In-depth analysis of LED lighting fixtures

LED packaging companies and LED lighting manufacturers will encounter LED dead lights phenomenon, as a LED engineer how to analyze and solve these problems?

There are two main reasons for LED dead lights:

1) The leakage current of the LED is too large, causing the PN junction to fail, so that the LED light is not bright. This situation generally does not affect the operation of other LED lights.

2) The internal connection lead of the LED lamp is disconnected, causing no current to pass through the LED and generating a dead light. This situation will affect the normal operation of other LED lights.

How to prevent LED dead lights?

Static electricity is a very harmful devil for LED lights. The world's electronic components damaged by static electricity are countless, resulting in tens of millions of dollars in economic losses. Therefore, it is an important task in the electronics industry to prevent static electricity from damaging electronic components. LED packaging and application companies should not be taken lightly. Any problem in one link will cause damage to the LED, making the LED performance deteriorate or even fail. We know that the human body (ESD) static electricity can reach about three kilovolts, which can damage the LED chip . In the LED packaging production line, the grounding resistance of all kinds of equipment meets the requirements. This is also very important. Generally, the grounding resistance is 4 Ohm, in some cases where the requirements are high, the grounding resistance should even reach ≤ 2 ohms.

The human body static electricity is also very harmful to the LED. It should be worn with anti-static clothing when working. It should be equipped with an electrostatic ring. The electrostatic ring should be well grounded. There is an antistatic effect that does not need to be grounded. The antistatic effect is not good. It is recommended not to use the belt. This kind of product, if the staff violates the operating procedures, should receive corresponding warning education, and also play a role in notifying others. The amount of static electricity in the human body is related to the different fabrics worn by people and the physical fitness of each person. It is easy to see the discharge between clothes in the autumn and winter nights. The voltage of this electrostatic discharge is three thousand volts.

Some companies use manual soldering, using 40 watt ordinary soldering iron, the soldering temperature can not be controlled, the soldering iron temperature is above 300-400 °C, too high soldering temperature will also cause dead lights, LED lead expansion coefficient at high temperature is about 150 °C The expansion coefficient is several times higher, and the internal gold wire solder joint will open the solder joint due to excessive thermal expansion and contraction, resulting in a dead light phenomenon.

In response to the above phenomenon, LED packaging manufacturers and LED lighting manufacturers should develop a strict LED standard manual to prevent the occurrence of the online phenomenon in the production process.

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