Universal pressing tool for power module

Abstract

The utility model discloses a universal pressing tool for a power module, which comprises a base for bearing the power module, a magnetic plate for pressing the power module and a magnetic hollow supporting column for pressing and supporting, and the supporting column corresponds to a pin of the power module in a working state. The utility model relates to the technical field of power device product installation, a plurality of supporting columns are processed and adsorbed on a magnetic plate, the purpose of simultaneously pressing all pins of a power module and a circuit board is achieved, each pin corresponds to one supporting column, and several pins close to each other can be designed into a whole, such as pins of a current sensor. The diameter of the inner cavity of the supporting column is larger than that of the pin to ensure that the pin passes through smoothly, and the peripheral diameter of the column needs to ensure that surrounding electronic elements are not pressed. The tool is simple in structure, low in manufacturing difficulty and beneficial to mass production in factories.

Description

Technical Field

[0001] The utility model belongs to the technical field of power device product installation, and particularly belongs to a universal pressing tooling for power modules. Background Technique

[0002] With the rapid growth of the new energy vehicle industry, vehicle manufacturers have increasingly higher requirements for the integration and reliability of vehicle components. As the core component for electric energy conversion in new energy vehicles, the motor controller has become the focus of research for many enterprises. Among them, power devices are directly involved in the conversion of alternating and direct currents, and their reliability directly affects the life of the controller and even the driving safety of the vehicle.

[0003] Nowadays, the trend of modularization and integration of power semiconductor devices is becoming more and more obvious. Some manufacturers have developed power modules with small volume, high efficiency, and high reliability, directly installing the circuit board for driving power devices and dedicated current sensors on the module to form an integrated unit. For example, an IGBT module (a type of power module) of a certain manufacturer, through the lead-out press-fit pins with slightly larger ends, together with the pins of the dedicated current sensor, is directly inserted into the corresponding press-fit holes on the drive circuit board, and then the drive circuit board is fixed on the IGBT module and the current sensor with fasteners, which is convenient for installation and has reliable connection. When pressing the IGBT module, the current sensor, and the drive circuit board together, if manual pressing is used, due to the large number of pins, it is difficult to press all the pins in place at one time, and it is easy to damage the surface of the drive circuit board and electronic components due to operation errors. Therefore, a specially designed tooling is required for pressing.

[0004] However, almost all of the existing power module pressing toolings are designed for a specific type of power module and do not have universality. Content of the Utility Model

[0005] The purpose of the utility model is to provide a universal pressing tooling for power modules, which solves the problem that almost all of the existing power module pressing toolings are designed for a specific type of power module and do not have universality.

[0006] The technical solution adopted by the utility model is as follows: A universal pressing tooling for power modules includes a base for carrying the power module, a magnetic plate for pressing the power module, and is also equipped with a magnetic hollow support column for pressing support. In the working state, the support column corresponds to the pins of the power module.

[0007] Further, a circuit board is provided above the power module, the press-fit holes of the circuit board are aligned with the pins of the power module, and the pins of the power module are preliminarily inserted into the press-fit holes of the circuit board.

[0008] Further, the inner cavity diameter of the support column is larger than the pin diameter of the power module, and the outer diameter is larger than the press-fit hole diameter of the circuit board.

[0009] Further, positioning holes are also provided on the base. The current sensor is inserted into the positioning holes through positioning pins. The pins of the current sensor are aligned with the press-fit holes of the circuit board, and support columns are correspondingly arranged on the pins of the current sensor.

[0010] Further, a cavity for avoiding the bottom heat dissipation columns of the power module is provided on the base.

[0011] Further, both the magnetic plate and the support column are made of soft magnetic materials.

[0012] Further, the magnetic plate is magnetically connected to the support column by an electromagnetic method.

[0013] Further, several turns of coils are wound in the groove of the magnetic plate. The ends of the coils are connected in series with a current-limiting resistor and led out through a low-voltage DC connector.

