Test fixture and power device test system

Abstract

The utility model discloses a test fixture and a power device test system, and relates to the technical field of electronic device test. The test fixture comprises a base, a cover plate, a heat dissipation piece and a driving assembly. The cover plate and the base are matched to define a test cavity, and the cover plate is further provided with an assembly hole communicated with the test cavity; the heat dissipation piece is installed on the side, away from the base, of the cover plate in a floating mode, and a contact protruding part is arranged on the side, facing the cover plate, of the heat dissipation piece in a protruding mode and inserted into the assembly hole in a sliding mode. And the driving assembly is in transmission connection with the heat dissipation piece, and the driving assembly is used for driving the contact convex part to be tightly pressed on the to-be-tested piece in the to-be-tested cavity. The test fixture provided by the utility model can improve the heat dissipation efficiency of the to-be-tested piece in the test process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic device testing, and in particular to a test fixture and a power device testing system. BACKGROUND

[0002] Power electronic devices are critical components in electronic equipment, capable of handling high voltage and high current, and are the core of power conversion and circuit control. In order to ensure that power electronic devices can maintain stable and efficient performance under various working conditions, a series of reliability tests are usually performed on power electronic devices after manufacturing.

[0003] However, the existing fixtures for testing power electronic devices are prone to cause the heat of the power electronic devices to be unable to dissipate quickly outward, resulting in heat accumulation of the power electronic devices and affecting the test results. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a test fixture and a power device testing system to improve the heat dissipation efficiency during the testing of the device under test.

[0005] The present application provides a test fixture, comprising:

[0006] a base;

[0007] a cover plate cooperating with the base to enclose a test cavity, the cover plate further having an assembly hole communicating with the test cavity;

[0008] a heat dissipation member floatingly installed on a side of the cover plate away from the base, the heat dissipation member having a contact protrusion protruding from a side thereof facing the cover plate, the contact protrusion being slidingly inserted into the assembly hole;

[0009] a driving assembly in transmission connection with the heat dissipation member, the driving assembly being configured to press the contact protrusion against a device under test in the test cavity.

[0010] In some possible embodiments, the driving assembly comprises a first connecting member and an elastic member, the first connecting member being slidingly inserted into the heat dissipation member, one end of the first connecting member being connected to the cover plate, and the other end of the first connecting member being limited to a side of the heat dissipation member away from the cover plate.

[0011] One end of the elastic member acts on the heat dissipation member, and the other end of the elastic member acts on the first connecting member or the cover plate, the elastic member being configured to drive the heat dissipation member to move towards the cover plate.

[0012] In some possible embodiments, the first connecting member has a limiting edge at an end thereof away from the cover plate, the limiting edge being limited to a side of the heat dissipation member away from the cover plate.

[0013] The elastic member is arranged between the side of the heat dissipation member away from the cover plate and the limiting edge, and abuts between the limiting edge and the heat dissipation member. When the heat dissipation member is not subjected to external force, the elastic member is in a compressed or naturally elongated state.

[0014] In some possible implementation manners, the test fixture further comprises a heating member, which is detachably arranged on the side of the contact protrusion facing the test cavity.

[0015] In some possible implementation manners, the test fixture further comprises a first rotating shaft and a first torsional spring. One end of the cover plate is pivotally connected to one end of the base through the first rotating shaft, and the first torsional spring is sleeved on the first rotating shaft. One end of the first torsional spring acts on the cover plate, and the other end of the first torsional spring acts on the base.

[0016] In some possible implementation manners, the end of the cover plate away from the first rotating shaft is connected with a buckle, and the end of the base away from the first rotating shaft is connected with a clamping block matched with the buckle.

[0017] When the cover plate is closed on the base, the buckle is clamped with the clamping block.

[0018] In some possible implementation manners, the buckle comprises an operation part and a clamping part connected with each other, and the connection part of the clamping part and the operation part is pivotally connected with the cover plate.

[0019] The clamping part is located on the side of the cover plate away from the first rotating shaft, and is used for clamping with the clamping block.

[0020] The side of the cover plate away from the base is provided with an avoiding groove, and the operation part is accommodated in the avoiding groove. When the buckle is not subjected to external force, the end of the operation part away from the clamping part is spaced apart from the groove bottom of the avoiding groove.

