Light emitting device

Abstract

The light-emitting device provided by the embodiment of the utility model comprises a first light source; the second light source is connected in series with the first light source and forms a first branch with the first light source; the diverter is connected in parallel with the second light source, and the diverter is connected in series with the first light source; the third light source is connected with the first branch in parallel, the color temperature of the third light source is higher than that of the first light source and that of the second light source, and the color temperature of the first light source is the same as that of the second light source. According to the light-emitting device, the first light source, the third light source and the second light source which are lightened step by step are arranged, so that the color temperature of overall light emitting of the light-emitting device gradually shifts from the color temperature of the first light source to the color temperature of the third light source, and the color temperature gradual change process simulating gradual lightening of an incandescent lamp is presented.

Description

Technical Field

[0001] The utility model relates to the field of optoelectronic technology, in particular to a light-emitting device. Background Art

[0002] As a heat radiation light source, the traditional incandescent lamp generally has a tungsten filament as its light-emitting element. The incandescent lamp is connected to an external power source and conducts current on the tungsten filament, and the current heats the tungsten filament to a certain temperature, so that the tungsten filament emits light. The luminous efficiency of incandescent lamps is generally low. For example, the luminous efficiency of incandescent lamps with tungsten filaments as light-emitting elements is generally less than 5%, that is, generally less than 5% of the energy obtained by incandescent lamps will be converted into light energy, and the remaining energy is generally lost in the form of heat. Therefore, incandescent lamps on the market are gradually replaced by energy-saving lamps. However, during the lighting process of a general incandescent lamp, the color temperature of the light it emits will undergo a gradual change process. There is still a market demand for light-emitting devices with such a gradual color temperature change process, so how to design a lamp that can simulate the gradual color temperature change process of an incandescent lamp is a technical problem that needs to be solved. Utility Model Content

[0003] In order to solve the technical problem of how to simulate the gradual color temperature change process of an incandescent lamp, the utility model provides a light emitting device. The light emitting device sets light sources with different color temperatures and a diverter so that the light sources with different color temperatures light up step by step, thereby achieving the technical effect of gradually changing the overall color temperature of the light emitting device.

[0004] The light-emitting device provided by the embodiment of the utility model includes: a first light source; a second light source connected in series with the first light source and forming a first branch with the first light source; a shunt connected in parallel with the second light source, and the shunt is connected in series with the first light source; a third light source connected in parallel with the first branch, the color temperature of the third light source is higher than the color temperature of the first light source and the color temperature of the second light source, respectively, and the color temperature of the first light source is the same as the color temperature of the second light source.

[0005] In an embodiment of the present invention, there are multiple third light sources, and the multiple third light sources are connected in series to form a second branch, and the second branch is connected in parallel with the first branch.

[0006] In one embodiment of the present invention, there are multiple second branches, and the multiple second branches are connected in parallel.

[0007] In an embodiment of the present invention, there are multiple first light sources, and the multiple first light sources are connected in series and connected in series with the second light source to form the first branch.

[0008] In one embodiment of the present invention, there are multiple first branches, and the multiple first branches are connected in parallel.

[0009] In one embodiment of the utility model, the diverter is simultaneously connected in parallel to multiple second light sources in the first branches; or, the number of the diverters is multiple, and the multiple diverters are connected in parallel to multiple second light sources in the first branches one by one; or, the number of the diverters is multiple, and the multiple diverters are respectively connected in parallel to multiple second light sources in the first branch.

[0010] In one embodiment of the present invention, the color temperature of the third light source is greater than the color temperature of the first light source and the color temperature of the second light source; and the number of the third light sources is greater than the total number of the first light sources and the second light sources.

[0011] In one embodiment of the utility model, there are multiple first light sources, multiple first light sources are connected in series, and connected in series with the second light source to form the first branch; there are multiple first branches, and multiple first branches are connected in parallel, and the ratio of the number of the first branch to the second branch is:; the first branch includes multiple first light sources and one second light source; the second branch includes multiple third light sources; the number of the third light sources in any second branch is the same as the sum of the number of the first light source and the second light source in any first branch; the first light source, the second light source and the third light source are light-emitting diode devices with the same starting voltage.

[0012] In one embodiment of the present invention, the color temperature of the first light source and the color temperature of the second light source are greater than or equal to 1500K and less than or equal to 2100K; the color temperature of the third light source is greater than or equal to 3100K and less than or equal to 3300K.

