JP2016116340A - Power conversion unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology which makes assembling from both upper and lower directions efficient.SOLUTION: In a PCU 5, a reactor 20 is stored in an upper stage space SU of a case body 10, and a step-down converter 55 is stored in a lower stage space SL of the case body 10. Terminal bases 26 and 27 are provided on a resin cover 24 covering a core 21 of the reactor 20. A power supply bus bar 18 extending from the step-down converter 55 to the upper stage space SU reaches the reactor 20, and fastened together with one end 16a of a relay bus bar 16 by a bolt 29a upwardly inserted in the terminal base 27 on a lower side of the terminal bases 26 and 27. A connector bus bar 15 extending from a connector 14 provided on the base body 10 above the reactor 20, is fastened together with the other end 16b of the relay bus bar 16 by a bolt 28a downwardly inserted in the terminal base 26 on an upper side of the terminal bases 26 and 27.SELECTED DRAWING: Figure 3

Description

  The technology disclosed in this specification relates to a power conversion device.

  Power converters mounted on electric vehicles and the like handle power to supply driving power to a traveling motor as an electric motor or to convert AC power generated by a traveling motor as a generator into DC power. Is big. For this reason, circuit elements such as a power card, a reactor, and a capacitor constituting the power conversion device have a large physique in order to reduce resistance loss and secure a heat radiation area. For example, in the power conversion device disclosed in Patent Document 1 below, a large-sized circuit element such as a power card, a reactor, or a capacitor is assembled in a bottomed case, and an opening that opens on one side is covered with these. The housing structure is adopted.

JP 2013-169075 A

  In the power conversion device of Patent Document 1, in order to assemble a circuit element such as a power card in a case or to perform maintenance, the access is limited to access from one direction with an opening. For example, the terminal block provided in a reactor is comprised so that a volt | bolt may be screw-fastened from the opening part which removed the lid | cover (patent document 1; FIGS. 1-4).

  By the way, the interior space of an electric vehicle that accommodates the power converter, for example, the engine compartment, accommodates various drive system mechanisms such as a travel motor and a transaxle, and the accommodation density tends to increase. For this reason, there is a demand for downsizing of the power conversion device, and further efficiency of space utilization in the case is desired. For example, a case having openings in both the upper and lower directions is used, and circuit elements such as a power card, a reactor, and a capacitor can be assembled to such a case from above or below.

  In addition, when the internal space of the case is divided into an upper space and a lower space, the circuit elements to be assembled in the upper space are assembled from above, and the circuit elements to be assembled in the lower space are assembled from below. . As a result, the mounting efficiency of the circuit elements is improved, but it is desirable that these assemblings are also efficient. In particular, for a bus bar or the like straddling both the upper space and the lower space, a configuration that can be efficiently assembled from both the upper and lower directions is desired. This specification provides the power converter device which makes the assembly | attachment from the up-down both directions efficient.

  In the power conversion device disclosed in the present specification, the reactor is accommodated in the upper space of the case body, and the power supply unit is accommodated in the lower space of the case body. The resin cover that covers the core of the reactor is provided with a terminal block, and the power supply side bus bar that extends from the power supply unit to the upper space reaches the reactor and is inserted upwards under this terminal block. It is fastened together with one end of the relay bus bar by the bolts. A connector-side bus bar extending from the power connector provided on the case body above the reactor is fastened to the other end of the relay bus bar on the upper side of the terminal block with a bolt inserted downward. As a result, it is possible to access the relay bus bar that is screwed to the upper and lower sides of the terminal block with bolts across the upper space and the lower space of the case body from the upper and lower openings of the case body. It becomes possible. Therefore, the assembly from both the upper and lower directions becomes efficient.

  Details of the technology disclosed in this specification and further improvements will be described in the embodiments of the present invention.

It is a block diagram of the electric power system of the hybrid vehicle of an Example. It is a top view of a power control unit. It is sectional drawing cut | disconnected by the III-III line of FIG. It is sectional drawing cut | disconnected by the IV-IV line of FIG.