[0021] In some possible implementation manners, the test fixture further comprises a second rotating shaft and a second torsional spring. The connection part of the operation part and the clamping part is pivotally connected with the cover plate through the second rotating shaft, and the second torsional spring is sleeved on the second rotating shaft. One end of the second torsional spring acts on the cover plate, and the other end of the second torsional spring acts on the buckle. The second torsional spring is used for driving the clamping part to move towards the cover plate.

[0022] In addition, the application further provides a power device test system comprising the test fixture provided in each of the above embodiments.

[0023] In some possible implementation manners, at least two connecting holes are further formed in the base, and the at least two connecting holes are arranged on the circumferential side of the base;

[0024] The power device testing system further comprises a testing board and at least two second connecting members, the at least two second connecting members are arranged in one-to-one correspondence with the at least two connecting holes, one end of the second connecting member is connected to the testing board, and the other end of the second connecting member is arranged in the connecting hole and connected to the base.

[0025] The test fixture provided by the application can realize the rapid heat dissipation of the to-be-tested member, and avoid the influence of the to-be-tested member on the test effect due to the excessively high temperature. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0027] Figure 1 A cross-sectional structure schematic diagram of the test fixture in some embodiments is shown;

[0028] Figure 2 A side view structure schematic diagram of part of the structure of the test fixture when it is opened in some embodiments is shown;

[0029] Figure 3 A structure schematic diagram of the test fixture when it is unfolded in some embodiments is shown;

[0030] Figure 4 Another cross-sectional structure schematic diagram of the test fixture in some embodiments is shown;

[0031] Figure 5 A part of the structure schematic diagram of the test board in some embodiments is shown;

[0032] Figure 6 A connection structure schematic diagram of the base and the test board in some embodiments is shown.

[0033] Main element symbol explanation:

[0034] 1000-test fixture;

[0035] 100 - base; 110 - first sink groove; 121 - elastic terminal; 122 - pin group; 130 - first connecting hole;

[0036] 200 - cover plate; 210 - assembly hole; 220 - second sink groove; 230 - avoiding groove;

[0037] 300 - heat dissipation member; 310 - heat dissipation member body; 311 - fin; 320 - contact convex part;

[0038] 400 - driving assembly; 410 - first connecting piece; 411 - connecting rod part; 412 - limiting rim; 420 - elastic piece;

[0039] 511 - first rotating shaft; 512 - first torsion spring; 521 - second rotating shaft; 522 - second torsion spring;

[0040] 610 - buckle; 611 - clamping part; 612 - operation part; 620 - clamping block;

[0041] 700 - test cavity;

[0042] 800 - heating member;

[0043] 2000 - test plate; 2100 - second connecting hole;

[0044] 3000 - second connecting piece; 4000 - to-be-tested member. DETAILED DESCRIPTION

[0045] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as a limitation of the present application.

[0046] In the description of the present application, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0047] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and are not used to denote or imply relative importance or a number of indications of the technical features indicated. Thus, the technical features defined with "first", "second", etc. can explicitly or implicitly include one or more of the technical features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0048] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0050] As shown in FIGS. Figure 1 and Figure 2 An embodiment provides a test fixture 1000, which can be applied to a power device test system to realize performance testing of a device under test 4000. The device under test 4000 can be a semiconductor type power device. Of course, the device under test 4000 can also be other electronic devices that need to be tested.

[0051] In some embodiments, the test fixture 1000 includes a base 100, a cover plate 200, a heat dissipation member 300 and a driving assembly 400. The cover plate 200 can be connected to one side of the base 100, and the cover plate 200 can cooperate with the base 100 to enclose a test cavity 700. It can be understood that the size and shape of the test cavity 700 can be matched with the device under test 4000. In addition, the cover plate 200 is also provided with an assembly hole 210 which communicates the test cavity 700 with the external environment.

[0052] The heat dissipation member 300 can be floatingly mounted on the side of the cover plate 200 away from the base 100. The side of the heat dissipation member 300 facing the cover plate 200 is provided with a contact protrusion 320. The contact protrusion 320 can be slidingly inserted into the assembly hole 210 and can be arranged in an extendable and retractable manner relative to the test cavity 700.

