JP2005090982A - Current sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a current sensor having excellent assembleability, capable of securing a creepage distance between a primary circuit and a secondary circuit without using a three-layer wire. <P>SOLUTION: This current sensor is equipped with first and second bobbin half bodies 2, 3 forming a bobbin 1 by being integrated oppositely, a coil 6 formed by being wound beforehand, cores 5 having respectively first and second legs 5a, 5b to be incorporated respectively with each side plate 11 of the bobbin 1, and a printed board 8 incorporated in the back side of the bobbin 1 and having a Hall element 7 arranged in a gap between cores 5. A cylindrical core leg insertion part 16 into which the first leg 5a of the core 5 is inserted is formed on the first bobbin half body 2, and a cylindrical coil mounting part 22 wherein the core leg insertion part 16 is to be inserted and stored inside and the coil 6 is to be mounted on the circumference is formed on the second bobbin half body 3. The coil 6 can be fitted and simply mounted on the coil mounting part 22, and also a lead-out wire 12 can be easily led outside. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a general-purpose inverter for industrial use, a current sensor used for motor control and the like.

  In the conventional current sensor of this type shown in FIG. 10, the assembly process up to the winding is performed by inserting a plurality of sheet-shaped cores formed in a C shape into the metal fitting 100 formed corresponding to the core shape. The C-shaped core 101 was used, the claws 102 of the metal fitting 100 were bent, the bobbin halves 104 and 105 were respectively covered from the vertical direction, and the Mylar tape 106 was wound around the outer periphery to be integrated.

  After that, the three-layer coated electric wire 107 was wound around the outer periphery of the bobbin winding body portion composed of the integrated bobbin halves 104 and 105, and the insulating paper 108 was inserted between the three-layer coated electric wire 107 and the core 101. .

  A hall element 110 incorporated in the printed circuit board 109 is arranged in the gap of the core 101 of the assembly, and these elements are incorporated on the exterior base 111 and covered with a box-shaped exterior case 112 to constitute a current sensor. It was.

  In this conventional current sensor, the three-layer coated electric wire 107 or the three-layer coated electric wire 107 is wound to ensure the creepage distance between the electric wire (primary circuit) and the metal fitting 100 or the core 101 (secondary circuit). Had to use a turned bobbin.

  As shown in FIG. 11, in the three-layer coated electric wire 107, the outer periphery of the copper wire 107a is, for example, a first layer 107b made of polyester resin, a second layer 107c made of polyester resin, and a first layer made of polyamide resin. It is formed by covering with three layers 107d, etc., and is considerably more expensive than general polyester-coated electric wires and polyurethane-coated electric wires. Adding a bobbin or the like incurs mold costs and further increases the types of parts. There was a problem of increasing the score.

  This conventional current sensor shown in FIG. 10 uses a C-shaped core 101. When the three-layer coated electric wire 107 is wound around a bobbin, the three-layer coated electric wire 107 is placed in a narrow space inside the C-shaped core 101. Therefore, there is a problem that winding is difficult, and care must be taken not to damage the three-layer coating during winding, and the three-layer coating electric wire 107 itself is hard and difficult to wind.

  On the other hand, Japanese Patent Laid-Open No. 5-333059 exists as a prior example in which the creepage distance between the primary circuit and the secondary circuit can be obtained without using the three-layer coated electric wire 107.

In this current sensor, as shown in FIGS. 12A and 12B, a pair of cores 200 having one end facing each other across a gap and the other end contacting each other, and a contact end portion of the core 200 are inserted. A coil bobbin 203 having a body part 202 in which a window part 201 is formed, a coil 204 wound around the body part 202 of the coil bobbin 203, and an object to be introduced into the coil 204 disposed in the gap of the core 200. A magnetosensitive element 205 for deriving an output signal corresponding to the detected current, the magnetosensitive element 205 and other circuit elements are mounted, and a circuit board 206 supported by the coil bobbin 203 is provided.
JP-A-5-333059

  However, in this current sensor, the coil 204 is wound around the body 202 of the bobbin 203, and the terminal passes through the notch 207 of the bobbin 203 and is then bent downward to form the coil lead 208. There is a problem that the winding work and the processing of the terminal are complicated and workability is poor.

  Further, since the circuit board 206 is provided at one end of the bobbin 203 and the other end of the bobbin 203 is open, there is a problem that the strength is weak.

