Gate self-clamping single tube structure

Abstract

The present invention relates to a single-tube structure, and in particular to a gate self-clamping single-tube structure. According to the technical solution provided by the present invention, the gate self-clamping single-tube structure includes a single-tube frame of a plastic-encapsulated gate-controlled device; and also includes a TSV unit for gate self-clamping, wherein the TVS unit is electrically connected to the gate end of the gate-controlled device in the plastic-encapsulated single-tube frame and the gate clamping matching end of the gate-controlled device. The present invention can clamp the gate of a single tube within a safe voltage range to avoid the impact of static electricity or other overshoot voltages in the circuit; so that the subsequent circuit design does not need to consider gate protection, thereby reducing the subsequent design cost, and then avoiding the use of gate protection devices, meeting the application needs in the single-tube field.

Description

Technical Field

[0001] The invention relates to a single tube structure, in particular to a grid self-clamping single tube structure. Background Art

[0002] Single tube is one of the most widely used products in the current semiconductor power field, with low packaging cost, mature packaging technology and wide application.

[0003] Gate-controlled devices, such as IGBT (Insulated Gate Bipolar Transistor) and DMOS (Diffused Metal-Oxide Semi-conductor), are widely used in industries and other fields. However, the gate voltage resistance of gate-controlled devices is limited. Once the gate is subjected to a high voltage shock, it will burn the gate, causing the gate to fail, and then the gate-controlled device will fail and fail to work. There is a certain risk of gate failure during the design, installation and use of gate-controlled devices, and these failure risks mainly come from gate failure caused by static electricity or overvoltage in other circuits.

[0004] Therefore, in more important application fields, such as frequency conversion, subway, high-speed rail and solar motor, additional gate protection devices are generally added to the device to protect the gate from static electricity or other high-voltage shocks. The added gate protection device can protect the gate safety of the gate-controlled device, but it also increases the cost of the equipment and the size of the equipment.

[0005] In the application field of single tube, low cost and miniaturization are currently pursued. Therefore, adding additional gate protection design will increase the cost on the one hand, and make it difficult to further reduce the size of equipment and circuits on the other hand, which is seriously inconsistent with the application requirements of the existing single tube field. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a gate self-clamping single-tube structure, which can clamp the gate of the single tube within a safe voltage range to protect it from static electricity or other overshoot voltages in the circuit; so that subsequent circuit design no longer needs to consider gate protection, thereby reducing subsequent design costs and avoiding the use of gate protection devices, thereby meeting the application needs in the single-tube field.

[0007] According to the technical solution provided by the present invention, the gate self-clamping single-tube structure includes a single-tube frame of a plastic-encapsulated gate-controlled device; it also includes a TSV unit for gate self-clamping, and the TVS unit is electrically connected to the gate end of the gate-controlled device in the plastic-encapsulated single-tube frame and the gate clamping matching end of the gate-controlled device.

[0008] The TVS unit includes a bidirectional TVS tube or a unidirectional TVS tube, wherein:

[0009] When the TVS unit is a bidirectional TVS tube, a bidirectional gate clamp is performed on a gate-controlled device with a single tube frame plastic package; when the TVS unit is a unidirectional TVS tube, a forward or reverse clamp is performed on a gate-controlled device with a single tube frame plastic package.

[0010] The single tube frame includes a frame body and a device terminal group located on one side of the frame body, wherein:

[0011] A clamping groove for allowing the TVS unit to be embedded is arranged on the frame body. After the TVS unit is placed in the clamping groove, the TVS unit is electrically connected to the gate end of the gate-controlled device and the gate clamping matching end of the gate-controlled device.

[0012] A gate lead-out connection terminal for leading out the gate control device and a gate clamp matching lead-out connection terminal for leading out the gate clamp matching terminal of the gate control device are arranged in the clamping groove, and the gate lead-out connection terminal and the gate clamp matching lead-out connection terminal are exposed through the clamping groove;

[0013] The TVS unit placed in the clamping groove is respectively welded and electrically connected to the gate lead-out connection terminal and the gate clamp matching lead-out connection terminal, so that the TVS unit is electrically connected to the gate terminal of the gate-controlled device and the gate clamp matching terminal of the gate-controlled device.

