JP2012047564A - Current detection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a current detection apparatus which detects a current flowing to a busbar, by improving a degree of integration of components rather than the prior arts.SOLUTION: In a housing 40, a magnetic substance core 10 is held in such an attitude that a gap portion 12 is positioned in a direction between a second direction that is a wire lead-out direction R1 orthogonal to a first direction with a hollow portion 11 as a criterion, and a third direction orthogonal to the first direction and the second direction when watched from the first direction that is a through-direction of a busbar in the hollow portion 11. Further, in the housing 40, a magnetic flux detection part 21 of a hole element 20 is held at a position of the gap portion 12 of the magnetic substance core 10 and moreover, a connector 51 is held at such a position that a connection part 51a is partially overlapped with a connecting terminal 22 of the hole element 20 in an attitude turning toward the wire lead-out direction R1 when watched from the third direction.

Description

  The present invention relates to a current detection device that detects a current flowing in a bus bar.

  A vehicle such as a hybrid vehicle or an electric vehicle is often equipped with a current detection device that detects a current flowing through a bus bar connected to a battery. As such a current detection device, a magnetic proportional current detection device or a magnetic balance current detection device may be employed.

  For example, as disclosed in Patent Document 1 and Patent Document 2, a magnetic proportional system or magnetic balance system current detection apparatus includes a magnetic core and a magnetoelectric conversion element (magnetic sensitive element). The magnetic core is a magnetic body formed in a series around both ends of the hollow portion through which the both ends face each other through a gap portion and the bus bar penetrates. That is, the magnetic core is formed in a ring shape together with the gap portion. The hollow portion of the magnetic body is a space (current detection space) through which a current to be detected passes.

  The magnetoelectric conversion element is disposed in the gap portion of the magnetic core, detects a magnetic flux that changes according to the current flowing through the bus bar disposed through the hollow portion, and outputs a detection signal of the magnetic flux as an electric signal. It is an element. As the magnetoelectric conversion element, a Hall element is usually adopted.

  FIG. 8 is a diagram illustrating an example of the arrangement of each component in the conventional current detection device 100. FIG. 8 shows the arrangement of each component when the current detection device 100 is viewed from the direction in which the current to be detected flows. As shown in FIG. 8, the current detection device 100 includes a magnetic core 10, a Hall element 20 that is a magnetoelectric conversion element, an electronic substrate 50, and a connector 51. In FIG. 8, the electronic substrate 50 is drawn with a virtual line (two-dot chain line).

  The magnetic core 10 surrounds the hollow portion 11 through which the bus bar 300 passes. In the Hall element 20, a magnetic flux detection unit 21 disposed in the gap portion 12 of the magnetic core 10 and a connection terminal 22 extending from the magnetic flux detection unit 21 are formed. The connector 51 is formed with a connection portion 51a to which a mating connector provided on an unillustrated electric wire is connected, and a connection pin 51b. The electronic board 50 is a printed wiring board on which the Hall element 20 and the connector 51 are mounted.

  Further, the electronic substrate 50 is provided with a circuit for electrically connecting the Hall element 20 connection terminals 22 and the connection pins 51 b of the connector 51. For example, the electronic board 50 amplifies the circuit that supplies power input from the outside via the electric wire and the connector 51 to the connection terminal of the Hall element 20, and the detection signal of the Hall element 20, and outputs the amplified signal. A circuit for outputting to the connection pin 51b of the connector 51 is provided. As a result, the current detection device 100 can output a current detection signal to the control unit through the connector-attached electric wire connected to the connector 51.

  In FIG. 8, the X-axis direction, the Y-axis direction, and the Z-axis direction are directions orthogonal to each other. Further, the X-axis direction is a direction in which a current to be detected flows, that is, a penetration direction of the bus bar 300 in the hollow portion 11 of the magnetic core 10. The Z-axis direction is a drawing direction R1 of the electric wire connected to the connector 51. As shown in FIG. 8, the drawing direction R1 of the electric wire that transmits the detection signal of the current detection device is often a direction (Z-axis direction) orthogonal to the longitudinal direction (X-axis direction) of the bus bar 300. . The electronic board 50 is disposed along a plane (YZ plane) orthogonal to the current direction, and the Hall element 20 mounted on the electronic board 50 has the longitudinal direction of the connection terminal 22 orthogonal to the electronic board 50. It is arranged with the posture to do.

