An earthquake-resistant flat plate type thyristor

Abstract

The utility model discloses an anti -seismic flat plate type thyristor, including apron, ceramic shell and base. The recess is set up in the middle part of apron and base, and the heat conduction silica gel block that is slightly higher than the surface is arranged in the groove. The fixed shell is equipped with the ceramic shell periphery, and the outside convex part of it is penetrated with two locking channels, is respectively worn with first fixed column and second fixed column, and is locked through the outside fastening bolt. The structure effectively buffers vibration and impact through the pre -compression heat conduction silica gel block, and provides the even stable clamping force through the peripheral locking mechanism simultaneously, and the anti -seismic performance and heat dissipation reliability of thyristor under high speed or vibration working condition are improved obviously.

Description

Technical Field

[0001] This utility model relates to the field of high-power semiconductor device technology, specifically to an anti-vibration flat-plate thyristor for use in high-vibration, high-reliability operating conditions. Background Technology

[0002] A thyristor is a high-power switching semiconductor device. Its function extends beyond rectification; it can also be used as a contactless switch to quickly connect or disconnect circuits, invert DC to AC, and convert AC of one frequency to another, among other applications. Thyristors offer advantages such as small size, high efficiency, good stability, and reliable operation. Their emergence has propelled semiconductor technology from the low-voltage to the high-voltage domain, making them a widely adopted component in industry, agriculture, transportation, military research, and even commercial and consumer electronics. Thyristors are typically packaged in planar form using heat sinks on both sides, axially pressed together with multiple bolts, or secured by external clamping force.

[0003] In existing technologies, under long-term mechanical vibration or impact conditions, the bolt connections of planar thyristors are prone to loosening or even loosening of the preload, leading to two serious consequences: First, the contact pressure between the thyristor and the heat sink decreases, the interface thermal resistance increases sharply, and effective heat dissipation cannot be achieved, causing the chip junction temperature to rise, which seriously affects the reliability and lifespan of the device; Second, after the connection becomes loose, the relative displacement or non-parallelism between the thyristor and the heat sink may occur, and they may collide and rub against each other under vibration excitation, which can easily cause the brittle ceramic shell of the thyristor to crack or the chip to be damaged, resulting in equipment failure. Utility Model Content

[0004] The purpose of this invention is to provide a shock-resistant flat plate thyristor to solve the problems mentioned in the background art.

[0005] The technical solution of this utility model is: a shock-resistant flat plate thyristor, comprising a flat plate thyristor body and an external structure. The flat plate thyristor includes a cover plate, a ceramic shell, and a base. The cover plate and the base are arranged parallel to each other. The ceramic shell is fixedly disposed between the cover plate and the base. An external wire extends from the outer side of the ceramic shell. The external structure includes a fixed shell, which is sleeved around the ceramic shell. The outer side of the fixed shell has a protrusion. Two locking channels are opened through the protrusion. A first fixing post and a second fixing post are respectively inserted into the two locking channels. One end of the first fixing post and the second fixing post are respectively fixedly connected to heat sinks on both sides and locked by fastening bolts provided on the outer side of the protrusion, so that the fixed shell applies a radial clamping force pointing towards the center of the device to the ceramic shell. Grooves are opened on the outer mounting planes of the cover plate and the base, and elastic thermally conductive silicone blocks are fixedly disposed on the bottom surface of the grooves. The thermally conductive silicone blocks protrude from the grooves in their natural state.

[0006] Preferably, the groove is a cylindrical cavity; the thermally conductive silicone block is cylindrical in shape, with its bottom surface shape and size being the same as the bottom surface of the groove, and its top surface shape being smaller than its bottom surface.

[0007] Preferably, a pressure detection plate is fixedly provided between the bottom surface of the thermally conductive silicone block and the bottom surface of the groove.

[0008] Preferably, the first and second fixing posts are screws, which are fixedly connected to the heat sinks on both sides by nuts.

[0009] Preferably, the fastening bolt is a hexagonal socket head cap screw with its flat end abutting against the surface of the first or second fixing post.

[0010] Preferably, the height of the thermally conductive silicone block protruding from the groove in its natural state is 5mm to 8mm.

