JP4967837B2 - Capacitor - Google Patents

Description

  The present invention relates to a capacitor, and is particularly suitable for application to a lead wire structure in a plurality of wound foil electrode capacitor elements connected in parallel.

  In a snubber circuit connected to a semiconductor switching element, a wound foil electrode capacitor element is used in which a plastic film on which metal is vapor-deposited is wound, both ends thereof are sealed with a metallicon, and lead wires are drawn out from the portions. ing. And the internal inductance of the wound foil electrode capacitor element used in the high frequency band is made very small, but the lead wire drawn from both ends of the wound foil electrode capacitor element is composed of a thin single wire As a result, the parasitic inductance of the portion increases.

When the parasitic inductance is increased, the high-frequency characteristics of the wound foil electrode capacitor element are deteriorated, and unnecessary voltage vibration or a jump voltage is generated.
For this countermeasure, Patent Document 1 discloses a lead wire for a wound foil electrode capacitor element by using a ribbon-like conductor having a thickness and a width that are practical in strength and handling as lead wires. A method for reducing the parasitic inductance is disclosed.

FIG. 9B is a side view showing a schematic configuration of a conventional capacitor, and FIG. 9A is a cross-sectional view showing a configuration cut along line D5-D5 in FIG. 9B.
In FIG. 9, four wound foil electrode capacitor elements 1 to 4 are arranged adjacent to each other so that both ends of the wound foil electrode capacitor elements 1 to 4 are aligned on the same plane. The ribbon-shaped conductor 11 is commonly connected to one end of each of the wound foil electrode capacitor elements 1 to 4, and the other end of the wound foil electrode capacitor elements 1 to 4 is ribbon-shaped. The conductor 12 is connected in common.

  Here, the ribbon-shaped conductor 11 is folded back so as to be drawn outward at the outer periphery of the wound foil electrode capacitor elements 1 and 2, and the ribbon-shaped conductor 12 is wound on the wound foil electrode capacitor elements 1 and 2. The ribbon-shaped conductors 11 and 12 are arranged opposite to each other with the film-like insulator 13 interposed therebetween at the folded-back portion of the ribbon-shaped conductor 11.

FIG. 10B is a side view showing another example of the schematic configuration of the conventional capacitor, and FIG. 10A is a cross-sectional view showing the configuration cut along line D6-D6 in FIG. 10B.
In FIG. 10, the wound foil electrode capacitor elements 5 to 8 having a semicircular part and a flat part in the outer peripheral part are provided by compression molding the wound foil electrode capacitor elements 1 to 4 of FIG. It has been.

  The four wound foil electrode capacitor elements 5 to 8 are arranged adjacent to each other so that both end portions of the wound foil electrode capacitor elements 5 to 8 are aligned on the same plane. The ribbon-shaped conductor 11 is commonly connected to one end of each of the wound foil electrode capacitor elements 5 to 8, and the other end of each of the wound foil electrode capacitor elements 5 to 8 is ribbon-shaped. The conductor 12 is connected in common.

Here, the ribbon-shaped conductor 11 is folded back so as to be drawn outward at the outer peripheral portions of the wound foil electrode capacitor elements 5 and 6, and the ribbon-shaped conductor 12 is wound on the wound foil electrode capacitor elements 5 and 6. The ribbon-shaped conductors 11, 12 are arranged to face each other via the film-like insulator 13 at the folded-back portion of the ribbon-shaped conductor 11.
JP 59-217318 A

  However, in the structure of the lead wire in the wound foil electrode capacitor elements 1 to 4 in FIG. 9, from the wound foil electrode capacitor elements 3 and 4 toward the wound foil electrode capacitor elements 1 and 2, Since both ribbon-shaped conductors 11 and 12 are routed, in the current path from the terminal portion of the lead wire connected to the external cable to the wound foil electrode capacitor elements 1 to 4, the wound foil Since the electrode capacitor elements 3 and 4 are longer than the wound foil electrode capacitor elements 1 and 2, a difference occurs in the parasitic inductance.

