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Aluminium Electrolytic Capacitors: Application field and Working Principle

Aluminium electrolytic capacitors, also known as electrolytic caps, or EDLC – electric double layer capacitor, are a type of polarized capacitor that is used in a variety of applications. Generally, they are seen as a low cost solution to high frequency electronic circuit applications and are suitable for applications where space is limited. Due to the unique structure of the Aluminium electrolytic capacitors, they can store energy in the form of their electrical capacitance.

Application field of aluminium electrolytic capacitors

Due to their properties, aluminium electrolytic capacitors have a wide range of applications in the electronics industry. Generally, they are used in high frequency circuits such as radio-frequency amplifiers, transceivers, receivers and transmitters. They are also useful in power supplies in order to reduce ripple voltage and noise, as well as in voltage inverters and transformers. In addition, they are often used to store energy in backup systems or to protect integrated circuits from overcurrents and voltage spikes.

Working principle of aluminium electrolytic capacitors

The working principle of a typical aluminium electrolytic capacitor is based on two layers of aluminium that are oxidized. The oxidation of the aluminium forms an insulating dielectric layer. A thin oxide film is held between two aluminium electrodes. The oxide layer acts as a dielectric medium, and the two layers of metal provide the electrical connection between the terminals of the capacitor.

An electric charge is stored in the capacitor due to the electric field between the two layers of aluminium. The electric field stores energy on the capacitor’s electrodes, which is referred to as electrostatic energy. When an electrical signal is applied to the capacitor, electrons will travel through the oxide layer and create an electric field. This field stores the electrical charge on the capacitor’s plates.

Aluminium electrolytic capacitors are available in various sizes and capacitance values. They have the ability to store large amounts of energy in a compact package, making them ideal for use in high frequency circuits. They are relatively inexpensive and easy to use, making them a popular choice for many applications.

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