently1And current A1Relational expression, under the condition that the second color temperature LED light source is electrified independently, luminous flux Pm of the second color temperature LED light source2And current A2A relational expression;
the fitting relation comprises the color temperature T of the first color temperature LED light source1And luminous flux Pm1And the color temperature T of the second color temperature LED light source2And luminous flux Pm2A color temperature T fitted to the first color temperature LED light source and the second color temperature LED light source3The relational expression of (1);
the dimming relation comprises the fitted color temperature T3The current A of the first color temperature LED light source is equal to the current A of the first color temperature LED light source under the condition that the first color temperature LED light source and the second color temperature LED light source are electrified31Current A of the second color temperature LED light source32Further comprises the fitted luminous flux Pm3Under the condition of being electrified with both the first color temperature LED light source and the second color temperature LED light sourceThe current A of the first color temperature LED light source31Current A of the second color temperature LED light source32The relational expression of (a);
according to the dimming relation, adjusting the current A of the first color temperature LED light source31And current A of the second color temperature LED light source32To make the fitted color temperature T3Satisfying the set color temperature value, and adjusting the current A according to the light-adjusting relation and the required set luminous flux31And A32Adjusting the fitted luminous flux Pm3。
Optionally, the fitting relation is: t is1×Pm1+T2×Pm2=T3（Pm1 + Pm2）；
Wherein, T1The color temperature of the first color temperature LED light source under the condition of independently electrifying the first color temperature LED light source is obtained; pm1The luminous flux of the first color temperature LED light source under the condition of independently electrifying the first color temperature LED light source;
T2the color temperature of the second color temperature LED light source is the color temperature of the second color temperature LED light source under the condition that the second color temperature LED light source is independently electrified; pm2The luminous flux of the second color temperature LED light source under the condition of independently electrifying the second color temperature LED light source;
T3the color temperature is the color temperature which is fitted under the condition that the first color temperature LED light source and the second color temperature LED light source are both electrified.
Optionally, the first relational expression is obtained by fitting according to the color temperature values of the first color temperature LED light source at different current values, and is obtained by fitting according to the color temperature values of the second color temperature LED light source at different current values.
Optionally, the second relational expression is obtained by fitting according to the luminous flux values of the first color temperature LED light source at different current values, and is obtained by fitting according to the luminous flux values of the second color temperature LED light source at different current values.
Optionally, the first relation is a first order function with the current as a variable and the color temperature as a function value, and/or the second relation is a second order function with the current as a variable and the luminous flux as a function value.
Optionally, the dimming relationship comprises: pm3=Pm31+Pm32Pm is said31、Pm32Respectively electrifying the first color temperature LED light source with the current of A31The luminous flux and the current of the second color temperature LED light source under the condition are A32Luminous flux under the conditions.
Optionally, the current A of the first color temperature LED light source is adjusted according to the dimming relation31And current A of the second color temperature LED light source32So that the fitted color temperature T3Satisfying the set color temperature value and adjusting the current A according to the light-adjusting relation and the required set luminous flux31And A32Adjusting the fitted luminous flux Pm3The method comprises the following steps:
setting the current of the first color temperature LED light source and the second color temperature LED light source in a full-power state to be A0Calculating the color temperature T according to the first relation and the second relation10、T20、Pm10、Pm20And then calculating the first color temperature LED light source and the second color temperature LED to be both A according to the fitting relational expression0Setting the color temperature value under the electrified condition as a rated fitting color temperature value T30(ii) a Wherein, T10、T20Respectively independently applying current A to the first color temperature LED light source and the second color temperature LED light source0The color temperature, Pm of the first and second LED light sources when the LED is powered on10、Pm20The current A is respectively used for the first color temperature LED light source and the second color temperature LED light source0Luminous flux of the first color temperature LED light source and the second LED light source when the LED light source is electrified;
color temperature T fitting in fitting relation3= T30According to Pm3= Pm31+Pm32Obtaining fitted luminous flux Pm3Current A of the first color temperature LED light source31And current A of the second color temperature LED light source32According to the relation of Pm3And A31And A32And the required set luminous flux adjusts the current A of the first color temperature LED light source31And current A of the second color temperature LED light source32The fitted luminous flux Pm can be adjusted3。
Optionally, the color temperature range of the first color temperature LED light source is 7000-9000K, and the color temperature range of the second color temperature LED light source is 4500-6500K.
Optionally, the first relation is:
T1=273.47A1+6170.5；
T2=140.2A2+4748.3。
optionally, the second relation is:
Pm1=-393.26A1 2+4744.1A1+399.11；
Pm2=-321.28A2 2+3916.9A2+260.72。
optionally, the fitted luminous flux
Pm3= Pm31+Pm32=-393.26A31 2-321.28A32 2+4744.1A31+3916.9A32+659.83, and A31、A32The following relation is satisfied:
T3=（d3A31 3+k3A32 3+d4A31 2+k4A32 2+d5A31+k5A32+n）/（d1A31 2+k1A32 2+d2A31+k2A32+m）
T3=（T10×Pm10+T20×Pm20）/（Pm10+ Pm20）
wherein d is1、d2、d3、d4、d5、k1、k2、k3、k4、k5M and n are constants.
