JP2021025832A - Power conversion unit - Google Patents

Abstract

To provide a power conversion unit in which decrease in detection accuracy of a current is suppressed.SOLUTION: A power conversion unit 300 has a power conversion section that converts DC power into AC power. Further, the power conversion unit has a P bus bar 303 and an N bus bar 304 connected to a battery, a U-phase bus bar 561 to a W-phase bus bar 563 connected to a motor, and a current sensor 650 for converting a magnetic field generated from an AC current flowing in a phase bus bar into an electric signal. The phase bus bar and the current sensor face each other in a z direction. Each of the P bus bar, the N bus bar, and the U-phase bus bar to the W-phase bus bar extends in a y direction. The U-phase bus bar to the W-phase bus bar, and the P-bus bar and the N-bus bar are aligned in an x direction.SELECTED DRAWING: Figure 2

Description

The disclosure described herein relates to a power conversion unit having a current sensor.

As shown in Patent Document 1, a current sensor that detects a measured current based on a magnetic field generated from the measured current is known.

Japanese Patent No. 5531213

A magnetic field is generated from the measured current flowing through the current line provided with the current sensor. Similarly, a magnetic field is generated from a current flowing through a different current line. If this magnetic field passes through the current sensor, the accuracy of current detection may decrease.

Therefore, the disclosure described in the present specification is an object of the present invention to provide a power conversion unit in which a decrease in current detection accuracy is suppressed.

One of the disclosures is a first DC connection portion (303) connected to one of the positive electrode and the negative electrode of the DC power supply (200).
A second DC connection (304) connected to the other of the positive and negative electrodes of the DC power supply,
A power conversion unit (531-533, 550) that converts the DC power of the DC power supply input from the first DC connection unit and the second DC connection unit into AC power, and
AC energization units (561 to 563) that connect the power conversion unit and the motor (400) to supply AC power to the motor, and
It has a current sensor (650), which is arranged so as to face the AC current-carrying part and converts a magnetic field generated from an AC current flowing through the AC current-carrying part into an electric signal.
The AC current-carrying part, the first DC connection part, and the second DC connection part each extend in the vertical direction orthogonal to the opposite direction of the AC current-carrying part and the current sensor.
The AC current-carrying portion, the first DC connection portion, and the second DC connection portion are sequentially arranged in the horizontal direction orthogonal to the opposite direction and the vertical direction.

According to this, the first direct current connection portion (303) and the second direct current connection portion (304) in which direct currents flow in opposite directions in the vertical direction are arranged in the horizontal direction. Therefore, the magnetic field generated from the DC current flowing through these two DC connections (303, 304) is strengthened between the two DC connections (303, 304) in the lateral direction.

However, the magnetic field generated by these two DC connections (303, 304) weakens outside between the two DC connections (303, 304) in the lateral direction. The AC current-carrying part (561 to 563) and the current sensor (650) are located at positions where the magnetic field is weakened. Therefore, it is possible to prevent the current sensor (650) from deteriorating the detection accuracy of the alternating current due to the magnetic field generated from the direct current connection portions (303, 304).

It is a circuit diagram which shows an in-vehicle system. It is a schematic diagram for demonstrating the power conversion unit.

Hereinafter, embodiments will be described with reference to the drawings.

(First Embodiment)
<In-vehicle system>
First, an in-vehicle system 100 provided with a power conversion unit 300 will be described with reference to FIG. The in-vehicle system 100 constitutes a system for an electric vehicle. The in-vehicle system 100 includes a battery 200, a power conversion unit 300, and a motor 400.

Further, the in-vehicle system 100 has a plurality of ECUs (not shown). These plurality of ECUs send and receive signals to and from each other via bus wiring. A plurality of ECUs cooperate to control an electric vehicle. The power running and regeneration of the motor 400 according to the SOC of the battery 200 are controlled by the control of the plurality of ECUs. SOC is an abbreviation for state of charge. ECU is an abbreviation for electronic control unit.

The battery 200 has a plurality of secondary batteries. These plurality of secondary batteries form a battery stack connected in series. The SOC of this battery stack corresponds to the SOC of the battery 200. As the secondary battery, a lithium ion secondary battery, a nickel hydrogen secondary battery, an organic radical battery, or the like can be adopted. The battery 200 corresponds to a DC power source.

