A patch power device thermal resistance test fixing system

Abstract

The utility model relates to the technical field of thermal resistance test, specifically disclose a kind of patch type power device thermal resistance test fixed system. Including workbench, fixed unit and conducting unit, fixed unit is located at the top of workbench, and fixed unit includes press, and press can be adjusted to the side close to workbench;Conducting unit includes conducting sheet, and conducting sheet is located at the lateral of workbench and can slide along the width direction of workbench.The patch type power device thermal resistance test fixed system of the utility model improves the fixed effect to power device and facilitates adjustment conducting structure position, to make conducting structure fast and pin alignment, improve test efficiency.

Description

Technical Field

[0001] This utility model relates to the field of thermal resistance testing technology, specifically to a surface mount power device thermal resistance testing fixing system. Background Technology

[0002] As power devices develop towards higher power density, higher integration, and miniaturization, the heat generated per unit volume increases significantly, while the heat dissipation space is continuously compressed, leading to a rapid increase in junction temperature. This greatly affects the performance and lifespan of power devices. Therefore, power devices need to undergo thermal resistance testing after assembly.

[0003] Thermal resistance testing of power devices quantifies the ease with which heat is conducted from the chip junction to the casing or environment, and is a key parameter for evaluating the thermal management capabilities of power devices. The thermal resistance test requires first fixing the power device in place, then powering it through its pins and performing the test.

[0004] Currently, although there exists a flip-chip thermal resistance test fixture disclosed in application number CN202011608779.7, it is equipped with a base, two support rods, a copper block, a support plate frame, and a conductive positioning mechanism; the copper block is fixedly connected to the base, and the two support rods are vertically fixed to the base on both sides of the copper block; the support plate frame passes through and slides back and forth along the two support rods; the conductive positioning mechanism is slidably connected in the support plate frame.

[0005] Although the aforementioned thermal resistance test fixture uses a chip positioning plate to limit the chip's position, it primarily relies on a conductive slider sliding downwards to press and fix the chip. However, the pin positions of chips of different specifications and models vary. Therefore, before sliding the conductive slider downwards, it needs to be moved laterally to position it above the pins to ensure alignment and enable chip power-on. However, in practice, because the conductive slider is located above the chip, and the power devices on the chip are relatively small, there are instances where the conductive slider cannot align with the pins after sliding downwards. Sliding the conductive slider upwards and then adjusting it further would significantly reduce testing efficiency; while directly adjusting the conductive slider could easily cause it to contact the chip and displace it. Utility Model Content

[0006] The present invention aims to provide a surface-mount power device thermal resistance testing and fixing system to improve the fixing effect of power devices and facilitate the adjustment of the position of the conductive structure, so as to quickly align the conductive structure with the pins and improve testing efficiency.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a surface mount power device thermal resistance testing and fixing system, comprising a worktable, a fixing unit and a conductive unit, wherein the fixing unit is disposed above the worktable and includes a pressure fixture that can be adjusted toward the side closer to the worktable; the conductive unit includes a conductive sheet that is located on the side of the worktable and can slide along the width direction of the worktable.

[0008] The beneficial effects of this plan are: 1. In this solution, the fixing unit is set independently of the conductive unit. When adjusting the position of the conductive sheet, the pressure plate can slide out and press down to fix the power device, so that the power device will not shift when the conductive sheet is adjusted, which facilitates the alignment of the conductive sheet with the pins of the power device.

[0009] 2. In this solution, the conductive sheet is located on the side of the workbench. After the power device is fixed by the clamp, the conductive sheet can be aligned with the power device by sliding it horizontally, without having to slide it downwards. Therefore, even if the conductive sheet is not slid to the position opposite the pin in one go, it can continue to slide until it is aligned with the pin. Thus, the conductive sheet adjustment in this solution is more convenient and faster, and the testing efficiency is higher.

[0010] Furthermore, the fixing unit includes a longitudinal support, which is located above the worktable and can slide along the width direction of the worktable. The pressure fixture is mounted on the longitudinal support and can be adjusted downward along the longitudinal support.

[0011] The beneficial effects of this solution are as follows: the longitudinal support can support the pressure fixture, allowing the pressure fixture to slide upward a greater distance when removing or placing the power device to be tested, thereby leaving enough space between the pressure fixture and the worktable for removing or placing the power device, making the operation more convenient.

