Low color tolerance circuit with CCT color temperature adjustable lamp

Abstract

The utility model discloses a low color tolerance circuit with a CCT color temperature adjustable lamp. An adjustable color temperature module of the low color tolerance circuit comprises five CCT toggle switches for providing five different color temperature gear switches, four trimming resistors and three light-emitting diodes, wherein color temperature values of the three light-emitting diodes are arranged in a descending order from high to low. According to the utility model, the middle color temperature light emitting diode is additionally arranged between the lowest color temperature light emitting diode and the highest color temperature light emitting diode, and the four trimming resistors and the five CCT toggle switches are combined, so that the color tolerance of each gear of the CCT color temperature adjustable lamp can be adjusted or limited within a 5SDCM range required by customers; the circuit has the advantages of low color tolerance, simple circuit, low cost, high accuracy, high reliability, wide application range and the like.

Description

Technical Field

[0001] The utility model relates to the field of lighting circuits, in particular to a low color tolerance circuit for a CCT adjustable color temperature lamp. Background Art

[0002] Currently, for CCT adjustable color temperature lamps, the industry's common practice is to use third color temperature LED lamp beads in combination with first color temperature LED lamp beads, and then mix the colors to obtain various intermediate mixed color temperatures as required.

[0003] During the process of implementing a low color tolerance circuit for a CCT adjustable color temperature lamp in an embodiment of the present utility model, the inventors of this patent at least found the following technical problems in the prior art:

[0004] In existing CCT adjustable color temperature lamps, the color tolerance of the color mixing gear is generally about 7SDCM, which significantly exceeds the customer's requirement of 5SDCM range. Therefore, adjusting the color tolerance of the color mixing part within the customer's requirement of 5SDCM has become the direction and goal of the industry's efforts!

[0005] In summary, the color tolerance of existing CCT adjustable color temperature lamps cannot meet the actual use requirements. Summary of the Utility Model

[0006] An embodiment of the present utility model provides a low color tolerance circuit for a CCT adjustable color temperature lamp, which can adjust the color tolerance within the customer's requirement of 5SDCM, and solves the problem that the color tolerance of existing CCT adjustable color temperature lamps cannot meet the actual use requirements.

[0007] An embodiment of the present utility model provides a low color tolerance circuit for a CCT adjustable color temperature lamp, including an adjustable color temperature module having a common anode input terminal and a switch common output terminal, and the adjustable color temperature module includes:

[0008] A five-CCT toggle switch, electrically connected to the switch common output terminal, providing five different color temperature gear switches, namely a first color temperature gear switch, a second color temperature gear switch, a third color temperature gear switch, a fourth color temperature gear switch, and a fifth color temperature gear switch;

[0009] A first trimming resistor, whose second terminal is electrically connected to the second terminal of the second color temperature gear switch;

[0010] A second trimming resistor, whose second terminal is electrically connected to the first terminal of the second color temperature gear switch;

[0011] A third trimming resistor, whose second terminal is electrically connected to the first terminal of the fourth color temperature gear switch;

[0012] The fourth trimming resistor, whose second terminal is electrically connected to the second terminal of the fourth color temperature range switch;

[0013] The first color temperature light-emitting diode, whose input terminal is electrically connected to the common anode input terminal, whose output terminal is electrically connected to the second terminal of the second color temperature range switch through the first trimming resistor, and whose output terminal is electrically connected to the first terminal and the second terminal of the first color temperature range switch;

[0014] The second color temperature light-emitting diode, whose input terminal is electrically connected to the common anode input terminal, whose output terminal is electrically connected to the first terminal of the second color temperature range switch through the second trimming resistor, whose output terminal is electrically connected to the first terminal of the third color temperature range switch, and whose output terminal is electrically connected to the first terminal of the fourth color temperature range switch through the third trimming resistor;

[0015] The third color temperature light-emitting diode, whose input terminal is electrically connected to the common anode input terminal, whose output terminal is electrically connected to the first terminal and the second terminal of the fifth color temperature range switch, and whose output terminal is electrically connected to the second terminal of the fourth color temperature range switch through the fourth trimming resistor;

[0016] 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 from each other and are arranged in descending order;

