JP2016111191A - Toroidal coil device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toroidal coil device that can increase the number of turns of a coil and increase the angle of aperture between coil pieces and can be easily clamped to an electrical wire.SOLUTION: A toroidal coil device 1A has a toroidal coil 1 obtained by arranging, along a toroidal direction TD, plural arcuate coil pieces T1, T2 which are divided on a plane orthogonal to the toroidal direction TD. Each of the coil pieces T1, T2 has a flexible board 10 having plural conductor patterns 3 which are shaped to extend in parallel to a poloidal direction PD and arranged in the direction TD, and an incision 21 for solid formation which is provided between adjacent conductor patterns 3. The board 10 is bent in the direction PD and the direction TD from the flat-plate shape state, and plural one-turn coils formed by the bending are successively connected to one another in series, thereby forming a coil having plural continuous turns. The coil pieces T1, T2 are individually configured, so that the gap between the coils can be greatly opened.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a toroidal coil device.

  2. Description of the Related Art Conventionally, a toroidal coil device including an air-core toroidal coil that does not have a magnetic circuit has been used as a current sensor that measures an alternating current flowing through an electric wire passing through the center hole. The toroidal coil is formed by bending a linear air-core solenoid coil so that its central axis is circular, and to form a toroidal coil. An air-core toroidal coil as a current sensor is also called a Rogowski coil. A toroidal coil for a current sensor forms a sheet-shaped air-core solenoid coil by, for example, a conductive pattern formed on both surfaces of a flexible sheet-shaped substrate and a conductive through hole connecting these two surfaces. Is easily formed (see, for example, Patent Document 1). However, in the toroidal coil of Patent Document 1, the presence of the land pattern for securing the connection by the conductive through hole becomes a constraint condition for the increase in the density of the conductor pattern, and the number of turns of the coil is increased beyond a certain limit. I can't. Further, the area surrounded by each one-turn coil is the sectional area of the sheet-like base material itself, and there is a limit to increasing the area.

  By the way, a plurality of conductor patterns are integrally formed on a flexible support body, and one-turn coils for each conductor pattern formed by bending the support body are connected in series to form an inductor used in a transformer or the like. There is a known method (see, for example, Patent Document 2).

JP 2008-241479 A JP 2002-043138 A

  However, in the forming method as shown in Patent Document 2 described above, although it is possible to connect by solder without using the conductive through hole, since the fitting of the slit and the claw is used in each solder connection portion, it is still The increase in the number of turns of the coil is limited. In addition, the method of forming a coil in Patent Document 2 is to form a coil on one side of a quadrangle because the one-turn coil is three-dimensionally formed, so that the area surrounded by the coil can be increased. Symmetry cannot be imparted to the toroidal coil.

    Further, when the toroidal coil is used as a current sensor for an existing electric wire, it is necessary to perform a clamping operation in which the toroidal coil is divided and opened somewhere in the toroidal direction, and the electric wire is positioned and closed at the center of the toroidal coil. The toroidal coil is desirably capable of performing a large clamping operation that opens, for example, 180 ° or more, and preferably has a repeated resistance to the clamping operation.

  The present invention solves the above-mentioned problem, and with a simple configuration, the number of turns of the coil can be increased as compared with the prior art, and the opening angle between the coil pieces is increased so that the wire is clamped. An object of the present invention is to provide a toroidal coil device that is easy to handle.

  In order to achieve the above object, a toroidal coil device of the present invention includes a toroidal coil formed by arranging a plurality of arc-shaped coil pieces divided along a surface orthogonal to the toroidal direction along the toroidal direction, and each of the coil pieces. Comprises a flexible substrate having a shape extending in the poloidal direction and provided with a plurality of conductor patterns arranged in the toroidal direction, and a three-dimensional notch provided between adjacent conductor patterns. The flexible substrate is bent in a poloidal direction and a toroidal direction from a flat plate shape, and end portions belonging to adjacent coils of a plurality of one-turn coils formed by this bending are sequentially connected in series to form a continuous multi-turn coil. It is characterized by.

  According to the toroidal coil device of the present invention, since the coil pieces obtained by three-dimensionalizing the flexible substrate are arranged to form a toroidal coil, the number of turns of the coil can be increased, and the opening angle between the coil pieces can be further increased. Is easily clamped to the electric wire.

