JP6927437B1 - パワーモジュールおよび電力変換装置 - Google Patents
パワーモジュールおよび電力変換装置 Download PDFInfo
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- JP6927437B1 JP6927437B1 JP2020544056A JP2020544056A JP6927437B1 JP 6927437 B1 JP6927437 B1 JP 6927437B1 JP 2020544056 A JP2020544056 A JP 2020544056A JP 2020544056 A JP2020544056 A JP 2020544056A JP 6927437 B1 JP6927437 B1 JP 6927437B1
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Abstract
Description
層および下面に金属層が設けられた絶縁基板と、半導体素子の裏面と絶縁層の上面側の金
属層の上面とを接合し、半導体素子の裏面側の外周よりも大きい上面を有する焼結性接合
部材と、絶縁基板の下面と接合されるベース板と、半導体素子のおもて面に接合する配線
部材と、を備え、半導体素子、ベース板と絶縁基板とを接合した構造体、配線部材、焼結
性接合部材の順に弾性率が大きくなる、パワーモジュールである。
図1は、実施の形態1におけるパワーモジュールを示す断面構造模式図である。図2は、実施の形態1におけるパワーモジュールを示す平面構造模式図である。図1は、図2の一点鎖線AAにおける断面構造模式図である。図2は、封止部材9を透過して、パワーモジュール100を上面から見た平面構造模式図である。
本実施の形態2においては、実施の形態1で用いた焼結性接合部材2の上面に複数の半導体素子1を設けたことが異なる。このように、複数の半導体素子1を複数の半導体素子1の配置領域よりも大きく、半導体素子1の配置領域から外側へ突出した平坦部23を有する焼結性接合部材2の同一上面に配置したので、半導体素子1で発生した熱を焼結性接合部材2の平坦部23まで拡げて拡散することができる。その結果、半導体素子1からの放熱性の向上が可能となり、パワーモジュール300の信頼性を向上することができる。なお、その他の点については、実施の形態1と同様であるので、詳しい説明は省略する。
本実施の形態3においては、実施の形態1,2で用いたボンディングワイヤ10とリード端子12との替わりに主端子接合層16と板状金属部材である主端子15とを設けたことが異なる。このように、半導体素子1の上面に形成した電極と外部との接続構造を主端子接合層16と主端子15との構成とした場合においても、複数の半導体素子1を複数の半導体素子1の配置領域よりも大きく、半導体素子1の配置領域から突出した平坦部23を有する焼結性接合部材2の上面に配置したので、半導体素子1で発生した熱を焼結性接合部材2の平坦部23まで拡げて拡散することができる。その結果、半導体素子1からの放熱性の向上が可能となり、パワーモジュール400の信頼性を向上することができる。なお、その他の点については、実施の形態1,2と同様であるので、詳しい説明は省略する。
本実施の形態4は、上述した実施の形態1から3のいずれかに係るパワーモジュールを電力変換装置に適用したものである。本開示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4として、三相のインバータに本開示を適用した場合について説明する。
Claims (14)
- 半導体素子と、
絶縁層を有し、前記絶縁層の上面に回路層および下面に金属層が設けられた絶縁基板と、
前記半導体素子の裏面と前記絶縁層の上面側の前記回路層の上面とを接合し、前記半導体素子の裏面側の外周よりも大きい上面を有する焼結性接合部材と、
前記絶縁基板の下面と接合されるベース板と、
前記半導体素子のおもて面に接合する配線部材とを備え、
前記半導体素子、前記ベース板と前記絶縁基板とを接合した構造体、前記配線部材、前記焼結性接合部材の順に弾性率が大きくなる、パワーモジュール。 - 半導体素子と、
絶縁層を有し、前記絶縁層の上面に回路層および下面に金属層が設けられた絶縁基板と、
前記半導体素子の裏面と前記絶縁層の上面側の前記回路層の平坦な上面とを接合し、前記半導体素子の裏面側の外周よりも大きい平坦な上面を有する焼結性接合部材と、
を備え、
前記半導体素子は複数あり、前記複数の半導体素子は、前記回路層からの高さが同一であり、一体となった前記焼結性接合部材の平坦な上面には、前記複数の半導体素子と前記絶縁基板と前記焼結性接合部材とを封止する封止樹脂と前記複数の半導体素子とが配置される、パワーモジュール。 - 前記絶縁基板の下面と接合されるベース板と、
前記半導体素子のおもて面に接合する配線部材とを備える、請求項2に記載のパワーモジュール。 - 前記焼結性接合部材の上面は、前記半導体素子の外周よりも外側へ突出する平坦部を有する、請求項1から請求項3のいずれか1項に記載のパワーモジュール。
- 前記焼結性接合部材は、側面部を有し、前記側面部は外側から内側に向かって前記焼結性接合部材の上面と前記焼結性接合部材の下面との距離が離れている、請求項4に記載のパワーモジュール。
- 前記絶縁層の下面側の前記金属層と前記ベース板とは、直接接合されている、請求項1または請求項3に記載のパワーモジュール。
- 前記絶縁層の下面側の前記金属層と前記ベース板とは、接合層を介して接合されている、請求項1または請求項3に記載のパワーモジュール。
- 前記配線部材は、ボンディングワイヤまたは板状金属部材である、請求項1、請求項3、請求項6および請求項7のいずれか1項に記載のパワーモジュール。
- 前記焼結性接合部材の熱抵抗は、前記絶縁層、前記絶縁層の上面側の前記回路層および前記絶縁層の下面側の前記金属層の熱抵抗よりも小さい、請求項1から請求項8のいずれか1項に記載のパワーモジュール。
- 前記焼結性接合部材は、銀または銅の金属粒子を含む、請求項1から請求項9のいずれか1項に記載のパワーモジュール。
- 前記絶縁基板の上面側の前記回路層の上面には、凹部が形成されており、前記凹部内には、前記焼結性接合部材が配置されている、請求項1から請求項10のいずれか1項に記載のパワーモジュール。
- 前記焼結性接合部材は、前記絶縁層の上面側の前記回路層の側面にも形成されている、請求項1から請求項11のいずれか1項に記載のパワーモジュール。
- 前記回路層は、第一回路層と第二回路層とを有し、前記金属層は、第一金属層と第二金属層とを有し、前記第一回路層の大きさは前記第二回路層の大きさよりも小さく、前記第一金属層の大きさは前記第二金属層の大きさよりも小さい、請求項1から請求項12のいずれか1項に記載のパワーモジュール。
- 請求項1から請求項13のいずれか1項に記載のパワーモジュールを有し、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、
を備えた電力変換装置。
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