JP3052774B2 - Current detector - Google Patents

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 for a control device provided in an inverter circuit, an uninterruptible power supply, or the like.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional example of this type of current detector. This current detector 1 has a conductor winding 3 wound around a bobbin 2 and a conductor winding 3 of this type. A magnetic core 4 is mounted so as to surround the inner and outer circumferences, and a support plate 5 is connected to both ends of the bobbin 2 in a direction orthogonal to the bobbin 2. A substrate 8 on which a Hall element 6 for inducing a voltage corresponding to a magnetic flux generated when a current flows through the conductor winding 3 and an amplifier 7 for amplifying the voltage induced in the Hall element 6 is mounted. It is constituted by.

The current flowing through the conductor winding 3 is detected based on the voltage value output from the amplifier 7.

[0004]

However, in such a conventional current detector 1, the use of the bobbin 2 causes an increase in the number of components and an increase in manufacturing costs due to the necessity of a winding step. Further, the dimension in the thickness direction due to the winding of the conductor winding 3 around the bobbin 2 is enlarged, and further, there is a problem that application to surface mounting is hindered due to the dimension enlargement in the thickness direction. ing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and provides a current detector which does not require a bobbin or a winding step, can be made thinner, and is suitable for surface mounting. With the goal.

[0006]

According to a first aspect of the present invention, there is provided a current detector comprising: a printed coil having a film formed on a surface of a sheet; And a detection substrate (12) for detecting magnetic flux are laminated together, and the magnetic core (14) is
3) The print is attached so as to sandwich
Laminate (13) of coil (11) and detection substrate (12)
Has an inner peripheral portion of the magnetic core (14) fitted therein.
This allows the positioning of these magnetic cores and the laminate
Notches (21, 22 and 23) are formed
Characterized in that that.

[0007] The current detector according to claim 2 of the present invention comprises:
Printed coil with coil formed on the surface of the sheet
(11) and the detection board (12) for detecting magnetic flux
The printed coil (11) and the detection board
On one side of the laminate (13) with (12), a flat
Strong plate (31) is attached and these
The magnetic core is sandwiched between the laminate and the reinforcing plate.
(14), and the reinforcing plate (31)
When the inner peripheral portion of the body core (14) is fitted,
A notch for positioning the magnetic core and the reinforcing plate.
(33) is formed.

[0008]

[0009]

[0010]

According to the current detector according to the first aspect of the present invention, since the coil is formed in the form of a film on the surface of the sheet by using the printed coil, the bobbin is not required, and this is not necessary. The operation of winding the conductor winding on the bobbin is not required, and the coil portion can be made thinner because the bobbin is not required and the printed coil has a sheet shape.

[0011] Then, the printed coil and the detection board are laminated, and a magnetic core is attached with the laminated body interposed therebetween to constitute a current detector.
The thickness of the current detector itself is reduced. Therefore, a current detector suitable for surface mounting is obtained.

Further, by fitting the inner peripheral portion of the magnetic core into the notch formed in the laminated body of the print coil and the detection board, the relative positional relationship between the two is restrained. Thus, the positional relationship between the coil portion of the print coil and the magnetic core is maintained, and the magnetic path of the print coil is reliably formed.

Further, according to the current detector according to claim 2 of the present invention, on one side of the laminate of the printed coil and the detection substrate, by a plate-shaped reinforcing plate is attached, the thickness of the Strength is ensured while minimizing the increase.

Furthermore, the laminate reinforcement plate is attached, the magnetic core is positioned through the notch are formed in these. Thereby, the positional relationship between the print coil and the magnetic core is restrained by the reinforcing plate, and the deviation of the positional relationship is further suppressed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 10 denotes a current detector according to the present embodiment. The current detector 10 includes a printed coil 11 and a detection substrate 12 that detects a magnetic flux. 13 has a schematic configuration in which a magnetic core 14 is attached so as to sandwich the laminated body 13.

To explain these details, as shown in FIG. 2, the printed coil 11 includes an insulating sheet 15 having a rectangular planar shape and a surface on one end side of the insulating sheet 15. The coil 16 is formed in a film shape and a spiral shape.

