A metallized polypropylene film fixed capacitor for suppressing electromagnetic power interference

Abstract

The invention discloses a metalized polypropylene film fixed capacitor for suppressing electromagnetic power interference, comprising a capacitor, a shell, pins, and resin. The capacitor is arranged inside the shell. The resin fills the gap between the shell and the capacitor. One pin is welded to each of the two ends of the capacitor, and the pins extend to the outside of the shell. The capacitor is formed by taking a polypropylene film as a medium, depositing zinc and aluminum on the film by means of vacuum evaporation as electrodes, and winding the film. The resin is prepared from epoxy resin, poly-1-butene resin, modified sericite powder, and starch. The metalized polypropylene film fixed capacitor for suppressing electromagnetic power interference of the invention can withstand overvoltage shock, has excellent flame-retardant property, and is widely applied to cross-line power supplies and other anti-jamming occasions.

Description

technical field [0001] The invention relates to the field of capacitors, in particular to a fixed capacitor for suppressing electromagnetic power interference by a metallized polypropylene film. Background technique [0002] Film capacitors use metal foil as an electrode, which is stacked with plastic films such as polyethylene, polypropylene, polystyrene or polycarbonate from both ends, and wound into a cylindrical capacitor; in all Among the plastic film capacitors, the characteristics of polypropylene (PP) capacitors are the most significant. Capacitors made of polypropylene film have the advantages of low heat shrinkage, stable performance, high temperature resistance, high pressure resistance, and prevention of breakdown. The use range of the prepared capacitors is getting wider and wider. The capacitor core is the heart of the capacitor. Therefore, the material of the capacitor manufacturing core must have a polymer film that can withstand high frequency, high tempera...

AI Technical Summary

Problems solved by technology

However, when the existing polypropylene film capacitors are used under high-frequency or high-pulse conditions, the pulse current passing through the capacitor will cause the capacitor itself to heat up and the temperature will rise, resulting in problems such as increased self-healing points, reduced withstand voltage, and shortened life. After that, it is easy to age, and the working performance is reduced, and the existing metallized polypropylene film has not strong anti-interference performance for electromagnetic power supply, which greatly affects the performance of the capacitor

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