KR102013286B1 - Current sensor - Google Patents

Abstract

The present invention relates to a current detection device, which comprise: a substrate and a segment coil unit having a plurality of rod-shaped segment coils arranged and mounted in a polygonal shape on the substrate. Each segment coil includes a rod-shaped core and a coil winding wound around the core. The sum of interior angles of polygons formed by the segment coils is greater than 360 degrees or the size of the interior angles formed by each core of two adjacent section coils is greater than 90 degrees.

Description

Current sensing device {CURRENT SENSOR}

The present invention relates to a current sensing sensor, and more particularly, to a fragmentary current sensing device for sensing a direct current as well as an alternating current.

With the recent surge in power usage and the increase in the number of consumers using large power, accurate measurement of current is essential for the protection of power systems and for maximizing power usage efficiency.

In other words, in terms of customers, it is possible to improve current efficiency by analyzing and predicting power demand through accurate measurement of electric current.In terms of power system, it is possible to measure not only rated current but also fault current to measure power system. The fault system generating fault current in the power system is quickly disconnected to protect the power system.

For the current measurement, current sensing devices currently used include a current transformer (CT), a Rogowski sensor, and the like, and in general, a current sensing device in the form of a current transformer (CT) is commonly used.

Current transformer (CT) using a coil wound around the core (core) improves the measurement sensitivity of the current according to the magnetic field focusing effect due to the use of the iron core.

However, due to the magnetic saturation of the iron core used as the core, an error occurs, and the current range that can be measured within a certain error range with a single current transformer is very small, thus accurately detecting a fault current of several tens to several hundred times the rated current. It is almost impossible to do.

Therefore, in order to increase the measurement current range of the current, the size of the current transformer CT should be increased, but the size and weight should be taken into consideration due to the use of the iron core, so that the current transformer cannot measure the current more than a certain range. In addition, the iron core causes a lot of problems in downsizing the current transformer.

In addition, current transformers that use iron cores have errors due to magnetization strength, temperature change, or current characteristics. Therefore, in order to increase the accuracy of the measurement current, manufacturing cost of changing the material of the iron core or adding a signal correction circuit is required. There is a problem that increases and the structure is complicated.

Rogowski sensor is a sensor that does not use the iron core to solve the problem of magnetic saturation due to the iron core, it measures the current using a Rogowski core, a circular air core coil.

Thus, Rogowski sensors measure the current, greatly reducing the error range of the measurement current, increasing the measurement range of the current, and improving the linearity of the signal.

However, the Rogowski sensor has a problem in that the measurement sensitivity of the current decreases due to the absence of an iron core, and thus, accurate current measurement is not performed due to the influence of an external electromagnetic field applied from the outside, and thus the coil in a circular shape When winding the winding, it is difficult to align the coils with uniform spacing and uniform density to wind the windings.

Therefore, in order to solve such a problem, a current sensing device using a coil slice, which is an electromagnetic element in which a Rogowski coil is wound in a rod shape, has been developed and used. However, since the coil section is made of a coil winding in a straight line rather than a circular shape, the number of turns is reduced compared to a coil wound in a circular shape, so that a leakage phenomenon of the magnetic field occurs and accurate current sensing is not achieved.

Korea Electro-Patent No. 10-1939569 (announcement date January 17, 2019, title of the invention: Rogowski coil current sensor having a shielding structure)

Therefore, the technical problem to be achieved by the present invention is to achieve a miniaturization of the current sensing device.

Another technical object of the present invention is to improve the accuracy of the measurement of the current sensing device.

Another object of the present invention is to provide a current sensing device capable of measuring an alternating current as well as a direct current.

The current sensing device according to an aspect of the present invention for solving the above problems includes a segment coil portion having a substrate and a plurality of rod-shaped segment coils arranged and mounted in a polygonal shape on the substrate, each segment coil And a rod-shaped core and a coil winding wound around the core, wherein the sum of the polygonal angles formed by the section coils is greater than 360 degrees or the size of the cabinet angles formed by each core of two adjacent section coils is greater than 90 degrees.

