JP2011187702A - Power unit - Google Patents

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JP2011187702A
JP2011187702A JP2010051707A JP2010051707A JP2011187702A JP 2011187702 A JP2011187702 A JP 2011187702A JP 2010051707 A JP2010051707 A JP 2010051707A JP 2010051707 A JP2010051707 A JP 2010051707A JP 2011187702 A JP2011187702 A JP 2011187702A
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battery
converter
shield
vehicle body
low
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JP5198497B2 (en
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Kaoru Torii
薫 鳥居
Naohide Matsumura
直英 松村
Tomohiro Suguro
知弘 勝呂
Takashi Kojima
崇 小島
Koji Tsukada
浩司 塚田
Yoshikuni Hattori
佳晋 服部
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Toyota Motor Corp
Toyota Central R&D Labs Inc
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Toyota Central R&D Labs Inc
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  • Electric Propulsion And Braking For Vehicles (AREA)
  • Dc-Dc Converters (AREA)
  • Power Conversion In General (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To suppress noise on the side of a battery rather than a DC/DC converter, and to suppress the propagation of noise to a vehicle body. <P>SOLUTION: The terminal of a DC/DC converter 26 is connected with the positive electrode of a low-voltage battery 24 by a core wire 32 of a shield line 30, and a housing 27, to which the DC/DC converter 26 has been grounded, is connected with the negative electrode of the low-voltage battery 24 by a shield section 34 of the shield line 30 with approximately the same impedance as the core wire 32. After that, a high impedance member 40 having higher impedance than the shield section 34 is disposed between the negative electrode of the low-voltage battery 24 and a vehicle body 28. As a result, common-mode noise of a low-voltage system can be suppressed, and the propagation of noise current to the vehicle body 28 can be also suppressed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、電力装置に関する。   The present invention relates to a power device.

従来、接地線で金属製の車体に接地された金属製の筐体に収納されたインバータと、接地線で金属製の車体に接地された金属製の筐体に収納されたモータと、をシールド線によって接続した装置において、シールド線のシールド層を高周波リアクトルを介してモータまたはインバータの筐体に接続するものが提案されている（例えば、特許文献１参照）。この装置では、こうした構成により、シールド層に生じる高周波の電位変動を高周波リアクトルによって熱エネルギに変換して吸収し、高周波の電位変動が筐体，接地線を介して車体に伝播するのを抑制している。   Conventionally, an inverter housed in a metal casing grounded to a metal vehicle body with a ground wire and a motor housed in a metal housing grounded to the metal vehicle body with a ground wire are shielded. In a device connected by a wire, a device in which a shield layer of a shield wire is connected to a housing of a motor or an inverter via a high frequency reactor has been proposed (for example, see Patent Document 1). With this configuration, this device converts high-frequency potential fluctuations that occur in the shield layer into thermal energy by a high-frequency reactor and absorbs it, and suppresses high-frequency potential fluctuations from propagating to the vehicle body via the housing and grounding wire. ing.

特開２００６−８０２１５号公報JP 2006-80215 A

ところで、上述の構成の他に、負極が接地線によって車体に接地された低圧バッテリや、インバータなどが接続された高圧系の電力を降圧して低圧バッテリ側に供給するＤＣ／ＤＣコンバータなどを備えるものでは、モータとインバータとをシールド線で接続するだけでは、ＤＣ／ＤＣコンバータで発生したノイズが電子機器や低圧バッテリなどを介して車体に伝播されるという課題があった。   By the way, in addition to the above-described configuration, a low-voltage battery whose negative electrode is grounded to the vehicle body by a grounding wire, a DC / DC converter that steps down high-voltage power to which an inverter or the like is connected, and supplies it to the low-voltage battery side are provided. However, there is a problem that noise generated by a DC / DC converter is transmitted to a vehicle body via an electronic device or a low-voltage battery only by connecting a motor and an inverter with a shield wire.

本発明の電力装置は、ＤＣ／ＤＣコンバータよりもバッテリ側においてノイズを抑制すると共にノイズの車体への伝播を抑制することを主目的とする。   The main purpose of the power device of the present invention is to suppress noise on the battery side of the DC / DC converter and to suppress propagation of noise to the vehicle body.