  For this reason, there is no particular problem in the use state of frequencies up to about several tens of kHz. However, when the operating frequency is higher than 100 kHz, the impedance due to the difference in parasitic inductance between the wound foil electrode capacitor elements 1 to 4 is ignored. become unable. For this reason, the current concentrates on the wound foil electrode capacitor elements 1 and 2 side where the impedance is reduced, and the current flows through the wound foil electrode capacitor elements 3 and 4 disposed at a position far from the terminal portion of the lead wire. Therefore, the imbalance of the current flowing between the wound foil electrode capacitor elements 1 and 2 and the wound foil electrode capacitor elements 3 and 4 increases. This causes abnormal overheating and deterioration of the wound foil electrode capacitor elements 1 and 2 where current is concentrated, and in the worst case, there is a problem of causing destruction due to burning or overcurrent.

There is a similar problem in the structure of the lead wires in the wound foil electrode capacitor elements 5 to 8 in FIG.
Accordingly, the object of the present invention is to reduce the parasitic inductance of the lead wire of these wound foil electrode capacitor elements while reducing the current imbalance between the wound foil electrode capacitor elements connected in parallel. It is to provide a capacitor that can be used.

In order to solve the above-described problem, according to the capacitor of claim 1 , a plurality of wound foil electrode capacitor elements that are compression-molded so that the shape of the outer peripheral portion has a semicircular portion and a flat portion , such that said plurality of windings shaped foil electrodes capacitor element is connected in parallel, is connected in common to one end of said plurality of windings shaped foil electrodes capacitor element of the winding-type foil electrodes capacitor A first ribbon-like conductor drawn out from one end as a lead wire in a direction away from the wound foil electrode capacitor element so as to be drawn along the outer periphery; and the plurality of windings The coiled foil electrode capacitor elements are connected in common to the other end of the plurality of coiled foil electrode capacitor elements, and are connected to the first ribbon-shaped conductor as the lead wires. To face each other And a second ribbon-shaped conductor which is drawn, the second ribbon-shaped conductor, the connection position to the one end of the plurality of windings shaped foil electrodes capacitor element of said first ribbon conductor And connected to the other end of the plurality of wound foil electrode capacitor elements in a direction opposite to the direction of the wire, and after being folded back so as to be parallel to the connection surface which is the connected portion, By facing the first ribbon-shaped conductor as a line, the current path on the first ribbon-shaped conductor from the drawing point of the first ribbon-shaped conductor is more than that of the other wound foil electrode capacitor elements. For a wound foil electrode capacitor element connected to a long position, the current path on the second ribbon-shaped conductor from the drawing point of the second ribbon-shaped conductor is another wound foil electrode capacitor element. Shorter than It is connected to a further, between the connecting surface and the folded portion of the second ribbon-shaped conductor, is interposed a portion of the one film-shaped insulator, the first ribbon-shaped conductor Another portion of the one film-like insulator is interposed between the lead wire and the lead wire of the second ribbon-like conductor .

  As described above, according to the present invention, since one of the two ribbon-shaped conductors used as the lead wire is folded back, the current path from the drawing point of one ribbon-shaped conductor is short. For the wound foil electrode capacitor element, the current path from the drawing point of the other ribbon-shaped conductor can be lengthened. For this reason, even when a ribbon-like conductor is used as a lead wire, the difference in parasitic inductance between the wound foil electrode capacitor elements can be reduced, and a plurality of wound foil electrode capacitor elements connected in parallel It is possible to reduce the parasitic inductance of the lead wire of these wound foil electrode capacitor elements while reducing the current imbalance between them. While being suppressed, it is possible to prevent the wound foil electrode capacitor element from being burned out or broken due to overcurrent.

Hereinafter, a capacitor according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1B is a side view showing a schematic configuration of the capacitor according to the first embodiment of the present invention, and FIG. 1A is a cross-sectional view showing a configuration cut along line D1-D1 in FIG. It is.
In FIG. 1, four wound foil electrode capacitor elements 1 to 4 are arranged adjacent to each other so that both ends of the wound foil electrode capacitor elements 1 to 4 are aligned on the same plane. The ribbon-shaped conductor 11 is commonly connected to one end of each of the wound foil electrode capacitor elements 1 to 4, and the other end of the wound foil electrode capacitor elements 1 to 4 is ribbon-shaped. The conductor 12 'is connected in common.