  A power converter according to an embodiment will be described with reference to the drawings. The power conversion device according to the embodiment is a power control unit (hereinafter referred to as “PCU”) mounted on a hybrid vehicle. The PCU includes a circuit that boosts the power of the main battery, converts the power into an alternating current, and outputs the alternating current to the motor, and a circuit that steps down the power of the main battery and supplies it to another electric device. Typically, the former is a bidirectional converter and an inverter, and the latter is a step-down converter. First, before describing the PCU, the power system of the hybrid vehicle will be described. FIG. 1 shows a block diagram of a power system of the hybrid vehicle 2.

  The hybrid vehicle 2 includes an engine 6 and a motor 7 as a driving source for traveling. These output torques are appropriately distributed / combined by the power distribution mechanism 8 and transmitted to the wheels (not shown) via the propeller shaft 9. It should be noted that FIG. 1 shows only parts necessary for the description of the technology disclosed in this specification, and some parts not related to the description are not shown.

  Electric power for driving the motor 7 is supplied from the main battery 3. The output voltage of the main battery 3 is, for example, 300 volts. In addition to the main battery 3, the hybrid vehicle 2 also includes an auxiliary battery 60 for supplying power to a device group that is driven at a voltage lower than the output voltage of the main battery 3, such as a car navigation device and a room lamp. . In FIG. 1, a group of devices that are driven at a voltage lower than the output voltage of the main battery 3 are collectively referred to as “auxiliary devices 61 and 62”. A signal processing circuit (such as a PWM generation circuit) other than the large current system circuit of the PCU 5 is also a kind of auxiliary machine. In addition, the name “main battery” is for convenience to distinguish from “auxiliary battery”.

  The main battery 3 is connected to the PCU 5 via a system main relay 4 and a power cable (not shown). In the embodiment, the plug electrode attached to the tip of the power cable is electrically connected to the receptor electrodes 14a and 14b of the connector 14 that receives the plug electrode, whereby DC power is supplied from the main battery 3 to the PCU 5. The system main relay 4 is a switch for connecting or disconnecting the main battery 3 and the drive system of the vehicle. The system main relay 4 is switched by a host controller (not shown).

  The PCU 5 is an electronic circuit interposed between the main battery 3 and the motor 7. The PCU 5 compensates the power of the main battery 3, the bidirectional converter 51 that boosts the voltage of the main battery 3 to a voltage suitable for driving the motor 7 (for example, 600 volts), the inverter 53 that converts the boosted DC power into AC. It includes a step-down converter 55, a PWM unit 54, and the like that step down to a voltage suitable for driving the machines 61 and 62 (for example, 12 volts).

  The hybrid vehicle 2 can also generate electric power with the motor 7 using the driving force of the engine 6 or the deceleration energy of the vehicle. When the motor 7 generates power, the inverter 53 converts alternating current into direct current, and the bidirectional converter 51 steps down the voltage to a voltage slightly higher than that of the main battery 3 and supplies it to the main battery 3. Bidirectional converter 51 boosts the voltage input from one side (main battery side) and outputs it to the other side (inverter side), and steps down the voltage input from the other side (inverter side). It has the function to output to the side (main battery side). Having these two functions is why it is called a “bidirectional” converter.

  The bidirectional converter 51 is a step-up / down converter that mainly includes a filter capacitor 41, a reactor 20, and two switching elements SW. A typical example of the switching element SW is an IGBT. Diodes are connected in antiparallel to these switching elements SW. On the other hand, the inverter 53 mainly includes six switching elements SW that repeat switching so as to generate alternating currents of U, V, and W phases of the motor 7. A diode is also connected in antiparallel to these switching elements SW.

  In the bidirectional converter 51 and the inverter 53, the switching element SW is ON / OFF controlled by the PWM signal generated by the PWM unit 54. The PWM unit 54 is connected to a host system (not shown) such as an ECU for vehicle control, and a PWM signal based on the vehicle speed, the amount of depression of the accelerator pedal and the brake pedal, etc. is appropriately sent to the bidirectional converter 51 and the inverter 53. Output. A smoothing capacitor 43 is connected in parallel with the bidirectional converter 51 on the high voltage side (that is, the inverter circuit side) of the bidirectional converter 51.

  The switching elements SW and their peripheral circuits (such as diodes connected in anti-parallel) are packaged as an intelligent power module (IPM). In this specification, such a power module package is referred to as a power card. As will be described later, these power cards are stacked as a stacked unit so as to be cooled by a cooler. The electric wire on the high potential side of the switching element SW of the bidirectional converter 51 or the inverter 53 is referred to as a P line. Further, the electric wires on the low potential side of the bidirectional converter 51 and the inverter 53 are referred to as N lines. Reference numeral 15-19 denotes a range of a strip-shaped conductor plate called a bus bar described later.

