Capacitors with different media have a great effect

With the development of science and technology and the discovery of new materials, in order to meet different needs of use, more and more diverse capacitors are emerging. Capacitors differ mainly in the medium, performance, capacity, structure, environment and environment. The use is also different.

1.Different media

The medium is the substance between the two plates of the capacitor. Most of the polar capacitors use electrolyte as the dielectric material. Usually, the capacitance of the same volume has a large capacitance capacity, and different electrolyte materials and processes have different polar capacitors and the same volume capacity. There are also many non-polar capacitor dielectric materials, most of which use metal oxide film, polyester, etc., due to the reversible or irreversible properties of the medium, the environment with extreme and non-polar capacitance is determined.

2.Different performance

Performance is the requirement of use, and demand is the requirement of use. For example, a metal oxide film capacitor can be filtered in the power supply part of a television set, but if the capacitor capacity and withstand voltage required for filtering are to be achieved, the place where the metal oxide film capacitor occupies is large, and the size of the television set is therefore large. Too large, so as a filter can only use a polar capacitor, the positive pole must be connected to the high potential end, the negative pole must be connected to the low potential end.

3.Different structures

In principle, in the case of disregarding the discharge, it is possible to use a capacitor of any shape in the environment. Commonly used ceramic capacitors are round, thin film capacitors are flat and square, monolithic capacitors are circular, etc., of course, invisible, here invisible refers to distributed capacitance, for distributed capacitance in high frequency and intermediate frequency devices It must not be ignored.

4.Use environment and use

Because of its internal material and structure, the capacity of polar capacitors (such as aluminum electrolysis) can be made very large, but its high frequency characteristics are not good, so it is suitable for power supply filtering and other occasions. The non-polar capacitor has small volume and good high frequency characteristics, but it is not suitable for large capacity, such as ceramic capacitor, monolithic capacitor, CBB capacitor, etc. The ceramic capacitor is generally used in high frequency filtering and oscillating circuits. . The ceramic capacitor is a capacitor in which a ceramic material is used as a meson and a silver layer is burned on the surface as an electrode. Magnetic capacitors have stable performance, low loss and low leakage, which are suitable for high frequency and high voltage circuits.