WEET Concept Structure Composition Performance Characteristics and Typical Applications of Solid Aluminum Electrolytic Capacitors

Date: 2020-08-20
Conductive polymer aluminum solid electrolytic capacitor is the abbreviation of conductive polymer solid aluminum electrolytic capacitor, which is one of the most advanced capacitor products.

The biggest difference between the solid capacitor and the ordinary liquid electrolytic capacitor is that the solid capacitor uses a completely different dielectric material conductive polymer material.

At high temperatures, such solid polymer dielectric particles, whether swollen or active, are lower than the liquid electrolyte, and the boiling point is as high as 350 ℃, so there is almost no risk of bursting. Theoretically, it is almost impossible to explode the solid state capacitor due to its "no slurry can explode".

Structure of solid aluminum electrolytic capacitor

All capacitors include two layers of conductive materials (or electrodes), which are separated from each other by an insulator combined with dielectric materials. An electric field will be generated between these layers, which can store energy when there is current to charge the capacitor.

The dielectric layer forms a resistance that varies with the voltage. The current of this resistance is called leakage current. When the voltage reaches the "formation voltage", the leakage current rises sharply and even damages the capacitor. This unidirectional dielectric cannot withstand the reverse voltage, and a small reverse voltage will form a large reverse current to damage the capacitor. The "formation voltage" applied to the anode foil for polarization determines the thickness of the dielectric (aluminum oxide layer), which determines the withstand voltage level of the capacitor.

The structure of solid aluminum electrolytic capacitor is the same as that of traditional aluminum electrolytic capacitor. It is also an aluminum winding structure, but the electrolyte is replaced by a solid form of polymer material, 3,4-ethylenedioxythiophene (PEDOT). It is precisely this PEDOT polymer material that has established the new status and excellent characteristics of solid aluminum electrolytic capacitors.

Performance characteristics of Solid Aluminum Electrolytic Capacitors

Solid state capacitors have the characteristics of low impedance, high ripple current resistance, long service life and high thermal stability in high-frequency environment.

Typical Application of Solid Aluminum Electrolytic Capacitors

In the DC power circuit, when the solid aluminum electrolytic capacitor is used as a filter capacitor, its anode (positive pole) should be connected with the positive end of the power supply voltage, and the cathode (negative pole) should be connected with the negative end of the power supply voltage, without reverse connection, otherwise the capacitor will be damaged.


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