Silicon carbide rectifier capable of avoiding breakdown short circuit phenomenon

Abstract

The invention relates to the technical field of power electronic equipment, and discloses a silicon carbide rectifier capable of avoiding a breakdown short circuit phenomenon, the silicon carbide rectifier comprises a lower shell and an upper shell, the left and right sides of the upper shell are provided with air outlet grooves, the bottom of the lower shell is fixedly connected with a supporting rod, and the bottom of the inner wall of the lower shell is fixedly connected with a first fixing rod; a rectifier chip is fixedly connected to the top end of the first fixing rod, a heat dissipation mechanism is arranged at the bottom of the inner wall of the lower shell, a dustproof mechanism is arranged at the top of the upper shell, and clamping mechanisms are arranged on the left side and the right side of the lower shell. And the heat dissipation mechanism is in sliding connection with the first sliding plate through the second fixing rod, so that the heat dissipation fins can move up and down. When the rectifier chip works and emits heat, the first spring pushes the first hinge frame, and the first sliding plate and the heat dissipation fins are driven to move upwards through the hinge rod and the second hinge frame to be attached to the bottom of the rectifier chip, so that the heat dissipation area is increased, heat is absorbed more efficiently, and the heat dissipation efficiency is higher.

Description

Technical Field

[0001] This invention relates to the field of power electronic equipment technology, specifically to a silicon carbide rectifier that can avoid short circuits. Background Technology

[0002] In today's era of rapid development in power electronics technology, silicon carbide (SiC) has been widely used in the rectifier field due to its superior material properties, such as wide bandgap, high critical breakdown electric field strength, high electron saturation drift velocity, and good thermal conductivity. Compared with traditional silicon-based rectifiers, silicon carbide rectifiers exhibit many advantages, such as higher efficiency, lower switching losses, stronger high-temperature resistance, and higher power density, which can meet the stringent requirements of modern power systems for efficient, high-power-density, and highly reliable power conversion.

[0003] Currently, the industry has adopted various measures to address the breakdown and short-circuit problem of silicon carbide rectifiers. On the one hand, during chip design and manufacturing, device structures are optimized, such as by employing junction termination extension (JTE) structures and field limiting ring (FLR) structures, to improve the surface electric field distribution and increase the breakdown voltage; precise control of impurity doping concentration and distribution is also used to optimize the rectifier's electrical performance. On the other hand, in circuit design, overvoltage protection circuits are incorporated, such as using metal oxide varistors (MOVs) and transient voltage suppressor diodes (TVS) to suppress transient overvoltages; and overcurrent protection circuits, such as combinations of fuses, current sensors, and protective switches, are equipped to prevent excessive current from damaging the rectifier.

[0004] However, these existing methods have certain limitations. At the chip level, while optimizing the structure and doping can improve the breakdown voltage to some extent, the effectiveness of these measures may be greatly reduced under complex and variable real-world operating environments, such as high temperature, high humidity, and strong electromagnetic interference. Summary of the Invention

[0005] The purpose of this invention is to provide a silicon carbide rectifier that can avoid breakdown and short circuit phenomena, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a silicon carbide rectifier that can avoid breakdown and short circuit, comprising a lower shell and an upper shell, wherein the upper shell has vent slots on the left and right sides, a support rod is fixedly connected to the bottom of the lower shell, a first fixing rod is fixedly connected to the bottom of the inner wall of the lower shell, a rectifier chip is fixedly connected to the top of the first fixing rod, a heat dissipation mechanism is provided at the bottom of the inner wall of the lower shell, a dustproof mechanism is provided at the top of the upper shell, and a snap-fit ​​mechanism is provided on the left and right sides of the lower shell; The heat dissipation mechanism includes a second fixed rod, which is fixedly connected to the bottom of the inner wall of the lower shell. A first sliding plate is slidably connected to the surface of the second fixed rod. A heat dissipation fin is fixedly connected to the side of the first sliding plate near the rectifier chip. A first fixed frame is symmetrically fixedly connected to the left and right sides of the bottom of the inner wall of the lower shell. A first guide rod is fixedly connected to the front and rear sides of the first fixed frame. A first hinge frame is symmetrically slidably connected to the surface of the first guide rod. A first spring is sleeved between the inner side of the first fixed frame and the first hinge frame on the surface of the first guide rod. A hinge rod is hinged inside the first hinge frame. A second hinge frame is hinged to the other end of the hinge rod.

