BFC233915682

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Film capacitors belong to a family of capacitors that encompass a wide variety of technologies such as polyester, polypropylene, paper-in-oil, and more. This article delves into the BFC233915682 application fields and working principles of film capacitors.

Application Fields of Film Capacitors

Film capacitors are widely used in AC power-related products. The main application fields are power factor correction and symmetrical power source compensation.

In the case of power factor correction, film capacitors can be used to reduce the deviations between the active and reactive components of the current. This improves the quality of the current supply and raises the power factor, thus reducing power losses.

In the case of symmetrical power source compensation, film capacitors are used to increase the effect of symmetrical power sources such as filters and DC rectifiers. This improves the quality of the power sources and reduces power losses.

Film capacitors are also used in DC-DC converter, motor control circuit, audio circuit, display circuit, LED drive circuit, power amplifier circuit, switching regulator, power supply, and other circuits.

Working Principles of Film Capacitors

A film capacitor is based on two adjacent conductive plates that are separated by a dielectric film. The dielectric film can be metal foil, paper, or plastic film. The dielectric film acts as an insulator, preventing electric current from flowing between the plates.

When a voltage is applied to the film capacitor, electric charges accumulate on the two plates. Since the plates are separated by the dielectric film, a static electric field is created within the capacitor.

When the applied voltage changes, the electric field also changes, allowing the capacitor to temporarily store and accumulate the electric charge. This process is known as capacitance. The amount of charge stored in the capacitor is proportional to the applied voltage, and the capacitance of the capacitor is determined by its area and dielectric constant.

As the area of the capacitor increases, the capacitance increases, and when the dielectric constant increases, the capacitance also increases. There are various types of capacitors available with different dielectric constants, allowing for a wide range of capacitance, Voltage withstanding and cost.

Therefore, by selecting the correct type of film capacitor, it is possible to design a power supply or source filter with better performance, stability and safety.

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