A method for adjusting the light color of an LED lighting lamp, its light source and adjusting device

Abstract

A method for adjusting the light color of an LED lighting lamp, its light source and adjusting device. The present invention is to solve the problems existing in the prior art, such as reducing the color rendering index, the complexity of the light color control method, and the poor smoothness and linearity of the adjustment change track of the mixed light color temperature. Technical key points: The method uses three or more different color temperature LED light sources with the color temperature values of white light sources decreasing from high to low. By adjusting the device, the brightness ratio of each two adjacent different color temperature LED white light sources arranged in order from high to low or from low to high is controlled to change, and continuously changing different color temperature mixed illumination light is obtained. And when the brightness ratio of a certain color temperature light source in the first group of light sources is adjusted to 0, another color temperature light source and another adjacent color temperature light source form the light sources for the second group of adjustment, and the control is carried out in sequence. The light source is characterized in that the light-emitting chips are composed of three or more different color temperatures mixed and evenly distributed. The adjusting device is characterized by being composed of a brightness ratio adjusting circuit, a control circuit, a first driving circuit and a second driving circuit, etc.

Description

Technical Field

[0001] The present invention relates to the improvement of the dimming technology of LED lighting lamps, in particular to a method for adjusting the light color of an LED lighting lamp, its light source and an adjusting device. Background Art

[0002] At present, the commonly used LED lighting lamps that can adjust different color temperatures of white light often install more than two light sources with different color temperatures in the lamp body. By making the different light sources emit light independently or simultaneously, three selectable color temperatures of illumination light can be obtained. However, the color temperature selectivity of this method is limited and the color temperature change is discontinuous, and users cannot obtain any desired color temperature of illumination light through adjustment.

[0003] Currently, there have emerged lighting lamps that install two light sources with different color temperatures in the lamp body and mix various continuously changing different color temperature illumination lights between these two different color temperatures by adjusting the brightness ratio of the two light-emitting chips with different color temperatures. However, the blackbody locus line that reflects the white light color temperature change trajectory on the chromatogram is an upward-arching arc, while the continuous white light color temperature change trajectory obtained by adjusting the brightness ratio of any two different color temperature points through the circuit is a straight line connecting these two color temperature points. That is, the white light color temperature points obtained by mixing the lights of two different color temperature points with a relatively large distance through circuit adjustment of their respective brightness ratios are all below the blackbody locus. Since the area below the blackbody locus is the red area of the chromatogram, the illumination light mixed in this way will all be reddish and not standard white light, and this deviation will have an adverse effect in professional requirements such as photography and taking pictures.

[0004] A method for controlling the light color of an LED lamp disclosed in Chinese Patent No. 202110748926.9, the structure includes selecting a high-color-temperature light source, a low-color-temperature light source, and a green light source as the light sources for simultaneous mixing, configuring an MCU processor and three DC / DC constant-current circuits, and the outputs of the MCU processor are respectively connected to the inputs of the three DC / DC constant-current circuits, and the outputs of the three DC / DC constant-current circuits are respectively connected to the high-color-temperature light source, the low-color-temperature light source, and the green light source; by adjusting the MCU processor to send PWM signals with a certain duty cycle to the high-color-temperature light source, the low-color-temperature light source, and the green light source, and the sum of the three duty cycles is 100%, so that the mixed light source falls on the color temperature line of the blackbody locus in the chromatogram and changes from low color temperature to high color temperature, so as to obtain the required standard color temperature. However, the disadvantages of this solution are: first, the green light source will reduce the color rendering index of the illumination light, making the illumination light deviate significantly from the natural light effect; second, the light color control method is complex, which will inevitably result in a complex control device (circuit) and a high cost; third, the smoothness and linearity of the mixed light color temperature adjustment change trajectory are poor, and problems such as unstable light color jitter and difficulty in adjusting accurately will occur during adjustment, and adverse effects will also be produced in professional requirements such as photography and photography. Summary of the Invention

