JPH10135075A - Capacitor and its external connecting terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a capacitor with a parallel connection structure which enables reduction of inside inductance and its external connecting terminal. SOLUTION: Erach capacitor element 11 is connected parallel by a first lead 17, which mutually connects one electrode 12a of each capacitor element 11 arranged parallel and leads to one side of a terminal and a second lead 18 which mutually, connects the other electrode 12b, going over to the side of an electrode 122a from a lower end and leads to the other side of a terminal along the first lead 17. Thereby, mist of the magnetic field generated by a current flowing to the first lead 17 and the second lead 18 is canceled, and magnetic energy thereof is reduced, thus greatly reducing inside inductance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor formed by electrically connecting a plurality of capacitor elements in parallel and a terminal for external connection thereof, and more particularly to a capacitor having a reduced internal inductance.

[0002]

2. Description of the Related Art A capacitor used in various electric circuits such as a power system and a distribution system is generally composed of a plurality of capacitor elements.
These capacitor elements are appropriately connected in parallel or in series according to the electrical specifications of the capacitor such as its capacity and voltage.

FIG. 14 shows a structure relating to a capacitor of a relatively low voltage, in which a plurality of capacitor elements are connected in parallel. FIG. 1 (1) is a perspective view thereof, and FIG.
Is a side view thereof. In the figure, reference numeral 1 denotes a capacitor element formed by winding a metal vapor-deposited film, for example, and electrodes 2 are formed at both ends in the axial direction (the front-rear direction in FIG. 1A) by spraying solder or the like (metallicon). . The capacitor element 1 has four rows in the horizontal direction and five rows in the vertical direction.
The columns are arranged parallel to each other.

[0004] Reference numeral 3 denotes a capacitor element 1 for two horizontal rows and five vertical rows.
Are electrically connected to each other, and are connected to the electrodes by, for example, soldering. Reference numeral 4 denotes a conductor for connecting each of the copper foils 3 to a terminal mounted through a case (not shown).

[0005] As shown in the figure, the conventional parallel connection structure is as follows.
The electrodes 2 formed at both ends in the axial direction of the capacitor element 1 are
They were connected to each other by copper foils 3, and furthermore, lead wires 4 were drawn out from the upper end of each copper foil 3, and these lead wires 4 were connected in parallel for each polarity to terminals. This connection structure
Although there is an advantage that the structure itself is simplified, the internal inductance as a capacitor tends to increase. A capacitor is not limited to a filter, but a current of a high frequency component often flows from the beginning. Therefore, the value of the internal inductance may adversely affect the performance as a capacitor and operating conditions.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a capacitor having a parallel connection structure capable of reducing its internal inductance and a terminal for external connection. I do.

[0007]

According to a first aspect of the present invention, there is provided a capacitor in which respective capacitor elements are arranged in parallel, one of the electrodes of each of the capacitor elements is electrically connected to each other, and led out from one end in the arrangement direction. A first conductor reaching one of the terminals and the other of the electrodes of the respective capacitor elements are electrically connected to each other, and a second conductor derived from the other end in the arrangement direction and reaching the other of the terminals is provided. Things.

According to a second aspect of the present invention, in the capacitor according to the first aspect, the first conductor is electrically connected to one of the electrodes of each capacitor element and is derived from one end of the capacitor element in the arrangement direction. The first conductor leads to one of the terminals, and the second conductor is electrically connected to the other of the electrodes of each of the capacitor elements and is led out from the other end in the arrangement direction. A second lead extends from one end of the arrangement direction to the other of the terminals along the first lead over one side.

According to a third aspect of the present invention, there is provided a capacitor according to the first or second aspect, wherein a pair of bipolar terminals is mounted so as to penetrate a case accommodating the capacitor element, and an end of a lead wire connected to each terminal. Crimp terminal attached to the part, a fastener for tightening and fixing the crimp terminal to each terminal, and both ends of the crimp terminal are fixed to the two terminals together with the crimp terminal by the fastener so that the two terminals are bridged. In addition, an insulating plate is provided which reinforces electrical insulation between the crimp terminals with a protrusion formed by bending substantially the center thereof.

According to a fourth aspect of the present invention, in the first aspect, the first conductor extends in a direction in which the capacitor elements are arranged, and one of the electrodes of each of the capacitor elements is electrically connected to each other. A first electrode plate, and a first lead conductor extending from one end of the first electrode plate in the arrangement direction to one of the terminals, and the second conductor extends in the arrangement direction and is connected to each of the capacitor elements. A second electrode plate for electrically connecting the other of the electrodes to each other, a folded conductive plate extending from the other end of the second electrode plate in the arrangement direction to one end in the arrangement direction, and the arrangement of the folded conductive plate A second lead conductor extends from one end in the direction to the other of the terminals, and the first and second electrode plates and the folded conductive plate face each other in parallel.

A capacitor according to a fifth aspect of the present invention is the capacitor according to the fourth aspect, wherein the first electrode plate and the second electrode plate are opposed to each other in parallel.

According to a sixth aspect of the present invention, in the capacitor according to the fourth aspect, the width of the first electrode plate is gradually reduced from one end to the other end in the arrangement direction of the capacitor elements.
The width of the electrode plate is gradually increased from one end to the other end in the arrangement direction, and the two electrode plates are disposed on the same surface with a predetermined gap.

