JP7322835B2 - power converter - Google Patents

Description

The disclosure provided herein relates to power converters.

Patent Literature 1 describes a power converter including a semiconductor module, a smoothing capacitor unit, a control board, and a case for housing them.

JP 2012-157161 A

Radiation noise output from each of the semiconductor module and the smoothing capacitor unit may enter the control board.

Accordingly, an object of the present disclosure is to provide a power conversion device in which radiation noise is suppressed from entering the substrate.

A power converter according to one aspect of the present disclosure includes:
a first electrical component (340) and a second electrical component (311) aligned in one direction;
a substrate (500) aligned with the first electrical component in an orthogonal direction orthogonal to one direction;
a support (370) provided between the first electrical component and the substrate on which the substrate is mounted, comprising a first material having a magnetic permeability higher than that of air;
a case (600, 700) containing a second material having a magnetic permeability higher than that of air and housing the first electrical component, the second electrical component, the substrate, and the support portion in the storage space (1000);
a projecting portion (730) extending in the orthogonal direction from the inner surface (710a) of the case on the storage space side and provided between the substrate and the second electrical component,
The storage space is divided into a first space (1001) for housing the board and a second space (1002) for housing the first and second electrical components by the supporting portion and the protruding portion.

According to this, the radiation noise output from the first electric component (340) toward the substrate (500) is suppressed by the supporting portion (370) and the protruding portion (730). Particularly in the orthogonal direction, the support portion (370) suppresses the radiation noise output from the first electrical component (340) toward the substrate (500) from entering the substrate (500).

Also, the radiation noise output from the second electrical component (311) toward the substrate (500) is suppressed by the supporting portion (370) and the protruding portion (730). In particular, the projecting portion (730) suppresses the radiation noise output from the second electrical component (311) toward the substrate (500) in one direction from entering the substrate (500).

It should be noted that the reference numbers in parentheses above merely indicate the correspondence with the configurations described in the embodiments described later, and do not limit the technical scope in any way.

It is a circuit diagram explaining an in-vehicle system. It is a top view explaining a power converter. FIG. 3 is a top view of the power conversion device excluding a second case shown in FIG. 2; FIG. 4 is a top view of the power conversion device with the substrate shown in FIG. 3 removed; FIG. 5 is a top view of the power converter with brackets shown in FIG. 4 removed; 3 is a cross-sectional view of the power converter taken along line VI-VI shown in FIG. 2; FIG. FIG. 3 is a cross-sectional view of the power converter taken along line VII-VII shown in FIG. 2;

A plurality of modes for carrying out the present disclosure will be described below with reference to the drawings. In each form, the same reference numerals may be given to the parts corresponding to the matters described in the preceding form, and overlapping explanations may be omitted. When only a part of the configuration is described in each form, the previously described other forms can be applied to other parts of the configuration.

In addition, not only combinations of parts that are explicitly stated that combinations are possible in each embodiment, but also embodiments, embodiments and modifications, even if not explicitly stated, as long as there is no particular problem with the combination. And it is also possible to partially combine the modifications.

(First embodiment)
First, based on FIG. 1, the vehicle-mounted system 100 provided with the power converter 300 will be described. This in-vehicle system 100 constitutes a system for an electric vehicle. The in-vehicle system 100 has a battery 200 , a power conversion device 300 , a motor 400 and a board 500 .

A plurality of ECUs (not shown) are mounted on the board 500 . These multiple ECUs transmit and receive signals to and from each other via bus wiring. A plurality of ECUs cooperate to control the electric vehicle. A plurality of ECUs control regeneration and power running of motor 400 according to the SOC of battery 200 . SOC is an abbreviation for state of charge. ECU is an abbreviation for electronic control unit.

Battery 200 has a plurality of secondary batteries. These secondary batteries constitute a battery stack connected in series. The SOC of this battery stack corresponds to the SOC of battery 200 . A lithium-ion secondary battery, a nickel-hydrogen secondary battery, an organic radical battery, or the like can be used as the secondary battery.

<Power converter>
Power conversion device 300 performs power conversion between battery 200 and motor 400 as an inverter. The power conversion device 300 converts the DC power of the battery 200 into AC power. The power conversion device 300 converts AC power generated by power generation (regeneration) of the motor 400 into DC power.

