JP7268563B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP7268563B2 JP7268563B2 JP2019178858A JP2019178858A JP7268563B2 JP 7268563 B2 JP7268563 B2 JP 7268563B2 JP 2019178858 A JP2019178858 A JP 2019178858A JP 2019178858 A JP2019178858 A JP 2019178858A JP 7268563 B2 JP7268563 B2 JP 7268563B2
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- semiconductor element
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- H01L2924/13—Discrete devices, e.g. 3 terminal devices
- H01L2924/1304—Transistor
- H01L2924/1306—Field-effect transistor [FET]
- H01L2924/13091—Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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- H—ELECTRICITY
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- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- H—ELECTRICITY
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- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
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Description
ワイドバンドギャップ半導体を基材とし、第1主面に形成された第1主電極(41)と、第1主面とは反対の第2主面に形成された第2主電極(42)と、を有する半導体素子(40)と、
半導体素子を挟むように配置された配線部材(50)であって、第1主面側に配置され、第1主電極と電気的に接続された第1配線部材(51)、および、第2主面側に配置され、第2主電極と電気的に接続された第2配線部材(52、53)と、
半導体素子と配線部材とを一体的に封止する封止樹脂体(30)と、
封止樹脂体内において半導体素子とともに配線部材により挟まれ、第1配線部材との第1接合部(71)と、第2配線部材との第2接合部(72)と、を有する少なくともひとつの絶縁体(70)と、を備え、
絶縁体は、半導体基材に複数のダイオードが形成され、順方向となる向きが互いに逆方向となるように複数のダイオードが直列接続された非導通素子である。
開示の他のひとつである半導体装置は、
ワイドバンドギャップ半導体を基材とし、第1主面に形成された第1主電極(41)と、第1主面とは反対の第2主面に形成された第2主電極(42)と、を有する半導体素子(40)と、
半導体素子を挟むように配置された配線部材(50)であって、第1主面側に配置され、第1主電極と電気的に接続された第1配線部材(51)、および、第2主面側に配置され、第2主電極と電気的に接続された第2配線部材(52、53)と、
半導体素子と配線部材とを一体的に封止する封止樹脂体(30)と、
封止樹脂体内において半導体素子とともに配線部材により挟まれ、第1配線部材との第1接合部(71)と、第2配線部材との第2接合部(72)と、を有する少なくともひとつの絶縁体(70,70A)と、を備え、
半導体素子と絶縁体とが、配線部材の長手方向に並んで配置されている。
本実施形態に係る半導体装置は、電力変換装置に適用される。電力変換装置は、たとえば車両の駆動システムに適用される。電力変換装置は、たとえば燃料電池車(FCV)、電気自動車(EV)、ハイブリッド自動車(HV)などの車両に適用可能である。
先ず、車両の駆動システムの概略構成について説明する。図1に示すように、車両の駆動システム1は、直流電源2と、モータ3と、電力変換装置4を備えている。
次に、電力変換装置4について説明する。図1に示すように、電力変換装置4は、コンバータ5と、平滑コンデンサ6と、インバータ7を備えている。コンバータ5およびインバータ7は、電力変換部である。コンバータ5は、直流電圧を異なる値の直流電圧に変換するDC-DC変換部である。
次に、コンバータ5について説明する。図1に示すように、コンバータ5は、レグ10と、リアクトル11を備えている。コンバータ5は、4相分のレグ10およびリアクトル11を備えている。図1において、レグ10に付加したカッコ内の符号は、U相、V相、W相、およびX相のいずれであるかを示している。本実施形態のコンバータ5は、降圧機能を有さず、昇圧機能を有している。
次に、コンバータ5を構成する半導体装置について説明する。図2~図5は、コンバータ5の一相分のレグ10のうち、上アームを構成する半導体装置を示している。図5は、図2に対して封止樹脂体を省略した図である。以下では、半導体素子の板厚方向をZ方向、Z方向に直交する一方向、具体的には配線部材の長手方向をX方向と示す。また、Z方向およびX方向の両方向に直交する方向をY方向と示す。特に断わりのない限り、Z方向から平面視した形状、換言すればX方向およびY方向により規定されるXY面に沿う形状を平面形状とする。また、Z方向からの平面視を単に平面視と示す。図2~図5に示すように、半導体装置20は、封止樹脂体30と、半導体素子40と、配線部材50と、主端子60、61と、絶縁体70を備えている。
