power module
By fixing the housing and heat dissipation base plate with a riveting structure, the problem of increased module size caused by traditional fasteners is solved, achieving the effect of reducing module size and parasitic inductance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU SILAN MICROELECTRONICS CO LTD
- Filing Date
- 2025-06-17
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional power modules increase in size by using fasteners to secure the casing and base plate, making it imperative to reduce module size.
The housing and heat dissipation base plate are fixed by a fastening structure through a riveting structure. The fastening structure, which combines interference fit and clearance fit, allows for the reuse of the same fastening structure to fix the housing and base plate, as well as the power module and external components.
The size of the power module has been reduced, the distance between the AC and DC terminals has been shortened, parasitic inductance has been reduced, and space has been saved.
Smart Images
Figure CN224503670U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of semiconductor technology, and more specifically, to a power module. Background Technology
[0002] Power modules are a new type of high-power power electronic device with advantages such as high current density, low saturation voltage and high voltage resistance. They are currently widely used in various fields such as production and daily life.
[0003] Traditional power modules are fixed to the housing and base plate with a first fastener, such as screws and sealant, and then to external components with a second fastener. The two fasteners increase the size of the power module, and there is an urgent need to reduce the size of the power module. Utility Model Content
[0004] In view of the above problems, the purpose of this utility model is to provide a power module.
[0005] This utility model provides a power module, including:
[0006] Insulating substrate;
[0007] Three half-bridge power units, namely U-phase half-bridge power unit, V-phase half-bridge power unit and W-phase half-bridge power unit, constitute a full-bridge topology circuit structure. The three half-bridge power units are located on the first surface of the insulating substrate.
[0008] The housing at least covers the insulating substrate and the three half-bridge power units around its perimeter, with the power terminals of the power modules extending from the sides of the housing;
[0009] A heat dissipation base plate is located on the second surface of an insulating substrate, with the first surface of the insulating substrate and the second surface of the insulating substrate arranged parallel to each other and facing away from each other.
[0010] The power module's casing is partially located on a heat sink base plate;
[0011] The heat sink base plate and the housing are fastened together by a fastening structure. The fastening structure includes a first part located on the housing and a second part located on the heat sink base plate. The first part is above the second part. The first part and the second part have a first through hole. The diameter of the first through hole in the first part is larger than the diameter of the first through hole in the second part, thus forming a step between the first part and the second part. A third part of the fastening structure passes through the first through hole. The third part also has a second through hole. Through the second through hole, the power module is fastened to the external components of the power module. The fastening structure also includes a fourth part, which is connected to the third part and presses on the first part.
[0012] Preferably, the third part rests on the step.
[0013] Preferably, the third and fourth parts constitute a riveted structure.
[0014] Preferably, the riveting structure and the second part are interference fit.
[0015] Preferably, the riveting structure and the first part are in a clearance fit.
[0016] Preferably, the fastening structure is located at the four corners of the power module.
[0017] Preferably, the fastening structure is also located between adjacent half-bridge power module units of the power module and is parallel to the fastening structures at the left and right corners.
[0018] Preferably, the power terminals include a DC positive terminal, a DC negative terminal, and an AC terminal for each phase power unit.
[0019] Preferably, each phase half-bridge power unit includes an upper bridge power unit and a lower bridge power unit. The first end of the upper bridge power unit is electrically connected to a DC positive terminal, the second end of the upper bridge power unit and the first end of the lower bridge power unit are electrically connected to an AC terminal, and the first end of the lower bridge power unit is electrically connected to a DC negative terminal.
[0020] Preferably, the DC positive terminal includes a first DC positive terminal and a second DC positive terminal, and the DC negative terminal is located between the first DC positive terminal and the second DC positive terminal.
[0021] Preferably, the DC negative terminal includes a first DC negative terminal and a second DC negative terminal, and the DC positive terminal is located between the first DC negative terminal and the second DC negative terminal.
[0022] Preferably, the half-bridge power unit has a potting structure.
[0023] Preferably, it also includes a magnetic core for current detection, and the encapsulation simultaneously wraps the corresponding AC terminal and the corresponding magnetic core, with the magnetic core located around the U-phase AC terminal, the V-phase AC terminal, and the W-phase AC terminal, respectively.
[0024] The fastening structure of the power module of this utility model can not only be used to fix the outer shell and the base plate, but also to fasten the power module to external components, realizing the reuse of the same fastening structure.