  Next, a mechanical configuration example of the PCU 5 will be described. FIG. 2 shows a plan view of the PCU 5. FIG. 3 shows a cross-sectional view taken along line III-III in FIG. FIG. 4 shows a cross-sectional view taken along line IV-IV in FIG. The case of the PCU 5 includes a case body 10, an upper cover 11, and a lower cover 12. The case body 10 is open at the top and bottom, the upper opening is covered by the upper cover 11, and the lower opening is covered by the lower cover 12, thereby blocking the internal space of the case body 10 from the outside. ing.

  Inside the case body 10, a stepped portion 10a, a pressing wall 10b, a partition plate 13, and the like are formed (particularly, see FIG. 4). The step portion 10 a is for attaching the connector 14 and the like to the case body 10. The connector 14 receives the connector 14 through a connector hole 10c formed in a side wall in the rear surface direction (the positive direction of the Y axis of the coordinate system shown in FIG. 2) in the vicinity of the upper opening of the case body 10. The case body 10 is attached so that the mouth side faces the external space. Therefore, the stepped portion 10a is formed thick so that the vicinity of the connector hole 10c on the side wall in the rear surface direction is one step higher than the other portions. The connector 14 is attached above the reactor 20 (in the positive direction of the Z axis).

  The pressing wall 10b is a thick portion formed on the side wall in the front surface direction (the negative direction of the Y axis) of the case body 10, and presses the laminated unit 30 together with a leaf spring 39 described later. The partition plate 13 is an intermediate plate member located in the middle in the height direction (Z-axis direction) of the PCU 5. As shown in FIG. 3, the case main body 10 forms an H shape in the cross-sectional shape in the XZ plane. Thus, a partition plate 13 is provided. These are all made of aluminum and are conductive.

  In the present embodiment, since the partition plate 13 is present in the case body 10, the internal space of the case body 10 is an upper space (upper space SU) above the partition plate 13 (on the positive side of the Z axis). And a space (lower space SL) below the partition plate 13 (on the negative direction side of the Z axis) (see FIGS. 3 and 4). In the upper space SU, the reactor 20, capacitors 41 and 43, the laminated unit 30 and the like are accommodated, and in the lower space SL, the bidirectional converter 51, the PWM unit 54 and the like are accommodated. The partition plate 13 plays a role of a support plate that supports and fixes the reactor 20, the capacitors 41 and 43, the bidirectional converter 51, and the like to the case body 10 in addition to the role of partitioning the internal space vertically. . In the present embodiment, the partition plate 13 does not completely divide the internal space of the case main body 10, and a communication hole 13a is formed in a part thereof. As a result, the upper space SU and the lower space SL are communicated with each other, and electrical wiring such as a relay bus bar in both spaces can be communicated.

  The laminated unit 30 is a laminated body in which a plurality of coolers 31 through which a cooling medium flows and the power card 35 described above are alternately laminated. Each cooler 31 that sandwiches the power card 35 in a sandwich shape is connected to an introduction pipe 33 into which the cooling medium flows and a discharge pipe 34 that discharges the cooling medium that has flowed out of the cooler 31. A plate 37 that closes the open ends of both pipes 33 and 34 is provided on the opposite side (the negative direction side of the Y-axis) from which the water flows. In the present embodiment, the laminated unit 30 is pressed in the direction of the pressing wall 10 b by the plate spring 39 in the upper space SU of the case body 10, and is sandwiched between the pressing wall 10 b and the plate spring 39.

  As shown in FIG. 4, the reactor 20 includes a core 21, coils 22 and 23 wound around the core 21, and a resin cover 24 that covers the core 21. The core 21 is obtained by firing magnetic iron powder. The reactor 20 is fixed in the upper space SU of the case body 10 by attaching a base 25 provided in an X shape to the lower side of the resin cover 24 (on the negative direction side of the Z axis). In addition, although the coils 22 and 23 are exposed in the reactor 20 of an Example, the coils 22 and 23 may be covered with resin.

