CN119364582A - Control method for enabling color temperatures of two-color COB to be consistent during color mixing - Google Patents
Control method for enabling color temperatures of two-color COB to be consistent during color mixing Download PDFInfo
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Abstract
本发明涉及双色COB调色温技术领域，特别涉及一种使双色COB混色时色温一致的控制方法；包括：S1.在并联有色温值不同的第一LED芯片、第二LED芯片双色COB电路中，对第一LED芯片串联第一开关管，对第二LED芯片串联第二开关管，匹配既定的且互补的导通占空比分别给第一开关管、第二开关管，以此控制流过第一LED芯片、第二LED芯片的电流比值，实现第一LED芯片、第二LED芯片的亮度比例，进而实现双色COB混色输出既定色温值；S2.匹配既定的且互补的导通占空比分别给第一开关管、第二开关管的方法；本发明可以实现LED灯具色温的准确控制，使得同一批次灯具的色温一致性好，即各个灯具的光源颜色一致。
The present invention relates to the technical field of two-color COB color temperature adjustment, and in particular to a control method for making the color temperature of two-color COB consistent when mixing colors; comprising: S1. In a two-color COB circuit having a first LED chip and a second LED chip with different color temperature values connected in parallel, a first switch tube is connected in series with the first LED chip, and a second switch tube is connected in series with the second LED chip, and a predetermined and complementary conduction duty cycle is matched to the first switch tube and the second switch tube respectively, so as to control the current ratio flowing through the first LED chip and the second LED chip, realize the brightness ratio of the first LED chip and the second LED chip, and then realize the two-color COB mixed color output predetermined color temperature value; S2. A method for matching the predetermined and complementary conduction duty cycle to the first switch tube and the second switch tube respectively; the present invention can realize accurate control of the color temperature of LED lamps, so that the color temperature consistency of lamps in the same batch is good, that is, the light source color of each lamp is consistent.
Description
Technical Field
The invention relates to the technical field of color temperature mixing of a double-color COB, in particular to a control method for enabling color temperatures of the double-color COB to be consistent during color mixing.
Background
In the lighting industry, a bicolor COB light source is an LED lamp bead formed by mixing and packaging LED chips with two different color temperatures, and is generally used in application scenes needing to provide heating light and cold light effects at the same time. The light source has excellent color and temperature adjusting capability, and the color temperature and the brightness of emitted light can be controlled by adjusting the current of two LED chips according to different requirements and scenes. The simpler method is to control the current values of the two LED chips by stringing different resistance values so as to realize the control of the brightness proportion, but the control mode has a deviation value of the resistance and a deviation value of the forward voltage VF value of the lamp bead, so that the consistency of color temperatures among lamps is poor in batch production, namely, the color of light sources of 10 lamps possibly are inconsistent after the current is supplied among 10 lamps produced in the same batch, and the requirement of customers on products cannot be met.
In the prior art, a patent document with the grant bulletin number of CN108834261B discloses a circuit control system and a method with adjustable color temperature of mixed light, wherein the patent document is provided with two driving sources, a first driving source and a second driving source, is in a constant voltage mode, has higher cost and is not beneficial to product marketing, the patent document with the grant bulletin number of CN107113940B discloses a correlated color temperature control system and a method, the patent document is provided with a constant voltage power supply for supplying power to an LED, and is connected with a resistor in series in an LED loop and limiting current, the technical scheme has small competitiveness in the market pursuing energy conservation and high efficiency at present, and the patent document is provided with two paths of control signals, one path of control color temperature and one path of control brightness, has a complex control structure and is not energy-saving and high-efficiency. A control method for enabling color temperatures of two-color COB to be consistent during color mixing is provided to solve the problems in the prior art.
Disclosure of Invention
The invention aims to provide a control method for enabling color temperatures to be consistent during color mixing of a double-color COB, which aims to solve the problem that in the prior art, the current values of two LED chips are controlled through a series resistor, so that the control of brightness proportion is realized, and the light source colors of a plurality of lamps produced in the same batch are inconsistent in the control mode.
