filmikondensaatorite

Filmikondensaatorid, also known as film capacitors, are a type of capacitor that uses a thin plastic film as its dielectric material. This film is typically made from materials like polyester, polypropylene, or polycarbonate. These films are metallized or have a metal foil electrode deposited onto them. The construction involves winding or stacking these metallized films or film and foil layers, which are then encapsulated in plastic or epoxy.

Film capacitors are known for their stability, low loss, and good high-frequency performance. Their dielectric properties are generally superior to those of ceramic capacitors in terms of leakage current and dielectric absorption. They are widely used in various electronic applications, including power supplies, audio circuits, motor run applications, and as filters. The choice of film material influences the capacitor's characteristics, such as its operating temperature range, voltage rating, and dielectric properties. For instance, polypropylene film capacitors are often favored for their low dielectric loss and high insulation resistance, making them suitable for high-frequency and high-voltage applications. Polyester film capacitors, while more economical, generally have a wider temperature range and are used in general-purpose applications.