JP2013188052A - Electric power conversion system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric power conversion system which prevents false detection of a current sensor.SOLUTION: Multiple power modules (60) are radially placed on an upper surface of a base part (100), and a first bus bar (120) and a substrate (130) are sequentially laminated above the power modules (60). Multiple second bus bars (114) respectively extend from the multiple power modules (60) at the outer peripheral side of the substrate (130) in an erection direction from the base part (100). Current sensors (131) are placed so as to correspond to the multiple second bus bars (114).

Description

  The present invention relates to a power conversion device that converts electric energy by a semiconductor element.

  A power conversion device used for inverter control of an electric motor or the like includes a power semiconductor such as a switching element and a control circuit that controls the operation of the power semiconductor. Such a power converter detects the output current value of the power semiconductor and performs control based on the detected value.

  As such a power conversion device, switching elements are arranged circumferentially at a predetermined interval with respect to the central axis of the semiconductor module, and the output conductor of each phase inverter circuit is bent into an L shape and passed through the hollow hole of the current sensor. What is taken out below the inverter module is disclosed (see Patent Document 1).

JP 2007-116840 A

  In the conventional power conversion device configured as described above, the current sensor is arranged on the inner peripheral side of the radially arranged output terminals, so that the current is affected by the AC current of the adjacent output terminals. There is a possibility that an error or erroneous detection may occur in the sensor value.

  This invention is made | formed in view of such a problem, and it aims at providing the power converter device which can prevent the misdetection of a current sensor in a power converter device provided with a power semiconductor element.

  According to one embodiment of the present invention, a plurality of power modules including switching elements, a base including a cooler that cools the power modules, a first bus bar that supplies power to the power modules, and power from the power modules. The present invention is applied to a power conversion device including a plurality of second bus bars to be output and a substrate including a current sensor that detects a current of the second bus bar.

  In this power converter, a plurality of power modules are mounted radially on the upper surface of the base, and a first bus bar and a substrate are sequentially stacked above the power module. The plurality of second bus bars extend from the respective power modules on the outer peripheral side of the substrate in the standing direction from the base, and the current sensors are arranged corresponding to the plurality of second bus bars, respectively. It is characterized by that.

  According to the present invention, the current sensor is provided in each of the second bus bars extending from the base portion in the standing direction on the outer peripheral side of the substrate from each of the radially provided power modules. With such a configuration, the distance between the second bus bars can be widened on the outer peripheral side of the substrate, and the current sensor can be widened according to the position of the second bus bar. Therefore, the current sensor is suppressed from being affected by the other second bus bar.

It is explanatory drawing of the drive system of the 1st Embodiment of this invention. It is explanatory drawing of the power converter device of the 1st Embodiment of this invention. It is explanatory drawing of the power converter device of the 1st Embodiment of this invention, and shows sectional drawing in FIG. It is explanatory drawing of the power converter device of the 2nd Embodiment of this invention. It is explanatory drawing of the power converter device of the 3rd Embodiment of this invention. It is explanatory drawing of the power converter device of the 3rd Embodiment of this invention, and shows sectional drawing in FIG. It is explanatory drawing of the power converter device of the 4th Embodiment of this invention. It is explanatory drawing of the power converter device of the 5th Embodiment of this invention. It is explanatory drawing of the power converter device of the 6th Embodiment of this invention. It is explanatory drawing of the power converter device of the 6th Embodiment of this invention, and shows sectional drawing in FIG. It is explanatory drawing of the power converter device of the 7th Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an explanatory diagram of a drive system 1 according to the first embodiment of this invention.

  The drive system 1 includes a control device 10, a battery 20, a drive motor M, and a power conversion device 50, and controls the drive motor M under the control of the control device 10.

  The control device 10 controls the power conversion device 50 to control the output of the drive motor M.

  The battery 20 supplies power to the drive motor M and stores regenerative power of the drive motor M. The battery 20 is configured as a battery module in which a plurality of secondary batteries such as a lead battery, a nickel metal hydride battery, or a lithium ion battery are connected in series or in parallel.

  The power conversion device 50 includes a plurality of power modules 60U, 60V, and 60W including a switching element 31 and a diode 32. The switching element 31 is configured by a semiconductor element such as an IGBT. The diode 32 is configured by a semiconductor element such as a fast recovery diode (FRD). The diode 32 protects the switching element 31 by preventing a reverse current from being applied to the switching element 31.

