Power converters and electric vehicles

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

Technical Field

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

Background Art

[0002] An electric vehicle that uses a motor as a driving source, such as an electric vehicle or a hybrid vehicle, is equipped with a plurality of power conversion devices. The power conversion device is used for driving a motor or regenerating driving energy to a battery. Specific examples of power conversion devices include: a charger that converts power from a commercial AC power source to a DC power source and charges the high-voltage battery; a DC / DC converter that converts power from the DC power source of the high-voltage battery to the voltage of the auxiliary device battery (e.g., 12V); and an inverter that converts DC power from the battery into AC power for the motor.

[0003] Inside the power conversion device, in addition to elements that switch large currents and an arithmetic circuit that controls the power conversion function, a current sensor or the like for measuring the current flowing through a busbar is provided. Since the power conversion device contains many electrical components inside as described above, there has been a problem that the size of the power conversion device increases.

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

[0005] Since the C-shaped core can be formed with a short gap length at the notch, it is possible to enhance the magnetic flux collecting effect on the magnetoelectric conversion element. For this reason, C-shaped cores are often used as magnetic cores constituting current sensors. The magnetoelectric conversion element is connected to a substrate and detects magnetic flux generated in the notch due to the current flowing through the busbar. The core includes a shield part for reducing the influence of an external magnetic field on the magnetoelectric conversion element.

Prior Art Literature

[0006] [Patent Document 1] Patent No. 6372969 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] In the above-mentioned Patent Document 1, the side portion of the C-shaped core is extended opposite to the bottom portion of the C-shaped core, thereby integrally forming the current sensor and the shield portion. This allows for miniaturization of the power conversion device while maintaining the high magnetic field collection effect of the C-shaped core and reducing the influence of external magnetic fields on the magnetoelectric conversion element.

[0008] However, external forces such as vibrations caused the magnetoelectric conversion elements mounted on the substrate to shift from their predetermined positions in the core gap, leading to a decrease in the current detection accuracy of the power converter. Furthermore, as power converters become smaller, the relative distance between electrical components decreases, increasing the influence of external magnetic fields on the core gap. This presented a challenge in reducing the influence of external magnetic fields, requiring larger shielding sections.

[0009] Therefore, the present invention aims to provide a power conversion device that maintains the high magnetic collection effect of the core and miniaturization of the power conversion device while improving 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. [Means for solving the problem]

[0010] The power conversion device disclosed in this application is A substrate having through holes, A busbar connected to the power module and positioned opposite the circuit board, A cylindrical body surrounding the busbar and having a notch, along the notchTo that end, outward on both sides of the notch It has a pair of protrusions formed therein Furthermore, the gap formed by the pair of protrusions is connected to the notch with the same size as the gap. The core and The substrate is arranged and includes a magnetoelectric conversion element that converts the detected magnetic field into an electrical 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 conversion element is positioned in the notched portion of the core, or in the gap between a pair of protrusions of the core. It is characterized by the following: [Effects of the Invention]

[0011] According to the power conversion device disclosed in this application, a protruding portion of a core made of a magnetic material is inserted into one or more through holes provided in a substrate. In addition, the notched portion of the core, or the gap portion of the pair of protrusions, in the part of the substrate near the through hole Magnetoelectric conversion element is distributed Because it is positioned there, it maintains the high magnetic collection effect of the core while also serving as a positioning element relative to the substrate. Therefore, the core Notch portion, or a pair of protrusions By improving the positioning accuracy of the magnetoelectric conversion element relative to the gap, the current detection accuracy can be improved, and the core Notched portion, or External magnetic field applied to the gap of A power conversion device that can reduce the impact can be obtained. [Brief explanation of the drawing]