Motor 400 is connected to an output shaft of an electric vehicle (not shown). The rotational energy of motor 400 is transmitted to the running wheels of the electric vehicle via the output shaft. Conversely, the rotational energy of the running wheels is transmitted to motor 400 via the output shaft.

The motor 400 is driven by AC power supplied from the power converter 300 . As a result, a driving force is applied to the running wheels. Also, the motor 400 is regenerated by rotational energy transmitted from the running wheels. The AC power generated by this regeneration is converted into DC power by the power conversion device 300 . This DC power is supplied to battery 200 . The DC power is also supplied to various electrical loads mounted on the electric vehicle.

The power conversion device 300 includes a plurality of semiconductor elements such as switches, which will be described later. A plurality of semiconductor elements are covered with a resin member 360 to configure the switch module 340 . In this embodiment, an n-channel IGBT is used as the switch. However, MOSFETs can be used instead of IGBTs for these switches. If a MOSFET is used as the switch, the diode may be omitted. Note that the switch module 340 corresponds to the first electrical component.

Further, these semiconductor elements can be manufactured from semiconductors such as Si and wide-gap semiconductors such as SiC. The constituent material of the semiconductor element is not particularly limited.

<Electrical connection of the power converter>
The power conversion device 300 is electrically connected to the battery 200 via a first power supply busbar 301 and a second power supply busbar 302 . Power converter 300 has capacitor 310 , U-phase leg 331 , V-phase leg 332 and W-phase leg 333 . Capacitor 310 and U-phase leg 331 to W-phase leg 333 are connected between first power supply bus bar 301 and second power supply bus bar 302, respectively.

Capacitor 310 is a smoothing capacitor that smoothes pulsating current that occurs when alternating current is rectified to direct current. Capacitor 310 has two electrodes. One electrode of these two electrodes is connected to the first power supply bus bar 301 . The other electrode of these two electrodes is connected to the second power supply bus bar 302 .

Each of U-phase leg 331 to W-phase leg 333 has two switches connected in series. Each of the U-phase leg 331 to W-phase leg 333 has a high-side switch 321 and a low-side switch 322 as switches. Each of the U-phase leg 331 to W-phase leg 333 has a high-side diode 321a and a low-side diode 322a as diodes.

As shown in FIG. 1, the collector electrode of the high side switch 321 is connected to the first power supply busbar 301 . An emitter electrode of the high side switch 321 and a collector electrode of the low side switch 322 are connected. An emitter electrode of the low-side switch 322 is connected to the second power supply busbar 302 . Thereby, the high side switch 321 and the low side switch 322 are serially connected in order from the first power supply bus bar 301 toward the second power supply bus bar 302 .

The collector electrodes of the high side switches 321 are connected to the cathode electrodes of the high side diodes 321a. The emitter electrodes of these high-side switches 321 are connected to the anode electrodes of high-side diodes 321a. Thus, the high-side diode 321 a is connected in anti-parallel to the high-side switch 321 .

Similarly, the collector electrodes of these low-side switches 322 are connected to the cathode electrodes of low-side diodes 322a. An anode electrode of a low-side diode 322a is connected to each emitter electrode of these low-side switches 322 . Thus, the low side diode 322 a is connected in anti-parallel to the low side switch 322 .

Furthermore, a U-phase bus bar 410 is connected to the midpoint between the high-side switch 321 and the low-side switch 322 provided on the U-phase leg 331 . U-phase bus bar 410 is connected to a U-phase stator coil of motor 400 .

A V-phase bus bar 420 is connected to a midpoint between the high-side switch 321 and the low-side switch 322 of the V-phase leg 332 . V-phase bus bar 420 is connected to a V-phase stator coil of motor 400 .

A W-phase bus bar 430 is connected to a midpoint between the high-side switch 321 and the low-side switch 322 provided on the W-phase leg 333 . W-phase bus bar 430 is connected to a W-phase stator coil of motor 400 .

