WO2015124975A1 - Electric current measurement coil - Google Patents

Electric current measurement coil Download PDF

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Publication number
WO2015124975A1
WO2015124975A1 PCT/IB2015/000082 IB2015000082W WO2015124975A1 WO 2015124975 A1 WO2015124975 A1 WO 2015124975A1 IB 2015000082 W IB2015000082 W IB 2015000082W WO 2015124975 A1 WO2015124975 A1 WO 2015124975A1
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WIPO (PCT)
Prior art keywords
coil
conductive
conductive layers
layers
conductive pattern
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PCT/IB2015/000082
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French (fr)
Japanese (ja)
Inventor
吉田　博
淳平 遠藤
雄介 宮村
明実 塩川
Original Assignee
パナソニックＩｐマネジメント株式会社
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Publication of WO2015124975A1 publication Critical patent/WO2015124975A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/003—Printed circuit coils

Definitions

  • the present invention relates to a current measuring coil used as a current detection sensor in a distribution board or the like, and more particularly to a Rogowski coil type current measuring coil.
  • Rogowski coils are used as current detection sensors in distribution boards, etc., but energy saving is progressing in electrical equipment such as LED bulbs, and high sensitivity is required so that less current can be detected. ing.
  • the Rogowski coil is coreless, it has the merits that it does not saturate magnetically and there is no heat generation or hysteresis error due to magnetic loss, but it has the demerit that the output voltage is low and the S / N decreases due to the influence of an external magnetic field. Have.
  • FIG. 10 shows the structure of a general CT (current transformer) in which a toroidal coil is wound around a toroidal core made of a magnetic material, and (b) shows the structure of a coreless Rogowski coil.
  • C shows an area surrounded by a general CT with respect to an external magnetic field in a direction perpendicular to the paper surface
  • D shows an area surrounded by the Rogowski coil with respect to an external magnetic field in a direction perpendicular to the paper surface.
  • the Rogowski coil is coreless, the output S due to the magnetic field to be measured is small and is easily affected by the external magnetic field, so that a decrease in S / N becomes a problem. Therefore, as shown in FIG. 10 (b), the conductor is spirally wound, and after making a round in the toroidal direction, the central portion of the toroidal coil is rewound by one turn in the opposite direction. Therefore, as shown in FIG. 10 (d), for an external magnetic field perpendicular to the toroidal direction, the cross section perpendicular to the toroidal direction of the toroidal coil in the winding advance direction is rewound for one turn in the unwinding direction. The area of the region (right oblique hatching) that is offset by the cross section of the coil and affected by the external magnetic field is small.
  • FIG. 11 and 12 show a conventional Rogowski coil 201 described in Patent Document 1.
  • FIG. 11 shows a conductive pattern and a through hole seen through in the stacking direction of the circuit board.
  • FIG. The perspective view of a partial structure of a through hole is shown.
  • a toroidal coil is continuously formed in double in the winding direction and the unwinding direction, and 1 in the winding coil as seen from the direction perpendicular to the circuit board 202 (direction in which the current to be measured flows).
  • the conductive pattern is formed so that the area of the region S1 for the turn and the area of the region S2 for one turn of the rewinding coil are substantially equal.
  • On the inner circumference side at regular intervals on the same circumference along a circular opening 203 that penetrates the conductor through which the current to be measured flows. .. and 231, 232... are formed.
  • a conductive pattern 251 is formed which extends radially from the through hole 211 constituting the winding coil toward the outer periphery and is bent to the right near the outer periphery.
  • a through hole 221 is formed at the tip of the conductive pattern 251 that is bent to the right.
  • the second through hole 212 on the right next to the through hole 211 extends radially toward the outer periphery and turns to the left near the outer periphery (turns to the right when viewed from the back side).
  • a conductive pattern 252 is formed, and is further connected to the through hole 221.
  • the conductive pattern 251 on the front surface, the through hole 221, the conductive pattern 252 on the back surface, and the through hole 212 are wound to form one turn of the coil.
  • Such conductive patterns and through holes are formed on the annular circuit board 202 so as to make a round in the toroidal direction, thereby forming a winding advance coil.
  • a conductive pattern 261 extending linearly in the radial direction toward the outer peripheral portion is formed from the through hole 231 constituting the rewinding coil, and the through hole 241 is provided at the tip of the conductive pattern 261. Is formed.
  • the through hole 241 is formed on the inner concentric circle of the two concentric circles on the outer peripheral portion of the circuit base 202.
  • a short conductive pattern is bent leftward from the through hole 241 toward the outer concentric circle on the outer periphery of the circuit board 202 (turned to the right when viewed from the back side). 262 is formed and connected to a through hole 242 formed on the outer concentric circumference.
  • a short conductive pattern 263 is formed from the through hole 242 to the left concentric circle on the inner concentric circle of the two concentric circles on the outer periphery of the circuit board 202, and formed on the inner concentric circumference. Connected to the through hole 243.
  • a conductive pattern 264 extending linearly in the radial direction from the through hole 243 toward the inner periphery is formed and connected to the through hole 232.
  • one turn of the rewinding coil is formed by the conductive pattern 261 on the front surface, the through hole 241, the conductive pattern 262 on the back surface, the through hole 242, the conductive pattern 263 on the front surface, the through hole 243, the conductive pattern 264 on the back surface, and the through hole 232.
  • Such conductive patterns and through holes are formed on the annular circuit board 202 so as to make a round in the toroidal direction, thereby forming a rewinding coil.
  • the circuit board 202 has only two conductive layers on which conductive patterns are formed, and the conductive pattern is formed on the back surface of the portion where the conductive pattern is formed on the front surface. Not the other way around, and vice versa. Therefore, the number of conductive patterns cannot be increased, and as a result, there is a limit to increasing the number of turns of the toroidal coil. Further, since the conductive pattern of the rewinding coil winds up and overcomes the conductive pattern of the coil, three through holes are required, so the number of through holes in the outer peripheral portion of the annular circuit board 202 is increased and the yield is reduced. It is the cause.
  • the winding direction of the coil over the conductive pattern of the winding advance coil is reversed with respect to the original magnetic field to be measured.
  • the magnetic field to be measured indicated by the arrow X one turn of the coil formed by the conductive pattern 264, the through hole 232, the conductive pattern 261, and the through hole 241, the through hole 241, the conductive pattern 262, and the through The winding direction of one turn of the coil formed by the hole 242, the conductive pattern 263, and the through hole 243 is reversed.
  • the cross-sectional area of the reverse winding portion acts in the direction of canceling the current flowing through the rewinding coil as a signal, which is one of the causes of the S / N reduction.
  • the present invention has been made in order to solve the above-described problems of the conventional example.
  • the circuit having the same size as that of the conventional circuit is offset while the influence of the winding coil from the external magnetic field is offset by the influence of the winding coil from the external magnetic field.
  • a current measuring coil that can increase the number of turns of a toroidal coil by using a substrate and further reduce the number of through holes to improve the yield.
  • a current measuring coil includes a circuit board having a plurality of conductive layers and a plurality of insulating layers alternately stacked, and an opening for passing through a conductor through which a current to be measured flows.
  • a coil for current measurement formed so as to surround the first coil including two or more conductive patterns formed in two or more conductive layers of the plurality of conductive layers;
  • a second coil including one or more conductive patterns formed in one or more other conductive layers, and the first coil and the second coil when viewed from the stacking direction of the plurality of conductive layers.
  • the coil is wound in opposite directions, and is affected by a magnetic field parallel to the stacking direction of the plurality of conductive layers.
  • the area surrounded by the first coil and the area surrounded by the second coil are substantially equal.
  • the conductive pattern of the first coil and the second coil, when viewed from the laminate direction of said plurality of conductive layers is that overlap.
  • the conductive patterns of the first coil that overlap each other, the conductive patterns of the second coil that overlap each other, and the conductive patterns of the first coil are preferably configured so that currents flow in opposite directions.
  • the current measuring coil includes a plurality of first through holes that electrically connect the conductive patterns of the first coil, and a plurality of second through holes that electrically connect the conductive patterns of the second coil.
  • the conductive pattern of the first coil and the conductive pattern of the second coil are respectively formed in different conductive layers of the plurality of conductive layers, and the first coil includes the two conductive layers.
  • the current measuring coil further includes a plurality of first through holes that electrically connect the conductive pattern of the first coil, and the conductive pattern of the first coil includes two of the plurality of conductive layers.
  • the conductive pattern of the second coil is formed on another conductive layer of the plurality of conductive layers, and the first coil is formed on two conductive layers of the plurality of conductive layers.
  • a toroidal coil formed by the first through hole that electrically connects the conductive pattern of the formed first coil and the conductive pattern of the first coil, and the second coil is the other of the plurality of conductive layers It is preferable that the planar coil is formed in one conductive layer and formed so as to make a round around the opening.
  • the plurality of first and second through holes are formed in the stacking direction of the plurality of conductive layers, and are spaced apart from each other on two concentric circles having different diameters on the inner peripheral side relatively close to the opening.
  • a plurality of inner peripheral through holes formed so as to be shifted from each other in a radial direction, and a plurality of outer peripheral through holes formed at predetermined intervals on a single concentric circle on the outer peripheral side relatively far from the opening. It is preferable to include.
  • the number of the plurality of conductive layers is four, the number of the plurality of insulating layers is three, and the first and second through holes penetrate all the four conductive layers and the three insulating layers. It is preferable to be formed as described above.
  • the thickness of the central insulating layer may be larger than the thickness of the other two insulating layers.
  • the coil for current measurement further includes a first lead wire portion connected to a start point portion of the first coil and a second lead wire portion connected to an end point portion of the second coil, and the first lead wire portion
  • the line part and the second lead line part may be formed in a pattern in which currents flow in opposite directions.
  • first lead line portion and the second lead line portion are formed in different conductive layers among the plurality of conductive layers.
  • the area surrounded by the winding advance coil and the area surrounded by the rewinding coil are substantially equal to the magnetic field parallel to the stacking direction of the conductive layer.
  • the effect of the rewinding coil from an external magnetic field cancels out, and a decrease in S / N due to a magnetic field parallel to the stacking direction of the conductive layers can be prevented.
  • winding directions of the winding advance coil and the rewinding coil are opposite to each other, and a plurality of conductive patterns that respectively form the winding advance coil and the rewinding coil are seen through from a direction parallel to the lamination direction of the conductive layers, Since they overlap, the influence of external magnetic fields caused by the flow of currents in the opposite directions can be offset against the magnetic field perpendicular to the direction of stacking of the conductive layers. S / N can be prevented from decreasing due to a strong magnetic field.
  • the conductive patterns forming the winding advance coil and the rewinding coil are seen through from the direction parallel to the stacking direction of the conductive layers, the conductive patterns are overlapped on the back surface of the portion where the conductive pattern on the surface is formed. Compared to a conventional example in which a pattern is not formed (and vice versa), the number of turns of a toroidal coil can be increased even if a circuit board having the same size is used. Further, since the conductive pattern of the winding advance coil and the conductive pattern of the rewinding coil are formed in different conductive layers, an extra through hole is provided to overcome the conductive pattern of the winding advance coil and the conductive pattern of the rewinding coil. This is not necessary, and the total number of through holes in the circuit board does not increase, and it is possible to prevent a decrease in yield.
