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Metallized film capacitors are commonly used in places where much capacity is required, such as power supply filtering, as well as the role of power storage functions. They also simulate signal connections and are widely used in noisy places, such as power supply noise. . Metallized film capacitors have many excellent features: no polarity, high insulation resistance, excellent frequency characteristics, and low dielectric loss. Because of these advantages, film capacitors are used in large quantities on analog circuits.
The part where the signal is connected must use a capacitor with good frequency characteristics and extremely low dielectric loss to ensure that the signal is not distorted when transmitted. The structure is the same as the paper dielectric, and the medium is polyester or polystyrene. Polyester film capacitor, high dielectric constant, small size, large capacity, good stability, suitable for bypass capacitors. Polystyrene film capacitors, low dielectric loss, high insulation resistance, large temperature coefficient, can be used in high frequency circuits.
Among all the film capacitors, the characteristics of the polypropylene capacitor and the polystyrene capacitor are remarkable, and the unit price is also relatively high. In recent years, in order to improve the quality of sound, the audio equipment used is getting higher and higher, and the unit price is not an important consideration. Therefore, the frequency and quantity of polypropylene capacitors and polystyrene capacitors used in audio equipment are also increasing.
The film used for the metallized film capacitor is polyethylene, polypropylene, polycarbonate, etc., and has a laminate type in addition to the wound type. Metallized film This type of capacitor has a so-called self-recovery effect, that is, if the tiny part of the electrode is short-circuited due to the fragile electrical boundary, the electrode metal around the short-circuited part will be brought by the capacitor at that time. The static or short-circuit current causes a larger area of melting and evaporation to restore the insulation, causing the capacitor to return to the capacitor again.
The use of metallized film capacitors is becoming more and more extensive, and it is important to understand its characteristics and applications. If there is a problem with the film capacitor technology, we will try our best to solve it for you. Sincerely serve every customer who comes to consult, and the quality of capacitors is our basic commitment.