BFC237590396

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Film Capacitors

BFC237590396 Application Field and Working Principle

Film capacitors, also known as film dielectric capacitors, plastic film capacitors, or polymer film capacitors, are capacitors with an insulating plastic film as the dielectric, sometimes combined with paper as a filler. Film capacitors are divided into polypropylene film capacitors, polyester film capacitors, polystyrene film capacitors, etc. According to the shape of the capacitor, it can be divided into vertical type, horizontal type and cylindrical type.

Application Field

Film capacitors are widely used in various types of electronic equipment, for example, computer, audio, communications electronics, audio equipment, and other electronic products used in switching power supply. In the field of instrumentation, industrial instruments, and aerospace, film capacitors are usually used for filter circuits, signal coupling and bypass.

Working Principle

Film capacitors are insulated and highly resistant to electric shock, good heat resistance, outstanding frequency characteristics and low dielectric loss at high frequencies. The working principle is that a film capacitor\'s dielectric material is located in the gap between two electrodes and works as an insulator between them. When an alternating electrical current passes through the capacitor, an electric field is established within the dielectric material, charging up the two plates and creating a capacitance.

The capacitor\' working process is that when an alternating current is applied, an electric field will be generated in the insulation medium between the two electrodes. Under the action of the alternating electric field, the positive and negative charges are periodically polarized at two electrodes, so that one electrode has a positive charge and one electrode has a negative charge. The capacitance of the film capacitors depends mainly on the following factors: the cross section area of the electrode plate, the distance between the electrodes, the relative dielectric constant of the medium.

Film capacitors are a kind of polarized capacitor. When the working conditions change, the capacitance change direction and voltage signs need to be pointed out. The temperature requires low temperature coefficient, because the change of temperature will cause the change of capacitance. The voltage should be stable between the two electrodes and national security should be strictly observed.

Conclusion

In conclusion, BFC237590396 is an application field for film capacitors and its working principle is based on the electric field created in the dielectric material due to the alternating current passing through it. The capacitor\'s performance is affected by many factors including the cross section area, the distance between the electrodes, and the relative dielectric constant of the medium. Film capacitors are also polarized capacitors and require low temperature coefficient as well as stable voltage between the two electrodes for optimal performance.

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