Power conversion device and electric vehicle

Abstract

A power conversion device (100) comprises: a substrate (50) having through-holes (51a, 51b, 51c); bus bars (40a, 40b, 40c) connected to a power module and disposed to face the substrate (50); cores (10a, 10b, 10c) that are cylindrical bodies surrounding the bus bars (40a, 40b, 40c) and having notches that have pairs of protrusions (11a, 11b, 11c) formed along the notches; and magnetoelectric conversion elements (20a, 20b, 20c) disposed on the substrate (50). At least one of the pairs of protrusions (11a, 11b, 11c) of the cores (10a, 10b, 10c) is inserted into the through-holes (51a, 51b, 51c) and fixed to the substrate (50), and the magnetoelectric conversion elements (20a, 20b, 20c) are disposed in the notch portions of the cores (10a, 10b, 10c) or in the gaps between the pairs of protrusions (11a, 11b, 11c) of the cores (10a, 10b, 10c).

Description

Power conversion device and electric vehicle

[0001] The present application relates to a power conversion device and an electric vehicle.

[0002] Electric vehicles, such as electric vehicles and hybrid vehicles, that use a motor as a drive source are equipped with multiple power conversion devices. The power conversion devices are used to drive the motor or to regenerate drive energy into a battery. Specific power conversion devices include a charger that converts a commercial AC power source into DC power to charge a high-voltage battery, a DC / DC converter that converts the DC power of the high-voltage battery into a voltage (e.g., 12 V) for a battery for auxiliary equipment, and an inverter that converts DC power from the battery into AC power for the motor.

[0003] In addition to elements that switch large currents and calculation circuits that control the power conversion function, a power conversion device is equipped with a current sensor that measures the current flowing through the busbars. As a result of the large number of electrical components contained within the power conversion device, there is a problem in that the size of the power conversion device increases.

[0004] In order to prevent the power conversion device from becoming large, a configuration in which a current sensor is integrally formed with other components has been disclosed (see, for example, Patent Document 1). The current sensor is composed of a bus bar, a C-shaped core made of a magnetic material, and a magnetoelectric conversion element, with the bus bar being disposed inside the C-shaped core and the magnetoelectric conversion element being provided in the gap of the C-shaped core.

[0005] The C-shaped core allows for a short gap length at the notch, enhancing the magnetic flux collection effect on the magnetoelectric transducer. For this reason, C-shaped cores are often used as magnetic cores for current sensors. The magnetoelectric transducer is connected to a circuit board and detects magnetic flux generated in the notch due to current flowing through the bus bar. The core includes a shielding section to reduce the influence of external magnetic fields on the magnetoelectric transducer.

[0006] Patent No. 6372969

[0007] In the above-mentioned Patent Document 1, the side portion of the C-shaped core extends opposite the bottom portion of the C-shaped core, and the current sensor and shield portion are formed integrally.This allows the high magnetic collection effect of the C-shaped core to be maintained while reducing the influence of external magnetic fields on the magnetoelectric conversion element, thereby making it possible to miniaturize the power conversion device.

[0008] However, there was a problem that the magnetoelectric conversion element mounted on the substrate could be displaced from its predetermined position in the gap part of the core due to external forces such as vibration, which reduced the current detection accuracy of the power conversion device. Also, as the power conversion device becomes smaller, the relative distance between each electrical component becomes smaller, which increases the influence of external magnetic fields on the gap part of the core, which necessitates a larger shield part in order to reduce the influence of external magnetic fields.

[0009] Therefore, the present application aims to obtain a power conversion device that can improve the positioning accuracy of the magnetoelectric conversion element relative to the gap portion of the core, thereby improving current detection accuracy, while maintaining the high magnetic collection effect of the core and the compactness of the power conversion device, and can reduce the influence of external magnetic fields on the gap portion of the core.

