Semiconductor device

Abstract

To maintain ease of insertion of an auxiliary terminal in a semiconductor device having a configuration in which an auxiliary terminal is attached to a main terminal, and to prevent the auxiliary terminal from falling off even when bending deformation occurs in the main terminal due to removal of a bus bar.SOLUTION: A semiconductor device includes a case having a terminal block, a main terminal, a bus bar, and an auxiliary terminal, and the auxiliary terminal includes a leaf spring portion that receives pressure from at least one of the terminal block and the main terminal, and a recessed and projecting structure that fits into each other is provided between the terminal block and the auxiliary terminal or between the main terminal and the auxiliary terminal.SELECTED DRAWING: Figure 5A

Description

[Technical Field]

[0001] The present disclosure relates to semiconductor devices. [Background technology]

[0002] The main terminal of the power semiconductor module is fixed with a screw while being exposed to the outside of the case. This main terminal is stacked together with the bus bar and auxiliary terminal and fixed with one screw. The other end of the auxiliary terminal is fixed together with the auxiliary wiring with another screw.

[0003] Patent Document 1 discloses an electrical device including a bus bar and a terminal block, in which the bus bar includes a main plate portion disposed on a side surface of the terminal block, a bolt fastening plate portion and a nut fastening plate portion protruding from the main plate portion, and the terminal block includes a bottom portion protruding from the side surface and a wall portion protruding from the bottom toward the bolt in the axial direction of the bolt. Patent Document 1 describes that use of the above electrical device makes it possible to easily fasten the bus bar to the terminal block, reduce the number of parts, and make the terminal block more compact. Patent Document 1 also discloses, as an example of electrical device, an electrical device including multiple semiconductor modules, a smoothing capacitor, and a control circuit board connected to the semiconductor modules.

[0004] Patent Document 2 discloses a positioning structure for a bus bar connected to a terminal portion of an electrical component, the positioning structure having a positioning portion that positions the arrangement of the bus bar in the terminal portion, the positioning portion including a contact portion that contacts an end face of the bus bar and a pair of locking portions that lock the bus bar from the side surfaces of the bus bar. Patent Document 2 describes that the above structure prevents interference between the bus bar and the electrical component when assembling the electrical device, thereby improving the ease of assembling the electrical device. Patent Document 2 also discloses a semiconductor module of a power conversion device as an example of an electrical component. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-77087 [Patent Document 2] Japanese Patent Application Publication No. 2023-114518 Summary of the Invention [Problem to be solved by the invention]

[0006] When removing the bus bar or auxiliary wiring connected to the main terminal of the power semiconductor module, there is a risk that the auxiliary terminal may fall because there is no part to support it.

[0007] The bus bar described in Patent Document 1 has a somewhat complicated shape in that it has portions disposed on both axial sides of the bolt on the surface of the terminal block, and bus bar holding portions are provided on the terminal block.

[0008] The busbar positioning structure described in Patent Document 2 is primarily intended to avoid interference between the busbar and electrical components when assembling electrical equipment, so it is unclear whether it can prevent the auxiliary terminal from falling off during the process of removing the components.

[0009] An object of the present disclosure is to maintain ease of insertion of the auxiliary terminal in a semiconductor device having a configuration in which an auxiliary terminal is attached to a main terminal, and to prevent the auxiliary terminal from falling off even if bending deformation occurs in the main terminal due to removal of a bus bar. [Means for solving the problem]

[0010] The semiconductor device of the present disclosure comprises a case having a terminal block, a main terminal, a bus bar, and an auxiliary terminal, the auxiliary terminal having a leaf spring portion that receives pressure from at least one of the terminal block and the main terminal, and a recessed and protruding structure that fits into each other is provided between the terminal block and the auxiliary terminal or between the main terminal and the auxiliary terminal. [Effects of the Invention]

[0011] According to the present disclosure, in a semiconductor device having a configuration in which an auxiliary terminal is attached to a main terminal, ease of insertion of the auxiliary terminal can be maintained, and even if bending deformation occurs in the main terminal due to removal of the bus bar, the auxiliary terminal can be prevented from falling off. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a longitudinal sectional view showing a semiconductor device according to an embodiment of the present disclosure. [Figure 2] 2 is a partially enlarged cross-sectional view showing a connection portion between a main terminal and a bus bar of the semiconductor device of FIG. 1. FIG. [Figure 3] 3 is a partially enlarged cross-sectional view showing the connection portion of FIG. 2 with the bolt and bus bar removed. [Figure 4] FIG. 3 is a top view showing the connection portion of FIG. 2. [Figure 5A] FIG. 2 is a top view showing an auxiliary terminal of the first embodiment. [Figure 5B] FIG. 2 is a side view showing the auxiliary terminal of the first embodiment. [Figure 6A] FIG. 10 is a top view showing an auxiliary terminal according to a second embodiment. [Figure 6B] FIG. 10 is a side view showing an auxiliary terminal of the second embodiment. [Figure 7] FIG. 10 is a top view showing an auxiliary terminal of a third embodiment. [Figure 8] FIG. 10 is a top view showing an auxiliary terminal of a fourth embodiment. [Figure 9A] FIG. 10 is a top view showing an auxiliary terminal of a fifth embodiment. [Figure 9B] FIG. 10 is a side view showing an auxiliary terminal of a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0014] FIG. 1 is a vertical cross-sectional view showing a semiconductor device according to an embodiment of the present disclosure.

