CN113644830A

CN113644830A - Power conversion device

Info

Publication number: CN113644830A
Application number: CN202110400172.8A
Authority: CN
Inventors: 富士冈一洋; 中田宗树
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2020-04-23
Filing date: 2021-04-14
Publication date: 2021-11-12
Also published as: JP2021175248A; JP6914395B1

Abstract

The invention provides a power conversion device which can maintain high magnetism gathering effect of a C-shaped core body and miniaturization of the power conversion device and can restrain strength reduction of a substrate on which the C-shaped core body is arranged. The method comprises the following steps: a bus bar; a U-shaped core body which is composed of a magnetic body and in which a bus bar is arranged; a substrate having two through holes into each of which each of the two legs of the U-shaped core is inserted; two magnetic bodies arranged on one through hole side and the other through hole side at a distance from each other in the substrate portion between the through holes; and a magnetoelectric conversion element which is disposed on the substrate between the two through holes and converts a detected magnetic field into an electric signal to output the electric signal, wherein the C-shaped core is formed of a U-shaped core and two magnetic bodies.

Description

Power conversion device

Technical Field

The present application relates to a power conversion apparatus.

Background

A plurality of power conversion devices are mounted on an electric vehicle using an electric motor as a drive source, such as an electric vehicle or a hybrid vehicle. The power conversion device is used for driving a motor or regenerating driving energy to a battery or the like. Specific examples of the power conversion device include: a charger for converting a commercial alternating current power supply into a direct current power supply and charging a high voltage battery; a DC/DC converter for converting a direct current power source of the high voltage battery into a voltage (e.g., 12V) of a battery for auxiliary equipment; and an inverter for converting direct current from the battery into alternating current to the motor, and the like. The power converter is provided with, in addition to an element for switching a large current and an arithmetic circuit for controlling a power conversion function, a current sensor for measuring a current flowing through the bus, and the like. As described above, since the power converter includes a plurality of electronic components and the like inside, there is a problem that the size of the entire power converter becomes large.

A structure in which a current sensor is integrally formed with another component in order to suppress an increase in size of a power conversion device is disclosed (for example, see patent document 1). The current sensor includes a bus bar, a C-shaped core made of a magnetic material having a notch portion and a bus bar arranged inside, and a magneto-electric conversion element provided in the notch portion of the C-shaped core. The C-shaped core can be formed with a short gap length in the cutout, and therefore can improve the magnetic flux concentration effect on the magnetoelectric conversion element. Therefore, a C-shaped core is often used for a magnetic core constituting the current sensor. The magneto-electric conversion element is connected to the substrate, and detects magnetic flux generated in the cutout portion by a current flowing through the bus bar. The substrate includes a pair of through holes through which a part of the C-shaped core is inserted, and a notch is disposed on the side where the magnetoelectric conversion element is provided.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2005-172716

Disclosure of Invention

Technical problem to be solved by the invention

In patent document 1, since the current sensor and the substrate are integrally formed by providing the substrate with the pair of through holes and penetrating a part of the C-shaped core, the power conversion device can be miniaturized while maintaining the high magnetism collecting effect of the C-shaped core. However, in order to cause a part of the C-shaped core to penetrate a pair of through holes provided in the substrate, the through holes provided in the substrate become large, which causes a problem of lowering the strength of the substrate. In addition, when the strength of the substrate is reduced, there is a problem that the substrate is broken by an external force such as vibration.

Therefore, an object of the present invention is to obtain a power conversion device capable of suppressing a decrease in strength of a substrate on which a C-shaped core is disposed while maintaining a high magnetic flux concentration effect of the C-shaped core and a reduction in size of the power conversion device.

Technical scheme for solving technical problem

The power conversion device disclosed in the present application includes: a plate-shaped bus bar; a U-shaped core body which is composed of a magnetic body and in which a bus bar is arranged; a substrate having two through holes into each of which each of the two legs of the U-shaped core is inserted; two magnetic bodies arranged on one through hole side and the other through hole side at a distance from each other in the substrate portion between the two through holes; and a magnetoelectric conversion element which is disposed on the substrate portion between the two through holes, converts the detected magnetic field into an electric signal, and outputs the electric signal, wherein the C-shaped core is formed of a U-shaped core and two magnetic bodies.

