A crimping type power module signal pin connector

Abstract

The utility model provides a kind of crimping type power module signal needle connector, including insulating shell and elastic contact component, insulating shell has cavity structure, and elastic contact component includes body structure, radial elastic member and axial elastic member;The opening of cavity structure is in the top of insulating shell, and body structure is housed in the cavity structure of insulating shell;Radial elastic member connects body structure and is located in the inner cavity of body structure, and radial elastic member is used to and the signal needle plug-in type connection of power module;After axial elastic member extends to the bottom of insulating shell along the side of insulating shell, it is bent to form pad contact plane, and pad contact plane is used to and the pad on circuit board is fixedly connected.Simplify assembly procedure, improve assembly speed, reduce signal needle damage risk, convenient to solve welding, improve service life, and keep performance stability.

Description

Technical Field

[0001] This utility model relates to the field of power semiconductor device technology, and in particular to a crimp-type power module signal pin connector. Background Technology

[0002] As a key component in power electronic systems, the gate signal transmission method of Insulated Gate Bipolar Transistors (IGBTs) is crucial to the system's performance and reliability. Currently, most IGBT modules use PCB via soldering to transmit gate signals. While this method meets basic requirements to some extent, with the continuous improvement of application environments and technical demands, this traditional connection method has gradually revealed a series of shortcomings.

[0003] Firstly, in actual operation, improper soldering can easily lead to electrostatic discharge (ESD) breakdown of the IGBT module gate. Because the gate is highly sensitive to static electricity, any improper operation can trigger ESD, resulting in gate damage. This not only increases the risk during production but also threatens the quality of the final product.

[0004] Secondly, when equipment malfunctions and requires repair, the existing solder joints must be desoldered. However, this process often damages the plating on the PCB, especially after multiple repairs, which can significantly reduce the overall performance and lifespan of the PCB. Furthermore, the desoldering and resoldering process is complex and time-consuming, hindering the rapid restoration of equipment functionality.

[0005] Furthermore, in high-frequency applications, the impedance stability of solder joints becomes a significant issue. Minor physical deformations or material aging at the solder joints can cause variations in impedance, affecting signal transmission quality and efficiency. This instability can lead to severe signal distortion or loss, especially under high-frequency operating conditions.

[0006] Finally, the introduction of traditional welding methods into automated assembly processes has made the entire process exceptionally complex. To ensure the quality of each weld point, additional inspection steps and stringent process control measures are typically required, which undoubtedly increases manufacturing costs and reduces production efficiency.

[0007] Based on the above analysis, it can be seen that the existing gate signal transmission scheme of IGBT modules has many limitations, and there is an urgent need for a new solution that is more reliable, efficient and easy to maintain to overcome these problems. Utility Model Content

[0008] Based on the above problems, this utility model provides a crimp-type power module signal pin connector, which aims to solve the technical problems such as the complex PCB through-hole soldering assembly of IGBTs in the prior art.

[0009] A crimp-type power module signal pin connector includes an insulating shell and an elastic contact assembly. The insulating shell has a cavity structure, and the elastic contact assembly includes a body structure, a radial elastic element, and an axial elastic element.

[0010] The opening of the cavity structure is at the top of the insulating shell, and the main body structure is housed within the cavity structure of the insulating shell;

[0011] The radial elastic element connects to the main body structure and is located in the inner cavity of the main body structure. The radial elastic element is used for plug-in connection with the signal pin of the power module.

[0012] The axial elastic element extends along the side of the insulating housing towards the bottom of the insulating housing and then bends to form a pad contact plane, which is used to fix and connect with the pads on the circuit board.

[0013] Furthermore, the radial elastic element includes a first spring and a second spring;

[0014] The first end of the first reed is connected to the first edge of the top opening of the body structure, and the first reed extends into the inner cavity of the body structure.

[0015] The first end of the second reed is connected to the second edge of the top opening of the main body structure, and the second reed extends into the inner cavity of the main body structure, with the first edge and the second edge being arranged opposite to each other.

[0016] Furthermore, the axial elastic element includes a third spring and a fourth spring;

[0017] The first end of the third reed is connected to the third edge of the top opening of the main body structure.

[0018] The first end of the fourth reed is connected to the fourth edge of the top opening of the main body structure, and the third and fourth edges are set opposite to each other;

[0019] After the third spring bends for the first time, it extends along the third side of the insulating shell towards the bottom of the insulating shell. The third spring bends for the second time near the bottom of the insulating shell to form a solder pad contact plane.

