Double-unit IGBT power module

Abstract

The utility model provides a double-unit IGBT power module, which comprises a heat dissipation plate and conducting strips, the conducting strips comprise a main conducting strip welded with a chip and an auxiliary conducting strip electrically connected with the main conducting strip and a signal terminal, and the main conducting strip comprises a first main conducting strip and a second main conducting strip which are arranged along the front-back direction; the first main conductive sheet and the second main conductive sheet oppositely extend in a staggered mode to form a first auxiliary part and a second auxiliary part which are arranged in the left-right direction, the first auxiliary part extends outwards to form a T-shaped part, and one end of the T-shaped part extends to the right side of the second main conductive sheet and is electrically connected with an E electrode of the IGBT chip through a CLIP piece arranged in the left-right direction. The other end extends to the right side of the first main conductive sheet and is electrically connected with the signal terminal through a CLIP piece arranged in the left-right direction; and the auxiliary conductive sheets are respectively located at the left and right sides of the first main conductive sheet and the second main conductive sheet, respectively extend to the corresponding signal terminals and are electrically connected through CLIP pieces arranged in the left and right directions. The utility model has the advantages of simple layout, convenience in welding and positioning and difficulty in short circuit.

Description

Technical Field

[0001] The utility model relates to the field of semiconductors, in particular to a double-unit IGBT power module. Background Art

[0002] IGBT (Insulated Gate Bipolar Transistor), an insulated gate bipolar transistor, is a composite fully controlled voltage-driven power semiconductor device composed of a bipolar junction transistor (BJT) and an insulated gate field effect transistor (MOS). It has the advantages of high input impedance of a metal-oxide-semiconductor field-effect transistor (MOSFET) and low on-state voltage drop of a power transistor (Giant Transistor, GTR). GTR has a low saturation voltage drop and a large current density, but a large driving current; MOSFET has a very small driving power and a fast switching speed, but a large on-state voltage drop and a small current density. IGBT combines the advantages of the above two devices, with low driving power and low saturation voltage drop. It is very suitable for use in converter systems with a DC voltage of 600V and above, such as AC motors, inverters, switching power supplies, lighting circuits, traction drives, and other fields.

[0003] The IGBT module includes an IGBT chip and an FRD diode chip, and the IGBT power module generally welds the IGBT chip and the diode chip on a heat dissipation substrate with a circuit, and then electrically connects the chip electrodes and the corresponding conductive structures on the circuit through bonding wires or bridge components such as CLIP.

[0004] For example, referring to Chinese patent CN117650110A, an IGBT module packaging structure is disclosed, and in the IGBT module packaging structure, the bridge wire short-connected with the signal terminal is tilted, which is easy to cause unstable welding or short-circuit with other wires when crossing the wire. And because there are two DBC structures in this IGBT module packaging structure, a number of bonding wires need to be bridged between the two DBC structures, which not only has too many welding points, but also easily interferes with the arrangement of other bonding wires, so that many intermediate transition conductive sheets and bonding wires are added to the entire DBC structure.

[0005] Referring to Chinese patent CN116469878A, although CLIP parts are used instead of bonding wires, since the bridge parts cannot be made too long to prevent the bridge parts from deformation and bending, an IGBT module requires many bridge parts between the conductive plates to relay the signals, and some bridge parts need to be set at an angle. In order to reduce the volume of the IGBT module, the spacing between the conductive plates in the wiring structure is often very small, and the conductive plates at the signal transmission ends are often made very narrow. When welding the bridge parts, it is easy to cause a short circuit in the wiring on the IGBT due to unstable positioning, tilting of the bridge parts during welding, or outflow of solder paste.

[0006] Therefore, there is an urgent need for a dual-unit IGBT power module that can solve the above problems. Utility Model Content

[0007] The utility model aims to provide a double-unit IGBT power module, which has a simple layout of conductive sheets, is convenient for welding and positioning, and is not prone to short circuit due to tilting and misalignment.

