JP6495364B2 - Current detector - Google Patents

Description

  The present invention relates to a current detector used for current measurement.

  Conventionally, when a coil is wound around an annular core having a gap for a magnetic sensor as a current detector of this type, the magnetic sensor and the coil are placed on the circumference of the same radius as the circumference of the core on the same surface of the substrate. The arranged prior art is known (for example, refer to Patent Document 1). In this prior art, by setting the coil length to be less than the size of the gap in advance, when the substrate is placed, the coil is placed in the gap, and then the substrate is moved along the circumferential direction of the core so that the core is coiled. Is in a state of penetrating. Then, the magnetic sensor is arranged in the gap by further rotating the substrate around the central axis of the coil.

JP 2013-68490 A

  Since the above prior art performs complicated operations such as movement of the substrate in the circumferential direction of the core and rotation around the coil center axis, the assembly work is complicated. In addition, after the coil and the substrate are accommodated in the housing, the substrate is fixed to the housing using a large number of screw parts, which increases the number of parts and the number of assembling steps, which increases the manufacturing cost.

  Accordingly, an object of the present invention is to provide a technique capable of facilitating work and reducing manufacturing costs.

In order to solve the above problems, the present invention employs the following solutions.
The current detector of the present invention includes a case body provided with a regulating means. An insertion hole is formed on the inside of the case body, and an accommodating portion is formed around the insertion hole. The housing part is a container shape in which one surface of the case main body is opened in the insertion direction of the conductor and the other surface is closed, and the magnetic core and the circuit board housed in the housing part are directly passed through the opening. Although falling off, in the present invention, dropping is regulated by the regulating means.

  The regulation by the regulation means is performed in two steps. That is, the restricting means (1) restricts the rotational displacement of the circuit board or another container accommodated in series with the circuit board, and (2) restricts the dropout through the opening of the circuit board. Therefore, the restriction on rotational displacement also becomes the restriction on dropping, and the circuit board does not drop unless the restriction on rotational displacement is released. Further, since the restricting means is not a separate part but integrated with the case body, it can be formed as a part of the case body.

  If the regulation (1) and (2) is regulated by the regulating means, the assembly will be facilitated at the time of manufacture. That is, in the assembly process, since the restriction (2) has not been made yet, the circuit board can be easily inserted through the opening of the case body. From this state, if the circuit board or other container is rotationally displaced until the regulation (1) by the regulation means functions effectively, the regulation (1) and (2) are both regulated by the regulation means. It becomes effective, and the dropping of the circuit board is constantly regulated. Therefore, assembly work can be realized without using separate parts such as screws.

  The restricting means may include a protruding portion formed to protrude from the inner surface of the case main body into the accommodating portion. In this case, the restrictions (1) and (2) are applied by contacting the projecting portion with the edge of the circuit board or other container in the housed state. This also means that the assembly work is easy as follows. That is, during the assembly process, the circuit board is inserted through the opening of the case body, and from this state, the circuit board or other container can be rotationally displaced until the protruding portion contacts the edge of the circuit board or other container. For example, the above restrictions (1) and (2) due to the protruding portion are both effective, and the circuit board is constantly restricted from falling off.

  Further, the restricting means may include a rib-like portion formed so as to protrude from the inner surface of the case main body along one surface forming the opening. In this case, the restriction (2) is applied by the rib-shaped portion contacting the outer surface of the circuit board in the accommodated state. As described above, since the dropping of the circuit board is regulated by the rib-shaped portion integrally formed with the case main body along the opening, the number of components can be reduced. In addition, the rib-shaped portion exerts the restriction (2), thereby ensuring a constant distance from the opening surface to the outer surface of the circuit board. For this reason, the insulation distance (standard distance) from the conductor inserted in the insertion hole to the circuit board can be ensured as desired, and the safety of the product can be improved.

  When the restricting means includes the rib-shaped portion, the circuit board has a cutout portion that is not brought into contact with the rib-shaped portion in a state where the circuit board is rotationally displaced against the restriction (1). In this state, the circuit board is allowed to drop through the opening by relatively receiving the rib-shaped portion in the notch.

  In other words, the rib-shaped portion is effective in the restriction (2) as the restriction (1) is effective. Therefore, the regulation (2) is not made. This also means that the assembly work is easy as follows. For example, in the assembly process, when the circuit board is inserted through the opening of the case main body, the orientation of the circuit board relative to the case main body is determined from the positional relationship between the notch and the rib-shaped portion. Can be easily determined. In other words, the circuit board can be inserted into the case body (reverse of dropping) by accepting the rib-shaped portion in the notch, so the circuit board is mounted on the case body unless these positional relationships are properly matched. Can't insert. Thereby, the misalignment at the time of an assembly operation can be prevented, and workability can be improved.

  According to the present invention, it is possible to facilitate work and reduce manufacturing costs.