[0025] The fastening mechanism of this invention eliminates the need for separate fastening mechanisms for the outer casing and base plate, saving the area of the power module and shortening the distance between the AC and DC terminals. While keeping the area of each phase half-bridge power unit unchanged, the volume of the power module can be reduced. At the same time, the DC terminals are shorter, reducing the parasitic inductance of the power module. Attached Figure Description
[0026] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:
[0027] Figure 1 This is the current topology diagram of the power module of this utility model.
[0028] Figure 2 This is a front view of the power module of this utility model.
[0029] Figure 3 This is a diagram of the internal structure of the power module of this utility model.
[0030] Figure 4a This is a diagram of the fastening structure of the power module of this utility model.
[0031] Figure 4b This is an enlarged view of the fastening structure of the power module of this utility model.
[0032] Figure 4c This is an enlarged view of the fastening structure of the power module of this utility model.
[0033] Figure 5 This is a side view of the power module of this utility model. Detailed Implementation
[0034] The present invention will now be described in more detail with reference to the accompanying drawings. For clarity, the various parts in the drawings are not drawn to scale. Furthermore, certain well-known parts may not be shown. Many specific details of the present invention are described below, but as those skilled in the art will understand, the present invention may be implemented without following these specific details.
[0035] This utility model can be presented in various forms, some of which will be described below.
[0036] like Figure 2 , Figure 3 , Figure 5 As shown, this utility model provides a power module, including:
[0037] Insulating substrate 5;
[0038] The three half-bridge power units are U-phase half-bridge power unit, V-phase half-bridge power unit and W-phase half-bridge power unit respectively. The U-phase half-bridge power unit, V-phase half-bridge power unit and W-phase half-bridge power unit constitute a full-bridge topology circuit structure. The three half-bridge power units are located on the first surface of the insulating substrate 5.
[0039] Housing 1, housing 1 covers at least the insulating substrate and the three half-bridge power units around its perimeter, and the power terminals of the power modules extend from the side of the housing;
[0040] Heat dissipation base plate 9, the heat dissipation base plate is located on the second surface of insulating substrate 5, the first surface of insulating substrate and the second surface of insulating substrate are arranged in parallel and opposite directions.
[0041] The outer casing 1 of the power module is located on the heat dissipation base plate 9;
[0042] like Figure 4b , Figure 4c As shown, the heat dissipation base plate 9 and the housing 1 are fastened together by a fastening structure 2. The fastening structure includes a first part 1 located on the housing 1 and a second part 9 located on the heat dissipation base plate 9. The first part 1 is above the second part 9. The first part 1 and the second part 9 have a first through hole. The diameter of the first through hole in the first part 1 is larger than the diameter of the first through hole in the second part 9, thus forming a step between the first part and the second part. The third part 23 of the fastening structure passes through the first through hole. The third part also has a second through hole. Through the second through hole, the power module is fastened to the external components of the power module. The fastening structure also includes a fourth part 24, which is connected to the third part 23. The fourth part 24 presses on the first part 1.
[0043] like Figures 4a to 4c As shown, the third part 23 presses on the step; the third part 23 and the fourth part 24 form a riveted structure.
[0044] like Figure 4c As shown in the circled 2T section, the riveting structure is an interference fit with the second section.
[0045] like Figure 4b , Figure 4c As shown, the riveting structure has a clearance fit with the first part 1.
[0046] like Figure 4a As shown, the fastening structure 2 is located at the four corners of the power module. The fastening structure 2 is also located between adjacent half-bridge power module units of the power module and is parallel to the fastening structures 2 at the left and right corners. The power module of this utility model schematically includes 8 fastening structures 2a to 2h.
[0047] like Figure 2 As shown, the power terminals include DC positive terminals 4a, 4c, 5a, 5c, 6a, 6c and DC negative terminals 4b, 5b, 6b and AC terminals 7a, 7b, 7c for each phase power unit.
[0048] like Figure 1As shown, each phase half-bridge power unit includes an upper bridge power unit and a lower bridge power unit. The first end of the upper bridge power unit is electrically connected to the DC positive terminal DC+, the second end of the upper bridge power unit and the first end of the lower bridge power unit are electrically connected to the AC terminal, and the first end of the lower bridge power unit is electrically connected to the DC negative terminal DC-.
