JP2016029872A

JP2016029872A - Power supply device

Info

Publication number: JP2016029872A
Application number: JP2014151793A
Authority: JP
Inventors: 賢太郎秦; Kentaro Hata; クライソン　トロンナムチャイ; Tronnamchai Kleison; トロンナムチャイクライソン; 明範大久保; Akinori Okubo; 林　哲也; Tetsuya Hayashi; 林　　哲也
Original assignee: Nissan Motor Co Ltd
Current assignee: Nissan Motor Co Ltd
Priority date: 2014-07-25
Filing date: 2014-07-25
Publication date: 2016-03-03
Anticipated expiration: 2034-07-25
Also published as: JP6451124B2

Abstract

PROBLEM TO BE SOLVED: To inhibit noise occurring in a switching circuit from being propagated to a housing in a power supply device.SOLUTION: An electric power conversion device 1 includes: a power supply circuit 10; a cooling member 20; an insulation member 30; and a housing 40. The power supply device 1 includes: the power supply circuit 10 serving as a switching circuit which generates high frequency noise; the cooling member 20 which cools the switching circuit; the housing 40 which houses the switching circuit and the cooling member 20; and the insulation member 30 provided between the cooling member 20 and the housing 40 and supporting the cooling member 20.SELECTED DRAWING: Figure 1

Description

本発明は、電源装置に関するものである。 The present invention relates to a power supply device.

交流電源に接続されたコンバータと、このコンバータの直流出力側に接続されたインバータと、直流中間回路に接続された直流平滑コンデンサとを有する電力変換装置を対象とし、インバータを構成する半導体スイッチング素子のオン・オフにより電力変換装置を流れるノイズ電流を低減させるためのノイズ低減装置が知られている。ノイズ低減装置は、前記ノイズ電流を検出するノイズ電流検出手段と、検出されたノイズ電流を低減させるためのノイズ補償電流を生成して電力変換装置に供給するノイズ補償電流供給手段とを備えている。そして、ノイズ補償電流供給手段は、ノイズ電流検出手段の検出信号により出力電流が制御される素子であって直流中間回路の電圧より低い耐圧を有するトランジスタと、ツェナダイオードとの直列回路を備えている（特許文献１）。 A power converter having a converter connected to an AC power source, an inverter connected to the DC output side of the converter, and a DC smoothing capacitor connected to a DC intermediate circuit, and a semiconductor switching element constituting the inverter There is known a noise reduction device for reducing a noise current flowing through a power conversion device by turning on and off. The noise reduction device includes noise current detection means for detecting the noise current, and noise compensation current supply means for generating a noise compensation current for reducing the detected noise current and supplying the noise compensation current to the power conversion device. . The noise compensation current supply means includes a series circuit of a Zener diode and a transistor whose output current is controlled by a detection signal of the noise current detection means and having a breakdown voltage lower than the voltage of the DC intermediate circuit. (Patent Document 1).

特開２００２−２５２９８５号公報JP 2002-252985 A

しかしながら、上記従来のノイズ低減装置において、トランジスタ及びツェナダイオードを安価な素子で構成した場合には、トランジスタ及びツェナダイオードを高速に動作させることができないため、高周波のスイッチングノイズが装置の筐体へ伝搬する、という問題があった。 However, in the above conventional noise reduction device, when the transistor and the Zener diode are composed of inexpensive elements, the transistor and the Zener diode cannot be operated at high speed, so that high-frequency switching noise propagates to the housing of the device. There was a problem of doing.

本発明が解決しようとする課題は、電源装置において、スイッチング回路で発生したノイズの筐体への伝搬を抑制することである。 The problem to be solved by the present invention is to suppress the propagation of noise generated in the switching circuit to the housing in the power supply device.

本発明は、スイッチング回路と、スイッチング回路を冷却する冷却部材とを筐体に収容し、冷却部材を支持する第１絶縁部材を、冷却部材と前記筐体との間に設けることによって上記課題を解決する。 This invention accommodates the said subject by accommodating the switching circuit and the cooling member which cools a switching circuit in a housing | casing, and providing the 1st insulating member which supports a cooling member between a cooling member and the said housing | casing. Solve.

本発明は、第１絶縁部材により冷却部材と筐体との間のインピーダンスが高くなるため、スイッチング回路で発生したノイズが筐体に伝搬することを抑制できる。 In the present invention, since the impedance between the cooling member and the casing is increased by the first insulating member, it is possible to suppress the noise generated in the switching circuit from propagating to the casing.

図１は本発明の実施形態に係る電力変換装置の斜視図である。FIG. 1 is a perspective view of a power converter according to an embodiment of the present invention. 図２は図１のII-II線に沿う断面図である。FIG. 2 is a sectional view taken along line II-II in FIG. 図３は電源回路の回路図である。FIG. 3 is a circuit diagram of the power supply circuit. 図４は電源回路の回路図である。FIG. 4 is a circuit diagram of the power supply circuit. 図５は電源回路の回路図である。FIG. 5 is a circuit diagram of the power supply circuit. 図６は電力変換装置の各構成の接続状態を説明するための回路図である。FIG. 6 is a circuit diagram for explaining a connection state of each component of the power conversion device. 図７は、周波数に対するインピーダンス特性を示すグラフである。FIG. 7 is a graph showing impedance characteristics with respect to frequency. 図８は本発明の他の実施形態に係る電力変換装置の斜視図である。FIG. 8 is a perspective view of a power converter according to another embodiment of the present invention. 図９は図８のIV-IV線に沿う断面図である。FIG. 9 is a sectional view taken along line IV-IV in FIG. 図１０は図９のX線で囲う部分の拡大図である。FIG. 10 is an enlarged view of a portion surrounded by the X-ray in FIG. 図１１（ａ）は、冷却部材と導電部材と間のノイズ伝搬を概念的に表した図である。図１１（ｂ）はノイズ電圧の時間特性を示すグラフである。FIG. 11A is a diagram conceptually showing noise propagation between the cooling member and the conductive member. FIG. 11B is a graph showing the time characteristics of the noise voltage. 図１２（ａ）は、冷却部材と導電部材と間のノイズ伝搬を概念的に表した図である。図１２（ｂ）はノイズ電圧の時間特性を示すグラフである。FIG. 12A is a diagram conceptually showing noise propagation between the cooling member and the conductive member. FIG. 12B is a graph showing the time characteristics of the noise voltage. 図１３（ａ）は、冷却部材と導電部材と間のノイズ伝搬を概念的に表した図である。図１３（ｂ）はノイズ電圧の時間特性を示すグラフである。FIG. 13A is a diagram conceptually illustrating noise propagation between the cooling member and the conductive member. FIG. 13B is a graph showing the time characteristics of the noise voltage. 図１４は本発明の他の実施形態に係る電力変換装置の斜視図である。FIG. 14 is a perspective view of a power converter according to another embodiment of the present invention. 図１５は、導電部材、絶縁部材、及び筐体の接続部分を説明するための一部断面図である。FIG. 15 is a partial cross-sectional view for explaining a connecting portion of the conductive member, the insulating member, and the housing. 図１６は電力変換装置の各構成の接続状態を説明するための回路図である。FIG. 16 is a circuit diagram for explaining a connection state of each component of the power conversion device. 図１７は変形例に係る電力変換装置の斜視図である。FIG. 17 is a perspective view of a power converter according to a modification. 図１８は本発明の他の実施形態に係る電力変換装置の斜視図である。FIG. 18 is a perspective view of a power converter according to another embodiment of the present invention. 図１９は電力変換装置の各構成の接続状態を説明するための回路図である。FIG. 19 is a circuit diagram for explaining a connection state of each component of the power conversion device. 図２０は本発明の他の実施形態に係る電力変換装置の断面図である。FIG. 20 is a cross-sectional view of a power converter according to another embodiment of the present invention. 図２１は電力変換装置の各構成の接続状態を説明するための回路図である。FIG. 21 is a circuit diagram for explaining a connection state of each component of the power conversion device. 図２２は本発明の他の実施形態に係る電力変換装置の斜視図である。FIG. 22 is a perspective view of a power converter according to another embodiment of the present invention. 図２３は図２２のXXIII-XXIII線に沿う断面図である。23 is a cross-sectional view taken along line XXIII-XXIII in FIG. 図２４は電力変換装置の各構成の接続状態を説明するための回路図である。FIG. 24 is a circuit diagram for explaining a connection state of each component of the power conversion device. 図２５は本発明の他の実施形態に係る電力変換装置の断面図である。FIG. 25 is a cross-sectional view of a power converter according to another embodiment of the present invention. 図２６は電力変換装置の各構成の接続状態を説明するための回路図である。FIG. 26 is a circuit diagram for explaining a connection state of each component of the power conversion device. 図２７は本発明の他の実施形態に係る電力変換装置の斜視図である。FIG. 27 is a perspective view of a power converter according to another embodiment of the present invention. 図２８は図２７のXXVIII-XXVIII線に沿う断面図である。28 is a cross-sectional view taken along line XXVIII-XXVIII in FIG. 図２９は電力変換装置の各構成の接続状態を説明するための回路図である。FIG. 29 is a circuit diagram for explaining a connection state of each component of the power conversion device. 図３０は変形例に係る電力変換装置の斜視図である。FIG. 30 is a perspective view of a power converter according to a modification.

