JP3771977B2 - Capacitor and its external connection terminal - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a capacitor in which a plurality of capacitor elements are electrically connected in parallel and an external connection terminal thereof, and more particularly to a device whose internal inductance is reduced.
[0002]
[Background Art and Problems to be Solved by the Invention]
  Capacitors used in various electric circuits such as power systems and distribution systems are generally composed of a plurality of capacitor elements, and these capacitor elements are appropriately connected in parallel or in series according to the electrical specifications of the capacitors such as capacity and voltage. Will be connected to.
[0003]
  FIG. 14 shows a structure in which a plurality of capacitor elements are connected in parallel to a relatively low voltage capacitor. FIG. 14A is a perspective view thereof, and FIG. 14B is a side view thereof. It is. In the figure, reference numeral 1 denotes a capacitor element formed by, for example, winding a metal vapor-deposited film, and electrodes 2 are formed by spraying solder or the like (metallicon) on both ends in the axial direction (the front-rear direction in FIG. 1). . The capacitor elements 1 are arranged in parallel to each other in four rows in the horizontal direction and five rows in the vertical direction.
[0004]
  Reference numeral 3 denotes a copper foil for electrically connecting the electrodes of the capacitor elements 1 for two horizontal rows and five vertical rows, and is connected to the electrodes by soldering, for example. Reference numeral 4 denotes a conductive wire for connecting each copper foil 3 to a terminal attached through a case (not shown).
[0005]
  As shown in the figure, in the conventional parallel connection structure, the electrodes 2 formed at both ends in the axial direction of the capacitor element 1 are connected to each other by the copper foils 3, and the conductors 4 are connected from the upper ends of the copper foils 3. The lead wires 4 were drawn out and connected to terminals in parallel for each polarity.
  This connection structure has an advantage of simplifying the structure itself, but tends to increase internal inductance as a capacitor. A capacitor is not limited to a filter, and a current of high frequency components often flows from the beginning. Therefore, the value of the internal inductance may adversely affect the performance and usage conditions as a capacitor.
[0006]
  The present invention has been made to solve the above-described problems, and an object thereof is to obtain a capacitor having a parallel connection structure capable of reducing the internal inductance and a terminal for external connection thereof.
[0007]
[Means for Solving the Problems]
  In the capacitor according to claim 1, the capacitor elements are arranged in parallel, and one of the electrodes of the capacitor elements is electrically connected to each other, and is led out from one end in the arrangement direction to reach one of the terminals. A second conductor extending from the other end in the arrangement direction to the other of the terminals, the other of the conductor and the electrode of each capacitor element being electrically connected to each other;,
  The first conductor is formed of a strip-shaped first lead wire that is electrically connected to one of the electrodes of each capacitor element and is led out from one end in the arrangement direction of the capacitor elements and reaches one of the terminals, The second conductor is electrically connected to the other of the electrodes of the capacitor elements and led out from the other end in the arrangement direction, and then crossed to one side of the electrode from the other end in the arrangement direction. It consists of a strip-shaped second lead wire that extends along the first lead wire to the other of the terminals,
In addition, in the portion along the first lead wire and the second lead wire, the both lead wires are arranged so as to face each other in a direction perpendicular to the surface of the rectangular parallelepiped enclosing the plurality of capacitor elements.Is.
[0008]
  Claims2The capacitor according to claim1A pair of bipolar terminals attached through the case containing the capacitor element, a crimp terminal attached to an end of a lead wire connected to each terminal, and the crimp terminal fastened to each terminal. Fastening tool to be fixed, and the crimping terminal at the projecting portion formed by bending both ends of the fastening terminal together with the crimping terminal and the crimping terminal. It is provided with an insulating plate that performs electrical insulation reinforcement between each other.
[0009]
  Claims3The capacitor according toThe capacitor elements are arranged in parallel, one of the electrodes of the capacitor elements is electrically connected to each other, the first conductor leading from one end in the arrangement direction to one of the terminals, and the electrodes of the capacitor elements A second conductor that is electrically connected to each other and led from the other end of the arrangement direction to the other of the terminals,The first conductor extends in the arrangement direction of the capacitor elements, and a first electrode plate for electrically connecting one of the electrodes of the capacitor elements to each other and one end of the first electrode plate in the arrangement direction. Consisting of a first lead conductor from the lead to one of the terminals,the aboveA second conductor extends in the arrangement direction and extends from the other end in the arrangement direction of the second electrode plate to electrically connect the other of the electrodes of the capacitor elements to each other. A folded conductive plate extending to one end in the arrangement direction and a second lead conductor extending from one end of the folded conductive plate to the other of the terminals,1st and above And the second electrode plate are arranged to face each other in parallel with the folded conductive plate.Is.
[0010]
  Claims4The capacitor according to claim3The first electrode plate and the second electrode plate face each other in parallel.
[0011]
  Claims5The capacitor according to claim3The width of the first electrode plate is gradually decreased from one end to the other end in the arrangement direction of the capacitor elements, and the width of the second electrode plate is gradually increased from one end to the other end in the arrangement direction. Both the electrode plates are arranged on the same surface through a predetermined gap.
