Double-color-temperature LED light source and illuminating lamp

Abstract

The utility model relates to a double color temperature LED light source and an illuminating lamp in the technical field of light emitting illumination, comprising a filament support substrate and a plurality of groups of LED chip strings arranged on the filament support substrate, at least three groups of LED chip strings are arranged, at least two groups of LED chip strings in the at least three groups of LED chip strings are arranged as first chip strings, and at least two groups of LED chip strings are arranged as second chip strings. At least one group of LED chip strings is set as a second chip string, the second chip string is arranged between the two groups of first chip strings, a voltage regulation assembly is arranged in the second chip string, and the forward voltage drop of the first chip strings is higher than that of the second chip string, so that the problem that the forward voltage drop of an existing LED filament is too high when the existing LED filament is driven by different currents is solved. And the problem that the service life of the LED lamp filament is affected due to the fact that the temperature of the middle chip string rises continuously exists.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of light emitting illumination, specifically relates to a double-color temperature LED light source and illuminating lamp. BACKGROUND

[0002] With the rapid development of the LED filament market, the existing LED hard filament light source is mainly small power, and often needs to be connected in parallel with multiple chip strings in a single filament to improve the whole lamp lumen.

[0003] However, the voltage difference of the different chip strings in the filament is small, so that the current in the filament can be best distributed and the current distribution is relatively average only under a relatively appropriate current drive. If the filament is driven under a small current, the chip strings in the middle have basically no current, and the chips are wasted. If the filament is driven under a large current, the junction temperature (Tj) of the filament increases, the temperature inside the filament increases, and the voltage drop of the internal chip strings is still large, which causes the voltage of the chip strings in the middle to be lower than that of the chip strings at both ends, and further causes the current of the chip strings in the middle to increase. The increase in current will increase the junction temperature (Tj), which will eventually lead to a vicious cycle and affect the service life of the LED filament.

[0004] To solve this problem, the utility model patent with publication number CN 219036460 U discloses a high-reliability LED light source, which sets the forward voltage of the second chip string located in the middle of the filament support substrate to be higher than the forward voltage of the first chip string on both sides of the filament support substrate, and combines the principle that the current of the chip string with lower voltage is larger, so that the heat generation of the second chip string is lower than that of the first chip string, so that the temperatures of the first chip string and the second chip string are the same, and the service life of the entire LED filament is not affected by the second chip string.

[0005] However, the voltage difference of the different chip strings in the filament is small, so that the current in the filament can be best distributed and the current distribution is relatively average only under a relatively appropriate current drive. If the filament is driven under a small current, the chip strings in the middle have basically no current, and the chips are wasted. If the filament is driven under a large current, the junction temperature (Tj) of the filament increases, the temperature inside the filament increases, and the voltage drop of the internal chip strings is still large, which causes the voltage of the chip strings in the middle to be lower than that of the chip strings at both ends, and further causes the current of the chip strings in the middle to increase. The increase in current will increase the junction temperature (Tj), which will eventually lead to a vicious cycle and affect the service life of the LED filament. SUMMARY

[0006] The utility model discare the shortcoming among the prior art, provide a kind of double color temperature LED light source and lighting lamp, solve the problem that the service life of LED filament is influenced by the continuously increasing middle chip string temperature under the different current driving of existing LED filament.

[0007] In order to solve the above technical problems, the utility model solves by the following technical schemes:

[0008] A kind of double color temperature LED light source, including filament support base plate, several groups of LED chip strings are arranged on the filament support base plate, several groups of the LED chip strings are connected in parallel, the LED chip string is at least provided with three groups, and at least two groups of LED chip strings in the at least three groups of the LED chip strings are set as first chip string, at least one group of LED chip strings is set as second chip string, the second chip string is arranged between two groups of first chip string, voltage regulating component is arranged in the second chip string, the forward voltage drop of the first chip string is higher than the forward voltage drop of the second chip.

[0009] Optionally, the second chip string further includes several series LED chips, the voltage regulating component is connected in series with one group of LED chip, and the adjacent LED chips are connected by metal wires.

[0010] Optionally, the voltage regulating component is a patch resistor or a current limiting IC.

[0011] Optionally, the resistance of the patch resistor is set to 10Ω-10kΩ.

[0012] Optionally, the current of the current limiting IC is set to 5-30mA.

[0013] Optionally, the first chip string includes several series LED chips, and the adjacent LED chips are connected by metal wires.