[0012] [Figure 1] This is a schematic diagram showing the general configuration of the power conversion device according to Embodiment 1. [Figure 2] This is a perspective view showing the main parts of the power conversion device according to Embodiment 1. [Figure 3] This is a front view showing the main parts of the power conversion device according to Embodiment 1. [Figure 4] This is a front view illustrating the current sensor of the power conversion device according to Embodiment 1. [Figure 5] This is a front view illustrating the structure of the current sensor of the power converter according to Embodiment 1. [Figure 6A]It is a plan view showing essential parts of the power converter according to Embodiment 2. [Figure 6B] It is a front view showing essential parts of the power converter according to Embodiment 2. [Figure 7] It is a front view showing essential parts of the power converter according to Embodiment 3. [Figure 8] It is a front view showing essential parts of the power converter according to Embodiment 4. [Figure 9] It is a front view showing essential parts of the power converter according to Embodiment 5. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, a power converter according to an embodiment of the present application will be described with reference to the drawings. In each drawing, the same or corresponding members and portions are denoted by the same reference numerals in the following description.

[0014] Embodiment 1. A power converter (100) that performs power conversion is used by being mounted on a vehicle such as an electric vehicle or a hybrid vehicle that uses a motor as one of driving sources. An outline of the configuration of this power converter 100 will first be described below with reference to FIG. 1.

[0015] FIG. 1 is a schematic diagram showing a schematic configuration of the power converter 100. FIG. 1 is also a view of the power converter 100 as seen from the lower surface side of the substrate 50, which is a main component.

[0016] As shown in FIG. 1, bus bars 40a, 40b, and 40c respectively constitute current sensors 30a, 30b, and 30c attached to the substrate 50 (the current sensors will be described in detail below), and are configured to penetrate through the inner sides of cores 10a, 10b, and 10c each having a notch at an upper portion and a convex shape when viewed from the front (the bus bars and the convex-shaped cores will also be described in detail below), and are respectively connected to power modules 70a, 70b, and 70c included in the power converter 100.

[0017] In the above explanation, power modules 70a, 70b, and 70c were described as separate components, but they may be integrated into a single unit. Therefore, the configuration of the main parts of the power converter 100 will now be explained in detail using Figures 2 to 5.

[0018] Figure 2 is a perspective view showing the main part of the power converter 100 according to Embodiment 1, and Figure 3 is a front view showing the main part of the power converter 100. Here, Figures 2 and 3 show the power converter 100 with the housing surrounding it removed from the overall configuration. Figure 4 is a front view showing the current sensor 30a, which is the main part of the power converter 100 in Figure 2, and Figure 5 is a front view showing the convex-shaped core 10a, which is the main part of the current sensor 30a in Figure 4.

[0019] <Configuration of a power converter> As shown in Figures 2 and 3, the power converter 100 is equipped with three flat busbars 40a, 40b, and 40c through which each phase of the three-phase current flows. To measure the current values ​​of each of the three phases, a current sensor 30a is provided on busbar 40a, a current sensor 30b is provided on busbar 40b, and a current sensor 30c is provided on busbar 40c. The busbars 40a, 40b, and 40c have similar shapes. Furthermore, the current sensors 30a, 30b, and 30c have similar configurations, as described below.

[0020] In addition to the busbars 40a, 40b, and 40c mentioned above, the power converter 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 described above is a cylindrical body as a whole, having a notch, and a pair of columnar bodies (hereinafter also referred to as a pair of protrusions) are arranged facing each other outward along the notch.

[0021] Here, the three busbars 40a, 40b, and 40c are conductors through which the u-phase, v-phase, and w-phase currents of the three-phase system flow, respectively. These three busbars are made of, for example, copper or aluminum. However, the material is not limited to these; any material that conducts current can be used.

[0022] Furthermore, as shown in Figures 2 and 3, the 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 that form a C shape when viewed from the front of the device, and a pair of protrusions 11a, 11b, and 11c (hereinafter also referred to as shielding parts) that extend from the ends of these C-shaped cores in the direction opposite to the positions where the busbars 40a, 40b, and 40c are installed.

