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Why Is the Constant Current Led Easy to Burn Out?

Feb. 25, 2020


"I used the best LED and constant current driver, why does it still burn out?"-This is a problem our customers encountered in actual design.

Although LEDs have a longer life and higher efficiency than other types of lighting systems, they are also more fragile-especially when used incorrectly in a constant current system. In general, improper wiring, improper heat dissipation, or improper drive use may cause premature failure of LED lighting systems. You need to check that the radiator or cooling system is working properly, that the wiring is correct, and that the system is operating within the rated parameters. Constant current led driver supplier to share with you:

Constant voltage drive is more convenient to operate and can potentially save design costs, but by avoiding possible failures in the constant current system, we may be able to alleviate the problem of premature failure. Although constant current systems are cumbersome to operate, they can extend the life of LEDs if used properly. The reason is that constant current solves the problem of thermal runaway.

Power is equal to current times voltage (P = I x V). One would think that as long as the two variables remain constant, the remaining variables remain the same. If you don't consider the problem of thermal runaway, that's right. When the LED is turned on for a long time or is operated in a warm environment, the forward voltage drop will decrease and it will increase the LED current beyond its rated value. This is a major problem when diodes (LEDs) are used as "loads" in lighting systems.

Constant Current Led Driver Led Driver

Constant Current Led Driver Led Driver

When the LED heats up, the constant current drive will intercept the overcurrent, and the voltage output will also adjust the heating LED to a lower forward voltage drop, so there is no need to worry about the constant current drive will produce damaging overvoltage.

The following suggestions will help you solve problems and extend the life of your lighting system when using a constant current lighting system:

Replace damaged LEDs immediately

Some people will make this mistake. When one or two LEDs burn out or are damaged, they will continue to let the constant current LED lighting system continue to work. In this case, constant current drive will pass the same current through the remaining LEDs, causing them to burn out or fail prematurely. Turn off the power immediately and repair the damaged LED. Constant voltage drives do not have this kind of problem, because they always maintain the same voltage, and their current depends on the current consumption of the (residual) LED.

Connect the lighting system to the output before plugging in the input power

Another suggestion that can help you avoid problems and premature failure is to ensure that the LED lighting system is connected to the driver before connecting the input power to the constant current led driver led driver. If you connect the input power to the driver before connecting the LED, the constant current drive output voltage may reach the highest (or higher) rating of the voltage output window specification (higher than the LED rated voltage), leading to premature failure or possible Burn out the LED immediately when connected. Constant voltage drive still does not have this kind of problem, because their output voltage is fixed, and the current depends on the current on the LED.

Many professionals and hobbyists will first plug the power into the constant current input and then complete the wiring of the LEDs or "test" their lighting strips (by connecting the LEDs or strips to the output)-they may not have Realizing that this has caused damage to the lighting system, and still wondering why the life of the LED is not as long as expected.

Constant current drive troubleshooting:

The readings displayed by the constant current drive voltage output with an open load are likely to float up and down across the entire range of the voltage output window, as the output voltage will constantly change in an attempt to output a fixed current.

Sometimes a normal DC multimeter can be difficult to read because it may show up as an AC voltage instead of a DC voltage, depending on the drive and meter used. And sometimes, the output voltage may be the minimum or maximum value of the voltage output window. In order to obtain a stable reading, you need to add a load to the output to adapt to the voltage output range and meet the requirements of constant current.