CN214539763U - Current detection device - Google Patents
Current detection device Download PDFInfo
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- CN214539763U CN214539763U CN202120544071.3U CN202120544071U CN214539763U CN 214539763 U CN214539763 U CN 214539763U CN 202120544071 U CN202120544071 U CN 202120544071U CN 214539763 U CN214539763 U CN 214539763U
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/207—Constructional details independent of the type of device used
Abstract
The utility model provides a can detect the current sensor who flows the electric current of power module steadily to miniaturized current detection device has been realized. The current detection device includes: a case 10 provided with a 1 st housing portion 11 and a 2 nd housing portion 12, and a current sensor 2 housed in the 2 nd housing portion 12. The current sensor 2 is provided with at least two conductors 30 and at least two magnetoelectric conversion units 20, and the magnetoelectric conversion units 20 are provided with at least two magnetic detection elements and output signals corresponding to differences in magnetic flux densities of orthogonal components input to each detection surface of the at least two magnetic detection elements and an orthogonal detection surface of magnetic flux, respectively. The at least two conductors 30 are provided with extension portions 34a, 34b and recessed portions, respectively, and the at least two magnetoelectric conversion units 20 are provided in a state in which the detection surfaces face each orthogonal portion of the recessed portions, respectively, which are disposed on the recessed portions provided on the 2 nd housing portion 12.
Description
Technical Field
The utility model relates to a detect current detection device who flows through conductor.
Background
Conventionally, when measuring a current flowing through a conductor, a technique is employed in which a magnetic flux density of a magnetic field generated around the conductor by the current flowing through the conductor is detected via a magnetic detection element, and the current applied to the conductor is calculated based on the detected magnetic flux density. For example, patent documents 1 and 2 listed below describe a configuration in which a current sensor is brought close to a power module by using such a technique.
Patent document 1 discloses a configuration in which a power module and a current sensor are mounted on a power control unit. The current sensor is disposed outside the power module and detects a current flowing through a conductive strip disposed between the power module and the connector. That is, the power module and the current sensor are separately constructed in the power control unit.
Patent document
Patent document 1: japanese laid-open patent publication No. 2012-105370
Patent document 2: japanese patent laid-open publication No. 2018-121418
SUMMERY OF THE UTILITY MODEL
In the technique disclosed in patent document 1, since the current sensor is disposed outside the power module, there is room for improvement in further downsizing the device. In the technique disclosed in patent document 2, since the current sensor has a core, it is also difficult to achieve miniaturization of a power module in which the current sensor is integrated. Further, since the hall element constituting the current sensor is mounted on the circuit board disposed on the upper surface of the power module case, it is necessary to dispose the hall element in the gap between the core bodies in consideration of the positional accuracy of the power module and the circuit board. Therefore, this also inevitably causes the gap of the core to become larger, eventually causing the current sensor to be easily affected by the disturbance magnetic flux, thereby affecting the control performance of the motor.
Therefore, there is a need for a current sensor capable of stably detecting a current flowing through a power module and realizing a miniaturized current detection device.
The utility model discloses a current detection device's characteristic structure does, possesses: a case provided with a 1 st housing section for housing the power module and a 2 nd housing section for housing the current sensor at a position adjacent to the 1 st housing section; and the current sensor, the above-mentioned current sensor is taken in the above-mentioned 2 nd taking in department; the current sensor includes at least two conductors each having a detection surface facing in the same direction as the conductor and capable of detecting a magnetic flux density of a magnetic flux input to the detection surface, and at least two magnetoelectric conversion units each having at least two magnetic detection elements each having a detection surface facing in the same direction as the conductor and capable of detecting a magnetic flux density of the magnetic flux input to the detection surface, and each outputting a signal corresponding to a difference in the magnetic flux density of an orthogonal component orthogonal to the detection surface of the magnetic flux input to the detection surface of each of the at least two magnetic detection elements, wherein each of the at least two conductors includes an extension portion extending in a 2 nd direction toward the 1 st accommodation portion and orthogonal to a 1 st direction which is an adjacent direction of the adjacent two conductors, the recessed portion has an orthogonal portion that is orthogonal to both the 1 st direction and the 2 nd direction and extends in the 3 rd direction, and is recessed in the 3 rd direction with respect to the extending portion, the at least two magnetoelectric conversion units are each provided in a state in which the detection surface faces the orthogonal portion of each of the recessed portions, and the recessed portion is disposed in a recessed portion provided in the 2 nd housing portion.
With this configuration, the current sensor can be configured by the conductor electrically connected to the power module and the magneto-electric conversion unit without requiring the magnetism collecting core and the shield core, and thus the current sensor can be miniaturized. Accordingly, the current detection device is equipped with the 1 st housing part for housing the power module and the 2 nd housing part for housing the current sensor, thereby being capable of easily realizing miniaturization and stably detecting the current flowing through the plurality of conductors.
As another characteristic configuration, it is preferable that the case is formed so that a heat sink can be disposed on an outer bottom surface of a bottom portion on a side opposite to a side where the current sensor is housed, at least in the vicinity of the concave portion.
