B25856J7104M3

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Film capacitors are electronic components used to store electrical energy in the form of electrostatic fields. They are the electrical equivalent of a spring, where the energy stored is proportional to the relative positions of two plates or conductors. Because of their ability to store energy, film capacitors are widely used in a variety of electronics, such as in power supplies, radio receivers, and television circuits. They are also commonly found in industrial applications, such as high voltage power lines, motor drives, and industrial automation systems.

B25856J7104M3 is a polypropylene film capacitor manufactured by EPCOS. It is available in multiple sizes and configurations, ranging from 0.047μF to 10,000μF. Its maximum temperature range is from -55°C to +105°C and its voltage range is from 250VAC to 690VAC. This capacitor is designed for use in harsh environment applications, providing high stability and reliability. It is widely used in various power supplies, ballasts, and lighting system applications.

The working principle of a film capacitor relies on the phenomenon of capacitance, which is defined as the ratio between the charge stored on the surface of a conductor (or dielectric material) and the potential difference between two surfaces. This ratio is defined by the capacitance of the capacitor.

To understand the working principle of a film capacitor, we must first understand the concept of electrical capacitance. The capacitance of a capacitor is determined by the ratio of the charge on its surface to the potential difference between two plates. The charge stored on the capacitor is proportional to the area of the plate and the potential difference between the two plates. When two conductors with different potentials are connected, an electrostatic field is created. The field causes the capacitance of the capacitor to increase, and consequently, the voltage drop across the plates increases.

When a voltage is applied to the capacitor, charges are also stored in the dielectric layer between the plates. This change in charge causes the capacitance to vary with the applied voltage, and this is referred to as capacitance modulation. At any given voltage, the capacitance of the capacitor can be controlled by the dielectric thickness.

The B25856J7104M3 is a high performance polypropylene film capacitor with superior stability and reliability. It is commonly used in power supplies, ballasts, and lighting systems due to its high voltage rating and high temperature tolerance. Its construction consists of two raw polypropylene film sheets, a prefabricated blank, an internal PTC element, and high-temperature-resistant sealant. The capacitor’s PTC element is constructed of two metal plates separated by an insulating material, allowing it to perform its thermal protection function. The raw film and coil elements work together to provide high insulation and stability.

In summary, the B25856J7104M3 is a polypropylene film capacitor used in power supplies, ballasts, and lighting systems. It is designed for use in harsh environments and its construction provides a high insulation and stability level. Its working principle relies on the phenomenon of capacitance, which is the ratio between the charge stored on the surface of a conductor and the potential difference between two surfaces.

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