[0005] In order to overcome the problems existing in the prior art, such as reducing the color rendering index of the illumination light, complex light color control method, complex control device (circuit) and high cost, poor smoothness and linearity of the mixed light color temperature adjustment change trajectory, and unstable light color jitter and difficulty in adjusting accurately during adjustment, the purpose of the present invention is to provide an improved method for adjusting the light color of an LED lighting lamp, its light source and adjustment device, which can overcome the defects of the prior art.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: A method for adjusting the light color of an LED lighting lamp, which uses more than three different color temperature LED light sources with color temperature values ranging from high to low, and controls the change of the brightness ratio of the color temperature values ranging from high to low or from low to high through a light color adjustment device to obtain continuously changing mixed lighting light of different color temperatures. The characteristics are: The more than three different color temperature LED light sources with color temperature values ranging from high to low adopted by the light color adjustment method are all LED white light sources. Through the light color adjustment device, the change of the brightness ratio of each two adjacent different color temperature LED white light sources arranged in order from high to low or from low to high is controlled to obtain continuously changing mixed lighting light of different color temperatures. And when the brightness ratio of one of the two adjacent different color temperature LED white light sources in the first group is adjusted to 0, the other LED white light source and another adjacent different color temperature LED white light source form the two adjacent different color temperature LED white light sources for the second group of adjustment, that is, when the brightness of the one LED white light source is adjusted to 0, the brightness of the other different color temperature LED white light source is turned on, and sequential control is carried out in turn. The entire color temperature value change trajectory is obtained by mixing two adjacent different color temperature LED white light sources.

[0007] The more than three different color temperature LED white light sources described in the above technical solution can be three different color temperature LED white light sources using high color temperature LED white light sources, medium color temperature LED white light sources, and low color temperature LED white light sources. The control sequence is to first control the change of the respective brightness ratio values of the first group of two adjacent different color temperature LED white light sources composed of the high color temperature LED white light source and the medium color temperature LED white light source. When the brightness ratio value of the high color temperature LED white light source is adjusted to 0, the medium color temperature LED white light source and the low color temperature LED white light source form the second group of two adjacent different color temperature LED white light sources for continuous adjustment, that is, when the brightness ratio value of the high color temperature LED white light source is adjusted to 0, the brightness ratio value of the low color temperature LED white light source is turned on.

[0008] The more than three different color temperature LED white light sources described in the above technical solution can be three different color temperature LED white light sources using low color temperature LED white light sources, medium color temperature LED white light sources, and high color temperature LED white light sources. The control sequence is to first control the change of the respective brightness ratio values of the first group of two adjacent different color temperature LED white light sources composed of the low color temperature LED white light source and the medium color temperature LED white light source. When the brightness ratio value of the low color temperature LED white light source is adjusted to 0, the medium color temperature LED white light source and the high color temperature LED white light source form the second group of two adjacent different color temperature LED white light sources for continuous adjustment, that is, when the brightness ratio value of the low color temperature LED white light source is adjusted to 0, the brightness ratio value of the high color temperature LED white light source is turned on.

[0009] A light source using the light color adjustment method of the LED lighting lamp described in the above technical solution, comprising a substrate and a plurality of light-emitting chips of LED white light sources fixedly arranged on the substrate, characterized in that: the plurality of light-emitting chips are composed of a mixture of more than three different color temperature light-emitting chips and are evenly distributed, and the plurality of light-emitting chips can be densely arranged on the substrate row by row and column by column. All the light-emitting chips on one row of light-emitting chips are of the same color temperature, then more than three different color temperature light-emitting chips are arranged alternately in rows on the light-emitting area. All the light-emitting chips on one column of light-emitting chips are of the same color temperature, then more than three different color temperature light-emitting chips are arranged alternately in columns on the light-emitting area. On the light-emitting area where more than three different color temperature light-emitting chips are arranged alternately in rows, short columns of more than three different color temperature light-emitting chips arranged alternately are provided on the upper and lower side regions of the light-emitting area. On the light-emitting area where more than three different color temperature light-emitting chips are arranged alternately in columns, short rows of more than three different color temperature light-emitting chips arranged alternately are provided on the left and right side regions of the light-emitting area.

[0010] The light-emitting area described in the above technical solution may be composed of the middle area of the light-emitting area where more than three different color temperature light-emitting chips are arranged alternately in rows and the upper and lower side regions of the light-emitting area where short columns of more than three different color temperature light-emitting chips are arranged alternately, or may be composed of the middle area of the light-emitting area where more than three different color temperature light-emitting chips are arranged alternately in columns and the left and right side regions of the light-emitting area where short rows of more than three different color temperature light-emitting chips are arranged alternately.

[0011] When short columns of more than three different color temperature light-emitting chips arranged alternately are provided on the upper and lower side regions of the light-emitting area described in the above technical solution, the short columns of light-emitting chips can be respectively connected to the rows of light-emitting chips of the same color temperature at their inner ends.

[0012] When short rows of more than three different color temperature light-emitting chips arranged alternately are provided on the left and right side regions of the light-emitting area described in the above technical solution, the short rows of light-emitting chips can be respectively connected to the columns of light-emitting chips of the same color temperature at their inner ends.

[0013] A reflective layer may be coated on the front surface of the substrate described in the above technical solution.

