WO2015194259A1 - 冷却器及び冷却器の固定方法 - Google Patents
冷却器及び冷却器の固定方法 Download PDFInfo
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- WO2015194259A1 WO2015194259A1 PCT/JP2015/062411 JP2015062411W WO2015194259A1 WO 2015194259 A1 WO2015194259 A1 WO 2015194259A1 JP 2015062411 W JP2015062411 W JP 2015062411W WO 2015194259 A1 WO2015194259 A1 WO 2015194259A1
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- cooler
- hole
- wall
- wall portion
- fixing
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Definitions
- the present invention relates to a cooler for cooling a semiconductor module.
- the cooler has a refrigerant flow path in a connection region for fixing the cooler to a substrate, has a high cooling efficiency, and is excellent in space saving. It relates to the fixing method.
- a power semiconductor element may be incorporated into a circuit board as a single unit, but a semiconductor module that combines multiple power semiconductor elements into a single package, or an intelligent power module that includes a control circuit, drive circuit, protection circuit, etc. Modules (IPM) are also used.
- a semiconductor module on which a plurality of power semiconductor elements are mounted has a large calorific value, and is preferably liquid-cooled in terms of cooling efficiency.
- additional devices such as a circulation pump and a secondary cooler are added, and the number of parts increases. Therefore, it is necessary to make each part as small as possible.
- downsizing of the semiconductor module and the cooler has become one of the highest priority issues.
- Optimizing the structure of the partition walls and cooling fins installed in the flow path for circulating the refrigerant is the most important for downsizing the cooler, but there are other assembly parts required for mounting the cooler on the base. The size reduction is important.
- Reference documents 1 to 4 disclose a fixing method in which a semiconductor module and a cooler are fastened and fixed with screws.
- JP-A-8-321570 Japanese Patent Laid-Open No. 9-22971 JP 2002-141450 A JP 2008-235725 A
- an object of the present invention is to provide a cooler that cools a semiconductor module and that also has a refrigerant flow path in a connection region for fixing the cooler to a base, has a high cooling efficiency, and is excellent in space saving.
- An object of the present invention is to provide a method for fixing the cooler.
- a cooler is a cooler that is fixed to a base body and cools a semiconductor module, wherein a first wall portion having a first through hole is disposed opposite to the first wall portion and the first wall portion is disposed.
- a cooler body having a flow path and a lid that closes the first through hole are provided.
- a second through hole is provided in the connection region of the second wall portion, and the second through hole is large enough to pass through the first through hole. It is preferable to provide a fixing member that is inserted to fix the cooler body to the base.
- an inner diameter of the second through hole on the refrigerant flow path side is wider than an inner diameter of the second through hole on the base side.
- the fixing member is a screw having a head portion and a screw portion, and the coolant passage side of the second through hole is a groove so that the head portion of the screw is accommodated. It is preferable that the head is disposed so as not to protrude into the refrigerant flow path.
- a seal member is provided between the second through hole and the fixing member.
- a wall portion having a wall thickness that is thinner than a wall thickness of another region is provided in the connection region of the second wall portion.
- a plurality of fins are connected to the refrigerant flow path side of the first wall portion so as not to block the first through hole.
- the lid is formed to be detachable from the first wall portion.
- the lid is installed so as not to protrude into the refrigerant flow path.
- the semiconductor module is fixed to the outside of the first wall portion, and the thickness of the first wall portion is thinner than the thickness of the second wall portion.
- the method for fixing a cooler is a fixing method for fixing a cooler that cools a semiconductor module to a base.
- a first wall portion having a first through hole, the first wall portion being disposed opposite to the first wall portion.
- Refrigerant flow surrounded by a second wall having a connection region connected to the base at a position facing the through hole, and a side wall connecting the periphery of the first wall and the periphery of the second wall
- a first step of preparing a cooler comprising a cooler body having a path and a lid for closing the first through hole; and a second step of positioning and contacting the outer side of the second wall portion to the base body Including a step, a third step of inserting a connection means through the first through-hole to fix the connection region to the base body, and a fourth step of closing the first through-hole with the lid.