[0010] The power conversion device disclosed in the present application comprises: a substrate having a through hole; a bus bar connected to a power module and arranged to face the substrate; a core that surrounds the bus bar and is a cylindrical body having a notch and has a pair of protrusions formed along the notch; and a magnetoelectric conversion element that is arranged on the substrate and converts a detected magnetic field into an electric signal, wherein at least one of the pair of protrusions of the core is inserted into the through hole and fixed to the substrate, and the magnetoelectric conversion element is arranged in the notch portion of the core or in the gap between the pair of protrusions of the core.

[0011] According to the power conversion device disclosed in the present application, the protruding portion of the core made of a magnetic material is inserted into one or more through holes provided in the substrate, and the magnetoelectric conversion element is disposed in a portion of the substrate near the through holes, so that the core maintains a high magnetic collection effect while also serving as a positioning element relative to the substrate. Therefore, it is possible to obtain a power conversion device that can improve the positioning accuracy of the magnetoelectric conversion element relative to the gap portion of the core, thereby improving current detection accuracy, and reducing the influence of external magnetic fields on the gap portion of the core.

[0012] FIG. 1 is a schematic diagram showing a general configuration of a power conversion device according to embodiment 1. FIG. 2 is a perspective view showing a main part of the power conversion device according to embodiment 1. FIG. 3 is a front view showing a main part of the power conversion device according to embodiment 1. FIG. 4 is a front view for explaining a current sensor of the power conversion device according to embodiment 1. FIG. 5 is a front view for explaining the structure of a current sensor of the power conversion device according to embodiment 1. FIG. 6 is a plan view showing a main part of a power conversion device according to embodiment 2. FIG. 7 is a front view showing a main part of a power conversion device according to embodiment 2. FIG. 8 is a front view showing a main part of a power conversion device according to embodiment 3. FIG. 9 is a front view showing a main part of a power conversion device according to embodiment 4. FIG. 10 is a front view showing a main part of a power conversion device according to embodiment 5.

[0013] Hereinafter, a power conversion device according to an embodiment of the present invention will be described with reference to the drawings. Note that the same or equivalent members and parts in each drawing will be denoted by the same reference numerals.

[0014] Embodiment 1 A power conversion device 100 that converts electric power is mounted on and used in a vehicle such as an electric vehicle or a hybrid vehicle that uses a motor as one of its drive sources. The configuration of this power conversion device 100 will be outlined below with reference to FIG.

[0015] Fig. 1 is a schematic diagram showing the general configuration of the power conversion device 100. Fig. 1 also shows the power conversion device 100 as viewed from the underside of a substrate 50, which is a main component.

[0016] As shown in FIG. 1 , bus bars 40 a, 40 b, 40 c are configured to penetrate through cores 10 a, 10 b, 10 c, which have a notch at the top and a convex shape when viewed from the front, and which constitute current sensors 30 a, 30 b, 30 c (these current sensors will be described in detail below) attached to the substrate 50 (the bus bars and convex cores will also be described in detail below), and are connected to power modules 70 a, 70 b, 70 c, respectively, provided in the power conversion device 100.

[0017] In the above description, the power modules 70a, 70b, and 70c are assumed to be separate, but they may be integrated. Next, the configuration of the main parts of the power conversion device 100 will be described in detail with reference to Figures 2 to 5.

[0018] Fig. 2 is a perspective view showing a main part of the power conversion device 100 according to the first embodiment, and Fig. 3 is a front view showing the main part of the power conversion device 100. Here, Figs. 2 and 3 are views of the entire configuration of the power conversion device 100 with the housing surrounding the power conversion device 100 removed. Fig. 4 is a front view showing a current sensor 30a which is a main part of the power conversion device 100 in Fig. 2, and Fig. 5 is a front view showing a convex-shaped core 10a which is a main part of the current sensor 30a in Fig. 4.

[0019] 2 and 3 , the power conversion device 100 includes three flat bus bars 40a, 40b, and 40c through which three phases of current flow. To measure the current values ​​of the three phases, a current sensor 30a is provided on the bus bar 40a, a current sensor 30b is provided on the bus bar 40b, and a current sensor 30c is provided on the bus bar 40c. The bus bars 40a, 40b, and 40c have the same shape. The current sensors 30a, 30b, and 30c have the same configuration, as described below.