[0014] Optionally, both ends of the filament support base plate are provided with electrode pins, and the electrode pins are connected with the first chip string and the second chip string by metal wires respectively.

[0015] Optionally, the first chip string and the second chip string are covered with a glue layer, and the back of the filament support base plate is also covered with a glue layer.

[0016] Optionally, the second chip string is provided with two groups, and the two groups of second chip strings are arranged between two groups of first chip strings.

[0017] A lighting lamp, the lighting lamp includes the double color temperature LED light source of any one of the above.

[0018] Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

[0019] The application can reduce the voltage difference between the LED chip strings at different positions on the filament support substrate through the voltage regulating component, so that the current of each LED chip string is uniformly distributed, and the temperature of each LED chip string is the same, thereby improving the service life. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0021] Figure 1 The structure diagram of the dual-color-temperature LED light source is provided for the first embodiment;

[0022] Figure 2 The front of the filament support substrate of the dual-color-temperature LED light source is provided for the first embodiment;

[0023] Figure 3 The cross-sectional view of the dual-color-temperature LED light source is provided for the first embodiment;

[0024] Figure 4 The structure diagram of the dual-color-temperature LED light source is provided for the second embodiment;

[0025] Figure 5 The structure diagram of the dual-color-temperature LED light source is provided for the third embodiment.

[0026] Reference signs: 1, filament support substrate; 21, first chip string; 22, second chip string; 3, metal wire; 4, electrode pin; 5, glue layer; 6, patch resistor; 7, current limiting IC. DETAILED DESCRIPTION

[0027] The utility model will be further described in detail in combination with the embodiments, and the following embodiments are the explanation of the utility model, and the utility model is not limited to the following embodiments.

[0028] Embodiment one

[0029] As Figure 1As shown, a dual-color temperature LED light source includes a filament support base plate 1, a plurality of groups of LED chip strings arranged on the filament support base plate 1, the plurality of groups of LED chip strings are arranged in parallel, at least three groups of LED chip strings are arranged, and at least two groups of LED chip strings in the at least three groups of LED chip strings are arranged as first chip strings 21, at least one group of LED chip strings is arranged as a second chip string 22, the second chip string 22 is arranged between the two groups of first chip strings 21, and the second chip string 22 is provided with a voltage adjusting component, and the forward voltage drop of the first chip string 21 is higher than the forward voltage drop of the second chip string.

[0030] Among them, the second chip string 22 further includes a plurality of series LED chips, the voltage adjusting component is connected in series with one of the groups of LED chips, the adjacent LED chips are connected through metal wires 3, and the voltage adjusting component and the LED chips are connected through metal wires 3. The first chip string 21 includes a plurality of series LED chips, and the adjacent LED chips are connected through metal wires 3.

[0031] In this embodiment, three groups of LED chip strings are arranged as an example for illustration, specifically, two groups of first chip strings 21 and one group of second chip strings 22 are arranged, and the first chip string 21 is arranged between the two groups of second chip strings 22. Since the LED chip string will emit light and heat when the dual-color temperature LED light source is working, the closer to the center, the higher the temperature of the LED chip string, and the closer to the two sides, the lower the temperature of the LED chip string. Due to the influence of the characteristics of the LED chip, when the temperature is higher, the voltage of the chip is lower, and when the voltage is lower, the current of the LED chip string of this path is higher.

[0032] Therefore, in this embodiment, a voltage adjusting component is connected in series with the second chip string 22, so that even under different current driving, the voltage difference between the LED chip strings at different positions on the filament support base plate 1 can be reduced through the voltage adjusting component, thereby adjusting the uniform distribution of the current of each LED chip string, and through the uniform distribution of the current, the temperature of each LED chip string is the same, thereby improving the service life.

[0033] Specifically, the voltage adjusting component is set to a patch resistor 6 in this embodiment. Since in actual application, the width of the filament support base plate 1, the spacing of the distribution of the LED chip string, the wavelength of the LED chip, and the application environment will all affect the power, therefore the difference between the forward voltage drops of the first chip string 21 and the second chip string 22 will have different proportions, and according to the voltage comparison, the resistance value of the patch resistor 6 is set to 10Ω~10kΩ for best effect through experiments, and through the characteristics that the voltage of the patch resistor 6 will increase with the increase of the current, it is ensured that the voltage of the second chip string 22 is higher than that of the first chip string 21 under large current, so that the current of the second chip string 22 is lower than that of the first chip string 21.

