Constant-temperature table for testing thermal resistance of small-power device

Abstract

The invention relates to the technical field of thermal resistance testing, and particularly discloses a thermal resistance testing constant-temperature table for a small-power device. Comprising a workbench, a constant-temperature part, a rotating frame and a pressing tool, a supporting face is arranged on the workbench, the constant-temperature part is arranged below the supporting face, the rotating frame can rotate relative to the supporting face, and the pressing tool is arranged on the rotating frame and can transversely slide relative to the rotating frame. The low-power device thermal resistance test constant-temperature table solves the problem that a fixing structure cannot be adjusted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermal resistance testing, in particular to a small power device thermal resistance testing constant temperature platform. BACKGROUND

[0002] In the research and development and manufacturing field of small power semiconductor devices and micro electronic components, accurate measurement of thermal resistance characteristics has become a key link to ensure the reliability of the device and optimize the heat dissipation design. With the development of small power devices towards high power density, high integration and miniaturization, the heat generated per unit volume increases significantly, and the heat dissipation space is continuously compressed, resulting in rapid rise of junction temperature, which greatly affects the performance and life of small power devices, so the small power devices need to be tested for thermal resistance after assembly.

[0003] Small power device thermal resistance testing can quantify the difficulty of heat conduction from the chip junction to the shell or environment, which is a key parameter for evaluating the thermal management capability of power devices. When performing thermal resistance testing, the small power device needs to be placed in a constant temperature environment, and the constant temperature platform is usually used to provide a constant temperature environment.

[0004] The commonly used constant temperature platform is shown in the patent of a semiconductor device thermal resistance measuring device disclosed in application number CN120334702A, which includes a workbench, a constant temperature base is arranged in the middle of the workbench, and a rack is arranged on one side of the workbench above the constant temperature base, a thermal resistance detector is matched on the rack, and a pressing mechanism is arranged on the top of the rack and can press against the end face of the constant temperature base to press the semiconductor device to be tested. The middle of the upper end face of the constant temperature base is provided with a flexible heat-conducting contact pad for adapting to the shape of the semiconductor device to be tested, and a temperature control assembly is arranged in the flexible heat-conducting contact pad. The pressing mechanism is matched with an environment simulation mechanism, which is used to form a simulated environment for the semiconductor device to be tested on the constant temperature base when the pressing mechanism abuts against the semiconductor device to be tested. The temperature control assembly arranged in the flexible heat-conducting contact pad includes a semiconductor refrigeration matrix, and the bottom of the flexible heat-conducting contact pad is matched with a fixing seat, and the bottom surface of the fixing seat is fixed with a heat insulation layer, and the semiconductor refrigeration matrix is arranged between the flexible heat-conducting contact pad and the heat insulation layer.

[0005] When the above device works, the constant temperature environment is provided by the flexible heat-conducting contact pad, and the pressure head as a fixed structure limits and fixes the semiconductor device to be tested. However, the pressure head can only slide vertically and cannot adjust the fixed position according to the shape and size of the semiconductor device. When the placement position of the semiconductor device is located on the side of the pressure head, the pressure head cannot be repositioned to be opposite to the semiconductor device by adjusting the position of the pressure head, but only the semiconductor device can be moved. In actual implementation, when the size of the small power device is small, especially the thickness, it is not convenient to re-pick up and move the position after placing the small power device on the workbench. SUMMARY

[0006] The present application intends to provide a small power device thermal resistance test constant temperature platform to solve the problem of fixed structure cannot be adjusted.

[0007] To achieve the above object, the present application adopts the following technical scheme: a small power device thermal resistance test constant temperature platform, comprising a workbench, a constant temperature part, a rotating frame and a pressing tool, the workbench is provided with a supporting surface, the constant temperature part is arranged below the supporting surface, the rotating frame can rotate relative to the supporting surface, and the pressing tool is arranged on the rotating frame and can slide along the horizontal direction relative to the rotating frame.

