JP5115595B2 - 半導体モジュールの製造方法 - Google Patents
半導体モジュールの製造方法 Download PDFInfo
- Publication number
- JP5115595B2 JP5115595B2 JP2010143059A JP2010143059A JP5115595B2 JP 5115595 B2 JP5115595 B2 JP 5115595B2 JP 2010143059 A JP2010143059 A JP 2010143059A JP 2010143059 A JP2010143059 A JP 2010143059A JP 5115595 B2 JP5115595 B2 JP 5115595B2
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- Prior art keywords
- resin mold
- mold part
- thermosetting resin
- semiconductor
- semiconductor chip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
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- Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
Description
本発明の第1実施形態にかかる冷却機構を備えた半導体モジュールについて説明する。この半導体モジュールは、例えば車両用の三相モータの駆動を行うためのインバータ等に適用される。
まず、正極リード15や負極リード16および制御端子17が一体化されたリードフレーム付きヒートスプレッダ13の表面側に、はんだ等を介してIGBTやFWDなどの半導体パワー素子が形成された半導体チップ11を実装したのち、半導体チップ11の表面に形成された半導体パワー素子のゲート等に繋がるパッドと制御端子17とをボンディングワイヤ18にて接続する。そして、半導体チップ11の表面にはんだ等を介して金属ブロック12を接合する。
金属ブロック12や負極リード16の表面にはんだ等を設置した後、その上にリードフレーム付きヒートスプレッダ14を配置し、金属ブロック12とヒートスプレッダ14とを接合する。
樹脂モールド部20のうちの熱可塑性樹脂モールド部22に対応する部分を用意する。熱可塑性樹脂モールド部22は、分離された上ピース221と下ピース222とによって構成され、それぞれを図示しない成形型によって形成している。
トランスファー成形機などの成形型50のうちの下型51を用意する。下型51には、下ピース222と対応する形状の凹部51aが形成されており、この凹部51a内に下ピース222を配置する。また、下型51の内部に、図3(b)の工程まで行った各構成部品、つまり半導体チップ11、金属ブロック12、リードフレーム付きヒートスプレッダ13、14および制御端子17の接続を終えたものを設置する。
上ピース221をセットする。図示されていないが、上ピース221と下ピース222には両者の間隔を保ち、位置合わせをする柱とそれを受ける穴が形成されている。これら柱および穴はリードフレームおよび制御端子17以外の位置に形成されている。
成形型50のうちの上型52を用意する。そして、下ピース222および各構成部品を配置した下型51の上に上ピース221を配置し、上型52を設置する。これにより、成形型50内において、熱硬化性樹脂モールド部21と対応する部分が空間として残った状態となる。
成形型50内に備えられた図示しない樹脂注入口を通じて熱硬化性樹脂、例えばエポキシ樹脂を注入する。これにより、成形型50内に残っていた空間内が熱硬化性樹脂にて埋め込まれ、熱硬化性樹脂モールド部21が形成される。この後、成形型50からの型抜きを行うことで、1つのユニット10が完成する。
図3および図4に示した工程を経て形成したユニット10を必要数用意し、各ユニット10における熱可塑性樹脂モールド部22の溝部22e内にOリング42を嵌め込む。Oリング42を溝部22eに嵌め込んだユニット10を複数個(図1中では3個)積層する。
蓋部40およびパイプ付蓋部41を用意し、パイプ付蓋部41に形成されたシール部材セット用の溝部41cにOリング42を嵌め込む。そして、積層した複数のユニット10の積層方向の一方の先端部に蓋部40を配置すると共に、他方の先端部にパイプ付蓋部41を配置する。
蓋部40と複数のユニット10およびパイプ付蓋部41を積層したものを固定具43にて固定する。これにより、図1に示した本実施形態の半導体モジュール1が完成する。
本発明の第2実施形態について説明する。本実施形態の半導体モジュール1は、第1実施形態に対してヒートスプレッダ13、14の構成を変更したものであり、その他に関しては第1実施形態と同様であるため、第1実施形態と異なっている部分についてのみ説明する。