[0017] When the five-CCT toggle switch is toggled to the first color temperature range switch, the first color temperature is obtained;

[0018] When the five-CCT toggle switch is toggled to the second color temperature range switch, the resistance values of the first trimming resistor and the second trimming resistor are finely adjusted to obtain the second color temperature;

[0019] When the five-CCT toggle switch is toggled to the third color temperature range switch, the third color temperature is obtained;

[0020] When the five-CCT toggle switch is toggled to the fourth color temperature range switch, the resistance values of the third trimming resistor and the fourth trimming resistor are finely adjusted to obtain the fourth color temperature;

[0021] When the five-CCT toggle switch is toggled to the fifth color temperature range switch, the fifth color temperature is obtained.

[0022] Optionally, the first color temperature light-emitting diode is specifically a light-emitting diode with a color temperature value of 6500K.

[0023] Optionally, the second color temperature light-emitting diode is specifically a light-emitting diode with a color temperature value of 4000K.

[0024] Optionally, the third color temperature light-emitting diode is specifically a light-emitting diode with a color temperature value of 2700K.

[0025] Optionally, the low color tolerance circuit further includes:

[0026] A first power module, electrically connected to the switch common output terminal, and the adjustable color temperature module is grounded through the first power module;

[0027] A second power module, electrically connected to the switch common output terminal, and the adjustable color temperature module is grounded through the second power module.

[0028] Optionally, the first power module includes a first power chip, and its eighth pin is electrically connected to the switch common output terminal.

[0029] Optionally, the second power module includes a second power chip, and its eighth pin is electrically connected to the switch common output terminal.

[0030] Optionally, the low color tolerance circuit further includes a rectification module, whose first input terminal and second input terminal are both electrically connected to the power supply, the first output terminal is electrically connected to the common anode input terminal 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 terminal is grounded.

[0031] Optionally, the low color tolerance circuit further includes a circuit adjustment module, whose first end is electrically connected to the output terminal of the rectification 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 its second end is connected to the common anode input terminal of the adjustable color temperature module.

[0032] Optionally, the low color tolerance circuit further includes a filtering module, the first end is electrically connected to the second end of the circuit adjustment module and the common anode input terminal of the adjustable color temperature module, and the second end is electrically connected to the eighth pin of the first power module, the second pin of the second power module, and the switch common output terminal of the adjustable color temperature module.

[0033] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0034] A low color tolerance circuit for a CCT adjustable color temperature lamp provided by the present utility model includes 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 first color temperature light emitting diode has the highest color temperature value, the second color temperature light emitting diode has the second highest color temperature value, and the third color temperature light emitting diode has the lowest color temperature value. By adding an 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 trimming resistors and a five-CCT toggle switch, the color tolerance of each gear of the CCT adjustable color temperature lamp can be adjusted or limited within the 5SDCM range required by the customer, having the advantages of low color tolerance, simple circuit, low cost, high accuracy, high reliability, and wide applicable range. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 FIG. is the electrical schematic diagram of a low color tolerance circuit for a CCT adjustable color temperature lamp in an embodiment of the present utility model;

[0036] Figure 2 FIG. is the electrical schematic diagram of an adjustable color temperature module in an embodiment of the present utility model;

[0037] Figure 3 FIG. is the electrical schematic diagram of a first power module in an embodiment of the present utility model;

[0038] Figure 4 FIG. is the electrical schematic diagram of a second power module in an embodiment of the present utility model;

[0039] Figure 5 FIG. is the electrical schematic diagram of a rectification module in an embodiment of the present utility model;

[0040] Figure 6 FIG. is the electrical schematic diagram of a circuit adjustment module in an embodiment of the present utility model;

[0041] Figure 7 FIG. is the electrical schematic diagram of a filtering module in an embodiment of the present utility model;

[0042] In the figure:

[0043] F1, fuse resistor;

[0044] RV1, varistor;

[0045] BD1, rectifier bridge;

[0046] CBB1, metallized polypropylene film capacitor;

[0047] R1, first resistor;

[0048] R2, second resistor;

[0049] R3, third resistor;

[0050] R4, the fourth resistor;