[0014] The device terminal group includes a frame gate terminal, a frame device third terminal and a frame gate clamping matching terminal arranged in sequence, wherein the frame gate terminal, the frame device third terminal and the frame gate clamping matching terminal are parallel to each other;

[0015] The gate lead-out connection end is electrically connected to the frame gate terminal located inside the frame body, the gate clamp matching lead-out connection end is electrically connected to the frame gate clamp matching terminal located inside the frame body, and the gate lead-out connection end, the gate clamp matching lead-out connection end and the third terminal of the frame device are insulated and isolated from each other.

[0016] The gate lead-out connection end is electrically connected to the frame gate terminal through the gate terminal lead-out connector, and the gate clamp matching lead-out connection end is electrically connected to the frame gate clamp matching terminal through the gate clamp matching lead-out connector, wherein:

[0017] The gate terminal lead-out connector is perpendicular to the gate lead-out connection end and the frame gate terminal, and the gate clamp matching lead-out connector is perpendicular to the gate clamp matching lead-out connection end and the frame gate clamp matching terminal;

[0018] The gate lead-out connection terminal and the gate clamp matching lead-out connection terminal are located in the same plane.

[0019] The gate-controlled device includes an IGBT type device or a MOSFET type device, wherein:

[0020] When the gate-controlled device is an IGBT type device, the gate clamping matching end is the emitter terminal of the gate-controlled device; when the gate-controlled device is a MOSFET type device, the gate clamping matching end is the source terminal of the gate-controlled device.

[0021] The single tube forms formed by plastic sealing the gate-controlled device with a single tube frame include TO247 single tube, TO3P single tube or TO220 single tube.

[0022] The shape of the clamping groove includes square or circle.

[0023] The frame body is provided with a frame body hole, and the side edges of the frame body are provided with body side edges, and the body side edges are symmetrically distributed on both sides of the frame column hole.

[0024] The advantages of the present invention are as follows: a clamping groove is arranged on the frame body of the single-tube frame, the clamping groove is used to accommodate the TVS unit, and the TVS unit is welded with the gate lead-out connection end and the gate clamp matching lead-out connection end to achieve adaptive electrical connection with the gate end of the gate-controlled device in the plastic-sealed single-tube frame and the gate clamp matching end of the gate-controlled device, that is, the gate voltage of the gate-controlled device sealed in the single-tube frame is clamped, the gate of the gate-controlled device can be effectively protected, the robustness of the single-tube structure is improved, and the single-tube structure can be protected from static electricity and overshoot voltage impact in other circuits;

[0025] After the gate-controlled device in the single-tube structure is gate-clamped by the TVS unit, the existing gate protection circuit can be omitted in the terminal circuit using the single-tube structure, thereby reducing the cost of the terminal circuit and meeting the needs of miniaturization; the TVS unit can be selected as a unidirectional TVS tube or a bidirectional TVS tube according to the actual application scenario, which is fully compatible with the current single-tube packaging process and does not increase the process cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the present invention.

[0027] Figure 2 It is a schematic diagram of the TVS unit of the present invention after being separated from the single-tube frame.

[0028] Figure 3 It is a schematic diagram of the gate lead-out connection terminal and the gate clamp matching lead-out connection terminal in the frame body of the present invention.

[0029] Figure 4 for Figure 3 main view.

[0030] Figure 5 It is a schematic diagram of the bidirectional self-clamping of the present invention.

[0031] Figure 6 It is a schematic diagram of the forward clamping of the present invention.

[0032] Figure 7 It is a schematic diagram of the directional clamping of the present invention.

[0033] Explanation of the accompanying drawings: 1-frame body, 2-frame body hole, 3-body side hole, 4-TVS unit, 5-clamping groove, 6-frame gate terminal, 7-frame device third terminal, 8-frame gate clamping matching terminal, 9-frame gate terminal reinforcement part, 10-frame device third terminal reinforcement part, 11-frame gate clamping matching terminal reinforcement part, 12-gate lead-out connection end, 13-gate clamping matching lead-out connection end, 14-gate terminal lead-out connector, 15-gate clamping matching lead-out connector. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0035] In order to clamp the gate of a single tube within a safe voltage range and protect it from static electricity or other overshoot voltages in the circuit; so that subsequent circuit design no longer needs to consider gate protection, thereby reducing subsequent design costs, the gate self-clamping single tube structure of the present invention specifically includes a single tube frame of a plastic-encapsulated gate-controlled device; and also includes a TSV unit 4 for gate self-clamping, wherein the TVS unit 4 is electrically connected to the gate end of the gate-controlled device in the plastic-encapsulated single tube frame and the gate clamping matching end of the gate-controlled device.