  Moreover, as shown in Patent Document 1 and Patent Document 2, in the current detection device, the magnetic core, the bus bar, and the magnetoelectric conversion element may be held in a fixed positional relationship by the insulating component holding portion. Many. This component holding part is made of a member such as resin, and positions a plurality of components constituting the current detection device in a fixed positional relationship.

JP 2006-166528 A JP 2009-128116 A

  Incidentally, in current detection devices mounted on vehicles such as electric vehicles and hybrid vehicles, there is an increasing demand for downsizing of the devices. For this reason, the current detection device mounted on the vehicle is desired to be further downsized by narrowing the interval between the components constituting the bus bar and the current detection device.

  However, in the conventional current detection device 100, when the wire drawing direction R1 is a direction orthogonal to the current direction, the Hall element 20 and the connector 51 are routed from the bus bar 300 to the wire drawing direction R1 on the electronic board 50. Are arranged in a column at intervals along. Therefore, the conventional current detection device 100 has a problem that a useless empty space S0 is formed next to the connection terminal 22 of the Hall element 20 and a dimension in the wire drawing direction R1 is increased.

  Further, if the Hall element 20 is arranged on the path from the bus bar 30 toward the electric wire drawing direction R1, and the connector 51 is arranged on one side of the path, the connector 51 is arranged closer to the bus bar 30. The dimension in the wire drawing direction R1 can be reduced. However, in this case, the connector 51 protrudes in the Y-axis direction orthogonal to the current direction and the wire drawing direction R1, and the size of the current detection device in the Y-axis direction becomes large.

  It is an object of the present invention to reduce the size of a current detection device that detects a current flowing through a bus bar by increasing the degree of integration of components compared to the conventional device.

The current detection device according to the present invention includes the following components.
(1) The first component is a magnetic core formed in a series surrounding the periphery of a hollow portion through which a bus bar through which a current flows, with both ends opposed via a gap portion.
(2) The second component is a magnetoelectric conversion element that is formed with a magnetic flux detection unit and a connection terminal arranged in the gap part, and detects a magnetic flux that changes according to a current passing through the hollow part of the magnetic core. .
(3) A 3rd component is a connector in which the connection part to which the other party connector provided in the electric wire was connected was formed.
(4) The fourth component is an electronic board provided with a circuit for electrically connecting the connection terminal of the magnetoelectric transducer and the connector.
(5) The fifth component is a component holding unit that holds the magnetic core, the magnetic flux detecting unit of the magnetoelectric transducer, the connector, and the electronic board in a fixed positional relationship. Here, when the component holding part is viewed from the first direction that is the through-direction of the bus bar in the hollow part of the magnetic core, the component holding part has a wire that is orthogonal to the first direction with respect to the hollow part. The gap portion is held in a posture in which the gap portion is positioned in a fourth direction between the second direction that is the pull-out direction and the third direction orthogonal to the first direction and the second direction. Furthermore, the component holding part holds the magnetic flux detection part in the magnetoelectric conversion element at the position of the gap part of the magnetic core. Furthermore, the component holding unit holds the connector at a position where the connection portion faces the second direction and a part of the connector overlaps the connection terminal of the magnetoelectric conversion element when viewed from the third direction.

  In the current detection device according to the present invention, it is preferable that the magnetic core is formed in an annular shape together with the gap portion.

  In the following description, the first direction means the direction of penetration of the bus bar in the hollow portion of the magnetic core, that is, the direction in which the current to be detected flows. The second direction means the direction of drawing out the electric wire that is orthogonal to the first direction. The third direction means a direction orthogonal to both the first direction and the second direction.

  In the current detection device according to the present invention, the component holding portion has a fourth direction between the second direction and the third direction with respect to the hollow portion when the magnetic core is viewed from the first direction. Hold in a posture in which the gap portion is positioned in an oblique direction. Furthermore, the component holding unit holds the connector at a position where the connection portion faces the second direction and a part of the connector overlaps the connection terminal of the magnetoelectric conversion element when viewed from the third direction. That is, in the current detection device according to the present invention, the space adjacent to the connection terminal of the magnetoelectric conversion element in the third direction is effectively used as the connector placement space. Therefore, the current detection device according to the present invention is a device having the same size in the third direction and a smaller size in the second direction as compared with the conventional current detection device.

