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Home » News » industry information » What is the difference between wound and stacked film capacitors

What is the difference between wound and stacked film capacitors

Views: 3     Author: Site Editor     Publish Time: 2025-01-23      Origin: Site

If we classify film capacitors according to their internal structure, we can divide them into winding structure and stacked structure. If you have not seen the production process of film capacitors, it is probably difficult to imagine what the difference is between them.

The wound type is a structure in which a polymer film is wound and punched, and then placed in a shell. The laminated type is a structure in which multiple layers of polymer films are laminated together, and then the laminate is placed in a shell.

At present, most of the film capacitors are basically wound internal structures. Its advantage is that it is easy to manufacture, and currently wound film capacitors are the most commonly used type.

Laminated film capacitors, such as CL71 correction capacitors, are widely used. However, the production equipment of this type of capacitor is complex and extremely expensive, and the product defect rate is relatively high. It is now gradually being replaced by CL23B wound correction capacitors. True laminated film capacitors are now rarely seen.

The quality of film capacitors is closely related to the quality of the film material, but not to the internal structure.

The process flow of film capacitors can be simply summarized as follows: a layer of metallized film is evaporated on the base film, and then the metallized film is cut and wound according to certain specifications, and then the leads are welded at both ends and installed in the shell. The thickness, material, and pattern of the metallized film determine the electrical characteristics and life of the film capacitor, so the metallized film is the decisive indicator for determining the performance of the film capacitor.

The prices of film capacitors on the market vary greatly. To put it bluntly, the core is the difference in raw materials. If the raw materials used are extremely poor, the unit price is indeed very low, but the quality of the film capacitor is very poor and the life is very short. It can be understood that film capacitors also get what you pay for. If the unit price is too low, the manufacturer cuts corners to achieve it.


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