KR101939051B1 - Apparatus for sensing current - Google Patents

Abstract

The current sensing device according to various embodiments includes a first substrate portion passing a circuit along one direction and a first coil portion formed on the first substrate portion and surrounding the circuit, And a second coil part formed on the second substrate part and surrounding the circuit, the circuit part being formed on the circuit part, And a second sensing unit configured to sense the generated leakage current.

Description

[0001] APPARATUS FOR SENSING CURRENT [0002]

Various embodiments relate to current sensing devices.

In general, the current sensing device senses the current in the circuit between the power source and the load. The current sensing device includes an insulative body surrounding the circuit and a coil wound around the body and applied with an electromagnetic field. The current sensing device calculates the current of the circuit from the electromagnetic field generated in the circuit, based on the electromagnetic induction phenomenon.

However, there is a problem that the performance of the current sensing device is not uniformly ensured. That is, depending on the manufacturing environment of the current sensing device, the performance of the current sensing device can be determined differently. This is because the manufacturing process such as winding the coil around the body is performed manually. As a result, the reliability of the current calculated by the current sensing device may be low.

According to various embodiments, manual procedures can be minimized in the fabrication process of the current sensing device. Thus, the performance of the current sensing device can be ensured uniformly. Thus, the reliability of the current calculated in the current sensing device can be improved.

A current sensing device according to various embodiments includes a first substrate portion passing a circuit along one direction and a first coil portion formed on the first substrate portion and surrounding the circuit, A second substrate portion laminated on the first substrate portion and passing the circuit along the one direction, and a second substrate portion formed on the second substrate portion and surrounding the circuit, And a second sensing unit configured to sense a leakage current generated on the circuit.

According to various embodiments, the second sensing portion may further include at least one core portion that is disposed apart from the second coil portion at the second substrate portion and surrounds the circuit.

According to various embodiments, the second substrate portion may include a plurality of base substrates stacked along the one direction.

According to various embodiments, the core portion may be inserted between at least any two of the base substrates.

According to various embodiments, the first substrate portion may include a plurality of base substrates each formed with the first coil portion and stacked along the one direction.

According to various embodiments, the intensity of the electromagnetic field applied to the first sensing unit from the load current may be determined according to the number of base substrates.

According to various embodiments, the first sensing portion may further include at least one core portion disposed at a distance from the first coil portion at the first substrate portion, and surrounding the circuit.

According to various embodiments, the core portion may be inserted between at least any two of the base substrates.

According to various embodiments, the first coil portion may include pattern portions formed on surfaces defined perpendicularly to the one direction in the base substrates, and pattern portions passing through the base portions in the one direction, And may include connecting portions for connecting.

According to various embodiments, the circuit may include a plurality of current lines through which the load current flows, respectively.

According to various embodiments, the first coil portion may surround the current lines individually.

According to various embodiments, the second coil portion may surround the current lines at once.

According to various embodiments, the first substrate portion may include a plurality of unit substrate portions each passing the current lines.

According to various embodiments, the first sensing unit may further include a first shielding portion disposed between the unit substrate portions.

According to various embodiments, the first sensing unit may include a second shielding portion surrounding the first substrate portion about the one direction, a third shielding portion disposed between the first substrate portion and the second sensing portion, And a fourth shielding portion disposed on the opposite side of the third shielding portion with respect to the first substrate portion.

According to various embodiments, the first sensing unit may be a current transformer (CT), and the second sensing unit may be a zero current transformer (ZCT).

According to various embodiments, the sensing unit may be implemented in a structure in which a first sensing unit for sensing a load current and a second sensing unit for sensing a leakage current are stacked. That is, in the sensing unit, the first sensing unit and the second sensing unit may be integrated. Therefore, not only the size of the sensing portion can be reduced, but also the sensing portion can be easily manufactured. As a result, the performance of the current sensing device can be uniformly ensured while manual procedures are minimized in the manufacturing process of the current sensing device. Thus, the reliability of the current calculated in the current sensing device can be improved.

1 is a block diagram illustrating a current sensing device in accordance with various embodiments.
2 is a block diagram illustrating a current sensing device in accordance with one embodiment.
3 is a perspective view illustrating the sensing unit according to an embodiment of the present invention.
4 is a perspective view illustrating a sensing unit according to an embodiment of the present invention.
5 is a front view showing a sensing unit according to an embodiment.