[0034] More specifically, when the current across the dual-color temperature LED light source is less than the current threshold, the forward voltage drop of the first chip string 21 is higher than that of the second chip string 22 under low current conditions. Since the voltage of the surface mount resistor 6 is much smaller than that of the second chip string 22, the current through the first chip string 21 is lower than that through the second chip string 22. However, the difference in current between the first chip string 21 and the second chip string 22 is not significant. As the current across the two ends increases and the light is on for a long time, the voltage of the surface mount resistor 6 increases significantly, and the forward voltage drop of the second chip string 22 will get closer and closer to that of the first chip string 21, and may even exceed it.

[0035] When the current across the dual-color temperature LED light source is equal to the current threshold, the forward voltage drop of the first chip string 21 and the second chip string 22 is the same, that is, the current of the first chip string 21 and the second chip string 22 is the same.

[0036] When the current across the dual-color temperature LED light source exceeds the current threshold, the forward voltage drop of the first chip string 21 is lower than that of the second chip string 22. This means that the current shunted by the first chip string 21 is greater than that shunted by the second chip string 22. As the current increases further, the first chip string 21 receives more current, leading to an increase in the junction temperature and internal temperature of the dual-color temperature LED light source. This causes a greater voltage drop in the second chip string 22. However, the voltage across the chip resistor 6 also increases with the current, thus compensating for the voltage drop in the second chip string 22. This reduces the voltage difference between the second chip string 22 and the first chip string 21, and ensures that the current in each LED chip string is evenly distributed. This even current distribution ensures that the temperature of each LED chip string is the same, thereby improving the filament lifespan.

[0037] This ensures the stability of the second chip string 22 under different current driving conditions, thereby improving the filament lifespan.

[0038] On the other hand, such as Figure 2 and Figure 3 As shown, electrode pins 4 are provided at both ends of the filament support substrate 1, and the electrode pins 4 are connected to the first chip string 21 and the second chip string 22 respectively through metal wires 3. The electrode pins 4 at both ends are pins with opposite electrodes. The first chip string 21 and the second chip string 22 are covered with an adhesive layer 5, and the back of the filament support substrate 1 is also covered with an adhesive layer 5. The adhesive layer 5 can be a fluorescent adhesive made by mixing adhesive and phosphor, and the adhesive can be silicone or epoxy adhesive. The adhesive layer 5 can also be a fluorescent adhesive made by mixing adhesive with other powders, such as silicon dioxide, titanium dioxide, aluminum oxide, carbon powder, etc. When applying the adhesive layer 5, the first chip string 21 and the second chip string 22 need to be completely covered.

[0039] In this embodiment, the filament support substrate 1 can be made of ceramic, sapphire, MCPCB, FPC or other flexible materials; the LED chip can be any one of upright chip, flip chip, vertical chip or CSP; the metal wire 3 can be gold wire, silver wire, alloy wire, copper wire, aluminum wire, etc.

[0040] Example 2

[0041] like Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that in this embodiment, the voltage regulation component is set as current limiting IC7. The current limiting IC7 is an integrated circuit specifically designed to control and limit the current through the load (such as LED, motor, etc.). The current of the current limiting IC7 is set to 5~30mA for the best effect.

[0042] Specifically, by connecting a current-limiting IC7 in series with the second chip string 22, when the current across the dual-color temperature LED light source is less than or equal to the current threshold, the voltage of the first chip string 21 is lower than the voltage of the second chip string 22, meaning the current of the first chip string 21 is greater than the current of the second chip string 22. However, since the current of the second chip string 22 is smaller than the current-limiting current of the current-limiting IC7, the current-limiting IC7 does not work, and the current of the second chip string 22 flows according to the actual current. When the current across the dual-color temperature LED light source is greater than the current threshold, the voltage of the first chip string 21 is lower than that of the second chip string 22, and the current flowing through the second chip string 22 is greater than the current-limiting current of the current-limiting IC7. Therefore, the current-limiting IC7 works, meaning the current of the second chip string 22 can only flow according to the current-limiting IC7.

[0043] Example 3

[0044] like Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that the second chip string 22 in this embodiment is provided in two groups, and both groups of the second chip string 22 are arranged between the two groups of the first chip string 21.