In a current sensor, the conductor heats up as current flows through the conductor. At this time, the magneto-electric conversion unit located near the recessed portion of the conductor is affected by heat generated by the conductor, and the temperature of the magneto-electric conversion unit may become high. Since the magneto-electric conversion unit has temperature characteristics, and its output voltage changes when the temperature becomes high, a current detection device capable of preventing the magneto-electric conversion unit from entering a high temperature state is urgently needed. In the structure of the present invention, the case is configured such that the heat sink can be disposed on an outer bottom surface of a bottom portion of the case opposite to a side where the current sensor is housed, the outer bottom surface being at least near the concave portion. With this configuration, the heat sink can be easily disposed in close contact with the outer bottom surface of the bottom of the case. This makes it possible to reliably dissipate heat generated by the conductor to the outside via the heat sink attached to the case from the recessed portion housed in the recessed portion of the case, and ultimately suppress a temperature increase in the magnetoelectric conversion unit.
As another characteristic configuration, in the current sensor, it is preferable that the two magnetoelectric conversion units provided in the concave portions of the two adjacent conductors are mounted on different surfaces of one substrate, an upper portion of the 2 nd housing portion of the case is open, and a terminal connected to the substrate extends upward of the case.
With this configuration, the magnetoelectric conversion units can be positioned with respect to the plurality of concave portions with reference to one surface and the other surface of the single substrate. Therefore, it is possible to easily dispose the magneto-electric conversion unit at a desired position for each of the plurality of concave portions and to minimize the number of used blocks of the substrate. The case may have a connection terminal for connecting the housed power module to another device, and such a connection terminal may extend upward of the case. Therefore, by extending the terminals connected to the board upward of the housing, the extending direction of the terminals connected to the board can be made to coincide with the extending direction of the connection terminals for other devices. Thus, when the current detection device is connected to another device such as a motor driver, it is possible to connect the terminal connected to the board and the connection terminal provided in the housing to the device from the same direction. As a result, the current detection device can be easily connected to another device.
As another characteristic configuration, in the current sensor, it is preferable that the concave portion of at least one of the concave portions provided in the at least two conductors is provided closer to the 1 st accommodation portion than the concave portions of the other conductors, the case has a partition portion on the 1 st accommodation portion side of the concave portion, and a distance between an outer side surface of the partition portion and each of the concave portions of the at least two conductors is fixed.
In the current detection device, distances between the concave portions provided in the plurality of conductors and the outer side surface of the partition portion located on the 1 st housing portion side of the concave portion of the case may be different. In this case, even if the heat sink is disposed in close contact with the outer bottom surface of the bottom portion of the case, the heat transferred to the heat sink by the conductor having the larger distance from the concave portion to the outer side surface of the partition portion is smaller than that of the other conductor having the smaller distance from the concave portion to the outer side surface of the partition portion. Therefore, it is not possible to sufficiently suppress the temperature rise of the magnetoelectric conversion unit located in the vicinity of the conductor where the distance from the concave portion to the outer side surface of the partition portion is long, which is caused by the heat generated by the conductor. Therefore, the present invention adopts a structure in which the outer side surface of the partition portion is kept at a fixed distance from each of the concave portions of the at least two conductors. With this configuration, the heat generated by the plurality of conductors can be uniformly dissipated from the concave portion through the heat sink by bringing the heat sink into contact with the outer surface of the partition portion disposed in the concave portion. Finally, temperature increases of all the magnetoelectric conversion units arranged in the current detection device can be uniformly suppressed.
As another characteristic configuration, it is preferable that the case further includes a heat sink that extends from the 1 st housing portion to the 2 nd housing portion in a plan view, and an outer bottom surface of a bottom portion of the case on a side opposite to a side where the current sensor is housed is in close contact with an outer side surface of the recess portion on the 1 st housing portion side.
With this configuration, the heat generated by the power module housed in the 1 st housing section and the conductor of the current sensor housed in the 2 nd housing section can be efficiently dissipated to the outside through the heat sink. This can effectively suppress temperature increases in the power module and the magnetoelectric conversion unit of the current sensor.
Drawings
Fig. 1 is a perspective view of a current detection device.
Fig. 2 is an exploded perspective view of the current detection device.
Fig. 3 is an expanded view of the current sensor.
Fig. 4 is a plan view of the current detection device.
Fig. 5 is a plan view of the current sensor.
Fig. 6 is a side sectional view of the current detection device.
Fig. 7 is a plan sectional view of the current detection device.
Fig. 8 is a diagram illustrating a detection surface of the magneto-electric conversion unit.
Fig. 9 is a diagram showing an example of the magnetic flux density input to the detection surface.
Fig. 10 is a block diagram of the magnetoelectric conversion unit.
Fig. 11 is a plan sectional view of a current detection device according to another embodiment.
Detailed Description
As shown in fig. 1 to 7, the current detection device 100 includes a power module case 10 (an example of a case) that houses a power module 1 (see fig. 6) for switching a three-phase motor (not shown), and a plurality of current sensors 2 that are housed in the power module case 10 and detect currents flowing through a plurality of conductive bars 30 (an example of a conductor). Here, the power module 1 is a generic name of a device in which a switching element and the like are mounted on a power module case 10.
