How can film capacitors be optimized?

Film capacitors can be optimized through diferent materials and manufacturing methods. Capacitors are all unique; their fundamentals, the manufacturing processes, advantages and even technology trends are worth highlighting. There are diferent grades and applications critical to considering before choosing the best option.

What is a film capacitor?

A dielectric wound or vapour-deposited between two metal foils ensures high capacitance. Low internal resistance (ESR), low inductance (ESL) as well as high current carrying capacity and self-healing capability characterise this type of capacitor. Film capacitors usually consist of two aluminium foil electrodes with plastic films as dielectric.

How do metallised film capacitors work?

Unlike film capacitors, which use aluminium foils as electrodes, the electrodes of metallised film capacitors consist of a thin metal layer (about 0.03 microns thick) deposited on the dielectric film in a vacuum. Metallised capacitors are connected by a metal spraying process and by welding the leads to the sprayed ends.

How is an aluminum can film capacitor made?

The process of making an aluminum (Al) can film capacitor is similar except the round capacitor is not hard pressed; instead it is left round (Figure 11). Then, depending on whether the Al can is oil-filled or dry-filled, the capacitor goes through a process to place the bound capacitor inside the Al shell and fill with oil or resin.

What are the advantages of film capacitors?

These capacitors come with very specific advantages including non-polarity, a high insulation resistance, low dielectric losses and self-healing capability. Film capacitors can be optimized through diferent materials and manufacturing methods.

Are film capacitors better than metallised capacitors?

Typical advantages that relatively large film capacitors have over smaller metallised capacitors are their higher insulation resistance, better capacitance stability and good current carrying capacity. High voltage and good pulse handling capability are further features of these capacitors.