  • FIG. 1 is a front view showing a circuit board on which a Rogowski coil according to a first embodiment of the present invention is formed.
  • the front view which shows the 1st conductive pattern formed in the 1st conductive layer of the circuit board in 1st Embodiment.
  • the front view which shows the 2nd conductive pattern formed in the 2nd conductive layer of the circuit board in 1st Embodiment.
  • the front view which shows the 3rd conductive pattern formed in the 3rd conductive layer of the circuit board in 1st Embodiment.
  • FIG. 1 shows a circuit board on which a Rogowski coil 1 according to the first embodiment is formed.
  • the conductive patterns of the first conductive layer (solid line) and the second conductive layer (broken line) are shown for easy understanding.
  • 2 to 5 show the conductive patterns of the first to fourth conductive layers, respectively.
  • the Rogowski coil 1 has a winding coil (first coil) and a winding coil (second coil) whose winding directions are opposite to each other, and has four conductive layers (10 to 40) and 3
  • the circuit board 2 is formed by alternately laminating two insulating layers. As shown in FIG. 1, a circular opening 3 for penetrating a conductor through which a current to be measured passes is formed at the center of the circuit board 2, and the winding advance coil and the rewinding coil surround the opening 3. Is formed.
  • the through holes 6 x, 61, 62 are shifted from each other in a radial direction at predetermined intervals on the circumferences of two concentric circles C 1 and C 2 having different diameters. ... and 8x, 81, 82 ... are formed. Further, on the outer peripheral side far from the opening 3, through holes 51, 52..., 71, 72... Are formed at predetermined intervals on the circumference of the concentric circle C3. Each through hole is formed so as to penetrate through four conductive layers and three insulating layers.
  • the winding advance coil and the rewinding coil are each formed as a toroidal coil.
  • the winding coil mainly includes second conductive patterns 21x and 21 of the second conductive layer 20, fourth conductive patterns 41x and 41 of the fourth conductive layer 40, and through holes 51 formed on the circumference of the concentric circle C3. 52, and through holes 6x, 61, 62, etc. formed on the circumference of the concentric circle C1.
  • the rewinding coil mainly includes the first conductive patterns 11x and 11 of the first conductive layer 10, the third conductive patterns 31x and 31 of the third conductive layer 30, and the outer through holes 71, 72,. , Etc., are formed by through holes 8x, 81, 82,... Formed on the circumference of the concentric circle C2.
  • the first lead wire portion 4 for taking out the signal is connected to the through hole 51 of the first conductive layer which is the starting point portion of the winding coil shown in FIG.
  • the through hole 51 is connected to the conductive pattern formed in the fourth conductive layer 40 shown in FIG. 5, and the conductive pattern 41 of the fourth conductive layer 40 is connected to the through hole 61.
  • the through hole 61 is connected to the conductive pattern formed in the second conductive layer 20 shown in FIG. 3, and the conductive pattern 21 of the second conductive layer 20 is connected to the through hole 52.
  • the through hole 52 is connected to the through hole 62 by the conductive pattern 41 shown in FIG. Thereafter, such a loop goes around the opening 3 clockwise to form a winding coil.
  • the last through hole 6 x of the winding advance coil is connected to a linear conductive pattern 11 x formed in the first conductive layer 10 shown in FIG. 2, and the conductive pattern 11 x is connected to the through hole 71.
  • the through hole 71 is connected to the through hole 81 by the conductive pattern 31 formed in the third conductive layer 30 shown in FIG.
  • the through hole 81 is connected to the conductive pattern formed in the first conductive layer 10 shown in FIG. 2 and is connected to the through hole 72 by the conductive pattern 11 of the first conductive layer 10.
  • the through hole 72 is connected to the through hole 82 by the conductive pattern 31 shown in FIG. Thereafter, such a loop is made around the opening 3 counterclockwise to form a rewinding coil.
  • the last through-hole 8x of the rewinding coil is connected to the linear conductive pattern 2x of the second conductive layer 20 shown in FIG. 3, and the conductive pattern 2x which is the end point of the rewinding coil is a second for extracting a signal.
  • the lead wire part 5 is connected.
  • the first lead line portion 4 and the second lead line portion 5 are formed in the first conductive layer 10 and the second conductive layer 20, respectively.
  • the conductive pattern of the first conductive layer 10 and the conductive pattern of the second conductive layer 20 are electrically connected via each other.
  • currents flow in opposite directions and are seen through from the stacking direction of the conductive layer 2 (hereinafter abbreviated as a plan view). It is formed in an X-shaped intersection pattern (see FIG. 1) that partially overlaps.
  • the outer radial portions 11a of the respective conductive patterns 11x, 11 ... of the first conductive layer 10 shown in FIG. 2 and the radial portions of the outer conductive patterns 31x, 31 ... of the third conductive layer 30 shown in FIG. 31a overlaps each other in a plan view. Further, the radial portions 21a outside the respective conductive patterns 21x, 21... Of the second conductive layer 20 shown in FIG. 3 and the outer sides of the respective conductive patterns 41x, 41. The radial portions 41a overlap each other in plan view. On the other hand, each of the outer radial portions 11a and 31a of the conductive patterns 11x, 11...
  • the outer radial portions 21a and 41a of the conductive patterns 21x, 21 ..., 41x, 41 ... do not overlap with each other in plan view and are adjacent to each other.
  • a circumferential portion 11b of each conductive pattern 11 ... of the first conductive layer 10 shown in FIG. 2 and a circumferential portion of each conductive pattern 21 ... of the second conductive layer 20 shown in FIG. 21b overlaps each other in plan view.
  • a circumferential portion 31b of each conductive pattern 31 of the third conductive layer 30 shown in FIG. 4 and a circumferential direction of each conductive pattern 41 of the fourth conductive layer 40 shown in FIG. The portions 41b overlap each other in plan view.
  • the circuit board 2 has four conductive layers on which conductive patterns are formed, and the conductive patterns forming the winding advance coil and the rewinding coil overlap each other as seen through from the stacking direction of the conductive layers. Therefore, compared to the conventional example shown in FIG. 11, the total number of turns of the Rogowski coil 1 can be increased, the voltage of the output signal can be increased, and the S / N can be increased. In addition, since the conductive pattern of the winding advance coil and the conductive pattern of the rewinding coil are formed in different conductive layers, an extra through hole is provided to overcome the conductive pattern of the winding advance coil and the conductive pattern of the rewinding coil.
  • the S / N can be further increased.
  • the area surrounded by one turn in the poloidal direction of the toroidal coil is affected by the external magnetic field orthogonal to the stacking direction of the conductive layers.
  • the Rogowski coil 1 is formed on the circuit board 2 in which a plurality of conductive layers and a plurality of insulating layers are laminated, and as described above, the conductive patterns of overlapping winding coils overlap each other.
  • the conductive patterns of the rewinding coil, and the overlapping conductive patterns of the rewinding coil and the rewinding coil are arranged so that current flows in opposite directions.
  • an external magnetic field generated by a current other than the current to be measured has a greater influence as it is closer to the current, and therefore, it is preferable to cancel the currents flowing in the conductive pattern formed in the closer conductive layer.
  • the conductive pattern constituting the first lead-out line portion 4 and the conductive pattern constituting the second lead-out line portion 5 are such that currents flow in opposite directions. , Partially intersecting, and formed in an intersecting pattern that is X-shaped in plan view. Therefore, the current flowing through the first lead line portion 4 and the current flowing through the second lead line portion 5 cancel each other against the influence of the external magnetic field, so the first lead line portion 4 and the second lead line portion 5 It is possible to prevent the S / N from being lowered.
  • the Rogowski coil 1a according to the second embodiment is also formed on the circuit board 2 formed by alternately stacking four conductive layers and three insulating layers, and in the case of the first embodiment shown in FIG. Similarly, a circular opening for passing a conductor through which a current to be measured flows is formed in the center of the circuit board 2 (not shown).
  • 6 to 9 show the conductive patterns of the first to fourth conductive layers 110, 120, 130, and 140 of the circuit board 2 in the second embodiment, respectively.
  • the inner through hole 16x on the inner peripheral side so as to be displaced in a radial direction at regular intervals on the circumference of the two concentric circles C1 and C2. , 161... are formed.
  • through holes 151 On the outer peripheral side are formed at predetermined intervals on the circumference of the single circumference C3. Further, each through hole is formed so as to penetrate through the four conductive layers and the three insulating layers.
  • the winding advance coil includes a winding advance conductive pattern formed on the first conductive layer 110 and the fourth conductive layer 140 forming the circuit board 2 and a winding advance conductive pattern formed on these two conductive layers.
  • the rewinding coil is formed on the second conductive layer 120 that forms the circuit board 2, and is a plane that is formed so as to substantially go around the opening. It is a coil.
  • the third conductive layer 130 is formed with only conductive patterns constituting the first lead line portion 4 and the second lead line portion 5 for taking out signals.
  • the fourth conductive layer 140 is also formed with conductive patterns of other portions constituting the first lead line portion 4 and the second lead line portion 5.
  • the first lead line portion 4 and the second lead line portion 5 are connected to the conductive pattern of the third conductive layer 130 and the conductive property of the fourth conductive layer 140 through the through hole 6. It is electrically connected to the pattern.
  • the conductive pattern constituting the first lead line portion 4 and the conductive pattern constituting the second lead line portion 5 are partially in plan view so that currents flow in opposite directions. Overlapping X-shaped intersection patterns are formed.
  • the conductive patterns 111... Having substantially the same shape are connected.
  • the first lead line portion 4 is connected to the through hole 151 of the third conductive layer 130, and the through hole 151 is connected to the first conductive pattern 110 shown in FIG.
  • the conductive pattern 111 of the pattern 110 is connected to the through hole 161.
  • the through hole 161 is connected to the conductive pattern of the fourth conductive layer 140 shown in FIG.
  • the last through hole 15x of the winding coil is connected to a linear conductive pattern 121 formed in the radial direction in the second conductive layer 120 shown in FIG.
  • the conductive pattern 121 is connected to an annular conductive pattern 122 that makes a round in the counterclockwise direction so as to surround the inner through-holes 161.
  • the end of the ring-shaped conductive pattern 122 is connected to the through hole 16x, and as shown in FIG. 9, is connected to the linear conductive pattern 14x formed in the fourth conductive layer 140.
  • the conductive pattern 14x takes out a signal. Are connected to the second lead wire portion 5.
  • the portion corresponding to the circumferential portion in the first embodiment is not a circumferential direction, but a circumferential direction. It is formed obliquely so as to form a predetermined angle with respect to the direction.
  • An annular conductive pattern 122 is formed in a sawtooth shape so as to overlap the circumferential portion formed obliquely.