A capacitor according to claim 7, wherein the capacitor elements are arranged in two rows in parallel, a series connection conductor electrically connecting one of the electrodes of the two rows of capacitor elements, and the two rows of capacitors. A first electrode plate extending in the arrangement direction between the elements and electrically connecting the other of the electrodes of one of the capacitor elements in the two rows to each other; and one end of the first electrode plate in the arrangement direction. A first conductor comprising a first lead conductor reaching one of the terminals and the other of the electrodes of the other capacitor elements of the two rows extending in the arrangement direction between the two rows of capacitor elements. A second electrode plate electrically connected to the second electrode plate, a folded conductive plate extending from the other end in the arrangement direction of the second electrode plate to one end in the arrangement direction, and the terminal from one end in the arrangement direction of the folded conductive plate. Second drawer leading to the other of Those having a second conductor made of a.

In the capacitor according to the eighth aspect, the plurality of capacitor elements are divided into a plurality of groups according to any one of the first to seventh aspects, and the first and second capacitors are provided for each of the groups.
These capacitor elements are connected in parallel by using the above conductor.

According to a ninth aspect of the present invention, there is provided a capacitor according to the eighth aspect, wherein the groups are arranged in parallel such that the axial directions of currents flowing through the capacitor elements are opposite to each other in adjacent groups. It is.

According to a tenth aspect of the present invention, there is provided a capacitor according to any one of the fourth to ninth aspects, wherein the first and second lead-out conductors are band-shaped, and both lead-out conductors are opposed to each other in parallel. is there.

According to the eleventh aspect of the present invention, the external connection terminal of the capacitor has a plurality of bolts as center conductors, and the plurality of bolts are attached at predetermined intervals to one surface of a case for housing the capacitor element such that the bolts are parallel to each other. Terminals, a plurality of holes are formed corresponding to the mounting positions of the plurality of terminals,
A laminated conductive plate composed of a plurality of terminal conductive plates laminated with an insulating plate interposed therebetween, and each terminal and the laminated conductive plate screwed into each of the bolts inserted through each hole of the laminated conductive plate. A plurality of holes in the terminal plate, each having a small diameter smaller than the diameter of the fastener and a large diameter larger than the predetermined diameter. The terminal conductive plate and the terminal through which the bolt is inserted through the small-diameter hole are electrically connected, and the terminal conductive plate and the terminal through which the bolt is inserted through the large-diameter hole are electrically insulated. Things.

According to a twelfth aspect of the present invention, the terminal for external connection of the capacitor according to the eleventh aspect is such that one of the terminal conductive plates has a small diameter and the other has a large diameter.

The terminal for external connection of the capacitor according to the thirteenth aspect is the same as the eleventh or twelfth aspect,
A plurality of terminal conductive plates are electrically connected to the individual terminals.

According to a fourteenth aspect of the present invention, the number of the external connection terminals of the capacitor according to any one of the eleventh to thirteenth aspects is two, and the first and second terminals from the capacitor element according to the tenth aspect are provided. The positive electrode and the negative electrode are alternately laminated as a terminal conductor, and the positive and negative terminal conductors are connected to one of the terminals, and the negative electrode terminal conductor is connected to the terminal. Each is electrically connected to the other.

According to a fifteenth aspect of the present invention, the external connection terminal of the capacitor according to the eleventh or twelfth aspect is such that the number of the terminals and the number of the terminal conductive plates are both two.
The positive electrode side of the first and second conductor ends from the capacitor element according to any one of claims 10 to 10, to one of the terminal conductive plates,
The negative electrode side is electrically connected to the other of the terminal conductive plates.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a diagram showing a parallel connection structure of capacitors according to Embodiment 1 of the present invention. FIG. 1 (1) is a perspective view thereof, and FIG. 1 (2) is a side view thereof. In the figure, reference numerals 11 and 12a and 12b denote capacitor elements and electrodes formed at both ends in the axial direction thereof, which are equivalent to conventional elements 1 and 2, respectively. Reference numeral 13 denotes one of the six capacitor elements 11 arranged in each column in the vertical direction (FIG. 1 (2)).
The copper foil 14 electrically connects the electrodes 12a on the left end (the left end of FIG. 1) to each other, and the copper foil 14 electrically connects the electrodes 12b on the other end (the right end of FIG. 1B) to each other.
The copper foil extends from one electrode 12b toward the one electrode 12a of the capacitor element 11 and extends along the copper foil 13 to the upper end thereof. Although not shown in FIG. 1, the extended portion of the copper foil 14 is subjected to an insulation treatment as described later.

Reference numeral 15 denotes a conductor drawn from the upper end of the copper foil 13. Conductors 15 from each of a plurality of groups (four in the column of FIG. 1) are connected in parallel to one of terminals (not shown). Is done. Reference numeral 16 denotes a conductor drawn out from the upper end of the extended portion of the copper foil 14. Like the conductor 15, the conductors 16 from each group are connected in parallel with each other and connected to the other terminal (not shown). Then, the first lead wire 17 as a first conductor is formed by the copper foil 13 and the conductor 15, and the second lead wire 1 is formed as a second conductor by the copper foil 14 and the conductor 16.
8, respectively.

As described above, in the parallel connection structure according to the present invention, the extending portions of the copper foil 13 and the copper foil 14 in which the directions of the flowing currents are opposite to each other are arranged close to and parallel to each other, and Since the conductors 15 and 16 connecting between the first and second lead wires 17 and 16 are drawn close to each other from the root portion thereof, most of the magnetic field generated by the current flowing through the first lead wire 17 and the second lead wire 18 in the capacitor. Are offset and their magnetic energy is reduced, and the internal inductance is greatly reduced accordingly. Incidentally, when actually measured with a filter capacitor having a rated voltage of 3 KV, the internal inductance of the conventional parallel connection structure shown in FIG.
In contrast to 0 nH, although the parallel connection structure of the present invention shown in FIG. 1 was used, the internal inductance was 150 nH, which proved that the value was significantly reduced to 50% or less.

