A COB light source capable of automatically changing color temperature and a COB lamp
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FOSHAN EVERCORE OPTOELECTRONICS TECH
- Filing Date
- 2025-07-11
- Publication Date
- 2026-06-26
AI Technical Summary
Existing adjustable color temperature lighting fixtures are complex in structure and expensive, and cannot automatically adjust the color temperature according to changes in ambient temperature.
The temperature adjustment module on the substrate includes a high-power thermistor and a reference resistor. The color temperature of the light source module is automatically adjusted by adjusting the current flow ratio. The PTC or NTC thermistor changes the current distribution at different temperatures to achieve switching between warm and cool color temperatures.
It achieves automatic color temperature adjustment, has a simple structure and low cost, and meets users' needs for multiple color temperatures and multiple uses.
Smart Images
Figure CN224415088U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of COB technology, and in particular to a COB light source and COB lamp that can automatically change color temperature. Background Technology
[0002] Traditional lighting fixtures generally serve a single purpose: illumination. However, their limited functionality fails to meet users' multi-functional needs for intelligent lighting. To address this, some adjustable color temperature lighting fixtures have emerged, allowing users to control the color temperature via remote control and adapt it to different scenarios. Furthermore, more advanced intelligent lighting fixtures have appeared, such as those with automatic color temperature adjustment. These fixtures use temperature sensors to measure ambient temperature signals and transmit them to a controller within the fixture, which then adjusts the color temperature of the light source accordingly. However, this microcontroller-based automatic color temperature adjustment method results in a more complex and costly structure. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a COB light source and COB lamp that can automatically change color temperature. It can automatically change the color temperature state of the light source module according to the changes in ambient temperature, so as to achieve the effect of automatic color temperature adjustment. Moreover, the overall structure is simple and the cost is low.
[0004] To address the aforementioned technical problems, this utility model provides a COB light source capable of automatically changing color temperature, comprising a substrate. The substrate has at least a temperature sensing area, a soldering area, and a light source area. The light source area contains a light source module, which includes a first color temperature light source module and a second color temperature light source module. The soldering area includes power pads connected to power connection pads on an external drive board and the light source modules, respectively, to provide power to the light source modules. The temperature sensing area includes a temperature adjustment module connected to the power pads, the first color temperature light source module, and the second color temperature light source module, respectively, to adjust the ratio of current flow from the power supply to the first and second color temperature light source modules according to changes in ambient temperature, thereby adjusting the color temperature state of the light source modules.
[0005] As an improvement to the above solution, the temperature adjustment module includes a high-power thermistor, a first reference resistor, and a second reference resistor. The high-power thermistor is connected in parallel with the first reference resistor. The first reference resistor and the first color temperature light source module are connected in parallel with the second color temperature light source module. The second reference resistor is connected in series with the first color temperature light source module via the first reference resistor. The second reference resistor is also connected in series with both the high-power thermistor and the second color temperature light source module. When the high-power thermistor is in a preset low resistance state, most of the power supply current flows to the first color temperature light source module, so that the light source module is in a cool color temperature state. When the high-power thermistor is in a normal state, the power supply current flows to both the first and second color temperature light source modules, so that the light source module is in a mixed color temperature state. When the high-power thermistor is in a preset high resistance state, most of the power supply current flows to the second color temperature light source module, so that the light source module is in a warm color temperature state.
[0006] The temperature adjustment module includes a high-power thermistor, a first reference resistor, and a second reference resistor. The high-power thermistor is connected in parallel with the first reference resistor. The first reference resistor and the second color temperature light source module are connected in parallel with the first color temperature light source module. The second reference resistor is connected in series with the second color temperature light source module via the first reference resistor. The second reference resistor is also connected in series with both the high-power thermistor and the first color temperature light source module. When the high-power thermistor is in a preset low resistance state, most of the power supply current flows to the second color temperature light source module, so that the light source module is in a warm color temperature state. When the high-power thermistor is in a normal state, the power supply current flows to both the first and second color temperature light source modules, so that the light source module is in a mixed color temperature state. When the high-power thermistor is in a preset high resistance state, most of the power supply current flows to the first color temperature light source module, so that the light source module is in a cool color temperature state.
[0007] As an improvement to the above solution, the first color temperature light source module includes multiple cold color temperature LED modules connected in series, and the first reference resistors are respectively disposed at both ends of the first color temperature light source module, and the first reference resistors at both ends are respectively connected to the power pads through the second reference resistors; the second color temperature light source module includes multiple warm color temperature LED modules connected in series.
