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Aluminum Electrolytic Capacitors

Electrolytic capacitors, or “electrolytics”, are an important class of capacitors featuring very high capacitance levels and typically used for power supply filtering. Polarized because one side of the capacitor is the anode and the other the cathode, these capacitors are distinctive in shape and construction. Aluminum electrolytic capacitors, in particular, feature a layer of aluminum oxide formed on the surface of the aluminum foil anode. The work of an aluminum electrolytic capacitor can be better understood with a look at the part numbered B43511C9477M000.

Application Field

Aluminum electrolytic capacitors are used in power supplies and circuits that require large capacitance at a wide range of operating conditions. This makes them widely used in applications such as amplifier output coupling, screen and DC-link alignment, power factor correction, and power circuiting.

The B43511C9477M000 capacitor in particular is ideal for those applications due to its rated voltage of 450V and its high capacitance of 4700µF. This allows it to be used for high frequency switching power supplies, power factor correction converters, and more. It is especially useful in audio equipment and can be used in a range of sizes from the smallest portable transistor radios to the larger high-end audio amplifiers.

Working Principle

Typical electrolytic capacitors use an electrolytic solution to form an oxide layer on an aluminum foil electrode. This layer acts as an insulator, allowing for a much higher capacitance than a typical capacitor with the same form factor. In the B43511C9477M000, the aluminum foil layer is held in place by a strong plastic body, constructed of a high-grade epoxy resin. The body provides mechanical protection, making it especially advantageous for use in environments with high vibration.

On either side of the capacitor’s foil electrode, two metallic plates are placed to which a voltage is applied. This creates an electrolytic current that establishes an electric field across the oxide layer. As a result, the electrolytic field voltage and capacitance increase. This increase is an important part of providing large capacitance, which then allow sufficient energy storage and filtering.

In terms of the B43511C9477M000, the capacitor will provide a steady source of power, even as the input current fluctuates. This is beneficial, especially for applications using AC currents, as the capacitor can store the energy and then output it when the current drops.

Conclusion

The B43511C9477M000 aluminum electrolytic capacitor is a product with a wide range of uses. Its high capacitance rating and voltage make it ideal for many application where large amounts of power need to be buffered and stored. Its strong construction makes it ideal for applications that require protection from vibration. Finally, its operating principles allow energy to be regulated and stored, making it ideal for applications with fluctuating AC input currents.

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