JP2015130441A - Capacitor block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a capacitor block which enables miniaturization while enhancing insulation properties.SOLUTION: A capacitor block 1 includes a plurality of capacitors 10, a first conductive plate 11, a second conductive plate 12, and a resin molded portion 13. Each of first terminals 10a of the plurality of capacitors 10 is electrically connected to the first conductive plate 11. Each of second terminals 10b of the plurality of capacitors 10 is electrically connected to the second conductive plate 12. In the resin molded portion 13, the first conductive plate 11 and the second conductive plate 12 are insert-molded such that a portion to which the first terminals 10a are connected on the surface of the first conductive plate 11 and a portion to which the second terminals 10b are connected on the surface of the second conductive plate 12 are exposed from one surface. An insulation wall 15 projecting from a portion between an exposed portion of the first conductive plate 11 and an exposed portion of the second conductive plate 12 is provided on the surface of the resin molding portion 13.

Description

  The present invention relates to a capacitor block in which a plurality of capacitors are electrically connected.

  Conventionally, inverters that control motor generators such as electric vehicles and hybrid vehicles require smoothing capacitors with large capacity, high rated voltage, and high withstand current, and vehicle capacitors with multiple capacitors connected in parallel have been proposed. (For example, refer to Patent Document 1).

JP 2012-9499 A

  In the vehicle capacitor described in Patent Document 1, a plurality of small capacitors each having a small capacity are connected in parallel between two bus bars. The capacitor described in Patent Document 1 has terminals protruding from both ends. However, when two terminals protrude from one surface of the capacitor, the distance between the two bus bars is reduced, and the bus bars are electrically insulated. In addition, there is a problem that an insulating member is required, which leads to an increase in size.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a capacitor block that is miniaturized while improving insulation.

  The capacitor block of the present invention includes a plurality of capacitors, a first conductive plate, a second conductive plate, and a resin molded portion, and an insulating wall is provided on a surface of the resin molded portion. . A first terminal included in each of the plurality of capacitors is electrically connected to the first conductive plate. A second terminal included in each of the plurality of capacitors is electrically connected to the second conductive plate. In the resin molded portion, a portion where the first terminal is connected to the surface of the first conductive plate and a portion where the second terminal is connected to the surface of the second conductive plate are exposed from one surface. Thus, the first conductive plate and the second conductive plate are insert-molded. An insulating wall protruding from a portion between the exposed portion of the first conductive plate and the exposed portion of the second conductive plate is provided on the surface of the resin molded portion.

  The capacitor block preferably includes the following configuration. Each of the first conductive plate and the second conductive plate is formed in a comb shape in plan view. The first conductive plate and the first conductive plate and the second conductive plate so that the convex portion provided in the other of the first conductive plate and the second conductive plate enters the concave portion provided in one of the first conductive plate and the second conductive plate. The second conductive plate is disposed.

  In this capacitor block, it is also preferable that each of the first conductive plate and the second conductive plate is provided with a connection portion for detachably connecting to an external electric circuit.

  In this capacitor block, it is preferable that the connection portion is a terminal formed by cutting and raising a part of a metal plate constituting each of the first conductive plate and the second conductive plate.

  According to the present invention, on the surface of the resin molded portion, the exposed portion of the first conductive plate (the portion to which the first terminal is connected) and the exposed portion of the second conductive plate (the portion to which the second terminal is connected) An insulating wall projecting from a portion between is provided. This insulating wall increases the insulation distance between the first conductive plate and the first terminal, and the second conductive plate and the second terminal, thereby improving the insulation. Moreover, since the insulating wall is provided integrally with the resin molding portion, a member for improving the insulation between the first conductive plate and the first terminal and the second conductive plate and the second terminal is provided as a separate part. Compared to the above, it is possible to reduce the size of the capacitor block. In addition, since the insulating property is improved by the insulating wall, a plurality of capacitors can be arranged closer to each other, and the capacitor block can be reduced in size.

