Power device test fixture

Abstract

The utility model provides a power device test fixture, which comprises a main body part provided with a first surface and a second surface which are opposite to each other; the heat dissipation part is arranged on the first surface of the main body part; the accommodating groove is formed in the second surface of the main body part and is used for loading a power device, and an opening communicated with the outside is formed in the side surface of the accommodating groove; and the cover plate is connected to the second surface of the main body part and is used for enabling the power device to abut against the interior of the accommodating groove. By adopting the power device test fixture provided by the utility model, the power device can be conveniently and efficiently loaded on the test fixture before a high-temperature power-up test, so that the efficiency and the accuracy of the high-temperature power-up test are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of semiconductors, in particular to a power device testing fixture. Background Art

[0002] MOSFET / IGBT is currently a popular power device, and the most widely used package is usually TO247-3L / 4L. Since the power device generates a lot of heat (high junction temperature) in actual application, if the product does not dissipate heat well, it will cause thermal imbalance, form positive feedback and lead to non-intrinsic failure of the device. Therefore, it is necessary to perform high-temperature power-on (power-on high temperature) test on the power devices in the above packages to evaluate their high-temperature power-on reliability.

[0003] In the related art, the steps of performing a high-temperature power-on test on a power device may include: first, applying thermal grease on the surface of a heat sink, then placing the power device to be tested on the thermal grease, and wrapping a high-temperature tape around the power device and the heat sink so that the power device is fixed to the heat sink through the thermal grease, and then electrically connecting the pins of the power device for a power-on test.

[0004] When the above-mentioned fixture and method are used to perform high-temperature power-on tests on multiple (for example, dozens of) products at the same time, it not only consumes manpower (coating thermal grease and winding high-temperature tape) and wastes materials (waste of thermal grease and high-temperature tape), but there is also the risk of uneven coating of thermal grease or falling off of high-temperature tape, resulting in high junction temperature of the power device and thus distortion of its reliability results. Utility Model Content

[0005] The utility model aims to provide a power device test fixture for conveniently and efficiently performing high-temperature power-on test of power devices.

[0006] In order to solve the above technical problems, the utility model provides a power device test fixture, comprising:

[0007] A main body having a first surface and a second surface opposite to each other;

[0008] a heat dissipation portion disposed on the first surface of the main body;

[0009] A receiving groove provided on the second surface of the main body, used for loading power devices, and a side surface of the receiving groove is provided with an opening communicating with the outside;

[0010] The cover plate connected to the second surface of the main body is used to press the power device tightly into the accommodating groove.

[0011] Optionally, the heat dissipation portion includes a plurality of heat dissipation fins arranged at intervals on the first surface of the main body.

[0012] Optionally, the heat dissipation portion and the main body portion are integrally formed of metal material.

[0013] Optionally, an elastic pad is provided on a side of the cover plate facing the second surface, and the elastic pad corresponds to the receiving groove and is used to press the power device tightly into the receiving groove.

[0014] Optionally, the elastic pad is a high temperature resistant rubber pad.

[0015] Optionally, the size of the containing groove matches the size of the power device, and the depth of the containing groove is greater than or equal to the thickness of the power device.

[0016] Optionally, the first end of the cover plate is rotatably connected to a corresponding end of the main body, and the second end of the cover plate is detachably connected to a corresponding end of the main body.

[0017] Optionally, the cover plate is detachably connected to the main body.

[0018] Optionally, the detachable connection includes a bolt connection or a snap connection.

[0019] Optionally, the size of the opening is smaller than the size of the side wall of the accommodating groove where the opening is located.

[0020] In summary, the power device test fixture provided by the utility model includes: a main body, having a first surface and a second surface opposite to each other; a heat dissipation portion arranged on the first surface of the main body; a receiving groove arranged on the second surface of the main body, used to load the power device, and the side of the receiving groove is provided with an opening connected to the outside; a cover plate connected to the second surface of the main body, used to press the power device tightly into the receiving groove. The loading step of the test fixture using the utility model includes dripping thermal grease on the bottom wall of the receiving groove, then placing the power device into the receiving groove, and then covering the cover plate on the second surface of the main body so that the cover plate and the power device in the receiving groove are in tight contact, so as to use the opening of the receiving groove to discharge the air and excess thermal grease between the bottom wall of the receiving groove and the bottom surface of the power device, so that the thermal grease is evenly distributed between the bottom wall of the receiving groove and the bottom surface of the power device, and at the same time fix the power device in the receiving groove. From the above process, it can be seen that the use of the test fixture of the utility model can conveniently and efficiently realize the loading of power devices before high-temperature power-on testing, and is conducive to ensuring the uniform arrangement of thermal grease, thereby improving the efficiency and accuracy of high-temperature power-on testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Those skilled in the art should understand that the drawings provided are used to better understand the present invention and do not constitute any limitation to the present invention.