[0014] An adjusting device for the light color adjusting method of the LED lighting lamp described in the above technical solution, characterized in that it includes a brightness ratio adjusting circuit, a control circuit, a first driving circuit, a second driving circuit, several groups of LED white light sources with different color temperatures, and several grounding switch circuits, wherein the color temperatures of the LED white light sources in the same group are the same, and the several groups of LED white light sources with different color temperatures are numbered as the first group of LED white light sources, the second group of LED white light sources, the third group of LED white light sources, the fourth group of LED white light sources... in the order from low color temperature to high color temperature or from high color temperature to low color temperature. The adjusting control signal output end of the brightness ratio adjusting circuit is connected to the adjusting control signal input end of the control circuit. The first driving control signal output end and the second driving control signal output end of the control circuit are respectively connected to the driving control signal input ends of the first driving circuit and the second driving circuit. The power output end of the first driving circuit is connected to the positive poles of the first group of LED white light sources, the third group of LED white light sources... The power output end of the second driving circuit is connected to the positive poles of the second group of LED white light sources, the fourth group of LED white light sources... The negative pole of each group of LED white light sources is connected to an independent grounding switch circuit to be grounded. The several switch control signal output ends of the control circuit are respectively connected to the switch control signal input ends of each grounding switch circuit, and the working sequence of the several grounding switch circuits is to first turn on the first and second groups of LED white light sources for mixed light color temperature adjustment, turn off the first group of LED white light sources when the brightness of the first group of LED white light sources is adjusted to zero, turn on the third group of LED white light sources at the same time to continue the mixed light color temperature adjustment, turn off the second group of LED white light sources when the brightness of the second group of LED white light sources is adjusted to zero, turn on the fourth group of LED white light sources at the same time and then continue the mixed light color temperature adjustment...

[0015] The first group of LED white light sources, the third group of LED white light sources... described in the above technical solution can be connected in parallel, the second group of LED white light sources, the fourth group of LED white light sources... can be connected in parallel, and each group of LED white light sources can be composed of several LED white light sources connected.

[0016] When there are only the first, second, and third groups of LED white light sources among the several groups of LED white light sources with different color temperatures described in the above technical solution, the negative pole of the second group of LED white light sources can be directly grounded without connecting to the grounding switch circuit to be grounded.

[0017] The control circuit described in the above technical solution can be correspondingly connected and composed of a high-performance and low-power microcontroller integrated circuit with a DSP instruction set of the M483SIDAE type and its peripheral components.

[0018] The beneficial effects of the present invention are as follows: First, in the light color adjustment method, since the light sources used are all white light sources, the illumination light adjusted will not have the problem of significantly reducing the color rendering index. Second, in the light color adjustment method, since three or more different color temperature LED white light sources with color temperature values from high to low are used, and the light color adjustment device sequentially controls the change of the brightness ratio of each two adjacent different color temperature LED white light sources arranged in order from high to low or from low to high in color temperature value, continuously changing mixed illumination light with different color temperatures is obtained. Therefore, the change trajectory of the color temperature value obtained by the mixed light adjustment is quite close to the blackbody trajectory of the spectral diagram, so that the illumination light obtained by the mixed light adjustment is no longer significantly reddish, which can effectively improve the illumination quality required for professional applications such as photography and photo taking. Moreover, the entire change trajectory of the color temperature value is obtained by mixing two adjacent different color temperature LED white light sources, so the smoothness and linearity of the color temperature adjustment change trajectory are very ideal, and there will be no problem of unstable light color jumping or difficult to adjust accurately during adjustment. Third, since the light sources of the light color adjustment method are composed of a mixture of three or more different color temperature light-emitting chips and are evenly distributed, they are suitable for the light color adjustment method. In particular, the densely arranged light-emitting chip method can be adopted, and on the light-emitting area, the long rows of light-emitting chips with three different color temperatures are arranged alternately, and on the upper and lower side regions of the light-emitting area, short columns of light-emitting chips with three different color temperatures arranged alternately are provided. On the left and right side regions of the light-emitting area composed of columns of light-emitting chips with three different color temperatures arranged alternately, short rows of light-emitting chips with three different color temperatures arranged alternately are provided, thus solving the problem that there will be a difference in mixed light intensity in the upper and lower side regions or the left and right side regions of the light spot of the high-efficiency high-power LED white light source with a reflective layer coated on the substrate, making the mixed light of the entire light spot very uniform and effectively improving the illumination quality. Fourth, since the adjustment device of the light color adjustment method controls two groups of different color temperature LED white light sources arranged alternately in series through two drive circuits, and an independent grounding switch circuit is set for each group of LED white light sources, and the control circuit controls the sequential conduction of one kind of LED white light source in each of the two series of different color temperature LED white light source groups, so that the brightness ratio of each two adjacent different color temperature LED white light sources is continuously changed, and the obtained is continuously changing mixed illumination light adjusted by two different color temperatures, ensuring the ideal implementation of the light color adjustment method using three or more different color temperature white light LED white light sources with color temperature values from high to low.

