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Capacitors can be classified into many types depending on the medium, such as film capacitors, electrolytic capacitors, ceramic capacitors, paper capacitors, and the like. The electrode of the film capacitor is a metal foil, and the metal foil and the plastic film are overlapped and rolled into a cylindrical shape to form a capacitor. What are the characteristics of film capacitors?
Its main characteristics are as follows: no polarity, high insulation resistance, excellent frequency characteristics (wide frequency response), and low dielectric loss. Based on the above advantages, the film capacitor is used in a large amount on an analog circuit.
A conventional film capacitor is produced by winding a metal foil such as aluminum as an electrode and a plastic film, and then winding them together. However, another film capacitor has a manufacturing method called Metallized Film, which is formed by vacuum-depositing a thin layer of metal on the plastic film as an electrode. In this way, the thickness of the electrode foil can be omitted, and the volume per unit capacity of the capacitor can be reduced. Therefore, the film capacitor can be easily formed into a small-sized, large-capacity capacitor.
The film used for the metalized film capacitor is polyethylene, polypropylene, polycarbonate, etc., and has a laminate type in addition to the wound type. Metalized film This type of capacitor has a so-called Self Healing Action, which assumes that the tiny part of the electrode is short-circuited due to the fragile electrical boundary, causing the electrode metal around the short-circuited portion. Due to the electrostatic energy or short-circuit current of the capacitor at that time, a larger area of melting and evaporation is initiated to restore the insulation, so that the capacitor returns to the capacitor again.
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