(A) is a partially broken exploded perspective view of a toroidal coil device according to an embodiment of the present invention, and (b) is a schematic sectional view of the device. (A) is a perspective view of the apparatus, (b) is a perspective view of the coil piece of the apparatus, (c) is a perspective view of the support body of the apparatus. (A) is a top view of the solenoid coil formed by bending and electrically connecting a flexible substrate constituting the coil piece of the apparatus in a cylindrical shape, and (b) is a perspective view of the coil piece formed by bending the solenoid coil. The expanded view of the flexible substrate. (A) is sectional drawing of the connection part which electrically connected the conductor pattern of the front and back of the flexible substrate, (b) is sectional drawing of the connection part which electrically connected the conductor pattern of the flexible substrate. The perspective view explaining the structural example which combines the coil piece and a circuit board and uses the apparatus for electric current measurement. (A) is a perspective view of a toroidal coil device in which a toroidal coil and a circuit board are housed in a case and configured for current measurement, (b) is a plan view of the device attached to an electric wire, and (c). FIG. 3 is a cross-sectional view for explaining the opening / closing operation of the apparatus with respect to the electric wire. (A) is the top view of the state which opened the apparatus, (b) (c) is the perspective view of (a) seen from a different direction. (A) is sectional drawing which shows typically the modification of the toroidal coil apparatus, (b) is sectional drawing which shows a mode that the coil piece of the modification is opened and it applies to an electric wire. (A) is sectional drawing which shows the other modification of the toroidal coil apparatus typically, (b) is sectional drawing which shows a mode that the coil pieces of the modification are opened and applied to an electric wire. (A) is sectional drawing which shows the further another modification of the toroidal coil apparatus typically, (b) is sectional drawing which shows a mode that the coil pieces of the modification are opened and applied to an electric wire. (A) is sectional drawing which shows typically the toroidal coil apparatus which concerns on other embodiment, (b) is a perspective view of the support body used for the apparatus. The perspective view of the coil piece which comprises the apparatus. The figure which shows the electrical connection between the coil pieces of the apparatus. (A) is a perspective view explaining the opening / closing operation | movement of the apparatus made into the structure for electric current measurement, (b) (c) is the perspective view of the apparatus seen from the different direction. (A) is a development view of a flexible substrate constituting a toroidal coil device according to another embodiment, (b) is a plan view of a solenoid coil formed by bending the flexible substrate device, and (c) is a diagram of the solenoid coil. The perspective view of the coil piece formed by bending. (A) is sectional drawing which shows typically the measurement of the voltage which arises in each coil piece of a toroidal coil apparatus, (b) is a see-through | perspective side view of (a). FIGS. 17A and 17B are a cross-sectional view and a perspective side view schematically showing measurement performed by changing the connection method of one voltmeter in the voltage measurement of FIGS. (A) is a voltage waveform diagram measured by the voltmeter V1 of FIG. 17 (a), (b) is a voltage waveform diagram measured by the voltmeter V2 of FIG. 18 (a), and (c) is by both voltmeters. The voltage waveform figure of the sum of a measured value. 18A is a voltage waveform diagram measured by the voltmeter V1 in FIG. 18A, FIG. 18B is a voltage waveform diagram measured by the voltmeter V2 in FIG. 18A, and FIG. The voltage waveform figure of the difference of a measured value. The top view which looked at the toroidal coil of the toroidal coil device from the central axis direction. The perspective view displayed through seeing through the 1 turn coil of the toroidal coil of a toroidal coil device.

  Hereinafter, toroidal coil devices according to embodiments of the present invention will be described with reference to the drawings. 1 to 5 show a toroidal coil device 1A according to an embodiment. As shown in FIGS. 1, 2, and 3, the toroidal coil device 1A includes a toroidal coil 1 including two coil pieces T1 and T2, and a semi-cylindrical support body that supports the coil pieces T1 and T2 from the inside. And the core 4. The toroidal coil 1 is configured by arranging two arc-shaped coil pieces T1 and T2 divided along a plane orthogonal to the toroidal direction TD along the toroidal direction TD. Each of the coil pieces T1 and T2 includes a flexible substrate 10 having a sheet-like flexible base material 2 and a plurality of conductor patterns 3 that are supported by the flexible base material 2 and arranged in parallel with each other. Is bent in a toroidal shape. In these drawings and the drawings shown below, the conductor pattern 3 is appropriately omitted.

  Each of the conductor patterns 3 has a shape extending in parallel with the poloidal direction PD, and the entire conductor pattern 3 is arranged along the toroidal direction TD. The flexible substrate 2 has a notch 21 for forming a solid between adjacent conductor patterns 3. Each of the conductor patterns 3 forms a one-turn coil by bending the flexible substrate 10 from a flat plate shape to the poloidal direction PD as indicated by an arrow R. The plurality of one-turn coils arranged in parallel with each other is a solenoid coil 10a, which is a continuous coil in which ends belonging to adjacent coils are sequentially connected in series (FIG. 3A).

  The connection between the above-described one-turn coils is performed by forming a connection portion 30 in which one end and the other end of each linear conductor pattern 3 are overlapped and electrically connected between adjacent conductor patterns 3. Done. The connection portion 30 is formed at a position corresponding to the recess 4 a on the outer periphery of the core 4. The flexible substrate 10 formed into a coil having a plurality of turns is bent in the toroidal direction TD due to the presence of the notch 21 for forming a three-dimensional shape (FIG. 3B).