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Description of the Drawings

[0020] Figure 1 It is a schematic diagram on the blackbody trajectory of the existing method of mixed light adjustment using only two different color temperature light sources.

[0021] Figure 2 It is a schematic diagram of a method for adjusting light color using three different color temperature light sources of the present invention on the blackbody locus.

[0022] Figure 3 It is a schematic diagram of a closely arranged light source used in a method for adjusting light color using three different color temperature light sources of the present invention.

[0023] Figure 4 It is a block schematic diagram of an adjusting device of the present invention.

[0024] Figure 5 It is Figure 4 a schematic diagram of the adjustment sequence.

[0025] Figure 6 It is Figure 4 a schematic diagram of a circuit principle.

[0026] In the figure: A, blackbody locus; B, the changing locus of the color temperature value obtained by mixed light adjustment; 1, substrate; 2, LED light-emitting chip (low color temperature LED light-emitting chip); 3, medium color temperature LED light-emitting chip; 4, high color temperature LED light-emitting chip; 5, column of low color temperature LED light-emitting chips; 6, column of medium color temperature LED light-emitting chips; 7, column of high color temperature LED light-emitting chips; 8, light-emitting area; 9, left side area of the light-emitting area; 10, right side area of the light-emitting area; 11, short row of low color temperature LED light-emitting chips; 12, short row of medium color temperature LED light-emitting chips; 13, short row of high color temperature LED light-emitting chips; 14, brightness ratio adjustment circuit; 15, control circuit; 16, first drive circuit; 17, second drive circuit; 18, LED white light source group (first group of LED white light sources); 19, second group of LED white light sources; 20, third group of LED white light sources; 21, fourth group of LED white light sources; 22, grounding switch circuit (first grounding switch circuit); 23, grounding switch circuit (second grounding switch circuit); 24, grounding switch circuit (third grounding switch circuit); 25, grounding switch circuit (fourth grounding switch circuit). Specific embodiments

[0027] Referring to Figure 1 , the blackbody locus representing the white light area distribution on the chromatogram is the solid line A. For the existing method of mixed light adjustment using only two different color temperature light sources with color temperature values of 5600k and 3200k, the changing locus of the color temperature value obtained by mixed light adjustment is the dashed line B. It can be seen that the distance between the middle part of the dashed line B and the blackbody locus A is relatively large. Since the lower side of the blackbody locus A is the red area on the chromatogram, the illumination light obtained by mixed light adjustment using only two different color temperature light sources will be significantly reddish.

[0028] Referring to Figure 2, the method for adjusting the light color of the LED lighting lamp described herein uses three or more different color temperature LED light sources with color temperature values from high to low, namely 5600k, 4400k, and 3200k. By controlling the change in the brightness ratio of the color temperature value from high to low or from low to high through a light color adjustment device, continuously varying mixed lighting light with different color temperatures is obtained. Its characteristics are: The three or more different color temperature LED light sources with color temperature values from high to low, namely 5600k, 4400k, and 3200k, used in the light color adjustment method are all LED white light sources. According to Figure 2 As shown, the brightness ratio changes of each two adjacent different color temperature LED white light sources arranged in ascending order of color temperature value are sequentially controlled to obtain continuously varying mixed lighting light with different color temperatures. And when the brightness ratio value of the 3200k low color temperature LED white light source in the two adjacent different color temperature LED white light sources of 3200k and 4400k in the first group is adjusted to 0, the 4400k LED white light source and the adjacent 5600k high color temperature LED white light source form the two adjacent different color temperature LED white light sources for the second group of adjustment. That is, when the brightness of the 3200k low color temperature LED white light source is adjusted to 0, the brightness of the 5600k high color temperature LED white light source is turned on. Sequentially controlling in this way, the entire color temperature value change trajectory is obtained by mixing light from two different adjacent different color temperature LED white light sources. From Figure 2 It can be seen that when sequential light mixing adjustment is performed using three different color temperature LED white light sources, the mixed light color temperature points on the color temperature value change trajectory B are all relatively close to the blackbody trajectory A. In this way, the different color temperature lighting lights obtained by adjustment will not be significantly reddish.

