Power conversion device

Abstract

The invention provides a power conversion device. This power conversion device is provided with a DC-DC conversion unit, an inverter unit, a boost conversion unit, a current sensor for measuring the current flowing to the boost conversion unit, and a base unit, and is characterized in that the current sensor comprises: a sensing unit for measuring the current flowing to the boost conversion unit; and a housing having a single fastening through-hole through which the fastening member passes when fastened to the base part, and a positioning through-hole for positioning with respect to the base part.

Description

Technical Field

[0001] The present invention relates to a power conversion device, and more particularly to a power conversion device including a boost converter, an inverter, and a DC / DC converter. Background Art

[0002] Conventionally, there is known a power conversion device including a boost converter, an inverter, and a DC / DC converter. Such a power conversion device is disclosed in, for example, Japanese Patent Application Laid-Open No. 2023-53944.

[0003] The power conversion device described in Japanese Patent Publication No. 2023-53944 discloses a power conversion device having a boost converter, an inverter, and a DC-DC converter. In the structure disclosed in the above-mentioned patent document 1, the DC-DC converter and the inverter are arranged at positions opposite to each other. In addition, the above-mentioned patent document 1 discloses a structure in which the boost converter boosts the DC power input from the DC power supply and supplies it to the inverter.

[0004] Among them, although not disclosed in Japanese Patent Laid-Open No. 2023-53944, a current sensor for measuring the current flowing in the boost converter is generally provided in the power conversion device. When a current sensor is provided for a power conversion device such as disclosed in the above-mentioned Patent Document 1, it is expected to suppress the increase in the number of components and reduce the workload during assembly. Summary of the invention

[0005] The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide a power conversion device that can suppress an increase in the number of components and reduce the workload during assembly.

[0006] In order to achieve the above-mentioned purpose, a power conversion device of a technical solution of the present invention comprises: a boost converter, which boosts the DC power input from a DC power supply; an inverter, which converts the DC power boosted by the boost converter into AC power and supplies it to a load; a DC-DC converter, which transforms the DC power input from the DC power supply; a current sensor, which measures the current flowing to the boost converter; and a flat base, on which the boost converter, the inverter, the DC-DC converter, and the current sensor are arranged, the current sensor including: a sensing part, which measures the current flowing to the boost converter; and a housing, which has a single fastening through hole for a fastening member to penetrate when fastened to the base, and a positioning through hole for positioning relative to the base.

[0007] In a power conversion device of one technical solution of the present invention, as described above, the current sensor includes a housing having a single fastening through hole through which a fastening member passes when fastening to a base portion, and a positioning through hole for positioning relative to the base portion. Thus, unlike a structure in which a housing is fastened using a plurality of fastening members, the housing can be fixed to the base portion by fastening a single fastening member, thereby suppressing an increase in the number of components. In addition, the housing has a positioning through hole, thereby easily positioning the housing when the housing is fixed to the base portion using the positioning through hole. In addition, the housing can be fixed to the base portion by fastening a single fastening member, thereby reducing the workload during assembly compared to a structure in which a plurality of fastening members are used to fix the housing to the base portion. These results can suppress an increase in the number of components while reducing the workload during assembly.

[0008] In the power conversion device of the above-mentioned technical solution, it is preferred that the housing includes: a first protrusion, which protrudes from one side of a pair of first side surfaces opposite to each other; and a second protrusion, which protrudes from the other side of the pair of first side surfaces, a fastening through hole is provided on the first protrusion, and the positioning through hole includes a first positioning through hole provided on the second protrusion. As long as it is constructed in this way, the first protrusion and the second protrusion protrude from different sides of the pair of first side surfaces, and therefore, the fastening through hole and the first positioning through hole can be provided on different sides of the pair of first side surfaces. Therefore, compared with the structure in which the fastening through hole and the first positioning through hole are provided on the same side of the pair of first side surfaces, the fastening through hole and the first positioning through hole can be arranged at a position farther away. In addition, the fastening member penetrating the fastening through hole also contributes to the positioning of the housing, so that the housing can be positioned at two locations that are farther apart than a structure in which the fastening through hole and the first positioning through hole are provided on the same side of a pair of first side surfaces. Therefore, when the housing is fixed by the fastening member, the housing can be positioned with good accuracy. As a result, when the current sensor is fixed to the base portion, the positioning accuracy of the current sensor can be improved compared to a structure in which the fastening through hole and the first positioning through hole are provided on the same side of a pair of first side surfaces.

[0009] In this case, preferably, the positioning through hole further includes a second positioning through hole, and the second positioning through hole is provided in the first protrusion for positioning relative to the base portion. With such a configuration, the current sensor can be positioned using the first positioning through hole and the second positioning through hole, and therefore, compared with a configuration with only one positioning through hole, the current sensor can be positioned easily and reliably.

[0010] In the structure in which the positioning through hole includes the second positioning through hole, it is preferred that the first positioning through hole has a long hole shape extending in the first direction in which the first protrusion and the second protrusion are arranged, and the second positioning through hole has a perfect circular shape. As long as it is constructed in this way, the first positioning through hole has a long hole shape extending in the first direction, and therefore, it is possible to absorb the manufacturing error of the shell and the base in the first direction. In addition, the first positioning through hole has a long hole shape extending in the first direction, and therefore, it is possible to absorb the manufacturing error of the shell and the base in the first direction, and at the same time, the shell is positioned relative to the base in a direction intersecting with the first direction. As a result, by positioning the shell with the second positioning through hole having a perfect circular shape as a reference, the current sensor can be easily positioned even if there is a manufacturing error in the first direction between the shell and the base.

[0011] In the structure in which the fastening through hole is provided in the first protrusion and the positioning through hole includes the first positioning through hole provided in the second protrusion, it is preferred that the housing includes a first end face on the base side and a second end face on the side opposite to the first end face, and the first protrusion and the second protrusion are provided on the first end face side of a pair of first side faces in a manner of forming a step with the second end face. For example, when the current sensor is fixed to the base in a non-contact state, the housing is fixed to a protrusion formed on the base, and a snap-fitting portion for the fastening member to snap-fit ​​is provided. In addition, when the housing is positioned, a protrusion provided with a through hole for positioning is formed on the base, and the housing is positioned. If the height of the protrusion provided with the snap-fitting portion and the height of the protrusion provided with the through hole for positioning become larger, the material of the base increases. Therefore, as long as it is configured as described above, the fastening through hole and the positioning through hole can be arranged at a position closer to the base portion than the structure in which the fastening through hole and the positioning through hole are arranged on the same plane as the second end face. Therefore, the height of the ridge of the engaging portion provided with the fastening member fastened to the base portion and the ridge of the protrusion provided with the positioning through hole and used for positioning the current sensor can be reduced. As a result, the material of the base portion can be reduced compared to the structure in which the fastening through hole and the positioning through hole are arranged on the same plane as the second end face.

