Discrete power device power cycle test device

Abstract

The utility model relates to a discrete power device power cycle test device comprising one or more rows of test assemblies which are connected in parallel. The testing assembly is provided with one or more testing stations, the testing stations are connected in series, and the testing assembly is configured to test the durability of the power devices installed on the testing stations. Compared with the prior art, the system has the advantages of high efficiency, accuracy, real-time monitoring and modular maintenance.

Description

Technical Field

[0001] The utility model relates to the technical field of semiconductor device detection, in particular to a power cycle test device for discrete power devices. Background Art

[0002] Power semiconductor devices are the core components in applications such as new energy, rail transit, electric vehicles, industrial applications, and household appliances. Especially with the rapid development of new energy electric vehicles, the market for power semiconductor devices has witnessed an explosive growth. Different from the consumer electronics market, due to the characteristics of high working junction temperature, high power density, and high switching frequency, as well as a more severe usage environment, the reliability of vehicle-grade power semiconductor devices is particularly important. Power cycling, as one of the durability tests for power devices, is considered by the industrial and academic communities to be the most important reliability test for evaluating the packaging reliability of power devices.

[0003] Currently, single-channel power cycle test equipment in the industry usually has only one test channel and is suitable for testing single devices. They are usually smaller, easier to operate and maintain, but have limited test capacity.

[0004] CN220105205U discloses a test tooling for power cycling of a half-bridge power module. The test tooling includes a cooling component, which includes a cooling housing with a first station and a second station on its surface for respectively mounting two half-bridge power modules, and a cooling flow channel formed inside the cooling housing; a module fixing component, including a DC bracket and an AC bracket, respectively arranged on both sides of the cooling housing; and a power terminal connection component, including two DC positive busbars, one DC negative busbar, one DC positive transfer busbar, and one DC negative transfer busbar arranged on the DC bracket, and an AC transfer busbar arranged on the AC bracket. However, it can only perform cycle tests on two power devices, and when one of them is damaged, the other one cannot work either. Summary of the Utility Model

[0005] The purpose of the present utility model is to overcome the problems in the above-mentioned existing technologies, such as too few test channels, inability to test multiple power devices simultaneously, and inability to freely combine the test device, and provide a power cycle test device for discrete power devices. The present utility model proposes a power cycle test equipment for discrete power devices, which allows users to freely combine the clamping structures, flexibly adjust the test combinations according to the test requirements, can test multiple groups of power devices simultaneously, and significantly improves the parallelism and efficiency of the test. Each test unit is independent, facilitating maintenance and replacement, and reducing the maintenance cost and time in case of faults. Moreover, the heat dissipation design is improved, enhancing the stability of the fixture at high temperatures and the test life of the device.

[0006] The purpose of the present utility model can be achieved through the following technical solutions:

[0007] A discrete power device power cycle test device includes one row or multiple rows of test components, and the multiple rows of test components are connected in parallel with each other;

[0008] The test component has one or more test stations, and the multiple test stations are connected in series with each other. The test component is configured to test the durability of the power device installed on the test station.

[0009] Further, the test component has a first end and a second end arranged opposite to each other;

[0010] The test component includes a plurality of clamping members between the first end and the second end. The test station is installed on the clamping member, and two adjacent clamping members are connected in series with each other.

[0011] Even further, on one side of the outermost clamping member of each row of test components close to the first end or the second end, a signal terminal for applying current to the power device is provided;

[0012] On one side of the outermost clamping member of each row of test components away from the first end or the second end, a series terminal for connecting a plurality of clamping members is provided.

[0013] Even further, when the number of clamping members is greater than or equal to three, series terminals are connected to both ends of the clamping members of each row of test components except the outermost clamping member.

[0014] Even further, the test component further includes insulating blocks arranged on both sides of the clamping member. The signal terminal and the series terminal are installed on the insulating block, and the signal terminal is connected to the power device.

[0015] Even further, the test component further includes a gate terminal connected to the power device and used for disconnecting the current applied to the power device, and a temperature sensor terminal connected to the power device.

[0016] Even further, the clamping member includes:

[0017] A base formed with a test station;

[0018] A pressing block abutting against the power device installed on the test station;

[0019] And a spring screw installed on the pressing block and used for controlling the pressing block to apply pressure to the power device;

[0020] Wherein, one end of the pressing block has a protrusion matching the test station.

