JP2020036486A - Power conversion device - Google Patents

Power conversion device Download PDF

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JP2020036486A
JP2020036486A JP2018162336A JP2018162336A JP2020036486A JP 2020036486 A JP2020036486 A JP 2020036486A JP 2018162336 A JP2018162336 A JP 2018162336A JP 2018162336 A JP2018162336 A JP 2018162336A JP 2020036486 A JP2020036486 A JP 2020036486A
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filter capacitor
axis
semiconductor elements
power conversion
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JP7277094B2 (en
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瞭 蟹澤
Ryo Kanisawa
瞭 蟹澤
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Toyo Electric Manufacturing Ltd
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Abstract

To maintain an insulated state between semiconductor elements and a filter capacitor to fix the filter capacitor by counterposing the filter capacitor at predetermined intervals from a plurality of semiconductor elements in an X-axis plus direction.SOLUTION: A juxtaposing direction of a plurality of semiconductor elements 21, 22, 23 is considered as a Y-axis direction, a direction for going away from the semiconductor elements of X-axis directions orthogonal to the Y-axis direction is considered as an X-axis plus direction, a plurality of fixing frames 51, 52, 53, 54 extending in the X-axis plus direction are supported at one and the other ends of a housing 4 in the Y-axis direction so as to be arranged outside a filter capacitor 3, a fixing plate 6 whose length in the Y-axis direction is longer than the filter capacitor is fastened to an end surface 31 of the filter capacitor in the X-axis plus direction, and the fixing plate is fastened to the end of the fixing frame in the X-axis plus direction.SELECTED DRAWING: Figure 1

Description

本発明は、電力変換回路を構成する、並設された複数の半導体素子と、電力変換回路の直流端子に接続されて直流電流を平滑するフィルタコンデンサと、半導体素子を収納する筐体とを備え、半導体素子の並設方向をＹ軸方向とし、Ｙ軸方向と直交するＸ軸方向の内、半導体素子から遠ざかる方向をＸ軸プラス方向として、フィルタコンデンサが、複数の半導体素子からＸ軸プラス方向に所定の間隔を存して対置して固定される電力変換装置に関する。   The present invention includes a plurality of semiconductor elements arranged in parallel, constituting a power conversion circuit, a filter capacitor connected to a DC terminal of the power conversion circuit for smoothing a DC current, and a housing for housing the semiconductor element. The direction in which the semiconductor elements are juxtaposed is the Y-axis direction, and the direction away from the semiconductor element is the X-axis plus direction in the X-axis direction orthogonal to the Y-axis direction. And a power conversion device fixed at a predetermined interval.

従来、この種の電力変換装置として、半導体素子、フィルタコンデンサ、半導体素子を冷却する冷却手段等が固定されて一体化され、筐体内部に収納されるものが知られている（例えば、特許文献１参照）。   Conventionally, as this type of power conversion device, a device in which a semiconductor element, a filter capacitor, a cooling unit for cooling the semiconductor element, and the like are fixed and integrated, and housed in a housing is known (for example, Patent Document 1). 1).

しかしながら、特許文献１には、半導体素子とフィルタコンデンサとを固定し、一体化するための具体的な技術手段は記載されていない。一体化については、例えば、フィルタコンデンサを半導体素子からＸ軸プラス方向に所定間隔を存して対置させ、フィルタコンデンサ側からボルトを半導体素子に螺入して固定することが考えられる。しかしながら、この場合、フィルタコンデンサと半導体素子との間がボルトによって絶縁破壊され、絶縁状態を保てなくなる虞がある。   However, Patent Document 1 does not disclose specific technical means for fixing and integrating the semiconductor element and the filter capacitor. As for the integration, for example, it is conceivable that the filter capacitor is opposed to the semiconductor element at a predetermined distance in the X-axis plus direction, and a bolt is screwed into the semiconductor element from the filter capacitor side and fixed. However, in this case, the insulation between the filter capacitor and the semiconductor element may be broken by the bolt, and the insulation state may not be maintained.