[0022] Figure 1is a schematic diagram of the end face of the power device test fixture provided in the first embodiment;

[0023] Figure 2 is a schematic top view of the main body of the power device test fixture provided in the first embodiment;

[0024] Figure 3 It is a schematic diagram of the end face of the power device test fixture provided in the second embodiment.

[0025] In the attached figure:

[0026] 10-main body; 20-heat dissipation part; 30-cover plate; 11-first surface; 12-second surface; 13-accommodating groove; 14-opening; 31-first end; 32-second end; 33a-hole; 33b-bolt; 33c-screw hole; 34-elastic pad. DETAILED DESCRIPTION

[0027] In order to make the purpose, advantages and features of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model. In addition, the structure shown in the drawings is often a part of the actual structure. In particular, the emphasis of each drawing is different, and sometimes different scales are used.

[0028] It should be understood that when an element or layer is referred to as "on...", "connected to" other elements or layers, it can be directly on other elements or layers, connected to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on...", "directly connected to" other elements or layers, there is no intervening element or layer. Although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish an element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teaching of the present invention, the first element, component, region, layer or part discussed below can be expressed as a second element, component, region, layer or part. Spatial relationship terms such as "under...", "below", "below", "above...", "above", "above", etc., can be used here for the convenience of description to describe the relationship between an element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, the spatial relationship terms are intended to include different orientations of the devices in use and operation. For example, if the device in the accompanying drawings is turned over, then, the elements or features described as "under...", "below", "below" will be oriented to be "on" other elements or features. The device can be oriented in other ways (rotated 90 degrees or other orientations) and the spatial descriptors used here are interpreted accordingly. The purpose of the terms used here is only to describe specific embodiments and is not a limitation of the utility model. When used here, the singular forms of "one", "one" and "said / the" are also intended to include plural forms, unless the context clearly indicates another way. It should also be understood that the term "including" is used to determine the existence of features, steps, operations, elements and / or parts, but does not exclude the existence or addition of one or more other features, steps, operations, elements, parts and / or groups. When used here, the term "and / or" includes any and all combinations of the relevant listed items.

[0029] Embodiment 1

[0030] Embodiment 1 provides a power device test fixture.

[0031] Figure 1 is a schematic diagram of the end face of the power device test fixture provided in the first embodiment; Figure 2 1 is a schematic top view of the main body of the power device test fixture provided in the first embodiment.

[0032] like Figure 1 and Figure 2As shown, the power device test fixture provided in this embodiment includes a main body 10, a heat dissipation portion 20, a receiving groove 13 and a cover plate 30. The main body 10 has a first surface 11 and a second surface 12 opposite to each other; the heat dissipation portion 20 is provided on the first surface 11 of the main body 10; the receiving groove 13 is provided on the second surface 12 of the main body 10 for loading the power device, and the side of the receiving groove 13 is provided with an opening 14 communicating with the outside; the cover plate 30 is connected to the second surface 12 of the main body 10, and is used to press the power device tightly into the receiving groove 13.

[0033] The main body 10 may be flat to facilitate heat conduction to the power device. In this embodiment, the main body 10 may be a flat rectangular parallelepiped, and the two opposite faces of the rectangular parallelepiped with the largest area are the first face 11 and the second face 12. The heat dissipation portion 20 is used to conduct the heat of the main body 10 (power device) and dissipate it to the outside. It has a large surface (specific surface area) to facilitate heat dissipation. In this embodiment, the heat dissipation portion 20 may include a plurality of heat sinks arranged at intervals on the first face 11 of the main body 10. These heat sinks may be of any suitable shape and arranged on the first face 11 in any suitable arrangement. In one example, the heat sink may be in the form of a flat sheet (heat sink fins), and a plurality of heat sink fins are arranged in an array on the first face 11 of the main body 10. In another example, the heat sink may be in the form of a curved sheet (heat sink curved sheet), and a plurality of heat sink curved sheets are arranged in a ring shape on the first face 11 of the main body 10. The main body 10 and the heat dissipation part 20 may be made of materials with good thermal conductivity, such as metal, and the main body 10 and the heat dissipation part 20 may be connected by welding or integral molding.

