Packaging module test fixture

Abstract

The utility model relates to a package module test fixture, include: base, carrier, set up on the base, the first recess is seted up in the upper end, the first recess bottom exposes the conductive plate, and the conductive plate connects the one of the pole of power supply, package module, is connected in the first recess, and the upper end has four terminals, and the lower end has the metal bottom plate, and the metal bottom plate and the electric contact of conductive plate, support, set up on the upper end of base, and be located the rear end of carrier, lifting mechanism, set up in the upper side of support front end, test board, connect the output end of lifting mechanism lower extreme, and four groups of probe groups are set up through on test board, and the other pole of probe group connection power supply, and the probe group position corresponds to the terminal, wherein, lifting mechanism drives test board to drop to the first position, and the probe group and the terminal upper surface elasticity contact, thereby with the other pole of power supply conduction, and the lifting mechanism drive test board rises after short circuit, and the probe group on test board is separated from the terminal, and then can take out package module. The test fixture structure of the application is simple, and the test efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of packaging module testing equipment technology, and in particular to packaging module testing fixture. Background Technology

[0002] The SOT-227 package is a commonly used modular package for fast recovery diodes. This package falls between a single diode and a module, featuring internal insulation, a small module size, low thermal resistance, high current carrying capacity, and suitability for operation in high-voltage, high-efficiency, and high-temperature environments. It also exhibits excellent thermal performance and mechanical stability.

[0003] In the manufacturing process of SOT-227 packaged modules, a large external force must be applied to the terminals after the housing is assembled to achieve the purpose of bending the terminals. During the bending process, the housing obstructs the view and it is impossible to determine whether the internal components are damaged. Therefore, it is necessary to perform factory insulation testing on SOT-227 packaged modules.

[0004] Insulation testing requires applying a forward and reverse voltage of up to 3500V to the four terminals on the top and the bottom of the SOT-227 packaged module. Since the exposed contact portion of the terminals after bending is only 1mm thick, ordinary test grippers are insufficient to effectively hold them. Furthermore, the toothed structure of the grippers can easily scratch the terminal surface, resulting in poor appearance. Therefore, screws need to be installed on the four ports of the module, and then the test grippers hold the screws for testing. This method requires repeated screw installation and removal by the operator, which is time-consuming and labor-intensive.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model discloses a packaging module test fixture to solve the problem of low efficiency in testing SOT-227 packaged modules using conventional test fixtures.

[0007] The technical solution adopted in this utility model is as follows: A packaging module test fixture includes: a base; a carrier disposed on the base, with a first groove at its upper end, the bottom of which exposes a conductive plate connected to one pole of a power supply; a packaging module snapped into the first groove, having four terminals at its upper end and a metal base plate at its lower end, the metal base plate being in electrical contact with the conductive plate; a bracket disposed on the upper end of the base and located at the rear end of the carrier; a lifting mechanism disposed above the front end of the bracket; and a test plate connected to the output end of the lower end of the lifting mechanism, with four sets of probes passing through the test plate, the probes being connected to the other pole of the power supply, the probes being positioned corresponding to the terminals; wherein, the lifting mechanism drives the test plate to descend to a first position, and the probes elastically contact the upper surface of the terminals.

[0008] A further technical solution is that each probe group has four probes, positioned at the four corners of the upper surface of the terminal, and the probes are spring probes.

[0009] A further technical solution is that the carrier includes a conductive plate disposed on the upper end of the base 1 and a limiting block disposed on the upper end of the conductive plate, wherein a first through groove is formed in the middle of the limiting block.

[0010] A further technical solution is that the limiting block has two blocks, which are symmetrically arranged with respect to the center line of the conductive plate. A slot is opened at one end of the two limiting blocks adjacent to each other, and the two slots form a first groove. A second groove is formed between the two limiting blocks.

[0011] A further technical solution is that an extension is provided at the front end of the conductive plate, and a protrusion is provided at the upper end of the extension.

[0012] A further technical solution is that the screw passes through the limiting block and the conductive plate and is threadedly connected to the base.