[0012] In this case, it is preferable that the end face of the first protrusion on the side of the base portion and the end face of the second protrusion on the side of the base portion are arranged at a position closer to the second end face than the position of the center between the first end face and the second end face. In the case where the first protrusion and the second protrusion are arranged at a position close to the first end face, when the current sensor is mounted on the base portion, the first protrusion and the second protrusion are arranged at a relatively far position from the operator's point of view. Therefore, when the positioning protrusion is passed through the first positioning through hole formed in the second protrusion, it is difficult to visually recognize the position of the first positioning through hole, compared with the case where the first protrusion and the second protrusion are located at a relatively close position from the operator's point of view. In addition, when the fastening member is passed through the fastening through hole formed in the first protrusion, it is difficult to visually recognize the position of the fastening through hole. In contrast, as long as it is configured as described above, it is possible to form a step between the first protrusion and the second protrusion and the second end face, and at the same time, the positions of the first protrusion and the second protrusion are close to the second end face. Therefore, the fastening through hole and the first positioning through hole can be provided at positions close to the second end surface. Therefore, when the current sensor is positioned, the position of the first positioning through hole can be easily visually recognized. In addition, when the current sensor is fixed to the base, the position of the fastening through hole can be easily visually recognized. As a result, the material of the base can be reduced, and the positioning operation and fastening operation of the current sensor can be easily performed.

[0013] In the structure in which the fastening through hole is provided in the first protrusion and the positioning through hole includes the first positioning through hole provided in the second protrusion, it is preferred that the first protrusion is formed with the fastening through hole in such a manner that the fastening through hole is located at a position aligned with the central portion of a pair of first side surfaces in the first direction, the first direction being the first direction in which the first protrusion and the second protrusion are aligned, the central portion being the central portion of the pair of first side surfaces in the second direction intersecting the first direction, and the second protrusion is formed with the first positioning through hole in such a manner that the first positioning through hole is arranged at a position aligned with the central portion of the pair of first side surfaces in the first direction. With such a configuration, a fastening force can be applied to the central portion of the housing in the second direction when the current sensor is fixed to the base portion. As a result, the fastening force can be equally applied to the ends on one side and the other side of the housing in the second direction, so that the current sensor can be stably fixed to the base portion compared to a structure in which the fastening through hole is arranged on either end side in the second direction.

[0014] In the power conversion device of the above-mentioned technical solution, preferably, the current sensor further includes a pair of bus bars connected to the step-up conversion unit, and the pair of bus bars are arranged on a pair of second side surfaces different from the pair of first side surfaces. As long as the configuration is made in this way, the pair of bus bars are arranged on a pair of second side surfaces different from the pair of first side surfaces, and therefore, compared with a structure in which the pair of bus bars are arranged on a pair of first side surfaces, it is possible to suppress the pair of bus bars from becoming an obstacle to the operation when the current sensor is positioned and fastened. As a result, the operability of positioning and fastening the current sensor can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a circuit diagram of a power conversion device according to an embodiment.

[0016] Figure 2 This is a perspective view of a power conversion device according to an embodiment.

[0017] Figure 3 It is a side view of a power conversion device according to an embodiment.

[0018] Figure 4 This is an exploded perspective view for explaining the structure of the current sensor according to one embodiment and the structure for mounting the current sensor on a base portion.

[0019] Figure 5 It is a side view of a current sensor according to an embodiment.

[0020] Figure 6 It is a top view of a current sensor according to an embodiment. DETAILED DESCRIPTION

[0021] Hereinafter, embodiments of the present invention will be described based on the drawings.

[0022] Reference Figure 1 to Figure 6 , the structure of the power conversion device 100 according to one embodiment of the present invention will be described. The power conversion device 100 is mounted on a vehicle, for example.

[0023] First, refer to Figure 1 , the circuit configuration of the power conversion device 100 is described. The power conversion device 100 includes an input terminal 1 and an output terminal 2. In addition, the power conversion device 100 includes an inverter unit 10, a boost converter unit 20, a DC / DC converter unit 21, a current sensor 30, and a DC power supply 200. In addition, the power conversion device 100 includes a capacitor C1 and a resistor R.

[0024] The inverter unit 10 converts the DC power boosted by the boost converter 20 into AC power and supplies the AC power to the load 210. The load 210 is, for example, a motor. A switch 201 is provided between the power converter 100 and the DC power supply 200.

[0025] The inverter unit 10 includes a switching element module 11. The switching element module 11 converts DC power into AC power. The switching element module 11 includes semiconductor switching elements Q1, Q2, and Q3 constituting an upper arm and semiconductor switching elements Q4, Q5, and Q6 constituting a lower arm.

[0026] The inverter 10 includes a first inverter 10a and a second inverter 10b. The switch element module 11 includes a first switch element module 11a included in the first inverter 10a and a second switch element module 11b included in the second inverter 10b. In addition, the load 210 includes a first load 210a and a second load 210b. The first inverter 10a converts the DC power input from the DC power supply 200 into AC power and supplies it to the first load 210a. The second inverter 10b converts the DC power input from the DC power supply 200 into AC power and supplies it to the second load 210b.

[0027] The boost converter 20 boosts the DC power input from the DC power supply 200. In the present embodiment, the boost converter 20 supplies the boosted DC power to the inverter 10. That is, the boost converter 20 is arranged on the input side of the inverter 10. The boost converter 20 includes a boost switch element module 20a and a reactor 20b. The boost switch element module 20a includes a boost switch element Q11 and a boost switch element Q12. The boost switch element Q11 and the boost switch element Q12 constitute an upper arm and a lower arm, respectively. In addition, the boost converter 20 includes a capacitor C2.

[0028] The reactor 20b is provided between the positive side of the DC power supply 200 and a connection point, which is a connection point between the boost switching element Q11 and the boost switching element Q12. The capacitor C1 is provided between the boost converter 20 and the inverter 10. In addition, in the present embodiment, the resistor R is provided between the boost converter 20 and the inverter 10. The capacitor C1 and the resistor R are provided in parallel with each other. In addition, the capacitor C2 is provided in parallel with the boost switching element Q12.

[0029] The DC-DC converter 21 transforms the DC power input from the DC power supply 200. In the present embodiment, the DC-DC converter 21 converts the voltage of the DC power into a different voltage. Specifically, the DC-DC converter 21 steps down the voltage of the DC power input from the DC power supply 200 via the input terminal 1. In addition, the DC-DC converter 21 supplies the stepped-down voltage to the output terminal 2.

[0030] The current sensor 30 measures the current flowing to the boost converter 20. In the present embodiment, the current sensor 30 is provided between the reactor 20b and the boost switching element module 20a. That is, the current sensor 30 is configured to measure the current flowing in the reactor 20b.

[0031] The capacitor C1 is provided between the boost converter 20 and the inverter 10. In the present embodiment, the resistor R is provided between the boost converter 20 and the inverter 10. The capacitor C1 and the resistor R are provided in parallel with each other.

[0032] The DC power supply 200 has an input terminal 1 provided to the inverter unit 10. The input terminal 1 includes a positive terminal 1a and a negative terminal 1b.

[0033] The output terminal 2 outputs the DC power stepped down by the DC-DC converter 21. The output terminal 2 is connected to a control device (not shown) or the like.

[0034] Next, the structure of the power conversion device 100 will be described.