  Further, in the current detection device according to the present invention, it is considered that the direction in the fourth direction in which the gap portion and the magnetic flux detection portion of the magnetoelectric conversion element are arranged is adjusted according to the shape and size of the connector used. It is done. Even in such a case, if the magnetic core is formed in an annular shape together with the gap portion, it is possible to adjust the direction in the fourth direction while keeping the dimension in the third direction constant. It is.

It is a disassembled perspective view of the electric current detection apparatus 1 which concerns on embodiment of this invention. FIG. 3 is a three-side view of a current detection bus bar 30 provided in the current detection device 1. 1 is a plan view of a current detection device 1. FIG. 1 is a first cross-sectional view of a current detection device 1. FIG. 3 is a second cross-sectional view of the current detection device 1. FIG. The first cross-sectional view of the current detection device 1 is a diagram showing the arrangement positions of the Hall elements and connectors of the conventional current detection device. It is sectional drawing of 1 A of current detection apparatuses which concern on the application example of the current detection apparatus 1 which concerns on this invention. It is a figure which shows an example of arrangement | positioning of each component in the conventional electric current detection apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The following embodiment is an example embodying the present invention, and is not an example of limiting the technical scope of the present invention.

  First, the configuration of the current detection device 1 according to the embodiment of the present invention will be described with reference to FIGS. The current detection device 1 is a device that detects a current flowing through a bus bar that electrically connects a battery and a device such as a motor in a vehicle such as an electric vehicle or a hybrid vehicle. As shown in FIG. 1, the current detection device 1 includes a magnetic core 10, a Hall element 20, a current detection bus bar 30, a housing 40, and an electronic substrate 50.

<Magnetic core>
The magnetic core 10 is a magnetic body made of ferrite, silicon steel, or the like, and has both ends opposed to each other via a gap portion 12 of about several millimeters and a series of shapes surrounding the hollow portion 11. ing. That is, the magnetic core 10 is formed in an annular shape together with the narrow gap portion 12. The magnetic core 10 in this embodiment is formed in an annular shape that surrounds the circular hollow portion 11 together with the gap portion 12.

  As shown in FIGS. 1 and 4, both end portions of the magnetic core 10 pass through the center point of the gap portion 12 and are plane-symmetric with respect to a plane perpendicular to the direction of magnetic flux formed in the gap portion 12. It is formed into a shape.

<Hall element (magnetoelectric conversion element)>
The Hall element 20 is disposed in the gap portion 12 of the magnetic core 10, detects a magnetic flux that changes according to a current passing through the hollow portion 11 of the magnetic core 10, and outputs a magnetic flux detection signal as an electric signal. It is an example of a conversion element. In the Hall element 20, a magnetic flux detection unit 21 disposed in the gap portion 12 of the magnetic core 10 and a connection terminal 22 extending from the magnetic flux detection unit 21 are formed.

  The magnetic flux detection unit 21 of the Hall element 20 has a predetermined detection center point positioned at the center point of the gap portion 12 of the magnetic core 10, and the front and back surfaces of the magnetic flux detection portion 21 are formed in the gap portion 12. It arrange | positions so that it may orthogonally cross with respect to.

<Electronic board>
The electronic board 50 is a printed circuit board on which the Hall element 20 is mounted at the connection terminal 22 portion. In addition to the Hall element 20, a circuit that performs a process such as amplification on a magnetic flux detection signal output from the Hall element 20 and a connector 51 are mounted on the electronic substrate 50.

  The connector 51 is formed with a connection part 51 a to which a mating connector provided on an unillustrated electric wire is connected and a connection pin 51 b to be fixed to the electronic board 50. The connecting portion 51a of the connector 51 is arranged toward the electric wire drawing direction R1 provided with the mating connector connected thereto. The drawing direction R1 of the electric wire that transmits the detection signal of the current detection device 1 is the second direction orthogonal to the first direction (X-axis direction) in which the current detection bus bar 30 penetrates the hollow portion 11 of the magnetic core 10. (Z-axis direction). The electronic substrate 50 is disposed along a plane (YZ plane) orthogonal to the current direction, and the Hall element 20 mounted on the electronic substrate 50 is in a posture in which the longitudinal direction of the connection terminal 22 is orthogonal to the electronic substrate 50. It is arranged with.

