UPM0J121MDD1TD Capacitors

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Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors, also known as electrolytic capacitors, are a kind of capacitor consisting of two aluminum films with a non-solid electrolyte. Generally, it uses a thin layer of insulating aluminum oxide film formed on the surface of the aluminum foil electrode as the dielectric material of the capacitor, and the electrolyte is used in the form of an ionic conductor wetting the surface of the dielectric. This type of capacitor has a large capacity, and it is widely used in a variety of circuits.

UPM0J121MDD1TD application field and working principle

UPM0J121MDD1TD aluminum electrolytic capacitors, developed based on the characteristics of aluminum electrolyte films, are high-voltage, high-capacity, low-impedance, and long-life products that are most suitable for various types of large circuits. It can be widely used in high-power switch mode power supplies, consumer electronics, telecommunications, automotive and other fields.

The principle of aluminum electrolytic capacitors is based on the physical phenomenon that the electric charge is stored in the form of ions on the surface of the dielectric material, that is, the electrons in the electric field move to the surface to form electric energy, and the energy stored in it is the energy that the capacitor can release. Generally speaking, the high-voltage and large-capacity aluminum electrolytic capacitor has two pole pieces. One of the pole pieces is an electrode foil made of aluminum alloy, and the other is a stainless steel net that is both a lead wire and a fixed pole piece. The physical properties of the electrolyte film determine the capacitance, voltage and other characteristics, and the electrolyte layer is the most important structure of the capacitor.

The aluminum electrodes used in aluminum electrolytic capacitors are generally made of aluminum roll-shaped foils with a certain thickness. The surface of the aluminum foil is usually anodized, and the thickness of the oxide film formed by anodizing and the composition of the electrolyte determine the capacitance and voltage of the capacitor. Dielectric oxide film is a sluggish and fragile structure. It consists of many metal ions, protons and hydrated electrons. In the process of charging and discharging capacitor, a large number of cations are adsorbed on the surface of the anode oxide film, so that the oxide film is formed, which gives the oxide film the particularity of charging and discharging during the working process. The electrolyte used in the capacitor also affects its performance. Generally, there are three kinds of electrolyte, namely aqueous electrolyte, organic electrolyte and solid electrolyte.

When the voltage is applied to the capacitor, the electric field force acts on the surface of the aluminum anode and changes the oxidation state of the aluminum alloy. At the same time, positive ions in the electrolyte are adsorbed on the surface of the oxide film, and the oxide film volume gradually increases, so that the capacitance gradually increases. At the same time, the electrons formed in the electric field are energized. When the capacitor is charged, the positive ions are adsorbed on the surface of the anode, and when it is discharged, the positive ions are released and the capacitance is reduced.

UPM0J121MDD1TD aluminum electrolytic capacitors are divided into two categories according to their capacitance range. The working voltage range of the first kind is between 10 V and 500 V, and the capacitance range is 0.0047 μF ~ 5600 μF; the second type has a working voltage range of 500 V ~ 1500 V and a capacitance range of 2.2μF ~ 4700μF. In addition, the operating temperature of this type of capacitor is -40℃~ +105℃.

The main advantage of UPM0J121MDD1TD aluminum electrolytic capacitors is that because of the large capacitance and low cost, they are often used in large-scale circuits such as power electronics and industry. In addition, UPM0J121MDD1TD aluminum electrolytic capacitors have a long life, up to 10000 to 20000 hours. In addition, the use of UPM0J121MDD1TD aluminum electrolytic capacitors is also very wide, in addition to the energy field, there are also applications in the fields of computers and communication.

In summary, UPM0J121MDD1TD aluminum electrolytic capacitors have wide application fields and good electrical performance, which make them an important part in many electronic products.

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