JP2014119390A - Current sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a current sensor allowing the size of a hollow part to be easily adjusted.SOLUTION: While at least one of first and second components 20a, 20b, 30a, 30b constituting a main member 10 is bent, one end of the first component 20a, 20b and one end of the second component 30a, 30b are fixed, and the other end of the first component 20a, 20b and the other end of the second component 30a, 30b are fixed, to form a hollow part 11 inside and a coil pattern 12 surrounding the hollow part 11. When at least one of the first and second components 20a, 20b, 30a, 30b is bent to form the hollow part 11, the size of the hollow part can be easily adjusted by changing the bend size.

Description

  The present invention relates to a current sensor in which a hollow portion into which a detection target body through which a current flows is inserted is formed in a main member and a coil pattern surrounding the hollow portion is formed.

  Conventionally, as a current sensor for measuring a current flowing through a detection object, for example, a through-type current sensor has been proposed in Patent Document 1.

  Specifically, this current sensor has flexibility and is configured using a substrate on which a coil pattern is formed from one end to the other end. Then, the substrate is bent so as to have a cylindrical shape, and one end portion and the other end portion of the substrate are fixed by the joining member, thereby forming a hollow portion surrounded by the coil pattern. In other words, the coil pattern is formed so as to surround the cavity. Note that the joining member is a box-shaped housing, and an insertion hole into which one end and the other end of the substrate are inserted, and the end and the other end are wound in a belt shape so that these ends are wound. A fixing member or the like to be fixed is formed.

  Such a current sensor is used in a state in which the detection object is inserted into the cavity, and when a current flows through the detection object, the magnetic field around the detection object (cavity) changes, so that it corresponds to the magnetic field. Output sensor signal.

JP 2008-241479 A

  However, in the current sensor, the size of the cavity must be adjusted by changing the winding amount of the substrate (one end portion and the other end portion) wound around the fixing member. For this reason, at present, a current sensor that can easily adjust the size of the cavity is required.

  In view of the above points, an object of the present invention is to provide a current sensor that can easily adjust the size of a cavity.

  In order to achieve the above object, according to the first aspect of the present invention, the first and second components (20a, 20b, 30a) having flexibility and having one end and the other end opposite to the one end are provided. 30b), a coil pattern (12) formed on the main member, and a rewind wire (13) formed inside the coil pattern and connected to the coil pattern, It has the following features.

  That is, the main member is fixed with one end of the first component and one end of the second component in a state where at least one component is bent, and the other end of the first component A cavity (11) is formed inside by fixing the other end of the second component part, and the coil pattern is formed so as to surround the cavity.

  According to this, the cavity is formed by bending at least one of the first and second components, and the size of the cavity can be easily adjusted by changing the size (amount of deflection) to be bent. can do.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

(A) is a schematic front view of the current sensor in 1st Embodiment of this invention, (b) is a schematic plan view of the 1st board | substrate shown to (a). It is sectional drawing along the II-II line in FIG.1 (b). It is sectional drawing along the III-III line in FIG.1 (b). It is a figure which shows the use condition of the current sensor shown in FIG. It is a figure which shows the sensor signal output from a 1st, 2nd coil pattern. (A) is a schematic front view of the current sensor in 2nd Embodiment of this invention, (b) is a schematic plan view of the current sensor shown to (a). (A) is a schematic front view of the current sensor in 3rd Embodiment of this invention, (b) is a schematic plan view of the current sensor shown to (a).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other will be described with the same reference numerals.

(First embodiment)
A first embodiment of the present invention will be described with reference to the drawings. The current sensor of the present embodiment is preferably used for, for example, a device that measures a current flowing through a detection object such as a bus bar connected to an in-vehicle battery or the like.

  As shown in FIG. 1, in the current sensor of the present embodiment, a cavity 11 is formed inside the main member 10, and a coil pattern 12 is formed on the main member 10 so as to surround the cavity 11. A rewind line 13 connected to the coil pattern 12 is formed inside the coil pattern 12. In the present embodiment, the main member 10 is configured using a first substrate 20a corresponding to the first component of the present invention and a second substrate 30a corresponding to the second component of the present invention.