Next, referring to FIGS. 2 to 7, more specific details of the structure relating to the parallel connection of the capacitor elements 11 and the procedure of the connection work will be described. First, as shown in FIG. 2, a plurality (6) of capacitor elements 11 having electrodes 12a and 12b formed at both ends in the axial direction are arranged in one row in the vertical direction. Then, copper foil (metal tape) is applied to one electrode 12a.
13 is soldered. The length of the copper foil 13 may be the length of six capacitor elements 11 arranged. Next, a copper foil 14 having a length at least twice as long as the copper foil 13 is soldered to the other electrode 12b, and the remaining portion of the copper foil 14 is bent to form a copper foil 1
Pull out to 3 side.

Next, as shown in FIG.
Is insulated from the copper foil 13 through the insulating pipe 19 at the folded portion. Conductors 15 and 16 having a required length are connected to the tips of the copper foils 13 and 14 by soldering. Next, as shown in FIG.
The individual capacitor elements 11 are grouped, an insulating sheet 20 is wrapped around the outer circumference, an insulating pipe 19 is arranged outside the insulating sheet 20, and the two are integrally fixed by an insulating tape 21.

FIG. 4 shows a structure in which a plurality of necessary groups (five groups in the example in the drawing) formed as described above are superposed and arranged, and are tied up with an insulating tape 22 to complete an integrated capacitor element assembly. is there. FIG. 2B shows an arrangement in which the lead portions of the conductors 15 and 16 are alternately located on opposite sides in adjacent groups. That is, when the conductors 15 of each group and the conductors 16 of each group drawn in this structure are connected in parallel to each terminal, the axial direction of the current flowing through the capacitor element 11 of each group becomes mutually opposite between adjacent groups. Reverse. As a result, it was confirmed that a part of the magnetic field formed by these currents was canceled between the groups, so that the internal inductance was further reduced by about 20 to 30 nH as compared with the case where the magnetic fields were arranged in the same direction. However, in the structure of FIG. 4A as well, the same effect can be obtained even if the conductors 15 and 16 are alternately read every other group, and the replaced conductors 15 and 16 are connected in parallel. .

FIG. 5 is a perspective view showing a state in which the capacitor element assembly is housed in a case (not shown).
Both surfaces of the assembly shown in FIG.
3 and tightly tied with an insulating tape 24 to be integrally formed.

Next, the conductor 1 from the capacitor element 11
The connection structure between the terminals 5 and 16 and the terminals will be described with reference to FIGS. In the drawing, reference numeral 25 denotes a top plate of a case for accommodating the capacitor element 11 together with insulating oil, 26a and 26b are terminals for external connection mounted through the top plate 25, and 27a and 27b are lower ends of the terminals 26a and 26b. A fastener consisting of a bolt and a nut integrally formed with
Reference numeral 28b denotes a crimp terminal which is connected by crimping the tip of each of the conductors 15 and 16, and 29 denotes a binding band which bundles the conductors 15 and 16 in the middle thereof.

Reference numeral 30 denotes an insulating plate (press board) which is fastened and fixed to the terminals 26a, 26b by fastening tools 27a, 27b together with the crimp terminals 28a, 28b. Here, the original shape of the insulating plate 30 is a single flat plate as shown in FIG. 7, and holes 31 through which bolts of the fasteners 27a and 27b are inserted are formed in the vicinity of both left and right ends thereof. Further, folds 32 are formed at the center and at both ends. Then, the insulating plate 30 is bent with the fold 32 as shown in the cross section of FIG.
, And are fixedly fastened to the terminals 26a and 26b.

As a result, the central fold 32 protrudes in a V-shape, and this protruding portion of the insulating plate 30
Reinforce the electrical insulation between 8a and 28b. Therefore, the size between the crimp terminals 28a and 28b,
Since the dimension between 6a and 26b can be reduced correspondingly, it is more advantageous for reducing the inductance of the capacitor.
Further, since one insulating plate 30 is used, when tightening the nuts of the fasteners 27a and 27b, the insulating plate 30 is used.
Since there is no rotation, there is also an advantage that the workability of this tightening is improved.

Embodiment 2 FIG. FIG. 8 is a diagram showing a parallel connection structure of capacitors according to Embodiment 2 of the present invention. FIG. 8A is a perspective view showing a state in the middle of assembly, and FIG. FIG. 3 (3) is a perspective view showing a state after assembly. In the figure, 11
Is a capacitor element, six of which are arranged in the vertical direction in the example of the figure, and electrodes 12a,
12b is formed.

Reference numeral 33 denotes, for example, a copper plate having a thickness of 0.3 mm bent into an L-shape, and a short side portion thereof is connected to each capacitor element 11.
A first electrode plate 34 connected to the first electrode 12a by soldering or the like is a first lead conductor extending the long side portion of the upper end of the first electrode plate 33 and leading to a terminal (not shown). Reference numeral 35 denotes a second electrode plate processed into an L-shape that is symmetrical to the first lead conductor 34, and electrically connects the electrodes 12b of the respective capacitor elements 11 to each other by soldering or the like.
Reference numeral 36 denotes a folded conductive plate which is formed by bending a long side portion of the lower end of the second electrode plate 35 and extending, and serves as a second lead conductor 37 from the upper end position of the second electrode plate 35 to a terminal (not shown). Connected to the other of Then, the first conductor 38 is formed by the first electrode plate 33 and the first lead conductor 34, and the second conductor 39 is formed by the second electrode plate 35, the folded conductive plate 36 and the second lead conductor 37. Configure.

