JP2011222805A - パワー半導体モジュール - Google Patents

パワー半導体モジュール Download PDF

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Publication number
JP2011222805A
JP2011222805A JP2010091291A JP2010091291A JP2011222805A JP 2011222805 A JP2011222805 A JP 2011222805A JP 2010091291 A JP2010091291 A JP 2010091291A JP 2010091291 A JP2010091291 A JP 2010091291A JP 2011222805 A JP2011222805 A JP 2011222805A
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Japan
Prior art keywords
power semiconductor
insulating substrate
semiconductor module
solder
low dielectric
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Granted
Application number
JP2010091291A
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English (en)
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JP5212417B2 (ja
JP2011222805A5 (ja
Inventor
Yasuhito Kawaguchi
安人 川口
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2010091291A priority Critical patent/JP5212417B2/ja
Priority to US12/910,231 priority patent/US8558361B2/en
Priority to DE102011005690.4A priority patent/DE102011005690B4/de
Priority to CN2011100736492A priority patent/CN102214622B/zh
Publication of JP2011222805A publication Critical patent/JP2011222805A/ja
Publication of JP2011222805A5 publication Critical patent/JP2011222805A5/ja
Application granted granted Critical
Publication of JP5212417B2 publication Critical patent/JP5212417B2/ja
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    • H01L2924/10Details of semiconductor or other solid state devices to be connected
    • H01L2924/11Device type
    • H01L2924/13Discrete devices, e.g. 3 terminal devices
    • H01L2924/1304Transistor
    • H01L2924/1305Bipolar Junction Transistor [BJT]
    • H01L2924/13055Insulated gate bipolar transistor [IGBT]
    • HELECTRICITY
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    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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    • H01L2924/161Cap
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    • HELECTRICITY
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    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/15Details of package parts other than the semiconductor or other solid state devices to be connected
    • H01L2924/181Encapsulation

Abstract

【課題】絶縁不良を低減することができるパワー半導体モジュールを得る。
【解決手段】パワー半導体回路基板3は上面電極14と下面電極15を有する。パワー半導体回路基板3の下面電極15は、半田16を介して放熱板1に接合されている。パワー半導体回路基板3の上面電極14上に半田17を介して半導体チップ18が接合されている。低誘電率膜19が半田16と下面電極15の側面を覆っている。低誘電率膜20が半田17と半導体チップ18の側面を覆っている。ケース9は、放熱板1上に設けられ、パワー半導体回路基板3及び半導体チップ18を囲う。ケース9内に充填されたシリコンゲル11が、パワー半導体回路基板3、半導体チップ18、及び低誘電率膜19,20を覆っている。
【選択図】図4