[0053] The driving assembly 400 can be in transmission connection with the heat dissipation member 300. The driving assembly 400 can be used to drive the heat dissipation member 300 to move towards the cover plate 200, so that the contact protrusion 320 is pressed against the test piece 4000.

[0054] When the test piece 4000 is tested, the test piece 4000 can be placed in the test cavity 700 between the base 100 and the cover plate 200. The end of the test piece 4000 facing the cover plate 200 can be inserted into the assembly hole 210 and abut against the contact protrusion 320. Under the action of the driving assembly 400, the contact protrusion 320 can be pressed against the test piece 4000 and tightly attached to the test piece 4000. The heat can be quickly transferred between the test piece 4000 and the contact protrusion 320, ensuring that the heat generated by the test piece 4000 during the test can be quickly transferred to the heat dissipation member 300 and dissipated to the outside through the heat dissipation member 300. Thus, the test piece 4000 can be quickly cooled, avoiding the influence of the test piece 4000 due to high temperature on the test effect.

[0055] As shown in Figures 1 to 3 In some embodiments, the base 100 is provided with a first recess 110 on the side facing the cover plate 200. The first recess 110 can be a part of the test cavity 700. The cover plate 200 can be provided with a second recess 220 on the side facing the base 100. The second recess 220 can also be a part of the test cavity 700. When the cover plate 200 is connected to the base 100, the second recess 220 can be in opposite communication with the first recess 110 and cooperatively form the test cavity 700.

[0056] In the embodiment, the assembly hole 210 can be located on the side of the second recess 220 away from the first recess 110 and in communication with the second recess 220.

[0057] In some embodiments, the base 100 is provided with an elastic terminal 121 on the side facing the cover plate 200. The elastic terminal 121 can be located on the side of the first recess 110. When the test piece 4000 is placed in the first recess 110, the pin or other structure on the test piece 4000 can be lapped on the elastic terminal 121 and in contact and electrical connection with the elastic terminal 121.

[0058] In some embodiments, the elastic terminal 121 can be a spring sheet or a spring pin structure with elasticity, which can ensure the stability and reliability of the electrical connection between the test piece 4000.

[0059] In some embodiments, a pin group 122 is also provided on the side of the base 100 away from the first sink 110. The protruding end of the pin group 122 relative to the base 100 can be used to electrically connect to the test board 2000 in the power device test system, and the other end of the pin group 122 can be electrically connected to the elastic terminal 121 by means of welding or other methods.

[0060] like Figures 1 to 3 As shown, in some embodiments, one end of the cover plate 200 can be pivotally connected to one end of the base 100 via a first pivot 511. Accordingly, the cover plate 200 can be opened and closed relative to the base 100. When it is necessary to open the test chamber 700 to take out or put in the test piece 4000, the cover plate 200 can be rotated relative to the base 100 so that the end of the cover plate 200 away from the first pivot 511 moves away from the base 100 to open the test chamber 700. When it is necessary to fix the test piece 4000 for testing, the cover plate 200 can be rotated relative to the base 100 so that the end of the cover plate 200 away from the first pivot 511 gradually approaches the base 100 to close the test chamber 700. In some embodiments, the end of the cover plate 200 away from the first pivot 511 can be detachably connected to the end of the base 100 away from the first pivot 511.

[0061] In some embodiments, a first torsion spring 512 is also sleeved on the first rotating shaft 511. One end of the first torsion spring 512 can act on the cover plate 200, and the other end of the first torsion spring 512 can act on the base 100. When it is necessary to open the test fixture 1000, the end of the cover plate 200 away from the first rotating shaft 511 can be unlocked from the base 100, and the cover plate 200 can spring open relative to the base 100 under the action of the first torsion spring 512, which can improve the convenience of operator operation.

[0062] In some embodiments, the end of the cover plate 200 away from the first pivot 511 can be snapped into the base 100.

[0063] In other embodiments, the end of the cover plate 200 away from the first rotating shaft 511 can also be detachably connected to the base 100 by means of bolts or other means.

[0064] like Figures 1 to 3 As shown, a latch 610 may be provided at the end of the cover plate 200 away from the first rotating shaft 511, and the latch 610 may be positioned towards the base 100. A locking block 620 adapted to the latch 610 may be provided at the end of the base 100 away from the first rotating shaft 511. In the embodiment, the cover plate 200 and the base 100 can be detachably connected by the latch 610 and the locking block 620.

