JP2012058080A - Current detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly accurately position both ends of a magnetic core and a magnetoelectric transducer in a current detection device detecting a current flowing through a bus bar, and thus, to miniaturize the device and stabilize current detection sensitivity.SOLUTION: The current detection device 1 has an insulated housing 40 composed of a body case 41 and a lid member 42. The body case 41 holds a magnetic core 10 and a Hall element 20 by clamping them from both sides in a current passing direction in a hollow part 11 of the magnetic core 10. On the inner face of the body case 41, a positioning part 44 formed in a series to surround the Hall element 20 arranged in a gap part 12 of the magnetic core 10 is projectingly formed. The inner face of the positioning part 44 is fitted to the outer face of the Hall element 20, and a projection part 441 of the outer face is fitted to a groove part 13 on both ends of the magnetic core 10 and, thus, the positioning part 44 positions the magnetic core 10 and the Hall element 20 in a constant positional relation.

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, a magnetic proportional type or magnetic balance type current detection device includes a magnetic core and a magnetoelectric conversion element (magnetic sensitive element). The magnetic core is a generally ring-shaped magnetic body formed in a series surrounding both sides of a hollow portion where both ends face each other through a gap portion and the bus bar passes therethrough. 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.

  By the way, in the current detection device, when the position of the magnetoelectric conversion element with respect to both ends of the magnetic core is deviated from the ideal position, the current detection sensitivity changes greatly. On the other hand, in the current detection device, the smaller the cross-section of the magnetic core, that is, the smaller the projected area of both end faces of the magnetic core, the more the current detection sensitivity varies depending on the position error of the magnetoelectric transducer with respect to the magnetic core. Becomes prominent. For this reason, in the current detection device, it is important to position both ends of the magnetic core and the magnetoelectric conversion element with high accuracy in order to achieve both miniaturization of the device and stabilization of quality.

  As shown in Patent Document 1, in a current detection device, a magnetic core, a bus bar, and a magnetoelectric conversion element are often held in a fixed positional relationship by an insulating casing. This housing positions a plurality of components constituting the current detection device in a fixed positional relationship. Note that the casing is generally made of an insulating resin member.

  In a conventional current detection device, a first support part for positioning a magnetic core and a second support part for positioning a magnetoelectric conversion element are individually provided in a casing. For example, in the current detection device disclosed in Patent Document 1, the first support portion is a portion formed along each of the outer peripheral surface and the inner peripheral surface of the magnetic core in the housing. The second support part is a part that accommodates the magnetoelectric conversion element in the gap part of the magnetic core.

JP 2009-128116 A

  As described above, in the conventional current detection device, the magnetic core and the magnetoelectric conversion element are individually positioned by the plurality of support portions formed in the casing. For this reason, in the conventional current detection device, the dimensional tolerance between the support portions at a plurality of locations in the casing directly affects the positioning accuracy between the magnetic core and the magnetoelectric transducer, and causes variation in current detection sensitivity. Has a problem. This problem becomes more conspicuous when a magnetic core having a small cross section is adopted for miniaturization of the apparatus. In other words, it can be said that the conventional current detection device has a problem that the device cannot be sufficiently miniaturized by adopting a small magnetic core in order to suppress variation in current detection sensitivity.

  The present invention, in a current detection device for detecting a current flowing in a bus bar, positions both ends of a magnetic core and a magnetoelectric conversion element with high accuracy, thereby achieving both miniaturization of the device and stabilization of current detection sensitivity. The purpose is to do.

A current detection device according to the present invention is a current detection device that detects a current flowing through a bus bar, and includes the following components.
(1) The first component is a magnetic core that is formed in a series with both ends facing each other via a gap portion and surrounding the periphery of the hollow portion.
(2) A 2nd component is a magnetoelectric conversion element which is arrange | positioned at the gap part of a magnetic body core, and detects the magnetic flux which changes according to the electric current which passes the hollow part of a magnetic body core.
(3) The third component is formed in a series surrounding the periphery of the magnetoelectric conversion element arranged in the gap portion of the magnetic core, and the inner surface thereof is fitted with the outer surface of the magnetoelectric conversion element. The outer surface is a positioning unit that positions the magnetic core and the magnetoelectric conversion element in a fixed positional relationship by fitting with both ends of the magnetic core.

