A connection structure between an IGBT module and a DC busbar

Abstract

The utility model relates to a connection structure of an IGBT module and a DC busbar, comprising a DC busbar, a connection module and a plurality of IGBT modules arranged in parallel, wherein the DC busbar is used for installing a capacitor, and the DC busbar comprises a P-pole busbar and an N-pole busbar; the connection module comprises a P-pole parallel copper bar, an N-pole parallel copper bar, a P-pole connecting copper bar and an N-pole connecting copper bar; J3 terminals of the IGBT modules are all connected to the P-pole parallel copper bar, and J2 terminals of the IGBT modules are all connected to the N-pole parallel copper bar; a first insulating paper is clamped between the P-pole parallel copper bar and the N-pole parallel copper bar; the P-pole connecting copper bar connects the P-pole parallel copper bar and the P-pole busbar, and the N-pole connecting copper bar connects the N-pole parallel copper bar and the N-pole busbar; the utility model adopts a stacked busbar structure design for the P-pole parallel copper bar and the N-pole parallel copper bar, and separates them with a first insulating paper to meet the requirements of a safety distance and a creepage distance, thereby effectively eliminating stray inductance and enabling the motor to work normally.

Description

Technical Field

[0001] The utility model relates to the technical field of IGBT module testing, in particular to a connection structure between an IGBT module and a DC busbar. Background Art

[0002] In recent years, power semiconductors have developed rapidly, the speed of new device updates has accelerated, and high-power power electronic inverters have been applied to all walks of life. With the market demand, high-power power electronic inverters are developing in the direction of higher switching frequency, smaller size and lower cost. The development of high-power power electronic inverters depends on the development of high-power IGBT modules. However, the greater the power of the IGBT, the greater the influence of stray capacitance and stray inductance during operation, the greater the heat generation and the higher the damage rate; the traditional IGBT power module and the DC side capacitor are connected separately, which increases the stray inductance of the IGBT module and reduces the reliability of the IGBT module.

[0003] Generally, the copper busbars between the P and N poles of the IGBI module and the P and N poles copper busbars connecting the module and the capacitor are designed in parallel. This layout scheme is prone to generate stray inductance to inhibit current flow, thereby causing the motor to fail to work. Therefore, a new connection method is designed to connect the IGBT power module and the DC busbar to reduce the stray inductance between them, which can improve the reliability of the IGBT. Utility Model Content

[0004] Based on the above description, the utility model provides a connection structure between an IGBT module and a DC busbar, which effectively eliminates stray inductance by adopting a stacked busbar structure design for the P-pole parallel copper busbar and the N-pole parallel copper busbar, and separating them with a first insulating paper in the middle to meet the requirements of safety distance and creepage distance, so as to enable the motor to work normally.

[0005] The utility model solves the above technical problems with the following technical solutions: a connection structure between an IGBT module and a DC busbar, comprising a DC busbar, a connection module and a plurality of IGBT modules arranged in parallel, wherein the DC busbar is used to install a capacitor, and the DC busbar comprises a P-pole busbar and an N-pole busbar; the connection module comprises a P-pole parallel copper bar, an N-pole parallel copper bar, a P-pole connecting copper bar and an N-pole connecting copper bar;

[0006] The P-pole parallel copper busbar includes a first parallel portion and a first stacked portion, the first parallel portion is horizontally arranged, the J3 terminals of the IGBT module are all connected to the first parallel portion, the first stacked portion is vertically arranged, and the bottom of the first stacked portion is connected to a side of the first parallel portion close to the N-pole parallel copper busbar;

[0007] The N-pole parallel copper busbar comprises a second parallel portion and a second stacked portion, the second parallel portion is horizontally arranged, the J2 terminals of the IGBT module are all connected to the second parallel portion, the second stacked portion is vertically arranged, and the bottom of the second stacked portion is connected to a side of the second parallel portion close to the P-pole parallel copper busbar;

[0008] A first insulating paper is clamped between the first stacking part and the second stacking part; the P-pole connecting copper bar is used to connect the P-pole parallel copper bar and the P-pole busbar, and the N-pole connecting copper bar is used to connect the N-pole parallel copper bar and the N-pole busbar.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, the P-pole parallel copper busbar further comprises a first connecting portion arranged horizontally, one side of the first connecting portion is connected to the top of the first stacked portion, and the first connecting portion is arranged on a side of the first stacked portion away from the second stacked portion, and one end of the P-pole connecting copper busbar is connected to the first connecting portion;

[0011] The N-pole parallel copper busbar also includes a horizontally arranged second connection portion, one side of which is connected to the top of the second stacked portion, and the second connection portion is arranged on a side of the second stacked portion away from the first stacked portion, and one end of the N-pole connection copper busbar is connected to the second connection portion.