[0020] Furthermore, in addition to the above-described bus bars 40a, 40b, and 40c, the power conversion device 100 also includes convex cores 10a, 10b, and 10c that constitute the current sensors 30a, 30b, and 30c, and magnetoelectric conversion elements 20a, 20b, and 20c mounted on the surface of the substrate 50. Here, each of the cores is a cylindrical body as a whole, has a notch, and a pair of columnar bodies (hereinafter also referred to as a pair of protrusions) are arranged facing outward along the notch.

[0021] The three bus bars 40a, 40b, and 40c are conductors through which three-phase currents (u, v, and w) flow, respectively. These three bus bars are made of, for example, copper or aluminum. However, the materials are not limited to these, and other materials may be used as long as they allow current to flow.

[0022] Furthermore, as shown in Figures 2 and 3, cores 10a, 10b, and 10c, which are formed in a convex shape when viewed from the front of the device, are each made of a magnetic material and include cores 12a, 12b, and 12c which are C-shaped when viewed from the front of the device, and a pair of protrusions 11a, 11b, and 11c (hereinafter also referred to as shield portions) which extend from the ends of this C-shaped core in the direction opposite to the positions where bus bars 40a, 40b, and 40c are installed.

[0023] In addition to the above-mentioned magnetoelectric conversion elements 20a, 20b, and 20c, passive components such as an integrated circuit (IC), resistors, and capacitors, and other necessary electrical components, for example, a circuit for controlling the operation of the power module, are mounted on the substrate 50. The substrate 50 has a function of detecting the current flowing through each of the bus bars 40a, 40b, and 40c by the magnetoelectric conversion elements 20a, 20b, and 20c.

[0024] Furthermore, the magnetoelectric elements 20 a, 20 b, and 20 c also detect external magnetic fields, which are magnetic fields other than those generated by the currents flowing through the bus bars 40 a, 40 b, and 40 c to be measured. The external magnetic fields detected by the magnetoelectric elements 20 a, 20 b, and 20 c result in errors in the current measurement.

[0025] For example, if the measurement target is busbar 40a, the magnetic field generated by the current flowing through adjacent busbars 40b and 40c is considered an external magnetic field. To accurately measure the current, it is important to suppress the influence of the external magnetic field. Therefore, it is desirable to place the magnetically sensitive portion of magnetoelectric conversion element 20a at a predetermined position in gap 13a (hereinafter also referred to as gap portion 13a) formed inside the pair of protrusions 11a. The same applies to gap 13b (hereinafter also referred to as gap portion 13b) and gap 13c (hereinafter also referred to as gap portion 13c).

[0026] Here, the efficiency of magnetic flux collection when the convex core 10a collects the magnetic field generated by the current flowing through the bus bar 40a is inversely proportional to the size of the gap 13a. By reducing the size of the gap 13a, the efficiency of magnetic flux collection generated by the core can be improved, and by locating the protrusion 11a closer to the magnetoelectric conversion element 20a, the influence of external magnetic fields becomes less likely.

[0027] It should be noted that a surface-mounted magnetoelectric conversion element can be used in the power conversion device 100 of the first embodiment. In this case, the magnetoelectric conversion element is surface-mounted on the substrate 50. It should be noted that the manner in which the magnetoelectric conversion element is attached to the substrate 50 is not limited to the surface-mounted type, but by using a surface-mounted magnetoelectric conversion element, the influence of vibrations on the magnetoelectric conversion element can be suppressed, and ultimately, the accuracy of current detection by the power conversion device 100 can be improved.

[0028] In the first embodiment, as shown by the dotted line frames in FIG. 3, a portion of each of the convex cores 10a, 10b, and 10c and the bus bars 40a, 40b, and 40c are integrated with resin 60.