  Here, the ribbon-shaped conductor 11 is arranged from the wound foil electrode capacitor elements 3 and 4 toward the wound foil electrode capacitor elements 1 and 2, and the outer periphery of the wound foil electrode capacitor elements 1 and 2. It is folded so as to be pulled out in the outward direction at the part. The ribbon-shaped conductor 12 ′ is arranged in the direction from the wound foil electrode capacitor elements 1 and 2 to the wound foil electrode capacitor elements 3 and 4, and then the wound foil electrode capacitor elements 1 to 4. So that the winding foil electrode capacitor elements 3 and 4 are folded back along the outer periphery of the winding foil electrode capacitor elements 3 and 4 so as to be routed along the outer periphery of the winding foil electrode capacitor elements 1 and 2. The ribbon-like conductor 11 is extended to the lead-out portion, and the ribbon-like conductor 11 is disposed so as to face the ribbon-like conductor 11 through the film-like insulator 13 at the folded-back portion.

In the wound foil electrode capacitor elements 1 and 2, the A1 portion of the ribbon-like conductor 11 → the A2 portion of the ribbon-like conductor 11 → the wound foil electrode capacitor elements 1 and 2 → the B1 portion of the ribbon-like conductor 12 ′. → B2 portion of ribbon-like conductor 12 ′ → B3 portion of ribbon-like conductor 12 ′ → B4 portion of ribbon-like conductor 12 ′ → B5 portion of ribbon-like conductor 12 ′ can flow current.
On the other hand, in the wound foil electrode capacitor elements 3 and 4, the A1 portion of the ribbon-shaped conductor 11 → the A2 portion of the ribbon-shaped conductor 11 → the A3 portion of the ribbon-shaped conductor 11 → the wound foil electrode capacitor elements 3, 4 → A current can flow through a path of B2 portion of the ribbon-like conductor 12 ′ → B3 portion of the ribbon-like conductor 12 ′ → B4 portion of the ribbon-like conductor 12 ′ → B5 portion of the ribbon-like conductor 12 ′.

As a result, in the wound foil electrode capacitor elements 3 and 4, the wound foil electrode electrode corresponding to the longer current path of the A3 portion of the ribbon-shaped conductor 11 than in the wound foil electrode capacitor elements 1 and 2, In the capacitor elements 1 and 2, the current path can be made longer by the B1 portion of the ribbon-shaped conductor 12 ′ than in the wound foil electrode capacitor elements 3 and 4.
For this reason, even when the ribbon-like conductors 11 and 12 'are used as lead wires, the difference in parasitic inductance between the wound foil electrode capacitor elements 1 to 4 can be reduced, and a plurality of them are connected in parallel. While reducing the current imbalance between the wound foil electrode capacitor elements 1 to 4, it is possible to reduce the parasitic inductance of the lead wires of these wound foil electrode capacitor elements 1 to 4. For this reason, while suppressing deterioration of a high frequency characteristic and generation | occurrence | production of an unnecessary voltage vibration, it suppresses that an electric current concentrates on a part of wound foil electrode capacitor elements 1-4, and the wound foil electrode capacitor element 1 It is possible to prevent destruction due to -4 burnout or overcurrent.

2B is a side view showing a schematic configuration of a capacitor according to the second embodiment of the present invention, and FIG. 2A is a cross-sectional view showing a configuration cut along line D2-D2 of FIG. 2B. It is.
In FIG. 2, in addition to the configuration of FIG. 1, a film-like insulator 13 ′ is provided. Here, the film-like insulator 13 ′ includes a connection surface of the ribbon-shaped conductor 12 ′ connected to the wound foil electrode capacitor elements 1 to 4, and the ribbon-shaped conductor 12 that is folded back in parallel with the connection surface. It can be interposed between the folding surface of ′.

  Thereby, even when the ribbon-like conductor 12 ′ is folded back so as to be parallel to the connection surface with the wound foil electrode capacitor elements 1 to 4, the ribbon-like conductor 12 ′ is prevented from contacting at that portion. Since it is possible to prevent the bypass path from being formed in the ribbon-shaped conductor 12 ', the current imbalance between the wound foil electrode capacitor elements 1 to 4 connected in parallel can be reduced. Can be reduced.