[0008] The present application has the following advantages: The pressing tool in the present application is arranged on the rotating frame, so when the rotating frame rotates, the pressing tool can rotate as well, therefore, when the position of the pressing tool on the rotating frame is offset from the rotation center of the rotating frame in the vertical direction, the rotating frame can make the pressing tool relative to different parts of the supporting surface, and at this time, the adjustment path of the pressing tool is circular. The pressing tool in the present application can slide along the rotating frame, that is, at this time, the pressing tool can move along the radial direction of the circular adjustment path, therefore, when the constant temperature platform in the present application is used, the pressing tool can be relative to different positions of the supporting surface by sliding the pressing tool and rotating the rotating frame, so that different positions of the small power device to be tested can be fixed, which is simple to operate, and the adjustment range of the pressing tool is larger.

[0009] Further, the cross section of the workbench along the horizontal direction is circular.

[0010] The present application has the following advantages: in the present application, the shape of the workbench is more close to the movement path of the pressing tool when the rotating frame rotates, so the space below the pressing tool can be more fully utilized, a larger supporting surface can be formed, and small power devices with larger size or more in number can be installed.

[0011] Further, the rotating frame comprises a vertical column and at least two horizontal parts, the rotating frame is provided with at least two strip-shaped grooves, the strip-shaped grooves correspond to the horizontal parts one by one, and the pressing tool can be installed into any strip-shaped groove.

[0012] The present application has the following advantages: in actual implementation, the pressing tool can be installed into the corresponding strip-shaped groove according to the position of the small power device to be tested, so that the pressing tool can be quickly aligned with the small power device to be tested.

[0013] Further, there are at least two pressing tools, and each strip-shaped groove is provided with at least one pressing tool.

[0014] The beneficial effects of the scheme are that the number of pressing tools is more, and one pressing tool can be aligned with the small power device to be tested by sliding the pressing tool slightly or rotating the rotating frame slightly without disassembling and assembling the pressing tool, and the operation is simpler. Meanwhile, the multiple pressing tools can fix multiple small power devices at the same time, or when the size of the small power device is larger, the multiple pressing tools can better fix the small power device.

[0015] Further, two lateral parts are arranged, and the two lateral parts are arranged in a cross shape, and the strip-shaped grooves on the two lateral parts are communicated with each other at the intersection position of the two lateral parts.

[0016] The beneficial effects of the scheme are that the length of the strip-shaped groove is larger, and the pressing tool can be adjusted in a larger range. Secondly, when the rotating frame is rotated by an angle smaller than 90°, the pressing tool can be quickly slid to the position opposite to the small power device by cooperating with the lateral sliding pressing tool, and the fixing speed is further improved.

[0017] Further, the pressing tool comprises an inner cylinder and an outer cylinder, and the inner cylinder is located inside the inner cylinder and can be extended from the outer cylinder.

[0018] The beneficial effects of the scheme are that when the power device needs to be fixed, the inner cylinder can be quickly fixed by being slid downward relative to the outer cylinder, and the operation is simple.

[0019] Further, the pressing tool further comprises a limiting cylinder, the lower end of the limiting cylinder is located between the inner cylinder and the outer cylinder, the upper end of the limiting cylinder extends to the outside of the outer cylinder, the limiting cylinder is provided with a longitudinal groove, the longitudinal groove extends along the axial direction of the inner cylinder, the upper part and the lower part of the longitudinal groove are communicated with the limiting groove, the upper part of the inner cylinder is fixed with a sliding block which can slide along the longitudinal groove and the limiting groove, the inner wall of the outer cylinder is provided with a threaded groove, and the side of the sliding block away from the inner cylinder is located in the threaded groove and can slide along the threaded groove.