Hereinafter, various embodiments of the present document will be described with reference to the accompanying drawings. However, it should be understood that the techniques described herein are not intended to limit the particular embodiments, but rather include various modifications, equivalents, and / or alternatives. In connection with the description of the drawings, like reference numerals may be used for similar components.

In this document, the expressions "have," "have," "include," or "may include" refer to the presence of such features, such as numerals, functions, And does not exclude the presence of additional features.

As used herein, the expressions " first " or " second ", and the like, may denote various components, regardless of their order and / or importance, and may be used only to distinguish one component from another But do not limit the components.

1 is a block diagram illustrating a current sensing device 100 in accordance with various embodiments.

Referring to FIG. 1, a current sensing device 100 according to various embodiments may be disposed on the circuit 10. At this time, the circuit 10 connects the power source 20 and the load 30, and current can flow from the power source 20 to the load 30 along the circuit 10. And the circuit 10 may include a plurality of current lines. For example, the circuit 10 may be a single-phase two-wire system, a three-phase three-wire system, or a three-phase four- It can be provided in any one of them. Here, the first current can be defined as the current flowing on the circuit 10, that is, the load current. The current sensing device 100 may include a sensing unit 110 and a control unit 190.

The sensing unit 110 may sense an induced current corresponding to the first current. At this time, as the first current flows on the circuit 10, an electromagnetic field can be generated about the circuit 10. Here, an electromagnetic field can be generated around each current line. Accordingly, an electromagnetic field can be applied to the sensing unit 110. [ The sensing unit 110 may generate an induced current corresponding to the electromagnetic field. The sensing unit 110 may include a first sensing unit 120 and a second sensing unit 160.

The first sensing unit 120 may sense the second current based on the first current. The first sensing unit 120 can generate a second current from the electromagnetic field in accordance with the electromagnetic induction phenomenon. At this time, the first sensing unit 120 may generate a second current corresponding to each current line. Here, the second current may be defined as a current induced from each current line in the first sensing unit 120. [

The second sensing unit 160 may sense the third current based on the first current. The second sensing unit 160 can generate a third current from the electromagnetic field in accordance with the electromagnetic induction phenomenon. At this time, the second sensing unit 160 may generate a third current corresponding to the entire current lines. Here, the third current may be defined as a current induced from the entire current lines in the second sensing unit 160.

The control unit 190 can grasp the characteristics of the first current based on the induced current of the sensing unit 110. Here, the controller 190 stores the parameters of the sensing unit 110 in advance, and can use it to determine the characteristics of the first current. At this time, the control unit 190 may calculate the first current based on the second current. Then, the control unit 190 can calculate the leakage current generated on the circuit 10 based on the third current.

2 is a block diagram illustrating a current sensing device (100, 200 in FIG. 1) according to one embodiment.

Referring to FIG. 2, a current sensing device 100, 200 according to one embodiment may be disposed on a circuit (10, 11 in FIG. 1). At this time, the circuits 10 and 11 may be provided in a three-phase three-wire system. These circuits 10 and 11 may include a first current line 13, a second current line 15, and a third current line 17. The current sensing devices 100 and 200 may include a sensing unit (110 and 210 in FIG. 1) and a control unit (190 and 290 in FIG. 1).

The sensing units 110 and 210 may pass the circuits 10 and 11 along one direction. The sensing units 110 and 210 may generate an induced current corresponding to the electromagnetic field. At this time, as the load current flows on the first current line 13, the second current line 15 and the third current line 17, the first current line 13, the second current line 15, An electromagnetic field can be generated around each of the three current lines 17. On the other hand, an electromagnetic field can be synthesized between the first current line 13, the second current line 15, and the third current line 17. The sensing units 110 and 210 may include a first sensing unit 120 and 220 and a second sensing unit 160 and 260 of FIG.

The first sensing units 120 and 220 may pass the circuits 10 and 11 along one direction. At this time, the first sensing unit 120 and the second sensing unit 220 may pass the first current line 13, the second current line 15, and the third current line 17 individually. Here, the electromagnetic field of each of the first current line 13, the second current line 15, and the third current line 17 may be applied to the first sensing unit 220. The first sensing unit 120 and the second sensing unit 220 may generate a second current corresponding to the first current line 13, the second current line 15, and the third current line 17, respectively. For example, the first sensing units 120 and 220 may be a current transformer (CT). The first sensing units 120 and 220 may include a first driving unit 221, a second driving unit 223, and a third driving unit 225.