When the motor 400 is powered, the high-side switch 321 and the low-side switch 322 of the U-phase leg 331 to W-phase leg 333 are PWM-controlled by control signals from the ECU. Thereby, a three-phase alternating current is generated in the power conversion device 300 . When the motor 400 generates (regenerates) power, the ECU stops outputting the control signal, for example. As a result, AC power generated by power generation of motor 400 passes through diodes provided in U-phase leg 331 to W-phase leg 333 . As a result, AC power is converted to DC power.

<Mechanical Configuration of Power Converter>
Next, the mechanical configuration of the power converter 300 will be described. Accordingly, the three directions that are orthogonal to each other are hereinafter referred to as the x-direction, the y-direction, and the z-direction. The x direction corresponds to one direction. The y direction corresponds to the alignment direction. The z-direction corresponds to the orthogonal direction. Note that the description of "direction" is omitted in the drawings. In the drawings, the battery 200 is abbreviated as "BATT". The substrate 500 is abbreviated as "CB".

Power converter 300 has capacitor 310, U-phase leg 331 to W-phase leg 333, first power supply bus bar 301, and second power supply bus bar 302, as described above. The power conversion device 300 also has a capacitor case 311 , a bracket 370 , an urging body 390 , a first case 600 and a second case 700 in addition to the components described above.

Note that the capacitor 310 is housed in a capacitor case 311 . The capacitor case 311 corresponds to the second electrical component. Bracket 370 corresponds to the support.

<Switch module>
Each of the U-phase leg 331 to W-phase leg 333 described above is resin-sealed with a resin member 360 . A part of a collector terminal (not shown) connected to the collector electrode of the high-side switch 321 is exposed from the resin member 360 . A part of an emitter terminal (not shown) connected to the emitter electrode of the low-side switch 322 is exposed from the resin member 360 . A portion of the plurality of signal terminals 351 connected to the gate electrodes of the high-side switch 321 and the low-side switch 322 are partially exposed from the resin member 360 .

A switch module 340 is configured by the resin member 360 , the collector terminal, the emitter terminal, and the plurality of signal terminals 351 . The three-phase switch modules 340 are arranged in order of U-phase, V-phase, and W-phase from a second wall portion 622 to a fourth wall portion 624 of the first case 600, which will be described later. Note that the resin member 360 corresponds to a sealing member.

As shown in FIGS. 6 and 7, the resin member 360 has a flat shape with a thin thickness in the z direction. The resin member 360 has a first resin surface 360a, a second resin surface 360b on the back side thereof, and a connecting resin surface 360c connecting these surfaces, which are spaced apart in the z-direction.

A portion of the plurality of signal terminals 351 is exposed from one of the connecting resin surfaces 360c. A plurality of signal terminals 351 exposed from one of the connecting resin surfaces 360c extend in the x direction away from the connecting resin surface 360c and then extend in the z direction toward the first resin surface 360a.

<Power supply bus bar>
As shown in FIG. 6, the first power supply bus bar 301 and the second power supply bus bar 302 are conductive members that are thin in the z direction. Electric power output from the battery 200 is supplied to the capacitor 310 and the switch module 340 by the first power supply bus bar 301 and the second power supply bus bar 302, respectively. 2 to 7, parts of the first power supply bus bar 301 and the second power supply bus bar 302 connected to the battery 200 are omitted.

<Substrate>
As shown in FIGS. 6 and 7, the substrate 500 has a flat shape with a thin thickness in the z direction. The substrate 500 has a first substrate surface 500a, a second substrate surface 500b on the back side, and a substrate connecting surface 500c connecting these surfaces, which are spaced apart in the z-direction. A plurality of substrate holes 510 are formed in the substrate 500 and open to the first substrate surface 500a and the second substrate surface 500b.

<Condenser case>
A capacitor case 311 is a housing for housing the capacitor 310 . As shown in FIG. 6, the capacitor case 311 has a top surface 311a and a bottom surface 311b aligned in the z direction, and a side surface 311c connecting them. Capacitor 310 is accommodated in a case space defined by top surface 311a, bottom surface 311b, and side surface 311c. One end of each of the first power supply bus bar 301 and the second power supply bus bar 302 is connected to the capacitor 310 .

An opening opening in the y direction is formed in the capacitor case 311 . The other end of each of the first power supply bus bar 301 and the second power supply bus bar 302 is exposed from this opening hole. The exposed other ends of the first power supply bus bar 301 and the second power supply bus bar 302 extend in the y direction away from the capacitor case 311 .

