Method for manufacturing aluminum electrolytic capacitor with ultra-long service life special for LED drive circuit

Abstract

The invention discloses a method for manufacturing an aluminum electrolytic capacitor with the ultra-long service life special for an LED drive circuit. Leads are riveted to anode aluminum foil and cathode aluminum foil, a capacitor core packet is formed by isolating electrolytic paper in an isolating and winding mode, vacuum impregnation is carried out through low-impedance electrolyte, and the capacitor core packet is sealed through a sealing rubber plug and an aluminum packaging shell. The manufactured aluminum electrolytic capacitor can be widely applied to a high-frequency switch power source and a computer main board, especially the LED drive circuit, the capacitor is a winding type aluminum capacitor composed of the anode aluminum foil, the cathode aluminum foil, the isolating electrolytic paper, the leads, the sealing rubber plug, the aluminum packaging shell and other components after electrochemical treatment, the anode aluminum coil and the cathode aluminum coil of the capacitor are treated through a traditional electrochemical surface expansion corrosion formation process, then plasma chemical vapor deposition treatment is carried out, porous carbon nano films are formed on the surface of the anode aluminum foil and the surface of the cathode aluminum foil, therefore, the excellent hydration resisting capacity is obtained, and the capacitor has the advantages of being low in impedance and long in service life.

Description

technical field [0001] The invention relates to a method for preparing an aluminum capacitor, in particular to a method for preparing an ultra-long-life aluminum electrolytic capacitor dedicated to an LED drive circuit. Background technique [0002] LED is a new type of light source with an extremely long life, and its life span can reach more than 100,000 hours. High luminous efficiency, the luminous efficiency of high-power LED has surpassed T8 fluorescent tube, so it has a very broad application prospect. In the LED drive circuit, there must be enough capacitance to smooth the rectified output voltage to the allowable range, and also need enough capacitance to maintain the stability of the circuit and the smoothness of the output current. As we all know, only aluminum electrolytic capacitors are the best choice for the most economical bulk capacitors. [0003] As a new type of LED light source with 100,000 hours, the short life of aluminum electrolytic capacitors is its...

AI Technical Summary

Problems solved by technology

[0005] The main reason why aluminum electrolytic capacitors are not suitable for the life of LED lights is that electrolytic capacitors require extremely low ESR values. For example, 25V470uf requires an ESR value below 50mΩ. The simplest and most effective way to increase the water content of the electrolyte is to increase the water content of the electrolyte. The problem is that the "hydration" reaction occurs prematurely, which leads to early failure of the capacitor.

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