Common causes and solutions for LED lamp damage

- Oct 19, 2018-

Common causes and solutions for LED lamp damage

For LED lighting, there are two main threats affecting its life; one is over-current shock, where the over-current shock is that the current applied to the LED exceeds the maximum rated current in the LED technical data sheet, including overvoltage. Overcurrent shock; the other is overheating damage. These damages can be manifested as immediate failure of the component, or it can occur long after the over-current shock event, shortening the LED operating life.

LED lamp damage

The failure of LED luminaires is due to the failure of the power supply and drive, and the failure of the LED components themselves. Often the damage to the LED power supply and drive comes from the over-current surge (EOS) of the input supply and the open-circuit fault at the load. The over-current shock of the input power supply often causes damage to the driver chip in the drive circuit and breakdown of the passive components such as capacitors. The short-circuit fault at the load end may cause over-current drive of the drive circuit, and the drive circuit may be damaged by short-circuit or Overheating damage caused by short circuit faults.

The failure of the LED component itself

Transient overcurrent event

Transient overcurrent event means that the current flowing through the LED exceeds the maximum rated current in the LED technical data sheet. This may be due to the direct generation of large current or indirect high voltage, such as transient lightning strikes, switching. Transient switching noise of the power supply, overcurrent caused by overvoltage events such as grid fluctuations. These events are transient and have a very short duration. Usually we call them spikes such as "current spikes" and "voltage spikes." Conditions that cause transient overcurrent events include transient overcurrents when the LED is powered up or plugged in.

Electrostatic discharge event

ESD damage is the most common transient overvoltage hazard in the manufacture, transportation and application of highly integrated semiconductor components, while LED lighting systems need to meet the IEC61000-4-2 standard "human electrostatic discharge mode" 8KV contact discharge, Prevents the system from over-current shock failure caused by electrostatic discharge.

In LED lighting, there are different thermal protection requirements depending on the application of the luminaire. There are usually two types, which are respectively to cut off the switch protection when the specified temperature is reached. This protection is usually applied to road traffic signs; When a certain temperature is reached, the protection is activated and the current is driven down. This protection is usually applied to indoor lighting and road lighting.