[0008] In order to achieve the above-mentioned object, the utility model provides a dual-unit IGBT power module, comprising a housing, a heat sink installed in the housing, a conductive sheet laid on the heat sink, a chip welded on the conductive sheet, a CLIP piece welded on the conductive sheet and the chip, and signal terminals installed on the left and right sides of the housing and power terminals installed on the front and rear sides of the housing, the chip comprising an IGBT chip and a diode chip, the conductive sheet comprising a main conductive sheet welded with the chip, and a secondary conductive sheet electrically connecting the main conductive sheet and the signal terminal, the main conductive sheet comprising a first main conductive sheet and a second main conductive sheet; the first main conductive sheet and the second main conductive sheet are arranged side by side in the front-to-back direction, and the first main conductive sheet and The second main conductive sheets are staggered and extended relative to each other to form a first auxiliary portion and a second auxiliary portion arranged in the left and right directions, the first auxiliary portion is located on the right side of the second auxiliary portion and extends to the right to form a T-shaped portion; the rear end of the T-shaped portion extends to the right side of the second main conductive sheet and is electrically connected to the E pole on the IGBT chip on the second main conductive sheet, and the front end of the T-shaped portion extends to a position corresponding to a signal terminal on the right side of the first main conductive sheet and is electrically connected to the signal terminal through a CLIP component arranged in the left and right directions; the auxiliary conductive sheets are respectively located on the left and right sides of the first main conductive sheet and the second main conductive sheet and respectively extend to the corresponding signal terminals and are electrically connected to the signal terminals through a CLIP component arranged in the left and right directions.

[0009] Preferably, the auxiliary conductive sheet includes a first auxiliary conductive sheet, and a spacing area is provided between the second conductive strip and the first main conductive sheet. The rear half of the first auxiliary conductive sheet is installed in the spacing area, and the front half is installed on the right side of the first main conductive sheet. The rear end of the first auxiliary conductive sheet is opposite to the front end of the second auxiliary portion and is electrically connected through a CLIP component arranged along the left and right directions, and the front end is opposite to a signal terminal and is electrically connected to the signal terminal through a CLIP component arranged along the left and right directions.

[0010] Preferably, the auxiliary conductive sheet includes a second auxiliary conductive sheet, which is located on the right side of the T-shaped portion, and the rear end of the second auxiliary conductive sheet extends to the corresponding position of the G pole of the IGBT chip on the second main conductive sheet and is electrically connected to it through a CLIP piece arranged in the left and right directions, and the front end of the second auxiliary conductive sheet extends to the corresponding position of one of the signal terminals and is electrically connected to it through a CLIP piece arranged in the left and right directions.

[0011] Preferably, the auxiliary conductive sheet includes a third auxiliary conductive sheet, and the third auxiliary conductive sheet includes a first part located on the left side of the first main conductive sheet and the second main conductive sheet and a second part extending from the first part to the rear side of the second main conductive sheet, the first part is electrically connected to the E pole on the IGBT chip on the first main conductive sheet through a CLIP piece arranged in the left and right directions, and the second part extends to the front side of a power terminal and is electrically connected to the power terminal through the CLIP pieces arranged in the front and rear directions.

[0012] Specifically, the auxiliary conductive sheet includes a fourth auxiliary conductive sheet, the left side of the third auxiliary conductive sheet has a notch, the fourth auxiliary conductive sheet is installed in the notch, and the front end of the fourth auxiliary conductive sheet extends to the G pole corresponding position of the IGBT chip on the first main conductive sheet and is electrically connected to it through CLIP parts arranged in the left and right directions.

[0013] Preferably, the first main conductive sheet and the second main conductive sheet are respectively provided with two groups of chips, the chips in the first group include a diode chip, an IGBT chip and a diode chip arranged in the left-right direction, the chips in the first group include an IGBT chip, a diode chip and an IGBT chip arranged in sequence in the left-right direction, the G pole of the IGBT chip of the first group of chips is offset and opposite to the G poles of the two IGBT chips in the second group of chips, the CLIP component includes a G pole CLIP component, the G pole CLIP component includes a first welding portion welded to the auxiliary conductive sheet, a first connecting sheet extending upward from the first welding portion and then extending toward the IGBT chip in the left-right direction, and three G pole welding feet extending downward from corresponding positions of the front and rear edges of the first connecting sheet to the G pole of the IGBT chip, the three G pole welding feet being arranged in a triangle to support the G pole CLIP component.

