A pulse metallized polypropylene film capacitor

Abstract

The invention discloses a pulse metallic polypropylene film capacitor. The pulse metallic polypropylene film capacitor comprises a metal cylinder, a capacitor core, gold spraying layers, an upper insulation cover and a lower insulation cover, wherein the upper insulation cover and the lower insulation cover are fixedly connected by an explosion-prevention plate, a protection lead is arranged between the upper insulation cover and the explosion-prevention plate, an annular explosion-prevention gasket is arranged at each of the upper part and the lower part of the lower insulation cover, an impregnant is arranged in a gap between the metal cylinder and the lower insulation cover, the capacitor core is arranged in the metal cylinder, the gold spraying layers are arranged at the top end and the bottom end of the capacitor core, the capacitor core comprises a polypropylene film, the polypropylene film is evaporated with a metal layer in a high vacuum environment, and the metal layer comprises a wave-shaped double-sided metallic ZnAl layer, a first thickening layer and a second thickening layer. The pulse metallic polypropylene film capacitor has the advantages of excellent performance and high safety coefficient, and the capability of standing ripple current is high.

Description

technical field [0001] The invention relates to the field of electronic components, in particular to a pulse metallized polypropylene film capacitor. Background technique [0002] Capacitors are one of the electronic components widely used in electronic equipment, and are widely used in DC blocking, coupling, bypass, filtering, tuning loops, energy conversion, control, etc. in circuits. Biaxially oriented polypropylene film for capacitors has high mechanical and electrical properties. Compared with capacitors made of ordinary films, capacitors made of polypropylene films have low thermal shrinkage, stable performance, high temperature resistance, High voltage resistance, breakdown prevention and other significant advantages make capacitors made of polypropylene film more and more widely used. The capacitor core of the metallized polypropylene film is tightly wound, and the impregnating agent used cannot completely penetrate the capacitor core, but only penetrates into the i...

AI Technical Summary

Problems solved by technology

However, the capacitor of this utility model is provided with a thickened aluminum layer at the edge of the aluminum layer, and the coating material on the end face of the capacitor core is usually pure zinc. The compatibility of the two materials is poor, the adhesion is not strong, and the ability to withstand the impact of the discharge current is limited. Large loss, large equivalent series resistance, and poor self-healing ability

The notification number CN102496460B discloses a method for injecting a polyisobutylene impregnating agent into a metallized polypropylene film capacitor. The metallized polypropylene film capacitor includes a capacitor core, a metal shell, a lead terminal, an upper insulating cover and a lower insulating cover, The capacitor core is accommodated in the metal shell, the upper insulating cover and the lower insulating cover are combined to accommodate the metal shell, and the injection method includes the following steps: impregnating polyisobutylene with a molecular weight of less than 1000 The impregnating agent is injected into the metallized polypropylene film capacitor, and the temperature should be kept above 75°C during the whole process from pretreatment to injection into the metallized polypropylene film capacitor. It has better anti-oxidation, anti-aging, air and water absorption properties, and the injection temperature is kept above 75°C. If the temperature is too high, polyisobutylene will degrade or depolymerize, resulting in a decrease in average molecular weight. The swelling rate of propylene film can reach 12.5% ​​at 80°C, which is not conducive to the work of capacitors under heavy working conditions

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