以下、本発明の実施形態を図面に基づいて説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

《第１実施形態》
本発明の実施形態に係る電源装置を説明する。電源装置は、例えば車両に設けられており、車載バッテリの電力を変換する装置として用いられる。なお、以下では、電源装置の例として、電力変換装置を挙げた上で、実施形態を説明する。電源装置は、電力変換装置に限らず、高周波のノイズを発生する回路を含んだ装置であればよい。また電源装置は、車両に限らず、他の装置又はシステムに設けられていてもよい。 << First Embodiment >>
A power supply device according to an embodiment of the present invention will be described. The power supply device is provided in a vehicle, for example, and is used as a device that converts the power of the in-vehicle battery. In addition, below, after mentioning a power converter as an example of a power supply device, an embodiment will be described. The power supply device is not limited to a power conversion device, and may be a device including a circuit that generates high-frequency noise. Further, the power supply device is not limited to the vehicle, and may be provided in another device or system.

図１は電力変換装置の斜視図である。図２は、図１のII-II線に沿う断面図である。電力変換装置１は、電源回路１０、冷却部材２０、絶縁部材３０、及び筐体４０を備えている。なお、図１について、電源回路１０、冷却部材２０及び絶縁部材３０は筐体４０に収容されているため、外側から見えないが説明のために、図示している。以下、他の実施形態で示す斜視図についても、同様に図示する。 FIG. 1 is a perspective view of the power converter. 2 is a cross-sectional view taken along the line II-II in FIG. The power conversion device 1 includes a power supply circuit 10, a cooling member 20, an insulating member 30, and a housing 40. In FIG. 1, the power supply circuit 10, the cooling member 20, and the insulating member 30 are housed in the housing 40 and are not visible from the outside, but are illustrated for the sake of explanation. Hereinafter, the perspective views shown in other embodiments are also illustrated in the same manner.

電源回路１０は、高周波のノイズを発生するスイッチング回路である。電源回路は、筐体４０の内部に設けられており、パワーモジュールを有している。パワーモジュールは、ＩＧＢＴ等のパワー半導体素子（スイッチング素子）をモジュール化した部材である。パワー半導体素子は、制御回路から送信されるスイッチング信号により、スイッチのオン、オフを切り替える。そして、パワー半導体素子のオン、オフが切り替わることで、電源回路１０は、入力電力を変換している。 The power supply circuit 10 is a switching circuit that generates high-frequency noise. The power supply circuit is provided inside the housing 40 and has a power module. The power module is a member obtained by modularizing a power semiconductor element (switching element) such as an IGBT. The power semiconductor element switches the switch on and off by a switching signal transmitted from the control circuit. And the power supply circuit 10 is converting input power by switching on and off of a power semiconductor element.

図３〜図５を用いて、電源回路の例を説明する。図３は、コンバータ（非絶縁型の昇圧回路）の回路図である。図３に示すコンバータは、直流電源の電圧を高い電圧に変換する昇圧回路である。コンバータは、主に低電圧電源から高電圧電源へ電力を供給する場合に用いられる。制御回路１１ａは、半導体スイッチ１１ａにスイッチング信号を送信する。そして、スイッチング信号のデューティ比が制御されることで、入力電圧（Ｖｉｎ）が昇圧されて、昇圧された電圧が出力電圧（Ｖｏｕｔ）として出力される。このとき、半導体スイッチ１１ｂのオン、オフに伴い、電源回路１０はノイズを発生する。 An example of a power supply circuit will be described with reference to FIGS. FIG. 3 is a circuit diagram of a converter (non-insulated booster circuit). The converter shown in FIG. 3 is a booster circuit that converts the voltage of a DC power source into a high voltage. The converter is mainly used when power is supplied from a low voltage power source to a high voltage power source. The control circuit 11a transmits a switching signal to the semiconductor switch 11a. Then, by controlling the duty ratio of the switching signal, the input voltage (Vin) is boosted, and the boosted voltage is output as the output voltage (Vout). At this time, the power supply circuit 10 generates noise as the semiconductor switch 11b is turned on and off.

図４は、絶縁側コンバータの回路図である。電源回路１０は、パワーモジュール１２ａ、トランス１２ｂ、複数のダイオード１２ｃ、複数の平滑コンデンサ１２ｄ、及び、制御回路１２ｅを有している。電源回路１０は、電圧の入力側から出力側に向けて、平滑コンデンサ１２ｄ、パワーモジュール１２ａ、トランス１２ｂ、複数のダイオード１２ｃ、及び平滑コンデンサ１２ｄの順に接続されている。制御回路１２ｅは、パワーモジュール１２ａを構成するスイッチング素子に対して、スイッチング信号を送信する。そして、パワーモジュール１２ａのスイッチング動作により、電力が変換される。このとき、パワーモジュール１２ａのスイッチング動作に伴い、電源回路１０はノイズを発生する。 FIG. 4 is a circuit diagram of the isolated converter. The power supply circuit 10 includes a power module 12a, a transformer 12b, a plurality of diodes 12c, a plurality of smoothing capacitors 12d, and a control circuit 12e. The power supply circuit 10 is connected in order of a smoothing capacitor 12d, a power module 12a, a transformer 12b, a plurality of diodes 12c, and a smoothing capacitor 12d from the voltage input side to the output side. The control circuit 12e transmits a switching signal to the switching elements constituting the power module 12a. Then, power is converted by the switching operation of the power module 12a. At this time, the power supply circuit 10 generates noise along with the switching operation of the power module 12a.

図５はインバータの回路図である。インバータの入力側には、直流電源を供給するためのバッテリが接続される。インバータの出力側には、インバータの出力電力により回転力を得るモータが接続されている。そして、インバータは、スイッチ群１３ａを有している。スイッチ群１３ａは、モジュール化されたパワー半導体素子により構成されている。そして、制御回路１３ｂからの制御信号に基づき、スイッチ群１３ａに含まれるスイッチのオン、オフが切り替わり、電力が変換される。このとき、スイッチ群１３ａに含まれるスイッチのオン、オフに伴い、電源回路１０はノイズを発生する。 FIG. 5 is a circuit diagram of the inverter. A battery for supplying DC power is connected to the input side of the inverter. A motor that obtains rotational force from the output power of the inverter is connected to the output side of the inverter. The inverter has a switch group 13a. The switch group 13a is composed of modularized power semiconductor elements. Based on the control signal from the control circuit 13b, the switches included in the switch group 13a are switched on and off, and the power is converted. At this time, the power supply circuit 10 generates noise as the switches included in the switch group 13a are turned on and off.

図１及び図２に戻り、冷却部材２０は電源回路１０を冷却する。冷却部材２０には例えばヒートシンクが用いられる。電源回路１０は、回路内の損失箇所で熱を発生する。冷却部材２０は、電源回路１０の損失箇所で発生する熱を冷却している。冷却部材２０は、電源回路１０と絶縁された状態で、電源回路１０の底面に沿うように配置されている。なお、電源回路１０と冷却部材２０との間は、例えば絶縁シートを入れることで、絶縁性を確保してもよい。 Returning to FIGS. 1 and 2, the cooling member 20 cools the power supply circuit 10. For example, a heat sink is used as the cooling member 20. The power supply circuit 10 generates heat at a loss point in the circuit. The cooling member 20 cools the heat generated at the loss point of the power supply circuit 10. The cooling member 20 is disposed along the bottom surface of the power supply circuit 10 while being insulated from the power supply circuit 10. Insulation may be ensured between the power supply circuit 10 and the cooling member 20 by inserting an insulating sheet, for example.

絶縁部材３０は冷却部材２０と筐体４０との間で絶縁を保ちつつ、冷却部材２０を筐体４０内で支持するための部材である。絶縁部材３０は例えば樹脂により形成されており、直方体の形状になるよう形成されている。絶縁部材３０は抵抗成分を有している。絶縁部材３０に抵抗成分をもたせるためには、導電性グリスを用いればよい。導電性グリスを用いることで、冷却部材２０と筐体４０との間において、熱伝導性を確保でき、電気的な絶縁も確保できる。また、導電性グリスの量を調整することで、抵抗成分の抵抗値を調整できる。絶縁部材３０は冷却部材２０の底面に沿うように配置されている。また絶縁部材３０は筐体４０の内側の表面上に配置されている。絶縁部材３０の底面は、例えば接着剤により筐体４０に固定されている。なお、冷却部材２０、絶縁部材３０及び筐体４０の間は、例えば絶縁性のボルトにより締結されることで、固定されてもよい。 The insulating member 30 is a member for supporting the cooling member 20 in the housing 40 while maintaining insulation between the cooling member 20 and the housing 40. The insulating member 30 is made of, for example, resin and is formed in a rectangular parallelepiped shape. The insulating member 30 has a resistance component. In order to give the insulating member 30 a resistance component, conductive grease may be used. By using conductive grease, thermal conductivity can be secured between the cooling member 20 and the housing 40, and electrical insulation can be secured. Further, the resistance value of the resistance component can be adjusted by adjusting the amount of the conductive grease. The insulating member 30 is disposed along the bottom surface of the cooling member 20. The insulating member 30 is disposed on the inner surface of the housing 40. The bottom surface of the insulating member 30 is fixed to the housing 40 by, for example, an adhesive. In addition, between the cooling member 20, the insulating member 30, and the housing | casing 40 may be fixed by fastening with an insulating volt | bolt, for example.

筐体４０は、電源回路１０、冷却部材２０、及ぶ絶縁部材３０を収容している。筐体４０は、金属等で形成されており、導電性を有している。 The housing 40 houses the power supply circuit 10, the cooling member 20, and the insulating member 30. The housing 40 is made of metal or the like and has conductivity.