The technical scheme of the invention is that the control method for enabling the color temperature of the two-color COB to be consistent during color mixing comprises the following steps:
S1, in a double-color COB circuit which is connected with a first LED chip and a second LED chip in parallel and has different color temperature values, a first switching tube is connected in series with the first LED chip, a second switching tube is connected in series with the second LED chip, and a given complementary on duty ratio is matched with the first switching tube and the second switching tube respectively, so that the ratio of currents flowing through the first LED chip and the second LED chip is controlled, the brightness ratio of the first LED chip and the second LED chip is realized, and the double-color COB color mixing output of a given color temperature value is further realized;
S2, matching established and complementary conduction duty ratios to the first switching tube and the second switching tube respectively, wherein the method comprises the following steps:
S21, testing actual color temperature values of a first LED chip and a second LED chip in the bicolor COB under different current ratios, setting nominal current of the bicolor COB as HmA, gradually increasing current flowing through the first LED chip from 0mA to HmA, gradually reducing current flowing through the second LED chip from HmA to 0mA correspondingly, wherein the rising and falling steps of the current flowing through the first LED chip and the second LED chip are 5% -12% of HmA, and in each test experiment, the sum of the current flowing through the first LED chip and the current flowing through the second LED chip is equal to HmA;
s22, storing the conditions and results of each test experiment in a one-to-one correspondence list;
s23, generating a graph by taking a current value as an X coordinate and a color temperature value as a Y coordinate according to the corresponding relation between the current value flowing through the first LED chip or the current value flowing through the second LED chip in the table and the actual color temperature value obtained through testing;
s24, fitting a unitary quadratic polynomial function according to a trend line of the graph by taking an X axis as an independent variable and a Y axis as a dependent variable;
S25, obtaining the current ratio of any color temperature value in the interval between the color temperature value of the first LED chip and the color temperature value of the second LED chip through the first LED chip and the second LED chip through a unitary quadratic polynomial function, and further obtaining the conduction duty ratio which is matched with the established and complementary for the first switching tube and the second switching tube respectively;
S26, installing the double-color COB in the whole lamp, and correcting the conduction duty ratios which are matched with the established and complementary conduction duty ratios respectively for the first switch tube and the second switch tube through actually measuring the color temperature value of the whole lamp.
Preferably, the first switching tube and the second switching tube are any one of a MOSFET tube, a power switch and a triode.
Preferably, in step S21, the steps of rising and falling the current flowing through the first LED chip and the second LED chip are both 10% of HmA.
Preferably, the output end of the dual-color COB circuit is connected with a frequency modulation main control chip, the frequency modulation main control chip generates a pair of complementary PWM waveforms to control the on duty ratio of the first switching tube and the second switching tube, the main control chip is set to control the on duty ratio of the first switching tube to be D1, and the main control chip is set to control the on duty ratio of the second switching tube to be D2, so that d1+d2=1.
Preferably, the frequency modulation main control chip is any one of a frequency modulation chip and an MCU chip.
Preferably, a toggle switch is arranged in the bicolor COB circuit.
Compared with the prior art, the invention has the advantages that:
According to the invention, the first switching tube is connected in series with the first LED chip and the second switching tube is connected in series with the second LED chip in series with the first LED chip and the second LED chip in the dual-color COB circuit with different color temperature values, the given and complementary on duty ratios are matched with the first switching tube and the second switching tube respectively, so that the ratio of currents flowing through the first LED chip and the second LED chip is controlled, the brightness ratio of the first LED chip and the second LED chip is realized, and the dual-color COB color mixing is realized, and the given color temperature value is further realized.