FIGS. 8 (1) and 8 (2) show the assembling process when the folded conductive plate 36 is bent by 90 ° from the second electrode plate 35, and FIG. This shows a state in which processing has been finished so that the lead-out conductor 37 of FIG. Although not shown in FIG. 8, the first electrode plate 33 and the second electrode plate 35 are provided between each capacitor element 11 and the first electrode plate 33.
, And between the second electrode plate 35 and the folded conductive plate 36, a 0.8 mm-thick press board is inserted to secure electrical insulation.

As described above, in the parallel connection structure according to the second embodiment of the present invention, the two electrode plates 33 and 35 for connecting the respective electrodes 12a and 12b in parallel are opposed to each other in parallel at a small interval, and The lead to the terminal is made from both ends (upper end, lower end) in the arrangement direction of the capacitor element, and the folded conductive plate 36 drawn out from the lower end of the second electrode plate 35 is also
Since the electrodes 33 and 35 are opposed in parallel at a small interval, the magnetic field generated by the current flowing through these conductive plates is
As compared with the structure shown in the first embodiment, the offset is more reliably canceled, and the internal inductance is further reduced. Further, the current balance between the capacitor elements is further improved, and there is an effect of equalizing heat generation between the capacitor elements. The lead-out conductors 34 and 37 from the capacitor element 11 to the terminals are also configured so that the strip-shaped conductors are opposed in parallel at a narrow interval.
The inductance of this portion is also suppressed to a sufficiently small value. According to the actual measurement results using a model capacitor prototyped with the same rating as described above, the internal inductance was about 60%.
Very low inductance capacitors of nH and 100 nH or less were obtained.

FIG. 9 shows an assembling structure in which a plurality of groups shown in FIG. 8 (three groups in the example in the figure) are connected in parallel. For example, as shown in FIG. The portions of the conductive plates 33, 35, and 36 are covered with an inter-group insulating plate 40 processed into a channel shape (FIG. 2B), and a plurality of groups are arranged side by side (FIG. 3C). The terminal structure for leading the multiple lead conductors 34 and 37 drawn out of the plurality of groups of capacitor elements 11 out of the case of the capacitor in a state of low inductance will be further described later.

Embodiment 3 FIG. 10 shows a parallel connection structure according to Embodiment 3 of the present invention. Parts that are the same as or correspond to those in FIG. 8 are given the same reference numerals. What is different from FIG. 8 is a first electrode plate 33A and a second electrode plate 35A. That is, the width of the first electrode plate 33A gradually decreases from the upper end to the lower end, and the width of the second electrode plate 35A gradually increases from the upper end to the lower end. This corresponds to the magnitude of the combined current of the capacitor elements 11 connected in parallel. Therefore, in this example, the first electrode plate 33A and the second electrode plate 35A are located on the same plane, so that a necessary insulation distance is secured between them in the same plane. I have.

Also in the third embodiment, the folded conductive plate 36, the first electrode plate 33A and the second electrode plate 35A
Are opposed to each other in parallel at a narrow distance, so that the magnetic field generated by the current flowing through these conductors is effectively canceled out, realizing low inductance characteristics, reducing the copper material, and further stacking dimensions of each conductor. And the size of the parallel-connected capacitor can be reduced.

Embodiment 4 FIG. 11 shows a parallel connection structure according to Embodiment 4 of the present invention.
It deals with a structure in which capacitor element groups connected in parallel are connected in series. FIG. 1A is a perspective view showing a state during the assembly, FIG. 2B is a view of the state of FIG. 1A as viewed from above, and FIG. Perspective view (partial illustration of the lower part is omitted) as viewed from above, FIG.
FIG. 4 is a perspective view seen from a direction opposite to (3).

In the drawing, reference numeral 41 denotes a capacitor element in one column arranged in the vertical direction, 42 denotes a capacitor element in the other column also arranged in the vertical direction, and 43 denotes one electrode 41a of both capacitor elements 41 and 42. , 42a are electrically connected to each other, and are connected to the electrodes 41a, 42a by soldering using, for example, a 0.3 mm thick copper plate. 33B has a structure similar to that of the first electrode plate 33 shown in FIG. 8, and electrically connects the other electrode 41b of the capacitor element 41 to each other. Reference numeral 35B has a structure similar to that of the second electrode plate 35 shown in FIG. 8, and electrically connects the other electrode 42b of the capacitor element 42 to each other. Also in this drawing, the illustration of the insulating plate inserted between the conductive plates is omitted.

In the case of the fourth embodiment, in particular, FIG.
(3) As shown in (4), the capacitor element groups 41 and 42 arranged in two rows are connected in series, and the first conductor 38 and the second conductor 38, which are exactly the same as described in the second embodiment (FIG. 8). Since the parallel connection structure using the two conductors 39 is employed, the internal inductance can be greatly reduced, and a one-series capacitor and its parallel connection parts can be shared. A low inductance capacitor can be obtained. Needless to say, a plurality of capacitor elements 41 and 42 shown in FIG. 11 can be arranged in a group and connected electrically in parallel. Further, in FIG. 11, the capacitor elements 41 and 42 arranged in the vertical direction are collectively connected in series by one series connection conductor 43. If they are individually connected in series, the current balance of each capacitor element will be better.