In a second aspect, the present invention provides a dimming system for an LED light source, where the LED light source includes a first color temperature LED light source and a second color temperature LED light source, and the color temperature ranges of the first color temperature LED light source and the second color temperature LED light source are different, the dimming system includes a relationship establishing module and a current adjusting module:
the relation establishing module is used for establishing a dimming relation according to the first relation, the second relation and the fitting relation;
the first relation comprises the color temperature T of the first color temperature LED light source under the condition that the first color temperature LED light source is electrified independently1And current A1Relational expression, under the condition that the second color temperature LED light source is independently electrified, the color temperature T of the second color temperature LED light source2And current A2A relational expression;
the second relation comprises luminous flux Pm of the first color temperature LED light source under the condition that the first color temperature LED light source is electrified independently1And current A1Relational expression, under the condition that the second color temperature LED light source is electrified independently, luminous flux Pm of the second color temperature LED light source2And current A2A relational expression;
the fitting relation comprises the color temperature T of the first color temperature LED light source1And luminous flux Pm1And the color temperature T of the second color temperature LED light source2And luminous flux Pm2A color temperature T fitted to the first color temperature LED light source and the second color temperature LED light source3The relational expression of (1);
the dimming relation comprises the fitted color temperature T3The current A of the first color temperature LED light source is equal to the current A of the first color temperature LED light source under the condition that the first color temperature LED light source and the second color temperature LED light source are electrified31Current A of the second color temperature LED light source32Further comprises the fitted luminous flux Pm3Current A of the first color temperature LED light source31Current A of the second color temperature LED light source32The relational expression of (1);
the current adjusting module is used for adjusting the current A of the first color temperature LED light source according to the dimming relational expression31And current A of the second color temperature LED light source32To make the fitted color temperature T3Satisfy the set color temperature value and pass through the required set luminous flux according to the light-adjusting relational expressionRegulating the current A31And A32Adjusting the fitted luminous flux Pm3。
Optionally, the first color temperature LED light source and the second color temperature LED light source adopt the same LED chip and phosphor formula, and the thicknesses of the phosphor layers of the first color temperature LED light source and the second color temperature LED light source are different.
Optionally, the LED chip is a blue chip with a peak wavelength of 450nm to 460nm, the phosphor is a mixed phosphor of green phosphor and red phosphor, the phosphor layer thickness of the first color temperature LED light source is 163 μm, and the phosphor thickness of the second color temperature LED light source is 168 177 μm.
Optionally, the first color temperature LED light sources and the second color temperature LED light sources are respectively multiple, and the first color temperature LED light sources and the second color temperature LED light sources are substantially arranged at intervals.
The LED light source dimming method and the LED light source dimming system are suitable for the stage lamp optical system.
Compared with the prior art, the invention has the beneficial effects that: under the condition that the color temperature, the color rendering index Ra and the R9 of the LED light source are basically unchanged, the luminous flux of the LED light source can be continuously adjusted within a certain range, and the color coordinate is controlled within a 3-step MacAdam ellipse.
Drawings
Fig. 1 is a flowchart of an LED light source dimming method according to embodiment 1 of the present invention.
Fig. 2 is a graph showing a relationship between a current and a color temperature of the first color temperature LED light source and the second color temperature LED light source in embodiment 1 of the present invention.
Fig. 3 is a graph showing the relationship between the current and the luminous flux of the first color temperature LED light source and the second color temperature LED light source in embodiment 1 of the present invention.
Fig. 4 is a light source integrating sphere spectrum fitted to a first color temperature LED light source and a second color temperature LED light source in the verification test of embodiment 1 of the present invention.
Fig. 5 is a light source integrating sphere color coordinate diagram fitted by the first color temperature LED light source and the second color temperature LED light source in the verification test of embodiment 1 of the present invention.
Fig. 5a is an enlarged view of circled area a of fig. 5.
Fig. 6 is a composition diagram of a dimming system of an LED light source according to embodiment 2 of the present invention.
Detailed Description
The drawings are only for purposes of illustration and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
The embodiment provides an LED light source dimming method for dimming an LED light source, where the LED light source includes a first color temperature LED light source and a second color temperature LED light source, and the color temperature ranges of the first color temperature LED light source and the second color temperature LED light source are different. The first color temperature LED light source and the second color temperature LED light source can respectively adopt LED chips with different wavelengths and/or LED chips with different primary colors and/or different fluorescent powder formulas and/or different thicknesses of fluorescent powder layers and the like, so that the difference of color temperature ranges of the first color temperature LED light source and the second color temperature LED light source is realized.
The dimming target of the present embodiment is the luminous flux Pm that fits the first color temperature LED light source and the second color temperature LED light source3Can be continuously adjusted within a certain range and satisfies the color temperature T of fitting3Is substantially unchanged.
Fig. 1 is a flowchart of a method for dimming an LED light source according to the present embodiment, as shown in fig. 1, the method includes:
s1, establishing a dimming relational expression according to the first relational expression, the second relational expression and the fitting relational expression.
The first relation comprises the color temperature T of the first color temperature LED light source under the condition that the first color temperature LED light source is electrified independently1And current A1Relational expression, and under the condition of independently electrifying the second color temperature LED light source, the color temperature T of the second color temperature LED light source2And current A2And (4) a relational expression.
According to the first relation, the color temperature T of the first color temperature LED light source can be adjusted1Current A with first color temperature LED light source1Coming watchThe color temperature T of the second color temperature LED light source is shown2Current A with second color temperature LED light source2To indicate.
The second relation comprises luminous flux Pm of the first color temperature LED light source under the condition of independently electrifying the first color temperature LED light source1And current A1Relational expression, light flux Pm of second color temperature LED light source under the condition of independently electrifying the second color temperature LED light source2And current A2And (4) a relational expression.
According to the second relation, the luminous flux Pm of the first color temperature LED light source can be adjusted1Also using the current A of the first color temperature LED light source1To show the luminous flux Pm of the second color temperature LED light source2Also using the current A of the second color temperature LED light source2To indicate.
The fitting relation comprises the color temperature T of the first color temperature LED light source1And luminous flux Pm1And the color temperature T of the second color temperature LED light source2And luminous flux Pm2Color temperature T fitting to the first and second color temperature LED light sources3The relational expression (c) of (c).