次に、半導体装置20の製造方法について説明する。
SiCなどのワイドバンドギャップ半導体は、Siに較べて、絶縁破壊電界強度が高い、飽和速度が速い、熱伝導率が高いなどの特性を有している。このため、同等性能とするとSiよりも素子サイズを小さくすることができる。一般的に、素子サイズを小さくすると放熱面積が減るため発熱に対して厳しくなる。ワイドバンドギャップ半導体はSiよりも熱伝導率が高く、熱定格が高い特性を有するため、素子サイズを小さくすることができる。素子サイズを小さくすることでコストを低減することもできる。
この実施形態は、先行する実施形態を基礎的形態とする変形例であり、先行実施形態の記載を援用できる。先行実施形態では、平面視において絶縁体70の面積を半導体素子40の面積とほぼ等しくした。また、絶縁体70をひとつのみ備える例を示した。しかしながら、この例に限定されるものではない。
本実施形態では、平面視において、絶縁体70のほうが半導体素子40よりも大きいため、先行実施形態に較べて絶縁体70に作用する応力が増す。これにより、半導体素子40に作用する応力を、さらに低減することができる。よって、半導体装置20の信頼性をさらに高めることができる。
この実施形態は、先行する実施形態を基礎的形態とする変形例であり、先行実施形態の記載を援用できる。先行実施形態では、非導通素子13を絶縁体70とした。絶縁体は、これに限定されるものではない。
本実施形態のように、基材の性能により絶縁機能を果たす絶縁体70Aを採用してもよい。この絶縁体70Aを備える半導体装置20も、絶縁体70を備える半導体装置20と同等の効果を奏することができる。好ましくは、絶縁体の基材を構成する材料として、半導体素子40を構成する基材と線膨張係数が近い材料を用いるとよい。
この明細書および図面等における開示は、例示された実施形態に制限されない。開示は、例示された実施形態と、それらに基づく当業者による変形態様を包含する。たとえば、開示は、実施形態において示された部品および/または要素の組み合わせに限定されない。開示は、多様な組み合わせによって実施可能である。開示は、実施形態に追加可能な追加的な部分をもつことができる。開示は、実施形態の部品および/または要素が省略されたものを包含する。開示は、ひとつの実施形態と他の実施形態との間における部品および/または要素の置き換え、または組み合わせを包含する。開示される技術的範囲は、実施形態の記載に限定されない。開示されるいくつかの技術的範囲は、請求の範囲の記載によって示され、さらに請求の範囲の記載と均等の意味および範囲内でのすべての変更を含むものと解されるべきである。
Claims (7)
- ワイドバンドギャップ半導体を基材とし、第1主面に形成された第1主電極(41)と、前記第1主面とは反対の第2主面に形成された第2主電極(42)と、を有する半導体素子(40)と、
前記半導体素子を挟むように配置された配線部材(50)であって、前記第1主面側に配置され、前記第1主電極と電気的に接続された第1配線部材(51)、および、前記第2主面側に配置され、前記第2主電極と電気的に接続された第2配線部材(52、53)と、
前記半導体素子と前記配線部材とを一体的に封止する封止樹脂体(30)と、
前記封止樹脂体内において前記半導体素子とともに前記配線部材により挟まれ、前記第1配線部材との第1接合部(71)と、前記第2配線部材との第2接合部(72)と、を有する少なくともひとつの絶縁体(70)と、を備え、
前記絶縁体は、半導体基材に複数のダイオードが形成され、順方向となる向きが互いに逆方向となるように前記複数のダイオードが直列接続された非導通素子である半導体装置。 - 前記半導体素子と前記絶縁体とが、前記配線部材の長手方向に並んで配置されている請求項1に記載の半導体装置。
- ワイドバンドギャップ半導体を基材とし、第1主面に形成された第1主電極(41)と、前記第1主面とは反対の第2主面に形成された第2主電極(42)と、を有する半導体素子(40)と、
前記半導体素子を挟むように配置された配線部材(50)であって、前記第1主面側に配置され、前記第1主電極と電気的に接続された第1配線部材(51)、および、前記第2主面側に配置され、前記第2主電極と電気的に接続された第2配線部材(52、53)と、
前記半導体素子と前記配線部材とを一体的に封止する封止樹脂体(30)と、
前記封止樹脂体内において前記半導体素子とともに前記配線部材により挟まれ、前記第1配線部材との第1接合部(71)と、前記第2配線部材との第2接合部(72)と、を有する少なくともひとつの絶縁体(70,70A)と、を備え、
前記半導体素子と前記絶縁体とが、前記配線部材の長手方向に並んで配置されている半導体装置。 - 前記長手方向における前記配線部材の仮想的な中心線に対し、前記長手方向の一方の領域に前記半導体素子が配置され、他方の領域に前記絶縁体が配置されている請求項2または請求項3に記載の半導体装置。
- 前記半導体素子の板厚方向からの平面視において、前記絶縁体の面積が前記半導体素子の面積よりも大きい請求項1~4いずれか1項に記載の半導体装置。
- 前記絶縁体をひとつのみ備え、
前記ひとつの絶縁体の面積が、前記半導体素子の面積よりも大きい請求項5に記載の半導体装置。 - 前記絶縁体を複数備え、
前記複数の絶縁体の総面積が、前記半導体素子の面積よりも大きい請求項5に記載の半導体装置。
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