次に、図６を用いて、電源回路１０、冷却部材２０、絶縁部材３０、及び筐体４０の電気的な接続状態を説明する。図６は各部材の接続状態を回路図で表している。電源回路１０と冷却部材２０との間は、例えば絶縁シートを狭持させることで絶縁されているが、電源回路１０と冷却部材２０との間には容量成分が形成されている。そのため、電源回路１０で発生したノイズは、電源回路１０と冷却部材２０との間の結合容量を介して冷却部材２０に伝搬する。 Next, the electrical connection state of the power supply circuit 10, the cooling member 20, the insulating member 30, and the housing 40 will be described with reference to FIG. FIG. 6 is a circuit diagram showing the connection state of each member. The power supply circuit 10 and the cooling member 20 are insulated by, for example, sandwiching an insulating sheet, but a capacitive component is formed between the power supply circuit 10 and the cooling member 20. Therefore, the noise generated in the power supply circuit 10 propagates to the cooling member 20 through the coupling capacitance between the power supply circuit 10 and the cooling member 20.

図７に、ノイズの周波数に対するインピーダンス特性を示す。インピーダンスは、冷却部材２０と筐体４０との間のインピーダンスである。グラフａは、冷却部材２０と筐体４０との間に絶縁部材３０を設けることなく、冷却部材２０と筐体４０との間が電気的に導通している場合の特性を示す。グラフｂは、冷却部材２０と筐体４０との間に絶縁部材３０を設けた場合の特性を示す。グラフｃは、冷却部材２０と筐体４０との間に絶縁部材３０を設け、かつ、絶縁部材３０に抵抗成分をもたせた場合の特性を示す。 FIG. 7 shows impedance characteristics with respect to noise frequency. The impedance is an impedance between the cooling member 20 and the housing 40. Graph a shows characteristics when the insulating member 30 is not provided between the cooling member 20 and the housing 40 and the cooling member 20 and the housing 40 are electrically connected. Graph b shows the characteristics when the insulating member 30 is provided between the cooling member 20 and the housing 40. Graph c shows characteristics when the insulating member 30 is provided between the cooling member 20 and the housing 40 and the insulating member 30 is provided with a resistance component.

グラフａに示すように、冷却部材２０と筐体４０との間に絶縁部材３０を設けていない場合には、周波数帯域ｆ_Ａ内で、インピーダンスが低くなっている。特に周波数（ｆ_Ａ１）に対するインピーダンスが低くなっている。そのため、周波数（ｆ_Ａ１）付近の周波数をもつノイズが、冷却部材２０から筐体４０に伝搬する。 As shown in the graph a, if between the cooling member 20 and the housing 40 is not provided with an insulating member 30 is in the frequency band f _A, the impedance is low. In particular, the impedance with respect to the frequency (f _A1 ) is low. Therefore, noise having a frequency near the frequency (f _A1 ) propagates from the cooling member 20 to the housing 40.

一方、グラフｂに示すように、冷却部材２０と筐体４０との間に絶縁部材３０を設けた場合には、周波数帯域ｆ_Ａに対するインピーダンスが高くなる。そのため、グラフａと比較して、冷却部材２０から筐体４０へのノイズ伝搬が抑制される。しかしながら、グラフｂでは、インピーダンスの低い帯域（ｆ_Ｂ）が存在する。そのため、周波数帯域（ｆ_Ｂ）内の周波数をもつノイズが、冷却部材２０から筐体４０に伝搬するおそれがある。 On the other hand, as shown in the graph b, and the case of providing the insulating member 30 between the cooling member 20 and the housing 40, the impedance is high relative to the frequency band f _A. Therefore, noise propagation from the cooling member 20 to the housing 40 is suppressed as compared with the graph a. However, in the graph b, there is a low impedance band (f _B ). Therefore, noise having a frequency within the frequency band (f _B ) may propagate from the cooling member 20 to the housing 40.

グラフｃでは、絶縁部材３０が抵抗成分を有しているため、周波数帯域（ｆ_Ｂ）に対するインピーダンスがグラフｂよりも高くなる。そのため、周波数帯域（ｆ_Ａ）に加えて、周波数帯域（ｆ_Ｂ）におけるノイズ伝搬も抑制できる。 In the graph c, since the insulating member 30 has a resistance component, the impedance with respect to the frequency band (f _B ) is higher than that in the graph b. Therefore, in addition to the frequency band _{(f A),} the noise propagation can be suppressed in the frequency band _{(f B).}

本実施形態では、電源回路１０と冷却部材２０とを筐体４０に収容し、絶縁部材３０を、冷却部材２０と筐体４０との間に設けている。これにより、電源回路１０で発生するノイズが筐体４０へ伝搬することを抑制できる。 In the present embodiment, the power supply circuit 10 and the cooling member 20 are accommodated in the housing 40, and the insulating member 30 is provided between the cooling member 20 and the housing 40. Thereby, it can suppress that the noise which generate | occur | produces in the power supply circuit 10 propagates to the housing | casing 40. FIG.

また、本実施形態では、絶縁部材３０を、冷却部材２０と筐体４０との間に設けることで、ノイズ伝搬を抑制できるため、部品点数を減少でき、装置の小型化を実現できる。また、高価な素子を必要としないため、コストも抑制できる。 Moreover, in this embodiment, since the noise propagation can be suppressed by providing the insulating member 30 between the cooling member 20 and the housing 40, the number of parts can be reduced and the apparatus can be downsized. Moreover, since an expensive element is not required, cost can also be suppressed.

また本実施形態において絶縁部材３０は抵抗成分を有している。これにより、高い周波数をもつノイズが電源回路１０から筐体４０へ伝搬することを抑制できる。 In the present embodiment, the insulating member 30 has a resistance component. Thereby, it can suppress that the noise with a high frequency propagates from the power supply circuit 10 to the housing | casing 40. FIG.

上記の絶縁部材３０が本発明の「第１絶縁部材」に相当する。 The insulating member 30 corresponds to the “first insulating member” of the present invention.

《第２実施形態》
本発明の他の実施形態に係る電源装置を説明する。本例では、上述した第１実施形態に対して、冷却部材２０を複数の絶縁部材３１で支持している点、及び、導電部材５１及び絶縁部材３２を備える点が異なる。これ以外の構成は上述した第１実施形態と同じであり、その記載を援用する。 << Second Embodiment >>
A power supply device according to another embodiment of the present invention will be described. This example is different from the above-described first embodiment in that the cooling member 20 is supported by a plurality of insulating members 31 and that the conductive member 51 and the insulating member 32 are provided. Other configurations are the same as those in the first embodiment described above, and the description thereof is incorporated.

図８は電力変換装置１の斜視図である。図９は図８のIX−IX線に沿う断面図である。電力変換装置１は、電源回路１０、冷却部材２０、絶縁部材３１、絶縁部材３２、筐体４０、及び導電部材５１を備えている。絶縁部材３１は、冷却部材２０を筐体４０内で支持するための部材である。絶縁部材３１は、冷却部材２０の底面における角の部分で、冷却部材２０と筐体４０との間に設けられている。そのため、冷却部材２０と筐体４０との間には、隙間（空気層）が形成されている。 FIG. 8 is a perspective view of the power conversion device 1. 9 is a cross-sectional view taken along line IX-IX in FIG. The power conversion device 1 includes a power supply circuit 10, a cooling member 20, an insulating member 31, an insulating member 32, a housing 40, and a conductive member 51. The insulating member 31 is a member for supporting the cooling member 20 in the housing 40. The insulating member 31 is a corner portion on the bottom surface of the cooling member 20 and is provided between the cooling member 20 and the housing 40. Therefore, a gap (air layer) is formed between the cooling member 20 and the housing 40.

導電部材５１は導電性をもった金属の板状の部材である。導電部材５１の長手方向の一端は冷却部材２０に接続されており、導電部材５１の長手方向の他端は絶縁部材３２に支持されている。導電部材５１は、導電部材５１と冷却部材２０との接続部分から、導電部材５１と絶縁部材３２との支持部分に向けて延在するように形成されている。そして、導電部材５１の延在方向が長手方向となる。 The conductive member 51 is a metal plate-like member having conductivity. One end in the longitudinal direction of the conductive member 51 is connected to the cooling member 20, and the other end in the longitudinal direction of the conductive member 51 is supported by the insulating member 32. The conductive member 51 is formed so as to extend from a connection portion between the conductive member 51 and the cooling member 20 toward a support portion between the conductive member 51 and the insulating member 32. The extending direction of the conductive member 51 is the longitudinal direction.

絶縁部材３２は導電部材５１と筐体４０との間に設けられている。絶縁部材３２は導電部材５１を筐体４０内で支持するための部材である。導電部材５１の底面の一部と、筐体４０の内側の表面との間に所定の隙間を空けた状態で、導電部材５１は絶縁部材３２に支持されている。 The insulating member 32 is provided between the conductive member 51 and the housing 40. The insulating member 32 is a member for supporting the conductive member 51 in the housing 40. The conductive member 51 is supported by the insulating member 32 with a predetermined gap between a part of the bottom surface of the conductive member 51 and the inner surface of the housing 40.

図１０は図９のX線で囲う部分の拡大図である。図１０に示すように、導電部材５１の他端、絶縁部材３２、及び筐体４０は、締結部材６０により締結されてている。締結部材６０にはボルト等が用いられる。 FIG. 10 is an enlarged view of a portion surrounded by the X-ray in FIG. As shown in FIG. 10, the other end of the conductive member 51, the insulating member 32, and the housing 40 are fastened by a fastening member 60. A bolt or the like is used for the fastening member 60.

