High current trench gate field stop igbt power device

Abstract

The utility model discloses a high current trench gate field stop IGBT power device relates to electric element technical field, solves the passive heat dissipation of many dependence shell to external radiator of existing structure, and the main terminal is as the current transmission core, and the joule heat produced when operating is difficult to export quickly, influences the service life, and it is difficult to carry out quick maintenance and repair, and the problem of difficult dismounting. High current trench gate field stop IGBT power device, include: shell, the shell adopts rectangular block structure, the hollow cylindrical structure's fixed link of inside in the rectangular recess of shell top four all around is fixedly set up, and the inside filling of fixed link is provided with heat -conducting liquid, and the outside of fixed link is provided with the limiting block of L shape block structure and slides, and the heat of main terminal is transferred to fixed link with copper limiting block with high efficiency, and the heat -conducting liquid in fixed link interior is transferred to the heat dissipation jar through convection and accelerates heat, and the fin of heat dissipation jar outside increases the contact area with air, and the overall heat dissipation efficiency is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of power component technology, and more specifically, it relates to high-current trench gate field cutoff IGBT power devices. Background Technology

[0002] High-current trench gate field-stop IGBT power devices, as core power execution units in power electronic systems, are widely used in high-power scenarios such as industrial motor drives, photovoltaic inverters, and UPS power supplies. In these applications, the devices need to withstand high rated current for extended periods while also bearing the significant heat generated by high-frequency switching. Their housing and associated structures, as the core connection between the device and the external system, must simultaneously meet four key requirements: installation stability, efficient heat dissipation, terminal anti-loosening, and ease of maintenance. These requirements directly determine the device's operational reliability and lifespan.

[0003] Current IGBT power devices still have the following shortcomings: Existing structures mostly rely on passive heat dissipation from the casing to the external heat sink. As the core of current transmission, the Joule heat generated during operation is difficult to dissipate quickly, and local hot spots are easily formed at the contact point between the terminal and the mounting base. At the same time, the lack of liquid convection-assisted heat conduction limits the heat transfer efficiency. Long-term operation can easily lead to device parameter drift and shortened lifespan. Moreover, it is difficult to perform quick maintenance and repair, and disassembly is difficult. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a high-current trench gate field-stop IGBT power device. This addresses the issues raised in the background section, where existing structures rely heavily on passive heat dissipation from the housing to an external heat sink. The main terminals, as the core of current transmission, struggle to quickly dissipate the Joule heat generated during operation, easily forming localized hot spots at the contact point between the terminals and the mounting base. Furthermore, the lack of liquid convection-assisted heat conduction limits heat transfer efficiency, leading to device parameter drift and shortened lifespan over long-term operation. Additionally, rapid maintenance and repair are difficult, and disassembly is challenging.

[0005] The purpose and effectiveness of this novel high-current trench gate field-stop IGBT power device are achieved through the following specific technical means: A high-current trench gate field-stop IGBT power device includes: a housing; the housing adopts a rectangular block structure, and a rectangular groove structure is provided in the middle of the top of the housing, and four sets of rectangular groove structures are provided in a rectangular array around the top of the housing, and four sets of through-hole structures are provided in a rectangular array around the top of the housing; a hollow cylindrical fixing rod is fixedly installed in the rectangular groove around the top of the housing, and the fixing rod is made of copper material with good thermal conductivity. A spring is sleeved on the outside of the fixing rod, and the outer end of the fixing rod extends to the outer wall of the housing. The inside of the fixing rod is filled with thermally conductive liquid; an L-shaped limiting block structure is slidably installed on the outside of the fixing rod, and the top of the limiting block has an inclined structure. The limiting block is slidably installed in the rectangular groove on the top of the housing, and the limiting block is made of copper material.

[0006] Furthermore, a rectangular plate structure mounting base is installed in the rectangular groove in the middle of the top of the housing, and the size of the mounting base matches the size of the rectangular groove on the top of the housing; three sets of rectangular plate structure main terminals are fixedly arranged on the top of the mounting base, and the outer surface of each set of main terminals is in contact with the inner side of the top of each set of limiting blocks; two sets of auxiliary terminals are fixedly arranged on one side of the top of the housing.

[0007] Furthermore, each of the fixed rods is fixedly connected to a set of cylindrical heat dissipation tanks at its outer end, and the heat dissipation tanks are filled with heat-conducting liquid. Heat dissipation fins are fixedly arranged in a ring array on the outer side of the heat dissipation tanks.

