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] The invention relates to the technical field of power electronic equipment, in particular to a silicon carbide rectifier capable of avoiding breakdown short circuit phenomenon. Background Art

[0002] In today's era of rapid development of power electronics technology, silicon carbide (SiC) has been widely used in the rectifier field due to its excellent 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 show many advantages, such as higher efficiency, lower switching loss, stronger high temperature resistance and higher power density, which can meet the stringent requirements of modern power systems for high efficiency, high power density and high reliability power conversion.

[0003] At present, in order to solve the breakdown short circuit problem of silicon carbide rectifiers, the industry has taken a variety of measures. On the one hand, in the process of chip design and manufacturing, by optimizing the device structure, such as using the junction terminal extension (JTE) structure and the field limiting ring (FLR) structure, the surface electric field distribution of the device is improved and the breakdown voltage is increased; the impurity doping concentration and distribution are precisely controlled to optimize the electrical performance of the rectifier. On the other hand, in the circuit design, an overvoltage protection circuit is added, such as the use of metal oxide varistors (MOVs), transient voltage suppression diodes (TVS) and other components to suppress transient overvoltages; equipped with overcurrent protection circuits, such as a combination of fuses, current sensors and protection switches, to prevent excessive currents from damaging the rectifier.

[0004] However, these existing methods have certain limitations. At the chip level, although optimizing the structure and doping can improve the breakdown voltage to a certain extent, the effectiveness of these measures may be greatly reduced in complex and changeable actual working environments, such as high temperature, high humidity, strong electromagnetic interference, etc. Summary of the invention

[0005] The object of the present invention is to provide a rectifier for silicon carbide that can avoid breakdown short circuit phenomenon, so as to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a rectifier for silicon carbide that can avoid breakdown short circuit phenomenon, comprising a lower shell and an upper shell, the upper shell is provided with air outlet grooves on the left and right sides, the bottom of the lower shell is fixedly connected to a support rod, the bottom of the inner wall of the lower shell is fixedly connected to a first fixing rod, the top of the first fixing rod is fixedly connected to a rectifier chip, the bottom of the inner wall of the lower shell is provided with a heat dissipation mechanism, the top of the upper shell is provided with a dustproof mechanism, and the left and right sides of the lower shell are provided with a clamping mechanism; The heat dissipation mechanism includes a second fixing rod, which is fixedly connected to the bottom of the inner wall of the lower shell. A first sliding plate is slidably connected up and down on the surface of the second fixing rod. A heat dissipation fin is fixedly connected to one side of the first sliding plate close to the rectifier chip. First fixing frames are symmetrically and fixedly connected to the left and right sides of the bottom of the inner wall of the lower shell. First guide rods are fixedly connected to the front and rear sides inside the first fixing frames. First articulated frames are slidably connected to the front and rear of the surface of the first guide rods. A first spring is sleeved between the inner side of the first fixing frame and the first articulated frame on the surface of the first guide rod. An articulated rod is hinged inside the first articulated frame, and the other end of the articulated rod is hinged to a second articulated frame.

[0007] According to the above technical solution, a groove is formed at the bottom of the lower shell, and the heat dissipation fin moves up and down in the groove. The top of the second articulated frame is fixedly connected to the bottom of the first sliding plate.

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

[0009] According to the above technical solution, the dust prevention mechanism includes a fixing frame, which is arranged on the top of the upper shell. A clamping plate is fixedly connected to the inner wall of the fixing frame near the bottom. Air blowers are equidistantly arranged on the top of the clamping plate. A rectangular limiting ring is fixedly connected to the inner wall of the fixing frame near the top. A dust prevention plate is slidably connected up and down on the inner wall of the fixing frame. A second fixing frame is fixedly connected to the front of the top of the upper shell. A rotating shaft is rotatably connected to the left side inside the second fixing frame. A gear is fixedly connected to the surface of the rotating shaft inside the second fixing frame. A crank is fixedly connected to the right end of the rotating shaft. A chute is formed at the top of the second fixing frame. A T-shaped block is slidably connected to the front and rear in the chute. A first rack is fixedly connected to the bottom of the T-shaped block. A pressing block is fixedly connected to the back of the first rack. Second guide rods are symmetrically and fixedly connected to the left and right of the front of the fixing frame near the top of the upper shell. A second sliding plate is slidably connected to the front and rear of the surface of the second guide rods. A first limiting ring is fixedly connected to the surface of the second guide rods near the rear end. A second spring is sleeved between the second sliding plate and the first limiting ring on the surface of the second guide rods. A second rack is fixedly connected to the top of the second sliding plate. Support plates are fixedly connected to the left and right sides near the front bottom inside the second fixing frame.