  Coil pieces T1 and T2 are formed for each flexible substrate 10. Each coil piece T1, T2 has terminals J1, J2 and terminals J3, J4 (collectively these are terminals Jn). The flexible substrate 10 is a multilayer substrate having conductor patterns 3 on the front and back surfaces of the flexible base material 2, and a plurality of turns of coils are formed on each surface of the front and back surfaces. It is a heavy coil. The advance coil and the return coil are connected in series with each other, and when the terminals that are not connected are, for example, the coil piece T1, they are the terminals J1 and J2.

  Each of the coil pieces T1 and T2 corresponds to each coil obtained by dividing a cylindrical toroidal coil into two by a plane PL including the central axis AX, except for terminal processing. The coil pieces T1 and T2 are arc-shaped. The coil pieces T1 and T2 are formed by bending a linear solenoid coil into a semicircular shape, generally an arc shape having an arbitrary arc length along the toroidal direction TD. This means that the shape has been changed (see FIG. 1B). In other words, the coil pieces T1 and T2 have a cut Baumkuchen shape as viewed from the direction of the central axis AX. Further, the toroidal direction TD is a circumferential direction around the central axis AX of the toroidal coil 1, and the poloidal direction PD is a direction along a line of intersection between a plane perpendicular to the toroidal direction TD and the surface of the toroid.

  Next, the flexible substrate 10 forming the coil piece T1 (T2) will be described in detail with reference to FIG. The following description is the same for the flexible substrate 10 forming the coil piece T2. The flexible substrate 10 has a substantially rectangular outer shape in a state where the flexible substrate 10 is developed in a planar shape. In the planar flexible substrate 10, the upper and lower regions are equivalent to the outer peripheral region of the toroidal coil 1 along the poloidal direction PD in the figure, and the central region is the inner peripheral region of the toroidal coil 1, that is, faces the central axis AX. It is equivalent to the area to do. The space between the outer peripheral region and the inner peripheral region corresponds to a transition region located at both ends along the central axis AX in the toroidal coil 1. Since the flexible base material 2 cannot be stretched, incisions 21 are provided in the inner peripheral region and the transition region in order to bend the flat flexible substrate 10 into a toroidal shape that is a three-dimensional curved surface. Yes. The cuts 21 form openings in which the substrate material including the flexible base material 2 is removed from the planar flexible substrate 10.

  The conductor pattern 3 is provided in a region sandwiched between the openings formed by the cuts 21. Each conductor pattern 3 has a skew-shaped pattern that changes into a crank shape so as to transfer onto an extension line of the adjacent conductor pattern 3. One end of the conductor pattern 3 is a connection terminal 3a having a flying lead structure in which the flexible substrate 2 does not exist, and the other end is a connection terminal 3b supported on the flexible substrate 2. Yes. The conductor pattern 3 has a crank-like pattern that is skewed in different directions on the front and back sides so as to form an advance coil and a return coil, respectively, on the front and back sides of the flexible substrate 10. The combination of the advance coil and the return coil corresponds to, for example, a combination of a right-handed coil and a left-handed coil. The current flowing through the coil lead wire travels along the toroidal direction while drawing a spiral in a certain rotational direction, and then returns along the toroidal direction while drawing a spiral in the same rotational direction.

  Next, electrical wiring from the terminal J1 (1a) of the coil piece T1 to the terminal J2 (1b) through each conductor pattern 3 will be described. Each one-turn coil of the coil piece T1 on the flexible substrate 10 advances from the front surface terminal 1a as shown by the solid line arrow pointing leftward, and rewinds the back surface as shown by the dotted line arrow falling rightward to reach the terminal 1b. In this case, the front coil is a lead coil and the back coil is a return coil. The advance and return of the coil is realized by a crank-shaped conductor pattern portion in the conductor pattern 3.

  Specifically, the wiring from the terminal 1a on the front surface passes through the conductor pattern 3 connected to the terminal 1a and reaches the connection terminal x2, and the connection terminal x2 is electrically connected to the connection terminal x3 of the adjacent conductor pattern 3. Connected. Note that the flexible substrate 10 is rounded into a flat cylindrical shape. Similarly, from the connection terminal x4 to the connection terminal x6 through the connection terminal x5. The tip of the connection terminal x6 is connected to the connection terminal x7, and the conductor 1c in the middle of the connection terminal x6 faces the connection terminal y2 extended from the conductor pattern 3 on the back surface due to the presence of the notch 22. Overlaid and directly connected to the conductor 1d of the connection terminal y2. The connection between the conductors 1c and 1d forms a front / back connection. The connection terminal x7 is a dummy terminal used for fixing reinforcement and shape alignment.