  In the present embodiment, these power modules 60U, 60V, and 60W supply AC power to the U phase, V phase, and W phase of the driving motor M, respectively.

  For example, when the output of the driving motor M is increased, the control device 10 applies a gate current to each switching element 31 of the power conversion device 50. Thereby, the power modules 60U, 60V, and 60W supply high current from the battery 20 to the drive motor.

  The control device 10 controls the output of the driving motor M by controlling the gate current according to a duty ratio or the like. Further, during regeneration of the drive motor M, power is regenerated to the battery 20 via the power converter 50.

  Next, the structure of the power conversion device 50 according to the first embodiment of the present invention will be described.

  FIG.2 and FIG.3 is explanatory drawing of the power converter device 50 of the 1st Embodiment of this invention. FIG. 2A shows a top view of the power conversion device 50. FIG. 2B shows the configuration of the power module 60. FIG. 3A shows a cross-sectional view of the power conversion device 50 taken along the line AA in FIG. FIG. 3B is a cross-sectional view of the power conversion device 50 taken along the line BB in FIG.

  The power conversion device 50 has a cylindrical shape and has a cooler 100 having a flat top portion on the upper surface thereof, and the respective portions are stacked on the top side of the cooler 100.

  The power conversion device 50 is provided, for example, on one end side in the axial direction of a driving motor M having a cylindrical shape. The cooler 100 and other configurations do not necessarily have a circular outer peripheral shape, and may be polygonal.

  On the top of the cooler 100, a plurality of power modules 60 (60U1, 60V1, 60W1, 60U2, 60V2, 60W2) are placed at predetermined intervals in the circumferential direction along the circular shape of the top. The power module 60 is a module in which the switching element 31, the diode 32, and the like are enclosed in the same package. The power module 60 is fixed to the top of the cooler 100 with, for example, a bolt or the like via an insulator.

  In the example shown in FIGS. 2 and 3, the driving motor M has three phases of U phase, V phase, and W phase, and each phase is controlled by two power modules 60. It is a configuration.

  The power module 60 includes a set of PN terminals 111 that are supplied with high-voltage DC power, an AC terminal 112 that outputs an alternating high-frequency current, and a plurality of control signal terminals 113 that are connected to a control board 150 described later. .

  The power modules 60 are respectively placed on the top of the cooler 100 in the circumferential direction with the PN terminal 111 facing the inner periphery and the AC terminal 112 and the control signal terminal 113 facing the outer periphery. The AC terminal 112 of the power module 60 is provided with an AC bus bar 114 that extends toward the outer periphery of the cooler 100 and extends above the cooler 100. AC bus bar 114 is electrically connected to the U phase, V phase, and W phase of drive motor M, respectively.

  A DC bus bar 120 that supplies DC power to the power module 60 is disposed on the upper side of the power module 60. The DC bus bar 120 has an annular shape along the shape of the top of the cooler 100. The DC bus bar 120 has a positive electrode and a negative electrode. The positive electrode and the negative electrode are connected to PN terminals provided in the power module 60, respectively.

  A pair of terminals 121 and 122 communicating with the positive electrode and the negative electrode are extended upward at two locations on the outer side in the circumferential direction of the DC bus bar 120.

  A plurality of smoothing capacitors 40 are placed on the upper surface of the DC bus bar 120 at predetermined intervals in the circumferential direction. Smoothing capacitor 40 is electrically connected to the positive electrode and the negative electrode of DC bus bar 120, respectively.

  On the further upper side of the DC bus bar 120, a first substrate 130 having an annular shape substantially the same shape as the DC bus bar 120 is disposed. A current sensor 131 and a pad 132 are mounted on the first substrate 130. In addition, a current sensor control circuit (not shown) that controls the current sensor 131 is mounted. The first substrate 130 is formed with notches 135 and 136 for avoiding contact with the terminals 121 and 122 extending above the DC bus bar 120.

  The DC bus bar 120 and the first substrate 130 have a circular hollow portion 120a formed on the inner peripheral side.

  A DC cable 170 connected to the battery 20 is connected to upper ends of terminals 121 and 122 extending upward from the DC bus bar 120. A crimp terminal 171 is crimped at the end of the DC cable 170. The crimp terminal 171 and the upper ends of the terminals 121 and 122 are fixed by bolts and nuts 172, and these are electrically connected.

