WO2015046040A1 - かしめヒートシンクおよびヒートシンク一体型パワーモジュール - Google Patents
かしめヒートシンクおよびヒートシンク一体型パワーモジュール Download PDFInfo
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- WO2015046040A1 WO2015046040A1 PCT/JP2014/074809 JP2014074809W WO2015046040A1 WO 2015046040 A1 WO2015046040 A1 WO 2015046040A1 JP 2014074809 W JP2014074809 W JP 2014074809W WO 2015046040 A1 WO2015046040 A1 WO 2015046040A1
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- Prior art keywords
- fin
- heat sink
- panel
- caulking
- outer peripheral
- Prior art date
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Definitions
- the present invention relates to a caulking heat sink, and more particularly, to a caulking heat sink structure used by being integrated with a power module.
- a heat sink having a caulking structure is widely adopted as a heat sink in electronic devices having power semiconductor elements (heat generating portions) such as LSI (Large Scale Integration) and diodes (for example, Patent Documents 1, 4, and 5).
- the heat sink having the caulking structure dissipates heat generated from the heat generating portion by heat conduction (or heat transfer).
- a heat sink having a caulking structure a plurality of fins are inserted into fin insertion grooves formed on the plane of the fin base.
- the fin base is plastically deformed by caulking the caulking portion of the fin base, and the fin base and the plurality of fins are integrated.
- the heat sink integrated power module there is known a fin integrated power module in which a corrugated heat sink is integrated by being embedded in the unevenness of the base of the bottom surface of the resin-encapsulated power module (for example, Patent Document 2). Radiation noise emitted from the heat sink can be suppressed by connecting the radiating fin to the ground potential (for example, Patent Document 3).
- the fin base and the fin which are separate members, are integrated by caulking.
- One characteristic of the caulking heat sink is that the fin length is longer than the fin base length in the air path direction.
- screw holes are machined on the fin base side of the caulking heat sink. This processing increases the cost of the power module and increases the size of the fin base in order to secure the screw hole manufacturing position. Screw holes machined in the grease surface of the fin base deteriorate the heat dissipation performance of the heat sink.
- An object of the present invention is to produce a caulking heat sink that can secure an air passage to obtain a sufficient heat radiation performance and that can be easily fixed to a heat generating portion, and a heat sink integrated power module including the caulking heat sink.
- the caulking heat sink according to the present invention includes a fin base having a first fin insertion groove and a second fin insertion groove having an outer peripheral portion and sandwiching the bifurcated caulking portion, and the first fin insertion of the fin base.
- the caulking heat sink can secure the air passage by obtaining the caulking heat sink by sandwiching the panel between the fin bases, so that sufficient heat radiation performance can be obtained. Furthermore, since the panel and the fin base are integrated by caulking (press-fit) with protrusions provided on the panel, the fin base and the panel can be fixed with sufficient strength.
- FIG. 1 is an assembly diagram illustrating an overall configuration of a caulking heat sink according to Embodiment 1.
- FIG. FIG. 3 is a component diagram showing components of the caulking heat sink according to the first embodiment. It is process drawing which shows the caulking procedure of a caulking heat sink. It is a figure explaining the effect which a panel has on a wind path. It is a figure explaining the role of the punch hole provided in the panel in the caulking heat sink by Embodiment 2.
- FIG. It is sectional drawing showing the relationship between a fin base and a fin.
- FIG. 10 is a diagram for explaining the role of protrusions formed on a panel in a caulking heat sink according to Embodiment 3. It is a figure showing the variation of the projection part formed in the panel. It is sectional drawing showing the form of the panel inserted in the fin base.
- a side view and a plan view showing a structure of a cutting waste relief groove formed in a fin base In the caulking heat sink according to the fourth embodiment, a side view and a plan view showing a structure of a cutting waste relief groove formed in a fin base.
- FIG. 10 is a side view and a plan view showing a structure of a panel guide groove formed in a fin base in a caulking heat sink according to a fourth embodiment. It is a figure which shows the state which covered the panel with a protrusion on the fin base.
