During the life period, some LED tube lights appear problem, such as a broken lamp, droop, far from labeling theory as long service life.
And how to improve reliability of the LED products are the problems of the industry.
It closely related to reliability issues of LED devices.
This article through to the analysis of the failure of LED devices, introduce a few kinds of the LED chip inside, bonding, LED use, LED the typical failure mechanism of welding, etc.
Bring to this kind of widespread application of
LED spotlights, large projects, the early failure of lamps and lanterns does exist!
Some canister light premature failure reason: 1, of the quality problem of itself of lamps and lanterns, the level of cover are: quality of chips;
Structural design is unreasonable;
The radiator performance is unqualified;
Drive power quality issues, etc.
5 and improper use, including maintenance errors, etc.
We do not have the right to use of lamps and lanterns, characterized by, too frequently switch lamps and lanterns, cause many times heat bilges cold shrink, the strength of the material was damaged.
Or the unknown error when installation construction, such as wet flooding caused by fault, and so on and so forth.
Concrete analysis: chip defect failure LED to positive pressure drop (
Vf)
Increased.
Which is caused by the between the chip and its negative metallized layer cracking.
Reason is caused by before deposition metallization, tarnished oxidation layer, or poorly controlled water, lead to the oxidation of metallized layer and a poor adhesion between layers.
The failure belongs to the chip itself process deficiency in the process, has nothing to do with the encapsulation process.
LED chip and the cathode metal domain crack morphology of bonding bad cause LED open bonding process is an important steps LED encapsulation, poor bonding process is easy to cause the chip damage, bonding wire damage, bonding wire bonding strength is not enough and chips or pin of fault, the fault and the bonding state of the machine itself, bonding machine parameter Settings, proficiency of operating personnel and so on.
LED the gold key and bad lead to improper design of LED chips encapsulation structure components have open InGaN, AlInGaP and ZnSe semiconductor materials, these materials often are thinner, more fragile than Si chip.
If packaging design is undeserved, cause is internal residual stress, the existence of stress may result in the crack of the chip device, such as function degradation of reliability problems.
LED burned after flow if the LED device of the current more than the device itself to withstand extreme, burning device.
Large current sources are: external forward voltage is too large;
The LED characteristics degradation;
Which produces a cooling device hot rush.
LED the bonding wire over-current heat fusing, chip to avoid overheating after cracking encounter, the service life of the lamps and lanterns of goods not board will be on your own a good screening high quality lamps and lanterns, at the same time in the later maintenance.
1, controls the good selection of link: (
1)
Pay attention to the chip quality of lamps and lanterns.
Low chip is not ideal, is a direct impact on the
LED downlight etc shorten the actual life of lamps and lanterns!
Such chips easily occurred in the process of lamps and lanterns use these problems such as poor adhesion and corrosion, damage to the LED chip and parts, lead to the whole lamp reported loss in advance.
And the sound of floating series LED tube lights are at no cost to use the Cree (
CREE）
The chip, the quality guaranteed.
LED tube light, sound chip floating shares (
2)
Focus on driving power supply quality, prevention of lamps and lanterns burned after flow.
In many cases, the LED lamps and lanterns appear problem, there is a lot of failure may be because the driver.
As mentioned above, if the LED device of the current more than the device itself to withstand extreme, burning device.
And sound floating series LED spotlights, driving power source is a well beyond this level, driven by constant current mode, even with a high current through the LED, also don't have to worry about load short circuit burn out the power supply.
Furthermore, the driving power supply high temperature resistant, is 105 ℃ from electrolytic electrolytic (
Can work continuously in the temperature of 105 ℃, 8000 hours)
, the life expectancy of 4 times of that of the normal power supply.
No matter which kind of lighting environment, for the LED tube light, etc. The use of LED lighting lamps and lanterns is a long-term investment.
In knowing this article talked about the LED failure mechanism, on the basis of the selection period, do a good job, and later maintenance in place, can guarantee the service life of lamps and lanterns, greatly cut maintenance replacement frequency as far as possible, reduce subsequent repair cost of the project.
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