Welding type signal terminal structure of IGBT (Insulated Gate Bipolar Translator) module

Abstract

The utility model is applicable to the technical field of semiconductor devices, and provides an IGBT (Insulated Gate Bipolar Translator) module welding type signal terminal structure, which comprises a top part, a first bending part, a second bending part and a bottom part which are integrally formed in sequence, the top end of the first bending part is connected with the tail end of the top part, and the tail end inclines towards one side of the top part; the top end of the second bending part is connected with the tail end of the first bending part, the tail end inclines towards the other side of the bending direction of the first bending part, and the bottom of the second bending part is connected to the tail end of the second bending part; the signal terminal does not need to be fixed through a plastic piece again, the internal structure of the module is simplified, meanwhile, a certain inclination angle exists between the signal terminal and the welding face through continuous arrangement of the first bending part and the second bending part, deformation and collapse of the signal terminal can be reduced, the signal terminal has certain elastic deformation capacity, and the signal terminal is not prone to deformation. And certain pressure can be borne.

Description

Technical Field

[0001] The utility model belongs to the technical field of semiconductor devices, and in particular relates to an IGBT module welding type signal terminal structure. Background Art

[0002] IGBT packaging is composed of a heat sink, a ceramic copper-clad board (hereinafter referred to as DBC), a chip, a power terminal, a signal terminal, a shell, screws, nuts, and protective glue. The terminal ceramic copper-clad board chip and the heat sink are connected by soldering. The signal terminals currently used in China are basically of the welding type, which are fixed by inserting metal terminals into plastic parts, increasing the internal structure of the module, and the pressure bearing capacity of the upper side of the terminal is weak, which is prone to deformation. Utility Model Content

[0003] The utility model aims to overcome the above-mentioned deficiencies of the prior art and provides an IGBT module welding type signal terminal structure.

[0004] The utility model is implemented as follows: an IGBT module welding type signal terminal structure, including a top, a first bending portion, a second bending portion and a bottom which are integrally formed in sequence, the top end of the first bending portion is connected to the tail end of the top, and the tail end is inclined toward one side of the top, the top end of the second bending portion is connected to the tail end of the first bending portion, and the tail end is inclined toward the other side of the bending direction of the first bending portion, and the bottom is connected to the tail end of the second bending portion.

[0005] Furthermore, the second bending portion is provided with a cutout extending from top to bottom.

[0006] Furthermore, the top portion is vertically arranged, and the bottom portion is horizontally arranged at the tail end of the second bending portion, so that the entire signal terminal has an "L"-shaped structure.

[0007] Furthermore, the angle between the first bending portion and the top is 155°±5°, and the angle between the second bending portion and the first bending portion is 155°±5°.

[0008] Furthermore, the corner between the top and the first bending portion and the corner between the first bending portion and the second bending portion are both in the form of arc transition.

[0009] Furthermore, the bottom is provided with a U-shaped groove.

[0010] Furthermore, the top is provided with a protruding limiting structure.

[0011] Furthermore, the limiting structure includes a vertical portion and a transverse portion, the transverse portion is arranged between the top and the vertical portion, and a gap is formed between the vertical portion and the top.

[0012] The utility model provides an IGBT module welding type signal terminal structure, which does not need to be fixed again by a plastic part, thereby simplifying the internal structure of the module. At the same time, by continuously arranging the first bending portion and the second bending portion, a certain inclination angle exists between the signal terminal and the welding surface, which is beneficial to reducing the deformation and collapse of the signal terminal, so that the signal terminal has a certain elastic deformation ability and can withstand a certain pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0015] Figure 1 The utility model provides a structural schematic diagram of an IGBT module welding type signal terminal structure.

[0016] Figure 2 It is a side view of an IGBT module welding type signal terminal structure provided by the utility model.

[0017] Figure 3 It is a schematic diagram of the bending angles of the first bending portion and the second bending portion provided by the utility model.

[0018] Explanation of the accompanying drawings: 1. top; 2. first bending portion; 3. second bending portion; 4. bottom; 41. U-shaped groove; 5. incision; 6. limiting structure; 61. vertical portion; 62. horizontal portion. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0020] See also Figure 1-Figure 3, which is a welding signal terminal structure of an IGBT module disclosed in the utility model, including a top 1, a first bending portion 2, a second bending portion 3 and a bottom 4 which are integrally formed in sequence. The signal terminal structure does not require plastic parts, and is directly packaged by welding the bottom 4 above the surface DBC of the copper bottom plate. It can be welded or plug-in cold-pressed. The whole structure adopts a pure metal structure, which can be matched with silver plating, nickel plating and semi-nickel plating, and is suitable for various electroplating processes. It has high versatility. In addition, it simplifies the internal structure of the entire packaging module to a certain extent.

