JP6742540B2 - 半導体装置及び電力変換装置 - Google Patents
半導体装置及び電力変換装置 Download PDFInfo
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- JP6742540B2 JP6742540B2 JP2019559457A JP2019559457A JP6742540B2 JP 6742540 B2 JP6742540 B2 JP 6742540B2 JP 2019559457 A JP2019559457 A JP 2019559457A JP 2019559457 A JP2019559457 A JP 2019559457A JP 6742540 B2 JP6742540 B2 JP 6742540B2
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- metal electrode
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Description
まず、本発明の実施の形態に係る半導体装置について説明する前に、これと関連する半導体装置(以下、「関連半導体装置」と記す)について説明する。
図2は、本発明の実施の形態1に係る半導体装置の概略構成を示す断面図である。なお、本実施の形態1に係る構成要素のうち、関連半導体措置の構成要素と同じまたは類似する構成要素については同じ参照符号を付して説明する。
温度サイクルまたはパワーサイクルによって金属電極5が加熱または発熱すると、金属電極5は膨張するが、線膨張係数が低い半導体素子4及び絶縁基板2に接している封止樹脂6はこれらに拘束される。このため、封止樹脂6は、金属電極5から応力を受けることになる。この際、封止樹脂6は、鈍角形状を有する端縁部分5bから集中的に応力を受けにくく、鋭角形状を有する端縁部分5aから集中的に応力を受やすくなっている。
図3は、本発明の実施の形態2に係る半導体装置の概略構成を示す断面図である。以下、本実施の形態2に係る構成要素のうち、以上の構成要素と同じまたは類似する構成要素については同じ参照符号を付し、異なる構成要素について主に説明する。
以上のような本実施の形態2に係る半導体装置によれば、実施の形態1と同様に、側部5cを起点とする、ワイヤ9から比較的遠いクラック8を優先的に発生することができる。このため、クラックがワイヤ9の周辺箇所などの、望ましくない箇所に発生することを抑制することができる。この結果、ワイヤ9の断線を抑制することができ、半導体装置の信頼性及び寿命を高めることができる。
図4は、本発明の実施の形態3に係る半導体装置の概略構成を示す断面図である。以下、本実施の形態3に係る構成要素のうち、以上の構成要素と同じまたは類似する構成要素については同じ参照符号を付し、異なる構成要素について主に説明する。
以上のような本実施の形態3に係る半導体装置によれば、クラック8が発生しやすい上側の端縁部分5aを、実施の形態1よりも半導体素子4から遠ざけることができるので、クラックが発生する箇所をより効果的にコントロールすることができ、半導体装置の信頼性及び寿命をより高めることができる。また一般的に、はんだ付け工程などの製品組み立て時に発生する応力によって、金属電極5の図4の奥行き方向の延在を妨げるような曲げ応力が発生することがある。これに対して本実施の形態3によれば、図4の形状によって、当該曲げ応力に対する強度を向上させることができるので、金属電極5の変形を抑制することができ、製品品質を高めることができる。
図5は、本発明の実施の形態4に係る半導体装置の金属電極5の概略構成を示す平面図である。以下、本実施の形態4に係る構成要素のうち、以上の構成要素と同じまたは類似する構成要素については同じ参照符号を付し、異なる構成要素について主に説明する。
以上のような本実施の形態4によれば、クラックが発生する箇所をより効果的にコントロールすることができる。また、クラックの発生を分散することができ、各クラックのサイズを小さくすることができる。
図6は、本発明の実施の形態5に係る半導体装置の金属電極5の概略構成を示す平面図である。以下、本実施の形態5に係る構成要素のうち、以上の構成要素と同じまたは類似する構成要素については同じ参照符号を付し、異なる構成要素について主に説明する。
金属電極5の半導体素子4に近い側部5cは、金属電極5と半導体素子4との線膨張係数の差の影響が比較的大きく、金属電極5の半導体素子4から遠い側部5dは、金属電極5と半導体素子4との線膨張係数の差の影響が比較的小さい。このため、封止樹脂6が金属電極5の側部5cから受ける応力は、封止樹脂6が金属電極5の側部5dから受ける応力よりも大きくなるので、側部5cを起点とする、ワイヤ9から比較的遠いクラック8を優先的に発生することができる。したがって、クラックが発生する箇所を効果的にコントロールすることができる。
本発明の実施の形態6に係る電力変換装置は、実施の形態1〜5のいずれかに係る半導体装置を有する主変換回路を備えた電力変換装置である。以上で説明した半導体装置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、本実施の形態6として、三相のインバータに、実施の形態1〜5のいずれかに係る半導体装置を適用した場合について説明する。
Claims (9)
- 半導体素子を含む電子回路と、
前記電子回路と直接接続された金属電極と、
前記電子回路と前記金属電極とを封止する樹脂と
を備え、
前記金属電極の前記電子回路と対面する側と逆側の面の端縁部分は鋭角形状を有し、前記金属電極の前記電子回路と対面する面の端縁部分は円弧形状または鈍角形状を有する、半導体装置。 - 半導体素子及び回路要素を含む電子回路と、
前記電子回路と直接接続された金属電極と、
前記電子回路と前記金属電極とを封止する樹脂と
を備え、
前記金属電極の前記回路要素と対面する側と逆側の部分は鋭角形状を有し、前記金属電極の前記回路要素と対面する部分は円弧形状または鈍角形状を有する、半導体装置。 - 請求項2に記載の半導体装置であって、
前記回路要素はワイヤを含む、半導体装置。 - 請求項1に記載の半導体装置であって、
前記金属電極の端部側の部分は、上方に向かって折り曲げられた形状を有する、半導体装置。 - 請求項1から請求項4のうちのいずれか1項に記載の半導体装置であって、
前記金属電極は突起部を有し、
前記突起部の先端が向く方向以外の方向に前記電子回路が配設されている、半導体装置。 - 請求項2に記載の半導体装置であって、
前記金属電極は、前記回路要素の側方、かつ、前記半導体素子の上方に配設され、
前記金属電極の前記回路要素と対面する側と逆側の部分が、前記金属電極の前記回路要素と対面する部分よりも前記半導体素子に近づくように、前記金属電極が前記半導体素子に対して傾斜されている、半導体装置。 - 請求項1から請求項6のうちのいずれか1項に記載の半導体装置であって、
前記半導体素子は、ワイドバンドギャップ半導体を含む、半導体装置。 - 半導体素子を用いる半導体装置であって、
前記半導体素子及び回路要素を含む電子回路と、
前記電子回路と直接接続され、前記電子回路の側方、かつ、前記半導体素子の上方に配設された金属電極と、
前記電子回路と前記金属電極とを封止する樹脂と
を備え、
前記金属電極の前記回路要素と対面する側と逆側の部分が、前記金属電極の前記回路要素と対面する部分よりも前記半導体素子に近づくように、前記金属電極が前記半導体素子に対して傾斜されている、半導体装置。 - 請求項1から請求項8のうちのいずれか1項に記載の半導体装置を有し、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、電力変換装置。
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