Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors are widely used in electronic circuits, particularly in those projects requiring large capacitance values. They are also commonly used for filtering, voltage smoothing, power supply regulation, decoupling, and other various applications. As a type of polarized capacitor, their characteristics and polarities need to be taken into account when performing circuit design work. It is important to take note of the rated working voltage and temperature range to determine whether an aluminum electrolytic capacitor is suitable for the intended application.

LGJ2C181MELZ15 Application Field

The LGJ2C181MELZ15 is an adjustable snap-in aluminum electrolytic capacitor by Panasonic, designed for general purpose usage in electronic circuit applications. It features a tightened tolerance of 20%, ±10% at 120Hz - 1 minute, and a long life span of 2,000-3,000 hours at 105℃. It offers a capacitance of 18,000uF, with a rated voltage of 100V DC.

Due to its large capacitance value of 18,000uF, it is a suitable choice for various high power applications, such as power supplies, LED lights, audio devices, motor drive circuits, UPS systems, emergency lights, and many more. As its rated voltage of 100V DC is relatively high, it is suitable for use in circuits that need to handle higher voltage levels. In addition, the long life span of 2,000-3,000 hours at 105℃ ensures a higher degree of reliability and stability in the capacitor’s performance.

LGJ2C181MELZ15 Working Principle

Aluminum electrolytic capacitors are constructed using a thin aluminum oxide dielectric layer which is formed anodically on the anode foil, with the electrolyte serving as the cathode. This forms the \'pseudo capacitor\' structure, consisting of the two electrodes and the dielectric in-between them. The capacitor’s capacitance value is determined by the surface area of the aluminum oxide dielectric layer, as well as its thickness and insulation resistance. The LGJ2C181MELZ15 uses a combination of the materials aluminum, aluminum oxide, and electrolyte, as well as gold-aluminum contacts, to ensure its long life expectancy and stability.

During operation, when a reverse voltage is applied to the electrode, electrons in the anode will migrate to the electrolyte, which will then react and form a protective layer over the aluminum anode further increasing the insulation by the oxide layer. This protective barrier prevents further oxidation and helps prolong the capacitor’s life span. When a voltage is applied in the correct direction, charge will accumulate on both sides of the capacitor and will result in current flow.

Conclusion

The LGJ2C181MELZ15 is a general purpose, adjustable snap-in aluminum electrolytic capacitor designed for use in various electronic circuits. Its large capacitance value of 18,000uF and rated voltage of 100V DC make it suitable for high power applications, while its long life span of 2,000-3,000 hours at 105℃ ensures the capacitor’s reliability and stability. Its working principle is based on a \'pseudo capacitor\' structure, consisting of aluminum, aluminum oxide, electrolyte, and gold-aluminum contacts. This makes it a great choice for many projects, as its combination of materials helps ensure its long life expectancy and stability.