Color temperature T for realizing fitting of first color temperature LED light source and second color temperature LED light source3The fitting relation determines the fitted color temperature T3The first relation, the second relation and the fitted color temperature T can be determined according to the parameter relation of the first color temperature LED light source and the second color temperature LED light source before fitting3Establishing a dimming relation.
At the color temperature T of the first color temperature LED light source1And luminous flux Pm1The current A of the LED light source with the first color temperature can be respectively used1To express the color temperature T of the second color temperature LED light source2And luminous flux Pm2The current A of the LED light source with the second color temperature can be respectively used2According to the fitting relation, the current A of the first color temperature LED light source can be used31Current A of the second color temperature LED light source32Respectively representing fitted color temperatures T3And fitted luminous flux Pm3And obtaining a dimming relation formula which can be used for dimming.
The dimming relation includes a fitted color temperature T3Current A of the first color temperature LED light source under the condition of being electrified with the first color temperature LED light source and the second color temperature LED light source31Current A of the second color temperature LED light source32Also includes the fitted luminous flux Pm3The current A of the first color temperature LED light source under the condition of being electrified with the first color temperature LED light source and the second color temperature LED light source31Current A of the second color temperature LED light source32The relational expression of (1);
s2, adjusting the current A of the first color temperature LED light source according to the dimming relation31And current A of a second color temperature LED light source32To make the fitted color temperature T3Satisfying the set color temperature value, and adjusting the current A according to the light-adjusting relation and the required set luminous flux31And A32Adjusting the fitted luminous flux Pm3。
According to the dimming relation, the fitted color temperature T can be ensured3Adjusting the current A of the first color temperature LED light source according to the required set luminous flux for setting the color temperature value31And current A of a second color temperature LED light source32So that the fitted luminous flux Pm3To set the luminous flux, the dimming goal can thus be achieved: luminous flux Pm fitted by first color temperature LED light source and second color temperature LED light source3Can be continuously adjusted within a certain range and satisfies the color temperature T of fitting3Is substantially unchanged.
The first relational expression and the second relational expression may be determined based on design data of the first color temperature LED light source and the second color temperature LED light source, or may be determined based on measured data. In view of the possible differences between the LED light source before design and after design and manufacture, the first and second relations are preferably determined based on measured data, which may be obtained by measuring the first color temperature LED light source and the second color temperature LED light source at different current values.
The first relational expression can be obtained by fitting according to the color temperature values of the first color temperature LED light source under different current values, and can be obtained by fitting according to the color temperature values of the second color temperature LED light source under different current values.
Similarly, the second relational expression can be obtained by fitting according to the luminous flux values of the first color temperature LED light source at different current values and fitting according to the luminous flux values of the second color temperature LED light source at different current values.
Specifically, the first color temperature LED light source and the second color temperature LED light source are subjected to energization tests at different current values: changing the Current A of the first color temperature LED light Source1Different currents A can be obtained1Color temperature T of lower first color temperature LED light source1And luminous flux Pm1(ii) a Changing the current A of the second color temperature LED light source2Different currents A can be obtained2T of lower first color temperature LED light source2And luminous flux Pm2. In a specific energization test, in addition to the two parameters of color temperature and luminous flux, other parameters such as voltage, color coordinates, color rendering index Ra, display index R9, and the like may be obtained.
As shown in table 1, table 1 shows measured data of a first color temperature LED light source and a second color temperature LED light source under separate power-on conditions, wherein the measured data includes current, voltage, color temperature, luminous flux, color coordinates x and y, color rendering index Ra, display index R9, and luminous flux percentage. More specifically, the color temperature range of the first color temperature LED light source in the power-on test is 7000-9000K, and the color temperature range of the second color temperature LED light source is 4500-6500K. More specifically, the LED chip is a blue chip with a peak wavelength of 450nm-460nm, the phosphor is a mixed phosphor of green phosphor and red phosphor, the phosphor layer thickness of the first color temperature LED light source is 163 μm, and the phosphor thickness of the second color temperature LED light source is 168 177 μm.
TABLE 1 actual measurement data of first color temperature LED light source and second color temperature LED light source under independent power-on condition
Figure 564170DEST_PATH_IMAGE001
From the current values and color temperature values of the first color temperature LED light source and the second color temperature LED light source in table 1, a graph of the relationship between current and color temperature as shown in fig. 2 can be drawn.
As can be seen from fig. 2, the relationship between the current and the color temperature of the first color temperature LED light source and the second color temperature LED light source changes substantially linearly, so that the first relationship can be expressed by a unitary linear function, where the first relationship is a unitary linear function with the current as a variable and the color temperature as a function. Constant parameters of a unary linear function formula can be determined according to measured data, and finally a first relation formula is obtained:
T1=273.47A1+6170.5；
T2=140.2A2+4748.3。
from the current values and the luminous fluxes of the first color temperature LED light source and the second color temperature LED light source in table 1, a graph of the relationship between the current and the luminous flux as shown in fig. 3 can be drawn.
As can be seen from fig. 3, the relationship curve between the current and the color temperature of the first color temperature LED light source and the second color temperature LED light source is substantially changed like a parabola, so that the first relationship can be expressed by a unitary quadratic function, in which the second relationship is a unitary quadratic function using the current as a variable and the color temperature as a function value. Constant parameters of the unary quadratic function formula can be determined according to the measured data, and finally a second relation formula is obtained:
Pm1=-393.26A1 2+4744.1A1+399.11；
Pm2=-321.28A2 2+3916.9A2+260.72。
for the fitting relation, the following formula may be employed: t is a unit of1×Pm1+T2×Pm2=T3（Pm1 + Pm2）；
Wherein, T1The color temperature of the first color temperature LED light source is the color temperature of the first color temperature LED light source under the condition that the first color temperature LED light source is independently electrified; pm1The luminous flux of the first color temperature LED light source under the condition of independently electrifying the first color temperature LED light source;
T2the color temperature of the second color temperature LED light source is achieved under the condition that the second color temperature LED light source is independently electrified; pm2The luminous flux of the second color temperature LED light source is under the condition of independently electrifying the second color temperature LED light source;
T3the color temperature is the color temperature fitted under the condition that the first color temperature LED light source and the second color temperature LED light source are both electrified.
