Two categories of film capacitors

Film capacitors are electronic components, which are used in many household appliances and have a wide range of applications. Film capacitors have gradually replaced aluminum electrolytic capacitors.

A film capacitor is a capacitor in which metal foil is used as an electrode, and plastic films such as polyethylene, polypropylene, polystyrene or polycarbonate are overlapped from both ends and then wound into a cylindrical structure. The working principle of a film capacitor is the same as that of a general capacitor. It stores electric energy by storing charge on the electrode. It is usually used together with an inductor to form an LC oscillation circuit. The working principle of a capacitor is that the charge moves in an electric field. There is a medium in between, which hinders the movement of charges and causes the charges to accumulate on the conductor, resulting in the accumulation of charges.

Film capacitors can be divided into two categories: DC film capacitors and AC film capacitors: DC film capacitors refer to film capacitors that work in circuits powered by a DC power supply. They can be divided into general types, suppression of electromagnetic interference from power sources, pulse types and precision Class four; AC film capacitors refer to film capacitors that work in circuits powered by AC power, and are classified into motor start-up operation and power factor compensation according to functions.

Film capacitors are widely used because of their extremely high insulation resistance, wide frequency response, and non-polarity. Therefore, film capacitors are often used in circuits such as integrated circuit boards, analog circuits, and so on. Especially the performance of signal cross-connection is very superior. Compared with other media, the film capacitor has small dielectric loss and wide frequency response, which can ensure that the signal will not change during transmission. In order to meet people's requirements for audio quality and improve sound quality, the current audio equipment is now more and more advanced film capacitors. Price is not the most important consideration, so PP capacitors and PS capacitors are used in audio equipment The frequency and the number of are getting higher and higher.