FIG. 3B is a side view showing a schematic configuration of a capacitor according to the third embodiment of the present invention, and FIG. 3A is a cross-sectional view showing a configuration cut along line D3-D3 in FIG. It is.
In FIG. 3, wound foil electrode capacitor elements 5 to 8 are provided instead of the wound foil electrode capacitor elements 1 to 4 of FIG. 1. The wound foil electrode capacitor elements 5 to 8 can be compression-molded with the wound foil electrode capacitor elements 1 to 4 of FIG. 1 so that the shape of the outer peripheral portion has a semicircular portion and a flat portion. .

  The four wound foil electrode capacitor elements 5 to 8 are arranged adjacent to each other so that both end portions of the wound foil electrode capacitor elements 5 to 8 are aligned on the same plane. The ribbon-shaped conductor 11 is commonly connected to one end of each of the wound foil electrode capacitor elements 5 to 8, and the other end of each of the wound foil electrode capacitor elements 5 to 8 is ribbon-shaped. The conductor 12 'is connected in common.

  Here, the ribbon-shaped conductor 11 is arranged from the wound foil electrode capacitor elements 7 and 8 toward the wound foil electrode capacitor elements 5 and 6, and the outer periphery of the wound foil electrode capacitor elements 5 and 6. It is folded so as to be pulled out in the outward direction at the part. The ribbon-shaped conductor 12 ′ is arranged from the wound foil electrode capacitor elements 5 and 6 toward the wound foil electrode capacitor elements 7 and 8, and then the wound foil electrode capacitor elements 5 to 8. So that the winding foil electrode capacitor elements 7 and 8 are folded back along the outer peripheral portion of the winding foil electrode capacitor elements 7 and 8 so as to be routed along the outer peripheral portions of the wound foil electrode capacitor elements 5 and 6. The ribbon-like conductor 11 is extended to the lead-out portion, and the ribbon-like conductor 11 is disposed so as to face the ribbon-like conductor 11 through the film-like insulator 13 at the folded-back portion.

In the wound foil electrode capacitor elements 5 and 6, the A1 portion of the ribbon-like conductor 11 → the A2 portion of the ribbon-like conductor 11 → the wound foil electrode capacitor elements 5 and 6 → the B1 portion of the ribbon-like conductor 12 ′. → B2 portion of ribbon-like conductor 12 ′ → B3 portion of ribbon-like conductor 12 ′ → B4 portion of ribbon-like conductor 12 ′ → B5 portion of ribbon-like conductor 12 ′ can flow current.
On the other hand, in the wound foil electrode capacitor elements 7 and 8, the A1 portion of the ribbon-shaped conductor 11 → the A2 portion of the ribbon-shaped conductor 11 → the A3 portion of the ribbon-shaped conductor 11 → the wound foil electrode capacitor elements 7 and 8 → A current can flow through a path of B2 portion of the ribbon-like conductor 12 ′ → B3 portion of the ribbon-like conductor 12 ′ → B4 portion of the ribbon-like conductor 12 ′ → B5 portion of the ribbon-like conductor 12 ′.

As a result, in the wound foil electrode capacitor elements 7 and 8, the wound foil electrode electrodes are made to correspond to the portion of the ribbon-shaped conductor 11 having a longer current path than the wound foil electrode capacitor elements 5 and 6. In the capacitor elements 5 and 6, the current path can be made longer by the B1 portion of the ribbon-shaped conductor 12 ′ than the wound foil electrode capacitor elements 7 and 8.
For this reason, even when the wound foil electrode capacitor elements 5 to 8 are compression-molded, the difference in parasitic inductance between the wound foil electrode capacitor elements 5 to 8 can be reduced, and a plurality of them are connected in parallel. It is possible to reduce the parasitic inductance of the lead wires of these wound foil electrode capacitor elements 5 to 8 while reducing the current imbalance between the wound foil electrode capacitor elements 1 to 4. . For this reason, while suppressing deterioration of a high frequency characteristic and generation | occurrence | production of an unnecessary voltage vibration, it suppresses that an electric current concentrates on some winding foil electrode capacitor elements 5-8, and the winding foil electrode capacitor element 5 ˜8 can be prevented from being burned or destroyed by overcurrent.

