A power module test system

Abstract

This invention provides a power module testing system, belonging to the field of power module manufacturing technology. The system includes a test fixture, a contact detection device, a test structure, and a controller. The test fixture has placement positions for power modules, and each placement position has multiple double-contact conductive connectors, each including an independent current application terminal and a voltage sensing terminal. The contact detection device includes a first relay and a low-voltage power supply, with the low-voltage power supply electrically connected to all voltage sensing terminals via the first relay. The test structure is electrically connected to all voltage sensing terminals; the controller is electrically connected to each current application terminal via a second relay. This system can perform contact detection on the power module before testing begins, preventing the power module from being damaged by high voltage during high-voltage testing due to poor contact between the pins and the test fixture, thus protecting the power module.

Description

Technical Field

[0001] This utility model relates to the field of power module manufacturing technology, and in particular to a power module testing system. Background Technology

[0002] In power electronic systems, intelligent power modules (IPMs) are core components, and their packaging reliability plays a crucial role in the lifespan and safety of the equipment. To ensure the quality of IPM modules, current industry standards require that IPM modules undergo insulation withstand voltage testing before leaving the factory to verify whether there are any defects in the molding process. However, existing insulation withstand voltage tests for intelligent power modules do not check the contact between the module pins and the test fixture before testing; instead, high voltage is directly applied between the IPM module pins and the rear heatsink. For devices like IPM modules with multiple rows and pins, the pins may undergo slight deformation after lead cutting and molding, leading to poor contact between some pins and the test fixture. In this case, pins that do not have good contact with the test fixture are easily broken down by high voltage during high-voltage testing. Because the insulation withstand voltage test voltage is generally greater than 1500V, while the chip withstand voltage is usually only 600V or 1200V, if the pins do not have good contact with the test fixture, it is very easy for the chip to break down, which in turn leads to batch testing failures of good products.

[0003] Therefore, it is necessary to improve the existing insulation withstand voltage test method for smart power modules in order to overcome the shortcomings of the existing technology. Utility Model Content

[0004] To overcome the problems existing in related technologies, one of the objectives of this utility model is to provide a power module testing system. This system can perform contact testing on the power module before the test begins, preventing the power module from being damaged by high voltage during high voltage testing due to the pins not making good contact with the test fixture, thereby protecting the power module.

[0005] A power module testing system, comprising:

[0006] A test fixture is provided with a placement position for placing a power module. The placement position is provided with a plurality of double-contact conductive connectors, each of which includes an independent current application terminal and a voltage sensing terminal.

[0007] A contact detection device, comprising a first relay and a low-voltage power supply, wherein the low-voltage power supply is electrically connected to all voltage sensing terminals through the first relay;

[0008] The test structure is electrically connected to all voltage sensing terminals;

[0009] The controller is electrically connected to each of the current application terminals via a second relay.

[0010] In a preferred embodiment of this invention, a display screen is also included, which is electrically connected to the controller.

[0011] In a preferred embodiment of this invention, a sorting machine is further included. The sorting machine is electrically connected to the test structure and is used to screen and detect substandard products.

[0012] In a preferred embodiment of this invention, the sorting machine includes a robotic arm and a screening groove. The screening groove is disposed on one side of the test fixture, and the robotic arm is disposed between the screening groove and the test fixture. The robotic arm is electrically connected to the controller.

[0013] The robotic arm is used to transfer products that fail the test to the screening tank.

[0014] In a preferred embodiment of this invention, a conveyor line is provided below the screening tank, and a weight sensor is provided on the conveyor line.

[0015] In a preferred embodiment of this invention, an alarm device is also included, which is electrically connected to the contact detection device and the controller.

[0016] In a preferred embodiment of this invention, the placement position is provided with two rows of double-contact conductive connectors.

[0017] Each of the two-contact conductive connectors in each column includes an independent current application terminal and a voltage sensing terminal.

[0018] In a preferred embodiment of this invention, the output voltage of the low-voltage power supply is 5V-7V.