The first driving unit 221 can pass the first current line 13. The first driving unit 221 may generate a second current corresponding to the first current line 13. In this case, the first driving unit 221 may include a first sensing device 222. The first sensing element 222 may output a voltage corresponding to the second current corresponding to the first current line 13. Here, the first sensing element 222 may have a predetermined resistance.

And the second driving unit 223 can pass the second current line 15. The second driving unit 223 can generate a second current corresponding to the second current line 15. [ The second driving unit 223 may include a second sensing device 224. The second sensing element 224 may output a voltage corresponding to the second current corresponding to the second current line 15. [ Here, the second sensing element 224 may have a predetermined resistance.

The third driver 225 can pass the third current line 17. The third driving unit 225 may generate a second current corresponding to the third current line 17. In this case, the third driving unit 225 may include a third sensing device 226. The third sensing element 226 may output a voltage corresponding to the second current corresponding to the third current line 17. Here, the third sensing element 226 may have a predetermined resistance.

The second sensing units 160 and 260 may pass the circuits 10 and 11 along one direction. At this time, the second sensing units 160 and 260 can pass the first current line 13, the second current line 15, and the third current line 17 at a time. Here, an electromagnetic field can be synthesized between the first current line 13, the second current line 15 and the third current line 17. As a result, if an electromagnetic field is present between the first current line 13, the second current line 15, and the third current line 17, the corresponding electromagnetic field can be applied to the second sensing units 160 and 260 . Accordingly, the second sensing units 160 and 260 can generate the third current corresponding to the entire first current line 13, the second current line 15, and the third current line 17. For example, the second sensing units 160 and 260 may be a zero current transformer (ZCT). The second sensing unit 160, 260 may include an output device 261. The output element 261 can output a voltage corresponding to the third current. Here, the output element 261 may have a predetermined resistance. For example, if there is no leakage current on the circuits 10 and 11, the result of the synthesis of the electromagnetic field between the first current line 13, the second current line 15 and the third current line 17 becomes 0 < / RTI > In this case, the electromagnetic field is not applied to the second sensing units 160 and 260, and the third current may be zero.

The control units 190 and 290 may be connected to the sensing units 110 and 210. At this time, the control units 190 and 290 may be individually connected to the first sensing units 120 and 220 and the second sensing units 160 and 260, respectively. And the control unit 190, 290 can calculate the first current based on the second current. Here, the control units 190 and 290 can detect voltages corresponding to the first driving unit 221, the second driving unit 223, and the third driving unit 225, respectively. Accordingly, the control units 190 and 290 can calculate the first currents of the first current line 13, the second current line 15, and the third current line 17, respectively. Further, the control unit 190, 290 can calculate the leakage current generated on the circuit 11 based on the third current. Here, the controller 190, 290 can detect the voltage based on the third current. Thereby, the control unit 190, 290 can calculate the leakage current on the circuits 10, 11. For example, when no electromagnetic field is applied to the second sensing portions 160 and 260 between the first current line 13, the second current line 15, and the third current line 17, 0 < / RTI > In this case, the controller 190, 290 can determine that there is no leakage current on the circuit 10, 11.

3 is a perspective view of the sensing unit (210 and 310 of FIG. 2) in an exploded view. 4 is a perspective view illustrating the sensing units 210 and 310 according to an embodiment of the present invention. 5 is a front view showing the sensing units 210 and 310 according to an embodiment.

3, 4 and 5, the sensing units 210 and 310 may pass the circuit 11 along one direction. The sensing units 210 and 310 may surround the circuit 11. In this case, the sensing units 210 and 310 may be implemented as a printed circuit board (PCB). Accordingly, the sensing units 210 and 310 can generate an induced current corresponding to the electromagnetic field of the circuit 11. The sensing units 210 and 310 may include first sensing units 220 and 320 and second sensing units 260 and 360 in FIG. At this time, the first sensing units 220 and 320 may be stacked on the second sensing units 260 and 360 along one direction.

The first sensing units 220 and 320 may pass the circuit 11 along one direction. At this time, the first sensing units 220 and 320 may pass the first current line 13, the second current line 15, and the third current line 17 individually. The first sensing portions 220 and 320 may surround the first current line 13, the second current line 15, and the third current line 17 individually. The first sensing units 220 and 320 may include a first substrate unit 330, a first coil unit 340, and a shielding unit 350.