  The present invention has been proposed in view of the above, and its object is to ensure a creepage distance between the primary circuit and the secondary circuit without using a three-layer electric wire, and to have good assembly. The object is to provide a current sensor having sufficient strength.

According to claim 1, first and second bobbin halves 2 and 3 which are arranged to face each other and are integrated to form a bobbin 1, and a coil 6 which is pre-wound and is attached to the bobbin 1. And the core 5 having the first and second legs 5a and 5b, which are respectively incorporated in the side plates 11 of the bobbin 1, and the back surface of the bobbin 1, and are arranged between the gaps of the core 5. A printed circuit board 8 having a Hall element 7;
The first bobbin half 2 is formed with a cylindrical core leg insertion portion 16 into which the first leg 5a of the core 5 is inserted,
The second bobbin half 3 is formed with a cylindrical coil mounting portion 22 in which the core leg insertion portion 16 is inserted and housed, and the coil 6 is mounted on the outer periphery.
The second leg 5b of the core 5 is arranged outside the back surface of the bobbin 1, and the Hall element 7 is arranged between the ends of the legs 5b arranged opposite to each other, thereby achieving the above object. .

  According to Claim 2, the coil 6 separately prepared in advance is composed of a coil body 6c and lead wires 6a and 6b on both sides thereof, and the coil body 6c wound in a ring shape is The coil mounting portion 22 in the bobbin 1 is configured to be fitted and mounted on the outer periphery.

  According to claim 3, in claim 1, a pair of notch-shaped coil leader line positioning and projecting portions 21 are formed on the front side of the bottom plate 10A of the second bobbin 3, and are arranged above the pair. The lead wires 6a and 6b of the coil 6 are drawn out from the coil lead wire positioning / projecting portion 21 to the outside and project.

  According to claim 4, in claim 1, the bobbin 1 includes bottom plates 10, 10A, side plates 11 erected on both sides thereof, a front plate 12 positioned on the front side, and a rear surface on the opposite side. A back plate 14, 14A provided on the side, and an upper plate 13 covering the upper part, and a first leg 5a of the core 5, the coil leg insertion part 16, and a coil mounting part 22 are provided therein, The coil 6 mounted on the outer periphery of the coil mounting portion 22 is provided.

  As described above, according to the first aspect of the present invention, one leg 5a of the core 5 is inserted into the cylindrical core leg insertion portion 16 formed in the bobbin 1, and the outer side of the core leg insertion portion 16 is inserted. The coil body 6c of the coil 6 is provided on the outer periphery of the coil mounting portion 22 of the coil 5, and the connecting portion 5c side of the core 5 is positioned outside the side surface of the bobbin 1, and the creepage distance between the coil 6 and the core 5 by the bobbin 1 Therefore, the wire used can be changed from a three-layer coated wire to a single-layer polyester-coated wire or polyurethane-coated wire, etc., and the cost can be reduced. The diameter can be reduced only to the minimum size.

  According to the second aspect of the present invention, the coil 6 can be formed into a coil shape by semi-automating the electric wire in a separate process in advance, and the hollow portion of the coil body 6 c is simply inserted into the outer periphery of the coil mounting portion 22. The coil 6 can be easily attached, and the winding work in the assembly process of integrating the first and second bobbin halves 2 and 3 is eliminated, so that the workability is improved and the winding of the electric wire is increased. Minimization can be achieved from this point as well.

  Furthermore, according to the third aspect of the present invention, the linear lead wires 6a and 6b of the coil 6 can be easily projected to the outside of the bobbin 1 as it is, and the workability is also good from this point.

  Further, according to the present invention described in claim 4, the bobbin 1 has a so-called hermetically sealed structure with the bottom plate 10, 10A, the front plate 12, the side plate 11, the upper plate 13, the rear plate 14, 14A, etc. Has strength.

  The present invention will be described below with reference to the drawings.

  1 is an exploded perspective view of a current sensor according to an embodiment of the present invention, and FIG. 2 is an enlarged perspective view of a bobbin portion.