[0045] When the current across the dual-color temperature LED light source is less than the current threshold, the forward voltage drop of the first chip string 21 is higher than that of the second chip string 22 under low current conditions. The voltage of the surface mount resistor 6 is very small relative to the voltage of the second chip string 22. Therefore, the current passing through the first chip string 21 is lower than that passing through the second chip string 22, but the difference in current between the first chip string 21 and the second chip string 22 is not significant. However, as the current across the two ends increases and the light is lit for a long time, the voltage of the surface mount resistor 6 increases significantly, and the forward voltage drop of the second chip string 22 will get closer and closer to that of the first chip string 21, and may even exceed it.

[0046] When the current across the dual-color temperature LED light source is equal to the current threshold, the forward voltage drops of the first chip string 21 and the second chip string 22 are the same, i.e., the currents of the first chip string 21 and the second chip string 22 are the same.

[0047] When the current across the dual-color temperature LED light source is greater than the current threshold, the forward voltage drop of the first chip string 21 is lower than that of the second chip string 22, i.e., the current of the first chip string 21 is greater than that of the second chip string 22, and the current of the first chip string 21 is greater as the current increases. At this time, the junction temperature of the dual-color temperature LED light source increases, the temperature inside also increases, the voltage drop of the second chip string 22 increases, but the voltage of the patch resistor 6 also increases as the current increases, thereby offsetting the voltage drop of the second chip string 22, thereby reducing the voltage difference between the second chip string 22 and the first chip string 21, and adjusting the current of each LED chip string to be uniformly distributed. The uniform distribution of the current can ensure that the temperature of each LED chip string is the same, thereby improving the service life of the filament.

[0048] Embodiment Four

[0049] A lighting lamp, the lighting lamp comprising the dual-color temperature LED light source according to any one of the embodiments one to three, specifically, the structure of the lighting lamp is not limited in the embodiment, only the current can be uniformly distributed under different current driving, so as not to affect the service life of the LED filament.

[0050] The above is only the preferred embodiment of the present application, and is not limited in any form and essence. It should be noted that for ordinary skilled persons in the art, without departing from the method of the present application, some improvements and supplements can be made, which should be considered as the protection range of the present application. For those skilled in the art, without departing from the spirit and scope of the present application, some changes, modifications and equivalent changes can be made by using the above disclosed technical content, which are equivalent embodiments of the present application; at the same time, any equivalent change, modification and evolution of the above-mentioned embodiments according to the essential technology of the present application are still within the scope of the technical scheme of the present application.

Claims

1. A bi-color temperature LED light source, characterized in that, The filament support base plate, a plurality of groups of LED chip strings arranged on the filament support base plate, a plurality of groups of the LED chip strings are arranged in parallel, the LED chip strings are arranged with at least three groups, and at least two groups of the LED chip strings in the at least three groups of the LED chip strings are arranged as first chip strings, at least one group of the LED chip strings is arranged as a second chip string, the second chip string is arranged between the two groups of the first chip strings, the second chip string is arranged with a voltage adjusting component, and a forward voltage drop of the first chip string is higher than a forward voltage drop of the second chip.

2. A bi-color temperature LED light source according to claim 1, characterized in that, The second chip string further includes a plurality of series LED chips, the voltage adjusting component is connected in series with one group of the LED chip strings, adjacent LED chips are connected through metal wires, and the voltage adjusting component and the LED chip are connected through metal wires.

3. A bi-color temperature LED light source according to claim 2, characterized in that, The voltage adjusting component is a patch resistor or a current limiting IC.

4. A bi-color temperature LED light source according to claim 3, characterized in that, The resistance of the patch resistor is set to 10Ω-10kΩ.

5. A bi-color temperature LED light source according to claim 3, characterized in that, The current of the current limiting IC is set to 5-30mA.

6. The dual-color temperature LED light source of claim 1, wherein, The first chip string includes a plurality of series LED chips, and adjacent LED chips are connected through metal wires.

7. A dual color temperature LED light source according to any one of claims 1-6, characterized in that, Both ends of the filament support base plate are provided with electrode pins, and the electrode pins are respectively connected with the first chip string and the second chip string through metal wires.

8. A bi-color temperature LED light source according to claim 7, characterized in that, The first chip string and the second chip string are covered with a glue layer, and the back of the filament support base plate is also covered with a glue layer.

9. A bi-color temperature LED light source according to claim 7, characterized in that, The second chip string is arranged with two groups, and the two groups of the second chip string are arranged between the two groups of the first chip string.

10. An illuminating lamp characterized by comprising: The lighting lamp includes the dual-color temperature LED light source according to any one of claims 1-9.

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