CN113496822B - Regular hexagonal direct current filter capacitor - Google Patents

Abstract

The present invention discloses a regular hexagonal DC filter capacitor, comprising: a shell and a capacitor body; the shell is a regular hexagonal annular shell with an open top surrounded by a bottom surface and two side walls; the capacitor body comprises a capacitor core group and a positive busbar and a negative busbar sequentially stacked on one side thereof, the capacitor core group is a regular hexagonal annular core group surrounded by a plurality of cores, and the positive busbar and the negative busbar are regular hexagonal annular busbars; the capacitor body is installed inside the shell, and the positive busbar and the negative busbar are arranged on one side close to the opening of the shell. The present invention proposes a regular hexagonal DC filter capacitor, which effectively reduces the volume of the filter capacitor and increases the service life of the capacitor.

Description

A regular hexagonal DC filter capacitor

Technical Field

The invention relates to the field of capacitors, and in particular to a regular hexagonal direct current filter capacitor.

Background Art

The performance of the motor controller of new energy vehicles is greatly affected by the filter design. The filters currently used in new energy motor controllers are mainly bus DC filters, but there are the following problems: First, the bus DC filter capacitors of existing new energy vehicle motor controllers are rectangular in shape, which limits the spatial layout of the motor controller; second, the rectangular shape of the existing bus DC filter capacitors makes it difficult to share water cooling pipes with the control module, requiring larger space and higher costs. Third, the bus DC filter capacitors of existing new energy vehicle motor controllers cannot achieve uniform distribution of capacitor stray inductance; fourth, when the existing DC filter capacitors are working, the ripple current cannot be evenly distributed inside the capacitor, affecting the service life;

Summary of the invention

In order to solve the technical problems existing in the background technology, the present invention proposes a regular hexagonal DC filter capacitor, which effectively reduces the volume of the filter capacitor and increases the service life of the capacitor.

The present invention provides a regular hexagonal DC filter capacitor, comprising: a shell and a capacitor body; the shell is a regular hexagonal annular shell with an open top surrounded by a bottom surface and two side walls; the capacitor body comprises a capacitor core group and a positive busbar and a negative busbar sequentially stacked on one side thereof, the capacitor core group is a regular hexagonal annular core group surrounded by a plurality of cores, and the positive busbar and the negative busbar are regular hexagonal annular busbars; the capacitor body is installed inside the shell, and the positive busbar and the negative busbar are arranged on one side close to the opening of the shell.

Preferably, a plurality of first limiting posts are provided on the outer edge of the positive busbar near the capacitor core group, a plurality of second limiting posts are provided on the inner edge of the negative busbar near the capacitor core group, and the capacitor core group is fixed between the first limiting posts and the second limiting posts.

Preferably, an AC pin is provided on each side of the outer edge of the positive busbar, and an AC pin is provided on each side of the outer edge of the negative busbar; the AC pins of the positive busbar and the negative busbar on the same side are staggered in the axial direction.

Preferably, the six AC pins of the positive busbar are symmetrically distributed about the center of a regular hexagon, and the six AC pins of the negative busbar are symmetrically distributed about the center of the regular hexagon.

Preferably, the AC pin protrudes from the outer side wall of the shell in a step shape.

Preferably, the port on each side of the outer side wall of the housing is provided with a first limiting groove matching with the AC pin of the positive busbar and a second limiting groove matching with the AC pin of the negative busbar.

Preferably, a first DC lead-out terminal is provided on one side of the outer edge of the positive busbar, and a second DC lead-out terminal is provided on one side of the outer edge of the negative busbar; the first DC lead-out terminal and the second DC lead-out terminal are located on the same side and are staggered in the axial direction.

Preferably, the first DC lead-out terminal and the second DC lead-out terminal protrude from the housing and are folded downward.

Preferably, a connecting portion matching the first DC lead-out terminal and the second DC lead-out terminal is provided on one side surface of the outer side wall of the shell; a connecting hole is provided on the connecting portion; and a connecting piece is provided in the connecting hole.

Preferably, a regular hexagonal ring-shaped insulating layer is provided between the positive busbar and the negative busbar.