[0010] According to the above technical solution, a groove matching the fixing frame is formed at the top of the upper shell, and the surface of the fixing frame penetrates and is fixedly connected to the groove. A groove matching the air blower is formed at the top of the clamping plate, and the surface of the air blower penetrates and is fixedly connected to the groove. A hole matching the rotating shaft is formed on the right side of the second fixing frame, and the surface of the rotating shaft penetrates and is rotatably connected to the hole.

[0011] According to the above technical solution, the first rack meshes with the gear, and the T-shaped block supports the first rack, enabling the first rack to move back and forth stably as the gear rotates. A slot matching the pressing block is provided near the top of the front surface of the fixed frame, and the surface of the pressing block penetrates and is slidably connected back and forth in the slot. The back surface of the pressing block is tightly attached to the front surface of the dust-proof plate.

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

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

[0014] According to the above technical solution, a hole matching the sliding rod is provided on the right side of the L-shaped plate, and the surface of the sliding rod penetrates and is slidably connected left and right in the hole. The left side of the second limiting plate is attached to the right side of the L-shaped plate. The right end of the third spring is fixedly connected to the inner right side of the L-shaped plate, and the left end of the third spring is fixedly connected to the right side of the first clamping plate.

[0015] According to the above technical solution, a slot is provided at the right end of the bottom of the lower shell, and the surface of the second clamping plate penetrates and is slidably connected up and down in the slot. The cooperation between the second clamping plate and the slot limits the lower shell and the upper shell, enabling the lower shell and the upper shell to fit precisely. There are two groups of clamping 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 as follows: 1. For the silicon carbide rectifier that can avoid breakdown and short-circuit phenomena, the heat dissipation mechanism is slidably connected to the first sliding plate through the second fixed rod, enabling the heat dissipation fins to move up and down. When the rectifier chip works and generates heat, the first spring pushes the first articulated frame, and drives the first sliding plate and the heat dissipation fins to move upward through the articulated rod and the second articulated frame, fitting with the bottom of the rectifier chip, increasing the heat dissipation area, absorbing heat more efficiently, and having a higher heat dissipation efficiency.

[0017] 2. The silicon carbide rectifier can avoid breakdown short circuit phenomenon. The dustproof mechanism rotates the shaft through the crank, which drives the gear to rotate and moves the first rack and the second rack meshing with it. The first rack drives the pressure block to move forward and backward, and the degree of compression on the dustproof plate can be adjusted, which is convenient for easy removal or installation of the dustproof plate for cleaning or replacement when necessary. Under the indirect action of the second spring, the first rack makes the pressure block tightly press against the front of the dustproof plate to ensure that it fits tightly to the inner wall of the fixed frame and effectively blocks dust from entering. The fan is installed on the card plate and blows air into the shell. During the air intake process, the dustproof plate can effectively filter the dust in the air, protect the rectifier chip from the influence of dust, and reduce the possibility of short circuit due to dust accumulation.

[0018] 3. The rectifier for silicon carbide that can avoid breakdown short circuit phenomenon adopts a combination design of L plate, slide bar, first clip plate, second clip plate and third spring for the clipping mechanism. During installation, align the second clip plate of the upper shell with the groove at the right end of the bottom of the lower shell, and through the elastic action of the slide bar and the third spring, the first clip plate and the second clip plate are tightly clipped to achieve rapid and accurate fitting of the lower shell and the upper shell. This clipping method is simple to operate, does not require complex tools, and improves assembly efficiency.