[0034] Please continue to refer to Figure 1 and Figure 2, a plurality of receiving grooves 13 are provided on the second surface 12 of the main body 10 for loading power devices during high temperature power-on testing. The plane dimensions of the receiving grooves 13 (e.g., the dimensions on the second surface 12) can match the plane dimensions (package dimensions) of the (packaged) power device to facilitate fixing the power device. The side walls of the receiving grooves 13 are provided with openings 14 connected to the outside world for leading out the circuits electrically connected to the power device, and more importantly, the above-mentioned openings 14 can also be used to discharge the air and excess thermal grease between the bottom wall of the receiving groove 13 and the bottom surface (heat dissipation surface) of the power device. Take the steps of loading the power device into the receiving groove 13 of the present embodiment as an example: first, drop some thermal grease on the bottom wall of the receiving groove 13, then put the power device into the receiving groove 13 (the heat dissipation surface of the power device faces the bottom of the receiving groove 13), and press the power device so that the thermal grease is evenly arranged on the bottom wall of the receiving groove 13 and the bottom surface of the power device, and the air and excess thermal grease between the bottom wall of the receiving groove 13 and the bottom surface of the power device are discharged. It is not difficult to see from the above that using the receiving groove 13 of the present embodiment to load the power device is not only conducive to achieving uniform coating of the thermal grease, but also can uniformly control the thickness of the thermal grease according to the degree (force) of pressing, and is also conducive to recycling the discharged excess thermal grease to save materials.

[0035] In one example, taking a power device in a TO247 package as an example, the packaged power device includes a packaging part and pins led out from the packaging part, the planar size of the accommodating groove 13 can perfectly match the size of the packaging part of the power device, the accommodating groove 13 is arranged in the main body 10, and the opening 14 is extended from the side wall of the accommodating groove 13 (connected) to the corresponding side wall of the main body 10 and extends the pins of the power device out of the main body 10, that is, the size of the opening 14 is smaller than the size of the side wall of the accommodating groove 13 where the opening 14 is arranged, so that the power device is surrounded by the accommodating groove 13 on all sides (the accommodating groove 13 is separated from the side wall of the main body 10 by a certain distance, or the size of the opening 14 is smaller than the side wall size of the accommodating groove 13 where the opening 14 is arranged), which is conducive to fixing the power device. In another example, the plane size of the accommodating groove 13 can perfectly match the size of the packaging part of the power device, and the opening 14 of the accommodating groove 13 is provided on a side wall of the main body 10, that is, the accommodating groove 13 is provided with only three side walls (the spacing between the corresponding side walls of the accommodating groove 13 and the main body 10 is 0, or the size of the opening 14 is equal to the size of the side wall of the accommodating groove 13 where the opening 14 is provided), and the power device is pressed and fixed in the accommodating groove 13 by using the cover plate 30. In some other examples, the plane size of the accommodating groove 13 can be slightly larger than the size of the packaging part of the power device, and it is also feasible to provide a limiting structure in the accommodating groove 13 to fix the power device.

[0036] In particular, when the cover plate 30 is provided on the second surface 12 of the main body 10 to fix the power device in the receiving groove 13, a protruding elastic pad 34 may be provided on the side of the cover plate 30 facing the second surface 12. The elastic pad 34 corresponds to the power device in the receiving groove 13 and is used to press the power device tightly in the receiving groove 13, so as to press the power device to discharge air and excess thermal grease, and fix the power device at the same time. The elastic pad 34 may be a high temperature resistant rubber pad, and its thickness after compression may correspond to the depth of the receiving groove 13 and the thickness of the power device.

[0037] Please continue to refer to Figure 1 The cover plate 30 may include a first end 31 and a second end 32 opposite to each other. The first end 31 of the cover plate 30 is provided with a rotating connection mechanism for rotatingly connecting with one end of the main body 10 to realize the opening and closing of the cover plate 30. The second end 32 of the cover plate 30 is provided with a detachable connection mechanism for detachably connecting with the other end of the main body 10 to realize the connection between the cover plate 30 and the main body 10. In one example, the detachable connection is a bolt connection. Specifically, a plurality of holes 33a are provided on the second end 32 of the cover plate 30, and screw holes 33c are provided on the second surface 12 of the main body 10 to correspond to the holes 33a. When the cover plate 30 is covered on the second surface 12 of the main body 10, the bolts 33b pass through the holes 33a on the cover plate 30 and are tightened with the screw holes 33c on the second surface 12 to fix the cover plate 30 to the second surface 12 of the main body 10. In another example, the detachable connection may also be a snap connection.

[0038] It is understandable that, under the premise that the size of the main body 10 is sufficient, multiple accommodating grooves 13 can be set on the second surface 12 of the main body 10 so as to load multiple power devices at the same time for high temperature power-on testing, so as to save jigs and increase the loading rate. In one example, taking each jig as an example of loading only one power device, it takes about 0.6 hours to load 80 samples (power devices) using the jig of this embodiment (including setting thermal grease and fixing power devices), while it usually takes at least 1.5 hours to manually apply thermal grease and wrap high temperature tape to fix 80 samples in the related art.