In the present invention, the capacitor body uses a capacitor core group in a regular hexagonal ring formed by a plurality of cores, so that the core group is symmetrically distributed about the center of the regular hexagon. Six groups of AC lead terminals are also symmetrically distributed about the center of the regular hexagon, ensuring that the stray inductance and ripple current generated when the capacitor is working are perfectly evenly distributed inside the capacitor, thereby improving the performance and service life of the capacitor.

In the present invention, by providing an insulating layer between the positive busbar and the negative busbar, short circuit can be effectively prevented; by providing limiting feet on the positive busbar and the busbar, the capacitor core group is effectively fixed, which facilitates the installation of the capacitor body.

In the present invention, the capacitor body is a regular hexagon and is contained in a regular hexagonal shell, which effectively reduces the volume of the filter capacitor; and the shell is an annular hexagonal structure, and the hexagonal through hole in the middle of the shell can be used to install a PCB control board, breaking the traditional flat layout of the DC filter capacitor, the control module IGBT, and the control PCB board, making the space layout more reasonable and the space utilization rate high.

The regular hexagonal DC filter capacitor proposed in the present invention has a stacked structure in which the control PCB board is located in the middle hexagonal space of the DC filter capacitor; the control module IGBT and the filter capacitor can share a cold water cooling channel, which significantly reduces the hot spot temperature of the filter capacitor, that is, under the same capacitance value, it can withstand a larger ripple current or under the same ripple current requirement, only a smaller capacitance value is required; the performance of the capacitor is effectively improved, the capacitance value is reduced, the volume is reduced, space is saved, and the cost is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is an exploded structural diagram of a regular hexagonal DC filter capacitor according to an embodiment of the present invention;

FIG2 is a general assembly structure diagram of a regular hexagonal DC filter capacitor proposed in an embodiment of the present invention;

FIG3 is a schematic diagram of the structure of a capacitor body according to an embodiment of the present invention;

FIG4 is a schematic diagram of the structure of a housing according to an embodiment of the present invention;

FIG. 5 is an electrical connection diagram of a regular hexagonal DC filter capacitor according to an embodiment of the present invention.

DETAILED DESCRIPTION

As shown in FIG. 1 , FIG. 1 is an exploded structural diagram of a regular hexagonal DC filter capacitor proposed in an embodiment of the present invention;

1 , a regular hexagonal DC filter capacitor proposed in an embodiment of the present invention comprises: a shell 1 and a capacitor body; the shell 1 is a regular hexagonal annular shell with an open top surrounded by a bottom surface and two side walls; the capacitor body comprises a capacitor core group 2 and a positive busbar 3 and a negative busbar 5 stacked sequentially on one side thereof, the capacitor core group is a regular hexagonal annular core group surrounded by a plurality of cores, and the positive busbar 3 and the negative busbar 5 are regular hexagonal annular busbars; the capacitor body is installed inside the shell 1, and the positive busbar 3 and the negative busbar 5 are arranged on the opening side close to the shell 1.

In this embodiment, three separate cores are arranged to form a core group, which includes six core groups in total. The six core groups are symmetrically distributed in a regular hexagon inside the capacitor.

As shown in Figure 1, in this embodiment, a plurality of first limiting posts 303 are provided on the outer edge of the positive busbar 3 near the capacitor core group, and a plurality of second limiting posts 503 are provided on the inner edge of the negative busbar 5 near the capacitor core group, and the capacitor core group 2 is fixed between the first limiting posts 303 and the second limiting posts 503.

It should be noted that in other embodiments of the present invention, the limiting column is not necessarily arranged at the outer edge of the positive busbar or the inner edge of the negative busbar; for example, it can be arranged at the inner edge of the positive busbar and the outer edge of the negative busbar, or the limiting feet can be arranged at the inner and outer edges of the positive busbar or the negative busbar, as long as the purpose of limiting the capacitor core group can be achieved.

As shown in Figures 1 and 3, in this embodiment, an AC pin 301 is provided on each side of the outer edge of the positive busbar 3, and an AC pin 501 is provided on each side of the outer edge of the negative busbar 5; the AC pins of the positive busbar 3 and the negative busbar 5 on the same side are staggered in the axial direction.

