JP6005381B2 - Power converter - Google Patents

Description

  The present invention relates to a power conversion device, and more particularly to a power conversion device including a current detection unit that detects a current from a semiconductor element that performs a switching operation by a non-contact type magneto-electric current sensor element.

In recent years, electric vehicles equipped with an electric motor as a driving force source have become widespread. An electric vehicle performs control to convert DC power supplied from a battery into AC power and supply it to an electric motor, and also converts AC power generated by a regenerative mechanism during braking to DC power into a battery. Power control unit (PEU: Power Electronic) that controls to store electricity
Unit).

  Such a power control device is a power conversion device if attention is paid to the function of converting power and supplying it to an external device. The power control device detects the output of an alternating current and converts it so that a stable output is obtained based on the detected value. The operation is adjusted. In order to detect the output of such AC power, a configuration has been proposed in which a magnetic current generated by a current to be detected flowing through a connection conductor is detected by a magnetic sensor to detect the current to be detected.

  Patent Document 1 relates to a current detection device that obtains a current flowing through a connecting conductor by measuring a magnetic flux generated by a current flowing through a connecting conductor having a bent portion, and has a sensing surface disposed in the bent portion and connected. The structure provided with the magnetic flux detection element which converts the magnetic flux by the electric current which flows through a conductor into an electric signal is disclosed.

JP-A-2005-321206

  However, according to the study of the present inventor, in the configuration of Patent Document 1, since the magnetic flux detection element is arranged near the bent portion of the connection conductor, the magnetic flux detection element is arranged in the vertical direction and the horizontal direction of the connection conductor. In addition to the magnetic flux, it tends to be difficult to accurately detect the current by detecting the magnetic flux in the oblique direction caused by the bent portion. In particular, in the bent portion, a strong magnetic flux is generated in an oblique direction due to the concentration of the current, so that the magnetic flux detection element tends to be difficult to accurately detect the current.

  The present invention has been made through the above studies, and an object thereof is to provide a power conversion device that can accurately detect a current to be detected with a simple configuration.

In order to achieve the above object, a first aspect of the present invention includes at least one semiconductor element that performs a switching operation, and a magnetoelectric conversion type current sensor element that detects a current from the semiconductor element. A power conversion device comprising a connection conductor that is a block structure that electrically connects an output terminal of the semiconductor element and a connection terminal of an external device, the connection conductor extending in a first direction, A first connection conductor connected to the output terminal of the semiconductor element; and a first connection conductor extending from the first connection conductor in a second direction orthogonal to the first direction and connected to a connection terminal of an external device. Two connection conductors, wherein the first connection conductor and the second connection conductor are connected via an inclined shape portion, and the current sensor element corresponds to the second connection conductor. disposed Te, wherein at least one of the semiconductor The element includes two semiconductor elements facing each other in the first direction, and the connection conductor electrically connects the output terminal of the two semiconductor elements and the connection terminal of the external device. The structure includes the third connection conductor that connects the first connection conductor and the second connection conductor, and the first connection conductor is the output terminal of the two semiconductor elements. connected to the third connection conductor, which has the inclined shaped portion, a power conversion device to connect to branch between said first connecting conductor and the second connecting conductor.

In addition to the first aspect, the second aspect of the present invention is a power conversion device in which the inclined shape portion of the third connection conductor is an R shape portion.

Further, according to a third aspect of the present invention, in addition to the first or second aspect, the position of the upper end portion of the current sensor element is a connection between the first connection conductor and the third connection conductor. The position of the end of the current sensor element on the side of the third connection conductor is lower than the connection position of the second connection conductor and the third connection conductor. It is the power converter device located in the conductor side.

