Power module parallel current-sharing output copper bar

Abstract

The utility model relates to the technical field of power module copper bar connection, in particular to a power module parallel current-sharing output copper bar. Comprising a copper bar output part which is of a strip-shaped structure; the first end of each copper bar main path part is connected with the copper bar output part along the length direction of the copper bar output part; and a plurality of copper bar branch circuit parts, wherein the second end of each copper bar main circuit part is connected with the plurality of copper bar branch circuit parts. According to the utility model, complex processes such as bending are reduced, the manufacturing cost is reduced, good fixation with the power module is realized through the copper bar branch part, a complete contact surface between the copper bar and a terminal of the power module during installation is ensured, and the cooper bar and stray inductance from the module to an output end are kept consistent, so that the consistency of output current of the power module is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of power module copper busbar connection, in particular to a module parallel current-sharing output copper busbar. Background Art

[0002] Currently, high-power centralized photovoltaic inverters on the market all require the use of power modules such as IGBT modules to operate. When designing, the IGBT modules are connected in parallel. However, in the parallel connection, the unreasonable structure or improper layout of the output copper busbar causes uneven distribution of the stray inductance (misleading inductance) of the output copper busbar. The ensuing problem is that during the parallel connection of the IGBT modules, the power devices will experience uneven current distribution due to uneven distribution of the output copper busbar's misleading inductance or errors during installation. Different IGBT modules will be affected by different degrees of misleading inductance, resulting in uneven current. Utility Model Content

[0003] The purpose of this utility model is to provide a power module parallel current equalization output copper bus to solve the above technical problems;

[0004] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0005] A power module parallel current-sharing output copper busbar, comprising:

[0006] A copper busbar output portion, wherein the copper busbar output portion is a bar-shaped structure;

[0007] A plurality of copper busbar main path portions, wherein a first end of each of the copper busbar main path portions is connected to the copper busbar output portion along a length direction of the copper busbar output portion;

[0008] A plurality of copper busbar branch portions are provided, and the second end of each copper busbar main portion is connected to a plurality of copper busbar branch portions.

[0009] Preferably, the copper busbar output portion, the plurality of copper busbar main portions and the plurality of copper busbar branch portions are arranged on the same plane.

[0010] Preferably, the copper busbar branch part and the copper busbar main part are both strip-shaped structures, the axis of the copper busbar branch part and the axis of the connected copper busbar main part have a certain angle, and the copper busbar main part and the connected copper busbar branch part form a claw-shaped structure.

[0011] Preferably, the copper busbar main path portion includes a first copper busbar main path portion vertically connected to the first end of the copper busbar output portion and a second copper busbar main path portion vertically connected to the second end of the copper busbar output portion.

[0012] Preferably, the second end of each copper busbar branch portion is connected to the same number of copper busbar branch portions.

[0013] Preferably, the second end of each copper busbar branch portion is connected to two copper busbar branch portions, and the two copper busbar branch portions are symmetrically arranged.

[0014] Preferably, the copper busbar branch portion includes a connecting portion for connecting to a power module, and the connecting portion is provided at one end of the copper busbar branch portion away from the copper busbar main portion.

[0015] Preferably, each of the connecting parts is provided with a plurality of module connecting holes, and the module connecting holes on each of the connecting parts are distributed along a direction parallel to the copper busbar output part.

[0016] Preferably, a copper busbar output hole is provided on the copper busbar output portion.

[0017] Preferably, the paths between each of the connecting portions and the copper busbar output holes have the same length.

[0018] The beneficial effects of the present invention are as follows: due to the adoption of the above technical solution, the present invention reduces complex processes such as bending, reduces production costs, achieves good fixation with the power module through the copper busbar branch part, ensures that the copper busbar has a complete contact surface with the power module terminal during installation, and achieves consistency in the inductance from the copper busbar and the module to the output end, thereby ensuring the consistency of the output current of the power module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the current-sharing output copper busbar in an embodiment of the present utility model;

[0020] Figure 2 This is a front view of the current-sharing output copper busbar in an embodiment of the present utility model;

[0021] Figure 3 This is a schematic diagram of the current-sharing output copper bus connected to the power module in an embodiment of the present utility model.

