What is a thin film capacitor? What is its function?
There are many types of capacitors depending on the medium, such as electrolyte capacitors, film capacitors, ceramic capacitors, paper capacitors, mica capacitors, air capacitors, supercapacitors, etc.
Among them, electrolytic capacitors and film capacitors are the most frequently used in audio equipment. This article mainly introduces what is a thin film capacitor, including its structure, function, characteristics, and some basic knowledge.
What is the structure of thin film capacitors?
Thin film capacitors are capacitors constructed by using metal foil as electrodes, overlapping it with plastic films such as polyethylene, polypropylene, polystyrene, or polycarbonate from both ends, and winding it into a cylindrical shape. And according to the type of plastic film, they are respectively called polyethylene capacitors, Mylar capacitors, polypropylene capacitors, PP capacitors, polystyrene capacitors, PS capacitors, and polycarbonate capacitors.
The following picture shows a typical schematic diagram of a thin film capacitor.
What is the working principle of thin film capacitors?
The working principle of thin film capacitors is the same as that of general capacitors, both of which store electrical energy by storing charges on electrodes. They are usually used together with inductors to form LC oscillation circuits. The working principle of capacitors is that charges move under force in an electric field. When there is a medium between conductors, it hinders the movement of charges and causes them to accumulate on the conductors, resulting in the accumulation and storage of charges.
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