[0019] 4. The silicon carbide rectifier that can avoid breakdown short circuit has two sets of symmetrically arranged clamping mechanisms that can evenly distribute the connection force and ensure that the lower shell and the upper shell are firmly connected. During the operation of the rectifier, it can effectively prevent the upper and lower shells from separating due to factors such as vibration, ensure the stability of the internal structure of the rectifier, and thus improve the overall reliability and stability of the rectifier, and reduce the electrical connection problems and breakdown short circuit risks that may be caused by loose shells. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a three-dimensional diagram of the structure of the present invention; Figure 2 This is a front cutaway stereoscopic view of the lower shell of the structure of the present invention; Figure 3 A three-dimensional diagram of the second fixing rod and the first fixing frame of the structure of the present invention; Figure 4 This is a three-dimensional diagram of the heat dissipation fin structure of the present invention; Figure 5 A three-dimensional diagram of the first guide rod and the first spring of the structure of the present invention; Figure 6 This is a front perspective view of the structural fixing frame of the present invention; Figure 7 It is a front cutaway perspective view of the structural fixing frame of the present invention; Figure 8 forFigure 6 Schematic diagram of the enlarged structure at A in Figure 9 Perspective view of the right-side cross-section of the second fixing frame of the structure of the present invention; Figure 10 Perspective view of the second clamping plate of the structure of the present invention; Figure 11 is Figure 10 Schematic diagram of the enlarged structure at B in

[0021] In the figure: 1, lower shell; 2, upper shell; 3, air outlet groove; 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, dust-proof mechanism; 81, fixing frame; 82, clamping plate; 83, fan; 84, rectangular limiting ring; 85, dust-proof plate; 86, second fixing frame; 87, rotating shaft; 88, crank; 89, sliding groove; 811, T-shaped block; 812, first rack; 813, pressing block; 814, second guide rod; 815, second sliding plate; 816, first limiting ring; 817, second spring; 818, second rack; 819, support plate; 821, gear; 9, clamping mechanism; 91, L-shaped plate; 92, sliding rod; 93, second limiting ring; 94, pulling plate; 95, first clamping plate; 96, third spring; 97, second clamping plate. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] The present invention provides the following technical solutions: Embodiment 1

[0024] Combined with Figures 1 to 5 , a silicon carbide rectifier that can avoid breakdown and short-circuit phenomena, including a lower shell 1 and an upper shell 2. Air outlet grooves 3 are provided on the left and right sides of the upper shell 2. 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 inner wall of the lower shell 1. The top of the first fixing rod 5 is fixedly connected to a rectifier chip 6. A heat dissipation mechanism 7 is provided on the bottom inner wall of the lower shell 1. A dust-proof mechanism 8 is provided on the top of the upper shell 2. Clamping mechanisms 9 are provided on the left and right sides of the lower shell 1; The heat dissipation mechanism 7 includes a second fixing rod 71, the second fixing rod 71 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 up and down, a heat dissipation fin 73 is fixedly connected to one side of the first sliding plate 72 close to the rectifier chip 6, first fixing frames 74 are symmetrically and fixedly connected to the left and right sides of the bottom of the inner wall of the lower shell 1, first guide rods 75 are fixedly connected to the front and rear sides inside the first fixing frames 74, first articulated frames 76 are slidably connected to the front and rear of the surface of the first guide rods 75 symmetrically, a first spring 77 is sleeved between the inner side of the first fixing frame 74 and the first articulated frame 76 on the surface of the first guide rod 75, an articulated rod 78 is articulated inside the first articulated frame 76, and the other end of the articulated rod 78 is articulated to a second articulated frame 79.

[0025] Further, a groove is formed at the bottom of the lower shell 1, and the heat dissipation fin 73 moves up and down in the groove, and the top of the second articulated frame 79 is fixedly connected to the bottom of the first sliding plate 72.

[0026] Further, 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 articulated frame 76 close to the inner side of the first fixing frame 74. Embodiment 2

[0027] Refer to Figures 4 to 9 On the basis of Embodiment 1, a dust prevention mechanism 8 is further obtained.

