Film-free method

Film capacitors are becoming more and more widely used in electronics, home appliances, telecommunications, electric power, electrified railways, hybrid vehicles, wind power, solar power, etc. Film capacitors are becoming more and more important. Therefore, it is not only necessary to understand the performance characteristics of the film capacitor, but also to understand its process and manufacturing process.

The inner core of the film capacitor is wound by means of winding, and the non-inductive winding method is one of them. The sensible winding method relative to the non-inductive winding method is generally used on a metal foil capacitor, such as a CL11 polyester capacitor.

A capacitor using an aluminum foil as an electrode is generally used. A capacitor having a sensible winding method is a lead wire drawn directly from the positive and negative electrodes, and a metal film capacitor is a non-inductive winding method. The non-inductive winding method refers to short-circuiting between the turns of the same electrode after the end face is sprayed with gold or after pre-welding. This winding method causes the current flow direction of the film capacitor to follow the width direction of the electrode, not the length of the electrode, which greatly reduces the loss and inductance of the film capacitor.

The effect of the non-inductive winding method on the film capacitor is important, which greatly reduces the loss of the film capacitor and enhances the life of the capacitor.