[0021] Even further, the cycle test device further includes a base, and the test component is installed on the base.

[0022] Furthermore, several cooling water channels are provided inside the base, and the cooling water channels at least pass through the base. Several water inlet pipes and outlet pipes communicated with the cooling water channels are respectively arranged on both sides of the base.

[0023] Furthermore, fins are arranged at the place where the cooling water channels pass through the base.

[0024] Compared with the prior art, the utility model has the following beneficial effects:

[0025] 1. Through the design of series connection terminals, the utility model allows users to independently configure the clamping members according to specific test requirements and flexibly adjust the test component combinations. This design supports the parallel testing of multiple groups of power devices, thus significantly improving the efficiency and parallel performance of the test process. The independence of each test component ensures the maintainability of the system, so that when a failure occurs, the maintenance cost and time are significantly reduced. In addition, the optimized heat dissipation design ensures the performance stability and reliability of the power devices in a high-temperature working environment, and is also convenient for effective performance evaluation in laboratory or industrial applications.

[0026] 2. The utility model has high efficiency and supports the parallel testing of multiple groups of power devices, thus significantly improving the efficiency and parallel performance of the test process.

[0027] 3. The utility model can perform precise pressure adjustment. The power device module is pressed tightly by a spring screw to ensure good contact between the power device and the heat dissipation interface.

[0028] 4. The utility model can dissipate heat efficiently through fins. The base of the power device adopts an optimized heat dissipation design to effectively manage high temperature.

[0029] 5. The utility model can perform real-time monitoring. The signal terminal and the temperature sensor terminal provide current and measure voltage and temperature to monitor the performance of the power device.

[0030] 6. The utility model has the advantage of modular maintainability. Each test unit component is convenient for maintenance and replacement, reducing the maintenance cost and time in case of failure. Description of the Drawings

[0031] Figure 1 It is a schematic structural diagram of the test device in Embodiment 1.

[0032] Figure 2 It is a schematic structural diagram of the clamping member of the test device in Embodiment 1.

[0033] Figure 3 It is a test diagram of the base of the test device in Embodiment 1.

[0034] Reference numerals in the drawings:

[0035] 100 - Test Component

[0036] 110 - Test Station, 120 - First End, 130 - Second End, 140 - Clamping Piece, 1401 - Base, 1402 - Pressing Block, 1403 - Spring Screw, 1404 - Protrusion, 150 - Signal Terminal, 160 - Series Terminal, 170 - Gate - level Terminal, 180 - Temperature Sensor Terminal, 190 - Insulating Block;

[0037] 200 - Base;

[0038] 210 - Cooling Water Channel, 220 - Inlet Pipe, 230 - Outlet Pipe, 240 - Fins. Detailed Embodiment

[0039] The present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present utility model, and gives the detailed implementation manner and specific operation process, but the protection scope of the present utility model is not limited to the following embodiments.

[0040] In the technical solution of the present utility model, features such as component models, material names, connection structures, control methods, etc. that are not clearly described are regarded as common technical features disclosed in the prior art.

[0041] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0042] In the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined. In addition, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a bolt connection or a welding connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0043] Currently, single - channel power cycle test equipment in the industry usually has only one test channel and is suitable for the test of a single device. They are usually smaller, easier to operate and maintain, but the test volume is limited. And when conducting durability tests on some power devices simultaneously, the accuracy and parallelism are significantly higher.

[0044] Based on this, an embodiment of the present application provides a power cycle test device for discrete power devices. Please refer to the structure shown in Figures 1 to 3 which includes one row or multiple rows of test components 100, and the multiple rows of test components 100 are connected in parallel with each other;

[0045] The test component 100 has one or more test stations 110, and the multiple test stations 110 are connected in series with each other. The test component 100 is configured to test the durability of the power device installed on the test station 110.

[0046] Specifically, the power device is installed on the test station 110, and the test component 100 supplies power to the power device installed on the test station 110, so that the power device rises to the highest operating temperature, then the power supply is disconnected, and after cooling to the lowest operating temperature, the cycle is repeated to perform a cyclic durability test. Therefore, when multiple power devices are installed on multiple test stations 110, the test effect has synchronism, that is, multiple power devices can be tested simultaneously, and the test results are also more accurate and efficient.