[0012] Furthermore, both ends of the P-pole connecting copper bar and the N-pole connecting copper bar are arranged horizontally, and the N-pole connecting copper bar is stacked on top of the P-pole connecting copper bar, and a second insulating paper is clamped between the P-pole connecting copper bar and the N-pole connecting copper bar.

[0013] Furthermore, both ends of the N-pole connecting copper bar extend from both ends of the P-pole connecting copper bar.

[0014] Furthermore, the width of the P-pole connecting copper bar is greater than the width of the N-pole connecting copper bar.

[0015] Furthermore, the P-pole parallel copper busbar also includes a first lap joint, which is horizontally arranged and one side of which is connected to the top of the first stacked portion, and the first lap joint is arranged on a side of the first stacked portion away from the second stacked portion, and the first lap joint is arranged below the first connecting portion, and a plurality of first lap holes are arranged on the first lap joint, and a first rivet nut is arranged at the bottom of each of the first lap holes.

[0016] Furthermore, the first parallel part is connected to the J3 terminal of the IGBT module by bolts, and the first parallel part is provided with first bolt holes corresponding one-to-one to the J3 terminal of the IGBT module; the first overlapping part is provided with first through holes corresponding one-to-one to the first bolt holes.

[0017] Furthermore, the N-pole parallel copper busbar also includes a second overlap portion, which is horizontally arranged and one side of which is connected to the top of the second stacked portion, and the second overlap portion is arranged on a side of the second stacked portion away from the first stacked portion, and the second overlap portion is arranged below the second connecting portion, and a plurality of second overlap holes are arranged on the second overlap portion, and a second rivet nut is arranged at the bottom of each of the second overlap holes.

[0018] Furthermore, the second parallel part is connected to the J2 terminal of the IGBT module by bolts, and the second parallel part is provided with second bolt holes corresponding one-to-one to the J2 terminal of the IGBT module; the second overlapping part is provided with second through holes corresponding one-to-one to the second bolt holes.

[0019] Furthermore, the P-pole busbar and the N-pole busbar are stacked together, and a third insulating paper is clamped between the P-pole busbar and the N-pole busbar.

[0020] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0021] 1. The utility model adopts a laminated busbar structure design for the P-pole parallel copper busbar and the N-pole parallel copper busbar, and separates them with a first insulating paper in the middle to meet the requirements of safety distance and creepage distance, thereby effectively eliminating stray inductance and enabling the motor to work normally;

[0022] 2. By adopting a laminated busbar structure design for the P-pole connecting copper busbar and the N-pole connecting copper busbar, and separating them with a second insulating paper in the middle to meet the requirements of safety distance and creepage distance, the stray inductance is further eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a connection structure between an IGBT module and a DC busbar provided in an embodiment of the utility model;

[0024] Figure 2 This is an exploded schematic diagram of a DC busbar in an embodiment of the utility model;

[0025] Figure 3 It is a schematic diagram of the structure of the P-pole parallel copper bar and the N-pole parallel copper bar in the embodiment of the utility model;

[0026] Figure 4 for Figure 3 A structural diagram from another perspective;

[0027] Figure 5 This is a schematic diagram of the structure of the P-pole connecting copper bar and the N-pole connecting copper bar in the embodiment of the utility model;

[0028] Figure 6 for Figure 5 A structural diagram from another perspective;

[0029] Figure 7 This is a schematic diagram of the structure of the IGBT module in the embodiment of the utility model;

[0030] Figure 8 This is a schematic diagram of the internal circuit structure of the IGBT module in the embodiment of the utility model;

[0031] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0032] 1. DC busbar; 11. P-pole busbar; 12. N-pole busbar; 13. Third insulating paper; 2. Connection module; 21. P-pole parallel copper busbar; 211. First parallel part; 212. First stacking part; 213. First connecting part; 214. First overlapping part; 215. First bolt hole; 216. First through hole; 217. First overlapping hole; 218. First rivet nut; 22. N-pole parallel copper busbar; 221. Second parallel part; 222. Second stacking part; 223. Second connecting part; 224. Second overlapping part; 225. Second bolt hole; 226. Second through hole; 227. Second overlapping hole; 228. Second rivet nut; 23. First insulating paper; 24. P-pole connecting copper busbar; 25. N-pole connecting copper busbar; 26. Second insulating paper; 3. IGBT module. DETAILED DESCRIPTION

[0033] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0035] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0036] A connection structure between an IGBT module 3 and a DC busbar 1, such as Figure 1 As shown, it includes a DC busbar 1 , a connection module 2 and a plurality of IGBT modules 3 arranged in parallel, wherein the connection module 2 is used to connect the DC busbar 1 and the IGBT modules 3 .