Here, as a method of forming the coil 16 in a film shape, various film forming techniques such as a thin film, a thick film, printing, etching, and press are exemplified.

The coil 1 of the insulating sheet 15
6, a rectangular through hole 17 is formed at a position corresponding to the center portion. When the through hole 17 is stacked on the detection substrate 12, a hole element 18 described later attached to the detection substrate 12 faces the same. The coil 16 is formed so as to surround the through hole 17.

Further, in this embodiment, a plurality of the printed coils 11 are laminated via an insulator 19 made of an insulating sheet, and the coils 16 of the respective layers are formed on the insulating sheet 15 of the printed coil 11. Hole 15a
Also, one winding is formed by being connected in series through a hole 19 a formed in the insulator 19, and each of the insulators 19 is formed in the printed coil 11. A through hole 20 similar to the formed through hole 17 is formed.

On the other hand, in this embodiment, both sides of the insulating sheet 15 and the insulator 19 of each of the printed coils 11 are arranged so as to be linear with respect to the through holes 17 and 20. Notches 21 and 22 opened outward are formed so that a part of the inner peripheral portion of the magnetic core 4 can be fitted.

The detection board 12 is formed of an insulating sheet having a slight thickness by using an insulating sheet 15 of the printed coil 11.
Are formed so as to have substantially the same planar shape as above, and in a state where the insulating sheet 15 and the insulator 19 are stacked,
A Hall element 18 for detecting a magnetic flux generated by the coil 16 is attached,
Notches 23 are formed on both sides of the Hall element 18 so as to match the notches 21 and 22 of the insulating sheet 15 and the insulator 19.

A drive voltage is applied to the Hall element 18 on one side of the detection substrate 12 other than the side where the notch 23 is formed.
A plurality of detection terminals 2 for outputting detection voltages output from
The input side terminal 25 connected to the coil 16 is provided on the other side, and a control circuit 26 having an amplifier and the like is mounted at a position avoiding the coil 16.

The control circuit 26 may be provided integrally with the Hall element 18 in some cases.

Further, as shown in FIG. 3, the magnetic core 14 has a first core member 14a disposed on one surface side (lower side in FIG. 3) of the laminated body 13 and the other surface. And a second core member 14b arranged on the side (upper side in FIG. 3), and a central portion of the first core member 14a in the longitudinal direction is formed with a through hole 17 of the print coil 11. And a central protruding portion A which is fitted into the through hole 20 of the insulator 19 and is opposed to the Hall element 18 attached to the detection board 12, and is provided at both ends. The side end protrusion B which is set higher than the center protrusion A and is fitted into the cutout 21 of the printed coil 11, the cutout 22 of the insulator 19, and the cutout 23 of the detection board 12. Are protruding respectively There.

When the first core member 14a is mounted on one side of the laminated body 13, these side edge protrusions B are slightly larger than the Hall elements 18 mounted on the detection substrate 12. The height is such that it protrudes.

When the second core member 14b is attached to the other surface of the laminated body 13, both end portions of the second core member 14b project from the respective side end protrusions B of the first core member 14a. By being brought into contact with the end face, the detection substrate 12
Are arranged so as to face the Hall element 18.

As shown in FIG. 2, the current detector 10 of the present embodiment having the above-described configuration includes three insulators 19 and two printed coils 11, and the insulator 19 is an outermost layer. After the coils 16 of each layer are connected in series through the holes 15a formed in the insulating sheet 15 of the printed coil 11 and the holes 19a formed in the insulator 19, one side of the coil 16 is formed. , The detection board 12 is laminated, and the end of the coil 16 connected in series is connected to the input terminal 25 attached to the detection board 12 to form a laminate 13. The first core member 14a is opposed to one surface side of the body 13, and
After the second core member 14bc is opposed to the other surface side, the first core member 14a is inserted into the through holes 17 and 2 of the insulating sheet 15 and the insulator 19 with the central raised portion A.
0 to face the Hall element 18 attached to the detection board 12, and to form the insulating sheet 15, the insulator 19, and the notch 21. 22 and 23, and further, the second core member 14b is attached to the first core member 14a via the protrusions B on both side ends, thereby assembling as shown in FIG.

The fixing of the first core member 14a and the second core member 14b is performed, for example, by sticking with an adhesive.