  As shown in FIG. 1, the current sensor according to the present invention includes a bobbin 1 composed of first and second bobbin halves 2 and 3 that are arranged opposite to each other and integrated, and each side surface 11 of the bobbin 1. One leg 5a and the other leg 5b are connected by a connecting portion 5c, and a pair of cores 5 assembled with the metal fitting 4 and the coil leaders 6a and 6b at the beginning and end of winding are assembled into the bobbin 1. A coil 6 that is drawn out from the front side of the bottom plate 10 and in which the coil body 6c is mounted in the bobbin 1, a printed circuit board 8 having a hall element 7 that is assembled on the back side of the bobbin 1, the bobbin 1 and the core And a plate-like clip 9 having a substantially inverted U-shape that is inserted between the other leg 5b of the core 5 and prevents the other leg 5b of the core 5 from rattling.

  Next, the configuration of each member will be described.

  The first bobbin half 2 includes a bottom plate 10, a side plate 11 erected on the outer side of the bottom plate 10, a front plate 12, an upper plate provided from the front side to the half surface side of the bobbin half 2. 13 and the back plate 14 are integrally formed by molding an insulating resin.

  On the front side of the bottom plate 10, lead-out grooves 15 for leading out the coil lead-out wires 6 a and 6 b of the coil 6 are formed. The lead-out groove 15 is formed linearly from the inner end of the bottom plate 10 toward the side plate 11.

  A cylindrical core leg insertion portion 16 into which one leg 5a of the core 5 is inserted is formed in an almost central portion of the inner surface of the side plate 11.

  An insertion hole for inserting one leg 5 a of the core 5 is formed in the side plate 11 of the first bobbin half 2, and the insertion hole communicates with the core leg insertion portion 16. The side surface 11 is provided with a core mounting portion 17 for mounting the core 5 incorporated in the metal fitting 4, and a printed circuit board mounting portion 18 is projected from the other end portion side of the side plate 11.

  As shown in FIG. 2, the core mounting portion 17 is open at the side surface and is a core insertion portion. Specifically, as shown in FIG. 2, the overall shape is substantially U-shaped, and the end plate 17b located on the bottom plate 17a and the front plate 12 side. And an upper plate 17c. The connecting portion 5c of the core 5 is placed on the bottom plate 17a, and one leg 5a of the core 5 is inserted into the core leg insertion portion 16.

  Further, as shown in FIG. 1, the printed board mounting portion 18 is formed with a notch portion 19 for guiding the other end portion side of the connecting portion 5c of the core 5 and the other leg 5b side of the core 5 at substantially the center portion thereof. Has been. A protrusion 18a is formed on the outer end of the inner surface of each printed circuit board mounting part 18 that is divided into two vertically by way of the notch part 19, and a plate-shaped printed circuit board 8 is inserted and mounted on the inner side. A groove-shaped portion 20 is formed.

  The other leg 5 b of the core 5 is disposed between the back plate 14 of the first bobbin half 2 and the inner surface of the printed circuit board 8 having the Hall element 7, and the inner end of the leg 5 b is connected to the Hall element 7. Opposed. A clip engaging protrusion 5e is formed on the inner side of the tip of the other leg 5b.

  Similar to the first bobbin half 2, the second bobbin half 3 has a bottom plate 10 </ b> A, a side plate 11, an upper plate 13, and a back plate 14 </ b> A. The portion of the second bobbin half 3 corresponding to the front plate 12 of the first bobbin half 2 is open, and the length dimension c on the front side of the upper plate 13 of the second bobbin half 3 is The second bobbin half is formed to have a length dimension c equal to the length c from the inner end of the upper plate 13 of the first bobbin half 2 to the end of the front plate 12 protruding toward the second bobbin half 3. When the first bobbin half 2 is incorporated with respect to 3, the front plate 12 of the first bobbin half 2 formed in a shape corresponding to the opening on the front side of the second bobbin half 3 is positioned. The opening is closed.

  On the front side of the bottom plate 10A of the second bobbin half 3, a pair of substantially U-shaped lead wire positioning / projecting portions 21 extending from the outside to the inside are formed, and the coil 6 is interposed via the lead wire positioning / projecting portion 21. The lead wires 6a and 6b at the beginning and end of winding are projected downward. The lead wire positioning / projecting portion 21 is formed at a position aligned with the lead groove 15 when the first bobbin half 2 is incorporated into the second bobbin half 3.

  A cylindrical coil mounting portion 22 into which the core leg insertion portion 16 of the first bobbin half 2 is inserted is formed at substantially the center of the inner surface of the side plate 11 of the second bobbin half 3.

