UPM1A821MPD

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UPM1A821MPD Application Field and Working Principle

Aluminum electrolytic capacitors, or aluminium electrolytic capacitors (often abbreviated e-caps), are capacitors which use an electrolyte solution as one of their conducting media. The use of inert anodes and pure aluminum foil as the electrodes results in the production of a physical barrier which prevents ion transfer except at the electrodes. This allows for the creation of high capacitance values in a small package size.

Application Field

The UPM1A821MPD is a high-performance general-purpose axial-type solid aluminum electrolytic capacitor designed for long life. It is designed for high current situations, such as switching power supplies, motor drives, and industrial equipment. This type of capacitor is able to bear large ripple current, reaching up to 1.25 times the rated current.

Working Principle

Aluminum electrolytic capacitors have a chemical structure that is composed of two mica sheets sandwiched between multiple aluminum oxide layers and electrolyte. This combination is known as a “sandwich” capacitor. The electrical properties of a capacitor are determined by the size and shape of the aluminum oxide layers, and the thickness of the electrolyte.

The electrolyte solution comprises of two components, an acid and a base, and the ratio of this determines the conductivity of the capacitor. The electrolyte conducts charge by carrying the current from the anode to the cathode. The electrolyte also acts as a dielectric, which means it stores the electric charge and acts as insulation from the electric field within the capacitor.

The two aluminum oxide layers are sandwiched between two mica sheets, also known as the anode and cathode. The anode is usually made of pure aluminum, and the cathode is made of special metal-oxide or conductive plastic. Both electrodes are coated with a thin layer of water-resistant solder to strengthen the connection and aid in the prevention of charge leakage.

Conclusion

The UPM1A821MPD is an axial-type aluminum electrolytic capacitor that is designed for long life in high current situations, such as switching power supplies, motor drives, and industrial equipment. It is capable of handling large ripple currents with an excellent rate of charge and discharge.

The construction of an aluminum electrolytic capacitor includes two mica sheets sandwiched between two aluminum oxide layers. The electrolyte solution is composed of two components, an acid and a base, and its ratio determines the conductivity of the capacitor. The anode is usually made of pure aluminum and the cathode of special metal-oxide or conductive plastic, and both are coated with a water-resistant solder to strengthen the connection and aid in the prevention of charge leakage.

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