  • the toroidal coil has the conductive pattern of the first conductive layer 110 and the conductive pattern of the fourth conductive layer 140, and the through holes 151. It is formed with. Therefore, the cross-sectional area in the poloidal direction of the toroidal coil for detecting the original current to be measured is increased, and the output voltage can be increased.
  • this invention is not limited to description of the said embodiment, A various deformation
  • the thickness of the central insulating layer may be larger than the thickness of the other two insulating layers.
  • the cross-sectional area of the toroidal coil in the poloidal direction can be increased, the output voltage can be further increased, and the S / N can be further improved.
  • the number of turns of the coil can be increased by using the built-up substrate. Thereby, the output voltage can be further increased, and the S / N can be further improved.

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Abstract

This electrical current measurement coil is formed upon a circuit board that has a plurality of conductive layers and insulating layers, which are stacked in an alternating manner, and an opening, which is traversed by a conductor carrying the electric current to be measured, in a manner such that the electric current measurement coil surrounds the opening. The electric current measuring coil has a first coil, which includes two or more conductive patterns formed on two or more conductive layers among the plurality of conductive layers, and a second coil including one or more conductive patterns formed on one or more conductive layers different therefrom among the plurality of conductive layers. When viewed from the stacking direction of the plurality of conductive layers, the winding directions of the first coil and the second coil are reversed, and the area of the region surrounded by the first coil and the area of the region surrounded by the second coil, said regions being affected by magnetic fields that are parallel to the stacking direction of the plurality of conductive layers, are substantially the same, and the plurality of conductive patterns formed on the plurality of conductive layers overlap in the stacking direction of the plurality of conductive layers.

Description

電流測定用コイルCurrent measurement coil
　本発明は、分電盤などにおいて電流検出センサとして用いられる電流測定コイル、特にロゴスキーコイル型電流測定用コイルに関する。 The present invention relates to a current measuring coil used as a current detection sensor in a distribution board or the like, and more particularly to a Rogowski coil type current measuring coil.
　ロゴスキーコイルは、分電盤などにおいて電流検出センサとして用いられているが、ＬＥＤ電球をはじめとして電気機器の省エネ化が進んでおり、より少ない電流を検出できるように、高感度化が求められている。ところで、ロゴスキーコイルはコアレスであるため、磁気飽和せず、磁気損失による発熱やヒステリシス誤差がないといったメリットを有する反面、出力電圧が低く、外部磁界の影響によりＳ／Ｎが低下するというデメリットを有している。 Rogowski coils are used as current detection sensors in distribution boards, etc., but energy saving is progressing in electrical equipment such as LED bulbs, and high sensitivity is required so that less current can be detected. ing. By the way, since the Rogowski coil is coreless, it has the merits that it does not saturate magnetically and there is no heat generation or hysteresis error due to magnetic loss, but it has the demerit that the output voltage is low and the S / N decreases due to the influence of an external magnetic field. Have.
　外部磁界による影響について、図１０を参照しつつ説明する。図１０において、（ａ）は参考として磁性体によるトロイダルコアの周囲にトロイダルコイルを巻回した一般的なＣＴ（変流器）の構成を示し、（ｂ）はコアレスのロゴスキーコイルの構成を示す。また、（ｃ）は紙面に垂直な方向の外部磁界に対して一般的なＣＴが囲む面積を示し、（ｄ）は紙面に垂直な方向の外部磁界に対してロゴスキーコイルが囲む面積を示す。 The influence of the external magnetic field will be described with reference to FIG. In FIG. 10, (a) shows the structure of a general CT (current transformer) in which a toroidal coil is wound around a toroidal core made of a magnetic material, and (b) shows the structure of a coreless Rogowski coil. Show. (C) shows an area surrounded by a general CT with respect to an external magnetic field in a direction perpendicular to the paper surface, and (d) shows an area surrounded by the Rogowski coil with respect to an external magnetic field in a direction perpendicular to the paper surface. .
　図１０（ａ）に示すように、一般的なＣＴは、トロイダルコアの周囲に導体を螺旋状に巻き進め、トロイダル方向に一周して巻き終わるため、そのトロイダル方向に垂直な方向（すなわち、紙面に垂直な方向）の磁界に対しては、１ターンのコイルと等価である。そのため、図１０（ｃ）に示すように、トロイダル方向に垂直な方向の外部磁界に対しては、トロイダルコイルのトロイダル方向に垂直な断面がそのまま外部磁界の影響を受ける領域（左斜めハッチング）となる。ところが、一般的なＣＴは磁性体のコアを有しているので、トロイダルコアの内部を通る被測定磁界による出力Ｓが外部磁界によるノイズＮよりも遙かに大きいため、外部磁界による影響はあまり問題にはならない。ところが、ロゴスキーコイルはコアレスであるので、被測定磁界による出力Ｓが小さく、外部磁界による影響を受けやすく、Ｓ／Ｎの低下が問題となる。そこで、図１０（ｂ）に示すように、導体を螺旋状に巻き進め、トロイダル方向に一周したあと、トロイダルコイルの中心部を逆方向に１ターン分巻き戻している。そのため、図１０（ｄ）に示すように、トロイダル方向に垂直な方向の外部磁界に対しては、巻き進み方向におけるトロイダルコイルのトロイダル方向に垂直な断面が巻き戻し方向における１ターン分の巻き戻しコイルの断面によって相殺され、外部磁界の影響を受ける領域（右斜めハッチング）の面積が小さくなっている。 As shown in FIG. 10 (a), in general CT, a conductor is spirally wound around a toroidal core and wound around the toroidal direction to finish winding. Therefore, a direction perpendicular to the toroidal direction (that is, paper surface) Is equivalent to a one-turn coil. Therefore, as shown in FIG. 10C, for the external magnetic field in the direction perpendicular to the toroidal direction, the cross section perpendicular to the toroidal direction of the toroidal coil is directly affected by the external magnetic field (left oblique hatching). Become. However, since a general CT has a magnetic core, the output S due to the magnetic field to be measured passing through the inside of the toroidal core is much larger than the noise N due to the external magnetic field. It doesn't matter. However, since the Rogowski coil is coreless, the output S due to the magnetic field to be measured is small and is easily affected by the external magnetic field, so that a decrease in S / N becomes a problem. Therefore, as shown in FIG. 10 (b), the conductor is spirally wound, and after making a round in the toroidal direction, the central portion of the toroidal coil is rewound by one turn in the opposite direction. Therefore, as shown in FIG. 10 (d), for an external magnetic field perpendicular to the toroidal direction, the cross section perpendicular to the toroidal direction of the toroidal coil in the winding advance direction is rewound for one turn in the unwinding direction. The area of the region (right oblique hatching) that is offset by the cross section of the coil and affected by the external magnetic field is small.
　ロゴスキーコイルのＳ／Ｎを高くする手法として、トロイダルコイルの巻数を多くすることが考えられる。ところが、例えば特許文献１に記載されたような回路基板の両面の導電パターンとスルーホール（ビアホール）でコイルを構成するタイプのロゴスキーコイルでは、加工可能なスルーホールの直径やランドの外径などの制約により、コイルの巻数が制限される。そこで、特許文献１に記載されたロゴスキーコイルでは、外部磁界の影響をキャンセルするように、回路基板表面に形成される導電パターンにさらに工夫が施されている。 It is conceivable to increase the number of turns of the toroidal coil as a technique for increasing the S / N of the Rogowski coil. However, for example, a Rogowski coil of a type that forms a coil with conductive patterns and through holes (via holes) on both sides of a circuit board as described in Patent Document 1, the diameter of a processable through hole, the outer diameter of a land, and the like Due to this limitation, the number of turns of the coil is limited. Therefore, the Rogowski coil described in Patent Document 1 is further devised in the conductive pattern formed on the circuit board surface so as to cancel the influence of the external magnetic field.
　図１１及び１２は特許文献１に記載された従来のロゴスキーコイル２０１を示すものであって、図１１は回路基板の積層方向に透視した導電パターン及びスルーホールを示し、図１２は導電パターンとスルーホールの一部構成の斜視図を示す。 11 and 12 show a conventional Rogowski coil 201 described in Patent Document 1. FIG. 11 shows a conductive pattern and a through hole seen through in the stacking direction of the circuit board. FIG. The perspective view of a partial structure of a through hole is shown.
　このロゴスキーコイル２０１では、トロイダルコイルを巻き進み方向と巻き戻し方向に連続して二重形成し、回路基板２０２に垂直な方向（被測定電流の流れる方向）から見て、巻き進みコイルの１ターン分の領域Ｓ１の面積と巻き戻しコイルの１ターン分の領域Ｓ２の面積がほぼ等しくなるように導電パターンを形成している。その結果、巻き進みコイルが外部磁界から受ける影響を巻き戻しコイルが外部磁界から受ける影響で相殺し、ノイズ成分をより少なくしてＳ／Ｎをさらに高くしている。 In this Rogowski coil 201, a toroidal coil is continuously formed in double in the winding direction and the unwinding direction, and 1 in the winding coil as seen from the direction perpendicular to the circuit board 202 (direction in which the current to be measured flows). The conductive pattern is formed so that the area of the region S1 for the turn and the area of the region S2 for one turn of the rewinding coil are substantially equal. As a result, the influence of the winding coil from the external magnetic field is offset by the influence of the unwinding coil from the external magnetic field, and the S / N is further increased by reducing the noise component.
　より具体的には、環状の回路基板２０２には、被測定電流が流れる導体を貫通させる円形の開口２０３に沿って、同一円周上に一定間隔で内周側のスルーホール２１１、２１２・・・及び２３１、２３２・・・が形成されている。また、回路基板２０２の外周部には、２つの同心円周上に所定のパターンで外周側のスルーホール２２１・・・及び２４１・・・が形成されている。回路基板２０２の表面において、巻き進みコイルを構成するスルーホール２１１からは、外周部に向かって放射状に延び、外周部近傍で右に曲がっている導電パターン２５１が形成されている。右に曲がっている導電パターン２５１の先にはスルーホール２２１が形成されている。回路基板２０２の裏面において、スルーホール２１１の二番目の右隣のスルーホール２１２からは、外周部に向かって放射状に延び、外周部近傍で左に曲がっている（裏側から見れば右に曲がっている）導電パターン２５２が形成され、さらに上記スルーホール２２１に接続されている。このように、表面の導電パターン２５１、スルーホール２２１、裏面の導電パターン２５２及びスルーホール２１２で巻き進みコイルの１ターンが形成される。このような導電パターン及びスルーホールが環状の回路基板２０２上にトロイダル方向に一周するように形成され、巻き進みコイルを形成している。 More specifically, on the annular circuit board 202, through holes 211, 212,... On the inner circumference side at regular intervals on the same circumference along a circular opening 203 that penetrates the conductor through which the current to be measured flows. .. and 231, 232... Are formed. Further, on the outer peripheral portion of the circuit board 202, through holes 221... 241... 241. On the surface of the circuit board 202, a conductive pattern 251 is formed which extends radially from the through hole 211 constituting the winding coil toward the outer periphery and is bent to the right near the outer periphery. A through hole 221 is formed at the tip of the conductive pattern 251 that is bent to the right. On the back surface of the circuit board 202, the second through hole 212 on the right next to the through hole 211 extends radially toward the outer periphery and turns to the left near the outer periphery (turns to the right when viewed from the back side). A conductive pattern 252 is formed, and is further connected to the through hole 221. In this way, the conductive pattern 251 on the front surface, the through hole 221, the conductive pattern 252 on the back surface, and the through hole 212 are wound to form one turn of the coil. Such conductive patterns and through holes are formed on the annular circuit board 202 so as to make a round in the toroidal direction, thereby forming a winding advance coil.