<Bracket>
Bracket 370 is a support for supporting substrate 500 . Bracket 370 includes a first metallic material having a higher permeability than air. As shown in FIGS. 6 and 7, the bracket 370 has a flat shape with a thin thickness in the z direction. The bracket 370 has a first bracket surface 370a on the substrate 500 side, a second bracket surface 370b on the back side, and a bracket connecting surface 370c connecting these surfaces, which are spaced apart in the z-direction. The first metal material corresponds to the first material.

Although not shown, the bracket 370 is formed with a plurality of holes opening in the first bracket surface 370a and the second bracket surface 370b in order to reduce its weight. The first bracket surface 370a corresponds to the first support surface. The second bracket surface 370b corresponds to the second support surface. The bracket connection surface 370c corresponds to a support connection surface.

<Forcing body>
The biasing body 390 is a plate-shaped spring body. The biasing body 390 contains a third metallic material having a magnetic permeability higher than that of air. The biasing body 390 plays a role of applying a biasing force toward the bottom portion 610 to the resin member 360, which will be described later. The third metal material corresponds to the third material.

<First case>
The first case 600 is a housing having a substantially rectangular parallelepiped shape. The first case 600 contains a second metallic material having a magnetic permeability higher than that of air. As shown in FIGS. 6 and 7, the first case 600 has a bottom portion 610 and a first side portion 620 annularly rising from an inner bottom surface 610a, which will be described later. The bottom portion 610 has a flat shape with a thin thickness in the z direction. The first side portion 620 corresponds to the side wall portion. The second metal material corresponds to the second material.

The bottom portion 610 has an inner bottom surface 610a arranged in the z-direction, an outer bottom surface 610b on the back side thereof, and a connecting bottom surface 610c connecting them. In the bottom portion 610, a space defined by an inner bottom surface 610a, an outer bottom surface 610b, and a connecting bottom surface 610c is formed with a coolant channel 611 through which coolant supplied from the outside flows.

In addition to the refrigerant flow path 611, the bottom portion 610 is formed with a plurality of fixing portions 630 extending away from the inner bottom surface 610a. The fixing portion 630 is formed with a recess 637 that is recessed from the tip spaced from the inner bottom surface 610a toward the inner bottom surface 610a.

The first side 620 has a first wall 621 and a third wall 623 spaced apart in the x direction and a second wall 622 and a fourth wall 624 spaced apart in the y direction. ing.

The first wall portion 621, the second wall portion 622, the third wall portion 623, and the fourth wall portion 624 are annularly connected in the circumferential direction around the z direction. Openings are defined at the extremities spaced from the bottoms 610 of these four walls.

<Second case>
The second case 700 is a housing having a substantially rectangular parallelepiped shape. The second case 700 contains a second metallic material having a magnetic permeability higher than that of air. As shown in FIGS. 6 and 7, the second case 700 has an upper portion 710 and a second side portion 720 annularly rising from an inner surface 710a, which will be described later. The upper portion 710 has a flat shape with a thin thickness in the z direction.

The upper portion 710 has an inner surface 710a aligned in the z-direction and an outer surface 710b behind it. The upper portion 710 is formed with a protrusion 730 extending away from the inner surface 710a. The projecting portion 730 extends toward a sixth wall portion 722 and an eighth wall portion 724, which will be described later. One end of the projecting portion 730 is connected to the sixth wall portion 722 . The other end of the projecting portion 730 is connected to the eighth wall portion 724 . The protrusion 730 increases the rigidity of the second case 700 . Note that the protruding portion 730 may not be formed on the upper portion 710 . The projecting portion 730 may be connected to the upper portion 710 .

The second side 720 has a fifth wall 721 and a seventh wall 723 spaced apart in the x direction and a sixth wall 722 and an eighth wall 724 spaced apart in the y direction. ing.

The fifth wall portion 721, the sixth wall portion 722, the seventh wall portion 723, and the eighth wall portion 724 are annularly connected in the circumferential direction around the z direction. Apertures are defined at the extremities spaced from the tops 710 of the four walls.