Embodiment 5 FIG. In the above description, the structure in which a plurality of arranged capacitor elements are connected in parallel with low inductance has been described.However, how the conductors from these capacitor elements are drawn out of the case with low inductance may be different from those of the capacitor. This is a very important issue when pursuing low inductance. In the fifth embodiment, a new external connection terminal that solves this problem will be described.

FIG. 12 shows an external connection terminal applied to a usual single-phase capacitor. Two terminals are used to connect a positive conductor and a negative conductor from a capacitor element housed in a case. It is pulled out of the case. FIG. 1 (1) is a side view, FIG. 2 (2) is an exploded perspective view for explaining an assembled state of each part, and FIG. 3 (3) is a sectional view showing one terminal cut in a vertical direction. It is.

In the figure, reference numerals 44a and 44b denote central conductors 46 formed on bolts 45a and 45b of which the lower portions are male threads.
And an insulator 47 having the central conductor 46 inserted therein and having an integral structure made of metallikon or the like. The insulator 47 is penetrated through the top plate 25 of the capacitor case. 48
Numerals 49 and 49 denote a positive electrode terminal plate and a negative electrode terminal plate, respectively, and are formed, for example, using the ends of the first lead conductor 34 and the second lead conductor 37 described with reference to FIG. Reference numeral 50 denotes an insulating plate sandwiched between the two terminal conductive plates 48 and 49, and is fixed together with the terminal conductive plates 48 and 49 by a fastening tool described later. Reference numeral 51 denotes an insulating plate that covers the upper and lower surfaces of the terminal conductive plates 48 and 49, and is integrally fixed to the terminal conductive plates 48 and 49 by fixing means (not shown). Then, a laminated conductive plate 52 is constituted by the terminal conductive plates 48 and 49 and the insulating plates 50 and 51. 53 is a fastening nut screwed with the bolts 45a and 45b, 54 is a spring washer, and 55 is an electrode spacer for adjusting the axial dimension at the time of fastening.
The fastening tool 56 is configured as described above.

Further, as shown in FIG. 12 (2), all of the terminal conductive plates 48, 49 and the insulating plates 50, 51 are formed with holes through which the bolts 45a, 45b are inserted. The diameters are different. That is, first, the terminal conductive plate 48 will be described. A small-diameter hole H1 slightly larger than the diameter of the bolt and smaller than the diameter of the fastener 56 is inserted at the insertion position of the bolt 45b, and tightened at the insertion position of the bolt 45a. Large holes H2 are formed, each having a diameter larger than the diameter of the fastener 56 and capable of securing insulation from the fastener 56. Conversely, in the terminal conductive plate 49, a small-diameter hole H1 is formed at the position of the bolt 45a, and a large-diameter hole H2 is formed at the position of the bolt 45b. A hole H3 having a diameter enough to allow the fastener 56 to pass therethrough is formed in each of the insulating plates 50 and 51.

The holes H having different diameters described above are used.
1, H2, H3 formed terminal conductive plates 48, 49 and insulating plates 50, 51 are laminated in the order shown in the figure,
(53, 54, 55) and integrally tightened to the terminals 44a, 44b. When assembly is complete,
2 (2), in the terminal plate 48, the terminal plate 48 is directly connected to the terminal 44 by tightening with the tightening nut 53 and the spring washer 54 around the small-diameter hole H1.
The terminal conductor plate 48 and the terminal 44b are electrically connected to each other as a result of being pressed into contact with the center conductor 46 of FIG. On the other hand, since the large-diameter hole H2 is formed in the insertion portion of the bolt 45a, the terminal conductive plate 48 and the terminal 44a are electrically insulated. By exactly the same mechanism,
In the terminal conductive plate 49, the terminal conductive plate 49 is pressed into contact with the central conductor 46 of the terminal 44a at a portion where the small-diameter hole H1 is formed, and the terminal conductive plate 49 and the terminal 44a are electrically connected, A large-diameter hole H2 is formed in a portion where the bolt 45b is inserted, so that the terminal conductive plate 49 and the terminal 44b are electrically insulated.

Here, when the small-diameter hole H1 of the terminal conductive plate 49 is tightened, a gap is formed between the terminal conductive plate 49 and the stepped portion of the center conductor 46. By filling the gap, a reliable pressure contact state can be obtained without deforming the terminal conductive plate 49. FIG.
In No. 2, the electrode spacer is not used on the bolt 45b side, but an electrode spacer having a required height is inserted depending on the related dimensions including the center conductor 46 and the like.

As described above, the external connection terminals in the fifth embodiment are strip-shaped lead conductors 34 and 37 derived from the capacitor element in a state where they are opposed to each other in parallel.
Can be directly guided to the terminals 44a and 44b, respectively, while maintaining the shape and the facing state, so that the inductance as a capacitor device can be reduced to a more thorough level. The lead conductors derived from the plurality of groups of capacitor elements described with reference to FIG. 9, and in FIG. 9, six lead conductors including positive and negative leads are derived from the three groups of capacitor elements. By forming the laminated conducting plate 52 in such a manner that six lead conductors are alternately laminated on the positive side, the negative side, the positive side, the negative side... In the same manner as described in FIG. Thus, a low inductance external connection terminal can be realized.

Further, the external connection terminals of the capacitor described with reference to FIG. 12 may be a three-phase capacitor or a single-phase capacitor, for example, when a plurality of terminals are used for each pole due to current capacity and the like. Even when more than two terminals are required, the same method as described above in which the small-diameter hole H1 and the large-diameter hole H2 are combined can be applied.

