Why do LED lights flicker after a long time?

Why do LED lights flicker after a long time? This is because after a long time, the LED lamp fails, so it will flash and flash, because the LED lamp also has a service life, and the LED lamp with poor quality has a shorter life and is more prone to failure.

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There are many faults that cause the LED lights to flicker. For example, the failure of the LED lamp beads will also cause the LED lights to flicker. The phenomena of the LED light bead failure include: the LED lights are not on, the LED lights are dimmed, or the LED lights flicker. When the LED lamp bead is burnt out and completely disconnected, the LED lamp cannot form a loop, and the LED lamp does not light up at this time; when the LED lamp bead is damaged and not completely open, the impedance is different when the power is turned on and off, which will cause the LED The light oscillates, so the LED light will flicker.

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There is also the failure of the LED light drive power supply. The failure of the LED light drive power supply will cause the output voltage to be unstable, so it will cause the LED light to flicker. For example, the failure of the large filter capacitor at the output end will cause the output voltage to be unstable after rectification. , or the failure of the LED light driver chip, some resistance welding or failure, etc., may cause the LED light to flicker. After all, components have a service life, especially in order to reduce costs, many businesses use relatively inferior components, such as capacitors, resistors, etc., which will greatly shorten the service life of LED lights.

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If you have a little knowledge of the circuit, when the LED lamp fails, you can remove it and check it. Many faults are relatively simple faults, such as the fault of the LED lamp bead, which can be observed by the naked eye. If a lamp bead is found If there is a black spot, it means that the lamp bead has been burned out. It can be removed from another LED lamp and replaced, or replaced by a diode. It can be short-circuited. This situation is limited to one LED lamp bead, because if it belongs to For LED lights driven by constant voltage, too many short circuits will make the voltage of the LED lights too high and the current will be too large, which will cause the LED lights to burn out.

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