Flexible contact switching mechanism and IGBT test equipment

Abstract

The utility model discloses a flexible contact switching mechanism and IGBT test equipment. The flexible contact switching mechanism comprises a support, a static contact module, a top moving contact module and a bottom moving contact module. A first fixing plate, a second fixing plate, a first clamping plate and a second clamping plate are installed on the support, and the first clamping plate is located between the first fixing plate and the second fixing plate. The static contact module comprises top-layer static contacts, bottom-layer static contacts and a contact plate, the plurality of top-layer static contacts are arranged on the contact plate, the plurality of bottom-layer static contacts are arranged at the bottom of the contact plate, and the contact plate is located between the first clamping plate and the second clamping plate; the top moving contact module comprises a plurality of top contact assemblies, and the contact assemblies are installed below the first fixing plate and can elastically abut against the top-layer static contacts. The bottom moving contact module comprises a plurality of bottom contact assemblies, and the bottom contact assemblies are installed on the second fixing plate and can elastically abut against the bottom layer static contacts. Flexible connection is adopted, the contact area is increased, contacts are prevented from being damaged, and the service life of the contacts is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of IGBT testing equipment, in particular to a flexible contact switching mechanism and an IGBT testing equipment with the flexible contact switching mechanism. Background Art

[0002] As a switching component used in high-power and high-efficiency occasions, IGBT modules (Insulated Gate Bipolar Transistor) not only play a major role in new energy vehicles, but also are responsible for the core function of variable frequency speed regulation in high-speed rail motors. IGBT dynamic and static testing is an important part of the IGBT module production process. For IGBT dynamic and static testing equipment, the contact switching mechanism is its core module. At present, the contact switching mechanism is usually a rigid connection, which basically meets the dynamic and static parameter test, but it cannot meet the use requirements when it comes to the conduction of high voltage and large current, which will increase the risk of contact damage. The main problems are: first, the surface flatness requirements of the dynamic and static contacts are extremely high, and the processing is difficult; second, the dynamic and static contacts lack buffering at the moment of contact, which will accelerate the wear of the contacts and reduce the service life of the contacts; third, when the contacts are not in good contact, the contact resistance will increase exponentially, resulting in electric shock and sparking, thereby damaging the contacts. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a flexible contact switching mechanism and an IGBT testing device, which optimizes the rigid connection of the contact to a flexible connection, increases the contact area of ​​the dynamic and static contacts, reduces the contact resistance, improves the ability to conduct high voltage and high current, avoids damage to the contact, and increases the service life of the contact.

[0004] An embodiment of the utility model provides a flexible contact switching mechanism, including a bracket, a static contact module, a top moving contact module and a bottom moving contact module; a first fixed plate, a second fixed plate, a first clamping plate and a second clamping plate are installed on the bracket, the first clamping plate is located between the first fixed plate and the second fixed plate, and the second clamping plate is arranged under the first clamping plate; the static contact module includes a top static contact, a bottom static contact and a contact plate, a plurality of the top static contacts are arranged on the contact plate, a plurality of the bottom static contacts are arranged at the bottom of the contact plate, and the contact plate is located between the first clamping plate and the second clamping plate; the top moving contact module includes a plurality of top contact assemblies, the top contact assemblies are installed under the first fixed plate and can elastically abut against the top static contact; the bottom moving contact module includes a plurality of bottom contact assemblies, the bottom contact assemblies are installed on the second fixed plate and can elastically abut against the bottom static contact.

[0005] The embodiments of the present invention have at least the following beneficial effects:

[0006] The flexible contact switching mechanism provided by the utility model adopts an upper and lower double-layer structure with a compact structure and a small required installation space, thus saving installation space; the rigid connection of the contacts is optimized into a flexible connection, and the top moving contact module and the bottom moving contact module move up and down independently without interfering with each other, thus making up for the height difference of the static contact module caused by processing or assembly, reducing the processing difficulty of the contacts and saving production costs; the top contact assembly elastically abuts against the top static contact, and the bottom contact assembly elastically abuts against the bottom static contact, which can play a certain buffering role on the contact of the contacts, reduce the relative wear between the moving and static contacts, and improve the durability of the contacts; and promote the moving and static contacts to fit firmly, increase the contact area, reduce the contact resistance, increase the current conduction performance, reduce the risk of contact sparking, avoid damage to the contacts, and improve the service life of the contacts.