The power conversion device 500 included in the power conversion unit 300 performs power conversion between the battery 200 and the motor 400. The power conversion device 500 converts the DC power of the battery 200 into AC power. The power conversion device 500 converts the AC power generated by the power generation (regeneration) of the motor 400 into DC power.

The motor 400 is connected to the axle of an electric vehicle (not shown). The rotational energy of the motor 400 is transmitted to the traveling wheels of the electric vehicle via the axle. On the contrary, the rotational energy of the traveling wheels is transmitted to the motor 400 via the axle.

The motor 400 is powered by AC power supplied from the power converter 500. As a result, propulsive force is applied to the traveling wheels. Further, the motor 400 is regenerated by the rotational energy transmitted from the traveling wheels. The AC power generated by this regeneration is converted into DC power by the power conversion device 500. This DC power is supplied to the battery 200. DC power is also supplied to various electric loads mounted on electric vehicles.

<Power converter>
Next, the power conversion device 500 will be described. The power converter 500 includes an inverter. The inverter converts the DC power of the battery 200 into AC power. This AC power is supplied to the motor 400. The inverter also converts the AC power generated by the motor 400 into DC power. This DC power is supplied to the battery 200.

As shown in FIG. 1, the power conversion device 500 includes a P bus bar 303 and an N bus bar 304. The battery 200 is connected to the P bus bar 303 and the N bus bar 304. The P bus bar 303 is connected to the positive electrode of the battery 200. The N bus bar 304 is connected to the negative electrode of the battery 200. The P bus bar 303 and the N bus bar 304 correspond to the first DC connection portion and the second DC connection portion.

Further, the power conversion device 500 includes a U-phase bus bar 561, a V-phase bus bar 562, and a W-phase bus bar 563. The motor 400 is connected to the U-phase bus bar 561, the V-phase bus bar 562, and the W-phase bus bar 563. In FIG. 1, the connection parts of various bus bars are indicated by white circles. These connection parts are electrically connected by, for example, bolts or welding. The U-phase bus bar 561 to the W-phase bus bar 563 correspond to the AC current-carrying section.

The power conversion device 500 includes a smoothing capacitor 550 and a U-phase switch module 531 to a W-phase switch module 533. The smoothing capacitor 550 has two electrodes. A P bus bar 303 is connected to one of these two electrodes. The N bus bar 304 is connected to the other of the two electrodes. The smoothing capacitor 550 and the U-phase switch module 531 to W-phase switch module 533 are the components of the power conversion unit.

Each of the U-phase switch modules 531 to W-phase switch module 533 has a high-side switch 541 and a low-side switch 542. Further, each of the U-phase switch modules 531 to W-phase switch module 533 has a high-side diode 541a and a low-side diode 542a. These semiconductor elements are coated and protected by a sealing resin.

In this embodiment, an n-channel type IGBT is adopted as the high side switch 541 and the low side switch 542. As shown in FIG. 1, the emitter electrode of the high side switch 541 and the collector electrode of the low side switch 542 are connected. As a result, the high side switch 541 and the low side switch 542 are connected in series.

Further, the cathode electrode of the high side diode 541a is connected to the collector electrode of the high side switch 541. The anode electrode of the high side diode 541a is connected to the emitter electrode of the high side switch 541. As a result, the high-side diode 541a is connected in antiparallel to the high-side switch 541.

Similarly, the cathode electrode of the low side diode 542a is connected to the collector electrode of the low side switch 542. The anode electrode of the low side diode 542a is connected to the emitter electrode of the low side switch 542. As a result, the low-side diode 542a is connected in antiparallel to the low-side switch 542.

As described above, the high side switch 541 and the low side switch 542 are coated and protected by a sealing resin. From this sealing resin, the collector electrode of the high-side switch 541, the midpoint between the high-side switch 541 and the low-side switch 542, and the tip of the terminal connected to the emitter electrode of the low-side switch 542 are exposed. .. The tips of the terminals connected to the gate electrodes of the high-side switch 541 and the low-side switch 542 are exposed from the sealing resin. In the following, these terminals are referred to as a collector terminal 540a, a midpoint terminal 540c, an emitter terminal 540b, and a gate terminal 540d.

The collector terminal 540a is connected to the P bus bar 303. The emitter terminal 540b is connected to the N bus bar 304. As a result, the high side switch 541 and the low side switch 542 are connected in series from the P bus bar 303 to the N bus bar 304 in order.

