Fixed terminal for current measurement of power semiconductor module

Abstract

The utility model relates to a fixed terminal for current measurement of a power semiconductor module, and belongs to the technical field of power semiconductor testing. The fixing terminal comprises a fixing terminal body, and the fixing terminal body is used for being arranged between a PCB test board and a power module to be connected and assembled. The fixing terminal body comprises a fixing end used for being fixedly connected with a PCB test board and an assembling end used for being assembled and connected with a power module, and the assembling end is of a columnar structure. One side of the fixed end extends obliquely downwards and is connected with the assembly end through a transition section; and the fixed end, the assembly end and the transition section integrally form an integrated structure. According to the utility model, one end is fixedly connected with the PCB test board and the firmness is high, the other end is assembled with the power module and is fully attached to the contact surface between the power modules, the columnar assembly end facilitates the access of a current measuring coil, the current coil can be placed in the middle and is vertical to a current path more easily, and the current measuring coil can be adapted to a high-speed current coil with a smaller diameter; and convenient and accurate current measurement is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of power semiconductor testing, in particular to a fixed terminal for current measurement of a power semiconductor module. Background Art

[0002] The current power semiconductor testing methods mainly include the following:

[0003] In the first method, a hole is opened (PCB drilling) at the copper channel location of the current path, and then a (Roche) current coil is connected perpendicular to the direction of the current. The size and position of the hole in this method are limited by the actual PCB circuit, and the placement of the coil cannot ensure that the current path remains in the center of the coil, making the coil difficult to center and place stably. The second method is to directly insert the current coil as a whole at the metal current terminal of the module, using a large-diameter current coil that can completely fit the entire shell structure where the terminal is located. Because the external structure of the rated current terminal position of the module is usually large, this method is only suitable for current coils with larger diameters, and the vertical area is narrow, which is prone to contact and difficult to install. The third method is to use conventional single or multiple nuts at the power module terminal and then rivet them together to form a columnar shape for the current coil to connect. This method is relatively convenient, but the contact surface is affected by the shape of the metal nut, preventing full contact. Furthermore, the mounting screws are tightened against the PCB on the other side, so the contact surfaces often do not align with each other. A fourth method involves designing a raised structure on the PCB with holes for screws and nuts to secure (contact) the metal terminals of the power module. This method is less expensive, but it also presents the problem of the current coil not being able to be centrally fixed. Furthermore, due to the limited space available, the current coil diameter is limited. Furthermore, the exposed copper outermost layers (top and bottom) of the PCB are susceptible to wear and deformation after repeated tightening of the module's overcurrent terminals, making contact instable and affecting service life. Furthermore, this raised structure can lead to poor insulation safety during testing. A fifth method involves using specially customized, low-height, hole-type rivet-type mounting terminals. Due to this small height, the current coil installation is also subject to space constraints. The coil's size, diameter, and thickness must all meet the required space requirements. Furthermore, during installation, the current coil can easily be jammed and squeezed, causing damage and limiting the direction of signal line extraction.

[0004] Based on the problems existing in the above-mentioned various methods, it is urgent to develop a fixed terminal for current measurement of power semiconductor modules. Utility Model Content

[0005] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides a fixed terminal for current measurement of power semiconductor modules, which can be firmly connected to the PCB test board and fully fit with the power module, thereby achieving convenient and accurate current measurement.

[0006] The technical solution adopted by the present invention is as follows: a fixed terminal for measuring current in a power semiconductor module, comprising a fixed terminal body, the fixed terminal body being arranged between a PCB test board and a power module for connection and assembly; the structure of the fixed terminal body being as follows: comprising a fixed end for fixedly connecting to the PCB test board and an assembly end for assembling with the power module; the assembly end being an overall columnar structure; extending obliquely downward on one side of the fixed end, connecting to the assembly end through a transition section; the fixed end, assembly end, and transition section forming an integrated structure.

[0007] As a further improvement of the above technical solution:

[0008] Preferably, the structure of the fixed end is as follows: comprising a fixed end bottom plate, a plurality of fixed end bases arranged in an array on the top of the fixed end bottom plate, and a protruding structure is provided on each fixed end base.

[0009] More preferably, the protruding structure is welded in a copper-clad hole of a PCB test board.

