Low color tolerance circuit having CCT adjustable color temperature lamp

Abstract

Disclosed is a low color tolerance circuit having a CCT adjustable color temperature lamp. An adjustable color temperature module comprises: a five CCT toggle switch providing five different color temperature level switches, four fine-tuning resistors, and three light-emitting diodes arranged in descending order of color temperature values. In the present invention, by means of adding an intermediate color temperature light emitting diode between a lowest color temperature light emitting diode and a highest color temperature light emitting diode, and combining four fine-tuning resistors and a five CCT toggle switch, the color tolerance of each level of a CCT adjustable color temperature lamp can be adjusted or limited within a 5 SDCM range required by a customer; the present invention has advantages such as low color tolerance, a simplified circuit, low costs, high accuracy, high reliability, and a wide range of applications.

Description

Low color tolerance circuit of CCT adjustable color temperature lamp TECHNICAL FIELD

[0001] The present application relates to the field of lighting circuit, and particularly relates to a low color tolerance circuit of CCT adjustable color temperature lamp. BACKGROUND

[0002] Currently, for the CCT adjustable color temperature lamp, the industry uniform practice is to use the third color temperature LED lamp bead to match the first color temperature LED lamp bead, and then mix colors to obtain the required mixed color temperature.

[0003] In the process of implementing the low color tolerance circuit of CCT adjustable color temperature lamp, the present application has at least found the following technical problems in the prior art:

[0004] In the existing CCT adjustable color temperature lamp, the color tolerance of the mixed color position is generally about 7SDCM, which is obviously higher than the customer requirement of 5SDCM range. Therefore, adjusting the color tolerance of the mixed color part within the customer requirement of 5SDCM range has become the direction and goal of the industry.

[0005] In summary, the color tolerance of the existing CCT adjustable color temperature lamp cannot meet the actual use requirement.

[0006] SUMMARY

[0007] The embodiment of the present application provides a low color tolerance circuit of CCT adjustable color temperature lamp, which can adjust the color tolerance within the customer requirement of 5SDCM range, and solves the problem that the color tolerance of the existing CCT adjustable color temperature lamp cannot meet the actual use requirement.

[0008] The embodiment of the present application provides a low color tolerance circuit of CCT adjustable color temperature lamp, which comprises an adjustable color temperature module having a common anode input end and a switch common output end, and the adjustable color temperature module comprises:

[0009] A five-CCT toggle switch is electrically connected with the switch common output end, and provides five different color temperature position switches, which are a first color temperature position switch, a second color temperature position switch, a third color temperature position switch, a fourth color temperature position switch and a fifth color temperature position switch.

[0010] A first trimming resistor has a second end electrically connected with a second end of the second color temperature position switch.

[0011] A second trimming resistor has a second end electrically connected with a first end of the second color temperature position switch.

[0012] A third trimming resistor has a second end electrically connected with a first end of the fourth color temperature position switch.

[0013] a fourth fine-tuning resistor, a second end of which is electrically connected with the second end of the fourth color temperature gear switch;

[0014] a first color temperature light emitting diode, an input end of which is electrically connected with the common anode input end, an output end of which is electrically connected with the second end of the second color temperature gear switch through the first fine-tuning resistor, and an output end of which is electrically connected with the first end and the second end of the first color temperature gear switch;

[0015] a second color temperature light emitting diode, an input end of which is electrically connected with the common anode input end, an output end of which is electrically connected with the first end of the second color temperature gear switch through the second fine-tuning resistor, an output end of which is electrically connected with the first end of the third color temperature gear switch, and an output end of which is electrically connected with the first end of the fourth color temperature gear switch through the third fine-tuning resistor;

[0016] a third color temperature light emitting diode, an input end of which is electrically connected with the common anode input end, an output end of which is electrically connected with the first end and the second end of the fifth color temperature gear switch, and an output end of which is electrically connected with the second end of the fourth color temperature gear switch through the fourth fine-tuning resistor;

[0017] wherein the color temperature values of the first color temperature light emitting diode, the second color temperature light emitting diode and the third color temperature light emitting diode are different and arranged in descending order;

[0018] when the five-CCT toggle switch is toggled to the first color temperature gear switch, a first color temperature is obtained;

