Plug-in clamp adaptive to dynamic test of three-level power module
By designing a plug-in fixture adapted to three-level power modules, the testing challenges of multi-pin structures were solved using PCB boards and specific connection structures, achieving efficient and accurate characteristic testing while reducing costs and time.
Patent Information
- Application Number
- CN202422603927.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-10-28
AI Technical Summary
The multiple operating circuits and multi-pin structure of the three-level power module make characteristic testing difficult, especially the inconvenience of installing the EasyPACK module and the impact of flying wire testing on the accuracy of the test results.
A plug-in fixture adapted to a three-level power module was designed. The fixture uses a PCB board as the main body and is equipped with pin pads, busbar terminals, drive line plug slots, nut seat pads, and crown spring female holes to achieve a stable connection with the power module and avoid flying wire testing.
It improves the accuracy of test results, simplifies circuit connections, reduces costs and shortens the manufacturing cycle, maintains the integrity of the module, and facilitates extreme testing.
Smart Images
Figure CN223551760U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power module testing technology, specifically to a plug-in clamp adapted for dynamic testing of three-level power modules. Background Technology
[0002] With the rapid development of the new energy industry, more and more power semiconductor chips are being used in three-level topologies. In a three-level NPC topology, each bridge arm consists of four IGBTs with anti-parallel diodes connected in series, along with two additional diodes, DH and DL, connecting their intermediate nodes to the neutral point of the DC bus. Based on the characteristics of the output voltage and current, the base frequency output in one cycle has four different freewheeling operating states, and most adopt the EasyPACK package. However, the multiple operating loops and multi-pin structure of the three-level power module present significant challenges for characteristic testing; for example, EasyPACK power modules are inconvenient to install, and the additional parasitic parameters introduced by flying wire testing can affect the test results.
[0003] Therefore, a connector that fits the pin positions is urgently needed to connect the three-level power module to the test circuit. Utility Model Content
[0004] The purpose of this invention is to address the challenges posed by the multiple working circuits and multi-pin structure of a three-level power module in performance testing. A custom-designed plug-in fixture adapted for dynamic testing of three-level power modules solves this problem, greatly benefiting the performance testing of power modules.
[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:
[0006] This utility model designs a plug-in clamp adapted for dynamic testing of three-level power modules, the plug-in clamp comprising:
[0007] The PCB board body serves as the main body of the insertion clamp;
[0008] Several pin pads are disposed on the PCB board body, and the pin pads are configured one by one to correspond to the pin positions on the power module to be tested.
[0009] Several busbar terminals are disposed on the PCB board body for connecting busbar capacitors;
[0010] Several drive line insertion slots are provided on the PCB board body for connecting the PCB board body and the gate circuit inside the power module.
[0011] Nut seat pads, which are disposed on the PCB board body, are used to connect the load inductor and the power module;
[0012] And several crown spring female holes, which are corresponding to the pin pads, for connecting the PCB board body to the pins in the power module.
[0013] This utility model is a specially designed plug-in clamp adapted to a three-level power module, which is of great benefit to the characteristic testing of the power module. It is made of PCB board (i.e. printed circuit board), which serves as a carrier for various electronic components and is usually used for electrical connections in circuits.
[0014] Furthermore, a plug-in fixture adapted for dynamic testing of three-level power modules: the PCB board body is configured as a double-sided board.
[0015] Furthermore, a plug-in fixture adapted for dynamic testing of three-level power modules: the drive line plug-in slot and the nut seat pad are disposed on the front side of the PCB board body.
[0016] Furthermore, a plug-in fixture adapted for dynamic testing of three-level power modules: the crown spring female hole is located on the back of the PCB board body.
[0017] Furthermore, a plug-in fixture adapted for dynamic testing of a three-level power module: the front side of the PCB board body is provided with 4 sets of gate drive pads, which include GE1, GE3, GE4 and GE4 respectively, and each set of gate drive pads is provided with the drive line plug-in slot.
[0018] Furthermore, a plug-in fixture adapted for dynamic testing of three-level power modules: the busbar terminals are disposed at the end of the PCB board body.
[0019] Furthermore, a plug-in fixture adapted for dynamic testing of a three-level power module is provided: the nut seat pad is provided with several press-fit welding terminals to realize the connection between the power module and the load.
[0020] Specifically, this invention manufactures a connector fixture adapted for testing the characteristics of a specified three-level power module. First, a PCB board drawing is created based on the pin positions and definitions of the power module. Then, the corresponding components are fabricated and soldered to complete the process. This connector fixture, designed for testing three-level power modules, includes a PCB board body, pin slots adapted to the pins in the power module, drive line connector slots, nut seats, and crown spring female holes. The PCB board body is the completed printed circuit board. This invention uses a double-sided board, which increases current carrying capacity. Busbar terminals are used to connect to the busbar capacitor bank; drive line connector slots are connected to the gates of chips to connect to the driver board; the nut seats connect the load inductor and the power terminal of the chip; the drive line connector slots and nut seats are mounted on the front side of the PCB board body, and the crown spring female holes are mounted on the back side, corresponding to each pin of the power module, for connecting the module.
[0021] The beneficial effects of this utility model are:
[0022] This invention relates to a plug-in fixture designed for dynamic testing of three-level power modules. It avoids the need for wire bonding in the power module, facilitating circuit connection. The power module retains its integrity after installation and removal, making it convenient for other tests. It also avoids the influence of parasitic parameters from flying wire testing on test results, improving accuracy. Furthermore, this plug-in fixture is low-cost, has a short manufacturing cycle, and can be used as a regular consumable during extreme testing. Attached Figure Description
[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a diagram showing the pin locations in the power module provided in Embodiment 1 of this utility model.