[0014] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present utility model are as follows:

[0015] 1. The universal press-fit tooling for the power module realizes the purpose of simultaneously press-fitting all the pins of the power module and the circuit board by machining several magnetic hollow support columns and adsorbing them on the magnetic plate. Each pin corresponds to a support column, and several pins that are relatively close can be designed as a whole, such as the pins of the current sensor. The inner cavity diameter of the support column is larger than the pin diameter to ensure the smooth passage of the pins, and the outer diameter of the cylinder needs to ensure that it will not press on the surrounding electronic components. This tooling has a simple structure and low manufacturing difficulty, which is beneficial to mass production in the factory.

[0016] 2. Through the serialization of the support columns and after manually arranging the support columns and adsorbing them on the magnetic plate, the rapid press-fitting of various types of power modules is realized. It has good versatility, reliable assembly, and avoids the uncertainty of manual assembly. It is more convenient for assembly line operation. For example, after arranging the support columns of a certain type and adsorbing them on the magnetic plate, continuous power supply can be maintained, that is, without power interruption, and directly press-fit the next group of power modules and circuit boards of this type, greatly improving the work efficiency and reducing the work pressure of the staff.

[0017] 3. The purpose of using an electromagnet instead of a permanent magnet between the magnetic plate and the support column is to avoid the cylinders being instantly sucked up and displaced due to the strong magnetic force when the magnet block approaches. The current sensor is placed on the tooling base and positioned through positioning pins and positioning holes to stably withstand the press-fitting force. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of the three-dimensional structure provided by the embodiment of the present utility model;

[0020] Figure 2 Schematic diagram of the disassembly of the assembly object provided by the embodiment of the present utility model;

[0021] Figure 3 Schematic diagram of the tooling assembly provided by the embodiment of the present utility model.

[0022] Description of the drawings: 1. Support column; 2. Magnetic plate; 3. Base; 4. Positioning pin; 5. Power module; 6. Current sensor; 7. Circuit board. Detailed implementation manners

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0025] In the description of the present utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product of this application is usually placed when in use. It 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 thus should not be construed as a limitation of the present utility model.

[0026] The following will be combined with Figures 1 - 3 to describe the present utility model in detail.

[0027] Embodiment

[0028] As Figure 1 shown, a general pressing tooling for a power module includes a base 3 for carrying the power module 5. The base 3 is made of engineering plastic to avoid scratching the bottom sealing surface of the power module 5. A cavity is also provided on the base 3 for avoiding the heat dissipation columns at the bottom of the power module 5 to prevent damage to the heat dissipation columns when pressing downwards. It also includes a magnetic plate 2 for pressing the power module 5, and a magnetic hollow support column 1 for pressing and supporting is fitted on the magnetic plate 2. In the working state, the support column 1 corresponds to the pins of the power module 5.

[0029] The support column 1 corresponds to the pins of the power module 5. The support column 1 is processed into a series of common sizes. When in use, a suitable size is selected. If not, it can be processed additionally to expand the size series. When this pressing tooling is not working or not in use, the support column 1 can be placed in a special storage box, and the storage box is not a part of this tooling, so no more details will be described here.

[0030] As Figure 2 shown, a circuit board 7 is provided above the power module 5. The circuit board 7 is a drive circuit board and is used to drive the power module 5. The specific model is not specifically limited here, as long as it meets the actual use requirements. The pressing holes of the circuit board 7 are aligned with the pins of the power module 5, and the pins of the power module 5 are preliminarily inserted into the pressing holes of the circuit board 7.

[0031] The inner cavity diameter of the support column 1 is larger than the diameter of the pins of the power module 5, and the outer diameter is larger than the aperture of the pressing holes of the circuit board 7. At the same time, the outer diameter of the support column 1 needs to ensure that it will not press on the surrounding electronic components, that is, to avoid damaging the electronic components on the circuit board 7.

