POWER CONVERSION DEVICE AND ELECTRIC VEHICLE

Abstract

In a power conversion device (100) are a carrier material (50) with one or more through holes (51a, 51b, 51c), a busbar (40a, 40b, 40c) connected to a power module and facing the carrier material (50), a core (10a, 10b, 10c) surrounding the busbar (40a, 40b, 40c), having a prismatic body with a notched section and comprising a pair of projecting sections (11a, 11b, 11c) formed along the notched section, and a magnetoelectric converter element (20a, 20b, 20c) arranged on the carrier material (50).At least one of the two protruding sections (11a, 11b, 11c) of the core (10a, 10b, 10c) is inserted into one or more through holes (51a, 51b, 51c) and attached to the support material (50), and the magnetoelectric transducer element (20a, 20b, 20c) is arranged either in the notched section of the core (10a, 10b, 10c) or in a free space between the pair of protruding sections (11a, 11b, 11c) of the core (10a, 10b, 10c).

Description

Technical field

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

[0002] A variety of power conversion devices are installed in an electric vehicle, such as an electric car or a hybrid electric car, where a motor is used as the drive source. The power conversion device is used to drive a motor, to feed drive energy back into a battery, or for similar purposes. Specific examples of power conversion devices include a charger that converts commercial alternating current (AC) to direct current (DC) and charges a high-voltage battery with the DC; a DC / DC converter that converts the DC from the high-voltage battery to a voltage (e.g., 12 V) for an auxiliary battery; an inverter that converts the DC from a battery to AC for a motor; and other similar devices.

[0003] In addition to a switching element for a large current and a computing circuit for controlling a current conversion function, the power conversion device includes a current sensor for measuring the current flowing through a busbar or similar component. Because the power conversion device contains many internal electrical components, its size increases.

[0004] To suppress an increase in the size of the power conversion device, a configuration is disclosed in which the current sensor is integrally formed with other components (see, for example, patent document 1). The current sensor consists of a current rail, a C-shaped core made of a magnetic material, and a magnetoelectric transducer element, wherein the current rail is arranged inside the C-shaped core and the magnetoelectric transducer element is provided in a gap region of the C-shaped core.

[0005] Since the aforementioned C-shaped core can be designed with a shorter gap length in the notch region, the effect of the magnetic field concentration on the magnetoelectric transducer element can be amplified. Therefore, the C-shaped core is frequently used as the magnetic core that forms the current sensor. The magnetoelectric transducer element is connected to a substrate material and detects the magnetic flux generated in the notch region by a current flowing through the busbar. The core includes a shielding section to reduce the influence of external magnetic fields on the magnetoelectric transducer element. State of the art patent specification

[0006] Patent specification 1: Japanese patent no. 6372969 Summary of the invention; Problem statement of the invention

[0007] In the aforementioned patent specification 1, the side surface sections of the C-shaped core are extended so that the extended sections face the bottom section of the C-shaped core, and the current sensor and the shielding sections are formed in one piece, making it possible to reduce the influence of external magnetic fields on the magnetoelectric transducer element while maintaining the effect of the high magnetic field concentration through the C-shaped core and reducing the size of the power conversion device.

[0008] However, the current sensing accuracy of the power conversion device is reduced due to a displacement of the magnetoelectric converter element mounted on the substrate from a predetermined position in the core's gap area by an external force, such as vibration. Furthermore, as the power conversion device is miniaturized, the relative distance between the electrical components decreases, and the influence of external magnetic fields on the core's gap area increases. This necessitates an enlarged shielding area to reduce the influence of the external magnetic field.