The power module case 10 is provided with a 1 st housing portion 11 for housing the power module 1 (see fig. 6) and a 2 nd housing portion 12 for housing the current sensor 2 at a position adjacent to the 1 st housing portion 11. The power module case 10 further includes a connection terminal 5 for connecting the power module 1 housed in the 1 st housing part 11 to another device. The connection terminal 5 is provided to extend upward from an upper surface 16 between the 1 st housing part 11 and the 2 nd housing part 12.
The current sensor 2 housed in the 2 nd housing portion 12 of the power module case 10 is configured to be compact without using a core member. The current sensor 2 of the present embodiment will be described below. When a current flows through a conductor, a magnetic field (right-hand rule) centered on the conductor is generated based on the magnitude of the current, the magnetic flux density of the magnetic flux in the magnetic field is detected via the current sensor 2, and the current (current value) flowing through the conductor is measured based on the detected magnetic flux density.
Fig. 2 is an exploded perspective view of the current detection device 100, and fig. 3 is an expanded view of the current sensor 2. In the present embodiment, the at least two conductive strips 30 on the current sensor 2 are three conductive strips connected to a three-phase motor. More specifically, the conductive bars 30 electrically connect three terminals of a three-phase motor and three terminals of an inverter for controlling current flowing through the three-phase motor, respectively. Therefore, in the following description, at least two conductive strips 30 are represented by three conductive strips 30, and if three conductive strips 30 need to be distinguished separately, the 1 st conductive strip 31, the 2 nd conductive strip 32, and the 3 rd conductive strip 33 are represented.
As shown in fig. 1 to 3, the current sensor 2 is composed of three conductive bars 30 and three magnetoelectric conversion units 20. As shown in fig. 1 and 2, the power module case 10 is formed in the form of an inserted conductive strip 30. The power module case 10 is made of resin such as PPS (polyphenylene sulfide), PBT (polybutylene terephthalate), LCP (liquid crystal polymer), or the like. In the bus bar 30, the 1 st extension 34a on the 1 st housing part 11 side is electrically connected to the power module 1, and the 2 nd extension 34b on the opposite side of the 1 st housing part 11 is electrically connected to a connector of a motor or the like (not shown). The 2 nd extending portion 34b of the conductive strip 30 is formed with a through hole 38. The power module case 10 has a bus bar nut 6 disposed below the 2 nd extending portion 34b of the bus bar 30. The through hole 38 and the bus bar nut 6 can be connected to other members such as a connection terminal of the motor. The 1 st extension portion 34a and the 2 nd extension portion 34b are parallel to each other but not on the same plane when viewed along a first direction (X direction) described later (see fig. 3 and 6). However, the 1 st extension portion 34a and the 2 nd extension portion 34b are not limited thereto, and may be parallel and on the same plane when viewed along the first direction (X direction).
The three conductive strips 30 respectively have a 1 st extension 34a and a 2 nd extension 34b (hereinafter, collectively referred to as "extensions 34"), and a recessed portion 35 provided between the 1 st extension 34a and the 2 nd extension 34 b. The extending portion 34 extends along the 2 nd direction which is the 1 st direction orthogonal to the adjoining directions of the two conductive strips 30 adjoining each other. The two conductive strips 30 adjacent to each other are two conductive strips 30 of the 1 st conductive strip 31 and the 2 nd conductive strip 32 adjacent to each other, and two conductive strips 30 of the 2 nd conductive strip 32 and the 3 rd conductive strip 33 adjacent to each other. The direction in which 1 st conductive strip 31 and 2 nd conductive strip 32 are adjacent and the direction in which 2 nd conductive strip 32 and 3 rd conductive strip 33 are adjacent are in the adjacent direction, which is equivalent to the X direction in fig. 1 to 7.
In the present embodiment, such adjacent directions are collectively referred to as the 1 st direction. The 2 nd direction is a direction orthogonal to the 1 st direction. In the present embodiment, the Y direction corresponds to fig. 1 to 7. Therefore, in each conductive strip 30, the extension 34 corresponds to a portion along the Y direction.
The concave portion 35 has an orthogonal portion 36 extending in a 3 rd direction orthogonal to both the 1 st direction and the 2 nd direction, and is recessed in the 3 rd direction with respect to the extending portion 34. In the present embodiment, the 1 st direction is the X direction, and the 2 nd direction is the Y direction. Therefore, the 3 rd direction orthogonal to both the 1 st direction and the 2 nd direction corresponds to the Z direction in fig. 1 to 7. The concave portion 35 is provided with an orthogonal portion 36 extending along such a Z direction. As a result, as shown in fig. 3, the extending portion 34 and the orthogonal portion 36 are orthogonal to each other, and the concave portion 35 is formed in a shape recessed in the Z direction from the extending portion 34 via the orthogonal portion 36.
However, in the present embodiment, as shown in fig. 3, the concave portion 35 has a U-shape as viewed from the X direction (in the present embodiment, a shape having two corners on the bottom side opposite to the opening portion of the U-shape). Therefore, in the present embodiment, the one concave portion 35 is configured to have two orthogonal portions 36 opposed to each other and one bottom portion 37 sandwiched by the two orthogonal portions 36.