　回路基板２０２の表面において、巻き戻しコイルを構成するスルーホール２３１からは、外周部に向かって放射方向に、直線状に延びた導電パターン２６１が形成され、導電パターン２６１の先にはスルーホール２４１が形成されている。このスルーホール２４１は、回路基２０２の外周部の２つの同心円のうち内側の同心円周上に形成されている。回路基板２０２の裏面において、スルーホール２４１からは、回路基板２０２の外周部の２つの同心円のうち外側の同心円に向かって左に曲がっている（裏側から見れば右に曲がっている）短い導電パターン２６２が形成され、外側の同心円周上に形成されたスルーホール２４２に接続されている。回路基板２０２の表面において、スルーホール２４２からは、回路基板２０２の外周部の２つの同心円のうち内側の同心円に向かって左ドッグレッグした短い導電パターン２６３が形成され、内側の同心円周上に形成されたスルーホール２４３に接続されている。回路基板２０２の裏面において、スルーホール２４３からは、内周部に向かって放射方向に、直線状に延びた導電パターン２６４が形成され、スルーホール２３２に接続されている。このように、表面の導電パターン２６１、スルーホール２４１、裏面の導電パターン２６２、スルーホール２４２、表面の導電パターン２６３、スルーホール２４３、裏面の導電パターン２６４及びスルーホール２３２で巻き戻しコイルの１ターンが形成される。このような導電パターン及びスルーホールが環状の回路基板２０２上にトロイダル方向に一周するように形成され、巻き戻しコイルを形成している。 On the surface of the circuit board 202, a conductive pattern 261 extending linearly in the radial direction toward the outer peripheral portion is formed from the through hole 231 constituting the rewinding coil, and the through hole 241 is provided at the tip of the conductive pattern 261. Is formed. The through hole 241 is formed on the inner concentric circle of the two concentric circles on the outer peripheral portion of the circuit base 202. On the back surface of the circuit board 202, a short conductive pattern is bent leftward from the through hole 241 toward the outer concentric circle on the outer periphery of the circuit board 202 (turned to the right when viewed from the back side). 262 is formed and connected to a through hole 242 formed on the outer concentric circumference. On the surface of the circuit board 202, a short conductive pattern 263 is formed from the through hole 242 to the left concentric circle on the inner concentric circle of the two concentric circles on the outer periphery of the circuit board 202, and formed on the inner concentric circumference. Connected to the through hole 243. On the back surface of the circuit board 202, a conductive pattern 264 extending linearly in the radial direction from the through hole 243 toward the inner periphery is formed and connected to the through hole 232. Thus, one turn of the rewinding coil is formed by the conductive pattern 261 on the front surface, the through hole 241, the conductive pattern 262 on the back surface, the through hole 242, the conductive pattern 263 on the front surface, the through hole 243, the conductive pattern 264 on the back surface, and the through hole 232. Is formed. Such conductive patterns and through holes are formed on the annular circuit board 202 so as to make a round in the toroidal direction, thereby forming a rewinding coil.
　図１１及び図１２から明らかなように、この回路基板２０２は導電パターンが形成される導電層が２層しかなく、表面の導電パターンが形成されている部分の裏面には導電パターンが形成されておらず、その逆も同様である。そのため、導電パターンの本数を多くすることはできず、結果的にトロイダルコイルの巻数を多くするには限界がある。また、巻き戻しコイルの導電パターンが巻き進みコイルの導電パターンを乗り越えるために、３つのスルーホールを必要とするため、環状の回路基板２０２の外周部のスルーホール数が多くなり、歩留まりを低下させる原因となっている。 As is apparent from FIGS. 11 and 12, the circuit board 202 has only two conductive layers on which conductive patterns are formed, and the conductive pattern is formed on the back surface of the portion where the conductive pattern is formed on the front surface. Not the other way around, and vice versa. Therefore, the number of conductive patterns cannot be increased, and as a result, there is a limit to increasing the number of turns of the toroidal coil. Further, since the conductive pattern of the rewinding coil winds up and overcomes the conductive pattern of the coil, three through holes are required, so the number of through holes in the outer peripheral portion of the annular circuit board 202 is increased and the yield is reduced. It is the cause.
　さらに、図１２に示すように、巻き戻しコイルに関して、巻き進みコイルの導電パターンを乗り越える部分のコイルの巻き方向が本来の被測定磁界に対して逆巻きになっている。具体的には、矢印Ｘで示す被測定磁界に対して、導電パターン２６４、スルーホール２３２、導電パターン２６１及びスルーホール２４１で形成されるコイルの１ターンと、スルーホール２４１、導電パターン２６２、スルーホール２４２、導電パターン２６３及びスルーホール２４３で形成されるコイルの１ターンの巻き方向が逆になっている。そのため、この逆巻き部分の断面積は、信号である巻き戻しコイルに流れる電流を打ち消す方向に作用するため、Ｓ／Ｎ低下の原因の１つとなっている。 Furthermore, as shown in FIG. 12, with respect to the rewinding coil, the winding direction of the coil over the conductive pattern of the winding advance coil is reversed with respect to the original magnetic field to be measured. Specifically, for the magnetic field to be measured indicated by the arrow X, one turn of the coil formed by the conductive pattern 264, the through hole 232, the conductive pattern 261, and the through hole 241, the through hole 241, the conductive pattern 262, and the through The winding direction of one turn of the coil formed by the hole 242, the conductive pattern 263, and the through hole 243 is reversed. For this reason, the cross-sectional area of the reverse winding portion acts in the direction of canceling the current flowing through the rewinding coil as a signal, which is one of the causes of the S / N reduction.
特開２００７−１５５４２７号公報JP 2007-155427 A
　本発明は、上記従来例の問題を解決するためになされたものであり、巻き進みコイルが外部磁界から受ける影響を巻き戻しコイルが外部磁界から受ける影響で相殺しつつ、従来と同じサイズの回路基板を用いてトロイダルコイルの巻き数の増加を可能とし、さらにスルーホールの数を減少させて歩留まりの向上を可能にする電流測定用コイルを提供する。
課題を解決するための手段 The present invention has been made in order to solve the above-described problems of the conventional example. The circuit having the same size as that of the conventional circuit is offset while the influence of the winding coil from the external magnetic field is offset by the influence of the winding coil from the external magnetic field. Provided is a current measuring coil that can increase the number of turns of a toroidal coil by using a substrate and further reduce the number of through holes to improve the yield.
Means for solving the problem
　本発明の一側面による電流測定用コイルは、交互に積層された複数の導電層及び複数の絶縁層と、被測定電流が流れる導体を貫通させるための開口とを有する回路基板に、前記開口を取り囲むように形成された電流測定用コイルであって、前記複数の導電層のうち２つ以上の導電層に形成される２つ以上の導電パターンを含む第１コイルと、前記複数の導電層のうち他の一つ以上の導電層に形成される一つ以上の導電パターンを含む第２コイルと、を有し、前記複数の導電層の積層方向から見て、前記第１コイルと前記第２コイルは巻き方向が互いに逆になり、前記複数の導電層の積層方向に平行な磁界による影響を受ける、前記第１コイルで囲まれた面積と前記第２コイルで囲まれた面積がほぼ等しく、前記複数の導電層に形成された前記第１コイル及び第２コイルの前記導電パターンが、前記複数の導電層の積層方向から見て、重なり合っていることである。 A current measuring coil according to an aspect of the present invention includes a circuit board having a plurality of conductive layers and a plurality of insulating layers alternately stacked, and an opening for passing through a conductor through which a current to be measured flows. A coil for current measurement formed so as to surround the first coil including two or more conductive patterns formed in two or more conductive layers of the plurality of conductive layers; A second coil including one or more conductive patterns formed in one or more other conductive layers, and the first coil and the second coil when viewed from the stacking direction of the plurality of conductive layers. The coil is wound in opposite directions, and is affected by a magnetic field parallel to the stacking direction of the plurality of conductive layers. The area surrounded by the first coil and the area surrounded by the second coil are substantially equal. Before being formed on the plurality of conductive layers The conductive pattern of the first coil and the second coil, when viewed from the laminate direction of said plurality of conductive layers is that overlap.
　前記複数の導電層の積層方向に直交する磁界によって、互いに重なり合っている前記第１コイルの導電パターン同士、互いに重なり合っている前記第２コイルの導電パターンの同士、及び前記第１コイルの導電パターンと前記第２コイルの導電パターンが、互いに逆方向に電流が流れるようになっていることが好ましい。 Due to the magnetic field orthogonal to the stacking direction of the plurality of conductive layers, the conductive patterns of the first coil that overlap each other, the conductive patterns of the second coil that overlap each other, and the conductive patterns of the first coil The conductive patterns of the second coil are preferably configured so that currents flow in opposite directions.
　前記電流測定用コイルは、前記第１コイルの前記導電パターンを電気的に接続する複数の第１スルーホールと、前記第２コイルの前記導電パターンを電気的に接続する複数の第２スルーホールと、を更に含み、前記第１コイルの前記導電パターンと前記第２コイルの前記導電パターンはそれぞれ前記複数の導電層のうち互いに異なる導電層に形成され、前記第１コイルは、前記２つの導電層に形成された前記第１コイルの導電パターンと前記第１コイルの導電パターンを電気的に接続する前記第１スルーホールで形成されたトロイダルコイルであり、前記第２コイルは、前記他の２つの導電層に形成された第２コイルの導電パターンと前記第２コイルの導電パターンを電気的に接続する前記第２スルーホールで形成されたトロイダルコイルであることが好ましい。 The current measuring coil includes a plurality of first through holes that electrically connect the conductive patterns of the first coil, and a plurality of second through holes that electrically connect the conductive patterns of the second coil. The conductive pattern of the first coil and the conductive pattern of the second coil are respectively formed in different conductive layers of the plurality of conductive layers, and the first coil includes the two conductive layers. A toroidal coil formed by the first through hole that electrically connects the conductive pattern of the first coil and the conductive pattern of the first coil formed on the second coil, and the second coil includes the other two coils A toroidal coil formed by the second through hole that electrically connects the conductive pattern of the second coil formed in the conductive layer and the conductive pattern of the second coil. There it is preferable.