In the power conversion device according to the first aspect of the present invention, the connection conductor, which is a block structure that electrically connects the output terminal of the semiconductor element and the connection terminal of the external device , extends in the first direction, A first connection conductor connected to the output terminal of the semiconductor element performing the switching operation, and a first connection conductor extending from the first connection conductor in a second direction orthogonal to the first direction and connected to the connection terminal of the external device. Two connection conductors, the first connection conductor and the second connection conductor are connected via the inclined shape portion, and the current sensor element is arranged corresponding to the second connection conductor. By being provided, the concentration of current near the connection portion between the first connection conductor and the second connection conductor can be reduced and the magnetic flux in the oblique direction can be reduced, and the magnetic flux in the oblique direction with respect to the current sensor element can be reduced. Can reduce the effects of They are possible to accurately detect. In addition, since the connection conductor is a block structure, the output terminal of the semiconductor element and the connection terminal of the external device can be electrically connected without preparing a separate terminal block.

In the power conversion device according to the first aspect of the present invention, the connection is a block structure that electrically connects the output terminals of the two semiconductor elements facing each other in the first direction and the connection terminals of the external device. A conductor having an inclined shape part for connecting the first connection conductor and the second connection conductor, and a third connection conductor for branching and connecting between the first connection conductor and the second connection conductor; By providing, the current flowing through the connection conductor can be dispersed, the concentration of current near the connection portion between the first connection conductor and the second connection conductor is further reduced, and the generation of magnetic flux in an oblique direction is generated. Since the influence of the magnetic flux in the oblique direction on the current sensor element can be further reduced, the current to be detected can be detected more accurately. In addition, since a through hole can be formed in the branching portion of the third connection conductor, an extra portion of the material of the connection conductor can be reduced and the cost can be reduced.

Further, in the power conversion device according to the second aspect of the present invention, the inclined connecting portion of the third connecting conductor is an R-shaped portion, whereby the connecting portion between the first connecting conductor and the second connecting conductor. The current concentration in the vicinity can be further relaxed and the generation of magnetic flux in the oblique direction can be further reduced, and the influence of the magnetic flux in the oblique direction on the current sensor element can be further reduced, so that the current to be detected can be more accurately detected. Can be detected.

In the power conversion device according to the third aspect of the present invention, the position of the upper end portion of the current sensor element is lower than the connection position between the first connection conductor and the third connection conductor, and the current sensor element. The position of the end portion on the third connection conductor side of the second connection conductor is positioned on the second connection conductor side with respect to the connection position between the second connection conductor and the third connection conductor. The magnetic flux in the direction can be generated at a position higher than the position where the current sensor element is arranged, and the influence of the magnetic flux in the oblique direction on the current sensor element can be further reduced, so that the current to be detected can be detected more accurately. can do.

FIG. 1 is a perspective view showing a configuration of a power conversion device according to an embodiment of the present invention. FIG. 2 is an enlarged partial longitudinal sectional view schematically showing the power conversion device cut along the AA cutting line shown in FIG. 1.

  Hereinafter, a power converter according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate.

  FIG. 1 is a perspective view showing a configuration of a power conversion device according to an embodiment of the present invention. FIG. 2 is an enlarged partial longitudinal sectional view schematically showing the power conversion device cut along the AA cutting line shown in FIG. 1. In the figure, the x-axis, y-axis, and z-axis form a three-axis orthogonal coordinate system, the z-axis direction is the vertical direction, and the xy plane is the horizontal plane.

[Control system configuration]
First, the configuration of a control system to which the power conversion device according to this embodiment is applied will be described in detail.

  The power conversion device 1 in the present embodiment shown in FIGS. 1 and 2 typically includes an electric motor that is a driving force source and a battery that is a secondary battery, although both are not illustrated. It is mounted on an electric vehicle equipped with a regenerative mechanism that generates regenerative power during deceleration. The power conversion device 1 is used in an electric vehicle alone or under the control of a control device (not shown) that comprehensively controls the electric motor, the battery, and the regeneration mechanism. The supply can be controlled and the supply of regenerative power from the regenerative mechanism to the battery can be controlled.

