JPH0364904A - Wound type capacitor - Google Patents

Abstract

PURPOSE:To compose two composite capacitors in an integrally wound capacitor by a method wherein a zigzag series structure of electrode thin layer is arranged in longitudinal direction of a dielectric sheet, and an electrode lead-out part is provided on the electrode thin film at the intermediate part, as a common electrode lead-out part, in addition to the electrode lead-out part provided on the starting and the terminal electrode thin films. CONSTITUTION:Electrode thin layers 12a to 12d are provided in the winding direction of dielectric sheets 10 and 11 with prescribed intervals, and opposing to the above-mentioned layers 12a to 12d, electrode thin layers 13a to 13c having layer and outer margins 14 and 15 are arranged in zigzag, then a capacitor is wound around above-mentioned sheets and layers. Lead terminals 16 and 18 are led out from the starting end and intermediate thin layers as external electrode leads A, B and C, and a 4-series capacitor is formed between A and C, and besides, a lead terminal 17 is led out from a terminal electrode thin layer, and a 2-series capacitor is formed between B and C. As above-mentioned, the electrode lead C performs the function as a common terminal, and two capacitors are formed between A-C and B-C in an integrally constructed wound capacitor.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to wound capacitors used for relatively high voltages.

2. Description of the Related Art Series capacitors are already known as high-voltage capacitors, which are made by winding a pair of dielectric materials in which a plurality of electrodes are arranged at predetermined intervals so that some of the electrodes overlap with each other so that the electrodes partially face each other. .

FIG. 4 shows a conventional electrode configuration. The thin electrode layers 3.4 of the dielectric sheet 1 and the dielectric sheet 2, each of which has a plurality of band-shaped metal layers arranged with a predetermined insulation margin 5.6.7 in the width direction of the dielectric sheet, are arranged in a staggered manner. Both end surfaces 8 of capacitor elements are overlapped so as to be combined and wound for a predetermined length.
A series type capacitor is used in which metal is sputtered 9 and a lead is connected to the capacitor. Since this capacitor is used at a relatively high voltage, it is molded with resin, impregnated with resin, or impregnated with an insulating agent (insulating oil, wax, etc.), and sealed in a case. FIG. 5 shows a cross-sectional view (a) in the width direction of a dielectric sheet of the conventional series capacitor shown in FIG. 4, and (b) an equivalent circuit of the capacitor.

As the dielectric sheet, a plastic film made of polypropylene, polyester, polystyrene, polyphenylsulfone, polyimide, etc. or insulating paper is used.

Problems to be Solved by the Invention The above-mentioned capacitors are used as parts for electronic equipment, industrial equipment, etc., and the need for a plurality of capacitors for the same equipment is increasing. Generally, capacitors with different ratings (voltage, capacitance) are often used. However, if the capacitors having the above structure have different rated voltages, it is necessary to change the number of electrode metal layers 3.4 arranged in series on the dielectric sheet, and there are many types of dielectric sheets.

Furthermore, although each capacitor is built into a resin mold, etc., the accommodating rate (space factor) is poor,
This has the disadvantage of increasing dead space.

Means for Solving the Problems In order to solve the above problems, a staggered series arrangement of electrode thin layers is arranged in the longitudinal direction of the dielectric sheet, and the electrode lead-out portion is common to the starting and terminal electrode thin layers. Two composite capacitors are constructed from a single wound capacitor by extending the electrodes from the thin electrode layer in the middle. By repeating this method, a wound capacitor can be constructed in which a plurality of capacitors are integrally formed into a concentric winding.

That is, (1) a plurality of island-shaped thin electrode layers are arranged in a staggered manner with at least one dielectric sheet sandwiched therebetween, and are spaced apart from each other by a predetermined distance in the longitudinal direction of the dielectric sheet, with some parts facing each other; In the wound capacitor, an electrode lead is taken from one electrode thin layer in the middle in the winding direction among the plurality of electrode thin layers, and this is used as a common electrode lead. A wound type capacitor'b characterized in that an electrode lead is taken out and a second electrode lead is taken out from the thin electrode layer at the end of the winding. ■Metal foil is used as the electrode thin layer, and the electrode is located in the middle in the winding direction. The wound capacitor as described in the above item, wherein the lead and the electrode leads at the start and end of the winding are taken out on opposite sides of the dielectric sheet on one or both sides of the dielectric sheet.

■Use metal foil for the electrode thin layer from which the electrode leads are taken out in the middle in the winding direction, as well as at the start and end of the winding.
This is the wound type capacitor described in item (2) above, in which the other thin electrode layer is a metal vapor-deposited on a dielectric sheet.

