A multi-color temperature COB light source

Abstract

The invention discloses a multi-color temperature COB light source, which relates to the technical field of LED light source manufacturing, including a mirror substrate, a mirror area and an electrode line area are provided on the mirror substrate, high color temperature positive and negative electrode lines, intermediate color temperature positive and negative electrode lines and low color temperature positive and negative electrode lines are provided on the electrode line area, A units are provided on the mirror area, 12m LED chips are provided in each unit, the LED chips are fixed on the mirror area, each unit is filled with fluorescent glue, adjacent units use fluorescent glue of different color temperatures, and the fluorescent glue of different color temperatures includes high color temperature fluorescent glue, intermediate color temperature fluorescent glue and low color temperature fluorescent glue, the LED chips in each unit are connected by bonding wires to form an LED chip group, and the positive and negative poles of the LED chip groups in different color temperature units are respectively connected to the positive and negative electrode lines of the corresponding color temperatures; a dam is provided outside the mirror area. It has the advantages of consistent brightness of each color temperature, high current resistance, no need for dimming circuit, low cost, etc.

Description

Technical Field

[0001] The invention relates to the technical field of LED light source manufacturing, in particular to a multi-color temperature COB light source. Background Art

[0002] LEDs are classified by packaging form into Lamp-LED, TOP-LED, Side-LED, High-Power-LED, SMD-LED, Flip Chip-LED, COB LED, etc. COB LED packaging technology is the mainstream technical solution for LED general lighting industry that is currently recognized by the domestic and foreign industries. The LED general lighting industry around the world is striving to find a cost-effective production solution.

[0003] White light LEDs can be divided into three categories according to their color temperature range: low color temperature (below 4000K), intermediate color temperature (4000K-5000K), and high color temperature (above 5000K).

[0004] COB integrated light source, i.e. chip on board, is to adhere the bare chip to the interconnection substrate with conductive or non-conductive adhesive, and then perform wire bonding to achieve its electrical connection. It has been widely used in commercial lighting and other fields because it is easier to achieve dimming and color adjustment, anti-glare, high brightness, etc., and can well solve the problems of color difference and heat dissipation.

[0005] At present, there are mainly the following solutions to achieve multiple color temperatures:

[0006] 1. Single-color temperature COB with dimming circuit. The adjustable color temperature range of this solution is narrow, such as 2700K-3000K, which cannot meet people's demand for rich light colors;

[0007] 2. Dual color temperature COB with dimming circuit, color temperature adjustment is achieved by adjusting the current of different color temperature units of COB. This solution has a wide adjustable color temperature range, such as: 2700K-6700K, but the brightness under different color temperatures cannot be guaranteed to be consistent, and the dimming circuit is complex, and the application cost is high;

[0008] Existing multi-color temperature COBs generally adopt a design of shared positive pole and separated negative pole. When multiple circuits are lit at the same time, the current flowing through the positive circuit is large, which easily forms heat accumulation. When the light source is lit for a long time, the brightness of the light source is reduced, and even the light source fails. Summary of the invention

[0009] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a multi-color temperature COB light source. The present invention can achieve consistent brightness at each color temperature, can withstand large currents, and does not require a dimming circuit.

[0010] The present invention adopts the following technical solutions to solve the above technical problems

[0011] A multi-color temperature COB light source according to the present invention includes a mirror substrate,

[0012] The mirror substrate is provided with a mirror area and an electrode line area.

[0013] The electrode line area is equipped with high color temperature positive and negative electrode lines, medium color temperature positive and negative electrode lines, and low color temperature positive and negative electrode lines.

[0014] A units are arranged on the mirror area, and the A units include at least one high color temperature unit, one low color temperature unit and one intermediate color temperature unit. There are 12m LED chips in each unit, and the LED chips are fixed on the mirror area. Each unit is filled with fluorescent glue, and adjacent units use fluorescent glues of different color temperatures. The fluorescent glues of different color temperatures include high color temperature fluorescent glue, intermediate color temperature fluorescent glue and low color temperature fluorescent glue. The LED chips in each unit are connected by bonding wires to form an LED chip group. The positive and negative poles of the LED chip group in the high color temperature unit are respectively connected to the positive and negative electrode wires of the high color temperature, the positive and negative poles of the LED chip group in the intermediate color temperature unit are respectively connected to the positive and negative electrode wires of the intermediate color temperature, and the positive and negative poles of the LED chip group in the low color temperature unit are respectively connected to the positive and negative electrode wires of the low color temperature; wherein m is an integer greater than 0, and A is an integer greater than 2;

[0015] A dam is provided outside the mirror area, so that the mirror area is enclosed in the dam, and the electrode line area is also in the dam; the distance from the dam to the edge of the mirror substrate is greater than or equal to 0.1 mm.