[0014] Specifically, the first connecting piece is a straight piece.

[0015] Specifically, the CLIP component includes a main CLIP component, which includes a second welding portion welded to the auxiliary conductive sheet, a main welding sheet extending along the left-right direction toward the E pole of the IGBT chip and the positive electrode of the diode chip, and an arched connecting portion connecting the second welding portion and the main welding sheet, and the main welding sheet is formed with welding areas welded to the E pole of the IGBT chip and the positive electrode of the diode chip, respectively.

[0016] Preferably, the dual-unit IGBT power module also includes two detection conductive plates arranged at intervals in the corners of the heat sink, a thermistor welded on the detection conductive plates, and a temperature detection terminal installed on the left or right side of the shell and corresponding to the positions of the two detection conductive plates, and the two detection conductive plates and the two temperature detection terminals are electrically connected through CLIP parts arranged on the left and right.

[0017] Preferably, the power terminal is electrically connected to the conductive sheet via a CLIP piece arranged in the front-to-back direction.

[0018] In the utility model, the first main conductive sheet cooperates with the corresponding auxiliary conductive sheet to form a first IGBT unit, and the second main conductive sheet cooperates with the corresponding auxiliary conductive sheet to form a second IGBT unit. Compared with the prior art, the two IGBT units are connected together by arranging two staggered auxiliary parts and a T-shaped part between the first main conductive sheet and the second main conductive sheet, without the need to separately arrange a number of connecting gold wires. The structure is simple, stable, and convenient for wiring. Moreover, all CLIP parts connecting the signal terminals are arranged in the left and right directions, which is convenient for welding positioning and is not easy to be short-circuited due to tilting and misalignment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the double-unit IGBT power module of the utility model.

[0020] Figure 2 It is an exploded view of the double-unit IGBT power module of the utility model.

[0021] Figure 3 It is a partial stereogram of the double-unit IGBT power module of the utility model.

[0022] Figure 4 yes Figure 3 It is a top view.

[0023] Figure 5 It is a structural diagram of the DBC board of the utility model.

[0024] Figure 6It is a structural diagram of the G-pole CLIP component of the utility model.

[0025] Figure 7 It is a structural diagram of the main CLIP component of the utility model. DETAILED DESCRIPTION

[0026] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0027] refer to Figure 1 and Figure 2 The utility model provides a dual-unit IGBT power module 100, including a housing 10, a DBC board installed in the housing, a chip and a CLIP piece welded on the DBC board, and signal terminals 41 installed on the left and right sides of the housing 10 and power terminals 42 installed on the front and rear sides of the housing 10. The DBC board includes a heat sink 11 installed in the housing 10, a conductive sheet laid on the heat sink 11, the chip is welded on the conductive sheet, and the CLIP piece is welded on the conductive sheet and the chip.

[0028] refer to Figure 2 and Figure 3 , the chip includes an IGBT chip 201 and a diode chip 202, the conductive sheet includes a main conductive sheet with a chip welded thereto and a secondary conductive sheet electrically connecting the main conductive sheet and the signal terminal 41. The main conductive sheet includes a first main conductive sheet 21 and a second main conductive sheet 22. The secondary conductive sheet includes a first secondary conductive sheet 31, a second secondary conductive sheet 32, a third secondary conductive sheet 33, and a fourth secondary conductive sheet 34. The CLIP component includes a main CLIP component 51, a G-pole CLIP component 52, a secondary CLIP component 53, and a power CLIP component 54.

