A large-current field-stop IGBT power device with a stepped trench gate structure

Abstract

The utility model provides a kind of large current field cutoff IGBT power device with ladder type trench gate structure, it is related to IGBT technical field, including ladder type trench gate IGBT main body;The top left side position of ladder type trench gate IGBT main body is provided with a foot, and the top middle position of ladder type trench gate IGBT main body is provided with two feet.By being provided with the limiting frame of limiting claw and adjusting seat in the top of a foot, two feet, three feet, adjusting seat is rotated, and limiting claw is moved and is adhered to clamping with bolt piece outside by spiral thread, the stable limiting structure of bolt piece is formed, effectively prevent bolt piece from loosening due to vibration, temperature change and other factors during device working process, ensure that external wire and pin maintain good contact all the time.The problem that bolt piece is prone to loosening after external wire and a foot, two feet, three feet are connected and fixed by bolt piece in the use process of existing large current field cutoff IGBT power device is influenced by vibration, temperature change and other factors during device working, and bolt piece is prone to loosening.

Description

Technical Field

[0001] This utility model belongs to the field of IGBT technology, and more specifically, it relates to a high current field cutoff IGBT power device with a stepped trench gate structure. Background Technology

[0002] IGBT power devices are widely used in industrial control, rail transit, power system control, electric vehicles, energy-saving home appliances and other fields, and have advantages such as high input impedance, low on-state voltage drop, high withstand voltage, high current carrying capacity and fast switching speed.

[0003] Application number CN202420156962.5 discloses a high-current trench gate field-stop IGBT power device, comprising: a heavily doped first conductivity type substrate; a heavily doped second conductivity type collector region on the back side of the first conductivity type substrate, and a collector metal on the back side of the second conductivity type collector region; a first conductivity type buffer layer on the front side of the first conductivity type substrate; a lightly doped first conductivity type epitaxial layer on the first conductivity type buffer layer; a gate trench, a lightly doped second conductivity type body region, and a voltage divider ring at the top of the first conductivity type epitaxial layer; wherein the gate trench and the second conductivity type body region are located in the active region of the device, and the voltage divider ring is located in the terminal protection region of the device; multiple gate trenches are arranged in parallel, and a second conductivity type body region is provided on both sides of the multiple parallel gate trenches; the number of voltage divider rings is at least one; this invention has the advantages of high reverse breakdown voltage and large forward current capability.

[0004] Based on the above patent search and understanding of the application of existing high current field cutoff IGBT power devices: During the use of high current field cutoff IGBT power devices, after the external wires are connected and fixed to pins one, two, and three with bolts, the bolts are prone to loosening due to factors such as vibration and temperature changes during device operation. This can lead to poor contact between the wires and pins, affecting the stability of current transmission in the device, and even causing device failure. In traditional bolted connections, to ensure a secure connection, the bolts need to be screwed too deeply into the threaded holes of the leads. This not only increases the difficulty of bolt installation but may also damage the threaded holes due to over-tightening. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a high-current field cutoff IGBT power device with a stepped trench gate structure. This solves the problem that in existing high-current field cutoff IGBT power devices, after the external conductors are connected and fixed to pins one, two, and three via bolts, the bolts are prone to loosening due to vibrations and temperature changes during device operation. This leads to poor contact between the conductors and pins, affecting the stability of current transmission and potentially causing device failure. Furthermore, in traditional bolt connections, to ensure a secure connection, the bolts need to be excessively screwed into the threaded holes of the pins, increasing the difficulty of bolt installation and potentially damaging the threaded holes due to over-tightening.

[0006] The technical solution adopted in this utility model is as follows: A high-current field cutoff IGBT power device with a stepped trench gate structure includes a stepped trench gate IGBT body. One foot is located on the top left side of the stepped trench gate IGBT body, two feet are located in the top middle position, and three feet are located on the top right side. The spacing between any two adjacent feet is the same. A limiting bracket is fixedly installed at the top middle position of each of the three feet. The middle position of the limiting bracket is a through-type design, and the top position of the limiting bracket has three sliding grooves. The spacing between any two adjacent sliding grooves of the three limiting brackets is the same. A limiting claw is slidably connected in each of the three sliding grooves of the limiting bracket. An arc-shaped pattern is provided at the bottom position of each limiting claw. An adjusting seat is rotatably fitted onto the outer side of the limiting bracket. The top position of the adjusting seat has a spiral pattern, and the spiral pattern of the adjusting seat engages with the arc-shaped pattern of the three limiting claws in the sliding grooves of the limiting bracket.

