A planar thyristor

Abstract

The utility model discloses a kind of flat plate thyristor, including shell and thyristor component;Shell side portion is equipped with the metal terminal of electrical connection with thyristor component;Shell includes lower shell and the upper cover of being closed with lower shell;Terminal jack is equipped on the side wall of lower shell;Metal terminal is inserted into terminal jack, and its upper limit part is in abutment with lower shell;Upper cover is equipped with resistance part, when upper cover is closed with lower shell, resistance part is in abutment with the end of metal terminal located in the inside of shell;Limit part and the cooperation of resistance part, jointly limit the axial movement of metal terminal along terminal jack;Flat plate thyristor structure in the utility model is reasonable, its metal terminal is installed conveniently and firmly, can effectively guarantee the use performance of flat plate thyristor, with good practicability.

Description

Technical Field

[0001] This utility model relates to the field of semiconductor device technology, and in particular to a planar thyristor. Background Technology

[0002] A planar thyristor is a high-power semiconductor switching device that employs a parallel plate-shaped electrode and a press-fit package structure. Its core structural feature is that the thyristor chip is tightly pressed between the cathode and anode electrodes, and control is achieved through the gate. This "sandwich" press-fit package gives it superior performance compared to traditional bolt-type thyristors, including higher current density, stronger short-time overload capability, and better double-sided heat dissipation. In existing designs, metal terminals are placed on the side of the housing to achieve electrical connection between external circuitry and the internal thyristor assembly. To fix the metal terminals to the housing, a plastic base is typically used as a transition structure. The metal terminals need to be fixed to the plastic base through insert injection molding or other complex assembly processes, and then the plastic base is installed as a whole assembly in the opening at the junction of the lower and upper covers. However, this structure has drawbacks: the plastic base needs to be manufactured separately, and the fixing between the metal terminals and the plastic base relies on additional injection molding or assembly processes, resulting in a complex overall structure, cumbersome manufacturing processes, and consequently, increased manufacturing costs. Utility Model Content

[0003] The purpose of this utility model is to provide a planar thyristor to solve the problems of large number of parts and high manufacturing cost caused by using plastic bases to fix metal terminals in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model provides a planar thyristor, including a housing and a thyristor assembly disposed within the housing; a metal terminal electrically connected to the thyristor assembly is mounted on the side of the housing; the housing includes a lower shell and an upper cover that mates with the lower shell; a terminal insertion hole is provided on the side wall of the lower shell; the metal terminal is inserted into the terminal insertion hole, and its upper limit portion abuts against a corresponding part of the lower shell; a stop portion is provided on the upper cover, and when the upper cover mates with the lower shell, the stop portion abuts against one end of the metal terminal located inside the housing; through the cooperation of the limiting portion and the stop portion, the axial movement of the metal terminal along the terminal insertion hole is restricted.

[0006] Preferably, a hollow insert protrudes from the outer side wall of the lower shell, and the terminal insertion hole is located inside the insert.

[0007] Preferably, the inner wall of the insert is provided with an error-proof slot or an error-proof protrusion.

[0008] Preferably, the lower shell sidewall is provided with a glue-filling port inside the insert for injecting sealant into the outer shell.

[0009] Preferably, the upper periphery of the lower shell is provided with a insertion groove, and the lower periphery of the upper cover is provided with an insertion flange that mates with the insertion groove.

[0010] Preferably, a potting gap is provided between the thyristor assembly and the inner wall of the housing.

[0011] Preferably, a plurality of positioning plates are provided on the inner wall of the housing around the thyristor assembly for positioning the thyristor assembly.

[0012] Preferably, the thyristor assembly includes a cathode block, a chip, and an anode block arranged from top to bottom. The cathode block has a mounting cavity, and a gate electrode is installed in the mounting cavity. The gate electrode is in electrical contact with the chip. The gate electrode and the cathode block are respectively connected to two metal terminals through wires. The upper cover is fitted around the outer periphery of the cathode block, and the lower shell is fitted around the outer periphery of the anode block.

[0013] Preferably, a cathode gasket is provided between the cathode block and the chip, and an anode gasket is provided between the chip and the anode block.

[0014] Preferably, the blocking part is a protruding structure integrally provided on the upper cover.

[0015] The positive effects of this utility model are as follows: This utility model optimizes the design of the planar thyristor structure. By optimizing the design of the metal terminal fixing structure, the plastic seat in the prior art is eliminated. By setting the terminal insertion hole on the lower shell, the metal terminal is directly inserted into it. Then, the limiting part of the metal terminal and the blocking part of the upper cover work together to achieve axial bidirectional limiting constraint and realize the positioning of the metal terminal. This can help reduce the number of parts and assembly steps, and reduce material and mold costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the planar thyristor in this utility model.

[0018] Figure 2 This is a side view of the planar thyristor in this utility model.