[0051] R5, the fifth resistor;

[0052] C1, the first capacitor;

[0053] C2, the second capacitor;

[0054] D1, the diode;

[0055] R6, the sixth resistor;

[0056] R7, the seventh resistor;

[0057] R8, the eighth resistor;

[0058] R9, the ninth resistor;

[0059] U1, the first power chip;

[0060] EC1, the first electrolytic capacitor;

[0061] EC2, the second electrolytic capacitor;

[0062] R12, the twelfth resistor;

[0063] R13, the thirteenth resistor

[0064] R14, the fourteenth resistor;

[0065] R15, the fifteenth resistor;

[0066] R16, the sixteenth resistor;

[0067] C3, the third capacitor;

[0068] R17, the seventeenth resistor;

[0069] R18, the eighteenth resistor;

[0070] R19, the nineteenth resistor;

[0071] R20, the twentieth resistor;

[0072] R21, the twenty - first resistor;

[0073] C4, the fourth capacitor;

[0074] C5, the fifth capacitor;

[0075] U2, the second power chip;

[0076] R22, the twenty - second resistor;

[0077] R23, the twenty - third resistor;

[0078] R24, the twenty-fourth resistor;

[0079] C6, the sixth capacitor;

[0080] S1, five-CCT toggle switch;

[0081] R65, the first trimming resistor;

[0082] R50, the second trimming resistor;

[0083] R30, the third trimming resistor;

[0084] R27, the fourth trimming resistor;

[0085] D2, the first color temperature light-emitting diode;

[0086] D3, the second color temperature light-emitting diode;

[0087] D4, the third color temperature light-emitting diode. Detailed implementation manners

[0088] An embodiment of the present utility model provides a low color tolerance circuit for a CCT adjustable color temperature lamp, which can adjust the color tolerance to within 5 SDCM required by customers, and solves the problem that the color tolerance of existing CCT adjustable color temperature lamps cannot meet the actual use requirements.

[0089] First, the terms appearing in the specification will be explained respectively.

[0090] 1. Color temperature

[0091] Color temperature is a measurement unit indicating the color components contained in light, usually measured in K (Kelvin). It is defined based on the principle that a fictional black object emits different colors of light when heated to different temperatures.

[0092] Color temperature is used to describe the "warmth" or "coolness" feeling of a light source. Lower color temperatures (such as 2700K - 3000K) present warm colors, 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 colors, such as white and blue, and are suitable for places that require bright and clear lighting.

[0093] When selecting lighting products, choose the appropriate color temperature according to the usage scenario and the atmosphere to be created. For example, low color temperature lights are often selected for the living room and bedroom at home, while high color temperature lights are more preferred for offices and libraries.

[0094] 2. Color tolerance

[0095] Color tolerance refers to the difference between the spectrum emitted by a light source and the standard spectrum, and is an indicator characterizing the difference between the X and Y values calculated by the software of the optical color and electricity detection system and the standard light source. Its unit is SDCM (Standard Deviation of Color Matching).

[0096] Color tolerance reflects the accuracy and consistency of the color of a light source. The smaller the value, the closer the color of the light source is to the standard value, the higher the accuracy, and the purer the color of the light. In lighting applications, color tolerance directly affects the overall consistency and aesthetics of the lighting effect.

[0097] Different countries and regions have different standard requirements for color tolerance. For example, the national standard GB10682-2002 stipulates that the color tolerance of general energy-saving lamps should be less than 5 SDCM; GB24823-2009 stipulates that the color tolerance of LED modules for general lighting should be less than 7 SDCM.

[0098] Color tolerance is affected by various factors, including the manufacturing process and quality of LED chips, the design and process of LED drive circuits, the combination and arrangement of LED lamp beads, etc. In addition, the heat dissipation performance of the light source, the stability of the drive current, etc. will also affect color tolerance.

[0099] 3. CCT lamps

[0100] CCT (Correlated Color Temperature) lamps refer to lighting devices that can emit light with a specific color temperature. For electro-luminescent light sources such as LEDs and high-intensity gas discharge light sources, their spectral characteristics may not fully conform to the characteristics of blackbody radiation. Therefore, the concept of correlated color temperature is introduced, that is, when the chromaticity point of the light source is not on the blackbody locus but is closest to the chromaticity of a blackbody at a certain temperature, the color temperature of the light source is called the correlated color temperature.