  The first substrate 20a is configured by forming a first coil pattern 21 and a first rewind wire 22 on a rectangular plate-like multilayer substrate having flexibility. Specifically, as shown in FIGS. 2 and 3, the first coil pattern 21 is connected to a wiring pattern 21a formed in the multilayer substrate and an interlayer connection portion 21b that electrically connects the layers of the multilayer substrate. Has been configured. Then, one end of the first substrate 20a in the longitudinal direction (the end on the right side in FIG. 1 (a)) is one end, and the other end (the end on the left side in FIG. 1 (a)). Is the pattern wound around the right-hand side from one end to the other end.

  The first rewind wire 22 is composed of a wiring pattern 21a formed in the multilayer substrate. And it connects with the edge part of the 1st coil pattern 21 in the other end part of the 1st board | substrate 20a, and is formed in the inside of the 1st coil pattern 21 to the one end part along the axis | shaft which passes along the center of the 1st coil pattern 21. Yes.

  Similar to the first substrate 20a, the second substrate 30a is configured by forming a second coil pattern 31 and a second rewind wire 32 on a flexible rectangular plate-like multilayer substrate. The second coil pattern 31 and the second rewind line 32 are not particularly shown, but, like the first coil pattern 21 and the first rewind line 22, the wiring pattern formed in the multilayer substrate and the interlayer of the multilayer substrate are not illustrated. It is comprised by the interlayer connection part electrically connected.

  Then, one end of the second substrate 30a in the longitudinal direction (the end on the right side in FIG. 1 (a)) is one end, and the other end (the end on the left side in FIG. 1 (a)). Is the other end portion, the second coil pattern 31 is a pattern wound left-handed from one end portion toward the other end portion. That is, the winding direction of the first coil pattern 21 and the second coil pattern 31 is reversed from one end to the other end.

  The first substrate 20 a and the second substrate 30 a have the same size, and the number of turns and the inner diameter of the second coil pattern 31 are the same as those of the first coil pattern 21.

  Further, the second rewind line 32 is configured by a wiring pattern formed in the multilayer substrate similarly to the first rewind line 22, and the second coil pattern 31 is formed at the other end of the second substrate 30a. It is connected to the end portion and is formed to one end portion along an axis passing through the center of the second coil pattern 31.

  The multilayer substrates constituting the first and second substrates 20a and 30a are integrated in a state in which a plurality of thermoplastic resin films are laminated, and a coil pattern and a winding are formed by the wiring pattern 21a and the interlayer connection portion 21b. It is configured using PALAP (registered trademark) or the like that can form a return line.

  In addition, connection terminals 23 electrically connected to the first and second coil patterns 21 and 31 and the first and second rewind lines 22 and 32 are respectively provided at one end portions of the first and second substrates 20a and 30a. , 33 are provided. Although the connection terminals 23 and 33 are shown in a simplified manner in FIG. 1, for example, a so-called concentric axis line in which an outer conductor is disposed around an inner conductor via an insulating film is used. For example, soldering is performed so that the inner conductor is electrically connected to the first and second coil patterns 21 and 31, respectively, and the outer conductor is electrically connected to the first and second rewind wires 32, respectively. For example, the first and second substrates 20a and 30a are provided at one end.

  As shown in FIG. 1, the first and second substrates 20a and 30a formed in this way are bent so that the cavity 11 is formed between the first and second substrates 20a and 30a. In this state, both ends are fixed by the joining member 40.

  Specifically, the first and second substrates 20a and 30a are stacked in the stacking direction of the multilayer substrates (the vertical direction on the paper surface in FIG. 1). The first substrate 20a is bent so that the substantially central portion is displaced to the opposite side to the second substrate 30a side, and the second substrate 30a is displaced to the opposite side to the first substrate 20a side. Is bent. Thereby, the cavity 11 is formed between the substantially central portion of the first substrate 20a and the substantially central portion of the second substrate 30a. That is, the cavity 11 is formed inside the main member 10.