[0012] The pressure fixture is mounted on the longitudinal support. Therefore, the longitudinal support can slide along the width of the worktable, which will cause the pressure fixture to slide along the width of the worktable. In other words, the pressure fixture in this solution can also be adjusted in position along the width of the worktable to fix the middle of the power device as much as possible and improve the fixing effect of the power device.

[0013] Furthermore, the press is slidably fitted with the longitudinal support along the length of the longitudinal support.

[0014] The beneficial effects of this solution are as follows: the pressure fixture in this solution can also be adjusted along the length of the worktable, further expanding the adjustable range of the pressure fixture, and further ensuring that the pressure fixture can fix the middle part of the power device, resulting in a better fixing effect.

[0015] Furthermore, a cushioning pad is fixed to the bottom of the press.

[0016] The beneficial effects of this solution are: the buffer pad can protect the power device and prevent the pressure between the pressure plate and the power device from being too large due to excessive downward sliding distance, which could cause deformation or even damage to the power device.

[0017] Furthermore, the cushioning pad is sleeve-shaped.

[0018] The beneficial effects of this solution are as follows: When the buffer pad is subjected to significant pressure, its sidewalls will concave or convex, thereby reducing the height of the buffer pad and further decreasing the pressure between the buffer pad and the power device. Compared to directly using materials with greater elasticity and softness, such as sponge, the buffer pad in this solution can provide greater force for fixing the power device, thus improving the fixing effect. Compared to directly using materials with relatively low elasticity, such as rubber, the buffer pad in this solution can provide a better cushioning effect, further preventing deformation or damage to the power device.

[0019] Furthermore, the press includes an inner cylinder and an outer cylinder, with the inner cylinder located inside the inner cylinder and extending out from the outer cylinder.

[0020] The advantages of this solution are: when it is necessary to fix the power device, the inner cylinder can be slid down relative to the outer cylinder to quickly achieve fixation, and the operation is simple.

[0021] Furthermore, the press also includes a sleeve, the lower end of which is located between the inner cylinder and the outer cylinder, and the upper end extends to the outside of the outer cylinder. The sleeve is provided with a longitudinal groove, which extends along the axial direction of the inner cylinder. The upper and lower parts of the longitudinal groove are connected to a limiting groove. The upper part of the inner cylinder is fixed with a slider that can slide along the longitudinal groove and the limiting groove. The inner wall of the outer cylinder is provided with a threaded groove. The side of the slider away from the inner cylinder is located in the threaded groove and can slide along the threaded groove.

[0022] The beneficial effects of this solution are as follows: Rotating the outer cylinder allows the slider to slide along the longitudinal groove, causing the inner cylinder to slide downwards relative to the outer cylinder, thus fixing the power device. When the outer cylinder slides upwards, once the slider aligns with the upper limiting groove, rotating the inner cylinder relative to the outer cylinder allows the slider to slide into the upper limiting groove. At this point, the slider is blocked by the side wall of the limiting groove, preventing the inner cylinder from sliding downwards relative to the outer cylinder. This maintains a greater distance between the inner cylinder and the worktable, making it easier to place the power device to be tested.

[0023] Furthermore, the conductive unit also includes an L-shaped limiting piece, which is fixed to the conductive piece; the worktable is provided with a through slot for accommodating power devices, and the limiting piece is opposite to the through slot.

[0024] The beneficial effects of this solution are as follows: the limiting piece in this solution is located below the power device after the power device is placed. After the power device is fixed by the pressure fixture, the power device can also limit the conductive unit, so that the conductive unit will not be tilted during the sliding process, thereby ensuring that the conductive unit can contact the pin of the power device.

[0025] Furthermore, a guide groove is provided on the worktable along the width direction, and a guide block is fixed on the conductive sheet, wherein the guide block slides in conjunction with the guide groove.

[0026] The beneficial effects of this solution are: the guide block and guide groove work together to guide the sliding of the conductive sheet, further preventing the conductive unit from tilting.

[0027] Furthermore, the limiting piece is a conductive part.