特開２０１０−２８４０４９号公報JP 2010-284049 A

本発明は、以上の点に鑑み、半導体素子とフィルタコンデンサとの間の絶縁状態を保って、フィルタコンデンサが、複数の半導体素子からＸ軸プラス方向に所定の間隔を存して対置して固定される電力変換装置を提供することをその課題としている。   In view of the above, the present invention maintains the insulating state between the semiconductor element and the filter capacitor, and fixes the filter capacitor so as to face the plurality of semiconductor elements at a predetermined interval in the positive X-axis direction. It is an object of the present invention to provide a power conversion device that is used.

上記課題を解決するために、本発明は、電力変換回路を構成する、並設された複数の半導体素子と、電力変換回路の直流端子に接続されて直流電流を平滑するフィルタコンデンサと、半導体素子を収納する筐体とを備え、半導体素子の並設方向をＹ軸方向とし、Ｙ軸方向と直交するＸ軸方向の内、半導体素子から遠ざかる方向をＸ軸プラス方向として、フィルタコンデンサが、複数の半導体素子からＸ軸プラス方向に所定の間隔を存して対置して固定される電力変換装置であって、Ｘ軸プラス方向に延びる複数の固定フレームが、フィルタコンデンサの外側に配置されるように筐体のＹ軸方向の一方及び他方の端部に支持され、Ｙ軸方向の長さがフィルタコンデンサよりも長い固定プレートが、フィルタコンデンサのＸ軸プラス方向の端面に締結され、固定フレームのＸ軸プラス方向の端部に固定プレートが締結されて、フィルタコンデンサが、複数の半導体素子からＸ軸プラス方向に所定の間隔を存して対置して固定されることを特徴とする。   In order to solve the above problems, the present invention provides a power conversion circuit, a plurality of semiconductor elements arranged in parallel, a filter capacitor connected to a DC terminal of the power conversion circuit for smoothing a DC current, and a semiconductor element. A housing for housing the semiconductor element, wherein the direction in which the semiconductor elements are arranged is the Y-axis direction, and the direction away from the semiconductor element is the X-axis plus direction in the X-axis direction orthogonal to the Y-axis direction. A power conversion device fixedly opposed to the semiconductor device at a predetermined interval in the X-axis plus direction, wherein a plurality of fixed frames extending in the X-axis plus direction are arranged outside the filter capacitor. Is fixed to one end and the other end in the Y-axis direction of the housing, and a fixed plate whose length in the Y-axis direction is longer than the filter capacitor is attached to the end surface of the filter capacitor in the X-axis plus direction. The fixed plate is fastened to the end of the fixed frame in the X-axis plus direction, and the filter capacitor is fixed to be opposed to the plurality of semiconductor elements at a predetermined interval in the X-axis plus direction. Features.

本発明によれば、筐体に支持された固定フレームと、フィルタコンデンサに締結した固定プレートとの締結によって、半導体素子とフィルタコンデンサとをボルトで直接連結することなく、フィルタコンデンサを複数の半導体素子からＸ軸プラス方向に所定間隔を存して対置させて固定できる。このため、フィルタコンデンサと半導体素子との間の絶縁状態が保たれる。   According to the present invention, the filter capacitor is connected to the plurality of semiconductor elements without directly connecting the semiconductor element and the filter capacitor by bolts by fastening the fixed frame supported by the housing and the fixed plate fastened to the filter capacitor. Can be fixed opposite to each other at a predetermined interval in the X-axis plus direction. Therefore, an insulating state between the filter capacitor and the semiconductor element is maintained.

本発明の電力変換装置の一実施形態を示した分解斜視図。FIG. 1 is an exploded perspective view showing an embodiment of a power converter according to the present invention. 図１に示した電力変換装置の斜視図。FIG. 2 is a perspective view of the power converter illustrated in FIG. 1.