  In this embodiment, terminal blocks 26 and 27 are formed on the resin cover 24. These terminal blocks 26 and 27 are made of a resin material having excellent electrical insulation and heat resistance characteristics. For example, thick portions are formed on both surfaces of the core 21 in the vertical direction (Z-axis direction). Further, it is integrally formed with the resin cover 24. One terminal block 26 is formed in the vicinity of one end 23 a of the coil 23. The one end 23 a is connected to the high potential side (P side) of the connector 14. The other terminal block 27 is formed at a position and range corresponding to the back side of the terminal block 26. Each of the terminal blocks 26 and 27 may be conceptualized as a separate and independent terminal block, or may be conceptualized as one terminal block. When considered as one terminal block, the terminal block 26 can be regarded as “the upper side of the terminal block”, and the terminal block 27 can be regarded as “the lower side of the terminal block”.

  Two screw holes (not shown) for screwing the relay bus bar 16 and the like are formed in the terminal blocks 26 and 27, respectively. That is, the terminal block 26 is formed with a screw hole in which a nut to which the bolts 28a and 28b can be screwed is insert-molded or a female screw portion is screwed. Similarly, screw holes into which the bolts 29a and 29b can be screwed are formed in the terminal block 27.

  In the present embodiment, one end of the connector bus bar 15, the other end 16b of the relay bus bar 16, and one end 23a of the coil 23 are fastened together with bolts 28a in one screw hole of the terminal block 26 and fixed to the terminal block 26. Yes. In addition, the other end 17b of the relay bus bar 17 is fastened to the other screw hole of the terminal block 26 by a bolt 28b and fixed to the terminal block 26. The other end 17b of the relay bus bar 17 is connected to another bus bar at another connection point (not shown). Another bus bar constitutes a part of the N line (the electric wire on the low potential side of the bidirectional converter 51 and the inverter 53) described above. The other end 16b of the relay bus bar 16 is connected to a positive electrode (metallicon electrode) of the capacitor 41 via a bus bar (not shown). These electrical connection relationships are easily understood with reference to FIG.

  On the other hand, one end 16a of the relay bus bar 16 and the end of the power bus bar 18 are fastened together with bolts 29a in one screw hole of the terminal block 27 and fixed to the terminal block 27. Further, one end 17 a of the relay bus bar 17 and an end portion of the power bus bar 19 are fastened together with bolts 29 b in the other screw hole of the terminal block 27 and fixed to the terminal block 27. These power bus bars 18 and 19 function as voltage input terminals of the step-down converter 55.

  These connector bus bar 15, relay bus bars 16 and 17, and power bus bars 18 and 19 are all strip-shaped conductors having a low resistance value, and are typically made of thick copper plates. Sometimes called Busuba. These bus bars are formed with through holes (not shown) through which the bolts 28 and 29 can be inserted. The relay bus bars 16, 17 have, for example, a U shape so that one end 16 a, 17 a and the other end 16 b, 17 b face the direction of the terminal blocks 26, 27 of the resin cover 24 (positive direction of the Y axis), that is, the same direction. It is molded into.

  The lengths of the straight portions of the relay bus bars 16 and 17 extending in the height direction (Z-axis direction) of the reactor 20 are set equal to the distance between the upper surface of the terminal block 26 and the lower surface of the terminal block 27. Further, the length of the bent portion of the relay bus bars 16 and 17 extending in the front-rear direction (Y-axis direction) of the reactor 20 is such that the linear portion does not contact the resin cover 24 and the stepped portion 10a of the case body 10 (see above). The relay bus bars 16, 17 are set to dimensions that allow the relay bus bars 16, 17 to be attached to the terminal blocks 26, 27. The connector bus bar 15 is set, for example, in a shape that can be routed at the shortest distance depending on the positional relationship between the connector 14 and the reactor 20. Similarly, the power bus bars 18 and 19 are set in a shape that can be routed at the shortest distance from the positional relationship between the step-down converter 55 and the reactor 20.

