JPH09318673A - Current detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the winding process of lead wires and shrink the mounting capacity by inserting an insulating member covering nearly the whole face of a coil board between the coil board and a circuit board in cooperation with a pedestal. SOLUTION: An insulating member covering nearly the whole face of a coil board 22 is inserted between the coil board 22 and a circuit board 24 in cooperation with a pedestal 21. The coil board 22 formed into a thin plate shape is laminated and fitted in the thickness direction of the pedestal 21 of an assembled current detector 20, the winding process of lead wires is omitted to simplify the assembling process, the thickness is largely reduced, and this apparatus can be made thin. When a circuit board 24 is approached to the thinned coil board 22, nearly the whole face of the coil board 22 is covered with the pedestal 21 and the insulating member 28 laminated on it, the creeping distance between the coil board 22 and the circuit board 24 is made long by multiple barrier walls 26a-26d formed on the insulating member 28, and the withstand voltage characteristic is maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current detector used in a control circuit such as an inverter circuit or an uninterruptible power supply.

[0002]

2. Description of the Related Art Conventionally, as a current detector used in a control circuit such as an inverter circuit or an uninterruptible power supply, for example, one having a structure shown in FIG. 16 or 17 is known.

In the current detector 1 shown in FIG. 16, the surface of an annular core 2 made of a magnetic material having a discontinuous portion 2a is partially covered with a coating material 3 made of an electrically insulating material.
A conducting wire 4 through which a current to be detected flows is wound around the covering material 3, and a magnetic-voltage converting element (Hall element or the like) 5 is interposed in a discontinuous portion of the core 2.

A current detector 6 shown in FIG. 17 has a bobbin 7 formed of an electrically insulating material, around which a conducting wire 8 is wound, and the bobbin 7 around which the conducting wire 8 is wound surrounds the center and the outer periphery of the bobbin 7. A structure in which a core 9 made of a magnetic material is disposed, a discontinuous portion 9a is formed in a part of a magnetic path formed by the core 9, and the magnetic-voltage conversion element 10 is interposed in the discontinuous portion. Has become.

In these current detectors 1 and 6, a current to be detected is passed through the conductor 4 (8) and
The magnetic flux generated at that time is confined in the magnetic path formed by the core 2 (9), and is made to act on the magnetic-voltage conversion element 5 (10) installed in this magnetic path. By converting the magnetic flux into a voltage in the voltage conversion element 5 (10), the current flowing through the conducting wire 4 (8) is detected.

[0006]

In the conventional current detector 1 (6) as described above, the following problems to be improved remain. That is, since the conductor wire 4 (8) is wound in a coil shape in order to generate a magnetic flux for current detection, a winding step of the conductor wire 4 (8) is required, which increases the manufacturing cost. There is also a problem that the current detector 1 (6) becomes thick because the conducting wire 4 (8) must be wound around the core 2 (9). In addition, such an increase in the dimension in the thickness direction is an obstacle to the thinning of the device in which the current detector 1 (6) is used.

The present invention has been made in view of the above-mentioned conventional problems, and it should be solved to provide a current detector capable of reducing the mounting volume while eliminating the step of winding the conductive wire. It is an issue.

[0008]

In order to solve the above-mentioned problems, a current detector according to claim 1 of the present invention has a thin plate-shaped coil substrate laminated on one surface of a pedestal, and a magnetic coil. A current detector comprising a voltage conversion element, a circuit board laminated on the coil board, and a pedestal, a coil board, and a magnetic core mounted so as to sandwich the circuit board. An insulating member is provided between the coil board and the circuit board to cooperate with the pedestal to cover the coil board over substantially the entire surface.

The current detector according to claim 2 of the present invention is
In claim 1, a shield layer made of a conductive material is integrally laminated over substantially the entire surface of the surface of the circuit board facing the insulating member.

A current detector according to claim 3 of the present invention is
The shield layer according to claim 2, wherein the shield layer has at least 1
The feature is that the slit of the strip is formed.

The current detector according to claim 4 of the present invention is
In claim 1, a shield plate made of a conductive material is interposed between the insulating member and the circuit board.

A current detector according to claim 5 of the present invention is
The shield plate according to claim 4, wherein the shield plate has at least 1
The feature is that the slit of the strip is formed.

A current detector according to claim 6 of the present invention is
The magnetic core according to any one of claims 1 to 5,
A shield plate made of a conductive material is laminated on a portion arranged along the circuit board.

The current detector according to claim 7 of the present invention is
7. The magnetic core according to claim 1, wherein the magnetic core is divided into two along a stacking direction of the circuit board, and the magnetic cores are surrounded so as to connect the divided magnetic cores. It is characterized in that a core holder made of a conductive material is provided.

A current detector according to claim 8 of the present invention comprises:
The circuit board according to any one of claims 1 to 7, wherein:
An element shield plate that covers the magnetic-voltage conversion element is provided.