図１及び図２を参照して、電力変換装置１は、電力変換回路を構成する、並設された３つの半導体素子２１，２２，２３と、電力変換回路の直流端子に接続されて直流電流を平滑するフィルタコンデンサ３と、半導体素子２１，２２，２３を収納する筐体４とを備えている。半導体素子２１，２２，２３には、例えば、Ｕ，Ｖ，Ｗの３相分のＩＧＢＴ（絶縁ゲート型バイポーラトランジスタ）を一般的に採用できる。電力変換装置１では、半導体素子２１，２２，２３の並設方向をＹ軸方向とし、Ｙ軸方向と直交するＸ軸方向の内、半導体素子２１，２２，２３から遠ざかる方向をＸ軸プラス（＋）方向として、フィルタコンデンサ３が、半導体素子２１，２２，２３からＸ軸プラス方向に所定の間隔を存して対置して固定される。筐体４は、半導体素子２１，２２，２３を冷却するための冷却フィン等を有する半導体冷却ユニットを収納する本体部４１と、フィルタコンデンサ３を固定するためのフィルタコンデンサ固定部４２とを備えている。本体部４１はＸ軸プラス方向に開放され、半導体素子２１，２２，２３が本体部４１のＸ軸プラス方向の端部に位置している。フィルタコンデンサ固定部４２は、本体部４１のＸ軸プラス方向の端部からＸ軸方プラス方向に延設され、本体部４１と一体となっている。また、フィルタコンデンサ固定部４２はＸ軸プラス方向と上方とが開放されている。   Referring to FIG. 1 and FIG. 2, power conversion device 1 includes three semiconductor elements 21, 22, 23 arranged in parallel and constituting a power conversion circuit, and a DC current connected to a DC terminal of the power conversion circuit. And a housing 4 for housing the semiconductor elements 21, 22, 23. For the semiconductor elements 21, 22, and 23, for example, IGBTs (insulated gate bipolar transistors) for three phases of U, V, and W can be generally adopted. In the power conversion device 1, the direction in which the semiconductor elements 21, 22, and 23 are juxtaposed is defined as the Y-axis direction, and of the X-axis directions orthogonal to the Y-axis direction, the direction away from the semiconductor elements 21, 22, and 23 is defined as the X-axis plus ( As the (+) direction, the filter capacitor 3 is fixed to face the semiconductor elements 21, 22, 23 at a predetermined interval in the X-axis plus direction. The housing 4 includes a main body 41 that houses a semiconductor cooling unit having cooling fins and the like for cooling the semiconductor elements 21, 22, and 23, and a filter capacitor fixing part 42 for fixing the filter capacitor 3. I have. The main body 41 is opened in the positive X-axis direction, and the semiconductor elements 21, 22, and 23 are located at ends of the main body 41 in the positive X-axis direction. The filter capacitor fixing portion 42 extends in the X-axis plus direction from an end of the main body portion 41 in the X-axis plus direction, and is integrated with the main body portion 41. Further, the filter capacitor fixing portion 42 is open in the positive direction of the X-axis and upward.

また、電力変換装置１では、Ｘ軸プラス方向に延びる４本の固定フレーム５１，５２，５３，５４が、フィルタコンデンサ３の外側に配置されるように、筐体４の一部を構成するフィルタコンデンサ固定部４２のＹ軸方向の一方及び他方の端部４２ａ，４２ｂに支持されている。固定フレーム５１，５２は、フィルタコンデンサ固定部４２のＹ軸方向一方の端部４２ａの内面の上下に位置し、固定フレーム５３，５４は、フィルタコンデンサ固定部４２のＹ軸方向他方の端部４２ｂの内面の上下に位置している。固定フレーム５１，５２，５３，５４のＸ軸プラス方向の端面５１ａ，５２ａ，５３ａ，５４ａは、同一平面上に配置されている。また、各端面５１ａ，５２ａ，５３ａ，５４ａには、第１ねじ穴５１ｂ，５２ｂ，５３ｂ，５４ｂが設けられている。固定フレーム５１，５２，５３，５４の形状は、第１ねじ穴５１ｂ，５２ｂ，５３ｂ，５４ｂを設けることができる限り特に限定的ではない。例えば、ロッド状等であっても構わない。   Further, in the power converter 1, the filter constituting a part of the housing 4 is arranged such that the four fixed frames 51, 52, 53, 54 extending in the X-axis plus direction are arranged outside the filter capacitor 3. The capacitor fixing portion 42 is supported by one and the other ends 42a and 42b in the Y-axis direction. The fixed frames 51 and 52 are located above and below the inner surface of one end 42a of the filter capacitor fixing portion 42 in the Y-axis direction, and the fixed frames 53 and 54 are the other end 42b of the filter capacitor fixing portion 42 in the Y-axis direction. It is located above and below the inner surface. The end faces 51a, 52a, 53a, 54a of the fixed frames 51, 52, 53, 54 in the X-axis plus direction are arranged on the same plane. In addition, first screw holes 51b, 52b, 53b, 54b are provided in the end surfaces 51a, 52a, 53a, 54a. The shape of the fixed frames 51, 52, 53, 54 is not particularly limited as long as the first screw holes 51b, 52b, 53b, 54b can be provided. For example, a rod shape or the like may be used.