The midpoint terminal 540c of the U-phase switch module 531 is connected to the U-phase stator coil of the motor 400 via the U-phase bus bar 561. The midpoint terminal 540c of the V-phase switch module 532 is connected to the V-phase stator coil via the V-phase bus bar 562. The midpoint terminal 540c of the W-phase switch module 533 is connected to the W-phase stator coil via the W-phase bus bar 563.

The gate terminals 540d of the high-side switch 541 and the low-side switch 542 included in the U-phase switch modules 531 to W-phase switch module 533 are connected to the gate driver.

The ECU generates a control signal and outputs it to the gate driver. The gate driver amplifies the control signal and outputs it to the gate terminal 540d. As a result, the high-side switch 541 and the low-side switch 542 are controlled to open and close by the ECU. The ECU generates a pulse signal as a control signal. The ECU adjusts the on-duty ratio and frequency of this pulse signal. The on-duty ratio and frequency are determined by the output of the current sensor 650, which will be described later, the output of a rotation angle sensor (not shown), and the like.

When powering the motor 400, the high-side switch 541 and the low-side switch 542 of the three-phase switch module are PWM-controlled by the output of the control signal from the ECU. As a result, the power converter 500 generates a three-phase alternating current. When the motor 400 generates electricity (regenerates), the ECU stops, for example, the output of a control signal. As a result, the AC power generated by the power generation passes through the diode provided in the three-phase switch module. As a result, AC power is converted to DC power.

The type of switch element provided in each of the U-phase switch modules 531 to W-phase switch module 533 is not particularly limited, and for example, MOSFET can be adopted. The semiconductor elements such as switches and diodes included in these switch modules can be manufactured by semiconductors such as Si and wide-gap semiconductors such as SiC. The constituent material of the semiconductor element is not particularly limited.

<Structure of power conversion unit>
Next, the configuration of the power conversion unit 300 will be described. In this regard, in the following, the three directions orthogonal to each other will be referred to as the x direction, the y direction, and the z direction. The x direction corresponds to the lateral direction. The y direction corresponds to the vertical direction. The z direction corresponds to the opposite direction.

As shown in FIG. 2, the power conversion unit 300 includes a cooler 610, a capacitor case 620, a terminal base 630, an insulation base 640, and a current sensor 650, in addition to the power conversion device 500 described so far based on FIG. And has a housing 660.

The cooler 610 functions to cool the three switch modules described above while accommodating them.

The capacitor case 620 serves to house the smoothing capacitor 550. At the same time, the capacitor case 620 functions to support the P bus bar 303 and the N bus bar 304.

The terminal block 630 has a function of connecting each of the P bus bar 303 and the N bus bar 304 and the wire harness extending from the battery 200, and fixing both to the housing 660. Further, the terminal block 630 has a function of connecting each of the U-phase bus bars 561 to the W-phase bus bar 563 and the bus bar of the motor 400 and fixing both to the housing 660.

The insulation base 640 fulfills a function of supporting each of the P bus bar 303 and the N bus bar 304 by coming into contact with each of the P bus bar 303 and the N bus bar 304 extending from the capacitor case 620. The insulation base 640 corresponds to the contact base.

The current sensor 650 functions to detect the alternating current flowing through each of the U-phase bus bars 561 to the W-phase bus bar 563. At the same time, the current sensor 650 functions to integrally connect these three phase buses.

The housing 660 is made of a metal material. The housing 660 is manufactured by, for example, aluminum die casting. The housing 660 has a storage space, in which the cooler 610, the condenser case 620, the terminal block 630, the insulation base 640, and the current sensor 650 are each housed. These stored items and the housing 660 are fixed by bolts, spring bodies, or the like.

<Cooler>
As shown in FIG. 2, the cooler 610 has a supply pipe 611, a discharge pipe 612, and a plurality of relay pipes 613. The supply pipe 611 and the discharge pipe 612 are connected via a plurality of relay pipes 613. Refrigerant is supplied to the supply pipe 611. This refrigerant flows from the supply pipe 611 to the discharge pipe 612 via the plurality of relay pipes 613.

