80MXC4700MEFC30X40

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Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors are a type of capacitor that use aluminum for its electrode plate. These capacitors have to undergo a special electrolytic process to polarize the electrodes. The result of this process is a layer of oxide on the plates that is used to evenly store the charge. These capacitors are then stored in a dielectric liquid that acts as an insulator.

The 80MXC4700MEFC30X40 Aluminum Electrolytic Capacitor is one of the most common types of aluminum electrolytic capacitors in the market these days. It is widely used in applications such as motor-starting motors, DC-to-DC converters, and AC/DC rectifiers. The capacitor is composed of two aluminum foils rolled into cylinders, with each foil having a thin oxide layer and insulated from each other by a sheet of aluminum foil.

Applications of Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors are mainly used as power supply smoothing and decoupling components. They are ideal for applications requiring a large capacitance for a given volume as compared to other types of capacitors. The main application areas of aluminum electrolytic capacitors include decoupling, motor-starting motors, AC/DC rectifiers, DC-to-DC converters, power electronic equipment, TV receivers, and switching power supplies.

They are also popular in audio-frequency applications like loudspeakers, crossover networks, and tone-control circuits. They are employed in different audio equipment such as microphones, amplifier stages, power amplifiers, and radio receivers. Electromechanical components such as relays and solenoids can also take advantage of the relatively high capacitance that aluminum electrolytic capacitors provide.

Working Principle

Aluminum electrolytic capacitors are basically two aluminum electrodes insulated by a dielectric, usually a thin film of aluminum oxide. When a voltage is applied across these electrodes, the electric field and the resulting current will form a layer of oxide on the aluminum plate, which will act as an insulator. This insulating layer is used to store and transfer electric charge. When current is discharged the charge is released in an orderly fashion, providing a smooth and continuous current.

To ensure that the aluminum electrolytic capacitors work correctly, it is important that the dielectric oxide layer is kept in a polarized state, as this prevents it from discharging its stored charge. This polarized state is achieved by applying a bias voltage across the electrodes. The resulting voltage exceeds the breakdown voltage of the oxide so that a thin layer of it forms, allowing the oxide to maintain its polarization.

Conclusion

Aluminum electrolytic capacitors are highly appreciated due to their high capacitance, large temperature range and low leakage current. The densely packed and compact design of these capacitors makes them ideal for use in many different applications. The 80MXC4700MEFC30X40 capacitor combines all the features of an aluminum electrolytic capacitor and is suitable for applications such as motor-starting motors, DC-to-DC converters, and AC/DC rectifiers.

It is important to understand the working principle of aluminum electrolytic capacitors in order to make sure they are used properly. They rely on a polarized dielectric layer to store and transfer the charge and must be kept in a polarized state through the use of a bias voltage.

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