JPS595962Y2 - Wound composite capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rolled composite container using a foil protruding structural element.

As shown in Figure 1, conventional wound-wound composite capacitors of this type have high connection reliability as capacitor elements.
It uses an element with a foil extrusion structure that has low self-inductance.

In the figure, 1 and 2 are electrode foils, and 3 is a dielectric film.

Then, as shown in FIG. 2, for example, two capacitor elements A and B are integrally formed by sandwiching the insulating layer 4 concentrically,
One electrode 1a, 1b on the same end face in each element A, B
A three-terminal capacitor with a shorted circuit was used.

Note that 5 is a winding bobbin.

In this case, in order to minimize the stray capacitance between the opposite terminals 2 a and 2 b, the outer electrode 1 b of the inner element B and the inner electrode 1 a of the outer element A are used as common electrodes, and the element breakdown voltage margin part 6 Electrodes 2 a , 2 at
The stray capacitance generated between the insulating layers 4 has been reduced by increasing the distance between the insulating layers 4.

Therefore, it is necessary to increase the thickness of the insulating layer 4 in inverse proportion to the stray capacitance, which has the drawback of increasing the size in order to reduce the stray capacitance.

The present invention eliminates such conventional drawbacks by providing an auxiliary electrode wider than the common electrode between the inner and outer elements of a concentrically structured wound composite capacitor. It is wound and connected to a common electrode.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 3 is a partially cross-sectional perspective view showing an embodiment of the wound-shaped composite capacitor of the present invention, in which la and lb are outer elements A
, the common side electrode (including the terminal) of the inner element B, 2a is the other electrode (including the terminal) of the outer element A, and 2b is the other electrode (including the terminal) of the inner element B between the A and B elements. An auxiliary electrode 7, which is wider than the common electrode, is provided around the inner element B by at least about one turn, aligned with the end of the common electrode.

In order to insulate the end surface of the auxiliary electrode 7 from the opposite electrodes 2a, 2b, it is safer to cover it with an insulator 8 having the same thickness as the dielectric film 3, for example.

In this way, since the auxiliary electrode 7 acts as a shield, the stray capacitance between the electrodes 2a and 2b can be significantly reduced.

Note that although two elements are used in the embodiment, the same effect can be achieved even if two or more elements are used.

As explained in detail above, in order to reduce the stray capacitance between elements, the present invention only requires shield electrodes between the elements, and if necessary, an insulator on the end surface of the shield electrodes. Since there is no need to increase the dimensions of the capacitor, it is possible to obtain a wound-type composite capacitor that is small and has a small stray capacitance.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional perspective view of a winding isoform foil protruding structural element;
FIG. 2 is a partially sectional perspective view of a conventional wound type composite capacitor, and FIG. 3 is a partially sectional perspective view of the wound type composite capacitor of the present invention. A: outer capacitor element, B: inner capacitor element, la, lb: common electrode,
2a, 2b...electrodes (including terminals), 3...
...Dielectric film, 5... Winding bobbin,
6...margin part, 7...auxiliary electrode,
8...Insulator.

Claims (1)

[Scope of utility model registration request] In a composite capacitor with an n+1 terminal structure, n capacitor elements with an electrode foil protruding structure are formed concentrically, and one electrode of the same end face of the n pieces is short-circuited to form a common electrode.
A wound type composite capacitor in which an auxiliary electrode, which is wider than the common electrode, is wound between each element, and this auxiliary electrode is connected to the common electrode.