　前記電流測定用コイルは、前記第１コイルの前記導電パターンを電気的に接続する複数の第１スルーホールを更に含み、前記第１コイルの前記導電パターンは、前記複数の導電層のうち２つの導電層に形成され、前記第２コイルの前記導電パターンは前記複数の導電層のうち他の一つの導電層に形成され、前記第１コイルは、前記複数の導電層のうち２つの導電層に形成された第１コイルの導電パターンと第１コイルの導電パターンを電気的に接続する前記第１スルーホールで形成されたトロイダルコイルであり、前記第２コイルは、前記複数の導電層のうち他の１つの導電層に形成され、前記開口の周囲を略一周するように形成された平面コイルであることが好ましい。 The current measuring coil further includes a plurality of first through holes that electrically connect the conductive pattern of the first coil, and the conductive pattern of the first coil includes two of the plurality of conductive layers. The conductive pattern of the second coil is formed on another conductive layer of the plurality of conductive layers, and the first coil is formed on two conductive layers of the plurality of conductive layers. A toroidal coil formed by the first through hole that electrically connects the conductive pattern of the formed first coil and the conductive pattern of the first coil, and the second coil is the other of the plurality of conductive layers It is preferable that the planar coil is formed in one conductive layer and formed so as to make a round around the opening.
　また、前記複数の第１及び第２スルーホールが前記複数の導電層の積層方向に形成され、前記開口に比較的近い内周側において、直径の異なる２つの同心円周上に所定間隔をおいて放射方向視で互いにずれるように形成される複数の内周側スルーホールと、前記開口から比較的遠い外周側において単一の同心円周上に所定間隔で形成されている複数の外周側スルーホールを含むことが好ましい。 The plurality of first and second through holes are formed in the stacking direction of the plurality of conductive layers, and are spaced apart from each other on two concentric circles having different diameters on the inner peripheral side relatively close to the opening. A plurality of inner peripheral through holes formed so as to be shifted from each other in a radial direction, and a plurality of outer peripheral through holes formed at predetermined intervals on a single concentric circle on the outer peripheral side relatively far from the opening. It is preferable to include.
　前記複数の導電層の数は４つであり、前記複数の絶縁層の数は３つであり、前記第１及び第２スルーホールは前記４つの導電層及び前記３つの絶縁層を全て貫通するように形成されていることが好ましい。 The number of the plurality of conductive layers is four, the number of the plurality of insulating layers is three, and the first and second through holes penetrate all the four conductive layers and the three insulating layers. It is preferable to be formed as described above.
　前記３つの絶縁層のうち、中央の絶縁層の厚みは他の２つの絶縁層の厚みよりも厚いものにしても良い。 Of the three insulating layers, the thickness of the central insulating layer may be larger than the thickness of the other two insulating layers.
　前記電流測定用コイルは、前記第１コイルの始点部に接続された第１引き出し線部と、前記第２コイルの終点部に接続された第２引き出し線部とを更に含み、前記第１引き出し線部と前記第２引き出し線部は、互いに電流が逆向きに流れるようなパターンに形成されているものにしても良い。 The coil for current measurement further includes a first lead wire portion connected to a start point portion of the first coil and a second lead wire portion connected to an end point portion of the second coil, and the first lead wire portion The line part and the second lead line part may be formed in a pattern in which currents flow in opposite directions.
　前記第１引き出し線部と前記第２引き出し線部が前記複数の導電層のうち異なる導電層に形成されていることが好ましい。
発明の効果 It is preferable that the first lead line portion and the second lead line portion are formed in different conductive layers among the plurality of conductive layers.
The invention's effect
　本発明によれば、導電層の積層方向に平行な磁界に対して巻き進みコイルで囲まれた面積と巻き戻しコイルで囲まれた面積がほぼ等しいので、巻き進みコイルが外部磁界から受ける影響を巻き戻しコイルが外部磁界から受ける影響で相殺され、導電層の積層方向に平行な磁界によるＳ／Ｎの低下を防止することができる。また、巻き進みコイルと巻き戻しコイルの巻き方向が互いに逆であって、巻き進みコイルと巻き戻しコイルをそれぞれ形成する複数の導電パターンが、導電層の積層方向に平行な方向から透視して、重なり合っているので、導電層の積層方向に垂直な磁界に対しては、互いに重なり合っている部分に逆向きの電流が流れることによって外部磁界から受ける影響を相殺できるので、導電層の積層方向に垂直な磁界によるＳ／Ｎの低下を防止することができる。さらに、巻き進みコイルと巻き戻しコイルを形成する導電パターンが、導電層の積層方向に平行な方向から透視して、重なり合っているので、表面の導電パターンが形成されている部分の裏面には導電パターンが形成されていない（その逆も同様）従来例と比較して、同じサイズの回路基板を用いてもトロイダルコイルの巻き数の増加させることができる。さらに、巻き進みコイルの導電パターンと巻き戻しコイルの導電パターンが、互いに異なる導電層に形成されているため、巻き進みコイルの導電パターンと巻き戻しコイルの導電パターンを乗り越えるために余分なスルーホールを必要とせず、回路基板の全スルーホール数は増加せず、歩留まりの低下を防止することが可能である。 According to the present invention, the area surrounded by the winding advance coil and the area surrounded by the rewinding coil are substantially equal to the magnetic field parallel to the stacking direction of the conductive layer. The effect of the rewinding coil from an external magnetic field cancels out, and a decrease in S / N due to a magnetic field parallel to the stacking direction of the conductive layers can be prevented. Further, the winding directions of the winding advance coil and the rewinding coil are opposite to each other, and a plurality of conductive patterns that respectively form the winding advance coil and the rewinding coil are seen through from a direction parallel to the lamination direction of the conductive layers, Since they overlap, the influence of external magnetic fields caused by the flow of currents in the opposite directions can be offset against the magnetic field perpendicular to the direction of stacking of the conductive layers. S / N can be prevented from decreasing due to a strong magnetic field. Further, since the conductive patterns forming the winding advance coil and the rewinding coil are seen through from the direction parallel to the stacking direction of the conductive layers, the conductive patterns are overlapped on the back surface of the portion where the conductive pattern on the surface is formed. Compared to a conventional example in which a pattern is not formed (and vice versa), the number of turns of a toroidal coil can be increased even if a circuit board having the same size is used. Further, since the conductive pattern of the winding advance coil and the conductive pattern of the rewinding coil are formed in different conductive layers, an extra through hole is provided to overcome the conductive pattern of the winding advance coil and the conductive pattern of the rewinding coil. This is not necessary, and the total number of through holes in the circuit board does not increase, and it is possible to prevent a decrease in yield.
本発明の第１実施形態に係るロゴスキーコイルが形成された回路基板を示す正面図。1 is a front view showing a circuit board on which a Rogowski coil according to a first embodiment of the present invention is formed. 第１実施形態における回路基板の第１導電層に形成された第１導電パターンを示す正面図。The front view which shows the 1st conductive pattern formed in the 1st conductive layer of the circuit board in 1st Embodiment. 第１実施形態における回路基板の第２導電層に形成された第２導電パターンを示す正面図。The front view which shows the 2nd conductive pattern formed in the 2nd conductive layer of the circuit board in 1st Embodiment. 第１実施形態における回路基板の第３導電層に形成された第３導電パターンを示す正面図。The front view which shows the 3rd conductive pattern formed in the 3rd conductive layer of the circuit board in 1st Embodiment. 第１実施形態における回路基板の第４導電層に形成された第４導電パターンを示す正面図。The front view which shows the 4th conductive pattern formed in the 4th conductive layer of the circuit board in 1st Embodiment. 第２実施形態における回路基板の第１導電層に形成された第１導電パターンを示す正面図。The front view which shows the 1st conductive pattern formed in the 1st conductive layer of the circuit board in 2nd Embodiment. 第２実施形態における回路基板の第２導電層に形成された第２導電パターンを示す正面図。The front view which shows the 2nd conductive pattern formed in the 2nd conductive layer of the circuit board in 2nd Embodiment. 第２実施形態における回路基板の第３導電層に形成された第３導電パターンを示す正面図。The front view which shows the 3rd conductive pattern formed in the 3rd conductive layer of the circuit board in 2nd Embodiment. 第２施形態における回路基板の第４導電層に形成された第４導電パターンを示す正面図。The front view which shows the 4th conductive pattern formed in the 4th conductive layer of the circuit board in 2nd embodiment. 一般的なＣＴとロゴスキーコイルの外部磁界による影響の比較説明図。Comparison explanatory drawing of the influence by the external magnetic field of general CT and Rogowski coil. 従来のロゴスキーコイルを示す平面図。The top view which shows the conventional Rogowski coil. 従来のロゴスキーコイルの導電パターン及びスルーホールの構成を示す斜視図。The perspective view which shows the structure of the conductive pattern and through-hole of the conventional Rogowski coil.
（第１実施形態）
　本発明の第１実施形態に係るロゴスキーコイル型の電流測定用コイル（以下、「ロゴスキーコイル」という。）について説明する。図１に、第１実施形態に係るロゴスキーコイル１が形成された回路基板を示す。なお、図１では、分かりやすくするため、第１導電層（実線）と第２導電層（破線）の導電パターンのみを示す。また、図２~５はそれぞれ第１~第４導電層の導電パターンを示す。 (First embodiment)
A Rogowski coil type current measurement coil (hereinafter referred to as “Rogowski coil”) according to the first embodiment of the present invention will be described. FIG. 1 shows a circuit board on which a Rogowski coil 1 according to the first embodiment is formed. In FIG. 1, only the conductive patterns of the first conductive layer (solid line) and the second conductive layer (broken line) are shown for easy understanding. 2 to 5 show the conductive patterns of the first to fourth conductive layers, respectively.
　第１実施形態に係るロゴスキーコイル１は巻く方向が互いに逆である巻き進みコイル（第１コイル）及び巻き戻しコイル（第２コイル）を有し、４つの導電層（１０~４０）と３つの絶縁層を交互に積層して形成された回路基板２に形成されている。図１に示すように、回路基板２の中央部に、被測定電流が流れる導体を貫通させるための円形の開口３が形成されており、巻き進みコイル及び巻き戻しコイルは開口３を囲むように形成されている。また、回路基板２に円形の開口３に近い内周側に、直径が相違する２つの同心円Ｃ１及びＣ２の周上に所定間隔で、放射方向視で互いにずれるようにスルーホール６ｘ、６１、６２・・・及び８ｘ、８１、８２・・・が形成されている。また、開口３から遠い外周側には、同心円Ｃ３の周上に所定間隔でスルーホール５１、５２・・・及び７１、７２・・・が形成されている。なお、各スルーホールは、４つの導電層及び３つの絶縁層を貫通するように形成されている。 The Rogowski coil 1 according to the first embodiment has a winding coil (first coil) and a winding coil (second coil) whose winding directions are opposite to each other, and has four conductive layers (10 to 40) and 3 The circuit board 2 is formed by alternately laminating two insulating layers. As shown in FIG. 1, a circular opening 3 for penetrating a conductor through which a current to be measured passes is formed at the center of the circuit board 2, and the winding advance coil and the rewinding coil surround the opening 3. Is formed. Further, on the inner peripheral side close to the circular opening 3 on the circuit board 2, the through holes 6 x, 61, 62 are shifted from each other in a radial direction at predetermined intervals on the circumferences of two concentric circles C 1 and C 2 having different diameters. ... and 8x, 81, 82 ... are formed. Further, on the outer peripheral side far from the opening 3, through holes 51, 52..., 71, 72... Are formed at predetermined intervals on the circumference of the concentric circle C3. Each through hole is formed so as to penetrate through four conductive layers and three insulating layers.