[0019] Figure 3 For along Figure 2 A sectional view cut along line AA.

[0020] Figure 4 This is a schematic diagram of the lower shell structure of this utility model.

[0021] Figure 5 This is an exploded view of the planar thyristor in this utility model.

[0022] The reference numerals in the figure are as follows: 1. Outer shell; 11. Lower shell; 111. Insert sleeve; 112. Terminal socket; 113. Anti-misalignment slot; 114. Glue inlet; 115. Insertion groove; 12. Top cover; 121. Blocking part; 122. Insertion flange; 13. Glue filling gap; 14. Positioning plate; 2. Metal terminal; 21. Limiting part; 3. Cathode block; 4. Cathode gasket; 5. Anode gasket; 6. Anode block; 7. Gate electrode; 8. Chip. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0025] The planar thyristor structure in this embodiment of the utility model is as follows: Figures 1 to 5As shown, it includes a housing 1 and a thyristor assembly disposed within the housing 1. A metal terminal 2, electrically connected to the thyristor assembly, is mounted on the side of the housing 1. The metal terminal 2 is also used for electrical connection to an external circuit, thereby realizing the electrical connection between the external circuit and the thyristor assembly. The housing 1 includes a lower shell 11 and an upper cover 12 that mates with the lower shell 11. A terminal insertion hole 112 is provided on the side wall of the lower shell 11. The metal terminal 2 is inserted into the terminal insertion hole 112, and its upper limit portion 21 abuts against a corresponding part of the lower shell 11. The upper cover 12 is provided with a stop portion 121, preferably a protruding structure integrally provided on the upper cover 12. When the upper cover 12 mates with the lower shell 11, the stop portion 121 abuts against one end of the metal terminal 2 located inside the housing 1. Through the cooperative cooperation of the limiting portion 21 and the stop portion 121, the metal terminal 2 is restricted along the axial direction of the terminal insertion hole 112 (i.e., Figure 3 Move in the left and right directions as shown.

[0026] This embodiment optimizes the design of the fixing structure of the metal terminal 2, eliminating the plastic base in the prior art. By setting a terminal insertion hole 112 on the lower shell 11, the metal terminal 2 is directly inserted into it. Then, the limiting part 21 of the metal terminal 2 and the blocking part 121 of the upper cover 12 cooperate to achieve axial bidirectional limiting constraint, thereby positioning the metal terminal 2. This can help reduce the number of parts and assembly steps, and reduce material and mold costs.

[0027] During actual assembly, the metal terminal 2 can be flexibly inserted in either the terminal socket 112 from the outside of the lower shell 11 or from the inside of the lower shell 11. When the metal terminal 2 is inserted to the predetermined position, its upper limit part 21 will abut against the corresponding inner or outer side of the lower shell 1, forming an initial inward or outward stop limit. Subsequently, the upper cover 12 is assembled with the lower shell 11, so that the abutment part 121 on the upper cover 12 abuts against the corresponding part of the metal terminal 2 inside the outer shell 1, forming a constraint in the opposite direction. Thus, through the cooperation of the limit part 21 and the abutment part 121, a bidirectional limit is formed on the metal terminal 2 in the axial direction of the terminal socket 112, ensuring that the metal terminal 2 is stably installed.

[0028] See details Figure 3 and Figure 5In this embodiment, the thyristor assembly includes a cathode block 3, a cathode pad 4, a chip 8, an anode pad 5, and an anode block 6 arranged from top to bottom. The cathode block 3 has a mounting cavity, in which a gate electrode 7 is installed. The gate electrode 7 is in electrical contact with the chip 8. The gate electrode 7 and the cathode block 3 are respectively connected to two metal terminals 2 via wires. The upper cover 12 is fitted around the cathode block 3, and the lower shell 11 is fitted around the anode block 6. The outer shell 1 formed by the lower shell 11 and the upper cover 12 together encloses and protects the thyristor assembly. In use, the plug of the external line is inserted into the outer end of the metal terminal 2 to connect the planar thyristor to the external line.

[0029] Furthermore, combined with Figure 2 and Figure 5 As shown, a hollow insert 111 protrudes from the outer wall of the lower shell 11, and the terminal socket 112 is located inside the insert 111. This structural design allows the insert 111 to shield and protect the metal terminal 2 exposed on the lower shell 11, preventing deformation of the metal terminal 2 when subjected to external pressure. Furthermore, when the external plug is inserted into the outer end of the metal terminal 2, the engagement between the insert 111 and the external plug enhances the holding force between them, ensuring long-term reliability.

[0030] See Figure 1 As shown, the inner wall of the plug tube 111 is provided with an error-proof slot 113. During the insertion of the external plug into the plug tube 111, the plug plate on the side of the external plug must be aligned with the error-proof slot 113 before it can be inserted smoothly. This ensures that the external plug can only be inserted into the terminal socket 112 in the only correct direction, thus achieving the error-proof function. As an alternative modified embodiment, an error-proof protrusion can also be provided on the inner wall of the plug tube 111 to fit the corresponding error-proof slot on the side of the external plug, achieving the same alignment error-proof function.