[0028] Further, the dust prevention mechanism 8 includes a fixing frame 81, the fixing frame 81 is arranged on the top of the upper shell 2, a clamping plate 82 is fixedly connected to the inner wall of the fixing frame 81 close to the bottom, a fan 83 is arranged equidistantly on the top of the clamping plate 82, a rectangular limiting ring 84 is fixedly connected to the inner wall of the fixing frame 81 close to the top, a dust prevention plate 85 is slidably connected to the inner wall of the fixing frame 81 up and down, a second fixing frame 86 is fixedly connected to the top of the upper shell 2 close to the front, a rotating shaft 87 is rotatably connected to the left side inside the second fixing frame 86, a gear 821 is fixedly connected to the surface of the rotating shaft 87 inside the second fixing frame 86, a crank 88 is fixedly connected to the right end of the rotating shaft 87, a chute 89 is formed at the top of the second fixing frame 86, a T-shaped block 811 is slidably connected to the front and rear inside the chute 89, a first rack 812 is fixedly connected to the bottom of the T-shaped block 811, a pressing block 813 is fixedly connected to the back of the first rack 812, second guide rods 814 are symmetrically and fixedly connected to the front of the fixing frame 81 close to the top of the upper shell 2, a second sliding plate 815 is slidably connected to the front and rear of the surface of the second guide rods 814, a first limiting ring 816 is fixedly connected to the surface of the second guide rods 814 close to the rear end, a second spring 817 is sleeved between the second sliding 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 sliding plate 815, and support plates 819 are fixedly connected to the left and right sides inside the second fixing frame 86 close to the front bottom.

[0029] Further, a slot matching the fixing frame 81 is formed at the top of the upper shell 2, and the surface of the fixing frame 81 penetrates and is fixedly connected to the slot. A slot matching the blower 83 is formed at the top of the clamping plate 82, and the surface of the blower 83 penetrates and is fixedly connected to the slot. A hole matching the rotating shaft 87 is formed on the right side of the second fixing frame 86, and the surface of the rotating shaft 87 penetrates and is rotatably connected to the hole.

[0030] Further, the first rack 812 meshes with the gear 821. The T-shaped block 811 supports the first rack 812, enabling the first rack 812 to stably move back and forth as the gear 821 rotates. A slot matching the pressing block 813 is formed near the top on the front surface of the fixing frame 81, and the surface of the pressing block 813 penetrates and is slidably connected back and forth in the slot. The back surface of the pressing block 813 tightly adheres to the front surface of the dust-proof plate 85.

[0031] Further, the front end of the second spring 817 is fixedly connected to the back surface of the second sliding plate 815, and the rear end of the second spring 817 is fixedly connected to the front surface 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 surface of the support plate 819. The support plate 819 supports the second guide rod 814, enabling the second sliding plate 815 to stably slide back and forth on the surface of the second guide rod 814. The first gear 821 is located above the second gear 821. Embodiment III

[0032] Refer to Figures 10 to 11 and, on the basis of Embodiment I, the clamping mechanism 9 is further obtained.

[0033] Further, the clamping mechanism 9 includes an L-shaped plate 91. The L-shaped plate 91 is fixedly connected to the right side of the lower shell 1. Slide rods 92 are symmetrically arranged front and back on the right side of the L-shaped 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 clamping plate 95 is fixedly connected to the left end of the slide rod 92. A third spring 96 is sleeved on the surface of the slide rod 92 between the inner right side of the L-shaped plate 91 and the first clamping plate 95. A second clamping plate 97 is fixedly connected to the right end of the bottom of the upper shell 2.

[0034] Further, a hole matching the slide rod 92 is formed on the right side of the L-shaped plate 91, and the surface of the slide rod 92 penetrates and is slidably connected left and right in the hole. The left side of the second limiting plate is attached to the right side of the L-shaped plate 91. The right end of the third spring 96 is fixedly connected to the inner right side of the L-shaped plate 91, and the left end of the third spring 96 is fixedly connected to the right side of the first clamping plate 95.

[0035] Furthermore, a groove is provided at the right end of the bottom of the lower shell 1, and the surface of the second clamping plate 97 penetrates and is slidably connected up and down in the groove. The cooperation between the second clamping plate 97 and the groove limits the lower shell 1 and the upper shell 2, enabling the lower shell 1 and the upper shell 2 to be accurately fitted. There are two sets of clamping mechanisms 9, which are symmetrically arranged on the left and right sides of the lower shell 1.

