WO2013153699A1

WO2013153699A1 - Electrical junction box and electrical current sensor

Info

Publication number: WO2013153699A1
Application number: PCT/JP2012/080857
Authority: WO
Inventors: 浩勝中嶋; 悟茶園
Original assignee: 住友電装株式会社
Priority date: 2012-04-12
Filing date: 2012-11-29
Publication date: 2013-10-17
Also published as: JP2013217866A

Abstract

The present invention reduces the space for an electrical current sensor and avoids complicating the work of assembling the electrical current sensor to an electrical junction box (1). An equipment support tool (40) supports a magnetic core (10) and a Hall element (20) at a constant positional relationship. The equipment support tool (40), which is penetrated by a bus bar (9), does not protrude out from an outer edge section of the magnetic core (10), except for a partial region from both ends of the magnetic core (10). A core support section (43) supports the magnetic core (10) while in contact with an inside surface thereof, and faces an inner edge section of the magnetic core (10) to limit displacement of the magnetic core (10). An element support section (44) supports the Hall element (20) inside a gap section (12) of the magnetic core (10). A circuit board (50) on which the Hall element (20) is mounted is fixed to a board fixing section (46) of the equipment support tool (40).

Description

Electrical junction box and current sensor

The present invention relates to a current sensor for measuring a current flowing through a bus bar and an electric junction box including the current sensor.

Vehicles such as hybrid vehicles or electric vehicles are often equipped with a current sensor that measures the current flowing through the bus bar connected to the battery. As such a current sensor, a magnetic proportional current sensor or a magnetic balance current sensor may be employed.

A magnetic proportional type or magnetic equilibrium type current sensor includes, for example, a magnetic core and a magnetoelectric conversion element as disclosed in

Patent Documents

1 and 2. 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 through which the 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.

In a magnetic current sensor, if the width of the gap portion of the magnetic core, that is, the distance between the both end faces of the magnetic core is too wide, the sensitivity of the current sensor measurement decreases. For this reason, both end surfaces of the magnetic core are formed to face each other via a relatively narrow gap portion, and the width of the gap portion of the magnetic core is narrower than the width of the hollow portion of the magnetic core.

In addition, as shown in

Patent Documents

1 and 2, the current sensor includes a non-conductive housing that houses necessary devices such as a magnetic core, a magnetoelectric conversion element, and a circuit board on which the magnetoelectric conversion element is mounted. Provided as an electrical component having a dustproof structure. The magnetic core and the magnetoelectric conversion element are supported in a fixed positional relationship by the casing. Note that the casing of the current sensor is generally made of a non-conductive resin member.

On the other hand, as shown in Patent Document 3, electrical components mounted on a vehicle are often attached to a vehicle as a unitized electrical connection box by being housed in a non-conductive casing together with a bus bar. The electrical components housed in the electrical junction box are, for example, a relay, a fuse, a current sensor, and the like.

JP 2004-101384 A JP 2009-128116 A JP 2009-38890 A

Recently, the demand for miniaturization of the electrical junction box mounted on the vehicle has become stricter, and accordingly, the demand for space saving of the current sensor accommodated in the electrical junction box has become more severe.

However, in the conventional current sensor, the entire device such as the magnetic core is covered with a casing having a certain thickness, and there is a gap between the device such as the magnetic core and the housing containing the device. It has a structure in which further space saving is difficult due to the occurrence.

On the other hand, if a plurality of devices constituting the current sensor are individually assembled in the electrical junction box, the current sensor can be saved in space, but the assembly operation of the appliance in the electrical junction box becomes complicated.

An object of the present invention is to provide a current sensor for measuring a current flowing through a bus bar in an electrical junction box, and to realize a space saving of the current sensor while avoiding the complicated work of assembling the current sensor to the electrical junction box. And

The electrical junction box according to the first aspect includes the components shown below.
(1) The first component is a bus bar.
(2) The second component is a current sensor that measures the current flowing through the bus bar. The current sensor includes a magnetic core, a magnetoelectric conversion element, a circuit board, and a device support shown below. The magnetic core is a member made of a magnetic material, formed in a series surrounding the periphery of the hollow portion through which the bus bar passes, and facing both ends through a gap portion having a width narrower than the width of the hollow portion. . The magnetoelectric conversion element is disposed in the gap portion of the magnetic core, and measures a magnetic flux that changes according to a current passing through the hollow portion of the magnetic core. The circuit board is a board on which a magnetoelectric conversion element is mounted. The device support is made of a non-conductive material and has a bus bar hole through which the bus bar penetrates, and is formed without protruding from the outer edge of the magnetic core except for a part of the region from both ends of the magnetic core. The magnetic core and the magnetoelectric conversion element are supported in a fixed positional relationship. Furthermore, the device support has a core support portion, an element support portion, and a substrate fixing portion described below. The core support portion penetrates the hollow portion of the magnetic core and is formed to face the inner edge of the magnetic core, supports the magnetic core in contact with the inner side surface, and displaces the magnetic core in the thickness direction. It is the part which restricts doing. The element support part is a part that supports the magnetoelectric conversion element in a state where the magnetic detection part is located in the gap part of the magnetic core. The board fixing part is a part to which the circuit board is fixed.
(3) A third component is a housing made of a non-conductive material and containing electrical components including a bus bar and a current sensor.

The electrical junction box according to the second aspect is an aspect of the electrical junction box according to the first aspect. In the electrical junction box according to the second aspect, the device support for the current sensor includes a first element member and a second element member. The first element member is a member formed of an integrally molded member and having a core support portion, an element support portion, and a substrate fixing portion. The second element member is formed of an integrally molded member, and the magnetic core supported by the core support portion in contact with both end faces of the magnetic core rotates in a plane perpendicular to the thickness direction of the magnetic core. It is a member that has a core rotation restricting part that restricts the first element member. Further, the portion of the core support portion that passes through the hollow portion of the magnetic core has a first direction that is a direction through which the bus bar hole passes and a position where the magnetic detection unit of the magnetoelectric conversion element is arranged from the center of the bus bar hole. In a third direction orthogonal to the second direction toward the center of the magnetic core, the magnetic core is formed with a width larger than the interval between both end faces of the magnetic core, and penetrates the hollow portion of the magnetic core in the core support portion. The portion to be formed is formed with a width smaller than the distance between both end faces of the magnetic core in a direction orthogonal to the first direction and intersecting the third direction.

