Thyristor

Abstract

The utility model relates to the field of power semiconductor devices, and discloses a thyristor, which comprises a shell, a cathode block, an anode block and a thyristor chip arranged between the cathode block and the anode block, the cathode block, the anode block and the thyristor chip are arranged in the shell, a lead group is further arranged in the shell, and the lead group is arranged in the shell. And the lead group comprises a gate lead connected with the thyristor chip and a cathode lead connected with the cathode block. Compared with the prior art, the utility model has the following advantages and effects: through the arrangement of the limiting convex part structure, when the upper shell and the lower shell are in threaded connection, the upper shell compresses the wiring terminal strip in the connecting groove, and meanwhile, the limiting convex part limits the sliding of the wiring terminal strip, and when the wiring terminal strip needs to be disassembled, the upper shell and the lower shell are driven to rotate relatively, so that the wiring terminal strip can be disassembled. Therefore, the upper shell is separated from the lower shell, the wiring terminal strip is exposed, and the wiring terminals are convenient to disassemble and assemble.

Description

Technical Field

[0001] The utility model relates to the field of power semiconductor devices, in particular to a thyristor. Background Art

[0002] Thyristor is a high-power semiconductor device developed on the basis of transistor. The emergence of thyristor has expanded semiconductor devices from the weak current field to the strong current field. The packaging forms of thyristor mainly include ceramic packaging, plastic packaging, metal shell packaging, bolt packaging and flat packaging. Among them, small and medium current thyristors are mostly packaged in ceramic, plastic and metal shell packaging, and high current thyristors are mostly packaged in bolt and flat packaging.

[0003] The patent with authorization announcement number CN210110781U discloses a flat-plate thyristor with built-in electrode leads, including a flat-plate thyristor body, the flat-plate thyristor body including an upper ring, a lower ring, a cathode block, an anode block and a thyristor chip, the cathode block is coaxially embedded in the upper ring, the anode block is coaxially embedded in the lower ring, the upper ring and the lower ring are buckled and connected so that the thyristor chip is fixed between the cathode block and the anode block. It belongs to the field of power semiconductor devices and solves the problem that the cathode lead wiring method of the existing flat-plate thyristor easily leads to the cathode lead solder joint opening.

[0004] When the above structure is used to replace the terminal block, the entire upper and lower rings need to be disassembled and separated, which may easily cause deformation or damage to the buckled upper and lower rings, resulting in connection failure. Utility Model Content

[0005] The utility model aims to provide a thyristor which has the effect of conveniently replacing the wiring terminals.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions: a thyristor, comprising a shell, a cathode block, an anode block and a thyristor chip arranged between the cathode block and the anode block, wherein the cathode block, the anode block and the thyristor chip are arranged in the shell, and a lead group is also arranged in the shell, wherein the lead group comprises a gate lead connected to the thyristor chip and a cathode lead connected to the cathode block, a wiring hole for the lead group to extend out is arranged on the shell, a wiring terminal row is connected to the outer wall of the shell, the lead group is connected to the wiring terminal row, and the gate lead and the cathode lead are connected to a trigger circuit through the wiring terminal row;

[0007] The shell includes an upper shell and a lower shell, the upper shell is threadedly connected to the lower shell, the terminal block is connected to the lower shell, a connecting groove for the terminal block to be embedded is provided on the lower shell, and a limiting protrusion is provided between the terminal block and the upper shell to limit the terminal block from sliding in the connecting groove.

[0008] By adopting the above technical solution, the terminal row is arranged in the connecting groove located on the outer wall of the shell, and the upper shell is threadedly connected to the lower shell. When the upper shell is tightened, the upper shell presses the terminal row in the connecting groove. At the same time, the limiting protrusion limits the sliding of the terminal row. When the terminal row needs to be disassembled, the upper shell and the lower shell are driven to rotate relative to each other, so that the upper shell is separated from the lower shell, the terminal row is exposed, and the disassembly and assembly of the terminal is convenient.

