63ZLH820MEFC18X20

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Aluminum electrolytic capacitors, or simply electrolytic capacitors, are electrochemical capacitors with a larger capacitance per unit volume than other types, designed to store a significant amount of electric potential energy. 63ZLH820MEFC18X20 belongs to this family of capacitors, and their application fields and working principle can be explained as follows.

Application Fields

The 63ZLH820MEFC18X20 aluminum electrolytic capacitors are popularly used for power supply noise filters and rectification smoothing, signal coupling and filtering; timing, filtering and decoupling for power electronic products; start, snubber circuit and other frequenct-divider circuits, etc. It also can be used as rectifier smoothing capacitors and power relays, motor starters and signal transient devices.

Working Principle

The 63ZLH820MEFC18X20 capacitor works by holding a charge in the form of an electric field, like other types of capacitor. However, the mechanism that allows it to be more efficient than other types of capacitor relies on its aluminum oxide layer. This oxide layer acts very much like a reverse-biased diode and helps protect the capacitor from overvoltage. When the applied voltage is higher than the rated one, current is forced through the oxide layer, preventing damage to the electrodes and reducing the electric field.

The other important concept here is the pseudo-capacitance created in the electrode. To increase the capacitance without reducing the breakdown voltage, the electrodes are given a microscopic corrugated structure. These corrugations increase the effective area of the electrodes, thereby allowing for increased capacitance without increasing breakdown voltage. A thinner oxide layer is also then used to reduce the total area of the electric field.

To sum up, the 63ZLH820MEFC18X20 aluminium electrolytic capacitor contains a special kind of electric double layer that consists of a thin layer of aluminium oxide. The presence of this thin oxide layer leads to the ability of the capacitor to attenuate power line noise and to survive high voltages due to the pseudo-capacitance that increases capacitance without reducing breakdown voltage. Moreover, this type of capacitor is popular in power supply noise filters, rectifiers, signal coupling and filtering, and can be used in a variety of applications.

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