FIG. 4B is a side view showing a schematic configuration of the capacitor according to the fourth embodiment of the present invention, and FIG. 4A is a cross-sectional view showing the configuration cut along line D4-D4 of FIG. It is.
In FIG. 4, in addition to the configuration of FIG. 3, a film-like insulator 13 ′ is provided. Here, the film-like insulator 13 ′ includes a connection surface of the ribbon-shaped conductor 12 ′ connected to the wound foil electrode capacitor elements 5 to 8, and the ribbon-shaped conductor 12 folded back in parallel with the connection surface. It can be interposed between the folding surface of ′.

  Thereby, even when the ribbon-like conductor 12 ′ is folded back so as to be parallel to the connection surface with the wound foil electrode capacitor elements 5 to 8, the ribbon-like conductor 12 ′ is prevented from contacting at that portion. Since it is possible to prevent the bypass path from being formed in the ribbon-like conductor 12 ', the current imbalance between the wound foil electrode capacitor elements 5 to 8 connected in parallel can be reduced. Can be reduced.

FIG. 5B is a side view showing a schematic configuration of the capacitor according to the fifth embodiment of the present invention, and FIG. 5A is a cross-sectional view showing the configuration cut along line D5-D5 in FIG. 5B. It is.
In FIG. 5, four wound foil electrode capacitor elements 1 to 4 are arranged adjacent to each other so that both ends of the wound foil electrode capacitor elements 1 to 4 are aligned on the same plane. A ribbon-shaped conductor 11 'is commonly connected to one end of each of the wound foil electrode capacitor elements 1 to 4, and a ribbon is connected to the other end of each of the wound foil electrode capacitor elements 1 to 4. The conductors 12 are connected in common.

  Here, the ribbon-shaped conductor 11 ′ is arranged in the direction from the wound foil electrode capacitor elements 1 and 2 to the wound foil electrode capacitor elements 3 and 4, and then the wound foil electrode capacitor elements 1 to 1. 4 is folded back at the outer periphery of the wound foil electrode capacitor elements 3 and 4 so as to be parallel to the connection surface with the outer periphery of the wound foil electrode capacitor elements 1 and 2 and pulled out outwardly at the outer periphery of the wound foil electrode capacitor elements 1 and 2. It is. The ribbon-shaped conductor 12 is arranged from the wound foil electrode capacitor elements 3 and 4 toward the wound foil electrode capacitor elements 1 and 2, and the outer periphery of the wound foil electrode capacitor elements 1 and 2. The ribbon-shaped conductor 11 ′ is extended to the lead-out portion of the ribbon-like conductor 11 ′, and is disposed opposite to the ribbon-like conductor 11 ′ via the film-like insulator 13 at the folded-back portion of the ribbon-like conductor 11 ′. Yes.

In the wound foil electrode capacitor elements 1 and 2, the A11 portion of the ribbon-shaped conductor 11 ′ → the A12 portion of the ribbon-shaped conductor 11 ′ → the A13 portion of the ribbon-shaped conductor 11 ′ → the A14 portion of the ribbon-shaped conductor 11 ′. The current can flow through the path of the wound foil electrode capacitor elements 1 and 2 → the B12 portion of the ribbon-like conductor 12 → the B13 portion of the ribbon-like conductor 12.
On the other hand, in the wound foil electrode capacitor elements 3 and 4, the A11 portion of the ribbon-shaped conductor 11 ′ → the A12 portion of the ribbon-shaped conductor 11 ′ → the A13 portion of the ribbon-shaped conductor 11 ′ → the wound foil electrode capacitor element 3 4 → B11 portion of the ribbon-like conductor 12 → B12 portion of the ribbon-like conductor 12 → B13 portion of the ribbon-like conductor 12 can flow current.

