BFC238643124

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Film Capacitors

Film capacitors, designated by the series of BFC238643124, are electrical components that store energy temporarily in an electric field. Composed of an insulating plastic film, two parallel metal plates, and a thin dielectric coating, film capacitors are designed to adjust the frequency response in a circuit, reduce parasitic inductance, or decrease noise interfering with the signal. These parts are found across multiple industries including consumer and industrial electronics, military and space applications, and motor drives.

Application Field

The BFC238643124 series capacitors are used for a variety of purposes, depending on the specific application needs. Examples of popular applications for these capacitors include power-factor correction, DC bias, audio-circuit bypass, and pulse applications. Additionally, this series of capacitors is well-suited for AC line-filtering applications, due to its excellent high-voltage performance.

When choosing a capacitor for use in power-factor correction applications, designers must consider peak voltage rating, frequency range, and ripple current rating. Intended for pulse applications such as those aimed at controlling servo motors, feedback loops, and other electrical signals, the BFC238643124 series feature excellent frequency characteristics and current overloads to meet the specific needs of each task.

Working Principle

Like other capacitors, film capacitors work by creating an electric field between two metal plates. An insulating plastic film is used to separate the two plates, and a dielectric coating is then added to the plastic film. This configuration provides voltage load protection and improved heat characteristics over other types of capacitor technology.

The size of the electric field created by a film capacitor is determined by the surface area of the plates, the distance of the plates from one another, and the dielectric constant of the plastic film used. In the BFC238643124 series, the plastic film used provides a high dielectric constant, allowing for the creation of high electric fields with minimal electric charge.

The plate area of the capacitor is also determined by its capacitance rating, expressed in microfarads (μF). This rating indicates the amount of storage the capacitor is capable of storing, based on its composition and size. As the charge stored in the capacitor increases, the voltage drop across plates decreases.

Film capacitors provide excellent self-healing characteristics. This means that despite the large amount of energy stored in the capacitor, they remain safe in the event a surge exceeds the capacitance rating of the component. In these cases, the dielectric of the plastic film will break down, reducing the capacitance rating and allowing it to be recharged to a safe level.

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