[0035] In this embodiment, if Figure 2 As shown, the power conversion device 100 includes a voltage boost converter 20 and an inverter 10 (see Figure 1 ), the DC-DC converter 21, and the flat base 22 on which the current sensor 30 is arranged. In the present embodiment, the current sensor 30 is arranged on the base 22 by means of the first protrusion 60, the second protrusion 61, and the third protrusion 62. The first protrusion 60, the second protrusion 61, and the third protrusion 62 are formed integrally with the base 22. In addition, the first protrusion 60, the second protrusion 61, and the third protrusion 62 may be formed separately from the base 22 and fixed to the base 22. In addition, in Figure 2 In the example shown, the boost switch element module 20a is omitted for convenience (see Figure 1 ) icon.

[0036] In addition, in this embodiment, if Figure 2 As shown, the DC-DC converter 21 includes a DC-DC converter element 23 and a DC-DC converter substrate 24 on which the DC-DC converter element 23 is mounted. The DC-DC converter substrate 24 has a flat plate shape. The DC-DC converter substrate 24 is arranged on the base 22. The DC-DC converter element 23 mounted on the DC-DC converter substrate 24 includes a converter switching element 23a, a transformer 23b, a resonant inductor 23c, and a smoothing inductor 23d.

[0037] In addition, in this specification, the front-back direction of the base portion 22 is referred to as the Z direction. In addition, the direction from the back side to the front side of the base portion 22 in the Z direction is referred to as the Z1 direction, and the direction from the front side to the back side of the base portion 22 is referred to as the Z2 direction. In addition, one of the two directions orthogonal to the Z direction is referred to as the X direction, and the other direction is referred to as the Y direction. In addition, the direction on one side of the X direction is referred to as the X1 direction, and the direction on the other side is referred to as the X2 direction. In addition, the direction on one side of the Y direction is referred to as the Y1 direction, and the direction on the other side is referred to as the Y2 direction.

[0038] The converter switching element 23a is provided on the back side (Z2 direction side) of the DC converter substrate 24. The transformer 23b, the resonant reactor 23c, and the smoothing reactor 23d are provided so as to penetrate the DC converter substrate 24.

[0039] In addition, if Figure 2 As shown in FIG. 1 , the power conversion device 100 includes a cooling unit 50. The cooling unit 50 is in the shape of a plate. The cooling unit 50 is disposed on the inverter unit 10 (see FIG. 1 ). Figure 1 ) and the DC-DC converter 21. In addition, the cooling unit 50 is formed of a metal with relatively high thermal conductivity, such as aluminum. The cooling unit 50 has a rectangular shape when viewed from a direction perpendicular to the surface (the surface on the front side (the surface on the Z1 direction side)) and the back side (the back side (the surface on the Z2 direction side)) of the cooling unit 50. The cooling unit 50 includes a cooling flow path 51 (see Figure 3 ).exist Figure 2 In the illustrated example, the power conversion device 100 is illustrated such that the long side direction of the cooling unit 50 is along the X direction and the short side direction is along the Y direction.

[0040] In this embodiment, the switching element module 11 (see Figure 3 ) is mounted on the cooling unit 50 along the surface or back of the flat cooling unit 50. In addition, the DC-DC converter substrate 24 on which the DC-DC converter element 23 is mounted is mounted on the cooling unit 50 along the surface or back of the flat cooling unit 50.

[0041] Specifically, in the present embodiment, the switching element module 11 is mounted on the cooling unit 50 along the back side of the flat cooling unit 50. That is, the inverter unit 10 is provided on the other side (Z2 direction side) of the cooling unit 50. In addition, the DC-DC converter substrate 24 on which the DC-DC converter element 23 is mounted is mounted on the cooling unit 50 along the surface of the flat cooling unit 50.

[0042] In addition, in the present embodiment, the boost converter 20 is mounted on the cooling unit 50 along the surface or the back surface of the flat cooling unit 50. Specifically, the boost converter 20 is mounted on the surface of the cooling unit 50. In addition, the boost converter 20 is arranged adjacent to the DC-DC converter 21 along the long side direction (X direction) of the flat cooling unit 50.

[0043] like Figure 3 As shown, the cooling channel 51 is formed in such a way that the cooling liquid alternately passes through the surface side and the back side of the cooling part 50. Specifically, the cooling channel 51 includes: the cooling channel 511, the cooling channel 515, and the cooling channel 519 as the surface side channel, which are arranged on the surface side (surface side); the cooling channel 513 and the cooling channel 517 as the back side channel, which are arranged on the back side (back side); and the cooling channel 512, the cooling channel 514, the cooling channel 516, and the cooling channel 518 as the connecting channel. The cooling channel 51 is formed in such a way that the cooling liquid flows in from one end side in the long side direction (X direction) of the cooling part 50 and flows out to the other end side.

[0044] The cooling flow path 511, cooling flow path 512, cooling flow path 513, cooling flow path 514, cooling flow path 515, cooling flow path 516, cooling flow path 517, cooling flow path 518, and cooling flow path 519 of the cooling flow path 51 are connected from upstream to downstream in the order of cooling flow path 511, cooling flow path 512, cooling flow path 513, cooling flow path 514, cooling flow path 515, cooling flow path 516, cooling flow path 517, cooling flow path 518, and cooling flow path 519. That is, as Figure 3 As shown, the cooling channel 51 allows the cooling liquid to flow in from the cooling channel 511 of the surface channel, and flows out through the cooling channel 512 of the connecting channel, the cooling channel 513 of the back channel, the cooling channel 514 of the connecting channel, the cooling channel 515 of the surface channel, the cooling channel 516 of the connecting channel, the cooling channel 517 of the back channel, the cooling channel 518 of the connecting channel, and the cooling channel 519 of the surface channel. The inlet for the cooling liquid to flow in and the outlet for the cooling liquid to flow out of the cooling channel 51 can also be arranged in the center of the short side direction of the cooling portion 50. By such an arrangement, Figure 2 In the power conversion device 100 shown, the surface on which the DC-DC conversion unit 21 is arranged remains unchanged, regardless of whether it is arranged on the upper surface or the lower surface when housed in the customer's device, and therefore, the customer does not need to change the piping configuration of the cooling liquid.

[0045] In addition, the cooling liquid flowing out of the cooling flow path 51 is cooled by the heat dissipation of the heat dissipation part 3. In addition, the cooling liquid cooled by the heat dissipation part 3 is supplied by the pump 4 and flows into the cooling flow path 51 again. The heat dissipation part 3 includes a heat exchanger and is cooled by the external air. The heat dissipation part 3 is, for example, a radiator. In addition, the pump 4 may be arranged between the outlet of the cooling flow path 51 and the heat dissipation part 3, and the cooling liquid before the heat dissipation by the heat dissipation part 3 is supplied by the pump 4. In addition, the cooling liquid is, for example, a liquid such as water or antifreeze.

[0046] In addition, if Figure 3 As shown, the inverter unit 10 is arranged on the back side of the cooling unit 50. That is, the inverter unit 10 is provided on the other side (Z2 direction side) of the cooling unit 50. The inverter unit 10 is cooled by the cooling liquid flowing in the back side flow path (cooling flow path 513 and cooling flow path 517). In this embodiment, the first switching element module 11a and the second switching element module 11b are arranged on the back side of the cooling unit 50 and are cooled by the cooling liquid flowing in the back side flow path.