<Case storage form>
As shown in FIGS. 6 and 7, a first plane 620a spaced from the bottom 610 of the first side 620 and a second plane 720a spaced from the top 710 of the second side 720 face each other in the z direction. , the first case 600 and the second case 700 are connected.

The first wall portion 621 and the fifth wall portion 721 are arranged in the z direction. The second wall portion 622 and the sixth wall portion 722 are arranged in the z direction. The third wall portion 623 and the seventh wall portion 723 are arranged in the z direction. The fourth wall portion 624 and the eighth wall portion 724 are aligned in the z direction. A storage space 1000 is thus defined between the first case 600 and the second case 700 .

The storage space 1000 houses the capacitor case 311 , the switch module 340 , the bracket 370 , the biasing body 390 and the substrate 500 .

A capacitor case 311 is provided on the third wall portion 623 side of the bottom portion 610 . A resin member 360 of the switch module 340 is provided on the first wall portion 621 side of the bottom portion 610 . A capacitor case 311 and a switch module 340 are spaced apart in the x direction and arranged side by side.

Bottom surface 311b of capacitor case 311 is provided on inner bottom surface 610a. A second resin surface 360b of the resin member 360 is provided on the inner bottom surface 610a.

As described above, the three-phase switch modules 340 are arranged from the second wall portion 622 toward the fourth wall portion 624 of the first case 600 in order of U phase, V phase, and W phase. As shown in FIG. 5, a portion of a plurality of signal terminals 351 are exposed from each of these three-phase switch modules 340 . The plurality of signal terminals 351 extend in the x direction away from the connecting resin surface 360c on the first wall portion 621 side, and then extend in the z direction toward the first resin surface 360a. The order in which these three-phase switch modules 340 are arranged is not limited.

2 to 6, the other end of each of the first power supply bus bar 301 and the second power supply bus bar 302 extends from the capacitor case 311 toward the switch module 340 in the x direction. At the end of the resin member 360 on the capacitor case 311 side, a part of a collector terminal and an emitter terminal (not shown) connected to the other ends of the first power supply bus bar 301 and the second power supply bus bar 302 are provided. The other end of the first power supply busbar 301 is connected to the collector terminal. The other end of the second power supply busbar 302 is connected to the emitter terminal.

As shown in FIGS. 5 and 7, the inner bottom surface 610a of the first case 600 is formed with a plurality of fixing portions 630 extending away from the inner bottom surface 610a as described above. As described above, each of the plurality of fixing portions 630 is formed with a recess 637 that is recessed from the tip spaced from the inner bottom surface 610a toward the inner bottom surface 610a.

The plurality of fixing parts 630 has a first fixing part 631 , a second fixing part 632 , a third fixing part 633 , a fourth fixing part 634 , a fifth fixing part 635 and a sixth fixing part 636 . Each of the first fixing portion 631 to the sixth fixing portion 636 is provided on the inner bottom surface 610a clockwise in the circumferential direction around the z direction. The switch module 340 is surrounded by the first fixing portion 631 to the sixth fixing portion 636 in the circumferential direction.

As shown in FIGS. 6 and 7, a biasing body 390 is provided on the first resin surface 360a of the resin member 360. As shown in FIGS. A bracket 370 is provided on the side of the biasing body 390 spaced apart from the first resin surface 360a in the z direction. A biasing body 390 is provided between the resin member 360 and the bracket 370 . A second bracket surface 370b of the bracket 370 is provided on the biasing body 390 side.

As shown in FIGS. 4 and 7, the bracket 370 is formed with a plurality of fastening portions 380 extending away from the bracket connecting surface 370c. A through-hole 387 is formed through each of the plurality of fastening portions 380 in the z-direction. The plurality of fastening portions 380 has a first fastening portion 381 , a second fastening portion 382 , a third fastening portion 383 , a fourth fastening portion 384 , a fifth fastening portion 385 and a sixth fastening portion 386 . The first to sixth fastening portions 381 to 386 are provided on the bracket connecting surface 370c clockwise in the circumferential direction around the z direction.