本発明の電力装置は、上述の主目的を達成するために以下の手段を採った。   The power device of the present invention employs the following means in order to achieve the main object described above.

本発明の電力装置は、
バッテリと、筐体に収納されて前記バッテリよりも電圧が高い高圧系の電力を降圧して前記バッテリ側に供給するＤＣ／ＤＣコンバータと、を備え、車載された電力装置において、
前記ＤＣ／ＤＣコンバータの端子と前記バッテリの正極とがシールド線の芯線によって接続され、前記ＤＣ／ＤＣコンバータが接地された前記筐体と前記バッテリの負極とが前記シールド線の芯線と略同一のインピーダンスの前記シールド線のシールド部によって接続され、前記バッテリの負極と車体とが前記シールド部に比してインピーダンスが高くなるよう接続されてなる、
を備えることを要旨とする。 The power device of the present invention is
In a vehicle-mounted power device comprising: a battery; and a DC / DC converter that steps down a high-voltage power that is housed in a housing and has a higher voltage than the battery and supplies the power to the battery side.
The terminal of the DC / DC converter and the positive electrode of the battery are connected by a core wire of a shield wire, and the casing where the DC / DC converter is grounded and the negative electrode of the battery are substantially the same as the core wire of the shield wire. It is connected by a shield part of the shield wire of impedance, and the negative electrode of the battery and the vehicle body are connected so that the impedance is higher than that of the shield part.
It is a summary to provide.

この本発明の電力装置では、ＤＣ／ＤＣコンバータの端子（出力ライン）とバッテリの正極とをシールド線の芯線によって接続し、ＤＣ／ＤＣコンバータが接地された筐体とバッテリの負極とをシールド線の芯線と略同一のインピーダンスのシールド線のシールド部によって接続し、バッテリの負極と車体とをシールド部に比してインピーダンスが高くなるよう接続する。したがって、シールド線の芯線とシールド部とのインピーダンスを略同一にすることにより、コモンモードノイズを抑制することができ、バッテリの負極と車体とをシールド部に比してインピーダンスが高くなるよう接続することにより、ノイズの車体への伝播を抑制することができる。ここで、後者については、シールド部に比してインピーダンスが高いハイインピーダンス部材をバッテリの負極と車体とに介在させる、ものとすることもできる。   In the power device of the present invention, the terminal (output line) of the DC / DC converter and the positive electrode of the battery are connected by the core wire of the shield wire, and the casing grounded by the DC / DC converter and the negative electrode of the battery are shielded. Are connected by a shield portion of a shield wire having substantially the same impedance as the core wire, and the negative electrode of the battery and the vehicle body are connected so that the impedance is higher than that of the shield portion. Therefore, common mode noise can be suppressed by making the impedance of the core wire of the shield wire and the shield portion substantially the same, and the negative electrode of the battery and the vehicle body are connected so that the impedance is higher than that of the shield portion. As a result, the propagation of noise to the vehicle body can be suppressed. Here, regarding the latter, a high-impedance member having a higher impedance than the shield part may be interposed between the negative electrode of the battery and the vehicle body.

本発明の一実施例としての電力装置２０の構成の概略を示す構成図である。It is a block diagram which shows the outline of a structure of the electric power apparatus 20 as one Example of this invention. ＤＣ／ＤＣコンバータ２６と低圧系のノイズの伝播の様子を説明するための回路図である。It is a circuit diagram for demonstrating the mode of propagation of the noise of the DC / DC converter 26 and a low voltage | pressure system. 各周波数についてのノイズレベルの一例を示す説明図である。It is explanatory drawing which shows an example of the noise level about each frequency.

次に、本発明を実施するための形態を実施例を用いて説明する。   Next, the form for implementing this invention is demonstrated using an Example.