[0036] In actual operation, when this device is used, the rectifier chip 6 generates heat during operation. As the temperature rises, the heat dissipation demand increases. First, heat dissipation silicone is applied to the top of the heat sink 73, and then the heat sink 73 is loosened. At this time, the limiting force on the first spring 77 is released, and then the two first hinge frames 76 move toward 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, and then drive the first slide plate 72 to move upward on the surface of the second fixed rod 71, thereby driving the heat sink 73 to move upward, so that the top of the heat sink 73 is in contact with the bottom of the rectifier chip 6, and the heat generated by the rectifier chip 6 is quickly dissipated through the good thermal conductivity of the heat sink 73, and then the rectifier chip 6 is heat-dissipated and cooled, thereby effectively reducing the temperature of the rectifier chip 6 and reducing the risk of breakdown and short circuit due to high temperature. The fan 83 on the card plate 82 in the fixed frame 81 is started to suck outside air into the upper shell 2, providing air circulation and auxiliary heat dissipation for the inside of the rectifier. During the air intake process, the dustproof plate 85 filters the air to prevent dust from entering. The rectangular limiting ring 84 ensures that the dustproof plate 85 is stable when sliding up and down in the fixed frame 81, ensuring the dustproof effect. When the dustproof plate 85 needs to be replaced, the crank 88 is turned, and the crank 88 drives 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 forward and backward along the slide groove 89 under the support of the T-block 811, thereby driving the pressing block 813 to move forward. The force of the pressure block 813 on the dustproof plate 85 is released, and 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, and then taking out the dustproof plate 85 in the fixed frame 81, and then putting the new dustproof plate 85 into the fixed frame 81, and then releasing the crank 88. At this time, the second rack 818 will move forward through the elastic force of the second spring 817, and 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 is tightly against the front of the dustproof plate 85, thereby limiting the dustproof plate 85, aligning the upper shell 2 with the lower shell 1, and aligning the second clip plate 97 at the right end of the bottom of the upper shell 2 with the groove opened at the right end of the bottom of the lower shell 1, and 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 clip plate 95 to move left. When the second clamping plate 97 is inserted into the slot, the first clamping plate 95, under the action of the third spring 96, tightly clamps the second clamping plate 97, thereby realizing a tight connection between the lower shell 1 and the upper shell 2. The slide bar 92 slides left and right in the hole on the right side of the L plate to ensure the linearity and stability of the movement of the first clamping plate 95, and the second limiting ring 93 prevents the slide bar 92 from excessively moving and falling out.Two sets of symmetrically arranged clamping mechanisms 9 evenly distribute the connection force to ensure that the lower shell 1 and the upper shell 2 are accurately and firmly fitted, protecting the internal structure of the rectifier and preventing the separation of the upper and lower shells 1 due to external vibrations or other factors, which may affect the performance of the rectifier. For disassembly, pull the pull plate 94 to drive the slide rod 92 and the first clamping plate 95 to move to the right, so that the first clamping plate 95 is separated from the second clamping plate 97, and then the upper shell 2 and the lower shell 1 can be separated.

[0037] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0038] Finally, it should be noted that the above are only 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 perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A rectifier for silicon carbide capable of avoiding breakdown short circuit phenomenon, comprising a lower shell (1) and an upper shell (2), characterized in that: The upper shell (2) is provided with air outlet grooves (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), and the left and right sides of the lower shell (1) are provided with a clamping mechanism (9); The heat dissipation mechanism (7) comprises a second fixing rod (71), the second fixing rod (71) being fixedly connected to the bottom of the inner wall of the lower shell (1), a first slide plate (72) being slidably connected to the surface of the second fixing rod (71) in an up-and-down manner, a heat dissipation fin (73) being fixedly connected to the side of the first slide plate (72) close to the rectifier chip (6), a first fixing frame (74) being 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) being fixedly connected to the front and rear sides of the first fixing frame (74), a first hinge frame (76) being symmetrically slidably connected to the surface of the first guide rod (75), a first spring (77) being sleeved on the surface of the first guide rod (75) between the inner side of the first fixing frame (74) and the first hinge frame (76), a hinge rod (78) being hingedly connected to the first hinge frame (76), and a second hinge frame (79) being hingedly connected to the other end of the hinge rod (78).