The color temperature T of the first color temperature LED light source and the second color temperature LED light source can be fitted through the fitting relation3And the color temperature T of the front first color temperature LED light source is relatively accurately fitted in a correlated manner1And luminous flux Pm1Color temperature T of second color temperature LED light source2And luminous flux Pm2。
For the dimming relation, the following formula may be employed: pm3=Pm31+Pm32，Pm31、Pm32Respectively electrifying the first color temperature LED light source with the current of A31The luminous flux and the second color temperature LED light source current under the condition are A32Luminous flux under the conditions A31、A32The first color temperature LED light source and the second color temperature LED light source are respectively electrified currents under the condition of being electrified.
By the dimming relation, the luminous flux Pm of the first color temperature LED light source and the second color temperature LED light source can be fitted3More accurately using the first color temperature LED light source electrifying current A31Second color temperature LED light source energizing current A32To express.
In an alternative embodiment, in step S2, the current a of the first color temperature LED light source is adjusted31And current A of a second color temperature LED light source32To make the fitted color temperature T3Satisfying the set color temperature value and adjusting the current A according to the light-adjusting relation and the required set luminous flux31And A32Adjusting the fitted luminous flux Pm3The method comprises the following steps:
setting the current of the first color temperature LED light source and the second color temperature LED light source in a full-power state to be A0Calculating the color temperature T according to the first relation and the second relation10、T20、Pm10、Pm20And then calculating the first color temperature LED light source and the second color temperature LED to be both A according to the fitting relational expression0Setting the color temperature value under the electrified condition as a rated fitting color temperature value T30。
Wherein, T10、T20The current A is respectively used for the first color temperature LED light source and the second color temperature LED light source0The color temperature Pm of the first and second LED light sources when energized10、Pm20Respectively independently applying current A to the first color temperature LED light source and the second color temperature LED light source0Luminous flux of the first color temperature LED light source and the second LED light source when the LED light source is electrified;
color temperature T fitting in fitting relation3 = T30According to Pm3= Pm31+Pm32Obtaining fitted luminous flux Pm3Current A of the first color temperature LED light source31And current A of a second color temperature LED light source32According to the relation of Pm3And A31And A32And the required set luminous flux adjusts the current A of the first color temperature LED light source31And current A of a second color temperature LED light source32The fitted luminous flux Pm can be adjusted3。
According to the current A of the first color temperature LED light source31And current A of a second color temperature LED light source32The specific adjustment method of (3) is to make the first relational expression and the second relational expression:
T1=273.47A1+6170.5；
T2=140.2A2+4748.3；
Pm1=-393.26A1 2+4744.1A1+399.11；
Pm2=-321.28A2 2+3916.9A2+260.72；
substituting into the dimming relational expression Pm3= Pm31+Pm32The fitted luminous flux can be obtained:
Pm3= Pm31+Pm32=-393.26A31 2-321.28A32 2+4744.1A31+3916.9A32+659.83；
and A is31、A32The following relationships are satisfied:
T3=（d3A31 3+k3A32 3+d4A31 2+k4A32 2+d5A31+k5A32+n）/（d1A31 2+k1A32 2+d2A31+k2A32+m）
T3=（T10×Pm10+T20×Pm20）/（Pm10+ Pm20）
wherein d is1、d2、d3、d4、d5、k1、k2、k3、k4、k5M, n are constants which can be calculated according to the following formula:
T3=（T1×Pm1+T2×Pm2）/（Pm1+ Pm2）
that is, it can be calculated according to the following formula:
T3=（（-393.26A1 2+4744.1A1+399.11）×（273.47A1+6170.5）+（-321.28A2 2+3916.9A2+260.72）×（140.2A2+4748.3））/（-393.26A1 2-321.28A2 2+4744.1A1+3916.9A2+659.83）
exemplarily, assume that the first color temperature LED light source and the second color temperature LED light source have a current at full power state as a0The current A of the first color temperature LED light source31And current A of a second color temperature LED light source32The specific adjusting steps are as follows:
a is to be0Substituting the first relational expression and the second relational expression to calculate the color temperature T10、T20、Pm10、Pm20；
Will T10、T20、Pm10、Pm20Substitution into T3=（T10×Pm10+T20×Pm20）/（Pm10+ Pm20) Calculating the first color temperature LED light source and the second color temperature LED to be both A0Electrifying stripThe color temperature value under the part is taken as a rated fitting color temperature value T30；
Color temperature T to be fitted3= T30Substituting the fitting relational expression and combining the first relational expression and the second relational expression to obtain the fitted color temperature T30Current A of the first color temperature LED light source31And current A of a second color temperature LED light source32The relation of (1):
T30=（d3A31 3+k3A32 3+d4A31 2+k4A32 2+d5A31+k5A32+n）/（d1A31 2+k1A32 2+d2A31+k2A32+m）
according to Pm3= Pm31+Pm32Obtaining fitted luminous flux Pm3Current A of the first color temperature LED light source31And current A of a second color temperature LED light source32The relation of (1):
Pm3=Pm1+Pm2=-393.26A31 2-321.28A32 2+4744.1A31+3916.9A32+659.83
color temperature T combined with fitting30Current A of the first color temperature LED light source31And current A of a second color temperature LED light source32With a fitted luminous flux Pm3Current A of the first color temperature LED light source31And current A of a second color temperature LED light source32Can be adjusted by adjusting the current A according to the desired set luminous flux31And current A32Adjusting the fitted luminous flux Pm3Let the fitted luminous flux Pm3To set the luminous flux.
