Do you know why aluminum electrolytic capacitors fail?

The basic structure of the universal aluminum electrolytic capacitor is the structure of the foil type inverted wire type. The anodic oxidation is aluminum metal material foil. The material is the air oxide film Al2O3 of the valve metal material produced on the surface of the anodic oxidation metal material foil by photocatalysis. The negative electrode is the working electrolyte solution absorbed by the porous structure electrolytic paper.

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What are the reasons that affect the life of aluminum electrolytic capacitor?

The service life of aluminum electrolytic capacitor is related to the working environment of the capacitor. If a capacitance of - 40~105 ℃ and 5000 hours, the so-called 5000 hours means that the service life is 5000H under the working environment of 105 ℃. When the temperature of the working environment is reduced by 10 degrees, the service life is doubled.

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What is the capacitance error of aluminum electrolytic capacitor?

The capacity of aluminum electrolytic capacitor is determined by the anode foil. The specific capacity and area of the anode foil are two important parameters to control the capacity of the electrolytic capacitor. The anode foil is formed by the corrosion of pure aluminum light foil. During the corrosion process, chemicals constantly form large and small holes in the pure aluminum light foil

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Production process of aluminum electrolytic capacitor

Aluminum foil is the main material of aluminum electrolytic capacitor. Set aluminum foil as anode. After being electrified in the electrolyte, an oxide film (Al2O3) will be formed on the surface of aluminum foil. The function of this oxide film is dielectric. The role of etching is to expand the surface area of aluminum foil. Etching is an electrochemical process of applying AC or DC current in chloride solution.

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How to judge the quality of aluminum electrolytic capacitor

Short-circuit the two pins of the capacitor with a pointer multimeter to discharge, and connect the black probe of the multimeter to the positive pole of the electrolytic capacitor. The red probe is connected to the negative pole (for the pointer multimeter, the probe is adjusted when measuring with the digital multimeter). In normal conditions, the probe should first swing in the direction of small resistance, and then gradually return to infinity.

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What role does the capacitor play in the power supply?

Filtering is a very important part of capacitance. It is used in almost all power circuits. Theoretically (assuming that the capacitance is pure capacitance), the larger the capacitance, the smaller the impedance, and the higher the passing frequency. But in fact, most of the capacitors that exceed 1uF are electrolytic capacitors with large inductance components, so the impedance will increase when the frequency is high.

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