Metal film capacitor
s are also called film capacitors, and are divided into electrolytic capacitors, paper capacitors, film capacitors, ceramic capacitors, mica capacitors, air capacitors, etc. according to their categories. Metal film capacitors are usually used in places that require a lot of capacitance, such as power supply filtering, and also serve as a power storage function. They also simulate signal connections and are widely used in noisy places, such as power supply noise. next to. Metal film capacitors have many excellent characteristics: non-polarity, high insulation resistance, excellent frequency characteristics (wide frequency response), and low dielectric loss. Based on the above advantages, 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. Its structure is the same as that of paper dielectric capacitors, and the dielectric is polyester or polystyrene. Polyester film capacitors have high dielectric constant, small size, large capacity, and good stability. They are suitable for bypass capacitors. Polystyrene film capacitors have low dielectric loss, high insulation resistance, but large temperature coefficient, and can be used in high-frequency circuits. Among all the plastic film capacitors, polypropylene (PP) capacitors and polystyrene (PS) capacitors have the most significant characteristics. Of course, the prices of these two types of capacitors are relatively high. However, in recent years, in order to improve the sound quality of audio equipment, the parts and materials used have become more and more advanced. Price is not the most important consideration. Therefore, in recent years, the frequency and quantity of PP capacitors and PS capacitors used in audio equipment have also increased. Higher. The films used in metallized film capacitors include polyethylene, polypropylene, polycarbonate, etc. In addition to winding types, there are also laminated types. Capacitors of this type of metallized film have a so-called self-healing action (SelfHealingAction), that is, when the tiny part of the electrode is short-circuited due to the weak electrical boundary, the electrode metal around the short-circuited part will be At that time, the electrostatic energy or short-circuit current carried by the capacitor caused a larger area to melt and evaporate to restore the insulation, so that the capacitor would return to the role of the capacitor.
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