[0047] In order to improve the accuracy of the test results, in some embodiments, please refer to Figure 1 and Figure 2 shown, the test component 100 has a first end 120 and a second end 130 arranged oppositely;

[0048] The test component 100 includes a plurality of clamping members 140 between the first end 120 and the second end 130. The test station 110 is installed on the clamping members 140, and two adjacent clamping members 140 are connected in series with each other.

[0049] It should be noted that when testing the same power device, if a traditional test instrument is used, the power-on cannot be unified, and the temperature rise of the power device cannot be unified, so the test results are not accurate enough. When testing different power devices, single-factor control should be used to compare the durability of two different power devices. This is mainly because when the clamping members 140 are connected in series, multiple power devices are connected in series at the same time, and the test factors are controllable.

[0050] To further illustrate how to perform the test and how the multiple clamping members 140 are connected in series with each other, in some embodiments, please refer to Figure 1 and Figure 2 shown, on one side of the outermost clamping member 140 of each row of test components 100 close to the first end 120 or the second end 130, a signal terminal 150 for applying current to the power device is provided;

[0051] On the side of the outermost clamping member 140 of each row of test components 100 away from the first end 120 or the second end 130, a series terminal 160 for connecting a plurality of clamping members 140 is provided.

[0052] As some optional examples, when the number of the clamping members 140 is greater than or equal to three, series terminals 160 are connected to both ends of the clamping members 140 of each row of the test components 100 except for the outermost clamping members 140.

[0053] In the above technical solution, on the one hand, the signal terminal 150 serves as a medium for the external device to supply power to the power device, and on the other hand, it plays a role in transmitting voltage data, etc. The series terminal 160 connects two clamping members 140 to each other, facilitating the consistency of the power-on test.

[0054] Some optional implementation manners are further exemplified as follows:

[0055] When there are two clamping members 140, they are connected in series in sequence from one side to the other side as follows: signal terminal 150 - clamping member 140 - series terminal 160 - clamping member 140 - signal terminal 150.

[0056] When there are three clamping members 140, they are connected in series in sequence from one side to the other side as follows: signal terminal 150 - clamping member 140 - series terminal 160 - clamping member 140 - series terminal 160 - clamping member 140 - signal terminal 150.

[0057] When there are four clamping members 140, they are connected in series in sequence from one side to the other side as follows: signal terminal 150 - clamping member 140 - series terminal 160 - clamping member 140 - series terminal 160 - clamping member 140 - series terminal 160 - clamping member 140 - signal terminal 150.

[0058] To further illustrate how the signal terminal 150 and the series terminal 160 are installed, in some implementation manners, please refer to Figure 1 and Figure 2 As shown, the test component 100 further includes insulating blocks 190 arranged on both sides of the clamping member 140. The signal terminal 150 and the series terminal 160 are installed on the insulating blocks 190, and the signal terminal 150 is connected to the power device.

[0059] Specifically, each part is assembled through the insulating block 190, and the installation is effective and will not damage the power device.

[0060] In addition, regarding how to detect that the power device reaches the test temperature and how to cut off the power after reaching the temperature, in some implementation manners, please refer to Figure 2 As shown, the test component 100 further includes a gate terminal 170 connected to the power device and used to cut off the current applied to the power device, and a temperature sensor terminal 180 connected to the power device.

[0061] It should be noted that the temperature sensor terminal 180 and the gate terminal 170 are both installed on the insulating block 190. When the temperature sensor connected to the temperature sensor terminal 180 detects that the power device reaches the maximum operating temperature, the gate terminal 170 operates to disconnect the current.

[0062] Next, the clamping member 140 will be described. In some embodiments, please refer to Figure 2 as shown, the clamping member 140 includes:

[0063] A base 1401 formed with a test station 110;

[0064] A pressing block 1402 that abuts against the power device installed on the test station;

[0065] And a spring screw 1403 installed on the pressing block 1402 to control the pressing block 1402 to apply pressure to the power device;

[0066] Wherein, one end of the pressing block 1402 has a protrusion 1404 that matches the test station 110.

[0067] Specifically, a groove is formed on the base 1401, and this groove is the test station 110. The power device is installed in this groove. The protrusion 1404 of the pressing block 1402 matches this groove and the pressure applied to the power device can be adjusted by the spring screw 1403.

