Semi-automatic test fixture suitable for IPM module test

Abstract

The invention discloses a semi-automatic test fixture suitable for IPM module test, which comprises a socket bottom center block, the top of the socket bottom center block is movably connected with a floating block, the floating block penetrates through a guide column and can float up and down along the guide column, and an acrylic pressure cover is arranged above the socket bottom center block. A first socket bottom side supporting block and a second socket bottom side supporting block are fixedly connected to the two sides of the socket bottom center block respectively, a pressing block is connected to the top of the acrylic pressing cover, a handle is fixedly connected to the side face of the acrylic pressing cover, a through hole facilitating movement of a spring needle is reserved in a grounding area of the floating block and the IPM module, and the through hole penetrates through the whole socket bottom center block to make contact with the bottommost PCB. According to the invention, the crimping stability and the test accuracy are improved, the device can be suitable for different IPM modules, the universality is high, the matched clamping jaw and the air cylinder do not need to be replaced in each test, the research and development cost is reduced, and the research and development period is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of semiconductor detection, and in particular to a semi-automatic test fixture suitable for IPM module testing. Background Art

[0002] Intelligent power module (IPM) is an advanced power switching device with the advantages of high current density, low saturation voltage and high voltage resistance of GTR (high power transistor), and high input impedance, high switching frequency and low driving power of MOSFET (field effect transistor). In addition, IPM integrates logic, control, detection and protection circuits, which is easy to use. It not only reduces the volume and development time of the system, but also greatly enhances the reliability of the system. It adapts to the development direction of today's power devices - modularization, composite and power integrated circuits (PIC), and has been more and more widely used in the fields of microelectronics and optoelectronics. The test of IPM modules is usually carried out by the cooperation of Handler (processor, manager) and cylinder. Due to the different specifications of IPM modules, the claws adapted to Handler (processor, manager) are divided into different models. When the IPM module of different specifications is replaced after the test, the matching claws and cylinders need to be replaced, and the cylinder stroke is not adjustable. To a certain extent, the known test fixture is only for a certain IPM module, and cannot be applied between multiple different IPM modules, thereby reducing the overall test efficiency. Therefore, it is urgent to develop a semi-automatic test fixture suitable for IPM module testing to solve the above technical problems.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] The purpose of the present invention is to provide a semi-automatic test fixture suitable for IPM module testing. During the test, the IPM module is placed on a PCB board. By closing the acrylic pressure cover, the IPM module can be reliably contacted with a test probe. By opening and closing the acrylic pressure cover, the contact test between the IPM module and the base plane can be realized, thereby improving the crimping stability and the test accuracy. The invention is also applicable to different IPM modules and has strong versatility. There is no need to replace the matching adapter claws and cylinders for each test, which is beneficial to reducing R&D costs and shortening the R&D cycle. The invention has broad application prospects and is beneficial to popularization and application.