In order to verify the accuracy of the LED light source dimming method provided in this embodiment, a verification test is performed. A single 455-457nm wavelength chip and the same fluorescent powder formula are adopted, a first color temperature LED light source is manufactured by a single path, and a second color temperature LED light source is manufactured by a double path. Then, the first color temperature LED light source and the second color temperature LED light source are simultaneously turned on, and the measured data under different current conditions are obtained as shown in table 2.
TABLE 2 actual measurement data of the first color temperature LED light source and the second color temperature LED light source in the verification test
Figure 812749DEST_PATH_IMAGE002
In order to verify the accuracy of the dimming method, the method selects several data to verify:
（1）A31=3 and A32If =3, the measurement result T3’=6302，
When A is1=3，A2If =3, then T is determined according to the first relation1=6990.91，T2=5168.9, according to the second relation then Pm1=11092.07，Pm2=9119.9, then T after fitting3According to
T3=（T1×Pm1+T2×Pm2）/（Pm1+ Pm2）
Calculating to obtain T3=6169。
And the actual measurement result T3' =6302, it can be seen that the error between the theoretical value and the measured value is small (error = (6302 and 6169)/6302 = 2.1%), which indicates that the relation T is fit under the condition1×Pm1+T2×Pm2=T3（Pm1 + Pm2) This is completely true.
Further, according to a second relational expression Pm1=11092.07，Pm2=9119.9, then Pm after fitting3According to
Pm3= Pm31+Pm32
Pm is obtained through calculation3=20212。
And the actual measurement result Pm3' =20279, it can be seen that the error between the theoretical value and the measured value is small (error = (20279 and 20212)/20279 = 0.33%).
Therefore, the dimming relation of the present invention for A31=3、A32When =3The method is applicable.
（2）A31=2.86 and A32If =2.162, the measurement result T3’=6318，
When A is1=2.86，A2If =2.162, then T is determined according to the first relation1=6952.62 ，T2=5051.41, according to the second relation then Pm1=10750.53，Pm2=7227.32, then T after fitting3According to
T3=（T1×Pm1+T2×Pm2）/（Pm1+ Pm2）
Calculating to obtain T3=6188。
And the actual measurement result T3' =6318, it can be seen that the theoretical value and the measured value have small errors (error = (6318 and 6188)/6318 = 2.1%), which indicates that the relation T is fit under the condition1×Pm1+T2×Pm2=T3（Pm1 + Pm2) This is completely true.
Further, according to a second relational expression Pm1=10750.53，Pm2=7227.32, then Pm after fitting3According to
Pm3= Pm31+Pm32
Pm is obtained by calculation3=17978。
And the actual measurement result Pm3' =18154, it can be seen that the theoretical value and the measured value have small error (error = (18154 and 17978)/18154 = 0.97%).
Therefore, the dimming relation of the invention to A31=2.86、A32The case is true when = 2.162.
（3）A31=2.54 and A32If =1.712, the measurement result T3’=6290，
When A is1=2.54，A2If =1.712, T is determined according to the first relation1=6865.11 ，T2=4988.32, Pm according to second relation1=9911.97，Pm2=6024.8, then T after fitting3According to
T3=（T1×Pm1+T2×Pm2）/（Pm1+ Pm2）
Calculating to obtain T3=6156。
And the actual measurement result T3' =6290, it can be seen that the error between the theoretical value and the measured value is small (error = (6290 and 6156)/6290 = 2.1%), which indicates that the relation T is fit under the condition1×Pm1+T2×Pm2=T3（Pm1 + Pm2) This is completely true.
Further, according to a second relational expression Pm1=9911.97，Pm2=6024.8, then Pm after fitting3According to
Pm3= Pm31+Pm32
Pm is obtained through calculation3=15937。
And the actual measurement result Pm3' =16173, it can be seen that the theoretical value and the measured value have small errors (error = (16173 and 15937)/16173 = 1.46%).
Therefore, the dimming relation of the present invention for A31=2.54、A32The case is applicable when = 1.712.
（4）A31=2.29 and A32If =1.262, the measurement result T3’=6311，
When A is1=2.29，A2If =1.262, according to the first relational expression, T1=6796.75 ，T2=4925.23, according to the second relation then Pm1=9200.8，Pm2=4692.16, then T after fitting3According to
T3=（T1×Pm1+T2×Pm2）/（Pm1+ Pm2）
Calculating to obtain T3=6165。
And the actual measurement result T3' =6311, it can be seen that the error between the theoretical value and the measured value is small (error = (6311 and 6165)/6311 = 2.3%), which indicates that the relation T is fit under the condition1×Pm1+T2×Pm2=T3（Pm1 + Pm2) This is completely true.
Further, according to the second relationSystem type Pm1=9200.8，Pm2=4692.16, then Pm after fitting3According to
Pm3= Pm31+Pm32
Pm is obtained by calculation3=13893。
And the measured result Pm3' =14175, it can be seen that the theoretical value and the measured value have small errors (error = (14175 + 13893)/14175 = 1.99%).
Therefore, the dimming relation of the present invention for A31=2.29、A32The case is applicable when = 1.262.