[0013] In one embodiment of the present invention, as the total current of the light emitting device gradually increases, the first light source lights up first, the third light source lights up second, and the second light source lights up last.

[0014] The above technical solution provided by the embodiment of the utility model has at least the following beneficial effects:

[0015] By providing the shunt, when the light-emitting component is powered on, as the total current of the light-emitting component gradually increases, the first light source works first, and the shunt short-circuits the second light source. As the total current further increases, the third light source starts to work, and at this time, the color temperature of the light emitted by the light-emitting device is a mixture of the color temperatures of the first light source and the third light source, that is, between the color temperatures of the light emitted by the first light source and the third light source; as the total current further increases, the second light source starts to work, thereby adjusting the color temperature of the light emitted by the light-emitting device as a whole, and making the color temperature of the light emitted by the light-emitting device as a whole stabilize at a specific value when the total current of the light-emitting component further increases; the light-emitting device is set to light up step by step, so that the color temperature of the light emitted by the light-emitting device as a whole will gradually shift from the color temperature of the first light source to the color temperature of the third light source, thereby presenting a color temperature gradient process simulating the gradual lighting of an incandescent lamp; after reaching a certain specific value, the color temperature of the light emitted by the light-emitting device as a whole stabilizes, and no longer increases with the increase of the total current, thereby meeting the requirements of different user terminals for the same color temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a current-color temperature curve diagram of the light-emitting device provided in an embodiment of the utility model.

[0018] Figure 2 This is an equivalent circuit diagram of the light emitting device provided in an embodiment of the utility model.

[0019] Figure 3 for Figure 2 The current ratio diagram of different branches of the lighting device shown.

[0020] Figure 4 An equivalent circuit diagram of another light emitting device provided in an embodiment of the utility model.

[0021] Figure 5 This is an equivalent circuit diagram of another light-emitting device provided in an embodiment of the utility model.

[0022] Figure 6 A schematic diagram of the planar structure of a light emitting device provided in an embodiment of the utility model.

[0023] Figure 7 A schematic diagram of the planar structure of another light emitting device provided in an embodiment of the utility model.

[0024] Reference Numbers

[0025] 10. Light-emitting device; 122. First light source; 124. Second light source; 12. First branch; 126. Diverter; 142. Third light source; 14. Second branch; 121. First diverter; 123. Second diverter; 125. Third diverter; 127. Fourth diverter. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] It should be noted that the terms "first", "second" and "one end" in the specification and claims of the utility model are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, products or devices.

[0028] The utility model embodiment provides a Figure 6 or Figure 7 The light emitting device 10 shown. The equivalent circuit of the light emitting device 10 is as follows: Figure 2 As shown. The light emitting device 10 includes: a first light source 122, a second light source 124, a third light source 142 and a diverter 126. The second light source 124 is connected in series with the first light source 122, and forms a first branch 12 with the first light source 122. The diverter 126 is connected in parallel with the second light source 124, and the diverter 126 is connected in series with the first light source 122. The third light source 142 is connected in parallel with the first branch 12, and the color temperature of the third light source 142 is higher than that of the first light source 122 and the second light source 124.

[0029] The light-emitting device 10 provided by the embodiment of the utility model is provided with a second light source 124 and a shunt 126 connected in parallel, so that when the light-emitting component is powered on, as the total current of the light-emitting component gradually increases, the first light source 122 works first, and the shunt 126 short-circuits the second light source 124. As the total current further increases, the third light source 142 starts to work, and at this time the overall color temperature of the light-emitting device 10 is a mixture of the color temperatures of the first light source 122 and the third light source 142, that is, between the color temperatures of the light emitted by the first light source 122 and the third light source 142. As the total current further increases, the second light source 124 lights up and works, and participates in the color temperature adjustment of the light-emitting device 10, so that the overall color temperature of the light-emitting device 10 is stabilized at a specific value as the total current of the light-emitting component further increases. The second light source 124 usually has the same color temperature as the first light source 122. Compared with some traditional dimming circuits that are not provided with the second light source 124, the light-emitting device 10 of the present invention generates less heat from the shunt 126 under higher current conditions, and the entire light-emitting device 10 is more energy-efficient.