[0068] For the convenience of installing the test component, in some embodiments, please refer to Figure 1 as shown, the cyclic test device further includes a base 200, and the test component 100 is installed on the base 200.

[0069] In addition, for the convenience of cooling the test component, in some embodiments, please refer to Figure 1 and Figure 3 as shown, several cooling water channels 210 are provided inside the base 200. The cooling water channels 210 at least pass through the base 1401. Several water inlet pipes 220 and water outlet pipes 230 communicated with the cooling water channels 210 are respectively provided on both sides of the base 200.

[0070] Of course, for enhancing the heat dissipation effect, in some alternative embodiments, please refer to Figure 3 as shown, fins 240 are arranged at the place where the cooling water channels 210 pass through the base 1401.

[0071] In the above technical solution, fins 240 are designed below the base 1401 to connect the base 1401 to the base 200. The base 200 is provided with a cooling water channel 210 for the circulation of the coolant, so as to conduct impact heat dissipation on the fins 240, ensure the temperature control of the power device, and improve the stability of the clamping member 140 at high temperatures and the test life of the device.

[0072] The above embodiments will be described in more detail below with specific examples.

[0073] Embodiment 1

[0074] As Figures 1 to 3 shown, this embodiment provides a discrete power device power cycle test device, which includes two rows of test components 100, and the two rows of test components 100 are connected in parallel with each other;

[0075] The test component 100 has three test stations 110, and the three test stations 110 are connected in series with each other. The test component 100 is configured to test the durability of the power device installed on the test station 110.

[0076] In this embodiment, the test component 100 has a first end 120 and a second end 130 arranged opposite to each other. Three clamping members 140 are located between the first end 120 and the second end 130. Adjacent two clamping members 140 are connected in series with each other. On the side of the outermost clamping member 140 of each row of test components 100 close to the first end 120 or the second end 130, a signal terminal 150 for applying current to the power device is provided; on the side of the outermost clamping member 140 of each row of test components 100 away from the first end 120 or the second end 130, a series terminal 160 for connecting a plurality of clamping members 140 is provided. More specifically, in series from one side to the other side are: signal terminal 150 - clamping member 140 - series terminal 160 - clamping member 140 - series terminal 160 - clamping member 140 - signal terminal 150. The test component 100 further includes an insulating block 190, a gate terminal 170, and a temperature sensor terminal 180. The insulating block 190 is arranged on both sides of the clamping member 140 (specifically, the insulating block 190 is provided on the upper surface of the base 200). The signal terminal 150 is connected to the power device, the gate terminal 170 is connected to the power device and is used to disconnect the current applied to the power device, the temperature sensor terminal 180 is connected to the power device, and the signal terminal 150, the temperature sensor terminal 180, the series terminal 160, and the gate terminal 170 are installed on the insulating block 190.

[0077] In this embodiment, the clamping member 140 includes a base 1401, a pressing block 1402, and a spring screw 1403. A test station 110 is formed on the base 1401. The pressing block 1402 abuts against the power device installed on the test station. The spring screw 1403 is installed on the pressing block 1402 to control the pressing block 1402 to apply pressure to the power device. One end of the pressing block 1402 has a protrusion 1404 matching the test station 110. The cyclic test device further includes a base 200, and the test assembly 100 is installed on the base 200. A plurality of cooling water channels 210 are provided inside the base 200. The cooling water channels 210 pass through at least the base 1401. A plurality of water inlet pipes 220 and outlet pipes 230 communicating with the cooling water channels 210 are respectively provided on both sides of the base 200. Fins 240 are arranged at the place where the cooling water channels 210 pass through the base 1401.

[0078] The working principle of this embodiment is as follows:

[0079] The power device is placed on the test station 110. The spring screw 1403 is installed on the pressing block 1402 to control the pressing block 1402 to apply pressure to the power device. By tightening the screw, the pressure on the power device can be precisely controlled. The external device supplies power to the power device through the signal terminal 150, controls the turn-off through the gate terminal 170, heats the power device to its maximum operating temperature by applying a large current, and then cuts off the current through the gate terminal 170 to cool it to the minimum operating temperature. Through such a cyclic process, the thermal stress effect generated by the current during the actual operation of the device is simulated, and the junction temperature fluctuation of the device during actual operation is simulated. At the same time, voltage data is collected through the signal terminal 150, and temperature data is collected through the temperature sensor terminal 180, so as to monitor the electrical characteristics and temperature characteristics of the power device in real time. According to the working conditions, series terminals can be used to connect between the clamping structures to test multiple groups of power devices under the same working conditions; it also allows users to freely combine the clamping structures and flexibly adjust the test combination according to the test requirements.