[0009] Therefore, an objective of the present application is to obtain a power conversion device that can improve the positioning accuracy of a magnetoelectric converter element with respect to a gap section of a core in order to improve current sensing accuracy, and that can reduce the influence of external magnetic fields on the gap section of the core, while maintaining the effect of a high magnetic field concentration through the core and miniaturizing the power conversion device. Means of solving the problem

[0010] A power conversion device disclosed in the present application comprises a carrier material with one or more through-holes, a busbar connected to a power module and facing the carrier material, a core surrounding the busbar with a prismatic body having a notched region and a pair of projections formed along the notch region, and a magnetoelectric transducer element arranged on the carrier material, the latter being designed to convert a detected magnetic field into an electrical signal. At least one of the two protruding sections of the core is inserted into the one or more through-holes and fastened to the carrier material, and the magnetoelectric transducer element is arranged either in the notched section of the core or in a space between the two protruding sections of the core. Advantageous effect of the invention

[0011] According to the energy conversion device disclosed in the present application, the aforementioned sections of the core, which consists of a magnetic material, are inserted into one or more through-holes provided in the support material, and the magnetoelectric converter element is arranged in a section of the support material near the through-holes. Therefore, the core also serves as a positioning element with respect to the support material while maintaining a high magnetic field concentration. Thus, it is possible to obtain a power conversion device that can improve the positioning accuracy of the magnetoelectric converter element with respect to the gap section of the core, thereby improving current sensing accuracy and reducing the influence of external magnetic fields on the gap section of the core. Brief description of the drawings Fig. Figure 1 is a schematic diagram showing a schematic configuration of a power conversion device according to embodiment 1. Fig. Figure 2 is a perspective view showing a main part of the power conversion device according to embodiment 1. Fig. Figure 3 is a front view showing the main part of the power conversion device according to embodiment 1. Fig. Figure 4 is a front view illustrating a current sensor of the power conversion device according to embodiment 1. Fig. Figure 5 is the front view to describe a structure of the current sensor of the power conversion device according to embodiment 1. Fig. Figure 6A is a top view showing a main part of a power conversion device according to embodiment 2. Fig. Figure 6B is a front view showing the main part of the power conversion device according to embodiment 2. Fig. Figure 7 is a front view showing a main part of a power conversion device according to embodiment 3. Fig. Figure 8 is a front view showing a main part of a power conversion device according to embodiment 4. Fig. Figure 9 is a front view showing a main part of a power conversion device according to embodiment 5. embodiment of the invention

[0012] The following describes power conversion devices according to embodiments of the present application with reference to the drawings. Furthermore, identical or corresponding elements and parts in each of the drawings are identified by the same reference numerals. Design 1

[0013] A power conversion device 100, which performs a current conversion, is used by installing it in a vehicle such as an electric vehicle or a hybrid electric vehicle that includes a motor as one of the drive sources. The design of the power conversion device 100 is first described with reference to Fig. 1 described.

[0014] Fig. Figure 1 is a schematic diagram showing the structure of the power conversion device 100. Fig. Figure 1 is also a view of the power conversion device 100, seen from the underside of a carrier material 50, which is a main component.

[0015] As in Fig. As shown in Figure 1, the busbars 40a, 40b and 40c are each configured to penetrate the interior of the cores 10a, 10b and 10c, each of which has a notched section in the upper area and, viewed from the front, each has a podium shape, each forming current sensors 30a, 30b and 30c (current sensors are described in detail below) and each connected to power modules 70a, 70b and 70c contained in the power conversion device 100.

[0016] It should be noted that although the power modules 70a, 70b, and 70c are described above as separate, they can be integrated together. Next, a configuration of the main parts of the power conversion device 100 is given with reference to Fig. 2 to Fig. 5 described in detail.

[0017] Fig. Figure 2 is a perspective view showing the main parts of the power conversion device 100 according to embodiment 1, and Fig. Figure 3 is a front view showing the main parts of the power conversion device 100. Here are Fig. 2 and Fig. Three diagrams showing the housing surrounding the power conversion device 100 removed from the overall configuration of the power conversion device 100. Furthermore, Fig. 4 a front view showing the current sensor 30a, which is a main part of the power conversion device 100 Fig. 2 is, and Fig. Figure 5 is a front view showing the podium-shaped core 10a, which forms a main part of the current sensor 30a. Fig. 4 is. < Configuration of the power conversion device >

[0018] The power conversion device 100 comprises three flat, plate-shaped busbars 40a, 40b and 40c, through which three-phase electrical currents flow, each in its respective busbar, as shown in Fig. 2 and Fig. Figure 3 shows that, to measure the respective current values ​​of the three phase currents, current sensor 40a is installed in busbar 30a, current sensor 40b in busbar 30b, and current sensor 40c in busbar 30c. It should be noted that busbars 40a, 40b, and 40c have the same shape and that current sensors 30a, 30b, and 30c have the same configuration as described below.