[0047] In addition, the DC-DC converter 21 is arranged on the surface side of the cooling unit 50, and is cooled by the cooling liquid flowing in the surface side flow path (cooling flow path 511, cooling flow path 515, and cooling flow path 519). Specifically, the converter switching element 23a, the transformer 23b, the resonant inductor 23c, and the smoothing inductor 23d are arranged on the surface side of the cooling unit 50, and are cooled by the cooling liquid flowing in the surface side flow path.

[0048] In addition, the boost converter 20 is arranged on the front side of the cooling unit 50 and is cooled by the cooling liquid flowing in the front side flow path (cooling flow path 511, cooling flow path 515, and cooling flow path 519). Figure 1 ) and the reactor 20b are arranged on the surface side of the cooling unit 50, and are cooled by the cooling liquid flowing in the surface side flow path. That is, in this embodiment, the DC-DC converter 21 (see Figure 1 ) is provided on one side (Z1 direction side) of the cooling unit 50.

[0049] The current sensor 30 is disposed on the front side of the cooling unit 50. The current sensor 30 is connected to the cooling unit 50 by means of the first protrusion 60 (see Figure 2 ), the second protrusion 61 (refer to Figure 2 ), and the third protrusion 62 (refer to Figure 2 ) is provided on the base portion 22 and therefore is not cooled by the cooling portion 50.

[0050] (Current Sensor)

[0051] Next, refer to Figures 4 to 6 , the structure of the current sensor 30 of this embodiment will be described.

[0052] like Figure 4 As shown, the current sensor 30 includes a sensing portion 31 and a housing 32. Figure 4 In the example shown, the base portion 22 is omitted for convenience (see Figure 2 ) icon.

[0053] The sensor unit 31 measures the voltage to the boost converter 20 (refer to Figure 2 The sensing unit 31 is configured to measure the current flowing to the boost converter 20 by using, for example, an insulating ADC method including a shunt resistor and an insulating amplifier, a core current sensor method, and a coreless current sensor method.

[0054] In addition, if Figure 4 As shown in FIG. 1 , the housing 32 has: a single fastening through hole 33a through which the fastening member 70 is inserted when fastened to the base portion 22; and positioning through holes (first positioning through hole 34a and second positioning through hole 34b to be discussed later) for positioning relative to the base portion 22. The housing 32 is formed of an insulating resin material. In addition, the fastening member 70 is, for example, a screw.

[0055] In addition, if Figure 4 As shown, the housing 32 includes a first protrusion 33 and a second protrusion 34 .

[0056] The first protrusion 33 is provided on the housing 32 so as to protrude from one side surface 35a of a pair of first side surfaces 35 facing each other. Figure 4 As shown, the first protrusion 33 protrudes toward the X2 direction from the side surface 35 a on the X2 direction side of the pair of first side surfaces 35 .

[0057] In addition, the second protrusion 34 is provided on the housing 32 so as to protrude from the other side surface 35b of the pair of first side surfaces 35. Figure 4 As shown, the second protrusion 34 protrudes toward the X1 direction from the side surface 35 b on the X1 direction side of the pair of first side surfaces 35 .

[0058] In this embodiment, the fastening through hole 33a is provided in the first protrusion 33. In addition, the positioning through hole includes a first positioning through hole 34a provided in the second protrusion 34. Figure 4As shown in the figure, the positioning through hole includes a second positioning through hole 34b for positioning, which is provided in the first protrusion 33 and is used for positioning relative to the base portion 22. In addition, the fastening through hole 33a is opened larger than the first positioning through hole 34a and the second positioning through hole 34b. In addition, the first positioning through hole 34a is opened larger than the second positioning through hole 34b.

[0059] In addition, if Figure 4 As shown, the current sensor 30 includes a pair of bus bars 40 connecting one bus bar to the step-up converter 20. The pair of bus bars 40 are provided on a pair of second side surfaces 36 different from the pair of first side surfaces 35. The pair of bus bars 40 extend in the Z1 direction.

[0060] One bus bar 40a of the pair of bus bars 40 protrudes from the side surface 36a on the Y1 direction side of the pair of second side surfaces 36. In addition, the bus bar 40a is provided with the reactor 20b (see Figure 1 ) busbar connection.

[0061] In addition, the other bus bar 40b of the pair of bus bars 40 protrudes from the side surface 36b on the Y2 direction side of the pair of second side surfaces 36. The bus bar 40b and the step-up switching element module 20a (see Figure 1 )connect.

[0062] In addition, if Figure 4 As shown, the first protrusion 60 includes an engagement hole 60a for engaging the fastening member 70 and a first columnar portion 60b. The engagement hole 60a is provided on an end surface 60c of the first columnar portion 60b on the side opposite to the base portion 22 (Z1 direction side). In addition, the first columnar portion 60b has a cylindrical shape. In addition, the first columnar portion 60b protrudes from the base portion 22 toward the Z1 direction by a length L1. In addition, a thread groove is formed in the engagement hole 60a.

[0063] In addition, the second protrusion 61 includes a first protrusion 61a and a second columnar portion 61b that penetrate the first positioning through hole 34a. The first protrusion 61a has a cylindrical shape. In addition, the first protrusion 61a is provided on the end surface 61c of the second columnar portion 61b on the side opposite to the base portion 22. In addition, the length L2 of the first protrusion 61a in the Z direction is the thickness of the first positioning through hole 34a in the Z direction (the thickness T2 of the second protrusion 34 in the Z direction (refer to Figure 5 )) or more. In addition, the second columnar portion 61b has a cylindrical shape. In addition, the second columnar portion 61b protrudes from the base portion 22 toward the Z1 direction by a length L3.

[0064] In addition, the third protrusion 62 includes a second protrusion 62a and a third columnar portion 62b that penetrate the second positioning through hole 34b. The second protrusion 62a has a cylindrical shape. In addition, the second protrusion 62a is provided on the end surface 62c of the third columnar portion 62b on the side opposite to the base portion 22. In addition, the length L4 of the second protrusion 62a in the Z direction is the thickness of the second positioning through hole 34b in the Z direction (the thickness T1 of the first protrusion 33 in the Z direction (refer to Figure 5 )) or more. In addition, the third columnar portion 62b has a cylindrical shape. In addition, the third columnar portion 62b protrudes from the base portion 22 toward the Z1 direction by a length L5.

[0065] In the present embodiment, the length L1 of the first columnar portion 60b, the length L3 of the second columnar portion 61b, and the length L5 of the third columnar portion 62b are equal to each other. In addition, the length L1 of the first columnar portion 60b, the length L3 of the second columnar portion 61b, and the length L5 of the third columnar portion 62b are greater than the thickness T3 of the housing 32 in the Z direction (see FIG. Figure 5 )big.

[0066] Therefore, the current sensor 30 is fixed to the base portion 22 in a state where the case 32 and the base portion 22 are not in contact with each other.