The 2 nd receiving part 12 of the power module case 10 is provided with a recess 13, and the recess 13 is formed along the 3 rd direction of the conductive strip 30. The concave portion 35 is disposed in the concave portion 13 provided in the 2 nd housing portion 12.
In this embodiment, as shown in fig. 3 and fig. 5, the 1 st extending portion 34a and the 2 nd extending portion 34b of the 1 st conductive strip 31, the 2 nd conductive strip 32 and the 3 rd conductive strip 33 are respectively aligned in a row along the 1 st direction. The 1 st extending portion 34a and the 2 nd extending portion 34b are parallel to each other and have a portion overlapping each other in a row when viewed from the X direction.
At least two magnetoelectric conversion units 20 are respectively arranged on each conductive strip 30. In this embodiment, conductive strip 30 is formed from three conductive strips, 1 st 31, 2 nd 32 and 3 rd 33. The magnetoelectric conversion units 20 are respectively disposed on each conductive strip 30, i.e., on the 1 st conductive strip 31, the 2 nd conductive strip 32 and the 3 rd conductive strip 33, so there are three magnetoelectric conversion units 20 on the current sensor 2. In the present embodiment, at least two magnetoelectric conversion units 20 are represented by three magnetoelectric conversion units 20, and if it is necessary to distinguish the three magnetoelectric conversion units 20 separately, the magnetoelectric conversion units 21 corresponding to the 1 st conductive strip 31, the magnetoelectric conversion units 22 corresponding to the 2 nd conductive strip 32, and the magnetoelectric conversion units 23 corresponding to the 3 rd conductive strip 33 are represented.
The three magnetoelectric conversion units 20 are mounted on mutually different surfaces on the same substrate 60. That is, if two conductive strips 30 adjacent to each other are set as the 1 st conductive strip 31 and the 2 nd conductive strip 32, the magneto-electric conversion unit 21 provided on the concave portion 35 of the 1 st conductive strip 31 is mounted on one surface 61 of the substrate 60, and the magneto-electric conversion unit 22 provided on the concave portion 35 of the 2 nd conductive strip 32 is mounted on the other surface 62 of the substrate 60. Similarly, if two conductive strips 30 adjacent to each other are set as the 2 nd conductive strip 32 and the 3 rd conductive strip 33, the magneto-electric conversion unit 23 provided on the concave portion 35 of the 3 rd conductive strip 33 is mounted on one surface 61 of the substrate 60, and the magneto-electric conversion unit 22 provided on the concave portion 35 of the 2 nd conductive strip 32 is mounted on the other surface 62 of the substrate 60.
As described above, according to the current sensor 2, by mounting the magneto-electric conversion units 20 provided in the concave portions 35 of the three conductive strips 30, respectively, on one substrate 60, it is possible to easily position the magneto-electric conversion units 20 with respect to the concave portions 35, and to arrange them at desired positions. Further, since the current sensor 2 can be constituted by the conductive strip 30 and the magneto-electric conversion unit 20, miniaturization is achieved.
The power module case 10 has an upper portion opened in the 2 nd accommodation portion 12. The upper side of the 2 nd housing portion 12 (or the power module case 10) is a direction opposite to the direction from the current sensor 2 in the Z direction toward the bottom 14 near the recess 13 of the 2 nd housing portion 12, that is, toward the opening of the recess 13. The terminal 63 connected to the substrate 60 extends upward of the 2 nd receiving portion 12.
The power module case 10 has a connection terminal 5 for connecting the power module 1 housed in the 1 st housing part 11 to another device. The connection terminal 5 extends upward in the Z direction from the upper face 16 of the power module case 10. Therefore, by extending the terminals 63 connected to the substrate 60 upward of the power module case 10, the extending direction of the terminals 63 connected to the substrate 60 can be made to coincide with the extending direction of the connection terminals 5 for other devices. Thus, when the current detection device 100 is connected to another device such as a motor driver, the terminal 63 and the connection terminal 5 can be connected to the device from the same direction. As a result, the current detection device 100 can be easily connected to another device.
As shown in fig. 6, the substrate 60 is fixed at the position of the 2 nd housing part 12 by injecting the sealing material 17 into the 2 nd housing part 12. The end of the terminal 63 is exposed from the sealing material 17 to exchange signals with the outside. The sealing material 17 is not particularly limited as long as it has insulating properties, and for example, epoxy resin. Instead of the sealing material 17, the substrate 60 may be fixed to the power module case 10 by screws or the like.
Thus, the current sensor 2 does not need a magnetism collecting core and a shielding core, and can be constituted by the conductive strip 30 and the magnetoelectric conversion unit 20, thereby enabling miniaturization of the current sensor 2. Accordingly, the current detection device 100 can be easily miniaturized by mounting the 1 st housing portion 11 housing the power module 1 and the 2 nd housing portion 12 housing the current sensor 2.