As a result, in the wound foil electrode capacitor elements 3 and 4, the wound foil electrode electrodes are made to correspond to the portion of the ribbon-shaped conductor 12 where the current path is longer than the wound foil electrode capacitor elements 1 and 2 as compared with the wound foil electrode capacitor elements 1 and 2. In the capacitor elements 1 and 2, the current path can be made longer by the A14 portion of the ribbon-like conductor 11 ′ than the wound foil electrode capacitor elements 3 and 4.
For this reason, even when the ribbon-like conductors 11 ′ and 12 are used as lead wires, the difference in parasitic inductance between the wound foil electrode capacitor elements 1 to 4 can be reduced, and a plurality of them are connected in parallel. While reducing the current imbalance between the wound foil electrode capacitor elements 1 to 4, it is possible to reduce the parasitic inductance of the lead wires of these wound foil electrode capacitor elements 1 to 4. For this reason, while suppressing deterioration of a high frequency characteristic and generation | occurrence | production of an unnecessary voltage vibration, it suppresses that an electric current concentrates on a part of wound foil electrode capacitor elements 1-4, and the wound foil electrode capacitor element 1 It is possible to prevent destruction due to -4 burnout or overcurrent.

6B is a side view showing a schematic configuration of a capacitor according to the sixth embodiment of the present invention, and FIG. 6A is a cross-sectional view showing a configuration cut along line D6-D6 of FIG. 6B. It is.
In FIG. 6, a film insulator 13 ″ is provided instead of the film insulator 13 of FIG. 5. Here, the film-like insulator 13 ″ is interposed between the drawn portions of the ribbon-like conductors 11 ′ and 12, and then the ribbon-like conductor 11 ′ connected to the wound foil electrode capacitor elements 1 to 4. It can be interposed between the connecting surface and the folded surface of the ribbon-like conductor 11 ′ folded so as to be parallel to the connecting surface.

  Thereby, even when the ribbon-shaped conductor 11 ′ is folded back so as to be parallel to the connection surface with the wound foil electrode capacitor elements 1 to 4, it is possible to prevent the ribbon-shaped conductor 11 ′ from coming into contact therewith. Since it is possible to prevent the bypass path from being formed in the ribbon-like conductor 11 ′, the current imbalance between the wound foil electrode capacitor elements 1 to 4 connected in parallel can be reduced. Can be reduced.

7B is a side view showing a schematic configuration of a capacitor according to the seventh embodiment of the present invention, and FIG. 7A is a cross-sectional view showing a configuration cut along line D7-D7 in FIG. 7B. It is.
In FIG. 7, wound foil electrode capacitor elements 5 to 8 are provided instead of the wound foil electrode capacitor elements 1 to 4 in FIG. 5. In addition, the wound foil electrode capacitor elements 5 to 8 can be compression-molded with the wound foil electrode capacitor elements 1 to 4 in FIG. 5 so that the shape of the outer peripheral portion has a semicircular portion and a flat portion. .

  The four wound foil electrode capacitor elements 5 to 8 are arranged adjacent to each other so that both end portions of the wound foil electrode capacitor elements 5 to 8 are aligned on the same plane. A ribbon-shaped conductor 11 'is commonly connected to one end of each of the wound foil electrode capacitor elements 5 to 8, and a ribbon is connected to the other end of each of the wound foil electrode capacitor elements 5 to 8. The conductors 12 are connected in common.

  Here, the ribbon-shaped conductor 11 ′ is arranged from the wound foil electrode capacitor elements 5, 6 toward the wound foil electrode capacitor elements 7, 8, and then the wound foil electrode capacitor elements 5-5. 8 is folded back at the outer peripheral portion of the wound foil electrode capacitor elements 7 and 8 so as to be parallel to the connection surface with the outer peripheral surface, and is folded back so as to be drawn outward at the outer peripheral portions of the wound foil electrode capacitor elements 5 and 6. It is. The ribbon-shaped conductor 12 is arranged from the wound foil electrode capacitor elements 7 and 8 toward the wound foil electrode capacitor elements 5 and 6, and the outer peripheral portion of the wound foil electrode capacitor elements 5 and 6. The ribbon-shaped conductor 11 ′ is extended to the lead-out portion of the ribbon-like conductor 11 ′, and is disposed opposite to the ribbon-like conductor 11 ′ via the film-like insulator 13 at the folded-back portion of the ribbon-like conductor 11 ′. Yes.