[0020] The beneficial effects of the scheme are that the outer cylinder is rotated to make the sliding block slide along the longitudinal groove, the inner cylinder is slid downward relative to the outer cylinder to fix the power device. When the outer cylinder is slid upward, the inner cylinder is rotated relative to the outer cylinder after the sliding block is slid to the position aligned with the limiting groove in the upper part, so that the sliding block is slid into the limiting groove in the upper part, and at this time, the inner cylinder cannot be slid downward relative to the outer cylinder due to the blocking of the side wall of the limiting groove, so that the distance between the inner cylinder and the workbench is larger, and the power device to be detected is more convenient to be placed.

[0021] Further, the lower end of the inner cylinder is fixed with a sleeve-shaped buffer pad.

[0022] The beneficial effects of the present scheme are that when the buffer pad in the present scheme is subjected to greater pressure, the side wall will be concave inward or convex outward, so that the height of the buffer pad can be reduced, further reducing the pressure between the buffer pad and the power device. Compared with directly using sponge and other materials with greater elasticity and more flexibility, the buffer pad in the present scheme can provide greater force for the fixation of the power device, thereby improving the fixation effect of the power device. Compared with directly using rubber and other materials with relatively small elasticity, the buffer pad in the present scheme can provide a better buffering effect, further avoiding deformation or damage of the power device.

[0023] Further, the constant temperature piece comprises a spiral flow channel, a projection of any part of the flow channel along the vertical direction is a circular arc, an inlet is arranged on the inner periphery of the flow channel, and an outlet is arranged on the outer periphery of the flow channel.

[0024] The beneficial effects of the present scheme are that the flow channel is smooth, the flow rate of the fluid is uniform at each part of the flow channel, the internal flow resistance is reduced, the heat dissipation area is increased, the pressure drop is reduced, and the temperature of each part of the support surface is more uniform.

[0025] Further, the flow channel is higher at the end close to the inlet than at the end close to the outlet.

[0026] The beneficial effects of the present scheme are that through testing, the temperature of each part of the support surface in the present scheme is more uniform, and the constant temperature effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a perspective view of an embodiment of the present application; Figure 2 is a front view of a constant temperature piece in an embodiment of the present application; Figure 3 is a perspective view of Figure 2 ; Figure 4 is a perspective view of a pressing tool in Figure 1 ; Figure 5 is a perspective view of Figure 4 ; Figure 6 is a schematic view of the installation of an inner cylinder and an outer cylinder; Figure 4 is a schematic view of the installation of an inner cylinder and a sleeve.DETAILED DESCRIPTION

[0028] The following will be further described in detail through specific embodiments: The reference signs in the drawings of the specification include: a shell 1, a constant temperature piece 2, a water inlet pipe 21, a water outlet pipe 22, a clamping groove 23, an outer cylinder 3, a threaded groove 31, a longitudinal groove 32, a limiting groove 33, an inner cylinder 4, a sliding block 41, a buffer pad 5, a sleeve 6, a vertical column 7, a transverse part 8, and a strip-shaped groove 81.

[0029] EMBODIMENT The embodiment is basically as Figure 1 As shown in the figure, a small power device thermal resistance test constant temperature table comprises a workbench, a constant temperature piece 2, a rotating frame and four pressing devices. The workbench comprises a shell 1 and the constant temperature piece 2. The constant temperature piece 2 is internally provided with a spiral flow channel. The projection of any part of the flow channel along the vertical direction is a circular arc. Adjacent parts of the spiral flow channel are separated by a thin plate to increase the area of the flow channel and improve the constant temperature effect. The inner periphery of the flow channel is provided with an inlet, and the outer periphery is provided with an outlet. One end of the flow channel close to the inlet is higher than the other end close to the outlet. The inlet in the embodiment is communicated with a water inlet pipe 21, and the outlet is communicated with a water outlet pipe 22. The cross section of the shell 1 along the horizontal direction is circular. The shell 1 is open downward and covers the constant temperature piece 2. The side wall of the shell 1 is attached to the constant temperature piece 2. The top of the shell 1 forms a supporting surface. The top of the constant temperature piece 2 is provided with a clamping groove 23. The inner wall of the top of the shell 1 is welded with a clamping block. After the shell 1 covers the constant temperature piece 2, the clamping block is opposite to and located in the clamping groove 23, so that the shell 1 and the constant temperature piece 2 in the embodiment cannot rotate relative to each other.