[0005] In order to achieve the above-mentioned object, the present invention provides a semi-automatic test fixture suitable for IPM module testing, comprising a socket bottom center block, the top of the socket bottom center block is movably connected to a floating block through a plug screw, a second spring is sleeved on the bottom polished rod of the plug screw, a guide column is fixedly connected to the socket bottom center block, the floating block passes through the guide column and can float up and down along the guide column, contact fingers 1 and 2 are provided on both sides of the floating block, a spring clamping groove 1 for accommodating the second spring is provided on the top of the socket bottom center block, an acrylic pressure cover is provided above the socket bottom center block, a socket bottom side support block 1 and a socket bottom side support block 2 are respectively fixedly connected on both sides of the socket bottom center block, a lock and a hinge are respectively provided on the socket bottom side support block 1 and the socket bottom side support block 2, one side of the acrylic pressure cover is connected to the hinge, and the other side is clamped with the spring clip on the lock, a pressure block is connected to the top of the acrylic pressure cover, and a handle for controlling the opening and closing of the acrylic pressure cover is fixedly connected to the side, and a space for facilitating the movement of the spring pin is reserved between the floating block and the grounding area of ​​the IPM module A through hole, wherein the through hole penetrates the entire center block of the socket bottom and contacts the PCB board at the bottom, copper block 1 and copper block 2 are installed in the through hole with zero clearance, and the copper block 1 and copper block 2 fasten and lock the lower end of the spring pin, and the socket bottom side support block 1 and the socket bottom side support block 2 are symmetrically provided with ramp blocks, and the ramp blocks are tangent to the cam rod roller and roll along the ramp and are symmetrically distributed on both sides of the center block of the socket bottom, and the cam rod roller is slidably matched with a cam rod connecting block, and a connecting block is provided on the PCB board, and a connecting block slot is provided on the connecting block, The pressing block is pressed downward to press the IPM module into the limiting slot on the upper surface of the floating block. When the floating block is pressed downward, the spring pins fixed by the copper blocks 1 and 2 penetrate the floating block and contact and scratch the grounding area of ​​the IPM module. The sliding pin intersects the floating block, and the cam rod connecting block moves downward as the floating block floats as a whole, so that the contact fingers 1 and 2 on both sides are pressed inward to contact the IPM module pins to complete the contact. The tail ends of the contact fingers are inserted into the connecting block slots and fixed, and the height position is limited by the cooperation between the inner sides of the contact fingers and the center block of the bottom of the socket.

[0006] Preferably, the two sides of the socket bottom center block are respectively fixed with socket bottom side support block one and socket bottom side support block two by positioning pin one and screw two and screw three, and the socket bottom side support block one and socket bottom side support block two are seamlessly connected with the socket bottom center block to form a plane.

[0007] Preferably, a plurality of positioning pins 1 are provided on both sides of the center block of the socket bottom, and the socket bottom side support block 1 and the socket bottom side support block 2 are fixed on both sides of the center block of the socket bottom through positioning pin 1 and fixedly connected through screws 2 and 3.

[0008] Preferably, the top end of the spring clip is movably connected to the inside of the lock through a first positioning pin and a first spring, the first spring is accommodated in a spring slot 2 on the side of the spring clip, and the lock is fixed to a support block 1 on the bottom side of the socket.

[0009] Preferably, the hinge and the second positioning pin are loosely fitted on the acrylic pressure cover.

[0010] Preferably, the top of the acrylic pressure cover is connected to a pressure block via screw four, and the side is fixedly connected to a handle via screw five.

[0011] Preferably, the copper block 1 and the copper block 2 are fixedly locked to the lower end of the spring pin by means of a screw 1 and a positioning pin 2.

[0012] The present invention provides a semi-automatic test fixture suitable for IPM module testing, which has the following beneficial effects.

[0013] 1. The present invention places the IPM module on the PCB board during testing, and by closing the acrylic pressure cover, the IPM module can be reliably contacted with the test probe, thereby improving the crimping stability and test accuracy. The invention is applicable to different IPM modules, has strong versatility, and does not require replacement of matching adapter claws and cylinders for each test, which is beneficial to reducing R&D costs and shortening R&D cycles. It has broad application prospects and is conducive to popularization and application.

[0014] 2. The present invention can meet the withstand voltage test conditions of more than 3000V, as well as DC / AC and UIS tests of more than 100A. In terms of meeting the overall test requirements, it not only reduces the overall size of the product and the production difficulty, but also can realize the overall linkage test of the IPM module. It can be widely used in the field of microelectronics, optoelectronics, IGBT / MOSFET and other high-power power management devices and automotive-grade chips. The main performances include test adjustability, crimping stability and closed test. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional diagram of a semi-automatic test fixture suitable for IPM module testing provided by the present invention; Figure 2 A top view of a semi-automatic test fixture suitable for IPM module testing provided by the present invention; Figure 3 A partial exploded view of a semi-automatic test fixture suitable for IPM module testing provided by the present invention; Figure 4 A partial perspective view of a semi-automatic test fixture suitable for IPM module testing provided by the present invention; Figure 5 An overall exploded view of a semi-automatic test fixture suitable for IPM module testing provided by the present invention; Figure 6 A perspective view of a semi-automatic test fixture suitable for IPM module testing provided by the present invention in a working state; Figure 7 A cross-sectional view of a semi-automatic test fixture suitable for IPM module testing provided by the present invention in a working state.