  Further, the electronic substrate 50 is provided with a circuit for electrically connecting the Hall element 20 connection terminals 22 and the connection pins 51 b of the connector 51. For example, the electronic board 50 amplifies the circuit that supplies power input from the outside via the electric wire and the connector 51 to the connection terminal of the Hall element 20, and the detection signal of the Hall element 20, and outputs the amplified signal. A circuit for outputting to the connection pin 51b of the connector 51 is provided. Thereby, the current detection device 1 can output a current detection signal to an external circuit such as an electronic control unit through the electric wire with a connector connected to the connector 51.

<Bus bar for current detection>
The current detection bus bar 30 is a conductor made of a metal such as copper, and is a part of the bus bar that electrically connects the battery and the electrical equipment. That is, a current to be detected flows through the current detection bus bar 30. The current detection bus bar 30 is a member independent of the battery-side bus bar connected in advance to the battery and the device-side bus bar connected in advance to the electrical equipment. The current detection bus bar 30 is connected to other bus bars (battery-side bus bar and device-side bus bar) laid at both ends thereof in advance.

  In FIG. 2, which is a three-view diagram of the current detection bus bar 30, FIG. 2 (a) is a plan view, FIG. 2 (b) is a side view, and FIG. 2 (c) is a front view. In FIG. 2, the magnetic core 10 combined with the current detection bus bar 30 is indicated by a virtual line (two-dot chain line).

  As shown in FIGS. 1 and 2, the current detection bus bar 30 is made of a member in which both end portions of a rod-shaped conductor that penetrates the hollow portion 11 of the magnetic core 10 are processed. In the current detection bus bar 30, the processed both end portions are terminal portions 32 connected to the connection ends of the front and rear stages of the current transmission path. That is, the current detecting bus bar 30 is a member made of a conductor having a rod-like through portion 31 that occupies a certain range in the central portion and terminal portions 32 formed at both ends of the rod-like through portion 31.

  The penetration part 31 is a part that penetrates the hollow part 11 of the magnetic core 10 along the current passing direction. The current passing direction is the thickness direction of the magnetic core 10, the axial direction of the cylinder when the annular magnetic core 10 is regarded as a cylinder, and further on the surface formed by the annular magnetic core 10. It is also an orthogonal direction. In each figure, the current passing direction is described as the first direction (X-axis direction).

  The terminal part 32 in this embodiment is flat form. Moreover, the penetration part 31 in the bus bar 30 for electric current detection is formed in rod shapes, such as column shape or elliptical column shape, for example. In each figure, the width direction and the thickness direction of the flat terminal portion 32 are described as a third direction (Y-axis direction) and a second direction (Z-axis direction), respectively.

  The current detection bus bar 30 is a member having a structure in which a portion in a certain range at both ends of a rod-shaped metal member is crushed into a flat plate shape by pressing using a press machine or the like. At this time, at least one of both ends of the rod-shaped metal member is pressed into a flat plate shape after the rod-shaped metal member is inserted into the hollow portion 11 of the magnetic core 10.

  The metal member that is the basis of the current detection bus bar 30 shown in FIGS. 1 and 2 is a cylindrical member, and the through-hole 31 of the current detection bus bar 30 manufactured by processing both ends of the cylindrical metal member is It is cylindrical. In addition, it is also conceivable that the metal member that is the source of the current detection bus bar 30 has an elliptical bar shape with an elliptical cross section or a square bar shape with a rectangular cross section. Moreover, it is also conceivable that the bar-shaped metal member as a base has a bar shape whose cross section is a quadrangle or other polygons. However, it is desirable that the cross-sectional shape of the through portion 31 of the current detection bus bar 30 is similar to the contour shape of the hollow portion 11 of the magnetic core 10.

  In the current detection bus bar 30, the flat terminal portion 32 has a width larger than the diameter (maximum width) of the hollow portion 11. Therefore, the magnetic core 10 cannot be mounted on the through-hole 31 of the current detection bus bar 30 manufactured in advance. Accordingly, after a set of the magnetic core 10 and the current detection bus bar 30 penetrating through the hollow portion 11 of the magnetic core 10 is made, the current detection bus bar 30 is connected to the other bus bars in the front and rear stages. Connected. Therefore, the flat terminal portion 32 is formed with a through hole 32z for screwing, whereby the flat terminal portion 32 is connected to the other bus bars at the front and rear stages by screws.

