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Film Capacitors

BFC238351273 Application Field and Working Principle

A film capacitor, sometimes referred to as a plastic film capacitor, is a type of capacitor that uses a thin film as the dielectric medium to store electrical energy. The advantage of the film capacitor is its excellent insulation performance. Its application field is extensive, mainly used in a high frequency, high voltage occasions.

The working principle of the film capacitor is quite simple. The electric field is generated between the insulating film and the electrodes, and the energy is stored in the electric field between the electrodes and the film. When the capacitance of the film capacitor is charged, the positive energy of the electric field is stored in the left of the dielectric layer, and the negative energy of the electric field is stored in the right of the dielectric material. Constructively, these positive and negative electric fields provide the energy storage capacity of the film capacitor. The capacity of the film capacitor determines the amount of energy that can be stored in it.

When the power supply is connected to the film capacitor, the capacitor will charge up and generate a pressure. The potential difference depends on the capacitance of the capacitor. When the power supply is disconnected, the capacitor will gradually discharge the current and the capacitor will have to generate a reverse current.

The film capacitor is a part of a combination of capacitors. It is mainly used for current filtering, noise reduction, motor starting, electrical/electronic equipment, pulse power supply, for power conditioning of high frequency conversion and storage circuits. Its application field is varied, and is widely used in medium and high pressure, high frequency, energy storage, security insulation fields etc.

The film capacitor is used to store electrical energy on an electrical conductor. Its performance is better than ordinary electrolyte capacitor, with larger capacity, smaller dielectric loss, lower temperature coefficient, longer service life, and larger capacitance range.

In conclusion, the film capacitor is a high performance device with a wide application field. It is mainly used in high frequency, high voltage conditions and has excellent insulation performance. By combining with other components, the field can be greatly expanded to meet different conditions and needs.

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