[0037] DC busbar 1 is used to install capacitors, such as Figure 2 As shown, the DC busbar 1 includes a P-pole busbar 11 and an N-pole busbar 12 , which are stacked together, and a third insulating paper 13 is clamped between the P-pole busbar 11 and the N-pole busbar 12 .

[0038] like Figure 7 and Figure 8 As shown, the IGBT modules 3 are all 2-unit half-bridge IGBT modules, wherein the J1 terminal is the output interface, the J2 terminal is the lower bridge connection interface, the J3 terminal is the upper bridge connection interface, and J4 to J7 are four control interfaces respectively.

[0039] In this embodiment, the connection module 2 includes a P-pole parallel copper bar 21 , an N-pole parallel copper bar 22 , a P-pole connecting copper bar and an N-pole connecting copper bar 25 .

[0040] like Figure 3 and Figure 4 As shown, the P-pole parallel copper busbar 21 includes a first parallel portion 211, a first stacked portion 212, a first connecting portion 213 and a first overlapping portion 214. The first parallel portion 211 is arranged horizontally, and the J3 terminals of the IGBT module 3 are all connected to the first parallel portion 211. The first stacked portion 212 is arranged vertically, and the bottom of the first stacked portion 212 is connected to the side of the first parallel portion 211 close to the N-pole parallel copper busbar 22. One side of the first connecting portion 213 is connected to the top of the first stacked portion 212, and the first connecting portion 213 is arranged on the side of the first stacked portion 212 away from the second stacked portion 222. The first overlap portion 214 is horizontally arranged and one side is connected to the top of the first stacking portion 212, and the first overlap portion 214 is arranged on the side of the first stacking portion 212 away from the second stacking portion 222. The first overlap portion 214 is arranged below the first connecting portion 213. A plurality of first overlap holes 217 are arranged on the first overlap portion 214, and a first rivet nut 218 is arranged at the bottom of the first overlap hole 217 to facilitate overlap of components.

[0041] The N-pole parallel copper busbar 22 includes a second parallel portion 221, a second laminated portion 222, a second connection portion 223, and a second overlap portion 224. The second parallel portion 221 is arranged horizontally, and the J3 terminals of the IGBT module 3 are all connected to the second parallel portion 221. The second laminated portion 222 is arranged vertically, and the bottom of the second laminated portion 222 is connected to the side of the second parallel portion 221 close to the P-pole parallel copper busbar 21. One side of the second connection portion 223 is connected to the top of the second laminated portion 222, and the second connection portion 223 is arranged on the side of the second laminated portion 222 away from the first laminated portion 212. The second overlap portion 224 is horizontally arranged and one side is connected to the top of the second stack portion 222, and the second overlap portion 224 is arranged on the side of the second stack portion 222 away from the first stack portion 212, and the second overlap portion 224 is arranged below the second connecting portion 223. A plurality of second overlap holes 227 are arranged on the second overlap portion 224, and a second rivet nut 228 is arranged at the bottom of the second overlap hole 227 to facilitate overlap of components.

[0042] The first insulating paper 23 is clamped between the first stacked part 212 and the second stacked part 222, so that the P-pole parallel copper busbar 21 and the N-pole parallel copper busbar 22 adopt a stacked busbar structure design and are separated by the first insulating paper 23 to meet the requirements of safety distance and creepage distance, effectively eliminating stray inductance and enabling the motor to work normally.

[0043] In addition, the first parallel part 211 is connected to the J3 terminal of the IGBT module 3 by bolts, and the first parallel part 211 is provided with first bolt holes 215 corresponding to the J3 terminal of the IGBT module 3. The first overlap part 214 is provided with first through holes 216 corresponding to the first bolt holes 215.

[0044] The second parallel portion 221 is connected to the J2 terminal of the IGBT module 3 by bolts, and the second parallel portion 221 is provided with second bolt holes 225 corresponding to the J2 terminal of the IGBT module 3. The first overlap portion 214 is provided with second through holes 226 corresponding to the second bolt holes 225.

[0045] like Figure 5 and Figure 6 As shown, both ends of the P-pole copper bar and the N-pole copper bar 25 are arranged horizontally, and the N-pole copper bar 25 is stacked on top of the P-pole copper bar, and a second insulating paper 26 is clamped between the P-pole copper bar and the N-pole copper bar 25. The width of the P-pole copper bar is greater than the width of the N-pole copper bar 25, and both ends of the N-pole copper bar 25 extend from both ends of the P-pole copper bar. One end of the P-pole copper bar is connected to the first connecting portion 213, and the other end is connected to the P-pole busbar 11. One end of the N-pole copper bar 25 is connected to the second connecting portion 223, and the other end is connected to the N-pole busbar 12.