  In the present embodiment, the relay bus bars 16 and 17 are screwed to the both terminal blocks 26 and the terminal block 27 at their respective ends so as to connect the terminal block 26 and the terminal block 27 of the reactor 20. That is, one end 16a of the relay bus bar 16 is screw-fastened by a bolt 29a inserted upward (in the positive direction of the Z axis) into the terminal block 27, and is inserted downward (in the negative direction of the Z axis) into the terminal block 26. The other end 16b of the relay bus bar 16 is screwed by a bolt 28a. Similarly, one end 17a of the relay bus bar 17 is screwed by a bolt 29b inserted upward (Z-axis positive direction) into the terminal block 27, and is inserted downward (Z-axis negative direction) into the terminal block 26. The other end 17b of the relay bus bar 17 is screwed by a bolt 28b.

  In the present embodiment, communication holes 13 a are formed in the partition plate 13 in correspondence with the positions where the terminal blocks 26 and 27 of the reactor 20 attached to the partition plate 13 are formed. Therefore, even after the reactor 20 is attached to the partition plate 13 and assembled to the case main body 10, the relay bus bars 16 and 17 can be attached to the terminal blocks 26 and 27, respectively. For example, since the tip of the tool can be brought closer to the one end 16a, 17a of the relay bus bar 16, 17 from the lower space SL of the case body 10 through the communication hole 13a of the partition plate 13, The bolts 29a and 29b can be screwed into the screw holes. Further, since the tip of the tool can be directly brought close to the other end 16b, 17b of the relay bus bar 16, 17 in the upper space SU of the case body 10, bolts 28a, 28b are attached to the screw holes of the terminal block 26. It can be screwed.

  More specifically, for example, taking the relay bus bar 16 as an example, the power bus bar 18 extending from the bidirectional converter 51 to the upper space SU via the communication hole 13a is fastened to the one end 16a of the relay bus bar 16 together. As shown, the bolt 29a inserted upward in the terminal block 27 is screwed and fixed. Further, the bolt 28a inserted downward in the terminal block 26 is fixed with screws so that the connector bus bar 15 extending from the connector 14 is fastened to the other end 16b of the relay bus bar 16. Thus, even after the reactor 20 is assembled to the case body 10, the relay bus bar 16 can be screwed to the terminal blocks 27 and 26.

  Further, for example, taking the relay bus bar 17 as an example, the power bus bar 19 extending from the step-down converter 55 to the upper space SU via the communication hole 13a is fastened to the one end 17a of the relay bus bar 17 together. The bolt 29b inserted upward in the base 27 is fixed with screws. Further, a bolt 28b inserted downward into the terminal block 26 is fixed by screwing so that the other end 17b of the relay bus bar 17 is screwed. Thus, even after the reactor 20 is assembled to the case body 10, the relay bus bar 17 can be screwed to the terminal blocks 27 and 26.

  By configuring the PCU 5 in this way, when the terminal block for fixing the relay bus bars 16 and 17 is configured separately from the resin cover 24 of the reactor 20, the terminal tends to protrude in the front-rear direction (Y-axis direction) of the reactor 20. When the terminal blocks 26 and 27 are formed on the resin cover 24, the protruding amount of the table becomes small. That is, the dimensions of the reactor 20 in the front-rear direction are smaller when the terminal blocks 26 and 27 are formed integrally with the resin cover 24 than when the terminal block is configured separately from the resin cover 24. Thereby, the length of the PCU 5 in the front-rear direction (Y-axis direction) can be shortened. The PCU 5 can be reduced in size in the front-rear direction. For example, in the front compartment of the hybrid vehicle 2, the PCU 5 can be accommodated in a lower structure on which the PCU 5 is placed and attached, for example, the range of the planar shape of the transaxle.

  From the above, in the PCU 5 of the present embodiment, the reactor 20 is accommodated in the upper space SU of the case body 10, and the step-down converter 55 is accommodated in the lower space SL of the case body 10. The resin cover 24 covering the core 21 of the reactor 20 has terminal blocks 26 and 27, and the power bus bar 18 extending from the step-down converter 55 to the upper space SU reaches the reactor 20, and these terminals The bolts 29 a inserted upward into the lower terminal block 27 of the tables 26 and 27 are fastened together with one end 16 a of the relay bus bar 16. A connector bus bar 15 extending from the connector 14 provided on the case body 10 above the reactor 20 is inserted into a terminal block 26 on the upper side of the terminal blocks 26 and 27 by a bolt 28a. The other end 16b of the relay bus bar 16 is fastened together. Accordingly, the upper and lower portions of the case body 10 with respect to the relay bus bar 16 that is screwed to the terminal blocks 26 and 27 with the bolts 28a and 29a across the upper space SU and the lower space SL of the case body 10. It becomes possible to access from each opening part. Therefore, the assembly from both the upper and lower directions becomes efficient.