（5）A31=1.93 and A32If =1, the measurement result T3’=6268，
When A is1=1.93，A2If =1, then T is determined according to the first relation1=6698.3 ，T2=4888.5, according to the second relation then Pm1=8090.37，Pm2=3856.34, then T after fitting3According to
T3=（T1×Pm1+T2×Pm2）/（Pm1+ Pm2）
Calculating to obtain T3=6114。
And the actual measurement result T3' =6268, it can be seen that the error between the theoretical value and the measured value is small (error = (6268 and 6114)/6268 = 2.5%), which indicates that the relation T is fit under the condition1×Pm1+T2×Pm2=T3（Pm1 + Pm2) This is completely true.
According to a second relational expression Pm1=8090.37，Pm2=3856.34, then Pm after fitting3According to
Pm3= Pm31+Pm32
Pm is obtained through calculation3=11947。
And the actual measurement result Pm3' =12250, it can be seen that the theoretical value has a small error from the measured value (error = (12250 and 11947)/12250 = 2.48%).
Therefore, the dimming relation formula A of the invention31=1.93、A32=1It is applicable to the treatment of chronic hepatitis B.
As can be seen from the above, the dimming relational expression according to the present invention can be established.
It is worth noting that: the invention adopts the measured data to carry out verification, and is based on the measured data A31、A32The color temperature and luminous flux were verified, which was done to facilitate manual calculation. Theoretically speaking, the verification test should calculate A first based on the dimming method of the invention31、A32And then based on the calculated A31、A32Comparing with measured data, e.g. when Pm needs to be adjusted3=90%×Pm30When it is, then A31、A32Should be calculated based on the following formula:
Pm3= Pm31+Pm32=-393.26A31 2-321.28A32 2+4744.1A31+3916.9A32+659.83=90%×Pm30
Pm3=（（Pm31×Tm31）+（Pm31×Tm32））/T3=（（Pm31×Tm32）+（Pm31×Tm32））/T30=（（-393.26A31 2+4744.1A31+399.11）×（273.47A31+6170.5）+（-321.28A32 2+3916.9A32+260.72）×（140.2A32+4748.3））/T30
theoretically, two variables A31、A32Can be fully calculated from the two equations. However, the calculation is inconvenient for manual calculation, and the calculation amount is large, so the invention does not adopt the verification mode, but adopts the actually measured data A31、A32The error of the color temperature and the light flux of the measured data and the error of the color temperature and the light flux of the theoretical data are compared by substituting the formula of the dimming method, and the correctness of the dimming method can be proved as long as the errors of the measured data and the theoretical data are smaller.
Furthermore, as can be seen from table 2, the color temperatures fitted to the first color temperature LED light source and the second color temperature LED light source remained substantially unchanged at different fitted luminous fluxes in the validation test. The actual measurement result shows that the dimming relation can be completely established, and the actual measurement result can represent a theoretical result, so that the LED light source dimming method enables the light source to be continuously adjustable within the range of 35% -100% of luminous flux, and simultaneously meets the requirements that the color temperature is basically unchanged, the color temperature and the color rendering index Ra are basically unchanged, the Ra is controlled to be more than 95, and the color coordinate is controlled to be within a 3-order MacAdam ellipse. In particular, the color rendering index Ra > 95.5, R9 > 95 when the luminous flux is 60% to 100%.
The light source integrating sphere spectral diagram and the light source integrating sphere color coordinate diagram fitted to the first color temperature LED light source and the second color temperature LED light source are respectively shown in fig. 4 (the luminous flux percentage is rounded to an integer) and fig. 5 and 5 a.
As can be known from table 2, fig. 4, fig. 5, and fig. 5a, by using the LED light source dimming method provided in this embodiment, the LED light source can be continuously adjusted within a range of 35% to 100% of brightness, and simultaneously, the color temperature is substantially unchanged, the color rendering index Ra and R9 are substantially unchanged, the R9 is controlled to be more than 90, the color coordinate is substantially not shifted, and the color coordinate is controlled to be within a 3-step macadam ellipse.
Example 2
The embodiment provides a dimming system for an LED light source, wherein the LED light source comprises a first color temperature LED light source and a second color temperature LED light source, and the color temperature ranges of the first color temperature LED light source and the second color temperature LED light source are different.
Fig. 6 is a composition diagram of the LED light source dimming system provided in this embodiment, as shown in fig. 6, which includes a relationship establishing module 21 and a current adjusting module 22:
the relation establishing module 21 is configured to establish a dimming relation according to the first relation, the second relation and the fitting relation;
the first relation comprises the color temperature T of the first color temperature LED light source under the condition of independently electrifying the first color temperature LED light source1And current A1Relational expression, and under the condition of independently electrifying the second color temperature LED light source, the color temperature T of the second color temperature LED light source2And current A2A relational expression;
the second relation comprises a single pair of the first color temperature LED light sourcesLuminous flux Pm of first color temperature LED light source under electrifying condition1And current A1Relational expression, light flux Pm of second color temperature LED light source under the condition of independently electrifying the second color temperature LED light source2And current A2A relational expression;
the fitting relation comprises the color temperature T of the first color temperature LED light source1And luminous flux Pm1And the color temperature T of the second color temperature LED light source2And luminous flux Pm2Color temperature T fitting to first and second color temperature LED light sources3The relational expression of (1);
the dimming relation comprises a fitted color temperature T3Current A of the first color temperature LED light source under the condition of being electrified with the first color temperature LED light source and the second color temperature LED light source31Current A of the second color temperature LED light source32Also includes the fitted luminous flux Pm3Current A of the first color temperature LED light source31Current A of the second color temperature LED light source32The relational expression of (1);
a current adjusting module 22 for adjusting the current A of the first color temperature LED light source according to the dimming relation31And current A of a second color temperature LED light source32To make the fitted color temperature T3Satisfies the set color temperature value and adjusts the current A according to the light-adjusting relational expression31And A32Adjusting the fitted luminous flux Pm3。
In order to make the color temperature ranges of the first color temperature LED light source and the second color temperature LED light source different, the same LED chip and phosphor formula can be used for the first color temperature LED light source and the second color temperature LED light source, but the phosphor layer thicknesses of the first color temperature LED light source and the second color temperature LED light source are different.
