IGBT package quality detection device

Abstract

This invention relates to the field of pressure testing technology and discloses an IGBT housing quality testing device. It includes a base for placing the housing to be tested, and further includes: a pressure plate, horizontally positioned above the base and movable up and down above the base for pressure testing of the housing; and a heating plate, horizontally positioned on the base and below the pressure plate, used to heat the housing after normal temperature testing. This allows for pressure testing of the housing in both hot and cold states, realistically simulating the pressure scenario when the IGBT housing is heated during use and not heated when not in use. This invention can perform pressure quality testing on IGBT housings and can simultaneously test both the working and non-working states of the IGBT, avoiding inaccurate results caused by testing only the housing, thus improving the effectiveness of the device.

Description

Technical Field

[0001] This invention relates to the field of quality pressure testing technology, and in particular to an IGBT housing quality testing device. Background Technology

[0002] The IGBT housing is an important component in power electronic equipment. It is installed on top of the IGBT module and works with the IGBT bottom cover to protect the IGBT. The IGBT housing is used to protect the IGBT module from damage by the external environment. IGBT housings are usually made of materials such as copper.

[0003] Current IGBT casing quality inspection equipment, while capable of inspecting the IGBT casing, only has a single inspection function and cannot perform inspections simultaneously when the IGBT is in working or non-working states, thus reducing its effectiveness. Therefore, there is an urgent need to design a new IGBT casing quality inspection device. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art by proposing an IGBT casing quality testing device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An IGBT housing quality inspection device includes a base for placing the housing to be tested, and further includes: The pressure plate is horizontally positioned above the base and can move up and down above the base to test the pressure on the housing. The heating plate is horizontally set on the base and located below the pressure plate. The heating plate is used to heat the shell after normal temperature detection, so as to realize the pressure detection of the shell in both hot and cold states, which truly simulates the pressure scenario when the IGBT shell is heated during use and not heated when it is not in use. There are two simulation components, which are symmetrically arranged on both sides of the bottom of the pressure plate. The simulation components are used to simulate the scenario of the housing vibrating after being heated when the IGBT is in use.

[0006] As a further technical solution of the present invention, a placement platform is horizontally fixedly installed at the center of the top of the base, and a heating plate is fixedly installed at the center of the top of the placement platform. The placement platform is used to support the heating plate and the IGBT shell, ensuring that the testing of the IGBT shell can be carried out stably.

[0007] As a further technical solution of the present invention, a U-shaped frame is vertically fixedly installed on the top of the base, and two symmetrically arranged electric telescopic rods are vertically installed on the top of the U-shaped frame. The U-shaped frame is used to limit and support the electric telescopic rods and their connecting parts.

[0008] As a further technical solution of the present invention, a connecting plate is horizontally arranged below the horizontal side of the U-shaped frame. The telescopic ends of the two electric telescopic rods are fixedly installed on the top of the connecting plate. The connecting plate is located above the pressure plate. Four vertically arranged first spring rods are evenly distributed in a rectangle at the bottom of the connecting plate. The telescopic ends of the four first spring rods are fixedly installed on the top of the pressure plate. The first spring rods are used to connect the pressure plate, so that the pressure plate can move together with the connecting plate to realize the pressure detection of the pressure plate on the outer shell.

[0009] As a further technical solution of the present invention, a first copper block is fixedly installed on one side of the pressure plate, and a first copper plate is vertically fixedly installed on one side of the placement platform. The first copper block and the first copper plate are located in the same plane and are staggered so that when the first copper block and the first copper plate are in contact, the movement of the first copper block in the vertical direction will not be affected. In addition, when the first copper block and the first copper plate are in contact, the electrical appliances connected to them can work.

[0010] As a further technical solution of the present invention, an alarm is installed on the top of the horizontal side of the U-shaped frame, and the alarm is electrically connected to both the first copper block and the first copper plate, so that the alarm will be activated when the first copper block and the first copper plate come into contact, prompting the staff that the inspection of the casing is unqualified.