It is the schematic which shows the structure of the current detector of 1st Embodiment. It is the schematic which shows the structure of the current detector of 1st Embodiment. It is a disassembled perspective view of the current detector of 1st Embodiment. It is the front view which showed the state by which the drop-off | omission of a circuit board and a magnetic body core is not controlled. It is the front view which showed the state in which drop-off | omission of a circuit board and a magnetic body core is controlled. It is the fragmentary perspective view which showed in detail the control | control of the rotation displacement of the circuit board by a protrusion part. It is the fragmentary perspective view which showed in detail the control | control of the rotation displacement of the circuit board by a protrusion part. It is the perspective view which showed the electric current detector of 1st Embodiment in the state of flat placement. It is the schematic which shows the structure of the current detector of 2nd Embodiment. It is the schematic which shows the structure of the current detector of 2nd Embodiment. It is a disassembled perspective view of the current detector of 2nd Embodiment. It is the disassembled perspective view which showed the positional relationship of a circuit board and a case main body in the state where drop-off is not controlled. It is the front view which showed the process which changes to the state from which the rotational displacement and drop-off | omission of the circuit board were not controlled to the controlled state. It is the front view which showed the process which changes to the state from which the rotational displacement and drop-off | omission of the circuit board were not controlled to the controlled state. It is the perspective view which showed the electric current detector of 2nd Embodiment in the state of flat placement. It is the schematic which shows the structure of the current detector of 3rd Embodiment. It is the schematic which shows the structure of the current detector of 3rd Embodiment. It is a disassembled perspective view of the current detector of 3rd Embodiment. It is a front view which shows the restriction | limiting state of the circuit board using a ring cover, and a magnetic body core. FIG. 20 is a cross-sectional view of the current detector along the line XX-XX in FIG. 19. It is a fragmentary sectional view which follows the XXI-XXI line | wire in FIG. It is a continuous view which shows the operation | movement for performing regulation using a ring cover. It is a continuous view which shows the operation | movement for performing regulation using a ring cover. It is the fragmentary perspective view which showed the example in the case of rotating a ring cover and setting it as a control state. It is the fragmentary perspective view which showed the example in the case of making a ring cover into a control state only by simple insertion.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
1 and 2 are schematic views showing the configuration of the current detector 100 of the first embodiment. FIG. 1 is a perspective view showing the current detector 100 from the front side, and FIG. 2 is a perspective view showing from the back side. Hereinafter, the configuration of the current detector 100 of the first embodiment will be described.

[Case body]
The current detector 100 includes a case body 102 made of resin, for example. The case main body 102 constitutes an external form of the current detector 100, and a conductor (not shown) through which a current to be detected, which is the main purpose, is inserted, or for any object (also not shown). It performs a fixed function. In addition, a magnetic core (not visible in FIGS. 1 and 2) and a circuit board 114 are accommodated in the case main body 102. Note that the inside of the case body 102 may be filled and sealed with potting resin or the like, but the illustration is omitted here (the same applies hereinafter). Further, the circuit board 114 is provided with a connector 108 protruding from the outer surface on the front side.

  The case main body 102 has an approximately ring shape as a whole, and an insertion hole 104 is formed through the central portion in the thickness direction (front-rear direction). In the standing posture shown in FIGS. 1 and 2, curved portions are conspicuous on the upper and lower surfaces and both side surfaces of the case body 102, but each surface has a shape having a flat portion in addition to the curved portions. ing.

  In addition, the case main body 102 is formed with an accommodating portion 102 g around the insertion hole 104. The housing portion 102g is a container shape in which one surface (front surface in FIG. 1) viewed in the penetration direction (conductor insertion direction) of the insertion hole 104 is entirely open and the other surface (rear surface in FIG. 2) is closed. I am doing. The circuit board 114 and the magnetic core are inserted through the opening of the housing portion 102g.

  In addition, the case main body 102 includes an upper bracket 102a, a bottom plate bracket 102b, a lower bracket 102c, and the like, which form a pair, in order to be fixed to an object (such as a casing of a device through which a detected current flows) as described above. Is formed. The upper bracket 102a and the lower bracket 102c are respectively positioned at the four corners on the outer side of the case main body 102 with the insertion hole 104 at the center. Further, the pair of bottom plate brackets 102b on both sides extend in a blade shape from the bottom surface of the case body 102 toward both sides.

  Among these, the upper bracket 102a and the lower bracket 102c are used when the case main body 102 is fixed to an object on the back surface. The bottom plate bracket 102b is used when the case main body 102 is fixed to an object on the bottom surface. In any case, each bracket 102a, 102b, 102c is formed with a hole through which any fastener (bolt, nut, boss, etc.) can be inserted.

[Magnetic core]
FIG. 3 is an exploded perspective view of the current detector 100 according to the first embodiment. As described above, the current detector 100 includes the magnetic core 110 and the circuit board 114, which are accommodated in the accommodating portion 102g of the case main body 102. For this reason, the case main body 102 is formed with a receiving portion 102g in a concave shape (container shape) from the front side toward the back side, and the holding portion 102g is formed in an annular shape around the insertion hole 104 as a whole. . The magnetic core 110 is accommodated in the accommodating portion 102g so as to surround the insertion hole 104. In the first embodiment, the magnetic core 110 has a secondary winding 110c, and most of the outer shape shown in FIG. 3 is occupied by the secondary winding 110c. The magnetic core 110 has a ring core 110b (for example, a toroidal ring) made of a magnetic material inside the secondary winding 110c, and an air gap is formed in a part thereof. A hall element 130 is disposed in the air gap via a spacer 110a. Note that the Hall element 130 is mounted on the circuit board 114 in a completed state.

[Circuit board]
The current detector 100 has the circuit board 114 described above, and this circuit board 114 is also housed in the housing portion 102 g of the case body 102 together with the magnetic core 110. An opening 114a is formed at the center of the circuit board 114, and in the accommodated state, the wall plate portion 102d around the insertion hole 104 can be received in the opening 114a. Further, the magnetic core 110 is provided with bosses 110d at a plurality of locations (three locations) in the circumferential direction, and the magnetic core 110 is fixed to the circuit board 114 via the bosses 110d. In addition, a current detection circuit is formed on the circuit board 114 by mounting various electronic components together with the connector 108 and the Hall element 130 described above.

(Drop-off control structure)
As described above, the magnetic core 110 and the circuit board 114, which are the main components of the current detector 100, are accommodated in the accommodating portion 102g of the case main body 102. The use of other parts such as the circuit board 114 and the magnetic core 110 are prevented from dropping from the case body 102. Hereinafter, this point will be described in detail.

[Non-regulated state]
FIG. 4 is a front view showing a state in which the dropout of the circuit board 114 and the magnetic core 110 is not restricted. In this state, the circuit board 114 and the magnetic core 110 can be easily removed through the opening of the case body 102. That is, the circuit board 114 is merely inserted through the wall plate portion 102d around the insertion hole 104 into the central opening 114a, and is not particularly fixed to the case body 102.