[0019] when the five-CCT toggle switch is toggled to the second color temperature gear switch, the resistance values of the first fine-tuning resistor and the second fine-tuning resistor are fine-tuned, and a second color temperature is obtained;

[0020] when the five-CCT toggle switch is toggled to the third color temperature gear switch, a third color temperature is obtained;

[0021] when the five-CCT toggle switch is toggled to the fourth color temperature gear switch, the resistance values of the third fine-tuning resistor and the fourth fine-tuning resistor are fine-tuned, and a fourth color temperature is obtained;

[0022] when the five-CCT toggle switch is toggled to the fifth color temperature gear switch, a fifth color temperature is obtained.

[0023] Optionally, the first color temperature light emitting diode is specifically a light emitting diode with a color temperature value of 6500K.

[0024] Optionally, the second color temperature light emitting diode is specifically a light emitting diode with a color temperature value of 4000K.

[0025] Optionally, the third color temperature light emitting diode is specifically a light emitting diode with a color temperature value of 2700K.

[0026] Optionally, the low color tolerance circuit further comprises:

[0027] The first power module is electrically connected with the common output end of the switch, and the adjustable color temperature module is grounded through the first power module.

[0028] The second power module is electrically connected with the common output end of the switch, and the adjustable color temperature module is grounded through the second power module.

[0029] Optionally, the first power module comprises a first power chip, and an eighth pin of the first power chip is electrically connected with the common output end of the switch.

[0030] Optionally, the second power module comprises a second power chip, and an eighth pin of the second power chip is electrically connected with the common output end of the switch.

[0031] Optionally, the low color tolerance circuit further comprises a rectifier module, a first input end and a second input end of the rectifier module are electrically connected with a power supply, a first output end is electrically connected with a common anode input end of the adjustable color temperature module, a first pin of the first power chip, a second pin of the first power chip, a first pin of the second power chip and a second pin of the second power chip, and a second output end is grounded.

[0032] Optionally, the low color tolerance circuit further comprises a circuit adjustment module, a first end of the circuit adjustment module is electrically connected with an output end of the rectifier module, a first pin of the first power chip, a second pin of the first power chip, a first pin of the second power chip and a second pin of the second power chip, and a second end is electrically connected with the common anode input end of the adjustable color temperature module.

[0033] Optionally, the low color tolerance circuit further comprises a filter module, a first end is electrically connected with a second end of the circuit adjustment module and the common anode input end of the adjustable color temperature module, and a second end is electrically connected with an eighth pin of the first power module, a second pin of the second power module and the common output end of the switch of the adjustable color temperature module.

[0034] The one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0035] The low color tolerance circuit with CCT adjustable color temperature lamps provided by the application comprises a first color temperature light emitting diode, a second color temperature light emitting diode and a third color temperature light emitting diode, among the three light emitting diodes, the color temperature value of the first color temperature light emitting diode is the highest, the color temperature value of the second color temperature light emitting diode is the second, and the color temperature value of the third color temperature light emitting diode is the lowest. By adding the intermediate color temperature light emitting diode between the lowest color temperature light emitting diode and the highest color temperature light emitting diode, and combining four fine tuning resistors and five CCT toggle switches, the color tolerance of each gear of the CCT adjustable color temperature lamps can be adjusted or limited within the range of 5 SDCM required by the customer, and the low color tolerance circuit has the advantages of low color tolerance, simple circuit, low cost, high accuracy, high reliability, wide applicable range and the like. BRIEF DESCRIPTION OF DRAWINGS

[0036] Fig. 1 is an electrical schematic diagram of a low color tolerance circuit with CCT adjustable color temperature lamps in an embodiment of the application;

[0037] Fig. 2 is an electrical schematic diagram of an adjustable color temperature module in an embodiment of the application;

[0038] Fig. 3 is an electrical schematic diagram of a first power module in an embodiment of the application;

[0039] Fig. 4 is an electrical schematic diagram of a second power module in an embodiment of the application;

[0040] Fig. 5 is an electrical schematic diagram of a rectification module in an embodiment of the application;

[0041] Fig. 6 is an electrical schematic diagram of a circuit adjustment module in an embodiment of the application;

[0042] Fig. 7 is an electrical schematic diagram of a filtering module in an embodiment of the application;