[0036] Specifically, for the gate-controlled device, a single-tube frame is used to plastic-encapsulate it into a single-tube structure. The form of the plastic-encapsulated single tube is consistent with the existing ones. For example, the single-tube form formed by plastic-encapsulating the gate-controlled device with a single-tube frame includes a TO247 single tube, a TO3P single tube or a TO220 single tube. The form of the plastic-encapsulated single tube can be selected according to needs to meet the actual application requirements.

[0037] In order to realize gate clamping, the TVS unit 4 is used for gate self-clamping. When the TVS unit 4 is used for gate self-clamping, the TVS unit 4 is electrically connected to the gate end of the gate-controlled device in the plastic-encapsulated single tube frame and the gate clamping matching end of the gate-controlled device.

[0038] Furthermore, the gate-controlled device includes an IGBT type device or a MOSFET type device, wherein:

[0039] When the gate-controlled device is an IGBT type device, the gate clamping matching end is the emitter terminal of the gate-controlled device; when the gate-controlled device is a MOSFET type device, the gate clamping matching end is the source terminal of the gate-controlled device.

[0040] In one embodiment of the present invention, the gate-controlled device may be an IGBT-type device or a MOSFET-type device, and the type of the gate-controlled device may be selected as required to meet the actual application requirements. When the type of the gate-controlled device is determined, the terminal of the gate clamping mating end may be determined accordingly; wherein, when the gate-controlled device is an IGBT-type device, the gate clamping mating end is the emitter terminal of the gate-controlled device; when the gate-controlled device is a MOSFET-type device, the gate clamping mating end is the source terminal of the gate-controlled device. When the gate-controlled device is of other types, the gate clamping mating end corresponds to the type of the gate-controlled device, which is well known to those skilled in the art and will not be described in detail here.

[0041] Furthermore, the TVS unit 4 includes a bidirectional TVS tube or a unidirectional TVS tube, wherein:

[0042] When the TVS unit 4 is a bidirectional TVS tube, bidirectional gate clamping is performed on the gate-controlled device with a single tube frame plastic package; when the TVS unit 4 is a unidirectional TVS tube, forward or reverse clamping is performed on the gate-controlled device with a single tube frame plastic package.

[0043] In an embodiment of the present invention, the TVS unit 4 may be a bidirectional TVS tube or a unidirectional TVS tube. The bidirectional TVS tube and the unidirectional TVS tube may specifically adopt existing commonly used forms so as to satisfy the gate clamping requirement.

[0044] Figure 5 The TVS unit 4 is an implementation case where a bidirectional TVS tube is used. Figure 5 In the embodiment, the gate-controlled device is an IGBT device. At this time, the gate terminal of the IGBT device IGBT1 and the emitter terminal of the IGBT device IGBT1 are adaptively connected to the bidirectional TVS tube TVS1.

[0045] Figure 6 This is an implementation in which the TVS unit 4 uses a unidirectional TVS tube. Figure 6 In the embodiment, the gate-controlled device is an IGBT device. At this time, the gate terminal of the IGBT device IGBT2 is connected to the anode terminal of the TVS tube TVS2, and the cathode terminal of the TVS tube TVS2 is connected to the emitter terminal of the IGBT device IGBT2, thereby realizing forward clamping.

[0046] Figure 7 FIG. 4 is another implementation of a unidirectional TVS tube used in TVS unit 4. Figure 7 In the embodiment, the gate-controlled device is an IGBT device. At this time, the gate terminal of the IGBT device IGBT3 is connected to the cathode terminal of the TVS tube TVS3, and the emitter terminal of the IGBT device IGBT3 is connected to the anode terminal of the TVS tube TVS3, thereby realizing reverse clamping.

