Metal film capacitor
s are capacitors in which a metal film is used as an electrode, and plastic films such as polyethylene and polypropylene are overlapped from both ends and then wound into a cylindrical structure. According to the type of plastic film, they are called polyester capacitors (also called Mylar capacitors) and polypropylene capacitors. Metal film capacitors can be classified in the following two ways according to their different media: 1. According to the electrolyte classification. According to the different electrolytes, the metal film capacitors can be divided into the following two types: PETPolyethylene polyester PPPolypropylene polypropylene 2. Classification according to the type of film According to the type of plastic film, it is divided into polyester capacitors (also known as Mylar capacitors) and polypropylene capacitors. Its structure is the same as that of paper dielectric capacitors, and the dielectric is polyester film or local acrylic film. Polyester film capacitors have high dielectric constant, small size, large capacity, and good stability. They are suitable for bypass capacitors, with low dielectric loss, high insulation resistance, but large temperature coefficient, and can be used in high-frequency circuits. Among all the metal film capacitors, polypropylene capacitors and polyester capacitors have the most significant characteristics. Of course, the prices of these two metal film capacitors are relatively high. 3. Classification according to usage mode Metal film capacitors are classified according to usage mode, which can be divided into four categories: general purpose, suppression power electromagnetic interference, pulse and precision; metal film capacitors in circuits powered by AC power, according to function It is divided into motor start-up operation, power factor compensation, etc. The metal film capacitor is a capacitor with excellent performance because of its many excellent characteristics. Its main equivalence are as follows: non-polarity, high insulation resistance, excellent frequency characteristics (wide frequency response), and low dielectric loss. Based on the above advantages, metal film capacitors are widely used in analog circuits. Especially in the signal cross-connection part, capacitors with good frequency characteristics and extremely low dielectric loss must be used to ensure that the signal will not be too distorted when it is transmitted.
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