[0015] In this figure, a power semiconductor module 1000, which is a semiconductor device, includes a case 100 that houses an electronic circuit (not shown), a base 110 on which the electronic circuit is installed, and a main terminal 2 having a portion exposed to the outside of the case 100. The base 110 is connected to a heat sink 120 that dissipates heat from the electronic circuit to the outside.

[0016] The main terminal 2 is fixed by a bolt to the upper surface of a terminal block 10 installed on top of the case 100, together with the bus bar 130 and the auxiliary terminal 3. In this figure, the bolt head 1a of the bolt is shown. The main terminal 2 is sandwiched between the bus bar 130 and the auxiliary terminal 3. The auxiliary terminal 3 is fixed by a bolt to the upper surface of the case 100, at a position away from the terminal block 10, together with the auxiliary wiring 3a.

[0017] FIG. 2 is a partially enlarged cross-sectional view showing a connection portion between a main terminal and a bus bar of the semiconductor device of FIG.

[0018] As shown in FIG. 2, one end of the auxiliary terminal 3 is sandwiched between a nut 1c and the main terminal 2, both of which are installed inside the terminal block 10. The bolt corresponding to the nut 1c is composed of a bolt head 1a and a bolt shaft 1b. The auxiliary terminal 3 has two bent portions. The auxiliary terminal 3 connects the upper surface of the case 100 and the upper surface of the terminal block 10, which are at different heights. The auxiliary terminal 3 has a through-hole 3b. A protrusion 10a is provided on the upper part of the terminal block 10. The protrusion 10a is fitted into the through-hole 3b. Although the through-hole 3b is provided in this figure, a non-through recess may be provided instead of the through-hole 3b. In this case, the recess is provided on the lower surface of the auxiliary terminal 3 so as to fit into the protrusion 10a located below.

[0019] The other end of the auxiliary terminal 3 is sandwiched between the upper surface of the case 100 and the auxiliary wiring 3a by means of a nut 201 and a bolt.

[0020] FIG. 3 is a partially enlarged cross-sectional view showing the connection portion of FIG. 2 with the bolts and bus bars removed.

[0021] In Figure 3, the bolt and bus bar 130 shown in Figure 2 have been removed. As a result, the top of the main terminal 2 is raised, making it possible to remove the auxiliary terminal 3. The protrusion 10a of the terminal block 10 is inserted into the through-hole 3b of the auxiliary terminal 3, making it difficult for the auxiliary terminal 3 to move horizontally. To remove the auxiliary terminal 3, remove the protrusion 10a from the through-hole 3b and pull out the auxiliary terminal 3 horizontally.

[0022] FIG. 4 is a top view showing the connection portion of FIG.

[0023] 4 shows a case 100, a terminal block 10, an auxiliary terminal 3, a main terminal 2, a bolt head 1a, and a bolt shaft 1b. The auxiliary terminal 3 is inserted between the main terminal 2 and the terminal block 10 in the insertion direction in the figure. [Example]

[0024] FIG. 5A is a top view showing the auxiliary terminal of the first embodiment.

[0025] The auxiliary terminal 3 shown in this figure has a main terminal connection portion 3h1 and an auxiliary wiring connection portion 3h2. The main terminal connection portion 3h1 is provided with a bolt hole 354. The auxiliary wiring connection portion 3h2 is provided with a bolt hole 355.

[0026] Leaf springs 351 functioning as elastic bodies are provided on both sides of main terminal connection portion 3h1. Slits 352 are provided between the main body of main terminal connection portion 3h1 and leaf springs 351. In addition, notches 353 are provided on both sides of main terminal connection portion 3h1. Leaf springs 351 are supported by the tip of main terminal connection portion 3h1.

[0027] FIG. 5B is a side view showing the auxiliary terminal of this embodiment.

[0028] As shown in the figure, the auxiliary terminal 3 has a main terminal connection portion 3h1, an auxiliary wiring connection portion 3h2, and a vertical portion 3v that connects the main terminal connection portion 3h1 and the auxiliary wiring connection portion 3h2.