[0031] See Figure 1 , Figure 2 and Figure 4 As shown, the lower shell 11 has a glue-filling port 114 inside the insert 111 on its side wall. In actual production, after the outer shell 1 and the thyristor assembly are assembled, sealant is injected into the outer shell 1 through the glue-filling port 114. After the glue filling is completed, the cured sealant seals the glue-filling port 114. Since the glue-filling port 114 is located inside the insert 111, the glue-filling port 114 is hidden, thus preventing the glue-filling port 114 from being exposed on the surface of the outer shell 1 and affecting the appearance of the product.

[0032] See Figure 3The lower shell 11 has an insertion groove 115 around its upper periphery, and the upper cover 12 has an insertion flange 122 around its lower periphery that mates with the insertion groove 115. The interlocking structure of the insertion flange 122 and the insertion groove 115 forms a labyrinthine joint surface, which effectively enhances the tightness of the fit between the upper cover 12 and the lower shell 11 and can better resist external pressure; at the same time, it can also enhance the sealing of the connection between the upper cover 12 and the lower shell 11.

[0033] Continue reading Figure 3 A potting gap 13 is provided between the thyristor assembly and the inner wall of the housing 1. The sealant is injected into the potting gap 13, and the filled sealant can firmly bond the thyristor assembly and the housing 1 into a whole. This not only enhances mechanical stability, but also effectively isolates external moisture, dust and other substances to protect the thyristor assembly from influence, thereby improving the long-term working reliability of the product.

[0034] like Figures 3 to 5 As shown, multiple positioning plates 14 are arranged on the inner wall of the housing 1 around the thyristor assembly. When the thyristor assembly is installed in the housing 1, the positioning plates 14 can position the thyristor assembly to ensure that the thyristor assembly is located in a preset position inside the housing 1 and to prevent the components in the thyristor assembly from shifting.

[0035] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A planar thyristor, comprising a housing (1) and a thyristor assembly disposed within the housing (1); the housing (1) has a metal terminal (2) electrically connected to the thyristor assembly mounted on its side; the housing (1) comprises a lower shell (11) and an upper cover (12) mating with the lower shell (11); characterized in that, The lower shell (11) has a terminal socket (112) on its side wall; the metal terminal (2) is inserted into the terminal socket (112), and its upper limit part (21) abuts against the corresponding part of the lower shell (11); the upper cover (12) has a stop part (121), and when the upper cover (12) and the lower shell (11) are engaged, the stop part (121) abuts against one end of the metal terminal (2) located inside the outer shell (1); through the cooperation of the limit part (21) and the stop part (121), the metal terminal (2) is restricted from moving axially along the terminal socket (112).

2. The planar thyristor according to claim 1, characterized in that, The lower shell (11) has a hollow insert (111) protruding from its outer side wall, and the terminal socket (112) is located inside the insert (111).

3. The planar thyristor according to claim 2, characterized in that, The inner wall of the insert (111) is provided with an anti-mistake slot (113) or an anti-mistake protrusion.

4. The planar thyristor according to claim 2, characterized in that, The lower shell (11) has a glue-filling port (114) inside the insert (111) on its side wall for filling the outer shell (1) with sealant.

5. The planar thyristor according to claim 1, characterized in that, The lower shell (11) has a grooving groove (115) around its upper periphery, and the upper cover (12) has a grooving flange (122) around its lower periphery that mates with the grooving groove (115).

6. The planar thyristor according to claim 1, characterized in that, A potting gap (13) is provided between the thyristor assembly and the inner wall of the housing (1).

7. The planar thyristor according to claim 6, characterized in that, Multiple positioning plates (14) are provided on the inner wall of the outer casing (1) around the thyristor assembly for positioning the thyristor assembly.

8. The planar thyristor according to any one of claims 1 to 7, characterized in that, The thyristor assembly includes a cathode block (3), a chip (8), and an anode block (6) arranged from top to bottom. The cathode block (3) has a mounting cavity, and a gate electrode (7) is installed in the mounting cavity. The gate electrode (7) is in electrical contact with the chip (8). The gate electrode (7) and the cathode block (3) are respectively connected to two metal terminals (2) through wires. The upper cover (12) is fitted around the outer periphery of the cathode block (3), and the lower shell (11) is fitted around the outer periphery of the anode block (6).

9. The planar thyristor according to claim 8, characterized in that, A cathode gasket (4) is provided between the cathode block (3) and the chip (8), and an anode gasket (5) is provided between the chip (8) and the anode block (6).

10. The planar thyristor according to any one of claims 1 to 9, characterized in that, The blocking part (121) is a protruding structure integrally provided on the upper cover (12).

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