In this embodiment, the six AC pins 301 of the positive busbar 3 are symmetrically distributed about the center of a regular hexagon, and the six AC pins 501 of the negative busbar 5 are symmetrically distributed about the center of a regular hexagon.

In the present invention, the capacitor body uses a capacitor core group in a regular hexagonal ring formed by a plurality of cores, so that the core group is symmetrically distributed about the center of the regular hexagon. And its AC lead-out terminals are also symmetrically distributed about the center of the regular hexagon; it ensures that the stray inductance and ripple current generated when the capacitor is working are perfectly evenly distributed inside the capacitor, thereby improving the performance and service life of the capacitor.

In this embodiment, the AC pins protrude from the outer wall of the housing in a step shape.

As shown in FIG4 , in this embodiment, the ports on each side of the outer wall of the housing 1 are provided with a first limiting groove 101 matching the AC pin 301 of the positive busbar and a second limiting groove 102 matching the AC pin 501 of the negative busbar; in this embodiment of the present invention, the depth of the first limiting groove 101 is greater than the depth of the second limiting groove 102; it should be noted that in this embodiment, since the positive busbar 3 is stacked below the negative busbar 5, the depth of the first limiting groove is greater than the depth of the second limiting groove, so that the positive busbar and the negative busbar are more compatible. At the same time, the housing also plays a certain role in limiting and fixing the positive busbar and the negative busbar.

As shown in FIG. 1 and FIG. 3 , in this embodiment, a first DC lead-out terminal 302 is provided on one side of the outer edge of the positive busbar 3, and a second DC lead-out terminal 502 is provided on one side of the outer edge of the negative busbar 5; the first DC lead-out terminal 302 and the second DC lead-out terminal 502 are located on the same side and are staggered in the axial direction;

In this embodiment, the first DC lead-out terminal 302 and the second DC lead-out terminal 502 protrude from the housing and are folded downward.

In this embodiment, a connecting portion 106 matching the first DC lead-out terminal and the second DC lead-out terminal is provided on one side of the outer wall of the housing 1; a connecting hole 107 is provided on the connecting portion; and a connecting piece 108 is provided in the connecting hole.

Specifically, in this embodiment, as shown in Figure 4, the connecting hole 107 is a regular hexagonal shape, and the connecting piece 108 is a hexagonal nut. As shown in Figure 2, the positive busbar DC pin 302 and the negative busbar DC pin 502 are folded downward outside the shell and located outside the connecting part, and a hexagonal nut is arranged inside the connecting part. The other connecting ends can be connected to the DC pins by connecting with the hexagonal nuts.

In this embodiment, an insulating layer 4 is provided between the positive busbar and the negative busbar to prevent short circuit; it should be noted that, in this embodiment, the insulating layer 4 is a regular hexagonal ring-shaped insulating paper.

As shown in FIG. 2 and FIG. 4 , in this embodiment, a regular hexagonal through hole 110 is provided at the bottom of the shell 1 , and the through hole is provided with a through hole side wall folded toward the shell opening direction, so that the shell 1 forms a regular hexagonal annular shell with an opening at the top.

In the present invention, the capacitor body is a regular hexagon and is contained in a regular hexagonal shell, which effectively reduces the volume of the filter capacitor; and the shell is an annular hexagonal structure, and the middle hexagonal through hole can be used to install a PCB control board, so that the control module IGBT and the filter capacitor share a cold water cooling channel, which limits and reduces the hot spot temperature of the filter capacitor and effectively improves the performance of the capacitor.

As shown in Figure 4, in this embodiment, the six corners of the outer wall of the shell 1 are recessed inward to form a mounting groove 103, and a mounting plate 104 is provided near the opening direction of the shell, and a mounting hole 105 is provided on the mounting plate; it should be noted that, as shown in the figure, a mounting part that can be directly installed is provided in the mounting hole, which is generally a cylindrical copper insert; correspondingly, in this embodiment, the six corners of the outer edge of the positive busbar 3 and the negative busbar 5 are provided with grooves matching the mounting grooves, which facilitates the installation of the filter capacitor.

