Current-equalizing copper bar
By designing the conductive path and recessed structure of the current-double copper row, the current inconsistency caused by uneven current in parallel use of IGBT modules is solved, extending the service life of the equipment and reducing maintenance costs.
Patent Information
- Application Number
- CN202420566091.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-22
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-03-22
AI Technical Summary
During the parallel use of IGBT modules, continuous uneven flow may easily lead to damage to the module or fuse breakage, reducing the service life of the equipment and increasing maintenance costs.
A current-sharing copper row is designed, and by setting a consistent conductive path and a recessed structure between the connection part and the current-sharing part, the current of the first and second fuses passes through the same circuit path, thereby ensuring that the current magnitude is consistent. Avoid uneven flow.
By making the current magnitude of each power module basically consistent, the service life of the equipment is extended and maintenance costs are reduced.
Smart Images
Figure CN222191367U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electrical components, in particular to a current-sharing copper busbar. Background Art
[0002] High-power inverters, including wind power converters and photovoltaic inverters, all use insulated gate bipolar transistor (IGBT) modules as key components. IGBTs are used in parallel in power modules in most cases. However, if uneven current continues to occur during the parallel use of IGBT modules, such as uneven current of the connected copper bars, it is very easy to cause damage to the IGBT in the module with large current or the fuse of the phase with large current will break first, which greatly reduces the service life of the equipment and greatly increases the maintenance cost. Utility Model Content
[0003] In view of the above problems, the utility model proposes a current-sharing copper busbar to overcome at least one drawback.
[0004] The technical solution adopted by the utility model is as follows: a current-balancing copper busbar, comprising a connecting part and a current-balancing part connected to the connecting part, the connecting part being provided with a first connecting block for connecting to a first fuse and a second connecting block for connecting to a second fuse, the current-balancing part having a first end connected to the connecting part and a second end for connecting to an external cable, a first recess being provided on one side of the current-balancing part, and a second recess being provided on the other side of the current-balancing part, and a conductive path size from the first connecting block to the second end being the same as a conductive path size from the second connecting block to the second end.
[0005] Optionally, the first connecting block is provided with a first through hole for connecting to a first fuse, the second connecting block is provided with a second through hole for connecting to a second fuse, and the conductive path size from the first through hole to the second end is the same as the conductive path size from the second through hole to the second end.
[0006] Optionally, the first connecting block and the second connecting block are symmetrically arranged along the length of the first end.
[0007] Optionally, the current balancing portion has a first side and a second side, the first through hole is close to the first side, and the second through hole is close to the second side.
[0008] Optionally, one end of the first side is connected to the first end, and the other end of the first side is bent toward the second side to form a first recess and then connected to the second end; one end of the second side is connected to the first end, and the other end of the second side is bent toward the first side to form a second recess and then connected to the second end.
[0009] Optionally, the connecting portion is vertically connected to the current equalizing portion.
[0010] Optionally, the connection between the connecting portion and the current equalizing portion is an arc-shaped connection.
[0011] Optionally, the corners around the connecting portion and the corners around the flow equalizing portion are rounded.
[0012] The beneficial effects of the utility model are as follows: the first fuse and the second fuse are arranged in parallel, the current of the first fuse flows from the first connecting block to the first end of the current balancing part, and flows to the second end through the first recess, and the current of the second fuse flows from the second connecting block to the first end of the current balancing part, and flows to the second end through the first recess, so that the distances passed by the two currents from the first end to the second end of the copper busbar are the same, and the resistance values are the same, so that the current values flowing through the copper busbar are basically the same, so that the current sizes of various power modules are basically the same, the service lives are basically the same, and the maintenance cost of the equipment is reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 A schematic diagram of the structure of the current-sharing copper busbar proposed in an embodiment of the utility model;
[0014] Figure 2 This is a schematic diagram of the connection between the current-sharing copper busbar and the first fuse and the second fuse proposed in an embodiment of the utility model.
[0015] The marks in the drawings are: 1, connecting part; 11, first connecting block; 111, first through hole; 12, second connecting block; 121, second through hole; 2, current equalizing part; 21, first end; 22, second end; 23, first side; 24, second side; 3, first recess; 4, second recess; 5, first fuse; 6, second fuse. DETAILED DESCRIPTION
[0016] The utility model is described in detail below in conjunction with the accompanying drawings.