[0020] After the fourth reed bends for the first time, it extends along the fourth side of the insulating shell towards the bottom of the insulating shell. The fourth reed bends for the second time near the bottom of the insulating shell to form a solder pad contact plane.

[0021] The third and fourth sides are arranged opposite each other on the insulating housing.

[0022] Furthermore, the side of the insulating shell is provided with a limiting structure to limit the axial elastic element, and the limiting structure forms a limiting channel;

[0023] The axial elastic element does not contact the side of the insulating housing in the free state and extends from the top to the bottom of the insulating housing within the limiting channel.

[0024] Furthermore, the limiting channel is formed by the space between the first L-shaped sidewall and the second L-shaped sidewall;

[0025] The first L-shaped sidewall includes: a first sidewall perpendicular to the side portion of the insulating shell, and a second sidewall parallel to the side portion of the insulating shell;

[0026] The second L-shaped sidewall includes: a third sidewall perpendicular to the side of the insulating shell, and a fourth sidewall parallel to the side of the insulating shell;

[0027] The opening distance between the second and fourth sidewalls is smaller than the distance between the first and third sidewalls;

[0028] The width of the axial elastic element is smaller than the distance between the first sidewall and the third sidewall.

[0029] Furthermore, the insulating housing has two cavity structures, each cavity structure corresponding to an elastic contact assembly.

[0030] Furthermore, the main body structure has openings on the first side where the first edge is located and on the second side where the second edge is located.

[0031] Furthermore, the main body structure has a plurality of openings arranged along the top to the bottom of the main body structure on the first side where the first edge is located;

[0032] The main body structure has multiple openings arranged from the top to the bottom of the main body structure on the second side where the second edge is located.

[0033] Furthermore, the flexible contact components are made of conductive metal.

[0034] Furthermore, the insulating shell is injection molded using polyphenylene sulfide or liquid crystal polymer.

[0035] The beneficial technical effects of this utility model are as follows: This utility model proposes an improved power module assembly method, which uses surface mount technology to install connectors and utilizes an elastic compression structure to achieve mechanical-electrical connection between signal pins and the circuit board. This not only simplifies the assembly steps and improves the assembly speed, but also effectively solves the various drawbacks of traditional through-hole soldering methods, reduces the risk of signal pin damage, facilitates desoldering, improves service life, and maintains performance stability. It has important engineering application value and development prospects. Attached Figure Description

[0036] Figure 1This is a three-dimensional structural diagram of a crimp-type power module signal pin connector according to the present invention;

[0037] Figure 2 This is a side view of the signal pin connector for a crimped power module according to the present invention.

[0038] Figure 3 This is a front structural diagram of a crimp-type power module signal pin connector according to the present invention.

[0039] Figure 4 This is a top view of the signal pin connector for a crimped power module according to the present invention.

[0040] Figure 5 This is a schematic diagram of the AA cross-sectional structure of a crimp-type power module signal pin connector according to the present invention;

[0041] Figure 6 This is a schematic diagram of a crimp-type power module signal pin connector and a signal pin crimping state structure according to the present invention;

[0042] Figure 7 This is a schematic diagram of the insulating shell structure of a crimp-type power module signal pin connector according to the present invention;

[0043] Figure 8 This is a front view of the insulating shell of a crimp-type power module signal pin connector according to the present invention;

[0044] Figure 9 This is a three-dimensional structural diagram of the elastic contact component of a crimp-type power module signal pin connector according to the present invention.

[0045] Figure 10 This is a side view of the elastic contact assembly of a crimp-type power module signal pin connector according to the present invention.

[0046] Figure 11 This is a front structural diagram of the elastic contact assembly of a crimp-type power module signal pin connector according to the present invention.

[0047] in:

[0048] 1-Insulating housing; 1a-Top of insulating housing; 1b-Bottom of insulating housing; 1c-Third side of insulating housing; 1d-Fourth side of insulating housing; 1e-First side of insulating housing; 1f-Second side of insulating housing; 11-Cavity structure; 12-L-type limiting stage; 13-T-type limiting stage;

[0049] 2-Elastic contact assembly; 20-Body structure; 21-First spring; 22-Second spring; 23-Third spring; 24-Fourth spring; 25-Opening. Detailed Implementation

[0050] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0051] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0052] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0053] See Figure 1-11 This utility model provides a crimp-type power module signal pin connector, including an insulating shell 1 and an elastic contact assembly 2. The insulating shell 1 has a cavity structure 11, and the elastic contact assembly 2 includes a body structure 20, a radial elastic element, and an axial elastic element.