[0008] Furthermore, a set of mounting bolts is rotatably connected in the circular through grooves around the top of the housing, and the outer side of the mounting bolts is provided with a wedge-shaped groove structure in a ring array.

[0009] Furthermore, the top perimeter of the shell is fixedly arranged with U-shaped plate structures in a rectangular array, and one side of the fixed plate has a through circular groove structure; a cylindrical slide rod is slidably arranged in the circular groove on one side of the fixed plate, and a spring is sleeved on the outside of the slide rod; a wedge-shaped block is fixedly arranged at one end of the slide rod.

[0010] Compared with the prior art, the present invention has the following beneficial effects: A multi-path heat dissipation system is constructed, consisting of "main terminal → limiting block → fixing rod → thermally conductive liquid → heat sink → heat dissipation fins". The heat from the main terminal is efficiently transferred through the copper limiting block and fixing rod. The thermally conductive liquid inside the fixing rod accelerates the transfer of heat to the heat sink through convection. The fins on the outside of the heat sink increase the contact area with the air. Compared with the traditional single heat dissipation path, the overall heat dissipation efficiency is greatly improved. The fixing rod and heat sink are made of the same copper material, avoiding electrochemical corrosion of dissimilar metals, extending the service life of the heat dissipation system, effectively suppressing the generation of local hot spots, and ensuring the long-term stable operating parameters of the device.

[0011] With the help of the inclined guide on the top of the limiting block and the spring pre-tightening structure on the outside of the fixing rod, the mounting base can quickly slide into the groove of the housing along the inclined surface. The spring pushes the limiting block to form a pre-tightening limit on the mounting base from all sides, achieving a stable fixation without the need for repeated bolt adjustments. When disassembling, the mounting base can be removed simply by pushing the limiting block outward, greatly improving installation and maintenance efficiency. At the same time, the pre-tightening limit can effectively prevent the mounting base from shifting due to vibration, ensuring accurate connection between the main terminal and the external line and reducing contact resistance fluctuations.

[0012] By using the cooperation of the fixing plate, sliding rod, locking block and the wedge-shaped groove of the mounting bolt, when the bolt is tightened, the locking block is embedded in the wedge-shaped groove under the action of spring preload. The reverse locking force of the wedge-shaped surface restricts the bolt from rotating counterclockwise, avoiding the displacement of the device and the increase of contact thermal resistance caused by the loose bolt, and ensuring a stable connection between the device and the external equipment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall axial view structure of this utility model.

[0014] Figure 2 This is a top view schematic diagram of the overall structure of this utility model.

[0015] Figure 3 This is a cross-sectional view of the shell structure of this utility model.

[0016] Figure 4 This is a schematic diagram of the disassembled structure of the fixing rod and limiting block of this utility model.

[0017] Figure 5 This is a schematic diagram of the disassembled structure of the mounting bolts and locking blocks of this utility model.

[0018] In the diagram, the correspondence between component names and drawing numbers is as follows: 1. Housing; 101. Mounting base; 102. Main terminal; 103. Auxiliary terminal; 104. Fixing rod; 105. Limiting block; 106. Heat sink; 107. Mounting bolt; 108. Fixing plate; 109. Slide rod; 110. Locking block. Detailed Implementation

[0019] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0020] Example 1: As shown in the attached document Figure 1 To be continued Figure 5 As shown: This utility model provides a high-current trench gate field-stop IGBT power device, comprising: a housing 1; the housing 1 adopts a rectangular block structure, and a rectangular groove structure is opened in the middle of the top of the housing 1, and four sets of rectangular groove structures are opened in a rectangular array around the top of the housing 1, and four sets of through-hole structures are opened in a rectangular array around the top of the housing 1. The mounting holes are used to fix the entire device to an external device to achieve a stable connection between the device and the external system; a fixing rod 104 with a hollow cylindrical structure is fixedly installed in the rectangular groove around the top of the housing 1, and the fixing rod 104 is made of copper material with good thermal conductivity. A spring is sleeved on the outside of the fixing rod 104, and the spring provides elastic preload to the limiting block 105 to ensure that the limiting block 105 is in contact with the main end. The two rods 102 are in close contact, and the outer end of the fixing rod 104 extends to the outer wall of the housing 1. The interior of the fixing rod 104 is filled with a heat-conducting liquid, which can further improve the heat transfer efficiency of the fixing rod 104. The heat is transferred from the interior of the fixing rod 104 to the outer heat sink 106 through liquid convection. An L-shaped block 105 is slidably arranged on the outer side of the fixing rod 104. The top of the block 105 has a sloping structure. The block 105 is slidably arranged in a rectangular groove on the top of the housing 1. The block 105 is made of copper. The sloping structure on the top of the block 105 plays a guiding role during the installation of the mounting base 101, which facilitates the smooth contact between the mounting base 101 and the block 105 and reduces the installation resistance.

