JP7196815B2 - 半導体モジュール及び電力変換装置 - Google Patents
半導体モジュール及び電力変換装置 Download PDFInfo
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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実装した状態を示す断面図である。半導体モジュール1が、放熱フィンを有するヒートシンク2の上にグリース3を介して実装されている。プリント基板4が半導体モジュール1の上方に配置されている。半導体モジュール1のリード端子5がモールド樹脂6から突出してプリント基板4のスルーホール7に挿入され、プリント基板4の回路に接続されている。
図10は、実施の形態2にかかる半導体モジュールを示す断面図である。N側リードフレーム8は、リード端子8aとダイパッド8bとの間に設けられ、リード端子8aとダイパッド8bよりも小さい断面積を持つ繋ぎ部8cを有する。これにより、ワイヤ20がボンディングされるダイパッド8bとリード端子8aとの間の熱抵抗が上昇するため、リード端子8a側への伝熱を更に抑制することができる。なお、繋ぎ部8cは直線的な形状でもよいし、屈曲した形状でもよい。また、出力側リードフレーム9に繋ぎ部を設けても同様の効果を得ることができる。
図11は、実施の形態3にかかる半導体モジュールを示す断面図である。出力側リードフレーム9とP側リードフレーム10の下面には放熱シート12が密着している。一方、N側リードフレーム8の下面は放熱シート12で覆われていない。放熱シート12の下面とN側リードフレーム8の下面はモールド樹脂6から露出し、互いに面一になっている。モジュール実装時には、露出した放熱シート12の下面とN側リードフレーム8の下面がヒートシンク2と密着する。ここで、実施の形態1の構成では比較例よりも放熱シート12の面積を拡大する必要がある。これに対して、本実施の形態では放熱シート12の必要面積を実施の形態1よりも縮小することができるため、製品コストを低減することができる。
図13は、実施の形態4にかかる半導体モジュールを示す断面図である。モールド樹脂6から引き出されたリード端子5の先端部の厚みがリード端子5の根元部よりも厚い。
図17は、実施の形態5にかかる半導体モジュールを示す断面図である。モールド樹脂6から引き出されたリード端子5の先端部に金属製のアタッチメント26が接合されている。このようにリード端子5に外付けのアタッチメント26を取り付けて端子厚みを増大させても実施の形態4と同様の効果が得られる。アタッチメント26はリード端子5とプリント基板4の導電性を確保するために種々の金属素材で形成される。
本実施の形態は、実施の形態1~5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。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、実施の形態6として、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 (10)
- 絶縁性の放熱シートと、
前記放熱シートの上に設けられた半導体素子と、
一体的に構成されたリード端子とダイパッドを有するリードフレームと、
前記リードフレームと前記半導体素子を接続し、主電流経路となるワイヤと、
前記放熱シート、前記半導体素子、前記リードフレーム、及び前記ワイヤを封止するモールド樹脂とを備え、
前記リード端子が前記モールド樹脂から引き出され、
前記ダイパッドの下面に前記放熱シートが直接的に接触し、
前記ダイパッドと前記放熱シートの接触部分の真上において前記ワイヤが前記ダイパッドにボンディングされ、
前記リードフレームは、前記リード端子と前記ダイパッドとの間に設けられ、前記リード端子と前記ダイパッドよりも小さい断面積を持つ繋ぎ部を有することを特徴とする半導体モジュール。 - 前記リードフレームは、前記リード端子と前記ダイパッドとの間に段差を有す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。
- 前記半導体素子は、N側半導体素子と、前記N側半導体素子のP側に接続されたP側半導体素子とを有し、
前記リードフレームは、前記N側半導体素子と前記ワイヤにより接続されてい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。 - 絶縁性の放熱シートと、
前記放熱シートの上に設けられた半導体素子と、
一体的に構成されたリード端子とダイパッドを有するリードフレームと、
前記リードフレームと前記半導体素子を接続し、主電流経路となるワイヤと、
前記放熱シート、前記半導体素子、前記リードフレーム、及び前記ワイヤを封止するモールド樹脂と、
前記半導体素子のN側に接続されたN側半導体素子と、
前記N側半導体素子とワイヤ接続されたN側リードフレームとを備え、
前記リード端子が前記モールド樹脂から引き出され、
前記ダイパッドの下面に前記放熱シートが直接的に接触し、
前記ダイパッドと前記放熱シートの接触部分の真上において前記ワイヤが前記ダイパッドにボンディングされ、
前記N側リードフレームのワイヤボンディング部分の下面は前記放熱シートで覆われておらず、前記モールド樹脂から露出していることを特徴とする半導体モジュール。 - 前記N側リードフレームの下面に塗布された絶縁材を更に備えることを特徴とする請求項4に記載の半導体モジュール。
- 前記半導体素子は3相交流電圧回路用の半導体素子を有し、
1つの前記リードフレームが前記3相交流電圧回路用の半導体素子とそれぞれワイヤにより接続されていることを特徴とする請求項1~3の何れか1項に記載の半導体モジュール。 - 前記モールド樹脂から引き出された前記リード端子の先端部の厚みが前記リード端子の根元部よりも厚いことを特徴とする請求項1~6の何れか1項に記載の半導体モジュール。
- 前記モールド樹脂から引き出された前記リード端子の先端部に接合された金属製のアタッチメントを更に備えることを特徴とする請求項1~6の何れか1項に記載の半導体モジュール。
- 前記半導体素子はワイドバンドギャップ半導体によって形成されていることを特徴とする請求項1~8の何れか1項に記載の半導体モジュール。
- 入力される電力を変換して出力する請求項1~9の何れか1項に記載の半導体モジュールと、
前記半導体モジュールを制御する制御信号を前記半導体モジュールに出力する制御回路と、
前記半導体モジュールの熱を放熱するヒートシンクとを備えることを特徴とする電力変換装置。
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