LED lamp with variable color temperature

Abstract

The utility model provides an LED lamp with variable color temperature, which comprises a PCB (printed circuit board) provided with a plurality of LED lamp beads with different color temperature types, a plurality of LED lamp beads with different color temperature types are arranged, the lamp beads are arranged according to a preset array, and mixed light reaches preset color temperature illumination by adjusting the working states of the lamp beads with different color temperature types and numbers; a plurality of diffusion illumination structures covering the corresponding lamp beads are arranged in the inner lampshade; the inner lampshade further comprises a plurality of light uniformizing structures, and the light uniformizing structures are evenly arranged between every two adjacent diffusion illumination structures. The light uniformizing plate is arranged at the top of the inner lampshade; and the outer lampshade covers the outer sides of the light uniformizing plate and the inner lampshade. The LED lamp is simple in structure, color temperature conversion of different mixed light is achieved through the lamp beads, the inner lampshade and the like which are arranged in a preset array and have different color temperatures, and light mixing uniformity is improved.

Description

Technical Field

[0001] This disclosure relates to the field of lighting equipment technology, and more particularly to a color temperature variable LED lamp. Background Technology

[0002] Currently, lighting equipment is diverse, and different scenarios require different lighting conditions. Traditional single-color-temperature LED lamps cannot flexibly adjust the color temperature. This is especially true for household lighting, which needs to be adjusted to different levels of illumination for varying needs. However, existing color mixing technologies often employ multi-channel drivers or complex algorithms, resulting in high costs and expensive lamps on the market. Furthermore, they suffer from insufficient color temperature mixing uniformity, easily leading to problems such as light spots or color differences.

[0003] To address the problems of existing lighting fixtures, there is a need for a low-cost fixture that can achieve uniform mixing of various color temperatures and has an adjustable color temperature. Utility Model Content

[0004] The purpose of this disclosure is to provide a color temperature-variable LED lamp, thereby solving the aforementioned problems existing in the prior art.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this disclosure are as follows:

[0006] One embodiment of this disclosure provides a color temperature variable LED lamp, the LED lamp comprising:

[0007] The PCB board is equipped with LED beads of various color temperatures. There are multiple LED beads of each color temperature. The beads are arranged in a preset array. By adjusting the working state of the different color temperature types and quantities of LED beads, the mixed light can achieve the preset color temperature illumination.

[0008] The inner lamp cover has multiple diffused light structures covering the corresponding lamp beads; the inner lamp cover also includes multiple light-diffusing structures, which are uniformly arranged between two adjacent diffused light structures.

[0009] A diffuser plate is installed on top of the inner lampshade;

[0010] The outer lamp cover is installed on the outside of the light diffuser and the inner lamp cover.

[0011] For example, both the diffused light structure and the uniform light structure are at a preset distance from the top of the inner lampshade.

[0012] For example, the diffused illumination structure includes a first refractive layer and a second refractive layer with different refractive indices, so that the light from the lamp bead is deflected when it passes through the diffused illumination structure.

[0013] For example, the material of the diffused light structure is polycarbonate or PMMA, which are high-refractive-index materials.

[0014] For example, the light-diffusing structure is a reflector made of metal or plastic.

[0015] For example, the preset array is a concentric circle array.

[0016] For example, the various LED beads with different color temperatures include four types of beads with color temperature values ​​increasing sequentially.

[0017] For example, the concentric circle array includes: three concentric circles with successively increasing diameters: a first concentric circle, a second concentric circle, and a third concentric circle;

[0018] The first concentric circle contains all the LED beads with the lowest color temperature; the first ring between the second concentric circle and the first concentric circle is evenly distributed with LED beads of the other three color temperatures, with at least four of each type, and the three types of LED beads intersect each other.

[0019] The second ring between the second and third concentric circles is evenly distributed with LED beads of the other three color temperatures. The number of each type of LED bead is at least twice the number of LED beads in the first ring, and the three types of LED beads intersect each other.

[0020] The type of LED beads in the first ring is different from the type of LED beads in the second ring.

[0021] For example, nine LED beads with the lowest color temperature are arranged inside the first concentric circle;

[0022] The first ring contains twelve LED beads of the other three color temperatures that are evenly intersected with each other; four LED beads of each color temperature are arranged in a cross shape.

[0023] The second ring contains twenty-four LED beads of the other three color temperatures arranged in a crisscross pattern; eight LED beads of each color temperature.