<Case (component holding part)>
The housing 40 is made of an insulator, and is a member that holds the magnetic core 10, the magnetic flux detection unit 21 of the Hall element 20, the connector 51, the electronic substrate 50, and the current detection bus bar 30 in a fixed positional relationship. And a lid member 42 attached to the case 41 and the main body case 41. Each of the main body case 41 and the lid member 42 is an integrally molded member made of an insulating resin such as polyamide (PA), polypropylene (PP), or ABS resin. The housing 40 is an example of a component holding unit.

  The body case 41 is formed in a box shape having an opening, and the lid member 42 closes the opening of the body case 41 by being attached to the body case 41. The main body case 41 is formed with a first holding portion 43 and a second holding portion 44 that protrude on the inner surface thereof. The main body case 41 includes the first holding portion 43 and the second holding portion 44, the magnetic core 10, the current detection bus bar 30 penetrating the hollow portion 11, and the Hall element 20 disposed in the gap portion 12. Are held in a state where they are not in contact with each other.

  More specifically, the first holding portion 43 is fitted into the gap between the magnetic core 10 and the through portion 31 of the current detection bus bar 30 that penetrates the hollow portion 11, thereby detecting the current detection of the magnetic core 10. The bus bars 30 are held in a fixed positional relationship so that they do not contact each other. Further, the second holding portion 44 is fitted into a gap between the magnetic core 10 and the magnetic flux detection portion 21 of the Hall element 20 disposed in the gap portion 12. Accordingly, the second holding unit 44 holds the magnetic core 10 in a posture facing a predetermined direction, and the magnetic core 10 and the magnetic flux detection unit 21 of the Hall element 20 are in contact with each other. Do not hold in a certain positional relationship.

  The body case 41 and the lid member 42 are formed with slit holes 45 into which the terminal portions 32 at both ends of the current detection bus bar 30 are inserted from the inside to the outside. In the state where one terminal portion 32 of the current detection bus bar 30 penetrating through the hollow portion 11 of the magnetic core 10 is passed through the slit hole 45 of the main body case 41, the first holding portion 43 and the second holding portion 43 of the main body case 41. The holding unit 44 holds the magnetic core 10, the Hall element 20, and the current detection bus bar 30 in a fixed positional relationship without being in contact with each other.

  The lid member 42 is attached to the main body case 41 holding the magnetic core 10, the Hall element 20 and the current detection bus bar 30 so as to close the opening of the main body case 41 while sandwiching the electronic substrate 50. At that time, the other terminal portion 32 of the current detection bus bar 30 is passed from the inside to the outside with respect to the slit hole 45 of the lid member 42, and the electronic substrate 50 is sandwiched between the main body case 41 and the lid member 42. . In addition, a third holding portion 49 formed to protrude from the inner side surface of the side wall of the main body case 41 fits into the chipped portion 52 formed in the electronic substrate 50, and holds the electronic substrate 50 at a predetermined position.

  3 and 5 are a plan view and a cross-sectional view of the current detection device 1 in a state where the main body case 41 and the lid member 42 are combined. FIG. 5 is a cross-sectional view taken along the plane BB shown in FIG. As shown in FIGS. 3 and 5, the electronic substrate 50 is sandwiched between the main body case 41 and the lid member 42, and the third holding portion 49 is fitted into the chipped portion 52 of the electronic substrate 50, whereby the electronic substrate 50 and the connector 51 mounted thereon are held in a state of being fitted into a chipped portion 46 formed in the main body case 41.

  Furthermore, the main body case 41 and the lid member 42 are provided with lock mechanisms 47 and 48 that hold them in a combined state. The lock mechanisms 47 and 48 shown in FIG. 1 include a claw portion 47 formed to project from the side surface of the main body case 41 and an annular frame portion 48 formed on the side of the lid member 42. When the claw portion 47 of the main body case 41 is fitted into the hole formed by the frame portion 48 of the lid member 42, the main body case 41 and the lid member 42 are held in a state where they are combined. As described above, the housing 40 is an example of a component holding unit that holds the magnetic core 10, the magnetic flux detection unit 21 of the Hall element 20, the connector 51, and the electronic substrate 50 in a certain positional relationship.