In order to make the dimming of the LED light source dimming system of this embodiment more accurate, in an optional implementation manner, the LED chip may specifically be a blue chip with a peak wavelength of 450nm to 460nm, the phosphor may specifically be a mixed phosphor of green phosphor and red phosphor, the phosphor layer thickness of the first color temperature LED light source is 163 μm, and the phosphor thickness of the second color temperature LED light source is 168 177 μm. More specifically, the color temperature of the first LED light source is 7000-9000K, and the color temperature range of the second LED light source is 4500-6500K.
In an alternative embodiment, the first color temperature LED light sources and the second color temperature LED light sources are respectively multiple, and the first color temperature LED light sources and the second color temperature LED light sources are arranged at intervals. Specifically, the first color temperature LED light sources may be arranged in a column or row, the second color temperature LED light sources may be arranged in a column or row, and the first color temperature LED light sources and the second color temperature LED light sources are arranged at intervals in a row or column.
In the specific implementation process, the first color temperature LED light sources of all paths and the second color temperature LED light sources of all paths of the LED light sources can be independently electrified and lightened, the first color temperature LED light sources are manufactured in the odd paths, and the second color temperature LED light sources are manufactured in the even paths.
Parts of this embodiment that are the same as those in embodiment 1 are not described again, please refer to corresponding parts in embodiment 1.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the claims of the present invention should be included in the protection scope of the claims of the present invention.

Claims (11)

1. An LED light source dimming method, wherein the LED light source comprises a first color temperature LED light source and a second color temperature LED light source, and the color temperature ranges of the first color temperature LED light source and the second color temperature LED light source are different, the dimming method comprising:
establishing a dimming relational expression according to the first relational expression, the second relational expression and the fitting relational expression;
the first relation comprises the color temperature T of the first color temperature LED light source under the condition that the first color temperature LED light source is electrified independently1And current A1Relational expression, under the condition that the second color temperature LED light source is independently electrified, the color temperature T of the second color temperature LED light source2And current A2A relational expression;
the second relation comprises the first color temperature LED light source under the condition that the first color temperature LED light source is electrified separatelyLuminous flux Pm1And current A1Relational expression, under the condition that the second color temperature LED light source is electrified independently, luminous flux Pm of the second color temperature LED light source2And current A2A relational expression;
the second relational expression is obtained by fitting according to the luminous flux values of the first color temperature LED light source under different current values, and is obtained by fitting according to the luminous flux values of the second color temperature LED light source under different current values;
the second relational expression is a unitary quadratic function expression which takes current as a variable and takes luminous flux as a function value;
the fitting relation comprises the color temperature T of the first color temperature LED light source1And luminous flux Pm1And the color temperature T of the second color temperature LED light source2And luminous flux Pm2A color temperature T fitted to the first color temperature LED light source and the second color temperature LED light source3The relational expression of (1);
the dimming relation comprises the fitted color temperature T3The current A of the first color temperature LED light source is equal to the current A of the first color temperature LED light source under the condition that the first color temperature LED light source and the second color temperature LED light source are electrified31Current A of the second color temperature LED light source32Also includes the fitted luminous flux Pm3The current A of the first color temperature LED light source is equal to the current A of the first color temperature LED light source under the condition that the first color temperature LED light source and the second color temperature LED light source are electrified31Current A of the second color temperature LED light source32The relational expression of (1);
the dimming relation comprises: pm3=Pm31+Pm32Pm is said31、Pm32Respectively electrifying the first color temperature LED light source with the current of A31The luminous flux and the current of the second color temperature LED light source under the condition are A32Luminous flux under the condition;
setting the current of the first color temperature LED light source and the second color temperature LED light source in a full-power state to be A0Calculating the color temperature T according to the first relation and the second relation10、T20、Pm10、Pm20And then calculating the first color temperature LED light source and the second color temperature LED to be both A according to the fitting relational expression0Electrifying stripSetting the color temperature value under the condition as a rated fitting color temperature value T30(ii) a Wherein, T10、T20The current A is respectively used for the first color temperature LED light source and the second color temperature LED light source0The color temperature, Pm of the first and second LED light sources when the LED is powered on10、Pm20The current A is respectively used for the first color temperature LED light source and the second color temperature LED light source0Luminous flux of the first color temperature LED light source and the second LED light source when the LED light source is electrified;
color temperature T fitting in fitting relation3= T30According to Pm3= Pm31+Pm32Obtaining fitted luminous flux Pm3Current A of the first color temperature LED light source31And current A of the second color temperature LED light source32According to the relation of Pm3And A31And A32And the required set luminous flux adjusts the current A of the first color temperature LED light source31And current A of the second color temperature LED light source32The fitted luminous flux Pm can be adjusted3；
The color temperature range of the first color temperature LED light source is 7000-9000K, and the color temperature range of the second color temperature LED light source is 4500-6500K.
2. The method of claim 1, wherein the fitting relation is: t is1×Pm1+T2×Pm2=T3（Pm1 + Pm2）；
Wherein, T1The color temperature of the first color temperature LED light source is the color temperature of the first color temperature LED light source under the condition that the first color temperature LED light source is independently electrified; pm1The luminous flux of the first color temperature LED light source under the condition of independently electrifying the first color temperature LED light source;
T2the color temperature of the second color temperature LED light source is the color temperature of the second color temperature LED light source under the condition that the second color temperature LED light source is independently electrified; pm2The luminous flux of the second color temperature LED light source under the condition of independently electrifying the second color temperature LED light source;
T3simulating the condition that the first color temperature LED light source and the second color temperature LED light source are both electrifiedThe combined color temperature.
