155PMB850KS

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Film Capacitors

Film capacitors, also known as plastic film capacitors or film dielectric capacitors, are electrical components used to store electrical energy in an electric field. They are composed of two electrodes (also called ‘plates’) separated by a dielectric (insulating) material. A film capacitor is an electrical device that is made up of multiple layers of dielectric films (such as plastic, polyester, paper, or other types of films), which are wound together to form a capacitor. In addition to the dielectric material, there is typically an inner electrode, which usually consists of a metal foil, and an outer electrode, which is usually composed of a conductive foil. Together, these two elements form the capacitor.

155PMB850KS Application Field and Working Principle

The 155PMB850KS family of film capacitors provides an excellent solution for applications in power line frequency filtering. These capacitors are designed for use at frequencies up to 20kHz, and are available in a variety of voltages and capacitance values ranging from 0.1µF to 400µF. Because the process of lamination requires precise fabrication of the insulation layer, these capacitors offer multiple advantages such as excellent insulation resistance and high frequency stability.

The 155PMB850KS capacitors are made up of two dielectric films, an inner film, and an outer film. The inner film is typically aluminum and is dielectrically thin. The outer film is typically made of polyethylene with a thickness of about 0.15mm. The two are wound together, forming a capacitor. The two films are separated by an insulating layer of air which helps provide additional electrical stability. Because the dielectric is sandwiching the two layers of foil, it provides an electrical barrier between them, thus allowing for the electrical charges to accumulate.

When an electric current is applied to the film capacitor, electrons are collected and stored between the two plates. This charge is held by the dielectric material, which acts as an insulating layer. The voltage applied to the two plates will determine the capacitance of the capacitor, and as the voltage increases, so too will the capacitance. The stored energy accumulated in the capacitor is then released when the voltage is reduced, transferring the electrical energy back into the circuit. This process allows for the capacitor to filter unwanted noise and harmonics from the power line.

The 155PMB850KS capacitors are widely used in applications such as power line filters, DC-DC converters, power supplies, motor drives, telecom equipment, and military applications due to their excellent electrical performance. Their combination of high frequency stability, low ESR values, and dielectric breakdown voltage make them ideal for use in power line frequency filtering applications. As such, the 155PMB850KS capacitors are an excellent choice for designers working on high voltage or power line applications.

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