(A) is a bottom view of the capacitor block of this embodiment, (b) is a BB sectional view. The capacitor | condenser block of this embodiment is shown, (a) is a top view, (b) (c) is a side view. The capacitor | condenser block of this embodiment is shown, (a) is the external appearance perspective view seen from the upper side, (b) is the external appearance perspective view seen from the lower side. It is a top view of the capacitor block of this embodiment. It is a top view of the 1st terminal board and 2nd terminal board which are used for the capacitor block of this embodiment. It is a block diagram of the whole system using the capacitor block of this embodiment.

  An embodiment of a capacitor block according to the present invention will be described with reference to FIGS.

  The capacitor block of this embodiment is used in a circuit that allows a large current to flow at a high voltage, and is used, for example, in a power conditioner of a photovoltaic power generation system installed in a general household.

  FIG. 6 is a block diagram of an entire circuit using the capacitor block 1, and includes a solar cell module 2, a DC / DC converter 3, and an inverter module 4.

  The DC / DC converter 3 performs control (for example, maximum power point tracking control (MPPT)) that converts the output of the solar cell module 2 into direct current power suitable for the inverter module 4.

  The inverter module 4 includes a capacitor block 1 and an inverter circuit 5. The capacitor block 1 is provided at the input stage of the inverter module 4 and smoothes the output of the DC / DC converter 3. The inverter circuit 5 converts the DC voltage output from the DC / DC converter 3 and smoothed by the capacitor block 1 into an AC voltage having the same frequency as the commercial power frequency, and is connected to the commercial power system. Or it outputs to the self-supporting output which makes the load self-supporting.

  Next, the configuration of the capacitor block 1 of the present embodiment will be described. The capacitor block 1 includes a plurality of capacitors 10, a first conductive plate 11, a second conductive plate 12, and a resin molded portion 13.

  The plurality of capacitors 10 are electrolytic capacitors having the same capacitance value and rated voltage, and the plurality of capacitors 10 are connected in parallel between the first conductive plate 11 and the second conductive plate 12 as shown in FIG. ing. In the present embodiment, the first terminal 10a on the positive electrode side included in each of the plurality of capacitors 10 is electrically connected to the first conductive plate 11, and the second terminal 10b on the negative electrode side included in each of the plurality of capacitors 10 is the first one. The two conductive plates 12 are electrically connected.

  As shown in FIG. 5, the first conductive plate 11 is formed in a comb-like shape in plan view by punching and bending a metal plate. The first conductive plate 11 is a strip-shaped connecting piece 11a and a rectangular plate-like protrusion that protrudes laterally from both ends and the center of one side (left side in FIG. 5) along the longitudinal direction of the connecting piece 11a. The piece 11b is formed in a substantially E shape.

  Similarly to the first conductive plate 11, the second conductive plate 12 is formed in a comb-teeth shape in plan view by subjecting a metal plate to punching and bending (see FIG. 5). The second conductive plate 12 is a strip-shaped connecting piece 12a and a rectangular plate-like protrusion that protrudes laterally from both ends and the center of one side (the right side in FIG. 5) along the longitudinal direction of the connecting piece 12a. It is formed in a substantially E shape with the piece 12b. In the present embodiment, the second conductive plate 12 is formed in the same shape and size as the first conductive plate 11.

  The first conductive plate 11 and the second conductive plate 12 are provided in the recess provided in one of the first conductive plate 11 and the second conductive plate 12, and the other of the first conductive plate 11 and the second conductive plate 12 is provided. It arrange | positions so that a convex part may enter. That is, the protruding piece 12b (convex part) of the second conductive plate 12 enters the concave portion between the adjacent protruding pieces 11b of the first conductive plate 11, and between the adjacent protruding pieces 12b of the second conductive plate 12. It arrange | positions so that the protrusion piece 11b (convex part) of the 1st electroconductive board 11 may enter in the recessed part. Here, the first conductive plate 11 and the second conductive plate 12 are arranged with a predetermined gap therebetween.

