SK220M350ST

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Aluminum electrolytic capacitors are widely used electronic components with various types and large capacity range. Among them, SK220M350ST is a type of aluminum electrolytic capacitor with a capacity of 220μF and a rated voltage of 350V. This type of capacitor is mainly used in fields such as power electronics, electrical control, instrumentation, audio and radio systems, etc. In addition, SK220M350ST capacitor also has the following main working principles.

Capacitance Mechanism:

SK220M350ST aluminum electrolytic capacitor mainly consists of an aluminum foil with a dielectric oxide film on one side and a metal electrolyte on the other side. The oxide film serves as the dielectric between the metal plates, which form two conductive surfaces between the two poles of the capacitor. When an alternating current is applied to the capacitor, the oxide layer will store energy in the form of displacement current. This displacement current creates an electric field between the metal electrodes and is responsible for the capacitor’s capacitance.

Leakage Current Mechanism:

In addition, SK220M350ST capacitors also have a relatively low leakage current due to the proper oxidation technology used on its plate. This is mainly because the oxide film on the plate has more flaws and poor insulation performance. In the case of AC power supply, the dielectric oxide layer will be partially charged and partially discharged by the current. But since the oxide film has flaws, there will be an electron tunnel effect which will produce a continuous leakage current from the oxide layer. This leakage current can directly reduce the capacitance of the capacitor and lead to the failure of the device.

Surge Current Mechanism:

In addition, SK220M350ST electrolytic capacitor also has the capability to sustain relatively high surge currents. This is due to the combination of dielectric oxide film and electrolyte medium. The dielectric oxide film of the capacitor can store large amount of energy while the electrolyte medium used can be quickly discharged when the voltage of the capacitor rises suddenly. The combination of two components can help to compensate the surge current in a very short time and protect the device from damage.

Temperature Coefficient Of Capacitance Mechanism:

In Sk220M350ST capacitor, the oxide layer of the oxide is not only a dielectric, but also has a relatively high temperature coefficient of capacitance. In general, the capacitance of the capacitor will change with the temperature and this phenomenon is called temperature coefficient of capacitance (TCC). The reason for this is that the location of the electric charges in the dielectric medium will change when the temperature changes. As a result, it will lead to changes in capacitance and other electrical properties of the capacitor.

Voltage Withstanding Mechanism:

One of the greatest advantages of SK220M350ST aluminum electrolytic capacitor is its high withstanding voltage. The withstanding voltage of an electrolytic capacitor is mainly dependent on the thickness and quality of the dielectric oxide film, as well as on the type of electrolyte used. Generally speaking, the thicker and higher quality the dielectric oxide film is, the higher the withstanding voltage will be. This capacitor is specially designed to get high withstanding voltage and improve the safety margin of the device.

Conclusion:

In conclusion, SK220M350ST aluminum electrolytic capacitors can be used in various applications, such as power electronics, electrical control, instrumentation, audio and radio systems, etc. This type of capacitor is characterized by its high capacitance, low leakage current, surge current sustaining capability, relatively high withstanding voltage, and temperature coefficient of capacitance. All these features make it an excellent choice for those applications requiring electrolytic capacitors.

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