  Subsequently, on the back surface, the conductor pattern 3 of the connection terminal y2 is passed to the connection terminal y3, the connection terminal y3 is connected to the connection terminal y4 via the adjacent conductor pattern 3, and so on. Thus, the connection terminal y4 reaches the connection terminal y6 via the connection terminal y5. The connection terminal y6 passes through the conductor pattern 3 connected to the connection terminal y6, and reaches the terminal 1b that is the end thereof. The connection terminals xe and xo in the figure are the connection terminal 3a that is the flying lead of the conductor pattern 3 on the surface and the connection terminal 3b that is supported on the flexible substrate 2, and the connection terminals ye and yo Are those on the back.

  Next, with reference to FIG. 5, the connection part 30 of an electrical connection is demonstrated. In the case of electrical connection between the front and back sides, as shown in FIG. 5A, when the end portions of the flexible substrate 10 are brought into contact with each other and the connection terminals x6 and y2 are overlapped, the conductors of the connection terminals x6 and y2 due to the presence of the notches 22 1c and 1d are in a state of directly facing each other. Therefore, the connection part 30 which performs electrical connection from the front surface side to the back surface side is easily formed using only the flexible substrate 10 without using additional wiring. The electrical connection can be made by, for example, the solder 31. The connection part 30 is protected by a protective resin 32.

  Further, in the case of electrical connection between the front and back surfaces and between the back and back surfaces, both connections can be performed collectively as shown in FIG. Furthermore, the electrical connection between these front and back, front and back, and back and back can be performed collectively. These electrical connections are performed by batch soldering by rounding the flexible substrate 10 into a cylindrical shape so that the connection terminals 3a and 3b overlap each other with the solder paste applied to the connection terminals 3a and 3b (generic name). be able to. Further, instead of using the solder paste, the connecting terminals 3a and 3b overlapping each other may be soldered by passing through a solder bath while contacting the solder solution. Further, the connection terminals 3a and 3b may be electrically connected using a conductive adhesive or an anisotropic conductive resin. The flexible substrate 10 is not limited to the one having two conductor layers, and the one having one or three or more conductor layers is used to form a multi-turn coil in each conductor layer. can do.

  The flexible substrate 10 is configured by laminating a conductive layer of the conductor pattern 3 and an insulating resin layer of the protective film 2a on the flexible base material 2. The flexible substrate is a substrate also called a flexible printed circuit board. The flexible substrate 10 is manufactured by a general manufacturing process using, for example, a general flexible substrate having a copper foil layer on a resin sheet. The manufacturing process includes, for example, the formation of the conductor pattern 3 by patterning of copper foil, the formation of the protective film 2a by coating, laminating, patterning, etc., the formation of the cuts 21 and the outer shape, the terminals 1a, 1b and the connection terminals 3a, 3b This is a step of performing plating or the like. The manufacture of the flexible substrate 10 is not limited to such a subtracting method of removing unnecessary copper foil by patterning, but an additive method of forming a conductive pattern 3 by adding a conductive material on the flexible base 2 or Can be performed by a combination of these. For example, a polyimide resin is used for the flexible substrate 2.

  In addition, the toroidal coil device 1A does not need to include the core 4 when the shape of the toroidal coil 1 by the coil pieces T1 and T2 can be maintained by the strength of the flexible substrate 10 itself. In order to maintain the shape of the toroidal coil 1, a padding or a foam material may be simply inserted into the flexible substrate 10. The core 4 is an internal support that supports each of the coil pieces T1 and T2 on its inner surface. The support is not limited to the core 4, and an external support that supports each of the coil pieces T <b> 1 and T <b> 2 on the outer surface thereof, for example, a case that accommodates the coil piece may be used. Alternatively, the coil piece may be accommodated in a recess or a cavity having a wall surface having an outer shape of the coil piece, and the outer surface of the coil piece may be attached to the wall surface to support the coil piece. Moreover, resin etc. may be apply | coated to the inner surface and outer surface of a coil piece, and the shape of a coil piece may be maintained by using the resin etc. as a support body.

  According to the toroidal coil device 1A of the present embodiment, the toroidal coil 1 is formed by using the coil pieces T1 and T2 formed by three-dimensionally bending the flexible substrate 10, and therefore, based on the high-density pattern formation characteristics of the printed substrate. The number of turns of the coil can be increased. Further, the toroidal coil device 1 </ b> A can increase the area that each one-turn coil surrounds due to the three-dimensional structure of the toroidal coil 1. Therefore, the effect of magnetic induction can be enhanced by integrating more magnetic flux, and the magnetic performance can be improved in the same manner as the number of turns of the coil. According to the toroidal coil device 1A, the coil pieces T1 and T2 are arranged to form the toroidal coil 1, and each coil piece T1 and T2 is configured individually and independently, so that the opening angle between the coil pieces T1 and T2 can be increased. Therefore, according to the toroidal coil device 1A, it is easy to clamp the electric wire.