  For example, when a three-phase alternating current is used as the drive current of the electric motor, the power conversion device 1 stably converts the direct current supplied from the battery into a three-phase alternating current of U phase, V phase, and W phase. Then, the function of the DC / AC converter that supplies the alternating current to the electric motor, and the AC / AC that stably converts the regenerative alternating current generated from the regenerative mechanism into a direct current and supplies the direct current to the battery. DC converter function. The power conversion device 1 has only a DC / AC converter function that stably converts a direct current supplied from a battery into an alternating current as necessary and supplies the alternating current to the electric motor. May be.

  The electric motor is, for example, a three-phase brushless electric motor that operates by supplying three-phase AC power, and supplies a driving force for driving an electric vehicle. The battery is typically a nickel metal hydride or lithium ion secondary battery, supplies electric power necessary for an electric motor and other auxiliary machines, and stores regenerative power generated from a regenerative mechanism.

The power conversion device 1 can also be applied to a hybrid vehicle equipped with an engine such as an internal combustion engine in addition to an electric motor, and a fuel cell vehicle equipped with a fuel cell. When the power conversion device 1 is applied to a hybrid vehicle, the power conversion device 1 can control supply of drive power from the battery to the electric motor, supply regenerative power from the regenerative mechanism to the battery, and supplement the engine. It is possible to control the supply of generated power from the generator, which is a machine, to the battery. When the power conversion device 1 is applied to a fuel cell vehicle, the power conversion device 1 can control the supply of drive power from the fuel cell to the electric motor and can control the supply of regenerative power from the regenerative mechanism to the battery. It is. In addition, when the power conversion device 1 is applied to any of an electric vehicle, a hybrid vehicle, and a fuel cell vehicle, the power conversion device 1 can generate regenerative power from the electric motor to the battery during braking or the like as necessary. It is also possible to control the supply.

[Configuration of power converter]
Next, with respect to the configuration of the power conversion device 1 in the present embodiment, a case where the direct current from the battery is converted into a three-phase alternating current composed of three phases of the U phase, the V phase, and the W phase and supplied to the electric motor. An example will be described in detail.

  As shown in FIGS. 1 and 2, the power conversion device 1 according to the present embodiment includes three first switching devices mounted on one surface 11 </ b> A as the inner surface of the first cooling member 11. The semiconductor element 12, three second semiconductor elements 14 mounted on one surface 13A as the inner surface of the second cooling member 13 and performing a switching operation, and typically extending in the vertical direction , Which has a rectangular cylindrical side wall 21 and is typically an integrally molded product made of a resin such as PPS (polyphenylene sulfide) resin, three first semiconductor elements 12 and three second semiconductor elements. A control circuit board on which a control IC (Integrated Circuit) (not shown) for controlling the switching operation of the semiconductor element 14 is mounted, and typically a rectangular flat circuit board 31 is mainly used. It is provided. In FIG. 2, the three first semiconductor elements 12 and the three second semiconductor elements 14 are each shown for a W-phase alternating current. Also, the three first semiconductor elements 12 and the three second semiconductor elements 14 may all be integrated into one semiconductor element to exhibit the same function, and the alternating current of the same phase may be generated. Any combination of the first semiconductor element 12 and the second semiconductor element 14 to be generated may be integrated into one semiconductor element to exhibit the same function.

  The first cooling member 11 is typically made of an aluminum alloy and is fixed to the case 22, and functions as a heat sink that receives heat generated during operation of the three first semiconductor elements 12 and dissipates the outside. It has a function as a mounting member for mounting the three first semiconductor elements 12 and a function as a lid for closing the opening of the case 22. The three first semiconductor elements 12 are mounted on the first cooling member 11 with an insulating sheet (not shown) interposed therebetween in a manner arranged along the x-axis direction.

  One surface 11A of the first cooling member 11 is configured as a flat plane having no step to mount the three first semiconductor elements 12, and the other surface 11B on the opposite side has a heat dissipation efficiency. In order to enhance, a plurality of radiating fins 11C are arranged in a regularly arranged manner. The first cooling member 11 is provided with various mounting through-holes 11D and the like, which are preferably closed with a plug or the like not shown for waterproofing or dustproofing as necessary. .