[0029] The leaf spring portion 351 is deformed into a shape raised above the main body of the main terminal connecting portion 3h1, so that the leaf spring portion 351 functions as an elastic body against pressure from the main terminal 2 shown in FIG.

[0030] The notch 353 is designed to fit the protrusion 10a provided on the upper part of the terminal block 10 shown in Fig. 2 etc. Therefore, in the case of the auxiliary terminal 3 shown in this figure, it is desirable that the corresponding protrusions 10a be provided in two places on both sides.

[0031] According to this embodiment, when the bolt and bus bar are removed as shown in Fig. 3, the leaf spring portion 351 (Figs. 5A and 5B) deforms when the auxiliary terminal 3 is inserted between the terminal block 10 and nut 1c and the main terminal 2, facilitating the insertion of the auxiliary terminal 3. Even if the removal of the bus bar causes bending deformation (lifting) in the main terminal 2 as shown in Fig. 3, the deformation of the leaf spring portion 351 presses the auxiliary terminal 3 toward the terminal block 10, preventing the main terminal connection portion 3h1 from lifting up, and the notch portion 353 of the auxiliary terminal 3 catches on the protrusion 10a of the terminal block 10, preventing the auxiliary terminal 3 from falling off.

[0032] In addition, in the case of this embodiment, when the auxiliary terminal 3 is inserted, the leaf spring portion 351 is deformed, so that the protrusion 10a can be avoided. [Example]

[0033] Regarding this embodiment, only the differences from the first embodiment will be described.

[0034] FIG. 6A is a top view showing an auxiliary terminal of the second embodiment.

[0035] In this figure, leaf spring portions 361 are provided on both sides of main terminal connection portion 3h1. Slits 362 are provided between the main body of main terminal connection portion 3h1 and leaf spring portions 361. Leaf spring portions 361 are supported on the auxiliary wiring connection portion 3h2 side of main terminal connection portion 3h1.

[0036] Furthermore, a notch 363 is provided on the outer side of the plate spring 361. With this configuration, the arm of the plate spring 361 becomes thinner, and the plate spring 361 becomes more likely to deform.

[0037] FIG. 6B is a side view showing the auxiliary terminal of this embodiment.

[0038] In this figure, the leaf spring portion 361 is deformed into a shape that is lowered below the main body of the main terminal connection portion 3h1, thereby allowing the leaf spring portion 361 to function as an elastic body against pressure from the terminal block 10 or nut 1c shown in FIG.

[0039] In this embodiment, the same effects as in the first embodiment are achieved. [Example]

[0040] Regarding this embodiment, only the differences from the second embodiment will be described.

[0041] FIG. 7 is a top view showing an auxiliary terminal of the third embodiment.

[0042] In this figure, the tip of the leaf spring portion 371 is chamfered. Also, instead of the notch portion 353 of FIG. 6A, a through hole 373 is provided. In this case, the protrusion 10a provided on the upper part of the terminal block 10 shown in FIG. 2 etc. is arranged so as to fit into the through hole 373. Note that the through hole 373 does not necessarily have to be completely through, and may be a downward recess.

[0043] According to this embodiment, the chamfered structure of the leaf spring portion 371 makes it difficult for the corners to get caught when inserting the auxiliary terminal 3, facilitating the insertion work. [Example]

[0044] Regarding this embodiment, only the differences from the third embodiment will be described.

[0045] FIG. 8 is a top view showing an auxiliary terminal according to the fourth embodiment.

[0046] In this figure, the leaf spring portion 381 is supported at the tip of the main terminal connection portion 3h1. A slit 382 is provided between the main body of the main terminal connection portion 3h1 and the leaf spring portion 381. The width of the leaf spring portion 381 increases toward the auxiliary wiring connection portion 3h2. In other words, the leaf spring portion 381 is tapered.

[0047] According to this embodiment, the width of the tip of the main terminal connecting portion 3h1 is small, so that the corners are less likely to get caught when inserting the auxiliary terminal 3, facilitating the insertion operation. [Example]

[0048] Regarding this embodiment, only the differences from the fourth embodiment will be described.

[0049] FIG. 9A is a top view showing an auxiliary terminal of the fifth embodiment.

[0050] In this figure, the leaf spring portion 391 is supported at the tip of the main terminal connection portion 3h1. A slit 392 is provided between the main body of the main terminal connection portion 3h1 and the leaf spring portion 391. The width of the leaf spring portion 391 is uniform, and is uniform toward the auxiliary wiring connection portion 3h2.

[0051] FIG. 9B is a side view showing the auxiliary terminal of this embodiment.

[0052] In this figure, the leaf spring portion 391 is deformed into a shape lower than the main body of the main terminal connecting portion 3h1.