Specifically, the first fastening portion 381 and the second fastening portion 382 are provided on the first bracket connection surface 370d on the first wall portion 621 side of the bracket connection surface 370c. A third fastening portion 383 is provided on the second bracket connection surface on the second wall portion 622 side of the bracket connection surface 370c. A fourth fastening portion 384 and a fifth fastening portion 385 are provided on a third bracket connection surface 370e on the third wall portion 623 side of the bracket connection surface 370c. A sixth fastening portion 386 is provided on the fourth bracket connection surface on the fourth wall portion 624 side of the bracket connection surface 370c. The first bracket connection surface 370d corresponds to the second support connection surface. The third bracket connection surface 370e corresponds to the first support connection surface.

As shown in FIGS. 4 and 5, the first fastening portion 381 to the sixth fastening portion 386 are aligned with the first fixing portion 631 to the sixth fixing portion 636, respectively, in the z direction. As a result, the through holes 387 formed in each of the first to sixth fastening portions 381 to 386 and the recesses 637 formed in each of the first fixing portions 631 to 636 are communicated in the z direction. there is

As shown in FIG. 7, shafts of bolts 800 are inserted into these communication holes. A shaft portion of the bolt 800 is fastened to a partition wall that partitions the recess 637 . Thereby, bracket 370 is fastened to fixed portion 630 via bolt 800 . In addition, in FIG. 7, the boundary between the first fastening portion 381 and the first bracket connecting surface 370d is indicated by a dashed line. A dashed line indicates the boundary between the fifth fastening portion 385 and the third bracket connecting surface 370e.

Further, the biasing body 390 is pressed against the resin member 360 thereby. Therefore, the biasing force directed toward the bottom portion 610 is applied to the resin member 360 from the biasing body 390 . As a result, the plurality of switches included in the resin member 360 are easily cooled by the coolant flowing through the coolant channel 611 of the bottom portion 610 .

Further, the first bracket surface 370a of the bracket 370 is formed with a plurality of protrusions 377 extending in the z-direction away from the first bracket surface 370a as shown in FIGS. A substrate 500 is provided at the ends of the plurality of protrusions 377 separated from the first bracket surface 370a.

A second substrate surface 500b of the substrate 500 is provided at the tip of the protrusion 377 separated from the first bracket surface 370a. A substrate 500 is provided on the first bracket surface 370a side of the bracket 370 .

Further, as shown in FIGS. 2 and 3, the substrate 500 is formed with a plurality of substrate holes 510 passing through the first substrate surface 500a and the second substrate surface 500b. A plurality of substrate holes 510 are formed in the substrate 500 so as to be aligned in the y direction at the end on the first wall portion 621 side.

In this way, the resin member 360, the biasing body 390, the bracket 370, and the substrate 500 described so far are arranged in the order of the resin member 360, the biasing body 390, the bracket 370, and the substrate 500 from the bottom portion 610 to the upper portion 710. are placed.

A gap is provided between the first bracket connecting surface 370 d and the first wall portion 621 . A plurality of signal terminals 351 extend in the x-direction away from the connecting resin surface 360c on the first wall 621 side through the gap, and then extend in the z-direction toward the substrate 500 .

A plurality of signal terminals 351 extending toward the substrate 500 are passed through a plurality of substrate holes 510 . A plurality of signal terminals 351 passed through a plurality of substrate holes 510 are electrically and mechanically connected to the substrate 500 by solder or the like (not shown).

<First space and second space>
As described above, the upper portion 710 is formed with a protrusion 730 extending in the z-direction away from the inner surface 710a. The protrusion 730 extends in the y-direction from the sixth wall 722 toward the eighth wall 724 and is connected to the sixth wall 722 and the eighth wall 724 . The projecting portion 730 extends in the z-direction toward the first power supply bus bar 301 and the second power supply bus bar 302 connecting the switch module 340 and the capacitor 310 .

6 and 7, the projecting portion 730 is provided between the switch module 340 and the capacitor case 311. As shown in FIGS. Further, the projecting portion 730 faces the substrate connecting surface 500c located on the projecting portion 730 side of the substrate 500 while being spaced apart in the x direction.

Also, as described above, the bracket 370 is provided between the substrate 500 and the resin member 360 .

The storage space 1000 is divided into a first space 1001 and a second space 1002 by the projecting portion 730 and the bracket 370 . A substrate 500 is accommodated in the first space 1001 . Resin member 360 and capacitor case 311 are accommodated in second space 1002 .