The electrical junction box according to the third aspect is an aspect of the electrical junction box according to the second aspect. In the electrical junction box according to the third aspect, the inner surface of the magnetic core is an arcuate curved surface, and the both ends of the third direction of the portion of the core support portion that penetrates the hollow portion of the magnetic core. The surface is an arcuate curved surface along the inner surface of the magnetic core.

The electrical junction box according to the fourth aspect is an aspect of the electrical junction box according to any one of the first aspect to the third aspect. In the electrical junction box according to the fourth aspect, the core support portion of the current sensor forms a partition that partitions the bus bar hole and the gap portion of the magnetic core.

The electrical junction box according to the fifth aspect is an aspect of the electrical junction box according to the fourth aspect. In the electrical junction box according to the fifth aspect, the device support includes a gap lid portion that is formed with a through hole through which the lead terminal of the magnetoelectric conversion element passes and closes the opening on the outer peripheral side of the magnetic core in the gap portion of the magnetic core. It has further. Furthermore, the element support portion supports the magnetoelectric conversion element and closes the opening in the thickness direction of the magnetic core in the gap portion of the magnetic core.

The electrical junction box according to the sixth aspect is an aspect of the electrical junction box according to any of the first aspect to the fifth aspect. The electrical junction box according to the sixth aspect further includes a connector having a terminal electrically connected to the magnetoelectric conversion element in the circuit board and a non-conductive housing that surrounds the terminal and is fixed to the circuit board.

The electrical junction box according to the seventh aspect is an aspect of the electrical junction box according to any one of the first aspect to the fifth aspect. An electrical junction box according to a seventh aspect is a connector having a terminal electrically connected to a magnetoelectric conversion element on a circuit board, and a non-conductive housing that surrounds the terminal and is molded as a part of the housing Is further provided.

The electrical junction box according to the eighth aspect is an aspect of the electrical junction box according to any one of the first aspect to the seventh aspect. In the electrical junction box according to the eighth aspect, the bus bar has an outer peripheral surface formed in a shape along the surface around the bus bar hole in the equipment support tool, an intermediate part penetrating the bus bar hole, and a front stage and a rear stage connected to the intermediate part. A bar-shaped relay bus bar having both ends connected to another bus bar.

The current sensor according to the ninth aspect is a current sensor provided in the electrical junction box according to any of the aspects described above.

In the first to twelfth aspects, the magnetic core, the magnetoelectric conversion element, and the circuit board constituting the current sensor are united via the device support. Therefore, unlike the case where the devices constituting the current sensor are individually assembled in the electrical junction box, the assembly work of the current sensor to the electrical junction box is not complicated.

Furthermore, in the first to twelfth aspects, the device support for the current sensor is formed so as not to protrude from the outer edge of the magnetic core except for a part of the region from both ends of the magnetic core. In this case, the contour shape of the magnetic core becomes the contour shape of the current sensor at portions other than the vicinity of both ends of the magnetic core. Therefore, the current sensors in the first to twelfth aspects are compared with the conventional current sensor by the thickness of the housing that accommodates the magnetic core and the gap between the magnetic core and the housing. Space saving.

Incidentally, in a magnetic current sensor, in order to suppress variation in current detection sensitivity, it is important that the magnetic core and the magnetoelectric transducer are positioned with high accuracy. In order to improve the positioning accuracy between the magnetic core and the magnetoelectric conversion element, it is desirable that the magnetic core, the magnetoelectric conversion element, and the circuit board on which the magnetoelectric conversion element is mounted be supported by a small member formed integrally. . This is because, generally, a small member formed integrally has a smaller dimensional error than a member formed by a combination of a plurality of members and a large member.

In the second aspect, the magnetic core, the magnetoelectric conversion element, and the circuit board are supported by the integrally formed first element member, and the core support portion and the element support portion of the first element member include the magnetic core. It is formed in a relatively small region from the inner edge to both ends. Therefore, the magnetic core and the magnetoelectric conversion element are positioned with high accuracy, and variations in current detection sensitivity are suppressed.

Furthermore, as will be described later, according to the second aspect, after the portion of the support shaft that penetrates the hollow portion of the magnetic core in the core support portion is inserted into the hollow portion from the gap portion of the magnetic core, the magnetic body If the core is rotated until the gap portion faces in the second direction, the core support portion can appropriately support the magnetic core.

Furthermore, in the second aspect, if the first element member and the second element member are combined after the magnetic core has been rotated until the gap portion faces the second direction, the rotation of the second element member The rotation of the magnetic core is limited by the limiting portion, and the magnetic core is appropriately positioned.

In the third aspect, the inner surface of the magnetic core is an arc-shaped curved surface, and the surfaces of both end portions in the third direction of the support shaft portion are arc-shaped along the inner surface of the magnetic core. It is a curved surface. In this case, after the portion of the support shaft is inserted into the hollow portion from the gap portion of the magnetic core, the magnetic core can be smoothly rotated while sliding on the curved surface of the portion of the support shaft.

In the magnetic current sensor, when the magnetic core is formed in an annular shape together with the gap portion, that is, when the inner surface and the outer surface of the magnetic core are concentric arcuate curved surfaces Focus the magnetic flux most efficiently. Therefore, according to the third aspect, it is possible to employ a substantially annular magnetic core having high magnetic flux convergence efficiency.

Further, in the fourth aspect, the core support portion forms a partition that partitions the bus bar hole and the gap portion of the magnetic core. Therefore, the creepage distance between the bus bar penetrating the bus bar hole and the magnetoelectric conversion element disposed in the gap portion of the magnetic core becomes long, and the magnetoelectric conversion element is less likely to fail due to the surge voltage applied to the bus bar.

In the fifth aspect, the gap portion of the magnetic core in which the magnetoelectric conversion element is disposed has a core support portion, an element support portion, and a gap lid portion, except for a hole portion through which the lead terminal of the magnetoelectric conversion element passes. Is blocked from all sides. For this reason, air that is temporarily excessively heated due to heat generated by other electrical components in the electrical junction box is less likely to flow into the gap portion of the magnetic core where the magnetoelectric conversion element exists, and the ambient temperature of the magnetoelectric conversion element The fluctuation range of can be kept small. As a result, it is possible to avoid failure of the magnetoelectric conversion element that is relatively weak at high temperatures due to temporary excessive temperature rise of air in the electrical junction box.

Further, in the sixth aspect, the connector housing that relays the electrical connection between the magnetoelectric transducer and the other device is fixed to the circuit board. Therefore, when a connector connected to another device is attached to or detached from the connector of the current sensor, the external force applied to the connector housing does not act on the connection portion between the connector terminal and the circuit board, and the device support It is received by a circuit board fixed to the board. As a result, the connection portion between the connector terminal and the circuit board is prevented from being damaged by an external force applied to the connector housing.