The number of the plurality of segment coils may be even.

The core may be made of a material having a specific permeability of 1 or more.

The core may be made of silicon, epoxy, polyethylene terephthalate (PET), glass or gold, iron, ferrite, and the like.

The current sensing device may further include a signal line and a pad disposed on the substrate and positioned between the two adjacent fragment coils and electrically connecting two adjacent fragment coils.

The current sensing device may further include a signal processor connected to one coil winding of the plurality of segment coils and the other coil winding of the plurality of segment coils.

The current sensing device according to the above feature may further include a shield surrounding each segment coil.

The shielding part may be made of a metallic material or may be coated with a shielding paint on a non-metallic material.

The substrate may be a printed circuit board.

The current sensing device according to the above feature may further include at least one DC component and a leakage magnetic field sensing unit positioned between two adjacent fragment coils to measure a signal of the DC component.

The DC component and the leakage magnetic field detector may be a Hall sensor or a magnetic sensor.

According to this aspect of the invention, the rod-shaped section coils made of one electromagnetic element arranged in a polygon on the substrate, and electrically connected between two adjacent section coils to increase the number of windings of the coil winding of the section coil portion Effect occurs. This reduces the amount of leakage magnetic flux and improves the accuracy of the measurement current.

In addition, since each section coil uses a core, the influence of an external magnetic field generated in the absence of the core is minimized.

The core used is made of a material with a high permeability with a specific permeability of 1 or more, and is composed of a plurality of segments, so that a closed circuit is not formed magnetically so that the magnetic saturation point is high, so that the reduction of the current measurement range due to magnetic saturation does not occur. . For this reason, the current measuring device of the present example can measure a large current while increasing the measuring range of the current and miniaturization.

Furthermore, since the rod-shaped section coils are mounted on the substrate using surface mount technology and an automatic insertion process, the manufacturing time of the current measuring device is greatly shortened and the manufacturing cost is also reduced.

In addition, the DC component and the leakage magnetic field detecting unit positioned between two adjacent fragment cores to detect and output a signal of a DC component can measure not only an AC signal but also a DC signal.

Moreover, the mounting density of the cutting core portion is increased by the direct current component and the leakage magnetic field sensing portion, which enables a more circular arrangement of the cutting core portions, thereby increasing the accuracy of the detected current.

1 is a conceptual diagram of a current measuring device according to an embodiment of the present invention.
2 is a schematic structure of a current measuring device according to an embodiment of the present invention showing a state in which a shield is mounted on each of the fragment coils.
3 is a conceptual diagram of a current measuring device according to another embodiment of the present invention.
FIG. 4 is a schematic structure of a current measuring device according to another embodiment of the present invention, in which a shield is mounted on each of the fragment coils.
5A to 5C are current sensing devices fabricated according to an embodiment of the present invention, respectively. FIG. 5A illustrates four segment coils, FIG. 5B illustrates six segment coils, and FIG. 5B illustrates eight This is the case when a section coil is used.
6 to 8 are waveforms for measuring the distortion state of the output current when the magnetic bodies having the same magnitude magnetic field flowing in FIG. 5A to FIG. 5B are located nearby.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention; In describing the present invention, adding specific descriptions of techniques or configurations already known in the art may make the gist of the present invention unclear.

If so, some of them will be omitted in the detailed description. In addition, terms used in the present specification are terms used to properly express the embodiments of the present invention, which may vary according to related persons or customs in the art. Therefore, the definitions of the terms should be made based on the contents throughout the specification.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a,” “an,” and “the” include plural forms as well, unless the phrases clearly indicate the opposite. As used herein, the meaning of “comprising” specifies a particular characteristic, region, integer, step, operation, element, and / or component, and other specific characteristics, region, integer, step, operation, element, component, and / or group. It does not exclude existence or addition.