A current detector according to claim 9 of the present invention is
In any one of claims 1 to 8, a through hole for ventilation is formed in a surface of the pedestal facing the coil substrate.

The current detector according to claim 10 of the present invention is the current detector according to any one of claims 1 to 9, wherein the pedestal has good thermal conductivity on the side opposite to the side on which the coil substrate is laminated. It is characterized in that a heat radiator formed of another material is attached.

Further, the current detector according to claim 11 of the present invention is the current detector according to any one of claims 1 to 10, wherein the coil substrate or the circuit is provided on the side of the pedestal on which the coil substrate or the circuit substrate is installed. The present invention is characterized in that a plurality of locking pins that are fitted to the substrate to support them are provided.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In these drawings, reference numeral 20 indicates a current detector according to this embodiment,
The current detector 20 includes a pedestal 21 formed of an electrically insulating material in a substantially rectangular shape and having a predetermined thickness, and a thin plate-shaped coil substrate 22 laminated on one surface (upper surface in the drawing) of the pedestal 21. A circuit board 24 provided with a magnetic-voltage conversion element 23 and laminated on the coil board 22, and a pedestal 2 thereof.
1, a coil board 22, and a magnetic core 25 mounted so as to sandwich the circuit board 24. The pedestal 2 is provided between the coil board 22 and the circuit board 24.
In cooperation with 1, the insulating member 26 covering the coil substrate 22 over substantially the entire surface is interposed.

Next, the details will be described. The pedestal 21 is formed by injection molding or the like, and a pin-shaped input terminal 27 to which a detected current is input is provided on one side of a pair of parallel sides thereof. Are provided at predetermined intervals in the length direction of the side, and at the other side, a plurality of pin-shaped output terminals 28 for outputting the detection voltage are provided at predetermined intervals. .

Further, each input terminal 27 and output terminal 28
Is one end portion (upper end portion in the drawing, the end portion of the side of the pedestal 21 that is projected to the side where the coil substrate 22 and the like are stacked) is perpendicular to the pedestal 21. The other end is bent in the surface direction of the pedestal 21 and is projected to the side of the pedestal 21.

Further, on the other pair of parallel sides of the pedestal 21, the coil board 22, the circuit board 24, and
A pair of side walls 29, 29 forming a recess for accommodating the insulating member 26 and the like are integrally formed.
A guide groove 30 is formed at the intermediate portion in the lengthwise direction of the member 9/29, which penetrates vertically and is open outward in the plane direction.
Is formed, and a part of the magnetic core 25 is inserted.

An insertion hole 31 through which a part of the magnetic core 25 is inserted is formed in the central portion of the pedestal 21, and the pedestal 21 is formed on both sides of the insertion hole 31.
A pair of through holes 32 for communicating the upper and lower surfaces are formed, and a locking groove 33 having a predetermined depth is formed inside the output terminal 28 and between the through holes 32.
Is formed, and an annular flange 34 having a predetermined height is integrally provided at an opening edge portion above the insertion hole 31.

On both sides of the guide groove 30 of the side wall 29, cutouts 35 that open upward and communicate the inside and outside of the pedestal 21 are respectively formed, and the lower end edge portions corresponding to these cutouts 35 are formed. Has a downward opening and a pedestal 2
Notches 36 for communicating the inside and the outside of 1 are formed respectively, and locking pins 37 for fixing the coil board 22 and the circuit board 24 are formed in the upper notches 35.
・ 38 are planted.

The coil substrate 22 is formed on a substantially rectangular insulating substrate so as to surround a through hole 39 provided at the center of the coil substrate 22 by sticking a metal foil on the spiral, or on a metal plate or an insulating substrate. A coil is formed by etching the metal foil attached to. Alternatively, a conductive material,
It is made into a thin plate coil by spirally adhering by means such as vapor deposition, sputtering, plating or screen printing, and it is used alone or a plurality of sheets are laminated via an insulating sheet and are connected in series. The number of turns is adjusted by connecting in parallel or in parallel, or in combination of series and parallel.

Further, a terminal connection hole 40, into which the input terminal 27 provided on the pedestal 21 is fitted and fixed, is formed on one side of the coil substrate 22 so as to correspond to the input terminal 27. The pedestal 21 is provided on both sides of the side opposite to the side where the terminal connection holes 40 are formed.
The connecting pieces 22a to be inserted into the notches 35 are continuously provided, and the locking pins 37 planted in the respective notches 35 are fitted and fixed to the connecting pieces 22a. A pin connection hole 41 is formed.

The circuit board 24 has an upper surface (upper surface in the figure).
The magnetic-voltage conversion element 23 and a current detection circuit to which the magnetic-voltage conversion element 23 is connected as a sensor are formed on a printed wiring board having a wiring pattern formed on one side thereof. , A terminal connection hole 43 into which the output terminal 28 provided on the pedestal 21 is fitted and fixed
Are formed corresponding to the output terminals 28, and are inserted into the notches 35 of the pedestal 21 on both sides of the side opposite to the side where the terminal connection holes 43 are formed. The connecting pieces 24a are continuously provided, and the connecting pieces 24a are formed with pin connection holes 44 into which the locking pins 38 implanted in the respective notches 35 are fitted and fixed. There is.