[0030] The rotating frame comprises four vertical columns 7 and two horizontal parts 8. The four vertical columns 7 are uniformly distributed along the circumference of the outer periphery of the shell 1. The vertical column 7 close to the side wall of the shell 1 is attached to the shell 1. The two horizontal parts 8 are cross-shaped and cross each other. The ends of the horizontal parts 8 are welded with the four vertical columns 7 respectively. Therefore, the shell 1 in the scheme limits the four vertical columns 7, so that the rotating frame can rotate relative to the shell 1 and cannot horizontally translate. The two horizontal parts 8 are both provided with a strip-shaped groove 81 extending along the length direction of the horizontal part 8. The two strip-shaped grooves 81 are communicated with each other at the position where the two horizontal parts 8 cross each other. The vertical cross section of the strip-shaped groove 81 is an I-shaped. The strip-shaped groove 81 penetrates the horizontal part 8 along the vertical direction.

[0031] Each strip-shaped groove 81 is provided with two pressing devices, and the two pressing devices are located at the two ends of the strip-shaped groove 81 respectively. The pressing device comprises an outer cylinder 3, an inner cylinder 4 and a sleeve 6. The upper part of the outer cylinder 3 is provided with an annular groove. The groove is matched with the I-shaped strip-shaped groove 81 to ensure that the outer cylinder 3 slides along the strip-shaped groove 81 without vertically moving relative to the vertical support. The outer diameter of the inner cylinder 4 is smaller than the inner diameter of the outer cylinder 3, and the inner cylinder 4 is located inside the outer cylinder 3. The lower end of the inner cylinder 4 extends below the outer cylinder 3. The lower end of the inner cylinder 4 is glued with a sleeve-shaped buffer pad 5. The buffer pad 5 is made of rubber material, and the lower end of the buffer pad 5 is located below the inner cylinder 4.

[0032] The lower part of the sleeve 6 is located between the inner cylinder 4 and the outer cylinder 3, and the upper end extends above the outer cylinder 3. The sleeve 6 is provided with two longitudinal grooves 32 extending along the axial direction of the sleeve 6, and the two longitudinal grooves 32 are respectively arranged on the two sides of the sleeve 6. The upper part and the lower part of the longitudinal groove 32 are both communicated with the limiting groove 33. The inner wall of the inner cylinder 4 is fixed with two sliding blocks 41, and the ends of the two sliding blocks 41 away from the outer cylinder 3 respectively pass through the two longitudinal grooves 32 and can slide along the longitudinal grooves 32 and the limiting grooves 33.

[0033] The inner wall of the outer cylinder 3 is provided with two screw grooves 31, and the ends of the two sliding blocks 41 extending to the outside of the sleeve 6 are respectively in sliding fit with the two screw grooves 31, so that when the outer cylinder 3 rotates relative to the sleeve 6, the sliding blocks 41 slide along the longitudinal grooves 32 and the limiting grooves 33 under the action of the longitudinal grooves 32, and the automatic upward or downward sliding of the inner cylinder 4 is realized.

[0034] The specific implementation process is as follows: Before testing, the heat preservation fluid is introduced into the flow channel through the water inlet pipe 21. In this embodiment, hot water is taken as the heat preservation fluid. The hot water enters the flow channel from the inlet, flows along the flow channel, and finally flows out from the outlet through the water outlet pipe 22. The heat in the hot water is transmitted to the support surface through the constant temperature piece 2, so that the support surface maintains a certain temperature.