[0053] In the above embodiment, the configuration in which the protrusion of the terminal block and the through-hole of the auxiliary terminal are fitted together is described, but the fitting configuration according to the present disclosure is not limited to this, and the main terminal may have a through-hole, recess, or notch, and a corresponding protrusion may be provided on the main terminal connection portion of the auxiliary terminal, thereby allowing the fitting to occur. Here, the protrusion may be provided on the leaf spring portion of the main terminal connection portion.

[0054] Hereinafter, embodiments of the present disclosure will be described together.

[0055] The auxiliary terminal has a leaf spring portion that receives pressure from at least one of the terminal block and the main terminal.

[0056] Between the terminal block and the auxiliary terminal or between the main terminal and the auxiliary terminal, there is a recessed and raised structure that fits into each other. The recessed and raised structure also includes a structure that fits together with jagged surfaces that provide a large frictional force or a catch.

[0057] The uneven structure is composed of a convex portion provided on the terminal block and a concave portion provided on the auxiliary terminal, or a concave portion provided on the terminal block and a convex portion provided on the auxiliary terminal.

[0058] The terminal block, the main terminal, the bus bar, and the auxiliary terminal are stacked and fastened together by at least one bolt.

[0059] The recess provided in the auxiliary terminal is a notch or a through hole.

[0060] The auxiliary terminal has a main terminal connection portion and a bent portion, and the leaf spring portion has an arm portion supported by the tip of the main terminal connection portion and facing the bent portion. Here, the bent portion refers to the bent portion of the auxiliary terminal shown in FIG. 5B, etc. The bent portion may be formed by press working. Alternatively, the bent portion may be formed by joining two flat plates by welding, etc.

[0061] The auxiliary terminal has a main terminal connection portion, a vertical portion, and an auxiliary wiring connection portion, and a bending portion is provided between the main terminal connection portion and the vertical portion, and between the vertical portion and the auxiliary wiring connection portion, and the auxiliary terminal is arranged between the terminal block and the main terminal.

[0062] The uneven structure is constituted by a convex portion provided on the terminal block and a concave portion provided on the auxiliary terminal, and the concave portion provided on the auxiliary terminal is a notch portion or a through hole.

[0063] In the above embodiment, a power semiconductor module is described as an example of a semiconductor device, but the semiconductor device according to the present disclosure is not limited to a power semiconductor module and can be applied to other semiconductor devices, and can also be applied to electrical devices and electronic devices. [Explanation of symbols]

[0064] 1a: bolt head, 1b: bolt shaft, 1c, 201: nut, 2: main terminal, 3: auxiliary terminal, 3a: auxiliary wiring, 3b, 373: through hole, 3h1: main terminal connection portion, 3h2: auxiliary wiring connection portion, 3v: vertical portion, 10: terminal block, 10a: convex portion, 100: case, 110: base, 120: heat sink, 130: bus bar, 351: leaf spring portion, 352: slit, 353: cutout portion, 354, 355: bolt hole, 1000: power semiconductor module.

Claims

1. a case having a terminal block; The main terminal and A bus bar and an auxiliary terminal; the auxiliary terminal has a leaf spring portion that receives pressure from at least one of the terminal block and the main terminal, The semiconductor device has a recessed and protruding structure between the terminal block and the auxiliary terminal or between the main terminal and the auxiliary terminal, which are fitted together.

2. 2. The semiconductor device according to claim 1, wherein the uneven structure is composed of a convex portion provided on the terminal block and a concave portion provided on the auxiliary terminal, or a concave portion provided on the terminal block and a convex portion provided on the auxiliary terminal.

3. further comprising at least one bolt; 3. The semiconductor device according to claim 2, wherein the terminal block, the main terminal, the bus bar, and the auxiliary terminal are stacked and fastened together by the bolts.

4. The semiconductor device according to claim 2 , wherein the recess provided in the auxiliary terminal is a notch or a through hole.

5. the auxiliary terminal has a main terminal connection portion and a bent portion, 2. The semiconductor device according to claim 1, wherein said leaf spring portion has an arm portion supported by a tip end of said main terminal connection portion and directed toward said bent portion.

6. the auxiliary terminal has a main terminal connection portion, a vertical portion, and an auxiliary wiring connection portion; a bent portion is provided between the main terminal connection portion and the vertical portion, and between the vertical portion and the auxiliary wiring connection portion, 2. The semiconductor device according to claim 1, wherein the auxiliary terminal is disposed between the terminal block and the main terminal.

7. the concave-convex structure is configured by a convex portion provided on the terminal block and a concave portion provided on the auxiliary terminal, The semiconductor device according to claim 6 , wherein the recess provided in the auxiliary terminal is a notch or a through hole.

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