Anyone who has been in contact with capacitor
s knows that capacitors are divided into polarized and non-polarized ones. Axial film capacitors belong to metalized film capacitors, which are all electrodeless. And some of the aluminum electrolytic capacitors
are polarized and some are non-polarized. We want to talk about the polarities of axial film capacitors and aluminum electrolytic capacitors. Naturally, we have to analyze why the capacitors have polarity. The polarity of the polarized aluminum electrolytic capacitor is due to its structure. A polar aluminum electrolytic capacitor is composed of aluminum foil as the positive electrode and electrolyte as the negative electrode to form the two poles of the aluminum electrolytic capacitor. A layer of aluminum oxide film produced on the aluminum foil as the positive electrode is used as the dielectric of the aluminum electrolytic capacitor. It is precisely because of this structure that the aluminum electrolytic capacitor with this structure has polarity. When an aluminum electrolytic capacitor with such a structure is connected in a positive way, the aluminum oxide film as a dielectric will remain stable due to electrochemical reactions, and when it is connected in reverse, the aluminum oxide film will become thinner, making the capacitor easy to be damaged by breakdown. This is also the reason for distinguishing aluminum electrolytic capacitors with this structure. Therefore, when using polar aluminum electrolytic capacitors, you must pay attention to the positive and negative poles of the capacitor to ensure the normal and safe operation of the capacitor and even the circuit. However, axial film capacitors and some aluminum electrolytic capacitors that do not have the above-mentioned structure are non-polar, so there is no need to pay attention to polarity when using such capacitors.
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