The first substrate portion 330 may support the first coil portion 340 and the shielding portion 350. Here, the first substrate portion 330 may be formed of an insulating material. The first substrate portion 330 may include at least one base substrate 331, 333, 335, and 337. When the first substrate portion 330 includes a plurality of base substrates 331, 333, 335, and 337, the base substrates 331, 333, 335, and 337 may be stacked along one direction. Here, each of the base substrates 331, 333, 335, and 337 may have a flat plate structure. For example, each of the base substrates 331, 333, 335, and 337 may be formed as a single layer, or may be formed as a multi-layered structure. (The base substrates constituting the first substrate portion are referred to as "first base substrates ", and the second substrate portions are not referred to as " second base portions " The base substrates are divided into "second base substrates ".)

According to one embodiment, the first substrate portion 330 may include a plurality of unit substrate portions 330a, 330b, and 330c. In this case, the first substrate portion 330 may be divided into unit substrate portions 330a, 330b, and 330c on a plane perpendicular to one direction. The unit board portions 330a, 330b, and 330c can pass the first current line 13, the second current line 15, and the third current line 17 individually. To this end, the unit substrate portions 330a, 330b, and 330c may include first pass portions 339a, 339b, and 339c, respectively. The first passing portions 339a, 339b, and 339c may be formed through the unit substrate portions 330a, 330b, and 330c, respectively. For example, the cross sections of the first passing portions 339a, 339b, and 339c are defined on a plane perpendicular to one direction, and may have a circular or polygonal shape. Thus, the first current line 13, the second current line 15, and the third current line 17 can pass through the first pass portions 339a, 339b, and 339c, respectively.

The first coil portion 340 may generate a second current from an applied electromagnetic field. To this end, the first coil part 340 may be mounted on the first substrate part 330. Here, the first coil part 340 may be formed of a conductive material. The first coil portion 340 may include pattern portions 341 and connecting portions 343. The pattern portions 341 may be mounted on the surfaces of the base substrates 331, 333, 335, and 337. The connection portions 343 may penetrate the base substrates 331, 333, 335, and 337. The connection portions 343 can connect the pattern portions 341. Accordingly, the intensity of the applied electromagnetic field can be determined according to the number of the base substrates 331, 333, 335, and 337.

According to one embodiment, the first coil portion 340 may include a plurality of unit coil portions 340a, 340b, and 340c. The unit coil portions 340a, 340b, and 340c may be mounted on the unit substrate portions 330a, 330b, and 330c, respectively. The unit coil portions 340a, 340b, and 340c may surround the first current line 13, the second current line 15, and the third current line 17 individually. Thereby, based on the electromagnetic field applied from each of the unit coil portions 340a, 340b, and 340c from the first current line 13, the second current line 15, and the third current line 17, Current can be generated. Here, the unit coil portions 340a, 340b, and 340c may operate as the first driving unit 221, the second driving unit 223, and the third driving unit 225 of FIG. 2, respectively.

The shielding portion 350 may shield the first sensing portion 320. The shielding part 350 may isolate the first current line 13, the second current line 15 and the third current line 17 from each other in the first sensing part 320. [ To this end, the shielding portion 350 may entirely surround the first substrate portion 330 and may surround the unit substrate portions 330a, 330b, and 330c individually. The shielding part 350 may include a first shielding part 351, a second shielding part 353, a third shielding part 355 and a fourth shielding part 357. The first shielding portion 351 may be disposed between the unit substrate portions 330a, 330b, and 330c in the first substrate portion 330. [ The second shielding portion 353 may surround the first substrate portion 330 about one direction. The third shielding portion 355 may be disposed between the first sensing portion 320, that is, between the first substrate portion 330 and the second sensing portion 360. The fourth shielding portion 357 may be disposed on the opposite side of the third shielding portion 355 with respect to the first substrate portion 330. Here, the third shielding portion 355 and the fourth shielding portion 357 can open the first passage portions 339a, 339b, and 339c.

The second sensing units 260 and 360 may pass the circuit 11 along one direction. At this time, the second sensing units 260 and 360 can pass the first current line 13, the second current line 15, and the third current line 17 at a time. The second sensing units 260 and 360 may surround the first current line 13, the second current line 15, and the third current line 17 at a time. The second sensing portions 260 and 360 may include a second substrate portion 370, a second coil portion 380, and at least one core portion 385.

The second substrate portion 370 can support the second coil portion 380 and the core portion 385. Here, the second substrate portion 370 may be formed of an insulating material. The second substrate portion 370 may include at least one base substrate 371, 373, 375, 377. When the second substrate portion 370 includes a plurality of base substrates 371, 373, 375, and 377, the base substrates 371, 373, 375, and 377 may be stacked along one direction. Here, each of the base substrates 371, 373, 375, and 377 may have a flat plate structure. For example, each of the base substrates 371, 373, 375, and 377 may be formed as a single layer, or may be formed in multiple layers.