In this embodiment, the outer shell is made of ABS, PPS or PC+ABS plastic, and epoxy resin is used to fill the space between the outer shell and each core group inside.

In this embodiment, the positive busbar and the negative busbar are integrated one-piece busbars; they are assembled with the capacitor core group to form a capacitor body; the combined capacitor body is then assembled into a housing and encapsulated with epoxy resin to form a complete product.

As shown in Figure 5, Figure 5 is an electrical connection diagram of the DC filter capacitor proposed by the present invention, wherein the lead terminals a and b are the DC lead terminals of the positive busbar 3 and the negative busbar 5, respectively, and the lead terminals c, e, g, i, k, m and d, f, h, j, l, n are the AC lead terminals of the positive busbar 3 and the negative busbar 5, respectively.

The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims (7)

1. A regular hexagonal direct current filter capacitor, comprising: a housing (1) and a capacitor body; the shell (1) is a regular hexagonal annular shell with an opening at the top and surrounded by a bottom surface and two side walls; the bottom of the shell (1) is provided with a regular hexagon through hole (110) for installing a PCB, the through hole (110) is provided with a through hole side wall folded towards the opening direction of the shell (1), the capacitor body comprises a capacitor core group (2), and a positive electrode busbar (3) and a negative electrode busbar (5) which are sequentially stacked on one side of the capacitor core group, the capacitor core group is a regular hexagon annular core group surrounded by a plurality of cores, the winding axis of each capacitor is perpendicular to the axis of the shell, and the positive electrode busbar (3) and the negative electrode busbar (5) are regular hexagon annular busbars; the capacitor body is installed inside shell (1), positive electrode busbar (3) and negative electrode busbar (5) are established in being close to the opening one side of shell (1), one of them side of positive electrode busbar (3) outward flange is equipped with first direct current and draws forth end (302), one of them side of negative electrode busbar (5) outward flange is equipped with second direct current and draws forth end (502), first direct current draws forth end (302) and second direct current and draws forth end (502) and lie in same side and in the crisscross arrangement in the axial, first direct current draws forth end (302) and second direct current and draws forth end (502) to bulge in the shell and fold downwards, and one of them side of shell (1) lateral wall is equipped with and first direct current draws forth end (302) and second direct current draws forth end (502) assorted connecting portion (106), and connecting portion is equipped with connecting hole (107), is equipped with connecting piece (108) in connecting hole (107).

2. The direct current filter capacitor according to claim 1, wherein a plurality of first limiting posts (303) are arranged on one side, close to the capacitor core group, of the outer edge of the positive electrode busbar (3), a plurality of second limiting posts (503) are arranged on one side, close to the capacitor core group, of the inner edge of the negative electrode busbar (5), and the capacitor core group (2) is fixed between the first limiting posts (303) and the second limiting posts (503).

3. The direct current filter capacitor according to claim 1, wherein each side of the outer edge of the positive busbar (3) is provided with an alternating current pin (301), and each side of the outer edge of the negative busbar (5) is provided with an alternating current pin (501); alternating current pins of the positive electrode busbar (3) and the negative electrode busbar (5) positioned on the same side are staggered in the axial direction.

4. A dc filter capacitor according to claim 3, characterized in that the six ac pins (301) of the positive busbar (3) are symmetrically distributed about the center of the regular hexagon and the six ac pins (501) of the negative busbar (5) are symmetrically distributed about the center of the regular hexagon.

5. A dc filter capacitor as claimed in claim 3, wherein the ac pins are stepped to protrude from the outer side wall of the housing.

6. A dc filter capacitor according to claim 3, characterized in that the ports on each side of the outer side wall of the housing (1) are provided with a first limit groove (101) matching the ac pins (301) of the positive busbar and a second limit groove (102) matching the ac pins (501) of the negative busbar.

7. The direct current filter capacitor according to claim 1, characterized in that an insulating layer (4) in a regular hexagonal ring is arranged between the positive busbar (3) and the negative busbar (5).