  A plurality of through holes 11c into which the first terminals 10a (positive-side terminals) of the capacitors 10 are respectively inserted in the protruding pieces 11b of the first conductive plate 11 are spaced apart in the longitudinal direction of the protruding pieces 11b. Is provided. A plurality of through-holes 12c into which the second terminals 10b (terminals on the negative electrode side) of the capacitor 10 are respectively inserted in the protruding pieces 12b of the second conductive plate 12 are spaced apart in the longitudinal direction of the protruding pieces 12b. Is provided. Each of the plurality of capacitors 10 includes a first conductive plate 11 and a first terminal 10a inserted in the through hole 11c of the protruding piece 11b and the second terminal 10b inserted in the through hole 12c of the protruding piece 12b. It is soldered to the second conductive plate 12 and mounted so as to straddle the first conductive plate 11 and the second conductive plate 12.

  Of the three projecting pieces 11b included in the first conductive plate 11, two projecting pieces 11b arranged between adjacent projecting pieces 12b are longer than the other projecting piece 11b. The width dimension in the direction (vertical direction in FIG. 5) is formed large. Band-shaped terminals 11d are respectively formed on the two wide protruding pieces 11b by cutting and raising a part thereof. That is, two strip-shaped terminals 11d are provided on the first conductive plate 11 on the positive electrode side.

  Similarly, of the three protruding pieces 12b included in the second conductive plate 12, two protruding pieces 12b disposed between adjacent protruding pieces 11b are connected to the connecting piece 12a more than the other protruding piece 12b. The width dimension in the longitudinal direction (vertical direction in FIG. 5) is formed large. Band-shaped terminals 12d are respectively formed on the two wide projecting pieces 12b by cutting and raising a part thereof. That is, two strip-shaped terminals 12d are also provided on the second conductive plate 12 on the negative electrode side.

  The first conductive plate 11 and the second conductive plate 12 are integrated with the resin molding portion 13 by insert molding. The resin molding part 13 is formed in the shape of a rectangular plate from an insulating synthetic resin, and the first conductive plate 11 and the second conductive plate 12 are held by the resin molding part 13.

  As shown in FIG. 1 (a), on the surface of the first conductive plate 11, a portion to which the first terminal 10 a is connected, that is, a portion where the through hole 11 c is provided is provided on the lower surface of the resin molding portion 13. It is exposed from the rectangular opening 14a. A through hole 13a is formed in the resin molded portion 13 so as to be continuous with each of the plurality of through holes 11c provided in the first conductive plate 11 (see FIG. 1B). Similarly, on the surface of the second conductive plate 12, a portion to which the second terminal 10 b is connected, that is, a portion where the through hole 12 c is provided is exposed from a rectangular opening 14 b provided on the lower surface of the resin molding portion 13. To do. A through hole 13b is formed in the resin molded portion 13 so as to be continuous with each of the plurality of through holes 12c provided in the second conductive plate 12 (see FIG. 1B).

  The resin molding portion 13 is provided with an insulating wall 15 that protrudes from a portion between the exposed portion of the surface of the first conductive plate 11 and the exposed portion of the surface of the second conductive plate 12. The insulating wall 15 is continuously formed so as to meander between the first conductive plate 11 and the second conductive plate 12 which are arranged so that the other convex portion enters the one concave portion. By this insulating wall 15, the lower surface of the resin molding portion 13 is divided into a region where the protruding piece 11 b of the first conductive plate 11 on the positive electrode side is exposed and a region where the protruding piece 12 b of the second conductive plate 12 on the negative electrode side is exposed. It is partitioned. Here, the insulation distance between the exposed portion of the first conductive plate 11 and the exposed portion of the second conductive plate 12 is the distance from the exposed portion of the first conductive plate 11 to the tip of the insulating wall 15 (spatial distance or creepage distance). ) And the creeping distance of the front end surface of the insulating wall 15 and the distance (space distance or creeping distance) from the exposed portion of the second conductive plate 12 to the front end portion of the insulating wall 15. Therefore, if the protruding amount of the insulating wall 15 is increased, the insulating property between the exposed portion of the first conductive plate 11 and the exposed portion of the second conductive plate 12 is not increased without increasing the size of the resin molded portion 13 in the planar direction. Can be increased.