  Further, according to the toroidal coil device 1A, since the coil pieces T1 and T2 are individualized, the opening and closing shafts for opening and closing the toroidal coil 1 for the clamping operation are used as the terminals in the coil pieces T1 and T2. It can be set to the part where Jn is located. This is because the terminal Jn can be formed by extending the flexible substrate 10 to a region away from the conductor pattern 3 in each coil piece. That is, the opening / closing axis can be set in a region away from the region of the flexible substrate 10 on which the conductor pattern 3 forming the one-turn coil is disposed. With such a configuration, it is possible to prevent stress generated when the clamping operation is repeated from being applied to the flexible substrate 10 forming the toroidal coil 1, and to prevent problems such as disconnection of the conductor pattern 3 due to repeated opening and closing. it can.

(Toroidal coil device for current measurement)
6, 7 and 8 show a toroidal coil device 1A according to another embodiment. As shown in FIG. 6, the toroidal coil device 1A of the present embodiment includes a circuit board 6 having a circuit for processing a voltage signal generated in the toroidal coil 1 including the coil pieces T1 and T2 in the above-described embodiment. This is referred to as a current measuring device 1B. As shown in FIGS. 7 and 8, the current measuring device 1 </ b> B can include a toroidal case 5 that houses the toroidal coil 1. The case 5 has a toroidal main body 50 and a substrate storage 51 for storing the circuit board 6. The circuit board 6 and the coil pieces T1 and T2 are electrically connected to each other by a terminal Jn. The circuit board 6 includes a circuit that receives and processes the output from the toroidal coil formed by the coil pieces T1 and T2. The case 5 protects the toroidal coil 1 from the environmental atmosphere and external force, and facilitates the operation when the toroidal coil 1 is clamped to the electric wire. The case 5 serves as a clamp cover for constituting a clamp-type ammeter.

  The main body 50 is configured by combining a split case 50b having a shape divided into two along a split surface 50a including the central axis of the toroid. More generally speaking, the case 5 is configured by combining a plurality of divided cases that house each of the coil pieces. Each divided case 50b accommodates each of the coil pieces T1 and T2. One split case 50 b is integrated with the substrate storage portion 51. The split case 50b has two types of connecting portions that connect each of them at the outer peripheral edge of the toroid. One is a hinge 5a having a hinge structure that can be opened and closed between the divided cases 50b, and the other is a pair of a claw 5b and a hook 5c that constitute an engaging structure that can be separated between the divided cases 50b. is there. These split cases 50b can be opened until the angle between the split surfaces is 180 ° or more.

  The partition surface 50a of the case 5 is provided with a partition wall 52 that protects the flexible substrate 10 accommodated in the case 5 from being exposed when the case 5 is opened. The partition wall 52 can be formed by attaching a sheet material, providing a coating film, or filling a sealing material. The main body 50 is configured to ensure the symmetry of the toroidal coil 1 (symmetry around its rotation axis, symmetry between each one-turn coil, symmetry of the pitch between coils, etc.). For example, each split surface 50a is configured to be joined with a flatness equal to or less than the pitch of one turn coil. In order to make the pitch between the coils more constant, the partition wall 52 is made as thin as possible. In addition, the case 5 may be provided with an engaging concavo-convex structure that can be positioned or a fitting structure in place of the plane division surface so that the positional deviation of the opening / closing surface does not occur.

  The toroidal coil device 1 </ b> A, which is such a current measuring device 1 </ b> B, can be used to measure an alternating current flowing through the wire by attaching and detaching to the wire. In this case, electronic elements necessary for current detection, such as a transistor and an integrator, are mounted on the circuit board 6 in the board housing portion 51. In addition, the board housing 51 is provided with a socket having terminal pins for inputting power to the circuit board 6 and inputting / outputting signals, or a drawer for electrical connection drawn from the circuit board 6 to the outside of the case 5. Lines can be provided.

  According to such a current measuring device 1B (toroidal coil device 1A), it is possible to open and close at a large angle by the divided structure using the coil pieces T1 and T2, and the opening and closing function allows the current measuring device 1B to be centered from the outer peripheral side. The electric wire 9 can easily enter and exit from the shaft side. Thereby, it can use for the use which performs the current measurement and electric power measurement of the electric wire already installed. Moreover, since it has the hinge 5a and the nail | claw 5b and the hook 5c, when changing the electric wire used as the object of electric current measurement, the same individual | organism | solid can be repeatedly used easily. The current measuring device 1B outputs a signal corresponding to a time change of the magnetic field based on a change in the current flowing through the electric wire 9 inserted through the central hole as a current measurement result to the outside through the circuit board 6.