[0008] As an improvement to the above solution, the second color temperature light source module includes multiple warm color temperature LED modules connected in series, and the first reference resistors are respectively disposed at both ends of the second color temperature light source module, and the first reference resistors at both ends are respectively connected to the power pads through the second reference resistors; the first color temperature light source module includes multiple cool color temperature LED modules connected in series.
[0009] As an improvement to the above solution, the high-power thermistor includes a first high-power thermistor and a second high-power thermistor. The first high-power thermistor is connected in parallel with the first reference resistor located at one end, and the second high-power thermistor is connected in parallel with the first reference resistor located at the other end.
[0010] As an improvement to the above solution, the high-power thermistor is a PTC thermistor or an NTC thermistor.
[0011] As an improvement to the above solution, the warm color temperature LED module and the cool color temperature LED module are arranged in a cross pattern on the light source area.
[0012] As an improvement to the above solution, the substrate is further provided with a driving area, in which a constant current driving module is provided. The constant current driving module is connected to the power pad and the light source module respectively, and is used to drive the light source module to work at a constant current.
[0013] This utility model also discloses a COB lamp, including a lamp body and the aforementioned COB light source that can automatically change color temperature, wherein the COB light source that can automatically change color temperature is disposed in the lamp body.
[0014] The beneficial effects of implementing this utility model are as follows:
[0015] This invention can automatically adjust the current flow of the power supply to the first color temperature light source module and the second color temperature light source module according to the changes in ambient temperature through the temperature measurement and adjustment module on the substrate, so as to adjust the color temperature state of the light source module and achieve the effect of automatic color temperature adjustment. It meets the user's needs for multiple color temperatures and multiple uses, and the overall structure is simple and low in cost. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the first embodiment of the COB light source that can automatically change color temperature according to this utility model.
[0017] Figure 2 yes Figure 1 Circuit diagram of the first embodiment of the COB light source;
[0018] Figure 3 This is a circuit diagram of the second embodiment of the COB light source of this utility model. Detailed Implementation
[0019] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.
[0020] like Figure 1 As shown, Figure 1 The diagram shows a first embodiment of a COB light source capable of automatically changing color temperature according to the present invention. It includes a substrate 1, on which at least a temperature sensing area 2, a soldering area 3, and a light source area 4 are provided. The light source area 4 contains a light source module 5, which includes a first color temperature light source module 51 and a second color temperature light source module 52. The soldering area 3 includes a power pad 31, which is connected to both the power connection pad of an external driver board and the light source module 5, respectively, to receive power from the external driver board and output it to the light source module 5, thereby powering the light source module 5.
[0021] The temperature sensing zone 2 includes a temperature adjustment module 21, which is connected to the power pad 31, the first color temperature light source module 51, and the second color temperature light source module 52 respectively. It is used to adjust the current flow of the power supply to the first color temperature light source module 51 and the second color temperature light source module 52 according to the change of ambient temperature, so as to change the color temperature state of the light source module 5 and achieve the effect of automatic color temperature adjustment, so as to meet the user's multi-color temperature and multi-purpose use needs.
[0022] Specifically, such as Figure 2 As shown, Figure 2 The circuit diagram of the first embodiment of the COB light source of this utility model is shown. The temperature adjustment module 21 includes a high-power thermistor 211, a first reference resistor 212, and a second reference resistor 213. The high-power thermistor 211 is connected in parallel with the first reference resistor 212. The first reference resistor 212 and the first color temperature light source module 51 are connected in parallel with the second color temperature light source module 52. The second reference resistor 213 is connected in series with the first color temperature light source module 51 through the first reference resistor 212. The second reference resistor 213 is also connected in series with the high-power thermistor 211 and the second color temperature light source module 52 respectively.
[0023] It should be noted that the rated resistance of the high-power thermistor 211, the resistance of the first reference resistor 212, and the resistance of the second reference resistor 213 are all preset so that the resistance of the high-power thermistor 211 changes significantly within the corresponding temperature range, thereby adjusting the current flow ratio and realizing the above-mentioned color temperature switching function.
[0024] In this embodiment, the resistance of the second reference resistor 213 is set to zero ohms. At this time, it is equivalent to the high-power thermistor 211 being used only in parallel with the first reference resistor 212. The first reference resistor 212 in parallel is used as a curve compensation for the resistance value change of the high-power thermistor 211, that is, the linearization compensation of the nonlinear curve of the high-power thermistor 211 is realized, thereby improving the accuracy and stability of temperature measurement, and further improving the accuracy and stability of color temperature adjustment of the circuit.