[0043] In the drawings:

[0044] F1, safety resistor;

[0045] RV1, pressure sensitive resistor;

[0046] BD1, rectifier bridge;

[0047] CBB1, metalized polypropylene film capacitor;

[0048] R1, first resistor;

[0049] R2, second resistor;

[0050] R3, third resistor;

[0051] R4, fourth resistor;

[0052] R5, fifth resistor;

[0053] C1, first capacitor;

[0054] C2, second capacitor;

[0055] D1, diode;

[0056] R6, sixth resistor;

[0057] R7, seventh resistor;

[0058] R8, eighth resistor;

[0059] R9, ninth resistor;

[0060] U1, first power chip;

[0061] EC1, first electrolytic capacitor;

[0062] EC2, second electrolytic capacitor;

[0063] R12, twelfth resistor;

[0064] R13, thirteenth resistor

[0065] R14, fourteenth resistor;

[0066] R15, fifteenth resistor;

[0067] R16, sixteenth resistor;

[0068] C3, third capacitor;

[0069] R17, seventeenth resistor;

[0070] R18, eighteenth resistor;

[0071] R19, nineteenth resistor;

[0072] R20, twentieth resistor;

[0073] R21, twenty-first resistor;

[0074] C4, fourth capacitor;

[0075] C5, fifth capacitor;

[0076] U2, second power chip;

[0077] R22, twenty-second resistor;

[0078] R23, twenty-third resistor;

[0079] R24, twenty-fourth resistor;

[0080] C6, sixth capacitor;

[0081] S1, five CCT toggle switch;

[0082] R65, first trimmer resistor;

[0083] R50, second trimmer resistor;

[0084] R30, third trimmer resistor;

[0085] R27, fourth trimmer resistor;

[0086] D2, first color temperature light emitting diode;

[0087] D3, second color temperature light emitting diode;

[0088] D4, third color temperature light emitting diode. DETAILED DESCRIPTION

[0089] The embodiment of the application provides a low color tolerance circuit of a CCT adjustable color temperature lamp, which can adjust the color tolerance to the range of 5SDCM required by customers, and solves the problem that the color tolerance of the existing CCT adjustable color temperature lamp cannot meet the actual use requirement.

[0090] Firstly, the terms appearing in the specification will be explained respectively.

[0091] 1, color temperature

[0092] Color temperature is a measure of the color content of light, usually measured in Kelvin (K). It is defined based on the principle that a hypothetical black object emits different colors of light when heated to different temperatures.

[0093] Color temperature is used to describe the "warmth" or "coolness" of a light source. Lower color temperatures (such as 2700K-3000K) present warm tones, such as red, orange and yellow, and are often used to create a warm and comfortable atmosphere; higher color temperatures (such as 5000K-6500K) present cool tones, such as white and blue, and are suitable for places that require bright and clear lighting.

[0094] When choosing lighting products, choose the appropriate color temperature according to the use scene and the atmosphere to be created. For example, low color temperature light is often chosen for living rooms and bedrooms, while high color temperature light is more suitable for offices and libraries.

[0095] 2, color tolerance

[0096] Color tolerance refers to the difference between the spectrum emitted by the light source and the standard spectrum, and is an index representing the difference between the X, Y values calculated by the light color detection system software and the standard light source. Its unit is SDCM (Standard Deviation of Color Matching).

[0097] Color tolerance reflects the accuracy and consistency of the color of the light source. The smaller the value, the closer the color of the light source to the standard value, the higher the accuracy, and the more pure the color of the light. In lighting applications, color tolerance directly affects the overall consistency and aesthetics of the lighting effect.

[0098] Different countries and regions have different standard requirements for color tolerance. For example, the national standard GB 10682-2002 stipulates that the color tolerance of general energy-saving lamps should be less than 5 SDCM; GB 24823-2009 stipulates that the color tolerance of LED modules for general lighting should be less than 7 SDCM.

[0099] Color tolerance is affected by many factors, including the manufacturing process and quality of LED chips, the design and process of LED driving circuit, the combination and arrangement of LED beads, etc. In addition, the heat dissipation performance of the light source, the stability of the driving current, etc. will also affect the color tolerance.