Effects of the invention

According to the power conversion device disclosed in the present application, each of the two legs of the U-shaped core made of the magnetic material is inserted into each of the two through holes provided in the substrate, the two magnetic materials are arranged on the one through hole side and the other through hole side at intervals between the substrate portions of the two through holes, respectively, and the C-shaped core is formed of the U-shaped core and the two magnetic materials, so that it is possible to maintain the high magnetism collecting effect of the C-shaped core and the downsizing of the power conversion device, and to suppress a decrease in strength of the substrate on which the C-shaped core is arranged.

Drawings

Fig. 1 is a perspective view showing a schematic configuration of a power conversion device according to embodiment 1.

Fig. 2 is a front view showing a power conversion device according to embodiment 1.

Fig. 3 is a perspective view showing a main part of the power conversion device according to embodiment 1.

Fig. 4 is a schematic diagram showing a schematic configuration of a power conversion device according to embodiment 1.

Fig. 5 is a perspective view showing a main part of a power conversion device according to embodiment 2.

Fig. 6 is a perspective view showing a main part of a power conversion device according to embodiment 3.

Fig. 7 is a perspective view showing a main part of a power conversion device according to embodiment 4.

Fig. 8 is a perspective view showing a magnetic body of the power conversion device according to embodiment 4.

Fig. 9 is a perspective view showing a main part of a power conversion device according to embodiment 5.

Detailed Description

Hereinafter, a power conversion device according to an embodiment of the present application will be described with reference to the drawings. In the drawings, the same or corresponding members and portions are denoted by the same reference numerals and described.

Embodiment 1.

Fig. 1 is a perspective view showing a schematic configuration of a power converter 100 according to embodiment 1, fig. 2 is a front view showing the power converter 100, fig. 3 is a perspective view showing one current sensor 30a which is a main part of the power converter 100, and fig. 4 is a schematic diagram showing a schematic configuration of the power converter 100. Fig. 1 and 2 are diagrams showing a case surrounding the power conversion device 100 removed, and fig. 4 is a diagram of the substrate 50 viewed from one surface. The power conversion device 100 that performs power conversion is mounted on a vehicle such as an electric vehicle or a hybrid vehicle that uses an electric motor as one of the drive sources. The power conversion apparatus 100 includes 3

bus bars

40a, 40b, and 40c, and each phase current of the 3-phase current flows through the 3

bus bars

40a, 40b, and 40c, respectively. In order to measure the respective current values of the 3-phase currents, the current sensor 30a is provided on the bus 40a, the current sensor 30b is provided on the bus 40b, and the current sensor 30c is provided on the bus 40 c.

< brief summary of construction of Power conversion device 100 >

The power conversion device 100 includes a plate-shaped bus bar 40, a U-shaped core 10 made of a magnetic material, a substrate 50 on which the U-shaped core 10 is disposed, a magnetoelectric conversion element 20 disposed on the substrate 50, and a magnetic material 15. The current sensor 30 includes a U-shaped core 10, a magnetic body 15, a magnetoelectric conversion element 20, and a bus bar 40.

Each of the 3

bus bars

40a, 40b, and 40c is a conductor through which each phase having 3-phase current flows. The bus bar 40 is made of, for example, copper or aluminum. The material of the bus bar 40 is not limited to these, and may be other materials as long as a current flows, and only a material having low resistivity is suitable for the bus bar 40. As shown in fig. 4, bus bar 40 is connected to, for example, power module 60 provided in power conversion device 100.

As shown in fig. 1, the substrate 50 is disposed to face the 3

bus bars

40a, 40b, and 40c, respectively. On the substrate 50, passive components such as an IC (Integrated Circuit), a resistor, a capacitor, and the like, and other necessary electronic components are mounted in addition to the magneto-electric conversion element 20. The substrate 50 has a function of detecting a current flowing through the bus bar 40. The board 50 has a function of detecting a current, and other functions such as a circuit for controlling the operation of the power module 60 based on a current value measured by the current sensor 30. Since the substrate 50 has a plurality of functions, it is not necessary to provide a plurality of substrates 50 for each function, and therefore the power conversion device 100 can be downsized.