Hereinafter, a current sensing device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

First, referring to FIGS. 1 and 2, a current sensing device 100 according to an embodiment of the present invention will be described.

As shown in FIGS. 1 and 2, the current measuring device 100 of the present example includes a substrate 110 and a plurality of (eg, six) fragment coils 121-126 mounted on the substrate 110. And a shielding unit 140 surrounding each of the fragment coils 121 to 126, and a signal processing unit 130 connected to the fragment coil unit 120.

The substrate 110 may be a printed circuit board on which the fragment coil unit 120 and the signal processing unit 130 are mounted. For example, the substrate 110 may be a flexible printed circuit board (FPCB) or a rigid substrate. It may be a hard printed circuit board (HPCB).

Accordingly, as shown in FIG. 1, the substrate 11 includes a plurality of signal lines S11 and electrical signal lines S11 and an intercept coil 121 for electrical connection between two adjacent segment coils (eg, 121 and 122). 122, a plurality of pads (P11) for the electrical connection between, and a plurality of signal lines and a plurality of signal lines for input and output and power supply of signals to the electromagnetic elements (not shown) forming the signal processing unit 130 Pads and the like.

As described above, the fragment coil unit 120 includes a plurality of fragment coils 121-126 mounted on the substrate 110 at a predetermined polygonal shape with a predetermined distance therebetween.

At this time, if possible, reduce the distance between adjacent section coils (eg, 121, 122) to place the plurality of section coils 121-126 as close as possible to increase the density of the arrangement of the section coils 121-126, and the section coil section. The arrangement form of 120 is arranged as close as possible to a circle. Therefore, the effect of increasing the number of turns occurs, thereby reducing the amount of magnetic flux leaking, thereby improving the accuracy of the measurement current.

As shown in FIG. 1, the empty space 111 exists in the part enclosed by the several fragment coil 121-126.

The plurality of piece coils 121-126 mounted on the substrate 110 all have the same shape and are made of a plurality of pieces.

That is, each of the segment coils 121-126 includes a core C211 in the form of a rod and a coil winding W121 uniformly wound around the core C121 at a predetermined interval and a uniform density possible in the winding process.

Therefore, the portion of the core C121 in which the coil winding W121 is wound has the same thickness within the error range regardless of the position.

In order to solve the problem caused by the magnetic saturation caused by the use of the core to improve the linearity of the signal, the core C121 of this example has a relative permeability (μr) of 1 or higher material depending on the signal strength. That is, a material having a specific permeability (μr) of 1 or more or no magnetic saturation phenomenon is used.

Accordingly, the core C121 of the present example may be made of silicon, epoxy, more specifically FR4 epoxy, polyethylene terephthalate (PET), glass, gold, iron, ferrite, or the like.

As such, in the case of the present example, as the core C121 of such a material is used, despite the implementation of the section coils 121 to 126 using the core, the effect of using the core core is exerted, so that the detection sensitivity of the current is improved. Is improved.

As shown in FIG. 1, both terminals of the coil winding W121 are connected to the corresponding terminals of the corresponding coil winding W121 of the other segment coils 121-126 immediately adjacent through the corresponding signal line S11 and the pad P11. Connected.

For example, in the case of the first to third segment coils 121 to 123 sequentially arranged in the left direction or the right direction, one terminal of the coil winding W121 of the first segment coil 121 may be a second segment coil. It is connected to the other terminal of the coil winding (W121) of the 122, one terminal of the coil winding (W121) of the second segment coil 122 and the other terminal of the coil winding (W121) of the third segment coil (123) Connected.

In this way, the coil windings W121 of the two segment coils (eg, 121 and 122) adjacent to each other along the corresponding direction are electrically and physically connected through the signal line S11 and the pad P11.