[0029] When the plurality of convex-shaped cores 10 a, 10 b, and 10 c and the plurality of bus bars 40 a, 40 b, and 40 c are integrated by resin molding or the like, the plurality of components can be treated as a single component. In this way, since the plurality of components can be treated as a single component, labor can be saved in the assembly and inspection processes, and the productivity of the power conversion device 100 can be improved.

[0030] In addition, the convex cores 10a, 10b, 10c and the bus bars 40a, 40b, 40c may be combined separately, and then integrated using resin 60 in different combinations (for example, the combination of the convex core 10a and the bus bar 40a).

[0031] 2, the current sensors 30a, 30b, and 30c are arranged side by side at the edge of the substrate 50 (close to the front), but the arrangement of the current sensors 30a, 30b, and 30c is not limited to this. In addition, when the substrate 50 has through holes 51a, 51b, and 51c formed therein, the convex cores 10a and the like can be arranged in the center of the substrate 50 instead of at the edge.

[0032] Therefore, in the power conversion device 100, the degree of freedom in arranging the electrical components and current sensors 30a, 30b, and 30c mounted on the substrate 50 is improved, and the productivity of the power conversion device 100 can be improved.

[0033] As described above, the current sensor 30a is composed of a convex-shaped core 10a and a magnetoelectric transducer 20a, the current sensor 30b is composed of a convex-shaped core 10b and a magnetoelectric transducer 20b, and the current sensor 30c is composed of a convex-shaped core 10c and a magnetoelectric transducer 20c. As described above, in the power conversion device of embodiment 1, the assembly error of each magnetoelectric transducer 20a, 20b, and 20c relative to the gaps 13a, 13b, and 13c can be reduced. Specifically, by fixing a pair of protrusions of the core to a through hole in the substrate, the convex-shaped core and the substrate are configured as an integrated unit, thereby reducing error factors such as dimensional tolerances.

[0034] The convex cores 10a, 10b, and 10c all have the same shape, and a portion of each is attached to the substrate 50. The magnetoelectric conversion elements 20a, 20b, and 20c all have the same shape, and are similarly arranged on the surface of the substrate 50. Therefore, the current sensor 30a will be taken as a representative example, and its configuration will be described in more detail below with reference to Figures 4 and 5, which are front views of the power conversion device.

[0035] <Current Sensor> As shown in FIG. 4, the current sensor 30a is composed of a convex core 10a, a magnetoelectric transducer 20a, and a busbar 40a. As described above, the convex core 10a is formed from a C-shaped core 12a and a protrusion 11a. As shown in FIG. 4, the ends of the C-shaped core 12a and the protrusions 11a are formed in pairs, symmetrically facing each other, forming a gap 13a (gap 13a). The magnetoelectric transducer 20a is disposed on the surface of the substrate 50 within the gap 13a. Since FIGS. 4 and 5 show planar views of the power converter, the core 10a is referred to as the convex core 10a in these figures (the same applies below). While the C-shaped cores 12b and 12c, which are associated with the cores 10b and 10c shown in FIGS. 2 and 3, respectively, have not been described above in relation to FIG. 4, the same applies to the C-shaped core 12a.

[0036] Here, the substrate 50 has two through holes 51 a on the left and right of the magnetoelectric conversion element 20 a, that is, the magnetoelectric conversion element 20 a is disposed on the surface of the substrate 50 between the two through holes 51 a, and converts the detected magnetic field into an electric signal and outputs it. However, in Fig. 4, the magnetoelectric conversion element 20 a is disposed only on one surface of the substrate 50 facing the bus bar 40 a, rather than on both the front and back surfaces of the substrate 50.

[0037] Specifically, when the magnetoelectric conversion element 20a is disposed on one surface of the substrate 50, by disposing the magnetoelectric conversion element 20a on the surface of the substrate 50 closer to the bus bar 40a (the bottom surface in FIG. 4 ), the magnetoelectric conversion element 20a becomes less susceptible to the influence of an external magnetic field. Therefore, the influence of the external magnetic field that causes noise is reduced, and the S / N ratio (signal / noise ratio) can be increased, thereby improving the accuracy of current detection of the power conversion device 100.

