Analysis on Causes of Dead Lamps in LED Lighting Fixtures
LED packaging companies and LED lighting manufacturers will experience the phenomenon of LED lights, LED energy saving lamp manufacturers, LED bulb, why this phenomenon? LED bulb, LED bulb manufacturers, as LED engineers how to analyze and solve these problems?Here to talk about the reasons for LED lighting dead lights mainly in the following two points:1) LED leakage current is too large cause PN junction failure, so that the LED light point does not shine, this situation generally does not affect the other LED lights work
2) LED lamp internal connection lead disconnected, resulting in no LED current through the dead lights, this situation will affect the normal operation of other LED lights,How to prevent LED dead lights?Static electricity on the LED lamp is a great harm to the devil, the world because of electrostatic damage to the numerous electronic components, resulting in tens of millions of dollars in economic losses. So to prevent electrostatic damage to electronic components, the electronics industry is a very important work, LED packaging, application of the enterprise must not be taken lightly. Any part of a problem, will cause damage to the LED, LED performance deterioration or even failure. We know that the human body (ESD) static electricity can reach about three thousand volts, enough to LED chip breakdown damage in the LED packaging production line, the grounding resistance of various types of equipment to meet the requirements, which is also very important, the general requirements of the grounding resistance of 4 Ohms, and some require high ground resistance to reach even ≤ 2 ohms.Electrostatic charge on the LED damage is also great, work wear anti-static clothing, with static ring, electrostatic ring should be grounded, there is a need not ground electrostatic ring anti-static effect is not good, it is recommended not to use with The product, if the staff violates the operating rules, should receive the appropriate warning education, but also play a role in informing others. The body with the number of static, and people wear different fabrics and clothes, and everyone’s physical, autumn and winter night we undress it is easy to see the phenomenon of discharge between clothes, there are three thousand volts of electrostatic discharge voltage.Some companies use manual welding, the use of 40-watt ordinary soldering iron, soldering temperature can not be controlled, the soldering iron temperature above 300-400 ℃, high soldering temperature can cause dead lights, LED leads at high temperatures than the expansion coefficient of about 150 ℃ Expansion coefficient several times higher, the internal gold wire solder joints will be too large because of thermal expansion and contraction of the welding point will be opened, resulting in death lights phenomenon.In view of the above phenomenon, LED packaging manufacturers and manufacturers of LED lighting applications LED lights, should develop strict LED standard manual, in the production process to prevent the occurrence of on-line phenomenon.