[0019] In addition to the busbars 40a, 40b, and 40c described above, the power conversion device 100 comprises podium-shaped cores 10a, 10b, and 10c, which form the current sensors 30a, 30b, and 30c, as well as magnetoelectric converter elements 20a, 20b, and 20c, which are mounted on the surface of the support material 50. Here, each of the cores is a prismatic body and has the notch region, and a pair of column-shaped bodies (hereinafter also referred to as the pair of projecting regions) are arranged outward along the notch region such that they are opposite each other.

[0020] The three busbars 40a, 40b, and 40c are conductors through which currents from three phases—a u-phase, a v-phase, and a w-phase—flow. These three busbars are made of materials such as copper or aluminum. However, the material is not limited to these, and other materials can be used as long as a current flows through them.

[0021] As in Fig. 2 and Fig. As shown in Figure 3, the cores 10a, 10b and 10c, which form a podium shape when viewed from the front of the device, are made of a magnetic material and each comprise the cores 12a, 12b and 12c, which are C-shaped when viewed from the front of the device, as well as a pair of protruding sections 11a, 11b and 11c (hereinafter also referred to as shielding sections) in which end sections of the C-shaped core are extended in a direction opposite to the positions where the busbars 40a, 40b and 40c are installed.

[0022] It should be noted that, in addition to the magnetoelectric transducer elements 20a, 20b, and 20c described above, passive components such as an integrated circuit (IC), a resistor, and a capacitor, as well as another necessary electrical component, for example, a circuit that controls the operation of the power modules, are mounted on the substrate 50. The substrate 50 serves to detect the respective currents flowing through the busbars 40a, 40b, and 40c via the magnetoelectric transducer elements 20a, 20b, and 20c.

[0023] The magnetoelectric transducer elements 20a, 20b, and 20c also detect external magnetic fields, i.e., magnetic fields not generated by the currents being measured through the busbars 40a, 40b, and 40c. These external magnetic fields detected by the magnetoelectric transducer elements 20a, 20b, and 20c cause an error in the current measurement.

[0024] If, for example, the quantity to be measured is the current rail 40a, the magnetic field generated by the current flowing through the adjacent current rails 40b and 40c is one of the external magnetic fields. To measure the current with high accuracy, it is important to suppress the influence of the external magnetic fields. Therefore, it is desirable to arrange a magnetically sensitive section of the magnetoelectric transducer element 20a at a predetermined position in a gap 13a (hereinafter also referred to as gap section 13a) formed within the pair of the preceding sections 11a. Note that the same applies to gap 13b (hereinafter also referred to as gap region 13b) and gap 13c (hereinafter also referred to as gap region 13c).

[0025] When the podium-shaped core 10a concentrates the magnetic field generated by the current flowing through the busbar 40a, the efficiency of the magnetic field concentration is inversely proportional to the size of the gap in the gap section 13a. By reducing the size of the gap section 13a, the efficiency of the magnetic field concentration occurring at the core can be improved, and by arranging the foreground sections 11a closer to the magnetoelectric transducer element 20a, the influence of external magnetic fields can be minimized.

[0026] A surface-mounted magnetoelectric transducer element can be used in the power conversion device 100 of embodiment 1. In this case, the magnetoelectric transducer elements are surface-mounted on the substrate 50. It should be noted that the mounting method for the magnetoelectric transducer elements on the substrate 50 is not limited to the surface-mounted type, but the use of surface-mounted magnetoelectric transducer elements suppresses the influence of vibrations on the magnetoelectric transducer elements, thereby improving the accuracy of the current sensing of the power conversion device 100.

[0027] Furthermore, in embodiment 1, as in Fig. Figure 3 shows within a dotted frame, parts of the podium-shaped cores 10a, 10b and 10c and the busbars 40a, 40b and 40c integrated by a resin 60.