Drawings
The invention is further described below with reference to the accompanying drawings and examples:
FIG. 1 is a table arrangement of relevant data of actual color temperature values of a first LED chip and a second LED chip under different current ratios in a dual-color COB according to the embodiment;
FIG. 2 is a graph of generating a unitary quadratic polynomial function by using the value of the current flowing through the first LED chip of COB1 as the X coordinate and the average value of the actual color temperature values of COB1 and COB2 as the Y coordinate, and simultaneously using the X axis as the independent variable and the Y axis as the dependent variable according to the graph;
Fig. 3 is a table arrangement of data of actual color values of the actual measured whole lamp, wherein five groups of on duty ratios are configured for the first switching tube and the second switching tube in the embodiment;
FIG. 4 is a table arrangement of the theoretical color temperature value after fine tuning the on duty ratio in FIG. 3 and the data of the difference value from the actual color temperature of the whole lamp according to the present embodiment;
FIG. 5 is a table arrangement of the theoretical color temperature values after fine tuning of the on-duty ratio in FIG. 4 and the calculated data of the color temperature values of the whole lamp according to the present embodiment;
FIG. 6 is a table arrangement of data of measured whole lamp color temperature values after fine adjustment of the on duty ratio in FIG. 5 according to the present embodiment;
Fig. 7 is a table arrangement of data of range values of on duty ratio of a first switching tube connected in series with a first LED chip and a second switching tube connected in series with a second LED chip when the final finalized lamp has five color temperatures of 2700K, 3000K, 3500K, 4000K, 5700K;
Fig. 8 is a circuit schematic diagram of the dual-color COB circuit according to the present embodiment.
The frequency modulation main control circuit comprises a toggle switch 1, a toggle switch 2, a frequency modulation main control chip 3, a first switching tube 4, a second switching tube 5, a second LED chip 6 and a first LED chip.
Detailed Description
The following describes the present invention in further detail with reference to specific examples:
In the description of the invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
A control method for making color temperatures uniform when two-color COB mix colors, comprising:
S1, in a double-color COB circuit which is connected with a first LED chip 6 and a second LED chip 5 in parallel and different in color temperature value, a first switch tube 3 is connected in series with the first LED chip 6, a second switch tube 4 is connected in series with the second LED chip 5, a given complementary conduction duty ratio is matched to the first switch tube 3 and the second switch tube 4 respectively, so that the ratio of currents flowing through the first LED chip 6 and the second LED chip 5 is controlled, the brightness ratio of the first LED chip 6 and the second LED chip 5 is realized, and the double-color COB color mixing output given color temperature value is further realized;
S2, matching established and complementary on duty ratios to the first switching tube 3 and the second switching tube 4 respectively, wherein the method comprises the following steps:
S21, testing actual color temperature values of the first LED chip 6 and the second LED chip 5 in the bicolor COB under different current ratios, setting nominal current of the bicolor COB as HmA, gradually increasing current flowing through the first LED chip 6 from 0mA to HmA, gradually reducing current flowing through the second LED chip 5 from HmA to 0mA correspondingly, and increasing and decreasing current flowing through the first LED chip 6 and the second LED chip 5 respectively by 5% -12% of HmA, wherein in consideration of experiment times and experiment accuracy, the current increasing and decreasing steps of the first LED chip 6 and the second LED chip 5 in the step S21 are preferably 10% of HmA.
And in each test experiment, the sum of the current flowing through the first LED chip 6 and the current flowing through the second LED chip 5 is equal to HmA;
s22, storing the conditions and results of each test experiment in a one-to-one correspondence list;
s23, generating a graph by taking a current value as an X coordinate and a color temperature value as a Y coordinate according to the corresponding relation between the current value flowing through the first LED chip 6 or the current value flowing through the second LED chip 5 in the table and the actual color temperature value obtained through testing;
s24, fitting a unitary quadratic polynomial function according to a trend line of the graph by taking an X axis as an independent variable and a Y axis as a dependent variable;
S25, obtaining the current ratio of any color temperature value in the interval between the color temperature value of the first LED chip 6 and the color temperature value of the second LED chip 5, which is required to flow through the first LED chip 6 and the second LED chip 5, through a unitary quadratic polynomial function, and further obtaining the conduction duty ratio which is matched with a given and complementary state for the first switching tube 3 and the second switching tube 4 respectively;
S26, installing the double-color COB in the whole lamp, and correcting the conduction duty ratios which are matched with the established and complementary conduction duty ratios respectively for the first switching tube 3 and the second switching tube 4 by actually measuring the color temperature value of the whole lamp.