[0025] During use, when the resistance of the high-power thermistor 211 decreases to a very low value as the ambient temperature drops, it is in a preset low-resistance state. At this time, most of the power supply current flows to the first color temperature light source module 51, while the current flowing to the second color temperature light source module 52 is minimal. Consequently, the color temperature display of the second color temperature light source module 51 is extremely low, causing the light source module 5 to be biased towards a cool color temperature state. When the high-power thermistor 211 returns to its normal state as the ambient temperature changes, its resistance increases within the normal range, allowing it to operate normally. At this time, the power supply current flows to both the first and second color temperature light source modules 51 and 52, respectively, and both work together to display the color temperature, thus placing the light source module 5 in a mixed color temperature state. As the ambient temperature rises, the resistance of the high-power thermistor 211 becomes extremely high. At this point, the thermistor 211 is in a preset high-resistance state, and most of the power supply current flows to the second color temperature light source module 52. Correspondingly, the current flowing to the first color temperature light source module 51 is minimal, resulting in a very low color temperature display. This causes the light source module 51 to be biased towards a warm color temperature. This method automatically enables multiple color temperature switching functions, achieving automatic color temperature adjustment and meeting the user's needs for multiple color temperatures and applications.
[0026] Preferably, in other embodiments, the resistance of the first reference resistor 212 can be set to infinity, that is, its resistance is very large, equivalent to infinity. In this case, it is equivalent to the high-power thermistor 211 being used only in series with the second reference resistor 213. The linearization compensation of the nonlinear curve of the high-power thermistor 211 is achieved through the first reference resistor 212 in series, thereby improving the accuracy and stability of temperature measurement, and thus improving the accuracy and stability of color temperature adjustment of the circuit. The above-mentioned color temperature adjustment function can also be achieved through this circuit method, and its working principle is similar, so it will not be described in detail here.
[0027] Furthermore, such as Figure 2As shown, the first color temperature light source module 51 includes a plurality of cold color temperature LED modules 511 connected in series, and the first reference resistors 212 are respectively disposed at both ends of the first color temperature light source module. The first reference resistors 212 at both ends are respectively connected to the corresponding power terminals of the power pads via the second reference resistors 213. The second color temperature light source module 52 includes a plurality of warm color temperature LED modules 521 connected in series.
[0028] The thermistor 211 includes a first high-power thermistor RT1 and a second high-power thermistor RT2. The first high-power thermistor RT1 is connected in parallel with the first reference resistor R1 located at one end, and the second high-power thermistor RT2 is connected in parallel with the first reference resistor R2 located at the other end. This allows it to adapt to the driving connection of the constant current driving module in the high-side constant current output mode or the driving connection of the constant current driving module in the low-side constant current output mode, thereby ensuring that the light source module 5 can be driven to work stably and with high adaptability.
[0029] When the high-power thermistor 211 decreases with the ambient temperature and reaches a preset low resistance value, most of the current flows to the first color temperature light source module 51, while the current flowing to the second color temperature light source module 52 is minimal, thus causing the light source module 5 to be biased towards a cool color temperature. When the high-power thermistor 211 returns to its normal state with changes in ambient temperature, the current flows to both the first and second color temperature light source modules 51 and 52, respectively, and both work together to display the color temperature, thus causing the light source module 5 to be in a mixed color temperature state. When the high-power thermistor 211 increases with the ambient temperature and reaches a preset high resistance value, most of the current flows to the second color temperature light source module 52, while the current flowing to the first color temperature light source module 51 is minimal, thus causing the light source module 5 to be biased towards a warm color temperature. Through this method, multiple color temperature switching functions can be automatically realized, thereby achieving the effect of automatic color temperature adjustment and meeting the user's needs for multiple color temperatures and multiple applications.
[0030] Preferably, in this embodiment, the high-power thermistor 211 is a PTC thermistor, but it is not limited thereto. An NTC thermistor can also be used according to actual needs to achieve the corresponding multiple color temperature switching functions.
[0031] Preferably, such as Figure 1As shown, the substrate 1 also includes a driving region 6, in which a constant current driving module 61 is provided. The constant current driving module 61 is connected to the power pad 31 and the light source module 5, respectively, and is used to receive external power and power on, thereby outputting constant current power to the light source module 5, enabling the light source module 5 to operate at a constant current. In other embodiments, the constant current driving module 61 can be directly placed in an external driving board, thereby driving the light source module 5 to operate at a constant current via the power pad 31.
[0032] Preferably, the warm color temperature LED module 521 and the cool color temperature LED module 511 are arranged in a cross pattern on the light source area to improve the mixed color temperature effect between the two.