[0022] In the attached figure: 1. Copper busbar output part; 11. Copper busbar output hole; 2. Copper busbar main part; 21. First copper busbar main part; 22. Second copper busbar main part; 3. Copper busbar branch part; 31. Connection part; 32. Module connection hole; 4. Power module. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0026] A power module parallel current output copper bus, such as Figures 1 to 3 Shown, including,

[0027] A copper busbar output portion 1, which is a bar-shaped structure;

[0028] A plurality of copper busbar main path portions 2, wherein a first end of each copper busbar main path portion 2 is connected to the copper busbar output portion 1 along the length direction of the copper busbar output portion 1;

[0029] There are multiple copper busbar branch parts 3, and the second end of each copper busbar main part 2 is connected to multiple copper busbar branch parts 3.

[0030] In a preferred embodiment, the copper busbar output portion 1, the plurality of copper busbar main portions 2 and the plurality of copper busbar branch portions 3 are arranged on the same plane.

[0031] Specifically, the present invention provides a power module parallel current equalization output copper busbar. The overall structure of the copper busbar is a planar hollow structure. One end of the copper busbar connected to the power module 4 is a plurality of independent leads. In the present invention, the power module 4 is an IGBT module.

[0032] The preferred utility model includes two copper busbar main parts 2, each copper busbar main part 2 extends along two copper busbar branch parts 3, thus including a total of four independent leads, and the other end of the copper busbar is the copper busbar output part 1, which serves as the output terminal part of the copper busbar.

[0033] The advantages of the present invention are that it reduces complex processes such as bending, reduces production costs, and the copper busbar also better fixes the parallel power modules 4. The flat design also better ensures that the fault tolerance rate is reduced during the production process, ensuring that the copper busbar has a complete contact surface with the terminals of the power module 4 during installation. The copper busbar production process is adjusted according to the measured data so that the copper busbar and the module to the output end are consistent in their inductance, thereby ensuring the current sharing consistency of the power module.

[0034] In a preferred embodiment, the copper busbar branch portion 3 and the copper busbar main portion 2 are both strip-shaped structures, the axis of the copper busbar branch portion 3 and the axis of the connected copper busbar main portion 2 have a certain angle, and the copper busbar main portion 2 and the connected copper busbar branch portion 3 form a claw-shaped structure.

[0035] Specifically, the current-averaging output copper busbar in this invention is planar, with a claw-shaped structure formed by hollowing out the portion between the copper busbar's branch sections 3. The angle between the axis of the copper busbar's branch sections 3 and the axis of the connected copper busbar's main section 2 is 60°. This claw-shaped structure reduces bending processes and achieves a uniform distance between each power module 4 and the copper busbar's output end in a planar manner. This ensures similar inductance from the copper busbar to the power module 4 terminal connection to the output side. The copper busbar's conductivity also helps evenly distribute current across the busbar, ensuring consistent output current from the power modules 4.

[0036] In a preferred embodiment, the copper busbar main path portion 2 includes a first copper busbar main path portion 21 vertically connected to the first end of the copper busbar output portion 1 and a second copper busbar main path portion 22 vertically connected to the second end of the copper busbar output portion 1.

[0037] In a preferred embodiment, the second end of each copper busbar branch portion 3 is connected to the same number of copper busbar branch portions 3 .

[0038] In a preferred embodiment, the second end of each copper busbar branch portion 3 is connected to two copper busbar branch portions 3 , and the two copper busbar branch portions 3 are symmetrically arranged.

[0039] The preferred utility model includes two copper busbar main parts 2, each copper busbar main part 2 extends along two copper busbar branch parts 3, thus including four independent leads in total, each mounting part is independently connected to a power module 4, and a total of four power modules 4 are connected. The other end of the copper busbar is the copper busbar output part 1, which serves as the output terminal part of the copper busbar.

[0040] In a preferred embodiment, the copper busbar branch portion 3 includes a connecting portion 31 for connecting to the power module 4 . The connecting portion 31 is provided at one end of the copper busbar branch portion 3 away from the copper busbar main portion 2 .

[0041] In a preferred embodiment, each connecting portion 31 is provided with a plurality of module connecting holes 32 , and the module connecting holes 32 on each connecting portion 31 are distributed along a direction parallel to the copper busbar output portion 1 .