The output end of the bicolor COB circuit is connected with a frequency modulation main control chip 2, the frequency modulation main control chip 2 generates a pair of complementary PWM waveforms to control the on duty ratio of the first switching tube 3 and the second switching tube 4, the main control chip is set to control the on duty ratio of the first switching tube 3 to be D1, and the main control chip controls the on duty ratio of the second switching tube 4 to be D2, so d1+d2=1. The frequency modulation main control chip 2 is any one of a frequency modulation chip and an MCU chip.
Specifically, a method of matching predetermined and complementary on duty ratios to the first switching tube 3 and the second switching tube 4 respectively will be described in detail by taking a dual-color COB with a nominal current of 1000mA and 40W as an example; in the embodiment, when the actual color temperature values of the first LED chip 6 and the second LED chip 5 in the two-color COB are tested under different current ratios, two identical double-color COBs with the nominal current of 1000mA are adopted for testing, and finally the average value of the actual color temperature values of the two double-color COBs is taken, wherein the color temperature of the first LED chip 6 in the two identical double-color COBs is 2700K, the color temperature of the second LED chip 5 is 5700K, the two identical double-color COBs are respectively marked as COB1 and COB2, the currents flowing through the first LED chip 6 in the COB1 and the COB2 are gradually increased from 0mA to 1000mA, the currents flowing through the second LED chip 5 are correspondingly reduced from 1000mA to 0mA, and the corresponding test results of the two identical double-color COB are obtained by a graph of 1 mA and a step-to-step test result of 50mA, and a step-by-step test result of each test table is obtained.
The average value data of the current flowing through the COB1 first LED chip 6 and the actual color temperature values of COB1 and COB2 in fig. 1 are tabulated, a graph (as shown in fig. 2) is generated by excel, wherein the current value flowing through the COB1 first LED chip 6 is taken as an X coordinate, the average value of the actual color temperature values of COB1 and COB2 is taken as a Y coordinate, and meanwhile, the excel can be fitted with a unitary quadratic polynomial function by taking the X axis as an independent variable and the Y axis as a dependent variable according to the graph: According to the unitary quadratic polynomial function, the current value x, x/1000 of the first LED chip 6 flowing through COB1 can be obtained by solving the known required color temperature value y, i.e. the on-duty ratio of the first switching tube 3 connected in series with the first LED chip 6 is required, and 1-x/1000 is the on-duty ratio of the second switching tube 4 connected in series with the second LED chip 5 is required.
It should be noted that, the above-mentioned unitary quadratic polynomial function is directed against the bicolor COB, but the bicolor COB needs to be installed in a lamp for use, secondary optics (such as a reflector cup and a shade) outside the lamp has an influence on the color temperature, and the color temperature of the light emitted by the bicolor COB has a certain deviation value after passing through the secondary optics, so that in order to overcome the deviation value, the color temperature of the bicolor COB needs to be compensated; the specific color temperature compensation method for the double-color COB is described as follows, wherein the conditions are that the double-color COB is 40W, the nominal current is 1000mA, the color temperature of a first LED chip 6 in the double-color COB is 2700K, the color temperature of a second LED chip 5 in the double-color COB is 5700K, and the required color temperature of the whole lamp is 2700K, 3000K, 3500K, 4000K and 5700K for 5 gears in total; the control method for making the color temperatures consistent during the dual-color COB color mixing in the embodiment is applied to the whole lamp, firstly, a first group 1 and 0 are respectively configured for a first switch tube 3 connected in series with a first LED chip 6 and a second switch tube 4 connected in series with a second LED chip 5, a second group 0.876 and 0.124, a third group 0.682 and 0.318, a fourth group 0.53 and 0.47 and a fifth group 0.09 and 0.91 are respectively configured for the first switch tube, the whole lamp with the same configuration is adopted for experiment, the average value of the measured color temperatures of the three groups of whole lamps is taken as shown in figure 3, secondly, the on-duty ratio is finely adjusted according to the average value of the color temperatures of the three groups of whole lamps in the first step, as shown in figure 