[0054] The opening of the cavity structure 11 is at the top 1a of the insulating shell 1, and the body structure 20 is housed in the cavity structure 11 of the insulating shell 1.

[0055] The radial elastic element connects to the main body structure 20 and is located in the inner cavity of the main body structure 20. The radial elastic element is used for plug-in connection with the signal pin of the power module.

[0056] An axial elastic element extends along the side of the insulating housing 1 toward the bottom 1b of the insulating housing 1 and then bends to form a pad contact plane B, which is used to fix and connect with the pads on the circuit board.

[0057] Specifically, the power module is an IGBT module (Insulated Gate Bipolar Transistor Module).

[0058] This invention proposes an improved power module assembly method, which uses surface mount technology to install connectors and utilizes a flexible crimp structure to achieve mechanical-electrical connection between signal pins and the circuit board. This simplifies the assembly process, eliminates the need for through-hole soldering and cleaning, increases assembly speed, reduces the risk of signal pin damage, facilitates desoldering, extends service life, and maintains performance stability. The power module can withstand more than 1000 mating cycles with the connector. Furthermore, under 1kHz testing conditions, the connector contact resistance is less than 2mΩ, and testing shows that assembly efficiency is improved by more than 60%.

[0059] Furthermore, the radial elastic element includes a first spring 21 and a second spring 22;

[0060] The first end of the first spring 21 is connected to the first edge of the top opening of the main body structure, and the first spring 21 extends into the inner cavity of the main body structure.

[0061] The first end of the second spring 22 is connected to the second edge of the top opening of the main body structure. The second spring 22 extends into the inner cavity of the main body structure, and the first edge and the second edge are arranged opposite to each other.

[0062] The radial elastic element serves as the upper contact part of the connector. It uses a first spring 21 and a second spring 22 to form a multi-lobed spring sheet. The shortest distance between the first spring 21 and the second spring 22 is less than the diameter of the signal pin to achieve an interference fit and realize a plug-in connection with the signal pin.

[0063] Specifically, the signal pin is the gate signal pin of the IGBT.

[0064] Specifically, the diameter of the gate signal pin is 1.0-2.5mm.

[0065] Specifically, the shortest distance between the first reed 21 and the second reed 22 is less than or equal to 0.5 mm.

[0066] Both the first spring 21 and the second spring 22 are elastic. The connector of this utility model can be adapted to signal pins of different sizes, thus expanding the scope of application of the connector.

[0067] The first spring 21 and the second spring 22 form a V-shape from the top opening of the main body structure to the shortest distance between the first spring 21 and the second spring 22, thereby achieving penetrating clamping of the contact signal needle.

[0068] The height is less than or equal to that of the signal pin, and the signal pin can be installed through the hole to meet the needs of signal pin modules of different heights.

[0069] Specifically, in addition to the interference fit between the radial elastic element and the signal pin, the height dimension of the radial elastic element is less than or equal to that of the signal pin, allowing the signal pin to be installed through the hole, which can meet the needs of signal pins of different heights.

[0070] Furthermore, the axial elastic element includes a third spring 23 and a fourth spring 24;

[0071] The first end of the third reed 23 is connected to the third edge of the top opening of the main body structure 20.

[0072] The first end of the fourth reed 24 is connected to the fourth edge of the top opening of the body structure 20, and the third edge and the fourth edge are arranged opposite to each other;

[0073] After the third spring 23 bends for the first time, it extends along the third side 1c of the insulating housing 1 towards the bottom 1b of the insulating housing. The third spring 23 bends for the second time near the bottom 1b of the insulating housing 1 to form a solder pad contact plane B.

[0074] After the fourth spring 24 bends for the first time, it extends along the fourth side 1d of the insulating housing 1 towards the bottom 1b of the insulating housing. The fourth spring 24 bends for the second time near the bottom 1b of the insulating housing to form a solder pad contact plane B.

[0075] The third side 1c and the fourth side 1d are disposed opposite to each other on the insulating housing 1.

[0076] The first side 1e and the second side 1f of the insulating housing are arranged opposite to each other.