[0013] A further technical solution is that the lifting mechanism includes a fixed seat disposed at the front end of the bracket, a sleeve disposed on the lower side of the front end of the fixed seat, the lifting mechanism also includes a rocker arm, a hinge and a connecting rod, one end of the rocker arm is hinged to the upper side of the front end of the fixed seat, the other end of the rocker arm is rotatably connected to the upper end of the hinge, the upper end of the connecting rod is rotatably connected to the lower end of the hinge, and the lower end of the connecting rod is fixedly connected to the test plate.

[0014] A further technical solution is that two sliding rods are mounted on the front end of the bracket, and the sliding rods pass through the test plate.

[0015] A further technical solution is that the base, test plate, bracket and limiting block are made of insulating material.

[0016] A further technical solution is to provide a reinforcing rib between the rear end of the bracket and the upper end of the base.

[0017] The beneficial effects of this utility model embodiment are as follows: (I) The packaging module test fixture of this utility model involves placing the packaging module in the first groove of the carrier, with the metal base plate at the lower end of the packaging module electrically connected to the exposed conductive plate, thereby connecting to one pole of the power supply. A lifting mechanism drives the test board to descend to the first position, where the probe group on the test board elastically contacts the terminal surface at the upper end of the packaging module, thus connecting to the other pole of the power supply. After short-circuiting, the lifting mechanism drives the test board to rise, and the probe group on the test board disengages from the terminals, allowing the packaging module to be removed. The test fixture of this application has a simple structure, enabling simple handling and testing of large batches of packaging modules, reducing testing time and manpower / material costs, and improving testing efficiency.

[0018] (ii) Furthermore, the carrier includes a conductive plate disposed on the upper end of the base and a limiting block disposed on the upper end of the conductive plate. The limiting block has two blocks, which are symmetrically arranged with respect to the center line of the conductive plate. A slot is opened at one end of the adjacent two limiting blocks, and the two slots form a first groove. A second groove is formed between the two limiting blocks, so that the operator's hand can take and put the encapsulation module through the second groove. Attached Figure Description

[0019] Figure 1 This is an isometric view of the packaging module test fixture of this utility model.

[0020] Figure 2 This is an isometric view of the packaging module test fixture of this utility model after the test board has been removed.

[0021] Figure 3 This is an isometric view of the packaging module in the packaging module test fixture of this utility model from a first-view perspective.

[0022] Figure 4 This is an isometric view of the packaging module in the packaging module test fixture of this utility model from a second perspective.

[0023] Figure 5 This is a side view of the packaging module test fixture of this utility model.

[0024] In the picture: 1. Base; 2. Bracket; 21. Reinforcing rib; 3. Lifting assembly; 31. Fixed seat; 311. Shaft fork; 312. Sleeve; 32. Rocker arm; 33. Hinge; 34. Connecting rod; 35. Slide rod; 36. Mounting block; 4. Carrier; 41. Conductive plate; 411. Extension; 412. Protrusion; 42. Limiting block; 43. First groove; 44. Second groove; 5. Test plate; 51. Probe group; 6. Packaging module; 61. Terminal; 62. Metal base plate. Detailed Implementation

[0025] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0026] Example: This embodiment discloses a test fixture for packaging modules.

[0027] like Figure 1 As shown, the packaging module test fixture includes a base 1, a carrier 4, a packaging module 6, a bracket 2, a lifting mechanism 3, and a test board 5.

[0028] like Figure 2 As shown, the carrier 4 is mounted on the base 1, with a first groove 43 at its upper end. A conductive plate 41 is exposed at the bottom of the first groove 43, and the conductive plate 41 is connected to one of the terminals of the power supply. Exemplarily, the carrier 4 includes a conductive plate 41 mounted on the upper end of the base 1 and a limiting block 42 mounted on the upper end of the conductive plate 41. The limiting block 42 has a through-groove first groove 43 in its center. The limiting block 42 is made of insulating material, and the conductive plate 41 is made of conductive material. The conductive plate 41 is connected to the negative terminal of the power supply. Specifically, a screw passes through the limiting block 42 and the conductive plate 41 and is threadedly connected to the base 1, facilitating the installation and removal of the limiting block 42 and the conductive plate 41. An extension 411 is provided at the front end of the conductive plate 41, and a protrusion 412 is provided at the upper end of the extension 411. Specifically, the protrusion 412 is a screw, which is threadedly connected to the conductive plate 41, facilitating the clamping of the power supply to engage with the packaging module 6.

