A high reliability LED lamp bead based on zero ohm resistance

Abstract

The present invention proposes a high-reliability LED lamp bead, which adopts a plurality of light-emitting units connected in parallel, each light-emitting unit includes an LED chip and a zero-ohm resistor connected in series. Even if an individual LED chip fails and short-circuits, the zero-ohm resistor will be burned out to form an open circuit, which will not affect the overall luminous effect of the LED lamp bead, thereby improving the reliability and quality indicators of the LED lamp bead and extending the service life of the LED lamp bead.

Description

Technical Field

[0001] The invention belongs to the technical field of LEDs, and in particular to a high-reliability LED lamp bead based on zero-ohm resistance. Background Art

[0002] It is generally believed that the life of LED lamp beads is as long as several decades, but in fact, the reliability of the lamps is not as good as expected, which is closely related to the structural process of LED lamps. Generally, there are a large number of LED light-emitting units involved in lamps, which are connected in series or parallel. The problem is that if one of the parallel lamp beads is short-circuited and damaged, the entire parallel lamp group will not light up. Similarly, if one of the series lamp beads is open-circuited and damaged, the entire series lamp group will not light up. According to reliability theory, even if the MTBF (mean time between failures) of a single LED lamp bead is as long as several decades, a lamp composed of hundreds of lamp beads will fail as long as one lamp bead is damaged, and the MTBF of the lamp is only a few months. In addition, the voltage of the parallel lamp beads is the same, but the forward voltage of each lamp bead is different. The slight voltage difference will cause a large difference in current. The large current accelerates aging, and the small current weakens the luminous intensity, resulting in dark areas, which also seriously damages the quality of the lamp. The reliability and quality of LED lamps are difficult problems that need to be seriously considered. Summary of the invention

[0003] The technical problem solved by the present invention is to provide a high-reliability LED lamp bead, which adopts a plurality of light-emitting units connected in parallel, each light-emitting unit includes an LED chip and a zero-ohm resistor connected in series, thereby improving the reliability and quality index of the LED lamp bead and extending the service life of the LED lamp bead.

[0004] The technical solution to achieve the purpose of the present invention is:

[0005] A high-reliability LED lamp bead based on a zero-ohm resistor includes a plurality of light-emitting units connected in parallel, wherein the light-emitting units include an LED chip and a zero-ohm resistor connected in series, the LED chip and the zero-ohm resistor are connected by gold wires, and the number of light-emitting units meets the following condition: N=Ie / ie+1, wherein N is the number of light-emitting units, Ie is the rated current of the lamp bead, and ie is the rated current of the LED chip.

[0006] Furthermore, in the high-reliability LED lamp bead based on zero-ohm resistance of the present invention, the number of light-emitting units N∈[5,50].

[0007] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0008] 1. The present invention adopts a series structure of LED chips and zero-ohm resistors. Even if individual LED chips fail and short-circuit, the zero-ohm resistor will burn out to form an open circuit, which will not affect the overall luminous effect of the LED lamp beads;

[0009] 2. The light-emitting units of the present invention are connected in parallel, which can improve the reliability and quality index of LED lamp beads;

[0010] 3. The number of chips in the present invention is selected to adopt a redundant structure, which can effectively extend the service life of the LED lamp beads. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is the structure diagram of the LED lamp bead of the present invention;

[0012] Figure 2 It is a schematic diagram of the first internal connection mode of the LED lamp bead of the present invention;

[0013] Figure 3 It is a schematic diagram of the second internal connection method of the LED lamp bead of the present invention.

[0014] Meaning of the reference numerals: 1: positive electrode, 2: negative electrode, 3: gold lead, 4: LED chip, 5: zero ohm resistor, 6: P-type electrode, 7: N-type electrode. DETAILED DESCRIPTION

[0015] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0016] A high reliability LED lamp bead based on zero ohm resistance, such as Figure 1 As shown, it includes a plurality of light-emitting units connected in parallel, and the number of the light-emitting units is at least 2. The light-emitting unit includes an LED chip and a zero-ohm resistor connected in series, and the LED chip and the zero-ohm resistor are connected by gold wires. The number of light-emitting units satisfies: N=Ie / ie+1, where N is the number of light-emitting units, Ie is the rated current of the lamp bead, and ie is the rated current of the LED chip. Preferably, the number of light-emitting units N∈[5,50], and the reliability of the lamp bead is higher when the number of light-emitting units is within this range.