[0029] The auxiliary conductive sheets are respectively located on the left and right sides of the first main conductive sheet 21 and the second main conductive sheet 22 and extend to the left and right sides of the corresponding signal terminals 41 to be electrically connected through the auxiliary CLIP components 53 arranged in the left and right directions. The power terminals 42 are electrically connected to the conductive sheets through the power CLIP components 54 arranged in the front and rear directions.

[0030] refer to Figures 3 to 5 The first main conductive plate 21 and the second main conductive plate 22 respectively have two groups of chips, the first group of chips includes a diode chip 202, an IGBT chip 201 and a diode chip 202 arranged in the left-right direction, and the first group of chips includes an IGBT chip 201, a diode chip 202 and an IGBT chip 201 arranged in sequence in the left-right direction.

[0031] refer to Figures 3 to 5The first main conductive sheet 21 and the second main conductive sheet 22 are arranged side by side in a front-to-back direction, and the first main conductive sheet 21 and the second main conductive sheet 22 extend oppositely from the left and right directions to form a first auxiliary portion 23 and a second auxiliary portion 24, respectively. The first auxiliary portion 23 extends outward in the left and right directions to form a T-shaped portion 25.

[0032] refer to Figure 4 and Figure 5 The T-shaped portion 25 includes a first conductive strip 251 extending to the right side of the second main conductive strip 22 and a second conductive strip 252 extending to the right side of the first main conductive strip 21. The first conductive strip 251 is electrically connected to the E pole of the IGBT chip 201 on the second main conductive strip 22 through a CLIP piece 55 arranged in the left and right directions. The end of the second conductive strip 252 extends to the left side of the first signal terminal 41 and is electrically connected to the first signal terminal 41 through a sub-CLP piece 53 arranged in the left and right directions.

[0033] refer to Figure 3 , Figure 4 , Figure 5 and Figure 7 The main CLIP part 51 includes a first conductive strip 251 welded to the T-shaped portion 25, a second welding portion 511 on the third secondary conductive piece 33, a main welding piece 512 extending in the left-right direction toward the E pole of the IGBT chip 201 and the positive electrode of the diode chip 202, and an arched connecting portion 513 connecting the second welding portion 511 and the main welding piece 512. Three welding areas 513 are formed on the main welding piece 512, which are respectively welded to the E pole of the IGBT chip and the positive electrode of the diode chip.

[0034] refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 , the G pole of the IGBT chip 201 of the first group of chips is offset and opposite to the G pole of the two IGBT chips 201 of the second group of chips, referring to Figure 6 The G-pole CLIP component 52 includes a first welding portion 521 welded to the second auxiliary conductive sheet 32 ​​and the fourth auxiliary conductive sheet 34, a first connecting piece 522 extending upward from the first welding portion 521 and then extending in the left-right direction toward the IGBT chip 201, and three G-pole welding legs 523 extending downward from corresponding positions of the front and rear edges of the first connecting piece 522 to the G-pole of the IGBT chip 201. The three G-pole welding legs 523 are arranged in a triangular shape to support the G-pole CLIP component 52. Specifically, the first connecting piece 522 is a straight piece.

[0035] refer to Figure 4 and Figure 5, there is a spacer between the second conductive strip 252 and the first main conductive sheet 21. The rear half of the first auxiliary conductive sheet 31 is installed in the spacer, and the front half is installed on the right side of the first main conductive sheet 21. The rear end of the first auxiliary conductive sheet 31 is opposite to the front end of the second auxiliary portion 24 and is electrically connected through the auxiliary CLIP piece 53 arranged in the left-right direction, and the front end is opposite to the second signal terminal 41 and is electrically connected through the auxiliary CLIP piece 53 arranged in the left-right direction. The second signal terminal 41 is located in front of the first signal terminal 41.

[0036] refer to Figure 4 and Figure 5 The second auxiliary conductive sheet 32 ​​includes a portion located on the right side of the T-shaped portion 25, and the rear end of the second auxiliary conductive sheet 32 ​​extends to a position corresponding to the G pole of the IGBT chip 201 on the second main conductive sheet 22 and is electrically connected to the G pole through an auxiliary CLIP piece 53 arranged in the left and right directions. The front end of the second auxiliary conductive sheet 32 ​​extends to a position corresponding to the third signal terminal 41 and is electrically connected to the G pole through an auxiliary CLIP piece 53 arranged in the left and right directions. The third signal terminal 41 is located on the rear side of the first signal terminal 41.