According to one embodiment, the second substrate portion 370 can pass the first current line 13, the second current line 15, and the third current line 17 at a time. To this end, the second substrate portion 370 may include at least one second passage portion 379. The second passage portion 379 may be formed through the base substrates 371, 373, 375, and 377. For example, the cross section of the second passage portion 379 is defined on a plane perpendicular to one direction, and may have a circular or polygonal shape. In this case, when the second substrate portion 370 includes one second passage portion 379, the first current line 13, the second current line 15, And can pass through the passing portion 379. Here, the second passage portion 379 may be formed so as to cover all the first passage portions 339a, 339b, and 339c corresponding to the first passage portions 339a, 339b, and 339c. When the second substrate portion 370 includes a plurality of second passing portions 379, the first current line 13, the second current line 15, and the third current line 17 are connected to the second Pass portions 379, respectively. Here, the second passage portions 379 may correspond to the first passage portions 339a, 339b, and 339c, respectively.

The second coil portion 380 may generate a third current from the applied electromagnetic field. To this end, the second coil portion 380 may be mounted on the second substrate portion 370. Here, the second coil portion 380 may be formed of a conductive material. The second coil portion 380 may include pattern portions 381 and connection portions 383. The pattern units 381 may be mounted on the surfaces of the base substrates 371, 373, 375, and 377. The connection portions 383 can penetrate the base substrates 371, 373, 375, and 377. The connection portions 383 can connect the pattern portions 381. [

According to one embodiment, the second coil portion 380 can surround the first current line 13, the second current line 15, and the third current line 17 at a time. Here, when the second substrate portion 370 includes one second passage portion 379, the second coil portion 380 may surround the outer region of the second passage portion 379. [ On the other hand, when the second substrate portion 370 includes a plurality of second passage portions 379, the second coil portion 380 may surround the entire outer region of the second passage portions 379. This allows the second coil portion 380 to generate a third current based on the electromagnetic field applied and synthesized between the first current line 13, the second current line 15 and the third current line 17 .

The core portion 385 can strengthen the electromagnetic field applied to the second coil portion 380. [ Through this, the core portion 385 can amplify the third current. For example, even if the third current corresponds to several milliamperes (mA), the plurality of core portions 385 can be amplified so that it can be sensed. To this end, the core portion 385 may be mounted on the second substrate portion 370. Here, the core portion 385 may be disposed between at least any two of the base substrates 371, 373, 375, and 377. For example, a plurality of core portions 385 may be disposed apart from each other between the base substrates 371, 373, 375, and 377. At this time, the core portion 385 can surround the first current line 13, the second current line 15, and the third current line 17 at once. And the core portion 385 may be disposed apart from the second coil portion 380. [ That is, the core portion 385 may not contact the second coil portion 380. [ Here, the core portion 385 may be formed of a conductive material. The core portion 385 may also be embodied as a circular or polygonal ring, for example.

According to another embodiment, the first sensing portions 220 and 320 may further include at least one core portion (not shown). At this time, the second sensing units 260 and 360 may include the core unit 385 or may not include the core unit 385. Here, the core portion of the first sensing portions 220 and 320 may be referred to as a first core portion, and the core portion 385 of the second sensing portions 260 and 360 may be referred to as a second core portion. The first core part can strengthen the electromagnetic field applied to the first coil part 340. [ Thereby, the first core part can amplify the second current. To this end, the first core portion may be mounted on the first substrate portion 330. Here, the first core portion may be disposed between at least any two of the base substrates 331, 333, 335, and 337. For example, a plurality of first core portions may be disposed apart from each other between the base substrates 331, 333, 335, and 337. At this time, the first core portion may surround the first current line 13, the second current line 15, and the third current line 17 individually. And the first core portion may be disposed apart from the first coil portion 340. That is, the first core portion may not contact the first coil portion 340. Here, the first core portion may be formed of a conductive material. Further, the first core portion may be embodied as a circular or polygonal ring shape, for example.

According to another embodiment, the current sensing device (100 in FIG. 1) can be variously implemented in accordance with the circuit (10 in FIG. 1). That is, the sensing unit 110 of the current sensing device 100 may be implemented according to the number of current lines in the circuit 10. [ For example, the circuit 10 may be formed as a single-phase two-wire type or a three-phase four-wire type. In this case, the sensing unit 110 may be implemented as a printed circuit board. Here, in the sensing unit 110, the first sensing unit 120 (shown in FIG. 1) may pass the current lines separately, and the second sensing unit 160 (shown in FIG. 1) may simultaneously pass the current lines.