  The first and second substrates 20a and 30a are in contact with each other at both ends. That is, the first coil pattern 21 and the second coil pattern 31 are disposed adjacent to each other at both ends of the first and second substrates 20a and 30a, and the first rewind line 22 and the second rewind line. 32 are arranged adjacent to each other.

  For this reason, the part formed in the one end part side of the 1st board | substrate 20a among the 1st coil patterns 21 and the part formed in the one end part side of the 2nd board | substrate 30a among the 2nd coil patterns 31 are capacity | capacitance. Are combined. Similarly, the part formed in the other end part side of the 1st board | substrate 20a among the 1st coil patterns 21, and the part formed in the other end part side of the 2nd board | substrate 30a among the 2nd coil patterns 31 Are capacitively coupled.

  Moreover, the part currently formed in the one end part side of the 1st board | substrate 20a among the 1st rewind lines 22, and the part currently formed in the one end part side of the 2nd board | substrate 30a among the 2nd rewind lines 32 are. Capacitively coupled. Similarly, the portion formed on the other end side of the first substrate 20a in the first rewind line 22 and the other end portion side of the second substrate 30a in the second rewind line 32 are formed. The part is capacitively coupled.

  As described above, the first coil pattern 21 and the second coil pattern 31 have the winding directions opposite to each other and the same inner diameter. Therefore, the first coil pattern 21 and the second coil pattern 31 can be regarded as a continuous coil pattern 12. Similarly, the first rewind line 22 and the second rewind line 32 can be regarded as a continuous rewind line 13.

  That is, it can be said that the coil pattern 12 is formed on the main member 10 so as to surround the cavity portion 11 and the rewind wire 13 connected to the coil pattern 12 is formed inside the coil pattern 12.

  The joining members 40 provided at both ends of the main member 10 have a bottomed cylindrical shape each having a hollow inside. Then, one end and the other end of the first and second substrates 20a and 30a are fixed by being press-fitted into the cavity of the joining member 40, respectively. The connection terminals 23 and 33 provided at one end of the first and second substrates 20a and 30a are pulled out to the outside of the joining member 40 through a through hole (not shown) formed in the bottom of the joining member 40. Yes.

  As the bonding member 40, it is preferable to use a material that hardly generates stress with the main member 10. For example, when the first and second substrates 20a and 30a are made of PLAAP or the like, the main component of PALAP is used. It is preferable to use the same material as the thermoplastic resin film.

  As described above, the current sensor of this embodiment is configured. As shown in FIG. 4, such a current sensor is used in a state in which a detection target 50 such as a bus bar is inserted into the cavity 11, and a magnetic field that changes depending on the current flowing through the detection target 50. In response, sensor signals are output from the first and second coil patterns 21 and 31.

  Specifically, as described above, the winding directions of the first and second coil patterns 21 and 31 formed on the first and second substrates 20a and 30a are opposite to each other. Therefore, if the sensor signal output from the first coil pattern 21 is CH1, and the sensor signal output from the second coil pattern 31 is CH2, the sensor signal output from the first coil pattern 21 is shown in FIG. The sensor signal CH1 and the sensor signal CH2 output from the second coil pattern 31 are signals having the same sign. Accordingly, by calculating the sum of the sensor signals output from the first and second coil patterns 21 and 31, the current flowing through the detected object 50 is measured.

  As described above, the current sensor according to the present embodiment includes the main member 10 using the first and second substrates 20a and 30a, and the first and second substrates 20a and 30a are bent to be inside. A cavity 11 is formed. For this reason, the size of the cavity 11 can be easily adjusted by changing the size to be bent (the amount of bending), and thus the degree of freedom of the size of the detected object 50 and the location where the current sensor is arranged can be increased. It can also be improved.