[0067] In addition, in this embodiment, if Figure 5 As shown, the housing 32 includes a base portion 22 (see Figure 2 ) side and the second end face 32b on the side opposite to the first end face 32a. The first protrusion 33 and the second protrusion 34 are provided on the first end face 32a side of the pair of first side faces 35 in a manner that a step 37 is formed between the first protrusion 33 and the second protrusion 34 and the second end face 32b. Specifically, the step 37 is formed in a manner that the first protrusion 33 and the second protrusion 34 are arranged at a position closer to the Z2 direction side than the second end face 32b.

[0068] In addition, if Figure 5 As shown in FIG. 1 , the first protrusion 33 and the second protrusion 34 are provided on each side of the pair of first side surfaces 35 in such a manner that the positions in the Z direction are substantially the same. Specifically, the first protrusion 33 and the second protrusion 34 are provided on each side of the pair of first side surfaces 35 in such a manner that the end surface 33b on the Z2 direction side of the first protrusion 33 and the end surface 34c on the Z2 direction side of the second protrusion 34 are substantially at the same position in the Z direction. In addition, the first protrusion 33 and the second protrusion are provided on each side of the pair of first side surfaces 35 in such a manner that the end surface 33c on the Z1 direction side of the first protrusion 33 and the end surface 34d on the Z1 direction side of the second protrusion 34 are substantially at the same position in the Z direction.

[0069] In addition, in this embodiment, if Figure 5As shown, the housing 32 includes a connecting portion 33d, which extends in the X2 direction and has a tapered shape in which the thickness in the Z direction decreases as it extends in the X2 direction, and is connected to the first protrusion 33. As a result, the mechanical strength of the first protrusion 33 can be improved. In addition, the connecting portion 33d is formed integrally with the first protrusion 33.

[0070] In addition, in this embodiment, if Figure 5 As shown in the figure, the first protrusion 33 is provided on the housing 32 in such a manner that the center 33e of the first protrusion 33 in the Z direction is arranged at a position closer to the Z1 direction side than the position of the center 35c between the first end face 32a and the second end face 32b. In addition, in the present embodiment, the end face 33b on the side of the base portion 22 of the first protrusion 33 is arranged at a position closer to the second end face 32b than the position of the center 35c between the first end face 32a and the second end face 32b.

[0071] In addition, in this embodiment, if Figure 5 As shown in the figure, the second protrusion 34 is provided on the housing 32 in such a manner that the center 34e of the second protrusion 34 in the Z direction is arranged at a position closer to the Z1 direction side than the position of the center 35c between the first end face 32a and the second end face 32b. In addition, in the present embodiment, the end face 34c on the side of the base portion 22 of the second protrusion 34 is arranged at a position closer to the second end face 32b side than the position of the center 35c between the first end face 32a and the second end face 32b.

[0072] In addition, in this embodiment, if Figure 5 As shown, the thickness T1 of the first protrusion 33 in the Z direction is smaller than the thickness T3 of the housing 32 in the Z direction. Specifically, the thickness T1 of the first protrusion 33 in the Z direction is less than half the thickness T3 of the housing 32 in the Z direction.

[0073] In addition, in this embodiment, if Figure 5 As shown, the thickness T2 of the second protrusion 34 in the Z direction is smaller than the thickness T3 of the housing 32 in the Z direction. Specifically, the thickness T2 of the second protrusion 34 in the Z direction is less than half the thickness T3 of the housing 32 in the Z direction.

[0074] In addition, in this embodiment, if Figure 6 As shown in FIG. 1 , the first positioning through hole 34a has a long hole shape extending in the X direction in which the first protrusion 33 and the second protrusion 34 are arranged. Figure 6 As shown in FIG. 1 , the second positioning through hole 34 b has a perfect circular shape.

[0075] In addition, in this embodiment, if Figure 6As shown, the first protrusion 33 is formed with a fastening through hole 33a at a position aligned with a central portion 35d in the X direction where the first protrusion 33 and the second protrusion 34 are aligned, and the central portion 35d is a central portion 35d in the Y direction intersecting the X direction among the pair of first side surfaces 35. In addition, the second protrusion 34 is formed with a first positioning through hole 34a at a position aligned with the central portion 35d among the pair of first side surfaces 35 in the X direction.

[0076] In other words, a fastening through hole 33a is provided in the first protrusion 33 at a position where the length L6 in the Y direction from the other side surface 36b of the second side surface 36 to the center 33f of the fastening through hole 33a is approximately half the length L7 in the Y direction of the shell 32.

[0077] In addition, in the second protrusion 34, a first positioning through hole 34a is provided at a position where the length L8 in the Y direction from one side surface 36a of the second side surface 36 to the center 34f of the first positioning through hole 34a is approximately half the length L7 in the Y direction of the shell 32.

[0078] That is, the center portion 35 d in the Y direction of the pair of first side surfaces 35 is not only the center portion of the first side surface 35 in the Y direction, but also refers to a region of a predetermined size including the center portion of the first side surface 35 in the Y direction.

[0079] In addition, if Figure 6 As shown, a part of the side surface 35a of one (X2 direction side) of the pair of first side surfaces 35 protrudes toward the X2 direction. In addition, the side surface 35b of the other (X1 direction side) of the pair of first side surfaces 35 does not protrude toward the X1 direction. That is, the side surface 35b is a flat surface extending along the Y direction.

[0080] In addition, in this embodiment, if Figure 6 As shown, the second positioning through hole 34b is provided at a position of the first protruding portion 33 on the X2 direction side relative to the fastening through hole 33a. In other words, the second positioning through hole 34b is formed in the first protruding portion 33 in such a manner that the center 34g of the second positioning through hole 34b is located at a position on the X2 direction side relative to the center 33f of the fastening through hole 33a. In addition, the second positioning through hole 34b is provided at a position of the first protruding portion 33 on the Y1 direction side relative to the fastening through hole 33a. In other words, the second positioning through hole 34b is formed in the first protruding portion 33 in such a manner that the center 34g of the second positioning through hole 34b is located at a position on the Y1 direction side relative to the center 33f of the fastening through hole 33a.

[0081] In addition, in this embodiment, if Figure 6As shown, the first protrusion 33 and the second protrusion 34 are configured to intersect with the pair of bus bars 40. Among them, an imaginary straight line 90 connecting the center 33f of the fastening through hole 33a and the center 34f of the first positioning through hole 34a and an imaginary straight line 91 connecting the center 40c of the bus bar 40a in the X direction and the center 40d of the bus bar 40b in the X direction are considered. In the present embodiment, the first protrusion 33, the second protrusion 34, and the pair of bus bars 40 are arranged on the housing 32 in a positional relationship that the imaginary straight line 90 and the imaginary straight line 91 are substantially orthogonal. In addition, the imaginary straight line 90 and the imaginary straight line 91 are substantially orthogonal to each other, which means that the angle at which the imaginary straight line 90 and the imaginary straight line 91 intersect is not only 90 degrees, but also includes an angle greater (or smaller) than 90 degrees.

