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As the most commonly used electronic components in capacitor components, electrolytic capacitor is the product with the largest sales volume of electrolytic capacitor manufacturers. What characteristics of electrolytic capacitor can be widely used?
Electrolytic capacitor is a kind of medium of capacitance. The electrolyte coating has polarity, and the positive and negative points can not be connected wrongly. The capacitor is composed of two metal poles sandwiched with insulating material (dielectric).
The capacitance per unit volume of electrolytic capacitor is very large, tens to hundreds of times larger than other types of capacitors. And the rated capacity can be very large, and can easily achieve tens of thousands of μ f or even several F.
In contrast, it has an overwhelming advantage over other types, because the constituent materials of electrolytic capacitors are ordinary industrial materials, such as aluminum, etc. The equipment for manufacturing electrolytic capacitors is also common industrial equipment, which can be large-scale and relatively low-cost.
Electrolytic capacitors are usually made of metal foil (aluminum / tantalum) as the positive electrode and the insulating oxide layer (alumina / tantalum pentaoxide) of the metal foil as the dielectric. Electrolytic capacitors are divided into aluminum electrolytic capacitors and tantalum electrolytic capacitors according to their positive electrodes.
The negative electrode of aluminum electrolytic capacitor is composed of thin paper / film or electrolyte polymer immersed in electrolyte solution (liquid electrolyte); manganese dioxide is usually used as negative electrode of tantalum electrolytic capacitor. Because of the electrolyte as the negative electrode (pay attention to distinguish from the dielectric), the electrolytic capacitor gets its name.
The above characteristics determine the importance of electrolytic capacitor in circuit design. When selecting capacitor, do not choose products only because of its low price. We must pay attention to the comprehensive quality of electrolytic capacitor, and also select according to the comprehensive strength of electrolytic capacitor manufacturer, which is helpful to the maintenance in the later use process.