CN215955105U

CN215955105U - Three-level multi-electrode dry-type direct-current filter capacitor

Info

Publication number: CN215955105U
Application number: CN202121725173.1U
Authority: CN
Inventors: 陈忠友; 方志; 王玉申
Original assignee: Ningguo Yuhua Appliance Co ltd
Current assignee: Ningguo Yuhua Appliance Co ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2022-03-04
Anticipated expiration: 2031-07-28

Abstract

The utility model discloses a three-level multi-electrode dry type direct current filter capacitor, which comprises: a capacitor body and a housing; the capacitor body is arranged inside the shell; the capacitor body comprises a busbar group, wherein the busbar group comprises an upper busbar, a lower busbar and a side busbar connecting the upper busbar and the lower busbar; a plurality of capacitor core groups are arranged between the upper bus bar and the lower bus bar, and each capacitor core group comprises a first core group provided with a first electrode and a second core group provided with a second electrode; and a plurality of third electrodes corresponding to the capacitor core group are arranged on the side bus bar. According to the utility model, the capacitor core groups are arranged between the upper bus bar and the lower bus bar, so that one group of three-level inverter circuit or a plurality of groups of three-level inverter circuits only need one capacitor, and the installation space of the filter is effectively saved.

Description

Three-level multi-electrode dry-type direct-current filter capacitor

Technical Field

The utility model relates to the field of filters, in particular to a three-level multi-electrode dry type direct current filter capacitor.

Background

The dry-type direct current filter capacitor product has excellent service life and safety performance, and is widely applied to power circuit design in industries such as frequency converters, SVG (static var generator), UPS (uninterrupted power supply), electric vehicles, hybrid vehicles, electroplating power supplies, inverter welding machines, inverter power supplies, induction heating equipment, high-power high-frequency switching power supplies, elevator motor drives, solar/wind power generation converters and the like. The three-level inverter circuit has the advantages that the output PWM wave is closer to a sine wave, the ripple current is smaller and less, the switching loss is smaller, the service life of the IGBT is more reliable, the frequency is higher and the like, and the three-level inverter circuit is a great trend for the development of future inverter circuits. The conventional three-level inverter circuit has the disadvantages of large occupied size, poor filtering effect, high cost and the like because a bus direct-current filter capacitor is mostly combined by a plurality of two-level capacitors.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems in the background art, the utility model provides a three-level multi-electrode dry type direct current filter capacitor, which effectively solves the problems of large size, poor filtering effect, high cost and the like of a bus direct current filter capacitor in the existing three-level inverter circuit.

The utility model provides a three-level multi-electrode dry type direct current filter capacitor, which comprises: a capacitor body and a housing; the capacitor body is arranged inside the shell; the capacitor body comprises a busbar group, wherein the busbar group comprises an upper busbar, a lower busbar and a side busbar connecting the upper busbar and the lower busbar; go up female arranging and arrange between the female row down and have a plurality of condenser core group, every condenser core group is equipped with the third electrode that a plurality of and condenser core group correspond including the first core group that is equipped with first electrode and the second core group that is equipped with the second electrode on the female row of side.

Preferably, the first core group comprises an upper core and a lower core which are distributed up and down, a first bus bar is arranged at the bottom of the upper core, a second bus bar is arranged at the top of the lower core, the first bus bar and the second bus bar are parallel to each other and are connected through a third bus bar arranged on the side edge of the core, and a first electrode is arranged on one side of the third bus bar, which is far away from the core; the second core group is including being upper core and lower floor's core that distributes from top to bottom, and upper core bottom is equipped with the fourth and arranges that the core top of lower floor is equipped with the fifth mother arranges, and the fourth is arranged to be parallel to each other and arranges through setting up the sixth that arranges at the core side with the fifth and is connected, and the core one side is kept away from to the sixth mother arranges and is equipped with the second electrode.

Preferably, the side busbar is provided with a first through hole and a second through hole which are respectively adjacent to the third electrode left and right.

Preferably, the first electrode passing through the first through hole, the second electrode passing through the second through hole and the third electrode are disposed on one side of the side busbar away from the capacitor core group.

Preferably, a first insulating layer is arranged between the capacitor core group and the side busbar; the first insulating layer is provided with openings matched with the first through hole and the second through hole.

Preferably, a second insulating layer is arranged between the first core group and the second core group.

