Power module sample locking jig and power module cycle test system
By using a bearing structure in the power module sample locking fixture, the problem of the sample rotating with the threaded rod during the locking process was solved, achieving stable locking of the sample and the fixture, improving locking accuracy and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LIONSGATE MICROELECTRONICS (WENLING) CO LTD
- Filing Date
- 2025-05-15
- Publication Date
- 2026-04-24
AI Technical Summary
In the prior art, power module samples are prone to rotation with the threaded rod during the locking process, which can damage the sample or tooling fixture and increase production and maintenance costs.
The power module sample locking fixture adopts a bearing structure. By abutting the top surface of the power module sample with the bearing, the rotational inertia of the threaded rod is eliminated, ensuring that the sample and the fixture remain stationary.
This avoids damage to power module samples or tooling fixtures, improves the accuracy and quality of locking, and reduces production and maintenance costs.
Smart Images
Figure CN224163713U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of device testing technology, and more specifically, to a power module sample locking fixture and a power module cyclic testing system. Background Technology
[0002] IGBT (Insulated Gate Bipolar Transistor) power semiconductor devices are core components of electronic products, and are typically available in single-transistor and modular forms. Before these devices are released to the market, they must undergo reliability testing to ensure the system's stability and long-term performance.
[0003] For the power cycle test, the power module sample needs to be fixedly attached to a water-cooled plate using a fixture. Several gantry-like structures are positioned above the water-cooled plate, and the fixture is fixed between two gantry frames to attach the power module sample from top to bottom. Currently, the fixture uses threaded rods to perform the attachment operation.
[0004] However, during the locking operation, the power module sample may rotate as the screws are turned. This not only affects the normal locking of the threaded rod and causes damage to the power module sample, but may also cause the threaded rod at the bottom of the main fixture to be twisted or tilted, making it unable to withstand the normal torque value, thereby reducing the service life of the fixture and increasing production and maintenance costs.
[0005] In the prior art, when using tooling fixtures to fix power module samples, the power module sample may rotate with the threaded rod, resulting in damage to the power module sample or the tooling fixture. Utility Model Content
[0006] The purpose of this application is to provide a power module sample locking fixture and a power module cyclic testing system to solve the problem in the prior art where the power module sample or tooling fixture is damaged due to the rotation of the threaded rod.
[0007] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:
[0008] On one hand, embodiments of this application provide a power module sample clamping fixture, applied to a power module cyclic testing system. The power module cyclic testing system further includes a support frame and a testing machine. The power module sample clamping fixture includes:
[0009] The main structure is used to fix it to the support frame;
[0010] A threaded rod that penetrates the main structure;
[0011] A bearing connected to the bottom of the threaded rod is used to abut against the top surface of the power module sample located on the test bench when locked.
[0012] Optionally, the bearing includes an outer ring, an inner ring, and rolling elements, the rolling elements being disposed between the outer ring and the inner ring, and the outer ring being sleeved outside the inner ring;
[0013] The inner ring is fixedly connected to the bottom of the threaded rod, and when in the locked state, the outer ring abuts against the top surface of the power module sample.
[0014] Optionally, the bottom of the outer ring is provided with a support panel, which contacts and supports the sample surface of the power module when it is in the locked state.
[0015] Optionally, the power module sample locking fixture further includes a force-bearing component, which is sleeved on the top of the threaded rod; wherein the force-bearing component is used to drive the threaded rod to rotate when a force is applied.
[0016] Optionally, the force-bearing component is a nut, one end of which is fitted onto the top of the threaded rod, and the other end of which is provided with a cutting surface.
[0017] Optionally, the force-bearing component is a nut, one end of which is fitted onto the top of the threaded rod, and the other end of which is provided with a force-bearing rod body.
[0018] Optionally, the main structure is configured to be symmetrical about the threaded rod.
[0019] Optionally, the main structure is configured as an "I" shaped structure, the main structure is provided with a threaded hole extending from the top to the bottom, the threaded rod passes through the threaded hole through the main structure and is threadedly connected to the main structure; the main structure is connected and fixed to the support frame through grooves on both sides.
[0020] Optionally, the materials used to manufacture the main structure and the threaded rod include copper, iron, or alloy materials.
[0021] On the other hand, embodiments of this application also provide a power module cyclic testing system, which includes the power module sample locking fixture described above.
