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Film Capacitors

Film capacitors (BFC247964124) are widely used in applications that involve storing and/or releasing energy. Commonly used in power supplies, dc-dc converters, back-up voltage supply, rectifiers, etc., film capacitors are found in almost every electronic circuit. Film capacitors are extremely robust, they have low ESR (equivalent series resistance), low ESL (equivalent series inductance) and a wide operating temperature range, making them a viable choice in many cases.

Working Principle

Film capacitors generally use metallic foil and plastic film to make up the electrodes. The plastic film is treated to become an insulating material, usually coated in a thin layer of metal. The metal and plastic films are separated by a thin film of impregnated resin. When electricity is applied to the leads of the capacitor, charges build up along the metal layers, creating an electric field across the dielectric layer. This electric field capacitates the two metal electrodes, resulting in the storage of electrons and thus, an increased electrical charge.

Types

Film capacitors come in several types including paper, pulse, and polypropylene. Paper film capacitors are usually found in small sizes and can withstand temperatures of up to 120 degrees Celsius. They are highly accurate and have low dielectric absorption. Pulse film capacitors are often seen in high-frequency applications due to their low ESR and ESL ratings. These are considered to be highly reliable, have low dissipation losses, and are vibration resistant. Lastly, polypropylene capacitors are often used in audio applications, due to their high energy storage capacity and can withstand temperatures of up to 105 degrees Celsius.

Applications

Film capacitors can be used in the following applications: power supplies, dc-dc converters, rectifiers, low/high frequency filters, voltage converters, snubber circuits, pulse formers, and other electronic circuits. In power supplies, film capacitors are used for both smoothing and de-coupling purposes. They also offer an economical alternative for power factor correction. Additionally, film capacitors are widely used as snubber circuits and pulse formers due to their low ESR and high peak pulse currents.

Advantages

Film capacitors provide a number of advantages when compared to other capacitor types. Their low ESR and ESL ratings reduce power losses due to current and voltage drops, and their wide operating temperature range makes them suitable for use in most environments. Additionally, they provide a hold up during transients ensuring free-running operation. Lastly, their robustness and high peak pulse capability makes them suitable for applications where short pulse overloads are expected.

Conclusion

Film capacitors (BFC247964124) are a popular choice for applications that require energy storage and release. Their low ESR and ESL ratings make them suitable for use in power supplies, snubber circuits and pulse formers. Additionally, their wide operating temperature range and high peak pulse capability makes them suitable for use in most environments. Lastly, their robustness and long operational life make them a reliable choice for many applications.

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