[0017] like Figure 1 and 2As shown, a current-balancing copper busbar comprises a connecting portion 1 and a current-balancing portion 2 connected to the connecting portion 1, wherein the connecting portion 1 is provided with a first connecting block 11 for connecting to a first fuse 5 and a second connecting block 12 for connecting to a second fuse 6, the current-balancing portion 2 has a first end 21 connected to the connecting portion 1 and a second end 22 for connecting to an external cable, a first recess 3 is provided on one side of the current-balancing portion 2, and a second recess 4 is provided on the other side of the current-balancing portion 2, and a conductive path size from the first connecting block 11 to the second end 22 is the same as a conductive path size from the second connecting block 12 to the second end 22. The first fuse 5 and the second fuse 6 are arranged in parallel, and the current of the first fuse 5 flows from the first connecting block 11 to the first end 21 of the current balancing part 2, and flows to the second end 22 through the first recess 3. The current of the second fuse 6 flows from the second connecting block 12 to the first end 21 of the current balancing part 2, and flows to the second end 22 through the first recess 3, so that the distances passed by the two currents from the first end 21 to the second end 22 of the copper busbar are the same, and the resistance values are the same, so that the current values flowing through the copper busbar are basically the same, so that the current sizes of the power modules are basically the same, and the service life is basically the same, thereby reducing the maintenance cost of the equipment.
[0018] In this embodiment, if Figure 1 As shown, the first connecting block 11 is provided with a first through hole 111 for connecting to the first fuse 5, and the second connecting block 12 is provided with a second through hole 121 for connecting to the second fuse 6, and the conductive path size from the first through hole 111 to the second end 22 is the same as the conductive path size from the second through hole 121 to the second end 22.
[0019] In this embodiment, if Figure 1 As shown, the first connecting block 11 and the second connecting block 12 are symmetrically arranged along the length of the first end 21 .
[0020] In this embodiment, if Figure 1 As shown, the current balancing portion 2 has a first side 23 and a second side 24, the first through hole 111 is close to the first side 23, and the second through hole 121 is close to the second side 24. The current flows toward the second end 22 along the first side 23 and the second side 24 respectively.
[0021] In this embodiment, if Figure 1 As shown, one end of the first side 23 is connected to the first end 21, and the other end of the first side 23 is bent toward the direction of the second side 24 to form the first recess 3 and then connected to the second end 22. One end of the second side 24 is connected to the first end 21, and the other end of the second side 24 is bent toward the direction of the first side 23 to form the second recess 4 and then connected to the second end 22. The first recess 3 and the second recess 4 are arranged in opposite directions, so that the size of the conductive path from the first connection block 11 to the second end 22 is the same as the size of the wire path from the second connection block 12 to the second end 22.
[0022] In this embodiment, if Figure 1 As shown, the connection part 1 is vertically connected to the current equalizing part 2. The connection part 1 and the current equalizing part 2 are connected in an arc shape. The corners around the connection part 1 and the corners around the current equalizing part 2 are rounded. The arc connection and the rounded corners are both set to avoid tip discharge.
[0023] The above description is only a preferred embodiment of the utility model, and does not limit the patent protection scope of the utility model. Any equivalent structural transformation made using the contents of the utility model specification and drawings, directly or indirectly used in other related technical fields, is also included in the protection scope of the utility model.
Claims
1. A current-sharing copper busbar, comprising a connecting portion and a current-sharing portion connected to the connecting portion, wherein the connecting portion is provided with a first connecting block for connecting to a first fuse and a second connecting block for connecting to a second fuse, the current-sharing portion has a first end connected to the connecting portion and a second end for connecting to an external cable, and a first recess is provided on one side of the current-sharing portion, characterized in that: A second recess is provided on the other side of the current balancing portion, and the size of the conductive path from the first connecting block to the second end is the same as the size of the conductive line path from the second connecting block to the second end.
2. The current-sharing copper busbar according to claim 1, characterized in that: The first connection block is provided with a first through hole for connecting to the first fuse, the second connection block is provided with a second through hole for connecting to the second fuse, and the conductive path size from the first through hole to the second end is the same as the conductive path size from the second through hole to the second end.
3. The current-sharing copper busbar according to claim 1, characterized in that: The first connection block and the second connection block are symmetrically arranged along the length of the first end.
4. The current-sharing copper busbar according to claim 2, characterized in that: The current balancing portion has a first side and a second side, the first through hole is close to the first side, and the second through hole is close to the second side.
5. The current-sharing copper busbar according to claim 4, characterized in that: One end of the first side is connected to the first end, and the other end of the first side is bent toward the second side to form a first recess and then connected to the second end; one end of the second side is connected to the first end, and the other end of the second side is bent toward the first side to form a second recess and then connected to the second end.
6. The current-sharing copper busbar according to claim 1, characterized in that: The connecting portion is vertically connected to the current equalizing portion.
7. The current-sharing copper busbar according to claim 6, characterized in that: The connection between the connecting portion and the current equalizing portion is an arc connection.
8. The current-sharing copper busbar according to claim 1, characterized in that: The corners around the connecting portion and the corners around the flow equalizing portion are all rounded.