[0021] The housing 1 has a rectangular plate mounting base 101 installed in the rectangular groove in the middle of the top of the housing 1, and the size of the mounting base 101 matches the size of the rectangular groove at the top of the housing 1. Three sets of rectangular plate main terminals 102 are fixedly arranged on the top of the mounting base 101, which correspond to the collector, emitter and gate of the IGBT respectively, to realize the current transmission between the device and the external circuit. The outer surface of each set of main terminals 102 is in contact with the inner side of the top of each set of limiting blocks 105. Two sets of auxiliary terminals 103 are fixedly arranged on one side of the top of the housing 1. The auxiliary terminals 103 are mainly used to transmit auxiliary signals, such as the temperature detection signal of the IGBT and the fault alarm signal, to realize real-time monitoring and feedback of the device's operating status.

[0022] Each of the fixed rods 104 has a cylindrical heat sink 106 fixedly connected to its outer end. The heat sink 106 is filled with a heat-conducting liquid. The outer side of the heat sink 106 is fixedly arranged with heat dissipation fins in a ring array. The heat sink 106 is made of copper, the same material as the fixed rods 104, to avoid electrochemical corrosion caused by contact between dissimilar metals and to ensure efficient heat transfer. The heat dissipation fins are fixedly arranged in a ring array on the outer side of the heat sink 106. The heat dissipation fins are made of a lightweight metal material with good thermal conductivity. By increasing the contact area with air, the heat dissipation of the heat-conducting liquid in the heat sink 106 is accelerated, achieving efficient heat dissipation from the inside of the device.

[0023] Among them, a set of mounting bolts 107 are rotatably connected in the circular through grooves around the top of the housing 1, and the outer side of the mounting bolts 107 is provided with a wedge-shaped groove structure in a ring array.

[0024] The specific usage and function of this embodiment are as follows: During installation, the mounting base 101 is installed into the rectangular groove in the middle of the top of the housing 1. During installation, the outer surface of the mounting base 101 slides along the inclined surface of the top of the limiting block 105, pressing the limiting block 105 to move outward along the fixing rod 104. At this time, the spring on the outer side of the fixing rod 104 is compressed. After the mounting base 101 is installed into the rectangular groove in the middle of the top of the housing 1, the spring returns to its original position, pushing the limiting block 105 inward, so that the inner sides of the four sets of limiting blocks 105 are tightly fitted with the outer surfaces of the mounting base 101, providing pre-tightening and limiting the mounting base 101 from all sides, realizing the quick fixing of the mounting base 101. Disassembly is performed by reversing the installation steps, which is convenient. Disassembly improves maintenance efficiency; during use, the heat generated by the main terminal 102 is mainly conducted to the outside through the limiting block 105, improving the overall heat dissipation efficiency of the device. The main terminal 102 is in close contact with the limiting block 105, and the heat is transferred to the limiting block 105. The limiting block 105 then transfers the heat to the fixing rod 104. The heat-conducting liquid inside the fixing rod 104 transfers the heat to the heat dissipation tank 106 through convection. The heat dissipation fins on the outside of the heat dissipation tank 106 increase the contact area with the air, dissipating the heat into the air and completing the entire heat dissipation process. This improves the overall heat dissipation efficiency and effect of the equipment, thereby helping to extend the service life of the equipment.