Embodiment 6 FIG. FIG. 13 shows a modification of the external connection terminal of the capacitor. Here, independent rectangular terminal plates 57, 58 and an insulating plate 59 inserted therebetween are used for the bolts 45a, 45b of the two terminals, and the terminal plate 57, the bolt 45a, and And the terminal conductive plate 58 and the bolt 45b are electrically connected. Then, the plurality of positive conductors 15 from each group of capacitor elements 11 are connected to the terminal conductor 57 and the negative conductor 16 is connected to the terminal conductor 5.
8 are electrically connected to each other by soldering or the like. By employing the above structure, a low inductance external connection terminal can be realized regardless of the shape of the conductor drawn out from the capacitor element.

In the above description, the capacitor element is formed by winding a metal vapor-deposited film. However, the present invention is not limited to this type. The present invention can be widely applied to capacitor elements having electrodes formed at both ends in the direction, and has the same effect. In each of the embodiments except the fourth embodiment, the capacitors having only the parallel connection structure have been described. However, the capacitors in which the capacitor elements in those embodiments are connected in parallel are further connected in series. However, the present invention can be applied to the parallel connection portion as it is, and the same effect can be obtained.

[0052]

As described above, in the capacitor according to the first aspect, each of the capacitor elements is arranged in parallel, and one of the electrodes of each of the capacitor elements is electrically connected to each other so that one end in the arrangement direction is formed. And the other of the electrodes of each of the capacitor elements is electrically connected to each other, and a second conductor derived from the other end in the arrangement direction and reaching the other of the terminals is connected to the first conductor. As a result, the current balance of each capacitor element connected in parallel is improved, and there is an effect of equalizing heat generation between the capacitor elements, and
The internal inductance as a capacitor is reduced.

In the capacitor according to the second aspect, the first conductor is electrically connected to one of the electrodes of each of the capacitor elements and is led out from one end of the capacitor element in the arrangement direction to one of the terminals. And a second conductor electrically connected to the other of the electrodes of each of the capacitor elements and connected to one side of the electrode after being led out from the other end in the arrangement direction. Since the second lead wire extends from the other end in the arrangement direction to the other of the terminals along the first lead wire, the inductance of the lead wire is reduced, and the internal inductance as a capacitor is reduced. I do.

Further, in the capacitor according to the third aspect, a pair of bipolar terminals mounted through the case accommodating the capacitor element, and a crimp terminal mounted at an end of a lead wire connected to each of the terminals. A fastener for fastening the crimp terminal to each terminal, and both ends thereof are fixed to the two terminals together with the crimp terminal by the fastener so as to bridge between the two terminals and to bend substantially the center thereof. Since the insulating plate for providing electrical insulation reinforcement between the crimp terminals is provided by the formed protrusions, the dimensions between the terminals can be reduced and the tightening workability can be improved with a simple structure.

In the capacitor according to the fourth aspect, the first conductor extends in a direction in which the capacitor elements are arranged, and the first electrode electrically connects one of the electrodes of each of the capacitor elements to each other. And a first lead conductor extending from one end of the first electrode plate in the arrangement direction to one of the terminals, and the second conductor extends in the arrangement direction and connects the other of the electrodes of each of the capacitor elements to each other. A second electrode plate electrically connected to the second electrode plate, a folded conductive plate extending from the other end in the arrangement direction of the second electrode plate to one end in the arrangement direction, and a terminal from one end in the arrangement direction of the folded conductive plate to a terminal. Since the first and second electrode plates and the folded conductive plate are made to face each other in parallel with each other, the current balance of each of the capacitor elements connected in parallel is improved. , Body inductance portion is reduced, the internal inductance of the capacitor is reduced.

Further, in the capacitor according to the fifth aspect, since the first electrode plate and the second electrode plate are opposed to each other in parallel, the inductance of the conductor portion is more reliably reduced.

In the capacitor according to the sixth aspect, the width of the first electrode plate is gradually reduced from one end to the other end in the arrangement direction of the capacitor elements, and the width of the second electrode plate is reduced in the arrangement direction. Are gradually increased from one end to the other end, and the two electrode plates are disposed on the same surface with a predetermined gap therebetween. Therefore, it is possible to save the conductive plate material and reduce the size.

In the capacitor according to the seventh aspect, each capacitor element is arranged in two rows in parallel, a series connection conductor for electrically connecting one of the electrodes of each of the two rows of capacitor elements, A first electrode plate extending between the capacitor elements in the arrangement direction and electrically connecting the other of the electrodes of one of the capacitor elements in the two rows to each other;
Of the electrode plate from one end in the arrangement direction to one of the terminals.
And a first conductor extending in the arrangement direction between the two rows of capacitor elements and electrically connecting the other of the electrodes of the other capacitor elements in the two rows to each other. A second conductive plate extending from the other end in the arrangement direction of the second electrode plate and the second electrode plate to one end in the arrangement direction, and a second conductive plate extending from the one end in the arrangement direction of the folded conductive plate to the other of the terminals. Since the second conductor composed of the lead conductor is provided, the parallel connection structure of the capacitor elements, including the partial connection in series, can achieve low inductance with a simple configuration similar to that of the parallel connection only.

In the capacitor according to the eighth aspect, the plurality of capacitor elements are divided into a plurality of groups, and each group is connected in parallel using the first and second conductors for each of the groups. Therefore, a parallel connection structure of a large number of capacitor elements can be easily and simply realized.