Effect: With the capacitor having the above structure, two or more capacitors can be manufactured using a single wound capacitor, and the space factor can be improved. In addition, capacitors with different ratings can be manufactured by adjusting the length of staggered electrode thin layers and the number of series connections.
A light, thin, short, and small capacitor can be obtained without increasing the number of types of thin electrode layers.

Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a wound capacitor according to an embodiment of the present invention,
(a) is an exploded perspective view of the capacitor, (b) is a longitudinal sectional view of the dielectric, (C) is its equivalent circuit, (the inside is a perspective view after winding. Electrode thin layers 12a and +2b spaced apart from each other by a predetermined distance in the winding direction.

12c and 12d, and the electrode thin layer 13 opposite thereto.
a.

13b and f3c are arranged in a staggered manner with a thin interlayer margin 14 and an outer margin 15, respectively, and are wound to form a wound capacitor shown in FIG. (Although the peaks indicate a flat shape, the same applies even if they are cylindrical. In this wound capacitor, the external lead electrode lead A,
As B%C, a lead terminal 16 is drawn out from the starting end electrode thin layer and a lead terminal 18 is drawn out from the intermediate electrode thin layer, forming one 4-series capacitor between A and C. Furthermore, a lead terminal 17 is drawn out from the terminal electrode thin layer, and another two-series capacitor is formed between B and C. In this way, the electrode lead C has a function as a common terminal, and two capacitors, one for AC and one for 80, are formed in a single wound capacitor. Therefore, when manufacturing two capacitors with different ratings, by changing the number of capacitors connected in series between AC and 80, it is possible to make the shared voltage approximately the same, and the capacitance between AC and 80 is An appropriate value can be obtained by adjusting the length of each thin island electrode layer of the capacitor.

In this way, two capacitors can be formed in one wound capacitor.

FIG. 2 shows a wound capacitor according to a second embodiment of the present invention, in which (a) is a sectional view taken in the longitudinal direction of the dielectric, and (c) is its equivalent circuit. Similar to the embodiment shown in FIG. 1, thin electrode layers are arranged in a staggered manner at predetermined intervals in the winding direction of the dielectric sheet 10.11.

The electrode leads for external extraction at the starting end, the terminal end, and the middle part are made of metal foil such as Fulumi foil in which the electrode thin layer 198% 19b% 19c is made. 6 series capacitors between A-0 and 8-
This means that four series capacitors between 0 and 0 are formed into a single wound capacitor.

FIG. 3 shows electrode thin layers 22a to 22c, 23a to 23d arranged in a staggered manner in the longitudinal direction of the dielectric sheet 10.11.
This is a third embodiment of the present invention made of metal foil such as aluminum foil. (a) is a cross-sectional view of the dielectric in the longitudinal direction, 03)
is an equivalent circuit, in which 5 series capacitors between A and 0 and 3 series capacitors between B and 0 are formed into one wound capacitor.

Examples will be specifically described below. In the configuration of the present invention shown in Fig. 2, the capacitor rating between A and 0 is 15kV,
j3000p F, between B and C (7): ] ”
) A capacitor with a capacitor rating of 1Ok V and 2000pF was manufactured. As the dielectric sheet 10.11, a polyester film (length 211 J, m% width 45 mm) is provided with an outer margin 15 of 5 mm, and a metallized film on which aluminum is vapor-deposited is used, and an insulating part at the beginning of winding and at the end of winding,
It is possible to burn off the deposited metal during winding of the lead-drawing intermediate electrode part and the insulation margin of 30 m between each electrode thin layer, and to set the predetermined electrode length of the capacitor with 6 series between 8 and C and 4 series between B and C. can. For the lead extraction electrodes at the starting end, terminal end, and middle part, the leads are welded to aluminum and inserted for a predetermined length.

A cylindrical capacitor was manufactured by winding the dielectric sheet and the electrode layer to a predetermined length around a 4 mm core in series. The size of the completed capacitor is 17 mm in diameter at the end face.
It has a cylindrical shape with a height of 45 mm.

As a comparative example, a conventional capacitor having the same electrode configuration as shown in FIG. 4 will be shown. A polyester film (thickness 21 pm, width 62 nwn) is used as a dielectric sheet, and each edge side electrode layer 3a has a width of 8 mm and a film inner electrode layer 3b.
has a width of 141TIITl, and a width of insulation margin 5 of 6m.
A metallized film 1 on which aluminum was deposited was used, separated by m.

