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Aluminum electrolytic capacitor knowledge


Aluminum electrolytic capacitor * life
The first thing to be clear, aluminum electrolytic capacitor will be bad, just a matter of time.There are many reasons affecting the service life of capacitance, overvoltage, reverse voltage, high temperature, rapid charge and discharge, etc., under the condition of normal use, the greatest impact is the temperature, because the higher the temperature the faster the volatilization of the electrolyte loss.It is important to note here is not referring to the temperature of the environment or surface temperature, is refers to the operating temperature of the aluminum foil.Vendors will often capacitor life and test temperature at capacitor ontology.
Because of capacitance working temperature 10 ℃ per increased life expectancy by half, so do not think that 2000 hours service life of aluminum electrolytic capacitor is better than 1000 hours, should pay attention to confirm the lifetime test temperatures.Each vendor has a temperature, and the calculation formula of life, when designing capacity compared to the actual data to calculate.Need to know is to improve the service life of aluminum electrolytic capacitor, the first to lower working temperature, on the PCB away from heat source, the second to consider using the highest working temperature high capacitance, of course the price will be higher.


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