At this time, the coil winding of the first section coil (for example, the section coil disposed at the start position of the sequential arrangement in the predetermined direction (eg, the left direction) among the plurality of section coils 121-126). A section located at the end of the sequential arrangement in one direction of the terminal and the last section coil (e.g., in a left direction) of (W121) and next to the first section coil 121 (e.g., right) The other terminal of the coil winding W121 of the coil 126 is connected to the input terminal of the signal processor 130 through the signal line S11 and the pad P11.

By the signal lines S11 positioned between the two adjacent fragment coils 121-126, the arrangement form of the fragment coil unit 120 positioned on the substrate 110 may have a substantially circular shape.

When a plurality of segment coils 121-126 consisting of an even number (6 in FIG. 1) are positioned on the substrate 110, two segment coils (eg, 121, 124) are formed in pairs and opposite sides. Are facing each other at

Therefore, as shown in FIG. 1, if the number of segment coils 121-126 is six, three pairs of segment coils 121-124, 122-125, and 123-126 exist. As such, since the two segment coils 121-124, 122-125, and 123-126 are located opposite to each other, the canceling effect of the noise component occurs, thereby improving the accuracy of the measured current.

Since the plurality of segment coils 121 to 126 are mounted on the substrate 110 in a form close to a circle, an angle formed by two adjacent segment coils (eg, 125 and 126), and more specifically, two adjacent coils 125 and 125. The size of the inner angle θ formed by each core C121 of 126 is greater than 90 degrees or the sum of the inner angles of polygons formed according to the mounting state of the section coil part 120 is greater than 360 degrees.

In addition, the number of section coils disposed in the section coil unit 120 may be six to twenty.

Specifically, as shown in FIG. 1, in two adjacent segment coils, for example, the fifth segment coil 125 and the sixth segment coil 126, the center of the core C121 of the fifth segment coil 125 is present. From the first extension line L11 extending along the extension direction of the core C121 (that is, the longitudinal direction) and the first extension line L12 extending along the centerline of the core C121 of the sixth segment coil 126. The size of the internal angle (hereinafter, referred to as 'an internal angle formed by two adjacent cores') θ is greater than 90 degrees.

In addition, the sum of the angles of the polygons formed according to the mounting state of the fragment coil part 120 is the angle of the polygons formed by the straight line connecting the fragment coils 121-126 and two adjacent fragment coils 121-126 in a straight line. It is sum.

As such, when the number of pieces of coils is 6 or more, miniaturization of the current sensing device 100 is achieved, and the same effect as the coil winding is wound around the circular core reduces the distortion of the current waveform with respect to the external magnetic field. do.

In addition, when the number of pieces of coils is 20 or less, the effect that occurs when using a circular core without a significant increase in the weight and volume of the current sensing device 100 due to the increase in the number of pieces of coils is exerted.

As described above, since the current sensing device 100 of the present example uses a plurality of fragment coils 121 to 126 using the core C121 instead of the fragment coil using the air core coil, the magnetic field focusing effect by the core C121 is reduced. Is generated to improve the measurement sensitivity of the current.

In addition, due to the rod-shaped section coil, the influence of the eddy current is reduced, so that the magnetic saturation time point is higher than that of winding the core in a closed curve shape, and thus has excellent magnetic flux density (B) -magnetic field strength (H) characteristics.

Instead of using one section coil having a rod shape using an air core coil, the section coils 121-126 are arranged in a shape close to a circle using an even number, so that the coil winding is wound around a circular core. The distortion of the current waveform with respect to the external magnetic field is reduced.

That is, in the case of the rod-shaped section coil, the winding state at both terminal portions of the section coil is unstable, and greatly affected by the electromagnetic field applied from the outside.

However, in the present invention, since the even number of fragment coils 121 to 126 are connected to each other using the signal line S11 and the pad P11, the coil windings W121 are arranged in a substantially circular shape, and thus the magnetic field The effect of the closed curve of the coil winding (W121) is exerted so that the number of turns increases.