[0042] Specifically, the size of the module connection hole 32 is adapted to the size of the screw hole for fixing the power module 4, ensuring the stability of the installation connection and reducing the tolerance. The power module 4 is connected to the connection part 31 through the module connection hole 32, and the output terminal of the power module 4 can be fitted on the plane of the copper busbar branch part 3, ensuring that the copper busbar has a complete contact surface with the output terminal of the power module 4 during installation.

[0043] In the present invention, the module connection holes 32 on each connection part 31 are distributed along a direction parallel to the copper busbar output part 1, ensuring that the power modules 4 are connected to the copper busbar in a consistent posture, so that the output copper busbar inductance is evenly distributed when the power modules 4 are connected in parallel.

[0044] In a preferred embodiment, a copper busbar output hole 11 is provided on the copper busbar output portion 1 .

[0045] Specifically, the copper busbar output hole 11 is used as the output end of the copper busbar to connect to an external device.

[0046] In a preferred embodiment, the paths between each connecting portion 31 and the copper busbar output hole 11 have the same length.

[0047] Specifically, with the claw-shaped structure formed by the copper busbar's main portion 2 and the connected copper busbar's branch portion 3, the distances between each power module 4 and the copper busbar's output end are the same, so that the stray inductance from the copper busbar's terminal connection to the power module 4 to the output side is similar. Utilizing the copper busbar's conductivity, the current is evenly distributed on the copper busbar, ensuring the consistency of the output current of the power module 4.

[0048] The above description is only a preferred embodiment of the present invention and does not limit the implementation method and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A power module parallel current sharing output copper busbar, characterized in that: include, a copper busbar output portion (1), wherein the copper busbar output portion (1) is a bar-shaped structure; A plurality of copper busbar main path portions (2), wherein a first end of each of the copper busbar main path portions (2) is connected to the copper busbar output portion (1) along the length direction of the copper busbar output portion (1); A plurality of copper busbar branch portions (3), wherein the second end of each copper busbar main portion (2) is connected to a plurality of copper busbar branch portions (3).

2. The power module parallel current sharing output copper bus according to claim 1, characterized in that: The copper busbar output portion (1), the plurality of copper busbar main path portions (2), and the plurality of copper busbar branch path portions (3) are arranged on the same plane.

3. The power module parallel current sharing output copper bus according to claim 1, characterized in that: The copper busbar branch portion (3) and the copper busbar main portion (2) are both strip-shaped structures, the axis of the copper busbar branch portion (3) and the axis of the connected copper busbar main portion (2) have a certain angle, and the copper busbar main portion (2) and the connected copper busbar branch portion (3) form a claw-shaped structure.

4. The power module parallel current-sharing output copper bus according to claim 1, characterized in that: The copper busbar main path portion (2) comprises a first copper busbar main path portion (21) vertically connected to the first end of the copper busbar output portion (1) and a second copper busbar main path portion (22) vertically connected to the second end of the copper busbar output portion (1).

5. The power module parallel current sharing output copper bus according to claim 4, characterized in that: The second end of each copper busbar branch portion (3) is connected to the same number of copper busbar branch portions (3).

6. The power module parallel current sharing output copper bus according to claim 5, characterized in that: The second end of each copper busbar branch portion (3) is connected to two copper busbar branch portions (3), and the two copper busbar branch portions (3) are symmetrically arranged.

7. The power module parallel current sharing output copper bus according to claim 1, characterized in that: The copper busbar branch portion (3) comprises a connection portion (31) for connecting to a power module (4); the connection portion (31) is provided at one end of the copper busbar branch portion (3) away from the copper busbar main portion (2).

8. The power module parallel current-sharing output copper bus according to claim 7, characterized in that: Each of the connecting parts (31) is provided with a plurality of module connecting holes (32), and the module connecting holes (32) on each of the connecting parts (31) are distributed along a direction parallel to the copper busbar output part (1).

9. The power module parallel current-sharing output copper busbar according to claim 7, characterized in that: The copper busbar output portion (1) is provided with a copper busbar output hole (11).

10. The power module parallel current-sharing output copper busbar according to claim 9, characterized in that: The paths between each of the connecting portions (31) and the copper busbar output holes (11) have the same length.

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