図１は、本発明の一実施例としての電力装置２０の構成の概略を示す構成図である。実施例の電力装置２０は、例えば同期発電電動機として構成されたモータ１２やモータ１２を駆動するためのインバータ１４，例えば定格電圧が２００Ｖのリチウムイオン二次電池などの二次電池として構成されてインバータ１４を介してモータ１２と電力をやりとり可能な高圧バッテリ１６などと共に電気自動車やハイブリット自動車などに搭載され、図示するように、例えば定格電圧が１２Ｖの鉛蓄電池などの高圧バッテリ１６より電圧が低い二次電池として構成された低圧バッテリ２４と、高圧バッテリ１６やインバータ１４側の電力を降圧して低圧バッテリ２４側に供給するＤＣ／ＤＣコンバータ２６と、を備える。なお、モータ１２は金属製の筐体１３に収納されており、インバータ１４やＤＣ／ＤＣコンバータ２６は金属製の筐体２７に収納されており、高圧バッテリ１６は金属製の筐体１６に収納されている。また、筐体１３や筐体１５，低圧バッテリ２４の負極，筐体２７などは導電ラインによって金属製の車体２８に接地されている。以下、ＤＣ／ＤＣコンバータ２６よりもインバータ１４や高圧バッテリ１６側を高圧系といい、ＤＣ／ＤＣコンバータ２６よりも低圧バッテリ２４側を低圧系という。   FIG. 1 is a configuration diagram showing an outline of a configuration of a power device 20 as an embodiment of the present invention. The power device 20 of the embodiment is configured as, for example, a motor 12 configured as a synchronous generator motor or an inverter 14 for driving the motor 12, for example, a secondary battery such as a lithium ion secondary battery having a rated voltage of 200V. 14 is mounted on an electric vehicle, a hybrid vehicle, and the like together with a high voltage battery 16 capable of exchanging electric power with the motor 12 via 14, and has a lower voltage than the high voltage battery 16 such as a lead storage battery having a rated voltage of 12 V, for example. A low voltage battery 24 configured as a secondary battery, and a DC / DC converter 26 that steps down the power on the high voltage battery 16 and the inverter 14 side and supplies the reduced voltage to the low voltage battery 24 side. The motor 12 is housed in a metal housing 13, the inverter 14 and the DC / DC converter 26 are housed in a metal housing 27, and the high voltage battery 16 is housed in the metal housing 16. Has been. In addition, the housing 13 and the housing 15, the negative electrode of the low-voltage battery 24, the housing 27, and the like are grounded to the metal vehicle body 28 by conductive lines. Hereinafter, the inverter 14 and the high voltage battery 16 side of the DC / DC converter 26 are referred to as a high voltage system, and the low voltage battery 24 side of the DC / DC converter 26 is referred to as a low voltage system.

ＤＣ／ＤＣコンバータ２６は、図示しないが、スイッチング回路のスイッチング素子のスイッチングによって高圧系の電力を直流から交流に変換し、変換した電力をトランスによって降圧し、降圧した電力を整流回路によって整流して低圧系に供給できるように構成されている。   Although not shown, the DC / DC converter 26 converts high-voltage power from direct current to alternating current by switching the switching element of the switching circuit, steps down the converted power with a transformer, and rectifies the stepped down power with a rectifier circuit. It is configured so that it can be supplied to a low pressure system.