This reduces the influence on the external magnetic field and increases the measurement sensitivity of the current due to the increase in the number of turns.

The influence of the external magnetic field according to the increase in the section coil will be described with reference to FIGS. 5A to 8.

5A to 5C are current sensing devices fabricated according to an embodiment of the present invention, respectively. FIG. 5A illustrates a case of using four fragment coils, and FIG. 5B illustrates a case of using six fragment coils. This is the case with two piece coils.

6 to 8 are each for measuring the distortion state of the output current when the magnetic material (for example, the conducting wire) generating a magnetic field of the same size in the vicinity of Figs. 5A to 5C, respectively, 7A and 7A are waveforms obtained by measuring a current flowing through a conductor passing through a hole surrounded by a fragment coil part, respectively, (b) and (b) of FIG. And (b) of FIG. 8, the waveforms of the currents flowing through the conductors passing through the holes surrounded by the fragment coil portions when the same magnetic bodies are positioned near the fragment coil portions, respectively. At this time, the input current is 5A and the driving voltage is ± 3.3V.

As shown in FIG. 6, when the internal angle formed by two adjacent fragment coils is 90 degrees, when the magnetic material is located near the fragment coil portion, it can be seen that a signal distortion occurs when the level of the current waveform is changed as compared with the case where the magnetic body is not located. .

On the other hand, as shown in Figs. 7 and 8, when the inner angle formed by two adjacent section coils is greater than 90 degrees, when the magnetic material does not exist even when a magnetic material is present near the section coil part because it is hardly influenced by an external magnetic field. It can be seen that a current almost similar to is detected.

In addition, as shown in FIGS. 7 and 8, it can be seen that as the number of piece coils increases, that is, the closer the shape of the piece coils to the circular shape, the less the distortion of the current signal is affected by the external magnetic field. have.

As such, the rod-shaped section coils 121 to 126 made of one electromagnetic element are mounted on the substrate 110 by using surface mount technology (SMT) on the substrate 110 to use a circular core. The effect of the CT is obtained.

However, since the size of the section coil unit 120 of the present example using the plurality of section coils 121 to 126 is much smaller than that of the current transformer CT, the size of the section coil unit 120 may be measured while reducing the size of the measured current range. Can be increased significantly. As a result, large current can be measured while miniaturizing the size of the current measuring device.

The current measuring range of the current measuring device 100 of the present example may be 1 ~ 1,000A.

In addition, since the rod-shaped section coil 121-16 is mounted on the substrate 110 by using a surface mounting technique and an automatic insertion process, manufacturing time and manufacturing cost of the current measuring device 100 are greatly reduced.

Referring back to FIG. 1, the signal processor 130, which is connected to the coil segment 120 through the signal line S11 and the pad P11, is also mounted on the substrate 110 using a surface mount technology.

The signal processor 130 senses the current output from the coil segment 120, processes the detected signal, and outputs the current measured by the corresponding power system to the outside.

To this end, the signal processing unit 120 includes a current measuring resistor located between the input terminals, an amplifier connected to both ends of the current measuring resistor, a noise removing unit connected to the amplifying unit, and the like.

In addition, the current sensing device 100 of the present example may include an analog-to-digital converter (AD converter) for converting the analog connected to the signal processor 120 into digital.

Accordingly, the controller controls the operating state of the power system by monitoring the operating state of the power system using the current current signal applied through the AD converter. For example, the controller may measure at least one of a maximum value, an effective value, an average value, and a peak value of the measured current, and determine the operating state of the current power system using the measured values.

In this case, when the current sensing device 100 further includes a display unit, the controller outputs an operation state of the power system to a state display unit (for example, a liquid crystal display, a segment display device, a light emitting diode, etc.). Visually confirm the operating status. Alternatively, the administrator checks the power system for abnormality and performs a protective operation to cut off the circuit power.