  In the present embodiment, the configuration in which the internal space of the case main body 10 is divided into two spaces (upper space SU and lower space SL) by the partition plate 13 is employed. In the case where it is possible to adopt a configuration in which the unit 30 and the capacitors 41 and 43 and the like can be attached and fixed to the upper space SU and the PWM unit 54 and the step-down converter 55 and the like can be fixed to the lower space SL, the partition plate 13 is Not necessarily required. That is, when the internal space of the case body 10 can be divided vertically without providing the partition plate 13, the upper and lower portions of the case body 10 with respect to the relay bus bar 16 as in the embodiment. It becomes possible to access from each opening part. At this time, the relay bus bar 16 is screwed to the terminal blocks 26 and 27 with bolts 28a and 29a across the upper space SU and the lower space SL of the case body 10. Therefore, even in such a case, the assembly from both the upper and lower directions becomes efficient.

  In the present embodiment, the terminal blocks 26 and 27 formed on the resin cover 24 of the reactor 20 are arranged in the vertical direction (Z) of the core 21 on the rear side (Y-axis negative side) of the core 21 in the front-rear direction (Y-axis direction). Although arranged on both surfaces in the axial direction, for example, terminal blocks may be arranged on both surfaces in the vertical direction (Z-axis direction) of the core 21 on the front side (positive side of the Y axis). In the present embodiment, the terminal blocks 26 and 27 are formed so as to form thick portions on both sides of the core 21 in the vertical direction (Z-axis direction), but the rear direction of the core 21 (the negative direction of the Y-axis). ) And / or a rectangular block-shaped terminal block body may be formed so as to protrude in the forward direction of the core 21 (the positive direction of the Y axis), and the terminal blocks may be provided on both sides thereof.

  Points to be noted regarding the example technology will be described. The PCU 5 corresponds to an example of a power conversion device. The step-down converter 55 corresponds to an example of a power supply unit. The connector 14 corresponds to an example of a power connector. The connector bus bar 15 corresponds to an example of a connector side bus bar. The power supply bus bar 18 corresponds to an example of a power supply side bus bar. The one end 16a corresponds to an example of “one end of the relay bus bar”. The other end 16b corresponds to an example of “the other end of the relay bus bar”. The terminal block 26 corresponds to an example of “the upper side of the terminal block”. The terminal block 27 corresponds to an example of “under the terminal block”. The bolt 28a corresponds to an example of “a bolt inserted downward on the upper side of the terminal block”. The bolt 29a corresponds to an example of “a bolt inserted upward on the lower side of the terminal block”.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. Further, the technical elements described in the present specification or drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Moreover, the technique illustrated in this specification or the drawings achieves a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

2: Hybrid vehicle 3: Main battery 5: PCU
6: Engine 7: Motor 10: Case body 11: Upper cover 12: Lower cover 13: Partition plate 13a: Communication hole 14: Connector 15: Connector bus bar 16, 17: Relay bus bar 16a, 17a: One end 16b, 17b: The other end 18, 19: Power bus bar 20: Reactor 21: Core 22, 23: Coil 24: Resin cover 26, 27: Terminal blocks 28a, 28b, 29a, 29b: Bolt 30: Laminating unit 31: Cooler 35: Power card 41 43: Capacitor 51: Bidirectional converter 53: Inverter 54: PWM unit 55: Step-down converter 60: Auxiliary battery SL: Lower space SU: Upper space

Claims (1)

It is a power conversion device in which the internal space of the case body having openings at the top and bottom is divided into an upper space and a lower space,
A terminal block is provided on the resin cover covering the core, and a reactor accommodated in the upper space,
A power supply unit housed in the lower space;
A power connector provided on the case body above the reactor; and
With
The power supply side bus bar extending from the power supply unit to the upper space reaches the reactor, and is fastened to one end of the relay bus bar by a bolt inserted upward at the lower side of the terminal block,
The connector-side bus bar extending from the power connector is fastened together with the other end of the relay bus bar by a bolt inserted downward on the upper side of the terminal block.
The power converter characterized by the above-mentioned.

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