[0019] The beneficial effects of this utility model are as follows:

[0020] This utility model provides a power module testing system, which includes a test fixture, a contact detection device, a test structure, and a controller. The test fixture has placement positions for the power module, and multiple double-contact conductive connectors are provided in the placement positions. Each double-contact conductive connector includes an independent current application terminal and a voltage sensing terminal. The contact detection device includes a first relay and a low-voltage power supply. The low-voltage power supply is electrically connected to all voltage sensing terminals through the first relay. The test structure is electrically connected to all voltage sensing terminals. The controller is electrically connected to each current application terminal through a second relay. The system is used as follows: The power module is placed in the placement position of the test fixture. The first relay is turned on to connect the low-voltage power supply, which applies a low-voltage signal to the pins of the power module through the voltage sensing terminals. The controller detects the voltage response of each pin through the test structure to determine whether the pin is making good contact with the double-contact conductive connector. If the contact detection of all pins passes, the low-voltage power supply is disconnected through the first relay, and simultaneously the second relay is controlled to connect the high-voltage power supply of the insulation withstand voltage tester. The insulation withstand voltage tester applies high voltage to the power module through the current application terminals to perform an insulation withstand voltage test. This system ensures that each pin of the power module makes good contact with the dual-contact conductive joint of the test fixture by adding a contact detection step before high-voltage testing. This effectively avoids high-voltage breakdown accidents caused by poor pin contact, thus protecting the power module from damage and improving the safety of the testing process. The system also reduces testing costs by preventing such damage through contact detection. Attached Figure Description

[0021] Figure 1 This is a circuit connection diagram of the power module testing system provided by this utility model;

[0022] Figure 2 This is a schematic diagram of the sorting machine provided by this utility model.

[0023] Figure label:

[0024] 1. Controller; 2. Display screen; 3. Test structure; 4. Sorter; 41. Robotic arm; 42. Screening tank; 43. Conveyor line; 431. Weight sensor; 5. Contact detection device; 51. Low voltage power supply; 52. First relay; 16. Test fixture; 61. Current application terminal; 62. Voltage sensing terminal. Detailed Implementation

[0025] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0026] During the production process, to ensure the quality of IPM modules, current industry standards require that IPM modules undergo insulation withstand voltage testing before leaving the factory to verify whether there are any defects in the molding process. However, existing intelligent power module insulation withstand voltage tests do not check the contact between the module pins and the test fixture before testing; instead, high voltage is directly applied between the IPM module pins and the rear heatsink. For IPM modules, which have multiple rows and pins, the pins may undergo slight deformation after lead cutting and molding, leading to poor contact between some pins and the test fixture. In this case, pins that do not have good contact with the test fixture are easily broken down by high voltage during high-voltage testing. Because the insulation withstand voltage test voltage is generally greater than 1500V, while the chip withstand voltage is usually only 600V or 1200V, if the pins do not have good contact with the test fixture, it is very easy for the chip to break down, which in turn leads to batch testing failures of good products.

[0027] Based on this, this application provides a power module testing system.

[0028] Example 1

[0029] like Figure 1 As shown, this embodiment provides a power module testing system, including:

[0030] The test fixture 16 has a placement position for placing a power module. The placement position has multiple double-contact conductive connectors, each of which includes an independent current application terminal 61 (i.e., force terminal) and a voltage sensing terminal 62 (i.e., sense terminal). The placement position has two rows of double-contact conductive connectors, and each of the double-contact conductive connectors in each row includes an independent current application terminal 61 and a voltage sensing terminal 62.

[0031] The contact detection device 5 includes a first relay 52 and a low-voltage power supply 51. The low-voltage power supply 51 is electrically connected to all voltage sensing terminals 62 through the first relay 52. ​​More specifically, the output voltage of the low-voltage power supply 51 is 5V-7V.

[0032] Test structure 3, which is electrically connected to all voltage sensing terminals 62;

[0033] The controller 1 is electrically connected to each of the current application terminals 61 via a second relay.

[0034] Specifically, the system also includes a display screen 2, which is electrically connected to the controller 1.