[0037] refer to Figure 4 and Figure 5 The third auxiliary conductive sheet 33 includes a first portion 331 located on the left side of the first main conductive sheet 21 and the second main conductive sheet 22 and a second portion 332 extending from the first portion 331 to the rear side of the second main conductive sheet 22. The first portion 331 is electrically connected to the E pole of the IGBT chip 201 on the first main conductive sheet 21 through an auxiliary CLIP piece 53 arranged in the left and right directions. The second portion 332 extends to the front side of a power terminal 42 and is electrically connected to the power terminal 42 through a power CLIP piece 54 arranged in the front and rear directions.

[0038] refer to Figure 4 and Figure 5 The third auxiliary conductive sheet 33 has a notch on the left side, and the fourth auxiliary conductive sheet 34 is installed in the notch. The front end of the fourth auxiliary conductive sheet 34 extends to the position corresponding to the G pole of the IGBT chip 201 on the first main conductive sheet 21 and is electrically connected to it through the auxiliary CLIP parts 53 arranged in the left and right directions.

[0039] refer to Figure 3 and Figure 4The dual-unit IGBT power module 100 also includes two detection conductive sheets 61 arranged at intervals in the corners of the heat sink, a thermistor 62 welded on the detection conductive sheet 61, and a temperature detection terminal 64 installed on the left or right side of the housing 10 and corresponding to the positions of the two detection conductive sheets. The two detection conductive sheets 61 and the two temperature detection terminals 64 are electrically connected through CLIP parts 63 arranged on the left and right sides.

[0040] The front, back, left, and right in the present invention are relative positions rather than absolute positions.

[0041] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A dual-unit IGBT power module, comprising a housing, a heat sink installed in the housing, a conductive sheet laid on the heat sink, a chip welded on the conductive sheet, a CLIP piece welded on the conductive sheet and the chip, and signal terminals installed on the left and right sides of the housing and power terminals installed on the front and rear sides of the housing, wherein the chip comprises an IGBT chip and a diode chip, and is characterized in that: The conductive sheet comprises a main conductive sheet welded with a chip, and a secondary conductive sheet electrically connecting the main conductive sheet and the signal terminal, and the main conductive sheet comprises a first main conductive sheet and a second main conductive sheet; The first main conductive sheet and the second main conductive sheet are arranged side by side in the front-to-back direction, and the first main conductive sheet and the second main conductive sheet are staggered and extended relative to each other to form a first auxiliary portion and a second auxiliary portion arranged in the left-right direction, and the first auxiliary portion is located on the right side of the second auxiliary portion and extends rightward to form a T-shaped portion; The rear end of the T-shaped portion extends to the right side of the second main conductive sheet and is electrically connected to the E pole of the IGBT chip on the second main conductive sheet, and the front end of the T-shaped portion extends to the right side of the first main conductive sheet and a position corresponding to the signal terminal and is electrically connected to the signal terminal through a CLIP member arranged in the left and right directions; The auxiliary conductive sheets are respectively located at the left and right sides of the first main conductive sheet and the second main conductive sheet and are respectively extended to the corresponding signal terminals and then electrically connected to the signal terminals through CLIP components arranged in left and right directions.

2. The dual-unit IGBT power module according to claim 1, characterized in that: The T-shaped portion includes a first conductive strip extending to the right side of the second main conductive strip and a second conductive strip extending to the right side of the first main conductive strip. The auxiliary conductive strip includes a first auxiliary conductive strip. A spacing area is provided between the second conductive strip and the first main conductive strip. The rear half of the first auxiliary conductive strip is installed in the spacing area, and the front half is installed on the right side of the first main conductive strip. The rear end of the first auxiliary conductive strip is opposite to the front end of the second auxiliary portion and is electrically connected to the first auxiliary portion through a CLIP component arranged in the left-right direction, and the front end is opposite to the signal terminal and is electrically connected to the signal terminal through a CLIP component arranged in the left-right direction.