The configuration of each of the three first semiconductor elements 12 is the same, but each one is correspondingly applied for U-phase AC current, V-phase AC current, and W-phase AC current. The first semiconductor element 12 applied for the W-phase alternating current will be described as a representative example. The first semiconductor element 12 has a low-side switching function for generating a low-potential-side alternating current. That is, the first semiconductor element 12 includes a semiconductor chip (not shown), a sealing body 12a that is a resin package that seals the semiconductor chip, a terminal that extends from the end of the sealing body 12a, and the like. And a connection lead extending upward from the sealing body 12a and not shown. In FIG. 2, the sealing body 1
As the terminal extending from the end of 2a, only the output terminal 12b on the negative direction side of the y axis is shown.

  The second cooling member 13 has the same configuration as that of the first cooling member 11, but is fixed to the case 22 while facing the first cooling member 11 in an upside down manner. A function as a heat sink that receives heat generated during the operation of the semiconductor element 14 and dissipates it to the outside, a function as a mounting member for mounting the second semiconductor element 14, and a function as a lid that closes the opening of the case 22 And have. The three second semiconductor elements 14 are mounted on the second cooling member 13 with an insulating sheet (not shown) interposed therebetween in a manner arranged along the x-axis direction.

  One surface 13A of the second cooling member 13 is configured as a flat plane having no step to mount the three second semiconductor elements 14, and the other surface 13B on the opposite side has heat dissipation efficiency. In order to enhance, a plurality of heat radiation fins 13C are arranged in a regularly arranged manner. The second cooling member 13 is provided with various through holes 13D for attachment.

  The configuration of each of the three second semiconductor elements 14 is the same as the configuration of the three first semiconductor elements 12. The second semiconductor element 14 applied for the W-phase alternating current will be described as a representative example. The second semiconductor element 14 has a high-side switching function for generating a high-potential-side alternating current. A resin sealing body 14a which is a package for sealing a semiconductor chip to be omitted, a terminal and the like extending from an end of the sealing body 14a, and a connection extending upward from the sealing body 14a and not shown in the figure. A lead. In FIG. 2, only the output terminal 14b on the negative side of the y axis is shown as a terminal extending from the end of the sealing body 14a.

  The circuit board 31 is typically a PCB (Printed Circuit Board), and various elements such as a control IC, a resistance element, and a capacitor (not shown) are provided on the surface (upper surface) while being electrically connected to the printed wiring. It is a control circuit board mounted on the side surface. The circuit board 31 is inserted between the first semiconductor element 12 and the second semiconductor element 14 in the case 22 by inserting a fastening member (not shown) into the fixing hole, so that the circuit board 31 is appropriately separated from each other. In this state, the case 22 is mounted so as to be parallel to the horizontal plane. Thereby, the circuit board 31, the control IC, and the control current path thereof can be kept away from the first semiconductor element 12, the second semiconductor element 14, and the current path through which a relatively large current flows during their operation. The influence of unnecessary heat and electromagnetic waves on the circuit board 31 and the like can be reduced and their durability can be improved.

  Here, the power conversion device 1 includes a single positive conductor 41 (P), a single negative conductor (not shown), the first semiconductor element 12, and the second semiconductor device, all of which are attached to the case 22. Corresponding to the arrangement direction of the semiconductor elements 14, a total of three connection conductors 42 (U), 42 (V), and 42 (W) arranged along the x direction are provided.

  The positive electrode conductor 41 (P) and the negative electrode conductor (not shown) function as power supply input wiring when electric power is supplied to the electric motor and is electrically connected to the battery. Specifically, the positive conductor 41 (P) is electrically connected to the positive terminal of the battery, and the negative conductor, not shown, is electrically connected to the negative terminal of the battery. When charging the battery, the positive electrode conductor 41 (P) and the negative electrode conductor (not shown) function as output wiring.