[0022] Compared with the prior art, the embodiments of this application have the following beneficial effects:
[0023] This application provides a power module sample locking fixture and a power module cyclic testing system. The power module cyclic testing system further includes a support frame and a testing machine. The power module sample locking fixture includes a main structure for fixing to the support frame; a threaded rod penetrating the main structure; and a bearing connected to the bottom of the threaded rod. The bearing, in the locked state, abuts against the top surface of the power module sample on the testing machine. Because the power module sample locking fixture provided in this application includes a bearing, and in the locked state, the bearing abuts against the top surface of the power module sample, the rotational inertia caused by the threaded rod is eliminated when the threaded rod rotates. The bearing and the power module sample remain stationary, thereby preventing damage to the power module sample or the fixture.
[0024] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the structure of the power module sample locking fixture provided in the embodiments of this application.
[0027] Figure 2 This is a schematic diagram of the bearing structure provided in an embodiment of this application.
[0028] Figure 3 This is a schematic diagram of the structure of the threaded rod provided in an embodiment of this application.
[0029] Figure 4 A schematic diagram of the main structure provided in the embodiments of this application.
[0030] Figure 5 This is a structural schematic diagram of a stress-bearing component provided in an embodiment of this application.
[0031] In the picture:
[0032] 100 - Power module sample locking fixture; 110 - Main structure; 120 - Threaded rod; 130 - Bearing; 140 - Force-bearing component; 111 - Threaded hole; 131 - Outer ring; 132 - Inner ring; 133 - Rolling element. Detailed Implementation
[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0034] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0035] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0036] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.
[0037] In the description of this application, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0038] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0039] As described in the background section, when performing power cycle testing on power module samples, a fixture is needed to secure the power module sample to a water-cooled plate. During this securing process, a threaded rod needs to be tightened to lock the power module sample in place. The securing described in this application refers to fixing the power module sample to the water-cooled plate. However, in practical applications, when using a threaded rod for securing, the threaded rod provides not only downward pressure during rotation but also rotational inertia, which may cause the power module sample to rotate along with the threaded rod, potentially damaging the sample. Furthermore, this process may also cause the threaded rod to become misaligned or tilted at the bottom, leading to damage to the fixture.
[0040] In view of this, in order to solve the above problems, this application provides a power module sample locking fixture, which avoids the power module sample from rotating when the threaded rod rotates by setting a bearing in the power module sample locking fixture.
[0041] The following is an exemplary description of the power module sample locking fixture provided in this application:
[0042] As an optional implementation, the power module sample locking fixture 100 is used in a power module cyclic testing system. This system also includes a support frame and a testing machine. The support frame is used to fix the power module sample locking fixture 100, and the testing machine is used to fix the power module sample. Generally, a water-cooled plate is provided on the testing machine. The power module sample is placed on the water-cooled plate and locked in place by the power module sample locking fixture 100, thereby achieving power cyclic testing.
[0043] Please see Figure 1 The power module sample locking fixture 100 includes a main structure 110, a threaded rod 120, and a bearing 130. The main structure 110 is used to fix it on the support frame. The threaded rod 120 passes through the main structure 110. The bearing 130 is connected to the bottom of the threaded rod 120. The bearing 130 is used to abut against the top surface of the power module sample located on the test bench when locked.
[0044] By setting the bearing 130, the rotational inertia generated during the rotation of the threaded rod 120 can be eliminated through the bearing 130. The bearing 130 and the power module sample remain stationary, thereby avoiding damage to the power module sample or tooling fixture.
[0045] Please see Figure 2The bearing 130 includes an outer ring 131, an inner ring 132, and a rolling element 133. The rolling element 133 is disposed between the outer ring 131 and the inner ring 132. For example, the rolling element 133 can be a ball. The outer ring 131 is fitted over the inner ring 132, and the inner ring 132 is fixedly connected to the bottom of the threaded rod 120. Furthermore, the height of the inner ring 132 is less than the height of the outer ring 131, so that when in the locked state, only the outer ring 131 abuts against the top surface of the power module sample, while the inner ring 132 does not contact the power module sample.
[0046] The bottom of the threaded rod 120 is fixedly connected to the inner ring 132. When the threaded rod 120 is rotated, it provides a certain rotational inertia and downward pressure. Under the action of inertia, the inner ring 132 of the bearing 130 can rotate freely relative to the outer ring 131, but the position of the outer ring 131 and the power module sample is fixed and will not rotate. That is, by having the inner ring 132 of the bearing 130 rotate with the threaded rod 120, the inertia of the threaded rod 120 during rotation is eliminated, while only downward pressure is applied to the outer ring 131, thus fixing the relative position between the outer ring 131 and the power module sample and achieving locking of the power module sample.