In the seventh aspect, the connector housing that relays the electrical connection between the magnetoelectric transducer and the other device is formed as a part of the casing of the electrical junction box. In this case, the external force applied to the connector housing is received by the casing of the electrical junction box without acting on the connection portion between the connector terminal and the circuit board. As a result, the connection portion between the connector terminal and the circuit board is prevented from being damaged by an external force applied to the connector housing.

Further, in the eighth aspect, the relay bus bar that penetrates the bus bar hole of the current sensor is connected to another bus bar, so that it is small regardless of the width of a general flat bus bar attached to the electrical connection box. A magnetic core can be employed. Therefore, further space saving of the current sensor is possible.

In the eighth aspect, the intermediate portion of the relay bus bar penetrating the bus bar hole of the device support is formed in a shape along the surface around the bus bar hole, and the relay bus bar is almost between the device support and the device support. There is no gap. Therefore, even when a small magnetic core is used, the relay busbar is made as thick as possible so that it can be inserted into the busbar hole, so that the electrical resistance of the relay busbar is kept small, and the relay busbar generates excessive heat due to current. Is prevented.

It is a perspective view of the electric junction box 2 concerning a 1st embodiment of the present invention. 1 is an exploded perspective view of a current sensor 1 according to a first embodiment of the present invention. 1 is a perspective view of a current sensor 1. FIG. It is the side view and back view of the current sensor 1. It is a perspective view which shows the process in which a magnetic body core is attached to an apparatus support in the assembly process of the current sensor 1. 2 is an exploded cross-sectional view of a basic unit 1x that constitutes a current sensor 1. FIG. It is a disassembled perspective view of the basic unit 1x which comprises the current sensor 1. FIG. It is a perspective view of the basic unit 1x which comprises the current sensor 1. FIG. 2 is a cross-sectional view of a basic unit 1x that constitutes a current sensor 1. FIG. 2 is an exploded perspective view of a portion of a current sensor 1 in an electrical junction box 2. FIG. FIG. 3 is a first perspective view of a current sensor portion in the electrical junction box 2. It is a 2nd perspective view of the part of the current sensor in the electrical junction box. It is a disassembled perspective view of the part of the current sensor in the electrical junction box 2A according to the second embodiment of the present invention. It is a perspective view of the part of the current sensor in electrical junction box 2A.

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, a schematic configuration of the electrical junction box 2 according to the first embodiment of the present invention will be described with reference to FIG.

<Schematic configuration of electrical junction box>
The electrical junction box 2 is an electrical unit attached to a vehicle such as an electric vehicle or a hybrid vehicle. As shown in FIG. 1, the electrical junction box 2 includes a current sensor 1 and other electrical components 6, a bus bar 9 connected to the electrical component 6, and a housing that houses the current sensor 1, electrical component 6, and bus bar 9. 8.

Note that FIG. 1 shows the housing 8 in a state where the main body container and the lid that closes the opening thereof are separated, and a part of the housing 8 is not shown. Moreover, in FIG. 1, the housing | casing 2 and the electrical component 6 are drawn simply.

The current sensor 1 and other electrical components 6 are attached to the vehicle as a unitized electrical connection box 2 by being housed in a non-conductive casing 8 together with the bus bar 9. The current sensor 1 accommodated in the electrical junction box 2 is a magnetic current sensor. Moreover, the other electrical components 6 accommodated in the electrical junction box 2 are a relay, a fuse, etc., for example.

The casing 8 of the electrical junction box 2 is a molded member made of non-conductive resin such as polyamide (PA), polypropylene (PP), polybutylene terephthalate (PBT), or ABS resin.

The current sensor 1 is a sensor that measures a current flowing through a bus bar 9 that electrically connects a battery and a device such as a motor, for example. As shown in FIG. 1, the current sensor 1 includes a magnetic core 10, a hall element 20, a relay bus bar 30, a device support 40, and a circuit board 50.

<Current sensor>
Next, the configuration of the current sensor 1 according to the first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 2, the current sensor 1 includes a magnetic core 10, a Hall element 20, a circuit board 50, a connector 51, and a device support 40.

<Magnetic core>
The magnetic core 10 is a member (magnetic body) made of a magnetic material such as permalloy, ferrite, or silicon steel. The magnetic core 10 is a member formed by sintering powder made of a magnetic material, for example. Such a magnetic core 10 was solidified and molded by compressing a solid powder assembly made of a magnetic material in a mold and further heating it at a temperature lower than the melting point of the magnetic material. It is a member. Alternatively, the magnetic core 10 may be a laminated type magnetic core in which a plurality of thin plates are laminated and bonded.

Further, the magnetic core 10 has a shape formed so as to surround both ends of the hollow portion 11 through which the both ends of the magnetic core 10 face each other through a gap portion 12 of about several millimeters. 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 surrounding the circular hollow portion 11 together with the gap portion 12. Therefore, the inner side surface and the outer side surface of the magnetic core 10 are concentric arcuate curved surfaces, respectively. As shown in FIG. 6, the magnetic core 10 is formed in a shape in which both end faces thereof are opposed to each other with a gap portion 12 having a width D2 narrower than the width D1 of the hollow portion 11. The width D <b> 2 of the gap portion 12 means the interval between both end faces of the magnetic core 10.

<Hall element (magnetoelectric conversion element)>
The Hall element 20 is disposed in the gap portion 12 of the magnetic core 10, measures 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 measurement signal as an electric signal. It is an example of a conversion element. The Hall element 20 includes a magnetic detection unit 21 and a lead terminal 22.

The magnetism detection unit 21 is a main body of an element that is arranged in the magnetic flux path and detects magnetism. The lead terminal 22 is a conductor formed to extend from the magnetic detection unit 21 and includes a power input terminal and a detection signal output terminal. The detection signal output from the Hall element 20 is input to a control unit (not shown) provided separately from the current sensor 1.

The Hall element 20 has a predetermined detection center point of the magnetic detection unit 21 located on a line connecting the centers of projection surfaces of both opposing ends of the magnetic core 10, and the front and back surfaces of the Hall element 20 are in the gap portion 12. It arrange | positions so that it may orthogonally cross with respect to the direction of the magnetic flux formed. The detection center point of the magnetic detection unit 21 is usually located substantially at the center of the magnetic detection unit 21.