In the present embodiment, two magnetic detection elements 52 are provided in the magnetoelectric conversion unit 20. The magnetic detecting element 52 is a device having a function of detecting a magnetic flux density of a magnetic flux, for example, a hall element. In the present embodiment, as shown in fig. 8, the magneto-electric conversion unit 20 is configured to include two magnetic detection elements 52 in a resin package 51 having a plurality of electrodes 50.
Each of the two magnetic detection elements 52 has a detection surface 53, and a magnetic flux corresponding to the detection target magnetic flux density is input to the detection surface 53. The two magnetic detection elements 52 are arranged such that the detection surfaces 53 face in the same direction. It should be noted that the detection surface 53 in the present embodiment does not indicate a spatial surface, but indicates only a functional portion that detects the magnetic flux density, i.e., a detection portion. Therefore, the detection surface 53 may alternatively be described as a "detection portion".
When a current flows through the conductive strip 30, a magnetic field is generated around the conductive strip 30 according to the magnitude of the current. The magnetic detecting element 52 detects the magnetic flux density of the magnetic flux in such a magnetic field. As shown in fig. 3 to 5, the three magnetoelectric conversion units 20 are arranged in a state in which the detection surface 53 faces each of the orthogonal portions 36 of the concave portion 35. Specifically, the three magnetoelectric conversion units 20 are respectively arranged so that distances from each of the two detection surfaces 53 to the orthogonal portion 35 where the detection surface 53 is opposed are equal to each other in a state where the two detection surfaces 53 are arranged along the 1 st direction. For example, when a current flows in the direction shown by the arrow in fig. 9 in the conductive strip 30, a magnetic flux in the direction shown by the broken line is generated on the orthogonal portion 36 opposing the magneto-electric converting unit 20. Therefore, a magnetic flux in a direction from the perpendicular portion 36 toward the detection surface 53 of one magnetic detection element 52 of the two magnetic detection elements 52 is input to the detection surface 53, and a magnetic flux in a direction from the detection surface 53 toward the perpendicular portion 36 is input to the detection surface 53 of the other magnetic detection element 52 of the two magnetic detection elements 52.
Of the magnetic fluxes input to the detection surfaces 53 of the two magnetic detection elements 52, the two magnetic detection elements 52 detect the magnetic flux density of the orthogonal component of the orthogonal detection surface 53. That is, the two magnetic detection elements 52 detect the magnetic flux density of the magnetic flux in the direction along the Y direction in fig. 9.
In the present embodiment, as shown in fig. 9, the directions of the orthogonal components of the magnetic fluxes input to the detection surfaces 53 of the two magnetic detection elements 52 are opposite to each other. Therefore, the magnetoelectric conversion unit 20 is configured to be able to output a signal corresponding to a difference in magnetic flux density between the orthogonal components of the magnetic flux input to the two detection surfaces 53. Specifically, as shown in fig. 10, two magnetic detection elements 52 are connected to the magneto-electric conversion unit 20. That is, the detection results of the two magnetic detection elements 52 are input to the inverting terminal and the non-inverting terminal of the amplifier AMP1, and signals corresponding to the differential magnetic fluxes are detected. Further, the signal corresponding to the differential magnetic flux is amplified by the amplifier AMP2 of the next stage and output as a signal of the magneto-electric converting unit 20. Thereby, the magneto-electric conversion unit 20 can detect the magnetic flux density of the magnetic flux caused by the current flowing through the orthogonal portion 36.
In the present embodiment, the magneto-electric conversion units 20 are each provided in a state in which the detection surface 53 is offset toward the orthogonal portion 36 side from the central portion in the direction along the 2 nd direction of the concave portion 35. The detection surface 53 is a surface to which a magnetic flux corresponding to the magnetic flux density of the detection target of the magnetic detection element 52 mounted on the magnetoelectric conversion unit 20 is input. The central portion along the 2 nd direction of the concave portion 35 is the Y-direction central portion of the concave portion 35, and corresponds to the central portion between a pair of orthogonal portions 36 having the concave portion 35 and facing each other. In the present embodiment, since one concave portion 35 has a pair of orthogonal portions 36, a state of being shifted toward the orthogonal portion 36 side means a state of being closer to one of the pair of orthogonal portions 36.
In the present embodiment, if the orthogonal portion 36 above the paper surface is set to one side and the orthogonal portion 36 below the paper surface is set to the other side in the three concave portions 35 shown in fig. 5, the magnetoelectric conversion unit 21 (two detection surfaces 53) is provided on the 1 st conductive strip 31 so as to be opposed to the orthogonal portion 36 on one side in a state of being shifted toward the orthogonal portion 36 on the one side. Further, on the 2 nd conductive strip 32, the magneto-electric converting unit 22 (two detection surfaces 53) is disposed opposite to the orthogonal portion 36 on the other side in a state of being shifted to the orthogonal portion 36 side on the other side. On the 3 rd conductive strip 33, the magneto-electric converting unit 23 (two detection faces 53) is disposed opposite to the orthogonal portion 36 on one side in a state of being shifted to the orthogonal portion 36 side on that side.
