Introduction to power supply Life: LED chip and power supply are installed together, with narrow space and poor heat dissipation. How to ensure the quality and life of LED power supply should be considered before design, so as to avoid the failure of LED power supply quickly. It can be said that the life of LED power supply is the key to restricting the development of LED.
This is a comprehensive problem that needs system design and consideration.
We believe that the performance that affects the life of LED power supply includes environmental characteristics, components and power supply, and has the following aspects: 1. The impact of actual application environment: high humidity environment, high temperature environment, dusty environment, strong magnetic environment, vibration environment 2. Influence of lighting temperature environment: the internal temperature of the lighting is less than 65 degrees, the housing of the lighting is less than 75 degrees, and the temperature of the power supply is less than 60 degrees. 3. Influence of the power supply grid: the voltage input of the unstable power grid will impact the components of the LED power supply, thus affecting the service life pulse of LED drive.
4, the impact of insulation and installation: The correct installation of the product and good insulation will enhance the application of LED power supply.
5. Influence of electrolytic capacitor: the sealing part of electrolytic capacitor will leak gasified electrolyte, which will accelerate with the increase of temperature. It is generally believed that every 10 ℃ rise in temperature, the leakage speed will be increased to 2 times.
Therefore, it can be said that the electrolytic capacitor determines the life of the power supply device.
If a high-temperature electrolytic capacitor with a service life of 105 hours and a service life of 10000 degrees is selected, the company 'doubles the service life for every 10 degrees of reduction' according to the estimated service life of the electrolytic capacitor ', then its working life is 20000 hours in 95 degree environment and 40000 hours in 85 degree environment.
The normal working life of the LED driving power supply depends on the life of the electrolytic capacitor used by the power supply, and the life of the electrolytic capacitor depends on the life of the capacitor itself and the working temperature.
The service life at the capacitance temperature of 65℃ can only be guaranteed for about 80 thousand hours;
The life of the capacitor at 75℃ can only be guaranteed for about 40 thousand hours;
The service life at the capacitance temperature of 85℃ can only be guaranteed for about 20 thousand hours;
The life of the capacitor at 95℃ can only be guaranteed for about 10 thousand hours;
From the above calculation: electrolytic capacitor temperature rise every 10 ℃, life will be halved.
6. Influence of switching times: most power supplies are equipped with rectifier circuits of capacitor input type. When the power supply is connected, surge current will be generated, resulting in fatigue of switching contacts, causes problems such as increased contact resistance and adsorption.
Theoretically, during the expected life of the power supply, the number of on-off switches is about 10000.
7. Impact of impulse current protection resistor and thermal power resistor: in order to resist the impulse current generated when the power source is connected, the power supply is usually designed to use the resistor in parallel with components such as SCR.
When the power source is connected, the peak power is up to dozens to hundreds of times of the rated value, resulting in resistance thermal fatigue and open circuit.
Thermal fatigue will also occur in thermal power resistors under the same conditions.
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