　第１実施形態では、巻き進みコイル及び巻き戻しコイルは、それぞれトロイダルコイルとして形成されている。巻き進みコイルは、主に第２導電層２０の第２導電パターン２１ｘ、２１と、第４導電層４０の第４導電パターン４１ｘ、４１と、同心円Ｃ３の周上に形成されたスルーホール５１、５２・・・と、同心円Ｃ１の周上に形成されたスルーホール６ｘ、６１、６２・・・などで構成される。また、巻き戻しコイルは、主に第１導電層１０の第１導電パターン１１ｘ、１１と、第３導電層３０の第３導電パターン３１ｘ、３１と、外周側スルーホール７１、７２・・・と、同心円Ｃ２の周上に形成されたスルーホール８ｘ、８１、８２・・・などで構成される。 In the first embodiment, the winding advance coil and the rewinding coil are each formed as a toroidal coil. The winding coil mainly includes second conductive patterns 21x and 21 of the second conductive layer 20, fourth conductive patterns 41x and 41 of the fourth conductive layer 40, and through holes 51 formed on the circumference of the concentric circle C3. 52, and through holes 6x, 61, 62, etc. formed on the circumference of the concentric circle C1. The rewinding coil mainly includes the first conductive patterns 11x and 11 of the first conductive layer 10, the third conductive patterns 31x and 31 of the third conductive layer 30, and the outer through holes 71, 72,. , Etc., are formed by through holes 8x, 81, 82,... Formed on the circumference of the concentric circle C2.
　信号を取り出すための第１引き出し線部４は、図２に示す巻き進みコイルの始点部である第１導電層のスルーホール５１に接続されている。スルーホール５１は、図５に示す第４導電層４０に形成された導電パターンに接続され、第４導電層４０の導電パターン４１はスルーホール６１に接続される。スルーホール６１は、図３に示す第２導電層２０に形成された導電パターンに接続され、第２導電層２０の導電パターン２１はスルーホール５２に接続される。スルーホール５２は、図５に示す導電パターン４１によってスルーホール６２に接続される。以下、このようなループを開口３の周囲に時計回りに一周して、巻き進みコイルが形成される。巻き進みコイルの最後のスルーホール６ｘは、図２に示す第１導電層１０に形成された直線状の導電パターン１１ｘに接続され、導電パターン１１ｘはスルーホール７１に接続されている。 The first lead wire portion 4 for taking out the signal is connected to the through hole 51 of the first conductive layer which is the starting point portion of the winding coil shown in FIG. The through hole 51 is connected to the conductive pattern formed in the fourth conductive layer 40 shown in FIG. 5, and the conductive pattern 41 of the fourth conductive layer 40 is connected to the through hole 61. The through hole 61 is connected to the conductive pattern formed in the second conductive layer 20 shown in FIG. 3, and the conductive pattern 21 of the second conductive layer 20 is connected to the through hole 52. The through hole 52 is connected to the through hole 62 by the conductive pattern 41 shown in FIG. Thereafter, such a loop goes around the opening 3 clockwise to form a winding coil. The last through hole 6 x of the winding advance coil is connected to a linear conductive pattern 11 x formed in the first conductive layer 10 shown in FIG. 2, and the conductive pattern 11 x is connected to the through hole 71.
　スルーホール７１は、図４に示す第３導電層３０に形成された導電パターン３１によってスルーホール８１に接続される。スルーホール８１は、図２に示す第１導電層１０に形成された導電パターンに接続され、第１導電層１０の導電パターン１１によってスルーホール７２に接続される。スルーホール７２は、図４に示す導電パターン３１によってスルーホール８２に接続される。以下、このようなループを開口３の周囲に反時計回りに一周して、巻き戻しコイルが形成される。巻き戻しコイルの最後のスルーホール８ｘは、図３に示す第２導電層２０の直線状の導電パターン２ｘに接続され、巻き戻しコイルの終点部である導電パターン２ｘは信号を取り出すための第２引き出し線部５に接続されている。 The through hole 71 is connected to the through hole 81 by the conductive pattern 31 formed in the third conductive layer 30 shown in FIG. The through hole 81 is connected to the conductive pattern formed in the first conductive layer 10 shown in FIG. 2 and is connected to the through hole 72 by the conductive pattern 11 of the first conductive layer 10. The through hole 72 is connected to the through hole 82 by the conductive pattern 31 shown in FIG. Thereafter, such a loop is made around the opening 3 counterclockwise to form a rewinding coil. The last through-hole 8x of the rewinding coil is connected to the linear conductive pattern 2x of the second conductive layer 20 shown in FIG. 3, and the conductive pattern 2x which is the end point of the rewinding coil is a second for extracting a signal. The lead wire part 5 is connected.
　図２と図３を比較して分かるように、第１引き出し線部４と第２引き出し線部５は、それぞれ第１導電層１０と第２導電層２０に形成されており、スルーホール６を介して第１導電層１０の導電パターンと第２導電層２０の導電パターンが電気的に接続されている。第１引き出し線部４を構成する導電パターンと第２引き出し線部５を構成する導電パターンは、互いに電流が逆向きに流れ、導電層２の積層方向から透視して（以下、平面視と略称する）部分的に重なり合うＸ状（図１参照）の交差パターンに形成されている。 As can be seen by comparing FIG. 2 and FIG. 3, the first lead line portion 4 and the second lead line portion 5 are formed in the first conductive layer 10 and the second conductive layer 20, respectively. The conductive pattern of the first conductive layer 10 and the conductive pattern of the second conductive layer 20 are electrically connected via each other. In the conductive pattern constituting the first lead wire portion 4 and the conductive pattern constituting the second lead wire portion 5, currents flow in opposite directions and are seen through from the stacking direction of the conductive layer 2 (hereinafter abbreviated as a plan view). It is formed in an X-shaped intersection pattern (see FIG. 1) that partially overlaps.
　図２に示す第１導電層１０の各導電パターン１１ｘ、１１・・・の外側の放射状部分１１ａと図４に示す第３導電層３０の各導電パターン３１ｘ、３１・・・の外側の放射状部分３１ａは、平面視で互いに重なっている。また、図３に示す第２導電層２０の各導電パターン２１ｘ、２１・・・の外側の放射状部分２１ａと図５に示す第４導電層４０の各導電パターン４１ｘ、４１・・・の外側の放射状部分４１ａは平面視で互いに重なっている。一方、第１導電層１０及び第３導電層３０の各導電パターン１１ｘ、１１・・・３１ｘ、３１・・・の外側放射状部分１１ａ及び３１ａと第２導電層２０及び第４導電層４０の各導電パターン２１ｘ、２１・・・、４１ｘ、４１・・・の外側放射状部分２１ａ及び４１ａは、平面視で互いに重なっておらず、互に隣接している。 The outer radial portions 11a of the respective conductive patterns 11x, 11 ... of the first conductive layer 10 shown in FIG. 2 and the radial portions of the outer conductive patterns 31x, 31 ... of the third conductive layer 30 shown in FIG. 31a overlaps each other in a plan view. Further, the radial portions 21a outside the respective conductive patterns 21x, 21... Of the second conductive layer 20 shown in FIG. 3 and the outer sides of the respective conductive patterns 41x, 41. The radial portions 41a overlap each other in plan view. On the other hand, each of the outer radial portions 11a and 31a of the conductive patterns 11x, 11... 31x, 31..., The second conductive layer 20 and the fourth conductive layer 40 of the first conductive layer 10 and the third conductive layer 30. The outer radial portions 21a and 41a of the conductive patterns 21x, 21 ..., 41x, 41 ... do not overlap with each other in plan view and are adjacent to each other.
　また、図２に示す第１導電層１０の各導電パターン１１・・・の円周方向の部分１１ｂと図３に示す第２導電層２０の各導電パターン２１・・・の円周方向の部分２１ｂは、平面視で互いに重なっている。同様に、図４に示す第３導電層３０の各導電パターン３１・・・の円周方向の部分３１ｂと図５に示す第４導電層４０の各導電パターン４１・・・の円周方向の部分４１ｂは、平面視で互いに重なっている。さらに、図２に示す第１導電層１０の各導電パターン１１・・・の内側の放射状部分１１ｃと図４に示す第３導電層３０の各導電パターン３１・・・の内側の放射状部分３１ｃは、平面視で互いに重なっている。同様に、図３に示す第２導電層２０の各導電パターン２１・・・の内側の放射状部分２１ｃと図５に示す第４導電層４０の各導電パターン４１・・・の内側の放射状部分４１ｃは、平面視で互いに重なっている。 Further, a circumferential portion 11b of each conductive pattern 11 ... of the first conductive layer 10 shown in FIG. 2 and a circumferential portion of each conductive pattern 21 ... of the second conductive layer 20 shown in FIG. 21b overlaps each other in plan view. Similarly, a circumferential portion 31b of each conductive pattern 31 of the third conductive layer 30 shown in FIG. 4 and a circumferential direction of each conductive pattern 41 of the fourth conductive layer 40 shown in FIG. The portions 41b overlap each other in plan view. Furthermore, the radial portion 11c inside each conductive pattern 11 ... of the first conductive layer 10 shown in FIG. 2 and the radial portion 31c inside each conductive pattern 31 ... of the third conductive layer 30 shown in FIG. , They overlap each other in plan view. Similarly, the radial part 21c inside each conductive pattern 21 ... of the second conductive layer 20 shown in FIG. 3 and the radial part 41c inside each conductive pattern 41 ... of the fourth conductive layer 40 shown in FIG. Are overlapped with each other in plan view.
　このように、回路基板２は導電パターンが形成される導電層を４層有しており、巻き進みコイルと巻き戻しコイルをそれぞれ形成する導電パターンが、導電層の積層方向から透視して、重なり合っている、そのため、図１１に示す従来例に比べて、ロゴスキーコイル１の全ターン数を多くすることができ、出力信号の電圧が高くなり、Ｓ／Ｎを高くすることができる。また、巻き進みコイルの導電パターンと巻き戻しコイルの導電パターンが、互いに異なる導電層に形成されているため、巻き進みコイルの導電パターンと巻き戻しコイルの導電パターンを乗り越えるために余分なスルーホールを必要とせず、回路基板２の全スルーホール数は増加せず、歩留まりの低下を防止することが可能である。さらに、導電層の積層方向に平行な磁界に対して巻き進みコイルで囲まれた面積と巻き戻しコイルで囲まれた面積がほぼ等しいので、外部磁界から受ける影響で相殺し、ノイズ成分をより少なくしてＳ／Ｎをさらに高くすることができる。 Thus, the circuit board 2 has four conductive layers on which conductive patterns are formed, and the conductive patterns forming the winding advance coil and the rewinding coil overlap each other as seen through from the stacking direction of the conductive layers. Therefore, compared to the conventional example shown in FIG. 11, the total number of turns of the Rogowski coil 1 can be increased, the voltage of the output signal can be increased, and the S / N can be increased. In addition, since the conductive pattern of the winding advance coil and the conductive pattern of the rewinding coil are formed in different conductive layers, an extra through hole is provided to overcome the conductive pattern of the winding advance coil and the conductive pattern of the rewinding coil. This is not necessary, and the total number of through holes in the circuit board 2 does not increase, and it is possible to prevent a decrease in yield. Furthermore, the area surrounded by the winding coil and the area surrounded by the rewinding coil are almost equal to the magnetic field parallel to the stacking direction of the conductive layer, so it is offset by the influence from the external magnetic field, and the noise component is reduced. Thus, the S / N can be further increased.
