The three most common winding methods of film capacitors

For film capacitors, you can’t just look at the appearance. There are three common winding methods inside film capacitors, and different winding methods have a great impact on the performance of the capacitor. Here are some of the most common three types of film capacitors. The winding method, let's learn together.

1. Sensitive winding

This type of film capacitor is relatively small. The so-called inductive winding means that the capacitor has inductance. During production, aluminum foil is generally used as the plate, and the lead wire or lead piece is directly spot-welded during the winding process. On the aluminum foil electrode. The most commonly used inductive film capacitors are polyester capacitors, such as CL11, CH11, and CBB11.

2. Non-inductive winding

Most film capacitors use the non-inductive winding method. The non-inductive here is not completely without inductance, but the inductance is very small and can be ignored. Non-inductive capacitor plates and foil or metalized electrodes (such as CL21, CBB21, MKP21, etc.), after winding, after spraying gold on the end surface or pre-welding, short-circuit the turns of the same plate to allow current to flow. The way is along the width direction of the plate instead of the length direction, which shortens the distance that the current flows through, thereby reducing the inductance and loss of the capacitor.

3. Laminated structure

This is a new type of non-inductive capacitor with superior performance. It basically has no inductance and has better performance than non-inductive capacitors, but it is difficult to produce and the production equipment is expensive.