[0082] Among them, refer to Figure 4 , facing the base portion 22 (refer to Figure 2 ) A method for mounting the current sensor 30 is described. When mounting the current sensor 30 to the base portion 22, first, the second protrusion 62a is passed through the second positioning through hole 34b. Then, the first protrusion 61a is passed through the first positioning through hole 34a. Thus, the position of the current sensor 30 relative to the base portion 22 is determined. In addition, the first positioning through hole 34a has a long hole shape, so the position of the current sensor 30 in the X direction can be adjusted. And, the fastening member 70 is passed through the fastening through hole 33a and fastened. Thus, the current sensor 30 is fixed to the base portion 22.

[0083] (Effects of this embodiment)

[0084] In this embodiment, the following effects can be obtained.

[0085] In the present embodiment, as described above, the power conversion device 100 includes: a boost converter 20 that boosts the DC power input from the DC power source 200; an inverter 10 that converts the DC power boosted by the boost converter 20 into AC power and supplies it to the load 210; a DC-DC converter 21 that transforms the DC power input from the DC power source 200; a current sensor 30 that measures the current flowing to the boost converter 20; and a flat base 22. The step-up converter 20, the inverter 10, the DC-DC converter 21, and the current sensor 30 are arranged on the base 22. The current sensor 30 includes: a sensing part 31, which measures the current flowing to the step-up converter 20; and a shell 32, which has: a single fastening through hole 33a, which is passed through by the fastening member 70 when fastened to the base 22; and positioning through holes (a first positioning through hole 34a and a second positioning through hole 34b) for positioning relative to the base 22.

[0086] Thus, unlike a structure in which the housing 32 is fastened with a plurality of fastening members 70, the housing 32 can be fixed to the base portion 22 by fastening a single fastening member 70, and thus, an increase in the number of parts can be suppressed. In addition, the housing 32 has a positioning through hole, and thus, when the housing 32 is fixed to the base portion 22, the positioning through hole can be used to easily position the housing 32. In addition, the housing 32 can be fixed to the base portion 22 by fastening a single fastening member 70, and thus, compared with a structure in which the housing 32 is fixed to the base portion 22 with a plurality of fastening members 70, the workload during assembly can be reduced. As a result, an increase in the number of parts can be suppressed, and the number of working steps can be reduced.

[0087] In the present embodiment, as described above, the housing 32 includes the first protrusion 33 protruding from one side 35a of a pair of first side surfaces 35 opposing each other and the second protrusion 34 protruding from the other side 35b of the pair of first side surfaces 35, the fastening through hole 33a is provided in the first protrusion 33, and the positioning through hole includes the first positioning through hole 34a provided in the second protrusion 34. Thus, the first protrusion 33 and the second protrusion 34 protrude from the side 35a and the side 35b that are different from each other in the pair of first side surfaces 35, and therefore, the fastening through hole 33a and the first positioning through hole 34a can be provided on the side 35a and the side 35b that are different from each other in the pair of first side surfaces 35. Therefore, compared with the structure in which the fastening through hole 33a and the first positioning through hole 34a are arranged on the same side of the pair of first side surfaces 35, the fastening through hole 33a and the first positioning through hole 34a can be arranged at positions further away. In addition, the fastening member 70 that penetrates the fastening through hole 33a also contributes to the positioning of the housing 32. Therefore, compared with the structure in which the fastening through hole 33a and the first positioning through hole 34a are arranged on the same side of the pair of first side surfaces 35, the housing 32 can be positioned at two further away places. Therefore, when the housing 32 is fixed by the fastening member 70, the housing 32 can be positioned with good accuracy. As a result, compared with the structure in which the fastening through hole 33a and the first positioning through hole 34a are arranged on the same side of the pair of first side surfaces 35, when the current sensor 30 is fixed to the base portion 22, the positioning accuracy of the current sensor 30 can be improved.

[0088] In the present embodiment, as described above, the positioning through hole further includes a second positioning through hole 34b for positioning, and the second positioning through hole 34b for positioning is provided in the first protrusion 33 and is used for positioning relative to the base portion 22. Thus, the current sensor 30 can be positioned using the first positioning through hole 34a and the second positioning through hole 34b. Therefore, compared with a structure with only one positioning through hole, the current sensor 30 can be positioned easily and reliably.

[0089] In the present embodiment, as described above, the first positioning through hole 34a has a long hole shape extending in the X direction in which the first protrusion 33 and the second protrusion 34 are arranged, and the second positioning through hole 34b has a perfect circular shape. Thus, the first positioning through hole 34a has a long hole shape extending in the X direction, and thus, the manufacturing error of the housing 32 and the base 22 in the X direction can be absorbed. In addition, the first positioning through hole 34a has a long hole shape extending in the X direction, and thus, the housing 32 can be positioned relative to the base 22 in the Y direction intersecting the X direction while absorbing the manufacturing error of the housing 32 and the base 22 in the X direction. As a result, by positioning the housing 32 with reference to the second positioning through hole 34b having a perfect circular shape, even if there is a manufacturing error in the X direction between the housing 32 and the base 22, the current sensor 30 can be easily positioned.

[0090] In the present embodiment, as described above, the housing 32 includes the first end face 32a on the base portion 22 side and the second end face 32b on the side opposite to the first end face 32a, and the first protrusion 33 and the second protrusion 34 are provided on the first end face 32a side of the pair of first side faces 35 so as to form a step 37 between the first protrusion 33 and the second protrusion 34 and the second end face 32b. For example, when the current sensor 30 is fixed to the base portion 22 in a non-contact state, the housing 32 is fixed to the first protrusion 60 formed on the base portion 22 and provided with an engagement hole 60a for the fastening member 70 to engage. In addition, when the housing 32 is positioned, the second protrusion 61 is formed on the base portion 22, and the second protrusion 61 is provided with a first protrusion 61a that penetrates the first positioning through hole 34a, so as to position the housing 32. If the height of the first protrusion 60 provided with the engaging hole 60a (the length L1 of the first columnar portion 60b) and the height of the second protrusion 61 provided with the first protrusion 61a penetrating the first positioning through hole 34a (the length L3 of the second columnar portion 61b) become larger, the material of the base portion 22 increases. Therefore, by configuring as described above, the fastening through hole 33a and the positioning through hole can be provided at a position closer to the base portion 22 than in a structure in which the fastening through hole 33a and the positioning through hole are arranged on the same plane as the second end surface 32b. Therefore, it is possible to reduce the height of the first protrusion 60 (the length L1 of the first columnar portion 60b) provided with the engaging hole 60a of the fastening member 70 fastened to the base portion 22, the height of the second protrusion 61 (the length L3 of the second columnar portion 61b) provided with the first protrusion 61a penetrating the positioning through hole and used for positioning the current sensor 30, and the height of the third protrusion 62 (the length L5 of the third columnar portion 62b) provided with the second protrusion 62a penetrating the positioning through hole and used for positioning the current sensor 30. As a result, the material of the base portion 22 can be reduced compared to a structure in which the fastening through hole 33a and the positioning through hole are arranged on the same plane as the second end surface 32b.