[0007] According to the above technical solution, the bottom of the lower shell is provided with a groove, and the heat dissipation fins move up and down in the groove. The top of the second hinge frame is fixedly connected to the bottom of the first slide plate.

[0008] According to the above technical solution, one end of the first spring is fixedly connected to the inner side of the first fixed frame, and the other end of the first spring is fixedly connected to the side of the first hinge frame near the inner side of the first fixed frame.

[0009] According to the above technical solution, the dustproof mechanism includes a fixed frame, which is disposed on the top of the upper shell. A retaining plate is fixedly connected to the inner wall of the fixed frame near the bottom. Fans are equidistantly arranged on the top of the retaining plate. A rectangular limiting ring is fixedly connected to the inner wall of the fixed frame near the top. A dustproof plate is slidably connected to the inner wall of the fixed frame. A second fixed frame is fixedly connected to the top of the upper shell near the front. A rotating shaft is rotatably connected to the left side of the second fixed frame. A gear is fixedly connected to the surface of the rotating shaft within the second fixed frame. A crank handle is fixedly connected to the right end of the rotating shaft. A sliding opening is provided on the top of the second fixed frame. The groove contains a T-shaped block that slides back and forth within it. A first rack is fixedly connected to the bottom of the T-block, and a pressure block is fixedly connected to the back of the first rack. A second guide rod is symmetrically fixedly connected to the front of the fixed frame near the top of the upper shell. A second slide plate is slidably connected to the surface of the second guide rod. A first limiting ring is fixedly connected to the surface of the second guide rod near the rear end. A second spring is sleeved between the surface of the second guide rod and the second slide plate and the first limiting ring. A second rack is fixedly connected to the top of the second slide plate. Support plates are fixedly connected to the left and right sides of the second fixed frame near the bottom of the front.

[0010] According to the above technical solution, the top of the upper shell is provided with a groove that matches the fixing frame, and the surface of the fixing frame is penetrated and fixedly connected to the groove. The top of the card plate is provided with a groove that matches the fan, and the surface of the fan is penetrated and fixedly connected to the groove. The right side of the second fixing frame is provided with a hole that matches the rotating shaft, and the surface of the rotating shaft is penetrated and rotatably connected to the hole.

[0011] According to the above technical solution, the first rack meshes with the gear, and the T-block supports the first rack, so that the first rack can move back and forth stably with the rotation of the gear. The front of the fixed frame is provided with a groove that matches the pressure block near the top, and the surface of the pressure block is slidably connected to the groove. The back of the pressure block is tightly attached to the front of the dustproof plate.

[0012] According to the above technical solution, the front end of the second spring is fixedly connected to the back of the second slide plate, the rear end of the second spring is fixedly connected to the front of the first limiting ring, the second rack meshes with the gear, the front end of the second guide rod is fixedly connected to the back of the support plate, the support plate supports the second guide rod, thereby enabling the second slide plate to slide back and forth stably on the surface of the second guide rod, and the first rack is located above the second gear.

[0013] According to the above technical solution, the locking mechanism includes an L-plate, which is fixedly connected to the right side of the lower shell. Slide rods are symmetrically arranged on the front and back of the right side of the L-plate. A pull plate is fixedly connected to the right end of the slide rod. A second limiting ring is fixedly connected to the surface of the slide rod near the right end. A first locking plate is fixedly connected to the left end of the slide rod. A third spring is sleeved between the right side of the L-plate and the first locking plate on the surface of the slide rod. A second locking plate is fixedly connected to the bottom right end of the upper shell.

[0014] According to the above technical solution, the right side of the L plate has a hole that matches the slide rod, and the slide rod surface passes through and slides left and right in the hole. The left side of the second limiting ring is in contact with the right side of the L plate. The right end of the third spring is fixedly connected to the right side of the L plate, and the left end of the third spring is fixedly connected to the right side of the first snap-fit ​​plate.