[0009] The utility model is further configured as follows: the limiting protrusion is fixedly connected to the bottom of the upper shell, and the terminal block and the connecting groove are provided with limiting grooves for the limiting protrusion to extend and slide into on one side close to the upper shell.

[0010] By adopting the above technical solution, when the upper shell is tightened on the lower shell, the limiting protrusion moves toward the limiting groove and extends into the limiting groove, thereby limiting the sliding of the terminal row along the limiting groove and improving the stability of the terminal row setting.

[0011] The utility model also provides another solution for setting the limiting protrusion, wherein the limiting protrusion is fixedly connected to the top of the wiring terminal row, and the bottom of the upper shell is provided with a limiting groove for the limiting protrusion to extend into and slide.

[0012] By adopting the above technical solution, when the upper shell is tightened on the lower shell, the limiting groove moves toward the limiting protrusion, the limiting protrusion extends into the limiting groove and slides relative to the limiting groove, and the limiting protrusion limits the sliding of the terminal row along the limiting groove, thereby improving the stability of the terminal row setting.

[0013] The utility model is further configured as follows: a sealing ring is provided between the wiring terminal row and the outer wall of the lower shell, and the lead group is provided in the sealing ring.

[0014] By adopting the above technical solution, the terminal block extends into the connecting groove, and a sealing ring is arranged between the terminal block and the outer wall of the lower shell to set the lead group in the sealing ring, thereby improving the sealing effect of the connection between the lead group and the terminal block, reducing the oxidation of the connection between the lead group and the terminal block, and improving the stability of the connection.

[0015] The utility model is further configured as follows: a push slope is provided on the side of the limit groove away from the port, the limit protrusion extends into the limit groove and contacts the push slope, and the terminal row slides toward the lower shell due to the interaction force between the limit protrusion and the push slope.

[0016] By adopting the above technical solution, as the limiting protrusion gradually extends into the limiting groove, the end of the limiting protrusion contacts the pushing inclined surface, thereby generating a thrust on the terminal row toward the wiring hole, thereby pushing the end of the terminal row close to the side wall of the shell, tightening the sealing ring, and further improving the sealing performance.

[0017] The utility model is further configured as follows: a sealing groove for embedding the sealing ring is provided in the connecting groove.

[0018] By adopting the above technical solution, the sealing ring is embedded in the sealing groove, thereby improving the stability of the sealing ring setting.

[0019] The utility model is further configured as follows: a positioning protrusion is fixedly connected to the inner wall of the lower shell, a positioning groove for the positioning protrusion to extend into is provided on the cathode block, and the positioning protrusion extends into the positioning groove to limit the circumferential rotation of the cathode block.

[0020] By adopting the above technical solution, the positioning protrusion extends into the positioning groove to limit the circumferential rotation of the cathode block, avoiding the cathode block from rotating when the upper shell rotates, thereby ensuring the stability of the lead group in the shell.

[0021] The utility model is further configured as follows: a connecting ring is provided at the bottom of the upper shell, a connecting groove is provided on the inner wall of the lower shell, and the connecting ring is threadedly connected to the connecting groove.

[0022] By adopting the above technical solution, the connecting ring extends into the connecting groove and is threadedly connected with the connecting groove, thereby realizing the threaded connection between the upper shell and the lower shell.

[0023] The utility model is further configured as follows: the limiting groove is provided with chamfers located on both sides of the limiting groove at one end close to the lower shell.

[0024] By adopting the above technical solution, when the limiting protrusion extends into the connecting groove, the chamfer guides the limiting protrusion, thereby improving the stability of the limiting protrusion extending into the connecting groove.

[0025] The utility model is further configured as follows: the terminal block includes a terminal body, two connecting columns fixedly connected to the terminal body, the gate lead and the cathode lead are respectively fixedly connected with connecting rings at one end away from the cathode block, the terminal body is provided with a fixing groove for the connecting ring to be embedded on the side close to the upper shell, the connecting column is inserted into one end of the terminal body and fixed to the connecting ring, and the connecting column is conductively connected to the connecting ring.