The substrate 50 has a plurality of through holes 50 a. The magneto-electric conversion element 20 is disposed in a portion of the substrate 50 between the two through holes 50a, and converts a detected magnetic field into an electric signal to output the electric signal. The magneto-electric conversion element 20 is disposed on a disposition surface that is one surface of the substrate 50 facing the bus bar 40. In the present embodiment, a surface-mount type magnetoelectric conversion element 20 is used, and the magnetoelectric conversion element 20 is surface-mounted on the substrate 50. The mode of the magnetoelectric conversion element 20 is not limited to the surface mounting type, but by using the magnetoelectric conversion element 20 of the surface mounting type, the magnetoelectric conversion element 20 can be easily mounted on the substrate 50, and the productivity of the power conversion device 100 can be improved. In addition, the current sensor 30 can be miniaturized. Further, the influence of vibration on the magneto-electric conversion element 20 can be suppressed, and the accuracy of current detection of the power conversion device 100 can be improved.

As the Magneto-electric conversion element 20, for example, a hall element or an MR (Magneto Resistive) element is used. The MR element is of AMR, GMR or TMR type, but may be any element. The magneto-electric conversion element 20 is not limited to these elements, and may be another element as long as it has a function of converting a detected magnetic field into an electric signal and outputting the electric signal. The arrangement of the magneto-electric conversion element 20 is not limited to one surface of the substrate, and the magneto-electric conversion element 20 may be mounted on the other surface. The magnetic field generated between the two magnetic bodies 15 by the current flowing through the bus bar 40 is not limited to be generated between the two magnetic bodies 15, but is generated by extending to the periphery between the two magnetic bodies 15. Therefore, even if the magneto-electric conversion element 20 is disposed on one surface of the substrate 50, the magneto-electric conversion element 20 can detect a magnetic field caused by a current flowing through the bus bar 40.

The U-shaped core 10 is composed of a bottom portion and leg portions extending from both ends of the bottom portion. Bus bars 40 are disposed inside the U-shaped core 10. In the U-shaped core 10, the two legs of the U-shaped core 10 are inserted into the two through holes 50a, respectively, and are disposed on the substrate 50. The U-shaped core 10 is fixed by bonding to the substrate 50, for example. Since the U-shaped core 10, which is a component of the current sensor 30, is provided integrally with the substrate 50 and shares both spaces, the power conversion device 100 can be downsized in a direction perpendicular to the arrangement surface of the substrate 50. Further, since the leg portions of the U-shaped core 10 are inserted into the through holes 50a, the size of the through holes 50a formed in the substrate 50 can be reduced and the interval between the through holes 50a can be increased, as compared with the case where the C-shaped core is inserted into the through holes and arranged. Since the through-hole 50a can be reduced in size, a decrease in strength of the substrate 50 can be suppressed. Further, since the interval between the two through holes 50a can be increased, the portion of the substrate 50 on which the magneto-electric conversion element 20 is mounted is not reduced, and the strength of the substrate 50 can be suppressed from being lowered. Therefore, even if an external force such as vibration is applied to the power conversion device 100, the through-holes 50a of the substrate 50 can be prevented from being broken.

The two magnetic bodies 15 are disposed on the side of one through-hole 50a and the side of the other through-hole 50a with a space between the two through-holes 50a in the substrate 50 portion. In the present embodiment, a block-shaped magnetic body 15 is used, and two block-shaped magnetic bodies 15 are disposed on the other surface of the substrate 50. The shape of the magnetic body 15 is not limited to a block shape, and may be a plate shape or a sheet shape. The magnetic body 15 may be disposed on one surface of the substrate 50. The magnetic body 15 is mounted on the substrate 50 by, for example, an adhesive or solder. The magnetic body 15 may be fitted into a counter bore (counter bore) formed in the substrate 50. The magnetic body 15 may be screwed to the substrate 50. The magnetic body 15 is not necessarily fixed to the substrate 50, and may be fixed to the leg portion of the U-shaped core 10. By forming the magnetic body 15 in a block shape, the magnetic body 15 can be easily handled, and the magnetic body 15 can be easily mounted on the substrate 50. Further, by forming the magnetic body 15 in a block shape having a certain volume, the magnetism collecting effect on the magnetoelectric conversion element 20 can be improved.

The U-shaped core 10 and the magnetic body 15 are made of, for example, electromagnetic steel sheet, iron, permalloy, or ferrite. These materials may be any ferromagnetic material such as iron, nickel, or cobalt, or a material containing a ferromagnetic material, and the soft magnetic material is particularly suitable. The U-shaped core 10 and the magnetic body 15 may be made of different materials. The U-shaped core 10 may be formed by a wound core or a laminated core.