Each of the connection conductors 42 (U), 42 (V), and 42 (W) is typically made of an aluminum alloy, and the first connection conductor 43 that is an upright block portion extending in the vertical direction, A first connecting conductor 43 and a second connecting conductor 44 which is an extended block portion extending in the negative direction of the y-axis, and the first connecting conductor 43 and the second connecting conductor 44. And a third connection conductor 45 that connects the two, and is integrally formed of a T-shaped conductive block structure in a longitudinal section parallel to the yz plane. The first connection conductor 43 is provided with a pair of upper and lower fastening holes 46A and 46B having female threads, and a fastening hole 47 having a female thread is provided at the end of the second connection conductor 44 on the negative direction side of the y-axis. Provided.

  The connection conductors 42 (U), 42 (V), and 42 (W) are respectively connected to the corresponding first semiconductor element 12 and the second semiconductor element by using the fastening members 48A and 48B and the pair of fastening holes 46A and 46B. The output terminals 12 b and 14 b of the semiconductor element 14 are electrically connected to the first semiconductor element 12 and the second semiconductor element 14 while being mechanically fastened.

  In addition, the connection conductors 42 (U), 42 (V), and 42 (W) are respectively connected to the U phase, the V phase, and the W of the corresponding electric motor by using a fastening member and a fastening hole 47 that are not shown. Electrically connected to the electric motor while mechanically fastening the phase drive current input terminals. Thereby, the connection conductors 42 (U), 42 (V), and 42 (W) function as output wiring for a three-phase alternating current when electrically connected to the electric motor and supplying electric power to the electric motor.

  Here, the third connection conductor 45 is an R-shaped outer shape in contact with each other in a longitudinal section parallel to the yz plane at the connection portion between the upper standing portion of the first connection conductor 43 and the second connection conductor 44. And has an R shape that is in contact with each other in a longitudinal section parallel to the yz plane at the connection portion between the lower standing portion of the first connection conductor 43 and the second connection conductor 44. The lower branch portion 45B having the outer shape is integrally provided. A through hole 45C penetrating in the x-axis direction is formed between the upper branch portion 45A and the lower branch portion 45B.

  Each of the connection conductors 42 (U), 42 (V), and 42 (W) is preferably formed by extruding one columnar base material in the x-axis direction with a pressing die. At this time, the first connecting conductor 43, the second connecting conductor 44, and the third connecting conductor 45 are formed at a time, and in particular, the upper branch portion 45A provided with the R-shaped outer shape, the R-shaped outer shape. The assigned lower branch 45B and the through hole 45C penetrating in the x-axis direction between them are formed at a time. That is, when the connection conductors 42 (U), 42 (V), and 42 (W) have a simple linear or plate configuration, the first connection conductor 43, the second connection conductor 44, and the third Although it is impossible to form a complex model composed of the connecting conductor 45 from the same base material at the same time, by forming a block structure, such a complex model can be molded from the same base material at a time. It is possible to do. The through hole 45C is formed as a hole in relation to the material flow of the base material at the time of extrusion.

  Furthermore, the power converter 1 detects a U-phase alternating current flowing through the connection conductor 42 (U), a V-phase alternating current flowing through the connection conductor 42 (V), and a W-phase alternating current flowing through the connection conductor 42 (W). The non-contact type three current sensor elements 51 are provided. The current sensor 51 is typically a coreless magnetoelectric conversion current sensor having a Hall element, and the second connection conductor 44 in the corresponding connection conductors 42 (U), 42 (V), and 42 (W). A magnetic flux that is mounted on the extension S that extends the circuit board 31 at a position immediately above it, and a magnetic flux generated by a W-phase alternating current flowing through the second connection conductor 44 is vertically incident. Has a sense direction. The current sensor 51 may be attached and fixed to the case 22 with an insulating sheet interposed. In FIG. 2, the three current sensor elements 51 are for W-phase alternating current.