The insulating member 26 is formed of an electrically insulating material into a substantially rectangular shape and is inserted on the upper surface of the pedestal 21 inside the side walls 29, the input terminal 27 group, and the output terminal 28 group. At the same time, the first barrier wall 26a which is erected upward, that is, in the direction away from the pedestal 21, is provided on the side along the group of the input terminals 27. On a side parallel to the side where the barrier wall 26a is provided, it is raised toward the side opposite to the first barrier wall 26a and is inserted into the locking groove 30 formed in the pedestal 21. A second barrier wall 26b is provided.

Further, the positioning groove 4 formed along the inside of the both side walls 29 of the pedestal 21 is formed on a pair of sides orthogonal to the side where the barrier walls 26a and 26b are provided.
The third barrier walls 26c to be inserted into the parts 5 and 45 are integrally provided so as to project downward, and a through hole 46 penetrating in the thickness direction is formed in the central portion,
The through hole 39 of the coil board 22 is provided so as to project downward so as to surround the lower end opening edge of the through hole.
The annular fourth barrier wall 2 fitted into the insertion hole 31 from the inside of the collar 34 formed on the pedestal 21 through
6d are provided.

On the other hand, above the pair of sides of the insulating member 26 on which the third barrier wall 26c is provided, a substantially central portion in the lengthwise direction of the sides is provided so as to project upward, and will be described later. Core support walls 47 are provided, each of which has a predetermined depth of support groove 47a into which a part of the magnetic core 25 is fitted and supported and which is formed upward. These support grooves 47a are provided in the insulating member 26. Is attached to the pedestal 21 so as to communicate with the guide groove 30 of the pedestal 21.

The magnetic core 25 is formed in a rectangular parallelepiped shape, both ends of which are fitted into the upper ends of the guide grooves 30, respectively, and formed on the core support wall 47 of the insulating member 26. I-shaped core 25a fitted and supported in the supporting groove 47a and the guide grooves 30 of the pedestal 21.
A pair of end protrusions 48, a base 49 for connecting the end protrusions 48 to each other, and a protrusion provided in the center of the base 49 so as to be parallel to the end protrusions 48.
Further, the E-shaped core 25b is composed of a central projection 50 fitted in the insertion hole 31 formed in the pedestal 21.

On the other hand, in this embodiment, a shield plate indicated by reference numeral 51 is arranged along the upper surface of the I-shaped core 25a.
The joint piece 51a formed at one end of the I-core 25 is fitted and fixed to the locking pin 38 that is planted in the notch 35 of the pedestal 21.
It is adapted to be held in surface contact with the upper surface of a and to be grounded via the circuit board 24 fitted and fixed to the locking pin 38.

Next, a procedure for assembling the current detector 20 according to this embodiment having the above-described structure will be described.

First, after the coil board 22 is aligned with the upper part of the pedestal 21, the input terminal 27 of the pedestal 21 is fitted into the terminal connection hole 40 formed in the coil board 22, and the coil board 22 is also fitted. The connecting piece 22a provided on the connecting piece 22 is inserted into the notch 35 formed on the pedestal 21, and the locking pin 37 is fitted into the pin connecting hole 41 formed on the connecting piece 22a. Then, the coil substrate 22 is laminated on the pedestal 21, and the locking pin 37 is fixed to the connecting piece 22a by soldering or bonding.

In this state, the collar 34 provided in the center of the pedestal 21 is fitted into the through hole 39 formed in the center of the coil board 22.

Therefore, in the coil board 22, the input terminal 27 and the terminal connecting hole 40 are fitted, the connecting piece 22a and the notch 35 are fitted, the locking pin 37 and the pin connecting hole 41 are fitted, Further, the through hole 39 and the flange 34 are fitted to each other so that they are attached to the pedestal 21 while being positioned, and the input terminal 27 and the coil board 22 are soldered or connected to the locking pin 37. It is fixed to the pedestal 21 by soldering with the piece 22a.

Next, the coil substrate 22 is covered with the insulating member 26, and the pair of third barrier walls 26c provided on the lower sides of the insulating member 26 are provided with the positioning grooves 45 formed in the pedestal 21. Respectively, and also
By fitting the second barrier wall 26b into the engaging groove 33 of the pedestal 21 and further fitting the fourth barrier wall 26d formed in the lower center part into the insertion hole 31 of the pedestal 21, the coil The substrate 22 is mounted on the pedestal 21 while being positioned, and the coil substrate 2 is mounted between the substrate 22 and the pedestal 21 as shown in FIGS. 3 and 4.
It is designed to cover 2 over almost the entire surface.

