Two Major Types of Film Capacitors

Film capacitors are an electronic component that is used in many home appliances and has a wide range of applications! Film capacitors have gradually replaced aluminum electrolytic capacitors.

The film capacitor is a capacitor in which a metal foil is used as an electrode and a plastic film such as polyethylene, polypropylene, polystyrene or polycarbonate is stacked from both ends and wound into a cylindrical shape. The working principle of the film capacitor is the same as that of the general capacitor. It stores the electric charge on the electrode and stores the electric energy. Usually, it is used together with the inductor to form an LC oscillating circuit. The working principle of the capacitor is that the electric charge will move under the electric field, when the conductor Having a medium between them hinders the movement of charge and causes the charge to accumulate on the conductor, resulting in the accumulation of charge.

Film capacitors can be divided into DC film capacitors and AC film capacitors. DC film capacitors are film capacitors that operate in circuits powered by DC power. They can be classified into general-purpose, power-suppressing electromagnetic interference, pulse and precision. Class IV; AC film capacitors refer to film capacitors operating in circuits powered by an AC power source, which are driven by function, motor power, and power factor compensation.

Thin film capacitors are widely used because of their high insulation resistance, wide frequency response, and non-polarity, so thin film capacitors are often used on integrated circuit boards, analog circuits, and the like. Especially in the signal cross-linking performance is very superior, compared with other media, the film capacitor has a small dielectric loss, wide frequency response, can ensure that the signal will not change when transmitting. In order to meet people's requirements for audio quality and improve sound quality, the current audio equipment is more and more advanced. The price is not the most important factor, so PP capacitors and PS capacitors are used in audio equipment. The frequency and quantity are also getting higher and higher.