- the cooler fixing method of the present invention in the first step, the cooler having a second through hole in the connection region of the second wall is used as the cooler, and the third step.
- the connecting means is a fixing member that is sized to pass through the first through-hole and is inserted into the second through-hole to fix the cooler body to the base.
- a fixing hole is provided in a portion where the region contacts, the fixing member is inserted into the cooler through the first through hole, and further inserted into the second through hole from the inside of the cooler, and the base body It is preferable to fix to the fixing hole.
- a welding tool is used as the connection means, the welding tool is inserted into the cooler through the first through hole, and the connection region Is preferably fixed to the base by welding.
- connection region for fixing the cooler to the base body is also provided with a refrigerant flow path, has a high cooling efficiency, and is excellent in space saving, and the cooling A method of fixing the vessel can be provided.
- the configuration of the semiconductor module is not particularly limited, but can be applied to, for example, a semiconductor module having an inverter circuit as described below.
- FIG. 1 shows an inverter circuit 1 that converts power from direct current to three-phase alternating current.
- an element pair 2 is constituted by one each of a semiconductor element (transistor) 11a and a semiconductor element (diode) 11b, and the element pair 2 is connected in series to constitute a half bridge 3, and the half bridge 3 Are connected in parallel.
- FIG. 2 (a) shows a schematic plan view of the semiconductor module 10 on which the inverter circuit 1 is mounted. That is, the semiconductor element (transistor) 11a and the semiconductor element (diode) 11b are mounted on the substrate 12 one by one and electrically connected by a conductor wire (not shown), and the element shown in FIG. Pair 2 can be configured.
- the semiconductor module 10 a total of six substrates 12 are mounted in two rows and three columns, and according to the circuit diagram shown in FIG. 1, the inverter circuit 1 can be configured by being electrically connected by conductor wires.
- the semiconductor module 10 may be equipped with a control integrated circuit 13 having gate drive control of the semiconductor element (transistor) 11a and / or circuit protection functions (short circuit, overcurrent, control power supply voltage drop, overheat). it can.
- the power semiconductor module including the control integrated circuit 13 is called IPM (Intelligent Power Module).
- the semiconductor module 10 can be mounted with a passive element 14 such as a capacitor, a resistor, and / or a thermistor as necessary for noise suppression and temperature measurement.
- a passive element 14 such as a capacitor, a resistor, and / or a thermistor as necessary for noise suppression and temperature measurement.
- FIG. 2B is a schematic cross-sectional view of the semiconductor module 10.
- Conductive layers 12b and 12c are formed on the front surface and the back surface of the insulating substrate 12a to constitute the substrate 12.
- the insulating substrate 12a is preferably a ceramic substrate such as aluminum nitride or aluminum oxide that has excellent thermal conductivity.
- the conductor layers 12b and 12c can be formed of a metal such as copper.
- the semiconductor element (transistor) 11 a and the semiconductor element (diode) 11 b can be bonded to the conductor layer 12 b via the solder layer 15.
- the substrate 12 can directly bond the conductor layer 12c on the back surface thereof to the cooler 20 via the solder layer 16.
- the substrate 12 has a conductor layer 12c on its back surface joined to a base plate 17 such as copper or nickel plated aluminum via the solder layer 16, and this base. Thermal grease can be applied to the back surface of the plate 17 and pressed against the cooler 20.
- the semiconductor module 10 includes a semiconductor element (transistor) 11a, a semiconductor element (diode) 11b, a control integrated circuit 13, a passive element 14 and a substrate 12 wired with conductor wires, and then thermosetting containing silicone gel or glass filler. It can be filled with a functional resin and sealed.
- the cooler of the present invention can be used not only for cooling the semiconductor module as described above but also for cooling a large-scale integrated circuit, a discrete semiconductor, or a passive element, a chip resistor, and a chip inductor composed of one chip.
- an IGBT Insulated Gate Bipolar Transistor
- SiC-MOSFET SiC-MOSFET having a low on-resistance and a high switching speed
- the semiconductor element (diode) 11b a SiC diode having a low on-resistance and a high withstand voltage can be used.