Here, the three current sensor elements 51 have the upper ends of the three current sensor elements 51 and the first connection conductors 43 in the corresponding connection conductors 42 (U), 42 (V), and 42 (W). The connection position with the third connection conductor 45, that is, the lower end position P1 on the upper side of the R shape of the upper branch portion 45A, and the ends of the three current sensor elements 51 on the positive side of the y axis are , The connection position of the second connection conductor 44 and the third connection conductor 45 in the corresponding connection conductors 42 (U), 42 (V), 42 (W), that is, the lower side of the R shape of the upper branch portion 45A. It arrange | positions so that it may be located in the negative direction side of ay axis rather than R stop position P2. Note that the curvature of the R shape may not be constant, and instead of the R shape outer shape, a linear outer shape connecting the position P1 and the position P2 may be provided. The outer shape may be composed of a plurality of straight lines.
[Operation of power converter]
Next, when the operation of the power conversion device 1 having the above configuration is supplied to the electric motor by converting the direct current from the battery into a three-phase alternating current composed of three phases of the U phase, the V phase, and the W phase. Will be described in detail by taking as an example.

  When a direct current from the battery is supplied to the three first semiconductor elements 12 and the three second semiconductor elements 14 in a state where the control IC that controls the switching operation of the circuit board 31 is in operation, such control is performed. The IC controls the switching operation of the three first semiconductor elements 12 and the three second semiconductor elements 14, so that the supplied DC current is composed of three phases of U phase, V phase, and W phase. Converted to three-phase alternating current.

  And the three-phase alternating current obtained in this way is supplied to an electric motor via the connection conductors 42 (U), 42 (V), and 42 (W).

  At this time, the three current sensor elements 51 have upper end portions corresponding to the first connection conductor 43 and the third connection conductor 45 in the corresponding connection conductors 42 (U), 42 (V), and 42 (W). , That is, lower end position P1 on the upper side of the R shape of upper branching portion 45A, and the end portion on the positive direction side of the y-axis is a corresponding connecting conductor 42 (U), 42 ( V), the connection position of the second connection conductor 44 and the third connection conductor 45 in 42 (W), that is, the negative direction side of the y-axis with respect to the lower R stop position P2 of the R shape of the upper branch portion 45A. , The U-phase alternating current, the V-phase alternating current flowing correspondingly through the second connecting conductors 44 of the connecting conductors 42 (U), 42 (V), 42 (W), and Magnetic flux generated around the second connection conductor 44 due to the W-phase AC current , It enters the magnetic flux sensitive direction of the corresponding current sensor element 51. On the other hand, the magnetic flux generated by the magnetic field caused by the U-phase alternating current, the V-phase alternating current, and the W-phase alternating current flowing correspondingly through the first connection conductor 43 is mainly present above the current sensor element 51. At the same time, since it is orthogonal to the magnetic flux sensing direction of the current sensor element 51, the detection operation of the current sensor element 51 is not unnecessarily affected. Further, the magnetic flux generated by the magnetic field generated due to the U-phase alternating current, the V-phase alternating current, and the W-phase alternating current flowing correspondingly through the third connection conductor 45 intersects the magnetic flux sensing direction of the current sensor element 51. At the same time, since the distance between the current sensor element 51 and the third connection conductor 45 is relatively long, the influence on the detection operation of the current sensor element 51 becomes a magnetic flux density at a level that can be ignored in practice. Substantially unnecessarily affect the detection operation.

Then, the current sensor element 51 detects the magnitude of the magnetic flux density of the incident magnetic flux and outputs a current having a magnitude corresponding thereto to the control IC mounted on the circuit board 31 as a current signal. The control IC performs stabilization control of the three-phase alternating current output using the received current signal.
[Assembly of power converter]
Next, a method for assembling the power conversion device 1 having the above configuration will be described in detail.

When assembling the power converter 1, first, the three first semiconductor elements 12 positioned and fixed on the surface 11A of the first cooling member 11 are accommodated in the case 22, and the first cooling is performed. The first semiconductor element 12 is fixed to the case 22 by bringing the surface 11A of the first cooling member 11 into contact with the lower end of the case 22 while exposing the surface 11B of the member 11 to the outside of the case 22. The cooling member 11 is attached and fixed.