  The two terminals 11 d provided on the first conductive plate 11 and the two terminals 12 d provided on the second conductive plate 12 protrude downward from the lower surface of the resin molding portion 13. The two terminals 11d and the two terminals 12d are provided so as to be parallel to each other and protrude downward from the lower surface of the resin molded portion 13. An external electric circuit (for example, the inverter module 4 shown in FIG. 6) to which the capacitor block 1 of the present embodiment is attached has, for example, a connector for plug connection (not shown) and a screw type terminal block (not shown). Is provided. The terminals 11d and 12d are connected to an external electric circuit in a detachable state by being inserted into a connector for insertion connection, or inserted into a screw-type terminal block and then tightened with a screw.

  The capacitor block 1 insert-molds the first conductive plate 11 and the second conductive plate 12, holds the first conductive plate 11 and the second conductive plate 12 in the resin molded portion 13, and then forms the resin molded portion 13. The first terminals 10a of the plurality of capacitors 10 are inserted into the through holes 13a and 11c and the second terminal 10b is inserted into the through holes 13b and 12c, respectively. Thereafter, the first terminal 10a protruding downward from the protruding piece 11b is soldered to the protruding piece 11b, and the second terminal 10b protruding downward from the protruding piece 12b is soldered to the protruding piece 12b. Is fixed in a state of being electrically connected to the first conductive plate 11 and the second conductive plate 12.

  As described above, the capacitor block 1 of the present embodiment includes the plurality of capacitors 10, the first conductive plate 11, the second conductive plate 12, and the resin molded portion 13, and the surface of the resin molded portion 13. An insulating wall 15 is provided on the surface. A first terminal 10 a included in each of the plurality of capacitors 10 is electrically connected to the first conductive plate 11. The second conductive plate 12 is electrically connected to a second terminal 10b included in each of the plurality of capacitors 10. The resin molded portion 13 has a portion where the portion where the first terminal 10a is connected on the surface of the first conductive plate 11 and the portion where the second terminal 10b is connected on the surface of the second conductive plate 12 are exposed from one surface. Thus, the first conductive plate 11 and the second conductive plate 12 are insert-molded. An insulating wall 15 that protrudes from a portion between the exposed portion of the first conductive plate 11 and the exposed portion of the second conductive plate 12 is provided on the surface of the resin molding portion 13.

  Thus, the exposed portion of the first conductive plate 11 (the portion to which the first terminal 10a is connected) and the exposed portion of the second conductive plate 12 (the second terminal 10b) are connected to the surface of the resin molded portion 13. An insulating wall 15 that protrudes from a portion between the two portions) is provided. When a small capacitor is used as the capacitor 10, the distance between the first terminal 10a and the second terminal 10b is reduced, but the first conductive plate 11, the first terminal 10a, and the second conductive plate 12 are separated by the insulating wall 15. And since the insulation distance with the 2nd terminal 10b becomes large, insulation is improved. Moreover, since the insulating wall 15 is provided integrally with the resin molding portion 13, a member for enhancing the insulation between the first conductive plate 11 and the first terminal 10a and the second conductive plate 12 and the second terminal 10b. The capacitor block can be downsized as compared with the case where is provided as a separate part. Further, even if a small capacitor having a relatively small distance between the first terminal 10a and the second terminal 10b is used, the insulating property is enhanced by providing the insulating wall 15, so that a plurality of capacitors can be used. 10 can be arranged closer to each other, and the capacitor block can be reduced in size.