ここで、導電部材５１の長手方向の長さＬ_１について説明する。導電部材５１の長さは、ノイズの周波数に応じて設定されている長さである。電源回路１０で発生したノイズが冷却部材２０に伝搬する。冷却部材２０内を伝搬するノイズは、固有の周波数で大きくなる。そして、固有の周波数は、冷却部材２０の寸法（言い替えると形状）により決まる。すなわち、冷却部材２０に発生するノイズは冷却部材２０の寸法に応じた周波数をもつ。 The following describes the longitudinal length L ₁ of the conductive member 51. The length of the conductive member 51 is a length set according to the frequency of noise. Noise generated in the power supply circuit 10 propagates to the cooling member 20. Noise propagating in the cooling member 20 increases at a specific frequency. The inherent frequency is determined by the size (in other words, the shape) of the cooling member 20. That is, the noise generated in the cooling member 20 has a frequency corresponding to the size of the cooling member 20.

導電部材５１の他端は絶縁部材３２に接続されている。そのため、冷却部材２０内を伝搬するノイズが、導電部材５１の長手方向に向かって流れると、ノイズは導電部材５１の他端で反射する。そのため、導電部材５１の長さＬ_１を、抑制の対象となるノイズの波長に応じて設計することで、導電部材５１を伝搬するノイズを打ち消すことができる。具体的には、導電部材５１の長手方向の長さＬ_１は以下の式（１）を満たすように設計されている。 The other end of the conductive member 51 is connected to the insulating member 32. Therefore, when noise propagating through the cooling member 20 flows in the longitudinal direction of the conductive member 51, the noise is reflected at the other end of the conductive member 51. Therefore, the length L ₁ of the conductive member 51, by designing in accordance with the wavelength of the noise to be suppressed, it is possible to cancel the noise that propagates through the conductive member 51. Specifically, the length L ₁ in the longitudinal direction of the conductive member 51 is designed to satisfy the following formula (1).

ただし、Ｎは自然数である。λは冷却部材２０の寸法に応じて、冷却部材２０で発生するノイズの波長である。

However, N is a natural number. λ is the wavelength of noise generated in the cooling member 20 according to the size of the cooling member 20.

図１１は、式（１）において、Ｎ＝１とした場合のノイズの抑制効果を説明するための図である。図１１（ａ）は冷却部材２０と導電部材５１と間の、ノイズの伝搬を概念的に表した図である。図１１（ｂ）はノイズ電圧の時間特性を示すグラフである。ノイズは、図１１（ａ）冷却部材２０内で、導電部材５１に向かって流れる。そして、ノイズは導電部材５１に流れて、導電部材５１の端部で反射し、冷却部材２０に向かう。ここまでのノイズの流れが、図１１（ａ）の実線の矢印で示される。導電部材５１の端部で反射した後、ノイズは、図１１（ａ）の点線の矢印で示されるように、冷却部材２０内を伝搬する。なお、図１１（ｂ）の横軸は時間を、縦軸は電圧を示している。電圧はノイズの大きさに相当する。また、グラフａは導電部材５１を設けない場合に、冷却部材２０内を伝搬するノイズの特性を示している。グラフｂは導電部材５１を設けた場合に、冷却部材２０内を伝搬するノイズの特性を示している。周期Ｔはノイズの波長（λ）と、導電部材５１内におけるノイズの伝搬速度により決まる。 FIG. 11 is a diagram for explaining the effect of suppressing noise when N = 1 in Equation (1). FIG. 11A is a diagram conceptually illustrating the propagation of noise between the cooling member 20 and the conductive member 51. FIG. 11B is a graph showing the time characteristics of the noise voltage. The noise flows toward the conductive member 51 in the cooling member 20 in FIG. The noise flows through the conductive member 51, is reflected at the end of the conductive member 51, and travels toward the cooling member 20. The flow of noise up to this point is indicated by a solid line arrow in FIG. After being reflected at the end of the conductive member 51, the noise propagates through the cooling member 20 as indicated by the dotted arrow in FIG. In FIG. 11B, the horizontal axis indicates time, and the vertical axis indicates voltage. The voltage corresponds to the magnitude of noise. Graph a shows the characteristics of noise propagating in the cooling member 20 when the conductive member 51 is not provided. Graph b shows the characteristics of noise propagating in the cooling member 20 when the conductive member 51 is provided. The period T is determined by the noise wavelength (λ) and the propagation speed of noise in the conductive member 51.

図１１により、導電部材５１を設けない場合には、特定の周波数（１／Ｔ）をもつノイズが発生している。一方、長手方向の長さＬ_１をλ／４とした導電部材５１を設けることで、特定の周波数（１／Ｔ）のノイズが減衰している。 According to FIG. 11, when the conductive member 51 is not provided, noise having a specific frequency (1 / T) is generated. On the other hand, by providing the conductive member 51 in the longitudinal direction length L ₁ and lambda / 4, noise of a specific frequency (1 / T) is attenuated.

図１２は、式（１）において、Ｎ＝３とした場合のノイズの抑制効果を説明するための図である。図１２（ａ）は冷却部材２０と導電部材５１と間の、ノイズの伝搬を概念的に表した図である。図１２（ｂ）はノイズ電圧の時間特性を示すグラフである。なお、図１２（ａ）に示す矢印は、図１１（ａ）と同様に、ノイズの伝搬を表している。図１２（ｂ）の横軸は時間を、縦軸は電圧を示している。電圧はノイズの大きさに相当する。また、グラフａは導電部材５１を設けない場合に、冷却部材２０内を伝搬するノイズの特性を示している。グラフｂは導電部材５１を設けた場合に、冷却部材２０内を伝搬するノイズの特性を示している。 FIG. 12 is a diagram for explaining the noise suppression effect when N = 3 in Equation (1). FIG. 12A is a diagram conceptually illustrating the propagation of noise between the cooling member 20 and the conductive member 51. FIG. 12B is a graph showing the time characteristics of the noise voltage. In addition, the arrow shown to Fig.12 (a) represents noise propagation similarly to Fig.11 (a). In FIG. 12B, the horizontal axis indicates time, and the vertical axis indicates voltage. The voltage corresponds to the magnitude of noise. Graph a shows the characteristics of noise propagating in the cooling member 20 when the conductive member 51 is not provided. Graph b shows the characteristics of noise propagating in the cooling member 20 when the conductive member 51 is provided.

図１１に示す場合と同様に、長手方向の長さＬ_１を３λ／４とした導電部材５１を設けることで、特定の周波数のノイズが減衰している。 As in the case shown in FIG. 11, by providing the conductive member 51 in the longitudinal direction length L ₁ and 3 [lambda] / 4, noise of a specific frequency is attenuated.

上記のとおり、本実施形態では、冷却部材２０に導電部材５１を接続し、導電部材５１と筐体４０との間で絶縁部材３２により導電部材５１を支持する。これにより、冷却部材２０の固有の周波数をもつノイズを抑制できる。また、絶縁部材３２又は導電部材５１の形状を調整することで、冷却部材２０の固有の周波数に合わせて抑制するノイズの周波数を変化できる。 As described above, in this embodiment, the conductive member 51 is connected to the cooling member 20, and the conductive member 51 is supported by the insulating member 32 between the conductive member 51 and the housing 40. Thereby, the noise with the specific frequency of the cooling member 20 can be suppressed. Further, by adjusting the shape of the insulating member 32 or the conductive member 51, the frequency of noise to be suppressed can be changed in accordance with the specific frequency of the cooling member 20.

また本実施形態において、冷却部材２０は、筐体４０との間で空気層を形成しつつ、絶縁部材３２により筐体４０に支持されている。第１実施形態の図７で示したインピーダンス特性は、冷却部材２０と筐体４０との間に形成される結合容量の大きさでも異なる。そのため、例えば、第１実施形態のように、冷却部材２０の底面を覆うように絶縁部材３０を設けた場合に、冷却部材２０と筐体４０との間の結合容量が大きくなり、インピーダンスの低い部分が、抑制したい所望の周波数帯域に入る可能性がある。このような場合には、本実施形態のように、冷却部材２０と筐体４０との間に空気層を形成することで、冷却部材２０と筐体４０との間の結合容量が低くなる。そして、インピーダンスの低い部分の周波数特性が調整されて、インピーダンスの低い部分を抑制したい周波数帯域から避けることができる。 In the present embodiment, the cooling member 20 is supported by the casing 40 by the insulating member 32 while forming an air layer with the casing 40. The impedance characteristic shown in FIG. 7 of the first embodiment is different also in the magnitude of the coupling capacity formed between the cooling member 20 and the housing 40. Therefore, for example, when the insulating member 30 is provided so as to cover the bottom surface of the cooling member 20 as in the first embodiment, the coupling capacity between the cooling member 20 and the housing 40 increases, and the impedance is low. There is a possibility that the portion falls in a desired frequency band to be suppressed. In such a case, the coupling capacity between the cooling member 20 and the housing 40 is reduced by forming an air layer between the cooling member 20 and the housing 40 as in the present embodiment. And the frequency characteristic of the low impedance part is adjusted, and it can avoid from the frequency band which wants to suppress a low impedance part.

なお本実施形態の変形例として、図１３（ａ）に示すように、導電部材５１は、長さ（２λ／４）の第１導電部５１ａと、長さ（λ／４）の第２導電部５１ｂとで構成されてもよい。図１３（ａ）は冷却部材２０と導電部材５１と間の、ノイズの伝搬を概念的に表した図である。 As a modification of the present embodiment, as shown in FIG. 13A, a conductive member 51 includes a first conductive portion 51a having a length (2λ / 4) and a second conductive portion having a length (λ / 4). The unit 51b may be used. FIG. 13A is a diagram conceptually illustrating the propagation of noise between the cooling member 20 and the conductive member 51.