[0007] According to some embodiments of the present utility model, the top contact assembly includes a contact, a contact connection block and a driving cylinder, the contact is connected to the contact connection block, and the contact connection block is arranged at the output end of the driving cylinder.

[0008] According to some embodiments of the present utility model, two flexible connectors are arranged under the contact connection block, and the contact connection block is flexibly connected to the contacts through the flexible connectors.

[0009] According to some embodiments of the utility model, the flexible connector includes a compression spring, a guide shaft and a guide sleeve, the compression spring is sleeved on the guide shaft and connected to the guide sleeve, and the guide shaft passes through the contact connection block.

[0010] According to some embodiments of the present invention, the guide shaft and the guide sleeve are both conical structures.

[0011] According to some embodiments of the present invention, a flexible braided belt is provided between the flexible connector and the contact.

[0012] According to some embodiments of the present invention, the first clamping plate is provided with a plurality of through slots, and the size of the through slots is adapted to the contact.

[0013] According to some embodiments of the present invention, a plurality of metal springs are further provided on the contact plate, and the plurality of metal springs are distributed on the contact plate in a rectangular shape.

[0014] According to some embodiments of the present invention, the metal spring is a beryllium copper spring.

[0015] According to the IGBT testing device of the embodiment of the utility model, the IGBT testing device includes the above-mentioned flexible contact switching mechanism.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 This is a structural schematic diagram of a flexible contact switching mechanism according to an embodiment of the utility model;

[0019] Figure 2 for Figure 1 A structural schematic diagram of a stationary contact module of a flexible contact switching mechanism is shown;

[0020] Figure 3 for Figure 1 A schematic structural diagram of a top contact assembly of a top moving contact module of a flexible contact switching mechanism is shown;

[0021] Figure 4 for Figure 1 A cross-sectional view of a top contact assembly of a top movable contact module of a flexible contact switching mechanism is shown.

[0022] Reference numerals:

[0023] The bracket 100, the first fixing plate 110, the second fixing plate 120, the first clamping plate 130, the through slot 131, and the second clamping plate 140;

[0024] Static contact module 200, top static contact 210, bottom static contact 220, contact plate 230, metal spring 231;

[0025] Top moving contact module 300, top contact assembly 310, contact 311, contact connection block 312, drive cylinder 313, flexible connection piece 314, compression spring 315, guide shaft 316, guide sleeve 317, flexible braided belt 318;

[0026] Bottom moving contact module 400 and bottom contact assembly 410 . DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present utility model, "several" means one or more, "multiple" means more than two, greater than, less than, and exceeding are understood as not including the number itself, and "above", "below", and "within" are understood as including the number itself. If there is a description of "first", "second", etc., it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present utility model, unless otherwise clearly defined, words such as “set,” “install,” “connect,” and “connected” should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above words in the present utility model based on the specific content of the technical solution.

[0031] The technical solution of the utility model is described in detail below through the accompanying drawings and specific embodiments:

[0032] Please refer to Figure 1 and Figure 2The present embodiment discloses a flexible contact switching mechanism, including a bracket 100, a static contact module 200, a top moving contact module 300 and a bottom moving contact module 400; a first fixing plate 110, a second fixing plate 120, a first clamping plate 130 and a second clamping plate 140 are installed on the bracket, the first clamping plate 130 is located between the first fixing plate 110 and the second fixing plate 120, and the second clamping plate 140 is arranged below the first clamping plate 130; the static contact module 200 includes a top static contact 210, a bottom static contact 220 and a contact plate 230, and a plurality of top static contacts 210 is arranged on the contact plate 230, and a plurality of bottom static contacts 220 are arranged at the bottom of the contact plate 230, and the contact plate 230 is located between the first clamping plate 130 and the second clamping plate 140; the top moving contact module 300 includes a plurality of top contact assemblies 310, which are installed under the first fixing plate 110 and can elastically abut against the top static contact 210; the bottom moving contact module 400 includes a plurality of bottom contact assemblies 410, which are installed on the second fixing plate 120 and can elastically abut against the bottom static contact 220. The upper and lower double-layer structure is adopted, the number of moving contacts and static contacts is multiple groups, the module structure is compact, the required installation space is small, and the installation space is saved; the top moving contact module 300 and the bottom moving contact module 400 move up and down independently, do not interfere with each other, and make up for the height difference caused by the processing or assembly of the static contact module; it can realize the conduction of high voltage and large current, reduce the processing difficulty of the moving and static contacts, and save production costs.

[0033] Please refer to Figure 3 The top contact assembly 310 includes a contact 311, a contact connection block 312 and a driving cylinder 313. The contact 311 is connected to the contact connection block 312, and the contact connection block 312 is arranged at the output end of the driving cylinder 313. Two flexible connectors 314 are arranged below the contact connection block 312, and the contact connection block 312 is flexibly connected to the contact 311 through the flexible connectors 314. The structure of the bottom contact assembly 410 is the same as that of the top contact assembly 310.

[0034] Please refer to Figure 3 and Figure 4The flexible connector 314 includes a compression spring 315, a guide shaft 316 and a guide sleeve 317. The compression spring 315 is sleeved on the guide shaft 316 and connected to the guide sleeve 317. The guide shaft 316 is inserted into the contact connection block 312. The guide shaft 316 and the guide sleeve 317 are both conical structures. A flexible braided belt 318 is provided between the flexible connector 314 and the contact 311. The compression spring 315 can provide a partial buffering function at the moment of contact between the moving and static contacts, reduce the wear of the moving and static contacts caused by collision, and increase the service life of the contacts. The guide shaft and the guide sleeve are conical structures, which can improve the repeatability of the moving contact after contraction. The flexible braided belt is selected as the connection carrier to make the entire mechanism more flexible and compatible with the height difference caused by the processing or assembly of the static contacts.

[0035] Please refer to Figure 1 The first clamping plate 130 is provided with a plurality of through slots 131 , and the size of the through slots 131 is adapted to the contact 311 , so that the contact 311 can pass through the through slots 131 and contact the top static contact 210 .

[0036] Please refer to Figure 2 The contact plate 230 is also provided with a plurality of metal springs 231 , which are distributed on the contact plate in a rectangular shape; the metal springs 231 are beryllium copper springs.

[0037] This embodiment also provides an IGBT testing device, including the above-mentioned flexible contact switching mechanism.

[0038] According to the different test requirements of different IGBTs, the top moving contact module 300 and the bottom moving contact module 400 are connected to the static contact module 200 one by one according to a certain test logic, so as to realize the conduction of different circuits, and then complete the dynamic and static parameter test. Exemplarily, the top moving contact module 300 and the bottom moving contact module 400 have 7 groups of moving contacts, and the top static contact 210 and the bottom static contact 220 are also 7 groups, corresponding one to one. When the host computer receives the test command, the host computer drives the top contact assembly 310 and the bottom contact assembly 410 of the contact one by one to act according to a certain timing. When the moving and static contacts are in good contact, a group of conductors is formed, thereby realizing the conduction of current. The current passes through the moving and static contacts, flows to the metal spring 231, then flows to the test fixture, and finally reaches the product to be tested, thereby forming a complete circuit, and then the dynamic and static functional test of the IGBT is completed through the corresponding probe of the oscilloscope.