  FIG. 4 is a cross-sectional view taken along the line AA shown in FIG. 3, that is, a cross-sectional view at the boundary surface between the electronic board 50 and the connector 51. In FIG. 4, the electronic substrate 50 is drawn with virtual lines (two-dot chain lines).

  As shown in FIG. 4, the housing 40 has the hollow portion 11 when the magnetic core 10 is viewed from the first direction (X-axis direction) by the first holding portion 43 and the second holding portion 44. As a reference, the wire is held in a posture positioned in the direction of an acute angle θ from the wire drawing direction R1. The direction of the angle of the acute angle θ is based on the hollow portion 11 as a second direction (Z-axis direction) that is the wire drawing direction R1, and a third direction (Y-axis direction) orthogonal to the first direction and the second direction. Direction (fourth direction). The acute angle θ is an angle within a range of about 40 ° to 60 °, for example. Further, as illustrated in FIG. 4, the housing 40 holds the magnetic flux detection unit 21 in the Hall element 20 at the position of the gap portion 12 of the magnetic core 10 by the second holding unit 44.

  As shown in FIGS. 4 and 5, the housing 40 has the connector 51 mounted on the electronic substrate 50 by the third holding portion 49, and the connection portion 51 a in the second direction (wire drawing direction R <b> 1). With the orientation facing, the portion of the connection pin 51b is held at a position overlapping the connection terminal 22 of the Hall element 20 when viewed from the third direction (Y-axis direction).

<Effect>
As described above, in the current detection device 1, the space adjacent to the connection terminal 22 of the Hall element 20 in the third direction (Y-axis direction) is effectively used as the arrangement space of the connection pin 51 b of the connector 51. The Therefore, the current detection device 1 is a device having the same size in the third direction (Y-axis direction) and a smaller size in the second direction (Z-axis direction) than the conventional current detection device.

  FIG. 6 is a diagram showing the arrangement positions of the Hall element 20 and the connector 51 of the conventional current detection device in the first cross-sectional view of the current detection device 1 shown in FIG. In FIG. 6, the first cross-sectional view of the current detection device 1 is indicated by a virtual line (two-dot chain line), and the Hall element 20 and the connector 51 of the conventional current detection device are indicated by a solid line and a hidden line (dashed line). . Moreover, in FIG. 6, the area | region of the difference with the area | region which the current detection apparatus 1 occupies in the area | region which the conventional current detection apparatus occupies is shown by hatching.

  As shown in FIG. 6, the current detection device 1 is configured such that the Hall element 20 and the connector 51 are spaced on the electronic board 50 along a path from the current detection bus bar 30 toward the second direction (wire drawing direction R1). The dimension in the second direction is significantly smaller than that of a conventional current detection device arranged in a vacant column.

  For example, when the diameter of the annular magnetic core 10 is about 18 millimeters and the dimension of the connector 51 in the second direction is about 15 millimeters, the dimension of the conventional current detection device in the second direction is at least about 34 millimeters. . On the other hand, under the same conditions, magnetic flux detection of the gap portion 12 and the Hall element 20 is performed in a direction of 50 ° (θ = 50 °) with respect to the direction from the center line 110 of the hollow portion 11 of the magnetic core 10 toward the wire drawing direction R1. In the current detection device 1 in which the section 21 is arranged, the dimension in the second direction (Z-axis direction) is suppressed to about 30 millimeters. As a result, the current detection device 1 is 10% or more smaller in volume than the conventional device.

  In the current detection device 1, the direction of the angle θ at which the gap portion 12 of the magnetic core 10 and the magnetic flux detection portion 21 of the Hall element 20 are arranged is adjusted according to the shape and size of the connector 51 used. It can be considered. In the current detection device 1, since the magnetic core 10 is formed in an annular shape together with the gap portion 12, the direction of the angle θ is adjusted while maintaining the dimension in the third direction (Y-axis direction) constant. Is possible.

<Application example>
Hereinafter, a current detection device 1A according to an application example of the current detection device 1 according to the present invention will be described with reference to FIG. FIG. 7 is a cross-sectional view of the current detection device 1A and corresponds to the cross-sectional view of the current detection device 1 shown in FIG. In FIG. 7, the same components as those shown in FIGS. 1 to 5 are given the same reference numerals. Hereinafter, only the difference of the current detection device 1A from the current detection device 1 will be described.

