Busbar connection structure
By designing the busbar connection structure and fasteners, the problem of large stray inductance introduced during busbar connection is solved, resulting in smaller stray inductance and higher voltage adaptability, making it suitable for different voltage scenarios.
Patent Information
- Application Number
- CN202520250768.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-17
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-02-17
AI Technical Summary
In existing technologies, large stray inductance is easily introduced when connecting busbars.
The system adopts a busbar connection structure, which mechanically fixes the positive and negative busbars with fasteners. Two overlapping connection methods are set according to different voltage levels: the two connecting busbars are connected by fasteners at the connection points, and the positive and negative busbars are connected by fasteners at the connection points. The system also sets two overlapping connection methods according to different voltage levels to reduce stray inductance at the connection points.
By minimizing the extra loop space caused by connection points, the stray inductance of connection points is reduced, the current loop is reduced, and the stray inductance of current convergence is achieved, reducing the current loop detours and further reducing stray inductance.
Smart Images
Figure CN223713270U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to connecting busbar technical field, concretely is a busbar connecting structure. BACKGROUND
[0002] With the development of technology, the application of power semiconductor IGBT, MOSFET gradually popular. In the process of device research and development, manufacturing process and application, its switching characteristic evaluation is needed, and the evaluation method is double pulse test inductive load test. When double pulse testing, different from the inverter application scene is the measurement of the intervention of current sensor, which makes the double pulse test not easy to do as the application scene as low stray inductance electrical circuit. At present, the intervention mode of current sensor is mostly summarized in the double pulse test experience of silicon-based device. Even after years of technological development, it still faces the problem of introducing large stray inductance, and experienced engineers in the industry are still exploring to find a more suitable current measurement method.
[0003] In engineering practice, different busbars are usually needed to connect between the capacitor cell and the measured part to meet the engineering time requirement, but if each connection point cannot be specially designed, new stray inductance will be introduced, which will cause the test effect to be poor.
[0004] In the traditional busbar connection mode, the connecting side of the positive busbar and the negative busbar is provided with a connecting tab, the positive busbar and the negative busbar are connected through the connecting tab, and the connection width of the positive busbar and the negative busbar accounts for less than 20% of the total width. However, because of the existence of the connecting tab, there is a gap between the positive busbar and the negative busbar, which is the area of stray inductance, and the size of the stray inductance depends on the thickness of the connecting tab and the length of the busbar. And the current path when in use is: all positive current converges on one connecting tab, and then spreads out, at this time, the current will take a detour, increasing the stray inductance, and the negative current is the same. UTILITY MODEL CONTENTS
[0005] The technical problem to be solved by the utility model lies in: the problem of additional introduction of large stray inductance in the connection mode between the current busbars.
[0006] To solve the above technical problems, the utility model provides the following technical scheme:
[0007] A busbar connecting structure, comprising: an input positive busbar 11, an output positive busbar 12, an input negative busbar 21, an output negative busbar 22 and a fixing piece 30;
[0008] The input positive busbar 11 and the output positive busbar 12 are overlapped, the input negative busbar 21 and the output negative busbar 22 are overlapped, and the fixing piece 30 is at the positive busbar overlap and the negative busbar overlap, the positive busbar and the negative busbar are connected, and the overlap mode of the overlap is different according to the different adaptability of voltage.
[0009] In the embodiment of the utility model, the connecting place of fixed part 30, input positive busbar 11 and input negative busbar 21 are on the same side, and output positive busbar 12 and output negative busbar 22 are on the same side.
[0010] In the embodiment of the utility model, input positive busbar 11 is in the form of ascending ladder at the lap joint end, and is lapped on the upper surface of output positive busbar 12.
[0011] In the embodiment of the utility model, first insulating layer 41 is arranged between input positive busbar 11, output positive busbar 12, input negative busbar 21 and output negative busbar 22.
[0012] In the embodiment of the utility model, input negative busbar 21 is in the form of descending ladder at the lap joint end, and is lapped on the lower surface of output negative busbar 22.
[0013] In the embodiment of the utility model, second insulating layer 42 is arranged on the side surface of output positive busbar 12 relative to output negative busbar 22.