[0065] In some embodiments, the buckle 610 can include an integral operation portion 612 and a clamping portion 611, and the operation portion 612 and the clamping portion 611 are substantially perpendicular. The connection between the operation portion 612 and the clamping portion 611 can be rotatably connected to the end of the cover plate 200 away from the first rotating shaft 511 through the second rotating shaft 521.

[0066] The clamping portion 611 can extend to the side of the cover plate 200 away from the first rotating shaft 511 and extend towards the base 100. The end of the clamping portion 611 away from the second rotating shaft 521 can be in a clamping hook structure and can be clamped with the clamping block 620. The operation portion 612 can be located on the side of the cover plate 200 away from the base 100 and can extend towards the first rotating shaft 511. In some embodiments, the side of the cover plate 200 away from the base 100 is also provided with a relief groove 230, and the operation portion 612 can be accommodated in the relief groove 230. When the clamping portion 611 is connected with the clamping block 620, the end of the operation portion 612 away from the clamping portion 611 can be spaced apart from the groove bottom of the relief groove 230.

[0067] In some embodiments, the second torsional spring 522 is also sleeved on the second rotating shaft 521. One end of the second torsional spring 522 acts on the buckle 610, and the other end of the second torsional spring 522 acts on the cover plate 200. In embodiments, the second torsional spring 522 can be used to drive the clamping portion 611 to rotate towards the inside of the cover plate 200. The inside of the cover plate 200 can refer to the side of the cover plate 200 facing the base 100. When the buckle 610 is clamped with the clamping block 620, the second torsional spring 522 can prevent the clamping portion 611 from being unlocked by being randomly separated from the clamping block 620.

[0068] When it is necessary to unlock the buckle 610 and the clamping block 620, the operator can press the operation portion 612 to drive the clamping portion 611 to move away from the inside of the cover plate 200, so that the clamping portion 611 can be separated from the clamping block 620, thereby achieving the unlocking of the buckle 610 and the clamping block 620. When the operator releases the operation portion 612, the clamping portion 611 can be reset towards the inside of the cover plate 200 under the action of the second torsional spring 522.

[0069] In other embodiments, the buckle 610 can be an integral structure with the cover plate 200, and the buckle 610 can have a certain elasticity.

[0070] In some embodiments, the clamping block 620 can be an integral structure with the base 100.

[0071] In other embodiments, the clamping block 620 can also be fixedly installed on the end of the base 100 away from the first rotating shaft 511 and located on the side of the base 100 facing the cover plate 200 through screw connection or other methods.

[0072] As Figure 1As shown, the heat dissipation member 300 further comprises a heat dissipation member body 310, which can be in one-piece structure with the contact protrusion 320. In embodiments, the heat dissipation member body 310 can be located on the side of the cover plate 200 away from the base 100.

[0073] In some embodiments, the driving assembly 400 can comprise a first connecting member 410 and an elastic member 420. The first connecting member 410 can comprise an integral connecting rod portion 411 and a limiting rim 412, which can be located on one end of the connecting rod portion 411.

[0074] In some embodiments, the connecting rod portion 411 can be arranged through the heat dissipation member body 310, and the heat dissipation member body 310 can slide along the connecting rod portion 411. The end of the connecting rod portion 411 away from the limiting rim 412 can be inserted into the cover plate 200 and can be screwed with the cover plate 200. The limiting rim 412 can be limited on the side of the heat dissipation member body 310 away from the cover plate 200, so as to limit the heat dissipation member 300 from being separated from the cover plate 200.

[0075] In some embodiments, the elastic member 420 can be a spring. The elastic member 420 can be sleeved on the connecting rod portion 411. The elastic member 420 can be located on the side of the heat dissipation member body 310 away from the cover plate 200 and between the limiting rim 412 and the heat dissipation member body 310. One end of the elastic member 420 can abut against the side of the limiting rim 412 facing the connecting rod portion 411, and the other end of the elastic member 420 can abut against the side of the heat dissipation member body 310 away from the cover plate 200. When the heat dissipation member 300 is not subjected to external force, the elastic member 420 can be in a natural elongation state or a compression state.

