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A759MS686M1JAAE047 application field and working principle

Aluminum-polymer capacitors offer many advantages over other types of capacitors, making them a popular choice in many applications. Their two main types are wet and dry capacitors, each of which offers distinct advantages and disadvantages.

Uses

Aluminum-polymer capacitors are used in a variety of applications, ranging from electronic circuit boards to audio speakers and more. Because of their high capacitance per area, they can be used in devices that need to store electrical charge but are too small to be equipped with larger, conventional capacitors. They are also used in power conversion and conditioning, signal processing, semiconductor processing, and dc-dc power supplies.

Composition

Aluminum-polymer capacitors are constructed using a number of layers of polymeric and metallic materials. The polymeric substrate provides mechanical integrity and dielectric insulation, while a layer of aluminum foil provides the electrical connection between the two. An electrolyte is then used to bridge the gap between the capacitor\'s poles and is typically liquid, but in some applications can be solid. On the outside, the entire device is sealed in an insulating polymer film, typically PET or PEN.

Working Principle

The working principle of an aluminum-polymer capacitor is similar to that of any other capacitor. At rest, the positive and negative electrodes have an equal number of electrons. When a voltage is applied, an electric field is created between the two electrodes, resulting in a redistribution of charges. This redistributes electrons from one plate to the other, resulting in an electrical field and storing energy in the capacitor.

Advantages

Aluminum-polymer capacitors offer several advantages over other types of capacitors, including lower series resistance and inductance, a wide temperature range, low ESR, and high reliability. They are also smaller and lighter than other types of capacitors, making them ideal for portable applications. Furthermore, they are relatively easy to manufacture, making them cheaper than other types.

Disadvantages

Aluminum-polymer capacitors have some notable drawbacks. For example, they tend to be more expensive than other types of capacitors, and their capacitance can be affected by temperature and humidity. In addition, they are not suitable for applications that require high-frequency current. Finally, they can be sensitive to vibration, making them unsuitable for certain types of industrial applications.

Summary

Aluminum-polymer capacitors offer many advantages over other types of capacitors, making them a popular choice in many applications. They can be used for a wide variety of applications and offer several benefits, such as low series resistance and inductance, wide temperature range, low ESR, and high reliability. However, they are more expensive than other types of capacitors, and their capacitance can be affected by temperature and humidity. Additionally, they are not suitable for applications that require high-frequency current, and they can be sensitive to vibration.

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