  On the circuit board 114, two edge sides 114b and 114c are formed at the peripheral portions in four directions opposite to the inner surfaces of the upper and lower sides and both sides of the case main body 102, respectively. These two edges 114b and 114c are not on the same line and intersect each other at a constant angle (obtuse angle). As shown in FIG. 4, in a state where the drop-off of the circuit board 114 and the magnetic core 110 is not regulated, one edge 114 b is substantially parallel to the inner wall surface of the case main body 102 in the peripheral portion in the four directions. It becomes a relative positional relationship. Further, the other edge 114 c is in a positional relationship facing the inner wall surface of the case body 102 while being inclined.

  In the case body 102, ribs 102h are integrally formed on the upper and lower and right inner surfaces as viewed in FIG. 4, and ribs 102h are also integrally formed on the inner surface of the lower left corner. Among these, the three ribs 102h located on the upper and lower and right inner surfaces are at positions facing the edge 114c of the circuit board 114, but none of these three ribs 102h are in contact with the edge 114c. Further, the rib 102h located at the lower left corner is formed with a notch 114d at the edge of the circuit board 114 opposite to the rib 102h. In the positional relationship shown in FIG. 4, the rib 102h is just in the notch 114d. Accepted (entered).

  Therefore, the circuit board 114 is free to some extent in the case main body 102 (accommodating portion 102g), and the rotational displacement indicated by the arrow in FIG. 4 is not restricted. In other words, in the assembly operation of the current detector 100 of the first embodiment, the circuit board 114 and the magnetic core 110 may be inserted into the housing portion 102g of the case body 102 from the positional relationship shown in FIG. it can. Note that the positional relationship between the case body 102, the circuit board 114, and the magnetic core 110 shown in FIG. 4 matches the positional relationship shown in FIG.

[Regulated status]
FIG. 5 is a front view showing a state in which the circuit board 114 and the magnetic core 110 are prevented from falling off. When the circuit board 114 and the magnetic core 110 are rotated clockwise from the state shown in FIG. 4, the state shown in FIG. 5 is obtained. In this state, the rotational displacement of the circuit board 114 is also restricted, and the drop of the circuit board 114 and the magnetic core 110 is restricted along with this restriction.

  At this time, the circuit board 114 has a positional relationship in which the other edge 114c is substantially parallel to the inner wall surface of the case main body 102 at the peripheral portions in the four directions. One edge 114b, which is substantially parallel to the inner wall surface of the case body 102 in an unregulated state (FIG. 4), is in a positional relationship facing the inner wall surface of the case body 102 while being inclined. I understand that.

  Also, the four ribs 102h of the case body 102 are all in contact with the outer surface of the circuit board 114 (mounting surface of the connector 108), whereby the circuit board 114 and the magnetic core 110 are separated from the case body 102. It can be seen that the dropout is definitely regulated. Further, the notch 114d that has received the rib 102h at the lower left corner position in an unregulated state (FIG. 4) has moved to a position spaced apart from the rib 102h in the circumferential direction in accordance with the rotational displacement of the circuit board 114. Therefore, the rib 102h cannot be received in the notch 114d.

  Here, at the position of the upper right corner of the case main body 102, a triangular protruding portion 102k is integrally formed in a front view. When the shortest of the three sides is the bottom side, the protruding portion 102k is inclined so that the surface surrounded by the three sides rises from the bottom side toward the apex. Here, “climbing slope” means that the bottom side is located at the innermost position in the housing portion 102g, and the long side is located at the foremost side (front opening side) in the housing portion 102g. Accordingly, the protruding portion 102k is in a state of protruding from the inner surface of the case main body 102 to the opening side in the housing portion 102g.

  Further, in the protruding portion 102k, a portion along one side closer to the inside of the case body 102 of the two long sides is in contact with the edge 114b of the circuit board 114. At this time, since the protruding portion 102k has the above-mentioned “climbing slope”, a portion along one side closer to the inside of the case body 102 is between the inner surface of the case body 102 hidden behind the circuit board 114 (edge 114b). There is a step. The protruding portion 102k is in contact with the edge 114b at the stepped portion, so that the protruding portion 102k regulates the rotational displacement (counterclockwise direction) of the circuit board 114.

[Details of protrusions]
6 and 7 are partial perspective views showing in detail the regulation of the rotational displacement of the circuit board 114 by the protruding portion 102k. Among these, the state shown in FIG. 6A matches the positional relationship shown in FIG. 4, and the state shown in FIG. 7D matches the positional relationship shown in FIG. Other (B) in FIG. 6 and (C) in FIG. 7 show a state on the way from before the regulation to after the regulation.

[Pre-regulation status]
In FIG. 6, (A): the circuit board 114 is not restricted from rotational displacement and dropout. In this state, the edge 114b of the circuit board 114 and the protruding portion 102k are not in contact with each other. In addition, the form of the “climbing slope” and the “step” of the protruding portion 102k can be visually recognized here. Further, the circuit board 114 has a corner portion 114e formed at the end of the edge 114b, and the corner portion 114e is located away from the protruding portion 102k. From this point, when the circuit board 114 is rotationally displaced in the direction of the arrow (clockwise) in the figure, the following state is obtained.

[Intermediate state (1)]
(B) in FIG. 6: The rotational displacement of the circuit board 114 is not yet restricted. However, due to the rotational displacement of the circuit board 114, the edge 114b (corner portion 114e) rides on the inclined surface (“climbing inclination”) of the protruding portion 102k. At this time, the rib 102h is already in contact with the outer surface of the circuit board 114 on the right side of the inner surface of the case main body 102 (the edge 114c enters the inner side of the rib 102h). Although not shown in the figure, the other three ribs 102h are also in contact with the outer surface of the circuit board 114, so that dropping from the opening of the circuit board 114 has already started to be regulated. For this reason, when the edge 114 b (corner portion 114 e) rides on the inclined surface (“climbing inclination”) of the protruding portion 102 k, a certain amount of bending deformation occurs in the circuit board 114. Occurs for displacement.