Thus, the circuit board 24 is positioned above the insulating member 26 mounted on the pedestal 21, and the output terminals 28 provided on the pedestal are arranged in the terminal connection holes 43 formed in the circuit board 24. And the connection piece 24a of the circuit board 24 is inserted into the notch 35 of the pedestal 21, and the pin connection hole 44 formed in the connection piece 24a is provided with a lock provided on the pedestal 21. Pin 38
The output terminal 28 and the circuit board 2 together.
4, and the locking pin 38 and the circuit board 24 are fixed to each other by soldering or the like.

As a result, the circuit board 24 is fixed in a state of being positioned on the pedestal 21, and in this fixed state, the magnetic-voltage conversion element 23 attached to the circuit board 24 is arranged as shown in FIG. Further, as shown in FIG. 4, the insulating member 26 is positioned above the through hole 46.

Next, after the E-shaped core 25b constituting the magnetic core 25 is positioned below the pedestal 21, the end protrusions 48 provided at both ends thereof are formed on the pedestal 21. The E-shaped core 25 is positioned on the pedestal 21 by inserting the central projection 50 into the insertion hole 31 formed in the central portion of the pedestal 21 while inserting the E-shaped core 25 into the pedestal 21.

As a result, after the I-shaped core 25a constituting the magnetic core 25 is positioned above the circuit board 24, both ends of the I-shaped core 25a are connected to the upper end portion of the guide groove 30 of the pedestal 21. And the insulating member 2
6 are fitted and supported in the support grooves 47a formed in both core support walls 47.

The I-shaped core 25a thus mounted
As shown in FIGS. 2 and 4, the ends of the
The end surface of each end protrusion 48 of the mold core 25b is opposed to or brought into contact with the end surface of the die core 25b.
It is held in a state of being opposed to the magnetic-voltage conversion element 23 mounted on the vehicle at a predetermined interval. The distance between the I-shaped core 25a and the magnetic-voltage converting element 23 is determined by the size of the core supporting wall 47 of the insulating member 26.

The I-shaped core 25a and the E-shaped core 25b thus mounted are connected and fixed to each other at both ends by an adhesive or the like, as shown in FIG.
The pedestal 21, the coil board 22, the insulating member 26, and the circuit board 24 are attached so as to sandwich them.

Further, the shield plate 51 is superposed on the upper surface of the I-shaped core 25a, and the joining piece 51a connected to one end of the shield plate 51 is attached to the base 21 as shown in FIGS. After being fitted to the stop pin 38, the shield plate 51 is fixed to the upper surface of the I-shaped core 25a in a surface contact state by connecting the shield plate 51 to each other by using solder or an adhesive, and the shield plate 51 is It is grounded via the circuit board 24 connected to the locking pin 38.

With this procedure, the current detector 20 according to the present embodiment is assembled as shown in FIGS. 2 to 4. In the current detector 20, the coil substrate 22 is formed in a thin plate shape. Since it is mounted on the pedestal 21 in a laminated manner in the thickness direction, the winding process of the conductive wire is omitted as compared with the conventional current detector that forms the coil by winding the conductive wire around the magnetic core. As a result, the assembling process is simplified and the thickness thereof is significantly reduced, so that the device can be made thinner.

Moreover, even when the coil board 22 and the circuit board 24 are brought close to each other by such a reduction in thickness, the coil board 22 is substantially composed of the pedestal 21 and the insulating member 26 laminated thereon. While being covered over the entire surface, the creeping distance between the coil board 22 and the circuit board 24 is set to be long by the plurality of barrier walls 26a, 26b, 26c, 26d formed on the insulating member 26, As a result, withstand voltage characteristics are maintained as in the prior art.

Further, in this embodiment, the I-type core 2 is used.
By laminating the shield plate 51 on 5a and grounding the shield plate 51 via the joint piece 51a, the locking pin 38, and the circuit board 24, the I
Even when noise propagates to the die core 25a, the noise is prevented from being guided from the shield plate 51 to the ground portion and acting on the magnetic-voltage conversion element 22 or the current detection circuit 42. Therefore, stable detection accuracy that is strong against noise is ensured.

Further, at the time of current detection, the current to be detected flows to the coil of the coil substrate 22 via the input terminal 27,
Although a phenomenon occurs in which the coil board 22 generates heat, in the present embodiment, the pedestal 2 that surrounds the coil board 22.
Since the through hole 32 is formed in a portion of the first member facing the coil substrate 22, and the notch 36 that connects the lower surface of the pedestal 21 and the outside is formed in the side wall of the pedestal 21, The heat of the coil plate 22 is radiated to the outside of the pedestal 21 through the through hole 32 and the notch 36, and as a result, the decrease in the accuracy of current detection due to the temperature rise of the coil substrate 22 is suppressed.

Further, in this embodiment, the pedestal 2 is used.
The coil board 22 mounted on the first terminal has a plurality of input terminals 27.
And a pair of locking pins 37 support the four corners of the circuit board 24. The plurality of output terminals 28 provided on the pedestal 21 and the locking pins 38 support the circuit board 24 at the four corners of the pedestal 21. The coil substrate 22 and the circuit substrate 24 are firmly supported by the support of the current detector, and as a result, a current detector excellent in vibration resistance can be obtained.