[0012]
  Claim6According to the capacitor, the capacitor elements are arranged in two rows in parallel, the series connection conductor for electrically connecting one of the electrodes of the capacitor elements in the two rows, and the arrangement between the capacitor elements in the two rows. A first electrode plate extending in the direction and electrically connecting the other of the electrodes of each of the capacitor elements in the two rows, and a first electrode plate extending from one end in the arrangement direction of the first electrode plate to one of the terminals. A first conductor composed of one lead conductor and the other row of capacitor elements extending in the arrangement direction between the two rows of capacitor elements and electrically connecting the other electrodes of the other capacitor elements of the two rows to each other. A second electrode plate, a folded conducting plate extending from the other end in the arrangement direction of the second electrode plate and reaching one end in the arranging direction, and a second extending from the one end in the arrangement direction of the folded conducting plate to the other of the terminals. Second conductor comprising a lead conductor of It is those with a.
[0013]
  Claims7The capacitor according to claim 1 to claim 1.6In any of the above, the plurality of capacitor elements are divided into a plurality of groups, and the capacitor elements are connected in parallel using the first and second conductors for each of the groups.
[0014]
  Claims8The capacitor according to claim7The groups are arranged in parallel so that the axial directions of the currents flowing through the capacitor elements are opposite to each other in the adjacent groups.
[0015]
  Claims9The capacitor according to claim3 to 8In any of the above, the first and second lead conductors are strip-shaped, and both lead conductors are opposed to each other in parallel.
[0016]
  Claim10The external connection terminal of the capacitor according to the present invention includes a plurality of terminals attached to a surface of a case having a bolt as a central conductor and housing the capacitor element so that the bolts are parallel to each other at a predetermined interval. A plurality of holes are formed corresponding to the mounting positions of the laminated conductor plate, which is composed of a plurality of terminal conductor plates laminated with an insulating plate interposed therebetween, and each of the above-mentioned laminated conductor plates inserted through each hole. A fastening tool that is screwed into a bolt to mechanically connect each of the terminals and the laminated conductive plate is provided, and each of the plurality of holes of the terminal conductive plate has a small diameter smaller than the diameter of the fastener. And the terminal guide plate and the terminal through which the bolt is inserted into the small-diameter hole are electrically connected to each other, and the bolt is connected to the terminal guide plate and the large-diameter hole. Is electrically insulated from the terminal through which the Those were Unishi.
[0017]
  Claims11The external connection terminal of the capacitor according to claim10In FIG. 2, one of the terminal conductor plates has a small diameter and the other has a large diameter.
[0018]
  Claims12The external connection terminal of the capacitor according to claim10 or 11In this embodiment, a plurality of terminal conducting plates are electrically connected to the one terminal.
[0019]
  Claims13The external connection terminal of the capacitor according to claim10 to 12The number of terminals is 2, and the ends of the first and second lead conductors from the capacitor element according to claim 10 are used as terminal conductors as they are as terminal conductors to alternately laminate positive and negative electrodes. 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 terminal.
[0020]
  Claims14The external connection terminal of the capacitor according to claim10 or 11The number of terminals and terminal conductors is both 2,1, 3-9The positive electrode side of the first and second conductor end portions from the capacitor element according to any one of the above is electrically connected to one of the terminal conductive plates, and the negative electrode side is electrically connected to the other of the terminal conductive plates. Is.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
  1A and 1B are diagrams showing a parallel connection structure of capacitors according to Embodiment 1 of the present invention. FIG. 1A is a perspective view thereof, and FIG. 1B is a side view thereof. In the figure, reference numerals 11 and 12a, 12b denote capacitor elements and electrodes formed at both axial ends thereof, which are equivalent to the conventional ones and two, respectively. Reference numeral 13 denotes a copper foil that electrically connects the electrodes 12a of one of the six capacitor elements 11 arranged in the vertical direction of each column (the left end side in FIG. 1 (2)), and 14 denotes the other (FIG. 1). The electrodes 12b on the right end side of (2) are electrically connected to each other, and further from the electrode 12b portion of the capacitor element 11 at the lower end to one electrode 12a side of the capacitor element 11 and along the copper foil 13 It is a copper foil drawn to the upper end part of the lever. In addition, although illustration is abbreviate | omitted in FIG. 1, the insulation process is performed to the extended part of the copper foil 14, as mentioned later.
[0022]
  15 is a conducting wire drawn from the upper end of the copper foil 13, and the conducting wires 15 from each group of a plurality of groups (four groups in the column of FIG. 1) are arranged in parallel with each other and connected to one terminal not shown. Reference numeral 16 denotes a conducting wire drawn from the upper end of the extended portion of the copper foil 14. Like the conducting wire 15, the conducting wires 16 from each group are arranged in parallel with each other and connected to the other terminal (not shown). The copper foil 13 and the conductive wire 15 constitute a first lead wire 17 as a first conductor, and the copper foil 14 and the conductive wire 16 constitute a second lead wire 18 as a second conductor. .
[0023]
  As described above, in the parallel connection structure according to the present invention, the copper foil 13 and the extended portion of the copper foil 14 in which the directions of the flowing currents are opposite to each other are arranged in parallel and close to each other. Since the conducting wires 15 and 16 connecting the lead wires are drawn close to the base portion, most of the magnetic field generated by the current flowing in the first lead wire 17 and the second lead wire 18 in the capacitor is canceled out. As a result, the magnetic energy is reduced, and the internal inductance is greatly reduced.
  Incidentally, when measured with a filter capacitor having a rated voltage of 3 KV, the internal inductance of the conventional parallel connection structure shown in FIG. 14 is 350 nH, whereas the internal inductance of the parallel connection structure of the present invention shown in FIG. 1 is 150 nH. It was proved that the value was greatly reduced to 50% or less.