  In the capacitor block 1 of the present embodiment, the first conductive plate 11 and the second conductive plate 12 are each formed in a comb-teeth shape in plan view. The first conductive plate 11 and the first conductive plate 11 and the second conductive plate 12 so that the convex portion provided in the other of the first conductive plate 11 and the second conductive plate 12 enters the concave portion provided in one of the first conductive plate 11 and the second conductive plate 12. A second conductive plate 12 is disposed. That is, the convex portion (protruding piece 12b) of the second conductive plate 12 enters the concave portion of the first conductive plate 11 (the portion between the adjacent protruding pieces 11b), and the concave portion of the second conductive plate 12 (adjacent protruding piece 12b). The first conductive plate 11 and the second conductive plate 12 are arranged so that the convex portion (projection piece 11b) of the first conductive plate 11 enters the portion between the first conductive plate 11 and the first conductive plate 11.

  Thereby, compared with the case where the several capacitor | condenser 10 is arranged in a line, although the width dimension of the capacitor | condenser block 1 spreads, full length can be shortened. Further, in the present embodiment, the plurality of capacitors 10 are arranged in a plurality of rows, and the capacitors 10 in adjacent rows are arranged in a staggered manner with their positions shifted by a half in the arrangement direction. In this manner, since the plurality of capacitors 10 are arranged in a hexagonal manner, the number of capacitors 10 can be maximized if the area is the same, and the capacitor block 1 can be downsized.

  In the capacitor block 1 of the present embodiment, the first conductive plate 11 and the second conductive plate 12 are each provided with connection portions (terminals 11d and 12d) for detachably connecting to an external electric circuit. It is also preferable. Since the connecting portion of the capacitor block 1 is detachably connected to an external electric circuit, the capacitor block 1 can be easily replaced when the performance of the capacitor block 1 becomes poor.

  Further, in the capacitor block 1 of the present embodiment, the connection portion may be terminals 11d and 12d formed by cutting and raising a part of the metal plates constituting the first conductive plate 11 and the second conductive plate 12, respectively. preferable. When the first conductive plate 11 and the terminal 11d are separate parts, assembly work is required, but the terminal 11d is formed by cutting and raising a part of the metal plate constituting the first conductive plate 11. Can be easily done. Similarly, when the second conductive plate 12 and the terminal 12d are separate parts, assembly work is required, but the terminal 12d is formed by cutting and raising a part of the metal plate constituting the second conductive plate 12. Therefore, the manufacturing effort can be simplified.

DESCRIPTION OF SYMBOLS 1 Capacitor block 10 Capacitor 10a 1st terminal 10b 2nd terminal 11 1st electroconductive board 12 2nd electroconductive board 13 Resin molding part 15 Insulation wall

Claims (4)

A plurality of capacitors;
A first conductive plate to which a first terminal included in each of the plurality of capacitors is electrically connected;
A second conductive plate to which a second terminal included in each of the plurality of capacitors is electrically connected;
The first conductive plate in a state where a portion to which the first terminal is connected on the surface of the first conductive plate and a portion to which the second terminal is connected on the surface of the second conductive plate are exposed from one surface. The second conductive plate is provided with a resin molded part formed by insert molding,
A capacitor block, wherein an insulating wall projecting from a portion between an exposed portion of the first conductive plate and an exposed portion of the second conductive plate is provided on a surface of the resin molded portion. Each of the first conductive plate and the second conductive plate has a comb-like shape in plan view,
The first conductive plate and the first conductive plate and the second conductive plate so that the convex portion provided in the other of the first conductive plate and the second conductive plate enters the concave portion provided in one of the first conductive plate and the second conductive plate. The capacitor block according to claim 1, wherein the second conductive plate is disposed.   3. The connection part according to claim 1, wherein the first conductive plate and the second conductive plate are each provided with a connecting portion for detachably connecting to an external electric circuit. 4. Capacitor block.   4. The capacitor block according to claim 3, wherein the connection portion is a terminal formed by cutting and raising a part of a metal plate constituting each of the first conductive plate and the second conductive plate.

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