In the wound foil electrode capacitor elements 5 and 6, the A11 portion of the ribbon-shaped conductor 11 ′ → the A12 portion of the ribbon-shaped conductor 11 ′ → the A13 portion of the ribbon-shaped conductor 11 ′ → the A14 portion of the ribbon-shaped conductor 11 ′. The current can flow through the path of the wound foil electrode capacitor elements 5 and 6 → the B12 portion of the ribbon-like conductor 12 → the B13 portion of the ribbon-like conductor 12.
On the other hand, in the wound foil electrode capacitor elements 7 and 8, the A11 portion of the ribbon-shaped conductor 11 ′ → the A12 portion of the ribbon-shaped conductor 11 ′ → the A13 portion of the ribbon-shaped conductor 11 ′ → the wound foil electrode capacitor element 7 8 → B11 portion of the ribbon-like conductor 12 → B12 portion of the ribbon-like conductor 12 → B13 portion of the ribbon-like conductor 12 can flow current.

As a result, in the wound foil electrode capacitor elements 7 and 8, the wound foil electrode electrodes 7 and 8 are made to correspond to the longer current path of the B11 portion of the ribbon-shaped conductor 12 than in the wound foil electrode capacitor elements 5 and 6. In the capacitor elements 5 and 6, the current path can be made longer by the A14 portion of the ribbon-shaped conductor 11 'than in the wound foil electrode capacitor elements 7 and 8.
For this reason, even when the ribbon-like conductors 11 'and 12 are used as lead wires, the difference in parasitic inductance between the wound foil electrode capacitor elements 5 to 8 can be reduced, and a plurality of them are connected in parallel. While reducing the current imbalance between the wound foil electrode capacitor elements 5-8, it is possible to reduce the parasitic inductance of the lead wires of these wound foil electrode capacitor elements 5-8. For this reason, while suppressing deterioration of a high frequency characteristic and generation | occurrence | production of an unnecessary voltage vibration, it suppresses that an electric current concentrates on some winding foil electrode capacitor elements 5-8, and the winding foil electrode capacitor element 5 ˜8 can be prevented from being burned or destroyed by overcurrent.

FIG. 8B is a side view showing the schematic configuration of the capacitor according to the eighth embodiment of the present invention, and FIG. 8A is a cross-sectional view showing the configuration cut along the line D8-D8 in FIG. 8B. It is.
In FIG. 8, a film insulator 13 ″ is provided instead of the film insulator 13 of FIG. Here, the film-like insulator 13 ″ is interposed between the drawn portions of the ribbon-like conductors 11 ′ and 12, and then the ribbon-like conductor 11 ′ connected to the wound foil electrode capacitor elements 5 to 8. It can be interposed between the connecting surface and the folded surface of the ribbon-like conductor 11 ′ folded so as to be parallel to the connecting surface.

  Thereby, even when the ribbon-like conductor 11 ′ is folded back so as to be parallel to the connection surface with the wound foil electrode capacitor elements 5 to 8, it is possible to prevent the ribbon-like conductor 11 ′ from coming into contact therewith. Since it is possible to prevent the bypass path from being formed in the ribbon-like conductor 11 ', the current imbalance among the wound foil electrode capacitor elements 5 to 8 connected in parallel can be reduced. Can be reduced.

INDUSTRIAL APPLICABILITY The present invention can prevent the wound foil electrode capacitor element from being burned or destroyed due to overcurrent while suppressing deterioration of high frequency characteristics and occurrence of unnecessary voltage oscillation, and is applied to a high frequency circuit such as a snubber circuit. be able to.
For example, a high frequency magnetic field generated by a high frequency alternating current is applied to the object to be heated, and the high frequency magnetic field is generated by an eddy current induced in the object to be heated and an internal resistance of the object to be heated. It can be used as a capacitor for removing a direct current component used in a load resonance circuit, a resonance capacitor, or the like.

In addition, for receiving DC voltage, converting it to high frequency AC voltage internally, transforming it, converting it to DC voltage again, and outputting it, the DC component used for the AC circuit of the high frequency AC link DC stabilized power supply is removed. It can be used as a capacitor, a resonant capacitor, an output smoothing capacitor, or the like.
Furthermore, it can be used as an output smoothing capacitor that stabilizes the output voltage of a DC chopper for boosting, stepping down or stepping up / down that receives DC voltage and converts the DC voltage output by the on / off operation of the switching element. Can do.