[0024]
  Next, more specific details of the structure relating to the parallel connection of the capacitor elements 11 and the point of connection work will be described with reference to FIGS.
  First, as shown in FIG. 2, a plurality (6) of capacitor elements 11 having electrodes 12a, 12b formed at both ends in the axial direction are arranged in one row in the vertical direction. Then, a copper foil (metal tape) 13 is soldered to one electrode 12a. 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 twice or more that of the copper foil 13 is soldered to the other electrode 12b, and the remaining portion of the copper foil 14 is bent and pulled out to the copper foil 13 side.
[0025]
  Next, as shown in FIG. 3 (1), the copper foil 13 is insulated from the copper foil 13 through the insulating pipe 19 at the folded portion of the copper foil 14. Further, lead wires 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. 3 (2), six capacitor elements 11 connected in parallel in the vertical direction are grouped together, an insulating sheet 20 is wound around the outer periphery, and an insulating pipe 19 is disposed outside the insulating sheet 20. Then, both of them are fixed together with the insulating tape 21.
[0026]
  FIG. 4 shows the capacitor group completed as described above, in which a plurality of necessary groups (five groups in the example shown in the figure) are arranged in an overlapping manner, and are bound by an insulating tape 22 to finish an integrated capacitor element assembly.
  FIG. 2B shows an arrangement in which the lead portions of the conducting wires 15 and 16 are alternately positioned on the opposite side in adjacent groups. That is, when the conductors 15 of each group drawn out in this structure and the conductors 16 are connected in parallel to the terminals, the axial direction of the current flowing in the capacitor element 11 of each group is changed between adjacent groups. Vice versa. As a result, since a part of the magnetic field formed by these currents is canceled between the groups, it was confirmed that the internal inductance is further reduced by about 20 to 30 nH as compared with the case where they are arranged in the same direction.
  However, even in the structure of FIG. 4A, the same effect can be obtained even if the conductors 15 and 16 are read in reverse every other group, and the conductors 15 after the replacement and the conductors 16 are connected in parallel. .
[0027]
  FIG. 5 is a perspective view showing the capacitor element assembly finished in a form that is accommodated in a case (not shown). Both sides of the assembly shown in FIG. It is tightly bound and formed integrally.
[0028]
  Next, a connection structure between the lead wires 15 and 16 from the capacitor element 11 and the terminals will be described with reference to FIGS. In the figure, 25 is a top plate of a case for accommodating the capacitor element 11 together with insulating oil, 26a and 26b are terminals for external connection attached through the top plate 25, and 27a and 27b are lower ends of the terminals 26a and 26b. Are bolts and nuts formed integrally with each other, 28a and 28b are crimp terminals connected by crimping the tips of the conductors 15 and 16, respectively, and 29 is a binding band that bundles the conductors 15 and 16 in the middle thereof. It is.
[0029]
  Reference numeral 30 denotes an insulating plate (press board) which is fastened and fixed to the terminals 26a and 26b by the fastening tools 27a and 27b together with the crimp terminals 28a and 28b. Here, as shown in FIG. 7, the original shape of the insulating plate 30 is a single flat plate, and holes 31 through which the bolts of the fasteners 27a and 27b are inserted are formed in the vicinity of both left and right ends thereof. Further, a crease 32 is formed at the center and both ends thereof. The insulating plate 30 is fastened and fixed to the terminals 26a and 26b by the fastening tools 27a and 27b in a state where the fold 32 is bent as shown in the cross section of FIG.
[0030]
  As a result, the central crease 32 portion protrudes in a V shape, and this protruding portion of the insulating plate 30 reinforces the electrical insulation between the crimp terminals 28a and 28b. For this reason, the dimension between the crimp terminals 28a and 28b, and hence the dimension between the terminals 26a and 26b, can be reduced accordingly, which is more advantageous for reducing the inductance of the capacitor.
  In addition, since one insulating plate 30 is used, when the nuts of the fasteners 27a and 27b are tightened, the insulating plate 30 does not rotate, so that there is an advantage that the tightening workability is improved. .
[0031]
Embodiment 2. FIG.
  FIG. 8 is a diagram showing a parallel connection structure of capacitors according to Embodiment 2 of the present invention. FIG. 8 (1) is a perspective view showing a state during the assembly, and FIG. 8 (2) is a top view of the state (1). FIG. 3 is a perspective view showing a state after assembly. In the figure, 11 is a capacitor element, and in the example shown in the figure, six are arranged in the vertical direction, and electrodes 12a and 12b are formed at both axial ends as in the previous embodiment.
[0032]
  33 is a first electrode plate in which, for example, a 0.3 mm thick copper plate is bent into an L shape, and the short side portion is connected to the electrode 12a of each capacitor element 11 by soldering or the like, and 34 is a first electrode plate 33 is a first lead conductor extending to the terminal (not shown) by extending the long side portion at the upper end. Reference numeral 35 denotes a second electrode plate processed into a symmetrical L shape with the first lead conductor 34, and electrically connects the electrodes 12b of the 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 at the lower end of the second electrode plate 35, and this is a terminal (not shown) which becomes the second lead conductor 37 from the upper end position of the second electrode plate 35. Connected to the other of the two.
  A first conductor 38 is formed by the first electrode plate 33 and the first lead conductor 34, and a second conductor 39 is formed by the second electrode plate 35, the folded conductive plate 36 and the second lead conductor 37. Constitute.