  Next, the positive electrode conductor 41 (P), the negative electrode conductor (not shown), and the connection conductors 42 (U), 42 (V), and 42 (W) are inserted into the through holes 22 </ b> A formed in the side wall 21 of the case 22. Then, each conductor is fixed to a fixing portion (not shown) provided on the side wall of the case 22 and the current sensor 51 is connected to the second connection conductor 42 (U), 42 (V), 42 (W). The circuit board 31 is mounted on the extended portion S and fixed immediately above the connection conductor 44.

  Next, by inserting a fastening member (not shown) into the fixing hole while positioning with respect to the case 22, the first semiconductor element 12, and the connection conductors 42 (U), 42 (V), 42 (W). The circuit board 31 on which a control IC or the like is mounted is placed and fixed in the case 22. At this time, by inserting a positioning pin (not shown) provided on the first semiconductor element 12 side into a positioning hole (not shown) formed in the circuit board 31, the first semiconductor is inserted into the circuit board 31. The element 12 is positioned and electrically connected.

  Next, the three second semiconductor elements 14 positioned and fixed on the surface 13A of the second cooling member 13 are accommodated in the case 22 and the surface 13B of the second cooling member 13 is placed on the case 22. The surface 13A of the second cooling member 13 is brought into contact with the upper end of the case 22 while being exposed to the outside, whereby the second cooling member 13 having the second semiconductor element 14 fixed thereto is attached and fixed to the case 22. . At this time, by inserting a positioning pin (not shown) provided on the second semiconductor element 14 side into a positioning hole (not shown) formed in the circuit board 31, the second semiconductor is inserted into the circuit board 31. The element 14 is positioned and electrically connected.

  Next, a fastening tool (not shown) is sequentially inserted into the case 22 from the through-hole 11D of the first cooling member 11, and the fastening member 48B is fastened into the fastening hole 46B, whereby the first semiconductor element 12 is secured. The corresponding connection conductors 42 (U), 42 (V), and 42 (W) are fastened and electrically connected. Next, the second semiconductor element 14 is tightened by tightening the fastening member 48A into the fastening hole 46A while sequentially inserting a fastening tool (not shown) from the through hole 13D of the second cooling member 13 into the case 22. The corresponding connection conductors 42 (U), 42 (V), and 42 (W) are fastened and electrically connected.

  Finally, if necessary, the power converter 1 is assembled by closing the through hole 11D of the first cooling member 11 and the through hole 13D of the second cooling member 13 with a grommet or the like not shown. Complete.

  As is clear from the above description, in the power conversion device 1 according to the present embodiment, the first connection conductor 43 and the second connection conductor 44 are connected with an inclination. As a result, the concentration of current in the vicinity of the connection portion between the first connection conductor 43 and the second connection conductor 44 can be reduced and the generation of magnetic flux in the oblique direction can be reduced. Since the influence of the magnetic flux can be reduced, the current to be detected can be accurately detected. In addition, since the connection conductors 42 (U), 42 (V), and 42 (W) are block structures, the output terminals of the semiconductor elements 12 and 14 and the connection terminals of external devices can be used without preparing a separate terminal block. Can be electrically connected.

In the power conversion device 1 according to the present embodiment, the third connection conductor 45 is branched and connected between the first connection conductor 43 and the second connection conductor 44. Thereby, the current flowing through the connection conductors 42 (U), 42 (V), 42 (W) can be dispersed, and the current in the vicinity of the connection portion between the first connection conductor 43 and the second connection conductor 44. Can be more relaxed and the generation of magnetic flux in the oblique direction can be further reduced, and the influence of the magnetic flux in the oblique direction on the current sensor element 51 can be further reduced, so that the current to be detected can be detected more accurately. be able to. In addition, since the through hole 45C is formed in the branching portion of the third connection conductor 45, it is possible to reduce an extra portion of the material of the connection conductors 42 (U), 42 (V), and 42 (W). The cost of the connection conductors 42 (U), 42 (V), and 42 (W) can be reduced.