[0032] As Figure 1 shown, positioning holes are provided on the base 3. The current sensor 6 is inserted into the positioning holes through the positioning pins 4. The specific model of the current sensor 6 is not specifically limited here, as long as it meets the actual use requirements. The pins of the current sensor 6 are aligned with the pressing holes of the circuit board 7, and support columns 1 are correspondingly arranged on the pins of the current sensor 6. The current sensor 6 is placed on the base 3 and is positioned through the positioning holes and the positioning pins 4. When starting the press to press downwards, it can stably bear the pressing force.

[0033] Both the magnetic plate 2 and the support column 1 are made of soft magnetic materials, such as silicon steel. So that the magnetic plate 2 and the support column 1 have almost no magnetism by themselves when there is no external magnetic field.

[0034] The magnetic plate 2 is magnetically connected to the support column 1 by an electromagnetic method. The purpose of using an electromagnet instead of a permanent magnet is to avoid the support columns 1 being instantly attracted and displaced due to the strong magnetic force when the magnetic plate 2 approaches.

[0035] As Figure 3 shown, a coil is wound in the middle groove of the magnetic plate 2. The number of turns needs to be large enough to ensure that a sufficiently large magnetic induction intensity can be generated with a small current. If increasing the number of turns cannot significantly increase the resistance, a current-limiting resistor can be connected in series at the end of the coil, and the end is led out through a low-voltage DC connector. When in use, a low-voltage direct current needs to be applied, generally 5V, 12V, etc.

[0036] Specifically, when using the general pressing tooling for the power module, first place the base 3 stably at the center of the press workbench, and place the power module 5 and the current sensor 6 on the base 3; align the pressing holes on the circuit board 7 with the pins of the power module 5 and the current sensor 6, and insert all the pins into the pressing holes preliminarily.

[0037] Vertically place the support posts 1 stably at each pin. To enhance stability, additional support posts 1 can be added at appropriate blank positions on the circuit board 7. After the support posts 1 are placed, carefully place the magnetic plate 2 flat on the support posts 1. At this time, turn on the power of the magnetic plate 2, and then start the press to press the magnetic plate 2 downward until the bottom surface of the circuit board 7 contacts the top bolt hole end face of the power module 5 and reaches the predetermined pressure.

[0038] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A general pressing tooling for power modules, characterized in that: It includes a base (3) for carrying a power module (5), a magnetic plate member (2) for pressing the power module (5), and a magnetic hollow support column (1) for pressing and supporting. In the working state, the support column (1) corresponds to the pins of the power module (5).

2. The universal pressing tooling for the power module according to claim 1, wherein: Above the power module (5), there is a circuit board (7). The pressing holes of the circuit board (7) are aligned with the pins of the power module (5), and the pins of the power module (5) are preliminarily inserted into the pressing holes of the circuit board (7).

3. The general pressing tooling for power modules according to claim 2, characterized in that: The inner cavity diameter of the support column (1) is larger than the diameter of the pins of the power module (5), and the outer diameter is larger than the aperture of the pressing holes of the circuit board (7).

4. The general pressing tooling for the power module according to claim 2, characterized in that: The base (3) is also provided with positioning holes. The current sensor (6) is inserted into the positioning holes through positioning pins (4). The pins of the current sensor (6) are aligned with the pressing holes of the circuit board (7), and support columns (1) are correspondingly arranged on the pins of the current sensor (6).

5. The general pressing tooling for a power module according to claim 1, wherein: The base (3) is provided with a cavity for avoiding the bottom heat dissipation columns of the power module (5).

6. The universal pressing tooling for power modules according to claim 1, characterized in that: Both the magnetic plate member (2) and the support column (1) are made of soft magnetic materials.

7. The general pressing tooling for power modules according to claim 1, characterized in that: The magnetic plate member (2) is magnetically connected to the support column (1) by an electromagnetic method.

8. The general pressing tooling for the power module according to claim 1, wherein: Several turns of coils are wound in the grooves of the magnetic plate member (2). The ends of the coils are connected in series with current-limiting resistors and led out through low-voltage DC connectors.

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