  In the above, the substantially central portion of the first substrate 20a is bent so as to be displaced to the opposite side to the second substrate 30a, and the substantially central portion of the second substrate 30a is displaced to the opposite side to the first substrate 20a. Although the example which forms the cavity part 11 inside the main member 10 by making it bend was demonstrated, you may make it as follows.

  For example, the substantially central portion of the first substrate 20a is bent in the direction perpendicular to the stacking direction of the first and second substrates 20a and 30a (the direction perpendicular to the sheet of FIG. 1A), and the substantially central portion of the second substrate 30a is bent. The hollow portion 11 may be formed inside the main member 10 by bending in the direction opposite to the bending direction of the first substrate 20a. Alternatively, the hollow portion 11 may be formed inside the main member 10 by bending only one of the substantially central portions of the first and second substrates 20a and 30a.

(Second Embodiment)
A second embodiment of the present invention will be described. In the present embodiment, the main member 10 is configured as a single substrate with respect to the first embodiment, and the other parts are the same as those in the first embodiment, and thus the description thereof is omitted here.

  As shown in FIG. 6, in the present embodiment, the main member 10 is composed of one rectangular plate-like multilayer substrate. Then, when one end in the longitudinal direction of the main member 10 (the end on the right side in FIG. 6) is one end, and the other end (the left end in FIG. 6) is the other end, A slit 14 is formed in the main member 10 along the longitudinal direction from the other end toward the one end. The slit 14 does not reach one end of the main member 10, and the main member 10 is integrated at one end.

  In the following, one of the main members 10 that is separated by a virtual line that passes through the slit 14 and extends in the longitudinal direction of the main member 10 (the left-right direction in the drawing in FIG. 6) (upper side in the drawing in FIG. 6). Is the first region 20b, and the other region (the region below the page in FIG. 6) is the second region 30b. In the present embodiment, the first region 20b corresponds to the first component of the present invention, and the second region 30b corresponds to the second component of the present invention.

  In the first region 20b, a first coil pattern 21 wound clockwise is formed from one end to the other end. Further, the first winding is connected to the end of the first coil pattern 21 at the other end of the first region 20b, and reaches the one end along the axis passing through the center of the first coil pattern 21 inside the first coil pattern 21. A return line 22 is formed.

  In the second region 30b, a second coil pattern 31 is formed that is wound in a counterclockwise direction from one end to the other end. Further, the second winding is connected to the end of the second coil pattern 31 at the other end of the second region 30b, and reaches the one end along the axis passing through the center of the second coil pattern 31 inside the second coil pattern 31. A return line 32 is formed.

  The first and second coil patterns 21 and 31 are capacitively coupled at both ends of the main member 10. Similarly, the first and second rewind wires 22 and 32 are also capacitively coupled at both ends of the main member 10.

  In addition, the main member 10 has the other end portion joined to the joining member 40 in a state where the substantially central portion of the first region 20b is bent in the normal direction with respect to the plane of the main member 10 (the vertical direction in FIG. 6A). It is fixed at.

  Even in such a current sensor, since the cavity portion 11 is formed by bending the first region 20b, the same effect as in the first embodiment can be obtained.

  In the above description, the hollow portion 11 may be formed by bending the substantially central portion of the second region 30b in a direction opposite to the direction in which the first region 20b is bent. The substantially central portion of the first region 20b may be bent to the opposite side to the second region 30b side to form the cavity 11, or the substantially central portion of the first region 20b may be opposite to the second region 30b side. The cavity 11 may be formed by bending the second region 30b toward the side opposite to the first region 20b side.

(Third embodiment)
A third embodiment of the present invention will be described. In the present embodiment, the formation location of the slit 14 is changed with respect to the second embodiment, and the others are the same as those in the second embodiment, and thus the description thereof is omitted here.

  As shown in FIG. 7, in the present embodiment, the slit 14 is formed from one end to the other end, and the first region 20b and the second region 30b are integrated at the other end. .