(Various variations)
9, 10 and 11 show a modification of the toroidal coil device 1A. These modifications focus on the coil structure of the coil pieces T1, T2 in a state where the toroidal coil is divided into two and the connection structure between the coils. The coil pieces T1 and T2 of the toroidal coil device 1A shown in FIG. 9 have a unidirectional coil structure of only one of the advance coil and the return coil. Since the terminals of the coil pieces T1 and T2 are separated from each other at both ends of each coil, the coil pieces T1 and T2 are connected to each other using an external line connecting the terminals J2 and J3 as shown in the figure. The toroidal coil device 1A can be obtained. However, since the terminal J2 and the terminal J3 are terminals belonging to 9 different coil pieces, a long external line that does not block the entry path is necessary to allow the electric wire 9 to enter the center of the toroidal coil device 1A. It is.

  A coil piece T1 of the toroidal coil device 1A shown in FIG. 10 has two coils, a lead coil and a return coil, which are independent from each other, and terminals in each coil exist apart from each other. Since the advance coil and the return coil belong to the same coil piece T1, the terminals J2 and J3 which are close to each other can be connected, and as a result, one coil having the terminals J1 and J4 which are close to each other is obtained. Can do. The same applies to the coil piece T2. Therefore, the toroidal coil device 1A in which the coil pieces T1 and T2 are connected between the terminals J4 and J5 can be obtained. Terminals J2 and J3 that can be externally connected can be used for performance evaluation and failure diagnosis of the toroidal coil device 1A. A toroidal coil device 1A shown in FIG. 11 is the same as the toroidal coil device 1A shown in FIG. 10 except that a lead coil and a return coil of one coil piece T1 are connected inside.

(Other embodiments)
12 to 15 show a toroidal coil device 1A according to another embodiment and a current measuring device 1B that uses the toroidal coil device 1A for current measurement. As shown in FIGS. 12, 13, and 14, the toroidal coil device 1 </ b> A includes coil pieces T <b> 1 and T <b> 2 made of four divided pieces of toroidal coil and a coil piece T <b> 3 made of two divided pieces. The coil pieces T1, T2, T3 include a core 4 having a shape corresponding to the shape of each coil piece.

  Each of the coil pieces T1, T2, T3 has both a lead coil and a return coil. The advance coil and the return coil of the coil pieces T1, T2 are connected in series inside, and the advance coil and the return coil of the coil piece T3 are connected in series to the coils of the other coil pieces T1, T2 at the external part. . Terminals J1 and J8 are output terminals of the toroidal coil device 1A, and are connected to the circuit board 6 (FIG. 15).

  As shown in FIG. 15, a toroidal coil device 1A including a case 5 and a circuit board 6 in the toroidal coil 1 is used as a current measuring device 1B. The case 5 has a toroidal main body portion and a substrate storage portion for storing the circuit board 6. The circuit board 6 is electrically connected to the toroidal coil 1 and includes a circuit that processes the output of the coil.

  The main body 50 is divided into a shape that accommodates the coil pieces T1, T2, and T3, and has three divided cases. The divided cases are connected to each other by a hinge 5a so as to be freely opened and closed. Moreover, the division | segmentation case has a nail | claw and hook which mutually engage in order to maintain a closed state, and also has a partition so that a flexible substrate may not be exposed. This case 5 corresponds to the two-divided case 5 shown in FIG. The three split cases can be opened until the angle between the split surfaces is 180 ° or more in a state where the coil pieces T1, T2, and T3 are housed. Note that such a toroidal coil device 1A and current measuring device 1B are not limited to being divided into two or three, and can be formed into a divided shape using an arbitrary number of coil pieces.

(Still another embodiment pressure)
FIG. 16 shows a toroidal coil device 1A according to still another embodiment. In this toroidal coil device 1A, the two coil pieces T1 and T2 of the toroidal coil device 1A shown in FIG. 1 are configured by two flexible substrates 10 separated from each other. A substrate 10 is used. That is, in the flexible substrate 10 forming the coil pieces T1 and T2, the terminals J2 of the coil piece T1 and the terminals J3 of the coil piece T2 are connected by a conductor pattern, and the flexible base material is also connected. . Further, in the region where the terminals J1 and J4 are formed, the flexible base materials extending from the coil pieces T1 and T2 are connected to each other. Accordingly, the toroidal coil device 1A is formed by forming coil pieces T1 and T2 from a single flexible substrate having two layers, front and back, and a lead coil and a return coil connected in series with each other between terminals J1 and J4. It is what you have.

  Similar to the toroidal coil device 1A of each embodiment described above, the toroidal coil device 1A of the present embodiment includes two arc-shaped coil pieces T1 and T2 divided by a plane orthogonal to the toroidal direction along the toroidal direction. A toroidal coil formed side by side is provided. Each of the coil pieces T1 and T2 has a shape divided from a toroidal coil, but the flexible boards 10 constituting each coil piece are not necessarily separated from each other.