[0039] The flexible contact switching mechanism provided by the utility model adopts an upper and lower double-layer structure with a compact structure and a small required installation space, thus saving installation space. The rigid connection of the contacts is optimized into a flexible connection, and the top moving contact module 300 and the bottom moving contact module 400 move up and down independently without interfering with each other. The top contact assembly 310 elastically abuts against the top static contact 210, and the bottom contact assembly 410 elastically abuts against the bottom static contact 220, which has a certain buffering effect on the contact between the moving and static contacts, reduces the relative wear between the moving and static contacts, and improves the durability of the switching contacts. Under the action of the driving cylinder 313, the top contact assembly 310 and the bottom contact assembly 410 promote the moving and static contacts to fit firmly, increase the contact area, reduce the contact resistance, increase the current conduction performance, and can achieve the conduction of high voltage and large current, reduce the risk of contact sparking, and improve the service life of the contacts. A flexible braided belt 318 is selected as a connection carrier, thereby making the entire mechanism more flexible, compensating for the height difference of the static contact module 200 caused by processing or assembly, reducing the processing difficulty of each contact, and saving production costs; the compression spring 315 can provide partial buffering function at the moment of contact between the dynamic and static contacts, reduce the wear of the dynamic and static contacts caused by collision, and increase the service life of the contacts; increase the contact area of ​​the dynamic and static contacts, reduce the contact resistance, and thus reduce the risk of equipment ignition.

[0040] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A flexible contact switching mechanism, characterized in that: include: A bracket (100), wherein a first fixing plate (110), a second fixing plate (120), a first clamping plate (130) and a second clamping plate (140) are mounted on the bracket, wherein the first clamping plate (130) is located between the first fixing plate (110) and the second fixing plate (120), and the second clamping plate (140) is arranged below the first clamping plate (130); A static contact module (200), the static contact module (200) comprising a top static contact (210), a bottom static contact (220) and a contact plate (230), a plurality of the top static contacts (210) being arranged on the contact plate (230), a plurality of the bottom static contacts (220) being arranged at the bottom of the contact plate (230), and the contact plate (230) being located between the first clamping plate (130) and the second clamping plate (140); A top moving contact module (300), the top moving contact module (300) comprising a plurality of top contact assemblies (310), the top contact assemblies (310) being installed below the first fixing plate (110) and being capable of elastically abutting against the top static contact (210); A bottom moving contact module (400), the bottom moving contact module (400) comprising a plurality of bottom contact assemblies (410), the bottom contact assemblies (410) being mounted on the second fixing plate (120) and being capable of elastically abutting against the bottom static contacts (220).

2. The flexible contact switching mechanism according to claim 1, characterized in that: The top contact assembly (310) comprises a contact (311), a contact connection block (312) and a driving cylinder (313); the contact (311) is connected to the contact connection block (312); and the contact connection block (312) is arranged at the output end of the driving cylinder (313).

3. The flexible contact switching mechanism according to claim 2, characterized in that: Two flexible connectors (314) are arranged below the contact connection block (312), and the contact connection block (312) is flexibly connected to the contact (311) via the flexible connectors (314).

4. The flexible contact switching mechanism according to claim 3, characterized in that: The flexible connecting member (314) comprises a compression spring (315), a guide shaft (316) and a guide sleeve (317); the compression spring (315) is sleeved on the guide shaft (316) and connected to the guide sleeve (317); and the guide shaft (316) is passed through the contact connection block (312).

5. The flexible contact switching mechanism according to claim 4, characterized in that: The guide shaft (316) and the guide sleeve (317) are both conical structures.

6. The flexible contact switching mechanism according to claim 3, characterized in that: A flexible braided belt (318) is provided between the flexible connecting piece (314) and the contact (311).

7. The flexible contact switching mechanism according to claim 2, characterized in that: The first clamping plate (130) is provided with a plurality of through slots (131), and the size of the through slots (131) is adapted to the contact (311).

8. The flexible contact switching mechanism according to claim 7, characterized in that: A plurality of metal springs (231) are also provided on the contact plate (230), and the plurality of metal springs (231) are distributed on the contact plate in a rectangular shape.

9. The flexible contact switching mechanism according to claim 8, characterized in that: The metal shrapnel (231) is a beryllium copper shrapnel.

10. An IGBT testing device, characterized in that: The IGBT testing device comprises the flexible contact switching mechanism according to any one of claims 1 to 9.

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