In the example shown in FIG. 2, the current sensor 1 includes one Hall element 20. However, the current sensor 1 may include two Hall elements 20 in some cases. In this case, the two Hall elements 20 are arranged in the gap portion 12 of the magnetic core 10 in a state where the respective magnetic detection portions 21 overlap. And the control part which input the detection signal which each of the two Hall elements 20 outputs determines whether abnormality occurred in either one of the two Hall elements 20 by comparing the two detection signals.

<Circuit board>
The circuit board 50 is mounted with a lead terminal 22 of the Hall element 20, a circuit electrically connected to the lead terminal 22, and a terminal 511 of a connector 51 that relays the connection between the circuit and an external control unit. Substrate. Therefore, the circuit board 50 has a mounting hole 501 into which the lead terminal 22 of the hall element 20 is inserted and a mounting hole 502 into which the terminal 511 of the connector 51 is inserted.

The circuit mounted on the circuit board 50 includes, for example, a circuit that adjusts a current supplied to the Hall element 20 and a circuit that amplifies a magnetic flux detection signal output from the Hall element 20. The hall element 20 is connected to an external circuit such as a control unit via a circuit board 50 including a connector 51.

The connector 51 has a terminal 511 electrically connected to the Hall element 20 in the circuit board 50 and a non-conductive housing 512 combined with the terminal 511 so as to surround the terminal 511. The housing 512 of the connector 51 is a molded member made of non-conductive resin such as polyamide (PA), polypropylene (PP), polybutylene terephthalate (PBT), or ABS resin.

2 to 4, in the present embodiment, the housing 512 of the connector 51 is fixed to the circuit board 50 by screws 7. Therefore, the circuit board 50 is formed with two screw holes 503 through which shaft portions of the two screws 7 that fix the housing 512 of the connector 51 pass.

Furthermore, the circuit board 50 is also formed with a screw hole 504 through which the screw 7 for fixing the circuit board 50 to the device support 40 passes. In the example shown in FIG. 2, the screw holes 504 are chipped portions that are recessed inward from the edges on both sides of the circuit board 50. Thereby, the circuit board 50 is formed as small as possible.

<Equipment support>
The device support 40 is a member made of a non-conductive material and supporting the magnetic core 10 and the Hall element 20 in a fixed positional relationship. Of the constituent elements of the current sensor 1, the set of the device support 40 and the magnetic core 10 and the Hall element 20 combined therewith is referred to as a basic unit 1 x of the current sensor 1. 6 and 7 are an exploded sectional view and an exploded perspective view, respectively, of the basic unit 1x, and FIGS. 8 and 9 are a perspective view and a sectional view, respectively, of the basic unit 1x.

As shown in FIGS. 2, 4 to 9, the device support 40 is formed with a bus bar hole 433 through which a relay bus bar 30 described later passes. 3, 4, 7 to 9, the device support 40 is formed without protruding from the outer edge of the magnetic core 10 except for a part of the region from both ends of the magnetic core 10. Has been. Therefore, in the housing 8, the region other than the vicinity of both end portions of the outer edge portion of the magnetic core 10 is exposed.

As shown in FIG. 2, the device support 40 is composed of a first element member 41 and a second element member 42 combined therewith. The first element member 41 and the second element member 42 are non-conductive members that are integrally molded. The first element member 41 and the second element member 42 are molded members made of a non-conductive resin such as polyamide (PA), polypropylene (PP), polybutylene terephthalate (PBT), or ABS resin.

The first element member 41 and the second element member 42 are provided with a lock mechanism 47 that holds them in a combined state. The lock mechanism 47 shown in FIG. 2 is formed by a claw portion 471 that protrudes inward from both sides of the second element member 42 and a step portion 472 formed on the side surface of the first element member 41. Yes. When the claw portion 471 of the second element member 42 is hooked on the step portion 472 of the first element member 41, the first element member 41 and the second element member 42 are held in a state where they are combined.

Here, the definition of the first direction R1, the second direction R2, and the third direction R3 used for convenience of description of the current sensor 1 will be described with reference to FIGS. In the following description, the first direction R <b> 1 is a penetration direction of the bus bar hole 433 in the device support 40. This first direction R1 is also a direction in which a relay bus bar 30 described later passes through the hollow portion 11 of the magnetic core 10, and is also a thickness direction of the magnetic core 10. The second direction R2 is a direction from the center P1 of the bus bar hole 433 toward the center P2 of the position where the magnetic detection unit 21 of the Hall element 20 is disposed. The second direction R2 is a direction orthogonal to the first direction R1. The third direction R3 is a direction orthogonal to the first direction R1 and the second direction R2. As shown in FIG. 2, the first element member 41 and the second element member 42 are combined along the second direction R2.

As shown in FIGS. 2, 6, and 7, the device support 40 includes a core support portion 43, an element support portion 44, a substrate fixing portion 46, a core rotation limiting portion 48, and a gap lid portion 49. In the present embodiment, the core support portion 43, the element support portion 44, and the substrate fixing portion 46 are formed on the first element member 41 that constitutes the device support tool 40. The core rotation restricting portion 48 and the gap lid portion 49 are formed on the second element member 42 that constitutes the device support 40.

<Equipment support: Core support>
The core support portion 43 penetrates through the hollow portion 11 of the magnetic core 10 and is formed to face the inner edge portion of the magnetic core 10, supports the magnetic core 10 in contact with the inner surface thereof, and supports the magnetic core 10. Is a part that restricts displacement in the first direction R1 (thickness direction).

More specifically, the core support portion 43 has a support shaft portion 431 and a pair of core displacement limiting portions 432. The support shaft portion 431 is a portion that penetrates the hollow portion 11 of the magnetic core 10 and supports the inner surface of the magnetic core 10. The pair of core displacement limiting portions 432 are portions that are formed to face the inner edge portions of the front and back surfaces of the magnetic core 10 and limit the displacement of the magnetic core 10 in the first direction R1 (thickness direction). .

As shown in FIG. 6, the support shaft portion 431 of the core support portion 43 is formed with a width W1 larger than the distance D2 between both end faces of the magnetic core 10 in the third direction R3. Further, the support shaft portion 431 is formed with a width W2 smaller than the distance D2 between both end faces of the magnetic core 10 in the direction intersecting the third direction R3. In the present embodiment, the support shaft portion 431 is formed with a width W2 smaller than the distance D2 between the both end faces of the magnetic core 10 in the second direction R2.