[0011] As a further technical solution of the present invention, two symmetrically arranged second copper plates are vertically fixedly installed at the bottom of the horizontal side of the connecting plate. The two second copper plates are electrically connected and equipped with a power supply. Second copper blocks are fixedly installed on the opposite sides of the placement platform. The two second copper blocks are electrically connected to the two second copper plates respectively, and the two second copper blocks are also electrically connected to the heating plate. This is used to ensure that after the connecting plate reaches the designated position, the pressure test of the shell at normal temperature has been completed, and then the heating plate is automatically activated to simulate the pressure scenario when the shell is heated during IGBT operation.

[0012] As a further technical solution of the present invention, the simulation component includes: a mounting block, which is fixedly installed on the bottom of the pressure plate, and a cylinder is horizontally fixedly sleeved on the mounting block, with the end of the cylinder flush with the mounting block, the top of the cylinder being open, and the cylinder being made of a heat-conducting material to ensure that the cylinder can conduct the internal temperature when the outer shell is heated.

[0013] As a further technical solution of the present invention, a piston disc is slidably installed inside the cylinder, and a gas with a high coefficient of thermal expansion is filled between the piston disc and the end of the cylinder, so that the gas can push the piston disc to move after being heated between the piston disc and the end of the cylinder. A second spring rod is fixedly installed at the end of the cylinder. The fixed end and the telescopic end of the second spring rod are connected by a spline sliding rod. The telescopic end of the second spring rod is fixedly installed at the center of the piston disc end face, so as to ensure that the piston disc will only slide and not rotate.

[0014] As a further technical solution of the present invention, L-shaped plates are horizontally fixedly installed at both ends of the cylinder surface. A torsion shaft is installed at the end of the horizontal side of each L-shaped plate, and a bending rod is installed at the other end of the torsion shaft. An impact ball is fixedly installed at the end of the bending rod. The top of the bending rod is conical. The impact ball is used to impact the heated shell to make it vibrate, which is used to realistically simulate the vibration scenario when the IGBT is working. A crossbar is horizontally fixedly installed on the outer end face of the piston disc, and multiple T-shaped columns are fixedly fixed on the top of the surface of the crossbar in a straight line. When the horizontal side of the T-shaped column contacts the top of the bending rod, the horizontal side of the T-shaped column and the top of the bending rod slide between them.

[0015] The beneficial effects of this invention are as follows: This invention can perform pressure quality testing on IGBT housings and can simultaneously test IGBTs in both working and non-working states, avoiding inaccurate test results caused by only testing the housing, thereby improving the effectiveness of the equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an IGBT housing quality testing device proposed in this invention; Figure 2 for Figure 1 An enlarged schematic diagram of part A in the middle; Figure 3 This is a schematic cross-sectional view of the U-shaped frame structure of an IGBT housing quality inspection device proposed in this invention; Figure 4 This is a schematic diagram of the structure of an IGBT housing quality inspection device after the housing has been removed, as proposed in this invention. Figure 5 This is a schematic cross-sectional view of the cylindrical structure of an IGBT housing quality inspection device proposed in this invention; Figure 6 This is a schematic diagram of the internal structure of the cylinder of an IGBT housing quality testing device proposed in this invention; Figure 7 This is a schematic diagram of the crossbar and T-shaped column structure of an IGBT housing quality inspection device proposed in this invention.

[0017] In the diagram: 1. Base; 2. U-shaped frame; 3. Electric telescopic rod; 4. Alarm; 5. Connecting plate; 6. First spring rod; 7. Pressure plate; 8. First copper block; 9. First copper plate; 10. Placement platform; 11. Mounting block; 12. Cylinder; 13. Folding rod; 14. Impact ball; 15. L-shaped plate; 16. Torsion shaft; 17. Second copper block; 18. Second copper plate; 19. Heating plate; 20. Piston disc; 21. Second spring rod; 22. Crossbar; 23. T-shaped column. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0019] 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.

[0020] Please see the appendix Figure 1 - Appendix Figure 7 An IGBT housing quality testing device includes a base 1 for placing the housing to be tested, and further includes a pressure plate 7, a heating plate 19, and simulation components. The pressure plate 7 is horizontally positioned above the base 1 and can move up and down above the base 1 to perform pressure testing on the housing. The heating plate 19 is horizontally positioned on the base 1 and located below the pressure plate 7. The heating plate 19 is used to heat the housing after normal temperature testing, so as to realize the pressure testing of the housing in both hot and cold states, realistically simulating the pressure scenario when the IGBT housing heats up during use and does not heat up when not in use. There are two simulation components, which are symmetrically arranged on both sides of the bottom of the pressure plate 7. The simulation components are used to simulate the scenario of the housing vibrating after being heated during IGBT use.