[Intermediate state (2)]
In FIG. 7, (C): Due to the further rotational displacement of the circuit board 114, the edge 114b (corner portion 114e) greatly rides on the inclined surface (“climbing inclination”) of the protruding portion 102k. Since the restriction by the ribs 102h has already been effective, the amount of bending deformation of the circuit board 114 increases as the riding on the inclined surface of the protruding portion 102k progresses, and the drag also increases.

[Regulated status]
In FIG. 7, (D): the circuit board 114 is restricted from rotational displacement and dropout. In this state, the edge 114b (corner portion 114e) of the circuit board 114 has completely passed over (passed through) the inclined surface of the protruding portion 102k. If the protruding portion 102k is overcome, the circuit board 114 is released from the bending deformation corresponding to the step by the restoring force, and the edge 114b is in contact with the protruding portion 102k at the step portion. Even when the circuit board 114 receives a force in the counterclockwise direction, the edge 114b is caught by the step of the protruding portion 102k, and the rotational displacement in the counterclockwise direction is reliably restricted. Further, the corner portion 114e is in contact with the inner surface of the case main body 102, and further rotational displacement in the clockwise direction is restricted. Therefore, the rotational displacement of the circuit board 114 around the insertion hole 104 is regulated in both directions. As the rotational displacement of the circuit board 114 is restricted, the restriction of the circuit board 114 and the magnetic core 110 from being detached from the case body 102 by the rib 102h is in effect.

[Securing insulation distance]
FIG. 8 is a perspective view showing the current detector 100 in a flat state. Here, it is assumed that the circuit board 114 and the magnetic core 110 are prevented from dropping from the case body 102.

  In addition to restricting the circuit board 114 and the magnetic core 110 from dropping from the case body 102, the rib 102h secures a distance (dimension H in the figure) from the opening surface of the case body 102 to the outer surface of the circuit board 114. It also contributes to doing. This distance H ensures the insulation distance from a conductor (not shown) inserted through the insertion hole 104 to various electronic components on the circuit board 114, thereby improving the safety of the current detector 100. Greatly improved.

As described above, according to the current detector 100 of the first embodiment, the following advantages can be obtained.
(1) Since the projecting portion 102k and the rib 102h are integrally formed on the case main body 102, the circuit board 114 and the magnetic core 110 can be prevented from falling off, so that separate parts (fasteners such as screws) are used to prevent the falling off. There is no need to use it, and the number of parts and the manufacturing cost can be reduced.

(2) At the time of assembling work, the position of the notch 114d of the circuit board 114 is matched with the rib 102h at the lower left corner position of the case body 102, so that the proper positional relationship can be easily achieved. Thus, errors during assembly work (time loss) can be prevented.

(3) Since the circuit board 114 is locked only by inserting the circuit board 114 into the case main body 102 and rotating it in one direction (clockwise direction), the assembling operation can be completed quickly. Therefore, work efficiency is greatly improved.
(4) Further, since the clear click feeling (resistance feeling when the corner portion 114e gets over the inclined surface of the projecting portion 102k) is obtained when the circuit board 114 is locked, the assembling work can be easily performed.

[Second Embodiment]
Next, a second embodiment will be described.
9 and 10 are schematic diagrams illustrating the configuration of the current detector 200 according to the second embodiment. FIG. 9 is a perspective view showing the current detector 200 from the front side, and FIG. 10 is a perspective view showing from the back side. Hereinafter, the configuration of the current detector 200 of the second embodiment will be described.

[Case body]
The current detector 200 includes a case body 202 made of resin, for example. The case main body 202 constitutes an external form of the current detector 200, and a conductor (not shown) through which a current to be detected, which is the main purpose, is inserted, or for any object (also not shown). It performs a fixed function. In addition, a magnetic core (not visible or omitted in FIGS. 9 and 10) and a circuit board 214 are accommodated inside the case main body 202. Note that the inside of the case main body 202 may be filled and sealed with potting resin or the like, but the illustration is omitted here (the same applies hereinafter). Further, the circuit board 214 is provided with a connector 208 protruding from the outer surface on the front side.

  The case main body 202 has an approximately ring shape (trapezoidal shape in a rear view) as a whole, and an insertion hole 204 is formed through the center portion in the thickness direction (front-rear direction). In the standing posture shown in FIGS. 9 and 10, curved portions are conspicuous on the lower surface and both side surfaces of the case main body 202, but the upper surface has a flat surface.

  The case main body 202 is formed with an accommodating portion 202 g around the insertion hole 204. The container 202g has a container shape in which one surface (front surface in FIG. 9) viewed in the penetrating direction (conductor insertion direction) of the insertion hole 204 is entirely open and the other surface (rear surface in FIG. 10) is closed. I am doing. The circuit board 214 and the magnetic core are inserted through the opening of the housing portion 202g.

  In addition, the case main body 202 includes a pair of an upper bracket 202a, a bottom plate bracket 202b, a lower bracket 202c, and the like for fixing to an object (such as a housing of a device through which a current to be detected flows) as described above. Is formed. The upper bracket 202a and the lower bracket 202c are respectively positioned at the four corners on the outer side of the case body 202 with the insertion hole 204 at the center. Further, the pair of bottom plate brackets 202b on both sides extend in a blade shape from the bottom surface of the case body 202 toward both sides.