- FIG. 1 shows a heat sink integrated power module 100 according to Embodiment 1 of the present invention.
- the heat sink integrated power module 100 includes a caulking heat sink 30 and a power module unit 40.
- the caulking heat sink 30 includes a plurality of fins 1, a panel (intermediate member) 2, and a fin base 3.
- the power semiconductor element (chip) 19 is mounted on the lead frame 16 and joined to the lead frame 16 with solder or the like.
- the lead frame 16 is bonded to the fin base 3 via an insulating sheet 20.
- the heat module with integrated heat sink 100 is formed by embedding the fin base 3 on the heat radiating surface side of the power module unit 40 and performing transfer molding, sandwiching the panel 2, and post-caulking the fin 1.
- the fins are integrated.
- the panel 2 is press-fitted into the fin base 3 and placed on the outer peripheral portion (see FIG. 3).
- the mold resin (body) 18 of the power module section 40 is formed by transfer molding, it is possible to prevent a problem that the power semiconductor element is destroyed due to a load acting during caulking locally. That is, since the mold resin 18 is integrated as a structure, extreme stress concentration is prevented and stress is relieved. For this reason, the heat sink integrated power module 100 can ensure reliability by adopting a configuration in which it is integrated with a mold resin such as an epoxy resin and a similar hard resin.
- heat conductive grease consists of a filler and resin. Even if the heat conductive grease is used, no major trouble occurs, but when a bleed that separates the filler and the resin occurs, the contact thermal resistance of the heat conductive grease increases. Further, the warpage of the bottom surface of the power module changes with the temperature change of the power module, so that the distance between the bottom surface of the power module and the bottom surface of the heat sink changes, and a phenomenon of dryout occurs in which the heat conductive grease is driven out. Also in this case, the contact thermal resistance increases.
- the power semiconductor element 19 in addition to those formed of silicon (Si), those formed of a wide band gap semiconductor having a band gap larger than that of silicon can be suitably used.
- the wide band gap semiconductor include silicon carbide (SiC), a gallium nitride material, and diamond.
- FIG. 2 shows a form after assembling another caulking heat sink according to Embodiment 1 of the present invention.
- the caulking heat sink 30 includes a plurality of fins 1, a panel 2, and a fin base 3.
- a protruding wall portion 6 is formed on the fin side surface of the fin base 3.
- the plurality of fins 1 are supported by the protruding wall portions 6 of the fin base 3.
- the fin 1 is retrofitted to the fin base 3 integrated with the power module portion. Since the flat fin 1 can be adhered to the protruding wall portion 6 of the fin base 3 as much as possible, a heat sink integrated power module having a sufficiently low contact thermal resistance and high heat dissipation can be obtained.
- FIG. 3 shows a component diagram of the caulking heat sink according to the present invention, and shows a state before assembly.
- the panel 2 is formed with an opening 2 a that is larger than the size (width) of the protruding wall 6 of the fin base 3.
- the panel 2 is placed on and supported by the outer peripheral portion 3 a (first outer peripheral portion) of the fin base 3.
- the fin 1, the panel 2, and the fin base 3 are assembled by caulking after the assembly.
- the outer peripheral portion 3s of the fin base 3 is necessary in the process when being integrated with the mold resin. In this molding process, positioning pins are used.
- the outer peripheral portion 3a is disposed closer to the inner peripheral side of the fin base than the outer peripheral portion 3s (second outer peripheral portion).
- the thickness of the outer peripheral portion 3a is larger than the thickness of the outer peripheral portion 3s, but smaller than the thickness of the protruding wall portion 6. The thickness is measured from the power module mounting surface 3p.
- the fin 1 is attached to the fin side surface 3f of the fin base.
- the outer peripheral portion 3a and the outer peripheral portion 3s may be integrated as shown in FIG.