[0046] By also adopting a laminated busbar structure design for the P-pole connecting copper bar and the N-pole connecting copper bar 25 and separating them with a second insulating paper 26 in the middle to meet the requirements of safety distance and creepage distance, stray inductance is further eliminated.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A connection structure between an IGBT module and a DC busbar, characterized in that: It includes a DC busbar, a connection module and a plurality of IGBT modules arranged in parallel, wherein the DC busbar is used to install capacitors, and the DC busbar includes a P-pole busbar and an N-pole busbar; the connection module includes a P-pole parallel copper bar, an N-pole parallel copper bar, a P-pole connecting copper bar and an N-pole connecting copper bar; The P-pole parallel copper busbar includes a first parallel portion and a first stacked portion, the first parallel portion is horizontally arranged, the J3 terminals of the IGBT module are all connected to the first parallel portion, the first stacked portion is vertically arranged, and the bottom of the first stacked portion is connected to a side of the first parallel portion close to the N-pole parallel copper busbar; The N-pole parallel copper busbar comprises a second parallel portion and a second stacked portion, the second parallel portion is horizontally arranged, the J2 terminals of the IGBT module are all connected to the second parallel portion, the second stacked portion is vertically arranged, and the bottom of the second stacked portion is connected to a side of the second parallel portion close to the P-pole parallel copper busbar; A first insulating paper is clamped between the first stacking part and the second stacking part; the P-pole connecting copper bar is used to connect the P-pole parallel copper bar and the P-pole busbar, and the N-pole connecting copper bar is used to connect the N-pole parallel copper bar and the N-pole busbar.

2. The connection structure between an IGBT module and a DC busbar according to claim 1, characterized in that: The P-pole parallel copper busbar further comprises a first connecting portion arranged horizontally, one side of the first connecting portion is connected to the top of the first stacked portion, and the first connecting portion is arranged on a side of the first stacked portion away from the second stacked portion, and one end of the P-pole connecting copper busbar is connected to the first connecting portion; The N-pole parallel copper busbar also includes a horizontally arranged second connection portion, one side of which is connected to the top of the second stacked portion, and the second connection portion is arranged on a side of the second stacked portion away from the first stacked portion, and one end of the N-pole connection copper busbar is connected to the second connection portion.

3. The connection structure between an IGBT module and a DC busbar according to claim 2, characterized in that: Both ends of the P-pole connecting copper bar and the N-pole connecting copper bar are arranged horizontally, and the N-pole connecting copper bar is stacked on top of the P-pole connecting copper bar, and a second insulating paper is clamped between the P-pole connecting copper bar and the N-pole connecting copper bar.

4. The connection structure between an IGBT module and a DC busbar according to claim 3, characterized in that: Both ends of the N-pole connecting copper bar extend from both ends of the P-pole connecting copper bar.

5. The connection structure between an IGBT module and a DC busbar according to claim 3, characterized in that: The width of the P-pole connecting copper bar is greater than the width of the N-pole connecting copper bar.

6. The connection structure between an IGBT module and a DC busbar according to claim 2, characterized in that: The P-pole parallel copper busbar also includes a first overlapping portion, which is horizontally arranged and one side of which is connected to the top of the first stacking portion, and the first overlapping portion is arranged on a side of the first stacking portion away from the second stacking portion, and the first overlapping portion is arranged below the first connecting portion. A plurality of first overlapping holes are arranged on the first overlapping portion, and a first rivet nut is arranged at the bottom of each of the first overlapping holes.

7. The connection structure between an IGBT module and a DC busbar according to claim 6, characterized in that: The first parallel part is connected to the J3 terminal of the IGBT module by bolts, and the first parallel part is provided with first bolt holes corresponding to the J3 terminal of the IGBT module one by one; the first overlapping part is provided with first through holes corresponding to the first bolt holes one by one.

8. The connection structure between an IGBT module and a DC busbar according to claim 2, characterized in that: The N-pole parallel copper busbar also includes a second overlapping portion, which is horizontally arranged and one side of which is connected to the top of the second stacked portion, and the second overlapping portion is arranged on a side of the second stacked portion away from the first stacked portion, and the second overlapping portion is arranged below the second connecting portion, and a plurality of second overlapping holes are arranged on the second overlapping portion, and a second rivet nut is arranged at the bottom of each of the second overlapping holes.

9. The connection structure between an IGBT module and a DC busbar according to claim 8, characterized in that: The second parallel part is connected to the J2 terminal of the IGBT module by bolts, and the second parallel part is provided with second bolt holes corresponding to the J2 terminal of the IGBT module one by one; the second overlapping part is provided with second through holes corresponding to the second bolt holes one by one.

10. The connection structure between an IGBT module and a DC busbar according to claim 1, characterized in that: The P-pole busbar and the N-pole busbar are stacked together, and a third insulating paper is clamped between the P-pole busbar and the N-pole busbar.

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