Next, a second embodiment of the present invention will be described with reference to FIGS. The current detector according to the present embodiment, which is denoted by reference numeral 60 in FIG. 5, is a modification of the circuit board 24 in the first current detector 20 described above, and the other components are configured in exactly the same manner. Therefore, the same parts as those in the first embodiment will be denoted by the same reference numerals and the description will be simplified.

The circuit board 61 modified in accordance with the present embodiment is provided with a conductive material on the back surface thereof, that is, the surface facing the insulating member 26, by means such as vapor deposition, sputtering or sticking of a metal foil. A shield layer 62 is formed over substantially the entire surface, and is electrically connected to one of the output terminals 28 fitted and connected to the terminal connection hole 43 of the circuit board 61, and the output terminal 28 is connected to the output terminal 28. It is designed to be grounded through.

In the current detector 60 according to the present embodiment having such a configuration, the noise propagating to the circuit board 61 is captured on the entire back surface of the circuit board 61, and the current is passed through the output terminal 28. By introducing the noise to the outside of the detector 60, the noise propagating to the circuit board 61 is efficiently removed, and the influence on the output characteristics of the current detector 60 is significantly improved.

When the degree of influence of noise on the output characteristics in this embodiment is examined, the results shown in FIG. 6 are obtained.

The output characteristic shown in FIG. 6A relates to the current detector in the present embodiment which is not provided with the noise removal measure, and FIG. 6B shows the output characteristic of the current detector 60 according to the present embodiment. Is.

As is clear from this result, in the current detector 60 according to this embodiment, the coil substrate 22 is used.
Most of the influence of the noise generated at the current detection circuit including the magnetic-voltage conversion element 23 is removed.

Since such a noise removing measure is performed by forming a conductive film on the back surface of the circuit board 61, the size of the current detector 60 is extremely small and the current detector 60 is thin. It does not become an obstacle to the conversion.

Next, a third embodiment of the present invention will be described with reference to FIG. The current detector 70 according to the present embodiment is made of a conductive material between the insulating member 26 of the current detector 20 of the first embodiment and the circuit board 24 laminated on the insulating member 26. The shield plate 71 is interposed.

The shield plate 71 is the same as the circuit board 24.
Is formed in substantially the same shape as that of the circuit board 24, and is in contact with the back surface of the circuit board 24 over the entire surface thereof. , Is fixed to the pedestal 21 by being connected to the output terminal 28 by soldering or the like, and is grounded via the output terminal 28.

With this structure, the same noise reduction effect as that of the current detector 60 in the second embodiment described above can be obtained, and the shield can be obtained by a simple work such as punching out a sheet-shaped conductive material. Since the plate 71 is obtained, manufacturing the current detector 70 does not lead to high cost.

On the other hand, the second embodiment and the third embodiment
The shield layer 62 and the shield plate 71 shown in the above embodiment may be provided with at least one slit S as shown in FIGS. 8 and 9.

This is because when the detected current input to the coil substrate 22 is an alternating current, an eddy current is induced in the shield layer 62 and the shield plate 71 by the magnetic flux generated in the coil substrate 22, and this eddy current is generated. The current causes the response of the circuit board 24 to be delayed and the shield layers 62 and the shield plate 71 to generate heat. However, the slit S prevents the generation of the eddy current, which causes the problems. It was done.

The effect of preventing the deterioration of responsiveness due to the provision of the slit S was compared with the case without the slit S, and the results shown in FIG. 10 were obtained. FIG. 10A shows the response characteristic when the slit S is not provided, and FIG. 10B shows the response characteristic when the slit S is provided. As is clear from these results,
By providing the slit S, the responsiveness can be improved.

FIG. 11 shows the fourth embodiment of the present invention, in which the shield plate 51 shown in the first embodiment is modified to constitute a current detector 80. That is, in the present embodiment, the shield plate 51 shown in the first embodiment is used as the magnetic core 2
5 is a core holder 81 formed so as to surround 5. The core holder 81 includes a pressing plate portion 81a arranged along the upper surface of the I-shaped core 25a, and the pressing plate portion 81a from both ends of the pressing plate portion 81a. Side arm portions 81b provided substantially orthogonal to the pressing plate portion 81a and arranged along both ends of the magnetic core 25, and the tip portions of these side arm portions 81b are parallel to the pressing plate portion 81a. And an I-shaped core 25a and an E-shaped core 25a which are in a butted state with each other. Core 2
5b is set to be slightly narrower than the space between the I-shaped core 25a and the base plate 49, and both ends of the pressing plate 81a are in contact with the I-shaped core 25a. It is formed into a curved shape as a whole so as to be slightly separated from the core 25a.

Further, in the present embodiment, the central portion of each of the engaging plate portions 81c is punched out to a predetermined width to form a connecting terminal 82 which linearly projects from the tip portion of the side arm portion 81b.