[0007] According to one embodiment of the present invention, threaded holes are provided at the top middle positions of the first foot, the second foot, and the third foot, and a bolt is rotatably connected in the threaded holes of the first foot, the second foot, and the third foot.

[0008] According to one embodiment of the present invention, four feet are fixedly installed at the front right position of the top right side of the stepped grooved gate IGBT body, and five feet are fixedly installed at the front middle right position of the top right side of the stepped grooved gate IGBT body.

[0009] According to one embodiment of the present invention, six feet are fixedly installed at the rear right side of the top of the stepped grooved gate IGBT body, and seven feet are fixedly installed at the middle rear right side of the top of the stepped grooved gate IGBT body.

[0010] According to one embodiment of the present invention, the three bolts are respectively inserted through the middle position of a limiting frame, and the outer positions of the bolts are all in contact with the inner positions of the three limiting claws.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting a limiting frame with a limiting claw and an adjusting seat on the top of the first, second, and third feet, rotating the adjusting seat can drive the limiting claw to move and clamp it against the outside of the bolt, forming a stable limiting structure for the bolt. This effectively prevents the bolt from loosening due to vibration, temperature changes, or other factors during device operation, ensuring that the external wires and pins always maintain good contact, guaranteeing the stability of current transmission in IGBT power devices, and reducing the failure rate.

[0012] 2. The three limiting claws can position and clamp the bolts at any time, achieving a firm fixation without excessively screwing the bolts into the pin thread holes. This simplifies the bolt installation process, reduces the difficulty of installation and positioning, and improves installation efficiency. On the other hand, it avoids damage to the thread holes caused by excessive screwing, extends the service life of the pins and thread holes, and improves the overall structural reliability of the device. Attached Figure Description

[0013] Figure 1 This is a top view schematic diagram of the high current field cutoff IGBT power device with a stepped trench gate structure according to this utility model.

[0014] Figure 2 This is a side view schematic diagram of the high current field cutoff IGBT power device with a stepped trench gate structure according to this utility model.

[0015] Figure 3 This is a schematic diagram of the split half-section side view of the high current field cutoff IGBT power device with a stepped trench gate structure according to this utility model.

[0016] Figure 4 This is the utility model Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0017] Figure 5 This is a schematic diagram of the internal circuit structure of the high-current field cutoff IGBT power device with a stepped trench gate structure according to this utility model.

[0018] In the diagram, the correspondence between component names and drawing numbers is as follows: 1. Stepped grooved grid IGBT body; 101, one foot; 102, two feet; 103, three feet; 104, four feet; 105, five feet; 106, six feet; 107, seven feet; 2. Limiting bracket; 201, adjusting seat; 202, limiting claw; 3. Bolts. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0020] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The use of terms such as "a," "an," or "the" in this utility model patent application specification and claims does not indicate a quantity limitation, but rather indicates the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0021] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0022] Example: As attached Figure 1 To be continued Figure 5 As shown: This utility model provides a high-current field cutoff IGBT power device with a stepped trench gate structure, including a stepped trench gate IGBT body 1; a first leg 101 is provided on the top left side of the stepped trench gate IGBT body 1, a second leg 102 is provided on the top middle position of the stepped trench gate IGBT body 1, and a third leg 103 is provided on the top right side of the stepped trench gate IGBT body 1. The spacing between each adjacent pair of the first leg 101, the second leg 102, and the third leg 103 is the same. A limiting frame 2 is fixedly installed at each position. The middle position of the limiting frame 2 is designed to be through, and the top position of the limiting frame 2 is provided with three sliding grooves. The spacing between each pair of adjacent sliding grooves of the limiting frame 2 is the same. A limiting claw 202 is slidably connected in each of the three sliding grooves of the limiting frame 2. The bottom position of each limiting claw 202 is provided with arc-shaped patterns. An adjusting seat 201 is sleeved and rotated on the outer side of the limiting frame 2. The top position of the adjusting seat 201 is provided with spiral patterns, and the spiral patterns of the adjusting seat 201 engage with the arc-shaped patterns of the three limiting claws 202 in the sliding grooves of the limiting frame 2.

[0023] Among them, threaded holes are opened at the top middle position of one foot 101, two feet 102 and three feet 103, and a bolt 3 is rotatably connected in the threaded holes of one foot 101, two feet 102 and three feet 103.