- a power MOSFET having a conventional structure formed on a Si substrate has a higher on-resistance and lower performance than an IGBT or SiC-MOSFET, but has a built-in body diode.
- the semiconductor element (diode) 11b becomes unnecessary. Therefore, the inverter circuit can be integrated on one chip and used for low power applications.
- the present invention relates to a cooler 20 used for cooling the semiconductor module 10 as described above and a fixing method thereof. That is, as shown in FIG. 3B, the cooler 20 in which the semiconductor module 10 is installed is used by being fixed to some base body 30.
- the cooler 20 has a through hole formed in a portion other than the refrigerant flow path, and the cooler 20 is attached to the base 30 by screws such as bolts inserted through the through hole. It was fixed.
- the present invention has been made to solve such problems.
- FIG. 3A is a schematic plan view of the cooler 20 according to the first embodiment of the present invention
- FIG. 3B is a schematic cross-sectional view taken along the line A-A ′ thereof.
- the cooler 20 of the present invention includes a wall portion 21, cooling fins 22, a refrigerant introduction port 23, and a refrigerant discharge port 24.
- the wall portion 21 is joined to the semiconductor module 10 and has a first through hole 26.
- a first wall portion 21a, a second wall portion 21b provided with a connection region 27 connected to the base body 30 at a position facing the first wall portion 21a and facing the first through hole 26, and the first wall portion 21a. It consists of a side wall part 21c that connects the periphery and the periphery of the second wall part 21b, and the second wall part 21b includes a second through hole 28 in the connection region 27.
- a refrigerant introduction flow path 25a, a cooling flow path 25b, and a refrigerant discharge flow path 25c are formed in a space surrounded by the first wall portion 21a, the second wall portion 21b, and the side wall portion 21c. In the present invention, all these channels are collectively referred to as a refrigerant channel.
- the cooling fins 22 are connected to the first wall portion 21a.
- a pin fin, a blade fin, or a corrugated fin can be used.
- a pin of the pin fin a cylindrical or quadrangular prism pin can be used, and a square arrangement or a staggered arrangement can be used.
- Blade fins and corrugated fins may have a straight shape so as to form a straight flow path, but a waving fin that undulates the fins so that the flow path meanders, and the fin is divided in the longitudinal direction and offset in the lateral direction. You may make it an offset fin arranged and attached.
- the wall 21 and the cooling fin 22 are preferably formed using a metal material having high thermal conductivity, for example, aluminum, aluminum alloy, copper, copper alloy, etc. More preferably, it is integrally formed by welding or casting.
- the refrigerant inlet 23 and the refrigerant outlet 24 are arranged on the diagonal line of the wall 21 of the cooler. Moreover, the 1st through-hole 26 and the 2nd through-hole 28 are arrange
- the refrigerant flows into the refrigerant introduction flow path 25 a from the refrigerant introduction port 23, flows dispersedly in the plurality of cooling flow paths 25 b formed between the cooling fins 22, and the refrigerant discharge flow Collected in the passage 25c and discharged from the refrigerant outlet 24.
- the first wall 21a and the cooling fins 22 are cooled by the refrigerant, and the semiconductor module 10 is cooled by the cooled first wall 21a.
- FIG. 4A shows a state before the cooler 20 is fixed.
- FIG. 2B shows a state in which the cooler 20 is being fixed.
- FIG. 2C shows a state after the fixing operation of the cooler 20.
- the base body 30 is provided with a fixing hole 31 for fixing the cooler 20.
- the inner diameter of the first through hole 26 is set to a size that allows the fixing member 40 and the seal member 41 to pass therethrough, and the cooling fins 22 are arranged so as not to close the first through hole 26 so that the fixing member 40 and the seal member 41 are sealed. The passage of the member 41 is not hindered.
- the inner diameter of the second through hole 28 on the refrigerant introduction flow path 25a and the refrigerant discharge flow path 25c side is made wider than the inner diameter of the second through hole 28 on the base body 30 side.
- a portion where the inner diameter of the second through hole 28 is widened constitutes a “groove” in the present invention.
- the fixing member 40 is preferably a screw composed of a head portion and a screw portion.