[0016] In the figure: 1. Cam rod roller 2. Cam rod connecting block 3. Sliding pin 4. Ramp block 5. Floating block 6. Socket bottom center block 7. Socket bottom side support block 1 8. Socket bottom side support block 2 9. Hinge 10. Lock 11. Spring clip 12. Pressure block 13. Acrylic pressure cover 14. Copper block 1 15. Copper block 2 16. IPM module 17. PCB board 18. Connecting block 19. Contact finger 1 20. Contact finger 2 21. Guide column 22. Handle 23. First positioning pin 24. Second positioning pin 25. Plug screw 26. Limiting slot 27. Spring pin 28. First spring 29. Second spring 30. Through hole 31. Screw 1 32. Screw 2 33. Screw 3 34. Screw 4 35. Screw 5 36. Positioning pin 1 37. Positioning pin 2 38. Spring slot 1 39. Spring slot 2 40. Inside of contact finger 41. Connecting block slot DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with specific embodiments and drawings to help understand the content of the present invention.

[0018] like Figure 1-Figure 3 As shown in the figure, they are respectively a three-dimensional view, a top view and a partial exploded view of a semi-automatic test fixture suitable for IPM module testing provided by the present invention. Figure 4-Figure 5 As shown in FIG. 1 , there are respectively a partial perspective view and an overall exploded view of a semi-automatic test clamp suitable for IPM module testing provided by the present invention. Figure 6-Figure 7The figures shown are respectively a perspective view and a cross-sectional view of a semi-automatic test clamp suitable for IPM module testing provided by the present invention in a working state. The semi-automatic test fixture suitable for IPM module testing comprises a socket bottom center block 6, the top of the socket bottom center block 6 is movably connected to a floating block 5 via a plug screw 25, a second spring 29 is sleeved on the bottom bare rod of the plug screw 25, a guide column 21 is fixedly connected to the socket bottom center block 6, the floating block 5 passes through the guide column 21 and can float up and down along the guide column 21, contact fingers 19 and contact fingers 20 are provided on both sides of the floating block 5, a spring slot 38 for accommodating the second spring 29 is provided on the top of the socket bottom center block 6, and a second spring 29 is provided on the top of the socket bottom center block 6. The acrylic pressure cover 13, the two sides of the socket bottom center block 6 are respectively fixed with the socket bottom side support block 1 7 and the socket bottom side support block 2 8, the socket bottom side support block 1 7 and the socket bottom side support block 2 8 are respectively provided with a lock 10 and a hinge 9, one side of the acrylic pressure cover 13 is connected to the hinge 9, and the other side is clamped with the spring clip 11 on the lock 10, the top of the acrylic pressure cover 13 is connected with a pressure block 12, and the side is fixed with a handle 22 for controlling the opening and closing of the acrylic pressure cover 13, and the grounding area of ​​the floating block 5 and the IPM module 16 is reserved with a through hole 30 for facilitating the activity of the spring pin 27, and the through hole 30 The center block 6 that runs through the entire bottom of the socket contacts the PCB board 17 at the bottom. Copper block 14 and copper block 2 15 are installed with zero clearance in the through hole 30. The copper block 14 and copper block 2 15 fix the lower end of the spring pin 27. The bottom support block 1 7 and the bottom support block 2 8 of the socket are symmetrically provided with ramp blocks 4. The ramp blocks 4 are tangent to the cam rod roller 1 and roll symmetrically along the ramp on both sides of the bottom center block 6 of the socket. The cam rod roller 1 is slidably matched with a cam rod connecting block 2. A connecting block 18 is provided on the PCB board 17. A connecting block slot 41 is provided on the connecting block 18. The pressing block 1 2 presses down to press the IPM module 16 into the limit slot 26 on the upper surface of the floating block 5. When the floating block 5 is pressed down, the spring pin 27 fixed by the copper block 14 and the copper block 2 15 penetrates the floating block 5 and contacts and scrapes the grounding area of ​​the IPM module 16. The sliding pin 3 intersects the floating block 5. The cam rod connecting block 2 moves downward as the floating block 5 floats as a whole, and the contact fingers 1 19 and the contact fingers 2 20 on both sides press inward to contact the pins of the IPM module 16 to complete the contact. The tail end of the contact finger is inserted into the connecting block slot 41 and fixed. The height position is limited by the inner side 40 of the contact finger and the center block 6 of the socket bottom.