[0076] In other embodiments, the elastic member 420 can be arranged on the side of the heat dissipation member body 310 facing the cover plate 200. One end of the elastic member 420 can be fixedly connected to the heat dissipation member body 310, and the other end of the elastic member 420 can be fixedly connected to the connecting rod portion 411 or the cover plate 200. When the heat dissipation member 300 is not subjected to external force, the elastic member 420 can be in a natural elongation state or a tension state.

[0077] In other embodiments, the elastic member 420 can also be a spring sheet.

[0078] During the process of covering the cover plate 200 on the base 100, the contact protrusion 320 of the heat dissipation member 300 can gradually contact the test piece 4000 in the test cavity 700, and the test piece 4000 can gradually extrude the contact protrusion 320, so that the contact protrusion 320 is retracted relative to the test cavity 700. During this process, the heat dissipation member body 310 can gradually extrude the elastic member 420, so that the elastic member 420 is elastically deformed and stores a certain elastic potential energy. Thus, during the test process, the contact protrusion 320 of the heat dissipation member 300 can be pressed on the test piece 4000 under the action of the elastic member 420, so as to realize the close fit between the test piece 4000 and the heat dissipation member 300, and then realize the rapid heat transfer between the test piece 4000 and the heat dissipation member 300.

[0079] In other embodiments, the driving assembly 400 can include a driving member and a support, and the driving member can be a gas cylinder, an electric push rod, or an electric steel structure. The driving member can be fixedly installed on the side of the cover plate 200 away from the base 100 through the support, and the output shaft of the driving member can be fixedly connected to the side of the cover plate 200 and the heat dissipation member 300. The driving member can be used to drive the heat dissipation member 300 to move, so that the contact protrusion 320 is retracted relative to the test cavity 700. During the test process, the driving member can drive the contact protrusion 320 of the heat dissipation member 300 to be pressed on the test piece 4000, so that the contact protrusion 320 is closely fitted with the test piece 4000, so as to realize the rapid heat transfer.

[0080] As shown in Figure 1 In some embodiments, the side of the heat dissipation member body 310 away from the contact protrusion 320 can be provided with a plurality of fins 311, and an air flow channel can be arranged between adjacent two fins 311. On the one hand, the heat dissipation area of the heat dissipation member 300 can be increased, and on the other hand, the side of the heat dissipation member body 310 away from the cover plate 200 can also form a convection of gas, so as to accelerate the heat dissipation of the heat dissipation member 300.

[0081] As shown in Figure 1 and Figure 4 The test fixture 1000 also includes a heating member 800, which is detachably arranged on the side of the contact protrusion 320 facing the test cavity 700. During the test process, the heating member 800 can provide temperature compensation for the test piece 4000, so that the test piece 4000 is in the required temperature range. In some embodiments, the heating member 800 can be selected from one or more combinations of thermocouples, heating sheets, or heating blocks.

[0082] In some embodiments, the heating member 800 can be directly placed on the test piece 4000 during the test process, and clamped by the heat dissipation member 300 and the test piece 4000. When the heating member 800 is not needed, the heating member 800 can be directly removed and placed in a suitable storage position.

[0083] In other embodiments, the heating element 800 may also be connected to the side of the contact protrusion 320 facing the test cavity 700 via a structure such as a bracket. The bracket may be connected to the contact protrusion 320 via screws or snap-fit ​​connections.

[0084] like Figure 1 , Figure 3 , Figure 5 and Figure 6 As shown, the embodiment also provides a power device testing system, which may include a host (not shown), a test board 2000, and a test fixture 1000 provided in the embodiment.

[0085] In some embodiments, the base 100 is further provided with at least two first connection holes 130, which may be distributed around the periphery of the base 100. The test plate 2000 may be provided with at least two second connection holes 2100, which may correspond one-to-one with the at least two first connection holes 130.

[0086] In some embodiments, the base 100 may have four first connection holes 130, which may be located at the four corners of the base 100. The test board 2000 may also have four second connection holes 2100, which correspond one-to-one with the four first connection holes 130.

[0087] In other embodiments, the first connecting hole 130 and the second connecting hole 2100 may also be configured as two, three, five or other groups as needed.