[0047] like Figure 1As shown, the single-tube frame includes a frame body 1 and a device terminal group located on one side of the frame body 1, wherein:

[0048] A clamping groove 5 for allowing the TVS unit 4 to be embedded is provided on the frame body 1. After the TVS unit 4 is placed in the clamping groove 5, the TVS unit 4 is electrically connected to the gate end of the gate-controlled device and the gate clamping matching end of the gate-controlled device.

[0049] In one embodiment of the present invention, the single tube frame includes a frame body 1 and a device terminal group. Generally, the gate control device is located in the frame body 1. The frame body 1 is generally rectangular, such as Figure 1 , Figure 2 and Figure 3 In order to be compatible with the TVS unit 4, a clamping groove 5 is opened on one surface of the frame body 1, and the clamping groove 5 allows the TVS unit 4 to be embedded; in specific implementation, after the TVS unit 4 is placed in the clamping groove 5, the TVS unit 4 is electrically connected to the gate end of the gate-controlled device and the gate clamping matching end of the gate-controlled device.

[0050] The clamping groove 5 is generally adjacent to the device terminal group on the frame body 1. The size of the clamping groove 5 is slightly larger than the TVS unit 4. The shape of the TVS unit 4 is consistent with the shape of the clamping groove 5. When the TVS unit 4 is embedded in the clamping groove 5, there is a small gap between the edge of the TVS unit 4 and the inner circle edge of the clamping groove 5.

[0051] The shape of the clamping groove 5 includes square or circular; the shape of the clamping groove 5 can be selected as needed. Figure 1 and Figure 2 , the embodiment in which the clamping groove 5 is rectangular is shown. When the clamping groove 5 is rectangular, the TVS unit 4 is also rectangular.

[0052] In addition, a frame body hole 2 is provided on the frame body 1, and a body side hole 3 is provided on the side of the frame body 1, and the body side holes 3 are symmetrically distributed on both sides of the frame column hole 2. In one embodiment of the present invention, the frame column hole 2 passes through the frame body 1, and the frame column hole 2 and the device terminal group are respectively located on the corresponding two sides of the frame body 1.

[0053] Furthermore, a gate lead-out connection terminal 12 for leading out the gate control device and a gate clamp matching lead-out connection terminal 13 for leading out the gate clamp matching terminal of the gate control device are arranged in the clamping groove 5, and the gate lead-out connection terminal 12 and the gate clamp matching lead-out connection terminal 13 are exposed through the clamping groove 5;

[0054] The TVS unit 4 placed in the clamping groove 5 is respectively welded and electrically connected to the gate lead-out connection terminal 12 and the gate clamping matching lead-out connection terminal 13, so that the TVS unit 4 is electrically connected to the gate terminal of the gate-controlled device and the gate clamping matching terminal of the gate-controlled device.

[0055] In one embodiment of the present invention, a gate lead-out connection terminal 12 and a gate clamp matching lead-out connection terminal 13 are provided in the clamping groove 5. After the TVS unit 4 is placed in the clamping groove 5, the corresponding terminals of the TVS unit 4 are respectively welded and electrically connected to the gate lead-out connection terminal 12 and the gate clamp matching lead-out connection terminal 13, that is, after welding, the TVS unit 4 is adapted to be electrically connected to the gate terminal of the gate-controlled device and the gate clamp matching terminal of the gate-controlled device.

[0056] Further, the gate lead-out connection end 12 is electrically connected to the frame gate terminal 6 through the gate terminal lead-out connector 14, and the gate clamp matching lead-out connection end 13 is electrically connected to the frame gate clamp matching terminal 8 through the gate clamp matching lead-out connector 15, wherein,

[0057] The gate terminal lead-out connector 14 is perpendicular to the gate lead-out connection end 12 and the frame gate terminal 6, and the gate clamp matching lead-out connector 15 is perpendicular to the gate clamp matching lead-out connection end 13 and the frame gate clamp matching terminal 8;

[0058] The gate lead-out connection terminal 12 and the gate clamping matching lead-out connection terminal 13 are located in the same plane.