フィルタコンデンサ３のＸ軸プラス方向の端面３１には、Ｙ軸方向の一方及び他方の端部の上下に計４つの第２ねじ穴３１ａ，３１ｂ，３１ｃ，３１ｄが設けられている。いずれの第２ねじ穴３１ａ，３１ｂ，３１ｃ，３１ｄも非貫通のねじ穴である。また、フィルタコンデンサ３の上面３２には上方に突出する３つの端子部３２ａ，３２ｂ，３２ｃが設けられている。フィルタコンデンサ３の端面３１にはほぼ平板状の固定プレート６が固定される。固定プレート６は、Ｙ軸方向の長さがフィルタコンデンサ３よりも長くなっている。また、固定プレート６の上下両端縁部はＸ軸プラス方向に折曲され、折曲部６ａ，６ｂが設けられている。折曲部６ａ，６ｂは固定プレート６の面強度を所定のものに確保している。さらに、固定プレート６には、固定フレーム５１，５２，５３，５４の端面５１ａ，５２ａ，５３ａ，５４ａに設けられた第１ねじ穴５１ｂ，５２ｂ，５３ｂ，５４ｂに対置する部分に、第１ボルト６１を挿通可能とした第１貫通穴が設けられ、フィルタコンデンサ３の端面３１に設けられた第２ねじ穴３１ａ，３１ｂ，３１ｃ，３１ｄに対置する部分には、第２ボルト６２を挿通可能とした第２貫通穴が設けられている。   A total of four second screw holes 31a, 31b, 31c, 31d are provided above and below one end and the other end in the Y-axis direction of the end surface 31 of the filter capacitor 3 in the positive X-axis direction. Each of the second screw holes 31a, 31b, 31c, 31d is a non-penetrating screw hole. The upper surface 32 of the filter capacitor 3 is provided with three terminal portions 32a, 32b, 32c protruding upward. A substantially flat fixing plate 6 is fixed to the end face 31 of the filter capacitor 3. The fixed plate 6 has a length in the Y-axis direction longer than that of the filter capacitor 3. The upper and lower edges of the fixing plate 6 are bent in the X-axis positive direction, and bent portions 6a and 6b are provided. The bent portions 6a and 6b ensure the surface strength of the fixed plate 6 at a predetermined level. Further, the fixing plate 6 has a first bolt at a portion opposed to the first screw holes 51b, 52b, 53b, 54b provided in the end faces 51a, 52a, 53a, 54a of the fixing frames 51, 52, 53, 54. A first through-hole through which the first bolt 61 can be inserted is provided, and a second bolt 62 can be inserted through a portion opposed to the second screw holes 31a, 31b, 31c, 31d provided in the end face 31 of the filter capacitor 3. A second through hole is provided.

