How to prevent the dead light of LED explosion-proof light?
LED packaging companies and LED explosion-proof lamp manufacturers will encounter the phenomenon of LED dead lights. As an 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 lamp does not light up. This situation generally does not affect the work of other LED lamps.
2) The internal connection lead of the LED lamp is disconnected, resulting in no current passing through the LED and a dead lamp, which will affect the normal operation of other LED lamps.
How to prevent LED dead lights?
Static electricity is a great danger to LED lamps, because static electricity damages countless electronic components, resulting in economic losses of tens of millions of dollars.
Therefore, preventing static electricity from damaging electronic components is a very important job in the electronics industry. Enterprises in LED packaging and application must not take it lightly.
Any problem in any link will cause damage to the LED, making the LED performance worse or even invalid.
We know that the static electricity of the human body (ESD) can reach about 3,000 volts, which is enough to damage the LED chip. In the LED packaging production line, it is also very important whether the grounding resistance of various equipment meets the requirements. Generally, the grounding resistance is required to be 4 Ohm, and in some occasions with high requirements, the grounding resistance should even reach ≤ 2 ohms.
Some companies use manual soldering and use a 40-watt ordinary soldering iron. The soldering temperature cannot be controlled. The soldering iron temperature is above 300-400 °C. Too high soldering temperature will also cause dead lights. The expansion coefficient is several times higher, and the internal gold wire solder joints will pull the solder joints apart due to excessive thermal expansion and contraction, resulting in a dead lamp phenomenon.
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