[0029] Referring to Figure 3 , the light source for the method of adjusting the light color of the LED lighting lamp using the above technical solution includes a substrate 1 and a number of LED light-emitting chips 2 fixedly arranged on the substrate 1, etc. The LED light-emitting chips 2, etc. are densely arranged in rows and columns on the substrate 1. Its characteristics are: The number of LED light-emitting chips 2 is divided into three types: low color temperature LED light-emitting chips 2, medium color temperature LED light-emitting chips 3, and high color temperature LED light-emitting chips 4. The color temperatures of all the LED light-emitting chips on the same column of LED light-emitting chips are the same. The light-emitting area 8 is composed of three types of alternately arranged low color temperature LED light-emitting chip columns 5, medium color temperature LED light-emitting chip columns 6, and high color temperature LED light-emitting chip columns 7. Low color temperature LED light-emitting chip short rows 11, medium color temperature LED light-emitting chip short rows 12, and high color temperature LED light-emitting chip short rows 13 are alternately arranged on the left and right side regions 9, 10 of the light-emitting area 8.

[0030] In addition, the short rows 11 of low-color-temperature LED light-emitting chips, the short rows 12 of medium-color-temperature LED light-emitting chips, and the short rows 13 of high-color-temperature LED light-emitting chips are respectively connected at their inner ends to the columns 5 of low-color-temperature LED light-emitting chips, the columns 6 of medium-color-temperature LED light-emitting chips, and the columns 7 of high-color-temperature LED light-emitting chips of the same color temperature that are closest to them.

[0031] A reflective layer is coated on the front surface of the substrate 1 described in the above technical solution.

[0032] Referring to Figure 4 , an adjustment device for the light color adjustment method of the LED lighting lamp using the above technical solution is characterized in that: it includes a brightness ratio adjustment circuit 14, a control circuit 15, a first drive circuit 16, a second drive circuit 17, several LED white light source groups 18, 19, 20, 21, etc. with different color temperatures, and several grounding switch circuits 22, 23, 24, 25, etc., where the color temperatures of the LED white light sources in the same group are the same. The several groups of LED white light sources with different color temperatures are numbered as the first group of LED white light sources 18, the second group of LED white light sources 19, the third group of LED white light sources 20, the fourth group of LED white light sources 21... in the order from low color temperature to high color temperature. The adjustment control signal output terminal a of the brightness ratio adjustment circuit 14 is connected to the adjustment control signal input terminal b of the control circuit 15. The first drive control signal output terminal c and the second drive control signal output terminal d of the control circuit 15 are respectively connected to the drive control signal input terminals e, f of the first drive circuit 16 and the second drive circuit 17. The power output terminal g of the first drive circuit 16 is connected to the positive electrodes h, j of the first group of LED white light sources 18, the third group of LED white light sources 20... The power output terminal k of the second drive circuit 17 is connected to the positive electrodes l, m of the second group of LED white light sources 19, the fourth group of LED white light sources 21... The negative electrodes n, o, p, q of the first group of LED white light sources 18, the second group of LED white light sources 19, the third group of LED white light sources 20, the fourth group of LED white light sources 21... are respectively connected to the respective independent grounding switch circuits 22, 23, 24, 25 to ground. The several switch control signal output terminals of the control circuit 15 are respectively connected to the switch control signal input terminals x, y, z, & of the grounding switch circuits 22, 23, 24, 25, and the working sequence of the several grounding switch circuits 22, 23, 24, 25 is to first turn on the first and second groups of LED white light sources 18 and 19 for mixed light color temperature adjustment. When the color temperature of the first group of LED white light sources 18 is adjusted to zero, turn off the first group of LED white light sources 18 and turn on the third group of LED white light sources 20 at the same time to continue the mixed light color temperature adjustment. When the color temperature of the second group of LED white light sources 19 is adjusted to zero, turn off the second group of LED white light sources 19 and turn on the fourth group of LED white light sources 21 at the same time to continue the mixed light color temperature adjustment...

[0033] In addition, the first group of LED white light sources 18, the third group of LED white light sources 20... are connected in parallel, the second group of LED white light sources 19, the fourth group of LED white light sources 21... are connected in parallel, and a number of LED white light sources are respectively connected in series to the first group of LED white light sources 18, the second group of LED white light sources 19, the third group of LED white light sources 20, the fourth group of LED white light sources 21...

[0034] When there are only the first group of LED white light sources 18, the second group of LED white light sources 19, and the third group of LED white light sources 20 among the several groups of LED white light sources 18, etc. with different color temperatures, the negative electrode of the second group of LED white light sources 19 is directly grounded without connecting to the grounding switch circuit to land.

[0035] The control circuit 15 is composed of a high-performance and low-power microcontroller integrated circuit with a DSP instruction set of the M483SIDAE type and its corresponding peripheral components connected.

[0036] Refer to Figure 5 , Figure 4 The working sequence of the several grounding switch circuits of the adjusting device is as follows: First, turn on the first group of LED white light sources and the second group of LED white light sources, then turn on the second group of LED white light sources and the third group of LED white light sources (at this time, the first group of LED white light sources is turned off), then turn on the third group of LED white light sources and the fourth group of LED white light sources (at this time, the second group of LED white light sources is turned off)... and so on in sequence.