In the present embodiment, the U-shaped core 10 and the bus bar 40 are integrated with the resin 70. As shown in fig. 2, the range surrounded by the broken line is a portion integrated by the resin 70. When the plurality of U-shaped cores 10 and the plurality of bus bars 40 are integrated, a plurality of components can be handled as one component. Since a plurality of devices can be handled as one component, the assembly and inspection processes can be saved, and the productivity of the power conversion apparatus 100 can be improved. The U-shaped core 10 and the bus bar 40 may be integrated without using the resin 70.

In the present embodiment, as shown in fig. 1, the

current sensors

30a, 30b, and 30c are arranged in parallel at the end of the substrate 50, but the arrangement of the

current sensors

30a, 30b, and 30c is not limited to this. If the through-hole 50a is formed in the substrate 50, the U-shaped core 10 can be disposed even in the center of the substrate 50. Therefore, in the power conversion device 100, the degree of freedom in the arrangement of the electronic components and the

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.

< Current sensor 30>

The current sensor 30a, which is a main part of the present application, will be explained. The current sensor 30a will be described here, but the other

current sensors

30b and 30c also have the same structure. As shown in fig. 3, the current sensor 30a is configured by a U-shaped core 10a, two magnetic bodies 15a1, 15a2, a magneto-electric conversion element 20a, and a bus bar 40a, and the C-shaped core 11a is formed by the U-shaped core 10a and two magnetic bodies 15a1, 15a 2. Air gap 12 is formed between two magnetic bodies 15a1 and 15a 2. A magnetic field generated around the air gap portion 12 by the current flowing through the bus bar 40a is applied to the magnetic induction portion inside the magneto-electric conversion element 20 a. The magnetic induction direction of the magneto-electric conversion element 20a is parallel to the arrangement surface of the substrate 50 on which the magneto-electric conversion element 20a is arranged. The magneto-electric conversion element 20a generates a voltage according to the magnitude of the applied magnetic field, converts the generated voltage into a current value, and outputs an electric signal corresponding to the measured current value to a circuit provided on the substrate 50. Although the IC included in the magneto-electric conversion element 20a is configured to include a relational expression for converting the magnitude of the magnetic field into a current value, the IC may be an independent IC different from the magneto-electric conversion element 20a and the substrate 50 may include an independent IC.

The magneto-electric conversion element 20a also detects an external magnetic field other than a magnetic field generated by a current flowing through the bus bar 40a as a measurement target. The external magnetic field detected by the magneto-electric conversion element 20a becomes an error in current measurement. For example, when the bus bar 40 to be measured is the bus bar 40a, a magnetic field caused by a current flowing through the adjacent bus bars 40b and 40c becomes one of the external magnetic fields. In order to accurately measure the current, it is important to suppress the influence of the external magnetic field. In order to suppress the influence of the external magnetic field, the magnetic induction portion of the magneto-electric conversion element 20a is preferably disposed at the center of the air gap portion 12. An example of an external magnetic field is indicated by arrows in fig. 3. By disposing the magnetism-sensitive portion of the magneto-electric conversion element 20a at the center of the air gap portion 12, the external magnetic field applied to the magnetism-sensitive portion is in a direction that coincides with the axis of symmetry (the one-dot chain line in fig. 3) of the U-shaped core 10a perpendicular to the disposition surface of the substrate 50, and the direction of the magnetic field is not detected because it is not the magnetism-sensitive direction of the magneto-electric conversion element 20 a. The external magnetic field is in a direction perpendicular to the arrangement surface of substrate 50 because the external magnetic field not coinciding with the symmetry axis of U-shaped core 10a is attracted by U-shaped core 10a or two magnetic bodies 15a1, 15a 2.

The C-shaped core 11a inversely proportional to the gap of the air gap 12 is the effect of the magnetic field concentration caused by the current flowing through the bus bar 40 a. The distance between air gap 12 can be adjusted by changing the length in the direction parallel to the arrangement surface of substrate 50 of two magnetic bodies 15a1, 15a2 constituting air gap 12. The magnetic field concentration effect can be improved by shortening the distance between the air gap portions 12 by increasing the length of the two magnetic bodies 15a1, 15a 2. Since the adjustment of the gap between the air gap portions 12 is performed only by the two magnetic bodies 15a1, 15a2, the adjustment can be easily performed without replacing the U-shaped core 10 a. Further, by extending the lengths of the two magnetic bodies 15a1, 15a2, the external magnetic field can be further attracted by the magnetic bodies 15a1, 15a2, and therefore the magneto-electric conversion element 20a is less susceptible to the external magnetic field.