[0029] like Figure 2 As shown, preferably, the limiting block 42 has two blocks, which are symmetrically arranged with respect to the center line of the conductive plate 41. A slot is opened at one end of the two limiting blocks 42 adjacent to each other, and the two slots form a first groove 43. A second groove 44 is formed between the two limiting blocks 42, so that the operator's hand can take and put the encapsulation module 6 through the second groove 44.

[0030] like Figures 1-4 As shown, the encapsulation module 6 is snapped into the first groove 43, with four terminals 61 at the upper end and a metal base plate 62 at the lower end. The metal base plate 62 is in electrical contact with the conductive plate 41. Specifically, the encapsulation module 6 is an SOT-227 encapsulation module 6.

[0031] like Figure 1 , Figure 2 and Figure 5As shown, the bracket 2 is positioned on the upper end of the base 1 and at the rear end of the carrier 4. The lifting mechanism 3 is positioned above the front end of the bracket 2. The test plate 5 is connected to the output terminal at the lower end of the lifting mechanism 3. Four sets of probe groups 51 are disposed on the test plate 5, and the probe groups 51 are connected to the other pole of the power supply. The positions of the probe groups 51 correspond to the terminals 61. The lifting mechanism 3 drives the test plate 5 to descend to the first position, where the probe groups 51 elastically contact the upper surface of the terminals 61. For example, each probe group 51 has four probes, positioned at the four corners of the upper surface of the terminals 61. The probes are spring probes, and a four-probe method is used for testing to eliminate interference from contact resistance and lead resistance, thereby improving detection accuracy. The lifting mechanism 3 includes a fixed base 31 disposed at the front end of the bracket 2, a sleeve 312 disposed on the lower side of the front end of the fixed base 31, and the lifting mechanism 3 also includes a rocker arm 32, a hinge 33, and a connecting rod 34. One end of the rocker arm 32 is hinged to the upper side of the front end of the fixed base 31, the other end of the rocker arm 32 is rotatably connected to the upper end of the hinge 33, the upper end of the connecting rod 34 is rotatably connected to the lower end of the hinge 33, and the lower end of the connecting rod 34 is fixedly connected to the test plate 5. Specifically, a shaft fork 311 is disposed on the upper side of the front end of the fixed base 31, one end of the rocker arm 32 is connected to the shaft fork 311 through a first rotating shaft, the other end of the rocker arm 32 is connected to the upper end of the hinge 33 through a second rotating shaft, and the upper end of the connecting rod 34 is connected to the lower end of the hinge 33 through a third rotating shaft. Figure 5 As shown, in use, rotating the rocker arm 32 clockwise around the first rotating axis causes the hinge 33 to rotate counterclockwise around the third rotating axis, pushing the connecting rod 34 downward. The connecting rod 34 then lowers the test plate 5, and the probe group 51 on the test plate 5 elastically contacts the terminal 61 to achieve positive voltage conduction. Rotating the rocker arm 32 counterclockwise around the first rotating axis causes the hinge 33 to rotate clockwise around the third rotating axis, pulling the connecting rod 34 upward. The connecting rod 34 then raises the test plate 5, and the probe group 51 on the test plate 5 disengages from the terminal 61. In other embodiments of this utility model, the lifting mechanism 3 can also be a lifting cylinder, which is fixed to the front end of the bracket 2. The lower end of the lifting cylinder is retractably connected to a piston rod, and the test plate 5 is connected to the lower end of the piston rod to de-energize the packaging module.

[0032] like Figure 1 , Figure 2 and Figure 5 As shown, further, two sliding rods 35 are mounted on the front end of the bracket 2, and the sliding rods 35 pass through the test plate 5. Specifically, mounting blocks 36 are provided on the upper and lower sides of the front end of the bracket 2, and the sliding rods 35 are positioned between the two mounting blocks 36, guiding the sliding direction of the test plate 5. Preferably, an elastic element is sleeved on the outer side of the sliding rod 35, with both ends of the elastic element connected to the lower end of the test plate 5 and the upper end of the mounting block 36 located at the lower end, respectively. The elastic element provides the elastic force required for the test plate 5 to reset.