[0077] The axial elastic element serves as the lower contact part of the connector. The axial elastic element includes a third spring 23 and a fourth spring 24. The third spring 23 and the fourth spring 24 are bent from the body structure 20 and extend to the bottom 1b of the insulating shell. They are then bent again to form a pad contact plane B. The pad contact plane B forms a surface contact with the PCB gold-plated pads through SMT mounting soldering technology to achieve an electromechanical connection, thereby enabling the signal pins to be electrically and mechanically connected to the circuit board through the connector.

[0078] The IGBT module can be quickly installed and removed via a crimping method. Applying continuous pressure to the first spring 21 and the second spring 22 enables quick disconnection of the signal pins and connectors.

[0079] Furthermore, the side of the insulating housing 1 is provided with a limiting structure to limit the axial elastic element, and the limiting structure forms a limiting channel;

[0080] The axial elastic element does not contact the side of the insulating housing 1 in the free state, and extends from the top 1a to the bottom 1b of the insulating housing 1 within the limiting channel.

[0081] The limiting structure restricts the axial elastic element from moving within a certain range.

[0082] Furthermore, the limiting channel is formed by the space between the first L-shaped sidewall and the second L-shaped sidewall;

[0083] The first L-shaped sidewall includes: a first sidewall perpendicular to the side of the insulating housing 1, and a second sidewall parallel to the side of the insulating housing;

[0084] The second L-shaped sidewall includes: a third sidewall perpendicular to the side of the insulating housing 1, and a fourth sidewall parallel to the side of the insulating housing;

[0085] The opening distance between the second and fourth sidewalls is smaller than the distance between the first and third sidewalls;

[0086] The width of the axial elastic element is smaller than the distance between the first sidewall and the third sidewall.

[0087] For the limiting channel on the third side 1c of the insulating housing, the first L-shaped sidewall includes: a first sidewall perpendicular to the third side 1c of the insulating housing 1, and a second sidewall parallel to the third side 1c of the insulating housing 1; the second L-shaped sidewall includes: a third sidewall perpendicular to the third side 1c of the insulating housing 1, and a fourth sidewall parallel to the third side 1c of the insulating housing 1.

[0088] For the limiting channel on the fourth side 1d of the insulating housing 1, the first L-shaped sidewall includes: a first sidewall perpendicular to the fourth side 1d of the insulating housing 1, and a second sidewall parallel to the fourth side 1d of the insulating housing 1; the second L-shaped sidewall includes: a third sidewall perpendicular to the fourth side 1d of the insulating housing 1, and a fourth sidewall parallel to the fourth side 1d of the insulating housing 1.

[0089] Furthermore, the insulating housing has two cavity structures 11, each cavity structure 11 corresponding to an elastic contact assembly 2.

[0090] The power module IGBT has two signal pins, so the connector is designed with two cavity structures 11, each cavity structure 11 is connected to one signal pin.

[0091] For the insulating housing 1 with two cavity structures 11, two signal pins can be inserted. The third side 1c of the insulating housing 1 corresponds to two third springs 23, and the fourth side 1d of the insulating housing corresponds to two fourth springs 24.

[0092] In each of the third side 1c and the fourth side 1d of the insulating housing 1, the limiting structure includes two L-shaped limiting blocks 12 and a T-shaped limiting block 13 between the two L-shaped limiting blocks 12. The space between the T-shaped limiting block 13 and one L-shaped limiting block 12 forms a limiting channel, and the space between the T-shaped limiting block 13 and the other L-shaped limiting block 12 forms a limiting channel, thus forming two limiting channels. Specifically, on each of the third side 1c and the fourth side 1d of the insulating housing 1, the L-shaped limiting block 12 forms a first L-shaped sidewall, and the two sides of the T-shaped limiting block 13 form second L-shaped sidewalls. The space between one second L-shaped sidewall of the T-shaped limiting block 13 and the first L-shaped sidewall of the opposite L-shaped limiting block 12 forms a limiting channel, and the space between the other second L-shaped sidewall of the T-shaped limiting block 13 and the first L-shaped sidewall of the opposite L-shaped limiting block 12 forms another limiting channel.

[0093] Furthermore, the main body structure 20 has openings 25 on the first side where the first edge is located and on the second side where the second edge is located.

[0094] Furthermore, the body structure 20 has a plurality of openings 25 arranged along the top to the bottom of the body structure 20 on the first side where the first edge is located.

[0095] The body structure 20 has a plurality of openings 25 arranged along the top to the bottom of the body structure 20 on the second side where the second edge is located.