[0033] like Figure 3 As shown, Figure 3 This diagram shows a circuit diagram of a second embodiment of the COB light source of this invention. This embodiment is similar to... Figure 2 Unlike the first embodiment shown, this embodiment can display a warm color temperature when the ambient temperature is low and a cool color temperature when the temperature is high. In cold environments, the warm color temperature can give people a feeling of warmth, and in hot weather, the cool color temperature can give people a feeling of coolness.
[0034] In this embodiment, the temperature adjustment module 21 includes a high-power thermistor 211, a first reference resistor, and a second reference resistor 213. The high-power thermistor 211 is connected in parallel with the first reference resistor 212. The first reference resistor 212 module and the second color temperature light source module 52 are connected in parallel with the first color temperature light source module 51. The second reference resistor 213 is connected in series with the second color temperature light source module 52 via the first reference resistor 212. The second reference resistor 213 is also connected in series with the high-power thermistor and the first color temperature light source module 51, respectively.
[0035] During use, when the resistance of the high-power thermistor 211 decreases to a very low value as the ambient temperature drops, it is in a preset low-resistance state. At this time, most of the power supply current flows to the second color temperature light source module 52, while the current flowing to the first color temperature light source module 51 is minimal, thus causing the light source module 5 to be biased towards a warm color temperature. When the high-power thermistor 211 returns to its normal state as the ambient temperature changes, its resistance increases and remains within the normal range. At this time, the power supply current flows to both the first color temperature light source module 51 and the second color temperature light source module 52, and both work together to display the color temperature, thus placing the light source module 5 in a mixed color temperature state. As the ambient temperature rises, the resistance of the high-power thermistor 211 becomes very high. At this point, the thermistor 211 is in a preset high-resistance state, and most of the power supply current flows to the first color temperature light source module 51. Correspondingly, the current flowing to the second color temperature light source module 52 is minimal, thus causing the light source module 52 to be biased towards a cool color temperature state. This method also automatically achieves multiple color temperature switching functions, thus realizing the effect of automatic color temperature adjustment. In cold environments, a warm color temperature can provide a feeling of warmth, and in hot weather, a cool color temperature can provide a feeling of coolness, meeting the user's needs for multiple color temperatures and applications.
[0036] Furthermore, the second color temperature light source module 52 includes a plurality of warm color temperature LED modules 521 connected in series, and the first reference resistors 212 are respectively disposed at both ends of the second color temperature light source module, and the first reference resistors 212 at both ends are respectively connected to the power pads via the second reference resistors 213; the first color temperature light source module 51 includes a plurality of cold color temperature LED modules 511 connected in series.
[0037] When the high-power thermistor 211 decreases with ambient temperature and reaches a preset low resistance value, most of the current flows to the second color temperature light source module 52, while the current flowing to the first color temperature light source module 51 is minimal, thus causing the light source module 5 to be biased towards a warm color temperature. When the high-power thermistor 211 returns to its normal state with changes in ambient temperature, the current flows to both the first color temperature light source module 51 and the second color temperature light source module 52, both working together to display the color temperature, thus causing the light source module 5 to be in a mixed color temperature state. When the high-power thermistor 211 increases with ambient temperature and reaches a preset high resistance value, most of the current flows to the first color temperature light source module 51, while the current flowing to the second color temperature light source module 52 is minimal, thus causing the light source module 5 to be biased towards a cool color temperature. Through this method, multiple color temperature switching functions can be automatically realized, thereby achieving the effect of automatic color temperature adjustment and meeting the user's needs for multiple color temperatures and multiple applications.
[0038] This utility model also discloses a COB lamp, including a lamp body and the aforementioned COB light source with automatically changing color temperature, wherein the COB light source with automatically changing color temperature is disposed in the lamp body. Since the ambient temperature at the COB light source changes with the ambient temperature outside the lamp housing during installation and use, and changes in the external ambient temperature also change the ambient temperature at the COB light source, the COB light source can automatically switch or change its color temperature according to changes in the external ambient temperature. Therefore, since the aforementioned COB light source with automatically changing color temperature has the aforementioned technical effects, COB lamps including the aforementioned COB light source with automatically changing color temperature should also have the aforementioned technical effects, which will not be elaborated further here.
[0039] In summary, this utility model can automatically adjust the ratio of the power supply current flowing to the first color temperature light source module and the second color temperature light source module according to changes in ambient temperature, so as to adjust the color temperature state of the light source module and achieve the effect of automatic color temperature adjustment. It meets the user's needs for multiple color temperatures and multiple uses, and the overall structure is simple and low in cost.