[0100] 3、CCT lamp

[0101] CCT (Correlated Color Temperature) lamp refers to a lighting device that can emit light with a specific color temperature. For electrically excited light sources such as LEDs and high-intensity gas discharge light sources, their spectral characteristics may not completely conform to the characteristics of blackbody radiation. Therefore, the concept of correlated color temperature is introduced, that is, when the color point of a light source is not on the blackbody locus, but is closest to the color point of a blackbody at a certain temperature, the color temperature of the light source is called correlated color temperature.

[0102] The range of CCT is usually from about 2700K (warm color) to about 6500K (cool color). Among them, the color temperature between 2700K and 3000K is considered to be a more comfortable and natural color temperature.

[0103] In commercial applications, white light LED manufacturers usually divide the output of white light LEDs into "warm white" (2600 to 3700K CCT), "neutral white" (3700 to 5000K CCT), and "cool white" (5000 to 8300K CCT) categories to meet the needs of different markets and consumers.

[0104] In order to better understand the low color tolerance circuit of the CCT adjustable color temperature lamp provided by the present application, the low color tolerance circuit will be described in detail below in combination with the drawings in the specification and specific embodiments. Obviously, the embodiments described in the present application are part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0105] Please refer to FIG. 1 and FIG. 2, the present application provides a low color tolerance circuit with CCT adjustable color temperature lamps, including rectifier module, circuit adjustment module, filter module, first power module, second power module, adjustable color temperature module. The adjustable color temperature module can adjust or limit the color tolerance of each gear of the CCT adjustable color temperature lamps within the range of 5SDCM required by the customer. Below, each component module will be introduced one by one.

[0106] (I) adjustable color temperature module

[0107] Please refer to FIG. 1 and FIG. 2, the adjustable color temperature module has a common anode input end and a switch common output end. The adjustable color temperature module includes: a five-CCT toggle switch S1, four trim resistors, and three color temperature value LEDs arranged in descending order from high to low.

[0108] Among them, the five-CCT toggle switch S1 provides five different color temperature gear switches, which are first color temperature gear switch, second color temperature gear switch, third color temperature gear switch, fourth color temperature gear switch and fifth color temperature gear switch. Specifically, the five-CCT toggle switch S1 stays at five different positions by toggling the switch handle, thereby controlling or selecting different color temperature values of the low color tolerance circuit. For example: when the switch handle stays at the position of the first contact and the twelfth contact, the five-CCT toggle switch S1 switches to the first color temperature gear switch; when the switch handle stays at the position of the second contact and the eleventh contact, the five-CCT toggle switch S1 switches to the second color temperature gear switch; when the switch handle stays at the position of the fourth contact and the ninth contact, the five-CCT toggle switch S1 switches to the third color temperature gear switch; when the switch handle stays at the position of the fifth contact and the eighth contact, the five-CCT toggle switch S1 switches to the fourth color temperature gear switch; when the switch handle stays at the position of the sixth contact and the seventh contact, the five-CCT toggle switch S1 switches to the fifth color temperature gear switch. The third contact and the tenth contact of the five-CCT toggle switch S1 are the common output end, the first contact, the second contact, the fourth contact, the fifth contact, the sixth contact are electrically connected with the third contact, the seventh contact, the eighth contact, the eleventh contact, the twelfth contact are electrically connected with the tenth contact. The first contact is electrically connected with the twelfth contact, and the sixth contact is electrically connected with the seventh contact.

[0109] The four trimming resistors are respectively a first trimming resistor R65, a second trimming resistor R50, a third trimming resistor R30 and a fourth trimming resistor R27. The first trimming resistor R65 has a first end electrically connected to an output end of the first color temperature light emitting diode D2 and a second end electrically connected to a second end (i.e. an eleventh contact point) of the second color temperature gear switch. The second trimming resistor R50 has a first end electrically connected to an output end of the second color temperature light emitting diode D3 and a second end electrically connected to a first end (i.e. a second contact point) of the second color temperature gear switch. The third trimming resistor R30 has a first end electrically connected to an output end of the second color temperature light emitting diode D3 and a second end electrically connected to a first end (i.e. a fifth contact point) of the fourth color temperature gear switch. The fourth trimming resistor R27 has a first end electrically connected to an output end of the third color temperature light emitting diode D4 and a second end electrically connected to a second end (i.e. an eighth contact point) of the fourth color temperature gear switch.