The distance in the x direction between the first bracket connecting surface 370d and the first wall portion 621 is larger than the distance in the x direction between the third bracket connecting surface 370e and the projecting portion 730. there is

4 and 7, the distance in the x direction between the first fastening portion 381 and the second fastening portion 382 and the first wall portion 621 is the first bracket connecting surface 370d and the first wall portion. 621 in the x direction.

Further, as shown in FIGS. 2 and 7, the fourth fastening portion 384 and the fifth fastening portion 385 are opposed to the projecting portion 730 in the z-direction.

<Signal terminal and fastening part>
As described above, the first fastening portion 381 and the second fastening portion 382 are connected to the first bracket connection surface 370d. A signal terminal 351 connected to the V-phase leg 332 among the plurality of signal terminals 351 is provided between the first fastening portion 381 and the second fastening portion 382 .

Also, the first fastening portion 381 is fixed to the first fixing portion 631 via a bolt 800 . The second fastening portion 382 is fixed to the second fixing portion 632 via bolts 800 . The first case 600 having these fixing portions 630 is grounded to the vehicle body or the like.

<Effect>
As described above, the storage space 1000 is divided into the first space 1001 and the second space 1002 by the projecting portion 730 and the bracket 370 . A substrate 500 is accommodated in the first space 1001 . A resin member 360 and a capacitor case 311 are accommodated in the second space 1002 .

Therefore, radiation noise output from the resin member 360 is suppressed from entering the substrate 500 by the bracket 370 and the projecting portion 730 . In particular, radiation noise output from the resin member 360 is suppressed from entering the substrate 500 by the bracket 370 .

In addition, radiation noise output from capacitor 310 is suppressed from entering substrate 500 by bracket 370 and projecting portion 730 . In particular, the protrusion 730 suppresses the radiation noise output from the capacitor 310 from entering the substrate 500 .

Furthermore, bracket 370 and projecting portion 730 suppress radiation noise output from first power supply bus bar 301 and second power supply bus bar 302 connecting resin member 360 and capacitor 310 from entering substrate 500 .

As described above, the capacitor case 311 is provided on the bottom portion 610 on the side of the third wall portion 623 . A switch module 340 is provided on the first wall portion 621 side of the bottom portion 610 . A plurality of signal terminals 351 extend toward the substrate 500 through the gap between the first bracket connecting surface 370d and the first wall portion 621. As shown in FIG. A plurality of signal terminals 351 and the substrate 500 are electrically and mechanically connected.

Therefore, radiation noise from the capacitor 310 is suppressed from entering the plurality of signal terminals 351 . Accordingly, current noise is suppressed from entering the substrate 500 from the plurality of signal terminals 351 .

As described above, each of the fourth fastening portion 384 and the fifth fastening portion 385 faces the projecting portion 730 in the z-direction. Therefore, radiation noise from a plurality of electrical components including resin member 360 , capacitor 310 , first power supply bus bar 301 and second power supply bus bar 302 accommodated in second space 1002 is suppressed from entering substrate 500 .

As described above, the signal terminal 351 connected to the V-phase leg 332 among the plurality of signal terminals 351 is provided between the first fastening portion 381 and the second fastening portion 382 .

Therefore, radiation noise radiated from the plurality of electrical components housed in the second space 1002 is radiated from the first fastening portion 381, the second fastening portion 382, the first fixing portion 631, and the second fixing portion 632, respectively. is entered in Radiation noise radiated from electrical components is suppressed from entering the signal terminal 351 connected to the V-phase leg 332 among the plurality of signal terminals 351 .

As described above, biasing body 390 is provided between bracket 370 and resin member 360 . Therefore, radiation noise radiated from the resin member 360 is easily input to the urging body 390 . Intrusion of radiation noise from the resin member 360 to the substrate 500 is suppressed.

(First modification)
Although the substrate 500 connected to the plurality of signal terminals 351 has been shown in the embodiments described so far, a control substrate (not shown) for inputting control signals to the substrate 500 may be provided in the second case 700 . The control substrate may be provided on the first substrate surface 500a side of the substrate 500, and the control substrate and the substrate 500 may be arranged facing each other in the z direction.

