The main failures of the LED device itself are as follows:
(1) Transient overcurrent events
A transient overcurrent event is when the current flowing through the LED exceeds the maximum rated current in the LED technical data sheet. This may be due to a large current directly generated or indirectly generated by a high voltage, such as a transient lightning strike or a switching power supply. Over-current caused by over-voltage events such as state switching noise and grid fluctuations. These events are transient and have a very short duration. Usually we call them spikes such as "current spikes" and "voltage spikes." The transient overcurrent event also includes the LED being powered on or the transient overcurrent during hot plugging.
(2) Electrostatic discharge event
Electrostatic discharge (ESD) damage is one of the most common transient overvoltage hazards in the manufacture, transportation and application of highly integrated semiconductor devices, while LED lighting systems must meet the IEC61000-4-2 standard "human body electrostatic discharge". 8kV contact discharge to prevent over-current shock failure of the system during electrostatic discharge. The performance of the LED PN junction array will be reduced or damaged, and the internal failure of the LED chip caused by the ESD event discharge path may be only a partial function damage, and if it is serious, it may cause permanent damage to the LED.
Thermal management and fault overheat protection are a challenge for LED lighting designs where nearly 80% of energy is converted to heat. Both theory and practice have demonstrated that the performance and lifetime of LEDs are closely related to the operating temperature of the PN junction of the LED. When the junction temperature in the LED chip rises by 10 °C, the luminous flux will be attenuated by 1%, and the lifetime of the LED will be reduced by 5%.
LED strips are generally components that operate under DC low voltage conditions. If burned out, there may be the following:
1. Is there any direct communication? If the high voltage is on, if not, please continue down;
2. The power supply of the LED light bar is abnormal; the voltage or current output of the power supply exceeds the rated standard;
3. After the LED is made into a light bar, the heat accumulation cannot be transmitted to the outside world for a long time. Check if the heat sink is abnormal or if the heat sink is hot enough.
4, LED lamp beads are abnormal (this point can be identified).
5, static electricity (depending on the procedure and phenomenon of lamp bead damage, is a string or a grain, or no law).