[0110] The three color temperature light emitting diodes arranged in descending order from high to low are respectively the first color temperature light emitting diode D2, the second color temperature light emitting diode D3 and the third color temperature light emitting diode D4. Preferably, the first color temperature light emitting diode D2 is specifically a 6500K light emitting diode, the second color temperature light emitting diode D3 is specifically a 4000K light emitting diode, and the third color temperature light emitting diode D4 is specifically a 2700K light emitting diode. Of course, in specific applications, other color temperature light emitting diodes can be selected as the first color temperature light emitting diode D2, the second color temperature light emitting diode D3 and the third color temperature light emitting diode D4 according to actual needs, and the present application is not limited thereto.

[0111] The first color temperature light emitting diode D2 has an input end electrically connected to the common anode input end, an output end electrically connected to the second end (i.e. an eleventh contact point) of the second color temperature gear switch through the first trimming resistor R65, and an output end electrically connected to the first end (i.e. a first contact point) and the second end (i.e. a twelfth contact point) of the first color temperature gear switch. The second color temperature light emitting diode D3 has an input end electrically connected to the common anode input end, an output end electrically connected to the first end (i.e. a second contact point) of the second color temperature gear switch through the second trimming resistor R50, an output end electrically connected to the first end (i.e. a fourth contact point) of the third color temperature gear switch, and an output end electrically connected to the first end (i.e. a fifth contact point) of the fourth color temperature gear switch through the third trimming resistor R30. The third color temperature light emitting diode D4 has an input end electrically connected to the common anode input end, an output end electrically connected to the first end (i.e. a sixth contact point) and the second end (i.e. a seventh contact point) of the fifth color temperature gear switch, and an output end electrically connected to the second end (i.e. an eighth contact point) of the fourth color temperature gear switch through the fourth trimming resistor R27.

[0112] Working condition of the adjustable color temperature module:

[0113] When the five-CCT toggle switch S1 is toggled to the first color temperature position switch, a first color temperature is obtained;

[0114] When the five-CCT toggle switch S1 is toggled to the second color temperature position switch, the resistance values of the first fine-tuning resistor R65 and the second fine-tuning resistor R50 are fine-tuned, and a second color temperature is obtained;

[0115] When the five-CCT toggle switch S1 is toggled to the third color temperature position switch, a third color temperature is obtained;

[0116] When the five-CCT toggle switch S1 is toggled to the fourth color temperature position switch, the resistance values of the third fine-tuning resistor R30 and the fourth fine-tuning resistor R27 are fine-tuned, and a fourth color temperature is obtained;

[0117] When the five-CCT toggle switch S1 is toggled to the fifth color temperature position switch, a fifth color temperature is obtained.

[0118] For example, when the color temperature value of the first color temperature light-emitting diode D2 is 6500K, the color temperature value of the second color temperature light-emitting diode D3 is 4000K, and the color temperature value of the third color temperature light-emitting diode D4 is 2700K, the five color temperatures obtained are 6500K, 5000K, 4000K, 3000K, and 2700K. Among them, 5000K is the mixed color of the two color temperatures of 6500K and 4000K, and 3000K is the mixed color of the two color temperatures of 4000K and 2700K.

[0119] (II) First power module

[0120] Please refer to FIG. 1 and FIG. 3 at the same time, the first power module is electrically connected with the common output end of the switch, and the color temperature adjustable module is grounded through the first power module.

[0121] The first power module comprises a first power chip U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, and a third capacitor C3. The first pin of the first power chip U1 is connected with the fourth resistor R4 and the fifth resistor R5 in series, the second pin of the first power chip U1 is connected with the first resistor R1 and the second resistor R2 in series, the second pin of the first power chip U1 is grounded through the third resistor R3, the second pin of the first power chip U1 is grounded through the first capacitor C1, the third pin of the first power chip U1 is grounded through the second capacitor C2, the fourth pin of the first power chip U1 is grounded, the fifth pin of the first power chip U1 is grounded, the sixth pin of the first power chip U1 is electrically connected with the seventh pin of the first power chip U1 through the twelfth resistor R12, the seventh pin of the first power chip U1 is grounded through the thirteenth resistor R13, the seventh pin of the first power chip U1 is grounded through the fourteenth resistor R14, and the eighth pin of the first power chip U1 is electrically connected with the common output end of the switch of the adjustable color temperature module, and the eighth pin of the first power chip U1 is grounded through the third capacitor C3.