[0028] If the multiple cores 10a, 10b, and 10c are integrated in a podium form and the multiple busbars 40a, 40b, and 40c are integrated by resin molding or similar processes, several components can be treated as a single component. This allows the multiple components to be treated as a single component, thereby saving labor in the assembly and inspection processes and improving the productivity of the power conversion device 100.

[0029] It should be noted that the podium-shaped cores 10a, 10b and 10c and the busbars 40a, 40b and 40c can be combined separately and integrated with separate combinations through the resin 60 (e.g. integration through a combination of the podium-shaped core 10a and the busbar 40a).

[0030] In embodiment 1, as in Fig. As shown in Figure 2, the current sensors 30a, 30b, and 30c are arranged along the edge of the support material 50 (arrangement shifted towards the front), but the arrangement of the current sensors 30a, 30b, and 30c is not limited to this. If through-holes 51a, 51b, and 51c are formed in the support material 50, the podium-shaped core 10a and the other elements can be arranged in the center of the support material 50 instead of at the edge.

[0031] Therefore, in the power conversion device 100, the flexibility of the arrangement of the electrical components and the current sensors 30a, 30b and 30c mounted on the carrier material 50 is improved, and the manufacturability of the power conversion device 100 can be improved.

[0032] In the above, the current sensor 30a consists of the podium-shaped core 10a and the magnetoelectric transducer element 20a, the current sensor 30b of the podium-shaped core 10b and the magnetoelectric transducer element 20b, and the current sensor 30c of the podium-shaped core 10c and the magnetoelectric transducer element 20c. As described above, in the power conversion device of embodiment 1, the assembly errors of the respective magnetoelectric transducer elements 20a, 20b, and 20c with respect to the corresponding gap sections 13a, 13b, and 13c can be reduced. Since, in particular, the pair of protruding sections of the core described above is attached to the through-holes of the support material, the podium-shaped core and the support material are integrally formed, which reduces error factors such as dimensional tolerances.

[0033] It should be noted that the podium-shaped cores 10a, 10b, and 10c all have the same shape and are each positioned such that a portion of the core penetrates the support material 50. Furthermore, the magnetoelectric transducer elements 20a, 20b, and 20c all have the same shape and are arranged in the same way on the surface of the support material 50. Therefore, the current sensor 30a is used below as a representative example, and its configuration is described with reference to Fig. 4 and Fig. 5, the front views of the power conversion device described in more detail. <stromsensor>

[0034] As in Fig. As shown in Figure 4, the current sensor 30a comprises the podium-shaped core 10a, the magnetoelectric transducer element 20a, and the busbar 40a. As described above, the podium-shaped core 10a consists of the C-shaped core 12a and the preceding sections 11a, and as shown in Figure 4. Fig. As shown in Figure 4, the end sections of the C-shaped core 12a and the projecting sections 11a are formed in pairs such that they are bilaterally symmetrical to each other, thereby forming the gap 13a (gap section 13a). The magnetoelectric transducer element 20a is arranged on the surface of the support material 50 in the gap section 13a. It should be noted that in Fig. 4 and Fig. 5 the power converter device is shown in a top view and therefore in these figures the core 10a is referred to as podium-shaped core 10a (the same applies below). In the foregoing, the C-shaped cores 12b and 12c, which each relate to the in Fig. 2 and Fig. The 3 shown cores 10b and 10c refer to, in relation to Fig. 4 not described, but these are also similar to the case of the C-shaped core 12a.

[0035] Since the carrier material 50 has two through holes 51a to the left and right of the magnetoelectric transducer element 20a, the magnetoelectric transducer element 20a is arranged on the surface of the carrier material 50 between the two through holes 51a and converts the detected magnetic field into an electrical signal and outputs the electrical signal. It should be noted that in Fig. 4 the magnetoelectric transducer element 20a is not arranged on the front and back of the carrier material 50, but only on one of the sides of the carrier material 50 that faces the busbar 40a.

[0036] When the magnetoelectric transducer element 20a is arranged on a surface of the support material 50, the magnetoelectric transducer element 20a is less affected by the external magnetic fields by the magnetoelectric transducer element 40a on the surface (in Fig. 4 the underside) of the carrier material 50 is positioned closer to the busbar 20a. This reduces the influence of external magnetic fields that cause noise and increases the signal-to-noise ratio (SN ratio), thus improving the accuracy of the current sensing of the power conversion device 100.

