B25835M7224K7

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Film capacitors are a family of capacitors whose insulation and dielectric material are both made of plastic film. The basic structure and working principle of film capacitors can be divided into two major categories: film impregnated capacitors and film wound capacitors. Among them, B25835M7224K7, one particular model of film capacitor, is a type of film impregnated capacitors, made of metallised polyester film.

Component

B25835M7224K7 film capacitance is composed of several components: metallised polyester film, electrodes, insulation layers and cases. The film is the most important component in the whole structure since it provides insulation and the dielectric properties. The electrodes are made by spraying in the form of metal plates on both sides of film, and it forms the electric connection between the capacitor and the circuit. The insulation and the moisture protection layers are formed by coating resin material which also serves as a protection against electrical arcing between electrodes. The electric arcing can ruin the capacitors if not taken care of. Finally, the cases are mainly made of resin and plastic materials, which give the capacitors their physical appearance and provides extra insulation and protection.

Application Field

B25835M7224K7 film capacitors, due to their excellent electrical and dielectric properties, are mainly used in the fields of power, signal and frequency electronics. Specifically, B25835M7224K7 are suitable for rectifier capacitors and power factor capacitors in electronic power supplies, such as AC/DC converters, DC/DC converters, and inverters. Moreover, B25835M7224K7 can also be used as filter capacitors for power filter networks, and can also be used as signal capacitors in the circuits of pulse, signal, and other electronic circuits.

Working Principle

The working principle of film capacitors, such as B25835M7224K7, is relatively simple. When an alternating voltage is applied to the capacitor, a corresponding current will flow through the capacitor. When the current flow, the capacitance is formed by the accumulation of electrons in one plate and the accumulation of holes in the other. The magnitude of current depends on the magnitude of voltage, capacitance and impedance of the capacitor itself. During this process, the current and the voltage are in opposite phase, and the energy in the form of static electric field is stored in the capacitor, making it act as a filter.

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