- the fixing hole 31 is a screw hole into which the screw is screwed.
- the groove is provided on the refrigerant flow path side of the second through hole 28 so that the head of the fixing member 40 and the seal member 41 are accommodated, and the head of the fixing member 40 does not protrude into the refrigerant flow path. Has been.
- the shape of the screw is not particularly limited, but the head is preferably flat, such as a low head screw, a flat screw, a pan head screw, and a flat head screw, and a low head screw and a flat screw are more preferable.
- the seal member 41 is not particularly limited, and an O-ring, a rubber gasket, a PTFE punched gasket, a seal tape, or a liquid seal material can be used.
- the process of preparing the cooler 20 as described above is the first process in the present invention.
- the cooler 20 is positioned on the base body 30 and the outside of the second wall portion 21b is brought into contact with the base body 30. .
- This step is the second step in the present invention.
- the fixing member 40 and the seal member 41 are inserted from the first through hole 26, and the fixing member 40 is inserted into the second through hole 28 from the inside of the cooler 20 through the seal member 41 to fix the base body 30. Insert into the service hole 31 and fix.
- the fixing member 40 is a screw
- the fixing member 40 can be fixed by being screwed into the fixing hole 31 and tightened.
- the second through hole 28 is hermetically sealed by a seal member 41 sandwiched between the head of the fixing member 40 and the second wall portion 21b.
- the first through hole 26 can be hermetically closed by inserting and fixing the lid 50 to the first through hole 26 via the seal member 51.
- This step is the fourth step in the present invention.
- the lid 50 is preferably installed so as not to protrude into the refrigerant flow path. Moreover, it is preferable that the lid
- the screw which consists of a head and a screw part can be used. In that case, a screw groove into which the screw portion of the lid 50 is screwed is formed on the inner periphery of the first through hole 26.
- the refrigerant introduction flow path 25a and the refrigerant discharge flow path 25c are secured between the lid 50 that closes the first through hole 26 and the fixing member 40 that is inserted into the second through hole 28, thereby forming a connection region. Since the refrigerant flow path can be formed also in the first through hole 26 and the second through hole 28, the cooler 20 can be made compact, and the refrigerant introduction flow path 25a and the refrigerant discharge flow path 25c are straightened, The flow can be improved.
- FIG. 5A is a schematic plan view of a cooler 20a according to the second embodiment of the present invention
- FIG. 5B is a schematic cross-sectional view taken along the line A-A ′.
- the cooler 20 a includes a wall portion 21, a cooling fin 22, a refrigerant introduction port 23, and a refrigerant discharge port 24, and the wall portion 21 is joined to the semiconductor module 10 and has a first through hole 26.
- 21a a second wall portion 21b that is disposed opposite to the first wall portion 21a and includes a connection region 27 that is connected to the base body 30 at a position facing the first through hole 26, and the first wall portion 21a. It consists of a side wall portion 21c that connects the periphery and the periphery of the second wall portion 21b.
- a recess is formed from the inside of the cooler 20 in the connection region 27 to reduce the thickness of the second wall portion 21b.
- the cooler 20a is the same as the first embodiment of the present invention for the wall 21, the cooling fins 22, the refrigerant inlet 23, and the refrigerant outlet 24 except for the shape of the connection region 27. it can.
- FIG. 6A shows a state before the fixing operation of the cooler 20a.
- FIG. 2B shows a state during the fixing operation of the cooler 20a.
- FIG. 2C shows a state after the fixing operation of the cooler 20a.
- the base 30 in the connection region 32, may be formed with a depression on the surface opposite to the surface in contact with the cooler 20a to reduce the thickness.
- the inner diameter of the first through hole 26 is set to a size that allows the connection means 60 to pass therethrough, and the cooling fins 22 are arranged so as not to block the first through hole 26 so as not to prevent the passage of the connection means 60. be able to.
- the process of preparing such a cooler 20a is the first process in the present invention.
- a welding tool is used as the connection means 60.
- spot welding lap resistance welding
- laser welding with less damage to the base material of the cooler 20a is preferable.