[0096] The opening is designed primarily for stress relief, facilitating deformation of the first spring 21 and the second spring.

[0097] Furthermore, the elastic contact component 2 is made of conductive metal.

[0098] Conductive metals such as copper or copper alloys.

[0099] Furthermore, the insulating housing 1 is injection molded using polyphenylene sulfide or liquid crystal polymer.

[0100] Specifically, the insulating shell 1 uses an insulating and heat-resistant material with a temperature resistance of 150°C or higher, such as PPS (polyphenylene sulfide) or LCP (liquid crystal polymer).

[0101] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A crimp-type power module signal pin connector, characterized in that, It includes an insulating shell and an elastic contact assembly, wherein the insulating shell has a cavity structure, and the elastic contact assembly includes a body structure, a radial elastic element, and an axial elastic element; The opening of the cavity structure is at the top of the insulating housing, and the body structure is housed within the cavity structure of the insulating housing; The radial elastic element is connected to the body structure and located in the inner cavity of the body structure. The radial elastic element is used for plug-in connection with the signal pin of the power module. The axial elastic element extends along the side of the insulating housing toward the bottom of the insulating housing and then bends to form a pad contact plane, which is used to fix and connect with the pads on the circuit board.

2. The crimp-type power module signal pin connector as described in claim 1, characterized in that, The radial elastic element includes a first spring and a second spring; The first end of the first spring is connected to the first edge of the top opening of the body structure, and the first spring extends into the inner cavity of the body structure. The first end of the second spring is connected to the second edge of the top opening of the body structure, and the second spring extends into the inner cavity of the body structure, with the first edge and the second edge being disposed opposite to each other.

3. The crimp-type power module signal pin connector as described in claim 1, characterized in that, The axial elastic element includes a third spring and a fourth spring; The first end of the third spring is connected to the third edge of the top opening of the body structure. The first end of the fourth reed is connected to the fourth edge of the top opening of the body structure, and the third edge and the fourth edge are arranged opposite to each other; After the third spring bends for the first time, it extends along the third side of the insulating housing toward the bottom of the insulating housing. The third spring bends for the second time near the bottom of the insulating housing to form a contact plane for the solder pad. After the fourth spring bends for the first time, it extends along the fourth side of the insulating housing toward the bottom of the insulating housing. The fourth spring bends for the second time near the bottom of the insulating housing to form a contact plane for the solder pad. The third side and the fourth side are disposed opposite to each other on the insulating housing.

4. A crimp-type power module signal pin connector as described in claim 1, characterized in that, The insulating shell is provided with a limiting structure on its side to limit the axial elastic element, and the limiting structure forms a limiting channel. The axial elastic element does not contact the side of the insulating housing in the free state, and extends from the top to the bottom of the insulating housing within the limiting channel.

5. A crimp-type power module signal pin connector as described in claim 4, characterized in that, The limiting channel is formed by the space between the first L-shaped sidewall and the second L-shaped sidewall; The first L-shaped sidewall includes: a first sidewall perpendicular to the side portion of the insulating housing, and a second sidewall parallel to the side portion of the insulating housing; The second L-shaped sidewall includes: a third sidewall perpendicular to the side portion of the insulating housing, and a fourth sidewall parallel to the side portion of the insulating housing; The opening distance between the second sidewall and the fourth sidewall is smaller than the distance between the first sidewall and the third sidewall; The width of the axial elastic element is smaller than the distance between the first sidewall and the third sidewall.

6. A crimp-type power module signal pin connector as described in claim 1, characterized in that, The insulating housing has two cavity structures, each cavity structure corresponding to one elastic contact assembly.

7. A crimp-type power module signal pin connector as described in claim 2, characterized in that, The main body structure has openings on the first side where the first edge is located and on the second side where the second edge is located.

8. A crimp-type power module signal pin connector as described in claim 7, characterized in that, The main body structure has a plurality of openings arranged along the top to the bottom of the main body structure on the first side where the first edge is located; The main body structure has a plurality of openings arranged along the top to the bottom of the main body structure on the second side where the second edge is located.

9. A crimp-type power module signal pin connector as described in claim 1, characterized in that, The elastic contact assembly is made of conductive metal.

10. A crimp-type power module signal pin connector as described in claim 1, characterized in that, The insulating shell is injection molded using polyphenylene sulfide or liquid crystal polymer.

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