[0038] Here, for example, a Hall element or an MR (Magneto Resistive) element is used as the magnetoelectric conversion element 20a. MR elements include an AMR (Anisotropic Magneto Resistive) element, a GMR (Giant Magneto Resistive) element, and a TMR (Tunnel Magneto Resistive) element, but any of these elements may be used. Note that the magnetoelectric conversion element 20a is not limited to these elements, and other elements may be used as long as they have the function of converting a detected magnetic field into an electric signal and outputting it.

[0039] The mounting location of the magnetoelectric conversion element 20a is not limited to one surface of the substrate 50, and it may be mounted on the other surface of the substrate 50. This is because, if the magnetoelectric conversion element 20a is disposed in the gap portion 13a of the convex-shaped core 10a, it is possible to detect the magnetic flux caused by the current flowing through the bus bar 40a.

[0040] On the other hand, as shown in FIG. 5, the convex core 10a is integrally formed from a C-shaped core 12a made of a magnetic material and a protruding portion 11a (also called a shielding portion 11a because it has a shielding function; see the hatched portion in FIG. 5), and a bus bar 40a is installed so as to pass through the convex core 10a.

[0041] In this case, as shown in Fig. 4, a pair of protrusions 11a, which are legs of convex core 10a, are inserted into two through holes 51a located on the left and right sides in Fig. 4, respectively, and are arranged on substrate 50. In other words, convex core 10a, which is a component of current sensor 30a, is provided integrally with substrate 50, and the space is shared by both convex core 10a and substrate 50. Therefore, power conversion device 100 can be made lower in height in the direction perpendicular to the surface of substrate 50 compared to a substrate without through holes 51a.

[0042] Furthermore, since the protrusion 11a, which is the leg of the convex-shaped core 10a, is inserted into the through hole 51, the relative positional relationship between the gap portion 13a and the magnetoelectric conversion element 20a does not change when the magnetoelectric conversion element 20a is displaced vertically due to external forces such as vibration, and the relative positional relationship can be maintained.

[0043] Furthermore, since the shield portion 11a is disposed near the magnetoelectric conversion element 20a, the influence of an external magnetic field on the gap portion 13a can be reduced, which means that the current detection accuracy of the power conversion device 100 can be improved.

[0044] The convex core 10a may be made of, for example, electromagnetic steel sheet, iron, permalloy, or ferrite. These materials may be ferromagnetic materials such as iron, nickel, or cobalt, or materials containing ferromagnetic materials, with soft magnetic materials being particularly suitable. The convex core 10a may be manufactured using either a wound core or laminated layers.

[0045] Here, a magnetic field generated in the gap 13a due to the current flowing through the busbar 40a reaches the magnetoelectric conversion element 20a. The main direction of the magnetoelectric conversion element 20a's magnetic field (magnetic field line vector) is parallel to the surface of the substrate 50 on which the magnetoelectric conversion element 20a is arranged. The magnetoelectric conversion element 20a generates a voltage corresponding to the magnitude of the magnetic field it senses, converts the generated voltage into a current, and outputs an electrical signal corresponding to the magnitude of the measured current to a circuit provided on the substrate 50.

[0046] Here, we will assume that the IC included in the magnetoelectric conversion element 20a is equipped with a converter that converts the magnetic field into a current and converts the magnitude of the magnetic field into a current value, but it is also possible for a separate IC different from the magnetoelectric conversion element 20a to be equipped with the converter, and for this separate IC to be mounted on the substrate 50.

[0047] Second Embodiment A power conversion device 100a according to a second embodiment will be described below with reference to the drawings. Figures 6A and 6B are a plan view (upper side) and a front view (lower side), respectively, showing one current sensor 30a constituting a main part of the power conversion device 100a according to the second embodiment.