[0028] The beneficial effects of this solution are as follows: the limiting plate in this solution can also conduct electricity. When the pin of the power device is located at the bottom of the power device, the power device can also be powered through the limiting plate. At this time, the power device is pressed on the limiting plate, and the pin can make better contact with the conductive unit. Attached Figure Description

[0029] Figure 1 This is a perspective view of an embodiment of the present utility model; Figure 2 for Figure 1 A three-dimensional view of the intermediate pressure fixture; Figure 3 for Figure 2 Installation diagram of the inner and outer cylinders; Figure 4 for Figure 2 A schematic diagram of the installation of the inner cylinder and the sleeve; Figure 5 This is a perspective view of the conductive unit in an embodiment of this utility model. Detailed Implementation

[0030] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: workbench 1, column 11, transverse track 12, guide groove 13, longitudinal support 2, strip groove 21, outer cylinder 3, threaded groove 31, longitudinal groove 32, limiting groove 33, inner cylinder 4, slider 41, buffer pad 5, conductive sheet 6, guide block 61, limiting sheet 62, sleeve 7.

[0031] Example The implementation examples are basically as follows Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a surface-mount power device thermal resistance testing and fixing system includes a worktable 1, a fixing unit, and a conductive unit. The worktable 1 is U-shaped, with through slots formed on the worktable 1 to accommodate the power device. Vertical columns 11 are provided at each of the four corners of the worktable 1. Two horizontal rails 12 are provided above the columns 11, extending along the width of the worktable 1. The two horizontal rails 12 on the left are connected to the tops of the two columns 11 on the left, and the two horizontal rails 12 on the right are connected to the tops of the two columns 11 on the right. Specifically, in this embodiment, the columns 11 are welded to the worktable 1, and the columns 11 are welded to the horizontal rails 12.

[0032] The fixing unit includes a longitudinal support 2 and a press. The longitudinal support 2 extends along the length of the worktable 1, and its left and right ends are respectively slidably engaged with two transverse rails 12. The longitudinal support 2 is provided with a strip groove 21, which extends along the length of the longitudinal support 2, and the cross-section of the strip groove 21 is I-shaped.

[0033] The press includes an outer cylinder 3, an inner cylinder 4, and a sleeve 7. The upper part of the outer cylinder 3 is provided with an annular groove, which cooperates with an I-shaped strip groove 21 to ensure that the outer cylinder 3 slides along the strip groove 21 without moving vertically relative to the longitudinal support 2. 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 to the bottom of the outer cylinder 3. A sleeve-shaped buffer pad 5 is glued to the lower end of the inner cylinder 4. The buffer pad 5 is made of rubber and its lower end is located below the inner cylinder 4.

[0034] The lower part of the sleeve 7 is located between the inner cylinder 4 and the outer cylinder 3, and the upper end extends above the outer cylinder 3. The sleeve 7 is provided with two longitudinal grooves 32, which extend along the axial direction of the sleeve 7 and are respectively located on both sides of the sleeve 7. The upper and lower parts of the longitudinal grooves 32 are connected to the limiting grooves 33. Two sliders 41 are fixed to the inner wall of the inner cylinder 4. The ends of the two sliders 41 away from the outer cylinder 3 pass through the two longitudinal grooves 32 and can slide along the longitudinal grooves 32 and the limiting grooves 33.

[0035] The inner wall of the outer cylinder 3 is provided with two threaded grooves 31. Two sliders 41 extend to one end of the sleeve 7 and slide in cooperation with the two threaded grooves 31 respectively. When the outer cylinder 3 rotates relative to the sleeve 7, the sliders 41 slide along the longitudinal groove 32 and the limiting groove 33 under the action of the longitudinal groove 32, so as to realize the automatic upward or downward sliding of the inner cylinder 4.

[0036] The conductive unit has three components, each including a conductive sheet 6 and an L-shaped limiting piece 62. The conductive sheet 6 and the limiting piece 62 are integrally formed and are both made of copper, making the limiting piece 62 a conductive part. A guide groove 13 is provided on the top of the right side wall of the worktable 1 along the width direction of the worktable 1. A guide block 61 slides within the guide groove 13. The guide block 61 is integrally formed with the left side of the conductive sheet 6, and the right end of the conductive sheet 6 extends to the right side of the worktable 1 for easy connection with external electrical wires. The top of the vertical part of the limiting piece 62 is connected to the left end of the conductive sheet 6, and the horizontal part is lower than the conductive sheet 6 and horizontally positioned. At this time, the horizontal part of the limiting piece 62 is opposite to the through groove formed by the worktable 1.