2. A rectifier for silicon carbide capable of avoiding breakdown short circuit phenomenon according to claim 1, characterized in that: The bottom of the lower shell (1) is provided with a groove, and the heat dissipation fins (73) move up and down in the groove, and the top of the second hinged frame (79) is fixedly connected to the bottom of the first slide plate (72).

3. A rectifier for silicon carbide capable of avoiding breakdown short circuit phenomenon according to claim 2, characterized in that: 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 a side of the first hinge frame (76) close to the inner side of the first fixing frame (74).

4. A rectifier for silicon carbide capable of avoiding breakdown short circuit phenomenon according to claim 3, characterized in that: The dustproof mechanism (8) comprises a fixed frame (81), the fixed frame (81) being arranged at the top of the upper shell (2), a card plate (82) being fixedly connected to the inner wall of the fixed frame (81) near the bottom, a fan (83) being equidistantly arranged on the top of the card plate (82), a rectangular limit ring (84) being fixedly connected to the inner wall of the fixed frame (81) near the top, a dustproof plate (85) being slidably connected to the inner wall of the fixed frame (81) up and down, a second fixed frame (86) being fixedly connected to the top of the upper shell (2) near the front, a rotating shaft (87) being rotatably connected to the left side of the second fixed frame (86), a gear (821) being fixedly connected to the surface of the rotating shaft (87) in the second fixed frame (86), a crank (88) being fixedly connected to the right end of the rotating shaft (87), a slide groove (89) being provided at the top of the second fixed frame (86), the slide groove (89) A T-shaped block (811) is slidably connected to the inside in the front and rear directions, 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) in the front and rear directions, 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), and support plates (819) are fixedly connected to the left and right sides of the second fixed frame (86) near the bottom of the front direction.

5. The silicon carbide rectifier capable of avoiding breakdown short circuit phenomenon according to claim 4, characterized in that: The top of the upper shell (2) is provided with a groove matching the fixing frame (81), and the surface of the fixing frame (81) penetrates and is fixedly connected in the groove; the top of the clamping plate (82) is provided with a groove matching the fan (83), and the surface of the fan (83) penetrates and is fixedly connected in the groove; the right side of the second fixing frame (86) is provided with a hole matching the rotating shaft (87), and the surface of the rotating shaft (87) penetrates and is rotatably connected in the hole.

6. A rectifier for silicon carbide capable of avoiding breakdown short circuit phenomenon according to claim 5, characterized in that: The first rack (812) meshes with the gear (821); a groove matching the pressing block (813) is provided on the front side of the fixed frame (81) near the top; the surface of the pressing block (813) penetrates and is slidably connected to the groove; the back side of the pressing block (813) is tightly fitted to the front side of the dustproof plate (85).

7. A rectifier for silicon carbide capable of avoiding breakdown short circuit phenomenon according to claim 6, 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) is meshed 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 gear (821) is located above the second gear (821).

8. The silicon carbide rectifier capable of avoiding breakdown short circuit phenomenon according to claim 7, characterized in that: The clamping mechanism (9) comprises an L-plate (91), the L-plate (91) being fixedly connected to the right side of the lower shell (1), a sliding rod (92) being symmetrically arranged on the right side of the L-plate (91), a pulling plate (94) being fixedly connected to the right end of the sliding rod (92), a second limiting ring (93) being fixedly connected to the surface of the sliding rod (92) near the right end, a first clamping plate (95) being fixedly connected to the left end of the sliding rod (92), a third spring (96) being sleeved on the surface of the sliding rod (92) between the right side of the L-plate (91) and the first clamping plate (95), and a second clamping plate (97) being fixedly connected to the right end of the bottom of the upper shell (2).

9. A rectifier for silicon carbide capable of avoiding breakdown short circuit phenomenon according to claim 8, characterized in that: The right side of the L plate (91) is provided with a hole matching the slide bar (92), and the surface of the slide bar (92) penetrates and is slidably connected to the hole. The left side of the second limit plate 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 clamping plate (95).

10. A rectifier for silicon carbide capable of avoiding breakdown short circuit phenomenon according to claim 9, characterized in that: A groove is provided at the right end of the bottom of the lower shell (1), and the second clamping plate (97) penetrates the surface and is slidably connected in the groove. The clamping mechanism (9) has two groups and is symmetrically arranged on the left and right sides of the lower shell (1).

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