High-capacity metallized polyester film direct current capacitor

Abstract

The invention discloses a high-capacity metallized polyester film direct current capacitor, which includes a high-temperature-resistant and flame-retardant shell, two wires and a capacitor core. The capacitor core is packaged in the high-temperature-resistant and flame-retardant shell; the capacitor core is formed by winding of a two-sided metallized film which is used as a dielectric and an electrode; the two-sided metallized film includes a polyester film and a metal zinc layer which is respectively evaporated on upper and lower surfaces of the polyester film; each wire uses a tin-coated copper-clad steel wire; and the high-temperature-resistant and flame-retardant shell adopts a high-temperature-resistant ABS plastic. With the above method, the capacitor has the characteristics of large capacity, excellent electrical performance, good reliability, high temperature resistance, small volume and good self-healing performance.

Description

technical field [0001] The invention relates to the field of electronic components, in particular to a large-capacity metallized polyester film DC capacitor. Background technique [0002] Metallized film capacitor is to evaporate a layer of metal film on the surface of polyester film instead of metal foil as an electrode, because the thickness of the metallized film layer is much smaller than the thickness of the metal foil, so the volume after winding is also smaller than that of the metal foil capacitor. Much smaller in size. The biggest advantage of metallized film capacitors is the "self-healing" characteristic. The so-called self-healing characteristic is that if the film medium has a defect at a certain point and a breakdown short circuit occurs under the action of overvoltage, the metallization layer at the breakdown point can be melted and evaporated instantly under the action of an arc to form a small metal-free area. , so that the two pole pieces of the capaci...

AI Technical Summary

Problems solved by technology

Although metallized film capacitors have the above-mentioned huge advantages, they also have two disadvantages compared with metal foil capacitors: the capacity stability is not as good as that of foil capacitors and the ability to withstand large currents is poor. Studies have shown that the use of double-sided metallized films Doing electrodes can avoid the above disadvantages

Images