[0059] In one embodiment of the present invention, the gate lead-out connection terminal 12 is electrically connected to the frame gate terminal 6 through the gate terminal lead-out connector 14, and the gate clamp matching lead-out connection terminal 13 is electrically connected to the frame gate clamp matching terminal 8 through the gate clamp matching lead-out connector 15, so that after the TVS unit 4 is welded to the gate lead-out connection terminal 12 and the gate clamp matching lead-out connection terminal 13, an adaptive electrical connection with the gate terminal and the gate clamp matching terminal of the gate-controlled device can be achieved.

[0060] The frame body 1 has a space for accommodating the gate lead-out connection terminal 12, the gate clamp matching lead-out connection terminal 13, the gate terminal lead-out connector 14 and the gate clamp matching lead-out connector 15. The gate lead-out connection terminal 12 cooperates with the gate terminal lead-out connector 14 to form an L shape. Similarly, the gate clamp matching lead-out connection terminal 13 cooperates with the gate clamp matching lead-out connector 15 to form an L shape.

[0061] like Figure 1 , Figure 2 and Figure 3As shown, the device terminal group includes a frame gate terminal 6, a frame device third terminal 7 and a frame gate clamping matching terminal 8 arranged in sequence, wherein the frame gate terminal 6, the frame device third terminal 7 and the frame gate clamping matching terminal 8 are parallel to each other;

[0062] The gate lead-out connection terminal 12 is adapted to be electrically connected to the frame gate terminal 6 located inside the frame body 1, and the gate clamp matching lead-out connection terminal 13 is adapted to be electrically connected to the frame gate clamp matching terminal 8 located inside the frame body 1, and the gate lead-out connection terminal 12, the gate clamp matching lead-out connection terminal 13 and the third terminal 7 of the frame device are insulated and isolated from each other.

[0063] In one embodiment of the present invention, the use of the frame gate terminal 6, the frame device third terminal 7 and the frame gate clamp matching terminal 8 can facilitate the use and connection of the single-tube structure. The situation of the frame device third terminal 7 is related to the type of gate-controlled device. For example, when the gate-controlled device is an IGBT device, the gate-controlled device third terminal 7 is the collector terminal of the IGBT device; when the gate-controlled device is a MOSFET device, the gate-controlled device third terminal 7 is the drain terminal of the IGBT device.

[0064] The frame gate terminal 6, the frame device third terminal 7 and the frame gate clamping matching terminal 8 are on the same side of the frame body 1 and generally have the same length. In order to improve reliability, a frame gate terminal reinforcement portion 9 is provided at one end of the frame gate terminal 6 adjacent to the frame body 1, and the outer diameter of the frame gate terminal reinforcement portion 9 is greater than the outer diameter of the frame gate terminal 6. Similarly, a frame device third terminal reinforcement portion 10 and a frame gate clamping matching terminal reinforcement portion 11 are provided at one end of the frame device third terminal 7 and the frame gate clamping matching terminal 8 adjacent to the frame body 1, respectively.

[0065] In summary, a clamping groove 5 is provided on the frame body 1 of the single-tube frame, and the TVS unit 4 is accommodated in the clamping groove 5. The TVS unit 4 is welded with the gate lead-out connection terminal 12 and the gate clamp matching lead-out connection terminal 13 to achieve adaptive electrical connection with the gate terminal of the gate-controlled device in the plastic-sealed single-tube frame and the gate clamp matching terminal of the gate-controlled device, that is, the gate voltage of the gate-controlled device plastic-sealed in the single-tube frame is clamped, which can effectively protect the gate of the gate-controlled device, improve the robustness of the single-tube structure, and protect the single-tube structure from static electricity and overshoot voltage shocks in other circuits;

[0066] After the gate-controlled device in the single-tube structure is gate-clamped by the TVS unit 4, the existing gate protection circuit can be omitted in the terminal circuit using the single-tube structure, thereby reducing the cost of the terminal circuit and meeting the needs of miniaturization; the TVS unit 4 can be selected as a unidirectional TVS tube or a bidirectional TVS tube according to the actual application scenario, which is fully compatible with the current single-tube packaging process and does not increase the process cost.