第１導電部５１ａは、冷却部材２０との接続点から分岐点までの長さが、２λ／４になるよう、構成されている。第２導電部５１ｂは、分岐点から開放端までの長さがλ／４になるよう構成されている。また第１導電部５１ａと第２導電部５１ｂとの接続点が分岐点となり、第１導電部５１ａと第２導電部５１ｂの端部は冷却部材２０に接続されている。第１導電部５１ａ及び第２導電部５１ｂは一体で形成されている。 The first conductive portion 51a is configured so that the length from the connection point with the cooling member 20 to the branch point is 2λ / 4. The second conductive portion 51b is configured such that the length from the branch point to the open end is λ / 4. The connection point between the first conductive part 51 a and the second conductive part 51 b is a branch point, and the end parts of the first conductive part 51 a and the second conductive part 51 b are connected to the cooling member 20. The first conductive part 51a and the second conductive part 51b are integrally formed.

図１３（ｂ）はノイズ電圧の時間特性を示すグラフである。なお図１３（ｂ）の横軸は時間を、縦軸は電圧を示している。電圧はノイズの大きさに相当する。また、グラフａは導電部材５１を設けない場合に、冷却部材２０内を伝搬するノイズの特性を示している。グラフｂは導電部材５１を設けた場合に、冷却部材２０内を伝搬するノイズの特性を示している。そして、図１３（ｂ）に示すように、導電部材５１を設けることで、特定の周波数のノイズが減衰している。 FIG. 13B is a graph showing the time characteristics of the noise voltage. In FIG. 13B, the horizontal axis indicates time, and the vertical axis indicates voltage. The voltage corresponds to the magnitude of noise. Graph a shows the characteristics of noise propagating in the cooling member 20 when the conductive member 51 is not provided. Graph b shows the characteristics of noise propagating in the cooling member 20 when the conductive member 51 is provided. And as shown in FIG.13 (b), the noise of a specific frequency is attenuate | damping by providing the electrically-conductive member 51. FIG.

なお、導電部材５１が延在する方向は、図８に示す方向（紙面の右方向）に限らず、例えば反対方向（紙面の左方向）でもよい。 Note that the direction in which the conductive member 51 extends is not limited to the direction shown in FIG.

上記の絶縁部材３１が本発明の「第１絶縁部材」に相当し、絶縁部材３２が本発明の「第２絶縁部材」に相当し、導電部材５１が本発明の「第１導電部材」に相当する。 The insulating member 31 corresponds to the “first insulating member” of the present invention, the insulating member 32 corresponds to the “second insulating member” of the present invention, and the conductive member 51 corresponds to the “first conductive member” of the present invention. Equivalent to.

《第３実施形態》
本発明の他の実施形態に係る電源装置を説明する。本例では、上述した第２実施形態に対して、絶縁部材３２と筐体４０との間に、導電部材５２を設ける点が異なる。これ以外の構成は上述した第２実施形態と同じであり、その記載を援用する。 << Third Embodiment >>
A power supply device according to another embodiment of the present invention will be described. In this example, the point which provides the electrically-conductive member 52 differs between the insulating member 32 and the housing | casing 40 with respect to 2nd Embodiment mentioned above. Other configurations are the same as those of the second embodiment described above, and the description thereof is incorporated.

図１４は電力変換装置１の斜視図である。電力変換装置１は、電源回路１０、冷却部材２０、絶縁部材３１、絶縁部材３２、筐体４０、導電部材５１、及び導電部材５２を備えている。導電部材５２は、導電部材５１と筐体４０との間に設けられ、絶縁部材３２を支持するための部材である。導電部材５２は直方体状に形成されており、導電部材５２の下面は筐体４０の内側の表面に固定されている。導電部材５２の上面は絶縁部材３２の表面に固定されている。 FIG. 14 is a perspective view of the power conversion device 1. The power conversion device 1 includes a power supply circuit 10, a cooling member 20, an insulating member 31, an insulating member 32, a housing 40, a conductive member 51, and a conductive member 52. The conductive member 52 is a member that is provided between the conductive member 51 and the housing 40 and supports the insulating member 32. The conductive member 52 is formed in a rectangular parallelepiped shape, and the lower surface of the conductive member 52 is fixed to the inner surface of the housing 40. The upper surface of the conductive member 52 is fixed to the surface of the insulating member 32.

図１５に、導電部材５１、絶縁部材３２、導電部材５２、及び筐体４０の接続部分を示す。図１５は当該接続部分の断面図である。導電部材５１、絶縁部材３２、導電部材５２、及び筐体４０は締結部材６０により締結されている。また、絶縁部材３２の厚さ又は導電部材５２の厚さが大きいほど、導電部材５１と筐体４０との間の間隔が広くなる。また、絶縁部材３２の厚さ又は導電部材５２の厚さが大きいほど、冷却部材２０と筐体４０との間の間隔も大きくなる。 FIG. 15 shows a connection portion of the conductive member 51, the insulating member 32, the conductive member 52, and the housing 40. FIG. 15 is a cross-sectional view of the connection portion. The conductive member 51, the insulating member 32, the conductive member 52, and the housing 40 are fastened by a fastening member 60. Further, the larger the thickness of the insulating member 32 or the conductive member 52, the wider the gap between the conductive member 51 and the housing 40. Further, the greater the thickness of the insulating member 32 or the conductive member 52, the greater the distance between the cooling member 20 and the housing 40.

次に、図１６を用いて、電力変換装置１を構成する各部材の電気的な接続状態を説明する。図１６は各部材の接続状態を回路図で表している。図１６に示すように、冷却部材２０と筐体４０との間には、結合容量（Ｃｒ）が形成される。絶縁部材３２を設けることで、冷却部材２０と筐体４０との間の間隔が大きくなるため、結合容量（Ｃｒ）が小さくなる。また、第２実施形態と比較した場合に、絶縁部材３２を設ける分、結合容量（Ｃｒ）が小さくなる。これにより、冷却部材２０から筐体４０へ伝搬するノイズを抑制できる。また、各部材のレイアウトの自由度を拡大できる。 Next, the electrical connection state of each member which comprises the power converter device 1 is demonstrated using FIG. FIG. 16 is a circuit diagram showing the connection state of each member. As shown in FIG. 16, a coupling capacity (Cr) is formed between the cooling member 20 and the housing 40. By providing the insulating member 32, the distance between the cooling member 20 and the housing 40 is increased, so that the coupling capacity (Cr) is decreased. Further, when compared with the second embodiment, the coupling capacity (Cr) is reduced by providing the insulating member 32. Thereby, the noise which propagates from the cooling member 20 to the housing | casing 40 can be suppressed. Moreover, the freedom degree of the layout of each member can be expanded.

なお、本実施形態の変形例について、図１７を用いて説明する。図１７は変形例に係る電力変換装置の斜視図である。図１７に示すように、冷却部材２０の表面のうち、表面積が小さい側面が筐体４０と対向しつつ、当該側面が絶縁部材３１を介して筐体４０に支持されるように、冷却部材２０が配置されてもよい。冷却部材２０が直方体状に形成され、冷却部材２０の表面の面積が上面及び下面で最も高くなる場合には、側面が絶縁部材３１を介して筐体４０に支持されればよい。これにより、冷却部材２０と筐体４０の対向する面の面積が小さくなるため、冷却部材と筐体間の結合容量（Ｃｒ）が小さくなる。その結果として、冷却部材２０から筐体４０へ伝搬するノイズを抑制できる。 A modification of the present embodiment will be described with reference to FIG. FIG. 17 is a perspective view of a power converter according to a modification. As shown in FIG. 17, among the surfaces of the cooling member 20, the cooling member 20 has a side surface with a small surface area facing the housing 40 and is supported by the housing 40 via an insulating member 31. May be arranged. When the cooling member 20 is formed in a rectangular parallelepiped shape and the surface area of the cooling member 20 is the highest on the upper surface and the lower surface, the side surface may be supported by the housing 40 via the insulating member 31. Thereby, since the area of the surface which the cooling member 20 and the housing | casing 40 oppose becomes small, the coupling capacity (Cr) between a cooling member and a housing | casing becomes small. As a result, noise propagating from the cooling member 20 to the housing 40 can be suppressed.

上記の導電部材５２が本発明の「第２導電部材」に相当する。
《第４実施形態》
本発明の他の実施形態に係る電源装置を説明する。本例では、上述した第２実施形態に対して、複数の電源回路１１、１２及び導電部材５３を設ける点が異なる。また、筐体４０に対向する冷却部材２０の面の向き、及び、筐体４０に対向する導電部材５１の面の向きも異なる。筐体４０に対向する冷却部材２０の面、及び、筐体４０に対向する導電部材５１の面は、筐体４０に支持されている面である。これ以外の構成は上述した第２実施形態と同じであり、第１〜第３実施形態の記載を適宜、援用する。 The conductive member 52 corresponds to the “second conductive member” of the present invention.
<< 4th Embodiment >>
A power supply device according to another embodiment of the present invention will be described. This example is different from the second embodiment described above in that a plurality of power supply circuits 11 and 12 and a conductive member 53 are provided. Further, the orientation of the surface of the cooling member 20 facing the housing 40 and the orientation of the surface of the conductive member 51 facing the housing 40 are also different. The surface of the cooling member 20 facing the housing 40 and the surface of the conductive member 51 facing the housing 40 are surfaces supported by the housing 40. Other configurations are the same as those of the second embodiment described above, and the descriptions of the first to third embodiments are incorporated as appropriate.