[0088] When connecting the test fixture 1000 to the test board 2000, the four first connection holes 130 and the four second connection holes 2100 can be aligned one-to-one, and the pin group 122 can be inserted into the corresponding metallized holes of the test board 2000. Alternatively, a second connector 3000 can be sequentially inserted through the second connection holes 2100 and the first connection holes 130, and screwed to the first connection hole 130. The end of the second connector 3000 away from the base 100 can be positioned to abut against the side of the test board 2000 opposite to the base 100, thus achieving a fixed connection between the test fixture 1000 and the test board 2000, facilitating the subsequent soldering of the pin group 122 to the test board 2000. In this embodiment, the second connector 3000 can be a screw.

[0089] In other embodiments, the second connector 3000 may also be a combination of bolts and nuts.

[0090] During the test, the test board 2000 can be connected to the host, and the host can control the operation of other electrical components in the power device test system as well as the operation of the device under test 4000.

[0091] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0092] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A test fixture, comprising: The test fixture comprises a base, a cover plate, a heat dissipation member, a driving assembly, and a heating member. The cover plate is matched with the base to form a test cavity. The heat dissipation member is floatingly installed on the side of the cover plate away from the base. The driving assembly is in transmission connection with the heat dissipation member. The driving assembly is used to drive the contact protrusion to press on the to-be-tested member in the test cavity.

2. The test fixture of claim 1, wherein, The driving assembly comprises a first connecting member and an elastic member. One end of the first connecting member is connected to the cover plate.

3. The test fixture of claim 2, wherein, The other end of the first connecting member is limited on the side of the heat dissipation member away from the cover plate. One end of the elastic member acts on the heat dissipation member.

4. The test fixture of any one of claims 1 to 3, wherein, The other end of the elastic member acts on the first connecting member or the cover plate.

5. The test fixture of claim 1, wherein, The elastic member is used to drive the heat dissipation member to move towards the cover plate.

6. The test fixture of claim 5, wherein, The first connecting member is provided with a limiting edge at the end away from the cover plate. The limiting edge is limited on the side of the heat dissipation member away from the cover plate.

7. The test fixture of claim 6, wherein, The elastic member is arranged between the side of the heat dissipation member away from the cover plate and the limiting edge. The elastic member is in abutment between the limiting edge and the heat dissipation member. When the heat dissipation member is not subjected to external force, the elastic member is in a compressed or naturally elongated state.

8. The test fixture of claim 7, wherein, The test fixture further comprises a heating member.

9. A power device testing system, characterized by, The heating member is detachably arranged on the side of the contact protrusion towards the test cavity.

10. The power device testing system of claim 9, wherein, The test fixture further comprises a first pivot and a first torsional spring. One end of the cover plate is pivoted to one end of the base through the first pivot. The first torsional spring is sleeved on the first pivot. One end of the first torsional spring acts on the cover plate. The other end of the first torsional spring acts on the base. The cover plate is connected with a buckle at the end away from the first pivot. The base is connected with a clamping block adapted to the buckle at the end away from the first pivot. When the cover plate is closed on the base, the buckle is clamped with the clamping block. The buckle comprises an operating part and a clamping part connected with each other. The connection part of the clamping part and the operating part is pivoted to the cover plate. The clamping part is located on the side of the cover plate away from the first pivot. The clamping part is used to clamp with the clamping block. The cover plate is provided with an avoiding slot on the side away from the base. The operating part is accommodated in the avoiding slot. When the buckle is not subjected to external force, the end of the operating part away from the clamping part is spaced apart from the bottom of the avoiding slot. The test fixture further comprises a second pivot and a second torsional spring. The connection part of the operating part and the clamping part is pivoted to the cover plate through the second pivot. The second torsional spring is sleeved on the second pivot. One end of the second torsional spring acts on the cover plate. The other end of the second torsional spring acts on the buckle. The second torsional spring is used to drive the clamping part to move towards the cover plate. The test fixture comprises the test fixture according to any one of claims 1 to 8. The base is further provided with at least two connecting holes. The at least two connecting holes are distributed on the circumferential side of the base. The power device testing system further comprises a testing plate and at least two second connecting members, the at least two second connecting members are arranged one by one corresponding to the at least two connecting holes, one end of the second connecting member is connected to the testing plate, and the other end of the second connecting member is arranged through the connecting hole and connected to the base.

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