[0021] Please see the appendix Figure 1 - Appendix Figure 7 In a preferred embodiment, a placement platform 10 is horizontally fixedly installed at the top center of the base 1, and a heating plate 19 is fixedly installed at the top center of the placement platform 10. The placement platform 10 is used to support the heating plate 19 and the IGBT housing, ensuring that the testing of the IGBT housing can be carried out stably.

[0022] Please see the appendix Figure 1 - Appendix Figure 7 In a preferred embodiment, a U-shaped frame 2 is vertically fixedly installed on the top of the base 1, and two symmetrically arranged electric telescopic rods 3 are vertically installed on the top of the U-shaped frame 2. The U-shaped frame 2 is used to limit and support the electric telescopic rods 3 and their connecting parts.

[0023] Please see the appendix Figure 1 - Appendix Figure 7In a preferred embodiment, a connecting plate 5 is horizontally arranged below the transverse side of the U-shaped frame 2. The telescopic ends of the two electric telescopic rods 3 are fixedly installed on the top of the connecting plate 5. The connecting plate 5 is located above the pressure plate 7. Four vertically arranged first spring rods 6 are evenly distributed in a rectangle at the bottom of the connecting plate 5. The telescopic ends of the four first spring rods 6 are fixedly installed on the top of the pressure plate 7. The first spring rods 6 are used to connect the pressure plate 7, so that the pressure plate 7 can move together with the connecting plate 5 to realize the pressure detection of the outer shell by the pressure plate 7.

[0024] Please see the appendix Figure 1 - Appendix Figure 7 In a preferred embodiment, a first copper block 8 is fixedly installed on one side of the pressure plate 7, and a first copper plate 9 is vertically fixedly installed on one side of the placement platform 10. The first copper block 8 and the first copper plate 9 are located in the same plane and are staggered so that when the first copper block 8 and the first copper plate 9 are in contact, the movement of the first copper block 8 in the vertical direction will not be affected. In addition, when the first copper block 8 and the first copper plate 9 are in contact, the electrical appliances connected to them can work.

[0025] Please see the appendix Figure 1 - Appendix Figure 7 In a preferred embodiment, an alarm 4 is installed on the top of the horizontal side of the U-shaped frame 2, and the alarm 4 is electrically connected to both the first copper block 8 and the first copper plate 9, so that the alarm 4 will activate when the first copper block 8 and the first copper plate 9 come into contact, prompting the staff that the inspection of the casing is unqualified.

[0026] Please see the appendix Figure 1 - Appendix Figure 7 In a preferred embodiment, two symmetrically arranged second copper plates 18 are vertically fixedly installed on the bottom of the horizontal side of the connecting plate 5. The two second copper plates 18 are electrically connected and equipped with a power supply. Second copper blocks 17 are fixedly installed on the opposite sides of the placement platform 10. The two second copper blocks 17 are electrically connected to the two second copper plates 18 respectively, and the two second copper blocks 17 are also electrically connected to the heating plate 19. This is used to ensure that after the connecting plate 5 reaches the designated position, the pressure test of the shell at normal temperature has been completed, and then the heating plate 19 is automatically activated to simulate the pressure scenario when the shell is heated during IGBT operation.

[0027] Please see the appendix Figure 1 - Appendix Figure 7 In a preferred embodiment, the simulation component includes: a mounting block 11, which is fixedly mounted on the bottom of the pressure plate 7. A cylinder 12 is horizontally fixedly sleeved on the mounting block 11, and the end of the cylinder 12 is flush with the mounting block 11. The top of the cylinder 12 is open, and the cylinder 12 is made of a heat-conducting material to ensure that the cylinder 12 can conduct the internal temperature when the outer shell is heated.