[0010] Preferably, the structure of the assembly end is as follows: comprising an assembly end top surface and an assembly end bottom surface, wherein the assembly end bottom surface is a contact surface with the power module; an assembly hole is provided in the middle of the assembly end bottom surface, and the assembly hole passes through the assembly end top surface and the assembly end bottom surface in a vertical direction;

[0011] More preferably, an assembly bolt is provided in the assembly hole, and the assembly bolt is used to connect and assemble the power module;

[0012] More preferably, the diameter of the assembly hole is in the range of 5 mm to 6 mm.

[0013] Preferably, the transition section is configured as a bridge arm structure, and the transition section is used for transition connection between the fixed end and the assembly end.

[0014] The beneficial effects of the utility model are as follows:

[0015] The utility model has a compact structure and a reasonable structural layout. The fixed terminal body structure is formed by an integrally formed fixed end, transition section and assembly end. The protrusion structure on the fixed end is welded to the copper-clad hole of the PCB test board, so that the connection between the fixed end and the PCB test board is highly secure. The assembly end of the columnar structure is connected to the power module and assembled by assembly bolts. The contact surface between the assembly end and the power module is fully fitted. The columnar assembly end facilitates the connection of the current measurement coil, making it easier to place the current coil in the center and perpendicular to the current path. It can also be adapted to high-speed current coils with smaller diameters to achieve convenient and accurate current measurement.

[0016] The utility model also has the following advantages:

[0017] (1) The fixed terminal body of the utility model forms an integral body after being welded to the PCB test board and assembled with the power module, achieving high firmness. At the same time, the compact and optimized structure maintains low impedance and parasitic inductance, minimizes the PCB area and provides more flexible assembly space. The compact shape structure reduces interference with local PCBs, shortens the design and assembly cycle of the PCB test board, and improves the installation effect.

[0018] (2) The fixed terminal of the utility model has wide applicability, and the cylindrical assembly end is compatible with a variety of PIM power modules to ensure sufficient fit;

[0019] (3) Each power module in the present invention can be connected and fixed using multiple fixed terminals. According to the conditions of different power modules and PCB test boards, the multiple fixed terminals can adopt different orientations and spatial forms to implement different power module current measurement schemes, with good flexibility and adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of the fixed terminal body of the present utility model.

[0021] Figure 2 This is a schematic diagram of the fixed state of the fixed terminal and the PCB test board in the present invention.

[0022] Figure 3 This is a schematic diagram of the assembly state of the fixed terminal and the power module in the present invention.

[0023] Figure 4 This is the overall assembly diagram of the fixed terminals, PCB test board and power module in the utility model.

[0024] Among them: 1. Fixed end; 2. Assembly end; 3. Transition section; 4. PCB test board; 5. Assembly bolts; 6. Power module;

[0025] 11. Fixed end bottom plate; 12. Fixed end base; 13. Raised structure;

[0026] 21. Top surface of the assembly end; 22. Bottom surface of the assembly end; 23. Assembly hole. DETAILED DESCRIPTION

[0027] The specific implementation of the present utility model will be described below with reference to the accompanying drawings.

[0028] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to facilitate a more thorough and comprehensive understanding of the disclosure of the present invention.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] In the case of using “including,” “having,” and “comprising” described herein, another component may be added unless a clear limiting term such as “only,” “consisting of,” etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as having one number.

[0031] It should be understood that although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element, without departing from the scope of the present invention.

[0032] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the elements in the drawings are drawn only as examples and not necessarily according to the true scale.

[0033] like Figures 1 to 4 , shows a schematic diagram of the state of a fixed terminal for current measurement of a power semiconductor module in one embodiment of the present invention; for ease of description, the accompanying drawings only show structures related to the embodiment of the present invention.

[0034] The fixed terminal for measuring current in a power semiconductor module of this embodiment includes a fixed terminal body, which is arranged between a PCB test board 4 and a power module 6 for connection and assembly. The fixed terminal body comprises a fixed end 1 for fixed connection with the PCB test board 4 and an assembly end 2 for assembly with the power module 6. The assembly end 2 is generally columnar in structure, extending obliquely downward from one side of the fixed end 1 to connect with the assembly end 2 through a transition section 3. The fixed end 1, assembly end 2, and transition section 3 form an integrated structure.

