Working principle of variable frequency energy storage capacitor

What is the working principle of a variable capacitor?

The working principle of a variable capacitor entails varying the distance between plates or the overlap of plates to change the capacitance. In this article, we discuss what variable capacitors are, how they work, and their common applications in electronic systems. See our article on t ypes of capacitors to learn about other varieties. 1.

What is a variable capacitor?

A variable capacitor is an electrical component used to temporarily store electrical energy in an electric field. Unlike fixed capacitors, the capacitance of a variable capacitor can be altered by varying certain parameters such as the overlapping area of plates, the distance between them, or the dielectric material.

What is the construction of a variable capacitor?

A variable capacitor is constructed with two sets of hemispherical metal plates divided by air gaps. This simple construction makes them frequently used in various applications.

What is the difference between a fixed capacitor and a variable capacitor?

Unlike fixed capacitors, the capacitance of a variable capacitor can be altered by varying certain parameters such as the overlapping area of plates, the distance between them, or the dielectric material. They are widely used in applications like tuning circuits, oscillators, and filters. Figure 1.

What determines the capacitance of a variable capacitor?

The capacitance of a variable capacitor is determined by the overlapping area and distance between the rotor and stator plates. When the rotor plates are fully screwed into the fixed plates, the capacitance is at its maximum. Conversely, when the rotor plates are completely rotated out of the fixed plates, the capacitance is at its minimum.

What is the difference between air variable capacitor and vacuum variable capacitor?

Air variable capacitors, one of the most common types, consist of a set of fixed plates (stator) and a set of movable plates (rotor). By rotating the rotor, the overlap between the plates changes, allowing users to adjust the capacitance. Vacuum variable capacitors, on the other hand, enclose the plates in a vacuum-sealed housing.