- the thickness (Ta) of the outer peripheral portion 3a and the thickness (Ts) of the outer peripheral portion 3s are thinner than the thickness (Tf) of the fin base.
- FIG. 4 shows the assembly process of the caulking heat sink.
- the fin base 3 is formed with an outer peripheral portion 3 a, a caulking portion 4, a fin insertion groove 5, and a protruding wall portion 6.
- the caulking portions 4 and the protruding wall portions 6 are alternately formed.
- the caulking portion 4 having a bifurcated shape is plastically deformed by a press load during caulking.
- Two insertion grooves (a first fin insertion groove 5a and a second fin insertion groove 5b) are formed between the protruding wall portions 6 facing each other with the caulking portion 4 interposed therebetween.
- the fin 1 is inserted into the fin insertion groove 5.
- the outer peripheral portion 3 a is provided on the outer periphery of the fin base 3 in order to sandwich the panel 2 between the protruding wall portions 6.
- the thickness of the outer peripheral portion 3 a is thinner than the thickness of the caulking portion 4 and the protruding wall portion 6.
- the panel 2 having the opening 2a is sandwiched between the outer periphery 3a.
- the plurality of fins 1 are inserted into the fin insertion grooves 5 so that the plurality of fins are sandwiched between the fin bases 3. That is, the first fin 1a is inserted into the first fin insertion groove 5a, and the second fin 1b is inserted into the second fin insertion groove 5b.
- the protruding wall portion 6 is in contact with the fin 1.
- FIG. 4D when the jig 21 is inserted between the fins and the caulking portion 4 is plastically deformed, the fin 1 is caulked and fixed to the fin base 3. In this manner, the caulking portion 4 is plastically deformed to the fin side by caulking, and the fin base 3 and the fin 1 are integrated by bringing the fin 1 into contact with both sides of the protruding wall portion 6 of the fin base 3.
- the white arrow represents the flow velocity vector 7.
- the white arrow represents the flow velocity vector 7.
- the panel 2 is sandwiched and integrated between the fin base 3 and the fin 1, as shown in FIG. 5A, even if the fin length is longer than the fin base length in the air path direction, Can be formed.
- FIG. 5B in the case of a caulking heat sink without a panel, an air path directed upward or downward from the fin base 3 is formed.
- the caulking heat sink according to the present application can improve the heat radiation performance because it can use the air path to the maximum without reducing the flow velocity between the fins.
- the fin base 3 and the panel 2 and the fin base 3 and the fin 1 are integrated in contact.
- the panel 2 can also be added to the heat dissipation path by heat conduction in each contact portion, so that the heat dissipation performance is improved.
- the fin 1 by using a plate material such as aluminum or aluminum alloy, it was possible to achieve both workability and heat dissipation.
- the fin base 3 is processed by machining, die casting, forging, extrusion, or the like, and the material is formed of aluminum, aluminum alloy, or the like.
- the fins 1 and the fin base 3 are not limited to aluminum materials, and may be a combination of different materials. For example, by making the fin a copper-based plate material, the heat dissipation is further improved as compared with the case of aluminum.
- the thickness of the fin 1 can be 0.6 mm to 1.0 mm
- the width of the fin insertion groove 5 can be 0.8 mm to 1.2 mm
- the fin pitch can be 3 mm to 5 mm. Since the heat path for heat radiation can be formed by the panel 2, the heat radiation performance can be improved even if the fin 1 having a length about twice the length of the fin base 3 is used in the air path direction.
- the caulking heat sink according to the present invention has a large degree of freedom in the length of the fin, and the fin base size can be freely designed, so that the fin base can be downsized.
- the fin base and the fin can be integrated with a low press load by adopting a structure in which the fin is pressed from both sides with respect to one protruding wall portion of the fin base as in this example.
- the air path can be secured regardless of the fin length and the fin base length, so that the heat sink integrated power module with high heat dissipation can be obtained.
- the wind path and the power module are separated from the cooling air by the panel, and an effect of blocking the wind from being directly applied to various electrodes of the power module can be obtained.
