860240378009

Aluminum electrolytic capacitors, also known as wet aluminum electrolytic capacitors, are constructed with two aluminum foils, between which is placed a paper separator that has been soaked in an electrolyte. They offer high capacitance, stiffness, and good reliability in miniaturization. Their main application scope covers manufactured goods, computer displays, consumer electronics, automobile and medical equipment.

860240378009 aluminum electrolytic capacitors are a type of capacitor that uses an anode of an aluminum foil which carries a heavy oxide coating as the current collector and an electrolyte as the separator. A voltage is applied between the cathode, usually a lead foil, and the anode, causing ions from the electrolyte to carry a current to the oxide layer. This generates a layer of electrons on the surface of the aluminum oxide, forming a dielectric layer of energy-storing ions that is highly electrically insulating. The combination of the anode and dielectric forms the capacitance of the device.

The electric field generated by the voltage applied between the anode and cathode causes a thin electrolyte to diffuse between the metal foils. This results in an electrolyte bridge which adds to the capacitance of the device. The electric field is also responsible for breaking bonds formed between the material particles and oxygen molecules within the oxide, resulting in the formation of hydroxyl ions at the oxide surface. These hydroxyl ions react with the electrolyte to form compounds on the anode surface. This increases the electrode surface area and hence increases the capacitance of the device.

860240378009 aluminum electrolytic capacitors are mainly used for power circuits, such as in DC-DC converters, power amplifiers, power supplies, and so on. The components are easy to use and offer a high capacitance for a given size. These capacitors are also well suited for applications that require an AC supply, because they have low self-inductance and high ripple current performance.

The advantages of aluminum electrolytic capacitors include low cost, high capacitance, and low ESR. Their disadvantages mainly include long recovery time, limited operating temperature range, and brief lifespan. Nonetheless, aluminum electrolytic capacitors are still widely used in power electronic applications due to their excellent performance.