[0035] The test structure 3 of this application is used to perform insulation withstand voltage tests. Test structure 3 is electrically connected to all voltage sensing terminals 62, enabling the application of high voltage to the power module for insulation withstand voltage testing after successful contact detection. Test structure 3 includes an insulation withstand voltage tester, the output of which is connected to the pins of the power module via a current application terminal 61, for applying a high voltage test signal after successful contact detection.

[0036] Controller 1 is the control core of the testing system, used to coordinate the entire testing process. Controller 1 is electrically connected to each current application terminal 61 via a second relay. Controller 1 can control the on / off state of the first relay 52 and the second relay, thereby achieving automated control of contact detection and high-voltage testing. Controller 1 is also electrically connected to display screen 2 to display the test status and results. Display screen 2 is electrically connected to controller 1 to display various information during the testing process. Display screen 2 can display the current test status in real time, including whether contact detection has started, whether the contact detection has passed, whether high-voltage testing has started, and whether the test results are qualified. The addition of display screen 2 allows operators to intuitively understand the test progress and results, improving the convenience and transparency of the test.

[0037] The system is used as follows:

[0038] Place the power module in the placement position of test fixture 16, ensuring that the pins of the power module are in contact with the dual-contact conductive connector.

[0039] Controller 1 controls the first relay 52 to connect the low-voltage power supply 51. The low-voltage power supply 51 applies a low-voltage signal (5V-7V) to the pins of the power module through the voltage sensing terminal 62. Controller 1 detects the voltage response of each pin through the test structure 3 to determine whether the pin is in good contact with the dual-contact conductive connector. Display screen 2 displays the contact detection status and results.

[0040] If all pin contact tests pass, controller 1 controls the first relay 52 to disconnect the low-voltage power supply 51, and simultaneously controls the second relay to connect the high-voltage power supply to the insulation withstand voltage tester. The insulation withstand voltage tester applies high voltage to the power module through the current application terminal 61 to perform the insulation withstand voltage test. Display screen 2 shows the status and results of the high-voltage test.

[0041] Test structure 3 feeds back the test results to controller 1. Controller 1 determines whether the power module is qualified based on the test results and displays the final test results on display screen 2.

[0042] This system ensures that each pin of the power module makes good contact with the dual-contact conductive joint of the test fixture 16 by adding a contact detection step before high-voltage testing. This effectively avoids high-voltage breakdown accidents caused by poor pin contact, thereby protecting the power module from damage and improving the safety of the testing process.

[0043] During testing, the Kelvin detection method is employed to reduce the impact of contact resistance on the test results by separating the current loop and the voltage detection loop. This detection method can more accurately determine whether the pin is making good contact with the test fixture 16, thereby improving the accuracy of the test results.

[0044] It also includes an alarm device, which is electrically connected to the contact detection device 5 and the controller 1.

[0045] The alarm device is electrically connected to the contact detection device 5 and the controller 1, and is used to issue an alarm when an abnormal situation is detected. The alarm device includes an audible and visual alarm, which can trigger an alarm in the following situations:

[0046] When contact detection reveals poor contact between the pin and test fixture 16;

[0047] When leakage current exceeding the set threshold is detected during high-voltage testing;

[0048] When other abnormal situations occur during the test.

[0049] The addition of alarm devices can promptly alert operators to handle abnormal situations, preventing equipment damage or safety accidents caused by failure to detect faults in a timely manner.

[0050] Example 2

[0051] This embodiment is an improvement on embodiment 1.

[0052] like Figures 1-2 As shown, in a preferred embodiment, the system further includes a sorting machine 4, which is electrically connected to the test structure 3, and is used to screen out products that fail to meet the standards.

[0053] Furthermore, the sorting machine 4 includes a robotic arm 41 and a screening tank 42. The screening tank 42 is disposed on one side of the test fixture 16, and the robotic arm 41 is disposed between the screening tank 42 and the test fixture 16. The robotic arm 41 is electrically connected to the controller 11.

[0054] The robotic arm 41 is used to transfer products that fail the test from the test fixture 16 to the screening tank 42.