[0030] In summary, the light-emitting device 10 provided in the embodiment of the present invention sets a first light source 122, a third light source 142, and a second light source 124 that light up in stages, so that the color temperature of the overall light emitted by the light-emitting device 10 gradually shifts from the color temperature of the first light source 122 to the color temperature of the third light source 142, thereby presenting a color temperature gradient process that simulates the gradual lighting of an incandescent lamp. In addition, the light-emitting device 10 will stably output the color temperature within a certain current or power range, and the stably output color temperature is the color temperature of the mixed output of the first light source 122, the second light source 124, and the third light source 142. Therefore, the light-emitting device 10 provided in the embodiment of the present invention can achieve a color temperature change from 0-xmA to the color temperature of the third light source 142 under an input current, and when the current is greater than xmA, the color temperature of the light-emitting device 10 remains unchanged, for example Figure 1 As shown in the ideal curve, in the range of 0 to 400 mA, the overall color temperature of the light-emitting device 10 shifts to 3000K, and after 400 mA, the overall color temperature of the light-emitting device 10 remains stable at 3000K, which is different from the existing product solutions. Therefore, the light-emitting device 10 provided in the embodiment of the utility model can cover the application requirements under different currents to meet the needs of different customers, thereby meeting the product customization needs and power distribution settings of different customers. Among them, the value of the above x can be adjusted by changing the resistance value of the shunt 126, the number of the second light sources 124 and the ratio of the first branch 12 to the second branch 14, and its specific implementation is as follows.

[0031] Specifically, the first light source 122, the second light source 124 and the third light source 142 may include, for example, various diode light-emitting elements such as LEDs; a light-emitting body such as LEDs combined with fluorescent glue may also be used as the first light source 122, the second light source 124 and the third light source 142. The shunt 126 includes, for example, a resistor element, or a conductive element with a certain resistance value. Taking the first light source 122, the second light source 124 and the third light source 142 as an example of an LED element as a light-emitting body, the starting voltages of the first light source 122, the second light source 124 and the third light source 142 may be set to different values, for example, the starting voltage of the third light source 142 is between the starting voltage of the first light source 122 and the sum of the starting voltages of the first light source 122 and the second light source 124; or, the starting voltages of the first light source 122, the second light source 124 and the third light source 142 are the same, the number of the third light source 142 is multiple, and the multiple third light sources 142 are connected in series to form the second branch 14, and the second branch 14 is connected in parallel with the first branch 12.

[0032] By providing a plurality of third light sources 142, the color temperature ratio of the first branch 12 and the second branch 14 can be adjusted. As the number of third light sources 142 increases, the overall color temperature of the lighting device 10 will shift toward the color temperature of the third light sources 142.

[0033] Furthermore, when there are multiple third light sources 142, there may also be multiple second branches 14, and multiple second branches 14 are connected in parallel. The power source connected to the light-emitting device 10 generally has a maximum output voltage for its use. For example, if the maximum output voltage is 36V and the starting voltage of the third light source 142 is 3V, the maximum number of third light sources 142 that can be connected in series in a single second branch 14 is 12. By providing multiple second branches 14, the number of third light sources 142 can be further increased, so that the overall color temperature of the light emitted by the light-emitting device 10 is further shifted toward the color temperature of the third light source 142.

[0034] Further, see Figure 2 , the number of the first light sources 122 is multiple, the multiple first light sources 122 are connected in series, and connected in series with at least one second light source 124 to form a first branch 12. By providing multiple first light sources 122, the overall color temperature of the light-emitting device 10 can be shifted toward the color temperature of the first light source 122. In addition, the number of the first light source 122 and the third light source 142 can be set to multiple, thereby increasing the overall luminous intensity of the light-emitting device 10.

[0035] Furthermore, in the case where there are multiple first light sources 122, there can be multiple first branches 12, and multiple first branches 12 are connected in parallel. Therefore, under the premise that the maximum voltage of the power supply of the light-emitting device 10 is limited, more first light sources 122 are added to adjust the overall color temperature and light intensity of the light emitted by the light-emitting device 10.

[0036] Specifically, the first light source 122, the second light source 124, and the third light source 142 may use the same LED, but cover the corresponding light sources with different phosphor ratios to achieve the technical effect of the above light sources having different color temperatures. In an embodiment of the utility model, the color temperatures of the first branch 12 and the second branch 14 may be set to different values, which is specifically achieved by setting the color temperatures of the first light source 122, the second light source 124, and the third light source 142. For example, in the light-emitting device 10, the color temperature of the first light source 122 and the color temperature of the second light source 124 are greater than or equal to 1500K, and less than or equal to 2100K; the color temperature of the third light source 142 is greater than or equal to 3100K, and less than or equal to 3300K. More specifically, if the color temperature of the first light source 122 and the second light source 124 is 1800K, and the color temperature of the third light source 142 is 3200K, the overall color temperature of the light emitting device 10 is between 1800K and 3200K, and its specific value depends on the number of the first light source 122, the second light source 124 and the third light source 142.