[0024] For example, with the center of the concentric circle array as the origin, the first ring and the second ring are evenly divided into twelve regions, and each region of the first ring and the second ring corresponds to the other region.

[0025] Each area of ​​the first ring has one LED, and each area of ​​the second ring has two LEDs, the types of which are different from those of the LEDs in the corresponding areas of the first ring.

[0026] The beneficial effects of the embodiments disclosed herein are:

[0027] The LED lamp of this embodiment has LED beads of various color temperatures arranged in a preset array. By adjusting the working state of LED beads of different color temperatures and quantities, the mixed light can achieve the preset color temperature illumination. Combined with the diffused light structure and light homogenizing structure of the inner lamp cover, as well as the light homogenizing plate, the uniformity of light mixing is improved. Attached Figure Description

[0028] Figure 1 This is a side view of a color temperature variable LED lamp according to an embodiment of this disclosure;

[0029] Figure 2 This is a schematic diagram of light refraction of the inner lampshade according to an embodiment of this disclosure;

[0030] Figure 3 This is a side view of a color temperature variable LED lamp according to an embodiment of this disclosure;

[0031] Figure 4 This is a schematic diagram of a color temperature variable LED lamp bead array structure according to an embodiment of the present disclosure.

[0032] In the picture,

[0033] 100. PCB board; 110. LED chips; 111. 2700K low color temperature LED chips; 112. 3000K low color temperature LED chips; 113. 5000K high color temperature LED chips; 114. 6500K high color temperature LED chips; 200. Inner lampshade; 210. Diffusion illumination structure; 211. First refractive layer; 212. Second refractive layer; 220. Light diffusion structure; 300. Light diffusion plate; 400. Outer lampshade; 500. First concentric circle; 600. Second concentric circle; 700. Third concentric circle; 800. First ring; 900. Second ring. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments of this disclosure and are not intended to limit the embodiments of this disclosure.

[0035] like Figures 1 to 3As shown in the figure, this disclosure proposes a variable color temperature LED lamp, which includes: a PCB board 100, which is provided with multiple LED beads 110 of different color temperature types, with multiple LED beads 110 of each color temperature type, and the beads 110 are arranged in a preset array to adjust the working state of the different color temperature types and quantities of LED beads 110 so that the mixed light reaches the preset color temperature illumination; an inner lamp cover 200, which is provided with multiple conical diffusion illumination structures 210 disposed on the corresponding LED beads 110; the inner lamp cover 200 also includes: multiple light-diffusing structures 220, which are uniformly disposed between two adjacent diffusion illumination structures 210; a light-diffusing plate 300 disposed on the top of the inner lamp cover 200; and an outer lamp cover 400 disposed on the outside of the light-diffusing plate 300 and the inner lamp cover 200.

[0036] The LED lamp of this disclosure embodiment can select different types of LED beads with different color temperatures according to actual needs. Specifically, multiple low color temperature LED beads with color temperatures of 2700K and 3000K, and multiple high color temperature LED beads with color temperatures of 5000K and 6500K can be selected and arranged in a preset array. By adjusting the working state of different color temperature types and quantities of LED beads, a mixed light color temperature can be achieved to reach the preset color temperature illumination. Multiple preset color temperature illuminations can be set according to actual needs. The working state of each LED bead can be controlled by the control circuit on the PCB board. Both the inner and outer lamp covers are made of light-transmitting materials.

[0037] The diffused light structure of the inner lampshade increases the illuminated area by refracting and diffusing light. Therefore, the diffused light structure can be made of a high-refractive-index material, such as polycarbonate or PMMA. The thickness of the polycarbonate or PMMA can be set according to actual conditions. Both the diffused light structure and the homogenizing light structure are at a preset distance from the top of the inner lampshade. The light from the LED beads is significantly deflected after being refracted by the diffused light structure, allowing most of the light to be reflected by the homogenizing light structure to achieve a homogenized light effect, thereby reducing the preset distance and the height of the LED beads. Other structures in the inner lampshade besides the diffused light structure can be made of high-refractive-index materials with a preset thickness. The diffused light structure can be a groove structure set inside the inner lampshade, and the top of the groove can be an arc or a pointed shape. The top of the inner lampshade can be covered with a homogenizing light plate, which can be made of a material with homogenizing light function, such as polycarbonate.