In the present embodiment, the magneto-electric conversion element 20a is disposed on one surface of the substrate 50 facing the bus bar 40 a. When the magneto-electric conversion element 20a is disposed on one surface of the substrate 50, the magneto-electric conversion element 20a is disposed inside the C-shaped core 11a on the side close to the bottom of the U-shaped core 10a, i.e., on the side of the bus bar 40 a. As shown in fig. 3, since the external magnetic field is attracted to the U-shaped core 10a or the two magnetic bodies 15a1, 15a2, the magneto-electric conversion element 20a is disposed on one surface of the substrate 50 away from the external magnetic field, and thus the magneto-electric conversion element 20a is less susceptible to the external magnetic field. Since the influence of the external magnetic field as noise is reduced and the SN ratio (signal-to-noise ratio) can be increased, the accuracy of current detection of the power conversion device 100 can be improved.

As described above, in the power conversion device 100 according to embodiment 1, since the U-shaped core 10 is disposed on the substrate 50 by inserting the two leg portions of the U-shaped core 10 made of a magnetic material into the two through holes 50a provided in the substrate 50, the U-shaped core 10 is provided integrally with the substrate 50 and shares a space between the U-shaped core 10 and the substrate 50, and the power conversion device 100 can be downsized in a direction perpendicular to the disposition surface of the substrate 50. Further, since the leg portion of the U-shaped core 10 is inserted into the through hole 50a, the size of the through hole 50a can be reduced and the interval between the two through holes 50a can be increased. Further, since the through-hole 50a can be made small, the strength of the substrate 50 can be suppressed from being lowered. Further, since the interval between the two through holes 50a can be increased, the portion of the substrate 50 on which the magneto-electric conversion element 20 is mounted is not reduced, and the strength of the substrate 50 can be suppressed from being lowered. In addition, even if an external force such as vibration is applied to the power conversion device 100, the through-holes 50a of the substrate 50 can be prevented from being broken.

Further, since the two magnetic bodies 15 are disposed on the side of the one through-hole 50a and the side of the other through-hole 50a with a space therebetween in the substrate 50 portion between the two through-holes 50a, and the C-shaped core 11 is formed by the U-shaped core 10 and the two magnetic bodies 15, it is possible to suppress a decrease in strength of the substrate 50 on which the C-shaped core 11 is disposed while maintaining the high magnetism collecting effect of the C-shaped core 11 and the downsizing of the power conversion device 100. In addition, when the magneto-electric conversion elements 20 are disposed on the disposition surface that is one surface of the substrate 50 facing the bus bars 40, the influence of the external magnetic field applied to the magneto-electric conversion elements 20 can be suppressed. In addition, when two block-shaped magnetic bodies 15 are disposed on the other surface of the substrate 50, the magnetic bodies 15 can be easily mounted on the substrate 50, and productivity of the power conversion device 100 can be improved.

In addition, when the magneto-electric conversion element 20 is surface-mounted on the substrate 50, the influence of vibration on the magneto-electric conversion element 20 can be suppressed, and the accuracy of current detection of the power conversion device 100 can be improved. In addition, when the U-shaped core 10 and the bus bar 40 are integrated by the resin 70, since a plurality of components can be handled as one component, the assembly and inspection processes can be saved, and the productivity of the power conversion device 100 can be improved. When the power conversion device 100 includes the power module 60 connected to the bus bar 40 and the substrate 50 includes a circuit for controlling the operation of the power module 60, the substrate 50 is provided with a plurality of functions, and it is not necessary to provide a plurality of substrates 50 for each function, so that the power conversion device 100 can be downsized.

Embodiment 2.

The power conversion device 100 according to embodiment 2 will be explained. Fig. 5 is a perspective view showing one current sensor 30a that is a main part of the power conversion device 100 according to embodiment 2. The power conversion device 100 according to embodiment 2 is configured to include the magnetic substance 16 on one surface of the substrate 50 in addition to the configuration shown in embodiment 1.