[0026] By adopting the above technical solution, when connecting the gate lead and the cathode lead to the terminal block, the connecting ring is embedded in the fixing groove, the connecting ring is set as a conductor, and the connecting ring and the connecting column are fixedly connected by the conductor screw.

[0027] The beneficial effects of the utility model are:

[0028] 1. By setting a limiting convex structure, when the upper shell and the lower shell are threadedly connected, the upper shell presses the terminal block into the connection groove, and the limiting convex part limits the sliding of the terminal block. When the terminal block needs to be disassembled, the upper shell and the lower shell are driven to rotate relative to each other, so that the upper shell is separated from the lower shell, the terminal block is exposed, and the disassembly and assembly of the terminal block is convenient;

[0029] 2. The terminal block extends into the connection groove, and the sealing ring sets the lead set in the sealing ring, thereby improving the sealing effect of the connection between the lead set and the terminal block and reducing the oxidation of the connection between the lead set and the terminal block. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a structural schematic diagram of Example 1.

[0032] Figure 2 It is a schematic diagram of the explosion of Example 1.

[0033] Figure 3 It is a schematic diagram of the cross-sectional structure of Example 1.

[0034] Figure 4 It is an enlarged schematic diagram of Example 1A.

[0035] Figure 5 It is a schematic diagram of the structure of the terminal block of Example 1.

[0036] Figure 6 This is a schematic diagram of the connection relationship of the lead group in Example 1.

[0037] Figure 7 It is a schematic diagram of the connection relationship between the limiting protrusion and the limiting groove in Example 2.

[0038] In the figure, 1, shell; 11, wiring hole; 12, upper shell; 121, connecting ring; 13, lower shell; 131, connecting groove; 132, sealing groove; 14, positioning protrusion; 2, cathode block; 21, positioning groove; 22, wire hole; 23, insulating member; 3, anode block; 4, thyristor chip; 5, lead group; 51, gate lead; 52, cathode lead; 6, terminal block; 61, terminal body; 611, fixing groove; 62, connecting column; 63, connecting ring; 64, screw; 7, limiting protrusion; 8, limiting groove; 81, chamfer; 82, push ramp; 9, sealing ring. DETAILED DESCRIPTION

[0039] The technical solution of the utility model will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] Embodiment 1, a thyristor, such as Figure 1-Figure 3 As shown, it includes a shell 1, a cathode block 2, an anode block 3 and a thyristor chip 4 arranged between the cathode block 2 and the anode block 3. The cathode block 2, the anode block 3 and the thyristor chip 4 are arranged in the shell 1. A lead group 5 is also arranged in the shell 1. The lead group 5 includes a gate lead 51 connected to the thyristor chip 4 and a cathode lead 52 connected to the cathode block 2. The shell 1 is provided with a wiring hole 11 for the lead group 5 to extend out. The outer wall of the shell 1 is connected to a terminal row 6. The lead group 5 is detachably connected to the terminal row 6. The gate lead 51 and the cathode lead 52 are connected to the trigger circuit through the terminal row 6.

[0041] like Figure 2 , Figure 3 As shown, the shell 1 includes an upper shell 12 and a lower shell 13, a connecting ring 121 is provided at the bottom of the upper shell 12, the outer wall of the connecting ring 121 is provided with an external thread, a connecting groove 131 is provided on the inner wall of the lower shell 13, the side wall of the connecting groove 131 is provided with an internal thread, the connecting ring 121 is threadedly connected to the connecting groove 131, a positioning protrusion 14 is fixedly connected to the inner wall of the lower shell 13, a positioning groove 21 for the positioning protrusion 14 to extend into is provided on the cathode block 2, and the positioning protrusion 14 extends into the positioning groove 21 to limit the circumferential rotation of the cathode block 2.