[0037] Furthermore, the color temperature of the third light source 142 is greater than the color temperature of the first light source 122 and the color temperature of the second light source 124, respectively; and the number of the third light sources 142 is greater than the total number of the first light sources 122 and the second light sources 124. Thus, the overall color temperature of the light emitting device 10 will shift toward the color temperature of the third light source 142, and thus present a higher color temperature.

[0038] Specifically, Figure 2 The equivalent circuit of the light-emitting component shown is exemplified. In the light-emitting device 10 provided in the embodiment of the utility model, the number of the first light source 122 is multiple, and the multiple first light sources 122 are connected in series, and are connected in series with the second light source 124 to form a first branch 12. The number of the first branch 12 is multiple, and the multiple first branches 12 are connected in parallel with each other. The number ratio of the first branch 12 to the second branch 14 can be, for example, 1:3. The first branch 12 includes multiple first light sources 122 and includes a second light source 124. The second branch 14 includes multiple third light sources 142. The number of the third light sources 142 in any second branch 14 is the same as the sum of the number of the first light sources 122 and the second light sources 124 in any first branch 12. The first light source 122, the second light source 124 and the third light source 142 include light-emitting diode devices with the same starting voltage. Among them, the light-emitting device 10 includes, for example, two first branches 12 and six second branches 14. Each first branch 12 includes, for example, 11 first light sources 122 and 1 second light source 124 ; each second branch 14 includes, for example, 12 third light sources 142 .

[0039] Below through Figure 2 The equivalent circuit shown illustrates the operation of the light emitting device 10. Figure 2The equivalent circuit shown has a total voltage applied to both sides through the power supply. The first light source 122, the second light source 124 and the third light source 142, for example, include LED elements with the same starting voltage, and the first light source 122 and the second light source 124 have the same color temperature, and the color temperature of the third light source 142 is higher than the color temperature of the first light source 122 and the second light source 124. When the total voltage does not reach the total starting voltage of the multiple first light sources 122 connected in series in the first branch 12, the first branch 12 and the second branch 14 are not turned on. As the total voltage rises and reaches the total starting voltage of the multiple first light sources 122 connected in series in the first branch 12, the multiple first light sources 122 connected in series in the first branch 12 are turned on, and the corresponding conduction current passes through the shunt 126, and the shunt 126 short-circuits the second light source 124. At this time, only the multiple first light sources 122 in the two first branches 12 are lit, and at this time, the color temperature of the light-emitting device 10 is the same as the color temperature of the first light source 122, for example, 1800K. The above process corresponds to Figure 1 The ideal curve when the color temperature is 1800K. At this time, the total current of the light emitting device 10 corresponding to the total voltage is low. More specifically, see Figure 3 For example, two first branches 12 form an A branch, and six second branches 14 form a B branch. Each first branch 12 exists as an A branch, and each second branch 14 exists as a B branch. Figure 3 The first section in corresponds to the above-mentioned light emitting device when only the first light source 122 is lit. At this time, only the first branch 12 has a conducting current, and the sum of the currents of the two first branches 12 is the total current corresponding to the total voltage.

[0040] As the total voltage increases further and reaches the starting voltage of the plurality of third light sources 142 in the second branch 14, all the third light sources 142 in the second branch 14 light up. At this time, the overall color temperature of the light emitting device 10 is a mixed color temperature of the color temperatures of the first light source 122 and the third light source 142. Since the number of the second branch 14 is greater than the number of the first branch 12, as the total voltage continues to increase, the overall color temperature of the light emitting device 10 will be as follows: Figure 1 As shown in the ideal curve in FIG, the color temperature of the third light source 142 gradually increases and shifts toward the color temperature of the third light source 142. Figure 3 As shown in the second section of , the proportion of the second branch 14 in the total current will gradually increase; Figure 3 In the second section shown, the slope of sub-branch A is smaller than the slope of sub-branch B. In the above process, due to the parallel connection of the second light source 124 by the shunt 126 and the voltage division effect of the shunt 126 and the plurality of first light sources 122, the second light source 124 is still not turned on.