[0037] Refer to Figure 6, an adjusting device for the light color adjusting method of the present LED lighting lamp, characterized in that: it includes a brightness ratio adjusting circuit 14 composed of a coding switch K1, resistors R1 to R3 and capacitors C1 to C2 connected according to the figure; a control circuit 15 composed of a high-performance and low-power microcontroller integrated circuit IC1 of the M483SIDAE type with a DSP instruction set and a capacitor C3 around it connected according to the figure; a first driving circuit 16 composed of a switching-mode LED driver integrated circuit IC2 of the LM3409 type, a field-effect transistor T1, resistors R4 to R9, capacitors C4 to C7, an inductor L1, and a diode D1 connected according to the figure; a second driving circuit 17 composed of a switching-mode LED driver integrated circuit IC3 of the LM3409 type, a field-effect transistor T2, resistors R10 to R15, capacitors C8 to C11, an inductor L2, and a diode D3 connected according to the figure; four LED white light source groups with different color temperatures, wherein the color temperatures of the LED white light sources in the same group are the same. The four groups of LED white light sources with different color temperatures are numbered in order from low color temperature to high color temperature as a first group of LED white light sources 18 composed of light-emitting diodes D5 to D6 connected in series, a second group of LED white light sources 19 composed of light-emitting diodes D7 to D8 connected in series, a third group of LED white light sources 20 composed of light-emitting diodes D9 to D10 connected in series, and a fourth group of LED white light sources 21 composed of light-emitting diodes D11 to D12 connected in series; four grounding switch circuits, wherein a first grounding switch circuit 22 is composed of a field-effect transistor T3, a triode Q1, resistors R16 to R18 and a capacitor C12 connected according to the figure, a second grounding switch circuit 23 is composed of a field-effect transistor T4, a triode Q3, resistors R19 to R21 and a capacitor C13 connected according to the figure, a third grounding switch circuit 24 is composed of a field-effect transistor T5, a triode Q2, resistors R22 to R24 and a capacitor C14 connected according to the figure, and a fourth grounding switch circuit 25 is composed of a field-effect transistor T6, a triode Q4, resistors R25 to R27 and a capacitor C15 connected according to the figure;The 1st and 3rd terminals of the adjustment control signal output terminal K1 of the brightness ratio adjustment circuit 14 are respectively connected to the 19th and 20th pins of the adjustment control signal input terminal IC1 of the control circuit 15. The 17th pin of the first drive control signal output terminal IC1 and the 18th pin of the second drive control signal output terminal IC1 of the control circuit 15 are respectively connected to the drive control signal input terminals R4 and R10 of the first drive circuit 16 and the second drive circuit 17. The power output terminal L1 of the first drive circuit 16 is connected to the positive electrodes of the first group of LED white light sources 18 and the third group of LED white light sources 20. The power output terminal L2 of the second drive circuit 17 is connected to the positive electrodes of the second group of LED white light sources 19 and the fourth group of LED white light sources 21. The negative electrodes of the first group of LED white light sources 18, the second group of LED white light sources 19, the third group of LED white light sources 20 and the fourth group of LED white light sources 21 are respectively connected to the first grounding switch circuit 22, the second grounding switch circuit 23, the third grounding switch circuit 24 and the fourth grounding switch circuit 25 to be grounded. The four switch control signal output terminals IC1 of the control circuit 15, namely the 11th to 14th pins, are respectively connected to the switch control signal input terminals R17, R20, R23 and R26 of the first grounding switch circuit 22, the second grounding switch circuit 23, the third grounding switch circuit 24 and the fourth grounding switch circuit 25. The working sequence of the first to fourth grounding switch circuits 22, 23, 24, 25 is to first turn on the first group of LED white light sources 18 and the second group of LED white light sources 19 for mixed light color temperature adjustment. When the brightness of the first group of LED white light sources 18 is adjusted to zero, turn off the first group of LED white light sources 18 and turn on the third group of LED white light sources 20 at the same time to continue mixed light color temperature adjustment. When the brightness of the second group of LED white light sources 19 is adjusted to zero, turn off the second group of LED white light sources 19 and turn on the fourth group of LED white light sources 21 at the same time to continue mixed light color temperature adjustment. When any two groups of LED white light sources are turned on at the same time, the brightness ratio of the two groups of LED white light sources is adjusted by K1 of the brightness ratio adjustment circuit 14 to be different, so as to achieve continuous change of the mixed light color temperature value.;

[0038] In addition, the working voltage V1 of the brightness ratio adjustment circuit 14, the working voltage V2 of the control circuit 15, the working voltage V3 of the first drive circuit 16, the working voltage V4 of the second drive circuit 17, the working voltage V5 of the first grounding switch circuit, the working voltage V6 of the first grounding switch circuit, the working voltage V7 of the first grounding switch circuit, and the working voltage V8 of the first grounding switch circuit are all provided by the power supply circuit (not shown) of the adjustment device of the light color adjustment method.

