A metal film capacitor
is a metal film capacitor directly evaporated on paper as an electrode, that is, a metalized paper capacitor. Since the electrode is a metal film that is evaporated, it is much thinner than aluminum foil. The biggest feature of this kind of capacitor is its self-healing effect. If the voltage is too high and a certain point of the capacitor's internal dielectric is broken down, the short-circuit current will evaporate the metal film where the dielectric is damaged, thereby avoiding a short circuit between the two pole pieces and allowing the capacitor to continue working. Of course, the range of breakdown should not be too large, otherwise the capacitance of the capacitor will be affected. Metal film paper capacitors are usually encapsulated by epoxy resin, so they have good moisture resistance. From a theoretical analysis, there should be no short-circuit failure mode for metal film capacitors, while metal foil capacitors will have many short-circuit failures. Although metal film capacitors have the above-mentioned huge advantages, compared with metal foil capacitors, they also have the following two disadvantages: First, the capacity stability is not as good as foil capacitors. This is because metallized capacitors are prone to loss of capacity in long-term working conditions and After self-healing, the capacity can be reduced. Therefore, if it is used in an oscillation circuit that requires high capacity stability, it is better to choose a metal foil capacitor. Another major disadvantage is the poor ability to withstand large currents. This is because the metalized film layer is much thinner than the metal foil, and the ability to carry large currents is weak. In order to improve this shortcoming of metalized film capacitors, there are currently improved high-current metal film capacitor products in the manufacturing process. Because the resistance of metal film capacitors is more excellent, and also satisfactory in terms of solderability and self-recovery properties, this greatly saves space. Wide application is also the advantage of metal film capacitors, and the price does not represent the quality of a product, so we must pay special attention to this when choosing metal film capacitors.
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