[0015] According to the above technical solution, a groove is provided at the bottom right end of the lower shell, and the surface of the second snap-fit ​​plate is penetrated and slidably connected to the groove. The cooperation between the second snap-fit ​​plate and the groove limits the lower shell and the upper shell, so that the lower shell and the upper shell can fit together precisely. There are two sets of snap-fit ​​mechanisms, which are symmetrically arranged on the left and right sides of the lower shell.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are: 1. This silicon carbide rectifier, which avoids short circuits, features a heat dissipation mechanism that slides between a second fixed rod and a first sliding plate, allowing the heat dissipation fins to move up and down. When the rectifier chip generates heat, a first spring pushes a first hinge frame, which, through a hinge rod and a second hinge frame, moves the first sliding plate and heat dissipation fins upwards, bringing them into contact with the bottom of the rectifier chip. This increases the heat dissipation area, absorbs heat more efficiently, and achieves higher heat dissipation efficiency.

[0017] 2. This silicon carbide rectifier, designed to prevent short circuits, features a dustproof mechanism. A crank handle rotates the shaft, causing gears to rotate and moving the first and second racks meshing with it. The first rack moves the pressure block back and forth, adjusting the pressure on the dustproof plate for easy removal and replacement when needed. Indirectly, the first rack, under the action of the second spring, keeps the pressure block firmly against the front of the dustproof plate, ensuring a tight fit against the inner wall of the fixing frame and effectively preventing dust from entering. A fan mounted on the clamping plate blows air into the housing. During air intake, the dustproof plate effectively filters dust from the air, protecting the rectifier chip from dust and reducing the possibility of short circuits caused by dust accumulation.

[0018] 3. This silicon carbide rectifier, designed to prevent short circuits due to breakdown, employs a snap-fit ​​mechanism consisting of an L-plate, a slide rod, a first snap-fit ​​plate, a second snap-fit ​​plate, and a third spring. During installation, the second snap-fit ​​plate of the upper shell is aligned with the groove on the bottom right end of the lower shell. The elastic action of the slide rod and the third spring ensures a tight snap-fit ​​between the first and second snap-fit ​​plates, achieving a quick and precise fit between the upper and lower shells. This snap-fit ​​method is simple to operate, requires no complex tools, and improves assembly efficiency.

[0019] 4. This silicon carbide rectifier, designed to prevent short circuits, features two symmetrically arranged snap-fit ​​mechanisms that evenly distribute the connection force, ensuring a secure connection between the lower and upper shells. During operation, this effectively prevents separation of the upper and lower shells due to vibration or other factors, ensuring the stability of the rectifier's internal structure. This improves the overall reliability and stability of the rectifier and reduces the risk of electrical connection problems and short circuits caused by loose shells. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional view of the structure of the present invention; Figure 2 This is a perspective sectional view of the lower shell of the present invention from the front. Figure 3 This is a perspective view of the second fixing rod and the first fixing frame of the present invention. Figure 4 This is a perspective view of the heat dissipation fins of the present invention; Figure 5 This is a perspective view of the first guide rod and the first spring of the present invention. Figure 6 This is a front perspective view of the fixing frame of the present invention; Figure 7 This is a front sectional perspective view of the fixing frame of the present invention; Figure 8 forFigure 6 Enlarged structural diagram at point A in the middle; Figure 9 This is a perspective sectional view of the right side of the second fixing frame of the present invention. Figure 10 This is a three-dimensional view of the second snap-fit ​​plate of the present invention; Figure 11 for Figure 10 Enlarged structural diagram at point B.

[0021] In the diagram: 1. Lower shell; 2. Upper shell; 3. Air outlet; 4. Support rod; 5. First fixing rod; 6. Rectifier chip; 7. Heat dissipation mechanism; 71. Second fixing rod; 72. First sliding plate; 73. Heat dissipation fins; 74. First fixing frame; 75. First guide rod; 76. First hinge frame; 77. First spring; 78. Hinge rod; 79. Second hinge frame; 8. Dustproof mechanism; 81. Fixing frame; 82. Clamping plate; 83. Fan; 84. Rectangular limiting ring; 85. Dustproof plate; 86. 87. Second fixed frame; 88. Rotating shaft; 89. Handle; 811. Slide groove; 812. T-block; 813. First rack; 814. Pressure block; 815. Second guide rod; 816. Second sliding plate; 817. First limiting ring; 818. Second spring; 819. Second rack; 820. Support plate; 821. Gear; 92. Snap-fit ​​mechanism; 93. L-plate; 94. Slide rod; 95. Second limiting ring; 96. Pull plate; 97. First snap-fit ​​plate; 98. Third spring; 99. Second snap-fit ​​plate. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 scope of protection of the present invention.