3. The dual-unit IGBT power module according to claim 1, characterized in that: The auxiliary conductive sheet includes a second auxiliary conductive sheet, the second auxiliary conductive sheet is located on the right side of the T-shaped portion, and the rear end of the second auxiliary conductive sheet extends to the corresponding position of the G pole of the IGBT chip on the second main conductive sheet and is electrically connected to the G pole of the IGBT chip through a CLIP component arranged in the left and right directions, and the front end of the second auxiliary conductive sheet extends to the corresponding position of one of the signal terminals and is electrically connected to the G pole of the IGBT chip through a CLIP component arranged in the left and right directions.

4. The dual-unit IGBT power module according to claim 1, characterized in that: The auxiliary conductive sheet includes a third auxiliary conductive sheet, and the third auxiliary conductive sheet includes a first portion located on the left side of the first main conductive sheet and the second main conductive sheet and a second portion extending from the first portion to the rear side of the second main conductive sheet, the first portion is electrically connected to the E pole on the IGBT chip on the first main conductive sheet through a CLIP component arranged in the left and right directions, and the second portion extends to the front side of one of the power terminals and is electrically connected to the power terminal through the CLIP components arranged in the front and rear directions.

5. The dual-unit IGBT power module according to claim 4, characterized in that: The auxiliary conductive sheet also includes a fourth auxiliary conductive sheet. The left side of the third auxiliary conductive sheet has a notch. The fourth auxiliary conductive sheet is installed in the notch. The front end of the fourth auxiliary conductive sheet extends to the position corresponding to the G pole of the IGBT chip on the first main conductive sheet and is electrically connected to the IGBT chip through CLIP parts arranged in the left and right directions.

6. The dual-unit IGBT power module according to claim 1, characterized in that: The first main conductive sheet and the second main conductive sheet are respectively provided with two groups of chips, the first group of chips includes a diode chip, an IGBT chip and a diode chip arranged in the left-right direction, the first group of chips includes an IGBT chip, a diode chip and an IGBT chip arranged in sequence in the left-right direction, the G pole of the IGBT chip of the first group of chips is offset and opposite to the G poles of the two IGBT chips in the second group of chips, the CLIP component includes a G pole CLIP component, the G pole CLIP component includes a first welding portion welded to the conductive sheet, a first connecting sheet extending upward from the first welding portion and then extending toward the IGBT chip in the left-right direction, and three G pole welding feet extending downward from corresponding positions of the front and rear edges of the first connecting sheet to the G pole of the IGBT chip, the three G pole welding feet being arranged in a triangle to support the G pole CLIP component.

7. The dual-unit IGBT power module according to claim 6, characterized in that: The first connecting piece is a straight piece.

8. The dual-unit IGBT power module according to claim 6, characterized in that: The CLIP component includes a main CLIP component, which includes a second welding portion welded to a conductive sheet, a main welding sheet extending in a left-right direction toward an E pole of an IGBT chip and a positive electrode of a diode chip, and an arched connecting portion connecting the second welding portion and the main welding sheet, wherein welding areas are formed on the main welding sheet and are welded to the E pole of the IGBT chip and the positive electrode of the diode chip, respectively.

9. The dual-unit IGBT power module according to claim 1, characterized in that: It also includes two detection conductive sheets arranged at intervals in the corners of the heat sink, a thermistor welded on the detection conductive sheets, and a temperature detection terminal installed on the left or right side of the shell and corresponding to the positions of the two detection conductive sheets. The two detection conductive sheets and the two temperature detection terminals are electrically connected through CLIP parts arranged on the left and right sides.

10. The dual-unit IGBT power module according to claim 1, characterized in that: The power terminal is electrically connected to the conductive sheet through a CLIP piece arranged in a front-to-back direction.

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