Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors refer to capacitors whose electrodes are aluminum foil and are electrolytic by aluminum oxide films. Its charge-discharge characteristics are better than other types of capacitors.

ALF40C221DF450 Application Field and Working Principle

The ALF40C221DF450 aluminum electrolytic capacitor has a diameter of 40mm and a height of 22mm, which has a maximum rated voltage of 450V and is widely used in household appliances, lighting, LED and electronic motors. The working principle of this capacitor is that it is composed of two aluminum foils, which are formed after being anodized by an electrolyte, and then wound in a stacking structure with a layer of paper insulation cloth in between, thus completing its production. The negative terminal is passed by the anode aluminum foil and the anodic oxide film. The positive terminal is joined with the cathode aluminum foil, and then the cathode lead wire is connected to complete the electrical connection of the capacitor.

Advantages of Aluminum Electrolytic Capacitors

The capacitance of an aluminum electrolytic capacitor is large and it has excellent charge-discharge characteristics and self-healing performance. It can also be used in high-frequency switching power supplies. The aluminum electrolytic capacitor has a small volume, a large capacity in a small volume, a long service life and low cost. These characteristics make the aluminum electrolytic capacitor superior to traditional capacitors, such as ceramic capacitors.

Disadvantages of Aluminum Electrolytic Capacitors

The aluminum electrolytic capacitor has a relatively low insulation resistance and tends to deteriorate due to leakage over time, so it must be replaced in time. However, its efficiency is much lower than that of a no-load/low-loss capacitor and it has a low reliable temperature. Due to the chemical properties of aluminum electrolytic capacitors, they are generally not suitable for use in high temperature environments (generally less than 105°c).

Conclusion

The ALF40C221DF450 aluminum electrolytic capacitor is widely used in household appliances, lighting, LED and other electronic motors. Its advantages are obvious, but it also has some disadvantages, such as a low insulation resistance and a low reliable temperature. Therefore, when using aluminum electrolytic capacitors, pay attention to the ambient temperature and operational data of the product. In addition, its service life should be replaced in time.