[0042] like Figure 3 , Figure 4As shown, the terminal block 6 is connected to the lower shell 13, and a connection groove 131 for the terminal block 6 to be inserted is provided on the lower shell 13, and a limiting protrusion 7 for limiting the terminal block 6 from sliding in the connection groove 131 is provided between the terminal block 6 and the upper shell 12. The limiting protrusion 7 is fixedly connected to the bottom of the upper shell 12, and the terminal block 6 and the connection groove 131 are provided with a limiting groove 8 for the limiting protrusion 7 to extend and slide on the side close to the upper shell 12, and the limiting groove 8 is provided with chamfers 81 on both sides of the limiting groove 8 on the end close to the lower shell 13. A push inclined surface 82 is provided on the side of the limiting groove 8 away from the port, and the limiting protrusion 7 extends into the limiting groove 8 and contacts the push inclined surface 82, and the terminal block 6 slides toward the lower shell 13 due to the interaction force between the limiting protrusion 7 and the push inclined surface 82.

[0043] like Figure 4 As shown, a sealing ring 9 is arranged between the terminal block 6 and the outer wall of the lower shell 13, the lead set 5 is arranged in the sealing ring 9, and a sealing groove 132 for the sealing ring 9 to be embedded is arranged in the connecting groove 131. As the limiting protrusion 7 gradually extends into the limiting groove 8, the end of the limiting protrusion 7 contacts the pushing inclined surface 82, thereby generating a thrust force on the terminal block 6 toward the wiring hole 11, thereby pushing the end of the terminal block 6 close to the side wall of the housing 1, pressing the sealing ring 9, and further improving the sealing performance.

[0044] like Figure 5 As shown, the terminal block 6 includes a terminal body 61, two connecting columns 62 fixedly connected to the terminal body 61, and connecting rings 63 are respectively welded to the ends of the gate lead 51 and the cathode lead 52 away from the cathode block 2. The connecting columns 62 and the connecting rings 63 are both configured as conductors. A fixing groove 611 for the connecting ring 63 to be embedded is provided on the side of the terminal body 61 close to the upper shell 12. The connecting columns 62 and the connecting rings 63 are fixed by screws 64 passing through the connecting columns 62 and threadedly connected with the connecting rings 63. The connecting rings 63, screws 64 and the connecting columns 62 are all configured as conductors, and the connection between the connecting columns 62 and the connecting rings 63 is achieved by connection through the screws 64.

[0045] like Figure 2 , Figure 6 As shown, a wire-passing hole 22 is provided on the cathode block 2, and the inner end of the gate lead 51 is connected to the gate of the thyristor chip 4 after passing through the wire-passing hole 22, and the inner end of the cathode lead 52 extends into the wire-passing hole 22 and is connected to the hole wall of the wire-passing hole 22. The wire-passing hole 22 is an inverted L-shaped through hole composed of a horizontal through hole and a vertical through hole. The two ends of the wire-passing hole 22 are respectively located on the bottom surface and the side wall of the cathode block 2, and the inner end of the gate lead 51 is connected to the gate of the thyristor chip 4 after passing through the horizontal through hole and the vertical through hole in sequence. An insulating member 23 is sleeved on the gate lead 51 near its inner end, and the insulating member 23 extends into the vertical through hole. The inner end of the cathode lead 52 extends into the horizontal through hole and fits tightly with the hole wall of the horizontal through hole under the extrusion of the insulating member 23.

[0046] Embodiment 2, as Figure 7 As shown, the difference from Example 1 is that the limiting protrusion 7 is fixedly connected to the top of the terminal block 6, and a limiting groove 8 for the limiting protrusion 7 to extend into and slide is provided at the bottom of the upper shell 12. When the upper shell 12 is tightened on the lower shell 13, the limiting groove 8 moves toward the limiting protrusion 7, the limiting protrusion 7 extends into the limiting groove 8 and slides relative to the limiting groove 8, and the limiting protrusion 7 limits the sliding of the terminal block 6 along the limiting groove 8, thereby improving the stability of the terminal block 6.