  Further, in the current detection device according to the present invention, it is more preferable if a protrusion and a groove that fit each other are formed on one and the other of the outer surface of the positioning portion and both ends of the magnetic core. It is.

  Further, in the current detection device according to the present invention, when viewed from the direction of current passage through the hollow portion of the magnetic core, the top portion of the protruding portion and the bottom portion of the groove portion are connected to both ends of the magnetic core. It is conceivable that it is formed at the center position in the width direction of the part.

  Further, the current detection device according to the present invention includes two members that sandwich and hold the magnetic core and the magnetoelectric conversion element from both sides in the direction of current passage in the hollow portion of the magnetic core. It is conceivable to further include a casing formed with a positioning portion protruding from one of the two.

  In the current detection device according to the present invention, the magnetic core and the magnetoelectric conversion element are positioned by the inner side surface and the outer side surface of one positioning portion formed in a series surrounding the periphery of the magnetoelectric conversion element. Therefore, an error in the positional relationship between the magnetic core and the magnetoelectric conversion element is caused only by the dimensional tolerance of the thickness of one positioning portion. In general, in a molded member, the dimensional tolerance of the thickness of one part is sufficiently smaller than the dimensional tolerance of the positions of a plurality of spaced parts.

  Therefore, the current detection device according to the present invention has higher positioning accuracy of the magnetic core and the magnetoelectric conversion element than the conventional current detection device in which the magnetic core and the magnetoelectric conversion element are positioned by a plurality of support portions. . As a result, it is possible to achieve both downsizing of the current detection device by adopting a small magnetic core and stabilization of current detection sensitivity.

  Further, in the present invention, it is preferable that a protrusion and a groove that fit each other are formed on one and the other of the outer surface of the positioning portion and both ends of the magnetic core. In this case, in the magnetic body core and the positioning portion, a portion that greatly affects the positioning accuracy is specified as a narrower portion including the protrusion and the groove. As a result, the positioning accuracy of the magnetic core and the magnetoelectric transducer can be further increased.

  By the way, in the current detection device, it is usually an ideal arrangement state that the detection center point of the magnetoelectric conversion element is located on a line connecting the centers of the projection surfaces of both opposing ends of the magnetic core. Therefore, if the magnetic core and the magnetoelectric conversion element are positioned with reference to the center positions in the width direction of both ends of the magnetic core, the magnetic core and the magnetoelectric conversion element are arranged in a state closer to the ideal arrangement state. Normally, the detection center point of the magnetoelectric conversion element is the center position of the main body of the magnetoelectric conversion element.

  Therefore, in the present invention, when viewed from the direction of current passage in the hollow portion of the magnetic core, the top of the protrusion and the bottom of the groove fit in the width direction of both ends of the magnetic core. It is suitable if it is formed at the center position. Thereby, a magnetic body core and a magnetoelectric conversion element are arranged in a state closer to an ideal arrangement state.

  Further, in the current detection device according to the present invention, if the magnetic core and the magnetoelectric conversion element are held by a casing made of two members sandwiching them from both sides in the current direction, the magnetic core and the magnetoelectric conversion element Positioning in the current direction is performed. Further, if the positioning portion is formed so as to protrude from one of the two members constituting the housing, the positioning portion performs positioning in the direction crossing the current direction. As a result, the positioning of the magnetic core and the magnetoelectric conversion element in the three-dimensional direction is preferable.

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. 2 is a front view of a main part of the current detection device 1. FIG. It is a front view of the principal part of 1 A of current detection apparatuses which concern on the application example of the current detection apparatus 1. FIG.

  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.

  Hereinafter, 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, an insulating 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. Moreover, the groove part 13 is formed in the both ends of the magnetic body core 10 in this embodiment. The role of the groove 13 will be described later.

<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. A connection terminal 21 for power input and output of a detection signal extends from the hall element 20.

  In the Hall element 20, a predetermined detection center point is positioned at the center point of the gap portion 12 of the magnetic core 10, and the front and back surfaces thereof are orthogonal to the direction of the magnetic flux formed in the gap portion 12. To be arranged. In the ideal arrangement state, the detection center point of the Hall element 20 is located on a line connecting the centers of the projection planes at the opposite ends of the magnetic core 10.