FIG. 1B is a side view showing a schematic configuration of the capacitor according to the first embodiment of the present invention, and FIG. 1A is a cross-sectional view showing a configuration cut along line D1-D1 in FIG. It is. 2B is a side view showing a schematic configuration of a capacitor according to the second embodiment of the present invention, and FIG. 2A is a cross-sectional view showing a configuration cut along line D2-D2 of FIG. 2B. It is. FIG. 3B is a side view showing a schematic configuration of a capacitor according to the third embodiment of the present invention, and FIG. 3A is a cross-sectional view showing a configuration cut along line D3-D3 in FIG. It is. FIG. 4B is a side view showing a schematic configuration of the capacitor according to the fourth embodiment of the present invention, and FIG. 4A is a cross-sectional view showing the configuration cut along line D4-D4 of FIG. It is. FIG. 5B is a side view showing a schematic configuration of the capacitor according to the fifth embodiment of the present invention, and FIG. 5A is a cross-sectional view showing the configuration cut along line D5-D5 in FIG. 5B. It is. 6B is a side view showing a schematic configuration of a capacitor according to the sixth embodiment of the present invention, and FIG. 6A is a cross-sectional view showing a configuration cut along line D6-D6 of FIG. 6B. It is. 7B is a side view showing a schematic configuration of a capacitor according to the seventh embodiment of the present invention, and FIG. 7A is a cross-sectional view showing a configuration cut along line D7-D7 in FIG. 7B. It is. FIG. 8B is a side view showing the schematic configuration of the capacitor according to the eighth embodiment of the present invention, and FIG. 8A is a cross-sectional view showing the configuration cut along the line D8-D8 in FIG. 8B. It is. 9B is a side view showing a schematic configuration of a conventional capacitor, and FIG. 9A is a cross-sectional view showing a configuration cut along a line D9-D9 in FIG. 9B. FIG. 10B is a side view showing another example of the schematic configuration of the conventional capacitor, and FIG. 10A is a cross-sectional view showing the configuration cut along line D10-D10 in FIG. 10B.

Explanation of symbols

1-4, 5-8 Capacitor element 11, 11 ′, 12, 12 ′ Ribbon-shaped conductor 13, 13 ′, 13 ″ Film-like insulator

Claims (1)

A plurality of wound foil electrode capacitor elements compression-molded so that the shape of the outer peripheral portion has a semicircular portion and a flat portion ;
Wherein such plurality of winding-shaped foil electrodes capacitor element is connected in parallel, it is connected in common to one end of said plurality of windings shaped foil electrodes capacitor element, one of the winding-shaped foil electrodes capacitor A first ribbon-like conductor drawn out from the end of the winding foil electrode capacitor element as a lead wire so as to be drawn along the outer periphery thereof ;
The plurality of wound foil electrode capacitor elements are connected in common to the other end of the plurality of wound foil electrode capacitor elements, and the first wire is used as the lead wire. A second ribbon-shaped conductor drawn out so as to face the ribbon-shaped conductor,
The second ribbon-shaped conductor has the plurality of windings in a direction opposite to a direction at which the first ribbon-shaped conductor is connected to the one end of the plurality of wound foil electrode capacitor elements. It is connected to the other end of the foil electrode capacitor element, and is folded back so as to be parallel to the connecting surface which is the connected portion, and then opposed to the first ribbon-shaped conductor as the lead wire. And a wound foil electrode capacitor connected to a position where a current path on the first ribbon-shaped conductor is longer than that of the other wound foil electrode capacitor elements from the drawing point of the first ribbon-shaped conductor. The element is connected to a position where the current path on the second ribbon-shaped conductor is shorter than the other wound foil electrode capacitor elements from the drawing point of the second ribbon-shaped conductor ,
Further, a part of one film-like insulator is interposed between the connection surface of the second ribbon-shaped conductor and the folded portion, and the lead wire of the first ribbon-shaped conductor and the A capacitor , wherein another part of the one film-like insulator is interposed between the lead wire of the second ribbon-like conductor .

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