In addition, the magneto-electric conversion unit 20 provided in one of the concave portions 35 of two conductive strips 30 adjacent to each other is provided at an extended line position along the 1 st direction from the central portion of the other concave portion 35 of the two conductive strips 30. The magnetoelectric conversion unit 20 provided in the other of the concave portions 35 of two conductive strips 30 adjacent to each other is provided at a position of an extension line from the central portion of the one of the concave portions 35 of the two conductive strips 30 along the 1 st direction. Here, the two conductive strips 30 adjacent to each other refer to two conductive strips 30 of 1 st conductive strip 31 and 2 nd conductive strip 32, and two conductive strips 30 of 2 nd conductive strip 32 and 3 rd conductive strip 33.
Therefore, if two conductive strips 30 adjacent to each other are set as the 1 st conductive strip 31 and the 2 nd conductive strip 32, as shown in fig. 5, the magneto-electric conversion unit 21 provided on the concave portion 35a of the 1 st conductive strip 31 is provided at a position on an extension line C2 in the X direction from the center portion in the Y direction of the concave portion 35b of the 2 nd conductive strip 32, and the magneto-electric conversion unit 22 provided on the concave portion 35b of the 2 nd conductive strip 32 is provided at a position on an extension line C1 in the X direction from the center portion in the Y direction of the concave portion 35a of the 1 st conductive strip 31.
Similarly, if two conductive strips 30 adjacent to each other are set as the 2 nd conductive strip 32 and the 3 rd conductive strip 33, the magneto-electric conversion unit 22 provided on the concave portion 35b of the 2 nd conductive strip 32 is provided at a position on an extension line C3 in the X direction from the center portion in the Y direction of the concave portion 35C of the 3 rd conductive strip 33, and the magneto-electric conversion unit 23 provided on the concave portion 35C of the 3 rd conductive strip 33 is provided at a position on an extension line C2 in the X direction from the center portion in the Y direction of the concave portion 35b of the 2 nd conductive strip 32.
Therefore, in the present embodiment, as shown in fig. 5, in a state where the 1 st conductive strip 31 and the 3 rd conductive strip 33 are arranged in parallel along the Y direction, the magnetic-electric conversion units 21 provided on the concave portions 35 of the 1 st conductive strip 31 and the magnetic-electric conversion units 23 provided on the concave portions 35 of the 3 rd conductive strip 33 are arranged in a row along the X direction. As a result, as shown in fig. 5, when viewed in the 1 st direction (X direction), concave portion 35b of 2 nd conductive strip 32 and concave portion 35c of 3 rd conductive strip 33 are shifted toward the 2 nd direction (Y direction), and concave portion 35a of 1 st conductive strip 31 and concave portion 35c of 3 rd conductive strip 33 overlap.
In the present embodiment, for example, since each of the detection surfaces 53 of the two magnetic detection elements 52 of the magneto-electric conversion unit 22 of the 2 nd conductive strip 32 is located on the extension line C1 that cancels the magnetic field generated respectively on the two orthogonal portions 36 of the 1 st conductive strip 31 that are opposite to each other, when the magneto-electric conversion unit 22 measures the current value of the current flowing through the 2 nd conductive strip 32, it is not affected by the magnetic field generated by the 1 st conductive strip 31. Likewise, the magnetoelectric conversion unit 21 is not affected by the magnetic field generated by the 2 nd conductive strip 32. Similarly, the magnetoelectric conversion unit 23 is not affected by the magnetic field generated by the 2 nd conductive strip 32, and the magnetoelectric conversion unit 22 is not affected by the magnetic field generated by the 3 rd conductive strip 33.
As shown in fig. 6 and 7, the power module case 10 has a partition portion 15 on the 1 st housing portion 11 side of the recess 13. The power module case 10 is configured such that the heat sink 4 can be disposed at least in the vicinity of the recess 13 of the outer bottom surface 14a of the bottom portion 14 on the side opposite to the side where the current sensor 2 is housed in the 2 nd housing portion 12. Specifically, the power module case 10 is configured such that the outer bottom surface 14a of the bottom portion 14 of the recess 13 and the outer side surface 15a of the partition portion 15 are flat and can be brought into close contact with the heat sink 4. It should be noted that in fig. 7, only the power module case 10 and the heat sink 4 in the current detection apparatus 100 are shown in a sectional view, and the substrate 60 is shown in a plan view.
In the current sensor 2, the conductive strip 30 generates heat due to the current flowing through the conductive strip 30. At this time, the magneto-electric conversion unit 20 located near the concave portion 35 of the conductive strip 30 is affected by the heat generated by the conductive strip 30, and the temperature of the magneto-electric conversion unit 20 may sometimes become high. Since the magneto-electric converting unit 20 has temperature characteristics, the output voltage thereof changes when the temperature becomes high, and therefore, there is a high necessity for a current detecting apparatus 100 capable of preventing the magneto-electric converting unit 20 from entering a high temperature state. In the structure of the present invention, the power module case 10 is configured such that the heat sink 4 can be disposed at least in the vicinity of the concave portion 13 on the outer bottom surface 14a of the bottom portion 14. With this configuration, the heat sink 4 can be easily disposed in close contact with the outer bottom surface 14a of the bottom portion 14 of the power module case 10. This makes it possible to reliably dissipate heat generated by the conductive strips 30 to the outside via the heat sink 4 attached to the power module case 10 from the concave portions 35 housed in the concave portions 13 of the power module 10, and eventually suppress a temperature rise of the magneto-electric conversion unit 20.