- the insulation distance to prevent the deterioration of insulation due to the stay of dust and dirt is ranked according to the degree of contamination, and if the degree of contamination is high, a large distance is required.
- By blocking the wind contact it is possible to reduce the degree of fouling, and the power module can be miniaturized.
- Embodiment 2 The fin integrated power module does not have a structure (function) for fixing to the power module when it is fixed to a structural member. If the fin is longer than the fin base, the fin causes radiation noise. Thus, there remains a problem that high-speed switching cannot be used in order to prevent the semiconductor element and the control circuit from malfunctioning.
- the structure of the caulking heat sink according to the second embodiment will be described with reference to FIG. 6 (FIGS. 6A to 6C).
- the panel 2 according to the second embodiment has the four holes 2b formed at the four corners.
- the heat generating portion 8 such as the caulking heat sink 30 and the power module portion 40 can be fixed with screws 9 as shown in FIG. 6B.
- the fixing member 10 and the caulking heat sink 30 can be fixed with screws 9.
- the panel 2 Since the panel 2 is produced by a die such as press working, it can be produced without any additional processing cost even if the punched hole 2b is produced. By making the punched hole 2b in the panel 2 and caulking the heat generating portion 8 or the fixing member 10 to the heat sink, the vibration resistance can be improved.
- the punched holes provided in the panel could also be used for positioning the panel and determining the panel orientation when the caulking heat sink was produced.
- the panel 2 Since the panel 2 according to the second embodiment has a mechanism for fixing the produced caulking heat sink 30, the heat generating portion 8 and the fixing member 10, the panel 2 is made of a metal having sufficient strength such as a galvanized steel plate or SUS. Is desirable. However, it is not necessarily a metal, and a resin material may be used. When a resin material is used for the panel 2, it is necessary to make the conductivity sufficiently high from the viewpoint of electrical noise.
- the thickness of the panel 2 is preferably larger than the thickness difference d between the outer peripheral portion 3a and the fin insertion groove 5 (see FIG. 7A).
- the fin is pressed in the panel direction from the fin side surface 3f facing the power module mounting surface 3p.
- the panel 2 can be integrated with the fin base 3 and the fin 1 with sufficient strength. Since both the fin 1 and the panel 2 and the contact between the panel 2 and the fin base 3 can be secured, the heat generating portion 8 or the fixing member 10 is connected via the panel 2 after the fin 1, the panel 2 and the fin base 3 are integrated. It was possible to improve the strength and vibration resistance when fixed to.
- Providing punched holes 2b not only improves strength and vibration resistance, but also increases the number of contact surfaces, creating many electrical contacts, reducing the electrical resistance between the panel and fins. there were.
- a grounding metal is attached to the panel, and the grounding terminal is configured so that the heat sink does not float with respect to the ground.
- a grounding metal fitting fixes a terminal for screwing the grounding line to a heat sink through a metal conductor, for example.
- Caulking heat sink basically considers fins, fin base and panel as one heat sink.
- the screw base is not required on the fin base, the fin base can be configured with a minimum volume, and the overall size can be reduced.
- the heat sink is provided with a ground terminal, and is connected to the ground using the ground terminal. If the impedance with the ground is high, the heat sink will behave as an antenna and disturb the space potential.
- the electrical resistance between the fin base, the fin, and the panel is suppressed, noise resistance is improved as a result, and an allowable amount against noise can be greatly guaranteed.
- the fin base and the panel are in contact with each other, heat can be transferred between the fin and the panel by heat conduction, so that the heat radiation performance can be improved. Further, by providing a hole in the panel as a mechanism for fixing the heat sink integrated power module, the manufactured heat sink integrated power module can be easily fixed to a fixing member or the like.
- FIG. 8 shows a caulking heat sink according to Embodiment 3 of the present invention.
- the panel 2 of the present embodiment is provided with at least one protrusion 12 on at least one of the short side and the long side.
