Views: 2 Author: Site Editor Publish Time: 2020-01-03 Origin: http://www.ruimingzm.com/cn/new/new-51-610.html
At present, the light sources of solar street lights are basically led light sources. Such street lights are also called solar led street lights. However, in the process of use, we often encounter LEDs that do not light up. This is the dead light phenomenon of solar led street lights.
There are generally two causes of dead lights. One is that the excessive leakage current of solar led street lights causes the PN junction to fail, causing local dead lights, and the entire lamp work is not affected. The other is that the internal connection leads of solar led street lights are disconnected, causing LEDs. A dead lamp is generated when no current passes, causing the entire lamp to malfunction. So how to avoid this phenomenon?
First, prevent static electricity
Static electricity is a kind of devil that is extremely harmful to solar led street lights. Any problem in any link will cause damage to the LED, make the LED performance worse or even fail.
We know that the static electricity of the human body (ESD) can reach about three thousand volts, which can break down the LED chip. In the LED packaging production line, a scientific and standardized grounding design must be designed. Generally, the grounding resistance is 4 ohms. The ground resistance must even reach ≤2 ohms.
Second, try to use automatic welding equipment
If manual soldering is used, the welding temperature must be strictly controlled. This is because manual soldering is used. If an ordinary soldering iron is used, the soldering iron temperature is above 300-400 ° C. Excessive soldering temperature will also cause dead lights.
The expansion coefficient of solar LED street light leads is several times higher than the expansion coefficient at about 150 ° C. The internal gold wire solder joints will pull the solder joints apart due to excessive thermal expansion and contraction, causing dead lights.