[0016] As a further optimization scheme of a multi-color temperature COB light source described in the present invention, an electrode pad is also provided on the mirror substrate, and the electrode pad includes high color temperature positive and negative electrodes, intermediate color temperature positive and negative electrodes, and low color temperature positive and negative electrodes. The high color temperature positive and negative electrodes are respectively connected to the high color temperature positive and negative electrode lines, the intermediate color temperature positive and negative electrodes are respectively connected to the intermediate color temperature positive and negative electrode lines, and the low color temperature positive and negative electrodes are respectively connected to the low color temperature positive and negative electrode lines.

[0017] As a further optimization solution for a multi-color temperature COB light source described in the present invention, the positive and negative poles of the LED chip group are connected to the positive and negative electrode wires through bonding wires, and the fluorescent glue covers the electrode wire area and the bonding wires.

[0018] As a further optimization solution of the multi-color temperature COB light source described in the present invention, the mirror substrate is a mirror aluminum substrate.

[0019] As a further optimization solution for the multi-color temperature COB light source described in the present invention, the high color temperature positive and negative electrode lines, the intermediate color temperature positive and negative electrode lines, and the low color temperature positive and negative electrode lines on the electrode line area are all arc-shaped.

[0020] As a further optimization solution of the multi-color temperature COB light source described in the present invention, the dam surrounds the mirror area in the dam with the center of the mirror area as the center of the circle.

[0021] As a further optimization solution of the multi-color temperature COB light source described in the present invention, the dam is circular.

[0022] As a further optimization solution of the multi-color temperature COB light source described in the present invention, the distance between two adjacent LED chips in each unit is equal.

[0023] As a further optimization solution of the multi-color temperature COB light source described in the present invention, the mirror substrate is a square mirror aluminum substrate with a thickness of 1.0 mm and a reflectivity of 98%.

[0024] As a further optimization solution of the multi-color temperature COB light source described in the present invention, the LED chip is fixed on the mirror area by a die-bonding adhesive.

[0025] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0026] (1) Different color temperature units are arranged at intervals, the light output is more uniform, and the lamp design is simpler and more convenient;

[0027] (2) The positive and negative electrode circuits of different color temperature units are completely independent. When all color temperature units are lit at the same time, the current is evenly distributed, which can withstand larger currents and achieve higher brightness of the light source. When each color temperature is lit separately, the brightness can also be completely consistent.

[0028] (3) No dimming circuit is required, and a wide color temperature range can be achieved by selecting different color temperature unit combinations, and the manufacturing cost of the lamp is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is the front view of the present invention.

[0030] Explanation of the accompanying drawings: 1-mirror aluminum substrate, 2-dam, 3-LED chip, 4-bonding wire, 5-fluorescent glue, 6-low color temperature positive electrode pad, 7-intermediate color temperature positive electrode pad, 8-high color temperature positive electrode pad, 9-low color temperature negative electrode pad, 10-intermediate color temperature negative electrode pad, 11-high color temperature negative electrode pad. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings:

[0032] like Figure 1As shown, this embodiment provides a multi-color temperature COB light source, which includes a COB light source mirror aluminum substrate 1, a dam 2, first to nth LED chips 3, bonding wires 4, and fluorescent glue 5; the mirror aluminum substrate is provided with a low color temperature positive electrode pad 6, a low color temperature negative electrode pad 9, an intermediate color temperature positive electrode pad 7, an intermediate color temperature negative electrode pad 10, a high color temperature positive electrode pad 8, and a high color temperature negative electrode pad 11; the mirror aluminum substrate is provided with a dam, the dam has a circular shape, and the interior is divided into five units, the LED chips are evenly distributed in each unit, and the LED chips are connected by bonding wires to form an LED chip group; the positive electrode of each LED chip group is connected to the positive electrode line area of ​​the corresponding color temperature through a bonding wire; the negative electrode is connected to the negative electrode line area of ​​the corresponding color temperature through a bonding wire; the fluorescent glue is filled into the dam and covers the LED chip and the electrode wire.