[0041] Furthermore, as the total voltage continues to rise, the second light source 124 in the first branch 12 will be turned on, and when the second light source 124 is operating in the linear region, the conduction current of the second light source 124 will increase significantly as the voltage increases. As the second light source 124 is turned on, the overall color temperature of the light-emitting device 10 will slightly shift toward the color temperature of the second light source 124, because the second light source 124 and the first light source 122 usually have the same color temperature, thereby suppressing the overall color temperature from shifting toward the color temperature of the third light source 142. At this time, if Figure 3 As shown in Figure 2, the slope of the A-branch will increase, and correspondingly, the slope of the B-branch will decrease, and Figure 3 The two current proportional curves in enter the third section from the second section. Figure 3 In the third curve of FIG. 1 , the slopes of the A branch and the B branch are the same, that is, as the total voltage and the total current increase, the current ratio of the A branch and the B branch remains unchanged, that is, the ratio between the luminous intensity of the A branch and the luminous intensity of the B branch remains unchanged. Thus, the overall color temperature of the light emitting device 10 will remain stable at a preset value, for example Figure 1 The medium current is in the range of 400 mA to 600 mA, and the overall color temperature of the light emitting device 10 is stabilized at 3000 K as shown by the ideal curve, and the color temperature variation does not exceed 3% in this stage.

[0042] In addition, if the ratio of the first branch 12 to the second branch 14 changes, Figure 1 The ideal curve shown will also change. For example, if the ratio of the first branch 12 to the second branch 14 is adjusted to 1:1, and there are 4 first branches 12 and 4 second branches 14, the slope of the ideal curve in the color temperature rising stage will decrease, that is, as the total current increases, the color temperature change of the light-emitting device 10 slows down. If you want to reach a stable stage at a smaller current, you can increase the number of first branches 12 relative to the second branch 14, or increase the resistance of the shunt 126. However, increasing the resistance will cause the color temperature to start changing at a smaller current. In order to maintain the original setting, it is necessary to increase the number of second light sources 124 in parallel (for example, from 11 first light sources 122 plus 1 second light source 124 in parallel with the shunt 126 to 10 first light sources 122 plus 2 second light sources 124 in parallel with the shunt 126).

[0043] In addition, see Figure 2 , the splitter 126 simultaneously connects the second light sources 124 in the plurality of first branches 12 in parallel; or, see Figure 4 The number of the shunts is multiple, and the multiple shunts are connected in parallel to the second light sources 124 in the multiple first branches 12 in a one-to-one correspondence. The multiple shunts are, for example, Figure 4 The first shunt 121 and the second shunt 123 shown in FIG. 1 may be equivalent to Figure 2The single shunt 126 shown; for example, Figure 2 The resistance of the shunt 126 is 20 ohms. Figure 4 The resistance of the first shunt 121 and the second shunt 123 can be set to 40 ohms respectively, and due to the substantial parallel relationship between the two, they are equivalent to a 20 ohm resistor. Figure 6 or Figure 7 As shown, Figure 2 or Figure 4 The various electrical components shown are arranged on the substrate. Or, due to the limited area of ​​the substrate, in order to save the area occupied by the shunt on the substrate, the following Figure 2 If the area of ​​the substrate allows, or based on the distribution requirements of the diverter 126 and each light source, the following can also be used: Figure 4 The circuit structure shown has multiple shunts.

[0044] Another embodiment of the present invention, see Figure 5 Based on the requirement of symmetrical distribution of some light sources, the light emitting device 10 may include a plurality of shunts, each first branch 12 has a plurality of second light sources 124, and the plurality of shunts are respectively connected in parallel to the plurality of second light sources 124. The plurality of shunts are, for example, Figure 5 The third shunt 125 and the fourth shunt 127 are shown. In this embodiment, each shunt can be connected in parallel with a second light source 124 of multiple first branches 12 at the same time, or can be connected in parallel with only a second light source 124 of one of the first branches 12. The specific configuration of the shunt is not limited to the above-mentioned embodiments, and can be appropriately combined or adjusted according to the specific needs of the visible light-emitting device 10.