- the cooler 20a is positioned and installed on the base body 30, and the outside of the second wall portion 21b is brought into contact with the base body 30.
- This step is the second step of the present invention.
- This step is the third step of the present invention.
- This step is the fourth step of the present invention.
- connection means 60 a brazing tool or the like can be used in addition to the welding tool.
- a brazing material is provided between the connection region 27 of the second wall portion 21 b and the connection region 32 of the base body 30.
- a portion excluding the cooling fins 22 is provided in the central portion of the refrigerant flow path, and the first through hole 26 and the second through hole 28 are also provided there.
- the central part of the coolant channel can also be fixed to the base body, it can be firmly fixed even if the size of the cooler is increased.
- the first through hole 26 and the second through hole 28 arranged at the four corners of the wall portion 21 of the cooler are reduced to two diagonal corners, and the guide wall 29 is formed in an empty place. It is arranged to control the flow of refrigerant and prevent the occurrence of hot spots.
- the refrigerant introduction port 23, the refrigerant discharge port 24, the first through-hole 26, and the second through-hole 28 are arranged on the center line of the wall portion 21 of the cooler, and guides are provided at four empty corners.
- a wall 29 is arranged.
- the refrigerant introduction port 23 and the refrigerant discharge port 24 are arranged on one side of the wall 21 of the cooler, and the refrigerant introduction flow path 25a and the refrigerant introduction flow are provided in order to equalize the flow rate.
- a guide wall 29 is disposed on the path 25c.
- the positions of the first through hole 26 and the second through hole 28 can be set relatively freely according to the design of the refrigerant flow path, and the cooling efficiency of the cooler can be improved. Can contribute.
- Inverter circuit 2 Element pair 3: Half bridge 10: Semiconductor module 11: Semiconductor element 11a: Semiconductor element (transistor) 11b: Semiconductor element (diode) 12: substrate 12a: insulating substrate 12b, 12c: conductor layer 13: control integrated circuit 14: passive element 15, 16: solder layer 17: base plates 20, 20a, 20b, 20c, 20d, 20e: cooler 21: wall Part 21a: First wall part 21b: Second wall part 21c: Side wall part 22: Cooling fin 23: Refrigerant inlet 24: Refrigerant outlet 25a: Refrigerant inlet channel 25b: Cooling channel 25c: Refrigerant outlet channel 26: First through holes 27, 32: Connection region 28: Second through hole 29: Guide wall 30: Base 31: Fixing hole 40: Fixing member 41, 51: Seal member 50: Lid 60: Connection means
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- Power Engineering (AREA)