[0021] The top portion 1 is arranged vertically, and the bottom portion 4 is arranged horizontally at the tail end of the second bending portion 3, so that the entire signal terminal is in an "L"-shaped structure. The top end of the first bending portion 2 is connected to the tail end of the top portion 1, and the tail end is inclined toward one side of the top portion 1. The top end of the second bending portion 3 is connected to the tail end of the first bending portion 2, and the tail end is inclined toward the other side of the bending direction of the first bending portion 2. In this embodiment, the setting direction of the second bending portion 3 is consistent with the setting direction of the top portion 1, that is, it is set in a vertical direction, and the bottom portion 4 is connected to the tail end of the second bending portion 3.

[0022] The angle between the first bending portion 2 and the top portion 1 is 155°±5°. Figure 3 As shown in R1; the angle between the second bending portion 3 and the first bending portion 2 is 155°±5°. Figure 3 As shown in R2; and the corner between the top 1 and the first bending part 2 and the corner between the first bending part 2 and the second bending part 3 are both in arc transition. That is, the first bending part 2 and the second bending part 3 cooperate to make the entire signal terminal structure have two continuous large inclinations, and the arc transition is used at the corner, which is conducive to reducing the deformation and collapse of the signal terminal, so that the signal terminal has a certain elastic deformation ability, that is, improving the pressure bearing capacity above the signal terminal.

[0023] Furthermore, the second bending portion 3 is provided with a cutout 5 extending from top to bottom, and the cutout 5 preferably extends vertically from the junction of the second bending portion 3 and the first bending portion 2 toward the bottom 4. Since the first bending portion 2 is first subjected to a certain degree of pressure when the signal terminal is under pressure, the cutout 5 provides a stretching outlet for the first bending portion 2 to enhance the compressive strength of the first bending portion 2 while reducing the pressure on the second bending portion 3 and the bottom 4 behind.

[0024] Furthermore, the bottom 4 is provided with a U-shaped groove 41. During the soldering process through the bottom 4, the U-shaped groove 41 can increase the contact area between the bottom 4 and the tin, improve the welding reliability, and further stabilize the fixation between the signal terminal and the DBC. The stable connection between the signal terminal and the DBC can avoid signal interference caused by improper operation during module assembly.

[0025] Furthermore, the top 1 is provided with a protruding limiting structure 6, which limits the range of motion of the signal terminal in the subsequent module assembly process after the signal terminal and the DBC are installed, thereby reducing damage to the signal terminal by external forces. In this embodiment, the limiting structure 6 is stamped on the top 1, and the limiting structure 6 includes a vertical portion 61 and a horizontal portion 62, wherein the horizontal portion 62 is provided between the top 1 and the vertical portion 61, and a gap is formed between the vertical portion 61 and the top 1, so that the gap formed can specifically limit the movement of the signal terminal in the vertical direction.

[0026] In addition, the upper edge of the top 1 is chamfered or rounded, which is convenient for subsequent installation and assembly operations.

[0027] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An IGBT module welding type signal terminal structure, characterized in that: The invention comprises a top portion (1), a first bending portion (2), a second bending portion (3) and a bottom portion (4) which are integrally formed in sequence, wherein the top end of the first bending portion (2) is connected to the tail end of the top portion (1), and the tail end is inclined toward one side of the top portion (1); the top end of the second bending portion (3) is connected to the tail end of the first bending portion (2), and the tail end is inclined toward the other side of the bending direction of the first bending portion (2); and the bottom portion (4) is connected to the tail end of the second bending portion (3).

2. The IGBT module welding type signal terminal structure according to claim 1, characterized in that: The second bent portion (3) is provided with a cutout (5) extending from top to bottom.

3. The IGBT module welding type signal terminal structure according to claim 1, characterized in that: The top portion (1) is arranged vertically, and the bottom portion (4) is arranged horizontally at the tail end of the second bending portion (3), so that the entire signal terminal has an "L"-shaped structure.

4. The IGBT module welding type signal terminal structure according to claim 3, characterized in that: The included angle between the first bending portion (2) and the top portion (1) is 155°±5°, and the included angle between the second bending portion (3) and the first bending portion (2) is 155°±5°.

5. The IGBT module welding type signal terminal structure according to claim 1, characterized in that: The corner between the top (1) and the first bending portion (2) and the corner between the first bending portion (2) and the second bending portion (3) both have arc transitions.

6. The IGBT module welding type signal terminal structure according to claim 1, characterized in that: The bottom (4) is provided with a U-shaped groove (41).

7. The IGBT module welding type signal terminal structure according to claim 1, characterized in that: The top (1) is provided with a protruding limiting structure (6).

8. The IGBT module welding type signal terminal structure according to claim 7, characterized in that: The limiting structure (6) comprises a vertical portion (61) and a transverse portion (62); the transverse portion (62) is arranged between the top portion (1) and the vertical portion (61); and a gap is formed between the vertical portion (61) and the top portion (1).

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