Claims

1. A gate self-clamping single-tube structure, comprising a single-tube frame of a plastic-encapsulated gate-controlled device; wherein: It also includes a TVS unit (4) for gate self-clamping, the TVS unit (4) being electrically connected to the gate end of the gate-controlled device in the plastic-encapsulated single-tube frame and the gate clamping matching end of the gate-controlled device; The single-tube frame comprises a frame body (1) and a device terminal group located on one side of the frame body (1), wherein: A clamping groove (5) allowing the TVS unit (4) to be embedded is provided on the frame body (1); after the TVS unit (4) is placed in the clamping groove (5), the TVS unit (4) is electrically connected to the gate end of the gate-controlled device and the gate clamping matching end of the gate-controlled device; A gate lead-out connection terminal (12) for leading out the gate control device and a gate clamp matching lead-out connection terminal (13) for leading out the gate clamp matching terminal of the gate control device are arranged in the clamping groove (5), and the gate lead-out connection terminal (12) and the gate clamp matching lead-out connection terminal (13) are exposed through the clamping groove (5); The TVS unit (4) disposed in the clamping groove (5) is respectively welded and electrically connected to the gate lead-out connection terminal (12) and the gate clamping matching lead-out connection terminal (13), so that the TVS unit (4) is electrically connected to the gate terminal of the gate-controlled device and the gate clamping matching terminal of the gate-controlled device.

2. The gate self-clamping single-tube structure according to claim 1, characterized in that: The TVS unit (4) comprises a bidirectional TVS tube or a unidirectional TVS tube, wherein: When the TVS unit (4) is a bidirectional TVS tube, bidirectional gate clamping is performed on the gate-controlled device in the plastic package of the single tube frame; when the TVS unit (4) is a unidirectional TVS tube, forward or reverse clamping is performed on the gate-controlled device in the plastic package of the single tube frame.

3. The gate self-clamping single-tube structure according to claim 1, characterized in that: The device terminal group comprises a frame gate terminal (6), a frame device third terminal (7) and a frame gate clamping matching terminal (8) which are arranged in sequence, wherein the frame gate terminal (6), the frame device third terminal (7) and the frame gate clamping matching terminal (8) are parallel to each other; The gate lead-out connection terminal (12) is adapted to be electrically connected to a frame gate terminal (6) located in the frame body (1), the gate clamp matching lead-out connection terminal (13) is adapted to be electrically connected to a frame gate clamp matching terminal (8) located in the frame body (1), and the gate lead-out connection terminal (12), the gate clamp matching lead-out connection terminal (13) and the third terminal (7) of the frame device are insulated and isolated from each other.

4. The gate self-clamping single-tube structure according to claim 3, characterized in that: The gate lead-out connection terminal (12) is electrically connected to the frame gate terminal (6) via a gate terminal lead-out connector (14), and the gate clamp matching lead-out connection terminal (13) is electrically connected to the frame gate clamp matching terminal (8) via a gate clamp matching lead-out connector (15), wherein: The gate terminal lead-out connector (14) is perpendicular to the gate lead-out connection end (12) and the frame gate terminal (6), and the gate clamp matching lead-out connector (15) is perpendicular to the gate clamp matching lead-out connection end (13) and the frame gate clamp matching terminal (8); The gate lead-out connection terminal (12) and the gate clamp matching lead-out connection terminal (13) are located in the same plane.

5. The gate self-clamping single-tube structure according to any one of claims 1 to 4, characterized in that: The gate-controlled device includes an IGBT type device or a MOSFET type device, wherein: When the gate-controlled device is an IGBT type device, the gate clamping matching end is the emitter terminal of the gate-controlled device; when the gate-controlled device is a MOSFET type device, the gate clamping matching end is the source terminal of the gate-controlled device.

6. The gate self-clamping single-tube structure according to any one of claims 1 to 4, characterized in that: The single tube forms formed by plastic sealing the gate-controlled device with a single tube frame include TO247 single tube, TO3P single tube or TO220 single tube.

7. The gate self-clamping single-tube structure according to any one of claims 1 to 4, characterized in that: The shape of the clamping groove (5) includes square or circular.

8. The gate self-clamping single-tube structure according to any one of claims 1 to 4, characterized in that: A frame body hole (2) is provided on the frame body (1), and body side holes (3) are provided on the sides of the frame body (1), wherein the body side holes (3) are symmetrically distributed on both sides of the frame body hole (2).

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