[0037] Here, for example, a Hall element or a magnetoresistive (MR) element is used as the magnetoelectric transducer element 20a. Examples of the MR element are an anisotropic magnetoresistive (AMR) element, a gigantic magnetoresistive (GMR) element, and a tunnel magnetoresistive (TMR) element, and any of these elements can be used. It should be noted that the magnetoelectric transducer element 20a is not limited to these elements, but can also be other elements, as long as the elements have the function of converting a detected magnetic field into an electrical signal and outputting the electrical signal.

[0038] The installation location of the magnetoelectric transducer element 20a is not limited to one surface of the support material 50, and the magnetoelectric transducer element can also be mounted on the other surface of the support material 50. This is because, if the magnetoelectric transducer element 20a is arranged on the gap section 13a of the podium-shaped core 10a, the magnetic flux caused by the current flowing through the busbar 40a can be detected.

[0039] On the other hand, as in Fig. As shown in Figure 5, the podium-shaped core 10a described above is formed in one piece from the C-shaped core 12a and the protruding sections 11a (which are also referred to as shielding sections 11a, since they have the shielding function and extend to the hatched section in Figure 5). Fig. 5 refer) formed, which consist of a magnetic material, and the busbar 40a is installed so that it penetrates the podium-shaped core 10a.

[0040] In this case, as in Fig. Figure 4 shows a pair of projecting sections 10a, which are the leg sections of the podium-shaped core 11a, inserted into two through holes 51a, which are located in Fig. 4 are located on the left and right, and are arranged on the support material 50. That is, the podium-shaped core 10a, which is a component of the current sensor 30a, is integrally provided with the support material 50, and the space is shared by both the podium-shaped core 10a and the support material 50, so that the height of the energy conversion device 100 in the direction perpendicular to the surface of the support material 50 can be reduced compared to a support material without the through holes 51a.

[0041] Since the foregoing sections 11a, which are the leg sections of the podium-shaped core 10a, are inserted into the through holes 51, the relative positional relationship between the gap section 13a and the magnetoelectric transducer element 20a is not changed even if the magnetoelectric transducer element 20a is displaced in a vertical direction due to an external force, such as a vibration, and the relative positional relationship can be maintained.

[0042] Since the shielding sections 11a are arranged near the magnetoelectric transducer element 20a, the influence of external magnetic fields on the gap section 13a can also be reduced. This means that the current sensing accuracy of the current conversion device 100 can be improved.

[0043] It should be noted that materials such as electromagnetic steel sheet, steel, Permalloy, or ferrite are used for the podium-shaped core 10a. These materials should be ferromagnetic materials such as iron, nickel, and cobalt, or materials containing ferromagnetic components, with soft magnetic materials being particularly suitable. The process for manufacturing the podium-shaped core 10a can be either that of a wound core or a laminated core.

[0044] Here, the magnetic field generated at the gap section 13a by the current flowing through the busbar 40a reaches the magnetoelectric transducer element 20a. The main direction of the magnetic sensitivity (magnetic field vector) of the magnetoelectric transducer element 20a is parallel to the mounting surface of the support material 50 on which the magnetoelectric transducer element 20a is arranged. The magnetoelectric transducer element 20a generates a voltage corresponding to the magnitude of the detected magnetic field, 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 support material 50.

[0045] Although it is described that an IC contained in the magnetoelectric transducer element 20a contains a transducer that converts the magnetic field into a current in order to convert the magnitude of the magnetic field into the value of the current, an IC different from the magnetoelectric transducer element 20a may contain the transducer, and the different IC may be mounted on the substrate material 50. Design 2

[0046] A power conversion device 100a according to embodiment 2 is described below with reference to the drawings. Fig. 6A and Fig. Figure 6B shows a top view (top) and a front view (bottom) showing a current sensor 30a, which forms a main part of a power conversion device 100a according to embodiment 2.