Further, as shown in FIG. 6, the surfaces 4311 at both ends in the third direction R3 of the support shaft portion 431 of the core support portion 43 are arc-shaped curved surfaces along the inner surface of the magnetic core 10. Furthermore, as shown in FIG. 6, the core support portion 43 passes from one of the surfaces 4311 at both ends in the third direction R3 to the other of the surfaces 4311 at both ends in the third direction R3 through the second direction R2 side. It is formed in a series of plate shapes. Thereby, the core support part 43 forms a partition that partitions the bus bar hole 433 and the space in which the magnetic detection part 21 of the Hall element 20 is disposed. The space where the magnetic detection unit 21 of the Hall element 20 is disposed is the gap portion 12 of the magnetic core 10.

By the way, the core support portion formed from the hollow portion 11 of the magnetic core 10 to the inner edge portions of the front and back surfaces may be constituted by two members combined so as to sandwich the magnetic core 10 in the first direction R1. Conceivable. In this case, if the outer diameter of the portion of the support shaft that penetrates the hollow portion 11 of the magnetic core 10 in the core support portion is smaller than the width D1 of the hollow portion 11 of the magnetic core 10, both end surfaces of the magnetic core 10 It may be larger than the interval D2.

However, in the present embodiment, the magnetic core 10 and the Hall element 20 are supported by the first element member 41 formed integrally. In this case, as shown in FIGS. 5 and 6, in the assembly process of the current sensor 1, the support shaft portion 431 of the core support portion 43 is inserted into the hollow portion 11 from the gap portion 12 of the magnetic core 10. Become.

As described above, the support shaft portion 431 of the core support portion 43 is formed with a width W2 smaller than the distance D2 between the both end faces of the magnetic core 10 in the direction intersecting the third direction R3. Therefore, it is possible to insert the support shaft portion 431 from the gap portion 12 of the magnetic core 10 into the hollow portion 11. Further, the support shaft portion 431 is formed with a width W1 larger than the distance D2 between the both end faces of the magnetic core 10 in the third direction R3.

That is, the support shaft portion 431 has a gap D2 between both end faces of the magnetic core 10 in a state where the gap portion 12 of the magnetic core 10 faces the second direction R2, that is, in a state where the magnetic core 10 is to be held. It is formed over the exceeding range. Therefore, after the support shaft portion 431 is inserted into the hollow portion 11 from the gap portion 12 of the magnetic core 10, if the magnetic core 10 is rotated until the gap portion 12 faces the second direction R2, the core The support portion 43 can appropriately support the magnetic core 10.

In the present embodiment, the inner surface of the support shaft portion 431 in the core support portion 43, that is, the surface facing the bus bar hole 433 is formed by the inner surface of the magnetic core 10 supported by the support shaft portion 431. It is formed in a cylindrical shape concentric with the arc.

<Equipment support: element support>
The element support portion 44 is a portion that supports the Hall element 20 in a state in which the magnetic detection portion 21 is located in the gap portion 12 of the magnetic core 10.

In the example shown in FIGS. 6, 7, and 9, the element support portion 44 is formed in a pair of walls facing each other in the first direction R <b> 1 with the gap portion 12 of the magnetic core 10 in between, and holes are formed on the facing surfaces. This is a portion where a groove 441 into which the edge of the magnetic detection unit 21 in the element 20 is fitted is formed. The edge of the magnetic detection unit 21 in the Hall element 20 is fitted into the groove 441 of the element support unit 44, whereby the detection center point of the magnetic detection unit 21 is positioned in the gap portion 12 of the magnetic core 10.

Further, the element support portion 44 is formed in a pair of walls facing each other with the gap portion 12 of the magnetic core 10 therebetween, so that the first direction R1 (magnetic material) in the gap portion 12 of the magnetic core 10 is formed. The opening in the thickness direction of the core 10 is closed.

<Equipment support: substrate fixing part>
The board fixing part 46 is a part to which the circuit board 50 is fixed. As shown in FIG. 7, the board fixing portion 46 in the present embodiment is two screw seats in which screw holes 461 to which the two screws 7 for fixing the circuit board 50 are respectively attached are formed. The circuit board 50 is fixed to the board fixing part 46 with screws 7.

<Equipment support: core rotation limiter>
2, 6, and 9, the core rotation restricting portion 48 is formed to protrude from the second element member 42, and is in contact with both end surfaces of the magnetic core 10 and is supported by the core support portion 43. 10 is a part which restrict | limits rotating in the plane orthogonal to 1st direction R1 (thickness direction of the magnetic body core 10).

If the first element member 41 and the second element member 42 are combined after the magnetic core 10 is rotated until the gap portion 12 faces the second direction R2, the core rotation limitation of the second element member 42 is achieved. The rotation of the magnetic core 10 is limited by the part 48, and the magnetic core 10 is appropriately positioned.

<Equipment support: gap lid>
2, 6, 7, and 9, a through hole 45 through which the lead terminal 22 of the Hall element 20 passes is formed, and the gap core portion 49 of the magnetic core 10 in the gap portion 12 of the magnetic core 10 is formed. It is a portion that closes the opening on the outer peripheral side. In the present embodiment, the plurality of lead terminals 22 of the Hall element 20 pass through one slit-shaped through hole 45.

Therefore, the gap portion 12 of the magnetic core 10 in which the magnetic detection portion 21 of the Hall element 20 is disposed is the core support portion 43, the element support, except for the portion of the through hole 45 through which the lead terminal 22 of the Hall element 20 passes. It is closed from all sides by the portion 44 and the gap lid portion 49.

<Current sensor mounting structure>
Next, an example of the mounting structure of the current sensor 1 in the housing 8 will be described with reference to FIGS. The current sensor 1 is mounted in the housing 8 in a state in which the relay bus bar 30 constituting a part of the bus bar accommodated in the housing 8 is penetrated.

<Relay bus bar>
The bus bar accommodated in the housing 8 includes a relay bus bar 30 penetrating through the bus bar hole 433 of the current sensor 1, the other bus bars 9 in the front stage and the rear stage connected to both ends 32 of the relay bus bar 30, Is included. The relay bus bar 30 is a member independent of the other bus bars 9. In the perspective view of FIG. 11, the current sensor 1 in which the relay bus bar 30 is set and the other bus bar 9 connected to the relay bus bar 30 are shown. 12 shows the relay bus bar 30 before being connected to another bus bar 9 and the current sensor 1 in which the relay bus bar 30 is set.