[0101] The range of CCT usually ranges from about 2700K (warm color tone) to about 6500K (cold color tone). Among them, the color temperature between 2700K and 3000K is considered to be a relatively comfortable and natural color temperature.

[0102] In commercial applications, white LED manufacturers usually classify the output of white LEDs into categories such as "warm white" (2600 to 3700 K CCT), "neutral white" (3700 to 5000 K CCT), and "cold white" (5000 to 8300 K CCT) to meet the needs of different markets and consumers.

[0103] In order to better understand a low color tolerance circuit of a CCT adjustable color temperature lamp provided by the present utility model, the above-mentioned low color tolerance circuit will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments. Obviously, the described embodiments of the present utility model are part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0104] Please refer to Figure 1 and Figure 2 , a low color tolerance circuit of a CCT adjustable color temperature lamp provided by the present utility model includes a rectification module, a circuit adjustment module, a filtering module, a first power module, a second power module, and an 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 lamp within the 5 SDCM range required by the customer. Next, each component module will be introduced one by one.

[0105] (1) Adjustable color temperature module

[0106] Please refer to both Figure 1 and Figure 2 , the adjustable color temperature module has a common anode input terminal and a switch common output terminal. The adjustable color temperature module includes: a five-CCT toggle switch S1, four trimming resistors, and three light-emitting diodes arranged in descending order of color temperature values from high to low.

[0107] Among them, the five-CCT toggle switch S1 provides five different color temperature range switches, namely the first color temperature range switch, the second color temperature range switch, the third color temperature range switch, the fourth color temperature range switch, and the fifth color temperature range switch. Specifically, the five-CCT toggle switch S1 controls or selects different color temperature values of the low color tolerance circuit by staying at five different positions through the toggle switch handle. For example: when the switch handle stays at the positions of the first contact and the twelfth contact, the five-CCT toggle switch S1 switches to the first color temperature range switch; when the switch handle stays at the positions of the second contact and the eleventh contact, the five-CCT toggle switch S1 switches to the second color temperature range switch; when the switch handle stays at the positions of the fourth contact and the ninth contact, the five-CCT toggle switch S1 switches to the third color temperature range switch; when the switch handle stays at the positions of the fifth contact and the eighth contact, the five-CCT toggle switch S1 switches to the fourth color temperature range switch; when the switch handle stays at the positions of the sixth contact and the seventh contact, the five-CCT toggle switch S1 switches to the fifth color temperature range switch. The third contact and the tenth contact of the five-CCT toggle switch S1 are common output terminals. The first contact, the second contact, the fourth contact, the fifth contact, and the sixth contact are all electrically connected to the third contact. The seventh contact, the eighth contact, the eleventh contact, and the twelfth contact are all electrically connected to the tenth contact. The first contact is electrically connected to the twelfth contact, and the sixth contact is electrically connected to the seventh contact.

[0108] Four trimming resistors, namely the first trimming resistor R65, the second trimming resistor R50, the third trimming resistor R30, and the fourth trimming resistor R27. For the first trimming resistor R65, its first end is electrically connected to the output terminal of the first color temperature light-emitting diode D2, and its second end is electrically connected to the second end (i.e., the eleventh contact) of the second color temperature range switch; for the second trimming resistor R50, its first end is electrically connected to the output terminal of the second color temperature light-emitting diode D3, and its second end is electrically connected to the first end (i.e., the second contact) of the second color temperature range switch; for the third trimming resistor R30, its first end is electrically connected to the output terminal of the second color temperature light-emitting diode D3, and its second end is electrically connected to the first end (i.e., the fifth contact) of the fourth color temperature range switch; for the fourth trimming resistor R27, its first end is electrically connected to the output terminal of the third color temperature light-emitting diode D4, and its second end is electrically connected to the second end (i.e., the eighth contact) of the fourth color temperature range switch.

