BFC247964623

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Film Capacitors

Film capacitors, with the part code BFC247964623, are polarized capacitors that are primarily used in high frequency and high voltage applications. Film capacitors are most commonly used for stabilizing AC / DC voltages, power line filtering, and in high temperature applications due to their relatively low dielectric absorption rate and excellent temperature and frequency characteristics. Additionally, they are well suited for arcing applications due to their long life and low leakage current.

Construction

These components utilize a dielectric material such as polypropylene film or aluminum film in order to achieve the desired electrical characteristics. The metal layers, which generally consist of metalized polyester, are insulated from one another by a thin layer of insulating material. The insulating layer may be either thermally cured or thermally evaporated depending on the exact application requirements. Each of these layers are then typically bonded to form the capacitor element.

Design Considerations

When choosing a film capacitor for a given application, there are several important design considerations that need to be taken into account. These include the operating voltage, operating temperature, capacitance, and mechanical size. Additionally, it is important to consider the desired capacitance stability over temperature, operating frequencies, and voltage transients.

Application Field and Working Principle

Film capacitors are commonly used for a wide variety of applications including RF, motor, and power conversion. They are often used to filter out higher frequency noises in power lines, stabilize AC / DC voltage levels, or to improve efficiency in motor applications. They can also be used to provide a high current pulse for arcing applications.

The working principle of a film capacitor is relatively simple. When an electric field is applied across the capacitor plates, the dielectric material stores electric charge. This charge builds up until it reaches the maximum voltage rating of the capacitor, and then the capacitor dissipates the excess voltage. The amount of stored charge is proportional to the capacitance value, thus allowing for a wide variety of capacitance values to be used in the same application.

Conclusion

Film capacitors offer several advantages over their alternatives, such as lower leakage current, higher temperature and frequency stability, and longer life. They are often used in high temperature, high voltage, and arcing applications. Additionally, they are a relatively simple design, making them easy to manufacture and modify. However, they do have some drawbacks as well, including a limited voltage range and susceptibility to spurious signals.

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