  Note that a core mounting portion 17 and a printed board mounting portion 18 having the same configuration as that of the first bobbin half 2 are also formed on the side plate 11 of the second bobbin half 3.

  As shown in detail in FIG. 2, the inner end portion 14a of the back plate 14A of the second bobbin half 3 has a length dimension from the end 13a of the upper plate 13 toward the first bobbin half 2 side. Only a is protruding. The length dimension a from the end 13a of the upper plate 13 of the second bobbin half 3 to the end 14a of the back plate 14 is determined from the end 13a of the upper plate 13 on the first bobbin half 2 side to the side plate. It is formed equal to the length dimension a up to 11. Further, when the back plate 14 and the side plate 11 of the first bobbin half 2 are coupled to each other and projecting outwardly, a step portion 14b is formed, and the first and second bobbin halves 2 and 3 are combined, The end portion 14a of the back plate 14A of the second bobbin half 3 is in contact with the stepped portion 14b.

  The end 14c of the back plate 14 of the first bobbin half 2 protrudes from the end 13a of the upper plate 13 toward the second bobbin half 3, and the first and second bobbin halves 2 When 2 and 3 are combined, the projecting portion is inserted and positioned under the upper plate 13 of the second bobbin half 3.

  The length dimension b from the front side to the back side of the bottom plate 10A of the second bobbin half 3 is formed slightly larger than the length dimension of the corresponding portion of the bottom plate 10 of the first bobbin half 2. The bottom plate 10 can be placed and stored on 10A. When the bottom plate 10 is placed on the bottom plate 10A and the first and second bobbin halves 2 and 3 are combined, the end 13a of the upper plate 13 of the second bobbin half 3 and the first bobbin half 2 and the end 13a of the upper plate 13 are joined. In addition, the outer surface of the back plate 14 of the first bobbin half 2 is in contact with the inner side of the extended portion of the back plate 14A of the second bobbin half 3 having the length dimension a, and the second bobbin half 2 The end portion 14a of the extended portion of the back plate 14A of the body 3 is in contact with the stepped portion 14b of the back plate 14 of the first bobbin half and positioned.

  In this case, as shown in FIG. 5, a convex engaging portion 24 is formed at the upper portion of the outer surface of the back plate 14 of the first bobbin half 2, and this engaging portion 24 has a longer dimension. The second bobbin half 3 thus formed is engaged and engaged with an engagement hole 25 (see FIGS. 1 and 2) formed in the back plate 14A.

  In addition, standoffs 23 for mounting on the mounting surfaces are respectively provided at the outer ends of the lower surfaces of the bottom plates 10 and 10A of the first and second bobbin halves 2 and 3. A standoff 23 is also formed corresponding to the lower part of each printed circuit board mounting portion 18.

  Each side portion of the printed circuit board 8 having the Hall element 7 and a plurality of terminals 26 projecting from below is on the other end side of the connecting portion 5c of the core 5 and outside the other leg 5b. A notch 8a for allowing the protruding portion 5d to protrude is formed. Further, a notch-like engaging portion 8b is formed below the notch 8a as shown in detail in FIG. On the other hand, a cross-shaped engaging portion 18b is formed below the inner surface of the printed circuit board mounting portion 18, and when the printed circuit board 8 is mounted on the printed circuit board mounting portion 18, the engaging portion 8b is engaged with the engaging portion 18b. The printed board 8 is positioned and fixed to the printed board mounting portion 18.

  The substantially inverted U-shaped clip 9 provided on the side of the back plates 14 and 14A of the first and second bobbin halves 2 and 3 has a pair of arms 9a. The arm 9 a is formed to be slightly tapered, and a step portion 9 b protruding outward is formed at the inner end, and this step portion 9 b is engaged with the protrusion portion 5 e of the other leg 5 b of the core 5.