The relay bus bar 30 and the other bus bar 9 are conductors made of a metal such as soft copper or aluminum, for example. The relay bus bar 30 and the other bus bars 9 connected to the front and rear stages form a current transmission path from the battery to the electrical equipment, for example. A current to be measured by the current sensor 1 flows through the relay bus bar 30.

The other bus bar 9 connected to both ends 32 of the relay bus bar 30 is a flat conductor. On the other hand, the relay bus bar 30 is a rod-like conductor that is narrower and thicker than the other bus bars 9. An intermediate portion 31 between both end portions 32 of the relay bus bar 30 is a portion that penetrates the bus bar hole 433 of the device support 40. The outer peripheral surface of the intermediate part 31 is formed in a shape along the surface around the bus bar hole 433 in the device support 40. Here, a surface around the bus bar hole 433 is an inner surface of the core support portion 43.

The intermediate part 31 of the relay bus bar 30 is in a state where there is almost no gap between the intermediate part 31 and the inner side surface of the core support part 43. In the present embodiment, since the inner side surface of the core support portion 43 is a cylindrical surface, the intermediate portion 31 of the relay bus bar 30 is formed in a columnar shape. As shown in FIG. 10, the relay bus bar 30 is passed through the bus bar hole 433 of the current sensor 1.

Further, as shown in FIG. 11, in the electrical junction box 2, both end portions 32 connected to the intermediate portion 31 of the relay bus bar 30 are connected to the other bus bars 9 in the front and rear stages. As shown in FIG. 10, flat surfaces are formed at the end portions 32 on both sides of the relay bus bar 30 so that a large contact area between the relay bus bar 30 and the other flat bus bar 9 is ensured. Yes.

The end 32 of the relay bus bar 30 and the other bus bar 9 are connected by, for example, spot welding, caulking, or screwing.

<Supporting part of current sensor>
A portion for supporting the current sensor 1 is formed in the housing 8 of the electrical junction box 2. In the example shown in FIG. 10, a substrate support portion 81 and a relay bus bar support portion 82 are formed in the housing 8 as portions that support the current sensor 1.

The substrate support portion 81 is a portion that supports the circuit board 50 of the current sensor 1, and the relay bus bar support portion 82 is a portion that supports the end portions 32 on both sides of the relay bus bar 30. The device support 40 of the current sensor 1 is supported by the substrate support portion 81 via the circuit board 50 and is also supported by the relay bus bar support portion 82 via the relay bus bar 30.

In the example shown in FIG. 10, the board support portion 81 is a portion where a groove 811 into which the circuit board 50 is inserted is formed. The circuit board 50 is fixed in the housing 8 by being sandwiched between, for example, the board support portion 81 and a protrusion formed on the lid constituting the housing 8. The relay bus bar 30 is fixed in the housing 8 by being sandwiched between, for example, the relay bus bar support portion 82 and a protrusion formed on the lid of the housing 8.

It is also conceivable that the circuit board 50 or the device support 40 is fixed in the housing 8 with screws or the like.

<Effect>
In the current sensor 1 described above, the magnetic core 10, the hall element 20, and the circuit board 50 that constitute the current sensor 1 are combined via the device support 40. Therefore, unlike the case where the devices constituting the current sensor 1 are individually assembled in the housing 8 of the electrical junction box 2, the assembly work of the current sensor 1 to the housing 8 is not complicated.

Furthermore, the device support 40 of the current sensor 1 is formed so as not to protrude from the outer edge portion of the magnetic core 10 except for a part of the region from both ends of the magnetic core 10. Therefore, the contour shape of the magnetic core 10 is the contour shape of the current sensor 1 at portions other than the vicinity of both end portions of the magnetic core 10. Therefore, the current sensor 1 is space-saving compared with the conventional current sensor by the thickness of the housing that accommodates the magnetic core and the gap between the magnetic core and the housing.

In addition, since the current sensor 1 is housed in the housing 8, even if the current sensor 1 itself does not include a housing for housing the magnetic core 10 or the like, there are problems in electrical insulation and dust resistance. Does not occur.

In the current sensor 1, the magnetic core 10, the Hall element 20, and the circuit board 50 are supported by a first element member 41 that is integrally formed, and further the core support portion 43 and element support of the first element member 41. The part 44 is formed in a relatively small region from the inner edge of the magnetic core 10 to both ends. Therefore, the magnetic core 10 and the Hall element 20 are positioned with high accuracy, and variations in current detection sensitivity are suppressed.

Furthermore, in the assembly process of the current sensor 1, after the support shaft portion 431 of the core support portion 43 is inserted into the hollow portion 11 from the gap portion 12 of the magnetic core 10, the magnetic core 10 is changed to the gap portion 12. If rotated to a state facing the two directions R2, the core support portion 43 can appropriately support the magnetic core 10.

Furthermore, if the first element member 41 and the second element member 42 are combined after the magnetic core 10 is rotated until the gap portion 12 faces the second direction R2, the core of the second element member 42 is obtained. The rotation limiting unit 48 limits the rotation of the magnetic core 10 so that the magnetic core is appropriately positioned.

The inner surface of the magnetic core 10 is an arc-shaped curved surface, and the surfaces 4311 at both ends in the third direction R3 of the support shaft portion 431 of the core support portion 43 are circles along the inner surface of the magnetic core 10. An arcuate curved surface. Therefore, after the support shaft 431 is inserted into the hollow portion 11 of the magnetic core 10, the magnetic core 10 can be smoothly rotated while sliding on the curved surfaces 4311 of the support shaft 431. .

In the magnetic current sensor 1, the magnetic core 10 formed in an annular shape together with the gap portion 12 focuses the magnetic flux more efficiently than other magnetic cores such as a rectangular shape.

Further, the core support portion 43 of the current sensor 1 forms a partition that partitions the bus bar hole 433 and the gap portion 12 of the magnetic core 10. Therefore, the creepage distance between the relay bus bar 30 penetrating the bus bar hole 433 and the hall element 20 disposed in the gap portion 12 of the magnetic core 10 is increased, and the hall element 20 is damaged due to a surge voltage applied to the relay bus bar 30. Is less likely to occur.

In addition, the gap portion 12 of the magnetic core 10 in which the Hall element 20 is disposed has a core support portion 43, an element support portion 44, and a gap lid except for a portion of the through hole 45 through which the lead terminal 22 of the Hall element 20 passes. It is blocked from all sides by the part 49. For this reason, the air that is temporarily excessively heated due to the heat generated by the other electrical components 6 in the housing 8 does not easily flow into the gap portion 12 of the magnetic core 10 where the magnetic detection portion 21 of the Hall element 20 exists. Thus, the fluctuation range of the ambient temperature of the magnetic detection unit 21 can be suppressed small. As a result, it is possible to avoid failure of the Hall element 20 that is relatively weak at high temperatures due to temporary excessive temperature rise of the air in the housing 8.