- the distance Dp represents the distance between the protrusions facing each other in the long side direction.
- FIG. 8B shows the fin base 3.
- the distance Db represents the distance between the farthest protruding wall portions 6.
- the protrusion 12 of the panel 2 is manufactured so as to satisfy the interval Dp ⁇ the interval Db. As shown in FIG.
- the fin base 3 is crimped (press-fitted) to the fin base 3 by the protrusions 12, and the fin base 3 and the panel 2 with the protrusions are fixed.
- the panel 2 with protrusions and caulking the fin base 3 and the panel 2 are sufficiently fixed, and the fin 1 is further caulked to the fin base 3.
- the caulking heat sink after fabrication was a heat sink having sufficient vibration resistance.
- the fin base and the panel are formed by machining such as press punching, die casting and cutting. Since the heat sink cannot be assembled unless a clearance allowing for dimensional tolerances is secured, there is always a clearance between the fin base and the panel. This gap should be kept at a minimum of about 0.1mm. On the other hand, a dimensional tolerance of at least ⁇ 0.1mm is required. As a result, a gap of about 0.2 mm is generated between the fin base and the panel. If such a gap exists, the panel 2 is sandwiched with the gap generated in the horizontal direction with respect to the fin base 3.
- the panel is placed on the outer periphery 3a (first outer periphery).
- the outer peripheral portion 3a is arranged on the inner peripheral side with respect to the outer peripheral portion 3s (second outer peripheral portion), and the thickness of the outer peripheral portion 3a is thicker than the thickness of the outer peripheral portion 3s but thinner than the thickness of the caulking portion 4.
- the projection 12 of the panel since the projection 12 of the panel has a size that causes the fin base to be plastically deformed and bite in, a state in which there is no gap after integration can be realized. Therefore, the effect of improving the vibration resistance of the caulking heat sink could be exhibited.
- the fin base and the panel are in sufficient contact, the contact thermal resistance between the fin base and the panel can be reduced, and the heat dissipation performance of the caulking heat sink can be improved.
- the electrical resistance value from the panel to the fin is a member. It was possible to stably reduce the resistance level.
- the variation in electrical resistance before and after the vibration test and the thermal cycle test could be reduced to several percent.
- the structure has a large vibration resistance because it has sufficient rigidity even when it is fixed to a fixing member via a hole in the panel.
- FIG. 9 Supplied with reference to FIG. 9 (FIGS. 9A to 9C) is a supplementary explanation of the shape of the projection 12 of the panel.
- the shape of the protrusion 12 is not particularly limited as long as it is an acute angle shape (FIG. 9A), an R shape (FIG. 9B), a square shape (FIG. 9C), or the like.
- the shape was an R shape or an acute angle shape
- the fin base and the panel could be integrated at a low pressure during caulking.
- the material of the panel is metal
- the radiation noise suppressing effect is enhanced.
- the radiation noise suppression effect was further enhanced by making the outer size of the panel the same as or longer than the total length of the fins.
- Embodiment 4 FIG.
- the panel 2 is often formed of a material harder than the fin base 3.
- the projections of the panel scrape the fin base, and caulking is performed to fix the fin base and the panel with projections.
- cutting scraps 13 such as aluminum scraps cut by the projections of the panel may be generated, and the panel may be fixed in an inclined state with respect to the fin base.
- the panel is fixed to the fin base in an inclined state, when the fin is caulked to the fin base, the contact area between the fin 1 and the projecting wall portion 6 is reduced at the position where the panel floats.
- the fin strength after caulking is lowered.
- a cutting waste relief groove 14 is formed in advance on the fin base 3 according to the present embodiment.
- the cutting waste relief groove 14 formed in the outer peripheral portion 3a of the fin base 3 is provided in a lower portion of a portion where the fin base is cut by the projection portion of the panel.
- the fin base according to the present embodiment when the fin base and the panel are integrated, when the panel and the fin base are caulked, it is possible to stably prevent the panel from being fixed in a floating state. It was possible.