  According to such a toroidal coil device 1A, since the extended portion of the flexible substrate 10 on which the terminals J1 to J4 are formed is provided as a deformation region for folding or folding, the coil pieces T1 and T2 are 180 ° or more. Can be opened and closed at an opening angle. This is because although the flexible substrate 10 is not separated from each other, the independence between the coil pieces T1 and T2 is sufficiently secured by the presence of the extended terminals J1 to J4. Since the flexible substrate 10 is not separated, electrical connection between the terminals J2 and J3 can be performed only by forming a conductor pattern on the flexible substrate 10, and an external connection line is soldered to connect the terminals J2 and J3. No need to connect the. Such a structure of the toroidal coil device 1A can also be applied to the case where the coil pieces T1, T2, T3 divided into three parts shown in FIG. The shape and arrangement of the terminals J1 to J4, more generally the terminal Jn, can be appropriately determined according to, for example, the use of the toroidal coil 1 and the connection structure with the circuit board 6.

(Voltage generated in the coil piece)
FIGS. 17 to 20 show voltages generated in the coil pieces T1 and T2 in a state where the toroidal coil of the toroidal coil device 1A is divided into two. The coil pieces T1 and T2 have a symmetric structure with each other and have a configuration in which an advance coil and a return coil are connected in series. The electric wire 9 to be measured for current passes through the center position of the toroidal coil device 1A, and the electric wire 9x for non-measurement is located outside the side of the coil piece T2 of the toroidal coil device 1A. It is assumed that the electric wire 9 and the electric wire 9x are parallel to each other and an in-phase alternating current flows.

  In FIG. 17, the voltmeters V1 and V2 are connected to the coil pieces T1 and T2 so as to detect the voltage caused by the current flowing through the electric wire 9 in the same phase. In FIG. 18, the polarity of the connection of the voltmeter V2 to the coil piece T2 in FIG. 17 is reversed. That is, the voltmeters V1 and V2 are connected to the coil pieces T1 and T2 so as to detect the voltages caused by the currents flowing in the electric wires 9 in the opposite phase.

  FIG. 19 shows the voltage measurement results in the case of FIG. As shown in FIG. 19A, the voltage V1 includes the voltage v1 due to the current of the electric wire 9 and the voltage u1 due to the electric wire 9x in the same phase. The voltages v1 and u1 are not separated and the sum of these voltages is measured as voltage V1 = v1 + u1. Further, as shown in FIG. 19 (b), the voltage V2 includes a voltage v2 due to the current of the electric wire 9 and a voltage u2 due to the electric wire 9x in opposite phases. Here, V2 = v2 + u2 as in the case of V1. Here, when (V1 + V2) is calculated, as shown in FIG. 19C, a voltage (v1 + v2) due to the current of the electric wire 9 is obtained, and the voltage (u1 + u2) due to the electric wire 9x cancels each other and becomes a small value.

  FIG. 20 shows the voltage measurement results in the case of FIG. In this case, as shown in FIGS. 20A and 20B, the voltages v1, u1, and u2 are in phase, and only the voltage v2 is in reverse phase. Therefore, as shown in FIG. 20 (c), by calculating (V1-V2), the voltage (v1-v2) due to the current of the wire 9 is obtained, and the voltage (u1-u2) due to the wire 9x cancels each other. And become a small value.

  The sum of the voltage V1 and the voltage V2 (V1 + V2) = V and the difference (V1−V2) = V are usually determined by the series connection method of the coil pieces T1 and T2 and the single connection between the coil pieces T1 and T2 connected in series. By appropriately selecting the connection method with the voltmeter, it is automatically obtained as a measurement value. In other words, when the coil pieces T1 and T2 do not have a symmetric structure, the connection method between the coil pieces T1 and T2 and the voltmeter, for example, the circuit board 6 described above is selected as appropriate. The electric current of the electric wire 9 can be measured appropriately. This can be easily applied to the case where the two coil pieces T1 and T2 are configured by using two types of coil pieces T1 and inverting each other and combining them.

(Still another embodiment)
FIG. 21 shows still another embodiment. In the toroidal coil 1 in the present embodiment, each of the one-turn coils CL is disposed at a constant interval along the toroidal direction TD. In other words, each one-turn coil CL is formed by the conductor pattern 3, and each conductor pattern 3 is arranged at regular intervals along the circumferential toroidal direction TD. In any cross section orthogonal to the central axis AX of the toroidal coil 1, each of the conductor patterns 3 exists on the circumference at regular intervals.