[0047] In the power conversion device 100a according to embodiment 2, in addition to the configuration shown in embodiment 1, the shielding sections 11a, which are two leg sections of the podium-shaped core 10a forming the gap section 13a, are inserted into two through holes 51a provided in the carrier material 50, and an adhesive 52 is applied to (gaps) of boundary sections between the two leg sections of the podium-shaped core 10a and the through holes 51a.

[0048] In Fig. 6A The shielding sections 11a, which form the two leg sections of the podium-shaped core 10a, and the two through-holes 51a provided in the carrier material 50 are fixed by the adhesive 52, thereby reducing the relative displacement between the gap sections 13a and the predetermined position of the magnetoelectric transducer element 20a due to an external force, such as vibration. Therefore, the accuracy of the current sensing of the power conversion device 100a can be improved. Design 3.

[0049] A power conversion device 100b according to embodiment 3 is described below with reference to the drawings. Fig. Figure 7 is a front view showing a current sensor 30a, which is a main part of a power conversion device 100b according to embodiment 3.

[0050] The power conversion device 100b according to embodiment 3 has a different configuration than the configurations of the power conversion devices shown in embodiment 1 and embodiment 2 and has the configuration in which one of the two leg sections of the podium-shaped core 10a is inserted into a through hole 51a provided in the support material 50 and is arranged on the support material 50.

[0051] In particular, in Fig. 7. Of the two shielding sections 11a of the podium-shaped core 10a, the left-hand shielding section (hereinafter also referred to as the left leg section) is inserted into the through-hole 51 and positioned on the support material 50. Even if an external force such as vibration occurs, the left leg section of the podium-shaped core 10a and the through-hole 51 can maintain the relative positional relationship between the position of the gap section 13a and the position of the magnetoelectric transducer element 20a with respect to the external force such as vibration, and thus the accuracy of the current sensing of the power conversion device 100 can be improved compared to the case in which the influence of an external force such as vibration is present.Since the shielding sections 11a are arranged near the magnetoelectric transducer element 20a, the influence of external magnetic fields on the magnetoelectric transducer element 20a can be reduced due to the change in position of the gap section 13a. Design 4

[0052] A power conversion device 100c according to embodiment 4 is described below with reference to the drawings. Fig. Figure 8 is a front view showing a current sensor 30a, which is a key part of a power conversion device 100c according to embodiment 4. The power conversion device 100c according to embodiment 4 has a different configuration than the configurations shown in embodiment 1 and embodiment 2, since the magnetoelectric converter element is located on the top side of the support material 50 on the side furthest from the busbar.

[0053] In Fig. In section 8, the gap section 13a of the podium-shaped core 10a is configured to penetrate the support material 50 on which the magnetoelectric transducer element is arranged, so that the magnetoelectric transducer element 20b can be arranged either on the top or the bottom of the support material 50. When a current is applied to the busbar 40a, the temperature of the busbar 40a rises.In this case, the influence of the temperature change on the magnetic field measurement accuracy of the magnetoelectric transducer element 20b can be reduced, and the influence of the temperature change due to the busbar 40a can be reduced more in the case where the magnetoelectric transducer element is arranged on the surface of the support material 50 on the side further away from the busbar 40a than in the case where the magnetoelectric transducer element is arranged on the surface of the support material 50 on the side closer to the busbar 40a.

[0054] If electronic components or patterns other than the magnetoelectric transducer element 20b are present in the gap area 13a, they generate magnetic fields and thus prevent the magnetic flux from the busbar 40a in the magnetic field concentration path encompassing the gap area 13a, thereby reducing the detection accuracy of the current flowing through the busbar 40a. Therefore, electronic components that do not belong to the magnetoelectric transducer element 20b are, if possible, not arranged in the gap area 13a.

[0055] If the magnetoelectric transducer element 20a, as in the power conversion device 100c of embodiment 4, is arranged as magnetoelectric transducer element 20b on the surface of the support material 50 on the side furthest from the busbar 40a, the influence of the temperature change from the busbar 40a can be reduced, thereby improving the detection accuracy of the current flowing through the busbar 40a. Design 5

[0056] A power conversion device 100d according to embodiment 5 is described below with reference to the drawings. Fig. Figure 9 is a front view showing a current sensor 30a, which is a key part of a power conversion device 100d according to embodiment 5. The power conversion device 100d according to embodiment 5 has a different configuration than the configurations shown in embodiment 1 and embodiment 2, since two magnetoelectric converter elements 20a and 20b are arranged on both surfaces of the support material 50.