[0023] This invention provides the following technical solutions: Example 1 Combination Figures 1 to 5 A silicon carbide rectifier that can avoid short circuits includes a lower shell 1 and an upper shell 2. The upper shell 2 has vent slots 3 on the left and right sides. A support rod 4 is fixedly connected to the bottom of the lower shell 1. A first fixing rod 5 is fixedly connected to the bottom of the inner wall of the lower shell 1. A rectifier chip 6 is fixedly connected to the top of the first fixing rod 5. A heat dissipation mechanism 7 is provided at the bottom of the inner wall of the lower shell 1. A dustproof mechanism 8 is provided at the top of the upper shell 2. A snap-fit ​​mechanism 9 is provided on the left and right sides of the lower shell 1. The heat dissipation mechanism 7 includes a second fixing rod 71, which is fixedly connected to the bottom of the inner wall of the lower shell 1. A first sliding plate 72 is slidably connected to the surface of the second fixing rod 71. A heat dissipation fin 73 is fixedly connected to the side of the first sliding plate 72 near the rectifier chip 6. A first fixing frame 74 is symmetrically fixedly connected to the left and right sides of the bottom of the inner wall of the lower shell 1. A first guide rod 75 is fixedly connected to the front and rear sides of the first fixing frame 74. A first hinge frame 76 is symmetrically slidably connected to the surface of the first guide rod 75. A first spring 77 is sleeved between the surface of the first guide rod 75 and the inner side of the first fixing frame 74 and the first hinge frame 76. A hinge rod 78 is hinged to the first hinge frame 76. A second hinge frame 79 is hinged to the other end of the hinge rod 78.

[0024] Furthermore, a groove is provided at the bottom of the lower shell 1, and the heat dissipation fins 73 move up and down in the groove. The top of the second hinge frame 79 is fixedly connected to the bottom of the first slide plate 72.

[0025] Furthermore, one end of the first spring 77 is fixedly connected to the inner side of the first fixing frame 74, and the other end of the first spring 77 is fixedly connected to the side of the first hinge frame 76 near the inner side of the first fixing frame 74.

[0026] Example 2 See Figures 4 to 9 Furthermore, based on Example 1, a dustproof mechanism 8 was obtained.

[0027] Furthermore, the dustproof mechanism 8 includes a fixed frame 81, which is located on the top of the upper shell 2. A retaining plate 82 is fixedly connected to the inner wall of the fixed frame 81 near the bottom. Fans 83 are equidistantly arranged on the top of the retaining plate 82. A rectangular limiting ring 84 is fixedly connected to the inner wall of the fixed frame 81 near the top. A dustproof plate 85 is slidably connected to the inner wall of the fixed frame 81. A second fixed frame 86 is fixedly connected to the top of the upper shell 2 near the front. A rotating shaft 87 is rotatably connected to the left side of the second fixed frame 86. A gear 821 is fixedly connected to the surface of the rotating shaft 87 within the second fixed frame 86. A crank 88 is fixedly connected to the right end of the rotating shaft 87. A sliding groove 89 is provided on the top of the second fixed frame 86, allowing for back-and-forth sliding within the groove 89. A T-shaped block 811 is connected, and a first rack 812 is fixedly connected to the bottom of the T-shaped block 811. A pressure block 813 is fixedly connected to the back of the first rack 812. A second guide rod 814 is symmetrically fixedly connected to the front of the fixed frame 81 near the top of the upper shell 2. A second slide plate 815 is slidably connected to the surface of the second guide rod 814. A first limiting ring 816 is fixedly connected to the surface of the second guide rod 814 near the rear end. A second spring 817 is sleeved between the surface of the second guide rod 814 and the second slide plate 815 and the first limiting ring 816. A second rack 818 is fixedly connected to the top of the second slide plate 815. Support plates 819 are fixedly connected to the left and right sides of the second fixed frame 86 near the bottom of the front.