  The above-described constant interval differs between the inner circumferential side interval p1 and the outer circumferential side interval p2 of the toroidal coil 1 (p1 ≦ p2), and generally differs when the cross-sectional position is different. Here, the intervals p1 and p2 are defined by the distance between the center positions of the widths of the respective conductor patterns 3, for example. In addition, the center of the width of each conductor pattern 3 will appear at a different position if the cross-sectional position is different due to the presence of a crank-like pattern and connection terminals for connecting each one-turn coil CL, The interval on the circumference in each cross section is constant.

  In addition to FIG. 21, as shown in FIG. 22, in the flexible substrate 10 (toroidal coil 1) of the present embodiment, each one-turn coil CL is arranged in a plane PL including the central axis AX. The conductor pattern 3 constituting each one-turn coil CL is located in the plane PL except for a transition pattern 3c which is a crank-shaped pattern for connecting the one-turn coils. When one 1-turn coil CL on the flexible substrate 10 is viewed from the position of the central axis AX, the conductor pattern 3 on the inner side and the conductor pattern 3 on the outer side of the one-turn coil CL appear to overlap each other.

  Further, the number of one-turn coils CL, and hence the number of conductor patterns 3 may be an odd number, but as shown in FIG. 22, in the case of an even number, two one-turn coils CL exist in the plane PL. It is more preferable in terms of symmetry than in the case of an odd number. Furthermore, the configuration in which each of the one-turn coils CL is arranged at a constant interval along the toroidal direction TD or arranged in the plane PL including the central axis AX is a toroidal using the multilayer flexible substrate 10. It can also be applied to the coil 1. In this case, the conductor patterns 3 and the one-turn coil CL formed on both surfaces or a plurality of conductor layers are arranged at regular intervals for each conductor layer in the flexible substrate 10 or include the central axis AX. What is necessary is just to set it as the structure arrange | positioned in the plane PL.

  The present invention is not limited to the above-described configuration, and various modifications can be made. For example, the configurations of the above-described embodiments can be combined with each other. Further, instead of using a single flexible substrate 10 as a coil piece, for example, a plurality of flexible substrates 10 divided in a toroidal direction or a poloidal direction may be used as the coil piece. In addition to making the flexible substrate 10 itself a multilayer, the flexible substrate 10 may be stacked in multiple layers, that is, the coil pieces may be formed in a nested state. The number of turns of the coil can be increased by multiplexing the flexible substrate 10.

DESCRIPTION OF SYMBOLS 1 Toroidal coil 1A Toroidal coil apparatus 1B Current measuring apparatus 10 Flexible substrate 21 Cutting 3 Conductor pattern 4 Core (support body)
5 Case 5a Hinge (hinge structure)
5b Claw (engagement structure)
5c Hook (engagement structure)
50b Division case 6 Circuit board 9 Electric wire AX Central axis CL 1 turn coil PD Poloidal direction PL Plane including central axis T1, T2, T3 Coil piece TD Toroidal direction

Claims (10)

A toroidal coil device,
A toroidal coil comprising a plurality of arc-shaped coil pieces divided along a plane perpendicular to the toroidal direction along the toroidal direction,
Each of the coil pieces has a shape extending in the poloidal direction, and has a plurality of conductor patterns arranged in the toroidal direction, and a flexible three-dimensional notch provided between adjacent conductor patterns. A plurality of one-turn coils that are bent in the poloidal direction and the toroidal direction from a flat plate shape, and end portions belonging to adjacent coils of the one-turn coil formed by this bending are sequentially connected in series to each other; A toroidal coil device characterized by being a coil of a turn.   The toroidal coil device according to claim 1, further comprising a support body that supports each of the coil pieces on an inner surface thereof.   The toroidal coil device according to claim 1, wherein the conductor pattern is formed in a multilayer on the flexible substrate.   The toroidal coil device according to any one of claims 1 to 3, wherein the toroidal coil includes a lead coil and a return coil.   The toroidal coil device according to any one of claims 1 to 4, wherein each of the one-turn coils is disposed at a constant interval in the toroidal direction.   6. The toroidal coil device according to claim 1, wherein each of the one-turn coils is disposed in a plane including a central axis of the toroidal coil. A toroidal case for housing the toroidal coil;
The toroidal coil device according to any one of claims 1 to 6, wherein the case is formed by combining a plurality of divided cases for storing the coil pieces. A circuit board having a circuit for processing a voltage signal generated in the toroidal coil;
The toroidal coil device according to claim 7, wherein the case houses the circuit board.   9. The toroidal coil device according to claim 8, wherein the circuit board includes a circuit that outputs a signal corresponding to a current flowing through an electric wire inserted through the toroidal coil. The split case has a connecting portion that connects each at an outer peripheral edge,
The said connection part has a hinge structure which can open and close between the said division | segmentation cases, or an engagement structure which can isolate | separate between the said division | segmentation cases. The toroidal coil device described.

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