Further, the housing 512 of the connector 51 that relays the electrical connection between the Hall element 20 and other devices is fixed to the circuit board 50. Therefore, when a mating connector connected to another device is attached to or detached from the connector 51 of the current sensor 1, an external force applied to the housing 512 of the connector 51 is a connection portion between the terminal 511 of the connector 51 and the circuit board 50. Without being acted upon by the circuit board 50 fixed to the device support 40. As a result, the connection portion between the terminal 511 of the connector 51 and the circuit board 50 is prevented from being damaged by an external force applied to the housing 512 of the connector 51.

Further, since the relay bus bar 30 penetrating the bus bar hole 433 of the current sensor 1 is connected to the other bus bar 9, regardless of the width of the other general flat bar bus bar 9 attached to the electrical connection box 2, A small magnetic core 10 can be employed. Therefore, further space saving of the current sensor 1 is possible.

Further, the intermediate portion 31 of the relay bus bar 30 penetrating the bus bar hole 433 of the device support tool 40 is formed in a shape along the surface around the bus bar hole 433, and the relay bus bar 30 is located between the device support tool 40 and the intermediate bus bar 30. There is almost no gap. Therefore, even when the small magnetic core 10 is adopted, the electrical resistance of the relay bus bar 30 is suppressed to be small by adopting a relay bus bar that is as thick as possible as long as it can be inserted into the bus bar hole 433. Excessive heat generation is prevented.

<Second Embodiment>
Next, an electrical junction box 2A and a current sensor 1A according to a second embodiment of the present invention will be described with reference to FIGS. The electrical connection box 2A and the current sensor 1A are different from the electrical connection box 2 and the current sensor 1 shown in FIGS. 1 to 11 only in the circuit board and the connector fixing structure. 13 and 14, the same components as those shown in FIGS. 1 to 12 are denoted by the same reference numerals. Hereinafter, only differences between the electrical junction box 2 and the current sensor 1 in the electrical junction box 2A and the current sensor 1 will be described.

The electrical connection box 2A includes a housing 8A integrated with the connector 51A. The current sensor 1A does not include the connector 51, but includes a circuit board 50A having a structure different from that of the circuit board 50 of the current sensor 1. That is, the electrical junction box 2A has a configuration in which the circuit board 50 and the connector 51 in the configuration of the electrical junction box 2 are replaced with the circuit board 50A and the connector 51A.

The current sensor 1A includes a circuit board 50A and a basic unit 1x constituting a part of the current sensor 1. The circuit board 50A is fixed to the board fixing part 46 of the basic unit 1x with screws 7.

The circuit board 50A is mounted with a lead terminal 22 of the Hall element 20, a circuit electrically connected to the lead terminal 22, and a terminal 511 of a connector 51A that relays the connection between the circuit and an external control unit. Substrate. Therefore, a mounting hole 501 into which the lead terminal 22 of the Hall element 20 is inserted and a mounting hole 502 into which the terminal 511 of the connector 51A is inserted are formed in the circuit board 50A.

The connector 51A includes a terminal 511 electrically connected to the Hall element 20 on the circuit board 50A and a non-conductive housing 512A surrounding the terminal 511. In the electrical junction box 2A, the housing 512A of the connector 51A is formed as a part of the housing 8A, and the terminal 511 of the connector 51A is incorporated in the housing 512A portion of the housing 8A in advance.

Therefore, the terminal 511 of the connector 51A is mounted in the mounting hole 502 portion of the circuit board 50A when the current sensor 1A including the circuit board 50A is attached to the housing 8A.

Further, in the electrical junction box 2A, the circuit board 50A of the current sensor 1A is fixed to the board support portion 81A of the housing 8A by screws 7. As a result, the device support 40 of the current sensor 1A is supported by the board support part 81A via the circuit board 50A and also supported by the relay bus bar support part 82 via the relay bus bar 30.

By adopting the electrical junction box 2A, the same effect as when the electrical junction box 2 is employed can be obtained. In the electrical connection box 2A, the external force applied to the housing 512A of the connector 51A is received by the housing 8A of the electrical connection box 2A without acting on the connection portion between the terminal 511 of the connector 51A and the circuit board 50A. As a result, the connection portion between the terminal 511 of the connector 51A and the circuit board 50A is prevented from being damaged by an external force applied to the housing 512A of the connector 51A.

<Others>
In the

electrical junction boxes

2 and 2A, instead of the structure in which the

circuit boards

50 and 50A are supported by the

board support portions

81 and 81A of the

casings

8 and 8A, the device support 40 is supported by a part of the

casings

8 and 8A. A structure may be employed. Similarly, in the

electrical junction boxes

2 and 2A, instead of the structure in which the relay bus bar 30 is supported by the relay bus bar support portion 82 of the

casings

8 and 8A, the device support 40 is supported by a part of the

casings

8 and 8A. A structure may be employed.

In the

current sensors

1 and 1A, the device support 40 that supports the magnetic core 10 and the Hall element 20 in a fixed positional relationship may be configured by two element members combined in the first direction R1. .

In the

current sensors

1 and 1A, it is also conceivable that the through holes 45 of the second element member 42 in the device support 40 are individually formed for each of the plurality of lead terminals 22 provided in the Hall element 20.

In the

current sensors

1 and 1A, the magnetic core 10 may be formed in an annular shape other than the annular shape together with the gap portion 12. In this case, the apparatus support 40 is comprised by the two element members combined, for example in 1st direction R1.