- a panel guide groove 15 is formed in a portion where the fin base is cut by the projection 12 of the panel.
- productivity when caulking (press-fitting) the panel and fin base has been improved.
- the panel guide groove 15 formed in the fin base projecting wall 6 is made shorter than the length of the projection 12 of the panel.
- FIG. 14 FIG. 14A
- the chip base relief groove 14 and the panel guide groove 15 are formed in the fin base 3.
- the projection 12 of the panel is engaged with the panel guide groove 15.
- the panel 2 is press-fitted into the fin base 3.
- the cutting waste 13 generated from the protruding wall portion 6 is accommodated in the cutting waste escape groove 14.
- the panel can be set horizontally with respect to the fin base before caulking.
- the positioning of the panel and the fin base has been simplified and productivity has been improved. It should be noted that the vibration resistance and electrical resistance before and after the cutting waste relief groove 14 and the panel guide groove 15 were produced on the fin base were good without change.
- FIG. 15 illustrates a heat sink integrated power module 100 according to the fifth embodiment of the present invention.
- the heat sink integrated power module 100 includes a control board 17.
- the power semiconductor element 19 is bonded to the lead frame 16.
- the lead frame 16 is bonded to the fin base 3 via an insulating sheet 20.
- An external signal is input to the control board 17 to control the plurality of power semiconductor elements 19.
- FIG. 15 an example of a power module in which the control board 17 is integrally sealed with the mold resin 18 is shown, but other configurations have the same configuration, thereby having high heat dissipation performance and rigidity.
- a power module with integrated heat sink is shown, but other configurations have the same configuration, thereby having high heat dissipation performance and rigidity.
- FIG. 6 The structure of the caulking heat sink according to the sixth embodiment will be described with reference to FIG.
- the fin base 3 according to Embodiment 6 has no protruding wall portion between the caulking portion and the caulking portion.
- the caulking portion 4 having a bifurcated shape is deformed left and right, and caulking is performed from both sides of the fin by caulking portions, and the fin is fixed.
- the fin base 3 is formed with a first fin insertion groove 5a and a second fin insertion groove 5b with a caulking portion 4 having a bifurcated shape interposed therebetween.
- a panel is mounted in the outer peripheral part 3a (1st outer peripheral part).
- the outer peripheral portion 3a is arranged on the inner peripheral side with respect to the outer peripheral portion 3s (second outer peripheral portion), and the thickness of the outer peripheral portion 3a is thicker than the thickness of the outer peripheral portion 3s but thinner than the thickness of the caulking portion 4.
- the power semiconductor element When SiC is used for the power semiconductor element, the power semiconductor element is operated at a higher temperature than that of Si in order to take advantage of its characteristics. In a power module equipped with a SiC device, higher reliability is required as a power semiconductor element. Therefore, the merit of the present invention for realizing a highly reliable power module becomes more effective.