[0028] Furthermore, the top of the upper shell 2 has a groove that matches the fixing frame 81, and the surface of the fixing frame 81 is penetrated and fixedly connected to the groove. The top of the card plate 82 has a groove that matches the fan 83, and the surface of the fan 83 is penetrated and fixedly connected to the groove. The right side of the second fixing bracket 86 has a hole that matches the rotating shaft 87, and the surface of the rotating shaft 87 is penetrated and rotatably connected to the hole.

[0029] Furthermore, the first rack 812 meshes with the gear 821, and the T-block 811 supports the first rack 812, so that the first rack 812 can move back and forth stably with the rotation of the gear 821. The front of the fixed frame 81 is provided with a groove that matches the pressure block 813 near the top, and the surface of the pressure block 813 is slidably connected to the groove. The back of the pressure block 813 is tightly attached to the front of the dustproof plate 85.

[0030] Furthermore, the front end of the second spring 817 is fixedly connected to the back of the second slide plate 815, the rear end of the second spring 817 is fixedly connected to the front of the first limiting ring 816, the second rack 818 meshes with the gear 821, the front end of the second guide rod 814 is fixedly connected to the back of the support plate 819, and the support plate 819 supports the second guide rod 814, thereby enabling the second slide plate 815 to slide back and forth stably on the surface of the second guide rod 814, and the first rack 812 is located above the second gear 821.

[0031] Example 3 See Figures 10 to 11 Furthermore, based on Embodiment 1, a snap-fit ​​mechanism 9 is obtained.

[0032] Furthermore, the locking mechanism 9 includes an L-plate 91, which is fixedly connected to the right side of the lower shell 1. Slide rods 92 are symmetrically arranged on the front and back of the right side of the L-plate 91. A pull plate 94 is fixedly connected to the right end of the slide rod 92. A second limiting ring 93 is fixedly connected to the surface of the slide rod 92 near the right end. A first locking plate 95 is fixedly connected to the left end of the slide rod 92. A third spring 96 is sleeved between the right side of the L-plate 91 and the first locking plate 95 on the surface of the slide rod 92. A second locking plate 97 is fixedly connected to the bottom right end of the upper shell 2.

[0033] Furthermore, the right side of the L plate 91 has a hole that matches the slide rod 92, and the slide rod 92 passes through the surface and slides left and right in the hole. The left side of the second limiting ring 93 is in contact with the right side of the L plate 91. The right end of the third spring 96 is fixedly connected to the right side of the L plate 91, and the left end of the third spring 96 is fixedly connected to the right side of the first snap-fit ​​plate 95.

[0034] Furthermore, a groove is provided at the bottom right end of the lower shell 1, and the surface of the second snap-fit ​​plate 97 is penetrated and slidably connected to the groove. The cooperation between the second snap-fit ​​plate 97 and the groove limits the lower shell 1 and the upper shell 2, so that the lower shell 1 and the upper shell 2 can fit together precisely. There are two sets of snap-fit ​​mechanisms 9, which are symmetrically arranged on the left and right sides of the lower shell 1.