DESCRIPTION OF

SYMBOLS

1,1A Current sensor 10 Magnetic body core 11 Hollow part of magnetic body core 12 Gap part of magnetic body core 1x

Basic unit

2,2A Electrical connection box 20 Hall element 21 Hall element magnetic detection part 22 Hall element lead terminal 30 Relay Bus bar 31 Intermediate portion of relay bus bar 32 End portion of relay bus bar 40 Device support 41 First element member 42 Second element member 43 Core support portion 431 Support shaft portion 4311 End surface of support shaft portion 432 Core displacement limiting portion 433 Bus bar hole 44 Element support part 441 Groove 45 Through hole 46 Board fixing part 461 Screw hole 47 Lock mechanism 471 Claw part 472 Step part 48 Core rotation restricting part 49 Gap cover

part

50, 50A Circuit board 501 502 Mounting hole 503 504

Screw Hole

51, 51A Connector 511

Connector terminal

512, 512A Necta housing 6 Electrical component 7

Screw

8,

8A Housing

81, 81A Substrate support portion 811 Groove 82 Relay bus bar support portion 9 Bus bar D1 Width of hollow portion of magnetic core D2 Distance between both ends of magnetic core P1 Center of bus bar hole P2 Center of the position where the magnetic detection unit is arranged R1 First direction R2 Second direction R3 Third direction

Claims

A bus bar (9),
A current sensor (1) for measuring a current flowing through the bus bar (9);
An electrical connection box (2) comprising a non-conductive material and a housing (8) to which the bus bar (9) and the current sensor (1) are attached,
The current sensor (1)
A gap portion (12) made of a magnetic material and formed in a series surrounding the periphery of the hollow portion (11) through which the bus bar (9) passes, with both end faces narrower than the width of the hollow portion (11). A magnetic core (10) opposed to each other,
A magnetoelectric transducer (20) that is disposed in the gap portion (12) of the magnetic core and measures a magnetic flux that changes according to a current passing through the hollow portion (11) of the magnetic core;
A circuit board (50) on which the magnetoelectric transducer (20) is mounted;
The magnetic core (10) is made of a non-conductive material, has a bus bar hole (433) through which the bus bar (9) passes, and excludes a part of the magnetic core (10) from both ends. And an equipment support (40) that supports the magnetic core (10) and the magnetoelectric conversion element (20) in a fixed positional relationship.
The device support (40)
The magnetic core is formed so as to penetrate the hollow portion (11) of the magnetic core and face the inner edge of the magnetic core (10), and support the magnetic core (10) in contact with the inner surface thereof. A core support portion (43) that restricts displacement of the magnetic core (10) in the thickness direction;
An element support part (44) for supporting the magnetoelectric conversion element (20) in a state where the magnetic detection part (21) is located in the gap part (12) of the magnetic core (10);
And an electric connection box having a board fixing part (46) to which the circuit board (50) is fixed.
The electrical junction box according to claim 1,
The device support (40)
A first element member (41) comprising an integrally formed member and having the core support portion (43), the element support portion (44) and the substrate fixing portion (46);
The magnetic core (10), which is formed of an integrally molded member and is in contact with both end faces of the magnetic core (10) and supported by the core support portion (43), is the thickness of the magnetic core (10). A second element member (42) having a core rotation restricting part (48) for restricting rotation in a plane perpendicular to the direction and combined with the first element member (41),
A portion of the core support portion (43) that passes through the hollow portion (11) of the magnetic core includes a first direction (R1) that is a direction through which the bus bar hole (433) passes and the bus bar hole (433). Of the magnetic core (10) in a third direction (R3) orthogonal to a second direction (R2) from the center of the magnetoelectric transducer toward the center of the position where the magnetic detection unit (21) of the magnetoelectric transducer is disposed. It is formed with a width larger than the distance between both end faces,
The portion of the core support portion (43) that passes through the hollow portion (11) of the magnetic core is perpendicular to the first direction (R1) and intersects the third direction (R3). An electrical junction box formed with a width smaller than the distance between both end faces of the magnetic core (10).
The electrical junction box according to claim 2,
The inner surface of the magnetic core (10) is an arcuate curved surface,
The surfaces of both end portions in the third direction (R3) of the portion of the core support portion (43) that penetrates the hollow portion (11) of the magnetic core are along the inner surface of the magnetic core (10). An electrical junction box that is an arcuate curved surface.
The electrical junction box according to any one of claims 1 to 3,
The said core support part (43) is an electrical junction box which comprises the partition which partitions off the said bus-bar hole (433) and the said gap part (12) of the said magnetic body core.
The electrical junction box according to claim 4,
The device support (40) is formed with a through hole (45) through which a lead terminal of the magnetoelectric conversion element passes, and on the outer peripheral side of the magnetic core (10) in the gap portion (12) of the magnetic core. A gap lid (49) for closing the opening;
The element support part (44) supports the magnetoelectric conversion element (20) and closes the opening in the thickness direction of the magnetic core (10) in the gap part (12) of the magnetic core. .
An electrical junction box according to any one of claims 1 to 5,
A terminal (511) electrically connected to the magnetoelectric conversion element (20) in the circuit board (50), and a non-conductive housing that surrounds the terminal (511) and is fixed to the circuit board (50) An electrical junction box further comprising a connector (51) having (512).
An electrical junction box according to any one of claims 1 to 5,
A terminal (511) electrically connected to the magnetoelectric conversion element (20) in the circuit board (50A) and a non-conducting shape surrounding the terminal (511) and molded as a part of the casing (8A) An electrical junction box further comprising a connector (51A) having a sexual housing (512A).
The electrical junction box according to any one of claims 1 to 7,
The bus bar (9) has an outer peripheral surface formed in a shape along the surface around the bus bar hole (433) in the device support (40) and an intermediate part (31) passing through the bus bar hole (433). An electric junction box including a bar-shaped relay bus bar (30) having both ends (32) connected to other bus bars in the front stage and the rear stage in series with the intermediate part (31).
A current sensor for measuring a current flowing through the bus bar (9),
The gap portion (12) is made of a magnetic material and is formed in series around the periphery of the hollow portion (11) through which the bus bar (9) passes, with both end faces narrower than the width of the hollow portion (11). A magnetic core (10) opposed to each other,
A magnetoelectric transducer (20) that is disposed in the gap portion (12) of the magnetic core and measures a magnetic flux that changes according to a current passing through the hollow portion (11) of the magnetic core;
A circuit board (50) on which the magnetoelectric transducer (20) is mounted;
The magnetic core (10) is made of a non-conductive material, has a bus bar hole (433) through which the bus bar (9) passes, and excludes a part of the magnetic core (10) from both ends. And an equipment support (40) that supports the magnetic core (10) and the magnetoelectric conversion element (20) in a fixed positional relationship.
The device support (40)
The magnetic core is formed so as to penetrate the hollow portion (11) of the magnetic core and face the inner edge of the magnetic core (10), and support the magnetic core (10) in contact with the inner surface thereof. A core support (43) for restricting the magnetic core (10) from being displaced in the thickness direction;
An element support portion (44) for supporting the magnetoelectric conversion element (20) in a state where the magnetic detection portion (21) is located in the gap portion (12) of the magnetic core;
And a circuit board fixing part (46) to which the circuit board (50) is fixed.