[0023] In addition to the magnetoelectric conversion elements 20a, 20b, and 20c described above, the circuit board 50 is also equipped with passive components such as ICs (Integrated Circuits), resistors, and capacitors, as well as other necessary electrical components, such as a circuit for controlling the operation of the power module. The circuit board 50 has a function to detect the current flowing through each of the busbars 40a, 40b, and 40c using the magnetoelectric conversion elements 20a, 20b, and 20c.

[0024] Furthermore, the magnetoelectric conversion elements 20a, 20b, and 20c also detect external magnetic fields, which are magnetic fields other than those generated by the currents flowing through the busbars 40a, 40b, and 40c being measured. These external magnetic fields detected by the magnetoelectric conversion elements 20a, 20b, and 20c become an error in the current measurement.

[0025] For example, if the object to be measured is busbar 40a, the magnetic field generated due to the current flowing through the adjacent busbars 40b and 40c becomes one of the external magnetic fields. To measure the current accurately, it is important to suppress the influence of the external magnetic field. Therefore, it is desirable to place the magnetosensitive portion of the magnetoelectric conversion element 20a at a predetermined position in the 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 magnetization when the convex core 10a collects the magnetic field generated by the current flowing through the busbar 40a is inversely proportional to the size of the gap 13a. By reducing the size of the gap 13a, the efficiency of magnetization generated by the core can be improved, and by positioning the protrusion 11a closer to the magnetoelectric conversion element 20a, it becomes less susceptible to the influence of external magnetic fields.

[0027] In this embodiment 1, the power converter 100 can use a surface-mount type magnetoelectric conversion element. In this case, the magnetoelectric conversion element is surface-mounted on the substrate 50. Although the mounting method of the magnetoelectric conversion element to the substrate 50 is not limited to surface-mount type, using a surface-mount type magnetoelectric conversion element suppresses the effect of vibration on the magnetoelectric conversion element, and consequently improves the accuracy of current detection in the power converter 100.

[0028] Furthermore, in this embodiment 1, as shown enclosed by a dotted line frame in Figure 3, parts of the convex-shaped cores 10a, 10b, and 10c and the busbars 40a, 40b, and 40c are integrated with resin 60.

[0029] When multiple convex-shaped cores 10a, 10b, and 10c and multiple busbars 40a, 40b, and 40c are integrated by resin molding or other means, the multiple parts can be treated as a single part. In this way, multiple parts can be treated as a single part, which reduces the labor required for assembly and inspection processes and improves the productivity of the power converter 100.

[0030] Furthermore, the convex-shaped cores 10a, 10b, and 10c and the busbars 40a, 40b, and 40c may be assembled separately and then integrated with the resin 60 in different combinations (for example, the combination of the convex-shaped core 10a and the busbar 40a).

[0031] Furthermore, in this embodiment 1, as shown in Figure 2, the current sensors 30a, 30b, and 30c are arranged side by side at the edge of the substrate 50 (towards the front), but the arrangement of the current sensors 30a, 30b, and 30c is not limited to this. Also, if through holes 51a, 51b, and 51c are formed in the substrate 50, the convex-shaped core 10a, etc., can be placed in the center of the substrate 50, not just at the edge.

[0032] Therefore, in the power converter 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 converter 100 can be improved.

[0033] In the above, the current sensor 30a is composed of a convex core 10a and a magnetoelectric conversion element 20a, the current sensor 30b is composed of a convex core 10b and a magnetoelectric conversion element 20b, and the current sensor 30c is composed of a convex core 10c and a magnetoelectric conversion element 20c. As described above, in the power conversion device of Embodiment 1, assembly errors of each magnetoelectric conversion element 20a, 20b, and 20c relative to the gap portions 13a, 13b, and 13c can be reduced. Specifically, by fixing the pair of protrusions of the core to the through holes in the substrate, the convex-shaped core and the substrate are configured as a single 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 mounted through the substrate 50. The magnetoelectric conversion elements 20a, 20b, and 20c all have the same shape and are arranged similarly on the surface of the substrate 50. Therefore, in the following section, we will take the current sensor 30a as a representative example and explain its configuration in more detail using Figures 4 and 5, which are front views of the power conversion device.