[0033]
  8 (1) and 8 (2) show the assembly process in the stage where the folded conductive plate 36 is bent by 90 ° from the second electrode plate 35. FIG. 8 (3) shows a completely folded and further extended second lead conductor. A state in which processing is finished so that 37 faces the first lead conductor 34 in parallel is shown.
  Although not shown in FIG. 8, between each capacitor element 11 and the first electrode plate 33, between the first electrode plate 33 and the second electrode plate 35, and the second electrode For example, a 0.8 mm thick press board is inserted between the plate 35 and the folded conductive plate 36 to ensure electrical insulation.
[0034]
  As described above, in the parallel connection structure shown in the second embodiment of the present invention, the two electrode plates 33 and 35 that connect the electrodes 12a and 12b in parallel face each other at a narrow interval, and are connected to the terminals. Drawing is performed from both ends (upper and lower ends) of the capacitor element in the arrangement direction, and the folded conductive plate 36 drawn from the lower end of the second electrode plate 35 also faces the electrodes 33 and 35 in parallel at a narrow interval. Therefore, the magnetic field generated by the current flowing through these conductive plates is more reliably offset than in the structure shown in the first embodiment, 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.
  Since the lead conductors 34 and 37 extending 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.
  As a result of actual measurement using a model capacitor prototyped with the same rating as described above, an extremely low inductance capacitor having internal inductances of about 60 nH and 100 nH or less could be obtained.
[0035]
  FIG. 9 shows an assembly structure in which a plurality of groups shown in FIG. 8 are connected in parallel (three groups in the example shown in the figure). For example, as shown in FIG. The parts of the conductive plates 33, 35, and 36 are covered with the processed inter-group insulating plate 40 (FIG. (2)), and a plurality of groups are arranged in parallel (FIG. (3)).
  Note that a terminal structure for leading out the multiple lead conductors 34 and 37 drawn from the plurality of groups of capacitor elements 11 to the outside of the capacitor case in a low inductance state will be described later.
[0036]
Embodiment 3 FIG.
  FIG. 10 shows a parallel connection structure according to Embodiment 3 of the present invention. Portions that are the same as or correspond to those in FIG. 8 are given the same reference numerals. A difference 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 conversely, 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, and therefore, a necessary insulation distance is ensured between the two in the same plane. Yes.
[0037]
  Also in the third embodiment, since the folded conductive plate 36 and the first electrode plate 33A and the second electrode plate 35A face each other in parallel at a narrow interval, a magnetic field generated by the current flowing through these conductors is generated. There is an advantage that it is effectively offset and low inductance characteristics are realized, the copper material is reduced, and further, the stacking dimensions of each conductor is reduced and the parallel connection capacitor can be miniaturized.
[0038]
Embodiment 4 FIG.
  FIG. 11 shows a parallel connection structure according to Embodiment 4 of the present invention. Here, a structure in which capacitor element groups connected in parallel are connected in series is handled. Fig. 1 (1) is a perspective view showing a state during the assembly, Fig. 2 (2) is a view of the state of (1) seen from above, and Fig. 3 (3) is a state where the assembly is finished, on the side of the serial connection part. (4) is a perspective view seen from the direction opposite to (3).
[0039]
  In the figure, 41 is a capacitor element in one column arranged in the vertical direction, 42 is a capacitor element in the other column arranged in the same vertical direction, and 43 is one electrode 41a, 42a of both capacitor elements 41, 42. Are connected to the electrodes 41a and 42a by soldering or the like using a copper plate having a thickness of 0.3 mm, for example. 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. 35B has the same structure as 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 figure, illustration of the insulating plate inserted between the conductive plates is omitted.
[0040]
  In the case of the fourth embodiment, particularly as shown in FIGS. 11 (3) and 11 (4), the capacitor element groups 41 and 42 arranged in two rows are connected in series and explained in the second embodiment (FIG. 8). Since the parallel connection structure using exactly the same first conductor 38 and second conductor 39 is adopted, the internal inductance can be greatly reduced, and one series type capacitor and its parallel connection parts Can be obtained, and a compact and inexpensive 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 parallel and connected in parallel.
  In FIG. 11, the capacitor elements 41, 42 arranged in the vertical direction are collectively connected in series by the single serial connection conductor 43, but the capacitor elements 41, 42 in the same vertical direction in both rows are arranged. If each is connected individually in series, the current balance of each capacitor element becomes better.
[0041]
Embodiment 5. FIG.
  In the above description, the structure in which a plurality of arranged capacitor elements are connected in parallel under a low inductance has been mainly described. However, how the conductors from these capacitor elements are pulled out of the case with a low inductance may be This is an extremely important issue when pursuing low inductance. In the fifth embodiment, a novel external connection terminal that solves this problem will be described.
[0042]
  FIG. 12 shows an external connection terminal applied to a usual single-phase capacitor. The positive electrode side conductor and the negative electrode side conductor from the capacitor element housed in the case using two terminals are connected to the outside of the case. It is something to pull out. FIG. 1A is a side view thereof, FIG. 2B is an exploded perspective view for explaining the assembled state of each component, and FIG. 3C is a cross-sectional view showing one terminal cut in the vertical direction. It is.