[0047] Based on this, on the one hand, the power module sample locking fixture 100 provided in this application can greatly ensure the locking quality of the sample during power cycle testing. Due to the bearing structure at the bottom of the locking fixture, the contact surface between the fixture and the sample will not rotate when the threaded rod 120 rotates, which can ensure that the screw hole is not twisted during the locking process, and the bottom bearing 130 head will not tilt due to excessive force during locking, thus ensuring the accuracy and quality of locking and improving the uniformity of the locking torque.
[0048] On the other hand, when the power module sample is locked during power cycling testing, it can be completely locked onto the water-cooled plate. The force on the four corners of the power module sample needs to be uniform and adjustable during locking. The power module sample locking fixture 100 provided in this application uses a bearing 130 to contact the power module sample, which increases the contact area between the power module sample locking fixture 100 and the power module sample. This ensures that the four corners of the sample bear the same uniform force, and the force on different areas can be adjusted at any time during sample locking, thus ensuring the uniformity of heat dissipation of the power module sample during power cycling testing.
[0049] In one implementation, to further increase the contact area between the bearing 130 and the power module sample, a support panel is provided at the bottom of the outer ring 131. When in the locked state, the support panel contacts and supports the surface of the power module sample. That is, in this implementation, the bottom of the bearing 130 is set as a panel, and by having the panel contact the power module sample, the contact area between the power module sample and the bearing 130 is increased, making the force on the power module sample more uniform. Furthermore, during the locking process, if tilting or deflection occurs, the power module sample is less likely to be damaged. The position of the fixture or the angle of the threaded rod 120 can be adjusted appropriately, utilizing the flexibility of the bearing 130 for fine-tuning to ensure correct locking. Due to the structure of the bearing 130 at the bottom, the bottom of the fixture remains stable when the threaded rod 120 rotates and does not rotate with it, thus achieving stable and precise locking.
[0050] Please see Figure 3 The threaded rod 120 provided in this application is configured as a cylindrical rod, and the outer surface of the threaded rod 120 is provided with threads. Moreover, the diameter of the threaded rod 120 matches the inner diameter of the inner ring 132 of the bearing 130, thereby ensuring that the inner ring 132 and the threaded rod 120 are fixedly connected after the bearing 130 is sleeved on the bottom of the threaded rod 120.
[0051] As one implementation method, in order to ensure that the main structure 110 can be more stably fixed on the support frame, the main structure 110 is configured as a symmetrical structure about the threaded rod 120.
[0052] For example, please see Figure 4 The main structure 110 is set as an "I" shaped structure. The main structure 110 is provided with a threaded hole 111 that runs from the top to the bottom. The threaded rod 120 passes through the threaded hole 111 and is threadedly connected to the main structure 110. The main structure 110 is connected and fixed to the support frame through the grooves on both sides.
[0053] like Figure 4 As shown, when the main structure 110 is set as an "I"-shaped structure, grooves are provided on both sides of the main structure 110, namely the first groove and the second groove. Optionally, the support frame provided in this application can adopt a gantry structure, and a fixing structure is set on the gantry. The fixing structure is engaged with the first groove and the second groove, so that the height of the main structure 110 remains unchanged, and it cannot move in the horizontal direction.
[0054] Understandably, because the main structure 110 is symmetrically designed, its overall fixation is more stable and less prone to uneven stress. Simultaneously, by employing an "I"-shaped structure, the power module sample can be fixed on the power cycle water-cooling test bench, thus fixing the horizontal force. When the vertical threaded rod 120 is engaged, the horizontal force is fixed by the "I"-shaped structure, preventing the entire fixture from wobbling horizontally. Only the vertical force acts on the power module sample, thereby securing the power module sample used for power cycle testing. The structure is simple and easy to operate.
[0055] Furthermore, in order to ensure the overall strength and stability of the power module sample locking fixture 100, the main structure 110 and the threaded rod 120 provided in this application are made of materials such as copper, iron or alloys.
[0056] Please continue reading Figure 1 In order to facilitate the screwing of the threaded rod 120, the power module sample locking fixture 100 also includes a force-bearing member 140, which is sleeved on the top of the threaded rod 120; wherein, the force-bearing member 140 is used to drive the threaded rod 120 to rotate when force is applied.
[0057] In actual operation, the staff can drive the threaded rod 120 to rotate by turning the force-bearing component 140, thereby locking the power module sample.
[0058] As one implementation method, please refer to Figure 5 The force-bearing component 140 is a nut, with one end fitted onto the top of the threaded rod 120, and the other end having a cut surface. Specifically, one end of the nut is cylindrical with a threaded groove at its end. The thread in the groove matches the thread on the threaded rod 120, thus enabling the connection between the nut and the threaded rod 120. Meanwhile, the other end of the nut is rectangular, facilitating manual rotation of the threaded rod 120 using tools, such as a torque wrench.