The supply pipe 611 and the discharge pipe 612 extend in the x direction, respectively. The supply pipe 611 and the discharge pipe 612 are separated in the y direction. Each of the plurality of relay pipes 613 extends from the supply pipe 611 toward the discharge pipe 612 along the y direction. The supply port 611a in which the refrigerant is supplied from the outside in the supply pipe 611 and the discharge port 612a in which the refrigerant supplied from the relay pipe 613 in the discharge pipe 612 are discharged to the outside are arranged so as to be separated from each other in the y direction.

The plurality of relay tubes 613 are arranged so as to be separated from each other in the x direction. A gap is formed between two adjacent relay pipes 613. The cooler 610 is configured with a total of three voids. U-phase switch modules 531 to W-phase switch modules 533 are individually provided in these three gaps. This constitutes a power module.

The main surface of each of these three-phase switch modules is in contact with the relay tube 613. The width of the gap in the x direction is narrowed by compressing the plurality of relay pipes 613 in the x direction by the urging force applied from the spring body (not shown). As a result, the contact area between the switch module and the relay tube 613 is increased. Due to this configuration, the heat generated in each of the three-phase switch modules can be dissipated to the refrigerant via the relay pipe 613.

<Capacitor case>
The capacitor case 620 is made of an insulating resin material. A smoothing capacitor 550 is housed in the capacitor case 620. The P bus bar 303 is connected to one of the two electrodes included in the smoothing capacitor 550. The N bus bar 304 is connected to the other of the two electrodes.

<P bus bar and N bus bar>
The P bus bar 303 and the N bus bar 304 are manufactured by pressing a metal flat plate. Each of the P bus bar 303 and the N bus bar 304 has a switch side extension portion 305 and a battery side extension portion 306. The switch-side extension 305 and the battery-side extension 306 are each connected to the electrodes of the smoothing capacitor 550. A part of each of the switch side extension portion 305 and the battery side extension portion 306 is exposed to the outside of the capacitor case 620.

In the following, the portion of the switch side extension portion 305 exposed to the outside of the capacitor case 620 will be referred to as the switch side extension portion 305 without particular distinction. Similarly, the portion of the battery-side extension portion 306 exposed to the outside of the capacitor case 620 is referred to as the battery-side extension portion 306.

The switch-side extension 305 of each of the P bus bar 303 and the N bus bar 304 has a thin flat plate shape in the z direction. The switch-side extension portions 305 of the P bus bar 303 and the N bus bar 304 are laminated in the z direction via an insulating member (not shown).

Although not shown, a through hole penetrating in the z direction and a connecting portion rising in the z direction from the edge of the through hole are formed in the switch side extension 305 of each of the P bus bar 303 and the N bus bar 304. There is.

The collector terminal 540a is inserted through the through hole of the switch side extension portion 305 of the P bus bar 303. Then, the connecting portion rising from the edge of the through hole and the collector terminal 540a are joined.

Similarly, the emitter terminal 540b is inserted into the through hole of the switch side extension portion 305 of the N bus bar 304. Then, the connecting portion rising from the edge of the through hole and the emitter terminal 540b are joined.

The battery-side extension 306 of each of the P bus bar 303 and the N bus bar 304 has a flat plate shape having a thin thickness in the z direction. At the same time, these two battery-side extension portions 306 have a shape extending in the y direction so as to be separated from the capacitor case 620. These two battery-side extension portions 306 are arranged in the x direction.

The tip portions of the battery-side extension portions 306 of the P bus bar 303 and the N bus bar 304 separated from the capacitor case 620 are fixed to the terminal block 630. The central portion between the capacitor case 620 side and the terminal block 630 side of these two battery-side extension portions 306 is in contact with the insulating base 640 in a z-direction.

<Phase Basba>
The U-phase bus bar 561 to the W-phase bus bar 563 are manufactured by pressing a metal flat plate. These three phase basses have a shape extending in the y direction. And the three phase basses are lined up in the x direction. At the same time, these three phase bus bars are separated from the battery side extension 306 of each of the P bus bar 303 and the N bus bar 304 in the x direction.

One end of each of the U-phase bus bars 561 to the W-phase bus bar 563 is connected to the midpoint terminal 540c. The other ends of each of these three phase buses are fixed to the terminal block 630. A current sensor 650 is provided at the central portion between the midpoint terminal 540c side and the terminal block 630 side of the three phase bus bars.