[0040] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.
Claims
1. A COB light source capable of automatically changing color temperature, characterized in that, The substrate includes a temperature sensing area, a welding area and a light source area, and the light source area includes a light source module, which includes a first color temperature light source module and a second color temperature light source module. The welding area includes a power pad, which is connected to the power connection pad of the external drive board and the light source module respectively, and is used to provide power to the light source module. The temperature sensing area includes a temperature adjustment module, which is connected to the power pad, the first color temperature light source module, and the second color temperature light source module respectively. It is used to adjust the ratio of the power supply current flowing to the first color temperature light source module and the second color temperature light source module according to the change of ambient temperature, so as to adjust the color temperature state of the light source module.
2. The COB light source capable of automatically changing color temperature as described in claim 1, characterized in that, The temperature measurement and adjustment module includes a high-power thermistor, a first reference resistor, and a second reference resistor, wherein the high-power thermistor is connected in parallel with the first reference resistor. The first reference resistor and the first color temperature light source module are connected in parallel with the second color temperature light source module. The second reference resistor is connected in series with the first color temperature light source module via the first reference resistor. The second reference resistor is also connected in series with the high-power thermistor and the second color temperature light source module. When the high-power thermistor is in a preset low resistance state, most of the current from the power supply flows to the first color temperature light source module, so that the light source module is in a cool color temperature state. When the high-power thermistor is in normal condition, the current from the power supply flows to the first color temperature light source module and the second color temperature light source module respectively, so that the light source module is in a mixed color temperature state. When the high-power thermistor is in a preset high resistance state, most of the current from the power supply flows to the second color temperature light source module, so that the light source module is in a warm color temperature state.
3. The COB light source capable of automatically changing color temperature as described in claim 1, characterized in that, The temperature measurement and adjustment module includes a high-power thermistor, a first reference resistor, and a second reference resistor, wherein the high-power thermistor is connected in parallel with the first reference resistor. The first reference resistor and the second color temperature light source module are connected in parallel with the first color temperature light source module. The second reference resistor is connected in series with the second color temperature light source module through the first reference resistor. The second reference resistor is also connected in series with the high-power thermistor and the first color temperature light source module respectively. When the high-power thermistor is in a preset low resistance state, most of the current from the power supply flows to the second color temperature light source module, so that the light source module is in a warm color temperature state. When the high-power thermistor is in normal condition, the current from the power supply flows to the first color temperature light source module and the second color temperature light source module respectively, so that the light source module is in a mixed color temperature state. When the high-power thermistor is in a preset high resistance state, most of the current from the power supply flows to the first color temperature light source module, so that the light source module is in a cool color temperature state.
4. The COB light source capable of automatically changing color temperature as described in claim 2, characterized in that, The first color temperature light source module includes multiple cold color temperature LED modules connected in series. The first reference resistors are respectively disposed at both ends of the first color temperature light source module, and the first reference resistors at both ends are respectively connected to the power pads via the second reference resistors. The second color temperature light source module includes multiple warm color temperature LED modules connected in series.
5. The COB light source capable of automatically changing color temperature as described in claim 3, characterized in that, The second color temperature light source module includes multiple warm color temperature LED modules connected in series. The first reference resistors are respectively disposed at both ends of the second color temperature light source module, and the first reference resistors at both ends are respectively connected to the power pads through the second reference resistors. The first color temperature light source module includes multiple cool color temperature LED modules connected in series.
6. The COB light source capable of automatically changing color temperature as described in claim 4 or 5, characterized in that, The high-power thermistor includes a first high-power thermistor and a second high-power thermistor. The first high-power thermistor is connected in parallel with the first reference resistor located at one end, and the second high-power thermistor is connected in parallel with the first reference resistor located at the other end.
7. The COB light source capable of automatically changing color temperature as described in claim 6, characterized in that, The high-power thermistor is a PTC thermistor or an NTC thermistor.
8. The COB light source capable of automatically changing color temperature as described in claim 4 or 5, characterized in that, The warm color temperature LED module and the cool color temperature LED module are arranged in a cross pattern on the light source area.
9. The COB light source capable of automatically changing color temperature as described in claim 1, characterized in that, The substrate is further provided with a driving area, in which a constant current driving module is provided. The constant current driving module is connected to the power pad and the light source module respectively, and is used to drive the light source module to work at a constant current.
10. A COB lamp, characterized in that, The lamp body includes a COB light source capable of automatically changing color temperature as described in any one of claims 1 to 9, wherein the COB light source capable of automatically changing color temperature is disposed in the lamp body.