[0035] During testing, the small power device to be tested is placed on the support surface. Then, according to the position of the small power device, the pressing tool closest to the small power device is selected as the object for fixing the small power device. Then, the pressing tool is slid to the upper side of the small power device by combining the two adjustment modes of rotating the rotating frame and sliding the pressing tool along the strip-shaped groove 81. Finally, the outer cylinder 3 is rotated, and the inner cylinder 4 is slid downward until the buffer pad 5 presses on the power device, so that the power device is fixed.

[0036] After testing, the outer cylinder 3 is rotated in the opposite direction relative to the inner cylinder 4, so that the inner cylinder 4 slides upward relative to the outer cylinder 3, and the small power device is released. During the entire process of fixing and releasing the small power device, the inner cylinder 4 in the scheme does not rotate, which can avoid the rotation of the buffer pad 5 and the small power device during the process of contacting and continuing to press the small power device, so that the small power device moves with the buffer pad 5 and rubs against the support surface.

[0037] The above is only an embodiment of the present application, and the specific technical solutions and / or common knowledge of the scheme are not described in detail. It should be noted that for those skilled in the art, without departing from the technical solutions of the present application, some modifications and improvements can be made, which should be regarded as the protection scope of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A low-power device thermal resistance test constant temperature platform, characterized in that: The device comprises a workbench, a constant temperature part, a rotating frame and a pressing device, the workbench is provided with a supporting surface, the constant temperature part is arranged below the supporting surface, the rotating frame can rotate relative to the supporting surface, and the pressing device is arranged on the rotating frame and can slide along the transverse direction relative to the rotating frame.

2. The constant temperature platform for testing the thermal resistance of low power devices according to claim 1, characterized in that: The cross section of the workbench along the horizontal direction is circular.

3. The constant temperature platform for testing the thermal resistance of low power devices according to claim 2, wherein: The rotating frame comprises a vertical column and at least two horizontal parts, the rotating frame is provided with at least two strip-shaped grooves, the strip-shaped grooves correspond to the horizontal parts one by one, and the pressing device can be installed into any strip-shaped groove.

4. The constant temperature platform for testing the thermal resistance of low power devices according to claim 3, wherein: The device is provided with at least two pressing devices, and each strip-shaped groove is provided with at least one pressing device.

5. The constant temperature platform for testing the thermal resistance of low power devices according to claim 4, wherein: The horizontal parts are two, and the two horizontal parts are distributed in a cross shape, and the strip-shaped grooves on the two horizontal parts are communicated with each other at the intersection position of the two horizontal parts.

6. The constant temperature platform for testing the thermal resistance of low power devices of claim 1, wherein: The pressing device comprises an inner cylinder and an outer cylinder, the inner cylinder is located inside the inner cylinder and can be extended from the outer cylinder.

7. The constant temperature platform for testing the thermal resistance of low power devices according to claim 6, wherein: The pressing device further comprises a limiting cylinder, the lower end of the limiting cylinder is located between the inner cylinder and the outer cylinder, the upper end of the limiting cylinder extends to the outside of the outer cylinder, the limiting cylinder is provided with a longitudinal groove, the longitudinal groove extends along the axial direction of the inner cylinder, the upper part and the lower part of the longitudinal groove are communicated with the limiting groove, the upper part of the inner barrel is fixed with a sliding block which can slide along the longitudinal groove and the limiting groove, the inner wall of the outer cylinder is provided with a threaded groove, and the side of the sliding block away from the inner cylinder is located in the threaded groove and can slide along the threaded groove.

8. The constant temperature platform for testing the thermal resistance of low power devices according to claim 6 or 7, characterized in that: The lower end of the inner cylinder is fixed with a sleeve-shaped buffer pad.

9. The constant temperature platform for testing the thermal resistance of low power devices of claim 1 wherein: The constant temperature part comprises a spiral flow channel, the projection of any part of the flow channel along the vertical direction is a circular arc, the inner wall of the flow channel is provided with an inlet, and the outer wall of the flow channel is provided with an outlet.

10. The constant temperature platform for testing the thermal resistance of low power devices of claim 9, wherein: The end of the flow channel close to the inlet is higher than the end close to the outlet.

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