Two factors that affect the life of LED lamp heads
People used to sleep very early, because the outside is very dark. And now it is completely another scene, the night is bright, this is the credit of LED. At this time, some people think: How long is the life of the LED lamp head? In fact, the life of the LED lamp head is affected by these two aspects, let's take a look at it. 1. The effect of transient overcurrent on the service life of LED lamp head: Transient overcurrent refers to the current flowing through the high-power LED lamp beyond the rated current in the high-power LED lamp technical data manual, which may be due to the large current directly The generation may also be indirectly generated by high voltage, such as transient lightning strikes, transient switching noise of switching power supplies, power grids and other overvoltages caused by overvoltage events. These things are transient and have a very short duration. Usually we call them spikes, such as “current spikes” and “voltage spikes.” The situation of transient overcurrents also includes the powering up of high-power LED lamps. Or transient overcurrent when hot plugging. The failure mode of high-power LED lamps subjected to electrical shock is not fixed, but usually leads to damage to the welding line, which is usually caused by a large transient overcurrent. In addition to causing the weld line to burn out, it may incur other local damage near the weld line.
2, the impact of electrostatic discharge on the life of LED lamp head: Electrostatic discharge (ESD) damage is a transient over-voltage hazard common in the manufacture, transportation and application of highly integrated semiconductor devices, while high-power LED lighting system must It meets the "human body electrostatic discharge form" 8kV contact discharge of IEC61000-4-2 specification to avoid over-electric shock failure that may occur in the system during electrostatic discharge. LEDPN junction array performance will appear to be reduced or damaged. The internal failure of the chip of the high-power LED lamp incurred by the ESD discharge channel may be only partially damaged by the function, and in severe cases, the high-power LED lamp may be damaged forever. Regarding the design of high-power LED luminaires where nearly 80% of energy is converted into heat, thermal management and overheating maintenance are a challenge. Both theory and theory have proven that the performance and longevity of high-power LED luminaires are closely related to the PN junction operating temperature of high-power LED luminaires. When the junction temperature of the high-power LED lamp chip increases by 10 °C, the luminous flux will be attenuated by 1%, and the life of the high-power LED lamp will be reduced by 50%.