<Current sensor>
The current sensor 650 has a magnetic equilibrium type first magnetic-electric conversion unit 651, a second magnetic-electric conversion unit 652, a third magnetic-electric conversion unit 653, and a resin molding unit 654. Further, the current sensor 650 has a shielding shield (not shown), a resin lid portion, and an opposing shield.

The three magnetoelectric conversion units have a magnetoresistive effect element whose resistance value fluctuates according to a magnetic field (transmitted magnetic field) transmitted through itself. The magnetoresistive effect element has a property that the resistance value changes according to the component in the direction orthogonal to the z direction of the transmitted magnetic field. On the other hand, the magnetoresistive sensor has a property that the resistance value does not change depending on the component of the transmitted magnetic field along the z direction.

The central portion of each of the U-phase bus bar 561 to the W-phase bus bar 563 is insert-molded in the resin molding section 654. The first magnetic-electric conversion unit 651 to the third magnetic-electric conversion unit 653 are provided in the resin-molded portion 654 in a manner facing the portion inserted into the resin-molded portion 654 in these three phase baths in the z direction.

Further, three shielding shields are insert-molded in the resin molding portion 654. Three opposing shields are insert-molded on the resin lid. The resin lid portion is connected to the resin molding portion 654 in such a manner that these three shielding shields and the three opposing shields are arranged so as to be separated from each other in the z direction.

The shielding shield is made of a metal material having a higher magnetic permeability than the resin molded portion 654. The facing shield is made of a metal material having a higher magnetic permeability than the resin lid. These two shields have a flat plate shape with a thin thickness in the z direction.

Between one shielding shield arranged in the z direction and one facing shield, a portion molded into the resin molding portion 654 in one phase bus bar and one magnetic electric conversion portion are located. As a result, the input of external noise to the magnetron conversion unit is suppressed. The distribution of the magnetic field (magnetic field to be measured) generated from the current flowing through the insert-molded portion in the resin molding portion 654 in the phase bus bar is regulated. Fluctuations in the direction of the magnetic field to be measured that passes through the magnetron conversion unit are suppressed.

The current sensor 650 having such a configuration and the battery-side extension portions 306 of the P bus bar 303 and the N bus bar 304 are arranged so as to be separated from each other in the x direction.

<Magnetic field>
As described above, the P bus bar 303 is connected to the positive electrode of the battery 200. The N bus bar 304 is connected to the negative electrode of the battery 200. Therefore, when a current flows from the terminal block 630 side to the capacitor case 620 side in the battery side extension portion 306 of the P bus bar 303, the battery side extension portion 306 of the N bus bar 304 moves from the capacitor case 620 side to the terminal block 630 side. Current flows toward. In this way, the flow directions of the DC current flowing through the battery-side extension portion 306 of the P bus bar 303 and the DC current flowing through the battery-side extension portion 306 of the N bus bar 304 are opposite in the y direction between the terminal block 630 and the capacitor case 620. It has become. The direct current flowing through the battery-side extension 306 of the P bus bar 303 and the direct current flowing through the battery-side extension 306 of the N bus bar 304 have the same amount of energization.

The battery-side extension portion 306 of the P bus bar 303 and the battery-side extension portion 306 of the N bus bar 304 in which direct currents flow in opposite directions in the y direction are arranged in the x direction. Therefore, the magnetic field generated from the direct current flowing through these two battery-side extension portions 306 is strengthened between the two battery-side extension portions 306 in the x direction.

However, the magnetic field generated by these two battery-side extensions 306 weakens outside between the two battery-side extensions 306 in the x direction. The U-phase bus bar 561 to the W-phase bus bar 563 and the current sensor 650 are located at positions where the magnetic field is weakened. Therefore, it is possible to prevent the magnetic field generated from the battery-side extension portion 306 from passing through the magnetic-electric conversion portion without being completely shielded by the shield included in the current sensor 650. As a result, it is possible to prevent the current sensor 650 from deteriorating the detection accuracy of the alternating current.

The central portion between the capacitor case 620 side and the terminal block 630 side of the battery side extension 306 of each of the P bus bar 303 and the N bus bar 304 is in contact with the insulating base 640 in the z direction.

According to this, it is suppressed that the relative positions of the battery side extension portion 306 of the P bus bar 303 and the battery side extension portion 306 of the N bus bar 304 fluctuate due to vibration in the z direction or the like. Therefore, it is possible to suppress fluctuations in the locations where the magnetic fields emitted from these two battery-side extension portions 306 strengthen and weaken each other. As a result, the magnetic field generated from the battery-side extension portion 306 is suppressed from passing through the magnetron conversion portion included in the current sensor 650.