The two block-shaped

magnetic bodies

15 and 16 are disposed on both the one surface and the other surface of the substrate 50. The two

magnetic bodies

15 and 16 may be made of the same material, but may be made of different materials. But may also be of different shapes. Since the two

magnetic bodies

15 and 16 are mounted on both surfaces of the substrate 50, through holes may be provided in the

magnetic bodies

15 and 16 and the substrate 50 on which the

magnetic bodies

15 and 16 are mounted, and the

magnetic bodies

15 and 16 and the substrate 50 may be screwed by the through holes. Further, the

magnetic bodies

15 and 16 disposed on either surface may be provided with screw holes, and the

magnetic bodies

15 and 16 may be disposed on the substrate 50 by screw-locking. When a screw hole is provided in any of the

magnetic bodies

15 and 16, the

magnetic body

15 or 16 provided with the screw hole functions as a nut, and the

magnetic bodies

15 and 16 can be firmly fixed to the substrate 50 by screw locking.

Since the magnetic body 16 is provided on one surface of the substrate 50, the magnetic body 16 is disposed at a position close to the magnetoelectric conversion elements 20a on both sides of the magnetoelectric conversion element 20 a. Therefore, a stronger magnetic field is applied to the magneto-electric conversion element 20a than in embodiment 1, and the magnetism collecting effect on the magneto-electric conversion element 20a can be improved. On the other hand, since the magnetic body 15 is provided at the same position as that of embodiment 1 and the external magnetic field directed toward the magneto-electric conversion element 20a is attracted to the magnetic body 15, the influence of the external magnetic field on the magneto-electric conversion element 20a can be suppressed. As an effect of improving the magnetic flux collection effect on the magnetoelectric conversion element 20a and suppressing the influence of the external magnetic field on the magnetoelectric conversion element 20a, the S/N ratio can be further increased, and therefore, the accuracy of current detection of the power conversion device 100 can be improved. Further, as in embodiment 1, the magneto-electric conversion element 20a is disposed on the disposed surface that is one surface of the substrate 50 facing the bus bar 40, but may be disposed on the other surface.

As described above, in the power conversion device 100 according to embodiment 2, since the two block-shaped

magnetic bodies

15 and 16 are disposed on both the one surface and the other surface of the substrate 50, the magnetism collecting effect on the magnetoelectric conversion element 20a can be improved. Further, the influence of the external magnetic field on the magneto-electric conversion element 20a can be suppressed.

Embodiment 3.

A power conversion device 100 according to embodiment 3 will be described. Fig. 6 is a perspective view showing one current sensor 30a that is a main part of the power conversion device 100 according to embodiment 3. The power converter 100 according to embodiment 3 is configured to include two magnetic bodies 17 in a substrate 50.

The two magnetic bodies 17 are embedded in the substrate 50. The two magnetic members 17 are disposed on the side of one through-hole 50a and the side of the other through-hole 50a with a space therebetween in the substrate 50 portion between the two through-holes 50 a. The two magnetic bodies 17 are magnetic bodies that are formed in the substrate 50 when the substrate 50 is formed. The two magnetic bodies 17 can be formed, for example, by using a layer inside or on the back surface of the multilayer substrate. The layers utilized may be one or more layers. In the case of multiple layers, since magnetic substance 17 can be made thick, the uniformity of the magnetic field between two magnetic substances 17a1 and 17a2 can be improved. As the magnetic material 17, a ferromagnetic material or a ferromagnetic material containing a ferromagnetic material is used, similarly to the magnetic material 15.

In the two magnetic bodies 17 provided in the substrate 50, the C-shaped core 11a is formed by combining with the U-shaped core 10a, and therefore, a high magnetic convergence effect of the C-shaped core 11a can be obtained. Further, since the external magnetic field directed toward the magneto-electric conversion element 20a is attracted to the magnetic body 17, the influence of the external magnetic field on the magneto-electric conversion element 20a can be suppressed. Further, as in embodiment 1, the magneto-electric conversion element 20a is disposed on the disposed surface that is one surface of the substrate 50 facing the bus bar 40, but may be disposed on the other surface.

As described above, in the power converter 100 according to embodiment 3, the two magnetic bodies 17 are disposed in the substrate 50 and are provided integrally with the substrate 50, and therefore, a step of mounting the magnetic bodies 17 on the substrate 50 is not required, and productivity of the power converter 100 can be improved. Further, since the two magnetic bodies 17 are arranged in the substrate 50, the magnetic bodies 17 are prevented from being separated from the substrate 50, and thus the high magnetic concentration effect of the C-shaped core 11a can be maintained. In addition, when the magnetic substance 17 is disposed by using the layers of the multilayer substrate, the magnetic substance 17 can be disposed with high positioning accuracy.

Embodiment 4.