The current detector 80 according to this embodiment having the above-described structure is used for the magnetic core 2 in the butted state.
5, the pressing plate portion 81a of the core holder 81 is brought into contact with the upper surface of the I-shaped core 25a, and both end portions of the pressing plate portion 81a are elastically deformed toward the I-shaped core 25a while the both engaging plate portions 81c. Are opposed to the lower surface of the E-shaped core 25b, and then the pressing force on the pressing plate portion 81a is released to bring the engagement plate portion 81c into pressure contact with the lower surface of the base 49 of the E-shaped core 25b. The core 25a and the E-shaped core 25b are connected and fixed to each other in a state where they are brought into contact with each other at the both end protrusions 48 of the E-shaped core 25b, and the current detector 80 is held in the assembled state as shown in FIG.

In the magnetic core 25 held by the core holder 81 in this manner, both ends of the pressing plate portion 81a of the core holder 81 are curved so as to be separated from the I-shaped core 25a. Pressing plate part 81
The elastic force of a holds both the I-shaped cores 25a and the E-shaped cores 25b in a pressed state, so that the adhesive or the like used for connecting the both I-shaped cores 25a and the E-shaped cores 25b is omitted as necessary. It

As shown in FIG. 12, the current detector 80 according to the present embodiment having the above-described structure has the connection terminals 82 extending from the both side arm portions 81b of the core holder 81 and the current detector 80. 80 is inserted into a connection hole 85 with a ground wire 84 formed on a substrate 83 on which it is mounted, and is grounded by being fixed by solder or the like.

Therefore, the core holder 81 is attached to the base 2
Since the pedestal 21 is connected directly to the substrate 83 and grounded without the intermediary of 1, the structure of the pedestal 21 is simplified, and the number of connection points is reduced, so that noise can be smoothly removed from the core holder 81. Be done.

Further, the I-shaped core 25a and the E-shaped core 25b forming the magnetic core 25 are surrounded by the core holder 81, and are held in pressure contact with each other by the core holder 81, so that their relative positions are maintained. The relationship is prevented from shifting and the vibration resistance is improved.

The connection terminals 82 formed on the core holder 81 may be projected along the length direction of the both side arm portions 81b as shown in FIGS. As shown in FIG. 13, it may be bent in a direction orthogonal to the both side arm portions 81b.

With such a structure, it is possible to correspond to surface mounting in which the input terminal 27 and the output terminal 28 are fixedly mounted on the surface of the substrate 83.

FIG. 14 shows a fifth embodiment of the present invention. The current detector 90 according to the present embodiment covers the magnetic-voltage conversion element 23 mounted on the circuit board 24 and shields the element. A plate 91 is attached, and this element shield plate 9
1 is grounded via a ground wire 92 formed on the circuit board 24.

A large number of holes 93 are formed in the element shield plate 91 to prevent an eddy current from being generated in the element shield 91 by the magnetic flux generated in the coil substrate 22. It is designed to prevent a decrease in responsiveness around the shield 91.

By adopting the configuration of this embodiment as described above, the noise directly acting on the magnetic-voltage conversion element 23 is removed, so that the influence of the noise on the output characteristics is further reduced and the detection accuracy is improved. Planned.

Further, FIG. 15 shows a sixth embodiment of the present invention. In this figure, a current detector according to the present embodiment, which is denoted by reference numeral 100, is provided below the pedestal 21.
A heat radiator 101 made of a material having good heat conduction, for example, aluminum is installed.

The radiator 101 has a through hole 102 formed at the center thereof for communicating with the insertion hole 31 of the pedestal 21, and a plurality of notches 36 formed in the pedestal 21. A plurality of heat-conducting legs 103, which are fitted together and exposed to the outside at the side portions of the pedestal 21, and inside the pair of through-holes 32 formed in the pedestal 21 on both sides of the through-hole 102. Is provided with a heat conducting plate 104 that is brought into contact with the coil substrate 22 laminated on the pedestal 21. These heat conducting plates 104 are formed into a plate shape by a material having excellent thermal conductivity and electrical insulation. Has been formed.

In the current detector 100 of the present embodiment having such a configuration, the radiator 101 is attached to the lower surface of the pedestal 21, and then the E-shaped core 25b is attached from below the radiator 101. Similarly, it is assembled by surrounding each component between the E-shaped core 25b and the I-shaped core 25a.

In the current detector 100 according to this embodiment assembled in this manner, the heat of the coil substrate 22 which is most likely to generate heat is transferred to the radiator 101 via the heat conducting plate 104, and then the heat is generated. The heat is radiated to the outside air through the lower surface of the radiator 101 and the heat-conducting legs 103 located in the notches 36 of the pedestal 21. Therefore, by suppressing the temperature rise of the coil substrate 22,
A stable and highly accurate detection operation is performed.

The shapes, dimensions, etc. of the constituent members shown in the above embodiments are merely examples, and can be variously changed based on design requirements.