[0043]
  In the figure, 44a and 44b are terminals comprising a center conductor 46 formed on bolts 45a and 45b with male threads at the lower part and an insulator 47 which is inserted into the center conductor 46 and is integrally formed with a metallicon or the like. It is attached through the top plate 25 of the case. Reference numerals 48 and 49 denote terminal conductors on the positive electrode side and the negative electrode side, respectively, which are formed, for example, using the end portions 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 both terminal conducting plates 48 and 49, and is fastened and fixed together with the terminal conducting plates 48 and 49 by a fastening tool described later. An insulating plate 51 covers the upper and lower surfaces of the terminal conducting plates 48 and 49, and is fixedly attached to the terminal conducting plates 48 and 49 by fixing means (not shown). The terminal conducting plates 48 and 49 and the insulating plates 50 and 51 constitute a laminated conducting plate 52.
  53 is a tightening nut that is screwed into the bolts 45a and 45b, 54 is a spring washer, and 55 is an electrode spacer for adjusting dimensions in the axial direction during tightening.
[0044]
  Furthermore, as shown in FIG. 12 (2), the terminal conductor plates 48 and 49 and the insulating plates 50 and 51 are all formed with holes through which the bolts 45a and 45b are inserted, but the holes have different diameters. ing. That is, first, the terminal guide plate 48 will be described. A small diameter hole H1 slightly larger than the diameter of the bolt 56 is smaller at the insertion position of the bolt 45b and smaller than the diameter of the fastening tool 56, and tightened at the insertion position of the bolt 45a. Large diameter holes H <b> 2 that are larger than the diameters of the tools 56 and that can ensure insulation from the fastening tools 56 are formed. On the contrary, the terminal guide plate 49 is formed with a small diameter hole H1 at the position of the bolt 45a and a large diameter hole H2 at the position of the bolt 45b.
  Each insulating plate 50, 51 is formed with a hole H3 having a diameter that allows the fastener 56 to be inserted therethrough.
[0045]
  The terminal conductive plates 48 and 49 and the insulating plates 50 and 51 having the holes H1, H2 and H3 having different diameters described above are laminated in the order shown in the drawing, and the fasteners 56 (53, 54 and 55) are attached. Used to tighten to the terminals 44a and 44b integrally. In the state where the assembly is completed, as can be seen from FIG. 12 (2) in particular, in the terminal conductor plate 48, the terminal conductor plate 48 is directly connected to the terminal by tightening with the tightening nut 53 and the spring washer 54 around the small diameter hole H1. As a result, the terminal conductor plate 48 and the terminal 44b are electrically connected. On the other hand, since the large-diameter hole H2 is formed in the insertion portion of the bolt 45a, the terminal conducting plate 48 and the terminal 44a are electrically insulated.
  By the completely same mechanism, in the terminal conductor plate 49, the terminal conductor plate 49 is pressed and brought into contact with the central conductor 46 of the terminal 44a at the portion where the small diameter hole H1 is formed, and the terminal conductor plate 49 and the terminal 44a are brought into contact with each other. Electrically connected, a large-diameter hole H2 is formed in the insertion portion of the bolt 45b, and the terminal conducting plate 49 and the terminal 44b are electrically insulated.
[0046]
  Here, when the small-diameter hole H1 portion of the terminal conducting plate 49 is tightened, a gap is generated between the terminal conducting plate 49 and the stepped portion of the central conductor 46, and therefore the electrode spacer 55 is inserted to fill the gap. Thus, a certain pressure contact state is obtained without deforming the terminal conducting plate 49.
  In FIG. 12, an electrode spacer is not used on the bolt 45b side, but an electrode spacer having a required height is inserted depending on the relational dimensions including the central conductor 46 and the like.
[0047]
  As described above, the external connection terminals according to the fifth embodiment have the strip-shaped lead conductors 34 and 37 led out from the capacitor element in a state of facing each other in parallel with each other while maintaining the shape and the facing state as they are. Since it can lead directly to the terminals 44a and 44b, the reduction of inductance as a capacitor device can be realized at a more thorough level.
  The lead conductors derived from the plurality of groups of capacitor elements described in FIG. 9, and in FIG. 9, six lead conductors are derived from the three groups of capacitor elements, positive and negative. By constructing the laminated conductive plate 52 in such a manner that six lead conductors are alternately laminated on the positive side, negative side, positive side, negative side,..., The same procedure as described in FIG. Thus, a low inductance external connection terminal can be realized.
[0048]
  Furthermore, the external connection terminal of the capacitor described in FIG. 12 is a three-phase capacitor, or even if a single-phase capacitor uses a plurality of terminals for each pole due to current capacity, etc. Even when a terminal is required, a method similar to that described above, in which the small-diameter hole H1 and the large-diameter hole H2 are combined, can be applied.
[0049]
Embodiment 6 FIG.
  FIG. 13 shows a modification of the external connection terminal of the capacitor. Here, for the two terminal bolts 45a and 45b, independent rectangular terminal conducting plates 57 and 58 and an insulating plate 59 inserted between them are used, and the terminal conducting plate 57, the bolt 45a, and The terminal conducting plate 58 and the bolt 45b are electrically connected to each other. Then, the plurality of positive electrode side conductors 15 from each capacitor element 11 group are electrically connected to the terminal conductor plate 57 and the negative electrode side conductor wire 16 is electrically connected to the terminal conductor plate 58 by soldering or the like.
  By adopting the above structure, a low inductance external connection terminal can be realized regardless of the shape of the lead conductor from the capacitor element.