[0011] This utility model provides an improved, shock-resistant flat-plate thyristor, which has the following improvements and advantages compared with the prior art: Firstly, this invention utilizes the radial clamping force provided by the fixed outer shell and fastening bolts to tightly bind the thyristor body like a "clamp," preventing it from loosening under vibration. This ensures that the clamping pressure between the thyristor and the heat sinks on both sides remains stable and uniform. The thermally conductive silicone block, acting as a pre-compression buffer and filling medium, undergoes elastic deformation when squeezed by the heat sink, consistently filling the microscopic gaps between the thyristor mounting surface and the heat sink surface. Even under high-frequency vibration and minute displacement, the elasticity of the silicone block continuously compensates, maintaining tight contact. These two factors combined ensure that the thermal interface between the thyristor and the heat sink maintains a low thermal resistance, allowing heat to be efficiently conducted from the chip to the heat sink. This avoids junction temperature rise due to poor contact, thereby significantly improving the long-term operational reliability and service life of the device.

[0012] Secondly, the radial clamping force of this invention firmly locks the thyristor in the fixed housing, significantly suppressing macroscopic relative displacement or non-parallelism between the thyristor body and the heat sink, thus fundamentally preventing damage caused by collision and friction. The elastomeric properties of the thermally conductive silicone block make it an excellent vibration damper and buffer. It can absorb and attenuate vibration energy and mechanical shock from the heat sink or external environment, preventing these stresses from being directly transmitted to the brittle ceramic housing and the internal chip. This combination of "rigid fixing (housing) + flexible buffer (silicone)" provides double protection for the thyristor, enabling it to withstand harsh vibration environments, greatly reducing the risk of ceramic housing breakage and damage to internal chip bonding points, and reducing equipment failure rate. Attached Figure Description

[0013] The present invention will be further explained below with reference to the accompanying drawings and embodiments: Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is an exploded view of this utility model; Figure 3 This is an exploded view of this utility model.

[0014] Explanation of reference numerals in the attached figures: 1. Flat thyristor; 11. Cover plate; 12. Ceramic housing; 13. Base; 14. Groove; 2. Thermally conductive silicone block; 3. Fixed housing; 31. Protrusion; 32. Locking channel; 33. Fastening bolt; 4. First fixing post; 5. Second fixing post; 6. External wiring Detailed Implementation

[0015] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0016] This utility model provides an improved, shock-resistant flat-plate thyristor. The technical solution of this utility model is as follows: like Figures 1-3 As shown, the flat-plate thyristor 1 is placed inside the fixed housing 3, with its ceramic housing 12 located within the internal cavity of the fixed housing 3. The first fixing post 4 and the second fixing post 5, which pass through the locking channel 32 via the outer protrusion 31 of the fixed housing 3, are each fixedly connected to the heat sinks on both sides at their respective ends. The top planes of the thermally conductive silicone blocks 2 on the cover plate 11 and base 13 of the flat-plate thyristor 1 are aligned with the corresponding heat sink planes. The heat sinks on both sides are tightened towards the center, and then the first fixing post 4 and the second fixing post 5 are respectively secured within the locking channel 32 using fastening bolts 33. At this time, the thermally conductive silicone blocks 2 undergo elastic deformation, filling the microscopic gaps between the mounting surface of the flat-plate thyristor 1 and the surface of the heat sink.

[0017] Furthermore, the groove 14 is directly machined or milled into a cylindrical cavity during processing. The thermally conductive silicone block 2 is injection molded or cut into a near-cylindrical shape, and its bottom is fixed to the bottom surface of the groove 14 by adhesive or other means. Its top surface is designed as a slightly smaller circle or the same circle but with a slightly smaller diameter, forming a structure similar to a "boob". This shape is conducive to uniform expansion and filling in all directions when under pressure, while avoiding stress concentration at the edges.

[0018] Furthermore, a thin-film pressure sensor is attached to the bottom surface of the groove 14. The wires of this pressure sensor can be led out through a small hole and connected to external monitoring equipment. During installation and tightening, or during operation and maintenance, the actual clamping force of the radiator on the thyristor can be monitored in real time, ensuring that the pressure value is always within the reasonable range required by the design, thus achieving quantitative control and early warning of the clamping force.

[0019] Furthermore, the first fixing post 4 and the second fixing post 5 are directly selected from standard screws. After the screw passes through the locking channel 32 of the radiator and the protrusion 31, nuts are screwed on both ends of the screw and tightened to achieve a rigid connection between the radiator and the fixed housing 3. This method has a simple structure and is convenient to purchase and install.