実施例の電力装置２０では、ＤＣ／ＤＣコンバータ２６の端子（出力ライン）と低圧バッテリ２４の正極とは、内側から順に芯線３２，絶縁体，シールド部（例えば、編組線など）３４，保護被覆の順に形成されたシールド線３０の芯線３２によって接続されている。また、ＤＣ／ＤＣコンバータ２６が接地された筐体２７と低圧バッテリ２４の負極とは、芯線３２と略同一（同一または予め定められた許容範囲内）のインピーダンスで且つ芯線３２に対する静電シールドとしての機能を有するシールド部３４によって接続されている。さらに、低圧バッテリ２４の負極と車体２８との間の導電ラインには、芯線３２やシールド部３４に比してインピーダンスが高い部材（以下、ハイインピーダンス部材（例えば、フェライトコアやインダクタなど）４０が設けられている。このハイインピーダンス部材４０は、直流分への影響を抑制するために、抵抗成分の比較的小さい部材を用いることが好ましい。加えて、実施例では、ライトや音響機器などの電子機器３８の一方の端子が芯線３２やシールド部３４に比してインピーダンスが高い（例えば、芯線３２やシールド部３４に比して長さが長い）ケーブル３６によってリレーボックス（ヒューズやレジスタなどを有する）３７を介して芯線３２に接続されていると共に、電子機器３８の他方の端子が導電ラインによって車体２８に接地されている。   In the power device 20 of the embodiment, the terminal (output line) of the DC / DC converter 26 and the positive electrode of the low-voltage battery 24 are arranged in order from the inside, the core wire 32, an insulator, a shield part (for example, a braided wire) 34, and a protective coating. Are connected by the core wire 32 of the shield wire 30 formed in this order. Further, the casing 27 to which the DC / DC converter 26 is grounded and the negative electrode of the low-voltage battery 24 have an impedance substantially the same as the core wire 32 (same or within a predetermined allowable range) and serve as an electrostatic shield for the core wire 32. It is connected by a shield part 34 having the function of. Further, the conductive line between the negative electrode of the low-voltage battery 24 and the vehicle body 28 has a member (hereinafter referred to as a high impedance member (for example, a ferrite core or an inductor)) 40 having a higher impedance than the core wire 32 and the shield part 34. In order to suppress the influence on the direct current component, it is preferable to use a member having a relatively small resistance component for the high impedance member 40. In addition, in the embodiment, an electronic device such as a light or an acoustic device is used. One terminal of the device 38 has a higher impedance than the core wire 32 or the shield part 34 (for example, longer than the core wire 32 or the shield part 34). ) Is connected to the core wire 32 via 37, and the other terminal of the electronic device 38 is connected to the vehicle body 2 by a conductive line. It is grounded in.

図２は、ＤＣ／ＤＣコンバータ２６と低圧系のノイズの伝播の様子を説明するための回路図である。図２から解るように、ＤＣ／ＤＣコンバータ２６から低圧系に出力されるノイズ電流は、芯線３２を介して低圧バッテリ２４の正極に入力されて更に低圧バッテリ２４の負極からシールド部３４を介して筐体２７に入力される。しかし、芯線３２とシールド部３４とではノイズ電流の方向が逆になり、また、実施例では、芯線３２とシールド部３４とのインピーダンスが略同一になるようにしたから、芯線３２のノイズ電流とシールド部３４のノイズ電流とは互いに打ち消されることになり、低圧系のコモンモードノイズを抑制することができる。しかも、低圧バッテリ２４の負極と車体２８とにハイインピーダンス部材４０を介在させることにより、低圧バッテリ２４を介して車体２８にノイズ電流が伝播されるのをより抑制することができ、ケーブル３６のインピーダンスが芯線３２やシールド部３４のインピーダンスに比して高くなるようにすることにより、芯線３２から電子機器３８を介して車体２８にノイズ電流が伝播されるのを抑制することができる。これらより、ノイズ電流のループが形成されるのを抑制することができ、電磁ノイズを抑制することができる。参考のために、各周波数についてのノイズレベルの一例を図３に示す。図中、実線は、ＤＣ／ＤＣコンバータ２６と低圧バッテリ２４とをシールド線３０によって接続すると共にハイインピーダンス部材４０を低圧バッテリ２４の負極と車体２８とに介在させる実施例の場合を示し、破線は、ＤＣ／ＤＣコンバータ２６と低圧バッテリ２４とをシールド線ではなく通常のケーブルによって接続すると共にハイインピーダンス部材４０を低圧バッテリ２４の負極と車体２８とに介在させない比較例の場合を示す。実施例の場合、図３から明らかなように、比較例に比してノイズが低減されている。   FIG. 2 is a circuit diagram for explaining how the DC / DC converter 26 and low-voltage noise propagate. As can be seen from FIG. 2, the noise current output from the DC / DC converter 26 to the low voltage system is input to the positive electrode of the low voltage battery 24 via the core wire 32 and further from the negative electrode of the low voltage battery 24 via the shield part 34. Input to the housing 27. However, the direction of the noise current is reversed between the core wire 32 and the shield part 34, and in the embodiment, the impedance of the core wire 32 and the shield part 34 is made substantially the same. The noise current of the shield part 34 cancels each other, and low-voltage common mode noise can be suppressed. In addition, by interposing the high impedance member 40 between the negative electrode of the low voltage battery 24 and the vehicle body 28, it is possible to further suppress the propagation of noise current to the vehicle body 28 via the low voltage battery 24, and the impedance of the cable 36. Is made higher than the impedance of the core wire 32 and the shield part 34, it is possible to suppress the propagation of noise current from the core wire 32 to the vehicle body 28 via the electronic device 38. As a result, the formation of a noise current loop can be suppressed, and electromagnetic noise can be suppressed. For reference, an example of the noise level for each frequency is shown in FIG. In the figure, the solid line shows the case of the embodiment in which the DC / DC converter 26 and the low voltage battery 24 are connected by the shield wire 30 and the high impedance member 40 is interposed between the negative electrode of the low voltage battery 24 and the vehicle body 28, and the broken line is A case of a comparative example in which the DC / DC converter 26 and the low voltage battery 24 are connected not by a shielded wire but by a normal cable and the high impedance member 40 is not interposed between the negative electrode of the low voltage battery 24 and the vehicle body 28 will be described. In the case of the example, as is clear from FIG. 3, the noise is reduced as compared with the comparative example.

