Novel high-voltage anti-explosion polypropylene film capacitor

Abstract

The invention discloses a novel high-voltage anti-explosion polypropylene film capacitor which comprises an outer shell, a cover plate, a core, copper foil, an anti-explosion plate, rivets, soldering lugs and insulation bases. The core is arranged in the outer shell, an insulation foundation support is arranged at the bottom of the outer shell, the core is clamped in the insulation foundation support, the cover plate is arranged on the upper portion of the outer shell and connected with the outer shell in an edge-turned mode, and the position between the cover plate and the outer shell is coated with sealing materials. The core is formed by metallization polypropylene film in a wound mode, and the metallization polypropylene film is sectional type metallization polypropylene film. The two ends of the core are sprayed with pure zinc, the copper foil is welded to the two ends of the core, the core is connected with the rivets through the copper foil, the anti-explosion plate is arranged between the copper foil and the rivets, the soldering lugs are connected with the rivets, the insulation bases are arranged above the soldering lugs, and the position between the outer shell and the core is filled with vegetable oil. According to the novel high-voltage anti-explosion polypropylene film capacitor, the core formed by the sectional type metallization polypropylene film in the wound mode is adopted, voltage division of the capacitor is achieved, the voltage resistance of the capacitor is accordingly improved, and meanwhile the radiating performance and the anti-explosion performance are good.

Description

technical field [0001] The invention relates to the technical field of electronic components, in particular to a novel high-voltage explosion-proof polypropylene film capacitor. Background technique [0002] At present, the capacitor adopts ordinary film, and zinc-aluminum alloy is evaporated on the polypropylene film to form two plates for storing charges. The breakdown voltage of a normal polypropylene film before evaporation is about 450VAC / μm. After evaporation, slitting and winding, the film is stretched and rubbed, its breakdown voltage drops to a large extent, generally At 65~70VAC / μm. Due to the performance of the polypropylene film, its breakdown voltage can only be 70V / μm, so the voltage range of the capacitor film is limited, staying at 70V / μm, so the 10um base film can only be used to make a rated voltage of about 700V It is impossible to make capacitors with higher rated voltages. For example, when 2100V high voltage is required, the capacitors will fail. If ...

AI Technical Summary

Problems solved by technology

Due to the performance of the polypropylene film, its breakdown voltage can only be 70V / μm, so the voltage range of the capacitor film is limited, staying at 70V / μm, so the 10um base film can only be used to make a rated voltage of about 700V Capacitors with higher rated voltages cannot be made. For example, when 2100V high voltage is required, the capacitor will fail

If you want to make a high-voltage capacitor, you need to use a base film of 15um, 20um or even thicker, which will increase the cost and waste resources.

[0003] In addition, the current capacitor will generate heat during the working process. If the large amount of heat generated in an instant is too late to dissipate, the internal pressure of the capacitor will increase, which will cause the shell to bulge, and even cause fire and explosion.

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