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Film Capacitors

Introduction

Film capacitors are constructed using a dielectric film—most commonly plastic films such as polyethylene terephthalate (PET)—that is helically wound around a spindle. An FCN1913E123K series film capacitor is the most common type, with a dielectric of PET film and a recessed center pole (L1) designed for snap-in mounting. The construction allows them to be highly reliable, and offer greater temperature stability, excellent self-healing characteristics and higher working voltage than other types of electrolytic capacitors.

Application Field

Film capacitors have the capability of carrying high current at high frequencies. This makes them ideal for use in filter circuits, power supplies, low power converters, motor control systems, and other applications demanding high-voltage, high-current, and high-frequency power. FCN1913E123K series film capacitors are mainly used in bulbs, energy saving lamps, low-voltage lighting systems, and domestic electrical appliances.

Working Principle

The FCN1913E123K series film capacitor is based on the principle of electrostatics—the study of the interaction of electric and magnetic fields. In this type of capacitor, a dielectric film is inserted between two conductive plates, forming an electric field. The strength of the electric field is dependent on the material and thickness of the dielectric film, and upon the distance between the two plates.

The electrical current is conducted between the two conductive plates by the process of “electron tunneling”. Electrons tunnel from one plate to the other through the thin dielectric barrier. As a result, the electrons are retained in the space between the two plates, forming an electric field between them. The magnitude of this electric field is determined by the dielectric constant of the material. The higher the dielectric constant, the stronger the field.

When a voltage is applied to the two plates, an electric current is generated. This current enables energy to be stored, and it is this stored energy that is responsible for the capacitor\'s ability to store and transfer electrical charge.

The key benefits of using a film capacitor rather than an electrolytic capacitor are greater temperature stability, higher maximum frequency, higher self-healing characteristics, and higher working voltage. The combination of these benefits make the FCN1913E123K series the preferred capacitor for many applications.

Conclusion

The FCN1913E123K series of film capacitors is ideal for use in applications requiring high-voltage, high-current, and high-frequency power. It offers superior temperature stability, excellent self-healing characteristics, and a higher working voltage than other types of electrolytic capacitors. The wide variety of applications and versatility of film capacitors make them an excellent choice for electronic devices.

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