890324026007CS

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Film Capacitors

The 890324026007CS application field and working principles of film capacitors are well known for its high stability over time and wide temperature range. It is an essential element for power supply design which can help to reduce the amount of stress and noise on the main power supply circuit. These capacitors are manufactured with high precision and are applied in power switching applications, power supplies, frequency dividers and converters. Film capacitors can also be used for electromagnetic interference (EMI) filtering and motor drive.

The construction of these capacitors is basically an insulator and a conductor, usually in the shape of a film. The insulating material of these capacitors are ferroelectric materials such as polyethylene, polypropylene, polyamide and polycarbonates. These materials have very low dielectric losses resulting in high capacitance stability. The conductor can be copper, aluminum or aluminum-zinc alloy foils.

The working principle of a film capacitor is based on the physical properties of the materials used. Dielectric materials like polyethylene are characterized by having an ability to store and discharge electric charge. This property of the dielectric material is what creates the capacitor. When the electric field is applied, electric charges get transferred from one electrode to another resulting in the storage of electric charge.The current transmission of the electric charge will cause a capacitance that is dependent on the dielectric material and the size of the electrodes.

Film capacitors are used in various fields where high stability, low power losses, low cost and robust construction is desired. The applications can be in automobiles, computers, telecommunication, audio equipment, industrial control, robotics, medical equipment and consumer products. The common applications of film capacitors are for power, filtering and bypassing purposes. They provide superior characteristics such as temperature stability, long-term stability, low self-induction and high cycle life.

The most important characteristics of film capacitors are their high reliability and long-term stability due to the superior dielectric properties of the materials used. Another important factor is their robust construction, which is highly resistant to vibrations and mechanical shock. This feature makes them suitable for applications in high-vibration environments. Furthermore, their small size, low cost and flexibility make them suitable for use in congested applications such as in PCBs.

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