What is a film capacitor

Film capacitors can be said to be a capacitor that has risen rapidly in recent years. In the previous article, there was an article about the reasons why film capacitors have gradually replaced aluminum electrolytic capacitors. Interested friends can look back.

The film capacitor is a capacitor in which a metal foil is used as an electrode and a plastic film such as polyethylene, polypropylene, polystyrene or polycarbonate is stacked from both ends and wound into a cylindrical shape. Since the insulation resistance is high, the frequency characteristics are excellent (the frequency response is wide), and the dielectric loss is small, based on the above advantages, the film capacitor is used in a large amount on the analog circuit. According to different raw materials, it can be divided into metalized polyester film capacitors and metalized polypropylene film capacitors.

The working principle of the film capacitor is the same as that of the general capacitor. It stores the electric charge on the electrode and stores the electric energy. Usually, it is used together with the inductor to form an LC oscillating circuit. The working principle of the capacitor is that the electric charge will move under the electric field, when the conductor Having a medium between them hinders the movement of charge and causes the charge to accumulate on the conductor, resulting in the accumulation of charge.

A brief introduction to the film capacitors is convenient for novices and users to have a quick understanding of film capacitors. The development direction of film capacitors is low cost, miniaturization, chip formation, ultra high pressure, high power, high precision and high reliability. With the application and development of new materials and new process technologies, film capacitors will undergo major changes. With the development of complete equipment, the application of film capacitors will bring opportunities and challenges.