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Abstract
Description
2:素子ペア
3:ハーフブリッジ
10:半導体モジュール
11: 半導体素子
11a:半導体素子(トランジスタ)
11b: 半導体素子(ダイオード)
12:基板
12a:絶縁基板
12b、12c:導体層
13:制御用集積回路
14:受動素子
15、16:半田層
17:ベース板
20、20a、20b、20c、20d、20e:冷却器
21:壁部
21a:第1壁部
21b:第2壁部
21c:側壁部
22:冷却フィン
23:冷媒導入口
24:冷媒排出口
25a:冷媒導入流路
25b:冷却流路
25c:冷媒排出流路
26:第1貫通孔
27、32:接続領域
28:第2貫通孔
29:ガイド壁
30:基体
31:固定用孔
40:固定部材
41、51:シール部材
50:蓋
60:接続手段
Claims (13)
- 基体に固定され半導体モジュールを冷却する冷却器において、
第1貫通孔を持った第1壁部、前記第1壁部と対向配置され前記第1貫通孔と対向する位置に前記基体と接続される接続領域を備える第2壁部、及び、前記第1壁部の周囲と前記第2壁部の周囲とを接続する側壁部で囲まれる冷媒流路を備えた冷却器本体と、
前記第1貫通孔を塞ぐ蓋と、
を備えることを特徴とする冷却器。 - 前記第2壁部の前記接続領域には、第2貫通孔が設けられ、
前記第1貫通孔を通過可能な大きさであって、前記第2貫通孔に挿入されて前記冷却器本体を前記基体に固定する、固定部材を備える請求項1記載の冷却器。 - 前記第2貫通孔の前記冷媒流路側の内径は、前記第2貫通孔の前記基体側の内径よりも広い請求項2に記載の冷却器。
- 前記固定部材が、頭部とネジ部からなるネジであり、
前記第2貫通孔の前記冷媒流路側は、前記ネジの前記頭部が収容されるように溝が設けられ、前記頭部が前記冷媒流路に突出しないように配置されている請求項3に記載の冷却器。 - 前記第2貫通孔と前記固定部材との間にシール部材を備える請求項2~4のいずれか1項に記載の冷却器。
- 前記第2壁部の前記接続領域には、肉厚が他の領域の肉厚よりも薄くなっている壁部が設けられている請求項1に記載の冷却器。
- 前記第1壁部の冷媒流路側には、前記第1貫通孔を閉塞しないように、複数のフィンが接続されている請求項1に記載の冷却器。
- 前記蓋は、前記第1壁部から着脱自在に形成されている請求項1に記載の冷却器。
- 前記蓋は、前記冷媒流路に突出しないように設置されている請求項1に記載の冷却器。
- 前記半導体モジュールが前記第1壁部の外側に固定され、
前記第1壁部の厚さは、前記第2壁部の厚さより薄い請求項1に記載の冷却器。 - 基体に半導体モジュールを冷却する冷却器を固定する固定方法において、
第1貫通孔を持った第1壁部、前記第1壁部と対向配置され前記第1貫通孔と対向する位置に前記基体と接続される接続領域を備える第2壁部、及び、前記第1壁部の周囲と前記第2壁部の周囲とを接続する側壁部で囲まれる冷媒流路を備えた冷却器本体と、前記第1貫通孔を塞ぐ蓋とを備える冷却器を用意する第1の工程と、
前記第2壁部の外側を前記基体に位置決めして接触させる第2の工程と、
前記第1貫通孔を通して接続手段を挿入して、前記接続領域を前記基体に固定する第3の工程と、
前記第1貫通孔を前記蓋で塞ぐ第4の工程とを含むことを特徴とする、冷却器の固定方法。 - 前記第1の工程において、前記冷却器として、前記第2壁部の前記接続領域に第2貫通孔を有するものを用い、
前記第3の工程において、前記接続手段として、前記第1貫通孔を通過可能な大きさであって前記第2貫通孔に挿入されて前記冷却器本体を前記基体に固定する固定部材を用い、前記基体の前記接続領域が接する部分には、固定用孔を設け、前記第1貫通孔を通して前記固定部材を前記冷却器内に挿入し、更に前記冷却器の内側から前記第2貫通孔に挿入して、前記基体の固定用孔に固定する請求項11記載の冷却器の固定方法。 - 前記第3の工程において、前記接続手段として溶接工具を用い、前記第1貫通孔を通して前記溶接工具を前記冷却器内に挿入し、前記接続領域を前記基体に溶接して固定する請求項11記載の冷却器の固定方法。
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US15/108,275 US10319665B2 (en) | 2014-06-19 | 2015-04-23 | Cooler and cooler fixing method |
JP2016529144A JP6315091B2 (ja) | 2014-06-19 | 2015-04-23 | 冷却器及び冷却器の固定方法 |
CN201580003586.XA CN105874592B (zh) | 2014-06-19 | 2015-04-23 | 冷却器及冷却器的固定方法 |
EP15810584.1A EP3076428B1 (en) | 2014-06-19 | 2015-04-23 | Cooler and cooler fixing method |
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EP (1) | EP3076428B1 (ja) |
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Also Published As
Publication number | Publication date |
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EP3076428A4 (en) | 2017-10-11 |
JPWO2015194259A1 (ja) | 2017-04-20 |
CN105874592B (zh) | 2019-07-23 |
US10319665B2 (en) | 2019-06-11 |
CN105874592A (zh) | 2016-08-17 |
JP6315091B2 (ja) | 2018-04-25 |
US20160307821A1 (en) | 2016-10-20 |
EP3076428A1 (en) | 2016-10-05 |
EP3076428B1 (en) | 2019-03-13 |
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