3. The method according to claim 1, wherein the first relation is obtained by fitting according to color temperature values of the first color temperature LED light source at different current values, and is obtained by fitting according to color temperature values of the second color temperature LED light source at different current values.
4. The method of any one of claims 1 to 3, wherein the first relation is a first order function with a current as a variable and a color temperature as a function.
5. The method of claim 1, wherein the first relation is:
T1=273.47A1+6170.5；
T2=140.2A2+4748.3。
6. the method of claim 5, wherein the second relation is:
Pm1=-393.26A1 2+4744.1A1+399.11；
Pm2=-321.28A2 2+3916.9A2+260.72。
7. the method according to claim 6, wherein the fitted luminous flux Pm3= Pm31+Pm32=-393.26A31 2-321.28A32 2+4744.1A31+3916.9A32+659.83, and A31、A32The following relation is satisfied:
T3=（d3A31 3+k3A32 3+d4A31 2+k4A32 2+d5A31+k5A32+n）/（d1A31 2+k1A32 2+d2A31+k2A32+m）
T3=（T10×Pm10+T20×Pm20）/（Pm10+ Pm20）
wherein d is1、d2、d3、d4、d5、k1、k2、k3、k4、k5M and n are constants.
8. The utility model provides a LED light source dimming system, the LED light source includes first colour temperature LED light source and second colour temperature LED light source, the colour temperature range of first colour temperature LED light source with second colour temperature LED light source is different, its characterized in that, dimming system includes relation establishment module and current regulation module:
the relation establishing module is used for establishing a dimming relation according to the first relation, the second relation and the fitting relation;
the first relation comprises the color temperature T of the first color temperature LED light source under the condition that the first color temperature LED light source is electrified independently1And current A1Relational expression, under the condition that the second color temperature LED light source is independently electrified, the color temperature T of the second color temperature LED light source2And current A2A relational expression;
the second relation comprises luminous flux Pm of the first color temperature LED light source under the condition that the first color temperature LED light source is electrified independently1And current A1Relational expression, under the condition that the second color temperature LED light source is electrified independently, luminous flux Pm of the second color temperature LED light source2And current A2A relational expression;
the second relational expression is obtained by fitting according to the luminous flux values of the first color temperature LED light source under different current values, and is obtained by fitting according to the luminous flux values of the second color temperature LED light source under different current values;
the second relational expression is a unitary quadratic function expression which takes current as a variable and takes luminous flux as a function value;
the fitting relation comprises the color temperature T of the first color temperature LED light source1And luminous flux Pm1And the color temperature T of the second color temperature LED light source2And luminous flux Pm2A color temperature T fitted to the first color temperature LED light source and the second color temperature LED light source3The relational expression of (1);
the dimming relation comprises the fitted color temperature T3The current A of the first color temperature LED light source is equal to the current A of the first color temperature LED light source under the condition that the first color temperature LED light source and the second color temperature LED light source are electrified31Current A of the second color temperature LED light source32Also includes the fitted luminous flux Pm3Current A of the first color temperature LED light source31Current A of the second color temperature LED light source32The relational expression of (1);
the dimming relation comprises: pm3=Pm31+Pm32Pm is said31、Pm32Respectively electrifying the first color temperature LED light source with the current of A31The luminous flux and the current of the second color temperature LED light source under the condition are A32Luminous flux under the condition;
the current adjusting module is used for setting the current of the first color temperature LED light source and the second color temperature LED light source in a full-power state to be A0Calculating the color temperature T according to the first relation and the second relation10、T20、Pm10、Pm20And then calculating the first color temperature LED light source and the second color temperature LED to be both A according to the fitting relational expression0Setting the color temperature value as a rated fitting color temperature value T under the condition of electrifying30(ii) a Wherein, T10、T20Respectively independently applying current A to the first color temperature LED light source and the second color temperature LED light source0The color temperature Pm of the first and second LED light sources when energized10、Pm20Respectively independently applying current A to the first color temperature LED light source and the second color temperature LED light source0Luminous flux of the first color temperature LED light source and the second LED light source when the LED light source is electrified;
color temperature T fitting in fitting relation3= T30According to Pm3= Pm31+Pm32Obtaining fitted luminous flux Pm3Current A of the first color temperature LED light source31And current A of the second color temperature LED light source32According to the relation of Pm3And A31And A32And the required set luminous flux adjusts the current A of the first color temperature LED light source31And current A of the second color temperature LED light source32The fitted luminous flux Pm can be adjusted3；
The color temperature range of the first color temperature LED light source is 7000-9000K, and the color temperature range of the second color temperature LED light source is 4500-6500K.
9. The LED light source dimming system of claim 8, wherein the first color temperature LED light source and the second color temperature LED light source use the same LED chip and phosphor formulation, and the phosphor layer thickness of the first color temperature LED light source and the second color temperature LED light source are different.
10. The LED light source dimming system of claim 9, wherein the LED chip is a blue light chip with a peak wavelength of 450nm-460nm, the phosphor is a mixed phosphor of green phosphor and red phosphor, the thickness of the phosphor layer of the first color temperature LED light source is 163 μm in 148-177 μm, and the thickness of the phosphor layer of the second color temperature LED light source is 177 μm in 168-177 μm.
11. The LED light source dimming system of any one of claims 8 to 10, wherein the first color temperature LED light source and the second color temperature LED light source are respectively plural, and the first color temperature LED light source and the second color temperature LED light source are substantially arranged at intervals.
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