[0038] The LED light may further include: a base plate, the PCB board being disposed on the base plate, and the edge of the inner lampshade being fastened to the base plate.

[0039] The LED lamp of this disclosure uses a preset array of LED beads of different color temperatures. By adjusting the working state of the different color temperature types and quantities of LED beads, the mixed light can achieve the preset color temperature illumination. Furthermore, the integration of high refractive index materials and light homogenization structures improves the uniformity of light mixing. The LED lamp of this disclosure achieves mixed light illumination of multiple color temperatures through structural improvements, rather than through complex control methods, thus saving costs.

[0040] like Figure 2 As shown, the diffused illumination structure 210 includes a first refractive layer 211 and a second refractive layer 212 with different refractive indices, so that the light from the lamp bead is deflected when it passes through the diffused illumination structure.

[0041] like Figure 2 As shown, after the incident light from the LED beads illuminates the diffused light structure, it passes through the first and second refractive layers, resulting in a significant change in the outgoing light. The incident angle is α, and the outgoing angle is β, where β > α. This causes the light from the LED beads to be deflected and diffused as it passes through the diffused light structure. The materials and thicknesses of the inner and outer layers of the inner lampshade can be adaptively adjusted by technicians according to the lampshade structure and dimensions. However, the use of a double-layer inner lampshade, i.e., the diffused light structure, and a reflector to enhance the uniform light effect, is within the scope of the embodiments described in this application.

[0042] like Figures 1 to 3 As shown, the light-diffusing structure is a reflector, which can reflect light on both sides and can be made of materials such as aluminum, aluminum alloy, or plastic.

[0043] The height of the bottom of the reflector from the PCB board can be 1.5 to 2 times the height of the LED chips, and can be set according to the actual situation. The height of the reflector can be set according to the desired light uniformity effect. The principle of the reflector height is to effectively reflect light to improve uniformity without interfering with the light of other LED chips.

[0044] like Figure 4 As shown, the preset array is a concentric circle array. The various LED beads with different color temperatures include four types of beads with color temperature values ​​increasing sequentially, namely 2700k low color temperature bead 111, 3000k low color temperature bead 112, 5000k high color temperature bead 113, and 6500k high color temperature bead 114.

[0045] High color temperature (CRT) LEDs share the same anode (+), while the cathodes are differentiated between high CRT (5000K-) and low CRT (3000K-) LEDs. Intermediate CRTs are connected via high CRT (above 5000K-) and low CRT (below 3000K-) cathodes. In other words, all LEDs (regardless of CRT) are connected to the same positive terminal of the power supply, simplifying power supply design and connections. High CRT (5000K and above) and low CRT (3000K and below) LEDs each have their own independent negative terminal, allowing control of the switching or brightness of high and low CRT LEDs by controlling these two different negative terminals. By simultaneously connecting cathodes of high color temperature (5000K and above) and low color temperature (3000K and below) LEDs, light outputs of different color temperatures can be mixed to produce an intermediate color temperature effect between the two extremes. This allows users to adjust the color temperature of the light according to their needs or environmental conditions to obtain a more comfortable or suitable lighting environment for a specific task.

[0046] like Figure 4 As shown, the concentric circle array includes: three concentric circles with progressively increasing diameters: a first concentric circle 500, a second concentric circle 600, and a third concentric circle 700; the first concentric circle 500 contains all LED beads 110 with the lowest color temperature; a first ring 800 between the second concentric circle 600 and the first concentric circle 500 is uniformly provided with LED beads 110 of the other three color temperatures, with at least four of each type, and the three types of LED beads 110 intersect each other; a second ring between the second concentric circle 600 and the third concentric circle 700 is uniformly provided with LED beads 110 of the other three color temperatures, with the number of each type of LED bead 110 being at least twice the number of LED beads 110 in the first ring 800, and the three types of LED beads 110 intersect each other; the types of LED beads 110 in the first ring 800 are different from the types of LED beads 110 in the second ring 900.

[0047] In other words, nine 2700K low color temperature LEDs are evenly distributed within the first concentric circle; twelve 3000K, 5000K, and 6500K high color temperature LEDs are evenly distributed in a crisscross pattern within the first ring between the first and second concentric circles, and four each of the three color temperatures are arranged in a cross shape. The second ring contains 24 evenly distributed 3000K, 5000K, and 6500K high color temperature LEDs, with eight of each color temperature.

