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Film Capacitors

BFC2373EB474MD application field and working principle

Film capacitors, sometimes also referred to as “film-insulated capacitors”, “film-dielectric capacitors” or “film dielectric capacitors” due to the approach of construction, belong to the family of capacitors. Their purpose is to store electric energy and they are used in a wide range of capacitance-related tasks.

Film capacitors have many applications. These include filtering, circuitry timing, e-choke functions, motor start and running capacitors, and specialty components for communication systems. They are used in a wide range of electrical and electronic circuits, such as switching power supplies, DC-DC converters, electric vehicle charging circuits, LCD and LED backlighting, fans, motor controls, switching relays, UPS systems, and surge protection. Other applications include audio and video systems, automotive electronics, industrial computers, medical instrumentation, and more.

The BFC2373EB474MD capacitor is a typical application of film capacitors. BFC2373EB474MD are characterized by their high peak-voltage withstanding capabilities with low ESR and high capacitance stability. They are perfect for use in high-frequency/pulse applications off the grid.

The working principle of a film capacitor is based on the electrostatic effect. The capacitor consists of two metal conductors called electrodes, which are separated by a dielectric material, usually a thin film. When a voltage is applied across the electrodes, an electric field is created between them. This electric field stores electric energy, which is proportional to the capacitance of the element.

The capacitance of a film capacitor is determined by the ratio of the area of the electrodes to the distance between them. This electric field, which holds the charge stored in the capacitor, is called the electrostatic field. The film capacitor consists of several layers of insulation, such as polyester, polypropylene, PTFE, and Mylar, that provide insulation between the electrodes and the dielectric material consequently preventing the short circuit.

In BFC2373EB474MD capacitors, there are two main performance characteristics to consider- capacitance and voltage rating. The capacitance of this capacitor type ranges from 4.7nF to 47uF, and the voltage rating can vary from 63V up to 450V. Their high capacitance, combined with their ultra-low electric leakage, make them especially suitable for high-frequency/pulse applications off the grid.

In conclusion, film capacitors are a widely used type of capacitor because of their small size, low cost and wide range of applications. Bearing in mind their more extreme temperature limits and specialized features, BFC2373EB474MD capacitors have proven themselves to be an effective for many high-frequency/pulse applications.

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