Talking about the difference between ceramic capacitor and electrolytic capacitor

The ceramic capacitor is a capacitor made of a ceramic material as a medium, coated with a metal film on the surface of the ceramic, and then sintered at a high temperature as an electrode. It is usually used in a high-stability oscillation circuit as a loop, a bypass capacitor, and Pad capacitors. The electrolytic capacitor is a kind of capacitor. The metal foil is a positive electrode, and the oxide film which is in close contact with the positive electrode is a dielectric. The cathode is composed of a conductive material, an electrolyte and other materials. Since the electrolyte is a main part of the cathode, the electrolytic capacitor is obtained. name. At the same time, the electrolytic capacitors are not connected correctly. After understanding their basic structure, it is necessary to see what makes them different.

The ceramic capacitor is a capacitor of a flat structure. Simply speaking, two parallel metal sheets lead two pins, and the capacitor is formed by insulating material in the middle. This structure has a small capacitance, but the capacity is stable and the equivalent inductance is small. The equivalent inductance is an important parameter when a component is used. The positive electrode of the electrolytic capacitor is rolled into a cylinder and then placed in an aluminum casing. This manufacturing method also causes many problems at the same time of large capacity, and one of them is that the equivalent inductance of the electrolytic capacitor is relatively large.

The equivalent inductance of the ceramic capacitor is small, so it can be used in high frequency applications, and the operating frequency can reach more than 100 megabytes, so it is mainly used for high frequency filtering circuits. The typical application is a combination of the two, we can see a lot of power output, using an electrolysis and a ceramic capacitor in parallel, is to let them "high and low" to achieve better filtering results. The equivalent inductance of the electrolytic capacitor is large, which determines that it cannot be used in high frequency applications, because the higher the frequency, the more obvious the influence of the inductance. The large frequency that electrolytic capacitors can be applied is generally around 500KHz, so electrolytic capacitors are suitable for use in low frequency filter circuits.

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