Although the preferred embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and can be variously modified and implemented without departing from the gist of the present disclosure.

(First modification)
In this embodiment, an example is shown in which the current sensor 650 has three magnetron conversion units for detecting alternating current flowing through each of the three phase buses. However, when the three-phase stator coil included in the motor 400 has a star connection or delta connection configuration, if the alternating current flowing through two phase bus bars out of the three phase bus bars can be detected, the remaining one phase bus bar flows. The alternating current can be estimated. Therefore, it is also possible to adopt a configuration in which the current sensor 650 has two magnetic-electric conversion units in order to detect the alternating current of two of the three phase bus bars.

Then, in the case of this modification, in order to avoid the influence of the magnetic field emitted from the P bus bar 303 and the N bus bar 304, the two phase bus bars separated from the P bus bar 303 and the N bus bar 304 in the x direction among the three phase bus bars are used. It is also possible to adopt a configuration in which two magnetron conversion units are provided.

(Second modification)
In this embodiment, as shown in FIG. 2, an example is shown in which the P bus bar 303 is located on the three phase bus bar sides in the x direction with respect to the N bus bar 304. However, on the contrary, it is also possible to adopt a configuration in which the N bus bar 304 is located on the three phase bus bar sides in the x direction with respect to the P bus bar 303.

(Other variants)
In this embodiment, an example in which the power converter 500 includes an inverter is shown. However, the power converter 500 may include a converter in addition to the inverter.

In this embodiment, an example is shown in which the power conversion unit 300 is included in the in-vehicle system 100 for an electric vehicle. However, the application of the power conversion unit 300 is not particularly limited to the above example. For example, a configuration in which the power conversion unit 300 is included in a hybrid system including a motor and an internal combustion engine can be adopted.

In this embodiment, an example in which one motor 400 is connected to the power conversion unit 300 is shown. However, it is also possible to adopt a configuration in which a plurality of motors 400 are connected to the power conversion unit 300. In this case, the power conversion unit 300 has a plurality of three-phase switch modules for forming an inverter.

In this embodiment, an example is shown in which the high-side switch 541 and the low-side switch 542, and the high-side diode 541a and the low-side diode 542a are coated and protected by a sealing resin to form one switch module.

However, unlike this, for example, the high-side switch 541 and the high-side diode 541a may be resin-sealed to form one switch module. The low-side switch 542 and the low-side diode 542a may be resin-sealed to form one switch module. The configuration form of the switch module is not particularly limited.

100 ... In-vehicle system, 200 ... Battery, 300 ... Power conversion unit, 303 ... P bus bar, 304 ... N bus bar, 306 ... Battery side extension, 308 ... Second exposed part, 400 ... Motor, 500 ... Power conversion device, 531 ... U-phase switch module, 532 ... V-phase switch module, 533 ... W-phase switch module, 550 ... Smoothing capacitor, 561 ... U-phase bus bar, 562 ... V-phase bus bar, 563 ... W-phase bus bar, 640 ... Insulation stand, 650 ... Current sensor

Claims (2)

A first DC connection unit (303) connected to one of the positive electrode and the negative electrode of the DC power supply (200),
A second DC connection portion (304) connected to the positive electrode of the DC power supply and the other of the negative electrodes,
A power conversion unit (531-533, 550) that converts the DC power of the DC power source input from the first DC connection unit and the second DC connection unit into AC power, and
An AC energizing unit (561 to 563) that connects the power conversion unit and the motor (400) and supplies the AC power to the motor, and
It has a current sensor (650) that is arranged so as to face the AC current-carrying portion and converts a magnetic field generated from an AC current flowing through the AC current-carrying portion into an electric signal.
The AC current-carrying part, the first DC connection part, and the second DC connection part each extend in the vertical direction orthogonal to the opposite direction of the AC current-carrying part and the current sensor.
A power conversion unit in which the AC current-carrying portion, the first DC connection portion, and the second DC connection portion are sequentially arranged in a horizontal direction orthogonal to the facing direction and the vertical direction. The power conversion unit according to claim 1, further comprising a contact table (640) that contacts each of the first DC connection portion and the second DC connection portion.

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