In the capacitor according to the ninth aspect, the groups are arranged in parallel such that the axial directions of the current flowing through the capacitor elements are opposite to each other in the adjacent groups. The internal inductance of the connected capacitor can be further reduced.

In the capacitor according to the tenth aspect, the first and second lead conductors are band-shaped,
Since the two lead conductors are opposed to each other in parallel, the inductance of the lead conductor part is effectively reduced.

According to the eleventh aspect of the present invention, in the external connection terminal for a capacitor, a plurality of bolts are provided at predetermined intervals on one surface of a case for housing the capacitor element such that the bolts are parallel to each other and the bolts are parallel to each other. The terminal, a plurality of holes are formed corresponding to the mounting positions of the plurality of terminals, a laminated conductive plate composed of a plurality of terminal conductive plates laminated with an insulating plate interposed therebetween, and each of the laminated conductive plate A fastener for screwing the bolts into the holes and mechanically coupling the terminals and the laminated conductive plate is provided, and a plurality of holes in the terminal conductive plate are formed in accordance with a diameter of the fastener. Each of the terminal conductive plate and the terminal through which the bolt is inserted through the small-diameter hole is electrically connected to each other by configuring the terminal conductive plate and the terminal conductive plate by configuring the terminal conductive plate and the terminal conductive plate with the terminal conductive plate. Bolts are inserted into the large diameter holes Having a terminal to electrically insulate the can reduce the inductance of the connecting portion between the capacitor element and the terminal.

Further, in the terminal for external connection of the capacitor according to the twelfth aspect, the holes of each terminal plate have one small diameter and the other holes have a large diameter. Can realize an external connection terminal of a capacitor having a simple structure in which one terminal is electrically connected.

Further, in the external connection terminal of the capacitor according to the thirteenth aspect, since a plurality of terminal conductive plates are electrically connected to one terminal, the terminal conductive plate can be simply connected. Parallel connection is possible.

Further, in the external connection terminal of the capacitor according to claim 14, the number of terminals is two,
The end portions of the first and second lead conductors from the capacitor element according to the above are alternately laminated as positive and negative electrodes as a terminal conductor as a laminated conductor, and the terminal conductor on the positive electrode side is connected to one of the terminals, Since the negative terminal plate is electrically connected to the other of the terminals, a compact and extremely low-inductance capacitor integrated with the conductor extending from the capacitor element can be obtained.

In the external connection terminal of the capacitor according to the fifteenth aspect, the number of the terminals and the number of the terminal conductive plates are both set to two. Since the positive and negative ends of the first and second conductor ends are electrically connected to one of the terminal conductors, and the negative electrode is electrically connected to the other of the terminal conductors, the shape of the conductor from the capacitor element is reduced. Regardless, a low inductance external connection terminal can be realized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a parallel connection structure of capacitors according to Embodiment 1 of the present invention.

FIG. 2 is a diagram for explaining details of the parallel connection structure of FIG. 1 and a point of a connection operation.

FIG. 3 is a diagram for explaining details of the parallel connection structure of FIG. 1 and a point of connection work;

FIG. 4 is a diagram for explaining details of the parallel connection structure of FIG. 1 and a point of connection work.

FIG. 5 is a diagram for explaining details of the parallel connection structure of FIG. 1 and a point of a connection operation.

FIG. 6 is a diagram showing a connection structure between a conductor and a terminal in the capacitor of FIG. 1;

FIG. 7 is a view showing a prototype of the insulating plate of FIG. 6;

FIG. 8 is a diagram showing a parallel connection structure of capacitors according to a second embodiment of the present invention.

FIG. 9 is a diagram for explaining a point in a case where a plurality of groups of the capacitors of FIG. 8 are arranged in parallel.

FIG. 10 is a diagram showing a parallel connection structure of capacitors according to a third embodiment of the present invention.

FIG. 11 is a diagram showing a parallel connection structure of capacitors according to a fourth embodiment of the present invention.

FIG. 12 is a diagram showing terminals for external connection of a capacitor according to a fifth embodiment of the present invention.

FIG. 13 is a diagram showing external connection terminals of a capacitor according to a sixth embodiment of the present invention.

FIG. 14 is a diagram showing a conventional parallel connection structure of capacitors.

[Explanation of symbols]

11, 41, 42 capacitor elements, 12a, 12b,
41a, 41b, 42a, 42b Electrodes, 13, 14
Copper foil, 15, 16 conductor, 17 first lead, 18
2nd lead wire, 25 top plate, 26a, 26b terminal, 27a, 27b fastening tool, 28a, 28b crimp terminal, 30 insulating plate, 32 folds, 33, 33A, 33
B first electrode plate, 34 first lead conductor, 35, 3
5A, 35B second electrode plate, 36 folded conductive plate, 3
7 Second lead conductor, 38 First conductor, 39 Second conductor
Conductor, 43 series connection conductor, 44a, 44b terminal,
45a, 45b bolt, 48, 49, 57, 58 terminal conductive plate, 50, 59 insulating plate, 52 laminated conductive plate, 56
Fastener, H1 small diameter hole, H2 large diameter hole.