図１８は電力変換装置１の斜視図である。電力変換装置１は、複数の電源回路１１、１２、冷却部材２０、絶縁部材３１、絶縁部材３２、筐体４０、導電部材５１、及び導電部材５３を備えている。導電部材５３は導電性をもった金属の板状の部材である。導電部材５３の一端は電源回路１１に接続され、導電部材５３の他端は電源回路１２に接続されている。 FIG. 18 is a perspective view of the power conversion device 1. The power conversion device 1 includes a plurality of power supply circuits 11 and 12, a cooling member 20, an insulating member 31, an insulating member 32, a housing 40, a conductive member 51, and a conductive member 53. The conductive member 53 is a metal plate-like member having conductivity. One end of the conductive member 53 is connected to the power supply circuit 11, and the other end of the conductive member 53 is connected to the power supply circuit 12.

例えば、電力変換装置がバッテリとモータとの間に接続された場合に、電源回路１１はバッテリの電圧を昇圧する昇圧回路として機能する。電源回路１１により昇圧された電力は、導電部材５３を介して、電源回路１２に入力される。電源回路１２は、入力された直流を交流に変換する変換回路として機能する。そして、電源回路１２により変換された電力がモータに出力される。なお、複数の電源回路１１、１２は、昇圧回路及びインバータに限らず、他の回路でもよい。 For example, when the power conversion device is connected between a battery and a motor, the power supply circuit 11 functions as a booster circuit that boosts the voltage of the battery. The electric power boosted by the power supply circuit 11 is input to the power supply circuit 12 through the conductive member 53. The power supply circuit 12 functions as a conversion circuit that converts input direct current into alternating current. Then, the electric power converted by the power supply circuit 12 is output to the motor. The plurality of power supply circuits 11 and 12 are not limited to the booster circuit and the inverter, but may be other circuits.

図１９に、電力変換装置１を構成する各部材の電気的な接続状態を説明する。図１９は各部材の接続状態を回路図で表している。複数の電源回路１１、１２と冷却部材２０との間は、それぞれ結合容量が形成される。 In FIG. 19, the electrical connection state of each member which comprises the power converter device 1 is demonstrated. FIG. 19 is a circuit diagram showing the connection state of each member. A coupling capacitor is formed between the plurality of power supply circuits 11 and 12 and the cooling member 20.

本実施形態では、複数の電源回路１１、１２が導電部材５３に接続されている。そのため、複数の電源回路１１、１２、導電部材５３、及び冷却部材２０で形成されるループのインピーダンスが小さくなる。これにより、電源回路１１、１２で発生するノイズが冷却部材２０から筐体４０へ伝搬することを抑制できる。 In the present embodiment, the plurality of power supply circuits 11 and 12 are connected to the conductive member 53. Therefore, the impedance of the loop formed by the plurality of power supply circuits 11 and 12, the conductive member 53, and the cooling member 20 is reduced. Thereby, it can suppress that the noise which generate | occur | produces in the power supply circuits 11 and 12 propagates from the cooling member 20 to the housing | casing 40. FIG.

さらに、本実施形態では、冷却部材２０と筐体４０との間が絶縁部材３１により支持されている。導電部材５１の端部が、絶縁部材３２を介して筐体４０に支持されている。導電部材５１の長手方向の長さは、第１実施形態の式１を満たすように設計されている。これにより、電源回路１１、１２で発生するノイズが筐体４０へ伝搬することを抑制できる。 Furthermore, in this embodiment, the space between the cooling member 20 and the housing 40 is supported by the insulating member 31. An end portion of the conductive member 51 is supported by the housing 40 via the insulating member 32. The length in the longitudinal direction of the conductive member 51 is designed so as to satisfy Formula 1 of the first embodiment. Thereby, it can suppress that the noise which generate | occur | produces in the power supply circuits 11 and 12 propagates to the housing | casing 40. FIG.

なお、電源回路１１、１２は、冷却部材２０の同じ表面上に設けなくてもよい、電源回路１１、１２は、冷却部材２０の異なる表面上にそれぞれ設けられてもよい。 The power supply circuits 11 and 12 may not be provided on the same surface of the cooling member 20. The power supply circuits 11 and 12 may be provided on different surfaces of the cooling member 20, respectively.

上記の導電部材５３が本発明の「第３導電部材」に相当する。 The conductive member 53 corresponds to the “third conductive member” of the present invention.

《第５実施形態》
本発明の他の実施形態に係る電源装置を説明する。本例では、上述した第１実施形態に対して、複数の電源回路１１、１２、複数の冷却部材２１、２２、複数の絶縁部材３３、３４、導電部材５３、５４を設ける点が異なる。これ以外の構成は上述した第１実施形態と同じであり、第１〜第４実施形態の記載を適宜、援用する。 << 5th Embodiment >>
A power supply device according to another embodiment of the present invention will be described. This example is different from the first embodiment described above in that a plurality of power supply circuits 11 and 12, a plurality of cooling members 21 and 22, a plurality of insulating members 33 and 34, and conductive members 53 and 54 are provided. Other configurations are the same as those of the first embodiment described above, and the descriptions of the first to fourth embodiments are incorporated as appropriate.

図２０は電力変換装置１の断面図である。電力変換装置１は、複数の電源回路１１、１２、複数の冷却部材２１、２２、複数の絶縁部材３３、３４、筐体４０、及び導電部材５３、５４を備えている。冷却部材２１は電源回路１１を冷却する。冷却部材２２は電源回路１２を冷却する。冷却部材２１は、電源回路１１と絶縁された状態で、電源回路１１の底面に沿うように配置されている。冷却部材２２は、冷却部材２１と同様に、電源回路１２の底面に沿うように配置されている。 FIG. 20 is a cross-sectional view of the power conversion device 1. The power conversion apparatus 1 includes a plurality of power supply circuits 11 and 12, a plurality of cooling members 21 and 22, a plurality of insulating members 33 and 34, a housing 40, and conductive members 53 and 54. The cooling member 21 cools the power supply circuit 11. The cooling member 22 cools the power supply circuit 12. The cooling member 21 is disposed along the bottom surface of the power supply circuit 11 while being insulated from the power supply circuit 11. The cooling member 22 is disposed along the bottom surface of the power supply circuit 12, similarly to the cooling member 21.

絶縁部材３３は、冷却部材２１と筐体４０との間で絶縁を保ちつつ、冷却部材２１を筐体４０内で支持するための部材である。また、絶縁部材３４は、冷却部材２２と筐体４０との間で絶縁を保ちつつ、冷却部材２２を筐体４０内で支持するための部材である。なお、冷却部材２１、２２の形状、材料等は第１実施形態で説明した冷却部材２０と同様である。また、絶縁部材３３、３４の形状、材料等は第１実施形態で説明した絶縁部材３０と同様である。 The insulating member 33 is a member for supporting the cooling member 21 in the housing 40 while maintaining insulation between the cooling member 21 and the housing 40. The insulating member 34 is a member for supporting the cooling member 22 in the housing 40 while maintaining insulation between the cooling member 22 and the housing 40. The shape, material, and the like of the cooling members 21 and 22 are the same as those of the cooling member 20 described in the first embodiment. Further, the shape, material, and the like of the insulating members 33 and 34 are the same as those of the insulating member 30 described in the first embodiment.

導電部材５４は導電性をもった金属の板状の部材である。導電部材５４の一端は冷却部材２１に接続され、導電部材５４の他端は冷却部材２２に接続されている。 The conductive member 54 is a metal plate-like member having conductivity. One end of the conductive member 54 is connected to the cooling member 21, and the other end of the conductive member 54 is connected to the cooling member 22.

図２１に、電力変換装置１を構成する各部材の電気的な接続状態を説明する。図２１は各部材の接続状態を回路図で表している。複数の電源回路１１、１２と冷却部材２０との間は、それぞれ結合容量が形成される。また、複数の電源回路１１、１２は導電部材５３により接続され、冷却部材２１、２２は導電部材５４により接続されている。そのため、複数の電源回路１１、１２、導電部材５３、５４、及び冷却部材２１、２２で形成されるループのインピーダンスが小さくなる。これにより、電源回路１１、１２で発生するノイズが冷却部材２１、２２から筐体４０へ伝搬することを抑制できる。 In FIG. 21, the electrical connection state of each member which comprises the power converter device 1 is demonstrated. FIG. 21 is a circuit diagram showing the connection state of each member. A coupling capacitor is formed between the plurality of power supply circuits 11 and 12 and the cooling member 20. The plurality of power supply circuits 11 and 12 are connected by a conductive member 53, and the cooling members 21 and 22 are connected by a conductive member 54. Therefore, the impedance of the loop formed by the plurality of power supply circuits 11 and 12, the conductive members 53 and 54, and the cooling members 21 and 22 is reduced. Thereby, it can suppress that the noise which generate | occur | produces in the power supply circuits 11 and 12 propagates from the cooling members 21 and 22 to the housing | casing 40. FIG.

上記の導電部材５４が本発明の「第４導電部材」に相当し、絶縁部材３３、３４が本発明の「第１絶縁部材」に相当する。 The conductive member 54 corresponds to the “fourth conductive member” of the present invention, and the insulating members 33 and 34 correspond to the “first insulating member” of the present invention.

