Method for preventing short-circuit failure of high-voltage aluminum-electrolyzing capacitor for switching power supply

Abstract

The invention discloses a method for preventing the short-circuit failure of a high-voltage aluminum-electrolyzing capacitor for a switching power supply, which comprises an optimizing step for an aging working procedure and a step for improving the flash-fire voltage of an electrolyte, wherein the optimizing step for the aging working procedure comprises the following substeps of: in the aging process of a product, aging by adopting a segmented voltage-raising mode, prolonging the aging time step by step after entering a high-voltage stage, and raising the highest aging voltage to be 1.5 times of the working voltage of the capacitor to improve the strength of continuously restoring a dielectric film by the electrolyte; and the step for improving the flash-fire voltage of the electrolyte comprises the following substeps of: adopting a non-water-system electrolyte to decrease the concentration of hydroxyl ions and reduce the generation of oxygen-ion discharge. By optimizing an aging process, the insulating performance of the dielectric film is improved, and the pressure-resisting characteristic of the product is improved; by optimizing electrolyte components, the flash-fire voltage of the electrolyte is improved, and flash-fire breakdown is prevented from occurring when the voltage is excessive; and by optimizing electrolytic paper, the short circuit of the product due to the breakage of the electrolytic paper is prevented.

Description

technical field [0001] The invention relates to a production process of a high-voltage aluminum electrolytic capacitor for a switching power supply, in particular to a method for preventing short-circuit failure of the high-voltage aluminum electrolytic capacitor for a switching power supply. Background technique [0002] Aluminum electrolytic capacitors are an indispensable part of the filter components that make up switching power supplies, so their performance and stability are critical to the operating characteristics of the entire switching power supply. In addition to the rated voltage of the power supply, the peak signal voltage of electromagnetic interference (EMI) will be superimposed on the aluminum electrolytic capacitor for filtering. The short-circuit failure of the capacitor caused by the discharge breakdown of the pin-nail joint will cause the failure of the power switch and terminate the use of the electrical appliance. Contents of the invention [0003] I...

AI Technical Summary

Problems solved by technology

In addition to the rated voltage of the power supply, the peak signal voltage of electromagnetic interference (EMI) will be superimposed on the aluminum electrolytic capacitor for filtering. The short-circuit failure of the capacitor caused by the discharge breakdown of the pin-nail joint will cause the failure of the power switch and terminate the use of the electrical appliance