  Among these, the upper bracket 202a and the lower bracket 202c are used when the case main body 202 is fixed to an object on the back surface. The bottom plate bracket 202b is used when the case main body 202 is fixed to an object on the bottom surface. In any case, each bracket 202a, 202b, 202c is formed with a hole through which any fastener (bolt, nut, boss, etc.) can be inserted.

[Magnetic core]
FIG. 11 is an exploded perspective view of the current detector 200 according to the second embodiment. As described above, the current detector 200 includes the magnetic core 210 and the circuit board 214, which are accommodated in the accommodating portion 202g of the case main body 202. For this reason, the housing portion 202g is formed in the case main body 202 in a concave shape (container shape) from the front side to the back side, and the housing portion 202g as a whole has an annular shape around the insertion hole 204. . The magnetic core 210 is accommodated in the accommodating portion 202g so as to surround the insertion hole 204. In the second embodiment, the magnetic core 210 is of the type having the secondary winding 210c, and most of the outer shape shown in FIG. 11 is occupied by the secondary winding 210c. The magnetic core 210 has a ring core 210b (for example, a toroidal ring) made of a magnetic material inside the secondary winding 210c, and an air gap is formed in a part thereof. A Hall element 230 is disposed in the air gap via a spacer 210a. The hall element 230 is mounted on the circuit board 214.

[Circuit board]
The current detector 200 has the circuit board 214 described above, and this circuit board 214 is also housed in the housing portion 202 g of the case body 202 together with the magnetic core 210. An opening 214a is formed at the center of the circuit board 214, and in the accommodated state, the wall plate 202d around the insertion hole 204 can be received in the opening 214a. The spacer 210a is provided with two bosses 210d, and the magnetic core 210 is fixed to the circuit board 214 via the bosses 210d. In addition, a current detection circuit is formed on the circuit board 214 by mounting various electronic components together with the connector 208 and the Hall element 230 described above.

(Drop-off control structure)
As described above, the magnetic core 210 and the circuit board 214, which are the main components of the current detector 200, are accommodated in the accommodating portion 202g of the case body 202, but also in the second embodiment, The removal of the circuit board 214 and the magnetic core 210 from the case main body 202 is regulated without using another component such as a screw. Hereinafter, this point will be described in detail.

  FIG. 12 is an exploded perspective view showing the positional relationship between the circuit board 214 and the case main body 202 in a state where the drop-off is not regulated. In the following, illustration of the magnetic core 210 is omitted in order to prevent complication.

  The case main body 202 has a cylindrical wall plate portion 202 d around the insertion hole 204. The wall plate portion 202d is integrally formed with three ribs 202h, and these ribs 202h protrude radially into the housing portion 202g. Further, when viewed in the circumferential direction, the three ribs 202h are arranged not at regular intervals but at irregular intervals.

  The circuit board 214 has a notch 214d at a position corresponding to the three ribs 202h. These notches 214d can relatively accept the corresponding ribs 202h. Therefore, when the current detector 100 is assembled, the circuit board 214 can be inserted into the case body 202 by appropriately matching the positional relationship between the notch 214d of the circuit board 214 and the rib 202h of the case body 202.

  Further, in the case main body 202, substrate supports 202p and 202q are integrally formed at a position deeper than the rib 202h in the insertion direction of the circuit substrate 214. These board supports 202p and 202q are in contact with one mounting surface of the circuit board 214 inserted into the case main body 202, thereby positioning the circuit board 214 within the housing portion 202g.

  Further, a projecting portion 202k is integrally formed at one location on the inner surface of the case main body 202. The protruding portion 202k is in a state of protruding from the inner surface of the case main body 202 into the housing portion 202g. On the other hand, in the circuit board 214, a recessed portion 214e is formed at a position corresponding to the protruding portion 202k in a restricted state (completed state), and a guide edge 214b is formed at a position continuous with the recessed portion 214e.

  FIGS. 13 and 14 are front views showing a process of transition from a state where the rotational displacement and dropout of the circuit board 214 (including the magnetic core 210; the same applies hereinafter) are not restricted to a restricted state. Among these, (A) in FIG. 13 shows a state where dropping is not regulated, and (D) in FIG. 14 shows a state where rotational displacement and dropping are regulated. (B) in FIG. 13 and (C) in FIG. 14 show a state in the middle.

[Non-regulated state]
13A: In this state, the circuit board 214 can be easily dropped through the opening of the case body 202. FIG. That is, the circuit board 214 is merely inserted through the wall plate 202d around the insertion hole 204 into the central opening 214a, and is not particularly fixed to the case body 202.

  The three ribs 202h are located at (accepted to) the corresponding notches 214d of the circuit board 214, and all the three ribs 202h are in contact with the mounting surface of the circuit board 214. Absent.

  Therefore, the circuit board 214 is free to some extent in the case main body 202 (accommodating portion 202g), and the rotational displacement indicated by the arrow in the figure is not restricted. In other words, when assembling the current detector 200 according to the second embodiment, the circuit board 214 can be inserted into the housing portion 202g of the case body 202 in the positional relationship shown in FIG. . The positional relationship between the case main body 202, the circuit board 214, and the magnetic core 210 shown in FIG. 13A matches the positional relationship shown in FIGS.

[Intermediate state (1)]
13B: When the circuit board 214 is rotated clockwise from the state shown in FIG. 13A, the three ribs 202h are in contact with the mounting surface of the circuit board 214. Therefore, the removal of the circuit board 214 has already been regulated from this state. At the periphery of the circuit board 214, the guide edge 214b is in contact with the protruding portion 202k on the inner surface of the case body 202. At this time, the guide edge 214b is caught at a position before the recess 214e in the rotation direction, and a certain amount of reaction force (drag) is generated.

[Intermediate state (2)]
In FIG. 14C, the circuit board 214 is retracted inward in the radial direction when the circuit board 214 is further rotated while receiving a reaction force due to the catch between the guide edge 214b and the protruding portion 202k. 214 is deformed.