[0017] In this solution, the number of light-emitting units N adopts the redundancy mode of Ie / ie+1, and an extra spare LED chip is reserved. When an individual LED chip fails and opens, the other LED chips can still emit light normally, which can solve the problem that the failure of individual LED chips in parallel light-emitting units causes the lamp beads to fail to emit light normally and reduces the reliability of the lamp beads. When the number of light-emitting units N is large, the distance between the LED chips inside the lamp beads is very small. After the failure of individual LED chips, the lamp beads will not produce obvious dark areas from a macroscopic perspective.

[0018] The light-emitting unit adopts a combination of LED chip in series with zero-ohm resistor. When the LED chip fails and short-circuits, all the current of the lamp bead will flow into the failed LED chip. The current is much larger than the rated current of the LED chip. The current at this time is enough to burn out the zero-ohm resistor connected in series with the LED chip, causing the light-emitting unit to be short-circuited. Then other light-emitting units continue to work normally, and thus the lamp bead can also work normally.

[0019] In addition, in production management, the on-state voltage value of LED chips is accurately measured and sorted, and the voltage difference of each LED chip of the same lamp bead is made less than 20mV.

[0020] Example 1

[0021] A high reliability LED lamp bead based on zero ohm resistance, such as Figure 2 As shown, it includes 6 light-emitting units connected in parallel, each light-emitting unit includes an LED chip and a zero-ohm resistor, and the LED chip and the zero-ohm resistor are connected in series with a gold wire. Gold wires are used to connect the positive electrode of the light-emitting unit and the P-type electrode of the LED chip, the N-type electrode of the LED chip and the zero-ohm resistor, and the zero-ohm resistor and the negative electrode of the light-emitting unit. If a certain LED chip in the lamp bead fails and short-circuits, all the current of the lamp bead will flow into the failed LED chip, and the current is much greater than the rated current of the LED chip. At this time, the current flowing through the light-emitting unit will burn out the zero-ohm resistor connected in series with the LED chip, causing the light-emitting unit to be short-circuited, and then the current of the lamp bead is redistributed to other normal light-emitting units, so that other light-emitting units continue to work normally, and the lamp bead can also work normally.

[0022] Example 2

[0023] A high reliability LED lamp bead based on zero ohm resistance, such as Figure 3As shown, it includes 12 light-emitting units, and the above 12 light-emitting units are divided into two light-emitting groups, each light-emitting group includes 6 light-emitting units, and the 6 light-emitting units in the light-emitting group are connected in parallel, and then the light-emitting groups are connected in parallel. Each light-emitting unit includes an LED chip and a zero-ohm resistor, and the LED chip and the zero-ohm resistor are connected in series with a gold wire. Gold wires are used to connect the positive electrode of the light-emitting unit and the P-type electrode of the LED chip, the N-type electrode of the LED chip and the zero-ohm resistor, and the zero-ohm resistor and the negative electrode of the light-emitting unit. Dividing the 12 light-emitting units into two light-emitting groups and then connecting them in parallel can effectively reduce the length of the lamp bead and reduce the volume of the lamp bead.

[0024] The above descriptions are only some embodiments of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principles of the present invention. These improvements should be regarded as within the protection scope of the present invention.

Claims

1. A high reliability LED lamp bead based on zero ohm resistance, characterized in that: It includes a plurality of light-emitting units connected in parallel, wherein the light-emitting units include an LED chip and a zero-ohm resistor connected in series, the LED chip and the zero-ohm resistor are connected by gold wires, and the number of light-emitting units satisfies the following condition: N=Ie / ie+1, wherein N is the number of light-emitting units, Ie is the rated current of the lamp bead, and ie is the rated current of the LED chip.

2. The high-reliability LED lamp bead based on zero-ohm resistance according to claim 1, characterized in that: The number of the light emitting units N∈[5,50].

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