本発明の第3実施形態について説明する。本実施形態の半導体モジュール1は、第2実施形態と同様にヒートスプレッダ13、14の構成を変更しつつ、さらに、より冷却効果を高めるための構成を採用したものであり、その他に関しては第2実施形態と同様であるため、第2実施形態と異なっている部分についてのみ説明する。
上記実施形態では、三相モータを駆動するインバータに対して半導体モジュール1を適用する場合を例に挙げて説明したが、インバータに限らず、他の装置に本発明の半導体モジュール1を適用しても良い。
10 ユニット
11 半導体チップ
13、14 ヒートスプレッダ
15 正極リード
16 負極リード
17 制御端子
21 熱硬化性樹脂モールド部
22 熱可塑性樹脂モールド部
22c 通路穴
22d 凹部
22e 溝部
30 水路
40 蓋部
41 パイプ付蓋部
41c 溝部
42 Oリング
43 固定具
60 金属膜
61 金属フィン
Claims (6)
- 表面および裏面を有し、半導体パワー素子が形成された半導体チップ(11)と、
前記半導体チップ(11)の裏面側に接続される第1ヒートスプレッダ(13)と、
前記半導体チップ(11)の表面側に接続される第2ヒートスプレッダ(14)と、
前記半導体パワー素子に電気的に接続される端子(15〜17)と、
前記半導体パワー素子に電気的に接続された前記端子(15〜17)の一部を露出させると共に、前記第1、第2ヒートスプレッダ(13、14)のうち前記半導体チップ(11)と反対側の面を露出させつつ、前記半導体チップ(11)、前記第1、第2ヒートスプレッダ(13、14)および前記端子(15〜17)を覆い、かつ、冷媒が流される冷媒通路の一部を構成する樹脂モールド部(20)と、を有し、
前記半導体チップ(11)、前記第1、第2ヒートスプレッダ(13、14)、前記端子(15〜17)を前記樹脂モールド部(20)にてモールド化したものを1つのユニット(10)として、該ユニット(10)の両端を蓋部(40、41)にて挟み込んで固定部(43)にて固定した半導体モジュールの製造方法であって、
前記樹脂モールド部(20)を形成する工程として、
前記半導体パワー素子に電気的に接続された前記端子(15〜17)の一部を露出させると共に、前記第1、第2ヒートスプレッダ(13、14)のうち前記半導体チップ(11)と反対側の面を露出させつつ、前記半導体チップ(11)、前記第1、第2ヒートスプレッダ(13、14)および前記端子(15〜17)を覆うように、熱硬化性樹脂により熱硬化性樹脂モールド部(21)を形成する工程と、
前記熱硬化性樹脂モールド部(21)の外縁部に配置され、前記冷媒通路(30)の一部を構成し、かつ、前記熱硬化性樹脂よりもガラス転位点が低い熱可塑性樹脂により熱可塑性樹脂モールド部(22)を形成する工程とを行い、
前記熱硬化性樹脂モールド部(21)を形成する工程よりも前に、前記熱可塑性樹脂モールド部(22)を形成する工程を行うことを特徴とする半導体モジュールの製造方法。 - 前記熱可塑性樹脂モールド部(22)を形成する工程では、前記熱可塑性樹脂を成形することにより、前記熱可塑性樹脂モールド部(22)を形成しておき、
前記熱硬化性樹脂モールド部(21)を形成する工程では、成形型(50)内に前記熱可塑性樹脂モールド部(22)と前記半導体チップ(11)、前記第1、第2ヒートスプレッダ(13、14)、前記端子(15〜17)を配置したのち、前記成形型(50)内に前記熱硬化性樹脂を注入し、前記熱硬化性樹脂モールド部(21)を成形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の製造方法。 - 前記熱硬化性樹脂モールド部(21)を形成する工程では、前記熱可塑性樹脂モールド部(22)を前記端子(15〜17)から離間させ、前記熱可塑性樹脂モールド部(22)と前記端子(15〜17)との間に前記熱硬化性樹脂モールド部(21)が形成されるようにすることを特徴とする請求項2に記載の半導体モジュールの製造方法。
- 前記熱硬化性樹脂としてエポキシ、フェノール、シリコーン、ウレタン樹脂を用いることを特徴とする請求項1ないし3のいずれか1つに記載の半導体モジュールの製造方法。
- 前記熱可塑性樹脂としてポリフェニレンサルファイド樹脂、ポリブチレンテレフタレート、ナイロン、ポリエチレン、ポリプロピレンを用いることを特徴とする請求項1ないし4のいずれか1つに記載の半導体モジュールの製造方法。
- 前記ユニット(10)を複数個形成し、該複数個のユニット(10)を積層することで積層体を構成すると共に、該積層体の両先端部を前記蓋部(40、41)にて覆った状態で前記固定具(43)にて固定することで前記半導体モジュールを完成させる工程を含んでいることを特徴とする請求項1ないし5のいずれか1つに記載の半導体モジュールの製造方法。
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