Description

本発明は、両面電極付絶縁基板を備えるパワー半導体モジュールに関し、特に絶縁不良を低減することができるパワー半導体モジュールに関する。
近年、モータなどの電気機器を制御する電力変換装置などにパワー半導体モジュールが用いられている。パワー半導体モジュールでは、放熱板上に半田により両面電極付絶縁基板が接合され、絶縁基板上に半田により半導体チップが接合されている。そして、ケースが絶縁基板及び半導体チップを内包し、ケース内にシリコンゲルが充填されている(例えば、特許文献1参照)。
特開2002−76190号公報
モジュール周辺や通電時の温度変化により、半田からシリコンゲル中に気泡が発生する場合がある。この気泡により絶縁不良が発生する場合がある。特に両面電極付絶縁基板の周辺の気泡は、絶縁不良に直結する。
本発明は、上述のような課題を解決するためになされたもので、その目的は絶縁不良を低減することができるパワー半導体モジュールを得るものである。
本発明は、放熱板と、上面電極と下面電極を有し、前記下面電極が第1の半田を介して前記放熱板に接合された絶縁基板と、前記上面電極上に第2の半田を介して接合された半導体チップと、前記第1の半田と前記下面電極の側面を覆う第1の低誘電率膜と、前記第2の半田と前記半導体チップの側面を覆う第2の低誘電率膜と、前記放熱板上に設けられ、前記絶縁基板及び前記半導体チップを囲うケースと、前記ケース内に充填され、前記絶縁基板、前記半導体チップ、及び前記第1及び第2の低誘電率膜を覆う柔軟絶縁物とを有することを特徴とするパワー半導体モジュールである。
本発明により、絶縁不良を低減することができる。
実施の形態1に係るパワー半導体モジュールを示す断面図である。 実施の形態1に係るパワー半導体モジュールを示す上面図である。 図2に示すパワー半導体モジュールにおける1つの回路ブロックの等価回路である。 実施の形態1に係るパワー半導体モジュールを示す拡大断面図である。 実施の形態2に係るパワー半導体モジュールを示す拡大断面図である。 実施の形態3に係るパワー半導体モジュールを示す拡大断面図である。 実施の形態4に係るパワー半導体モジュールを示す拡大断面図である。 実施の形態5に係るパワー半導体モジュールを示す拡大断面図である。
本発明の実施の形態に係るパワー半導体モジュールについて図面を参照して説明する。同じ構成要素には同じ符号を付し、説明の繰り返しを省略する場合がある。
実施の形態1.
図1は、実施の形態1に係るパワー半導体モジュールを示す断面図であり、図2はその上面図である。このパワー半導体モジュールは、複数の絶縁ゲート型バイポーラトランジスタ(IGBT)を並列接続し、共通のコレクタ端子、エミッタ端子、ゲート端子を備えることで高耐圧・大電流特性を得るように構成された回路ブロックを複数内蔵している。図3は、図2に示すパワー半導体モジュールにおける1つの回路ブロックの等価回路である。
金属製の放熱板1上に、駆動回路基板2、パワー半導体回路基板3、及び中継回路基板4が取り付けられている。これらの回路基板は、セラミックスなどの絶縁基板の両面に銅又はアルミ等からなる導電パターンが設けられたものである。パワー半導体回路基板3上にIGBT5及びフリーホイールダイオード6が接合されている。駆動回路基板2上にチップ抵抗7が接合されている。
IGBT5のエミッタ及びフリーホイールダイオード6のアノードは、Alワイヤ8により中継回路基板の導電パターンに接続されている。IGBT5のゲートは、Alワイヤ8により駆動回路基板2の導電パターンに接続されている。IGBT5のコレクタとフリーホイールダイオード6のカソードは、パワー半導体回路基板3の導電パターンを介して互いに接続されている。
駆動回路基板2、パワー半導体回路基板3及び中継回路基板4を囲うように放熱板1上に樹脂性のケース9が設けられ、ケース9の上部にふた10が配置されている。ケース9内には、気密性と絶縁を保つためシリコンゲル11が充填されている。それぞれの回路基板は電極端子接合領域12を備える。この電極端子接合領域12には、図示していないが、装置外部との電気的接続を実現する電極端子が取り付けられている。ここではパワー半導体回路基板3と中継回路基板4を異なる絶縁基板に分離しているが、同じ1つの絶縁基板上に導電パターンの形成領域を分けて両者を構成してもよい。
図4は、実施の形態1に係るパワー半導体モジュールを示す拡大断面図である。絶縁基板13は上面電極14と下面電極15を有する。絶縁基板13の下面電極15は、半田16を介して放熱板1に接合されている。絶縁基板13の上面電極14上に半田17を介してSi製の半導体チップ18が接合されている。半導体チップ18にAlワイヤ8がボンディングされている。なお、絶縁基板13は図1ないし図3のパワー半導体回路基板3に相当し、半導体チップ18は図1ないし図3のIGBT5又はフリーホイールダイオード6に相当する。
低誘電率膜19が半田16と下面電極15の側面を覆っている。低誘電率膜20が半田17と半導体チップ18の側面を覆っている。低誘電率膜19,20は、シリコンゴム、ポリイミド、及びエポキシ樹脂の何れかである。特に、低誘電率膜19,20としてシリコンゴムを用いればアセンブリが容易となり、ポリイミドを用いれば耐熱性が向上し、エポキシ樹脂を用いればヒートサイクル性が向上する。ケース9内に充填されたシリコンゲル11(柔軟絶縁物)が、絶縁基板13、半導体チップ18、及び低誘電率膜19,20を覆っている。
以上説明したように、本実施の形態では、低誘電率膜19が半田16と下面電極15の側面を覆い、低誘電率膜20が半田17と半導体チップ18の側面を覆っている。これにより、第1及び半田17からの気泡発生を抑制することができる。よって、絶縁不良を低減することができ、製品の長寿命化が可能となる。
実施の形態2.
図5は、実施の形態2に係るパワー半導体モジュールを示す拡大断面図である。低誘電率膜19は、絶縁基板13より下側において、放熱板1の上面全面を覆っている。その他の構成は実施の形態1と同様である。これにより、半田16からの気泡発生を実施の形態1よりも確実に抑制することができる。
実施の形態3.
図6は、実施の形態3に係るパワー半導体モジュールを示す拡大断面図である。低誘電率膜19は設けられていないが、絶縁基板13は下面の外周部から下方に突出した凸部21を更に有する。その他の構成は実施の形態1と同様である。これにより、半田16から発生した気泡は、凸部21により絶縁基板13の下面側に停留する。従って、絶縁不良を低減することができる。
実施の形態4.
図7は、実施の形態4に係るパワー半導体モジュールを示す拡大断面図である。ケース9の内壁に仕切り22が設けられている。この仕切り22は、放熱板1とケース9との接合部23と絶縁基板13の上面との間に配置されている。その他の構成は実施の形態1と同様である。
接合部23から発生する気泡は、仕切り22によりケース9側に停留し、絶縁基板13の上面には移動しない。従って、絶縁不良を更に低減することができる。
接合部23から絶縁基板13の上面までの距離は、半田16,17から絶縁基板13の上面までの距離に比べて長い。従って、接合部23から発生する気泡が絶縁不良を招く可能性は低い。ただし、更に高い信頼性が求められる場合に本実施の形態は有効である。
なお、実施の形態4の構成は、実施の形態1に対してだけではなく、実施の形態2又は3にも適用できる。
実施の形態5.
図8は、実施の形態5に係るパワー半導体モジュールを示す拡大断面図である。実施の形態1ないし4では、シリコンゲル11はAlワイヤ8を全て覆っていた。これに対し、実施の形態5では、シリコンゲル11の高さを半導体チップ18の上面から数mm程度までにする。これにより、Alワイヤ8の一部はシリコンゲル11から露出する。その他の構成は実施の形態1と同様である。
仮に低誘電率膜19,20の形成不良等により半田16,17から気泡が発生しても、その気泡はシリコンゲル11の上面に容易に達することができ、気中に放出される。従って、絶縁不良を更に低減することができる。
なお、実施の形態5の構成は、実施の形態1に対してだけではなく、実施の形態2ないし4の何れかにも適用できる。
1 放熱板
8 Alワイヤ(ワイヤ)
9 ケース
11 シリコンゲル(絶縁物)
13 絶縁基板
14 上面電極
15 下面電極
16 半田(第1の半田)
17 半田(第2の半田)
18 半導体チップ
19 低誘電率膜(第1の低誘電率膜)
20 低誘電率膜(第2の低誘電率膜)
21 凸部
22 仕切り
23 接合部