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Abstract
Description
図1は、本発明の実施の形態1におけるヒートシンク一体型パワーモジュール100を示している。ヒートシンク一体型パワーモジュール100は、かしめヒートシンク30とパワーモジュール部40を備えている。かしめヒートシンク30は、複数のフィン1、パネル(中間部材)2およびフィンベース3から構成される。電力半導体素子(チップ)19は、リードフレーム16の上に搭載され、リードフレーム16とはんだ等で接合されている。リードフレーム16は絶縁シート20を介してフィンベース3に接着されている。
フィン一体化パワーモジュールには、構造部材に固定する際に、パワーモジュール側に固定するための構造(機能)が存在しない、フィンの長さがフィンベースよりも長い場合、フィンが放射ノイズの原因となり、半導体素子や制御回路を誤動作させる事を防止するために高速なスイッチングが使えないといった課題が残されていた。実施の形態2に係るかしめヒートシンクの構成を図6(図6A~図6C)に基づいて説明する。実施の形態2に係るパネル2は、図6Aに示すように、抜き穴2bが4隅に形成されている。抜き穴2bを設けたことにより図6Bのように、かしめヒートシンク30とパワーモジュール部40などの発熱部8をねじ9で固定することができる。また、図6Cに示すように、固定用部材10とかしめヒートシンク30をねじ9で固定することができる。
図8は本発明の実施の形態3におけるかしめヒートシンクを示すものである。図8Aに示すように、本実施の形態のパネル2には短辺側、長辺側の少なくとも一方に、少なくとも1個以上の突起部12が設けられている。間隔Dpは長辺方向に対向する突起部の距離を表している。図8Bはフィンベース3を表している。間隔Dbは最も離れている突壁部6の距離を表している。パネル2の突起部12は間隔Dp<間隔Dbを満足するように製作する。図8Cに示すように、突起部12によってフィンベース3にかしめ加工(圧入)し、フィンベース3と突起付のパネル2を固定する。突起付のパネル2を使用し、フィンベース3とパネル2をかしめ加工することで、フィンベース3とパネル2が十分に固定された状態で、さらにフィン1をフィンベース3にかしめ加工するため、作製後のかしめヒートシンクは十分に耐振動性を有したヒートシンクとなった。
パネル2はフィンベース3よりも硬い材料で形成することが多い。フィンベースと突起付のパネルをかしめ加工する際、パネルの突起部がフィンベースを削って、かしめ加工が実施され、フィンベースと突起付のパネルが固定される。このため、図10に示すように、パネルの突起部によって切削されたアルミ屑などの切削屑13が発生し、パネルがフィンベースに対して、傾いた状態で固定される場合が在りうる。パネルがフィンベースに対して、傾いた状態で固定されると、フィンをフィンベースにかしめ加工した際に、パネルが浮いた側の箇所では、フィン1と突壁部6との接触面積が減少し、かしめ後のフィン強度が低下することが考えられる。
図15は、本発明の実施の形態5における、ヒートシンク一体型パワーモジュール100を示している。ヒートシンク一体型パワーモジュール100は、制御基板17を備えている。電力半導体素子19はリードフレーム16に接合されている。リードフレーム16は絶縁シート20を介してフィンベース3に接着されている。制御基板17に外部信号を入力し、複数の電力半導体素子19を制御する。ここでは、制御基板17を一体的にモールド樹脂18で封止したパワーモジュールの例を示しているが、他の構成のものでも同様の構成とすることで、放熱性能の高い、剛性を有したヒートシンク一体型パワーモジュールとなる。
実施の形態6に係るかしめヒートシンクの構成を図16に基づいて説明する。実施の形態6に係るフィンベース3は、かしめ部とかしめ部の間に突壁部がない。このかしめヒートシンクでは二股形状を有するかしめ部4を左右に変形させてフィンの両側からかしめ部でかしめ加工して、フィンが固定される。フィンベース3には、二股形状を有するかしめ部4を挟んで第1フィン挿入溝5aおよび第2フィン挿入溝5bが形成されている。パネルは外周部3a(第1外周部)に載置される。外周部3aは外周部3s(第2外周部)よりも内周側に配設され、外周部3aの厚さは外周部3sの厚さよりも厚いがかしめ部4の厚さよりも薄い。
2a 開口部、2b 抜き穴、3 フィンベース、3a 外周部、
3s 外周部、3p パワーモジュール取付け面、3f フィン側面、
4 かしめ部、5 フィン挿入溝、5a 第1フィン挿入溝、
5b 第2フィン挿入溝、6 突壁部、7 流速ベクトル、8 発熱部、
9 ねじ、10 固定用部材、12 突起部、13 切削屑、
14 切削屑逃げ溝、15 パネル誘導溝、16 リードフレーム、
17 制御基板、18 モールド樹脂、19 電力半導体素子、