Claims (15)

[Claims] 1. A capacitor formed by electrically connecting a plurality of capacitor elements having electrodes formed at both ends in an axial direction to respective terminals, wherein the capacitor elements are arranged in parallel, and the electrodes of the respective capacitor elements are arranged in parallel. Are electrically connected to each other, and the other of the electrodes of the first conductor and each of the capacitor elements, which are derived from one end in the arrangement direction and reach one of the terminals, are electrically connected to each other. And a second conductor led out from the other end of the capacitor and reaching the other of the terminals. 2. The first conductor comprises a first lead wire which is electrically connected to one of the electrodes of each capacitor element and connected to one end of the capacitor element in the arrangement direction and reaches one of the terminals. The second conductor is electrically connected to the other of the electrodes of each of the capacitor elements and is led out from the other end in the arrangement direction. 2. The capacitor according to claim 1, further comprising a second lead wire extending to the other of the terminals along the first lead wire. 3. A pair of bipolar terminals mounted through a case containing a capacitor element, a crimp terminal mounted on an end of a lead wire connected to each terminal, and the crimp terminal attached to each terminal. A fastening tool for fastening and fixing, and both ends thereof are fixed to the two terminals together with the crimping terminal by the fastening tool, bridging between the two terminals, and the crimping is performed at a protrusion formed by bending substantially the center thereof. 3. The capacitor according to claim 1, further comprising an insulating plate for reinforcing electrical insulation between terminals. 4. A first conductor extending in a direction in which the capacitor elements are arranged, a first electrode plate electrically connecting one of the electrodes of each of the capacitor elements to each other, and a first electrode plate of the first electrode plate. A first lead conductor extends from one end of the arrangement direction to one of the terminals, and a second conductor extends in the arrangement direction and electrically connects the other of the electrodes of the capacitor elements to each other. An electrode plate, a folded conductive plate extending from the other end of the second electrode plate in the arrangement direction to one end in the arrangement direction, and a second lead conductor from one end of the folded conductor plate in the arrangement direction to the other terminal. 2. The capacitor according to claim 1, wherein the first and second electrode plates and the folded conductive plate face each other in parallel. 5. The capacitor according to claim 4, wherein the first electrode plate and the second electrode plate face each other in parallel. 6. The width of the first electrode plate is gradually reduced from one end in the arrangement direction of the capacitor element toward the other end, and the width of the second electrode plate is gradually reduced from one end in the arrangement direction to the other end. 5. The capacitor according to claim 4, wherein said two electrode plates are arranged on the same surface with a predetermined gap therebetween. 7. A capacitor in which a plurality of capacitor elements having electrodes formed at both ends in the axial direction are electrically connected in parallel and connected to respective terminals, wherein each of the capacitor elements is arranged in two rows in parallel. A series connection conductor for electrically connecting one of the electrodes of each of the capacitor elements to each other, and extending in the arrangement direction between the two rows of the capacitor elements and connecting the other of the electrodes of each of the two rows of the capacitor elements to each other. A first electrode plate electrically connected to the first electrode plate, a first lead conductor extending from one end of the first electrode plate in the arrangement direction to one of the terminals, and the two rows of capacitor elements And a second electrode plate extending in the arrangement direction and electrically connecting the other of the electrodes of the other capacitor elements in the two rows to each other, and from the other end of the second electrode plate in the arrangement direction. Extends to one end in the array direction Second consisting of second lead conductor folded conductive plate from the arrangement direction end of the folded conductive plate through to the other of the terminal
A capacitor comprising: a conductor; 8. The method according to claim 1, wherein the plurality of capacitor elements are divided into a plurality of groups, and each of the groups is connected in parallel using first and second conductors. 8. The capacitor according to any one of items 7 to 7. 9. The capacitor according to claim 8, wherein the groups are arranged in parallel such that the axial directions of the current flowing through the capacitor elements are opposite to each other in the adjacent groups. 10. The capacitor according to claim 4, wherein the first and second lead conductors are band-shaped, and the two lead conductors are opposed to each other in parallel. 11. A plurality of terminals having a bolt as a central conductor and mounted at predetermined intervals on one surface of a case accommodating a capacitor element so that the bolts are parallel to each other, corresponding to mounting positions of the plurality of terminals. A plurality of holes are formed, and a laminated conductive plate composed of a plurality of terminal conductive plates laminated with an insulating plate interposed therebetween, and screwed into each of the bolts inserted through each hole of the laminated conductive plate. A fastener for mechanically coupling the terminals and the laminated conductive plate to each other, and a plurality of holes in the terminal conductive plate are respectively provided with a small diameter smaller than a diameter of the fastener and a large diameter larger than a predetermined size. The terminal conductor plate and the terminal through which the bolt is inserted through the small-diameter hole are electrically connected, and the terminal conductor plate and the terminal through which the bolt is inserted through the large-diameter hole are configured. Of a capacitor that electrically insulates External connection terminal. 12. A hole of each terminal conductive plate has one small diameter,
The terminal for external connection of a capacitor according to claim 11, wherein the other has a large diameter. 13. A terminal according to claim 1, wherein a plurality of terminal conductive plates are electrically connected to one terminal.
13. A terminal for external connection of the capacitor according to 1 or 12. 14. The number of terminals is set to 2, and the ends of the first and second lead conductors from the capacitor element according to claim 10 are alternately laminated as positive and negative electrodes as terminal conductors to form a laminated conductor. 2. The terminal conductor plate on the positive electrode side is electrically connected to one of the terminals, and the terminal conductor plate on the negative electrode side is electrically connected to the other of the terminals.
14. A terminal for external connection of the capacitor according to any one of 1 to 13. 15. The positive electrode side of the first and second conductor ends from the capacitor element according to claim 1, wherein the number of terminals and the number of terminal conductive plates are both two. The terminal for external connection of a capacitor according to claim 11 or 12, wherein a negative electrode side is electrically connected to one of the terminal conductive plates, respectively, to the other of the terminal conductive plates.