  The metal fitting 4 that houses the core 5 has a substantially U-shaped longitudinal section. As shown in detail in FIG. 4, the metal fitting 4 has a rectangular plate-like side plate 4a that contacts the inner surface of the connecting portion 5c of the core 5, and upper and lower surfaces that contact the upper and lower surfaces of the connecting portion 5c. The plate 4b and the lower plate 4c, the bent pieces 4d and 4e formed alternately along the length direction at the ends of the upper plate 4b and the lower plate 4c, and the length direction of the upper plate 4b and the lower plate 4c And a bent piece 4f that abuts against the protruding portion 5d of the other end surface portion of the connecting portion 5c by bending, and the core 5 is fastened and fixed by these. The metal fitting 4 has a pair of projecting pieces 8g which are the base portions of the bent pieces 4b and extend in the same direction as the bent pieces 4d and 4e and are located in the printed circuit board mounting portion 18. The protruding pieces 8g are not alternately positioned but are formed at the same vertical position.

  The core 5 is formed by laminating sheet-like cores, but it is also possible to use a ferrite, a dust core, or the like, and the metal fitting 4 can be omitted.

  As shown in FIG. 1, the coil 6 is composed of a coil body 6c composed of a substantially ring-shaped winding portion and coil lead wires 6a and 6b, and a thick electric wire is separately wound beforehand through a jig (not shown). It is formed by turning. In this case, the inner diameter of the coil body 6 c is formed to be substantially equal to the outer diameter of the coil mounting portion 22 of the second bobbin half 3.

  5 is a plan view of the assembled state of the current sensor, FIG. 6 is a front view, FIG. 7 is a side view, FIG. 8 is a cross-sectional view taken along the line AA in FIG. Show.

  Next, an assembly example will be described.

  First, the coil 6 formed in a predetermined shape is attached to the outer periphery of the coil mounting portion 22 of the second bobbin half 3, and the coil lead wires 6 a and 6 b are projected downward from the lead wire positioning / projecting portion 21. . The drawing operation can be performed very smoothly because the notched lead wire positioning / projecting portion 21 is provided below the coil 6.

  Next, the bottom plate 10 of the first bobbin half 2 is placed on the bottom plate 10A of the second bobbin half 3, and each end of each top plate 13 of the first and second bobbin halves 2, 3 is placed. When the parts are brought together, the front plate 12 of the first bobbin half 2 is arranged at the opening of the front part of the second bobbin half 3. Further, as described above, the end 14c side of the back plate 14 of the first bobbin half 2 is inserted into the top plate 13 of the second bobbin half 3, and the back plate 14 is inside the back plate 14A. The abutment is arranged.

  At this time, the cylindrical core leg insertion portion 16 of the first bobbin half 2 is inserted into the cylindrical coil mounting portion 22 of the second bobbin half 3.

  Further, since the lead wire positioning / projecting portion 21 of the bottom plate 10A of the second bobbin half 3 and the lead groove 15 of the bottom plate 10 of the first bobbin half 2 match, the drawn coil lead wire 6a. , 6b is pulled out as it is and fixed in positioning.

  Next, the printed board 8 having the Hall element 7 is inserted and attached to the groove-shaped portion 20 of the printed board attaching portion 18 of the bobbin 1. In this case, as shown in FIG. 3, the notch-shaped engaging portions 8 b that are located outside the printed circuit board 8 and are formed below both sides of the printed circuit board 8 are formed below the inner surface of the printed circuit board mounting portion 18. It is engaged with the column-shaped engaging portion 18b thus formed, and is prevented from coming off.

  Next, the metal core 4 is attached to the core attaching portion 17 of each side surface 11 of the bobbin 1, and the cores 5 that are bent and tightened by the bent pieces 4 d to 4 f are attached. In this case, one leg 5 a of each core 5 is inserted from both sides of the coil leg insertion part 16 into the inside, and ends of each leg 5 a are joined to each other at a substantially central part of the coil leg insertion part 16. The other leg 5b of each core 5 is disposed on the back plate 14A side of the bobbin 1 with a space therebetween, and the end surfaces thereof are disposed to face each other with a predetermined space, and the Hall element 7 is disposed therebetween. Further, the protruding portion 5 d formed on the other end side of the connecting portion 5 c of each core 5 is positioned at the notch 8 a portion of the printed circuit board 8. In addition, the protrusion piece 4g of the metal fitting 4 is located in the notch part 19 of the printed circuit board attachment part 18, as shown in FIG. 8, without bending like the bending pieces 4d-4f.