[0033] This embodiment provides a multi-color temperature COB light source packaging method, which specifically includes the following steps:

[0034] Step 1: Fix the 1st to nth LED chips on the mirror aluminum at equal intervals through the bonding adhesive, and put the mirror aluminum substrate with LED chips into a constant temperature box to cure the bonding adhesive; the curing temperature is 150°C and the curing time is 120 minutes;

[0035] Step 2: Divide the 1st to nth LED chips into 10 groups of LED chips, numbered 1 to 10 groups from top to bottom, each group contains n / 10 chips, use bonding wires to connect the LED chips in each group, and use bonding wires to connect the positive electrodes of groups 1, 2, 9, and 10 to the low color temperature positive electrode line area, and the negative electrodes to the low color temperature negative electrode line area; connect the positive electrodes of groups 3, 4, 7, and 8 to the intermediate color temperature positive electrode line area, and the negative electrodes to the intermediate color temperature negative electrode line area; connect the positive electrodes of groups 5 and 6 to the high color temperature positive electrode line area, and the negative electrodes to the high color temperature negative electrode line area;

[0036] Step 3: Use dam glue to surround Figure 1 The dam shown encloses all LED chips and electrode lines within the dam;

[0037] The dam is numbered from top to bottom as A, B, C, D, and E. The mirror aluminum substrate with the dam is placed in a constant temperature box to cure the dam. The curing temperature is 130°C and the curing time is 30 minutes.

[0038] Step 4: Fill low color temperature fluorescent glue in the A and E dams, fill medium color temperature fluorescent glue in the B and D dams, and fill high color temperature fluorescent glue in the C dam; and use the photoelectric parameter tester to test, and put it into the constant temperature box after passing the test, and cure the fluorescent glue to obtain the finished COB light source. The fluorescent glue is cured in sections. The first section is cured at 100°C and the curing time is 30 minutes; the second section is cured at 130°C and the curing time is 60 minutes; the third section is cured at 150°C and the curing time is 180 minutes.

[0039] Step 5: Use the photoelectric parameter tester to test the finished COB light source again, and keep the finished COB light source that passes the test.

[0040] The above description is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A multi-color temperature COB light source, characterized in that: Including mirror substrate, The mirror substrate is provided with a mirror area and an electrode line area. The electrode line area is equipped with high color temperature positive and negative electrode lines, medium color temperature positive and negative electrode lines, and low color temperature positive and negative electrode lines. A units are arranged on the mirror area, and the A units include at least one high color temperature unit, one low color temperature unit and one intermediate color temperature unit. There are 12m LED chips in each unit, and the LED chips are fixed on the mirror area. Each unit is filled with fluorescent glue, and adjacent units use fluorescent glues of different color temperatures. The fluorescent glues of different color temperatures include high color temperature fluorescent glue, intermediate color temperature fluorescent glue and low color temperature fluorescent glue. The LED chips in each unit are connected by bonding wires to form an LED chip group. The positive and negative poles of the LED chip group in the high color temperature unit are respectively connected to the positive and negative electrode wires of the high color temperature, the positive and negative poles of the LED chip group in the intermediate color temperature unit are respectively connected to the positive and negative electrode wires of the intermediate color temperature, and the positive and negative poles of the LED chip group in the low color temperature unit are respectively connected to the positive and negative electrode wires of the low color temperature; wherein m is an integer greater than 0, and A is an integer greater than 2; A dam is provided outside the mirror area, so that the mirror area is enclosed in the dam, and the electrode line area is also in the dam; the distance from the dam to the edge of the mirror substrate is greater than or equal to 0.1 mm.

2. The multi-color temperature COB light source according to claim 1, characterized in that: Electrode pads are also provided on the mirror substrate, and the electrode pads include high color temperature positive and negative electrodes, intermediate color temperature positive and negative electrodes, and low color temperature positive and negative electrodes. The high color temperature positive and negative electrodes are respectively connected to the high color temperature positive and negative electrode lines, the intermediate color temperature positive and negative electrodes are respectively connected to the intermediate color temperature positive and negative electrode lines, and the low color temperature positive and negative electrodes are respectively connected to the low color temperature positive and negative electrode lines.

3. The multi-color temperature COB light source according to claim 1, characterized in that: The positive and negative poles of the LED chip group are connected to the positive and negative electrode wires through bonding wires, and the fluorescent glue covers the electrode wire area and the bonding wires.

4. The multi-color temperature COB light source according to claim 1, characterized in that: The mirror substrate is a mirror aluminum substrate.

5. The multi-color temperature COB light source according to claim 1, characterized in that: The high color temperature positive and negative electrode lines, the intermediate color temperature positive and negative electrode lines, and the low color temperature positive and negative electrode lines on the electrode line area are all arc-shaped.

6. The multi-color temperature COB light source according to claim 1, characterized in that: The dam surrounds the mirror area in the dam with the center of the mirror area as the center of the circle.

7. The multi-color temperature COB light source according to claim 1, characterized in that: The dam is circular.

8. The multi-color temperature COB light source according to claim 1, characterized in that: The distance between two adjacent LED chips in each unit is equal.

9. The multi-color temperature COB light source according to claim 1, characterized in that: The mirror substrate is a square mirror aluminum substrate with a thickness of 1.0 mm and a reflectivity of 98%.

10. The multi-color temperature COB light source according to claim 1, characterized in that: The LED chip is fixed on the mirror area by using a crystal bonding adhesive.

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