Metal thin film filtering capacitor for frequency converter

Abstract

The invention provides a metal thin film filtering capacitor for a frequency converter. The filtering capacitor includes a core assembly which is formed by wrapping at least one group of thin film layer which includes a double face metallization polypropylene thin film or a double face metallization polyester thin film and a medium layer, wherein the double face metallization polypropylene thin film or the double face metallization polyester thin film is provided with a metal layer separately on the upper face and the lower face of the polypropylene thin film or the polyester thin film, and one metal layer is an aluminum metal layer and the other metal layer is a zinc metal layer. The filtering capacitor also includes an encapsulated layer which is wrapped in the peripheral side of the core assembly. The filtering capacitor further includes a pin which is connected to the core assembly and extends beyond the encapsulated layer. According to the invention, the metal thin film filtering capacitor for the frequency converter is characterized by high breakdown electric field intensity, long service life, and excellent self-healing property.

Description

technical field [0001] The invention relates to the field of filters, in particular to a metal film filter capacitor for frequency converters. Background technique [0002] Capacitors, usually referred to as capacitance for their ability to hold charges; capacitors, as the name implies, are "charged containers", which are devices that hold charges. Capacitors are one of the electronic components widely used in electronic equipment and are widely used in circuits. DC blocking, coupling, bypass, filtering, tuning loop, energy conversion, control, etc. [0003] The main function of filter capacitors for inverters is filtering. Theoretically (that is, assuming that the capacitor is a pure capacitor), the larger the capacitor, the smaller the impedance and the higher the passing frequency. But in fact, most of the capacitors exceeding 1μF are electrolytic capacitors, which have a large inductance component, so the impedance will increase when the frequency is high. Sometimes i...

AI Technical Summary

Problems solved by technology

[0004] At present, aluminum electrolytic capacitors are commonly used in inverters. The biggest problem in the use of this electrolytic capacitor is the problem of life, especially under high temperature conditions.

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