固定プレート６のフィルタコンデンサ３の端面３１への固定は、上記第２貫通穴の夫々を第２ねじ穴３１ａ，３１ｂ，３１ｃ，３１ｄの対応する一つと一致させ、各第２ボルト６２を各第２ねじ穴３１ａ，３１ｂ，３１ｃ，３１ｄにＸ軸プラス方向からマイナス（−）方向に螺入して締結することによって実現される。端面３１に固定プレート６が固定されたフィルタコンデンサ３を筐体４のフィルタコンデンサ固定部４２に支持された固定フレーム５１，５２，５３，５４の内側に配置し、固定プレート６のＸ軸マイナス方向の端面を固定フレーム５１，５２，５３，５４の端面５１ａ，５２ａ，５３ａ，５４ａに当接させると、フィルタコンデンサ３は、半導体素子２１，２２，２３からＸ軸方向に所定の間隔を存して対置する。また、固定プレート６の上記第１貫通穴の夫々が固定フレーム５１，５２，５３，５４の第１ねじ穴５１ｂ，５２ｂ，５３ｂ，５４ｂの対応する一つと一致する。この状態において、各第１ボルト６１を各第１ねじ穴５１ｂ，５２ｂ，５３ｂ，５４ｂからＸ軸プラス方向からマイナス方向に螺入して締結させると、フィルタコンデンサ３が、半導体素子２１，２２，２３からＸ軸プラス方向に所定の間隔を存して対置した状態で固定される。   The fixing of the fixing plate 6 to the end face 31 of the filter capacitor 3 is performed by matching each of the second through holes with the corresponding one of the second screw holes 31a, 31b, 31c, and 31d, and setting each second bolt 62 to each of the second bolts 62. This is realized by screwing into the two screw holes 31a, 31b, 31c, 31d from the plus direction of the X-axis in the minus (-) direction and fastening. The filter capacitor 3 having the fixed plate 6 fixed to the end face 31 is disposed inside the fixed frames 51, 52, 53, 54 supported by the filter capacitor fixed portion 42 of the housing 4. Is brought into contact with the end surfaces 51a, 52a, 53a, 54a of the fixed frames 51, 52, 53, 54, the filter capacitor 3 is spaced apart from the semiconductor elements 21, 22, 23 by a predetermined distance in the X-axis direction. Face to face. Further, each of the first through holes of the fixing plate 6 coincides with a corresponding one of the first screw holes 51b, 52b, 53b, 54b of the fixing frames 51, 52, 53, 54. In this state, when the first bolts 61 are screwed from the first screw holes 51b, 52b, 53b, 54b in the X-axis positive direction to the negative direction and fastened, the filter capacitor 3 becomes the semiconductor elements 21, 22, It is fixed in a state where it is opposed from 23 at a predetermined interval in the X-axis plus direction.

上記の如く、電力変換装置１では、筐体４に支持された固定フレーム５１，５２，５３，５４と、フィルタコンデンサ３に締結した固定プレート６との締結によって、半導体素子２１，２２，２３とフィルタコンデンサ３とをボルトで直接連結することなく、フィルタコンデンサ３を半導体素子２１，２２，２３からＸ軸プラス方向に所定間隔を存して対置させて固定できる。このため、フィルタコンデンサ３と半導体素子２１，２２，２３との間の絶縁状態が保たれる。   As described above, in the power conversion device 1, the semiconductor elements 21, 22, 23 are connected to the fixed frames 51, 52, 53, 54 supported by the housing 4 and the fixed plate 6 fixed to the filter capacitor 3. Without directly connecting the filter capacitor 3 to the filter capacitor 3 with bolts, the filter capacitor 3 can be fixed to be opposed to the semiconductor elements 21, 22, 23 at a predetermined interval in the X-axis plus direction. Therefore, an insulating state between the filter capacitor 3 and the semiconductor elements 21, 22, 23 is maintained.

以上、本発明の実施形態について図面を参照して説明したが、本発明はこれに限定されない。例えば、フィルタコンデンサ固定部４２は本体部４１と別体とし、相互の連結によって筐体４を構成することが可能である。また、フィルタコンデンサ固定部４２の形状は特に限定的ではなく、また、固定フレーム５１，５２，５３，５４の本数や形状、固定プレート６の形状等は両者が締結可能である限り任意のものを採用することができる。   Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited thereto. For example, the filter capacitor fixing part 42 can be formed separately from the main body part 41, and the housing 4 can be formed by mutual connection. The shape of the filter capacitor fixing portion 42 is not particularly limited, and the number and shape of the fixing frames 51, 52, 53, 54, the shape of the fixing plate 6, and the like are arbitrary as long as both can be fastened. Can be adopted.