(Second modification)
In the embodiments described so far, the three-phase switch module 340 is cooled by the coolant flowing through the coolant channel 611 formed in the bottom portion 610 . However, the switch module 340 may be cooled by a separately provided cooler. The switch module 340 and the cooler may be arranged in a stack, and the resin member 360 may be cooled.

(Other modifications)
In this embodiment, an example in which the power conversion device 300 is included in the vehicle-mounted system 100 for an electric vehicle is shown. However, application of the power converter 300 is not particularly limited to the above example. For example, a configuration in which power conversion device 300 is included in a hybrid system that includes motor 400 and an internal combustion engine may be employed.

In this embodiment, an example in which one motor 400 is connected to the power converter 300 is shown. However, a configuration in which a plurality of motors 400 are connected to power converter 300 can also be adopted. In this case, the power conversion device 300 has a plurality of three-phase switch modules 340 for configuring an inverter.

311...Capacitor case 321...High side switch 322...Low side switch 340...Switch module 351...Signal terminal 360...Resin member 370...Bracket 370a...First bracket surface 370b...Second bracket surface 370c Bracket connection surface 370d First bracket connection surface 370e Third bracket connection surface 381 First fastening portion 382 Second fastening portion 390 Biasing body 500 Substrate 600 First case , 610...Bottom part 610a...Inner bottom face 620...First side part 631...First fixing part 632...Second fixing part 700...Second case 710a...Inner surface 730...Protruding part 1000...Storage space , 1001 ... first space, 1002 ... second space

Claims (6)

a first electrical component (340) and a second electrical component (311) aligned in one direction;
a substrate (500) aligned with the first electrical component in an orthogonal direction orthogonal to the one direction;
a support (370) provided between the first electrical component and the substrate on which the substrate is mounted and comprising a first material having a magnetic permeability higher than that of air;
a case (600, 700) containing a second material having a magnetic permeability higher than that of air and accommodating the first electrical component, the second electrical component, the substrate, and the support portion in a storage space (1000);
a projecting portion (730) extending in the orthogonal direction from an inner surface (710a) of the case on the storage space side and provided between the substrate and the second electrical component,
The storage space is divided into a first space (1001) in which the substrate is stored and a second space (1002) in which the first electrical component and the second electrical component are stored by the support portion and the projecting portion. Sectioned power converters. The first electrical component includes a sealing member (360) sealing a plurality of switches (321, 322), and a plurality of switches (321, 322) having one end connected to the plurality of switches and the other end exposed from the sealing member. and a signal terminal (351) of
The support portion includes a first support surface (370a) on the substrate side and a second support surface (370b) on the sealing member side on the back side of the first support surface, which are spaced apart in the orthogonal direction; a support connection surface (370c) that connects the first support surface and the second support surface;
The support connection surface includes a first support connection surface (370e) on the projection side and a second support connection surface (370d) spaced apart from the projection in the one direction more than the first support connection surface. and
2. The power conversion device according to claim 1, wherein a plurality of said signal terminals pass through a gap between said second support connection surface and said case, extend toward said substrate, and are connected to said substrate. 3. The power converter according to claim 2, wherein a distance between said second support connection surface and said case is longer than a distance between said first support connection surface and said projecting portion. The power converter according to claim 2 or 3, wherein a part of said support extends in said one direction away from said first support connection surface and faces said projecting portion in said orthogonal direction. The support portion has a first fastening portion (381) and a second fastening portion (382) extending in the one direction away from the second support connection surface,
The case has a bottom portion (610) on which the first electrical component and the second electrical component are respectively mounted, a side wall portion (620) rising in the orthogonal direction from an inner bottom surface (610a) of the bottom portion, and Having a first fixing portion (631) to which the first fastening portion is fixed and a second fixing portion (632) to which the second fastening portion is fixed, standing in the orthogonal direction;
5. Any one of claims 2 to 4, wherein a portion of the plurality of signal terminals are provided between the first fastening portion and the second fastening portion in a row direction orthogonal to each of the one direction and the orthogonal direction. The power conversion device according to the item. A power converter according to any one of the preceding claims, comprising a biasing body (390) provided between said support and said first electrical component and comprising a third material having a magnetic permeability higher than that of air. Device.

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