《第６実施形態》
本発明の他の実施形態に係る電源装置を説明する。本例では、上述した第１実施形態に対して、複数の電源回路１１、１２、複数の冷却部材２１、２２、複数の絶縁部材３５〜３８、導電部材５５〜５７を設ける点が異なる。これ以外の構成は上述した第３実施形態と同じであり、第１〜第５実施形態の記載を適宜、援用する。 << 6th Embodiment >>
A power supply device according to another embodiment of the present invention will be described. This example is different from the first embodiment described above in that a plurality of power supply circuits 11 and 12, a plurality of cooling members 21 and 22, a plurality of insulating members 35 to 38, and conductive members 55 to 57 are provided. Other configurations are the same as those of the third embodiment described above, and the descriptions of the first to fifth embodiments are incorporated as appropriate.

図２２は電力変換装置１の斜視図である。図２３は図２２のXXIII-XXIII線に沿う断面図である。電力変換装置１は、複数の電源回路１１、１２、複数の冷却部材２１、２２、複数の絶縁部材３５〜３８、筐体４０、及び導電部材５５〜５７を備えている。電源回路１１、１２、冷却部材２１、２２、及び導電部材５３の構成は第５実施形態と同様である。 FIG. 22 is a perspective view of the power conversion device 1. 23 is a cross-sectional view taken along line XXIII-XXIII in FIG. The power conversion device 1 includes a plurality of power supply circuits 11 and 12, a plurality of cooling members 21 and 22, a plurality of insulating members 35 to 38, a housing 40, and conductive members 55 to 57. The configurations of the power supply circuits 11 and 12, the cooling members 21 and 22, and the conductive member 53 are the same as those in the fifth embodiment.

絶縁部材３５は、冷却部材２１を筐体４０内で支持するための部材である。また、絶縁部材３６は、冷却部材２２を筐体４０内で支持するための部材である。絶縁部材３５は、第２実施形態の絶縁部材３１と同様に、冷却部材２１の底面における角の部分で、冷却部材２１と筐体４０との間に設けられている。絶縁部材３６は、第２実施形態の絶縁部材３１と同様に、冷却部材２２の底面における角の部分で、冷却部材２２と筐体４０との間に設けられている。 The insulating member 35 is a member for supporting the cooling member 21 in the housing 40. The insulating member 36 is a member for supporting the cooling member 22 in the housing 40. The insulating member 35 is provided between the cooling member 21 and the housing 40 at the corner portion on the bottom surface of the cooling member 21, similarly to the insulating member 31 of the second embodiment. The insulating member 36 is provided between the cooling member 22 and the housing 40 at a corner portion on the bottom surface of the cooling member 22, similarly to the insulating member 31 of the second embodiment.

導電部材５５、５６は導電性をもった金属の板状の部材である。導電部材５５の長手方向の一端は冷却部材２１に接続されており、導電部材５５の長手方向の他端は絶縁部材３７を介して導電部材５７に接続されている。導電部材５６の長手方向の一端は冷却部材２２に接続されており、導電部材５６の長手方向の他端は絶縁部材３８を介して導電部材５７に接続されている。導電部材５５、５６の長手方向の長さ、第１実施形態で示した式１を満たすように設計されている。これにより、冷却部材２１、２２から導電部材５５、５６にそれぞれ伝搬するノイスを、導電部材５５、５６の端部でそれぞれ反射させて、ノイズを打ち消すことができる。 The conductive members 55 and 56 are metal plate-like members having conductivity. One end in the longitudinal direction of the conductive member 55 is connected to the cooling member 21, and the other end in the longitudinal direction of the conductive member 55 is connected to the conductive member 57 via the insulating member 37. One end in the longitudinal direction of the conductive member 56 is connected to the cooling member 22, and the other end in the longitudinal direction of the conductive member 56 is connected to the conductive member 57 via the insulating member 38. The length of the conductive members 55 and 56 in the longitudinal direction is designed so as to satisfy the expression 1 shown in the first embodiment. Thereby, the noise propagated from the cooling members 21 and 22 to the conductive members 55 and 56 is reflected by the end portions of the conductive members 55 and 56, respectively, and noise can be canceled out.

絶縁部材３７は樹脂により形成され、導電部材５５の端部と導電部材５７との間に狭持されている。絶縁部材３８は樹脂により形成され、導電部材５６の端部と導電部材５７との間に狭持されている。導電部材５７は、複数の絶縁部材３７、３７と筐体４０との間に設けられており、導電部材５６、５７及び絶縁部材３７、３８を筐体４０内で支持するための部材である。 The insulating member 37 is made of resin and is sandwiched between the end of the conductive member 55 and the conductive member 57. The insulating member 38 is made of resin and is sandwiched between the end of the conductive member 56 and the conductive member 57. The conductive member 57 is provided between the plurality of insulating members 37, 37 and the housing 40, and is a member for supporting the conductive members 56, 57 and the insulating members 37, 38 within the housing 40.

図２４に、電力変換装置１を構成する各部材の電気的な接続状態を説明する。図２４は各部材の接続状態を回路図で表している。複数の電源回路１１、１２と冷却部材２０との間は、それぞれ結合容量が形成される。そのため、複数の電源回路１１、１２で発生するノイズは冷却部材２１、２２に伝搬する。 In FIG. 24, the electrical connection state of each member which comprises the power converter device 1 is demonstrated. FIG. 24 is a circuit diagram showing the connection state of each member. A coupling capacitor is formed between the plurality of power supply circuits 11 and 12 and the cooling member 20. Therefore, noise generated in the plurality of power supply circuits 11 and 12 propagates to the cooling members 21 and 22.

本実施形態では、冷却部材２１、２２と筐体４０との間が絶縁部材３５、３６により支持されている。導電部材５６、５７の端部が、絶縁部材３７、３８に接続されている。これにより、電源回路１１、１２で発生するノイズが筐体４０へ伝搬することを抑制できる。 In the present embodiment, the space between the cooling members 21 and 22 and the housing 40 is supported by the insulating members 35 and 36. End portions of the conductive members 56 and 57 are connected to the insulating members 37 and 38. Thereby, it is possible to suppress the noise generated in the power supply circuits 11 and 12 from propagating to the housing 40.

上記の絶縁部材３７、３８が本発明の「複数の第３絶縁部材」に相当し、導電部材５５、５６が本発明の「複数の第４導電部材」に相当し、導電部材５７が本発明の「第５導電部材」に相当する。 The insulating members 37 and 38 correspond to “a plurality of third insulating members” of the present invention, the conductive members 55 and 56 correspond to “a plurality of fourth conductive members” of the present invention, and the conductive member 57 of the present invention. Corresponds to “a fifth conductive member”.

《第７実施形態》
本発明の他の実施形態に係る電源装置を説明する。本例では、上述した第５実施形態に対して、複数の筐体４１、４２及び導電部材５８を設ける点が異なる。これ以外の構成は上述した第５実施形態と同じであり、第１〜第６実施形態の記載を適宜、援用する。 << 7th Embodiment >>
A power supply device according to another embodiment of the present invention will be described. This example is different from the fifth embodiment described above in that a plurality of casings 41 and 42 and a conductive member 58 are provided. Other configurations are the same as those of the fifth embodiment described above, and the descriptions of the first to sixth embodiments are incorporated as appropriate.

図２５は電力変換装置１の断面図である。電力変換装置１は、複数の電源回路１１、１２、複数の冷却部材２１、２２、複数の絶縁部材３３、３４、複数の筐体４１、４２、及び導電部材５３、５４、５８を備えている。筐体４１は、電源回路１１、冷却部材２１、絶縁部材３３を収容している。筐体４２は、電源回路１２、冷却部材２２、絶縁部材３４を収容している。筐体４１と筐体４２は、独立した筐体である。 FIG. 25 is a cross-sectional view of the power conversion device 1. The power conversion apparatus 1 includes a plurality of power supply circuits 11 and 12, a plurality of cooling members 21 and 22, a plurality of insulating members 33 and 34, a plurality of casings 41 and 42, and conductive members 53, 54, and 58. . The housing 41 houses the power supply circuit 11, the cooling member 21, and the insulating member 33. The housing 42 accommodates the power supply circuit 12, the cooling member 22, and the insulating member 34. The housing 41 and the housing 42 are independent housings.

導電部材５８は、導電性をもった部材である。導電部材５８は、筐体４１と筐体４２との間に接続されている。筐体４１は、電源回路１１等を収容した状態でグランド電位に接地されている。筐体４２は、電源回路１２等を収容した状態で、グランド電位に接地されている。電力変換装置１を車両に設ける場合には、筐体４１及び筐体４２は車体に接地されている。筐体４１と筐体４２との間は、車体を介して接続された状態になる。導電部材５８は、車体と筐体４１、４２との間を接地させる接地線、及び、車体に相当する。 The conductive member 58 is a member having conductivity. The conductive member 58 is connected between the housing 41 and the housing 42. The casing 41 is grounded to the ground potential in a state where the power supply circuit 11 and the like are accommodated. The casing 42 is grounded to the ground potential in a state where the power supply circuit 12 and the like are accommodated. When the power conversion device 1 is provided in a vehicle, the housing 41 and the housing 42 are grounded to the vehicle body. The housing 41 and the housing 42 are connected via a vehicle body. The conductive member 58 corresponds to a ground wire that grounds the vehicle body and the casings 41 and 42 and the vehicle body.

図２６に、電力変換装置１を構成する各部材の電気的な接続状態を説明する。図２１は各部材の接続状態を回路図で表している。筐体４１と筐体４２との間は、導電部材５８により接続されている。そのため、電源回路１１、１２で発生したノイズが筐体４１、４２を介して、車体に伝搬した場合には、車載の電気機器に影響を与えてしまう。 In FIG. 26, the electrical connection state of each member which comprises the power converter device 1 is demonstrated. FIG. 21 is a circuit diagram showing the connection state of each member. The casing 41 and the casing 42 are connected by a conductive member 58. For this reason, when noise generated in the power supply circuits 11 and 12 propagates to the vehicle body via the casings 41 and 42, the on-vehicle electric device is affected.

