The light source of solar street lamps is basically using led light source. This kind of street light is also called solar led street light. However, in the process of use, we often encounter the situation that the LED is not bright. This is the dead light phenomenon of solar led street light.
How to prevent solar led lights from dying
There are two reasons for the death of the lamp. One is that the leakage current of the solar led street lamp is too large, causing the local dead light caused by the PN junction failure, and the whole lamp work is not affected. Second, the internal connection lead of the solar led street lamp is disconnected, resulting in LED No current is passed through and a dead light is generated, causing the whole lamp to not work properly. So how to avoid this phenomenon?
First, prevent static electricity
Static electricity is a very harmful devil for solar led street lights. 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, a scientific and standardized grounding design must be designed. Generally, the grounding resistance is required to be 4 ohms. The grounding resistance should even reach ≤ 2 ohms.
Second, try to use automatic welding equipment
If manual soldering is used, the soldering temperature must be strictly controlled. This is because manual soldering is used. If a normal soldering iron is used, the soldering iron temperature is above 300-400 °C. Excessive soldering temperature can also cause dead lights.
The solar led street light lead has a coefficient of expansion several times higher than the expansion coefficient at about 150 ° C. The internal gold wire solder joint will open the solder joint due to excessive thermal expansion and contraction, resulting in a dead light phenomenon.