What are the factors that affect the life of LED power supply

1. The influence of the actual application environment: high humidity environment, high temperature environment, dusty environment, strong magnetic environment, vibration environment.

2. The influence of the lighting temperature environment: the interior temperature of the lighting is less than 65 degrees, the lighting shell is less than 75 degrees, and the power supply temperature is less than 60 degrees.

3. The influence of the power supply grid: the voltage input of the unstable grid will have an impact on the components of the LED power supply, thus affecting the service life of the LED driver.

4. Influence of insulation and installation: The correct installation and good insulation of the product will enhance the application force of the LED power supply.

5. Influence of electrolytic capacitors: The gasified electrolyte will leak from the sealing part of electrolytic capacitors. This phenomenon will accelerate with the increase of temperature. It is generally believed that for every 10°C increase in temperature, the leakage rate will increase to 2 times.

Therefore, it can be said that the electrolytic capacitor determines the life of the power supply installation.

If you choose a high-temperature electrolytic capacitor with a life span of 10,000 hours at 105 degrees, according to the popular electrolytic capacitor life budget formula "every 10 degrees lowers, the life is doubled", then its working life is 20,000 hours in a 95-degree environment, and at 85 degrees The working life in the environment is 40,000 hours.

The normal working life of the LED drive power depends on the life of the electrolytic capacitor used in the power supply, and the life of the electrolytic capacitor depends on the life of the capacitor itself and the working temperature.

The life of the capacitor at 65℃ can only be guaranteed about 80,000 hours; when the capacitor temperature is 75℃, the life can only be guaranteed about 40,000 hours; when the capacitor temperature is 85℃, the life can only be guaranteed about 20,000 hours; when the capacitor temperature is 95℃ The life of the electrolytic capacitor can only be guaranteed for about 10,000 hours; from the above calculation: every time the temperature of the electrolytic capacitor rises by 10 °C, the life will be halved.

6. Influence of switching times: Most power supplies are equipped with a capacitor input type rectifier circuit. When the power supply is connected, a surge current will be generated, which will lead to fatigue of the switch contacts, and cause problems such as increased contact resistance and adsorption. Theoretically, during the expected life of the power supply, the switch is turned on and off about 10,000 times. LED drive power

7. Influence of inrush current maintenance resistance and thermal power resistance: In order to counteract the inrush current generated when the power supply is connected, the design of the power supply usually uses the resistance and SCR and other components in parallel. microwave induction power supply

When the power supply is turned on, the peak value of the power is as high as tens to hundreds of times of the rated value, resulting in thermal fatigue of the resistance and open circuit. Thermistor power resistors under the same conditions also suffer from thermal fatigue.