Preferably, the shell is a square shell with an opening on one side, and the first electrode, the second electrode and the third electrode are arranged at the opening of the shell and protrude out of the shell.

Preferably, the bottom of the housing protrudes from the outer side wall, and a reinforcing rib is arranged between the bottom and the outer side wall.

Preferably, the top outside of the shell is provided with a mounting part, and the bottom of the shell protrudes from the outer side wall part and is provided with a mounting hole.

Preferably, the space between the case and the capacitor body is filled with epoxy resin.

According to the utility model, the capacitor core groups are arranged between the upper bus bar and the lower bus bar, so that one group of three-level inverter circuit or a plurality of groups of three-level inverter circuits only need one capacitor, and the installation space of the filter is effectively saved.

According to the utility model, the capacitor core group is connected in the capacitor through the busbar, and the outside of the capacitor is directly connected with the control module IGBT, so that an external connecting wire is omitted, the cost is reduced, the efficiency is improved, and the misoperation is reduced.

Drawings

FIG. 1 is a schematic structural diagram of a capacitor body according to an embodiment of the present invention;

FIG. 2 is an exploded view of the capacitor body according to the embodiment of the present invention;

fig. 3 is a schematic structural view of a capacitor core pack according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of the first core pack according to the embodiment of the present invention;

FIG. 5 is a schematic structural view illustrating a second core pack according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a dc filter capacitor according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a housing in an embodiment of the utility model.

Detailed Description

The embodiment of the utility model provides a three-level multi-electrode dry type direct current filter capacitor, which comprises: a capacitor body and a case 2; the capacitor body is arranged inside the shell 2;

as shown in fig. 2, the capacitor body includes a busbar group 3, the busbar group 3 includes an upper busbar 301, a lower busbar 302, and a side busbar 303 connecting the upper busbar 301 and the lower busbar 302; five capacitor core groups 1 are arranged between the upper busbar 301 and the lower busbar 302, and five third electrodes 304 corresponding to the capacitor core groups 1 are arranged on the side busbar 302;

as shown in fig. 3, the capacitor core pack 1 includes a first core pack 11 provided with a first electrode 111 and a second core pack 12 provided with a second electrode 121, and the first electrode 111 and the second electrode 121 are respectively installed at both sides of a third electrode 304 as shown in fig. 1.

In this embodiment, the five capacitor core groups include five first core groups and five second core groups, and the first core groups and the second core groups are installed between the upper busbar and the lower busbar in a staggered manner.

It should be noted that, in the embodiment of the present invention, five groups of three-level inverter circuits integrated by five first core groups and five second core groups are a typical capacitor structure, and in other embodiments, the number of capacitor core groups can be determined based on actual requirements, and the groups of three-level inverter circuits can be integrated into a plurality of groups.

As shown in fig. 4 and 5, in this embodiment, the first core group 11 includes an upper core and a lower core which are distributed vertically, a first bus bar 113 is disposed at the bottom of the upper core, a second bus bar 112 is disposed at the top of the lower core, the first bus bar 113 and the second bus bar 112 are parallel to each other and are connected through a third bus bar 114 disposed at a side of the core, and a first electrode 111 is disposed at a side of the third bus bar 114 away from the core; the second core group 12 comprises an upper core and a lower core which are vertically distributed, a fourth busbar 123 is arranged at the bottom of the upper core, a fifth busbar 122 is arranged at the top of the lower core, the fourth busbar 123 and the fifth busbar 122 are parallel to each other and are connected through a sixth busbar 124 arranged on the side edge of the core, and a second electrode 121 is arranged on one side of the sixth busbar 124 away from the core.

In this embodiment, the upper core and the lower core each include six cores, the six cores are distributed in two rows and three rows, and the six cores on the upper layer and the six cores on the lower layer are axially overlapped correspondingly.

As shown in fig. 2, in the present embodiment, the side busbar 302 is provided with a first through hole 305 and a second through hole 306 adjacent to the third electrode 304 on the left and right, and it should be noted that in the present embodiment, five third electrodes 304 are provided, that is, each third electrode is provided with a first through hole and a second through hole on the left and right, and therefore, there are also five corresponding first through holes and second through holes.

As shown in fig. 1, in the present embodiment, the first electrode 111 passing through the first through hole 305, the second electrode 121 passing through the second through hole 306, and the third electrode 304 are located on the side of the side busbar 303 away from the capacitor core group 1.