[Regulated status]
14D: When the circuit board 214 is rotated until the guide edge 214b passes the protruding portion 202k, the concave portion 214e reaches the position of the protruding portion 202k, and the protruding portion 202k is received in the concave portion 214e. It becomes. In this state, the projecting portion 202k and the recess 214e are in a fitting relationship, and the rotational displacement of the circuit board 214 is restricted. As a result, the circuit board 214 is also prevented from dropping through the opening by the rib 202h.

[Securing insulation distance]
FIG. 15 is a perspective view showing the current detector 200 in a flat state. Here, it is assumed that dropping of the circuit board 214 and the magnetic core 210 from the case body 202 is restricted.

  In addition to restricting the circuit board 214 from dropping from the case main body 202, the rib 202h contributes to securing a distance (dimension H in the drawing) from the opening surface of the case main body 202 to the outer surface of the circuit board 214. To do. This distance H ensures the insulation distance from a conductor (not shown) inserted through the insertion hole 204 to various electronic components on the circuit board 214, thereby improving the safety of the current detector 200. Greatly improved.

As described above, according to the current detector 200 of the second embodiment, the following advantages can be obtained.
(1) Since the projecting portion 202k and the rib 202h are integrally formed on the case main body 202, the circuit board 214 and the magnetic core 210 can be prevented from falling off, so that separate parts (fasteners such as screws) are used to prevent the falling off. There is no need to use it, and the number of parts and the manufacturing cost can be reduced.

(2) During assembly work, the positions of the three notches 214d of the circuit board 214 are matched with the corresponding three ribs 202h of the case main body 202, so that the proper positional relationship can be easily achieved. Thus, errors during assembly work (time loss) can be prevented.

(3) Since the circuit board 214 is locked only by inserting the circuit board 214 into the case main body 202 and rotating it in one direction (counterclockwise direction), the assembling operation can be completed quickly. Therefore, work efficiency is greatly improved.
(4) Further, when the circuit board 214 is locked, a clear click feeling (resistance when the guide edge 214b passes through the protruding portion 202k and the protruding portion 202k is received by the concave portion 214e) can be obtained. It can be carried out.

[Third Embodiment]
Next, a third embodiment will be described.
16 and 17 are schematic views showing the configuration of the current detector 300 of the third embodiment. 16 is a perspective view showing the current detector 300 from the front side, and FIG. 17 is a perspective view showing the current detector 300 from the back side. Hereinafter, the configuration of the current detector 300 of the third embodiment will be described.

[Case body]
The current detector 300 includes a case body 302 made of, for example, resin. The case main body 302 constitutes an external form of the current detector 300, and a conductor (not shown) through which a current to be detected, which is the main purpose, is inserted, or for any object (also not shown). It performs a fixed function. In addition, a magnetic core 310 (not visible in FIG. 17) and a circuit board 314 are accommodated in the case main body 302. Note that the inside of the case main body 302 may be filled and sealed with potting resin or the like, but the illustration is omitted here (the same applies hereinafter). Further, the circuit board 314 is provided with a connector 308 protruding from the outer surface on the front side.

  The case main body 302 has an approximately ring shape as a whole, and an insertion hole 304 is formed through the central portion in the thickness direction (front-rear direction). In the standing posture shown in FIGS. 16 and 17, curved portions are conspicuous on the upper surface of the case body 302, but in addition to the curved portions on both side surfaces and the lower surface, a shape having a flat portion is formed.

  In addition, the case main body 302 is formed with an accommodating portion 302 g around the insertion hole 304. The container 302g is a container shape in which one surface (front surface in FIG. 16) viewed in the penetration direction (conductor insertion direction) of the insertion hole 304 is entirely open and the other surface (rear surface in FIG. 17) is closed. I am doing. The circuit board 314 and the magnetic core are inserted through the opening of the housing portion 302g.

  In addition, the case main body 302 includes a pair of an upper bracket 302a, a bottom plate bracket 302b, a lower bracket 302c, and the like for fixing to an object (such as a casing of a device in which a current to be detected flows) as described above. Is formed. The upper bracket 302a and the lower bracket 302c are respectively positioned at the four corners on the outer side of the case body 302 with the insertion hole 304 at the center. Further, the pair of bottom plate brackets 302b on both sides extend in a blade shape from the bottom surface of the case body 302 toward both sides.

  Among these, the upper bracket 302a and the lower bracket 302c are used when the case main body 302 is fixed to an object on the back surface. The bottom plate bracket 302b is used when the case main body 302 is fixed to an object on the bottom surface. In any case, each bracket 302a, 302b, 302c is formed with a hole through which any fastener (bolt, nut, boss, etc.) can be inserted.

[Magnetic core]
FIG. 18 is an exploded perspective view of the current detector 300 according to the third embodiment. As described above, the current detector 300 includes the magnetic core 310 and the circuit board 314, which are accommodated in the accommodating portion 302g of the case main body 302. For this reason, the case main body 302 is formed with a storage portion 302g in a concave shape (container shape) from the front side to the back side, and the storage portion 302g as a whole forms an annular shape around the insertion hole 304. . The magnetic core 310 is accommodated in the accommodating portion 302g so as to surround the insertion hole 304. Also in the third embodiment, the magnetic core 310 has a secondary winding 310c, and most of the outer shape shown in FIG. 18 is occupied by the secondary winding 310c. The magnetic core 310 has a ring core made of a magnetic material (for example, a toroidal ring: not visible in FIG. 18) inside the secondary winding 310c, and an air gap is formed in a part thereof. A hall element 330 is arranged in the air gap via a spacer (not shown). Note that the Hall element 330 is mounted on the circuit board 314 in a completed state.