[0057] In Fig. In section 9, the slot section 13a of the podium-shaped core 10a is inserted into the through holes 51a of the support material 50, so that the magnetoelectric transducer elements 20a and 20b can be arranged on both surfaces of the support material 50. By arranging the magnetoelectric transducer element 20a and the magnetoelectric transducer element 20b on the underside and the topside of the support material 50, respectively, the current sensing function of the current sensor 30a can be made redundant.

[0058] For example, if the magnetoelectric transducer element 20a arranged on one surface of the support material 50 is a primary element and the magnetoelectric transducer element 20b arranged on the other surface is a secondary element, a value obtained from the magnetoelectric transducer element 20a is recorded as a current sensing value during normal operation. If the magnetoelectric transducer element 20a is short-circuited to the power supply or ground, or has another fault, a comparison with the value of the secondary magnetoelectric transducer element 20b, which is arranged on the other surface of the support material 50, can determine whether a fault has occurred in the magnetoelectric transducer element 20a.It should be noted that, due to the division of tasks described above between the main and the sub-magnetoelectric transducer element, either the magnetoelectric transducer element 20a or 20b can be referred to as the main element.

[0059] Although various exemplary embodiments and examples are described in the present application, several features, aspects, and functions described in one or more embodiments are not inherent in any application of the content disclosed in a particular embodiment and may be applicable to any embodiment, either alone or in various combinations. Accordingly, countless variations not shown are conceivable within the scope of the prior art disclosed in the description of the present application. These include, for example, the case in which at least one component is modified, added, or omitted, and the case in which at least one component is extracted and combined with a component disclosed in another embodiment.In particular, the power conversion devices according to embodiments 1 to 5 can be installed and used in various electric vehicles, for example, a hybrid electric vehicle or a battery electric vehicle (generally referred to as an EV). In this case, the speed of the control system in the power conversion devices installed in the electric vehicles is increased to improve output accuracy. However, the faster the control system, the higher the noise level tends to be. Therefore, the present power conversion device, which can improve current sensing accuracy by reducing the influence of external magnetic fields, is particularly useful. Description of reference signs and symbols 10a, 10b, 10c core, 11a, 11b, 11c protruding part (shielding part), 12a, 12b, 12c C-shaped core, 13a, 13b, 13c Gap section (air gap), 20a, 20b, 20c magnetoelectric transducer element, 30a, 30b, 30c current sensor, 40a, 40b, 40c busbar, 50 carrier material, 51, 51a, 51b, 51c Through hole, 52 adhesives, 60 Harz, 70a, 70b, 70c power module, 100, 100a, 100b, 100c, 100d Power conversion device QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 6372969

[0006] < / stromsensor>

Claims

[1] A power conversion device comprising: a carrier material with one or more through holes; a busbar connected to a power module and arranged so that it faces the substrate material; a core surrounding the busbar, comprising a prismatic body with a notched section and a pair of projecting sections formed along the notched section; and a magnetoelectric transducer element that is arranged on the substrate material and configured to convert a detected magnetic field into an electrical signal, wherein at least one of the two preceding sections of the core is inserted into the one or more through holes and attached to the carrier material, and The magnetoelectric transducer element is arranged either in the notch section of the core or in a free space between the two protruding sections of the core. [2] Power conversion device according to claim 1, wherein the foreground sections and the one or more through holes are attached to one another with an adhesive. [3] Power conversion device according to claim 1 or 2, wherein the core and the busbar are integrated with resin. [4] Power conversion device according to claim 1 or 2, wherein the magnetoelectric converter element is arranged on at least one surface of the carrier material which faces the busbar. [5] Power conversion device according to claim 1 or 2, wherein the magnetoelectric converter element is surface-mounted on the substrate material. [6] Power conversion device according to any one of claims 1 to 5, wherein the carrier material comprises a circuit that controls the operation of the power module. [7] An electric vehicle comprising the power conversion device according to any one of claims 1 to 6.

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