　一方、導電層の積層方向に直交する外部磁界に対しては、トロイダルコイルのポロイダル方向の１ターンで囲まれた面積が影響を受けることになる。ところが、このロゴスキーコイル１は、複数の導電層と複数の絶縁層が積層された回路基板２に形成されており、前述のように、重なり合っている巻き進みコイルの導電パターン同士、重なり合っている巻き戻しコイルの導電パターンの同士、及び重なり合っている巻き進みコイルの導電パターンと巻き戻しコイルの導電パターンが、互いに逆方向に電流が流れるように配置されている。特に、被測定電流以外の電流などによって発生される外部磁界は、その電流に近いほど影響が大きいので、より近くの導電層に形成された導電パターンに流れる電流同士で相殺させることが好ましい。 On the other hand, the area surrounded by one turn in the poloidal direction of the toroidal coil is affected by the external magnetic field orthogonal to the stacking direction of the conductive layers. However, the Rogowski coil 1 is formed on the circuit board 2 in which a plurality of conductive layers and a plurality of insulating layers are laminated, and as described above, the conductive patterns of overlapping winding coils overlap each other. The conductive patterns of the rewinding coil, and the overlapping conductive patterns of the rewinding coil and the rewinding coil are arranged so that current flows in opposite directions. In particular, an external magnetic field generated by a current other than the current to be measured has a greater influence as it is closer to the current, and therefore, it is preferable to cancel the currents flowing in the conductive pattern formed in the closer conductive layer.
　第１引き出し線部４と第２引き出し線部５についても、第１引き出し線部４を構成する導電パターンと第２引き出し線部５を構成する導電パターンは、互いに電流が逆向きに流れるように、部分的に重なり合い、また平面視でＸ状となるような交差パターンに形成されている。そのため、外部磁界の影響に対しても、第１引き出し線部４に流れる電流と第２引き出し線部５に流れる電流が互いに相殺し合うので、第１引き出し線部４と第２引き出し線部５によるＳ／Ｎの低下を防止することができる。 Regarding the first lead-out line portion 4 and the second lead-out line portion 5 also, the conductive pattern constituting the first lead-out line portion 4 and the conductive pattern constituting the second lead-out line portion 5 are such that currents flow in opposite directions. , Partially intersecting, and formed in an intersecting pattern that is X-shaped in plan view. Therefore, the current flowing through the first lead line portion 4 and the current flowing through the second lead line portion 5 cancel each other against the influence of the external magnetic field, so the first lead line portion 4 and the second lead line portion 5 It is possible to prevent the S / N from being lowered.
（第２実施形態）
　次に、本発明の第２実施形態に係るロゴスキーコイルについて説明する。第２実施形態に係るロゴスキーコイル１ａも、４つの導電層と３つの絶縁層を交互に積層して形成された回路基板２に形成されており、図１に示す第１実施形態の場合と同様に、回路基板２の中央部に、被測定電流が流れる導体を貫通させるための円形の開口が形成されている（図示せず）。図６~９はそれぞれ第２実施形態における回路基板２の第１~第４導電層１１０、１２０、１３０、１４０の導電パターンを示す。また、第１実施形態と同様に、円形開口に比較的近い内周側には、２つの同心円Ｃ１及びＣ２の周上に一定間隔で、放射方向視でずれるように内周側のスルーホール１６ｘ、１６１・・・が形成されている。また、回路基板２の円形開口から比較的遠い外周側には、単一の円周Ｃ３の周上に所定間隔で外周側のスルーホール１５１・・・が形成されている。さらに、各スルーホールは、４つの導電層及び３つの絶縁層を貫通するように形成されている。 (Second Embodiment)
Next, the Rogowski coil according to the second embodiment of the present invention will be described. The Rogowski coil 1a according to the second embodiment is also formed on the circuit board 2 formed by alternately stacking four conductive layers and three insulating layers, and in the case of the first embodiment shown in FIG. Similarly, a circular opening for passing a conductor through which a current to be measured flows is formed in the center of the circuit board 2 (not shown). 6 to 9 show the conductive patterns of the first to fourth conductive layers 110, 120, 130, and 140 of the circuit board 2 in the second embodiment, respectively. Similarly to the first embodiment, on the inner peripheral side relatively close to the circular opening, the inner through hole 16x on the inner peripheral side so as to be displaced in a radial direction at regular intervals on the circumference of the two concentric circles C1 and C2. , 161... Are formed. Further, on the outer peripheral side relatively far from the circular opening of the circuit board 2, through holes 151... On the outer peripheral side are formed at predetermined intervals on the circumference of the single circumference C3. Further, each through hole is formed so as to penetrate through the four conductive layers and the three insulating layers.
　第２実施形態では、巻き進みコイルは、回路基板２を形成する第１導電層１１０と第４導電層１４０に形成された巻き進み導電パターンとこれら２つの導電層に形成された巻き進み導電パターンを電気的に接続するスルーホールで形成されたトロイダルコイルであり、巻き戻しコイルは、回路基板２を形成する第２導電層１２０に形成され、開口の周囲を略一周するように形成された平面コイルである。図８に示すように、第３導電層１３０には、信号を取り出すための第１引き出し線部４及び第２引き出し線部５を構成する導電パターンのみが形成されている。また、第４導電層１４０にも、第１引き出し線部４及び第２引き出し線部５を構成する他の部分の導電パターンが形成されている。 In the second embodiment, the winding advance coil includes a winding advance conductive pattern formed on the first conductive layer 110 and the fourth conductive layer 140 forming the circuit board 2 and a winding advance conductive pattern formed on these two conductive layers. The rewinding coil is formed on the second conductive layer 120 that forms the circuit board 2, and is a plane that is formed so as to substantially go around the opening. It is a coil. As shown in FIG. 8, the third conductive layer 130 is formed with only conductive patterns constituting the first lead line portion 4 and the second lead line portion 5 for taking out signals. The fourth conductive layer 140 is also formed with conductive patterns of other portions constituting the first lead line portion 4 and the second lead line portion 5.
　図８と図９を比較して分かるように、第１引き出し線部４と第２引き出し線部５は、スルーホール６を介して第３導電層１３０の導電パターンと第４導電層１４０の導電パターンに電気的に接続されている。第１実施形態と同様に、第１引き出し線部４を構成する導電パターンと第２引き出し線部５を構成する導電パターンは、互いに電流が逆向きに流れるように、平面視で、部分的に重なり合うＸ状の交差パターンに形成されている。 As can be seen by comparing FIG. 8 and FIG. 9, the first lead line portion 4 and the second lead line portion 5 are connected to the conductive pattern of the third conductive layer 130 and the conductive property of the fourth conductive layer 140 through the through hole 6. It is electrically connected to the pattern. As in the first embodiment, the conductive pattern constituting the first lead line portion 4 and the conductive pattern constituting the second lead line portion 5 are partially in plan view so that currents flow in opposite directions. Overlapping X-shaped intersection patterns are formed.
　図６に示すように、第１導電層１１０において、スルーホール１５ｘと１６ｘを除いて、外周部のスルーホール１５１・・・と内周部のスルーホール１６１・・・の間には、内周部の放射状部分の長さを除いてほぼ同じ形状の導電パターン１１１・・・が接続されている。図８に示すように、第１引き出し線部４は第３導電層１３０のスルーホール１５１に接続されており、スルーホール１５１は、図６に示す第１導電パターン１１０に接続され、第１導電パターン１１０の導電パターン１１１によってスルーホール１６１に接続される。スルーホール１６１は、図９に示す第４導電層１４０の導電パターンに接続され、第４導電層１４０に放射状に形成された導電パターン１４１によってスルーホール１５２に接続される。スルーホール１５２は、図６に示す導電パターン１１２によってスルーホール１６２に接続される。以下、このようなループを開口の周囲に時計回りに一周して、巻き進みコイルが形成される。 As shown in FIG. 6, in the first conductive layer 110, except for the through holes 15 x and 16 x, there is a gap between the outer peripheral through hole 151... And the inner peripheral through hole 161. Except for the length of the radial portion, the conductive patterns 111... Having substantially the same shape are connected. As shown in FIG. 8, the first lead line portion 4 is connected to the through hole 151 of the third conductive layer 130, and the through hole 151 is connected to the first conductive pattern 110 shown in FIG. The conductive pattern 111 of the pattern 110 is connected to the through hole 161. The through hole 161 is connected to the conductive pattern of the fourth conductive layer 140 shown in FIG. 9 and is connected to the through hole 152 by the conductive pattern 141 formed radially in the fourth conductive layer 140. The through hole 152 is connected to the through hole 162 by the conductive pattern 112 shown in FIG. Hereinafter, such a loop is rotated around the opening clockwise to form a winding advance coil.
　巻き進みコイルの最後のスルーホール１５ｘは、図７に示す第２導電層１２０に放射方向に形成された直線状の導電パターン１２１に接続されている。導電パターン１２１は内側のスルーホール１６１・・・を取り囲むように、反時計方向に略一周する環状の導電パターン１２２に接続されている。環状の導電パターン１２２の最後は、スルーホール１６ｘに接続され、図９に示すように、第４導電層１４０に形成された直線状の導電パターン１４ｘに接続され、導電パターン１４ｘは信号を取り出すための第２引き出し線部５に接続されている。 The last through hole 15x of the winding coil is connected to a linear conductive pattern 121 formed in the radial direction in the second conductive layer 120 shown in FIG. The conductive pattern 121 is connected to an annular conductive pattern 122 that makes a round in the counterclockwise direction so as to surround the inner through-holes 161. The end of the ring-shaped conductive pattern 122 is connected to the through hole 16x, and as shown in FIG. 9, is connected to the linear conductive pattern 14x formed in the fourth conductive layer 140. The conductive pattern 14x takes out a signal. Are connected to the second lead wire portion 5.