[0019] The two sides of the socket bottom center block 6 are respectively fixed with the socket bottom side support block 1 7 and the socket bottom side support block 2 8 through the positioning pin 1 36 and the screw 2 32 and the screw 3 33. The socket bottom side support block 1 7 and the socket bottom side support block 2 8 are connected with the socket bottom center block 6 without gap to form a plane. Both sides of the socket bottom center block 6 are provided with a plurality of positioning pins 1 36. The socket bottom side support block 1 7 and the socket bottom side support block 2 8 are fixed on both sides of the socket bottom center block 6 through the positioning pin 1 36 and are fixedly connected by the screw 2 32 and the screw 3 33. The top end of the spring clip 11 is movably connected to the inside of the lock buckle 10 through the first positioning pin 23 and the first spring 28. The first spring 28 is accommodated in the spring clamping groove 2 39 on the side of the spring clip 11. The lock buckle 10 is fixed to the socket bottom side support block 1 7. The hinge 9 and the second positioning pin 24 are loosely matched on the acrylic pressure cover 13. The top of the acrylic pressure cover 13 is connected to the pressure block 12 by screws 4 34, and the side is fixed with the handle 22 by screws 5 35. The copper block 14 and the copper block 2 15 are fixed to the lower end of the spring pin 27 by screws 1 31 and positioning pins 2 37.

[0020] The working principle of the present invention is: The present invention reduces the types of cylinders on the machine equipment to a certain extent. The design principle is to place the PCB board 17 and the connecting block 18 as auxiliary tools horizontally to ensure the test working environment of the IPM module 16, use the connecting block 18 for positioning, and then clamp the connecting block slot 41 with the tail end of the contact finger. When the staff closes the acrylic pressure cover 13, the pressing block 12 on the acrylic pressure cover 13 presses the IPM module downward to contact the center block 6 at the bottom of the socket. Due to the elastic cooperation between the center block 6 at the bottom of the socket and the floating block 5, the cam rod roller 1 moves downward along the ramp block 4 in a certain amount of tangential cooperation. The contact finger 1 19 and the contact finger 2 20 are compressed as required by the cam rod roller 1 that moves downward symmetrically, and then the pins of the IPM module 16 are contact tested.

[0021] The present invention places the IPM module 16 on the PCB board 17 during testing, and by closing the acrylic pressure cover 13, the IPM module 16 can be reliably contacted with the test probe, which improves the crimping stability and test accuracy, and can be applied to different IPM modules 16, with strong versatility. Each test does not require the replacement of matching adapter claws and cylinders, which is conducive to reducing R&D costs and shortening R&D cycles. The present invention can meet the withstand voltage test conditions of more than 3000V, and DC / AC and UIS tests of more than 100A. In terms of meeting the needs of the overall test, it not only reduces the overall size of the product and the difficulty of production, but also can realize the overall linkage test of the IPM module 16. It can be widely used in the field of automotive-grade chips for high-power power management devices such as microelectronics, optoelectronics, IGBT / MOSFET, etc. The main performances include test adjustability, crimping stability, and closed testing.

[0022] The invention concept is described in detail using specific examples herein, and the description of the above embodiments is only used to help understand the core idea of ​​the invention. It should be pointed out that any obvious modification, equivalent substitution or other improvement made by a person of ordinary skill in the art without departing from the invention concept should be included in the protection scope of the present invention.

