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Film Capacitors

890334025031CS application field and working principle

Film capacitors, also known as plastic capacitors, are capacitors that use plastic films as their electrodes. Compared to ordinary ceramic capacitors, film capacitors typically have lower leakage and leakage current, higher capacitance stability, and higher voltage resistance. Thanks to their unique characteristics, film capacitors are widely used in communications, consumer electronics, automotive electronics, military, aerospace, and other industries.

Application field

Film capacitors are widely used in various fields. The most common applications are in high-frequency circuits, where their high insulation resistance and reliable performance are required. Moreover, they are also widely used in DC-DC converters, resonant circuits, passenger cars, etc. In addition to the general-purpose film capacitors, there are also many special-purpose film capacitors, such as audio frequency compensation capacitors, automatic machine oscillator capacitors, etc., which are widely used in specific applications.

Working principle

The working principle of film capacitors is relatively simple. The plates of the capacitors are made of the naturally occurring plastic film material, which is then wound into a cylindrical shape. The two plates are separated by a small plastic dielectric, which is what creates the capacitance. When faces of the two plates are charged with the same polarity, an electric field is created between them. This electric field attracts the charges of opposite polarities and the film capacitor stores energy in the the form of static electric charges.

Thus, film capacitors are useful for a variety of applications because of their durability and long-term reliability. As technology advances, the benefits of film capacitors become more and more appreciated and their application fields continue to increase.

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