[0045] See also Figure 6 and Figure 7 The light emitting device 10 is, for example, a COB (Chip On Board) package product. The diode light emitting elements included in the first light source 122, the second light source 124, and the third light source 142 are all attached to the solid crystal area of ​​the COB substrate. Then, the first fluorescent glue is applied to the diode light emitting elements corresponding to the first light source 122 and the second light source 124, and the second fluorescent glue is applied to all the diode light emitting elements corresponding to the third light source 142, so as to formally form the first light source 122, the second light source 124, and the third light source 142; wherein the diverter 126 can be as follows Figure 6 As shown, it is arranged outside the solid crystal area, or it can be as Figure 7As shown, it is arranged in the solid crystal area, depending on the specific selection of the diverter 126. In other embodiments of the utility model, the first light source 122, the second light source 124, and the third light source 142 can also be arranged on the COB substrate in the form of CSP packaging. Of course, the light emitting device 10 provided by the utility model is not limited to COB type packaging products, but can also be a filament type packaging product, or a combination product of SMD (Surface Mounted Devices) type packaging.

[0046] In addition, it can be understood that the aforementioned embodiments are merely illustrative descriptions of the present invention. On the premise that the technical features do not conflict, are not contradictory, and do not violate the purpose of the present invention, the technical solutions of the various embodiments can be arbitrarily combined and used in combination.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A light emitting device (10), characterized in that: include: a first light source (122); a second light source (124), connected in series with the first light source (122) and forming a first branch (12) with the first light source (122); A splitter connected in parallel with the second light source (124), and the splitter is connected in series with the first light source (122); A third light source (142) is connected in parallel to the first branch (12); the color temperature of the third light source (142) is higher than the color temperature of the first light source (122) and the color temperature of the second light source (124); the color temperature of the first light source (122) is the same as the color temperature of the second light source (124).

2. The lighting device (10) according to claim 1, characterized in that: There are a plurality of third light sources (142), and the plurality of third light sources (142) are connected in series to form a second branch (14), and the second branch (14) is connected in parallel to the first branch (12).

3. The lighting device (10) according to claim 2, characterized in that: There are multiple second branches (14), and the multiple second branches (14) are connected in parallel.

4. The light emitting device (10) according to any one of claims 1 to 3, characterized in that: There are a plurality of the first light sources (122), and the plurality of the first light sources (122) are connected in series and connected in series with at least one of the second light sources (124) to form the first branch (12).

5. The lighting device (10) according to claim 4, characterized in that: The number of the first branches (12) is plural, and the plurality of the first branches (12) are connected in parallel with each other.

6. The lighting device (10) according to claim 5, characterized in that: The splitter simultaneously connects the second light sources (124) in a plurality of the first branches (12) in parallel; Alternatively, there are a plurality of splitters, and the plurality of splitters are connected in parallel to the second light sources (124) in the plurality of first branches (12) in a one-to-one correspondence; Alternatively, there are a plurality of diverters, and the plurality of diverters are respectively connected in parallel to a plurality of second light sources (124) in the first branch (12).

7. The lighting device (10) according to claim 4, characterized in that: The color temperature of the third light source (142) is greater than the color temperature of the first light source (122) and the color temperature of the second light source (124); and the number of the third light sources (142) is greater than the total number of the first light sources (122) and the second light sources (124).

8. The lighting device (10) according to claim 3, characterized in that: There are a plurality of the first light sources (122), and the plurality of the first light sources (122) are connected in series and connected in series with the second light source (124) to form the first branch (12); There are a plurality of the first branches (12), and the plurality of the first branches (12) are connected in parallel with each other; the first branch (12) includes a plurality of the first light sources (122) and one second light source (124); the second branch (14) includes a plurality of the third light sources (142); the number of the third light sources (142) in any one of the second branches (14) is the same as the sum of the number of the first light sources (122) and the second light sources (124) in any one of the first branches (12); The first light source (122), the second light source (124), and the third light source (142) include light emitting diode devices having the same starting voltage.

9. The light emitting device (10) according to any one of claims 1 to 3 or claim 8, characterized in that: The color temperature of the first light source (122) and the color temperature of the second light source (124) are greater than or equal to 1500K and less than or equal to 2100K; the color temperature of the third light source (142) is greater than or equal to 3100K and less than or equal to 3300K.

10. The light emitting device (10) according to any one of claims 1 to 3 or claim 8, characterized in that: As the total current of the light emitting device (10) gradually increases, the first light source (122) lights up first, the third light source (142) lights up second, and the second light source (124) lights up last.

Images