[0048] In the power conversion device 100a according to the second embodiment, in addition to the configuration shown in the first embodiment, the shield portion 11a, which is the two legs of the convex core 10a constituting the gap portion 13a, is inserted into two through holes 51a provided in the substrate 50, and adhesive 52 is applied to the boundary portion (gap) between the two legs of the convex core 10a and the through hole 51a.

[0049] 6A, the shield portion 11a, which is the two legs of the convex core 10a, and the two through holes 51a provided in the substrate 50 are fixed with adhesive 52, which reduces the amount of relative displacement between the gap portion 13a and the predetermined position of the magnetoelectric conversion element 20a caused by external forces such as vibration, thereby improving the accuracy of current detection of the power conversion device 100a.

[0050] Third Embodiment A power conversion device 100b according to a third embodiment will be described below with reference to the drawings. Fig. 7 is a front view showing one current sensor 30a which is a main part of the power conversion device 100b according to the third embodiment.

[0051] The power conversion device 100b of this embodiment 3 differs from the configuration of the power conversion devices shown in embodiments 1 and 2 in that one of the two legs of the convex-shaped core 10a is inserted into one through hole 51a provided in the substrate 50 and is arranged on the substrate 50.

[0052] 7 , of the two shield portions 11a of the convex-shaped core 10a, the left-side shield portion (hereinafter also referred to as the left leg) is inserted into the through-hole 51 and disposed on the substrate 50. Even when an external force such as vibration occurs, the left leg of the convex-shaped core 10a and the through-hole 51 can maintain the relative positional relationship between the gap portion 13a and the magneto-electric conversion element 20a. This improves the current detection accuracy of the power conversion device 100 compared to when the current detection accuracy is affected by an external force such as vibration. Furthermore, because the shield portion 11a is disposed near the magneto-electric conversion element 20a, the effect of an external magnetic field on the magneto-electric conversion element 20a due to a change in the position of the gap portion 13a can be reduced.

[0053] Fourth Embodiment A power conversion device 100c according to a fourth embodiment will be described below with reference to the drawings. Fig. 8 is a front view showing one current sensor 30a, which is a main part of the power conversion device 100c according to the fourth embodiment. The power conversion device 100c according to the fourth embodiment differs from the configurations shown in the first and second embodiments in that the magnetoelectric conversion element is arranged on the upper surface of the substrate 50 on the side farther from the bus bar.

[0054] 8, the gap 13a of the convex core 10a is configured to penetrate the substrate 50 on which the magnetoelectric transducer 20b is disposed, so that the magnetoelectric transducer 20b can be disposed on either the upper or lower surface of the substrate 50. When a current is passed through the bus bar 40a, the temperature of the bus bar 40a rises. In this case, the magnetic field detection accuracy of the magnetoelectric transducer 20b changes due to the influence of temperature changes. Therefore, the influence of temperature changes from the bus bar 40a can be reduced by disposing the magnetoelectric transducer 20b on the surface of the substrate 50 farther from the bus bar 40a than by disposing the magnetoelectric transducer 20b on the surface closer to the bus bar 40a.

[0055] If there are electronic components or patterns other than the magnetoelectric conversion element 20b in the gap portion 13a, they will generate a magnetic field, which will act to obstruct the magnetic flux from the bus bar 40a in the magnetic flux collection path including the gap portion 13a, thereby reducing the detection accuracy of the current flowing through the bus bar 40a. Therefore, it is recommended that electronic components other than the magnetoelectric conversion element 20b not be placed in the gap portion 13a as much as possible.

[0056] When the magnetoelectric conversion element 20a is arranged on the surface of the substrate 50 farther from the bus bar 40a, as in the power conversion device 100c of this embodiment 4, the influence of temperature changes from the bus bar 40a can be reduced, thereby improving the detection accuracy of the current flowing through the bus bar 40a.