[0050]
  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, and the present invention is applied to both ends in one axial direction set on the outer shape. The present invention can be widely applied to capacitor elements in which electrodes are formed, and has the same effect.
  Further, in each of the embodiments other than the fourth embodiment, the capacitor having only the parallel connection structure has been described. However, a capacitor in which the capacitor elements in these embodiments are connected in parallel is further connected in series. Even so, the present invention can be applied to the parallel connection portion as it is, and the same effect can be obtained.
[0051]
【The invention's effect】
  As described above, in the capacitor according to the first aspect, the capacitor elements are arranged in parallel, and one of the electrodes of the capacitor elements is electrically connected to each other and is led out from one end in the arrangement direction and is connected to the terminal. A first conductor extending to one side and the other of the electrodes of each capacitor element are electrically connected to each other, and a second conductor led out from the other end in the arrangement direction to the other terminal is provided.,
  The first conductor is formed of a strip-shaped first lead wire that is electrically connected to one of the electrodes of each capacitor element and is led out from one end in the arrangement direction of the capacitor elements and reaches one of the terminals, The second conductor is electrically connected to the other of the electrodes of the capacitor elements and led out from the other end in the arrangement direction, and then crossed to one side of the electrode from the other end in the arrangement direction. It consists of a strip-shaped second lead wire that extends along the first lead wire to the other of the terminals,
In addition, in the portion along the first lead wire and the second lead wire, the both lead wires are arranged so as to face each other in a direction perpendicular to the surface of the rectangular parallelepiped enclosing the plurality of capacitor elements.Therefore, the current balance of each capacitor element connected in parallel is improved, and there is an effect of heat generation equalization between the capacitor elements,The inductance of the lead wire part decreases,The internal inductance as a capacitor is reduced.Furthermore, the external dimensions including a plurality of capacitor elements and both lead wires can be reduced.
[0052]
    Claims2In the capacitor according to the present invention, a pair of bipolar electrodes attached through the case housing the capacitor element, a crimp terminal attached to an end of a lead wire connected to each of the terminals, and the crimp terminal as the terminals. And a clamp that is fastened to and fixed to the both terminals by the clamp together with the crimp terminal, and a projecting portion that is formed by bending the center between the two terminals. Since the insulation plate for reinforcing the electrical insulation between the crimp terminals is provided, the dimensions between the terminals can be reduced and the tightening workability can be improved with a simple structure.
[0053]
  Claims3In capacitors related toThe capacitor elements are arranged in parallel, one of the electrodes of the capacitor elements is electrically connected to each other, the first conductor leading from one end in the arrangement direction to one of the terminals, and the electrodes of the capacitor elements A second conductor that is electrically connected to each other and led out from the other end in the arrangement direction to the other of the terminals,The first conductor extends in the arrangement direction of the capacitor elements, and includes a first electrode plate that electrically connects one of the electrodes of the capacitor elements to each other and one end of the first electrode plate in the arrangement direction. Consisting of a first lead conductor leading to one of the terminals,the aboveA second conductor extends in the arrangement direction and extends from the other end in the arrangement direction of the second electrode plate to electrically connect the other of the electrodes of the capacitor elements to each other. A folded conductive plate extending to one end in the arrangement direction and a second lead conductor extending from one end of the folded conductive plate to the other of the terminals,The first and second electrode plates face each other in parallel with the folded conductive plate.Therefore, the current balance of the capacitor elements connected in parallel is improved, the inductance of the conductor portion is reduced, and the internal inductance as a capacitor is reduced.
[0054]
  Claims4In the capacitor according to the above, 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.
[0055]
  Claims5In the capacitor according to the first aspect, the width of the first electrode plate is gradually decreased from one end to the other end in the arrangement direction of the capacitor elements, and the width of the second electrode plate is directed from one end to the other end in the arrangement direction. Since the electrode plates are gradually increased and disposed on the same surface with a predetermined gap, the conductive plate material can be saved and the size thereof can be reduced.
[0056]
  Claim6In the capacitor according to the above, the capacitor elements are arranged in two rows in parallel, and a series connection conductor that electrically connects one of the electrodes of the capacitor elements in the two rows is connected between the capacitor elements in the two rows. A first electrode plate extending in the arrangement direction and electrically connecting the other electrode of each of the capacitor elements in one of the two rows to one of the terminals from one end of the first electrode plate in the arrangement direction. A first conductor composed of a first lead conductor and the other row of the capacitor elements extending in the arrangement direction between the two rows of capacitor elements are electrically connected to each other. A second electrode plate that extends from the other end in the arrangement direction of the second electrode plate and extends to one end in the arrangement direction, and a second electrode plate that extends from one end in the arrangement direction of the return guide plate to the other of the terminals. Consisting of two lead conductors Because with two conductors, parallel connection structure of a capacitor element including a portion connected in series, it is possible to reduce the inductance by a simple structure and what the same parallel connection only.
[0057]
  Claims7In the capacitor according to the above, a plurality of capacitor elements are divided into a plurality of groups, and each capacitor element is connected in parallel using the first and second conductors for each group. This parallel connection structure can be realized easily and simply.
[0058]
  Claims8In the capacitor according to the above, since the groups are arranged in parallel so that the axial directions of the currents flowing through the capacitor elements are opposite to each other in the adjacent groups, the interior of the capacitor configured by connecting a plurality of groups in parallel Inductance can be further reduced.