20 絶縁シート、21 治具、30 かしめヒートシンク、
40 パワーモジュール部、
100 ヒートシンク一体型パワーモジュール。
Claims (13)
- 外周部を有し、二股形状を有するかしめ部を挟んで第1フィン挿入溝および第2フィン挿入溝が形成されているフィンベースと、
前記フィンベースの第1フィン挿入溝に前記かしめ部を使って固定されている第1フィンと、
前記フィンベースの第2フィン挿入溝に前記かしめ部を使って固定されている第2フィンと、
開口部を有し、前記フィンベースの外周部に載置されているパネルとを備えていて、
前記外周部の厚さは前記フィンベースの厚さよりも薄いかしめヒートシンク。 - 前記フィンベースは、前記かしめ部を挟んで相対向する突壁部を有することを特徴とする請求項1に記載のかしめヒートシンク。
- 前記パネルの厚さは、前記外周部と前記第1フィン挿入溝の厚み差よりも大きいことを特徴とする請求項1または2に記載のかしめヒートシンク。
- 前記パネルの開口部には、突起部が形成されていることを特徴とする請求項2に記載のかしめヒートシンク。
- 前記外周部には、前記パネルの突起部に対応する位置に溝が形成されていることを特徴とする請求項4に記載のかしめヒートシンク。
- 前記突壁部には、前記パネルの突起部に対応する位置に溝が形成されていることを特徴とする請求項4または5に記載のかしめヒートシンク。
- 前記外周部は、厚さの異なる第1外周部と第2外周部を有し、
前記パネルは前記第1外周部に載置されていて、
前記第1外周部は前記第2外周部よりも内周側に配設され、
前記第1外周部の厚さは前記第2外周部の厚さよりも厚いが前記かしめ部の厚さよりも薄いことを特徴とする請求項1または2に記載のかしめヒートシンク。 - 前記パネルの厚さは、前記第1外周部と前記第1フィン挿入溝の厚み差よりも大きいことを特徴とする請求項7に記載のかしめヒートシンク。
- 前記パネルの開口部には、突起部が形成されていることを特徴とする請求項7に記載のかしめヒートシンク。
- 前記第1外周部には、前記パネルの突起部に対応する位置に溝が形成されていることを特徴とする請求項9に記載のかしめヒートシンク。
- 前記フィンベースの突壁部には、前記パネルの突起部に対応する位置に溝が形成されていることを特徴とする請求項9または10に記載のかしめヒートシンク。
- 前記第1フィンと前記第2フィンは、風路方向の長さが、前記フィンベースの風路方向の長さよりも大きいことを特徴とする請求項1から11のいずれか1項に記載のかしめヒートシンク。
- 請求項1から12のいずれか1項に記載のかしめヒートシンクと、
電力半導体素子と、
前記電力半導体素子を封止する封止樹脂体とを備えているヒートシンク一体型パワーモジュール。
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US15/024,953 US9892992B2 (en) | 2013-09-27 | 2014-09-19 | Swaged heat sink and heat sink integrated power module |
CN201480053065.0A CN105580134B (zh) | 2013-09-27 | 2014-09-19 | 铆接散热器、散热器一体型功率模块、及它们的制造方法 |
JP2015539157A JP6091633B2 (ja) | 2013-09-27 | 2014-09-19 | かしめヒートシンク、ヒートシンク一体型パワーモジュール、かしめヒートシンクの製造方法、および、ヒートシンク一体型パワーモジュールの製造方法 |
DE112014004421.0T DE112014004421B4 (de) | 2013-09-27 | 2014-09-19 | Verpresster Kühlkörper und Leistungsmodul mit integriertem Kühlkörper |
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CN105580134A (zh) | 2016-05-11 |
DE112014004421T5 (de) | 2016-06-09 |
CN105580134B (zh) | 2018-09-18 |
DE112014004421B4 (de) | 2021-07-08 |
JPWO2015046040A1 (ja) | 2017-03-09 |
JP6091633B2 (ja) | 2017-03-08 |
US20160225691A1 (en) | 2016-08-04 |
US9892992B2 (en) | 2018-02-13 |
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