JP6881238B2 - 半導体モジュール、その製造方法及び電力変換装置 - Google Patents
半導体モジュール、その製造方法及び電力変換装置 Download PDFInfo
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- JP6881238B2 JP6881238B2 JP2017210900A JP2017210900A JP6881238B2 JP 6881238 B2 JP6881238 B2 JP 6881238B2 JP 2017210900 A JP2017210900 A JP 2017210900A JP 2017210900 A JP2017210900 A JP 2017210900A JP 6881238 B2 JP6881238 B2 JP 6881238B2
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Landscapes
- Engineering & Computer Science (AREA)
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
- Inverter Devices (AREA)
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Description
図1は、実施の形態1に係る半導体モジュールを示す断面図である。放熱板1は、例えば一辺の長さが30〜300mm、厚さが3〜20mmであるCu、Cu合金複合体、Al、又はAl合金複合体からなる熱容量の大きい放熱板である。放熱板1は複数フィンを備えたヒートシンク又は水冷ジャケットなどに放熱グリスを介して接続される。または、放熱板1自体が下面側に複数フィンを備えたヒートシンクであるか、又は水冷ジャケットと一体化されていてもよい。放熱板1の素子搭載面には回路が形成されている。放熱板1は絶縁材が内部に埋め込まれた放熱一体成型でもよいし、回路が加熱又はプレスにより一体化されていてもよい。
図2は、実施の形態2に係る半導体モジュールを示す断面図である。本実施の形態では、放熱板1の外周部に半導体モジュールの外郭となるケース10が接着剤等により接着されている。ケース10は半導体素子2,3等の周囲を囲んでいる。ケース10はPPS又はPBT等樹脂からなり、厚さ1mm程度の銅又は銅合金からなる端子11,12及び信号端子(不図示)と一体成型されている。
図3は、実施の形態3に係る半導体モジュールを示す断面図である。本実施の形態では、実施の形態1に比べて導体板14,16が無く、配線17,18が接合材13,15に直接的にボンディングされている。接合材13,15は金属の焼結材である。金属の焼結材はブロック状の金属体であるため、配線17,18を接合材13,15に直接的にボンディングすることができる。導体板14,16が無いため、工数及びコストを削減することができる。また、接合材13,15は、焼結材の隙間に樹脂を入り込ませたものであることが好ましい。これにより、接合材13,15が低弾性化されるため、ワイヤボンディング時の半導体素子2,3に対するダメージを抑制することができる。また、焼結材がCuであれば、Cuを主成分とする配線17,18とCu同士の高品質、高信頼性の接合を得ることができる。
図4は、実施の形態4に係る半導体モジュールを示す断面図である。本実施の形態では、絶縁基板21は放熱性を有す放熱板1上に接合材22を介して接合されている。放熱板1の外周部にケース10が接着剤等により接着されている。ケース10は半導体素子2,3等の周囲を囲んでいる。ケース10は端子11,12及び信号端子(不図示)と一体成型されている。ケース10の内部は、エポキシを主成分とした樹脂又はゲル状のシリコーン樹脂の封止材20により封止される。この場合でも硬いCuワイヤにてボンディング可能である。その他の構成及び効果は実施の形態3と同様である。
本実施の形態は、上述した実施の形態1〜4に係る半導体モジュールを電力変換装置に適用したものである。電力変換装置は、例えば、インバータ装置、コンバータ装置、サーボアンプ、電源ユニットなどである。本発明は特定の電力変換装置に限定されるものではないが、以下、三相のインバータに本発明を適用した場合について説明する。
Claims (11)
- 上面電極を有する半導体素子と、
前記上面電極に接合された接合材と、
前記接合材に直接的に超音波接合されたワイヤ又はリボンボンド材である配線とを備え、
前記接合材は金属の焼結材であって、前記焼結材の隙間に樹脂を入り込ませたものであることを特徴とする半導体モジュール。 - 前記配線はCuを主成分とし、
前記焼結材はCuであることを特徴とする請求項1に記載の半導体モジュール。 - 前記半導体素子が実装された絶縁基板を更に備えることを特徴とする請求項1又は2に記載の半導体モジュール。
- 前記絶縁基板が実装された放熱板を更に備えることを特徴とする請求項3に記載の半導体モジュール。
- 請求項1〜4の何れか1項に記載の半導体モジュールを有し、入力される電力を変換して出力する主変換回路と、
前記主変換回路を制御する制御信号を前記主変換回路に出力する制御回路とを備えることを特徴とする電力変換装置。 - 微小金属粒子及び樹脂を含むシート状の接合材を準備する工程と、
前記接合材を導体板に仮付けし、一体化する工程と、
一体化された前記接合材を加熱して焼結させ、一体化された前記接合材を介して前記導体板を半導体素子の上面電極に接合する工程と、
ワイヤ又はリボンボンド材である配線を前記導体板に超音波接合する工程と、を含むことを特徴とする半導体モジュールの製造方法。 - 微小金属粒子及び樹脂を含むシート状の接合材を準備する工程と、
前記接合材を導体板に仮付けし、一体化する工程と、
一体化された前記接合材を加熱して焼結させ、一体化された前記接合材を介して前記導体板を半導体素子の上面電極に接合すると同時に、前記シート状の前記接合材を加熱して焼結させ、前記シート状の前記接合材を介して前記半導体素子の前記上面電極と反対側の面を放熱板に接合する工程と、
ワイヤ又はリボンボンド材である配線を前記導体板に超音波接合する工程と、を含むことを特徴とする半導体モジュールの製造方法。 - 前記接合材を前記導体板に仮付けし、一体化する工程は、前記接合材を前記導体板に接着することを含むことを特徴とする請求項6又は7に記載の半導体モジュールの製造方法。
- 前記接合材は、加熱及び加圧し、焼結させることを特徴とする請求項6〜8の何れか1項に記載の半導体モジュールの製造方法。
- 前記導体板は多層板であることを特徴とする請求項6〜9の何れか1項に記載の半導体モジュールの製造方法。
- 前記配線はCuを主成分とすることを特徴とする請求項6〜10の何れか1項に記載の半導体モジュールの製造方法。
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