B41691A8157Q9

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Aluminum Electrolytic Capacitors: B41691A8157Q9 Application Field and Working Principle

Aluminum electrolytic capacitors are widely used electronic components due to their relatively large capacitance and suitable size. B41691A8157Q9 capacitors are one such type of aluminum electrolytic capacitor, which are especially designed for ac line filter applications with a particularly high self-healing performance. This article will discuss B41691A8157Q9 capacitors, their field of application and working principle.

Application of B41691A8157Q9 Capacitors

B41691A8157Q9 capacitors are mainly used in ac line filter applications. They can be installed in the equipment along with an inductor to form a low-pass filter, providing effective attenuation of high frequency noise within the power network. Additionally, their self-healing characteristics make them a suitable choice for installation in on-board modules, where voltage fluctuation and lightning strikes can be common.

B41691A8157Q9 capacitors can also be used in a wide range of other applications, such as transient voltage suppression (TVS), common-mode filter circuits for suppressing high-frequency noise, EMI/EMC filter circuits in switching-mode power supplies and motor drives, and DC-to-DC converters/regulated power supplies. Furthermore, due to their low ESR and ESL, they can also be used in high-intensity LED lighting circuits for dimming control.

Working Principle of B41691A8157Q9 Capacitors

An aluminum electrolytic capacitor is constructed much like a standard capacitor, but with an important difference. Instead of dielectric material, there is an electrolytic paste between the two metallic plates. The electrolyte allows ions to pass between the plates, creating an electric current. When a voltage is applied to the plates, an electrolytic reaction occurs between oxygen ions from the electrolyte and the aluminum foil of the plates, creating a layer of oxide on the surface of the aluminum. This oxide layer serves as an effective insulator between the plates, significantly increasing the capacitance of the device.

B41691A8157Q9 capacitors consist of two series-connected aluminum electrolytic cells with reverse polarities. This design allows for a much higher capacitance than a single cell, while still providing a self-healing effect. When voltage is applied to the capacitor, an oxide layer is formed on the surface of the plate, preventing adjacent pores in the aluminum from shorting out. When the applied voltage is too high, the oxide layer will fail due to a deionization effect, leaving two adjacent pores shorted out. However, the zero potential formed between the two shorted pores will cause a voltage increase in the neighborhood, which in turn re-forms the oxide layer. Thus, regardless of the number of volts applied, the capacitor will eventually recover and restore its original capacitance.

Conclusion

B41691A8157Q9 aluminum electrolytic capacitors are specialized components designed for ac line filter applications. Due to their high self-healing performance, they can also be used in transient voltage suppression (TVS), common-mode filter circuits, EMI/EMC filter circuits, and DC-to-DC converters. The working principle of these capacitors is based on the formation of an oxide layer on the surface of the plate that serves as an effective insulator between the plates, thus providing a large capacitance.

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