本実施形態では、冷却部材２１と筐体４１との間に絶縁部材３３が設けられており、冷却部材２２と筐体４２との間には絶縁部材３４が設けられている。また、電源回路１１と電源回路１２との間が導電部材５３により接続されており、冷却部材２１と冷却部材２２との間が導電部材５４により接続されている。そのため、複数の電源回路１１、１２、導電部材５３、５４、及び冷却部材２１、２２により、ループが形成され、ノイズは当該ループ内を伝搬する。これにより、ノイズが冷却部材２１、２から筐体４１、４２へ伝搬することを抑制できる。さらに、筐体４１と筐体４２との間が接続されているため、冷却性能も高めることができる。 In the present embodiment, an insulating member 33 is provided between the cooling member 21 and the housing 41, and an insulating member 34 is provided between the cooling member 22 and the housing 42. The power supply circuit 11 and the power supply circuit 12 are connected by a conductive member 53, and the cooling member 21 and the cooling member 22 are connected by a conductive member 54. Therefore, a loop is formed by the plurality of power supply circuits 11 and 12, the conductive members 53 and 54, and the cooling members 21 and 22, and noise propagates in the loop. Thereby, it can suppress that noise propagates from the cooling members 21 and 2 to the housings 41 and 42. Furthermore, since the housing | casing 41 and the housing | casing 42 are connected, cooling performance can also be improved.

上記の筐体４１が本発明の「第１筐体」に相当し、上記の筐体４２が本発明の「第２筐体」に相当する。 The casing 41 corresponds to the “first casing” of the present invention, and the casing 42 corresponds to the “second casing” of the present invention.

《第８実施形態》
本発明の他の実施形態に係る電源装置を説明する。本例では、上述した第６実施形態に対して、複数の筐体４１、４２及び導電部材５８を設ける点が異なる。これ以外の構成は上述した第６実施形態と同じであり、第１〜第７実施形態の記載を適宜、援用する。 << Eighth Embodiment >>
A power supply device according to another embodiment of the present invention will be described. This example is different from the above-described sixth embodiment in that a plurality of housings 41 and 42 and a conductive member 58 are provided. The other configuration is the same as that of the above-described sixth embodiment, and the description of the first to seventh embodiments is incorporated as appropriate.

図２７は電力変換装置１の斜視図である。図２８は図２７のXXVIII- XXVIII線に沿う断面図である。電力変換装置１は、複数の電源回路１１、１２、複数の冷却部材２１、２２、複数の絶縁部材３５〜３８、複数の筐体４１、４２、及び導電部材５５〜５７を備えている。筐体４１は、電源回路１１、冷却部材２１、絶縁部材３５を収容している。筐体４２は、電源回路１２、冷却部材２２、絶縁部材３６を収容している。 FIG. 27 is a perspective view of the power conversion device 1. 28 is a cross-sectional view taken along line XXVIII-XXVIII in FIG. The power conversion apparatus 1 includes a plurality of power supply circuits 11 and 12, a plurality of cooling members 21 and 22, a plurality of insulating members 35 to 38, a plurality of casings 41 and 42, and conductive members 55 to 57. The housing 41 houses the power supply circuit 11, the cooling member 21, and the insulating member 35. The housing 42 accommodates the power supply circuit 12, the cooling member 22, and the insulating member 36.

図２９に、電力変換装置１を構成する各部材の電気的な接続状態を説明する。図２１は各部材の接続状態を回路図で表している。筐体４１と筐体４２との間は、電気的に接続されている。 In FIG. 29, the electrical connection state of each member which comprises the power converter device 1 is demonstrated. FIG. 21 is a circuit diagram showing the connection state of each member. The housing 41 and the housing 42 are electrically connected.

本実施形態では、第７実施形態と同様に、筐体４１、４２へのノイズ伝搬を抑制できるように構成されている。そのため、筐体４１と筐体４２との間が電気的に接続された状態でも、ノイズの漏洩を抑制できる。 In the present embodiment, similarly to the seventh embodiment, noise propagation to the casings 41 and 42 can be suppressed. Therefore, leakage of noise can be suppressed even when the housing 41 and the housing 42 are electrically connected.

なお、本実施形態の変形例について、図３０を用いて説明する。図３０は変形例に係る電力変換装置の斜視図である。電源回路１１、１２、冷却部材２１、２２、絶縁部材３５、３６、及び筐体４１、４２をそれぞれ複数の部材で構成した場合に、各部材は図３０に示すように配置されてもよい。図３０では、冷却部材２１、２２の表面のうち、表面積が小さい側面が筐体４１、４２と対向しつつ、当該側面が絶縁部材３５、３６を介して筐体４１、４２にそれぞれ支持されるように、構成されている。なお、電源回路１１、１２は、互いに向き合うように冷却部材２１、２２の表面に設けられているが、冷却部材２１、２２を形成する表面のうち、当該表面（図３０において、冷却部材２１、２２が設けられている面）とは異なる面に設けられていてもよい。 A modification of the present embodiment will be described with reference to FIG. FIG. 30 is a perspective view of a power converter according to a modification. When the power supply circuits 11 and 12, the cooling members 21 and 22, the insulating members 35 and 36, and the casings 41 and 42 are each composed of a plurality of members, each member may be arranged as shown in FIG. In FIG. 30, of the surfaces of the cooling members 21 and 22, the side surface having a small surface area faces the housings 41 and 42, and the side surfaces are supported by the housings 41 and 42 via the insulating members 35 and 36, respectively. It is configured as such. The power supply circuits 11 and 12 are provided on the surfaces of the cooling members 21 and 22 so as to face each other, but among the surfaces forming the cooling members 21 and 22, the surfaces (in FIG. 22 may be provided on a different surface.

１０〜１２…電源回路
２０〜２２…冷却部材
３０〜３８…絶縁部材
４０〜４２…筐体
５１〜５７…導電部材 DESCRIPTION OF SYMBOLS 10-12 ... Power supply circuit 20-22 ... Cooling member 30-38 ... Insulating member 40-42 ... Case 51-57 ... Conductive member

Claims

A switching circuit;
A cooling member for cooling the switching circuit;
A housing that houses the switching circuit and the cooling member;
A power supply apparatus comprising: a first insulating member that is provided between the cooling member and the housing and supports the cooling member.

The power supply device according to claim 1, wherein
The power supply apparatus, wherein the first insulating member has a resistance component.

The power supply device according to claim 1 or 2,
A first conductive member connected to the cooling member;
A power supply apparatus comprising: a second insulating member that is provided between the first conductive member and the housing and supports the first conductive member.

The power supply device according to claim 3, wherein
The first conductive member is formed to extend from a connection portion connected to the cooling member to a support portion supported by the second insulating member,
A power supply device satisfying the following formula 1.

However, L ₁ is the extending direction of the length of the first conductive member, N is a natural number, lambda is the wavelength of the noise to be suppressed.

The power supply device according to claim 3 or 4,
A second conductive member provided between the first conductive member and the housing and supporting the second insulating member;
The power supply device, wherein the second insulating member is supported by the housing via the second conductive member.

In the power supply device according to any one of claims 1 to 5,
A third conductive member;
The switching circuit includes a first switching circuit and a second switching circuit,
One end of the third conductive member is connected to the first switching circuit,
The other end of the third conductive member is connected to the second switching circuit.

In the power supply device according to any one of claims 1 to 5,
A third conductive member;
A fourth conductive member;
The switching circuit includes a first switching circuit and a second switching circuit,
The cooling member includes a first cooling member that cools the first switching circuit, and a second cooling member that cools the second switching circuit,
The first insulating member supports the first cooling member and the second cooling member by a plurality of insulating members,
One end of the third conductive member is connected to the first switching circuit,
The other end of the third conductive member is connected to the second switching circuit,
One end of the fourth conductive member is connected to the first cooling member,
The other end of the fourth conductive member is connected to the second cooling member.

In the power supply device according to any one of claims 1 to 5,
A third conductive member;
A plurality of fourth conductive members connected to the cooling member;
A plurality of third insulating members;
A fifth conductive member;
The switching circuit includes a first switching circuit and a second switching circuit,
The cooling member includes a first cooling member that cools the first switching circuit, and a second cooling member that cools the second switching circuit,
The first insulating member supports the first cooling member and the second cooling member by a plurality of insulating members,
One end of the third conductive member is connected to the first switching circuit,
The other end of the third conductive member is connected to the second switching circuit,
One of the plurality of fourth conductive members has one end connected to the first cooling member, and the other fourth conductive member has one end connected to the second cooling member,
The other end of the one fourth conductive member and the other end of the other fourth conductive member are connected to the fifth conductive member via the third insulating member,
The fifth conductive member supports the plurality of third insulating members between the plurality of third insulating members and the housing, respectively.

The power supply device according to claim 8, wherein
The fourth conductive member is formed to extend from a connection portion connected to the cooling member to a connection portion connected to the third insulating member;
The power supply device characterized by satisfying the following formula (2).

However, L ₂ is the extending direction of the length of the 4 conductive members, N is a natural number, lambda is the wavelength of the noise to be suppressed.

In the power supply device according to any one of claims 7 to 9,
The housing has a first housing and a second housing,
The first housing accommodates one member of the first switching circuit, the first cooling member, and the plurality of insulating members,
The power supply device, wherein the second housing accommodates the second switching circuit, the second cooling member, and the other member among the plurality of insulating members.