[0048] The LED lamps of this disclosure can provide light with various color temperatures to meet different environmental needs and personal preferences. Color temperature is usually expressed in Kelvin (K) and reflects the color characteristics of the light emitted by the light source. The following are some common color temperature ranges and their applicable scenarios:

[0049] Warm white light (approximately 2700K-3000K) presents a warm and comfortable yellow hue, similar to traditional incandescent bulbs. It is suitable for creating a warm and relaxing atmosphere and is commonly found in homes, bedrooms, living rooms, and other spaces requiring comfort. This embodiment can achieve a combined light color temperature of approximately 2800K by adjusting the operation of N1 = 9 low color temperature LEDs with T1 = 2700K and N2 = 12 low color temperature LEDs with T2 = 3000K. This can be calculated using a weighted average method: Tmix = (N1 × T1 + N2 × T2) / (N1 + N2). This results in a combined light color temperature of approximately 2800K. In other words, all 2700K and 3000K low color temperature LEDs within the first concentric circle are operating. Warm white light can also be achieved using other combinations of LEDs, which will not be elaborated here.

[0050] Natural white light (approximately 3500K-4100K) provides a slightly brighter white light that closely resembles natural sunlight. It is suitable for use in offices, kitchens, or bathrooms where good visual clarity is required while maintaining a certain level of comfort. In this embodiment, by adjusting the operation of N1 = 9 low color temperature LEDs with T1 = 2700K, N2 = 4 low color temperature LEDs with T2 = 3000K, N3 = 4 high color temperature LEDs with T3 = 5000K, and N4 = 4 high color temperature LEDs with T4 = 6500K, the combined mixed light color temperature of approximately 3900K can be calculated using a weighted average method: Tmix = (N1×T1 + N2×T2 + N3×T3 + N4×T4) / (N1 + N2 + N3 + N4), which corresponds to the operation of all 2700K low color temperature LEDs within the first concentric circle and the 5000K high color temperature LEDs within the first ring. Warm white light can also be achieved through combinations of other LED beads, which will not be elaborated here.

[0051] Daytime white / cool white light (approximately 5000K-5500K) emits a cool white light, very close to midday sunlight. This color temperature helps improve attention and alertness, making it ideal for work areas, study areas, or task environments requiring precise color discrimination. This embodiment can achieve a combined light color temperature of approximately 5300K by adjusting the operation of N1 = 12 high color temperature LEDs with T1 = 5000K and N2 = 4 high color temperature LEDs with T2 = 6500K. This can be calculated using a weighted average method: Tmix = (N1 × T1 + N2 × T2) / (N1 + N2). This means all the 5000K high color temperature LEDs and the corresponding 6500K high color temperature LEDs in the second and first rings are operating. Warm white light can also be achieved using other combinations of LEDs, which will not be elaborated here.

[0052] Ultra-cool white light (approximately 6000K-6500K and above) appears more bluish-white, giving a fresh and refreshing feeling. It is commonly found in industrial environments, retail shops, or outdoor lighting requiring extremely high brightness. This embodiment can achieve a combined light color temperature of approximately 6500K by adjusting the operation of N1 = 12 high color temperature LEDs with a T1 = 6500K and N2 = 4 high color temperature LEDs with a T2 = 5000K. This can be calculated using a weighted average method: Tmix = (N1×T1 + N2×T2) / (N1 + N2), resulting in a combined light color temperature of approximately 6500K. This means that all 6500K high color temperature LEDs and the corresponding 5000K high color temperature LEDs in the second and first rings are operating. Warm white light can also be achieved through other combinations of LEDs, which will not be elaborated here.

[0053] In addition to the standard color temperature ranges mentioned above, modern LED technology allows manufacturers to produce products with specific color temperatures. Some high-end LED luminaires allow for continuous adjustment of the color temperature within a certain range (e.g., 2700K to 6500K) to suit the needs of different times of day (using cooler tones in the morning to help wake up, and switching to warmer tones in the evening to promote relaxation). Special applications (such as medical, photography, and film production) may require even more precise color temperature control to accurately reproduce colors or achieve specific visual effects.

[0054] In summary, LED lights can provide a wide variety of color temperatures, ranging from warm yellow light to refreshing blue-white light, covering almost all possible application scenarios. The LED lights in this embodiment can also be customized by adjusting the number of LED chips with different color temperatures to achieve a mixed light that meets the preset color temperature requirements.