[0057] Fifth Embodiment A power conversion device 100d according to a fifth embodiment will be described below with reference to the drawings. Fig. 9 is a front view showing one current sensor 30a, which is a main part of the power conversion device 100d according to the fifth embodiment. The power conversion device 100d according to the fifth embodiment differs from the configurations shown in the first and second embodiments in that two magnetoelectric conversion elements 20a, 20b are arranged on both sides of the substrate 50.

[0058] 9, gap portion 13a of convex core 10a is inserted into through-hole 51a of substrate 50, so that magnetoelectric transducers 20a and 20b can be arranged on both surfaces of substrate 50. By arranging magnetoelectric transducer 20a and magnetoelectric transducer 20b on the bottom and top surfaces of substrate 50, respectively, it is possible to provide redundancy to the current detection function of current sensor 30a.

[0059] For example, if the magnetoelectric conversion element 20a arranged on one side of the substrate 50 is the main and the magnetoelectric conversion element 20b arranged on the other side is the sub, during normal operation the value obtained from the magnetoelectric conversion element 20a is acquired as the current detection value. If the magnetoelectric conversion element 20a is shorted to power, shorted to ground, or some other fault occurs, it can be determined whether or not a fault has occurred in the magnetoelectric conversion element 20a by comparing the value with the value of the sub magnetoelectric conversion element 20b arranged on the other side of the substrate 50. Note that with regard to the division of roles between the main and sub magnetoelectric conversion elements, either the magnetoelectric conversion element 20a or 20b may be designated as the main.

[0060] Although various exemplary embodiments and examples are described herein, the various features, aspects, and functions described in one or more embodiments are not limited to specific embodiments and may be applied to the embodiments individually or in various combinations. Therefore, countless variations not illustrated are contemplated within the scope of the technology disclosed herein. For example, this includes modifying, adding, or omitting at least one component, or extracting at least one component and combining it with components of other embodiments. Specifically, the power conversion devices according to the first to fifth embodiments can be mounted and used in various electric vehicles, such as hybrid vehicles or electric vehicles (EVs). In such cases, power conversion devices mounted on electric vehicles have high-speed control to improve output accuracy. However, the higher the control speed, the higher the noise level tends to be. Therefore, the present power conversion device, which can improve current detection accuracy by reducing the influence of external magnetic fields, is particularly useful.

[0061] 10a, 10b, 10c Core, 11a, 11b, 11c Protrusion (shield), 12a, 12b, 12c C-shaped core, 13a, 13b, 13c Gap (gap), 20a, 20b, 20c Magnetoelectric conversion element, 30a, 30b, 30c Current sensor, 40a, 40b, 40c Bus bar, 50 Substrate, 51, 51a, 51b, 51c Through hole, 52 Adhesive, 60 Resin, 70a, 70b, 70c Power module, 100, 100a, 100b, 100c, 100d Power conversion device

Claims

1. a substrate having a through hole; a bus bar connected to the power module and arranged to face the substrate; a core that is a cylindrical body having a notch and surrounding the bus bar, the core having a pair of protrusions formed along the notch; a magnetoelectric conversion element disposed on the substrate and converting a detected magnetic field into an electric signal; Equipped with At least one of the pair of protrusions of the core is inserted into the through hole and fixed to the substrate; the magnetoelectric transducer is disposed in a notched portion of the core or in a gap between a pair of protrusions of the core; A power conversion device characterized by:

2. The power conversion device according to claim 1 , wherein the protrusion and the through hole are fixed with an adhesive.

3. 3. The power converter according to claim 1, wherein the core and the bus bar are integrated with each other using a resin.

4. 3. The power converter according to claim 1, wherein the magnetoelectric transducer is disposed on at least one surface of the substrate facing the bus bar.

5. 3. The power conversion device according to claim 1, wherein the magnetoelectric conversion element is surface-mounted on the substrate.

6. 3. The power conversion device according to claim 1, wherein the substrate has a circuit for controlling the operation of the power module.

7. An electric vehicle comprising the power conversion device according to claim 1 or 2.