<Electronic board>
The electronic board 50 is a printed circuit board on which the Hall element 20 is mounted at the connection terminal 21 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 a component to which a mating connector provided on an electric wire (not shown) is connected. Further, the electronic board 50 is provided with a circuit for electrically connecting the Hall element 20 connection terminal 21 and the terminal of the connector 51. For example, the electronic substrate 50 amplifies the circuit that supplies power input from the outside via the electric wire and the connector 51 to the connection terminal 21 of the Hall element 20, and the detection signal of the Hall element 20, and the amplified signal Is output to the terminal of the connector 51. 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 member whose base material is a conductor member made of 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.

  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 indicated as the 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 Y-axis direction and a Z-axis direction, respectively.

  The base material of 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 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 width of the flat terminal portion 32 is formed to be larger than the diameter (maximum width) of the hollow portion 11 of the magnetic core 10. 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.

<Insulated housing>
The insulating casing 40 is an insulating member that holds the magnetic core 10, the current detection bus bar 30, and the electronic substrate 50 on which the Hall element 20 and the connector 51 are mounted in a fixed positional relationship. The insulating housing 40 includes two members: a main body case 41 and a lid member 42 attached to 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 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 positioning portion 44 that protrudes on the inner surface thereof. The main body case 41 holds the magnetic core 10 and the Hall element 20 disposed in the gap portion 12 in a fixed positional relationship by the positioning portion 44.

  Hereinafter, the positioning structure of the magnetic core 10 and the Hall element 20 by the positioning portion 44 will be described with reference to FIGS. 1 and 4. As shown in FIGS. 1 and 4, a positioning portion 44 that protrudes in the current passing direction (X-axis direction) is formed on the inner surface of the body case 41 that is one of the two members constituting the insulating housing 40. Is formed.

  The positioning portion 44 is formed in a series so as to surround the Hall element 20 disposed in the gap portion 12 of the magnetic core 10. The positioning portion 44 has an inner surface that fits with the outer surface of the Hall element 20, and an outer surface that fits with both end portions of the magnetic core 10, thereby connecting the magnetic body core 10 and the Hall element 20. Position in a certain positional relationship.

  In the present embodiment, projections 441 are formed on the outer surface of the positioning portion 44 so as to protrude toward both end portions of the magnetic core 10. On the other hand, groove portions 13 into which the protruding portions 441 of the positioning portion 44 are fitted are formed at both ends of the magnetic core 10. The protrusions 441 of the positioning portions 44 and the groove 13 at the end of the magnetic core 10 are fitted to each other, so that the magnetic core 10 is in a direction crossing the current passing direction (X-axis direction), that is, , Positioned in the YZ plane. Further, the inner surface of the positioning portion 44 is fitted with the outer surface of the Hall element 20, whereby the Hall element 20 is positioned in a direction intersecting the current passing direction (X-axis direction).

  That is, the inner surface of the positioning portion 44 is fitted to the outer surface of the Hall element 20, and the protrusion 441 of the positioning portion 44 and the groove 13 at the end of the magnetic core 10 are fitted to each other, thereby The core 10 and the Hall element 20 are held in a fixed positional relationship in a direction that intersects the current passage direction (X-axis direction).

  Further, when viewed from the current passing direction (X-axis direction), the top portion 441a of the protruding portion 441 and the bottom portion 13a of the groove portion 13 are the center positions in the width direction of both end portions of the magnetic core 10. Is formed. In FIG. 4, the width of both end portions of the magnetic core 10 is indicated by a symbol “W”.

  The positioning unit 44 is configured so that the detection center point of the Hall element 20 is positioned at the center position in the width direction of both end portions of the magnetic core 10 when viewed from the current passing direction (X-axis direction). The element 20 is held. For convenience, in FIG. 4, a slight gap is formed between the positioning portion 44, the end of the magnetic core 10, and the Hall element 20, but in reality, the gap is hardly formed.