[0025] Example 2: Based on Example 1, as shown in the appendix Figure 1 To be continued Figure 5 As shown: The top of the housing 1 is fixed with U-shaped plate structure fixing plates 108 arranged in a rectangular array around its four sides, and a through circular groove structure is opened on one side of the fixing plate 108; a cylindrical slide rod 109 is slidably arranged in the circular groove on one side of the fixing plate 108, and a spring is sleeved on the outside of the slide rod 109; a wedge-shaped block 110 is fixedly arranged at one end of the slide rod 109; when the mounting bolt 107 is tightened to the target position, the block 110 is embedded in the wedge-shaped groove under the pre-tightening force of the spring on the outside of the slide rod 109, which restricts the reverse rotation of the mounting bolt 107, thereby realizing the anti-loosening locking of the bolt.

[0026] The specific usage and function of this embodiment are as follows: In this invention, when the device is installed on an external device, the mounting bolt 107 is passed through the mounting hole of the housing 1 and aligned with the threaded hole of the external device, then rotated clockwise to tighten. During the tightening process, the edge of the wedge-shaped groove on the outer side of the mounting bolt 107 presses against the wedge-shaped surface of the locking block 110, pushing the locking block 110 to drive the slide rod 109 to slide outward along the through groove of the fixing plate 108, and the spring on the outer side of the slide rod 109 is compressed. When the mounting bolt 107 is tightened to the target torque position, the locking block 110 is embedded in the nearest wedge-shaped groove under the action of the spring preload. At this time, the wedge-shaped surface of the locking block 110 is in close contact with the wedge-shaped surface of the bolt groove, restricting the counterclockwise rotation of the mounting bolt 107, thereby achieving bolt anti-loosening locking, avoiding long-term vibration causing bolt loosening, and ensuring a stable connection between the device and the external device.

Claims

1. A high-current trench gate field-stop IGBT power device, characterized in that, include: The shell (1) adopts a rectangular block structure, and a rectangular groove structure is provided in the middle of the top of the shell (1). Four sets of rectangular groove structures are provided in a rectangular array around the top of the shell (1). Four sets of through-hole structures are provided in a rectangular array around the top of the shell (1). A fixed rod (104) with a hollow cylindrical structure is fixedly installed in the rectangular groove around the top of the shell (1). The fixed rod (104) is made of copper material with good thermal conductivity. A spring is sleeved on the outside of the fixed rod (104). The outer end of the fixed rod (104) extends to the outer wall of the shell (1). The inside of the fixed rod (104) is filled with thermally conductive liquid. An L-shaped block (105) is slidably installed on the outside of the fixed rod (104). The top of the block (105) has a sloping structure. The block (105) is slidably installed in the rectangular groove at the top of the shell (1). The block (105) is made of copper material.

2. The high-current trench gate field-stop IGBT power device as described in claim 1, characterized in that: A rectangular plate structure mounting base (101) is installed in the rectangular groove in the middle of the top of the housing (1), and the size of the mounting base (101) matches the size of the rectangular groove at the top of the housing (1).

3. The high-current trench gate field-stop IGBT power device as described in claim 2, characterized in that: The top of the mounting base (101) is fixedly provided with three sets of rectangular plate structure main terminals (102), and the outer surface of each set of main terminals (102) is in contact with the inner side of the top of each set of limiting blocks (105); two sets of auxiliary terminals (103) are fixedly provided on one side of the top of the housing (1).

4. The high-current trench gate field-stop IGBT power device as described in claim 1, characterized in that: Each set of fixed rods (104) has a set of cylindrical heat dissipation tanks (106) fixedly connected to the outer end of each set of fixed rods (104). The heat dissipation tanks (106) are filled with heat-conducting liquid, and the heat dissipation tanks (106) are fixedly arranged with heat dissipation fins in a ring array on the outer side.

5. The high-current trench gate field-stop IGBT power device as described in claim 1, characterized in that: A set of mounting bolts (107) are rotatably connected in the circular through slots around the top of the housing (1), and the outer side of the mounting bolts (107) is provided with a wedge-shaped groove structure in a ring array.

6. The high-current trench gate field-stop IGBT power device as described in claim 1, characterized in that: The top four sides of the housing (1) are fixed with U-shaped plate structures of fixed plates (108) in a rectangular array, and a through circular groove structure is opened on one side of the fixed plate (108).

7. The high-current trench gate field-stop IGBT power device as described in claim 6, characterized in that: A cylindrical slide rod (109) is slidably disposed in a circular through groove on one side of the fixed plate (108), and a spring is sleeved on the outside of the slide rod (109); a wedge-shaped block (110) is fixedly disposed at one end of the slide rod (109).

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