  The first coil pattern 21 and the second coil pattern 31 are actually formed continuously at the other end of the main member 10. The first rewind line 22 and the second rewind line 32 are actually formed continuously at the other end of the main member 10. That is, the rewind wire 13 is connected to the coil pattern 12 at one end portion in the second region 30b and formed from the other end portion to the one end portion of the first region 20b after being formed to the other end portion of the second region 30b. Has been.

  The first and second coil patterns 21 and 31 are capacitively coupled at one end of the main member 10, and the first and second rewind wires 22 and 32 are also capacitively coupled at one end of the main member 10. ing.

  The main member 10 has one end portion thereof connected to the joining member 40 in a state in which the substantially central portion of the first region 20b is bent in the normal direction to the plane of the main member 10 (vertical direction in FIG. 7A). Is fixed.

  Even in such a current sensor, since the cavity portion 11 is formed by bending the first region 20b, the same effect as in the first embodiment can be obtained.

(Other embodiments)
In the first embodiment, the example in which the first and second substrates 20a and 30a are used as the first and second components has been described, but the following may be employed. That is, as the first and second components, concentric axes in which an outer conductor is formed in a coil shape around the inner conductor via an insulating film, and the inner conductor and the outer conductor are connected at one end may be used. . Even if the first and second components are configured using the concentric axes in this way, the inner conductor and the outer conductor are capacitively coupled at both ends as in the first embodiment, and at least one of them is By forming the cavity 11 by bending, the same effect as in the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 10 Main member 11 Cavity part 12 Coil pattern 13 Rewind wire 20a 1st board | substrate (1st structure part)
20b 1st area | region (1st structure part)
30a Second substrate (second component)
30b 2nd area | region (2nd structure part)

Claims (5)

A main member (10) that is flexible and includes first and second constituent parts (20a, 20b, 30a, 30b) having one end part and the other end part opposite to the one end part; ,
A coil pattern (12) formed on the main member;
A rewind line (13) formed inside the coil pattern and connected to the coil pattern;
The main member is fixed in a state where at least one of the first and second components is bent, and one end of the first component and one end of the second component are fixed. A cavity (11) is formed inside by fixing the other end of the first component and the other end of the second component,
The current sensor, wherein the coil pattern and the rewind wire are formed so as to surround the cavity. A first coil pattern (21) is formed on the first component from the one end to the other end of the first component, and is formed inside the first coil pattern. A first rewind line (22) connected to the first coil pattern at the end and extended to the one end is formed,
In the second component, a second coil pattern (31) is formed from the one end to the other end in the second component, and is formed inside the second coil pattern. A second rewind line (32) connected to the second coil pattern at the end and extended to the one end is formed,
The first coil pattern and the second coil pattern have opposite winding directions and the same inner diameter,
A portion of the first coil pattern formed on one end of the first component and a portion of the second coil pattern formed on one end of the second component are capacitively coupled. A portion of the first coil pattern formed on the other end side of the first component portion and a portion of the second coil pattern formed on the other end portion side of the second component portion. The coil pattern is configured by being capacitively coupled to the portion being
A portion of the first rewind line formed on one end side of the first component and a portion of the second rewind wire formed on one end side of the second component. A portion that is capacitively coupled and formed on the other end side of the first component in the first rewinding and formed on the other end side of the second component in the second rewinding 2. The current sensor according to claim 1, wherein the rewinding wire is configured by capacitively coupling with a portion that is provided. 3.   The current sensor according to claim 2, wherein one end of the first component and one end of the second component are integrated. The other end of the first component and the other end of the second component are integrated,
The coil pattern is formed from the one end to the other end in the first component and continuously formed from the other end to the one end in the second component. A portion formed on one end of the portion and a portion formed on the one end of the second component are capacitively coupled,
The rewind line is connected to the coil pattern at one end of the second component and is formed to one end of the first component so as to penetrate the coil pattern. The current sensor according to claim 1. At least one of the one end part of the first and second constituent parts and the other end part of the first and second constituent parts is made of the same material as the main component constituting the first and second constituent parts. The current sensor according to any one of claims 1 to 4, wherein the current sensor is fixed by a joining member (40).

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