[0049] like Figure 2 As shown, the DC positive terminals include first DC positive terminals 4a, 5a, 6a and second DC positive terminals 4c, 5c, 6c, and DC negative terminals 4b, 5b, 6b are located between the first DC positive terminals 4a, 5a, 6a and the second DC positive terminals 4c, 5c, 6c.
[0050] Furthermore, the positions of the DC positive terminal and the DC negative terminal can be interchanged, that is, the DC negative terminal includes the first DC negative terminal 4a, 5a, 6a and the second DC negative terminal 4c, 5c, 6c, and the DC positive terminal 4b, 5b, 6b is located between the first DC negative terminal 4a, 5a, 6a and the second DC negative terminal 4c, 5c, 6c.
[0051] like Figures 2 to 5 As shown, the half-bridge power unit has a potting structure.
[0052] like Figure 2 As shown, the power module also includes magnetic cores 8a, 8b, and 8c for current detection. The plastic encapsulation simultaneously encapsulates the corresponding AC terminals 7a, 7b, and 7c and the corresponding magnetic cores 8a, 8b, and 8c. The magnetic cores 8a, 8b, and 8c are located around the U-phase AC terminal 7a, the V-phase AC terminal 7b, and the W-phase AC terminal 7c, respectively.
[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0054] As described above, these embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Clearly, many modifications and variations can be made based on the above description. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to make good use of the present invention and its modifications. The present invention is limited only by the claims and their full scope and equivalents.
Claims
1. A power module, characterized in that, include: Insulating substrate; Three half-bridge power units, namely U-phase half-bridge power unit, V-phase half-bridge power unit and W-phase half-bridge power unit, constitute a full-bridge topology circuit structure, and the three half-bridge power units are located on the first surface of the insulating substrate. The housing at least covers the insulating substrate and the three half-bridge power units around its perimeter, with the power terminals of the power modules extending from the sides of the housing; A heat dissipation base plate is located on the second surface of the insulating substrate, and the first surface and the second surface of the insulating substrate are arranged parallel to each other and facing away from each other. The power module's surrounding housing is located on the heat dissipation base plate; The heat dissipation base plate and the housing are fastened together by a fastening structure. The fastening structure includes a first part located on the housing and a second part located on the heat dissipation base plate. The first part is above the second part. The first part and the second part have a first through hole. The diameter of the first through hole in the first part is larger than the diameter of the first through hole in the second part, thus forming a step between the first part and the second part. A third part of the fastening structure passes through the first through hole. The third part also has a second through hole. Through the second through hole, the power module is fastened to external components of the power module. The fastening structure also includes a fourth part, which is connected to the third part and presses against the first part.
2. The power module according to claim 1, characterized in that, The third part rests on the step.
3. The power module according to claim 1, characterized in that, The third and fourth parts constitute a riveting structure.
4. The power module according to claim 3, characterized in that, The riveting structure is an interference fit with the second part.
5. The power module according to claim 4, characterized in that, The riveting structure has a clearance fit with the first part.
6. The power module according to claim 1, characterized in that, The fastening structure is located at the four corners of the power module.
7. The power module according to claim 6, characterized in that, The fastening structure is also located between adjacent half-bridge power module units of the power module and is parallel to the fastening structures at the left and right corners.
8. The power module according to claim 1, characterized in that, The power terminals include a DC positive terminal, a DC negative terminal, and an AC terminal for each phase power unit.
9. The power module according to claim 8, characterized in that, Each phase half-bridge power unit includes an upper bridge power unit and a lower bridge power unit. The first end of the upper bridge power unit is electrically connected to the DC positive terminal, the second end of the upper bridge power unit and the first end of the lower bridge power unit are electrically connected to the AC terminal, and the first end of the lower bridge power unit is electrically connected to the DC negative terminal.
10. The power module according to claim 8, characterized in that, The DC positive terminal includes a first DC positive terminal and a second DC positive terminal, and the DC negative terminal is located between the first DC positive terminal and the second DC positive terminal.
11. The power module according to claim 8, characterized in that, The DC negative terminal includes a first DC negative terminal and a second DC negative terminal, and the DC positive terminal is located between the first DC negative terminal and the second DC negative terminal.
12. The power module according to claim 1, characterized in that, The half-bridge power unit is a potted structure.
13. The power module according to claim 1, characterized in that, It also includes a magnetic core for current detection. The encapsulation simultaneously wraps the corresponding AC terminal and the corresponding magnetic core, with the magnetic core located around the U-phase AC terminal, the V-phase AC terminal, and the W-phase AC terminal, respectively.