[0028] Please see the appendix Figure 1 - Appendix Figure 7 In a preferred embodiment, a piston disc 20 is slidably mounted inside the cylinder 12, and a gas with a high coefficient of thermal expansion is filled between the piston disc 20 and the end of the cylinder 12, so that the gas can push the piston disc 20 to move after being heated between the piston disc 20 and the end of the cylinder 12. A second spring rod 21 is fixedly mounted inside the end of the cylinder 12. The fixed end and the telescopic end of the second spring rod 21 are connected by a spline sliding rod. The telescopic end of the second spring rod 21 is fixedly mounted at the center of the end face of the piston disc 20, so as to ensure that the piston disc 20 will only slide and not rotate.

[0029] Please see the appendix Figure 1 - Appendix Figure 7 In a preferred embodiment, L-shaped plates 15 are horizontally fixedly installed at both ends of the surface of the cylinder 12. A torsion shaft 16 is installed at the end of the horizontal side of each L-shaped plate 15. A folding rod 13 is installed at the other end of the torsion shaft 16. An impact ball 14 is fixedly installed at the end of the folding rod 13. The top of the folding rod 13 is conical. The impact ball 14 is used to impact the heated shell to make it vibrate, which is used to realistically simulate the vibration scenario when the IGBT is working. A crossbar 22 is horizontally fixedly installed on the outer end face of the piston disc 20. A plurality of T-shaped columns 23 are fixedly fixed on the top of the surface of the crossbar 22 in a straight line. When the horizontal side of the T-shaped column 23 contacts the top of the folding rod 13, the horizontal side of the T-shaped column 23 slides between the horizontal side of the T-shaped column 23 and the top of the folding rod 13.

[0030] When performing pressure quality testing on the IGBT housing, place the housing on the placement platform 10 and position the heating plate 19 inside the housing; When the electric telescopic rod 3 is activated, the connecting plate 5 moves downward. The connecting plate 5 moves downward, which in turn drives the pressure plate 7 to move downward via the first spring rod 6. The first spring rod 6 has two states: First, when the pressure plate 7 is not in contact with the outer shell, the first spring rod 6 is in its natural state. Second, after the pressure plate 7 contacts the outer shell, the connecting plate 5 continues to move downward, but at this time the spring rod will not drive the pressure plate 7 to move downward. At this time, the second spring rod 21 is compressed and generates elastic force. In addition, the downward movement of the connecting plate 5 will also drive the second copper plate 18 and the first copper block 8 to move downward. When the second copper plate 18 and the second copper block 17 come into contact, the electric telescopic rod 3 stops working. At this time, the second spring rod 21 is compressed to the maximum value, which simulates the pressure detection of the casing at normal temperature when the IGBT is not in working state. When the second copper plate 18 and the second copper block 17 come into contact, the heating plate 19 heats the inside of the shell, simulating the heat generation state of the IGBT. During this period, the pressure plate 7 is always under pressure on the shell to simulate the actual heat generation state of the IGBT from non-working to working, thereby improving the detection authenticity and accuracy of the device. When the outer shell is heated, the cylinder 12 conducts the heat of the outer shell and causes the gas with a high coefficient of thermal expansion inside to expand and push the piston disc 20 to move. The movement of the piston disc 20 drives the crossbar 22 to move and causes the second spring rod 21 to generate tension. The movement of the crossbar 22 drives the T-shaped column 23 to move. When the horizontal edge of the T-shaped column 23 contacts the top of the bending rod 13, the bending rod 13 will rotate around the torsion shaft 16. The rotation of the bending rod 13 drives the impact ball 14 to rotate and causes the torsion shaft 16 to generate torque. When the T-shaped column 23 passes the top of the bending rod 13, the torque generated by the torsion spring will cause the bending rod 13 to reset. The reset of the bending rod 13 will drive the impact ball 14 to reset. The reset of the impact ball 14 will impact the heated outer shell, causing the outer shell to vibrate, so as to simulate the vibration state when the IGBT is working. If the outer casing is of acceptable quality, the first copper block 8 and the first copper plate 9 will not come into contact, and the alarm light will not illuminate. If the outer casing is not up to standard, the first copper block 8 and the first copper plate 9 will come into contact, and the alarm light will illuminate. In summary, pressure quality testing can be performed on the IGBT housing, and testing can be performed simultaneously in both working and non-working states of the IGBT. This avoids inaccurate test results caused by only testing the housing, thus improving the effectiveness of the equipment.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An IGBT housing quality detection device, comprising a base (1) for placing a housing to be detected, characterized in that, Also includes: Pressure plate (7), the pressure plate (7) is horizontally arranged above the base (1), and the pressure plate (7) can move up and down above the base (1); Heating plate (19), the heating plate (19) is horizontally arranged on the base (1) and the heating plate (19) is located below the pressure plate (7). The heating plate (19) is used to heat the shell after normal temperature detection. The simulation components are two in number and are symmetrically arranged on both sides of the bottom of the pressure plate (7). The simulation components are used to simulate the scenario of the housing vibrating after being heated when the IGBT is in use. A placement platform (10) is horizontally fixed at the top center of the base (1), and a heating plate (19) is fixedly installed at the top center of the placement platform (10). A U-shaped frame (2) is vertically fixed at the top of the base (1), and two symmetrically arranged electric telescopic rods (3) are vertically installed at the top of the U-shaped frame (2). A connecting plate (5) is horizontally arranged below the horizontal side of the U-shaped frame (2), and the telescopic ends of the two electric telescopic rods (3) are fixedly installed on the top of the connecting plate (5). The connecting plate (5) is located above the pressure plate (7), and the bottom of the horizontal side of the connecting plate (5) is vertically fixed. Two symmetrically arranged second copper plates (18) are fixedly installed and electrically connected. Two copper blocks (17) are fixedly installed on opposite sides of the placement platform (10). The two copper blocks (17) are electrically connected to the two second copper plates (18) respectively, and the two copper blocks (17) are also electrically connected to the heating plate (19). This is used to make the connecting plate (5) reach the designated position. At this time, the pressure test of the shell under normal temperature has been completed. Then the heating plate (19) is automatically started to simulate the pressure scenario when the shell is heated during IGBT operation.