[0035] <Current Sensor> As shown in Figure 4, the current sensor 30a consists of a convex core 10a, a magnetoelectric conversion element 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 Figure 4, the ends of the C-shaped core 12a and the protrusion 11a are formed in pairs, facing each other symmetrically, thus creating a gap 13a. The magnetoelectric conversion element 20a is positioned on the surface of the substrate 50 within this gap 13a. Note that in Figures 4 and 5, the power conversion device is a planar view, so in these figures, the core 10a is referred to as the convex core 10a (the same applies hereafter). Note that, in relation to Figure 4, the C-shaped cores 12b and 12c, which are related to the cores 10b and 10c shown in Figures 2 and 3 respectively, have not been explained above, but the same applies to these as to the case of the C-shaped core 12a.

[0036] Here, the substrate 50 has two through holes 51a on the left and right sides of the magnetoelectric conversion element 20a; that is, the magnetoelectric conversion element 20a is positioned on the surface of the substrate 50 between the two through holes 51a, and converts the detected magnetic field into an electrical signal for output. However, in Figure 4, the magnetoelectric conversion element 20a is positioned not on both the front and back surfaces of the substrate 50, but only on one surface of the substrate 50 facing the busbar 40a.

[0037] Specifically, when the magnetoelectric conversion element 20a is placed on one side of the substrate 50, by placing the magnetoelectric conversion element 20a on the side of the substrate 50 closer to the busbar 40a (the bottom side in Figure 4), the magnetoelectric conversion element 20a becomes less susceptible to the influence of external magnetic fields. Therefore, the influence of external magnetic fields that act as noise is reduced, and the signal-to-noise ratio (SNR) can be increased, thereby improving the accuracy of current detection in the power converter 100.

[0038] Here, the magnetoelectric conversion element 20a can be, for example, a Hall element or an MR (Magneto Resistive) element. MR elements include AMR (Anisotropic Magneto Resistive), GMR (Giant Magneto Resistive), and TMR (Tunnel Magneto Resistive) elements, and any of these elements is acceptable. Furthermore, the magnetoelectric conversion element 20a is not limited to these elements; any other element that has the function of converting a detected magnetic field into an electrical signal and outputting it is acceptable.

[0039] Furthermore, the mounting location of the magnetoelectric conversion element 20a is not limited to one side of the substrate 50; it may also be mounted on the other side of the substrate 50. This is because if the magnetoelectric conversion element 20a is placed in the gap portion 13a of the convex core 10a, it is possible to detect the magnetic flux caused by the current flowing through the busbar 40a.

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

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

[0042] Furthermore, because the protruding portion 11a, which is the leg portion 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 can be maintained without changing in response to vertical displacement of the magnetoelectric conversion element 20a due to external forces such as vibration.

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

[0044] The material used for the convex-shaped core 10a can be, for example, electrical steel sheet, iron, permalloy, or ferrite. These materials can be ferromagnetic materials such as iron, nickel, or cobalt, or materials containing ferromagnetic materials, with soft magnetic materials being particularly suitable. The convex-shaped core 10a can be manufactured by winding or lamination.

[0045] Here, the 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 magnetization (magnetic field vector) of the magnetoelectric conversion element 20a is parallel to the mounting surface of the substrate 50 on which the magnetoelectric conversion element 20a is placed. The magnetoelectric conversion element 20a then generates a voltage corresponding to the magnitude of the magnetic field it has been exposed to, converts the generated voltage into a current, and outputs an electrical signal corresponding to the measured magnitude of the current to a circuit provided on the substrate 50.