  The current sensor 131 detects an output current from the AC bus bar 114 of the power module 60. The current sensor 131 is configured to include, for example, a Hall element, and detects a current flowing through the AC bus bar 114 by a magnetic field of the AC bus bar 114 extending upward.

  The pad 132 is provided in an annular shape on the inner peripheral side of the first substrate 130, and functions as a connection portion to which a connection wiring that is electrically connected to a drive motor M (not shown) is connected. The pad 132 is electrically connected to, for example, a controller provided in the drive motor M by a cable, and values such as electric power, rotation speed, and temperature input to the drive motor M are input.

  Four current sensors 131A, 131B, 131C, and 131D are mounted on the first substrate. In these current sensors 131A, 131B, 131C, and 131D are disposed above the power modules 60U1, 60V1, 60U2, and 60V2, respectively, and detect the currents of these AC bus bars 114.

  When N-phase AC power is controlled by M parallel power modules (N and M are 2 or more), the number of current sensors may be (N−1) × M. Thus, the current sensors 131 are not provided in the power modules 60W1 and 60W2. Power modules 60 </ b> W <b> 1 and 60 </ b> W <b> 2 are disposed at locations corresponding to the cutout portions 135 and 136 of the first substrate 130. In this way, by providing the terminals 121 and 122 at locations where the current sensor 131 is not mounted. It can suppress that the external shape of the power converter device 50 expands.

  A control board 150 is provided on each outer peripheral side of the plurality of power modules 60 placed on the cooler 100. The control device 10 is mounted on the control board 150. The control device 10 controls the operation of the switching element 31 of the power module 60. In addition, the control device 10 acquires the current value detected by the current sensor 131 of the first substrate 130.

  The control board 150 is provided in the vertical direction from the top of the cooler 100. The lower side of the control board 150 is connected to the control signal terminal 113 of the power module 60, and the upper side of the control board 150 is connected to the signal terminal 133 of the first board 130. Therefore, the lower side of the control board 150 is supported by the control signal terminal 113 of the power module 60, and the upper side is supported by the signal terminal 133 of the first board 130.

  The control signal terminal 113 transmits and receives signals between the control device 10 and the power module 60. The signal terminal 133 transmits / receives a signal between the first board 130 and the control board 150, for example, a control signal with the driving motor M via the pad 132, and a current of the AC bus bar 114 acquired by the current sensor 131. A value is sent.

  As described above, in the first embodiment of the present invention, in the power conversion device 50, the power module 60 is placed on the upper surface of the cooler 100 serving as a base. On the upper side of the power module 60, a DC bus bar 120 and a first substrate 130 as a weak electric substrate are sequentially stacked. The control board 150 is disposed on the outer peripheral side of each power module 60.

  The current sensor 131 is mounted on the first board 130, and the current of the AC bus bar 114 extending upward on the outer peripheral side of the first board 130 from the AC terminal 112 disposed on the outer peripheral side from the power module 60. Detect value.

  Thus, each of the AC bus bars 114 extending upward from the outer peripheral side of the power module 60 arranged in the circumferential direction is provided with a current sensor 131 that detects the current of the AC bus bar 114.

  With such a configuration, each AC bus bar 114 and the current sensor 131 can be spaced apart from each other on the outermost peripheral side of the power conversion device 50 to increase the distance between them. With such a configuration, the influence of a magnetic field or the like generated by an alternating current flowing through another AC bus bar 114 is suppressed from affecting the current sensor 131, and the current sensor 131 can be prevented from malfunctioning.

  Further, in the first substrate 130, the number of current sensors is set to (N−1) × M by controlling the N-phase AC power with an M parallel power module (N and M are 2 or more). (In the first embodiment, four current sensors), the notches 135 and 136 are arranged where the terminals 121 and 122 extending upward from the DC bus bar 120 are arranged at locations where the current sensors 131 are not mounted. Formed. With such a configuration, expansion of the outer shape of the power conversion device 50 is suppressed, and an increase in size of the power conversion device 50 can be suppressed.

  Next, the power converter device 50 of the 2nd Embodiment of this invention is demonstrated.