[0109] The light-emitting diodes with three color temperature values arranged in descending order from high to low are 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 light-emitting diode with a color temperature of 6500K, the second color temperature light-emitting diode D3 is specifically a light-emitting diode with a color temperature of 4000K, and the third color temperature light-emitting diode D4 is specifically a light-emitting diode with a color temperature of 2700K. Of course, in specific applications, light-emitting diodes with other color temperature values 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 utility model is not limited thereto.

[0110] For the first color temperature light-emitting diode D2, its input end is electrically connected to the common anode input end, its output end is electrically connected to the second end (i.e., the eleventh contact) of the second color temperature gear switch through the first trimming resistor R65, and its output end is electrically connected to the first end (i.e., the first contact) and the second end (i.e., the twelfth contact) of the first color temperature gear switch. For the second color temperature light-emitting diode D3, its input end is electrically connected to the common anode input end, its output end is electrically connected to the first end (i.e., the second contact) of the second color temperature gear switch through the second trimming resistor R50, its output end is electrically connected to the first end (i.e., the fourth contact) of the third color temperature gear switch, and its output end is electrically connected to the first end (i.e., the fifth contact) of the fourth color temperature gear switch through the third trimming resistor R30. For the third color temperature light-emitting diode D4, its input end is electrically connected to the common anode input end, its output end is electrically connected to the first end (i.e., the sixth contact) and the second end (i.e., the seventh contact) of the fifth color temperature gear switch, and its output end is electrically connected to the second end (i.e., the eighth contact) of the fourth color temperature gear switch through the fourth trimming resistor R27.

[0111] Operating conditions of the adjustable color temperature module:

[0112] When the five-CCT toggle switch S1 is toggled to the first color temperature gear switch, the first color temperature is obtained;

[0113] When the five-CCT toggle switch S1 is toggled to the second color temperature gear switch, the resistance values of the first trimming resistor R65 and the second trimming resistor R50 are finely adjusted to obtain the second color temperature;

[0114] When the five-CCT toggle switch S1 is toggled to the third color temperature gear switch, the third color temperature is obtained;

[0115] When the five-CCT toggle switch S1 is toggled to the fourth color temperature gear switch, the resistance values of the third trimming resistor R30 and the fourth trimming resistor R27 are finely adjusted to obtain the fourth color temperature;

[0116] When the five-CCT toggle switch S1 is toggled to the fifth color temperature gear switch, the fifth color temperature is obtained.

[0117] 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 obtained color temperatures are 6500K, 5000K, 4000K, 3000K, and 2700K respectively. 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.

[0118] (2) The first power module

[0119] Please refer to Figure 1 and Figure 3 , the first power module, is electrically connected to the switch common output terminal, and the adjustable color temperature module is grounded through the first power module.

[0120] The first power module includes 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 in series with the fourth resistor R4 and the fifth resistor R5. The second pin of the first power chip U1 is connected in series with the first resistor R1 and the second resistor R2. The second pin of the first power chip U1 is grounded through the third resistor R3, and 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 to 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, and the seventh pin of the first power chip U1 is grounded through the fourteenth resistor R14. The eighth pin of the first power chip U1 is electrically connected to the switch common output terminal of the adjustable color temperature module, and the eighth pin of the first power chip U1 is grounded through the third capacitor C3.

[0121] (3) The second power module

[0122] Please refer to Figure 1 and Figure 4, the second power module includes 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 in series with the twentieth resistor R20 and the twenty-first resistor R21. The second pin of the second power chip U2 is connected in series with the seventeenth resistor R17 and the eighteenth resistor R18. 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 to 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. The eighth pin of the second power chip U2 is electrically connected to the switch common output terminal of the adjustable color temperature module. The eighth pin of the second power chip U2 is grounded through the sixth capacitor C6.

[0123] (V) Rectification Module

[0124] Please refer to Figure 1 and Figure 5 , both the first input terminal and the second input terminal of the rectification module are electrically connected to the power supply. The first output terminal of the rectification module is electrically connected to the common anode input terminal 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 terminal is grounded. The second output terminal of the rectification module is grounded.

[0125] The rectification module includes a rectifier bridge BD1, a fuse resistor F1, a varistor RV1, and a metallized polypropylene film capacitor CBB1. The varistor 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 to 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.