[0046] Here, we assume that the IC in the magnetoelectric conversion element 20a is equipped with a converter that converts the magnetic field into an electric current and converts the magnitude of the magnetic field into a value of the electric current. However, it is also acceptable for a separate IC, different from the magnetoelectric conversion element 20a, to be equipped with the above-mentioned converter, and for this separate IC to be mounted on the substrate 50.

[0047] Embodiment 2. The power converter 100a according to Embodiment 2 will be described below with reference to the figures. Figures 6A and 6B are a plan view (top) and a front view (bottom), respectively, of a current sensor 30a that constitutes a key part of the power converter 100a according to Embodiment 2.

[0048] In addition to the configuration shown in Embodiment 1, the power converter 100a according to this second embodiment has two legs, the shield portions 11a, of the convex core 10a that constitute the gap portion 13a, 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 holes 51a.

[0049] In Figure 6A, the two legs of the convex-shaped core 10a, which are the shield portions 11a, and the two through holes 51a provided in the substrate 50 are fixed by the adhesive 52. This reduces the relative displacement between the gap portion 13a and the predetermined position of the magnetoelectric conversion element 20a due to external forces such as vibration. Therefore, the accuracy of current detection in the power conversion device 100a can be improved.

[0050] Embodiment 3. The power converter 100b according to Embodiment 3 will be described below with reference to the figures. Figure 7 is a front view showing a current sensor 30a, which is a key component of the power converter 100b according to Embodiment 3.

[0051] The power converter 100b according to this third embodiment differs from the power converters shown in the first and second embodiments in that one of the two legs of the convex-shaped core 10a is connected to a single through-hole 5 provided in the substrate 50. 1 It is inserted and placed on the substrate 50.

[0052] Specifically, in Figure 7, of the two shield portions 11a of the convex core 10a, the left shield portion (hereinafter also referred to as the left leg) is inserted into the through hole 51 and positioned on the substrate 50. The left leg of the convex core 10a and the through hole 51 allow the relative positional relationship between the position of the gap portion 13a and the position of the magnetoelectric conversion element 20a to be maintained even when external forces such as vibration occur. Therefore, the accuracy of current detection by the power converter 100 can be improved compared to when external forces such as vibration are present. Furthermore, since the shield portion 11a is positioned near the magnetoelectric conversion element 20a, the influence of external magnetic fields on the magnetoelectric conversion element 20a due to changes in the position of the gap portion 13a can be reduced.

[0053] Embodiment 4. The power converter 100c according to Embodiment 4 will be described below with reference to the figures. Figure 8 is a front view showing a current sensor 30a, which is a key component of the power converter 100c according to Embodiment 4. The power converter 100c according to Embodiment 4 differs from the configurations shown in Embodiments 1 and 2 in that the magnetoelectric conversion element is located on the upper surface of the substrate 50 on the side furthest from the busbar.

[0054] In Figure 8, the convex core 10a Shield section 11aSince the magnetoelectric conversion element 20b is configured to penetrate the substrate 50 on which the magnetoelectric conversion element is placed, the magnetoelectric conversion element 20b can be placed on either the top or bottom surface of the substrate 50. When current is passed through the busbar 40a, the temperature of the busbar 40a rises. In this case, the magnetic field detection accuracy of the magnetoelectric conversion element 20b changes due to the temperature change. Therefore, the effect of temperature changes from the busbar 40a can be reduced more effectively when the magnetoelectric conversion element 20b is placed on the surface of the substrate 50 that is further from the busbar 40a than when it is placed on the surface of the substrate 50 that is closer to the busbar 40a.

[0055] If there are electronic components or patterns other than the magnetoelectric conversion element 20b in the gap 13a, they will generate a magnetic field, which will interfere with the magnetic flux from the busbar 40a in the magnetic collection path including the gap 13a, thus reducing the accuracy of detecting the current flowing through the busbar 40a. Therefore, electronic components other than the magnetoelectric conversion element 20b should be avoided in the gap 13a as much as possible.