Claims

1. A semi-automatic test fixture suitable for IPM module testing, characterized in that: The invention comprises a socket bottom center block, the top of the socket bottom center block is movably connected to a floating block by a plug screw, a second spring is sleeved on the bottom smooth rod of the plug screw, a guide column is fixedly connected to the socket bottom center block, the floating block passes through the guide column and can float up and down along the guide column, contact fingers 1 and 2 are provided on both sides of the floating block, a spring clamping groove 1 for accommodating the second spring is provided on the top of the socket bottom center block, an acrylic pressure cover is provided above the socket bottom center block, a socket bottom side support block 1 and a socket bottom side support block 2 are respectively fixedly connected on both sides of the socket bottom center block, a lock and a hinge are respectively provided on the socket bottom side support block 1 and the socket bottom side support block 2, one side of the acrylic pressure cover is connected to the hinge, and the other side is clamped with the spring clip on the lock, a pressure block is connected to the top of the acrylic pressure cover, and a handle for controlling the opening and closing of the acrylic pressure cover is fixedly connected to the side, a through hole for facilitating the movement of the spring pin is reserved in the grounding area of ​​the floating block and the IPM module, and the through hole runs through the entire socket bottom center The block contacts the PCB board at the bottom, and copper block 1 and copper block 2 are installed in the through hole with zero clearance. The copper block 1 and copper block 2 fix and lock the lower end of the spring pin. The socket bottom side support block 1 and socket bottom side support block 2 are symmetrically provided with ramp blocks. The ramp blocks are tangent to the cam rod roller and roll symmetrically along the ramp and are distributed on both sides of the socket bottom center block. The cam rod roller is slidably matched with a cam rod connecting block. A connecting block is provided on the PCB board, and a connecting block slot is provided on the connecting block. The pressing block is pressed downward to press the IPM module into the limit card slot on the upper surface of the floating block. When the floating block is pressed downward, the spring pin fixed by copper block 1 and copper block 2 penetrates the floating block and contacts the grounding area of ​​the IPM module and scratches it. The sliding pin intersects the floating block. The cam rod connecting block moves downward as the floating block floats as a whole, and presses the contact fingers 1 and 2 on both sides inward to contact the IPM module pins to complete the contact. The tail end of the contact finger is inserted into the connecting block slot and fixed, and the height position is limited by the inner side of the contact finger and the center block of the socket bottom.

2. A semi-automatic test fixture suitable for IPM module testing according to claim 1, characterized in that: The two sides of the socket bottom center block are respectively fixed with a socket bottom side support block 1 and a socket bottom side support block 2 by means of a positioning pin 1 and screws 2 and 3. The socket bottom side support block 1 and the socket bottom side support block 2 are seamlessly connected with the socket bottom center block to form a plane.

3. A semi-automatic test fixture suitable for IPM module testing according to claim 2, characterized in that: A plurality of positioning pins 1 are provided on both sides of the socket bottom center block, and the socket bottom side support block 1 and the socket bottom side support block 2 are fixed on both sides of the socket bottom center block through the positioning pin 1 and fixedly connected through the screw 2 and the screw 3.

4. A semi-automatic test fixture suitable for IPM module testing according to claim 3, characterized in that: The top end of the spring clip is movably connected to the inside of the lock through a first positioning pin and a first spring, the first spring is accommodated in a second spring clamping groove on the side of the spring clip, and the lock is fixed to a first support block on the bottom side of the socket.

5. A semi-automatic test fixture suitable for IPM module testing according to claim 4, characterized in that: The hinge and the second positioning pin are loosely matched on the acrylic pressure cover.

6. A semi-automatic test fixture suitable for IPM module testing according to claim 5, characterized in that: The top of the acrylic pressure cover is connected to a pressure block via screw four, and the side is fixedly connected to a handle via screw five.

7. A semi-automatic test fixture suitable for IPM module testing according to claim 6, characterized in that: The copper block 1 and the copper block 2 are fixedly locked to the lower end of the spring pin by means of a screw 1 and a positioning pin 2.

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