[0055] More specifically, a conveyor line 43 is provided below the screening tank 42, and a weight sensor 431 is provided on the conveyor line 43.

[0056] During operation, if the controller 11 determines that the power module fails the test, it sends an action command to the robotic arm 41. Upon receiving the command, the robotic arm 41 starts and moves to a designated position above the test fixture 16. The gripping device on the robotic arm 41 (such as a vacuum suction cup or mechanical gripper) accurately grips the substandard product from the test fixture 16 according to the command from the controller 11. The gripping device is designed to ensure a secure grip on the power module while avoiding damage. After gripping the substandard product, the robotic arm 41 transfers the product to the screening tank 42 according to a preset path and speed. Upon reaching the screening tank 42, the robotic arm 41 places the substandard product into the screening tank 42. The screening tank 42 receives the substandard product placed by the robotic arm 41. The screening tank 42 is designed to accommodate a certain number of products as needed for convenient subsequent centralized processing. When the number of products in the screening tank reaches a preset threshold, or when the weight sensor detects that the total weight of the products in the screening tank reaches a set value, the controller 1 sends a start command to the conveyor line. Once the conveyor line receives the start command, it begins operation. The conveyor line transports non-conforming products from the screening tank to designated locations, such as the non-conforming product collection area or subsequent processing steps.

[0057] During operation, if the controller determines that the power module fails the test, it sends a motion command to the robotic arm. Upon receiving the command, the robotic arm starts and moves to a designated position above the test fixture. The gripping device on the robotic arm (such as a vacuum suction cup or mechanical gripper) accurately grasps the substandard product from the test fixture according to the controller's instructions. The gripping device is designed to ensure a secure grip on the power module while avoiding damage. After grasping the substandard product, the robotic arm transfers it to the screening tank according to a preset path and speed. Once above the screening tank, the robotic arm places the substandard product into it. The screening tank receives the substandard product placed by the robotic arm. The screening tank can be designed to accommodate a certain number of products as needed for convenient subsequent centralized processing.

[0058] When the number of products in the screening tank reaches a preset threshold, or when the weight sensor detects that the total weight of the products in the screening tank reaches a set value, the controller sends a start command to the conveyor line. Upon receiving the start command, the conveyor line begins operation. The conveyor line transports the non-conforming products in the screening tank to designated locations, such as the non-conforming product collection area or subsequent processing steps.

[0059] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0060] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0061] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A power module testing system, characterized in that, include: A test fixture is provided with a placement position for placing a power module. The placement position is provided with a plurality of double-contact conductive connectors, each of which includes an independent current application terminal and a voltage sensing terminal. A contact detection device, comprising a first relay and a low-voltage power supply, wherein the low-voltage power supply is electrically connected to all voltage sensing terminals through the first relay; The test structure is electrically connected to all voltage sensing terminals; The controller is electrically connected to each of the current application terminals via a second relay.

2. The power module testing system according to claim 1, characterized in that: The power module testing system also includes a display screen, which is electrically connected to the controller.

3. The power module testing system according to claim 1, characterized in that: The power module testing system also includes a sorting machine, which is electrically connected to the testing structure and is used to screen and detect substandard products.

4. The power module testing system according to claim 3, characterized in that: The sorting machine includes a robotic arm and a screening tank. The screening tank is disposed on one side of the test fixture, and the robotic arm is disposed between the screening tank and the test fixture. The robotic arm is electrically connected to the controller. The robotic arm is used to transfer products that fail the test to the screening tank.

5. The power module testing system according to claim 4, characterized in that: A conveyor line is installed below the screening tank, and a weight sensor is installed on the conveyor line.

6. The power module testing system according to any one of claims 1-5, characterized in that: The power module testing system also includes an alarm device, which is electrically connected to the contact detection device and the controller.

7. The power module testing system according to claim 1, characterized in that: The placement position is provided with two rows of double-contact conductive connectors, and each double-contact conductive connector in each row includes an independent current application terminal and a voltage sensing terminal.

8. The power module testing system according to any one of claims 1-5, characterized in that: The output voltage of the low-voltage power supply is 5V-7V.

Images