[0033] Furthermore, the base 1, test plate 5, bracket 2, and limit block 42 are made of insulating materials.

[0034] like Figure 1 , Figure 2 and Figure 5 As shown, furthermore, a reinforcing rib 21 is provided between the rear end of the bracket 2 and the upper end of the base 1 to improve the support strength of the bracket 2 for the lifting mechanism 3 and the test plate 5.

[0035] In this embodiment, by placing the packaging module 6 in the first groove 43 of the carrier 4, the metal base plate 62 at the lower end of the packaging module 6 is electrically connected to the exposed conductive plate 41, thereby connecting to one of the power supplies. The lifting mechanism 3 drives the test board 5 to descend to the first position, and the probe group 51 on the test board 5 elastically contacts the surface of the terminal 61 at the upper end of the packaging module 6, thereby connecting to the other power supply. After short-circuiting, the lifting mechanism 3 drives the test board 5 to rise, and the probe group 51 on the test board 5 disengages from the terminal 61. Then, the packaging module 6 can be removed. The test fixture of this application has a simple structure and can perform simple pick-and-place-test on a large batch of packaging modules 6, reducing testing time and manpower and material costs, and improving testing efficiency.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A test fixture for a packaged module, characterized in that, The packaging module test fixture includes: Base; A carrier is mounted on the base, with a first groove at the top, and a conductive plate exposed at the bottom of the first groove. The conductive plate is connected to one pole of a power source. The encapsulation module is snapped into the first groove, has four terminals at the upper end and a metal base plate at the lower end, and the metal base plate is in electrical contact with the conductive plate. A bracket is disposed on the upper end of the base and located at the rear end of the vehicle; A lifting mechanism is located above the front end of the bracket; A test board is connected to the output terminal at the lower end of the lifting mechanism. Four sets of probes are arranged through the test board. The probes are connected to the other pole of the power supply. The positions of the probes correspond to the terminals. The lifting mechanism drives the test board to descend to the first position, and the probe group makes elastic contact with the upper surface of the terminal.

2. The packaging module test fixture according to claim 1, characterized in that: Each probe group has four probes, positioned at the four corners of the upper surface of the terminal, and the probes are spring probes.

3. The packaging module test fixture according to claim 1, characterized in that: The carrier includes a conductive plate disposed on the upper end of the base (1) and a limiting block disposed on the upper end of the conductive plate, wherein a first through groove is formed in the middle of the limiting block.

4. The packaging module test fixture according to claim 3, characterized in that: The limiting block has two blocks, which are symmetrically arranged with respect to the center line of the conductive plate. A slot is opened at one end of the two limiting blocks adjacent to each other, and the two slots form a first groove. A second groove is formed between the two limiting blocks.

5. The packaging module test fixture according to claim 3, characterized in that: The conductive plate has an extension at its front end, and a protrusion is provided at the upper end of the extension.

6. The packaging module test fixture according to claim 3, characterized in that: The screw passes through the limiting block and the conductive plate and is threaded to the base.

7. The packaging module test fixture according to claim 1, characterized in that: The lifting mechanism includes a fixed base disposed at the front end of the bracket, a sleeve disposed on the lower side of the front end of the fixed base, and the lifting mechanism also includes a rocker arm, a hinge and a connecting rod. One end of the rocker arm is hinged to the upper side of the front end of the fixed base, the other end of the rocker arm is rotatably connected to the upper end of the hinge, the upper end of the connecting rod is rotatably connected to the lower end of the hinge, and the lower end of the connecting rod is fixedly connected to the test plate.

8. The packaging module test fixture according to claim 1, characterized in that: Two sliding rods are mounted on the front end of the bracket, and the sliding rods pass through the test plate.

9. The packaging module test fixture according to claim 3, characterized in that: The base, test plate, bracket, and limit block are made of insulating material.

10. The packaging module test fixture according to claim 1, characterized in that: A reinforcing rib is provided between the rear end of the bracket and the upper end of the base.

Images