For example, the presence or absence of the shield layer 62, the shield plate 71, or the slits S formed therein, and the combination of the shield plate 51, the core holder 81, and the like that are provided along with the magnetic core 25 are set under the installation conditions. It is set arbitrarily based on the required accuracy and the like.

Further, as shown in FIG. 1, the I-shaped core 25a
On both sides of the guide groove 30 of the pedestal 21 on which the protrusions 48 on both ends of the core and the E-shaped core 25b are located.
By forming a recess D in which the contact portions of 5a and 25b are exposed and filling the contact portion with the adhesive through the recess D, and filling the adhesive in the recess D,
It is also possible to facilitate the bonding work between the two and to bond the both from a side surface other than the abutting surface to increase the bonding strength and improve the vibration resistance strength.

[0082]

As described above, according to the first aspect of the present invention.
According to the current detector of the present invention, since the coil is formed by laminating the coil substrate on the pedestal, the current detector has a structure in which the conductor wire is wound around the magnetic core to form the coil. As a result, the winding process of the conductive wire can be omitted to simplify the assembling process, and the thickness thereof can be reduced to significantly reduce the mounting height on the device.

Further, by disposing an insulating member, which cooperates with the pedestal and covers the coil substrate, between the coil substrate and the circuit substrate laminated on the pedestal, the insulating member allows the coil substrate to be covered. It is possible to secure a sufficient creepage distance between the circuit board and the circuit board, and as a result, even if the current detector is made thinner by bringing the circuit board and the coil board close to each other, the withstand voltage characteristic is maintained as in the conventional technology. can do.

According to the current detector of claim 2 of the present invention, a shield layer made of a conductive material is integrally laminated on the circuit board of claim 1, so that the shield layer propagates to the circuit board. Noise is captured and removed from the entire back surface of the circuit board, and as a result, the noise propagating to the circuit board can be efficiently removed, and the influence of the noise on the output characteristics of the current detector can be significantly improved. it can.

According to the current detector of claim 3 of the present invention, since at least one slit is formed in the shield layer of claim 2, generation of an eddy current in the shield layer is suppressed and the current is reduced. This suppresses the decrease in responsiveness at the time of detection and suppresses the temperature rise of the circuit board, which enables stable and highly accurate current detection.

According to the current detector of claim 4 of the present invention, the shield plate made of a conductive material is interposed between the insulating member of claim 1 and the circuit board. Similarly, the noise propagating to the circuit board is captured and removed on the entire back surface of the circuit board, and as a result, the noise propagating to the circuit board is efficiently removed, and the noise to the output characteristics of the current detector is reduced. The effect of can be greatly improved.

According to the current detector of claim 5 of the present invention, by forming at least one slit in the shield plate of claim 4, generation of an eddy current in the shield plate is suppressed, and the current is reduced. This suppresses a decrease in responsiveness at the time of detection and suppresses an increase in temperature of the shield plate itself and the circuit board facing the shield plate to enable stable and highly accurate current detection.

According to the sixth aspect of the present invention, the coil is formed by laminating a shield plate made of a conductive material on a portion of the magnetic core arranged along the circuit board. The noise propagating from the substrate to the circuit board via the magnetic core can be removed to prevent the noise from propagating from the magnetic core facing the circuit board to improve the accuracy of current detection.

According to the current detector of claim 7 of the present invention, by providing the core holder made of a conductive material to surround the magnetic core divided into two along the stacking direction of the circuit boards, the magnetic body is provided. The noise propagating to the core is trapped and removed almost all around the magnetic core, whereby the efficiency of removing the noise propagating to the circuit board is increased, the current detection accuracy is improved, and the magnetic core divided into two is separated. Since the holding is ensured and the core holder can be directly opposed to the board on which the current detector is mounted, it is possible to directly connect the core holder to the board and install the core holder and the pedestal. It is possible to simplify the overall configuration by omitting the joining with.

According to the current detector of the eighth aspect of the present invention, since the element shield plate is provided so as to cover the magnetic-voltage conversion element mounted on the circuit board, the magnetic-voltage conversion element can be directly attached to the magnetic-voltage conversion element. Capture and remove the noise that acts,
As a result, the current detection accuracy can be improved.

According to the current detector of claim 9 of the present invention, since the through hole for ventilation is formed in the surface of the pedestal, which is opposed to the coil substrate, the pedestal is retained between the coil substrate and the pedestal. The heat is discharged to the outside to suppress the temperature rise of the coil substrate, and thus the accuracy of current detection can be stabilized.

Further, according to the current detector of the tenth aspect of the present invention, a radiator formed of a material having good thermal conductivity is attached to the side of the pedestal opposite to the side on which the coil substrates are laminated. By this, the heat radiator can forcibly absorb the heat in the coil substrate itself or the space between the coil substrate and the pedestal and discharge it to the outside, and as a result, the current detection accuracy is further stabilized. be able to.