  FIG. 4 is an explanatory diagram of the power conversion device 50 according to the second embodiment of this invention. The basic configuration of the second embodiment is the same as that of the first embodiment, and the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the second embodiment, the outer peripheral shape of the first substrate 130 on which the current sensor 131 and the pad 132 are mounted is formed in a polygon (octagon).

  The polygonal shape of the first substrate 130 is formed corresponding to the position of the power module 60 placed on the cooler 100. That is, it is formed in an octagonal shape having six power modules 60 arranged radially and notches 135 and 136 corresponding to the terminals 121 and 122 of the DC bus bar 120, respectively.

  The shape of the DC bus bar 120 is also an octagon corresponding to the outer peripheral shape of the first substrate 130, and the terminals 121 and 122 are formed at two positions on the side of the octagon.

  As described above, in the second embodiment of the present invention, the outer peripheral shape of the first substrate 130 is not an annular shape but a polygonal annular shape. With this configuration, a room for arranging the control board 150 and the AC bus bar 114 can be widened in the shape of the cooler 100 that is a circular base, and the degree of freedom of layout of the power conversion device 50 is increased.

  Next, the power converter device 50 of the 3rd Embodiment of this invention is demonstrated.

  FIG.5 and FIG.6 is explanatory drawing of the power converter device 50 of the 3rd Embodiment of this invention. FIG. 5 shows a top view of the power converter 50. 6A shows a cross-sectional view of the power converter 50 taken along the line AA in FIG. FIG. 6B is a cross-sectional view of the power conversion device 50 taken along the line BB in FIG.

  The basic configuration of the third embodiment is the same as that of the first embodiment, and the same reference numerals are given to the same components as those of the first or second embodiment, and the description thereof is omitted.

  In the third embodiment, the driving motor M has five phases of U phase, V phase, W phase, R phase, and S phase, and each phase is controlled by two power modules 60, so-called five phases. It is a two-paragraph configuration.

  Specifically, ten power modules 60 of power modules 60U1, 60V1, 60W1, 60R1, 60S1, 60U2, 60V2, 60W2, 60R2, and 60S2 are mounted on the top of the cooler 100. The power modules 60U1, 60V1, 60W1, 60R1, 60U2, 60V2, 60W2, and 60R2 are provided with current sensors 131A to 131G that detect the current of the AC bus bar 114, respectively. In addition, since the number of current sensors can be (N-1) × M by controlling N-phase AC power with an M-parallel power module (N and M are 2 or more) (third In the embodiment, for the eight power sensors 60, the power modules 60S1 and 60S2 are not provided with the current sensors 131 for the ten power modules 60, and the notches 135 and 136 are formed.

  In the third embodiment, the second substrate 160 is further provided on the first substrate 130 on which the current sensor 131 and the pad 132 are mounted.

  As shown in FIGS. 6A and 6B, the current sensor 131 and the pad 132 are on the lower side of the first substrate 130 and between the first substrate 130 and the DC bus bar 120. The second substrate 160 having the same shape as the first substrate 130 is provided.

  A current sensor control circuit (not shown) that controls the current sensor 131 is mounted on the second substrate 160. The second board 160 and the control board 150 are connected by a terminal 161. The second substrate 160 and the first substrate 130 are connected by a terminal 162.

  Thus, in the third embodiment, the second substrate is arranged between the first substrate 130 on which the current sensor 131 and the pad 132 are mounted, and the power module 60 and the DC bus bar 120. With such a configuration, the first substrate 130 can be physically separated from the power module 60 and the DC bus bar 120. Thereby, the influence which the heat which generate | occur | produces in the power module 60 and the DC bus bar 120 has on the current sensor 131 can be suppressed.

  Next, the power converter device 50 of the 4th Embodiment of this invention is demonstrated.

  FIG. 7 is an explanatory diagram of the power conversion device 50 according to the fourth embodiment of this invention. The basic configuration of the fourth embodiment is the same as that of the first embodiment. The same components as those of the first to third embodiments are denoted by the same reference numerals, and the description thereof is omitted.

  The fourth embodiment is a modification of the first and second embodiments described above, and the connection configuration between the terminals 121 and 122 of the DC bus bar 120 and the DC cable 170 is different.

  As shown in FIG. 7B, the upper end portion of the terminal 121 and the DC cable 170 are connected by a crimp terminal 175.