Claims

1. A thyristor, comprising a housing (1), a cathode block (2), an anode block (3), and a thyristor chip (4) arranged between the cathode block (2) and the anode block (3), characterized in that: The cathode block (2), the anode block (3) and the thyristor chip (4) are arranged in the shell (1); a lead group (5) is also arranged in the shell (1); the lead group (5) comprises a gate lead (51) connected to the thyristor chip (4) and a cathode lead (52) connected to the cathode block (2); a wiring hole (11) is arranged on the shell (1) for the lead group (5) to extend out; a wiring terminal block (6) is connected to the outer wall of the shell (1); the lead group (5) is connected to the wiring terminal block (6); the gate lead (51) and the cathode lead (52) are connected to the trigger circuit via the wiring terminal block (6); The housing (1) comprises an upper shell (12) and a lower shell (13); the upper shell (12) is threadedly connected to the lower shell (13); the terminal block (6) is connected to the lower shell (13); a connecting groove (131) is provided on the lower shell (13) for the terminal block (6) to be embedded; and a limiting protrusion (7) is provided between the terminal block (6) and the upper shell (12) for limiting the terminal block (6) from sliding in the connecting groove (131).

2. A thyristor according to claim 1, characterized in that: The limiting protrusion (7) is fixedly connected to the bottom of the upper shell (12), and a limiting groove (8) for the limiting protrusion (7) to extend and slide is provided on one side of the wiring terminal row (6) and the connection groove (131) close to the upper shell (12).

3. A thyristor according to claim 1, characterized in that: The limiting protrusion (7) is fixedly connected to the top of the wiring terminal block (6), and the bottom of the upper shell (12) is provided with a limiting groove (8) for the limiting protrusion (7) to extend into and slide.

4. A thyristor according to any one of claims 2-3, characterized in that: A sealing ring (9) is arranged between the wiring terminal row (6) and the outer wall of the lower shell (13), and the lead wire group (5) is arranged inside the sealing ring (9).

5. A thyristor according to claim 4, characterized in that: A push bevel (82) is provided on the side of the limiting groove (8) away from the port, the limiting protrusion (7) extends into the limiting groove (8) and contacts the push bevel (82), and the terminal block (6) slides toward the lower shell (13) due to the interaction force between the limiting protrusion (7) and the push bevel (82).

6. A thyristor according to claim 4, characterized in that: A sealing groove (132) for the sealing ring (9) to be embedded is provided in the connecting groove (131).

7. A thyristor according to claim 1, characterized in that: A positioning protrusion (14) is fixedly connected to the inner wall of the lower shell (13), and a positioning groove (21) for the positioning protrusion (14) to extend into is provided on the cathode block (2).

8. A thyristor according to claim 1, characterized in that: The bottom of the upper shell (12) is provided with a connecting ring (121), the inner wall of the lower shell (13) is provided with a connecting groove (131), and the connecting ring (121) is threadedly connected to the connecting groove (131).

9. A thyristor according to claim 3, characterized in that: An end of the limiting groove (8) close to the lower shell (13) is provided with chamfers (81) located on both sides of the limiting groove (8).

10. The thyristor according to claim 1, characterized in that: The wiring terminal block (6) comprises a terminal body (61), two connecting columns (62) fixedly connected to the terminal body (61), the gate lead (51) and the cathode lead (52) are respectively fixedly connected to a connecting ring (63) at one end away from the cathode block (2), and a fixing groove (611) for the connecting ring (63) to be embedded is provided on the side of the terminal body (61) close to the upper shell (12), and the connecting column (62) is inserted into one end of the terminal body (61) and fixed to the connecting ring (63), and the connecting column (62) is conductively connected to the connecting ring (63).

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