[0126] (VI) Circuit Regulation Module

[0127] Please refer to Figure 1 and Figure 6, one end of the circuit adjustment module is electrically connected to the output end of the rectification 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 adjustment module is electrically connected to the common anode input end of the adjustable color temperature module.

[0128] The circuit adjustment module includes a diode D1, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9. Among them, 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, and the diode D1 is electrically connected to the input end of the parallel circuit.

[0129] (VII) Filter module

[0130] Please also refer to Figure 1 and Figure 7 , the first end of the filter module is electrically connected to the second end of the circuit adjustment module and the common anode input end of the adjustable color temperature module. The second end of the filter module is electrically connected to 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.

[0131] The filter module includes a first electrolytic capacitor EC1, a second electrolytic capacitor EC2, a fifteenth resistor R15, and a sixteenth resistor R16. Among them, the first electrolytic capacitor EC1 and the second electrolytic capacitor EC2 are connected in parallel, and 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.

[0132] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A low color tolerance circuit for a CCT adjustable color temperature lamp, characterized in that, An adjustable color temperature module including a common anode input terminal and a switch common output terminal, the adjustable color temperature module comprising: A five-CCT toggle switch electrically connected to the switch common output terminal, providing 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, the second terminal of which is electrically connected to the second terminal of the second color temperature position switch; A second trimming resistor, the second terminal of which is electrically connected to the first terminal of the second color temperature position switch; A third trimming resistor, the second terminal of which is electrically connected to the first terminal of the fourth color temperature position switch; A fourth trimming resistor, the second terminal of which is electrically connected to the second terminal of the fourth color temperature position switch; A first color temperature light-emitting diode, the input terminal of which is electrically connected to the common anode input terminal, the output terminal of which is electrically connected to the second terminal of the second color temperature position switch through the first trimming resistor, and the output terminal of which is electrically connected to the first and second terminals of the first color temperature position switch; A second color temperature light-emitting diode, the input terminal of which is electrically connected to the common anode input terminal, the output terminal of which is electrically connected to the first terminal of the second color temperature position switch through the second trimming resistor, the output terminal of which is electrically connected to the first terminal of the third color temperature position switch, and the output terminal of which is electrically connected to the first terminal of the fourth color temperature position switch through the third trimming resistor; A third color temperature light-emitting diode, the input terminal of which is electrically connected to the common anode input terminal, the output terminal of which is electrically connected to the first and second terminals of the fifth color temperature position switch, and the output terminal of which is electrically connected to the second terminal of the fourth color temperature position switch through the fourth trimming resistor; 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 from each other and are 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 fine-tuned 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 fine-tuned 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 according to 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 according to claim 1, characterized in that, 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 according to 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 according to claim 1, wherein The low color tolerance circuit further includes: A first power module electrically connected to the switch common output terminal, and the adjustable color temperature module is grounded through the first power module; A second power module electrically connected to the switch common output terminal, and the adjustable color temperature module is grounded through the second power module.

6. The low color tolerance circuit according to claim 5, characterized in that, The first power module includes a first power chip, and its eighth pin is electrically connected to the switch common output terminal.

7. The low color tolerance circuit according to claim 6, wherein The second power module includes a second power chip, and its eighth pin is electrically connected to the switch common output terminal.

8. The low color tolerance circuit according to claim 7, wherein The low color tolerance circuit further includes a rectification module, whose first input terminal and second input terminal are both electrically connected to a power supply, and the first output terminal is electrically connected to the common anode input terminal 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 terminal is grounded.

9. The low color tolerance circuit according to claim 8, wherein The low color tolerance circuit further includes a circuit adjustment module, whose first end is electrically connected to the output terminal of the rectification 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 its second end is electrically connected to the common anode input terminal of the adjustable color temperature module.

10. The low color tolerance circuit according to claim 9, characterized in that, The low color tolerance circuit further includes a filtering module, whose first end is electrically connected to the second end of the circuit adjustment module and the common anode input terminal of the adjustable color temperature module, and the second end is electrically connected to the eighth pin of the first power module, the second pin of the second power module, and the switch common output terminal of the adjustable color temperature module.

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