As shown in fig. 2, in the present embodiment, a first insulating layer 307 is provided between the capacitor core pack 1 and the side busbar 302 to prevent short circuit; the first insulating layer 307 is provided with openings matching the first and

second vias

305, 306 so that the first and second electrodes pass through the insulating layer and then pass through the first and second vias on the side busbar.

In this embodiment, a second insulating layer 13 is disposed between the first core pack and the second core pack to prevent a short circuit.

As shown in fig. 6 and 7, in this embodiment, the housing 2 is a square casing with an opening on one side, and the first electrode 111, the second electrode 121, and the third electrode 304 are disposed at the opening of the housing 2 and protrude from the housing 2.

In this embodiment, the bottom of the housing 2 protrudes from the outer sidewall, and a reinforcing rib 201 is disposed between the bottom and the outer sidewall.

In this embodiment, the top outer side of the housing 2 is provided with a mounting member 202, and the bottom of the housing 2 protrudes from the outer side wall to form a mounting hole 203.

In this embodiment, epoxy resin is filled between the case 2 and the capacitor body.

In the utility model, the shell 2 is made of ABS, PPS or PC + ABS plastic.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1. A three-level multi-electrode dry-type dc filter capacitor, comprising: a capacitor body and a housing (2); the capacitor body is arranged inside the shell (2); the capacitor body comprises a busbar group (3), wherein the busbar group (3) comprises an upper busbar (301), a lower busbar (302) and a side busbar (303) which is connected with the upper busbar (301) and the lower busbar (302); a plurality of capacitor core groups (1) are arranged between the upper busbar (301) and the lower busbar (302), and each capacitor core group (1) comprises a first core group (11) provided with a first electrode (111) and a second core group (12) provided with a second electrode (121); the side busbar (303) is provided with a plurality of third electrodes (304) corresponding to the capacitor core group (1).

2. The direct-current filter capacitor as claimed in claim 1, wherein the first core group (11) comprises an upper core and a lower core which are distributed up and down, a first busbar (113) is arranged at the bottom of the upper core, a second busbar (112) is arranged at the top of the lower core, the first busbar (113) and the second busbar (112) are parallel to each other and are connected through a third busbar (114) arranged at the side of the core, and a first electrode (111) is arranged at one side of the third busbar (114) far away from the core; the second core group (12) is including being upper core and lower floor's core that distributes from top to bottom, and upper core bottom is equipped with the fourth and arranges (123), and lower floor's core top is equipped with the fifth and arranges (122), and the fourth is arranged (123) and is arranged (122) to be parallel to each other and be connected through setting up at the sixth of core side and arranging (124) each other with the fifth, and the core one side is kept away from in the sixth of arranging (124) and is equipped with second electrode (121).

3. The direct-current filter capacitor as claimed in claim 1, wherein the side busbar (303) is provided with a first through hole (305) and a second through hole (306) which are respectively adjacent to the third electrode (304) in the left-right direction.

4. The direct current filter capacitor according to claim 3, wherein the first electrode (111) passing through the first through hole (305), the second electrode (121) passing through the second through hole (306) and the third electrode (304) are disposed on a side of the side busbar (303) away from the capacitor core assembly (1).

5. The direct current filter capacitor according to claim 3, wherein a first insulating layer (307) is arranged between the capacitor core group (1) and the side busbar (303); the first insulating layer (307) is provided with openings matching the first via (305) and the second via (306).

6. The dc filter capacitor according to claim 1, wherein a second insulating layer (13) is provided between the first and second core groups.

7. The direct current filter capacitor of claim 1, wherein the housing (2) is a square case with an opening on one side, and the first electrode (111), the second electrode (121) and the third electrode (304) are disposed at the opening of the housing (2) and protrude from the housing (2).

8. A DC filter capacitor according to claim 7, characterized in that the bottom of the housing (2) protrudes from the outer side wall, and that a reinforcement rib (201) is provided between the bottom and the outer side wall.

9. The direct current filter capacitor of claim 8, wherein the top outer side of the housing (2) is provided with a mounting member (202), and the bottom of the housing (2) is provided with a mounting hole (203) protruding from the outer side wall.

10. The direct current filter capacitor according to claim 1, characterized in that epoxy resin is filled between the housing (2) and the capacitor body.