Film Capacitors

BFC2373EE394MD Application Field and Working Principle

Film capacitors, also known as plastic film capacitors, polyester film capacitors or PFC, are capacitors that use plastic films as a dielectric. They can be made from polypropylene, polycarbonate and polyester films, each with its own particular characteristics. Film type capacitors have a wide range of applications in many electrical and electronic circuits, such as the coupling of different audio and video signals or in power supplies.

BFC2373EE394MD capacitors are a type of film capacitor specially designed for resonant circuit applications such as band-pass filters, harmonic filters, and EMC filters. Specifically, these capacitors use double and triple metallized polypropylene film in combination with an aluminum oxide layer as a dielectric which improves the breakdown voltage of the capacitor and ensures a higher AC current handling capability. Furthermore, the ceramic tube design improves the capacitor\'s capacitance stability and shielding performance.

The working principle of film capacitors is based on the same principles of all other types of capacitors. The dielectric material between the two conductors forms an electric field when a voltage is applied. This electric field will then store the charge to produce an electric current. The capacitance of the film capacitor is determined by the physical characteristics of the dielectric material and the size of the capacitor itself. The dielectric of the film capacitors can be of different types, depending on the application, such as polypropylene, polycarbonate, and polyester. The dielectric material determines the capacitance of the capacitor, as it is the dielectric layer that creates the electric field to store the charge. The different dielectrics also determine the maximum voltage that the capacitor can withstand. The size of the capacitor determines the level of current it can handle as well as the capacitance.

In conclusion, BFC2373EE394MD capacitors have a wide range of applications for resonant circuit applications, as they are designed to meet the high frequency requirements of these circuits. The ceramic tube design of the BFC2373EE394MD ensures high capacitance stability and excellent shielding performance. The main working principle of film capacitors is based on the same principles of other types of capacitors and is determined by the type of dielectric material present as well as the size of the capacitor.