[0059]
  Claims9In the capacitor according to the present invention, since the first and second lead conductors are band-shaped and both lead conductors are opposed to each other in parallel, the inductance of the lead conductor portion is particularly effectively reduced.
[0060]
  Claim10In the external connection terminal of the capacitor according to the present invention, a plurality of terminals attached to a surface of the case having a bolt as a central conductor and housing the capacitor element so that the bolts are parallel to each other at a predetermined interval, A plurality of holes are formed corresponding to the mounting positions of the terminals, and a laminated conductor plate made up of a plurality of terminal conductor plates laminated with an insulating plate interposed therebetween, and the holes of the laminated conductor plates are inserted through the holes. A fastener that is screwed into each bolt and mechanically couples each of the terminals and the laminated conductive plate, and the plurality of holes of the terminal conductive plate have small diameters that are smaller by a predetermined dimension than the diameter of the fastener; By connecting the terminal conducting plate and the terminal through which the bolt is inserted into the small-diameter hole, the terminal conducting plate and the large-diameter hole are electrically connected. Electrically connected to the terminal through which the bolt is inserted Since such edges, it is possible to reduce the inductance of the connecting portion between the capacitor element and the terminal.
[0061]
  Claims11In the external connection terminal of the capacitor according to the present invention, since one hole of each terminal conductor plate has a small diameter and the other has a large diameter, one terminal is electrically connected to one terminal conductor plate. It is possible to realize an external connection terminal of a capacitor having a simple structure connected to the capacitor.
[0062]
  Claims12In the external connection terminal of the capacitor according to the present invention, since a plurality of terminal conductive plates are electrically connected to one terminal, the terminal conductive plates can be connected in parallel with a simple configuration.
[0063]
  Claims13In the external connection terminal of the capacitor according to claim 2, the number of terminals is 2,9The end portions of the first and second lead conductors from the capacitor element described in the above are used as terminal conductor plates as they are and alternately laminated with positive and negative electrodes to form a laminated conductor plate, and the terminal conductor plate on the positive electrode side is one of the terminals. Since the terminal conductor plate on the negative electrode side is electrically connected to the other of the terminals, a compact and extremely low inductance capacitor integrated with the lead conductor from the capacitor element can be obtained.
[0064]
  Claims14In the external connection terminal of the capacitor according to claim 2, the number of terminals and terminal conductors is both 2,1, 3-9The positive electrode side of the first and second conductor end portions from the capacitor element according to any one of the above is electrically connected to one of the terminal conductive plates, and the negative electrode side is electrically connected to the other of the terminal conductive plates. Therefore, a low-inductance external connection terminal can be realized regardless of the shape of the conductor from the capacitor element.
[Brief description of the drawings]
FIG. 1 is a diagram showing a capacitor parallel connection structure according to Embodiment 1 of the present invention;
FIG. 2 is a diagram for explaining the details of the parallel connection structure of FIG. 1 and the point of connection work.
FIG. 3 is a diagram for explaining the details of the parallel connection structure of FIG. 1 and the point of connection work.
FIG. 4 is a diagram for explaining the details of the parallel connection structure of FIG. 1 and the point of connection work.
FIG. 5 is a diagram for explaining the details of the parallel connection structure of FIG. 1 and the point of connection work.
6 is a view showing a connection structure between a lead wire and a terminal in the capacitor of FIG. 1;
7 is a view showing an original form of the insulating plate of FIG. 6. FIG.
FIG. 8 is a diagram showing a parallel connection structure of capacitors in Embodiment 2 of the present invention.
9 is a diagram for explaining a point when a plurality of groups of capacitors in FIG. 8 are arranged in parallel. FIG.
FIG. 10 is a diagram showing a capacitor parallel connection structure according to Embodiment 3 of the present invention;
FIG. 11 is a diagram showing a capacitor parallel connection structure according to a fourth embodiment of the present invention.
12 is a diagram showing an external connection terminal of a capacitor according to Embodiment 5 of the present invention. FIG.
FIG. 13 is a diagram showing an external connection terminal of a capacitor according to Embodiment 6 of the present invention.