[0056] As in the power converter 100c of this embodiment 4, when the magnetoelectric conversion element 20b is placed on the side of the substrate 50 that is farther from the busbar 40a than the magnetoelectric conversion element 20a, the influence of temperature changes from the busbar 40a can be reduced, thereby improving the detection accuracy of the current flowing through the busbar 40a.

[0057] Embodiment 5. The power converter 100d according to Embodiment 5 will be described below with reference to the figures. Figure 9 is a front view showing a current sensor 30a, which is a key component of the power converter 100d according to Embodiment 5. The power converter 100d according to Embodiment 5 differs from the configurations shown in Embodiments 1 and 2 in that two magnetoelectric conversion elements 20a and 20b are arranged on both sides of the substrate 50.

[0058] In Figure 9, the convex core 10a Shield section 11aSince the magnetoelectric conversion elements 20a and 20b are inserted into the through-holes 51a of the substrate 50, they can be placed on both sides of the substrate 50. By placing the magnetoelectric conversion elements 20a and 20b on the bottom and top surfaces of the substrate 50, respectively, redundancy can be provided to the current detection function of the current sensor 30a.

[0059] For example, if a magnetoelectric conversion element 20a located on one side of the substrate 50 is designated as the main element and a magnetoelectric conversion element 20b located on the other side is designated as the sub-element, 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 experiences a fault, ground fault, or other malfunction, it is possible to determine whether or not the magnetoelectric conversion element 20a has malfunctioned by comparing it with the value of the sub-element magnetoelectric conversion element 20b located on the other side of the substrate 50. Note that the division of roles between the main and sub-elements of the magnetoelectric conversion elements described above does not matter; either magnetoelectric conversion element 20a or 20b can be designated as the main element.

[0060] Furthermore, although this application describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but can be applied individually or in various combinations to the embodiments. Accordingly, countless variations not illustrated are conceivable within the scope of the technology disclosed herein. These include, for example, modifications, additions, or omissions of at least one component, as well as the extraction of at least one component and its combination with components of other embodiments. Specifically, the power conversion devices according to embodiments 1 to 5 described above can be installed and used in various electric vehicles, such as hybrid vehicles or electric vehicles (EVs). In this case, power conversion devices installed in electric vehicles have high-speed control to improve output accuracy. However, the higher the control speed, the greater the noise level tends to be. Therefore, this power conversion device, which can improve current detection accuracy by reducing the influence of external magnetic fields, is particularly useful. [Explanation of Symbols]

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

Claims

1. A substrate having through holes, A busbar connected to the power module and positioned opposite the circuit board, A core comprising a cylindrical body surrounding the busbar and having a notch, having a pair of outwardly facing projections formed on both sides of the notch so as to follow the notch, and the gap formed by the pair of projections being the same size as the gap in the notch, The substrate is arranged and includes a magnetoelectric conversion element that converts the detected magnetic field into an electrical 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 conversion element is positioned in the notched portion of the core, or in the gap between a pair of protrusions of the core. A power conversion device characterized by the following features.

2. The power conversion device according to claim 1, characterized in that the protruding portion and the through hole are fixed with an adhesive.

3. The power conversion device according to claim 1 or 2, characterized in that the core and the busbar are integrated with resin.

4. The power conversion device according to claim 1 or 2, characterized in that the magnetoelectric conversion element is arranged on at least one surface of the substrate facing the busbar.

5. The power conversion device according to claim 1 or 2, characterized in that the magnetoelectric conversion element is surface-mounted on the substrate.

6. The power conversion device according to claim 1 or 2, characterized in that the substrate has a circuit for controlling the operation of the power module.

7. An electric vehicle characterized by being equipped with the power conversion device described in claim 1 or 2.

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