2. The IGBT housing quality inspection apparatus according to claim 1, wherein The bottom of the connecting plate (5) has four vertically arranged first spring rods (6) evenly distributed in a rectangular shape, and the telescopic ends of the four first spring rods (6) are fixedly installed on the top of the pressure plate (7).

3. The IGBT housing quality inspection apparatus according to claim 2, characterized by The pressure plate (7) is fixedly installed on one side with a first copper block (8) and the placement platform (10) is vertically fixedly installed on one side with a first copper plate (9). The first copper block (8) and the first copper plate (9) are located in the same plane and are staggered.

4. The IGBT housing quality inspection apparatus according to claim 3, wherein An alarm (4) is installed on the top of the horizontal side of the U-shaped frame (2), and the alarm (4) is electrically connected to the first copper block (8) and the first copper plate (9).

5. The IGBT housing quality inspection apparatus according to claim 4, wherein The simulation component includes: a mounting block (11), which is fixedly installed on the bottom of the pressure plate (7). A cylinder (12) is horizontally fixedly sleeved on the mounting block (11), and the end of the cylinder (12) is flush with the mounting block (11). The top of the cylinder (12) is open, and the cylinder (12) is made of heat-conducting material.

6. The IGBT housing quality inspection apparatus according to claim 5, wherein A piston disc (20) is slidably installed inside the cylinder (12), and a gas with a high coefficient of thermal expansion is filled between the piston disc (20) and the end of the cylinder (12). A second spring rod (21) is fixedly installed at the end of the cylinder (12). The fixed end and the telescopic end of the second spring rod (21) are connected by a spline sliding rod. The telescopic end of the second spring rod (21) is fixedly installed at the center of the end face of the piston disc (20).

7. The IGBT housing quality inspection apparatus according to claim 6, wherein Both ends of the cylinder (12) are horizontally fixedly installed with L-shaped plates (15). Each L-shaped plate (15) is equipped with a torsion shaft (16) at the end of its horizontal side. The other end of the torsion shaft (16) is equipped with a folding rod (13). The end of the folding rod (13) is fixedly installed with an impact ball (14). The top of the folding rod (13) is conical. The outer end face of the piston disc (20) is horizontally fixedly installed with a crossbar (22). The top of the surface of the crossbar (22) is fixed with multiple T-shaped columns (23) that are evenly distributed in a straight line.

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