[0014] In the embodiment of the utility model, third insulating layer 43 is arranged on the side surface of input negative busbar 21 relative to input positive busbar 11.
[0015] In the embodiment of the utility model, output negative busbar 22 is in the form of descending ladder at the lap joint end, and is lapped on the lower surface of input negative busbar 21.
[0016] In the embodiment of the utility model, when in use, input positive busbar 11 and input negative busbar 21 are connected with power supply, and output positive busbar 12 and output negative busbar 22 are connected with electrical equipment.
[0017] In the embodiment of the utility model, a plurality of busbar connecting structures are arranged between power supply and electrical equipment.
[0018] Compared with the prior art, the utility model has the advantages that two connecting busbars are lapped, a plurality of busbars are mechanically fixed by fixed part, the additional loop area caused by connecting a plurality of busbars is reduced to the minimum, the additional stray inductance caused by connecting point is reduced, and two lapping modes are arranged according to different voltage levels. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 It is a busbar connecting structure schematic view of the utility model embodiment 1.
[0020] Figure 2 It is a busbar connecting structure schematic view of the utility model embodiment 2. DETAILED DESCRIPTION
[0021] For the person skilled in the art to understand the technical scheme of the utility model, the technical scheme of the utility model will be further described in conjunction with the drawings of the specification.
[0022] The terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as implying relative importance or a specific number of the technical features indicated thereby. Thus, features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.
[0023] Please refer to Figure 1 and Figure 2 The utility model provides a busbar connecting structure, including input positive busbar 11, output positive busbar 12, input negative busbar 21, output negative busbar 22 and fixing piece 30. Input positive busbar 11 and output positive busbar 12 overlap, input negative busbar 21 and output negative busbar 22 overlap, and fixing piece 30 is at the positive busbar overlap place, the negative busbar overlap place, connects the positive busbar and the negative busbar, and the overlapping mode of the overlap place is different according to the voltage of adaptation.
[0024] In the embodiment, the positive busbar overlap place refers to the overlap place of input positive busbar 11 and output positive busbar 12, and the negative busbar overlap place refers to the overlap place of input negative busbar 21 and output negative busbar 22. The positive busbar and the negative busbar are connected, which refers to connecting input positive busbar 11, output positive busbar 12, input negative busbar 21 and output negative busbar 22.
[0025] In the embodiment, the connection of fixing piece 30 is on the same side of input positive busbar 11 and input negative busbar 21, and on the same side of output positive busbar 12 and output negative busbar 22. Specifically, fixing piece 30 is, for example, a fastening screw.
[0026] Embodiment 1
[0027] Please refer to Figure 1 In the embodiment, a first insulating layer 41 is arranged between input positive busbar 11, output positive busbar 12 and input negative busbar 21, output negative busbar 22. Input positive busbar 11 is in the form of an upward stepped shape at the overlap end, and is overlapped on the upper surface of output positive busbar 12. Input negative busbar 21 is in the form of a downward stepped shape at the overlap end, and is overlapped on the lower surface of output negative busbar 22. The busbar connecting structure of embodiment 1 is that fixing piece 30 passes through input positive busbar 11, output positive busbar 12, first insulating layer 41, output negative busbar 22 and input negative busbar 21 to connect them.
[0028] Embodiment 2
[0029] Please refer toFigure 2 As shown, in one embodiment of this utility model, a second insulating layer 42 is provided on the side of the output positive busbar 12 opposite to the output negative busbar 22. A third insulating layer 43 is provided on the side of the input negative busbar 21 opposite to the input positive busbar 11. The input positive busbar 11 has an ascending stepped shape at the overlapping end, overlapping the upper surface of the output positive busbar 12. The output negative busbar 22 has a descending stepped shape at the overlapping end, overlapping the lower surface of the input negative busbar 21. The busbar connection structure of Embodiment 2 is such that the fixing member 30 passes through the input positive busbar 11, the output positive busbar 12, the second insulating layer 42, the third insulating layer 43, the input positive busbar 11, and the output negative busbar 22 to connect them.