FIG. 14 is a diagram showing a conventional capacitor parallel connection structure;
[Explanation of symbols]
  11, 41, 42 capacitor element,
12a, 12b, 41a, 41b, 42a, 42b electrode, 13, 14 copper foil,
15, 16 lead wire, 17 first lead wire, 18 second lead wire,
25 Top plate, 26a, 26b terminal, 27a, 27b Fastener,
28a, 28b Crimp terminal, 30 Insulating plate, 32 Fold,
33, 33A, 33B first electrode plate, 34 first lead conductor,
35, 35A, 35B second electrode plate, 36 folded conductive plate,
37 second lead conductor, 38 first conductor, 39 second 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 (14)

In a capacitor formed by connecting a plurality of capacitor elements in which electrodes are formed at both ends in the axial direction in parallel to each other,
The capacitor elements are arranged in parallel, and one of the electrodes of the capacitor elements is electrically connected to each other, the first conductor leading from one end in the arrangement direction to one of the terminals, and the capacitor elements A second conductor that is electrically connected to each other and led from the other end in the arrangement direction to the other of the terminals ,
The first conductor is formed of a strip-shaped first lead wire that is electrically connected to one of the electrodes of each capacitor element and is led out from one end in the arrangement direction of the capacitor elements and reaches one of the terminals, The second conductor is electrically connected to the other of the electrodes of the capacitor elements and led out from the other end in the arrangement direction, and then crossed to one side of the electrode from the other end in the arrangement direction. It consists of a strip-shaped second lead wire that extends along the first lead wire to the other of the terminals,
In addition, both lead wires are disposed so as to face each other in a direction perpendicular to the surface of the rectangular parallelepiped enclosing the plurality of capacitor elements in a portion where the first lead wire and the second lead wire are aligned. Capacitor characterized by . A pair of bipolar terminals attached through the case containing the capacitor element, a crimp terminal attached to the end of the lead wire connected to each terminal, and a clamp that fastens and fixes the crimp terminal to each terminal And both ends thereof are fixed together with the crimping terminals together with the crimping terminals by the clamping tool, bridging between the two terminals, and an electric part between the crimping terminals is formed by bending the substantially center thereof. The capacitor according to claim 1, further comprising an insulating plate that performs mechanical insulation reinforcement . In a capacitor formed by connecting a plurality of capacitor elements in which electrodes are formed at both ends in the axial direction in parallel to each other,
The capacitor elements are arranged in parallel, one of the electrodes of the capacitor elements is electrically connected to each other, the first conductor leading from one end in the arrangement direction to one of the terminals, and the capacitor elements A second conductor that is electrically connected to each other and led from the other end in the arrangement direction to the other of the terminals,
The first conductor extends in the arrangement direction of the capacitor elements, and a first electrode plate that electrically connects one of the electrodes of the capacitor elements to each other and the arrangement direction of the first electrode plates A first lead conductor extending from one end to one of the terminals, the second conductor extending in the arrangement direction and electrically connecting the other of the electrodes of the capacitor elements to each other; A second 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 second lead conductor extending from one end in the arrangement direction to the other of the terminals. The capacitor is characterized in that the first and second electrode plates oppose each other in parallel with the folded conductive plate . 4. The capacitor according to claim 3, wherein the first electrode plate and the second electrode plate face each other in parallel . The width of the first electrode plate is gradually decreased from one end to the other end in the arrangement direction of the capacitor elements, and the width of the second electrode plate is gradually increased from one end to the other end in the arrangement direction. 4. The capacitor according to claim 3, wherein the electrode plates are disposed on the same surface with a predetermined gap . In a capacitor formed by connecting a plurality of capacitor elements in which electrodes are formed at both ends in the axial direction in parallel to each other,
The capacitor elements are arranged in two rows in parallel, a serial connection conductor that electrically connects one of the electrodes of the capacitor elements in the two rows, and extends in the arrangement direction between the capacitor elements in the two rows A first electrode plate that electrically connects the other electrode of each of the capacitor elements in the two rows to the other, and a first lead extending from one end in the arrangement direction of the first electrode plate to one of the terminals. A second conductor that extends in the arrangement direction between the first row of capacitor elements and the two rows of capacitor elements and electrically connects the other of the electrodes of the other capacitor elements of the two rows to each other; A folded conducting plate extending from the other end in the arrangement direction of the electrode plate and the second electrode plate and reaching one end in the arranging direction, and a second lead conductor extending from the one end in the arrangement direction of the folded conducting plate to the other of the terminals A second conductor consisting of Capacitor and said. 7. A plurality of capacitor elements are divided into a plurality of groups, and the capacitor elements are connected in parallel using the first and second conductors for each group. Capacitor described in . 8. The capacitor according to claim 7, wherein the groups are arranged in parallel so that the axial directions of the currents flowing through the capacitor elements are opposite to each other in adjacent groups . 9. The capacitor according to claim 3, wherein the first and second lead conductors are band-shaped, and both lead conductors face each other in parallel . A plurality of terminals attached to one surface of the case having a bolt as a central conductor and accommodating the capacitor element so that the bolts are parallel to each other, and a plurality of holes corresponding to the attachment positions of the plurality of terminals And a plurality of terminal conductive plates stacked with an insulating plate interposed therebetween, and the bolts inserted through the holes of the stacked conductive plates and screwed into the terminals. A fastener that mechanically couples the laminated conductor plate; and a plurality of holes in the terminal conductor plate, each having a small diameter smaller than the diameter of the fastener and a larger diameter larger than the predetermined dimension. By configuring, the terminal conducting plate and the terminal through which the bolt is inserted into the small diameter hole are electrically connected, and the terminal conducting plate and the terminal through which the bolt is inserted into the large diameter hole are electrically insulated. Capacitor external connection terminal 11. The terminal for external connection of a capacitor according to claim 10, wherein one hole of each terminal conducting plate has a small diameter and the other has a large diameter . The terminal for external connection of a capacitor according to claim 10 or 11, wherein a plurality of terminal conducting plates are electrically connected to one terminal. The number of terminals is 2, and the ends of the first and second lead conductors from the capacitor element according to claim 9 are used as terminal conductive plates as they are to alternately stack positive and negative electrodes to form a stacked conductive plate, 13. The capacitor according to claim 10, wherein the terminal conducting plate is electrically connected to one of the terminals, and the negative terminal conducting plate is electrically connected to the other of the terminals . Terminal for external connection. The number of terminals and terminal conductor plates is both 2, and the positive electrode side of the first and second conductor ends from the capacitor element according to any one of claims 1 and 3 to 9 is one of the terminal conductor plates, The terminal for external connection of a capacitor according to claim 10 or 11, wherein the negative electrode side is electrically connected to the other of the terminal conducting plates .

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