[0035] In actual operation, when this device is in use, the rectifier chip 6 generates heat. As the temperature rises, the heat dissipation demand increases. First, thermal silicone is applied to the top of the heat sink fins 73, and then the heat sink fins 73 are loosened. At this time, the limiting force on the first spring 77 is released. Then, the two first hinge frames 76 move towards each other under the influence of the elastic force of the first spring 77. The two first hinge frames 76 drive the two second hinge frames 79 to move upward through the cooperation of the hinge rod 78, which in turn drives the first slide plate 72 to move upward on the surface of the second fixed rod 71, thereby driving the heat sink fins 73 to move upward, so that the top of the heat sink fins 73 is in contact with the bottom of the rectifier chip 6. The heat generated by the rectifier chip 6 is quickly dissipated through the good thermal conductivity of the heat sink fins 73, thereby cooling the rectifier chip 6 and effectively reducing the temperature of the rectifier chip 6, reducing the risk of short circuit due to high temperature. The fan 83 on the card plate 82 inside the fixed frame 81 is started, drawing outside air into the upper shell 2 to provide air circulation for auxiliary heat dissipation inside the rectifier. During air intake, the dustproof plate 85 filters the air, preventing dust from entering. The rectangular limiting ring 84 ensures the dustproof plate 85 remains stable as it slides up and down within the fixed frame 81, guaranteeing its dustproof effect. When the dustproof plate 85 needs to be replaced, the crank handle 88 is turned, causing the rotating shaft 87 to rotate, and the gear 821 on the rotating shaft 87 rotates accordingly. The first rack 812, meshing with the gear 821, moves back and forth along the slide groove 89 under the support of the T-block 811, thereby driving the pressure block 813 forward. Release the force of the pressure block 813 on the dustproof plate 85. At the same time, the rotation of the gear 821 will also drive the second rack 818 to move backward, thereby driving the second slide bar 92 to move backward on the surface of the second slide bar 92, compressing the second spring 817. Then, take out the dustproof plate 85 from the fixed frame 81, and then put the new dustproof plate 85 into the fixed frame 81. Then release the crank handle 88. At this time, the second rack 818 will move forward through the elastic force of the second spring 817, while the first rack 812 will move backward through the cooperation of the gear 821, thereby driving the pressure block 813 to move backward, so that the back of the pressure block 813 tightly abuts against the front of the dustproof plate 85, thereby limiting the dustproof plate 85. Align the upper shell 2 with the lower shell 1, so that the second snap-fit ​​plate 97 at the bottom right end of the upper shell 2 is aligned with the groove opened at the bottom right end of the lower shell 1. In the L plates on the left and right sides of the shell, the third spring 96 is in a natural or pre-compressed state, pushing the first snap-fit ​​plate 95 to move to the left. When the second locking plate 97 is inserted into the slot, the first locking plate 95, under the action of the third spring 96, tightly locks the second locking plate 97, achieving a tight connection between the lower shell 1 and the upper shell 2. The slide rod 92 slides left and right in the hole on the right side of the L plate, ensuring the linearity and stability of the movement of the first locking plate 95, and the second limiting ring 93 prevents the slide rod 92 from moving excessively and coming off.Two sets of symmetrically arranged snap-fit ​​mechanisms 9 evenly distribute the connecting force, ensuring a precise and stable fit between the lower shell 1 and the upper shell 2. This protects the internal structure of the rectifier and prevents the upper and lower shells 1 from separating due to external vibrations or other factors, thus affecting the rectifier's performance. For disassembly, pull the pull plate 94, which moves the slide rod 92 and the first snap-fit ​​plate 95 to the right, separating the first snap-fit ​​plate 95 from the second snap-fit ​​plate 97, thus separating the upper shell 2 and the lower shell 1.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A silicon carbide rectifier that avoids breakdown and short circuit, comprising a lower housing (1) and an upper housing (2), characterized in that: The upper shell (2) has air vents (3) on the left and right sides. The bottom of the lower shell (1) is fixedly connected to a support rod (4). The bottom of the inner wall of the lower shell (1) is fixedly connected to a first fixing rod (5). The top of the first fixing rod (5) is fixedly connected to a rectifier chip (6). The bottom of the inner wall of the lower shell (1) is provided with a heat dissipation mechanism (7). The top of the upper shell (2) is provided with a dustproof mechanism (8). The left and right sides of the lower shell (1) are provided with snap-fit ​​mechanisms (9). The heat dissipation mechanism (7) includes a second fixed rod (71), which is fixedly connected to the bottom of the inner wall of the lower shell (1). A first sliding plate (72) is slidably connected to the surface of the second fixed rod (71). A heat dissipation fin (73) is fixedly connected to the side of the first sliding plate (72) near the rectifier chip (6). A first fixed frame (74) is symmetrically fixedly connected to the left and right sides of the bottom of the inner wall of the lower shell (1). A first guide rod (75) is fixedly connected to the front and back sides of the first fixed frame (74). A first hinge frame (76) is symmetrically slidably connected to the surface of the first guide rod (75). A first spring (77) is sleeved between the surface of the first guide rod (75) and the first hinge frame (76). A hinge rod (78) is hinged inside the first hinge frame (76). A second hinge frame (79) is hinged to the other end of the hinge rod (78). The latching mechanism (9) includes an L-plate (91), which is fixedly connected to the right side of the lower shell (1). Slide rods (92) are symmetrically arranged on the right side of the L-plate (91). A pull plate (94) is fixedly connected to the right end of the slide rod (92). A second limiting ring (93) is fixedly connected to the surface of the slide rod (92) near the right end. A first latching plate (95) is fixedly connected to the left end of the slide rod (92). A third spring (96) is sleeved between the right side of the L-plate (91) and the first latching plate (95) on the surface of the slide rod (92). A second latching plate (97) is fixedly connected to the bottom right end of the upper shell (2).