[0030] Please see Figure 1 and Figure 2 As shown, in this embodiment, the stray inductance in the circuit system is determined by the area space between the output current and the return current, as well as the material therein. With the material remaining constant, a smaller return space area results in a smaller stray inductance. This invention minimizes the additional loop area generated by connecting two busbars, reducing the additional stray inductance caused by the connection point. Figure 1 and 2 As shown, the dashed line represents the generated stray inductance. Example 2 is more adaptable to high-voltage scenarios than Example 1. While maintaining the same creepage distance and clearance, Example 2 has a smaller stray inductance. Furthermore, while maintaining the same stray inductance, Example 2 has a larger creepage distance L2 and clearance d2, allowing it to withstand higher voltages. However, Example 1 is easier to implement than Example 2. Here, L1 represents the creepage distance of Example 1, and d1 represents the clearance of Example 1.
[0031] Please see Figure 1 and Figure 2 As shown, in use, the input positive busbar 11 and input negative busbar 21 are connected to the power supply, and the output positive busbar 12 and output negative busbar 22 are connected to the electrical equipment. Specifically, in both Embodiment 1 and Embodiment 2, the current flows from the input positive busbar 11 to the output positive busbar 12 and then reaches the electrical equipment, before flowing back to the power supply from the output negative busbar 22 to the input negative busbar 21.
[0032] In one embodiment of this invention, multiple busbar connection structures are provided between the power supply and the electrical equipment. Existing technologies sometimes result in current converging at the positive and negative terminals before dispersing. However, in embodiments 1 and 2, there are no traditional terminal structures; in other words, the terminals of this invention are the same width as the busbar itself, thus ensuring that the current does not converge and disperse, reducing unwanted inductance.
[0033] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments but can be implemented in other embodiments without deviating from the spirit or essential characteristics of the application. Therefore, the embodiments should be seen as exemplary in nature and non-limiting, the scope of the application being defined by the appended claims rather than by the above description and all changes which come within the meaning and range of equivalents of the claims are to be embraced therein. Any reference signs in the claims should not be construed as limiting the scope of the claims.
[0034] The above-described embodiments only represent some implementation manners of the present application, and the protection scope of the present application is not limited to the above-described embodiments. For those skilled in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.
Claims
1. A busbar connection structure, characterized in that, include: Input positive busbar (11), output positive busbar (12), input negative busbar (21), output negative busbar (22) and fixing component (30); The input positive busbar (11) and the output positive busbar (12) are connected, and the input negative busbar (21) and the output negative busbar (22) are connected. The fastener (30) connects the positive and negative busbars at the connection points of the positive and negative busbars, and the connection method at the connection points varies depending on the voltage level.
2. The busbar connection structure according to claim 1, characterized in that, At the connection of the fastener (30), the input positive busbar (11) and the input negative busbar (21) are on the same side, and the output positive busbar (12) and the output negative busbar (22) are on the same side.
3. The busbar connection structure according to claim 2, characterized in that, The input positive busbar (11) is in the overlapping end, and is in the shape of an ascending step. The input positive busbar (11) overlaps the upper surface of the output positive busbar (12).
4. The busbar connection structure according to claim 3, characterized in that, A first insulating layer (41) is provided between the input positive busbar (11), the output positive busbar (12) and the input negative busbar (21), the output negative busbar (22).
5. The busbar connection structure according to claim 4, characterized in that, The input negative busbar (21) is in a descending stepped shape at the overlapping end, and the input negative busbar (21) overlaps the lower surface of the output negative busbar (22).
6. The busbar connection structure according to claim 3, characterized in that, A second insulating layer (42) is provided on the side of the output positive busbar (12) opposite to the output negative busbar (22).
7. The busbar connection structure according to claim 6, characterized in that, A third insulating layer (43) is provided on the side of the input negative busbar (21) opposite to the input positive busbar (11).
8. The busbar connection structure according to claim 7, characterized in that, The output negative busbar (22) is in a descending stepped shape at the overlapping end, and the output negative busbar (22) overlaps the lower surface of the input negative busbar (21).
9. The busbar connection structure according to claim 1, characterized in that, In use, the positive input busbar (11) and the negative input busbar (21) are connected to the power supply, and the positive output busbar (12) and the negative output busbar (22) are connected to the electrical equipment.
10. The busbar according to claim 9, characterized in that, Multiple busbar connection structures are installed between the power supply and the electrical equipment.