A power conversion device 100 according to embodiment 4 will be described. Fig. 7 is a perspective view showing one current sensor 30a that is a main part of the power converter 100 according to embodiment 4, and fig. 8 is a perspective view showing the magnetic body 18 of the power converter 100. Power conversion device 100 according to embodiment 4 is configured by disposing magnetic body 18 including a nonmagnetic body.

Two magnetic bodies 18 include non-magnetic bodies 18a on one or both of the one surface and the other surface. In the present embodiment, as shown in fig. 8, magnetic body 18 includes nonmagnetic body 18a on both of one surface and the other surface, but nonmagnetic body 18a may be provided only on the surface that contacts substrate 50. As with magnetic body 15, a ferromagnetic body or a ferromagnetic material including a ferromagnetic body is used as the material of magnetic body 18b sandwiched between nonmagnetic bodies 18 a. The material of nonmagnetic body 18a is, for example, a glass epoxy resin as a raw material of substrate 50, but is not limited thereto. Magnetic element 18 can be formed using a multilayer substrate. Magnetic substance to be magnetic portion 18b is provided on all layers of the multilayer substrate to produce a multilayer substrate, and then magnetic substance 18 is produced by cutting the multilayer substrate to have the size of magnetic substance 18. By providing non-magnetic body 18a, magnetic body 18 can be handled in the same manner as substrate 50, and therefore magnetic body 18 can be handled easily. By providing non-magnetic material 18a, magnetic portion 18b can be protected in the manufacturing process of power converter 100.

Copper foil 18c as a non-magnetic material may be further provided on the surface contacting substrate 50 of magnetic material 18. By providing copper foil 18c, soldering can be easily performed when magnetic substance 18 is mounted on substrate 50. Since magnetic body 18 can be handled as one electronic component, magnetic body 18 can be mounted on substrate 50 by a chip mounter or the like, and magnetic body 18 can be soldered to substrate 50 by a reflow process or the like. Since the work of mounting magnetic body 18 on substrate 50 is automated by surface mounting magnetic body 18 on substrate 50 as an electronic component, productivity of power conversion device 100 can be improved. In addition, the accuracy of mounting magnetic substance 18 on substrate 50 can be improved.

Since C-shaped core 11a is formed by combining two magnetic bodies 18 including non-magnetic body 18a with U-shaped core 10a, a high magnetic flux concentration effect of C-shaped core 11a can be obtained. Further, since the external magnetic field directed to the magneto-electric conversion element 20a is attracted to the magnetic body 18, the influence of the external magnetic field on the magneto-electric conversion element 20a can be suppressed. Further, as in embodiment 1, the magneto-electric conversion element 20a is disposed on the disposed surface that is one surface of the substrate 50 facing the bus bar 40, but may be disposed on the other surface.

As described above, in power conversion device 100 according to embodiment 4, since two magnetic bodies 18 include non-magnetic body 18a on one or both of the one surface and the other surface and can be handled as an electronic component, magnetic body 18 can be easily mounted on substrate 50. In addition, when copper foil 18c, which is a non-magnetic material, is provided on magnetic substance 18, the work of mounting magnetic substance 18 on substrate 50 can be automated. In addition, when the work of mounting magnetic substance 18 on substrate 50 is automated, productivity of power conversion device 100 can be improved.

Embodiment 5.

A power conversion device 100 according to embodiment 5 will be described. Fig. 9 is a perspective view showing one current sensor 30a that is a main part of the power conversion device 100 according to embodiment 5. The power conversion device 100 according to embodiment 5 is configured to include the position adjustment portion 80 of the U-shaped core 10 in addition to the configuration shown in embodiment 1.

The current sensor 30a of the power conversion device 100 includes a position adjustment portion 80, and the position adjustment portion 80 adjusts the position of the U-shaped core 10a in the direction perpendicular to the substrate 50. The position adjusting portion 80 is constituted by, for example, a position adjusting through hole 80a provided in each of the two leg portions of the U-shaped core 10a, and a U-shaped pin 80b fitted into the position adjusting through hole 80 a. The pin 80b is made of a non-magnetic material, such as non-magnetic stainless steel. The structure of the position adjustment portion 80 is not limited to this, and the substrate 50 may be provided with a mechanism for holding the leg portion of the U-shaped core 10a by being sandwiched between the substrates 50. When the position of the U-shaped core 10a is determined, the pin 80b is moved in the direction of the broken line arrow shown in fig. 9 so as to be fitted into the position adjustment through hole 80 a. The pin 80b is then fixed to the base plate 50, for example, by adhesion.