[0039] The first group of LED white light sources 18 and the third group of LED white light sources 20 are connected in parallel, and the second group of LED white light sources 19 and the fourth group of LED white light sources 21 are connected in parallel.

[0040] Referring to Figure 6 , if there are only three groups of LED white light sources with different color temperatures, and the four groups of LED white light sources with different color temperatures are numbered in ascending order of color temperature as the first group of LED white light sources 18 composed of light-emitting diodes D5 to D6 connected in series, the second group of LED white light sources 19 composed of light-emitting diodes D7 to D8 connected in series, and the third group of LED white light sources 20 composed of light-emitting diodes D9 to D10 connected in series, and there is no fourth group of LED white light sources 21, the negative electrode of the second group of LED white light sources 19 is directly grounded, and there is no need to provide a second grounding switch circuit 23 and a fourth grounding switch circuit 25. Moreover, the operating sequence of the first grounding switch circuit 22 and the third grounding switch circuit 24 is to first turn on the first group of LED white light sources 18 and the second group of LED white light sources 19 for mixed light color temperature adjustment. When the brightness of the first group of LED white light sources 18 is adjusted to zero, turn off the first group of LED white light sources 18 and turn on the third group of LED white light sources 20 at the same time to continue the mixed light color temperature adjustment. When any two groups of LED white light sources are turned on simultaneously, the change in the mixed light color temperature value of the different color temperatures of the two groups of LED white light sources is adjusted by K1 of the brightness ratio adjustment circuit 14.

Claims

1. A method for adjusting the light color of an LED lighting lamp, which uses more than three different color temperature LED light sources with color temperature values from high to low, and controls the change of the brightness ratio of the color temperature values from high to low or from low to high through a light color adjustment device to obtain continuously changing mixed illumination light of different color temperatures. The characteristics are as follows: All of the three or more LED light sources with different color temperatures from high to low used in the light color adjustment method are LED white light sources. By sequentially controlling the change in the brightness ratio of each two adjacent LED white light sources with different color temperatures arranged from high to low or from low to high through a light color adjustment device, continuously changing mixed illumination light with different color temperatures is obtained. And when the brightness ratio of one of the two adjacent LED white light sources in the first group is adjusted to 0, the other LED white light source and another adjacent LED white light source with a different color temperature form the two adjacent LED white light sources for the second group of adjustment, that is, when the brightness of one LED white light source is adjusted to 0, the brightness of the other LED white light source with a different color temperature is turned on. Sequentially controlling in this way, the entire color temperature change trajectory is obtained by mixing light from two different adjacent LED white light sources with different color temperatures.

2. The method for adjusting the light color of the LED lighting lamp according to claim 1, wherein The three or more LED white light sources with different color temperatures are three different color temperature LED white light sources, namely a low color temperature LED white light source, a medium color temperature LED white light source, and a high color temperature LED white light source. The control sequence is to first control and adjust the change in the respective brightness ratio of the two adjacent LED white light sources with different color temperatures in the first group composed of the low color temperature LED white light source and the medium color temperature LED white light source. When the brightness ratio of the low color temperature LED white light source is adjusted to 0, the medium color temperature LED white light source and the high color temperature LED white light source form the two adjacent LED white light sources for continuous adjustment, that is, when the brightness ratio of the low color temperature LED white light source is adjusted to 0, the brightness ratio of the high color temperature LED white light source is turned on.

3. The method for adjusting the light color of the LED lighting lamp according to claim 1, characterized in that The three or more LED white light sources with different color temperatures are three different color temperature LED white light sources, namely a low color temperature LED white light source, a medium color temperature LED white light source, and a high color temperature LED white light source. The control sequence is to first control and adjust the change in the respective brightness ratio of the two adjacent LED white light sources with different color temperatures in the first group composed of the low color temperature LED white light source and the medium color temperature LED white light source. When the brightness ratio of the low color temperature LED white light source is adjusted to 0, the medium color temperature LED white light source and the high color temperature LED white light source form the two adjacent LED white light sources for continuous adjustment, that is, when the brightness ratio of the low color temperature LED white light source is adjusted to 0, the brightness ratio of the high color temperature LED white light source is turned on.