Further, according to the current detector of the eleventh aspect, a plurality of locks are fitted to the coil board and the circuit board on the side of the pedestal where the coil board and the circuit board are installed to support them. By providing the pins, the coil board or the circuit board and the pedestal are supported in cooperation with the input terminals or output terminals that are usually provided, thereby supporting the coil board or the circuit board at a plurality of points. As a support, stable support can be secured and vibration resistance strength can be increased.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of the present invention.

FIG. 2 is an external perspective view showing the first embodiment of the present invention.

FIG. 3 shows the first embodiment of the present invention and is a cross-sectional view taken along the line III-III of FIG.

4 shows the first embodiment of the present invention, and is a cross-sectional view taken along the line IV-IV in FIG.

FIG. 5 is an exploded perspective view showing a second embodiment of the present invention.

FIG. 6 shows a comparison between a voltage output characteristic in the second embodiment of the present invention and a conventional voltage output characteristic, where (A) is a conventional example and (B) is this embodiment.

FIG. 7 is an exploded perspective view showing a third embodiment of the present invention.

FIG. 8 shows a modified example of the second embodiment of the present invention, and is an external perspective view of a circuit board.

FIG. 9 shows a modified example of the third embodiment of the present invention, and is an external perspective view of a shield plate.

FIG. 10 is a voltage-time diagram showing a change in responsiveness when a slit is provided in the shield layer in the second embodiment of the present invention and the shield plate in the third embodiment,
(A) is a voltage-time diagram with a slit and (B) with a slit.

FIG. 11 is an exploded perspective view showing a fourth embodiment of the present invention.

FIG. 12 shows a fourth embodiment of the present invention and is an external perspective view showing a mounting method on a substrate.

FIG. 13 shows a modified example of the fourth embodiment of the present invention, and is an external perspective view showing a mounting method on a substrate.

FIG. 14 is an exploded perspective view showing a fifth embodiment of the present invention.

FIG. 15 is an exploded perspective view showing a sixth embodiment of the present invention.

FIG. 16 is a plan view showing an example of a conventional current detector.

FIG. 17 is a vertical sectional view showing another example of a conventional current detector.

[Explanation of symbols]

 20, 60, 70, 80, 90, 100 Current detector 21 Pedestal 22 Coil board 22a Coupling piece 23 Magnetic-voltage conversion element 24, 61 Circuit board 24a Coupling piece 25 Magnetic core 25a I type core 25b E type core 26 Insulation Member 32 Through hole 37/38 Locking pin 51 Shield plate 62 Shield layer 71 Shield plate 81 Core holder 91 Element shield plate 101 Radiator S Slit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuaki Ito 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Kagaku (72) Inventor Seiko Torii 5-36-11 Shinbashi, Minato-ku, Tokyo Fuji Electrochemical Co., Ltd.

Claims (11)

[Claims] 1. A thin plate-shaped coil substrate (22) laminated on one surface of a pedestal (21), and a magnetic-voltage conversion element (2).
3), the circuit board (24) laminated on the coil board (22), and the pedestal (21), the coil board (22), and the circuit board (24) sandwiched between them. A magnetic core (25), wherein a current detector (20) is provided between the coil board (22) and the circuit board (24) in cooperation with the pedestal (21), An electric current detector characterized in that an insulating member (26) for covering the coil substrate (22) over substantially the entire surface thereof is interposed. 2. A shield layer (62) made of a conductive material is integrally laminated on substantially the entire surface of the circuit board (24) facing the insulating member (26). The current detector according to claim 1, wherein: 3. The current detector according to claim 2, wherein the shield layer (62) is provided with at least one slit (S). 4. A shield plate (7) made of a conductive material is provided between the insulating member (26) and the circuit board (24).
The current detector according to claim 1, wherein 1) is interposed. 5. The current detector according to claim 4, wherein the shield plate (71) has at least one slit (S) formed therein. 6. A shield plate (51) made of a conductive material is laminated on a portion of the magnetic core (25) arranged along the circuit board (24). The current detector according to any one of claims 1 to 5. 7. The magnetic core (25) is divided into two along the stacking direction of the circuit board (24), and these divided magnetic cores (25a, 25b) are connected to each other. The current detector according to any one of claims 1 to 5, further comprising a core holder (81) made of a conductive material, the core holder (81) surrounding the magnetic cores (25a, 25b). 8. The circuit board (24) is provided with an element shield plate (91) for covering the magnetic-voltage conversion element (23). The current detector according to claim 1. 9. The through hole (32) for ventilation is formed in a surface of the pedestal (21) facing the coil substrate (22), as claimed in any one of claims 1 to 8.
The current detector according to any one of 1. 10. A radiator (101) made of a material having good thermal conductivity is attached to the side of the pedestal (21) opposite to the side where the coil substrate (22) is laminated. The current detector according to any one of claims 1 to 9, wherein: 11. The side of the pedestal (21) on which the coil board (22) and the circuit board (24) are installed,
11. A plurality of locking pins (37, 38) fitted to and supporting the coil board (22) and the circuit board (24) are provided.
The current detector according to any one of 1.