The Lifetime and Reliability of led driver vs power supply
The LED is a device that includes a single PN junction and has conductivity on one side. The LED will only emit light when current is applied forward. Because LED lights work at low voltage, the led screen power supply needs to properly manage the load and effectively provide the required low voltage power to the LED.
The street light power supply rectifies commercial AC power into DC power, and converts the rectified DC power into DC power of a predetermined magnitude. Usually, the led street light power supply fails before the LED reaches the end of its life, so the advantages of the LED’s life cannot be fully utilized.
As mentioned above, the led power supply china is the most important component that determines the performance of the lamp. led power supply china are particularly prone to overheating. The driving circuit usually includes a filter, a rectifier and a power factor corrector (PFC), which powers the large-capacity energy storage device and a separate power conversion circuit to drive the LED. Rectifiers, such as full diode bridges and transformers, are usually used to convert power and drive LEDs or other loads. By allowing a higher ripple voltage on the capacitor, more energy storage potential of the capacitor can be used to generate light at the LED.
However, electrolytic capacitors are generally the least reliable components in the drive circuit. Electrolytic capacitors are prone to failure, especially when modern LED lighting systems are configured to provide more and more light output, the operating temperature of the lamp rises and then begins to function. The life of the driving circuit expires before the LED stops emitting light or the brightness decreases. The typical nominal lifetime of these components is usually less than 25,000 hours, while the lifetime of the LED itself may be as long as 50,000-100,000 hours.
Therefore, if the driver circuit can be improved to significantly reduce the output ripple, there is no need to install an electrolytic capacitor on the primary side, and finally achieve the effect of extending the service life of LED lighting products. However, if the storage capacitor is a ceramic capacitor or a film capacitor, its operating voltage range will limit the intermediate bus voltage, or its footprint may be large to provide a larger voltage range. If it has a larger coverage area, the capacitor will increase the cost of the cheap led power supply.