[0091] In the present embodiment, as described above, the end surface 33b of the first protrusion 33 on the side of the base portion 22 and the end surface 34c of the second protrusion 34 on the side of the base portion 22 are arranged at a position closer to the second end surface 32b than the position of the center 35c between the first end surface 32a and the second end surface 32b. In the case where the first protrusion 33 and the second protrusion 34 are arranged at a position close to the first end surface 32a, when the current sensor 30 is mounted on the base portion 22, the first protrusion 33 and the second protrusion 34 are arranged at a relatively far position from the operator's point of view. Therefore, when the first protrusion 61a for positioning is inserted into the first positioning through hole 34a formed in the second protrusion 34, it is difficult to visually recognize the position of the first positioning through hole 34a, compared with the case where the first protrusion 33 and the second protrusion 34 are located at a relatively close position from the operator's point of view. In addition, when the fastening member 70 is inserted into the fastening through hole 33a formed in the first protrusion 33, it is difficult to visually recognize the position of the fastening through hole 33a. In contrast, by configuring as described above, the step 37 can be formed between the first protrusion 33 and the second protrusion 34 and the second end face 32b, and the positions of the first protrusion 33 and the second protrusion 34 can be close to the second end face 32b. Therefore, the fastening through hole 33a and the first positioning through hole 34a can be set at a position close to the second end face 32b. Therefore, when the current sensor 30 is positioned, it is easy to visually recognize the position of the first positioning through hole 34a. In addition, when the current sensor 30 is fixed to the base 22, it is easy to visually recognize the position of the fastening through hole 33a. As a result, the material of the base 22 can be reduced, and the positioning operation and fastening operation of the current sensor 30 can be easily performed.

[0092] In the present embodiment, as described above, the first protrusion 33 is formed with the fastening through hole 33a at a position aligned with the central portion 35d in the X direction where the first protrusion 33 and the second protrusion 34 are aligned, the central portion 35d being the central portion 35d in the Y direction intersecting the X direction of the pair of first side surfaces 35, and the second protrusion 34 is formed with the first positioning through hole 34a at a position aligned with the central portion 35d in the pair of first side surfaces 35 in the X direction. Thus, when the current sensor 30 is fixed to the base 22, a fastening force can be applied to the central portion of the housing 32 in the Y direction. As a result, the fastening force can be applied equally to the ends on one side and the other side of the housing 32 in the Y direction, and therefore, compared with a structure in which the fastening through hole 33a is arranged on either end side in the Y direction, the current sensor 30 can be stably fixed to the base 22.

[0093] In the present embodiment, as described above, the current sensor 30 further includes a pair of bus bars 40 that connect one bus bar to the step-up converter 20, and the pair of bus bars 40 are provided on a pair of second side surfaces 36 that are different from the pair of first side surfaces 35. Thus, the pair of bus bars 40 are provided on a pair of second side surfaces 36 that are different from the pair of first side surfaces 35, and therefore, compared with a structure in which the pair of bus bars 40 are provided on a pair of first side surfaces 35, it is possible to suppress the pair of bus bars 40 from becoming an obstacle to the work when positioning and fastening the current sensor 30. As a result, the operability of positioning and fastening the current sensor 30 can be improved.

[0094] [Modifications]

[0095] The embodiments disclosed this time should be considered as illustrative in all points, and the scope of the present invention is indicated by the claims rather than the description of the embodiments described above, and includes all changes (modifications) within the meaning and scope equivalent to the claims.

[0096] For example, in the above embodiment, the following structure is shown: the housing 32 includes the first protrusion 33 and the second protrusion 34, the fastening through hole 33a is provided in the first protrusion 33, and the first positioning through hole 34a is provided in the second protrusion 34, but the present invention is not limited to this. For example, the housing may not include the first protrusion 33 and the second protrusion 34. In this case, the fastening through hole and the first positioning through hole may be provided at positions opposite to each other in the housing 32.

[0097] In the above embodiment, the following structure is shown: the housing 32 includes the first protrusion 33 and the second protrusion 34, the fastening through hole 33a is provided in the first protrusion 33, and the first positioning through hole 34a is provided in the second protrusion 34, but the present invention is not limited to this. For example, the fastening through hole and the first positioning through hole may not be provided at positions relative to each other. The fastening through hole and the first positioning through hole may also be provided on the same side of a pair of first side surfaces 35, or one may be provided on any side of the first side surface 35, and the other may be provided on any side of the second side surface 36.

[0098] In addition, in the above-mentioned embodiment, an example of a structure in which the positioning through hole includes the second positioning through hole 34b is shown, but the present invention is not limited to this. For example, the positioning through hole may not include the second positioning through hole 34b. However, in the case where the positioning through hole does not include the second positioning through hole 34b, the operability when positioning the current sensor 30 is reduced. Therefore, the positioning through hole preferably includes the second positioning through hole 34b.

[0099] In the above embodiment, the positioning through hole includes two positioning through holes, namely the first positioning through hole 34a and the second positioning through hole 34b, but the present invention is not limited thereto. For example, the positioning through hole may include three or more positioning through holes.

[0100] In addition, in the above-mentioned embodiment, the example of the structure in which the first positioning through hole 34a has a long hole shape extending in the X direction and the second positioning through hole 34b has a perfect circular shape is shown, but the present invention is not limited to this. For example, it is also possible to form a structure in which the first positioning through hole has a perfect circular shape and the second positioning through hole has a long hole shape extending in the X direction.

[0101] In addition, in the above-mentioned embodiment, the example of the structure in which the first positioning through hole 34a has a long hole shape and the second positioning through hole 34b has a perfect circular shape is shown, but the present invention is not limited to this. For example, the first positioning through hole and the second positioning through hole can also have a perfect circular shape. However, in the case where the first positioning through hole and the second positioning through hole have a perfect circular shape, it is difficult to absorb the manufacturing error in the X direction of the housing 32 and the base portion 22. Therefore, any one of the first positioning through hole and the second positioning through hole is preferably constructed in a manner having a long hole shape.

[0102] In addition, in the above-mentioned embodiment, an example of a structure in which the first protrusion 33 and the second protrusion 34 are arranged on the first end face 32a side so as to form a step 37 with the second end face 32b is shown, but the present invention is not limited to this. For example, the first protrusion 33 and the second protrusion 34 may be provided on the pair of first side faces 35 so as not to form a step 37 with the second end face 32b. However, in the case where the first protrusion 33 and the second protrusion 34 are provided on the pair of first side faces 35 so as not to form a step 37 with the second end face 32b, it is necessary to increase the height of the first protrusion 60, the second protrusion 61, and the third protrusion 62, and the material required for forming the base portion 22 increases. Therefore, it is preferable that the first protrusion 33 and the second protrusion 34 are arranged on the first end face 32a side so as to form a step 37 with the second end face 32b.

[0103] In addition, in the above-mentioned embodiment, an example of a structure in which the end surface 33b of the first protrusion 33 on the side of the base portion 22 and the end surface 34c of the second protrusion 34 on the side of the base portion 22 are arranged at a position closer to the second end surface 32b than the position of the center 35c between the first end surface 32a and the second end surface 32b is shown, but the present invention is not limited to this. For example, the end surface 33b of the first protrusion 33 on the side of the base portion 22 and the end surface 34c of the second protrusion 34 on the side of the base portion 22 may be arranged at a position closer to the first end surface 32a than the position of the center 35c between the first end surface 32a and the second end surface 32b. However, when the end surface 33b of the first protrusion 33 on the base portion 22 side and the end surface 34c of the second protrusion 34 on the base portion 22 side are arranged at a position closer to the first end surface 32a than the position of the center 35c between the first end surface 32a and the second end surface 32b, the workability of the positioning and fastening work of the current sensor 30 is reduced. Therefore, the end surface 33b of the first protrusion 33 on the base portion 22 side and the end surface 34c of the second protrusion 34 on the base portion 22 side are preferably arranged at a position closer to the second end surface 32b than the position of the center 35c between the first end surface 32a and the second end surface 32b.