[0059] In another implementation, the force-bearing component 140 is configured as a nut, with one end of the nut fitted onto the top of the threaded rod of the rolling element 133, and the other end of the nut of the rolling element 133 having a force-bearing rod. By providing a force-bearing rod, it is convenient for workers to manually rotate the threaded rod 120 by turning the nut manually.
[0060] As can be seen, the working principle of the power module sample locking fixture provided in this application is as follows:
[0061] After placing the power module sample on the water-cooled plate of the testing machine, the main structure and support frame are fixed in place, preventing the main structure from moving in any direction. Then, the bottom of the threaded rod is inserted into the threaded hole at the top of the main structure, and the threaded rod is rotated by rotating the nut at the top. During rotation, the bottom of the threaded rod descends relative to the main structure and passes through it. The bottom of the threaded rod is then installed with a bearing, and the threaded rod is continued to rotate, causing the bearing to descend further until it contacts the top surface of the power module sample. Continuing to rotate the threaded rod locks the power module sample onto the water-cooled plate. The relative position between the bearing and the power module sample remains unchanged throughout this process, preventing the power module sample from rotating with the bearing. Of course, after testing, the threaded rod can be rotated in the opposite direction to separate the bearing from the power module sample. For example, rotating the threaded rod clockwise moves it downwards; rotating it counterclockwise moves it upwards.
[0062] In summary, this application provides a power module sample locking fixture and a power module cyclic testing system. The power module cyclic testing system further includes a support frame and a testing machine. The power module sample locking fixture includes a main structure for fixing to the support frame; a threaded rod penetrating the main structure; and a bearing connected to the bottom of the threaded rod, which, in the locked state, abuts against the top surface of the power module sample on the testing machine. Because the power module sample locking fixture provided in this application includes a bearing, and in the locked state, the bearing abuts against the top surface of the power module sample, the rotational inertia caused by the threaded rod is eliminated when the threaded rod rotates. The bearing and the power module sample remain stationary, thereby preventing damage to the power module sample or the fixture.
[0063] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
[0064] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A power module sample locking fixture, characterized in that, An application is made in a power module cyclic testing system, the power module cyclic testing system further including a support frame and a testing machine, the power module sample locking fixture including: The main structure is used to fix it to the support frame; A threaded rod that penetrates the main structure; A bearing connected to the bottom of the threaded rod is used to abut against the top surface of the power module sample located on the test bench when locked.
2. The power module sample locking fixture as described in claim 1, characterized in that, The bearing includes an outer ring, an inner ring, and rolling elements, wherein the rolling elements are disposed between the outer ring and the inner ring, and the outer ring is sleeved outside the inner ring; The inner ring is fixedly connected to the bottom of the threaded rod, and when in the locked state, the outer ring abuts against the top surface of the power module sample.
3. The power module sample locking fixture as described in claim 2, characterized in that, The bottom of the outer ring is provided with a support panel. When it is in the locked state, the support panel contacts and supports the sample surface of the power module.
4. The power module sample locking fixture as described in claim 1, characterized in that, The power module sample locking fixture also includes a force-bearing component, which is sleeved on the top of the threaded rod; wherein, the force-bearing component is used to drive the threaded rod to rotate when a force is applied.
5. The power module sample locking fixture as described in claim 4, characterized in that, The force-bearing component is a nut, one end of which is fitted onto the top of the threaded rod, and the other end of which has a cutting surface.
6. The power module sample locking fixture as described in claim 4, characterized in that, The force-bearing component is a nut, one end of which is fitted onto the top of the threaded rod, and the other end of which is provided with a force-bearing rod body.
7. The power module sample locking fixture as described in claim 1, characterized in that, The main structure is configured to be symmetrical about the threaded rod.
8. The power module sample locking fixture as described in claim 7, characterized in that, The main structure is configured as an "I" shaped structure, and the main structure has a threaded hole that runs from the top to the bottom. The threaded rod passes through the threaded hole and is threadedly connected to the main structure. The main structure is connected to and fixed to the support frame through grooves on both sides.
9. The power module sample locking fixture as described in claim 1, characterized in that, The materials used to manufacture the main structure and the threaded rod include copper, iron, or alloy materials.
10. A power module cyclic testing system, characterized in that, The power module cyclic testing system includes the power module sample locking fixture as described in any one of claims 1 to 9.