What are the factors that affect the lifespan of LED power supply
1. The impact of practical application environment: high humidity environment, high temperature environment, dusty environment, strong magnetic environment, vibration environment
2. The influence of lighting temperature environment: the internal temperature of the lighting is less than 65 degrees, the outer shell of the lighting is less than 75 degrees, and the power supply temperature is less than 60 degrees
3. The impact of the power grid: Unstable voltage input from the power grid can have an impact on the components of the LED power supply, thereby affecting the service life of the LED driver.
4. The impact of insulation and installation: Proper installation and good insulation of the product will enhance the applicability of LED power supply.
5. The impact of electrolytic capacitors: The sealing part of electrolytic capacitors will leak vaporized electrolyte, which will accelerate with the increase of temperature. It is generally believed that for every 10 ℃ increase in temperature, the leakage rate will double.
Therefore, it can be said that electrolytic capacitors determine the lifespan of power supply devices.
If a high-temperature electrolytic capacitor with a lifespan of 10000 hours and a temperature of 105 degrees is selected, according to the commonly used formula for estimating the lifespan of electrolytic capacitors, which states' for every 10 degrees decrease, the lifespan doubles', then its working lifespan is 20000 hours in a 95 degree environment and 40000 hours in an 85 degree environment.
The normal working life of LED driving power supply depends on the life of the electrolytic capacitor used by the power supply, which in turn depends on the life of the capacitor itself and the working temperature.
The lifespan of the capacitor at a temperature of 65 ℃ can only guarantee about 80000 hours; The lifespan of the capacitor at a temperature of 75 ℃ can only guarantee about 40000 hours; The lifespan of the capacitor at a temperature of 85 ℃ can only guarantee about 20000 hours; The lifespan of the capacitor at a temperature of 95 ℃ can only guarantee about 10000 hours; Based on the above calculation, the lifespan of electrolytic capacitors will be halved for every 10 ℃ increase in temperature.
6. The impact of switch frequency: Most power supplies are equipped with capacitor input rectifier circuits, which can generate surge currents when the power supply is turned on, leading to switch contact fatigue, increased contact resistance, and adsorption problems. In theory, it is believed that during the expected lifespan of a power supply, the switch will be turned on and off approximately 10000 times.
7. The impact of surge current protection resistors and thermal power resistors: To counteract the surge current generated when the power supply is turned on, the design of the power supply usually uses resistors in parallel with SCR and other components.