2. A silicon carbide rectifier that avoids breakdown and short circuits according to claim 1, characterized in that: The dustproof mechanism (8) includes a fixed frame (81), which is located on the top of the upper shell (2). A card plate (82) is fixedly connected to the inner wall of the fixed frame (81) near the bottom. Fans (83) are equidistantly arranged on the top of the card plate (82). A rectangular limiting ring (84) is fixedly connected to the inner wall of the fixed frame (81) near the top. A dustproof plate (85) is slidably connected to the inner wall of the fixed frame (81). A second fixed frame (86) is fixedly connected to the top of the upper shell (2) near the front. A rotating shaft (87) is rotatably connected to the left side of the second fixed frame (86). A gear (821) is fixedly connected to the surface of the rotating shaft (87) within the second fixed frame (86). A crank (88) is fixedly connected to the right end of the rotating shaft (87). A sliding groove (89) is provided on the top of the second fixed frame (86). A T-shaped block (811) is slidably connected to the front and back of the inner frame (81). A first rack (812) is fixedly connected to the bottom of the T-shaped block (811). A pressure block (813) is fixedly connected to the back of the first rack (812). A second guide rod (814) is symmetrically fixedly connected to the front of the fixed frame (81) near the top of the upper shell (2). A second slide plate (815) is slidably connected to the surface of the second guide rod (814). A first limiting ring (816) is fixedly connected to the surface of the second guide rod (814) near the rear end. A second spring (817) is sleeved between the second slide plate (815) and the first limiting ring (816) on the surface of the second guide rod (814). A second rack (818) is fixedly connected to the top of the second slide plate (815). Support plates (819) are fixedly connected to the left and right sides of the second fixed frame (86) near the bottom of the front.

3. A silicon carbide rectifier that avoids breakdown and short circuits according to claim 2, characterized in that: The top of the upper shell (2) is provided with a groove that matches the fixing frame (81), and the surface of the fixing frame (81) is penetrated and fixedly connected to the groove. The top of the card plate (82) is provided with a groove that matches the fan (83), and the surface of the fan (83) is penetrated and fixedly connected to the groove. The right side of the second fixing bracket (86) is provided with a hole that matches the rotating shaft (87), and the surface of the rotating shaft (87) is penetrated and rotatably connected to the hole.

4. A silicon carbide rectifier that avoids breakdown and short circuits according to claim 3, characterized in that: The first rack (812) meshes with the gear (821). The front of the fixed frame (81) near the top is provided with a groove that matches the pressure block (813). The surface of the pressure block (813) is penetrated and slidably connected to the groove. The back of the pressure block (813) is tightly attached to the front of the dustproof plate (85).

5. A silicon carbide rectifier that avoids breakdown and short circuits according to claim 4, characterized in that: The front end of the second spring (817) is fixedly connected to the back of the second slide plate (815), the rear end of the second spring (817) is fixedly connected to the front of the first limiting ring (816), the second rack (818) meshes with the gear (821), the front end of the second guide rod (814) is fixedly connected to the back of the support plate (819), and the first rack (812) is located above the second gear (821).

6. A silicon carbide rectifier that avoids breakdown and short circuits according to claim 1, characterized in that: The L plate (91) has a hole on the right side that matches the slide rod (92), and the slide rod (92) is connected to the hole by sliding left and right through the surface. The left side of the second limiting ring (93) is in contact with the right side of the L plate (91). The right end of the third spring (96) is fixedly connected to the right side of the L plate (91), and the left end of the third spring (96) is fixedly connected to the right side of the first snap-fit ​​plate (95).

7. A silicon carbide rectifier that avoids breakdown and short circuits according to claim 6, characterized in that: The bottom right end of the lower shell (1) has a groove, and the surface of the second snap plate (97) is penetrated and slidably connected to the groove. There are two sets of snap-fit ​​mechanisms (9), which are symmetrically arranged on the left and right sides of the lower shell (1).

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