[Circuit board]
Further, the current detector 300 has the circuit board 314 described above, and this circuit board 314 is also housed in the housing portion 302 g of the case main body 302 together with the magnetic core 310. The circuit board 314 is formed with a U-shaped notch 314a that matches the outer shape of the insertion hole 304 (wall plate portion 302d). In the housed state, the wall plate around the insertion hole 304 is in the notch 314a. The part 302d can be received. Further, the magnetic core 310 is provided with bosses (not shown) at a plurality of locations (three locations) in the circumferential direction, and the magnetic core 310 is fixed to the circuit board 314 via these bosses. In addition, a current detection circuit is formed on the circuit board 314 by mounting various electronic components together with the connector 308 and the Hall element 330 described above.

[Other containers]
In the case of the third embodiment, the ring cover 320 is accommodated in the case main body 302 (accommodating portion 302g) in addition to the magnetic core 310 and the circuit board 314. The ring cover 320 is connected to the circuit board 314 and accommodated in the accommodating portion 302g, so that the ring cover 320 itself is restricted from rotational displacement, and accordingly, the circuit board 314 and the magnetic core 310 are also prevented from dropping off. First, the shape and the like of the ring cover 320 will be described.

  The ring cover 320 has a ring shape as a whole, and the center portion is an opening that matches the insertion hole 304. An inner sleeve 320a is formed in a cylindrical shape surrounding the opening. Although not visually recognized in FIG. 18, an outer sleeve is formed outside the inner sleeve 320a with a space therebetween, and the inner sleeve 320a and the outer sleeve have a double cylindrical shape.

  The ring cover 320 has a flange portion 320f formed on the outer side of the inner sleeve 320a, and a rim portion 320g formed on the periphery of the flange portion 320f. A lock arm 320b and a handle 320d are formed on the outer surface of the rim portion 320g at intervals in the circumferential direction. The lock arm 320b and the handle 320d are separated from each other by about 90 ° in the circumferential direction. Both the lock arm 320b and the handle 320d are formed to protrude outward in the radial direction, and a restriction piece 320c is formed at the tip of the lock arm 320b. The restricting piece 320c extends in the outer tangent direction of the ring cover 320 at the tip of the lock arm 320b.

[Regulatory structure]
FIG. 19 is a front view showing a restricted state of the circuit board 314 and the magnetic core 310 using the ring cover 320.

  As described above, the ring cover 320 is accommodated in the case main body 302 (accommodating portion 302g) together with the circuit board 314 and the magnetic core 310. In this accommodated state, the lock arm 320b extends to the immediate vicinity of the inner surface of the case main body 302, and is further in contact with the inner surface of the case main body 302 by a restriction piece 320c at the tip. On the other hand, a protruding portion 302k is integrally formed on the inner surface of the case main body 302 at a position facing the restriction piece 320c, and the protruding portion 302k is located closer to the opening surface of the case main body 302 than the restriction piece 320c. Yes. In this state, the ring cover 320 is restricted from rotational displacement in the circumferential direction of the insertion hole 304, and is also restricted from falling off the opening.

  20 is a cross-sectional view of the current detector 300 along the line XX-XX in FIG. FIG. 21 is a partial cross-sectional view taken along line XXI-XXI in FIG. 20 and 21, the front of the current detector 300 is shown upward.

  The ring cover 320 is fitted to the wall plate portion 302d of the case body 302 by the inner sleeve 320a and the outer sleeve 320e, and the insertion hole 304 can be rotationally displaced in the circumferential direction at this portion. However, as apparent from the cross sections shown in FIGS. 20 and 21, the ring cover 320 is in contact with the inner surface of the case main body 302 by a regulation piece 320 c at the tip of the lock arm 320 b, and thus the ring cover 320 is The rotational displacement is regulated.

  Further, as is apparent from the cross section shown in FIG. 21, the protruding portion 302k is located closer to the opening surface than the restricting piece 320c, and the protruding portion 302k restricts displacement of the restricting piece 320c in the opening direction. As a result, the ring cover 320 is also prevented from dropping through the opening of the case body 302. As a result, it can be seen that the circuit board 314 and the magnetic core 310 are also prevented from dropping through the opening of the case body 302 by the ring cover 320.

  22 and 23 are continuous diagrams showing an operation for performing the regulation using the ring cover 320. FIG. In the following, FIG. 19 is also referred to as appropriate.

  22A: In the third embodiment, the ring cover 320 is also accommodated in a state where the magnetic core 310 and the circuit board 314 are accommodated in the case main body 302 (accommodating portion 302g) as described above. For this reason, in the assembly process, the circuit board 314 and the magnetic core 310 are first accommodated in the case main body 302, and then the ring cover 320 is accommodated. At this time, the ring cover 320 is accommodated in a state where the lock arm 320b is not in contact with the inner surface of the case body 302 as shown in the figure. Thereafter, the ring cover 320 is rotated using the handle 320d or the like in the direction of the arrow (clockwise direction) in the drawing.

  In FIG. 22 (B): When the ring cover 320 is rotated to some extent, the regulating piece 320c first comes into contact with the inner surface of the case body 302. At this time, since the regulation piece 320c has a flat plate shape, the regulation piece 320c is caught with respect to rotation from there, and a certain amount of reaction force (drag) is produced.

  FIG. 23: When the ring cover 320 is further rotated while receiving a reaction force due to the restriction piece 320 c being caught on the inner surface of the case body 302, the restriction piece 320 c is bent and deformed along the inner surface of the case body 302. Accordingly, the reaction force due to the restriction piece 320c is further increased.

[See FIG. 19]
Thereafter, when the ring cover 320 is rotated until the restricting piece 320c is in contact with the inner surface of the case body 302 as a whole, the rotation of the ring cover 320 is restricted at that position. In this state, the rotational displacement of the ring cover 320 is regulated in both directions.

  In addition, in 3rd Embodiment, it can also be set as a control state only by inserting, without rotating the ring cover 320. FIG. Hereinafter, this point will be described.