4, the left-side duty ratio in each group is provided for the first switch tube 3 and the right-side is provided for the second switch tube 4, compared with the first group in figure 3 and the first group of the duty ratio in figure 4, the first group 6 is not rounded off for the first LED chip in figure 3 and the second group 0.876 is rounded off to the first LED chip in figure 3, the corresponding change of 0.124 of the second group in fig. 3 to 0.12, the corresponding increase of 0.682 of the third group in fig. 3 to 0.69, the corresponding decrease of 0.318 of the third group in fig. 3 to 0.31, the fourth group unchanged, the decrease of 0.09 of the fifth group in fig. 3 to 0.08,0.91 to 0.92 in order to increase the color temperature by a little, the theoretical color temperature value in fig. 4, i.e. the actual duty cycle in fig. 4 is brought into a unitary quadratic polynomial function, taking into account the large gap between the 3-order measured whole lamp color Wen Junzhi 3305.333K and the required color temperature point 3500K in the third group in fig. 3: The difference between the color temperature of the dual-color COB and the actual measured color temperature of the whole lamp in fig. 4, that is, the difference between the theoretical color temperature value in fig. 4 and the color temperature average value of the 3 times of actual measured whole lamps in fig. 3, is very small, so that the actual duty ratio in fig. 4 is very small from the actual duty ratio in fig. 3, the actual duty ratio in fig. 3 in the first step can be adopted in the second step to carry out fine adjustment on the actual duty ratio in fig. 3 continuously as required, the color temperature value of the whole lamp is closer to the required color temperature point, the fine adjustment on the specific duty ratio is shown in fig. 5, and the theoretical color temperature value in fig. 5 is that the actual duty ratio in fig. 5 is brought into a unitary quadratic polynomial function: The color temperature of the dual-color COB; the color temperature value of the whole lamp in fig. 5 is obtained by subtracting the difference value between the theoretical color temperature value in fig. 5 and the actual measured color temperature of the whole lamp in fig. 4, namely the calculated color temperature value of the whole lamp; in the fourth step, the actual duty ratio in fig. 5 is finely adjusted according to the color temperature value of the whole lamp in fig. 5, and the fine adjustment of the specific duty ratio is shown in fig. 6. In this step, two groups of whole lamps with the same configuration are adopted for experiments, and the average value of the actually measured color temperatures of the two groups of whole lamps is taken, until the fine adjustment in the fourth step can reach the expected color temperature interval, fig. 7 is the range value of the on duty ratio of the first switching tube 3 connected in series with the first LED chip 6 and the second switching tube 4 connected in series with the second LED chip 5 when the final setting is that the whole lamp has five-gear color temperatures of 2700K, 3000K, 3500K, 4000K and 5700K.
The control method for enabling the color temperature of the double-color COB to be consistent during color mixing has the advantages that only one driving source is used, the cost is optimized, the market of products is facilitated, meanwhile, the color temperature of the whole lamp is accurately controlled through the color temperature control loop at the rear section of the driving source, energy is saved, efficiency is improved, the color temperature accuracy is high, the color temperature consistency among different lamps can be guaranteed, and the control method is accepted by the market. The invention can realize the control of brightness directly by changing the output current of the driving source, is convenient and flexible, and does not need to design a control circuit for controlling brightness.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same according to the content of the present invention, and are not intended to limit the scope of the present invention. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore desired that the present invention be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
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| US20240373525A1 (en) * | 2023-05-04 | 2024-11-07 | Leedarson Lighting Co.,Ltd. | Lighting apparatus |
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| CN1883239A (en) * | 2003-11-14 | 2006-12-20 | 皇家飞利浦电子股份有限公司 | Method and device for driving a metal halide lamp |
| CN105491761A (en) * | 2015-12-29 | 2016-04-13 | 生迪智慧科技有限公司 | LED lamp capable of adjusting color temperature and color temperature adjustment method for LED lamp |
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