[0080] The power device generates a relatively high temperature during operation. Fins 240 are designed under the base 1401 to connect the base 1401 to the base 200. A cooling water channel 210 is provided inside the base 200 for the circulation of the coolant, so as to conduct impact heat dissipation on the fins 240, ensure the temperature control of the power device module, and improve the stability of the clamping member 140 at high temperatures and the test life of the device.

[0081] This design allows users to independently configure the clamping member 140 according to specific test requirements and flexibly adjust the combination of the test components 100. This design supports the parallel testing of multiple groups of power devices, thus significantly improving the efficiency and parallel performance of the test process. The independence of each test component 100 ensures the maintainability of the system, enabling significant reduction in maintenance costs and time in case of failures. In addition, the optimized heat dissipation design ensures the performance stability and reliability of the power devices in high-temperature working environments and also facilitates effective performance evaluation of them in laboratory or industrial applications.

[0082] The above description of the embodiments is to enable those of ordinary skill in the art to understand and use the utility model. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the utility model is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the utility model according to the disclosure of the utility model should be within the protection scope of the utility model.

Claims

1. A discrete power device power cycle test device, characterized in that: It comprises one or more rows of test components (100), and the multiple rows of test components (100) are connected in parallel with each other; The test assembly (100) has one or more test stations (110), and the multiple test stations (110) are connected in series. The test assembly (100) is configured to test the durability of a power device installed on the test station (110).

2. A discrete power device power cycle test device according to claim 1, characterized in that: The test assembly (100) has a first end (120) and a second end (130) arranged opposite to each other; The test assembly (100) comprises a plurality of clamping members (140) between a first end (120) and a second end (130), the test station (110) is mounted on the clamping members (140), and two adjacent clamping members (140) are connected in series.

3. A discrete power device power cycle test device according to claim 2, characterized in that: The outermost clamping piece (140) of each row of test components (100) is provided with a signal terminal (150) for applying current to the power device on a side close to the first end (120) or the second end (130); The outermost clamping piece (140) of each row of test components (100) is provided with a series terminal (160) for connecting a plurality of clamping pieces (140) on a side of the clamping piece (140) away from the first end (120) or the second end (130).

4. A discrete power device power cycle test device according to claim 3, characterized in that: When the number of the clamping members (140) is greater than or equal to three, two ends of the clamping members (140) except the outermost clamping members (140) in each row of test components (100) are connected to series terminals (160).

5. A discrete power device power cycle test device according to claim 3 or 4, characterized in that: The test assembly (100) further comprises insulating blocks (190) arranged on both sides of the clamp (140), the signal terminal (150) and the series terminal (160) being mounted on the insulating blocks (190), and the signal terminal (150) being connected to the power device.

6. A discrete power device power cycle test device according to claim 3 or 4, characterized in that: The test assembly (100) also includes a gate terminal (170) connected to the power device and used to disconnect the current applied to the power device, and a temperature sensor terminal (180) connected to the power device.

7. A discrete power device power cycle test device according to claim 2, characterized in that: The clamping member (140) comprises: A base (1401) is formed with a testing station (110); A pressing block (1402) abutting against a power device mounted on the test station; and a spring screw (1403) mounted on the pressing block (1402) to control the pressing block (1402) to apply pressure to the power device; Wherein, one end of the pressing block (1402) has a protrusion (1404) matching the testing station (110).

8. A discrete power device power cycle test device according to claim 7, characterized in that: The cycle test device further comprises a base (200), and the test assembly (100) is mounted on the base (200).

9. A discrete power device power cycle test device according to claim 8, characterized in that: A plurality of cooling water channels (210) are provided inside the base (200), and the cooling water channels (210) at least pass through the base (1401). A plurality of water inlet pipes (220) and water outlet pipes (230) connected to the cooling water channels (210) are respectively provided on both sides of the base (200).

10. A discrete power device power cycle test device according to claim 9, characterized in that: The base (1401) is provided with fins (240) at the location where the cooling water channel (210) passes.

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