One of the dielectric sheets 2 is a polyester film (thickness 21 pm, width 60 mm) with three edge margins 7 on each side, and an electrode layer 4 with a width of 14 mm on the inside of the film.
A metallized film 2 having a width of 8 nvn and having a margin 6 of 8 nvn and deposited with aluminum was used.

These metallized films 1 and 2 were stacked so that the electrode layers were combined in 6 series in a staggered manner, and wound around a core with a diameter of 4 m.
A 5kV, 6000pF cylindrical capacitor element was manufactured. Zinc was sputtered 9 onto both end surfaces 8 of this capacitor element, and lead leads were connected.

The size of the completed capacitor is 15.
It has a cylindrical shape with 511W11% and a height of 64mm.

Another capacitor with a rating of 10 kV and 2000 pF similarly uses a polyester film (thickness 21 pm, width 42 m) as the dielectric sheet 1, and the edge side electrode layer 3a has a width of 8 ff 1 m and the film inner electrode layer 3b has a width of 14 m.
A polyester film (thickness: 21 pm) was used as the dielectric sheet 2 and the metallized film 1 on which aluminum was vapor-deposited, with a margin width of 8 mm between the metallized film 1 and the dielectric sheet 2.

Width: 40 mm) with a margin 7 on the edge side of 3 mm each, electrode layer 4 with a width of 14 mm on the inside of the film, and a width of F 3 m.
A capacitor element was manufactured by stacking a metalized film 2 on which aluminum was vapor-deposited with a margin 6 of rn so that the electrode layers were combined in four series in a staggered manner, and winding the film to a predetermined length with a core diameter of 4 mm. Zinc was sputtered on both end faces of this capacitor element, and lead leads were connected. The completed capacitor 2 has an end face diameter of 8.0 mm and a height of 44 m.
It became cylindrical.

+5kV, 6000pF and +OkV of the embodiment of the present invention
.

The volume of the 2000p F integrated capacitor is IO,2c
n? On the other hand, the volume of the conventional comparative capacitor is +5kV, 6000pF, 12.1cni, 10k
V, 2000pF is 2.3-, totaling 14.4cni, and the capacitor volume of the configuration of the present invention is significantly reduced.
Furthermore, the number of materials can be reduced.

The capacitors of the above examples and comparative examples were resin cast.
However, the space factor improves.

As described above, the present invention relates to a wound capacitor having a staggered configuration of dielectric sheets in the longitudinal direction and having a feature in the electrode extraction position. The materials and lead structures related to these are not restricted in any way by the above embodiments, and can be designed as desired. Furthermore, the same effect can be obtained even if the number of staggered configurations is other than the above embodiments.

Effects of the Invention As described above, the wound type capacitor of the present invention has a staggered series arrangement of electrode layers arranged in the longitudinal direction of the dielectric sheet, and has an electrode lead-out as a common lead-out electrode with the starting end and end electrode layers. By drawing out the electrodes from the electrode layer at the end, one capacitor is formed between the start electrode and the intermediate electrode lead terminal, and another capacitor is formed between the end electrode and the intermediate electrode lead terminal.

These two capacitors become an integrated wound capacitor,
It is industrially useful because it can be made lighter, thinner, and smaller by greatly reducing the volume and improving the space factor for incorporating a capacitor.

[Brief explanation of drawings]

Figure 1 shows one embodiment of the capacitor of the present invention, (a) is a perspective view of the electrode configuration, Φ) is a sectional view of the electrode configuration, (C) is an equivalent circuit, (d) is a perspective view after winding, Figures 3 and 3 show other embodiments of the capacitor of the present invention, in which (a) is a sectional view of the electrode structure, (the crests are equivalent circuits, and Figure 4 is an exploded perspective view of the conventional structure).
FIG. 5(a) is a partially enlarged sectional view of the capacitor in FIG. 4;
(middle) is its equivalent circuit. 0.11: Dielectric sheet 2ax 12bs 100% 12d: Electrode thin layer 3a
, 13b, 13c: Electrode thin layer 4: Thin interlayer margin 15: Outer margin 6.17.18: Lead terminal 9ab 19b, 19c: Metal deposited layer

Claims (1)

[Claims] At least one dielectric sheet is sandwiched between the dielectric sheets, and a plurality of island-like thin electrode layers spaced apart from each other at predetermined intervals in the longitudinal direction of the dielectric sheets are arranged and wound in a staggered manner so that some of them face each other. In the capacitor, an electrode lead is taken from one electrode thin layer in the middle in the winding direction among the plurality of electrode layers, and this is used as a common electrode lead, and a first electrode lead is taken from the electrode thin layer at the beginning of the winding. A wound capacitor characterized in that a second electrode lead is taken out from a thin layer of a wound end electrode.