The internal specifications of the power converter 100 are changed in accordance with the functions and the like required for the power converter 100. Depending on the specification change, the U-shaped core 10a having a different size may be required for the power conversion device 100. By providing the position adjustment portion 80, it is not necessary to prepare U-shaped cores 10a having different sizes for each specification, and one U-shaped core 10a can be used in a plurality of specifications.

Further, the length of the leg portion of the U-shaped core 10a protruding from the substrate 50 can be changed by including the position adjusting portion 80. Since the external magnetic field is attracted to the leg portions of the U-shaped core 10a protruding from the substrate 50, the influence of the external magnetic field on the magnetoelectric conversion element 20a can be adjusted by changing the length of the leg portions protruding from the substrate 50. The accuracy of the current sensor 30a can be adjusted by adjusting the influence of the external magnetic field on the magneto-electric conversion element 20 a.

As described above, in the power conversion device 100 according to embodiment 5, since the current sensor 30 includes the position adjustment portion 80 that adjusts the position of the U-shaped core 10 in the direction perpendicular to the substrate 50, it is not necessary to prepare U-shaped cores 10 having different sizes for each specification of the power conversion device 100, and one U-shaped core 10 can be used for a plurality of specifications of the power converter 100. Since one U-shaped core 10 can be used in a variety of specifications of the power conversion device 100, the productivity of the power conversion device 100 can be improved. Further, since the length of the leg portion of the U-shaped core 10a protruding from the substrate 50 can be changed by providing the position adjustment portion 80, the influence of the external magnetic field on the magneto-electric conversion element 20 can be adjusted, and the accuracy of the current sensor 30a can be adjusted.

Although various exemplary embodiments and examples have been described in the present application, the various features, modes, and functions described in 1 or more embodiments are not limited to the application to specific embodiments, and may be applied to the embodiments alone or in various combinations.

Therefore, it is considered that numerous modifications not illustrated are also included in the technical scope disclosed in the present specification. For example, it is assumed that the case where at least one component is modified, added, or omitted, and the case where at least one component is extracted and combined with the components of other embodiments are included.

Description of the reference symbols

10U-shaped core body

11C-shaped core body

12 air gap part

15 magnetic body

16 magnetic body

17 magnetic body

18 magnetic body

18a nonmagnetic body

18b magnetic part

18c copper foil

20 magnetoelectric conversion element

30 current sensor

40 bus

50 base plate

50a through hole

60 power module

70 resin

80 position adjusting part

80a position adjusting through hole

80b pin

100 power conversion device.

Claims

1. A power conversion apparatus, comprising:

a plate-shaped bus bar;

a U-shaped core body made of a magnetic material, the bus bar being disposed inside the U-shaped core body;

a substrate having two through holes into each of which each of the two leg portions of the U-shaped core is inserted;

two magnetic bodies disposed on one side of the through hole and the other side of the through hole at a distance from each other in the substrate portion between the two through holes; and

a magneto-electric conversion element disposed in the substrate portion between the two through holes, for converting a detected magnetic field into an electric signal and outputting the electric signal,

the C-shaped core body is formed by the U-shaped core body and the two magnetic bodies.

2. The power conversion apparatus according to claim 1,

the magnetoelectric conversion element is disposed on one surface of the substrate that faces the bus bar.

3. The power conversion apparatus of claim 2,

the two block-shaped magnetic bodies are disposed on one or both of one surface and the other surface of the substrate.

4. The power conversion apparatus of claim 2,

the two magnetic bodies are disposed in the substrate.

5. The power conversion apparatus according to claim 3,

the two magnetic bodies are provided with a non-magnetic body on one or both of the one surface and the other surface.

6. The power conversion apparatus according to any one of claims 1 to 5,

the surface of the magnetoelectric conversion element is mounted on the substrate.

7. The power conversion apparatus according to any one of claims 1 to 6,

the U-shaped core and the bus bar are integrated with each other by resin.

8. The power conversion apparatus according to any one of claims 1 to 7,

comprises a power module connected with the bus bar,

the substrate has a circuit for controlling the operation of the power module.

9. The power conversion apparatus according to any one of claims 1 to 8,

the positioning device comprises a position adjusting part which adjusts the position of the U-shaped core body in the direction vertical to the substrate.