4. A light source using the method for adjusting the light color of the LED lighting lamp according to claim 1, comprising a substrate and a plurality of light-emitting chips of LED white light sources fixedly arranged on the substrate, wherein: The several light-emitting chips are composed of a mixture of light-emitting chips of more than three different color temperatures and are evenly distributed. The light-emitting chips are densely arranged in rows and columns on the substrate. If all the light-emitting chips on a row of light-emitting chips are of the same color temperature, then rows of light-emitting chips of more than three different color temperatures are arranged alternately in the light-emitting area. If all the light-emitting chips on a column of light-emitting chips are of the same color temperature, then columns of light-emitting chips of more than three different color temperatures are arranged alternately in the light-emitting area. In the light-emitting area where rows of light-emitting chips of more than three different color temperatures are arranged alternately, short columns of light-emitting chips of more than three different color temperatures arranged alternately are provided on the upper and lower side regions of the light-emitting area. In the light-emitting area where columns of light-emitting chips of more than three different color temperatures are arranged alternately, short rows of light-emitting chips of more than three different color temperatures arranged alternately are provided on the left and right side regions of the light-emitting area.

5. The light source according to claim 4, characterized in that The light-emitting area is composed of the middle area of the light-emitting area where rows of light-emitting chips of more than three different color temperatures are arranged alternately and the upper and lower side regions of the light-emitting area where short columns of light-emitting chips of more than three different color temperatures are arranged alternately, or is composed of the middle area of the light-emitting area where columns of light-emitting chips of more than three different color temperatures are arranged alternately and the left and right side regions of the light-emitting area where short rows of light-emitting chips of more than three different color temperatures are arranged alternately.

6. The light source according to claim 4 or 5, characterized in that For the upper and lower side regions of the light-emitting area where short columns of light-emitting chips of more than three different color temperatures are arranged alternately, the short columns of light-emitting chips are respectively connected to the rows of light-emitting chips of the same color temperature at their inner ends.

7. The light source according to claim 4 or 5, characterized in that For the left and right side regions of the light-emitting area where short rows of light-emitting chips of more than three different color temperatures are arranged alternately, the short rows of light-emitting chips are respectively connected to the columns of light-emitting chips of the same color temperature at their inner ends.

8. The light source according to claim 4 or 5, characterized in that A reflective layer is coated on the front surface of the substrate.

9. An adjusting device for the light color adjusting method of the LED lighting lamp according to claim 1, 2 or 3, characterized in that: It includes a brightness ratio adjustment circuit, a control circuit, a first drive circuit, a second drive circuit, several groups of LED white light sources with different color temperatures, and several ground switch circuits. The color temperatures of the LED white light sources in the same group are the same. The several groups of LED white light sources with different color temperatures are numbered as the first group of LED white light sources, the second group of LED white light sources, the third group of LED white light sources, the fourth group of LED white light sources... in the order from low color temperature to high color temperature or from high color temperature to low color temperature. The adjustment control signal output terminal of the brightness ratio adjustment circuit is connected to the adjustment control signal input terminal of the control circuit. The first drive control signal output terminal and the second drive control signal output terminal of the control circuit are respectively connected to the drive control signal input terminals of the first drive circuit and the second drive circuit. The power output terminal of the first drive circuit is connected to the positive electrodes of the first group of LED white light sources, the third group of LED white light sources... The power output terminal of the second drive circuit is connected to the positive electrodes of the second group of LED white light sources, the fourth group of LED white light sources... The negative electrode of each group of LED white light sources is connected to an independent ground switch circuit to be grounded. The several switch control signal output terminals of the control circuit are respectively connected to the switch control signal input terminals of each ground switch circuit, and the working sequence of the several ground switch circuits is to first turn on the first and second groups of LED white light sources for mixed light color temperature adjustment. When the brightness of the first group of LED white light sources is adjusted to zero, turn off the first group of LED white light sources and turn on the third group of LED white light sources at the same time to continue the mixed light color temperature adjustment. When the brightness of the second group of LED white light sources is adjusted to zero, turn off the second group of LED white light sources and turn on the fourth group of LED white light sources at the same time to continue the mixed light color temperature adjustment...

10. The adjusting device according to claim 9, characterized in that The first group of LED white light sources, the third group of LED white light sources... are connected in parallel, and the second group of LED white light sources, the fourth group of LED white light sources... are connected in parallel. Each group of LED white light sources is composed of several LED white light sources connected together.

11. The adjusting device according to claim 9, characterized in that When there are only the first, second, and third groups of LED white light sources among the several groups of LED white light sources with different color temperatures, the negative electrode of the second group of LED white light sources is directly grounded without being connected to the ground switch circuit to be grounded.

12. The adjusting device according to claim 9, characterized in that The control circuit is composed of a high-performance and low-power microcontroller integrated circuit with a DSP instruction set of the M483SIDAE type and its corresponding peripheral components connected together.

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