Claims (6)

  1. 放熱板と、
    上面電極と下面電極を有し、前記下面電極が第1の半田を介して前記放熱板に接合された絶縁基板と、
    前記上面電極上に第2の半田を介して接合された半導体チップと、
    前記第1の半田と前記下面電極の側面を覆う第1の低誘電率膜と、
    前記第2の半田と前記半導体チップの側面を覆う第2の低誘電率膜と、
    前記放熱板上に設けられ、前記絶縁基板及び前記半導体チップを囲うケースと、
    前記ケース内に充填され、前記絶縁基板、前記半導体チップ、及び前記第1及び第2の低誘電率膜を覆う絶縁物とを有することを特徴とするパワー半導体モジュール。
  2. 前記低誘電率膜は、シリコンゴム、ポリイミド、及びエポキシ樹脂の何れかであることを特徴とする請求項1に記載のパワー半導体モジュール。
  3. 前記第1の低誘電率膜は、前記絶縁基板より下側において、前記放熱板の上面全面を覆っていることを特徴とする請求項1又は2に記載のパワー半導体モジュール。
  4. 前記絶縁基板は、下面の外周部から下方に突出した凸部を更に有することを特徴とする請求項1又は2に記載のパワー半導体モジュール。
  5. 前記放熱板と前記ケースとの接合部と前記絶縁基板の上面との間に配置された仕切りを更に備えることを特徴とする請求項1ないし4の何れか1項に記載のパワー半導体モジュール。
  6. 前記半導体チップにボンディングされたワイヤを更に備え、
    前記ワイヤの一部は、前記絶縁物から露出していることを特徴とする請求項1ないし5の何れか1項に記載のパワー半導体モジュール。
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US8558361B2 (en) 2013-10-15
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