  In the fourth embodiment, as described above, the terminal 121 of the DC bus bar 120 and the DC cable 170 are directly connected by the crimp terminal 175 instead of the bolt and nut 172. With such a configuration, the contact resistance between the terminal 121 and the DC cable 170 can be reduced, and noise generated between the terminal 121 and the DC cable 170 can be reduced. As a result, the current sensor 131 is suppressed from being affected by noise that is suppressed between the terminal 121 and the DC cable 170.

  Instead of the crimp terminal 175, the DC cable 170 and the terminal 121 may be joined by laser or welding.

  Next, the power converter device 50 of the 5th Embodiment of this invention is demonstrated.

  FIG. 8 is an explanatory diagram of the power conversion device 50 according to the fifth embodiment of this invention. The basic configuration of the fifth embodiment is the same as that of the first embodiment. The same components as those of the first to third embodiments are denoted by the same reference numerals, and description thereof is omitted.

  The fifth embodiment is a modification of the above-described third embodiment, and the connection between the terminals 121 and 122 of the DC bus bar 120 and the DC cable 170 is configured in the same manner as in the fourth embodiment.

  That is, as shown in FIG. 8B, the upper end portion of the terminal 121 and the DC cable 170 are connected by the crimp terminal 175.

  In the fifth embodiment, as described above, the terminal 121 of the DC bus bar 120 and the DC cable 170 are directly connected by the crimp terminal 175 instead of the bolt and nut 172.

  The current sensor 131 is mounted on the first substrate 130, and physically separates the first substrate 130 from the power module 60 and the DC bus bar 120 by the second substrate 160.

  With such a configuration, the contact resistance between the terminal 121 and the DC cable 170 can be reduced, and noise generated between the terminal 121 and the DC cable 170 can be reduced. As a result, the current sensor 131 is suppressed from being affected by noise that is suppressed between the terminal 121 and the DC cable 170.

  Next, the power converter device 50 of the 6th Embodiment of this invention is demonstrated.

  9 and 10 are explanatory diagrams of the power conversion device 50 according to the sixth embodiment of the present invention. FIG. 9 shows a top view of the power converter 50. FIG. 10A shows a cross-sectional view of the power converter 50 taken along the line AA in FIG. FIG. 10B shows a cross-sectional view of the power converter 50 taken along the line BB in FIG.

  The basic configuration of the sixth embodiment is the same as that of the first embodiment. The same components as those of the first to fifth embodiments are denoted by the same reference numerals, and the description thereof is omitted.

  The sixth embodiment has a so-called three-phase three-parameter configuration in which the drive motor M has three phases of U phase, V phase, and W phase, and each phase is controlled by three power modules 60, respectively. .

  Specifically, nine power modules 60 of power modules 60U1, 60V1, 60W1, power modules 60U2, 60V2, 60W2, and power modules 60U3, 60V3, 60W3 are mounted on the top of the cooler 100. Yes. Current sensors 131A and 131B are arranged in the power modules 60U1 and 60V1. Current sensors 131C and 131D are arranged in the power modules 60U2 and 60V2. Current sensors 131E and 131F are arranged in the power modules 60U3 and 60V3. These current sensors 131 detect the current of the AC bus bar 114.

  In addition, by controlling the N-phase AC power with an M parallel power module (N and M are 2 or more), the number of current sensors can be (N−1) × M (sixth) In the embodiment, the current sensor 131 is not provided at a position corresponding to the power modules 60W1, 60W2, and 60W3 with respect to the nine power modules 60 and the nine power modules 60, and between the power modules 60W3 and 60U1. A notch 136 is formed between the power modules 60W2 and 60U3.

  The positions of the terminals 121 and 121 in the DC bus bar 120 are preferably provided at positions facing the DC bus bar 120 in consideration of generation of heat and noise. On the other hand, when the arrangement of the power module 60 and the current sensor 131 is not line symmetric, the terminals 121 and 121 do not need to be provided at positions facing each other in the DC bus bar 120. The same applies to the positions of the notches 135 and 136 in the first substrate 130.

  As shown in FIG. 10B, the terminals 121 and 122 and the DC cable 170 are connected by bolts and nuts 172 as in the first embodiment.

  As described above, in the sixth embodiment, the positions of the terminals 121 and 122 of the DC bus bar 120 and the notches 135 and 136 are changed in accordance with the arrangement of the power module 60, thereby Layout flexibility is improved.