The current detector 10 of this embodiment assembled as described above has a coil portion formed by the printed coil 11 and a magnetic core 14 attached so as to sandwich the laminate 13. , Coil 1
6, a magnetic path is formed.

Since the coil 16 is formed in a film shape on the insulating sheet 15, a bobbin serving as a support for the coil 16 becomes unnecessary, and the coil 16 itself is formed thin. And a pattern wound in a single plane for each print coil 11,
Further, since the insulating sheet 15 serving as a support for the coil 16 is formed thin, the thickness of the laminate 13 can be suppressed to be thin. Further, since the magnetic core 14 forming a magnetic path is provided so as to surround the laminate 13, the thickness of the current detector 10 as a whole is made equal to or less than the thickness of the magnetic core 14. Vessel 1
0 is obtained.

On the other hand, in this embodiment, the detection substrate 12
Is formed to be slightly thicker than the other constituent members of the laminate 13, so that the overall strength is maintained by the adhesive strength of each constituent member based on the strength of the detection substrate 12. I have.

The current detector 10 of the present embodiment is
It is attached to various devices using the terminals 24 and 25 protruding from both ends thereof.
Since the thickness of 0 is formed to be thin as described above, surface mounting becomes possible at the time of attachment to equipment,
This is advantageous for making the equipment thinner.

Next, another embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

In FIG. 4, reference numeral 30 denotes a current detector according to the present embodiment. This current detector 30 has a plate-like reinforcing plate 31 disposed on one side surface of the laminate 13 shown in the above embodiment. There is a difference in connecting the laminated body 13 and the magnetic core 14 via the reinforcing plate 31. The other configuration is the same as that of the above-described embodiment.

More specifically, as shown in FIG. 6, the reinforcing plate 31 is made of the insulating sheet 15 or the insulating material 1 of the laminate 13.
9, a through-hole 32 into which the central protruding portion A of the first core member 14a of the magnetic core 14 is fitted, and both side protruding portions of the first core member 14a. B has a configuration in which a notch 33 that is opened outward and into which a part of the inner peripheral portion is fitted is formed.

The first core member 14a is positioned and held by fitting with the through hole 32 and the notch 33 formed in the reinforcing plate 31, and accordingly, the first core member 14a is held. In addition, the notch of each component of the laminated body 13 provided in the embodiment is not required (see FIG. 5).

Further, in this embodiment, on the surface of the laminate 13 opposite to the side on which the detection substrate 12 is laminated,
A component mounting board 34 made of an insulating sheet is laminated as shown in FIG. 5, and various elements constituting an electric circuit are separately mounted on the component mounting board 34 and the detection board 12.

With such a configuration, the strength of the current detector 30 is ensured by the reinforcing plate 31, and accordingly, the detection substrate 1 in the above embodiment is correspondingly increased.
2 is reduced, and the insulating substrate 15 on which the coil 16 is formed, or the detection substrate 12 on which the Hall element 22 and the control circuit 26 are attached, and the heavy magnetic core 14 are attached to the reinforcing plate 31. Are connected indirectly through the coil, the coil 16 formed on the printed coil 11 and its connection portion, or the detection substrate 1
2 or the control circuit 2
Unnecessary external force directly acting on the element 6 is reduced, and the occurrence of problems such as separation and disconnection of signal lines and the like is reduced, and the strength of the current detector 30 is improved.

Since the various electronic elements are separately mounted on the detection board 12 and the component mounting board 34, the degree of freedom in the layout of the electronic elements provided on each of the boards 12 and 34 is increased. By simplifying the wiring for connecting the electronic elements and connecting the terminals, the current detector can be reduced in size.

It should be noted that the shapes, dimensions, and the like of each component shown in the above-described embodiment are merely examples, and can be variously changed based on design requirements and the like. For example, in each of the above embodiments, notches (21...) Are formed in the laminate 13 and the reinforcing plate 31 in order to determine the relative positional relationship between the laminate 13 and the magnetic core 14 or to maintain the positional relationship. 22 ・ 23 ・
Although the example in which 33) is formed has been described, when positioning or the like is possible by interlocking with another part, this can be omitted.