[0039] Embodiment 2

[0040] Embodiment 2 provides a power device test fixture.

[0041] Figure 3 It is a schematic diagram of the end face of the power device test fixture provided in the second embodiment.

[0042] like Figure 3As shown, the power device test fixture provided in this embodiment includes a main body 10, a heat dissipation portion 20, a receiving groove 13 and a cover plate 30. The main body 10 has a first surface 11 and a second surface 12 opposite to each other; the heat dissipation portion 20 is provided on the first surface 11 of the main body 10; the receiving groove 13 is provided on the second surface 12 of the main body 10 for loading the power device, and the side of the receiving groove 13 is provided with an opening 14 communicating with the outside; the cover plate 30 is connected to the second surface 12 of the main body 10, and is used to press the power device tightly into the receiving groove 13.

[0043] The power device test fixture of this embodiment is consistent with the test fixture of Example 1 in principle and basic structure, and the difference lies mainly in the different ways of connecting the cover plate 30 and the cover plate 30 to the main body 10. Specifically, the first end 31 and the second end 32 of the cover plate 30 are detachably connected to both ends of the main body 10, and both ends (the first end 31 and the second end 32) of the cover plate 30 may be provided with a detachable connection mechanism to be detachably connected to the corresponding ends of the main body 10. The above-mentioned detachable connection may include a bolt connection and / or a snap connection. In one example, the first end 31 and the second end 32 of the cover plate 30 are both bolted or snap-fitted to the main body 10. In another example, the first end 31 or the second end 32 of the cover plate 30 is bolted to the main body 10, and the other end of the cover plate 30 is snap-fitted to the main body 10.

[0044] In summary, the power device test fixture provided by the utility model is used to perform high-temperature power-on test on the packaged power device, including: a main body, having a first surface and a second surface opposite to each other; a heat dissipation portion arranged on the first surface of the main body; a receiving groove arranged on the second surface of the main body, used to load the power device, and the side of the receiving groove is provided with an opening connected to the outside; a cover plate connected to the second surface of the main body, used to press the power device tightly into the receiving groove. The loading step of the test fixture using the utility model includes dripping thermal grease on the bottom wall of the receiving groove, then placing the power device into the receiving groove, and then covering the cover plate on the second surface of the main body so that the cover plate and the power device in the receiving groove are in close contact, so as to use the opening of the receiving groove to discharge the air and excess thermal grease between the bottom wall of the receiving groove and the bottom surface of the power device, so that the thermal grease is evenly distributed between the bottom wall of the receiving groove and the bottom surface of the power device, and at the same time fix the power device in the receiving groove. From the above process, it can be seen that the use of the test fixture of the utility model can conveniently and efficiently realize the loading of power devices before high-temperature power-on testing, and is conducive to ensuring the uniform arrangement of thermal grease, thereby improving the efficiency and accuracy of high-temperature power-on testing.

[0045] The above description is only a description of the preferred embodiment of the utility model, and is not any limitation on the scope of the utility model. Any changes and modifications made by ordinary technicians in the field of the utility model based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A power device test fixture, characterized in that: include: A main body having a first surface and a second surface opposite to each other; a heat dissipation portion disposed on the first surface of the main body; A receiving groove provided on the second surface of the main body, used for loading power devices, and a side surface of the receiving groove is provided with an opening communicating with the outside; The cover plate connected to the second surface of the main body is used to press the power device tightly into the accommodating groove.

2. The power device test fixture according to claim 1, characterized in that: The heat dissipation portion includes a plurality of heat dissipation fins arranged at intervals on the first surface of the main body portion.

3. The power device test fixture according to claim 2, characterized in that: The heat dissipation part and the main body are integrally formed of metal material.

4. The power device test fixture according to claim 1, characterized in that: An elastic pad is provided on the side of the cover plate facing the second surface, and the elastic pad corresponds to the accommodating groove and is used to press the power device tightly into the accommodating groove.

5. The power device test fixture according to claim 4, characterized in that: The elastic pad is a high temperature resistant rubber pad.

6. The power device test fixture according to any one of claims 1 to 5, characterized in that: The size of the containing groove matches the size of the power device, and the depth of the containing groove is greater than or equal to the thickness of the power device.

7. The power device test fixture according to claim 1, characterized in that: The first end of the cover plate is rotatably connected to a corresponding end of the main body, and the second end of the cover plate is detachably connected to a corresponding end of the main body.

8. The power device test fixture according to claim 1, characterized in that: The cover plate is detachably connected to the main body.

9. The power device test fixture according to claim 7 or 8, characterized in that: The detachable connection includes a bolt connection or a snap connection.

10. The power device test fixture according to claim 1, characterized in that: The size of the opening is smaller than the size of the side wall of the accommodating groove where the opening is located.

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