BFC236851103

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Film Capacitors

Film capacitors, also known asPolyester Film Capacitors, are one of the most common typesof capacitors used in electronics. They are characterized by their simple construction andhigh voltage ratings. Film Capacitors (BFC236851103) are designed to store energy in the form ofelectrical charge, and can be used in a variety of applications.

Applications

Film Capacitors are commonly used in AC line filtering, audio filters and signal coupling applications.Their high power handling capabilities and voltage ratings make them ideal for use in highvoltage and high current applications, such as charging circuits, switching power supplies,and other power electronics circuits.Due to their very low equivalent series inductance, theyare also often utilized in power factor correction circuits, voltage regulation circuits, andDC-DC converters.

Film Capacitors are also often used in automotive applications, where their ability to rejectEMI/RFI is highly valued. Additionally, they can be used in high voltage dischargecircuits, such as spark gap applications, as well as in transient suppression and snubbercircuits.

Working Principle

The working principle of a film capacitor is quite simple. It consists of two metal plates separated by an insulating film. When a potential difference is applied across the plates, thenegative plate is charged with excess electrons, and the positive plate is charged with anexcess of protons.

The charges on the plates then attract each other through electrostatic forces, creating adipole, or electrical “charge separation”, inside the capacitor. This charge separationprovides the capacitor with its capacitance, or the ability to store electrical charge. It can,therefore, be used to regulate and smooth out voltage fluctuations in an electrical circuit.

Conclusion

Film capacitors are one of the most common and widely used types of capacitors in theelectronics industry. Due to their high voltage rating and low equivalent series inductance,they are ideal for applications which require high power handling and/or voltage regulation.Their use in transient suppression, snubber, and spark gap applications has also increasedover the years. The working principle behind the film capacitor is simple, and involves thecreation of charge separation between two metal plates which are separated by an insulatingfilm.

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