  Compared with the current detection device 1 shown in FIGS. 1 to 5, the current detection device 1 </ b> A has a current detection bus bar 30, a magnetic core 10, and a housing 40 that are different in shape from the current detection bus bar 30 </ b> A. The magnetic core 10A and the housing 40A are replaced. The magnetic core 10A is not an annular shape, but has a shape in which both end portions facing each other with the gap portion 12 therebetween are formed in an irregular shape with respect to a rectangular annular shape. Moreover, the part which penetrates the hollow part 11 of the magnetic body core 10 in 30 A of bus bars for electric current detection is prismatic shape or plate shape.

  Both end portions of the magnetic core 10 </ b> A are also formed in plane symmetry with respect to a plane that passes through the center point of the gap portion 12 and is perpendicular to the direction of the magnetic flux formed in the gap portion 12.

  As shown in FIG. 7, the housing 40A of the current detection device 1A has the first holding portion 43A and the second holding portion 44A when the magnetic core 10A is viewed from the first direction (X-axis direction). With the hollow portion 11 as a reference, the hollow portion 11 is held in a posture positioned in a direction of an acute angle θ from the wire drawing direction R1. The acute angle θ is an angle within a range of about 40 ° to 60 °, for example. Further, as shown in FIG. 7, the housing 40A holds the magnetic flux detection part 21 in the Hall element 20 at the position of the gap part 12 of the magnetic core 10A by the second holding part 44A.

  Further, as shown in FIG. 7, the housing 40 </ b> A is configured such that the connector 51 mounted on the electronic substrate 50 is positioned by the third holding portion 49 </ b> A so that the connection portion 51 a faces the second direction (wire drawing direction R <b> 1). The portion of the connection pin 51b is held at a position where it overlaps the connection terminal 22 of the Hall element 20 when viewed from the third direction (Y-axis direction).

  The current detection device 1 </ b> A shown in FIG. 7 also has the same operations and effects as the current detection device 1. However, the magnetic core 10 </ b> A in the current detection device 1 </ b> A is not in an annular shape together with the gap portion 12. Therefore, in the current detection device 1A, in order to adjust the direction of the angle θ while keeping the dimension in the third direction (Y-axis direction) constant, a magnetic material having a shape corresponding to the angle θ for each angle θ. The core 10 needs to be prepared.

DESCRIPTION OF SYMBOLS 1,1A Current detection apparatus 10,10A Magnetic body core 11 Hollow part 12 Gap part 20 Hall element 21 Magnetic flux detection part 22 Connection terminal 30, 30A Current detection bus bar 31 Through part 32 Terminal part 32Z Through hole 40, 40A Case 41 Main body case 42 Lid member 43, 43A First holding portion 44, 44A Second holding portion 45 Slit hole 46 Notch portion 47 Claw portion (lock mechanism)
48 Frame (locking mechanism)
49, 40A 3rd holding | maintenance part 50 Electronic board 51 Connector 51a Connection part 51b Connection pin 52 Chipping part R1 Wire drawing direction

Claims (2)

Magnetic cores formed in a series around the periphery of the hollow portion through which the both ends face each other through the gap and the bus bar through which current flows passes,
A magnetic field detection element and a connection terminal arranged in the gap part, and a magnetoelectric conversion element that detects a magnetic flux that changes according to a current passing through the hollow part of the magnetic core;
A connector formed with a connecting portion to which a mating connector provided on the electric wire is connected;
An electronic board provided with a circuit for electrically connecting the connection terminal of the magnetoelectric conversion element and the connector;
A current detection device comprising: the magnetic core, the magnetic flux detection unit of the magnetoelectric conversion element, a component holding unit that holds the connector and the electronic substrate in a fixed positional relationship,
The component holder is
When the magnetic core is viewed from a first direction that is a through direction of the bus bar in the hollow portion of the magnetic core, the electric wire is drawn out perpendicular to the first direction with respect to the hollow portion. Holding the posture in which the gap portion is positioned in a fourth direction between a second direction that is a direction and a third direction orthogonal to the first direction and the second direction;
Holding the magnetic flux detection part in the magnetoelectric conversion element at the position of the gap part of the magnetic core;
The current detection device characterized in that the connector is held in a position where the connection portion faces the second direction and a part of the connector overlaps the connection terminal of the magnetoelectric transducer as viewed from the third direction. .   The current detection device according to claim 1, wherein the magnetic core is formed in an annular shape together with the gap portion.

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