１…電力変換装置、２１，２２，２３…半導体素子、３…フィルタコンデンサ、３１…フィルタコンデンサ３のＸ軸プラス方向の端面、４…筐体、５１，５２，５３，５４…固定フレーム、６…固定プレート。   DESCRIPTION OF SYMBOLS 1 ... Power conversion device, 21, 22, 23 ... Semiconductor element, 3 ... Filter capacitor, 31 ... End face of the filter capacitor 3 in the X-axis plus direction, 4 ... Housing, 51, 52, 53, 54 ... Fixed frame, 6 … Fixed plate.

Claims (1)

電力変換回路を構成する、並設された複数の半導体素子と、電力変換回路の直流端子に接続されて直流電流を平滑するフィルタコンデンサと、半導体素子を収納する筐体とを備え、半導体素子の並設方向をＹ軸方向とし、Ｙ軸方向と直交するＸ軸方向の内、半導体素子から遠ざかる方向をＸ軸プラス方向として、フィルタコンデンサが、複数の半導体素子からＸ軸プラス方向に所定の間隔を存して対置して固定される電力変換装置であって、
Ｘ軸プラス方向に延びる複数の固定フレームが、フィルタコンデンサの外側に配置されるように筐体のＹ軸方向の一方及び他方の端部に支持され、Ｙ軸方向の長さがフィルタコンデンサよりも長い固定プレートが、フィルタコンデンサのＸ軸プラス方向の端面に締結され、固定フレームのＸ軸プラス方向の端部に固定プレートが締結されて、フィルタコンデンサが、複数の半導体素子からＸ軸プラス方向に所定の間隔を存して対置して固定される
ことを特徴とする電力変換装置。 Constituting a power conversion circuit, a plurality of semiconductor elements arranged in parallel, a filter capacitor connected to a DC terminal of the power conversion circuit for smoothing a DC current, and a housing for housing the semiconductor element, comprising: A filter capacitor is provided at a predetermined distance in the X-axis plus direction from a plurality of semiconductor elements, with the direction parallel to the Y-axis direction and the direction away from the semiconductor element in the X-axis direction orthogonal to the Y-axis direction as the X-axis plus direction. A power converter fixed opposite to the presence of
A plurality of fixed frames extending in the X-axis plus direction are supported at one and the other ends in the Y-axis direction of the housing so as to be disposed outside the filter capacitor, and the length in the Y-axis direction is greater than that of the filter capacitor. A long fixing plate is fastened to the end surface of the filter capacitor in the plus direction of the X axis, and a fixed plate is fastened to an end of the fixed frame in the plus direction of the X axis. A power conversion device characterized in that the power conversion device is fixed opposite to a predetermined interval.
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JPH077924A (en) * 1993-04-22 1995-01-10 Fuji Electric Co Ltd Snubber unit
JP2010035346A (en) * 2008-07-29 2010-02-12 Hitachi Ltd Power conversion apparatus and power module
JP2012152104A (en) * 2012-05-16 2012-08-09 Hitachi Automotive Systems Ltd Power converter
CN204349819U (en) * 2015-01-30 2015-05-20 南车株洲电力机车研究所有限公司 A kind of simple and easy close-coupled power module device
CN107070256A (en) * 2017-02-17 2017-08-18 许继电气股份有限公司 A kind of power model and the photovoltaic combining inverter using the module

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH077924A (en) * 1993-04-22 1995-01-10 Fuji Electric Co Ltd Snubber unit
JP2010035346A (en) * 2008-07-29 2010-02-12 Hitachi Ltd Power conversion apparatus and power module
JP2012152104A (en) * 2012-05-16 2012-08-09 Hitachi Automotive Systems Ltd Power converter
CN204349819U (en) * 2015-01-30 2015-05-20 南车株洲电力机车研究所有限公司 A kind of simple and easy close-coupled power module device
CN107070256A (en) * 2017-02-17 2017-08-18 许继电气股份有限公司 A kind of power model and the photovoltaic combining inverter using the module

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