  Further, the main body case 41 is formed with a restricting portion 43 along the outer peripheral surface of the magnetic core 10 on the inner surface thereof. The restricting portion 43 is a portion that restricts the magnetic core 10 from being largely displaced by contacting the outer peripheral surface of the magnetic core 10 when a force is applied to the magnetic core 10 due to vibration or the like. Therefore, the restricting portion 43 is formed with a slight gap with respect to the outer peripheral surface of the magnetic core 10. The magnetic core 10 is supported only by the positioning portion 44 in the normal state. On the other hand, the magnetic core 10 is basically supported by the positioning portion 44 and supplementarily supported by the restricting portion 43 when displaced by a force such as vibration.

  Further, a substrate support portion 49 is formed to protrude from the inner side surface of the side wall of the main body case 41. The substrate support portion 49 fits into the chipped portion 52 formed in the electronic substrate 50, and holds the electronic substrate 50 at a predetermined position.

  The main body case 41 and the lid member 42 are formed with slit holes 45 into which both terminal portions 32 of the current detection bus bar 30 are inserted from the inside to the outside. In the state in which 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 positioning portion 44 of the main body case 41 has the magnetic core 10 and the Hall element 20 are held.

  Further, the lid member 42 has the magnetic core 10, the Hall element 20, and the electronic substrate 50 including the connector 51 with respect to the body case 41 that holds the magnetic core 10, the Hall element 20, and the current detection bus bar 30. It is attached so as to close the opening of the main body case 41 while sandwiching. 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. Held.

  FIG. 3 is a plan view of the current detection device 1 in a state where the main body case 41 and the lid member 42 are combined. As shown in FIG. 3, the main body case 41 and the lid member 42 (insulating housing 40) are magnetic in a state where the terminal portion 32 of the current detection bus bar 30 and the connector 51 of the electronic board 50 are exposed to the outside. The body core 10, the Hall element 20, and the electronic substrate 50 are sandwiched and held in a fixed positional relationship. The magnetic core 10 and the Hall element 20 are sandwiched between the main body case 41 and the lid member 42, so that the positions in the current passing direction (X-axis direction) are maintained in a fixed positional relationship.

  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.

  In the current detection device 1 described above, the magnetic core 10 and the Hall element 20 are positioned by the inner side surface and the outer side surface of one positioning portion 44 that is formed in a series around the Hall element 20. Therefore, an error in the positional relationship between the magnetic core 10 and the Hall element 20 is caused only by a dimensional tolerance of the thickness of one positioning portion 44. In general, in a molded member, the dimensional tolerance of the thickness of one part is sufficiently smaller than the dimensional tolerance of the positions of a plurality of spaced parts.

  Therefore, the current detection device 1 has higher positioning accuracy of the magnetic core 10 and the Hall element 20 than the conventional current detection device in which the magnetic core 10 and the Hall element 20 are positioned by a plurality of support portions. As a result, it is possible to achieve both the downsizing of the apparatus by adopting the small magnetic core 10 and the stabilization of the current detection sensitivity.

  Further, in the current detection device 1, a projection portion 441 and a groove portion 13 which are fitted to each other are formed on one side and the other side of the outer surface of the positioning portion 44 and both ends of the magnetic core 10. Therefore, in the magnetic core 10 and the positioning portion 44, a portion that greatly affects the positioning accuracy is specified as a narrow portion including the protruding portion 441 and the groove portion 13. As a result, the positioning accuracy of the magnetic core 10 and the Hall element 20 is further increased.

  Further, in the current detection device 1, the top portion 441 a of the protrusion 441 and the bottom portion 13 a of the groove portion 13 that are fitted to each other are formed at the center position in the width direction of both end portions of the magnetic core 10. Thereby, if the projection part 441 and the groove part 13 fit, the detection center point of the Hall element 20 hold | maintained inside the positioning part 44 will be the high precision of the projection surface of the opposing both ends in the magnetic body core 10. FIG. Positioned on a line connecting the centers. Therefore, the magnetic core 10 and the Hall element 20 are arranged in a state closer to the ideal arrangement state.

  Further, in the current detection device 1, the magnetic core 10 and the Hall element 20 are positioned in the current passing direction (X-axis direction) by the body case 41 and the lid member 42 sandwiching them from both sides in the current passing direction. Positioning in a direction crossing the current passing direction is performed by 44. As a result, the magnetic core 10 and the Hall element 20 are positioned in the three-dimensional direction with high accuracy.

