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Film Capacitors

A film capacitor is an electrical component consisting of a film of insulating material dielectric sandwiched between two metal plates, also known as metalized film capacitors. The dielectric used in modern film capacitors is usually polypropylene, polyester, polycarbonate, polystyrene, polyvinyl chloride, or nylon. Film capacitors are usually much smaller compared to their ceramic or electrolytic counterparts, and also constitute a much lower inductance rating, making them ideal for high frequency applications.

B25834L7475K9 application field and working principle

The B25834L7475K9 is a metallized film capacitor which is used to meet the needs of high frequency and pulse circuits. It is divided into medium voltage and high voltage according to the rated voltage, and its rated voltage ranges from 4V to 2500V. The B25834L7475K9 has advantages such as small size, high accuracy, low impedance, high dv/dt and long life.

The B25834L7475K9 is widely used in AC power supply, relay protection, medical equipment, signal transmission, power electronics, high frequency circuits, etc. Its working principle is that two metalized films are placed in the capacitor body and filled with insulating material. When the voltage is applied, the charge accumulates on both electrodes, and the voltage of both electrodes is greater than the voltage of the insulating medium, and an electric field is generated. The accumulation of electric field energy represents electrical energy.

When the electrons pass through the metalized film, the electric field generated by the applied voltage causes the electrical energy to be converted into electrical field energy, which is stored in the electric double layer of each electrode. When the voltage is increased, the electric field energy of the double layer increases. On the other hand, when the voltage is decreased, the electric field energy of the double layer decreases, and the charge disappears gradually and eventually disappears.

The metalized film capacitor has low equivalent series resistance (ESR), so it can keep its low frequency characteristics stable, and it can supply a constant current even if the voltage changes. This electric current is used to supplement the electric power equivalent to the power loss caused by the decreased electric voltage of the capacitor. In addition, it can also compensate for the power loss caused by the increased electric voltage of the capacitor, thus protecting the equipment or circuit from high or low voltage.

The B25834L7475K9 has high level of accuracy, low impedance, high dv/dt, low equivalent series resistance, and long life. This makes it ideal for use in medical equipment, high frequency circuits, signal transmission, AC power supplies, power electronics, and relay protection.

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