JP7491188B2 - 電気機器 - Google Patents
電気機器 Download PDFInfo
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- JP7491188B2 JP7491188B2 JP2020186667A JP2020186667A JP7491188B2 JP 7491188 B2 JP7491188 B2 JP 7491188B2 JP 2020186667 A JP2020186667 A JP 2020186667A JP 2020186667 A JP2020186667 A JP 2020186667A JP 7491188 B2 JP7491188 B2 JP 7491188B2
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- 229920005989 resin Polymers 0.000 claims description 53
- 239000011347 resin Substances 0.000 claims description 53
- 239000004065 semiconductor Substances 0.000 claims description 46
- 239000011248 coating agent Substances 0.000 claims description 37
- 238000000576 coating method Methods 0.000 claims description 37
- 238000005452 bending Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 description 22
- 238000006243 chemical reaction Methods 0.000 description 13
- 239000000758 substrate Substances 0.000 description 13
- 229910000679 solder Inorganic materials 0.000 description 12
- 239000003990 capacitor Substances 0.000 description 9
- 238000009499 grossing Methods 0.000 description 7
- 238000007789 sealing Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 229910000881 Cu alloy Inorganic materials 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910002601 GaN Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229910001195 gallium oxide Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052987 metal hydride Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 238000001721 transfer moulding Methods 0.000 description 1
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Description
半導体素子(30)と、
半導体素子に接続され、少なくとも一部が第1方向に延びる複数の導電部(110,120)と、
半導体素子および複数の導電部の一部を被覆する被覆樹脂(20)と、を有し、
複数の導電部それぞれは、被覆樹脂に被覆される被覆部(116,125)と、被覆樹脂から露出される露出部(117,126)と、を有し、
複数の導電部は第1方向とは異なる第2方向に並び、
複数の露出部のうちの最も近接する2つが、第2方向と、第1方向と第2方向それぞれに直交する第3方向それぞれに離間しており、
複数の被覆部のうちの最も近接する2つの間の最短離間距離が、複数の露出部のうちの最も近接する2つの間の最短離間距離よりも短くなっており、
複数の被覆部のうちの少なくとも1つに、複数の導電部のそれぞれの露出部を第3方向において離間させるための、第3方向に屈曲する屈曲部(112)が含まれており、
複数の導電部のそれぞれの露出部は、第1方向に直線状に延びている。
先ず、図1に基づき、車両の駆動システム1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、モータジェネレータ3と、電力変換装置4を備えている。
次に、図1に基づき、電力変換装置4の回路構成について説明する。電力変換装置4は、平滑コンデンサ5と、インバータ6を備えている。
次に、電気機器15の概略構成について説明する。それに当たって、以下においては互いに直交の関係にある3方向をx方向、y方向、および、z方向とする。x方向は第2方向に相当する。y方向は第1方向に相当する。z方向は第3方向に相当する。
図2~図4に示すように被覆樹脂20は電気機器15を構成する構成要素の一部を封止している。具体的に言えば、被覆樹脂20は2つの半導体チップ30、2つの第1ヒートシンク40、2つの第2ヒートシンク50、2つのターミナル60、継手部70、主端子80の一部、複数の信号端子100の一部それぞれを封止している。
半導体チップ30は、シリコンよりもバンドギャップが広いワイドバンドギャップ半導体などを材料とする半導体基板31に、縦型素子が形成されて成る。ワイドバンドギャップ半導体としては、たとえばシリコンカーバイド、窒化ガリウム、酸化ガリウム、ダイヤモンドがある。半導体基板31はz方向に厚さの薄い扁平形状を成している。縦型素子はz方向に主電流が流れるように構成されている。本実施形態の縦型素子は1つのアームを構成するIGBT11およびFWD12である。半導体チップ30は、半導体素子に相当する。
第1ヒートシンク40は、図4に示すようにz方向において半導体チップ30のコレクタ電極32Cに対向配置されている。第1ヒートシンク40は、はんだ90を介して、コレクタ電極32Cに電気的および機械的に接続されている。第1ヒートシンク40は、半導体チップ30側の面である第1対向面40aと、第1対向面40aとの裏側の第1裏面40bを有している。