  Next, the power converter device 50 of the 7th Embodiment of this invention is demonstrated.

  FIG. 11 is an explanatory diagram of the power conversion device 50 according to the seventh embodiment of this invention. The basic configuration of the seventh embodiment is the same as that of the first embodiment. The same components as those of the first to sixth embodiments are denoted by the same reference numerals, and the description thereof is omitted.

  The seventh embodiment is a modification of the above-described sixth embodiment, and the connection between the terminals 121 and 122 of the DC bus bar 120 and the DC cable 170 is configured in the same manner as in the fourth embodiment.

  That is, as shown in FIG. 11B, the upper end portion of the terminal 121 and the DC cable 170 are connected by the crimp terminal 175.

  In the seventh embodiment, the terminal 121 of the DC bus bar 120 and the DC cable 170 are thus directly connected by the crimp terminal 175 instead of the bolt and nut 172.

  With such a configuration, the contact resistance between the terminal 121 and the DC cable 170 can be reduced, and noise generated between the terminal 121 and the DC cable 170 can be reduced. As a result, the current sensor 131 is suppressed from being affected by noise that is suppressed between the terminal 121 and the DC cable 170.

  The embodiment of the present invention described above is merely an example of the configuration showing the present invention, and is not necessarily limited to this configuration. Further, the configurations of the first to seventh embodiments may be combined.

  Further, the control board 150 may be configured by a flexible board having flexibility.

  Further, although the control board 150 is arranged on the outer peripheral side of the power module 60, each power is provided on the inner peripheral side of the power module 60, that is, on the 120 a side formed by the annular DC bus bar 120 and the first board 130. A control board 150 may be provided corresponding to the module 60. The control board 150 may be provided corresponding to each power module 60, or may be formed so as to surround the plurality of power modules 60 with a flexible board or the like.

  In the first to seventh embodiments described above, the configuration of three-phase two-para, five-phase two-para, three-phase three-para is described as an example, but the present invention is not limited to this. Any configuration may be used as long as it is a power converter that controls N-phase (N is 2 or more) AC power in M parallel (M is 2 or more).

DESCRIPTION OF SYMBOLS 1 Drive system 10 Control apparatus 40 Smoothing capacitor 50 Power converter 100 Cooler 110 Power module 111 PN terminal 112 AC terminal 113 Control signal terminal 114 AC bus bar 120 DC bus bar 120a Hollow part 121, 122 terminal 130 1st board | substrate 131 Current sensor 132 Pad 133 Signal terminal 134, 135 Notch 150 Control board 160 Third board

Claims (7)

A plurality of power modules comprising switching elements;
A base comprising a cooler for cooling the power module;
A first bus bar for supplying power to the power module;
A plurality of second bus bars for outputting power from the power module;
A board having a current sensor for detecting a current of the second bus bar,
A plurality of the power modules are mounted radially on the upper surface of the base,
Above the power module, the first bus bar and the substrate are sequentially stacked and provided,
The plurality of second bus bars are extended from each of the plurality of power modules on the outer peripheral side of the substrate in the standing direction from the base,
The current sensor is arranged corresponding to each of the plurality of second bus bars. The first bus bar has a terminal extending upward,
2. The power converter according to claim 1, wherein the substrate is formed with a notch portion in which a position corresponding to the terminal is notched between locations where the plurality of current sensors are arranged. .   The power conversion device according to claim 2, wherein the cutout portion is formed as a set on an outer periphery of the substrate, and the set of cutout portions is formed at positions facing each other.   The power converter according to any one of claims 1 to 3, wherein the substrate is formed in an annular shape.   5. The electric power according to claim 1, wherein a capacitor for smoothing the electric power of the first bus bar is disposed between the first bus bar and the substrate. Conversion device. The substrate is
A first board on which the current sensor is mounted; and a second board on which a control circuit for controlling the current sensor is mounted;
The power conversion device according to claim 1, wherein the first substrate is disposed above the second substrate. When the power conversion device controls N-phase AC power in M parallel (N, M is 2 or more) and (N-1) × M current sensors are arranged,
7. The power conversion according to claim 2, wherein the notch is provided at a position corresponding to a power module in which the current sensor is not arranged among N × M power modules. 8. apparatus.

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