[0024] Among them, four feet 104 are fixedly installed at the front right side of the top of the stepped trench gate IGBT body 1, and five feet 105 are fixedly installed at the front middle right side of the top of the stepped trench gate IGBT body 1.

[0025] Among them, a six-pin 106 is fixedly installed at the rear right side of the top of the stepped trench gate IGBT body 1, and a seven-pin 107 is fixedly installed at the middle rear right side of the top of the stepped trench gate IGBT body 1.

[0026] Among them, three bolts 3 are respectively inserted through the middle position of a limiting frame 2, and the outer side of the bolts 3 are all in contact with the inner side of the three limiting claws 202.

[0027] When using: For wiring preparation, connect the external wires to the corresponding pins 104, 105, 106, and 107 of the stepped trench gate IGBT body 1 device. Select the appropriate pins for wiring according to the requirements. Screw the bolt 3 into the threaded holes corresponding to the first leg 101, the second leg 102, and the third leg 103, so that the bolt 3 passes through the middle position of the limiting frame 2, and initially fix the connection between the external wire and the first leg 101, the second leg 102, and the third leg 103.

[0028] Rotate the adjusting seat 201 on the outside of the limiting bracket 2. The adjusting seat 201 drives the limiting claw 202 in the sliding groove of the limiting bracket 2 to move through the spiral pattern until the inner side of the limiting claw 202 fits and clamps the outer side of the bolt 3. This prevents the bolt 3 from becoming loose after installation. At the same time, depending on the screwing conditions of the bolt 3, the three limiting claws 202 can be used to position and tighten the bolt 3 at any time without requiring the bolt 3 to be screwed in too much.

[0029] Although this application has been described with reference to the foregoing embodiments, those skilled in the art will understand that various changes can be made without departing from the spirit and scope of this application as defined by the appended claims. While this specification contains details of many specific implementations, these should not be construed as limiting the scope of the claims, but rather as descriptions of features specific to particular embodiments. The scope of this application is defined by the appended claims and their equivalents, and is not limited to the embodiments described above.

Claims

1. A high-current field cutoff IGBT power device with a stepped trench gate structure, characterized in that: The system includes a stepped grooved IGBT body (1); a foot (101) is provided on the top left side of the stepped grooved IGBT body (1), a second foot (102) is provided on the top middle position of the stepped grooved IGBT body (1), and a third foot (103) is provided on the top right side of the stepped grooved IGBT body (1). The spacing between each pair of adjacent feet (101, 102, and 103) is the same. A limiting bracket (2) is fixedly installed at the top middle position of each of the feet (101, 102, and 103). The middle position of the limiting frame (2) is designed to be through, and the top position of the limiting frame (2) is provided with three sliding grooves. The spacing between each pair of adjacent sliding grooves of the limiting frame (2) is the same. A limiting claw (202) is slidably connected in each of the three sliding grooves of the limiting frame (2). The bottom position of each limiting claw (202) is provided with an arc-shaped pattern. An adjusting seat (201) is sleeved and rotated on the outer side of the limiting frame (2). The top position of the adjusting seat (201) is provided with a spiral pattern, and the spiral pattern of the adjusting seat (201) engages with the arc-shaped pattern of the three limiting claws (202) in the sliding groove of the limiting frame (2).

2. The high-current field cutoff IGBT power device with a stepped trench gate structure as described in claim 1, characterized in that: Threaded holes are provided at the top middle position of the first foot (101), the second foot (102), and the third foot (103), and a bolt (3) is rotatably connected in the threaded holes of the first foot (101), the second foot (102), and the third foot (103).

3. The high-current field cutoff IGBT power device with a stepped trench gate structure as described in claim 1, characterized in that: The stepped grooved IGBT body (1) has four feet (104) fixedly installed at the front right side of the top, and five feet (105) fixedly installed at the front middle right side of the top.

4. The high-current field cutoff IGBT power device with a stepped trench gate structure as described in claim 1, characterized in that: The stepped grooved IGBT body (1) has six feet (106) fixedly installed at the rear right side of the top, and seven feet (107) fixedly installed at the rear middle right side of the top.

5. The high-current field cutoff IGBT power device with a stepped trench gate structure as described in claim 2, characterized in that: The three bolts (3) are respectively inserted through the middle position of a limiting bracket (2), and the outer positions of the bolts (3) are all in contact with the inner positions of the three limiting claws (202).

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