  Moreover, in the power converter device 1 in this embodiment, the 3rd connection conductor 45 has R shape. Accordingly, the concentration of current near the connection portion between the first connection conductor 43 and the second connection conductor 44 can be further relaxed, and the generation of the magnetic flux in the oblique direction can be further reduced. Since the influence of the magnetic flux in the direction can be further reduced, the current to be detected can be detected more accurately.

  In the power conversion device 1 according to the present embodiment, the position of the upper end portion of the current sensor element 51 is lower than the connection position P1 between the first connection conductor 43 and the third connection conductor 45, and the current sensor element. 51 is located closer to the second connection conductor 44 than the connection position P <b> 2 between the second connection conductor 44 and the third connection conductor 45. Thereby, the magnetic flux generated in the horizontal direction with respect to the current sensor element 51 can be generated at a position higher than the arrangement position of the current sensor element 51, and the influence of the magnetic flux in the oblique direction on the current sensor element is further reduced. Therefore, the current to be detected can be detected more accurately.

  In the present invention, the shape, arrangement, number, and the like of the members are not limited to the above-described embodiments, and the components depart from the gist of the invention, such as appropriately replacing the constituent elements with those having the same effects. Of course, it can be appropriately changed within the range not to be.

  As described above, in the present invention, a power converter that can accurately detect a current to be detected can be provided with a simple configuration. It is expected to be applicable to the field of semiconductor control devices such as power conversion devices.

DESCRIPTION OF SYMBOLS 1 ... Power converter 11 ... 1st cooling member 11A, 11B ... Surface 11C ... Radiation fin 11D ... Through-hole 12 ... 1st semiconductor element 12a ... Sealing body 12b ... Terminal 13 ... 2nd cooling member 13A, 13B ... Surface 13C ... Radiation fin 13D ... Through hole 14 ... Second semiconductor element 14a ... Sealing body 14b ... Terminal 21 ... Side wall 22 ... Case 22A ... Through hole 31 ... Circuit board 41 (P) ... Positive electrode conductor 42 (U) , 42 (V), 42 (W) ... connecting conductor 43 ... first connecting conductor 44 ... second connecting conductor 45 ... third connecting conductor 45A ... upper branch 45B ... lower branch 45C ... through hole 46A , 46B, 47 ... Fastening holes 48A, 48B ... Fastening members 51 ... Current sensor element

Claims (3)

A power conversion device comprising at least one semiconductor element that performs a switching operation, and a magnetoelectric conversion type current sensor element that detects a current from the semiconductor element,
A connection conductor that is a block structure that electrically connects an output terminal of the semiconductor element and a connection terminal of an external device,
The connection conductor extends in a first direction, and is connected to the output terminal of the semiconductor element, and a second direction orthogonal to the first direction from the first connection conductor. And a second connection conductor that connects to a connection terminal of an external device, and the first connection conductor and the second connection conductor are connected via an inclined shape portion,
The current sensor element is disposed corresponding to the second connection conductor ,
The at least one semiconductor element includes two semiconductor elements opposed in the first direction, and the connection conductor electrically connects the output terminal of the two semiconductor elements and the connection terminal of the external device. A block structure for connecting the first connecting conductor and the second connecting conductor, the third connecting conductor connecting the first connecting conductor and the second connecting conductor, wherein the first connecting conductor includes the two semiconductors. connected to the output terminal of the element, the third connection conductor, which has the inclined shape portion, that you branched and connected between said first connecting conductor and the second connecting conductor A power conversion device. The power converter according to claim 1 , wherein the inclined shape portion of the third connection conductor is an R shape portion. The position of the upper end portion of the current sensor element is lower than the connection position of the first connection conductor and the third connection conductor, and the end of the current sensor element on the third connection conductor side is lower. position, power converter according to claim 1 or 2, characterized in that it is positioned in the second connecting conductor side of the connection position between the second connection conductor and the third connection conductor .

Images