[0020] Furthermore, a standard hex socket head cap set screw is selected as the fastening bolt 33. When tightened, its flat end directly presses against the cylindrical surface of the first fixing post 4 or the second fixing post 5. The contact between the flat surface and the cylindrical surface is a line contact, with huge pressure, which can generate a great frictional force, effectively preventing the fixing post from moving in any direction, and the locking effect is very reliable.

[0021] Furthermore, when manufacturing the thermally conductive silicone block 2, its height in its free state (when not under pressure) is set to be 5mm to 8mm greater than the depth of the groove 14. This pre-protrusion ensures that the silicone block can be fully compressed after final installation (typically 20%-50% compression is preferred), generating sufficient elastic restoring force to guarantee contact pressure, while allowing sufficient buffer stroke to absorb vibration.

[0022] Working principle: The fixed outer shell 3 serves as the main load-bearing structure. It forms a rigid frame with the heat sinks on both sides through the first fixed column 4 and the second fixed column 5. After tightening the fastening bolts 33, the fixed outer shell 3 applies a radial clamping force to the ceramic outer shell 12 of the flat thyristor 1, which firmly fixes the body of the flat thyristor 1 like a "shackle", preventing any macroscopic relative movement or torsion between it and the heat sink, thus solving the displacement and friction problems under vibration.

[0023] The elastic thermally conductive silicone block 2, pre-installed in the groove 14 of the upper and lower mounting surfaces of the thyristor, is compressed when the heat sink is pressed. Its elasticity provides continuous contact pressure, compensates for the small gaps that may be caused by vibration and thermal expansion and contraction, maintains the tightness of the thermal interface, and solves the problem of increased thermal resistance. At the same time, it acts as a soft buffer pad, absorbing and isolating most of the mechanical vibration and impact stress transmitted to the flat thyristor 1 body, protecting the brittle ceramic shell 12 and the internal chip.

[0024] The foregoing description enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A seismic-resistant flat-plate thyristor, comprising a flat-plate thyristor body (1) and an external structure, wherein the flat-plate thyristor (1) includes a cover plate (11), a ceramic shell (12), and a base (13), the cover plate (11) and the base (13) being arranged parallel to each other, the ceramic shell (12) being fixedly disposed between the cover plate (11) and the base (13), and an external wiring (6) extending outward from the outer side of the ceramic shell (12), characterized in that: The external structure includes a fixed shell (3), which is fitted around the ceramic shell (12). The outer side of the fixed shell (3) is provided with a protrusion (31), and two locking channels (32) are opened through the protrusion (31). A first fixing post (4) and a second fixing post (5) are respectively installed in the two locking channels (32). One end of the first fixing post (4) and the second fixing post (5) are respectively fixedly connected to the heat sinks on both sides and locked by fastening bolts (33) provided on the outer side of the protrusion (31) so that the fixed shell (3) applies a radial clamping force pointing towards the center of the device to the ceramic shell (12). The outer mounting plane of the cover plate (11) and the base (13) are respectively provided with grooves (14). An elastic thermally conductive silicone block (2) is fixedly installed on the bottom surface of the groove (14). The thermally conductive silicone block (2) protrudes out of the groove (14) in its natural state.

2. The anti-vibration flat plate thyristor according to claim 1, characterized in that: The groove (14) is a cylindrical cavity; the thermally conductive silicone block (2) is cylindrical in shape, and its bottom surface shape and size are the same as the bottom surface of the groove (14), while its top surface shape is smaller than its bottom surface.

3. The anti-vibration flat-plate thyristor according to claim 1, characterized in that: A pressure detection plate is fixed between the bottom surface of the thermally conductive silicone block (2) and the bottom surface of the groove (14).

4. The anti-vibration flat-plate thyristor according to claim 1, characterized in that: The first fixing post (4) and the second fixing post (5) are screws, which are fixedly connected to the heat sinks on both sides by nuts.

5. The anti-vibration flat plate thyristor according to claim 1, characterized in that: The fastening bolt (33) is an internal hexagonal flat-end set screw, the flat end of which abuts against the surface of the first fixing post (4) or the second fixing post (5).

6. The anti-vibration flat plate thyristor according to claim 1, characterized in that: The height of the thermally conductive silicone block (2) protruding from the groove (14) in its natural state is 5mm to 8mm.

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