　なお、第２実施形態では、第１導電パターン１１０では、導電パターン１１１・・・の間隔を小さくするために、第１実施形態において円周部分に対応する部分を円周方向ではなく、円周方向に対して所定の角度を成すように、斜めに形成している。第２実施形態においても、巻き進みコイルと巻き戻しコイルをそれぞれ形成する導電パターンが、導電層の積層方向に平行な方向から透視して、重なり合うという条件を満たすために、第２導電層１２０の環状の導電パターン１２２が、前記斜めに形成された円周部分に重なるように鋸歯状に形成されている。それによって、上記第１実施形態の場合と同様の効果が得られる。 In the second embodiment, in the first conductive pattern 110, in order to reduce the interval between the conductive patterns 111..., The portion corresponding to the circumferential portion in the first embodiment is not a circumferential direction, but a circumferential direction. It is formed obliquely so as to form a predetermined angle with respect to the direction. In the second embodiment as well, in order to satisfy the condition that the conductive patterns forming the winding advance coil and the rewinding coil overlap each other as seen through from the direction parallel to the stacking direction of the conductive layers, An annular conductive pattern 122 is formed in a sawtooth shape so as to overlap the circumferential portion formed obliquely. Thereby, the same effect as in the case of the first embodiment can be obtained.
　第２実施形態の構成によれば、トロイダルコイルが第１導電層１１０の導電パターンと第４導電層１４０の導電パターン、及びこれらを電気的に接続するスルーホール１５１・・・及び１６１・・・で形成されている。そのため、本来の被測定電流を検出するためのトロイダルコイルのポロイダル方向の断面積が大きくなり、出力電圧を高くすることができる。 According to the configuration of the second embodiment, the toroidal coil has the conductive pattern of the first conductive layer 110 and the conductive pattern of the fourth conductive layer 140, and the through holes 151. It is formed with. Therefore, the cross-sectional area in the poloidal direction of the toroidal coil for detecting the original current to be measured is increased, and the output voltage can be increased.
　なお、本発明は、上記実施形態の説明に限定されるものではなく、様々な変形が可能である。例えば、３つの絶縁層のうち、中央の絶縁層の厚みを他の２つの絶縁層の厚みよりも厚くしてもよい。それによって、トロイダルコイルのポロイダル方向の断面積を大きくすることができ、出力電圧をさらに高くすることができ、Ｓ／Ｎをさらに改善することが可能となる。また、ビルトアップ基板を用いることにより、コイルの巻き数を増やすことが可能である。それによって、出力電圧をさらに高くすることができ、Ｓ／Ｎをさらに改善することが可能となる。
　以上、本発明の好ましい実施形態が説明されているが、本発明はこれらの特定の実施形態に限られるものではなく、請求範囲の範疇から離脱しない多様な変更及び変形が可能であり、それも本発明の範疇内に属する。 In addition, this invention is not limited to description of the said embodiment, A various deformation | transformation is possible. For example, among the three insulating layers, the thickness of the central insulating layer may be larger than the thickness of the other two insulating layers. Thereby, the cross-sectional area of the toroidal coil in the poloidal direction can be increased, the output voltage can be further increased, and the S / N can be further improved. Further, the number of turns of the coil can be increased by using the built-up substrate. Thereby, the output voltage can be further increased, and the S / N can be further improved.
The preferred embodiments of the present invention have been described above, but the present invention is not limited to these specific embodiments, and various modifications and variations that do not depart from the scope of the claims are possible. It belongs to the category of the present invention.

Claims (9)

  1. 　交互に積層された複数の導電層及び複数の絶縁層と、被測定電流が流れる導体を貫通させるための開口とを有する回路基板に、前記開口を取り囲むように形成された電流測定用コイルであって、
    　前記複数の導電層のうち２つ以上の導電層に形成される２つ以上の導電パターンを含む第１コイルと、
    　前記複数の導電層のうち他の一つ以上の導電層に形成される一つ以上の導電パターンを含む第２コイルと、
    　を有し、
    　前記複数の導電層の積層方向から見て、前記第１コイルと前記第２コイルは巻き方向が互いに逆になり、前記複数の導電層の積層方向に平行な磁界による影響を受ける、前記第１コイルで囲まれた面積と前記第２コイルで囲まれた面積がほぼ等しく、
    　前記複数の導電層に形成された前記第１コイル及び第２コイルの複数の前記導電パターンが、前記複数の導電層の積層方向から見て、重なり合っていることである電流測定用コイル。     A current measuring coil formed on a circuit board having a plurality of conductive layers and a plurality of insulating layers alternately stacked and an opening for passing through a conductor through which a current to be measured passes, so as to surround the opening. And
    A first coil including two or more conductive patterns formed in two or more conductive layers of the plurality of conductive layers;
    A second coil including one or more conductive patterns formed on one or more other conductive layers of the plurality of conductive layers;
    Have
    When viewed from the stacking direction of the plurality of conductive layers, the first coil and the second coil are wound in opposite directions, and are affected by a magnetic field parallel to the stacking direction of the plurality of conductive layers. The area surrounded by the coil and the area surrounded by the second coil are approximately equal,
    A current measuring coil in which the plurality of conductive patterns of the first coil and the second coil formed in the plurality of conductive layers overlap each other when viewed from the stacking direction of the plurality of conductive layers.
  2. 　前記複数の導電層の積層方向に直交する磁界によって、互いに重なり合っている前記第１コイルの導電パターン同士、互いに重なり合っている前記第２コイルの導電パターンの同士、及び前記第１コイルの導電パターンと前記第２コイルの導電パターンが、互いに逆方向に電流が流れるようになっていることである請求項１に記載の電流測定用コイル。 Due to the magnetic field orthogonal to the stacking direction of the plurality of conductive layers, the conductive patterns of the first coil that overlap each other, the conductive patterns of the second coil that overlap each other, and the conductive patterns of the first coil The current measuring coil according to claim 1, wherein currents flow in directions opposite to each other in the conductive pattern of the second coil.
  3. 　前記第１コイルの前記導電パターンを電気的に接続する複数の第１スルーホールと、
    　前記第２コイルの前記導電パターンを電気的に接続する複数の第２スルーホールと、
    を更に含み、
    　前記第１コイルの前記導電パターンと前記第２コイルの前記導電パターンはそれぞれ前記複数の導電層のうち互いに異なる導電層に形成され、
    　前記第１コイルは、前記２つの導電層に形成された前記第１コイルの導電パターンと前記第１コイルの導電パターンを電気的に接続する前記第１スルーホールで形成されたトロイダルコイルであり、
    　前記第２コイルは、前記他の２つの導電層に形成された第２コイルの導電パターンと前記第２コイルの導電パターンを電気的に接続する前記第２スルーホールで形成されたトロイダルコイルであることである請求項１又は請求項２に記載の電流測定用コイル。     A plurality of first through holes that electrically connect the conductive patterns of the first coil;
    A plurality of second through holes that electrically connect the conductive patterns of the second coil;
    Further including
    The conductive pattern of the first coil and the conductive pattern of the second coil are respectively formed in different conductive layers among the plurality of conductive layers,
    The first coil is a toroidal coil formed by the first through hole that electrically connects the conductive pattern of the first coil formed in the two conductive layers and the conductive pattern of the first coil;
    The second coil is a toroidal coil formed by the second through hole that electrically connects the conductive pattern of the second coil formed in the other two conductive layers and the conductive pattern of the second coil. The current measuring coil according to claim 1 or claim 2.
  4. 　前記第１コイルの前記導電パターンを電気的に接続する複数の第１スルーホールを更に含み、
    　前記第１コイルの前記導電パターンは、前記複数の導電層のうち２つの導電層に形成され、前記第２コイルの前記導電パターンは前記複数の導電層のうち他の一つの導電層に形成され、
    　前記第１コイルは、前記複数の導電層のうち２つの導電層に形成された第１コイルの導電パターンと第１コイルの導電パターンを電気的に接続する前記第１スルーホールで形成されたトロイダルコイルであり、
    　前記第２コイルは、前記複数の導電層のうち他の１つの導電層に形成され、前記開口の周囲を略一周するように形成された平面コイルであることである請求項１又は請求項２に記載の電流測定用コイル。     A plurality of first through holes that electrically connect the conductive patterns of the first coil;
    The conductive pattern of the first coil is formed on two conductive layers of the plurality of conductive layers, and the conductive pattern of the second coil is formed on another conductive layer of the plurality of conductive layers. ,
    The first coil is a toroidal formed by the first through hole that electrically connects the conductive pattern of the first coil formed in two conductive layers of the plurality of conductive layers and the conductive pattern of the first coil. Coil,
    The said 2nd coil is a planar coil formed in the other one conductive layer among the said some conductive layers, and was formed so that the circumference | surroundings of the said opening may be carried out substantially once. The coil for current measurement described in 1.
  5. 　前記複数の第１及び第２スルーホールが前記複数の導電層の積層方向に形成され、前記開口に比較的近い内周側において、直径の異なる２つの同心円周上に所定間隔をおいて放射方向視で互いにずれるように形成される複数の内周側スルーホールと、前記開口から比較的遠い外周側において単一の同心円周上に所定間隔で形成されている複数の外周側スルーホールを含むことである請求項３又は請求項４に記載の電流測定用コイル。 The plurality of first and second through holes are formed in the stacking direction of the plurality of conductive layers, and on the inner peripheral side relatively close to the opening, radial directions are spaced apart from each other on two concentric circles having different diameters. Including a plurality of inner peripheral through holes formed so as to be shifted from each other and a plurality of outer peripheral through holes formed at a predetermined interval on a single concentric circumference on the outer peripheral side relatively far from the opening. The coil for current measurement according to claim 3 or 4, wherein
  6. 　前記複数の導電層の数は４つであり、前記複数の絶縁層の数は３つであり、前記第１及び第２スルーホールは前記４つの導電層及び前記３つの絶縁層を全て貫通するように形成されていることである請求項５に記載の電流測定用コイル。 The number of the plurality of conductive layers is four, the number of the plurality of insulating layers is three, and the first and second through holes penetrate all the four conductive layers and the three insulating layers. The current measuring coil according to claim 5, wherein the current measuring coil is formed as described above.
  7. 　前記３つの絶縁層のうち、中央の絶縁層の厚みは他の２つの絶縁層の厚みよりも厚いことである請求項６に記載の電流測定用コイル。 The current measuring coil according to claim 6, wherein, of the three insulating layers, the thickness of the central insulating layer is thicker than the thicknesses of the other two insulating layers.
  8. 　前記第１コイルの始点部に接続された第１引き出し線部と、
    　前記第２コイルの終点部に接続された第２引き出し線部と、を更に含み、
    　前記第１引き出し線部と前記第２引き出し線部は、互いに電流が逆向きに流れるようなパターンに形成されていることである請求項１乃至請求項７のいずれか一項に記載の電流測定用コイル。     A first lead wire connected to a starting point of the first coil;
    A second lead wire portion connected to the end point portion of the second coil,
    8. The current measurement according to claim 1, wherein the first lead line part and the second lead line part are formed in a pattern in which currents flow in opposite directions to each other. Coil.
  9. 　前記第１引き出し線部と前記第２引き出し線部が前記複数の導電層のうち異なる導電層に形成されていることである請求項８に記載の電流測定用コイル。 The current measuring coil according to claim 8, wherein the first lead wire portion and the second lead wire portion are formed in different conductive layers among the plurality of conductive layers.
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