According to various embodiments, a first current may flow from the power source 20 to the load 30 along the circuit 10, 11. Thus, based on the first current, an electromagnetic field can be generated about the circuit 10, 11. Here, an electromagnetic field can be generated around each of the current lines 13, 15, and 17. At this time, an electromagnetic field can be applied to the sensing units 110, 210 and 310. Here, the electromagnetic field of each of the current lines 13, 15, and 17 may be applied to the first sensing units 120, 220, and 320. Accordingly, the first sensing units 120, 220, and 320 can generate the second current corresponding to the current lines 13, 15, and 17, respectively. Accordingly, the controller 190, 290 can calculate the first current based on the second current of each of the current lines 13, 15, 17. On the other hand, an electromagnetic field can be synthesized between the current lines 13, 15, and 17. As a result, if an electromagnetic field exists between the current lines 13, 15, and 17, the electromagnetic field can be applied to the second sensing units 160, 260, and 360. Accordingly, the second sensing units 160, 260 and 360 can generate the third current corresponding to the entire current lines. Thus, the controller 190, 290 can calculate the leakage current on the circuit 10, 11 based on the third current.

According to various embodiments, the sensing units 110, 210, and 310 may include first sensing units 120, 220, and 320 for sensing a load current, and second sensing units 160 and 260 , And 360 may be stacked. That is, the first sensing units 120, 220 and 320 and the second sensing units 160, 260 and 360 may be integrated in the sensing units 110, 210 and 310. Accordingly, not only the size of the sensing units 110, 210 and 310 but also the sensing units 110, 210 and 310 can be easily manufactured. Thus, the performance of the current sensing devices 100 and 200 can be uniformly maintained while manual procedures are minimized in the fabrication process of the current sensing devices 100 and 200. Accordingly, the reliability of the current calculated in the current sensing devices 100 and 200 can be improved.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the other embodiments. The singular expressions may include plural expressions unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art. The general predefined terms used in this document may be interpreted in the same or similar sense as the contextual meanings of the related art and, unless expressly defined in this document, include ideally or excessively formal meanings . In some cases, even the terms defined in this document can not be construed as excluding the embodiments of this document.

Claims (10)

A current sensing device comprising:
A first substrate portion having a first pass portion having a plurality of current lines and passing through a circuit flowing in one direction and having a plurality of first base substrates stacked in a direction perpendicular to the circuit; And a first coil part formed on the first substrate part, the first sensing part sensing a load current flowing on the circuit; And
A second substrate portion having a plurality of second base substrates having a second passing portion through which the circuit passes, and stacked in a direction perpendicular to the circuit; A second coil part formed on the second substrate part; And a second sensing part including a core part provided between the plurality of base boards of the second substrate part and sensing a leakage current flowing on the circuit,
Wherein the first substrate portion has a plurality of unit substrate portions disposed on the same plane,
Wherein the first passing portion is formed for each unit substrate portion,
Wherein the first coil portion comprises a unit coil portion formed adjacent to the first passage portion,
The current lines are individually passed through the unit substrate portions,
Wherein the second substrate portion is formed with a plurality of second pass portions corresponding to the plurality of first pass portions,
The second coil portion is formed on an outer portion of the second substrate portion,
Wherein the core portion is formed in a ring shape to surround the plurality of current lines,
And a first shielding portion provided between the unit substrate portions. delete delete The apparatus according to claim 1,
Wherein an intensity of an electromagnetic field applied to the first sensing unit from the load current is determined according to the number of the base boards. 5. The method of claim 4,
Wherein the first sensing unit comprises:
And a core portion inserted between at least any two of the first base substrates. [5] The apparatus of claim 4, wherein the first coil unit comprises:
Patterning portions formed on the surfaces of the first base substrates defined at right angles to the one direction; And
And connecting portions connecting the pattern units through the first base boards along the one direction. delete delete The apparatus of claim 1, wherein the first sensing unit comprises:
A second shielding portion surrounding the first substrate portion about the one direction;
A third shielding portion disposed between the first substrate portion and the second sensing portion; or
And a fourth shield disposed opposite the third shield with respect to the first substrate. The method according to claim 1,
The first sensing unit may be a current transformer (CT)
And the second sensing unit is a zero current transformer (ZCT).

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