<Application example>
Next, a current detection device 1A according to an application example of the current detection device 1 described above will be described with reference to FIG. 1 A of this electric current detection apparatus has the structure from which only the shape of the positioning part 44 and the both ends of the magnetic body core 10 differ compared with the electric current detection apparatus 1 shown by FIGS. In FIG. 5, the same components as those shown in FIGS. 1 to 4 are denoted by the same reference numerals. Hereinafter, only the difference of the current detection device 1A from the current detection device 1 will be described.

  Flat end surfaces are formed at both ends of the magnetic core 10 in the current detection device 1A. Further, the positioning portion 44 in the current detection device 1A has a groove portion 442 into which the end portion of the magnetic core 10 is fitted on the outer surface thereof. In the current detection device 1 </ b> A, the end of the magnetic core 10 and the groove portion 442 outside the positioning portion 44 are fitted to each other, so that the magnetic core 10 intersects the current passing direction (X-axis direction). I.e., in the YZ plane.

  That is, in the current detection device 1A, the inner surface of the positioning portion 44 is fitted to the outer surface of the Hall element 20, and the groove portion 442 of the positioning portion 44 and the end portion of the magnetic core 10 are fitted to each other. The magnetic core 10 and the Hall element 20 are held in a fixed positional relationship in a direction that intersects the current passage direction (X-axis direction).

  Compared to the current detection device 1, the current detection device 1 </ b> A has a slightly wider range of parts that greatly affect the positioning accuracy in the magnetic core 10 and the positioning portion 44. However, the current detection device 1A has a higher positioning accuracy of the magnetic core 10 and the Hall element 20 than the conventional current detection device in which the magnetic core 10 and the Hall element 20 are positioned by a plurality of support portions. .

<Others>
The above-described current detection device 1 has a configuration in which the protruding portion 441 is formed in the positioning portion 44 and the groove portion 13 is formed at the end portion of the magnetic core 10, but the groove portion is formed in the positioning portion 44 and the magnetic core. It is also conceivable that a configuration in which a protruding portion that fits into the groove portion of the positioning portion 44 is formed at the end portion of 10 is adopted.

DESCRIPTION OF SYMBOLS 1,1A Current detection apparatus 10 Magnetic body core 11 Hollow part of magnetic body core 12 Gap part of magnetic body core 13 Groove part of edge part of magnetic body core 20 Hall element 21 Connection terminal 30 Current detection bus bar 31 Through part 32 Terminal part 32z Through hole 40 Insulating housing 41 Main body case 42 Lid member 43 Restricting part 44 Positioning part 441 Projection part of positioning part 442 Groove part of positioning part 45 Slit hole 47 Claw part (lock mechanism)
48 Frame (locking mechanism)
49 Substrate support part 50 Electronic board 51 Connector 52 Chip part of electronic board

Claims (4)

A current detection device for detecting a current flowing in a bus bar,
A magnetic core formed by a series of both ends facing each other through a gap portion and surrounding the periphery of the hollow portion;
A magnetoelectric conversion element that is disposed in the gap portion of the magnetic core and detects a magnetic flux that changes according to a current passing through the hollow portion of the magnetic core;
It is formed in a series surrounding the periphery of the magnetoelectric conversion element disposed in the gap portion of the magnetic core, and its inner surface is fitted to the outer surface of the magnetoelectric conversion element, and the outer surface is the magnetic A current detection device comprising: a positioning portion that positions the magnetic core and the magnetoelectric conversion element in a fixed positional relationship by fitting with both end portions of the body core.   2. The current detection device according to claim 1, wherein a protrusion and a groove that are fitted to each other are formed on one and the other of the outer surface of the positioning portion and both ends of the magnetic core.   When viewed from the direction of current passage through the hollow portion of the magnetic core, the top of the protrusion and the bottom of the groove that fit together are the centers in the width direction of both ends of the magnetic core. The current detection device according to claim 2, wherein the current detection device is formed at a position of   The magnetic core and the magnetoelectric conversion element are composed of two members that are sandwiched and held from both sides in the direction of current passage in the hollow portion of the magnetic core, and the positioning portion is provided on one of the two members. The current detection device according to claim 1, further comprising a housing formed to protrude.

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