[0037] The specific implementation process is as follows: In this design, the workbench 1 is used in conjunction with existing equipment such as a constant temperature table that has a supporting plane. During use, the supporting plane is opposite to the through slot and is in contact with the bottom of the lateral portion of the limiting plate 62. Initially, the inner cylinder 4 is higher than the workbench 1. During testing, the power device to be tested is placed on the supporting plane, at which point the power device simultaneously falls on the lateral portion of the limiting plate 62.

[0038] Then, by sliding the longitudinal support 2 or sliding the outer cylinder 3 along the strip groove 21, the inner cylinder 4 is aligned with the middle of the power device. Then, rotate the outer cylinder 3 to make the inner cylinder 4 slide downwards until the buffer pad 5 presses on the power device to fix it. At this time, the lateral part of the limiting piece 62 is in contact with the bottom of the power device. When the pin of the power device is at the bottom, the contact effect between the limiting piece 62 and the pin is better; when the pin is on the side of the power device, the power device should be placed with the pin facing the vertical part of the limiting piece 62.

[0039] When the conductive unit deviates from the pin of the power device, the position of the limiting piece 62 can be quickly adjusted by sliding the conductive piece 6 laterally, which is simple to operate. After the test is completed, the inner cylinder 4 can be rotated in the opposite direction to reset it upwards, release the power device, and then remove the power device, quickly ending the test. Throughout the entire process of fixing and releasing the power device, the inner cylinder 4 in this solution will not rotate, which can prevent the buffer pad 5 from rotating during contact with the power device and continued pressing, causing the power device to move with the buffer pad 5 and rub against the support surface.

[0040] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A surface-mount power device thermal resistance testing and fixing system, characterized in that: The device includes a worktable, a fixing unit, and a conductive unit. The fixing unit is located above the worktable and includes a pressure fixture that can be adjusted to the side closer to the worktable. The conductive unit includes a conductive sheet located to the side of the worktable and can slide along the width of the worktable.

2. The surface mount power device thermal resistance testing and fixing system according to claim 1, characterized in that: The fixing unit includes a longitudinal support, which is located above the worktable and can slide along the width of the worktable. The press is mounted on the longitudinal support and can be adjusted downward along the longitudinal support.

3. The surface mount power device thermal resistance testing and fixing system according to claim 2, characterized in that: The press is slidably fitted with the longitudinal support along the length of the longitudinal support.

4. The surface mount power device thermal resistance testing and fixing system according to claim 1, characterized in that: A cushioning pad is fixed to the bottom of the press.

5. The surface mount power device thermal resistance testing and fixing system according to claim 4, characterized in that: The cushioning pad is sleeve-shaped.

6. A surface-mount power device thermal resistance testing and fixing system according to claim 4 or 5, characterized in that: The press includes an inner cylinder and an outer cylinder, with the inner cylinder located inside the outer cylinder and extending out from the outer cylinder.

7. The surface mount power device thermal resistance testing and fixing system according to claim 6, characterized in that: The press also includes a sleeve, the lower end of which is located between the inner cylinder and the outer cylinder, and the upper end extends to the outside of the outer cylinder. The sleeve is provided with a longitudinal groove that extends along the axial direction of the inner cylinder. The upper and lower parts of the longitudinal groove are connected to a limiting groove. A slider that can slide along the longitudinal groove and the limiting groove is fixed on the upper part of the inner cylinder. The inner wall of the outer cylinder is provided with a threaded groove. The side of the slider away from the inner cylinder is located in the threaded groove and can slide along the threaded groove.

8. The surface mount power device thermal resistance testing and fixing system according to claim 1, characterized in that: The conductive unit also includes an L-shaped limiting piece, which is fixed to the conductive piece; the worktable is provided with a through slot for accommodating power devices, and the limiting piece is opposite to the through slot.

9. The surface mount power device thermal resistance testing and fixing system according to claim 8, characterized in that: A guide groove is provided on the worktable along the width direction, and a guide block is fixed on the conductive sheet. The guide block slides in conjunction with the guide groove.

10. A surface-mount power device thermal resistance testing and fixing system according to claim 8, characterized in that: The limiting piece is a conductive part.

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