[0055] In fact, the concentric circle array of this embodiment is divided into twelve regions by the first ring 800 and the second ring 900 with the center of the concentric circle array as the origin. Each region of the first ring 800 and the second ring 900 corresponds to each other. Each region of the first ring 800 is provided with one LED, and each region of the second ring 900 is provided with two LEDs. The types of the two LEDs are different from the types of LEDs in the corresponding regions of the first ring.

[0056] The LED lamp of this disclosure can achieve arbitrary color temperature output within the range of 2700K-6500K with an error of ≤50K; the light mixing uniformity reaches a color deviation that is imperceptible to the human eye (Δuv<0.002); and the cost is reduced by more than 30% compared with traditional smart lamps.

[0057] The above description is only a preferred embodiment of the present disclosure. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present disclosure, and these improvements and modifications should also be considered within the protection scope of the present disclosure.

Claims

1. A color temperature variable LED lamp, characterized in that, The LED light includes: The PCB board (100) is equipped with LED beads (110) of various color temperature types. There are multiple LED beads (110) of each color temperature. Each bead (110) is arranged in a preset array. By adjusting the working state of the different color temperature types and quantities of LED beads (110), the mixed light can achieve the preset color temperature illumination. An inner lampshade (200) is provided inside, and a plurality of diffused light structures (210) covering the corresponding lamp beads (110) are provided inside the inner lampshade (200); the inner lampshade (200) further includes: a plurality of light-diffusing structures (220), and the light-diffusing structures (220) are uniformly disposed between two adjacent diffused light structures (210); A light diffuser (300) is disposed on top of the inner lampshade (200); An outer lamp cover (400) is installed on the outside of the light diffuser (300) and the inner lamp cover (200).

2. The LED lamp according to claim 1, characterized in that, Both the diffused light structure (210) and the uniform light structure (220) are at a predetermined distance from the top of the inner lampshade (200).

3. The LED lamp according to claim 1, characterized in that, The diffused illumination structure (210) includes a first refractive layer (211) and a second refractive layer (212) with different refractive indices, so that the light from the lamp bead is deflected when it passes through the diffused illumination structure.

4. The LED lamp according to claim 3, characterized in that, The diffused light structure is made of high-refractive-index polycarbonate or PMMA.

5. The LED lamp according to any one of claims 1 to 4, characterized in that, The light-diffusing structure (220) is a reflector made of metal or plastic.

6. The LED lamp according to any one of claims 1 to 4, characterized in that, The preset array is a concentric circle array.

7. The LED lamp according to claim 6, characterized in that, The LED beads (110) of various color temperature types include four types of beads (110) with color temperature values ​​increasing sequentially.

8. The LED lamp according to claim 7, characterized in that, The concentric circle array includes: three concentric circles with successively increasing diameters: a first concentric circle (500), a second concentric circle (600), and a third concentric circle (700); The first concentric circle (500) contains all the LED beads (110) with the lowest color temperature; the first ring (800) between the second concentric circle (600) and the first concentric circle (500) is evenly provided with LED beads (110) of the other three color temperatures, with at least four of each type of LED bead (110) and the three types of LED beads (110) intersecting each other. The second ring (900) between the second concentric circle (600) and the third concentric circle (700) is evenly provided with LED beads (110) of the other three color temperatures. The number of each type of LED bead (110) is at least twice the number of LED beads (110) in the first ring (800). The three types of LED beads (110) intersect each other. The type of LED beads (110) in the first ring (800) is different from the type of LED beads (110) in the second ring (900).

9. The LED lamp according to claim 8, characterized in that, Nine LED beads (110) with the lowest color temperature are set inside the first concentric circle (500); The first ring (800) is evenly arranged with twelve LED beads (110) of the other three color temperatures intersecting each other; four LED beads (110) of each color temperature are arranged in a cross shape. The second ring (900) is evenly arranged with LED beads (110) of the other three color temperatures intersecting each other, for a total of twenty-four; there are eight LED beads (110) of each color temperature.

10. The LED lamp according to claim 8, characterized in that, With the center of the concentric circle array as the origin, the first ring (800) and the second ring (900) are evenly divided into twelve regions, and each region of the first ring (800) and the second ring (900) corresponds to the other region. Each region of the first ring (800) is provided with one LED (110), and each region of the second ring is provided with two LEDs (110). The types of the two LEDs (110) are different from the types of LEDs (110) in the corresponding regions of the first ring (800).

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