In the present embodiment, the current detection device 100 includes the heat sink 4, and the heat sink 4 is in close contact with the outer bottom surface 14a of the bottom portion 14 and the outer side surface 15a of the partition portion 15 in the range from the 1 st housing portion 11 to the 2 nd housing portion 12 in a plan view. According to this configuration, the heat generated from the power module 1 housed in the 1 st housing part 11 and the conductive strip 30 of the current sensor 2 housed in the 2 nd housing part can be efficiently dissipated to the outside through the heat sink 4. This realizes effective suppression of temperature rise in the magnetoelectric conversion units 20 of the power module 1 and the current sensor 2.
[ other embodiments ]
(1) In the above embodiment, the distances from the respective concave portions 35a, 35b, 35c of the plurality of conductive strips 30 provided in the current detection device 100 to the outer side surface 15a of the partition portion 15 of the power module case 10 are different. Specifically, as shown in fig. 7, in current sensor 2, concave portion 35b of the 2 nd conductive strip 32 among concave portions 35 provided respectively on three conductive strips 30 is provided closer to outer side surface 15a than concave portions 35a, 35c of the other conductive strips 31, 33. In this case, the conductive strips 31,33, which are farther from the outer side surface 15a of the partition 15 and the concave portions 35a, 35c, conduct less heat to the heat sink 4 than the 2 nd conductive strip 32. Therefore, it is not possible to sufficiently suppress the temperature rise of the magneto-electric conversion unit 20 located near the conductive strips 31,33 whose distance from the concave portions 35a, 35c to the outer side surface 15a of the partition portion 15 is long, due to the influence of heat generated by the conductor. Therefore, in the present embodiment, as shown in fig. 11, a structure is adopted in which the outer side surface 15a of the partition 15 is kept at a fixed distance from each of the concave portions 35a, 35b, 35c of the conductive strips 31 to 33. Specifically, the partitions 31,32, and 33 are formed in a concave-convex shape in a cross-sectional view. Thereby, the conductive strips 31,32,33 are able to conduct heat uniformly from the concave portions 35a, 35b, 35c to the heat sink 4. Finally, the current detection apparatus 100 can uniformly suppress the temperature rise of all the magnetoelectric conversion units 20 arranged on the substrate 60. It should be noted that in fig. 11, only the power module case 10 and the heat sink 4 in the current detection apparatus 100 are shown in a sectional view, and the substrate 60 is shown in a plan view.
(2) In the above embodiment, the example in which the number of the conductive strips 30 in the current sensor 2 is three is described, but two or four or more conductive strips 30 may be used. In either case, the current flowing through the conductive strip 30 can be detected without mounting a magnetic core.
(3) In the above embodiment, the example in which the magneto-electric conversion units 20 are respectively provided in the current sensor 2 in a state in which the detection surfaces 53 are offset toward the orthogonal portion 36 side from the central portion in the 2 nd direction of the concave portion 35 has been described, but the magneto-electric conversion units 20 may be respectively provided in a state in which the detection surfaces 53 are positioned in the central portion in the 2 nd direction of the concave portion 35.
(4) In the above embodiment, the example in which the magnetoelectric conversion units 20 provided in the one concave portion 35 of the two conductive strips 30 adjacent to each other in the current sensor 2 are provided at the extended line position along the 1 st direction from the central portion of the other concave portion 35 of the two conductive strips 30 adjacent to each other has been described, but the magnetoelectric conversion units 20 provided in the one concave portion 35 of the two conductive strips 30 adjacent to each other may be configured not to be provided at the extended line position along the 1 st direction from the central portion of the other concave portion 35 of the two conductive strips 30.
(5) In the above embodiment, the two magnetoelectric conversion units 20 provided in the concave portions 35 of the two conductive strips 30 adjacent to each other in the current sensor 2 are mounted on different surfaces of the same substrate 60, but the two magnetoelectric conversion units 20 provided in the concave portions 35 of the two conductive strips 30 adjacent to each other may be mounted on different substrates or may be mounted on the same surface of the same substrate 60.
(6) In the above embodiment, the example in which the at least two conductive strips 30 are three conductive strips connected to the three-phase motor in the current sensor 2 is described, but the at least two conductive strips 30 may be three or more conductive strips connected to the three-phase motor. In addition, in the case where the at least two conductive bars 30 are three conductive bars connected to the three-phase motor, the three conductive bar extensions 34 may not be aligned in the 1 st direction.
(7) In the above embodiment, the example in which the magneto-electric conversion unit 20 is mounted on the substrate 60 on the current sensor 2 is described, but a substrate on which a control IC for controlling the driving of a three-phase motor, a motor driver, or the like is mounted may be used in combination with the substrate 60.
(8) In the above embodiment, the current sensor 2 has been described as having an example in which the concave portion 35 has two corners on the bottom side opposite to the U-shaped opening portion when viewed from the X direction, but the concave portion 35 may have a U-shape in which the bottom 37 side is curved when viewed from the X direction.