(Rotation lock)
First, FIG. 24 is a partial perspective view showing an example in a case where the ring cover 320 is rotated to be in a restricted state.
In FIG. 24A, as described above, when the ring cover 320 is rotated, the regulating piece 320c is displaced in the rotational direction with the inner surface of the case body 302 being in contact therewith.
In FIG. 24 (B): The restricting piece 320c comes into contact with the inner surface of the case main body 302 in parallel to enter a restricted state.

(Insertion lock)
Next, FIG. 25 is a partial perspective view showing an example in which the ring cover 320 is brought into a restricted state only by simple insertion. When the ring cover 320 is simply inserted, the positional relationship in the circumferential direction of the insertion hole 304 is adjusted to the position shown in FIG. 19 from the beginning. When the ring cover 320 is inserted into the case main body 302 in this state, the restricting piece 320c is pushed in the insertion direction while facing the protruding portion 302k as shown in FIG. At this time, since the protruding portion 302k is inclined upward in the insertion direction, a certain amount of reaction force (drag) is generated against the insertion of the ring cover 320. When the ring cover 320 is further inserted while receiving this reaction force, the restriction piece 320c eventually passes through the inclined surface of the projecting portion 302k, and the restriction state shown in FIG. In this state, the ring cover 320 is restricted from rotational displacement and also from falling off through the opening. As a result, dropping off of the circuit board 314 and the magnetic core 310 is also restricted.

[Securing insulation distance]
In the third embodiment, the ring cover 320 not only regulates the dropout of the circuit board 314 from the case body 302, but also secures a larger distance from the opening surface of the case body 302 to the outer surface of the circuit board 314. Contribute. That is, since the ring cover 320 is present, a distance corresponding to the outer peripheral length is added, so that a greater insulation distance can be secured than when the ring cover 320 is not provided. By securing this insulation distance, the safety of the current detector 300 is greatly improved.

As described above, according to the current detector 300 of the third embodiment, the following advantages can be obtained.
(1) By dropping the ring cover 320 by integrally forming the protruding portion 302k on the case main body 302, the circuit board 314 and the magnetic core 310 can be prevented from dropping off. For this reason, it is not necessary to use a large number of separate parts (fasteners such as screws) in order to prevent the dropout, and the ring cover 320 can be in a restricted state, which can also reduce the number of parts and the manufacturing cost. it can.

(2) During assembly work, the position of the lock arm 320b of the ring cover 320 can be easily adjusted to an appropriate positional relationship by adjusting the angle at which the restricting piece 320c does not contact the inner surface of the case main body 302. Thus, errors during assembly work (time loss) can be prevented.

(3) Further, after the circuit board 314 and the magnetic core 310 are inserted into the case main body 302, the ring cover 320 is inserted into the case main body 302, and the ring cover 320 is locked only by rotating in one direction (clockwise direction). Therefore, the assembly work can be completed quickly. Therefore, work efficiency is greatly improved.
(4) In addition, a clear click feeling when the ring cover 320 is locked (a resistance feeling when the restricting piece 320c passes through the protruding portion 302k when inserted, and until the restricting piece 320c contacts the inner surface of the case body 302 when locked. Resistance), the assembly work can be performed lightly.

The present invention can be implemented with various modifications without being limited to the above-described embodiments.
In the first and second embodiments, the arrangement and number of the ribs 102h and 202h and the projecting portions 102k and 202k are arbitrary, and can be added or changed as appropriate.

  In 3rd Embodiment, arrangement | positioning and the number of the control pieces 320c are arbitrary, and can be added and changed suitably. Moreover, although the ring cover 320 is mentioned as an example as another container, the container does not need to be ring-shaped.

  In addition, the current detectors 100, 200, and 300 shown in the drawing and a part of the structure are just preferable examples, and the present invention can be achieved by adding various elements to the basic structure or replacing a part thereof. Needless to say, it can be suitably implemented.

100, 200, 300 Current detectors 102, 202, 302 Case main bodies 102d, 202d, 302d Wall plate portions 104, 204, 304 Insertion holes 110, 210, 310 Magnetic cores 114, 214, 314 Circuit boards 102h, 202h Ribs 102k , 202k, 302k Protruding part 320 Ring cover 320c Restriction piece

Claims (4)

An insertion hole through which the conductor of the current to be detected is inserted is formed on the inside, and a container-shaped accommodation portion in which one surface viewed in the insertion direction of the conductor is opened and the other surface is closed around the insertion hole. A formed case body,
An annular magnetic core that is installed in a state surrounding the insertion hole in the accommodating portion and converges a magnetic field generated by conduction of a detected current;
A circuit board on which a detection circuit for detecting a detected current is formed based on a magnetic flux accommodated in the accommodating portion together with the magnetic core and converged by the magnetic core;
To restrict rotational displacement in the circumferential direction of the insertion hole of any one of the housings that are formed integrally with the case body and that are connected to the circuit board or are housed in the housing portion. Along with this, a current detector provided with a regulating means for regulating dropping of the circuit board through the opening. The current detector of claim 1,
The regulating means is
Including a projecting portion formed to project from the inner surface of the case body into the housing portion, and the projecting portion is in contact with an edge portion of the circuit board or the other housing body in a housing state in the housing portion The current detector is characterized in that the respective regulations are made. The current detector according to claim 1 or 2,
The regulating means is
A rib-shaped portion formed so as to protrude from the inner surface of the case main body along one surface forming the opening, and the rib-shaped portion is in contact with the outer surface of the circuit board in the accommodated state in the accommodating portion. Therefore, the current detector is characterized in that dropping through the opening is regulated. The current detector according to claim 3.
The circuit board is
In the state of being rotationally displaced against the restriction by the restricting means, it has a notch that is not brought into contact with the rib-like part, and relatively accepts the rib-like part in the notch. The current detector is allowed to drop through the opening.