第2ヒートシンク50は、図4に示すようにz方向においてターミナル60に対向配置されている。第2ヒートシンク50は、はんだ90を介して、ターミナル60に電気的および機械的に接続されている。第2ヒートシンク50は、半導体チップ30側の面である第2対向面50aと、第2対向面50aとの裏側の第2裏面50bを有している。
ターミナル60は、z方向において半導体チップ30と第2ヒートシンク50との間に介在し、エミッタ電極32Eと第2ヒートシンク50とを電気的に中継している。ターミナル60は、エミッタ電極32Eと第2ヒートシンク50との電気伝導、熱伝導経路の途中に位置する。ターミナル60は、Cu、Cu合金などの金属材料を用いて形成された柱状体である。ターミナル60は、表面に、めっき膜を備えてもよい。ターミナル60は、金属ブロック体、中継部材と称されることがある。
第1継手部71と第2継手部72は上アーム9Hと下アーム9Lを電気的に接続する役割を担っている。図4に示すように第1継手部71と第2継手部72とがはんだ90によって接合されている。第3継手部73は、下アーム9Lと後述の負極端子80Nとを電気的に接続する役割を担っている。
主端子80は半導体チップ30の電極と電気的に接続される端子である。主端子80は、正極端子80Pと、負極端子80Nと、出力端子80Sそれぞれを有する。正極端子80Pおよび負極端子80Nは、電源端子である。正極端子80Pは、P端子、高電位電源端子と称されることがある。負極端子80Nは、N端子、低電位電源端子と称されることがある。
図3に示すように複数の上段端子110はx方向に離間して並んでいる。複数の上段端子110それぞれの形状は同等になっている。
図3に示すように複数の下段端子120はx方向に離間して並んでいる。複数の下段端子120それぞれの形状は同等になっている。
図7に示すように複数の第1上段接続部111がx方向に離間して並んでいる。複数の第1下段接続部121がx方向に離間して並んでいる。第1上段接続部111と第1下段接続部121の配置に関して言えば、第1上段接続部111と第1下段接続部121が交互にx方向に離間して並んでいる。なお、図7においては図2に示すVII-VII線に沿う断面を簡略化して示している。
図8に示すように複数の上段露出基部114aそれぞれが下段露出基部123aそれぞれよりも第2主面20b側に設けられている。言い換えれば複数の下段露出基部123aそれぞれが、上段露出基部114aそれぞれよりも第1主面20a側に設けられている。下段露出基部123aそれぞれはx方向に隣合う上段露出基部114aの間に設けられている。
上記したように第1上段接続部111と第1下段接続部121が交互にx方向に離間して並んでいる。上段露出基部114aと下段露出基部123aが交互にx方向とz方向それぞれに離間して並んでいる。
図8および図9に示すように、被覆樹脂20における上段露出基部114aと下段露出基部123aそれぞれの露出する露出面20cに、z方向に凹む溝部21が形成されている。図8に示すように溝部21は隣接する端子の間に位置するように露出面20cに形成されている。なお、図9においては図8に示すIX-IX線に沿う断面を簡略化して示している。溝部21は凹凸部に相当する。
これまでに説明したように被覆樹脂20に被覆された第1上段接続部111と第1下段接続部121が交互にx方向に離間して並んでいる。被覆樹脂20から露出した上段露出基部114aと下段露出基部123aが交互にx方向とz方向それぞれに離間して並んでいる。
これまでに説明した実施形態では隣接する端子の間の露出面20cに溝部21が形成された形態について説明した。しかしながら露出面20cに溝部21が形成されていなくともよい。図10に示すように露出面20cから突起する突起部22が形成されていてもよい。その場合、突起部22には隣接する2つの端子の並ぶ方向に離間して並ぶ第1突起面22aおよび第2突起面22bとこれらを連結する露出面20cから離間した側に位置する第3突起面22cが含まれる。そのために隣接する2つの端子の間の露出面20cに沿う沿面距離が長くなる。隣接する2つの端子間の絶縁性が高まりやすくなる。なお、突起部22は凹凸部に相当する。
これまでに説明した実施形態では複数の上段端子110および下段端子120それぞれの形状は同等になっている形態について説明した。しかしながら図11に示すように複数の上段端子110それぞれのy方向の長さが異なっていても良い。複数の下段端子120それぞれのy方向の長さが異なっていても良い。上段端子110と下段端子120を含むすべての端子のy方向の長さが異なっていても良い。
これまでに説明した実施形態では上段露出基部114aと下段露出基部123aが第1主面20a側と第2主面20b側に互い違いに千鳥状に並んでいる形態について説明した。しかしながら、第1離間距離aが第2離間距離bよりも短くなっていれば、上段露出基部114aと下段露出基部123aは千鳥状に並んでいなくても良い。例えば図13に示すように上段露出基部114aと下段露出基部123aがz方向に3段に並ぶように並んでいても良い。
これまでに説明したように第1上段接続部111と第1下段接続部121が交互にx方向に離間して並んでいる。しかしながら第1離間距離aが第2離間距離bよりも短くなった状態であれば、図14に示すように第1上段接続部111と第1下段接続部121とがx方向とz方向に並んでいても良い。その場合であっても被覆樹脂20の体格の増大が抑制されやすくなる。電気機器15が小型化されやすくなっている。
Claims (2)
- 半導体素子(30)と、
前記半導体素子に接続され、少なくとも一部が第1方向に延びる複数の導電部(110,120)と、
前記半導体素子および複数の前記導電部の一部を被覆する被覆樹脂(20)と、を有し、
複数の前記導電部それぞれは、前記被覆樹脂に被覆される被覆部(116,125)と、前記被覆樹脂から露出される露出部(117,126)と、を有し、
複数の前記導電部は前記第1方向とは異なる第2方向に並び、
複数の前記露出部のうちの最も近接する2つが、前記第2方向と、前記第1方向と前記第2方向それぞれに直交する第3方向それぞれに離間しており、
複数の前記被覆部のうちの最も近接する2つの間の最短離間距離が、複数の前記露出部のうちの最も近接する2つの間の最短離間距離よりも短くなっており、
複数の前記被覆部のうちの少なくとも1つに、複数の前記導電部のそれぞれの前記露出部を前記第3方向において離間させるための、前記第3方向に屈曲する屈曲部(112)が含まれており、
複数の前記導電部のそれぞれの前記露出部は、前記第1方向に直線状に延びている電気機器。 - 前記被覆樹脂における複数の前記露出部の露出される側の露出面(20c)のうちの隣接する2つの前記露出部の間に凹凸部(21,22)が形成されている請求項1に記載の電気機器。
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