[0122] (Three) second power module

[0123] Please refer to FIG. 1 and FIG. 4, the second power module comprises a second power chip U2, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a fourth capacitor C4, a fifth capacitor C5, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, and a sixth capacitor C6. The first pin of the second power chip U2 is connected with the twentieth resistor R20 and the twenty-first resistor R21 in series, the second pin of the second power chip U2 is connected with the seventeenth resistor R17 and the eighteenth resistor R18 in series, the second pin of the second power chip U2 is grounded through the nineteenth resistor R19, the second pin of the second power chip U2 is grounded through the fourth capacitor C4, the third pin of the second power chip U2 is grounded through the fifth capacitor C5, the fourth pin of the second power chip U2 is grounded, the fifth pin of the second power chip U2 is grounded, the sixth pin of the second power chip U2 is electrically connected with the seventh pin of the second power chip U2 through the twenty-second resistor R22, the seventh pin of the second power chip U2 is grounded through the twenty-third resistor R23, the seventh pin of the second power chip U2 is grounded through the twenty-fourth resistor R24, and the eighth pin of the second power chip U2 is electrically connected with the common output end of the switch of the adjustable color temperature module, and the eighth pin of the second power chip U2 is grounded through the sixth capacitor C6.

[0124] (Five) rectifier module

[0125] Please refer to Fig. 1 and Fig. 5, the first input end and the second input end of the rectifier module are electrically connected with the power supply. The first output end of the rectifier module is electrically connected with the common anode input end of the adjustable color temperature module, the first pin of the first power chip, the second pin of the first power chip, the first pin of the second power chip, and the second pin of the second power chip, and the second output end is grounded. The second output end of the rectifier module is grounded.

[0126] The rectifier module includes a rectifier bridge BD1, a fuse resistor F1, a pressure sensitive resistor RV1, and a metallized polypropylene film capacitor CBB1. The pressure sensitive resistor RV1 is connected in parallel with the first AC pin and the second AC pin of the rectifier bridge BD1. The fuse resistor F1 is electrically connected with the first AC pin of the rectifier bridge BD1. The metallized polypropylene film capacitor CBB1 is connected in parallel with the positive pin and the negative pin of the rectifier bridge BD1.

[0127] (Six) Circuit regulation module

[0128] Please refer to Fig. 1 and Fig. 6, one end of the circuit regulation module is electrically connected with the output end of the rectifier module, the first pin of the first power chip, the second pin of the first power chip, the first pin of the second power chip, and the second pin of the second power chip. The second end of the circuit regulation module is electrically connected with the common anode input end of the adjustable color temperature module.

[0129] The circuit regulation module includes a diode D1, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9. The sixth resistor R6, the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9 are connected in parallel to form a parallel circuit. The diode D1 is electrically connected with the input end of the parallel circuit.

[0130] (Seven) Filter module

[0131] Please refer to Fig. 1 and Fig. 7, the first end of the filter module is electrically connected with the second end of the circuit regulation module and the common anode input end of the adjustable color temperature module. The second end of the filter module is electrically connected with the eighth pin of the first power module, the eighth pin of the second power module, and the switch common output end of the adjustable color temperature module.

[0132] The filter module includes a first electrolytic capacitor EC1, a second electrolytic capacitor EC2, a fifteenth resistor R15, and a sixteenth resistor R16. The first electrolytic capacitor EC1 and the second electrolytic capacitor EC2 are connected in parallel. The fifteenth resistor R15 and the sixteenth resistor R16 are connected in series and then connected in parallel with the first electrolytic capacitor EC1 and the second electrolytic capacitor EC2.