また、実施例の電力装置２０では、実施例の筐体１３と車体２８との間の導電ライン，筐体１５と車体２８との間の導電ライン，筐体２７と車体２８との間の導電ラインには、それぞれ、ハイインピーダンス部材４０と同様のハイインピーダンス部材４２，４４，４６が設けられている。これにより、筐体１３や筐体１５，筐体２７から車体２８にノイズ電流が伝播されるのをより抑制することができる。   In the power device 20 of the embodiment, the conductive line between the casing 13 and the vehicle body 28 of the embodiment, the conductive line between the casing 15 and the vehicle body 28, and the conductivity between the casing 27 and the vehicle body 28 are used. High impedance members 42, 44, and 46 similar to the high impedance member 40 are provided on the lines, respectively. Thereby, it is possible to further suppress the propagation of noise current from the housing 13, the housing 15, and the housing 27 to the vehicle body 28.

以上説明した実施例の電力装置２０によれば、ＤＣ／ＤＣコンバータ２６の端子と低圧バッテリ２４の正極とをシールド線３０の芯線３２によって接続し、ＤＣ／ＤＣコンバータ２６が接地された筐体２７と低圧バッテリ２４の負極とを芯線３２と略同一のインピーダンスのシールド線３０のシールド部３４によって接続し、シールド部３４に比してインピーダンスが高いハイインピーダンス部材４０を低圧バッテリ２４の負極と車体２８とに介在させるから、低圧系のコモンモードノイズを抑制することができると共にノイズ電流の車体２８への伝播を抑制することができる。   According to the power device 20 of the embodiment described above, the casing 27 in which the terminal of the DC / DC converter 26 and the positive electrode of the low-voltage battery 24 are connected by the core wire 32 of the shield wire 30 and the DC / DC converter 26 is grounded. And the negative electrode of the low-voltage battery 24 are connected by the shield part 34 of the shield wire 30 having substantially the same impedance as the core wire 32, and the high-impedance member 40 having a higher impedance than the shield part 34 is connected to the negative electrode of the low-voltage battery 24 and the vehicle body 28. Therefore, low-voltage common mode noise can be suppressed and propagation of noise current to the vehicle body 28 can be suppressed.

実施例の電力装置２０では、シールド部３４に比してインピーダンスが高いハイインピーダンス部材４０を低圧バッテリ２４の負極と車体２８とに介在させるものとしたが、低圧バッテリ２４の負極と車体２８とをシールド部３４に比してインピーダンスが高くなるよう接続するものであればよく、例えば、シールド部３４に比してインピーダンスが高い（例えば、芯線３２やシールド部３４に比して長さが長い）ケーブルによって低圧バッテリ２４の負極と車体２８とを接続するものなどとしてもよい。   In the power device 20 of the embodiment, the high impedance member 40 having a higher impedance than the shield part 34 is interposed between the negative electrode of the low voltage battery 24 and the vehicle body 28. However, the negative electrode of the low voltage battery 24 and the vehicle body 28 are connected to each other. What is necessary is just to connect so that impedance may become high compared with the shield part 34, for example, impedance is high compared with the shield part 34 (for example, length is long compared with the core wire 32 and the shield part 34). It is good also as what connects the negative electrode of the low voltage battery 24, and the vehicle body 28 with a cable.