  Next, an inverted U-shaped clip 9 having a pair of tapered arms 9a so that the tip can be easily inserted is inserted into the gap between the back plate 14A of the bobbin 1 and the other leg 5b of the core 5. To do. In this case, each arm 9a of the clip 9 is inserted between the connecting portion 5a and the protruding portion 5e on the inner surface side of the other leg 5b of the core 5. Further, a step 9b is formed on the arm 9, and when the clip 9 is pushed downward, the upper portion of the step 9b is positioned and engaged below the protrusion 5e of the other leg 5b of the core 5, Omission is prevented. Further, the other leg 5b is also positioned and fixed, thereby preventing backlash.

  This completes the current sensor.

The disassembled perspective view of one Example of this invention is shown. The expanded perspective view of the coil part of one Example of this invention is shown. It is explanatory drawing which shows the structure of the printed circuit board attachment part of the bobbin concerning one Example of this invention. The expansion perspective view of the core and metal fitting of one example of the present invention is shown. The top view of the assembly state of one Example of this invention is shown. The front view same as the above is shown. The side view same as the above is shown. AA line sectional view in FIG. 7 is shown. FIG. 6 is a sectional view taken along line BB in FIG. 5. The exploded perspective view of one prior art example is shown. The structural example of the three-layer coating | coated electric wire used by one prior art example is shown. (A) is another exploded perspective view, (b) shows a central cross-sectional view seen from the back in the assembled state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bobbin 2 1st bobbin half 3 2nd bobbin half 4 Metal fitting 4a Side plate 4b Upper plate 4c Lower plate 4d Bending piece 4e Bending piece 4f Bending piece 4g Projection piece 5 Core 5a One leg 5b The other Leg 5c Connecting portion 5d Protruding portion 5e Protruding portion 6 Coils 6a, 6b Coil lead wire 6c Coil body 7 Hall element 8 Printed circuit board 8a Notch mounting portion 8b Engaging portion 9 Clip 9a Arm 9b Step portion 10, 10A Bottom plate 11 Side plate 12 Front plate 13 Upper plate 13a End portion 14, 14A Back plate 14a End portion 14b Step portion 14c End portion 15 Pull-out groove 16 Core leg insertion portion 17 Core attachment portion 18 Printed circuit board attachment portion 18a Projection portion 18b Engagement portion 19 Notch Part 20 groove-like part 21 leader line positioning and projecting part 22 coil mounting part 23 standoff 24 engaging part 25 engaging hole 26 terminal

Claims (4)

First and second bobbin halves (2) and (3), which are arranged facing each other and integrated to form a bobbin (1), and are pre-wound to be attached to the bobbin (1). A coil (6), a core (5) having first and second legs (5a, 5b) to be incorporated in each side plate (11) of the bobbin (1), and a back side of the bobbin (1) And a printed circuit board (8) having a Hall element (7) disposed between the gaps of the core (5),
The first bobbin half (2) is formed with a cylindrical core leg insertion portion (16) through which the first leg (5a) of the core (5) is inserted,
The second bobbin half (3) is formed with a cylindrical coil mounting portion (22) in which the core leg insertion portion (16) is inserted and housed, and the coil (6) is mounted on the outer periphery. And
The second leg (5b) of the core (5) is arranged outside the back surface of the bobbin (1), and the Hall element (7) is arranged between the ends of the legs (5b) arranged to face each other. A current sensor characterized by that. 2. The coil body (6c) according to claim 1, wherein the coil (6) separately prepared in advance comprises a coil body (6c) and lead wires (6a, 6b) on both sides thereof, and is wound in a ring shape. Is fitted on the outer periphery of the coil mounting portion (22) in the bobbin (1). 2. The first bobbin (3) according to claim 1, wherein a pair of notch-shaped coil lead wire positioning and projecting portions (21) are formed on the front side of the bottom plate (10A) of the second bobbin (3), and are disposed above the pair. The lead wire (6a, 6b) of the coil (6) is drawn out from the coil lead wire positioning / projecting portion (21) to the outside, and is projected. The bobbin (1) according to claim 1, wherein the bobbin (1) includes a bottom plate (10, 10A), side plates (11) erected on both sides thereof, a front plate (12) located on the front side, and an opposite side. A back plate (14, 14A) provided on the back side of the upper plate and an upper plate (13) covering the upper portion, and a first leg (5a) of the core (5) and the coil leg insertion portion inside (16) A current sensor comprising a coil mounting portion (22) and the coil (6) mounted on the outer periphery of the coil mounting portion (22).

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