[0133] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A low color tolerance circuit for a CCT tunable color temperature luminaire, comprising: The adjustable color temperature module comprises a common anode input end and a switch common output end, and the adjustable color temperature module comprises: A five-CCT toggle switch is electrically connected with the switch common output end to provide five different color temperature position switches, namely a first color temperature position switch, a second color temperature position switch, a third color temperature position switch, a fourth color temperature position switch and a fifth color temperature position switch. A first trimming resistor has a second end electrically connected with a second end of the second color temperature position switch. A second trimming resistor has a second end electrically connected with a first end of the second color temperature position switch. A third trimming resistor has a second end electrically connected with a first end of the fourth color temperature position switch. A fourth trimming resistor has a second end electrically connected with a second end of the fourth color temperature position switch. A first color temperature light-emitting diode has an input end electrically connected with the common anode input end, an output end electrically connected with the second end of the second color temperature position switch through the first trimming resistor, and an output end electrically connected with the first end and the second end of the first color temperature position switch. A second color temperature light-emitting diode has an input end electrically connected with the common anode input end, an output end electrically connected with the first end of the second color temperature position switch through the second trimming resistor, and an output end electrically connected with the first end of the third color temperature position switch. A third color temperature light-emitting diode has an input end electrically connected with the common anode input end, an output end electrically connected with the first end and the second end of the fifth color temperature position switch, and an output end electrically connected with the second end of the fourth color temperature position switch through the fourth trimming resistor. The color temperature values of the first color temperature light-emitting diode, the second color temperature light-emitting diode and the third color temperature light-emitting diode are different and arranged in descending order. When the five-CCT toggle switch is toggled to the first color temperature position switch, a first color temperature is obtained. When the five-CCT toggle switch is toggled to the second color temperature position switch, the resistance values of the first trimming resistor and the second trimming resistor are trimmed to obtain a second color temperature. When the five-CCT toggle switch is toggled to the third color temperature position switch, a third color temperature is obtained. When the five-CCT toggle switch is toggled to the fourth color temperature position switch, the resistance values of the third trimming resistor and the fourth trimming resistor are trimmed to obtain a fourth color temperature. When the five-CCT toggle switch is toggled to the fifth color temperature position switch, a fifth color temperature is obtained.

2. The low color tolerance circuit of claim 1, wherein, The first color temperature light-emitting diode is specifically a light-emitting diode with a color temperature value of 6500K.

3. The low color tolerance circuit of claim 1, wherein, The second color temperature light-emitting diode is specifically a light-emitting diode with a color temperature value of 4000K.

4. The low color tolerance circuit of claim 1, wherein, The third color temperature light-emitting diode is specifically a light-emitting diode with a color temperature value of 2700K.

5. The low color tolerance circuit of claim 1, wherein, The low color tolerance circuit further comprises: A first power module is electrically connected with the switch common output end, and the adjustable color temperature module is grounded through the first power module. A second power module is electrically connected with the switch common output end, and the adjustable color temperature module is grounded through the second power module.

6. The low color tolerance circuit of claim 5, wherein, The first power module comprises a first power chip, and an eighth pin of the first power chip is electrically connected with the common output end of the switch.

7. The low color tolerance circuit of claim 6, wherein, The second power module comprises a second power chip, and an eighth pin of the second power chip is electrically connected with the common output end of the switch.

8. The low color tolerance circuit of claim 7, wherein, The low color tolerance circuit further comprises a rectifier module, first and second input ends of the rectifier module are electrically connected with a power supply, a first output end of the rectifier module is electrically connected with a common anode input end of the adjustable color temperature module, a first pin of the first power chip, a second pin of the first power chip, a first pin of the second power chip and a second pin of the second power chip, and a second output end of the rectifier module is grounded.

9. The low color tolerance circuit of claim 8, wherein, The low color tolerance circuit further comprises a circuit adjustment module, a first end of the circuit adjustment module is electrically connected with an output end of the rectifier module, a first pin of the first power chip, a second pin of the first power chip, a first pin of the second power chip and a second pin of the second power chip, and a second end of the circuit adjustment module is electrically connected with the common anode input end of the adjustable color temperature module.

10. The low color tolerance circuit of claim 9, wherein, The low color tolerance circuit further comprises a filter module, a first end of the filter module is electrically connected with the second end of the circuit adjustment module and the common anode input end of the adjustable color temperature module, and a second end of the filter module is electrically connected with the eighth pin of the first power module, the second pin of the second power module and the common output end of the switch of the adjustable color temperature module.

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