[0025] Figure 2 This is a 2D schematic diagram of a plug-in clamp adapted for dynamic testing of a three-level power module, provided in Embodiment 1 of this utility model.
[0026] The markings in the diagram are: 1-PCB board body, 2-pin pad, 3-busbar terminal, 4-drive line insertion slot, 5-press-fit welding terminal. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0028] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "top," and "bottom," etc., indicating orientation or positional relationships, are only for the convenience of describing this utility model and simplifying the description, and 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 of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this utility model described herein can be implemented in orders other than those illustrated or described herein.
[0029] Example 1
[0030] like Figures 1-2 As shown, this embodiment 1 designs a plug-in clamp adapted for dynamic testing of three-level power modules. The plug-in clamp includes:
[0031] The PCB board body 1 is configured as a double-sided board and serves as the main body of the plug-in clamp;
[0032] Several pin pads 2 are disposed on the PCB board body 1, and each of the pin pads 2 is configured to correspond to a pin position on the power module to be tested. The pin configuration of the power module is as follows: Figure 1 As shown;
[0033] Three busbar terminals 3 are located at the ends of the PCB board body 1 for connecting busbar capacitors;
[0034] Several drive line insertion slots 4 are provided on the front side of the PCB board body 1 for connecting the PCB board body 1 and the gate circuit inside the power module; specifically, the front side of the PCB board body 1 is provided with 4 sets of gate drive pads, which include GE1, GE3, GE3 and GE4 respectively, and each set of gate drive pads is provided with 2 drive line insertion slots 4.
[0035] The nut seat pad is located on the front side of the PCB board body 1 and is used to connect the load inductor and the power module. Specifically, the nut seat pad is provided with 4 press-fit welding terminals 5 to realize the connection between the power module and the load.
[0036] And several crown spring female holes, which correspond to those disposed in the pin pads 2 and located on the back side of the PCB board body 1 (crown spring female holes are in Figure 2 (Not shown in the image), the crown spring female hole is used to connect the PCB board body 1 to the pins in the power module.
[0037] Specifically, such as Figure 2 The diagram shown is a plan view of a plug-in fixture adapted for dynamic testing of a three-level power module designed in Embodiment 1. The positions of the pin pads 2 correspond to... Figure 1 The diagram shows the pin locations of a three-level power module, with a total of 57 pin pads 2. The connection between the PCB board body 1 and the three-level power module can be achieved by soldering crown spring female holes into the pin pads 2. Different crown spring female holes can be selected based on the shape of the pins (leads) on the power module to achieve a compatible connection. In this typical example of embodiment 1, a 1.2*10.5mm crown spring female hole can be selected.
[0038] In this embodiment 1, the PCB board body 1 also includes four sets of gate drive pads, namely GE1, GE3, GE4, and GE5; and one set of load connection pads (nut seat pads). The gate drive pads can be soldered with drive line insertion slots 4, used to connect the drive board and the gate circuits inside the power module. When testing each different circuit, simply connect the drive board to the corresponding gate circuit to achieve signal transmission from the drive board to the module. The nut seat pad (AC1) can be equipped with four crimping welding terminals 5, with different specifications selected according to the screw size to achieve connection between the power module and the load. The three busbar terminals 3 correspond to the three voltage levels of the power module. In this embodiment 1, the pads are designed as slots to achieve connection between the power module and the bus capacitor, with high adaptability, capable of connecting busbars of different widths. To test different power modules, only different PCB boards need to be drawn according to the pin positions and topologies of different modules, featuring a short manufacturing cycle and low cost.
[0039] The above-described preferred embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of this utility model. Any obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.
Claims
1. A plug-in clamp adapted for dynamic testing of three-level power modules, characterized in that, The plug-in clamp includes: PCB board body (1), which serves as the main body of the insertion clamp; A number of pin pads (2) are provided on the PCB board body (1), and the number of pin pads (2) are set one by one to correspond to the pin positions on the power module to be tested; Several busbar terminals (3) are disposed on the PCB board body (1) for connecting busbar capacitors; Several drive line insertion slots (4) are provided on the PCB board body (1) for connecting the PCB board body (1) and the gate circuit inside the power module. Nut seat pads are provided on the PCB board body (1) and are used to connect the load inductor and the power module; And several crown spring female holes, which correspond to the pin pads (2) and are used to connect the PCB board body (1) to the pins in the power module.
2. The plug-in clamp adapted for dynamic testing of a three-level power module according to claim 1, characterized in that, The PCB board body (1) is configured as a double-sided board.
3. A plug-in clamp adapted for dynamic testing of a three-level power module according to claim 2, characterized in that, The drive line connector slot (4) and the nut seat pad are located on the front side of the PCB board body (1).
4. A plug-in clamp adapted for dynamic testing of a three-level power module according to claim 3, characterized in that, The crown spring female hole is located on the back of the PCB board body (1).
5. A plug-in clamp adapted for dynamic testing of a three-level power module according to claim 2, characterized in that, The front side of the PCB board body (1) is provided with 4 sets of gate drive pads, which include GE1, GE3, GE3 and GE4 respectively, and each set of gate drive pads is provided with the drive line insertion slot (4).
6. A plug-in clamp adapted for dynamic testing of a three-level power module according to claim 1, characterized in that, The busbar terminal (3) is located at the end of the PCB board body (1).
7. A plug-in clamp adapted for dynamic testing of a three-level power module according to claim 1, characterized in that, The nut seat pad is provided with several press-fit welding terminals (5) to realize the connection between the power module and the load.