(9) In the above embodiment, the example in which the two magnetic detection elements 52 are provided in the magneto-electric conversion unit 20 in the current sensor 2 has been described, but at least two magnetic detection elements 52 may be provided in the magneto-electric conversion unit 20. That is, three or more magnetic detection elements 52 may be provided on the magnetoelectric conversion unit 20. In this case, each of the magneto-electric converting units 20 can output a signal corresponding to a difference in magnetic flux density of orthogonal components of the detection surface 53 orthogonal to the magnetic flux input to the respective detection surfaces 53 of at least two magnetic detecting elements 52 (i.e., all of the magnetic detecting elements 52 provided at each of the magneto-electric converting units 20).
Industrial applicability
The utility model discloses can be used for detecting the current detection device who flows the electric current of conductor.
Description of the symbols
2: current sensor
4: heat radiator
10: power module box (casing)
11: the 1 st receiving part
12: 2 nd accommodating part
13: concave part
14: bottom part
14 a: outer bottom surface
15: partition part
15 a: outer side surface
20: magnetoelectric conversion unit
30: conducting bar (conductor)
34: extension part
35: concave part
36: orthogonal part
52: magnetic detection element
53: detection surface
60: substrate
63: terminal with a terminal body
100: and a current detection device.
Claims (5)
1. A current detecting device, comprising:
a case provided with a 1 st housing section that houses a power module and a 2 nd housing section that houses a current sensor at a position adjacent to the 1 st housing section; and
the current sensor is accommodated in the 2 nd accommodating part;
the current sensor is provided with at least two conductors and at least two magnetoelectric conversion units,
one end of the at least two conductors is electrically connected to the power module,
the at least two magnetoelectric conversion units are provided with at least two magnetic detection elements which have detection surfaces facing the same direction with respect to the conductor and are capable of detecting a magnetic flux density of a magnetic flux input to the detection surfaces, and output signals corresponding to a difference in the magnetic flux density of orthogonal components orthogonal to the detection surfaces of the magnetic flux input to the respective detection surfaces of the at least two magnetic detection elements,
the at least two conductors are each provided with an extending portion that extends in a 2 nd direction toward the 1 st receiving portion while being orthogonal to a 1 st direction that is an adjacent direction of the two conductors adjacent to each other, and a concave portion that has an orthogonal portion that extends in a 3 rd direction while being orthogonal to both the 1 st direction and the 2 nd direction, and that is concave in the 3 rd direction with respect to the extending portion,
the at least two magneto-electric conversion units are each disposed in a state where the detection surface faces the orthogonal portion of each of the concave portions,
the concave portion is disposed in a concave portion provided in the 2 nd housing portion.
2. The current detection device of claim 1,
the case is formed so that a heat sink can be disposed on an outer bottom surface of a bottom portion of the case opposite to a side where the current sensor is housed, at least in the vicinity of the recess.
3. The current detection device according to claim 1 or 2,
in the current sensor, the two magnetoelectric conversion units respectively provided in the concave portions of the two conductors adjacent to each other are mounted on different surfaces of one substrate,
the upper part of the 2 nd receiving part of the shell is opened,
terminals connected to the substrate extend toward the upper side of the housing.
4. The current detection device of claim 1,
in the current sensor, the concave portion of at least one of the concave portions provided in the at least two conductors is provided closer to the 1 st accommodation portion than the concave portions of the other conductors,
the housing has a partition portion at one side of the 1 st receiving portion in the recess,
the distance between the outer side surface of the partition portion and the concave portion of each of the at least two conductors is fixed.
5. The current sensing device of claim 1, further comprising:
and a heat sink spanning from the 1 st housing portion to the 2 nd housing portion in a plan view, wherein an outer bottom surface of a bottom portion of the case on a side opposite to a side where the current sensor is housed is in close contact with an outer side surface of the recess portion of the partition portion on the 1 st housing portion side.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020080619A JP2021173728A (en) | 2020-04-30 | 2020-04-30 | Current detector |
| JP2020-080619 | 2020-04-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214539763U true CN214539763U (en) | 2021-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120544071.3U Active CN214539763U (en) | 2020-04-30 | 2021-03-15 | Current detection device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2021173728A (en) |
| CN (1) | CN214539763U (en) |
| DE (1) | DE202021101496U1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023136126A1 (en) * | 2022-01-14 | 2023-07-20 | 株式会社アイシン | Electric current sensor device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5273487B2 (en) | 2010-11-05 | 2013-08-28 | 本田技研工業株式会社 | Power control unit |
| JP2018121418A (en) | 2017-01-24 | 2018-08-02 | 株式会社ケーヒン | Electric power conversion system |
-
2020
- 2020-04-30 JP JP2020080619A patent/JP2021173728A/en active Pending
-
2021
- 2021-03-15 CN CN202120544071.3U patent/CN214539763U/en active Active
- 2021-03-23 DE DE202021101496.2U patent/DE202021101496U1/en active Active
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| Publication number | Publication date |
|---|---|
| JP2021173728A (en) | 2021-11-01 |
| DE202021101496U1 (en) | 2021-06-17 |
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