Although the example using two printed coils 11 has been described, the number of stacked coils can be appropriately changed according to the magnitude and type of the current to be detected.

Further, in the embodiment shown in FIG. 2, a component mounting board made of an insulating sheet is provided on the surface opposite to the side on which the detection substrate 12 is laminated, similarly to the embodiment shown in FIG. You may.

[0043]

As described above, according to the first aspect of the present invention,
According to the current detector according to the present invention, by using a printed coil, a coil portion can be formed by forming a film-shaped coil on a sheet, so that the bobbin itself is unnecessary and the conductor to the bobbin is not required. This eliminates the need for the winding operation of the winding, thereby reducing the number of parts and reducing the manufacturing cost by omitting the winding step of the conductor winding.

In addition, since the bobbin is not required and the print coil is formed in a sheet shape, the coil portion can be made thinner. By mounting the magnetic core with the laminate interposed therebetween, a thin current detector can be obtained as a whole.

Therefore, when this current detector is mounted on a device, surface mounting can be performed along the surface direction of the mounting position, which is suitable for thinning the device.

Further, a notch is formed in the printed coil and the detection substrate constituting the laminated body, and the magnetic core is fitted in the notch, so that the relative positions of the coil and the magnetic core are determined. The alignment can be performed with high accuracy, the positional relationship is maintained, and the leakage of magnetic flux is suppressed to enable high-precision current detection.

Further, according to the current detector according to claim 2 of the present invention, by providing a plate-shaped reinforcing plate to the side surface of the stack, the current detector with excellent durability by increasing the strength of the laminate Can be obtained.

Further , a notch is formed in the reinforcing plate provided on the side surface of the laminate, and the magnetic core is fitted into the notch, so that direct contact between the magnetic core and the laminate is achieved. Avoiding the external force acting directly on the circuit portion formed or provided in this laminate,
Disconnection of a circuit portion and separation of elements can be prevented, and a current detector with excellent durability can be obtained.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing one embodiment of the present invention.

FIG. 2, showing an embodiment of the present invention, is an exploded perspective view of a laminate.

FIG. 3 is an exploded perspective view showing one embodiment of the present invention.

FIG. 4 is an external perspective view showing another embodiment of the present invention.

FIG. 5 shows another embodiment of the present invention, and is an exploded perspective view of a laminate.

FIG. 6 is an exploded perspective view showing another embodiment of the present invention.

FIG. 7 is an exploded perspective view showing one structural example of a conventional current detector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Current detector 11 Print coil 12 Detection board 13 Laminated body 14 Magnetic core 15 Insulation sheet 16 Coil 21 ・ 22 ・ 23 Notch 30 Current detector 31 Reinforcement plate 33 Notch

──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Tetsuya Suzuki 5-36-11 Shimbashi, Minato-ku, Tokyo Inside Fuji Electric Chemical Co., Ltd. (72) Inventor Seiko Torii 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd. (56) References JP-A-5-126861 (JP, A) JP-A-8-233864 (JP, A) JP 6-40870 (JP, U) JP 6-870 45318 (JP, U) Actually open 1987-68265 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01R 15/20 G01R 19/00 G01R 33/06-33/09

Claims (2)

(57) [Claims] 1. A printed coil (11) in which a coil is formed in a film shape on a surface of a sheet and a detection substrate (12) for detecting magnetic flux are laminated together, and a magnetic core (14) is composed of these laminated bodies. The printed coil (11) and the detection board (12) are attached so as to sandwich the (13).
Of the magnetic core (14)
By fitting the parts, these magnetic cores
Notch for positioning with laminated body (21.22.2)
3. A current detector, wherein 3) is formed . 2. A coil is formed in a film shape on a surface of a sheet.
Printed coil (11) and detection board for detecting magnetic flux
(12) are laminated together, and the printed coil (1) is
On one side surface of a laminate (13) of 1) and the detection substrate (12)
Means that a flat reinforcing plate (31) is attached
First, sandwich these laminates and reinforcing plate
The magnetic core (14) is provided, and the reinforcing plate (3
In 1), the inner peripheral portion of the magnetic core (14) is fitted.
The positioning of the magnetic core and the reinforcing plate
A notch (33) is formed.
Current detector for.