実施例の主要な要素と課題を解決するための手段の欄に記載した発明の主要な要素との対応関係について説明する。実施例では、低圧バッテリ２４が「バッテリ」に相当し、ＤＣ／ＤＣコンバータ２６が「ＤＣ／ＤＣコンバータ」に相当し、シールド線３０の芯線３２が「芯線」に相当し、シールド線３０のシールド部３４が「シールド部」に相当し、ハイインピーダンス部材４０が「ハイインピーダンス部材」に相当する。   The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the low voltage battery 24 corresponds to a “battery”, the DC / DC converter 26 corresponds to a “DC / DC converter”, the core wire 32 of the shield wire 30 corresponds to a “core wire”, and the shield of the shield wire 30. The portion 34 corresponds to a “shield portion”, and the high impedance member 40 corresponds to a “high impedance member”.

なお、実施例の主要な要素と課題を解決するための手段の欄に記載した発明の主要な要素との対応関係は、実施例が課題を解決するための手段の欄に記載した発明を実施するための形態を具体的に説明するための一例であることから、課題を解決するための手段の欄に記載した発明の要素を限定するものではない。即ち、課題を解決するための手段の欄に記載した発明についての解釈はその欄の記載に基づいて行なわれるべきものであり、実施例は課題を解決するための手段の欄に記載した発明の具体的な一例に過ぎないものである。   The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

以上、本発明を実施するための形態について実施例を用いて説明したが、本発明はこうした実施例に何等限定されるものではなく、本発明の要旨を逸脱しない範囲内において、種々なる形態で実施し得ることは勿論である。   As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

本発明は、電力装置の製造産業に利用可能である。   The present invention is applicable to the power device manufacturing industry.

１２ モータ、１３ 筐体、１４ インバータ、１５ 筐体、１６ 高圧バッテリ、２０ 電力装置、２４ 低圧バッテリ、２６ ＤＣ／ＤＣコンバータ、２７ 筐体、２８ 車体、３０ シールド線、３２ 芯線、３４ シールド部、３６ ケーブル、３８ 電子機器、４０，４２，４４，４６ ハイインピーダンス部材。   12 motor, 13 housing, 14 inverter, 15 housing, 16 high voltage battery, 20 power device, 24 low voltage battery, 26 DC / DC converter, 27 housing, 28 vehicle body, 30 shield wire, 32 core wire, 34 shield portion, 36 Cable, 38 Electronic equipment, 40, 42, 44, 46 High impedance member.

Claims (1)

バッテリと、筐体に収納されて前記バッテリよりも電圧が高い高圧系の電力を降圧して前記バッテリ側に供給するＤＣ／ＤＣコンバータと、を備え、車載された電力装置において、
前記ＤＣ／ＤＣコンバータの端子と前記バッテリの正極とがシールド線の芯線によって接続され、前記ＤＣ／ＤＣコンバータが接地された前記筐体と前記バッテリの負極とが前記シールド線の芯線と略同一のインピーダンスの前記シールド線のシールド部によって接続され、前記バッテリの負極と車体とが前記シールド部に比してインピーダンスが高くなるよう接続されてなる、
ことを特徴とする電力装置。 In a vehicle-mounted power device comprising: a battery; and a DC / DC converter that steps down a high-voltage power that is housed in a housing and has a higher voltage than the battery and supplies the power to the battery side.
The terminal of the DC / DC converter and the positive electrode of the battery are connected by a core wire of a shield wire, and the casing where the DC / DC converter is grounded and the negative electrode of the battery are substantially the same as the core wire of the shield wire. It is connected by a shield part of the shield wire of impedance, and the negative electrode of the battery and the vehicle body are connected so that the impedance is higher than that of the shield part.
A power device characterized by that.
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