[0104] In addition, in the above-mentioned embodiment, an example of a structure in which the first protrusion 33 and the second protrusion 34 are formed with the fastening through hole 33a and the first positioning through hole 34a at positions aligned with the central portion 35d of the pair of first side surfaces 35 in the X direction is shown, but the present invention is not limited thereto. For example, in the present invention, the first protrusion 33 and the second protrusion 34 may be formed with the fastening through hole 33a and the first positioning through hole 34a in a manner other than the position aligned with the central portion 35d of the pair of first side surfaces 35 in the X direction. However, in the case in which the first protrusion 33 and the second protrusion 34 are formed with the fastening through hole 33a and the first positioning through hole 34a in a manner other than the position aligned with the central portion 35d of the pair of first side surfaces 35 in the X direction, it is difficult to evenly apply the fastening force to the ends on one side and the other side in the Y direction by the fastening member 70, and it is difficult to stably fix the current sensor 30 to the base portion 22. Therefore, the first protrusion 33 and the second protrusion 34 are preferably configured such that the fastening through hole 33 a and the first positioning through hole 34 a are formed so as to be arranged at positions aligned with the central portion 35 d of the pair of first side surfaces 35 in the X direction.

[0105] In addition, in the above embodiment, an example of a structure in which a pair of bus bars 40 are provided on a pair of second side surfaces 36 is shown, but the present invention is not limited thereto. For example, in the present invention, a pair of bus bars may also be provided on a pair of first side surfaces 35. However, in the case of a structure in which a pair of bus bars are provided on a pair of first side surfaces 35, the pair of bus bars become an obstacle to the work when positioning and fastening the current sensor 30. Therefore, the pair of bus bars 40 are preferably provided on a pair of second side surfaces 36.

[0106] In addition, in the above embodiment, an example of a structure in which the current sensor 30 includes a bus bar and a pair of bus bars 40 connected to the boost converter 20 is shown, but the present invention is not limited to this. For example, the current sensor may not include a pair of bus bars 40. In this case, the current sensor may include wiring, etc., which is connected to the boost converter 20 and allows current to flow.

[0107] In addition, in the above-mentioned embodiment, the example of the structure in which the fastening through hole 33a is opened larger than the first positioning through hole 34a and the second positioning through hole 34b is shown, but the present invention is not limited to this. For example, the fastening through hole may be opened with a size equal to the size of the first positioning through hole 34a and the second positioning through hole 34b, or may be opened with a size smaller than the size of the first positioning through hole 34a and the second positioning through hole 34b. As long as the fastening member 70 can penetrate, the size of the opening of the fastening through hole 33a is not important.

[0108] In addition, in the above-mentioned embodiment, an example of a structure in which the first positioning through hole 34a is opened larger than the second positioning through hole 34b is shown, but the present invention is not limited to this. For example, the first positioning through hole 34a may be opened with a size equal to that of the second positioning through hole 34b, or may be opened with a size smaller than that of the second positioning through hole 34b. As long as the current sensor 30 can be positioned, the sizes of the openings of the first positioning through hole 34a and the second positioning through hole 34b are irrelevant.

[0109] In addition, in the above-mentioned embodiment, an example of the following structure is shown: the power conversion device 100 is provided with a cooling unit 50, and the cooling unit 50 is arranged between the inverter unit 10 and the DC-DC converter unit 21 to cool the inverter unit 10 and the DC-DC converter unit 21, but the present invention is not limited to this. For example, the power conversion device may not have the cooling unit 50. However, in the case where the power conversion device does not have the cooling unit 50, the inverter unit 10 and the DC-DC converter unit 21 are not cooled, and therefore, the power conversion efficiency is reduced. Therefore, the power conversion device 100 is preferably provided with a cooling unit 50.

[0110] In addition, in the above embodiment, the DC-DC converter 21 is provided on the Z1 direction side and the inverter 10 is provided on the Z2 direction side, but the present invention is not limited thereto. For example, the DC-DC converter 21 may be provided on the Z2 direction side and the inverter 10 may be provided on the Z1 direction side.

Claims

1. A power conversion device comprising: a step-up converter for stepping up the voltage of the DC power input from the DC power supply; an inverter unit that converts the DC power boosted by the boost converter unit into AC power and supplies the AC power to a load; a DC-DC converter that transforms the DC power input from the DC power source; a current sensor for measuring a current flowing to the boost converter; as well as A flat plate-shaped base portion, wherein the step-up converter, the inverter, the DC-DC converter, and the current sensor are arranged on the base portion. The current sensor includes: a sensing portion that measures a current flowing to the boost converter portion; and a housing having a single fastening through hole through which a fastening member is inserted when fastening the housing to the base portion, and a positioning through hole for positioning the housing relative to the base portion.

2. The power conversion device according to claim 1, wherein: The housing includes: a first protrusion protruding from one side of a pair of first side surfaces facing each other; and a second protrusion protruding from the other side of the pair of first side surfaces. The fastening through hole is provided in the first protrusion, The positioning through hole includes a first positioning through hole provided in the second protruding portion.

3. The power conversion device according to claim 2, wherein: The positioning through hole further includes a second positioning through hole, and the second positioning through hole is provided in the first protrusion and is used for positioning relative to the base portion.

4. The power conversion device according to claim 3, wherein: The first positioning through hole has a long hole shape extending in a first direction in which the first protrusion and the second protrusion are arranged. The second positioning through hole has a perfect circular shape.

5. The power conversion device according to claim 2, wherein: The housing includes a first end surface on the base portion side and a second end surface on a side opposite to the first end surface. The first protrusion and the second protrusion are provided on the first end surface side of the pair of first side surfaces so as to form a step with the second end surface.

6. The power conversion device according to claim 5, wherein: An end surface of the first protrusion on the base portion side and an end surface of the second protrusion on the base portion side are provided closer to the second end surface than a center position between the first end surface and the second end surface.

7. The power conversion device according to claim 2, wherein: The first protrusion is formed with the fastening through hole in such a manner that the fastening through hole is located at a position aligned with a central portion of the pair of first side surfaces in a first direction, the first direction being a first direction in which the first protrusion and the second protrusion are aligned, and the central portion is a central portion of the pair of first side surfaces in a second direction intersecting the first direction, The second protrusion is formed with the first positioning through hole at a position aligned with the central portion of the pair of first side surfaces in the first direction.

8. The power conversion device according to claim 2, wherein: The current sensor further includes a pair of bus bars, one of which is connected to the boost converter. The pair of bus bars are provided on a pair of second side surfaces different from the pair of first side surfaces.

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