[0035] In this embodiment, the structure of the fixed end 1 is as follows: comprising a fixed end bottom plate 11, a plurality of fixed end bases 12 arranged in an array on the top of the fixed end bottom plate 11, and a protruding structure 13 provided on each fixed end base 12;

[0036] Furthermore, the protruding structure 13 is welded in the copper-clad hole of the PCB test board 4 .

[0037] In this embodiment, the assembly end 2 further comprises a structure including an assembly end top surface 21 and an assembly end bottom surface 22, wherein the assembly end bottom surface 22 is a contact surface with the power module 6; an assembly hole 23 is provided in the middle of the assembly end bottom surface 22, and the assembly hole 23 vertically penetrates the assembly end top surface 21 and the assembly end bottom surface 22;

[0038] Furthermore, an assembly bolt 5 is provided in the assembly hole 23, and the assembly bolt 5 is used to connect and assemble the power module 6;

[0039] In this embodiment, specifically, the diameter of the assembly hole 23 ranges from 5 mm to 6 mm.

[0040] In this embodiment, further, the transition section 3 is configured as a bridge arm structure, and the transition section 3 is used for transition connection between the fixed end 1 and the assembly end 2 .

[0041] In this embodiment, for example, the fixed terminal body 1 can be made of copper or brass, and the surface is processed to be smooth, which is convenient for processing and manufacturing, easy for disassembly and installation, and can meet the long-term stability of electrical characteristics after installation.

[0042] In actual work, the working method of the utility model is as follows:

[0043] The fixed end 1 of the present invention is fixedly welded to the copper-clad hole of the PCB test board 4 to ensure that the fixed end 1 and the PCB test board 4 are firmly connected. The assembly end 2 is assembled with the power module 6, wherein the assembly end bottom surface 22 of the assembly end 2 is in contact with the power module 6, and the assembly bolt 5 is assembled through the assembly hole 23 to ensure that the contact surface between the assembly end 2 and the power module 6 is fully in contact.

[0044] The utility model has a reasonable structure and is easy to assemble. The columnar assembly end 2 facilitates the access of the current measuring coil, making it easier to place the current coil in the center and perpendicular to the current path. It can also be adapted to high-speed current coils with smaller diameters to achieve convenient and accurate current measurement.

[0045] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above-described embodiments merely represent implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A fixed terminal for measuring current in a power semiconductor module, characterized in that: include: A fixed terminal body, the fixed terminal body being used to be arranged between a PCB test board (4) and a power module (6) for connection and assembly; The structure of the fixed terminal body is as follows: comprising a fixed end (1) for fixedly connecting with a PCB test board (4) and an assembly end (2) for assembling with a power module (6); The assembly end (2) is in a columnar structure as a whole; It extends obliquely downward on one side of the fixed end (1) and connects to the assembly end (2) through a transition section (3); The fixed end (1), the assembly end (2) and the transition section (3) form an integrated structure as a whole.

2. The fixed terminal for measuring current of a power semiconductor module according to claim 1, wherein: The structure of the fixed end (1) is as follows: it comprises a fixed end bottom plate (11), a plurality of fixed end bases (12) are arranged in an array on the top of the fixed end bottom plate (11), and a protruding structure (13) is provided on each fixed end base (12).

3. The fixed terminal for measuring current of a power semiconductor module according to claim 2, wherein: The protruding structure (13) is welded in the copper-clad hole of the PCB test board (4).

4. The fixed terminal for measuring current of a power semiconductor module according to claim 1, wherein: The assembly end (2) has a structure comprising an assembly end top surface (21) and an assembly end bottom surface (22), wherein the assembly end bottom surface (22) is a contact surface connected to the power module (6); An assembly hole (23) is provided in the middle of the assembly end bottom surface (22), and the assembly hole (23) vertically penetrates the assembly end top surface (21) and the assembly end bottom surface (22).

5. The fixed terminal for measuring current of a power semiconductor module according to claim 4, wherein: An assembly bolt (5) is provided in the assembly hole (23), and the assembly bolt (5) is used for connecting and assembling a power module (6).

6. The fixed terminal for measuring current of a power semiconductor module according to claim 5, wherein: The diameter of the assembly hole (23) ranges from 5 mm to 6 mm.

7. The fixed terminal for measuring current of a power semiconductor module according to claim 1, wherein: The transition section (3) is configured as a bridge arm structure, and the transition section (3) is used for transition connection between the fixed end (1) and the assembly end (2).

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