In another example, the current sensing device 110 may further include a communication unit in the AD converter to transmit the measured current to an external device through the communication unit. Therefore, a manager or a person who manages or has an external device checks the output current state of the current system measured in real time.

The shield 140 shown in FIG. 1 shields electromagnetic waves applied from the outside to reduce the influence of each coil fragment 121-126 due to external electromagnetic waves.

The shield 140 may be made of a copper foil, specifically, a PCB copper foil, a metallic material such as aluminum, copper, or iron, or a shielding paint may be applied to a nonmetallic material.

Therefore, the current measuring device 100 of the present example improves the accuracy of the current measuring device 100 due to the shielding effect of the electromagnetic wave using the shielding unit 140.

In addition, since the coil pieces 121 to 126 are formed in the form of rods, the shield 140 may be easily formed and installed, and the problems caused by the weight and volume of the shield 140 may be greatly reduced.

In FIGS. 1 and 2, the section coil sections 120 are all comprised of section coils 121-126, but in an alternative example, at least one of the section coils 121-126 arranged in a polygonal shape may have a quadrangular shape. It can be made of a metal piece in the same predetermined form. Even in this case, due to the characteristics of the metal, the metal pieces form a magnetic circuit, and current flows through the located metal, thereby performing a normal current sensing operation.

Next, referring to FIGS. 3 and 4, the current sensing device 100a according to another embodiment of the present invention will be described.

Compared to FIGS. 1 and 2, components having the same structure and performing the same operation are denoted by the same reference numerals as those of FIGS. 1 and 2, and detailed description thereof will be omitted.

As shown in FIGS. 3 and 4, the current sensing device 100a of the present example is mounted on the substrate 110 and the substrate 110 similarly to the current sensing device 100 of FIG. 1, and is connected to the signal line S11. A plurality of segment coils 121 to 126 are arranged in a circular shape using a pad P11, and a segment coil portion 120a is formed using a signal line S11 and a pad P11. ) And a shielding unit 140 surrounding the signal processing unit (eg, the first signal processing unit) 130 and the respective coil fragments 121-126.

The structure of each of the fragment coils 121-126 also includes a winding coil W121 wound around the core C121 and the coil C121 as described above.

The number of section coils provided in the section coil unit 120a may be 6 to 20, and the sum of the angles of the polygons formed by the section coils 121 to 126 is greater than 360 degrees or two adjacent section coils (eg, The size (theta) of the cabinet formed by each core C121 of 121 and 122 is more than 90.

However, the fragment coil part 120a of the current sensing device 100a of the present example may be located between two adjacent fragment coils to measure at least one DC component connected to two adjacent fragment coils and a DC component and a leakage magnetic field detector ( 1211) is further provided.

In addition, the current sensing device 100a is connected to the signal processing unit (eg, the second signal processing unit) 131 and the second signal processing unit 131 connected to each DC component and the leakage magnetic field detecting unit 1211, respectively. A third signal processing unit 132 for collecting and processing signals applied from the signal processing unit 131 is further provided.

At this time, the electrical and physical connection between the DC component and the leakage magnetic field detector 1211 and the corresponding segment coils 121-126 is also made by signal lines and pads disposed on the substrate 110, and each DC component and the leakage magnetic field are detected. The connection between the unit 1211 and the second signal processor 131 and the connection between the second signal processor 131 and the third signal processor 132 are also performed by signal lines and pads disposed on the substrate 110.

These current component and leakage magnetic field detectors 1211 and second and third signal processors 131 and 132 are also mounted at predetermined positions of the substrate 110 using surface mount technology.

In this example, the DC component and the leakage magnetic field detector 1211 may be a hall sensor using a hall effect, a magnetic sensor or a coil using a magnetoresistance effect. In addition, if amplifying the signal further favors the measurement, a coil can be inserted to further amplify the detection signal.

As described above, since the DC component and the leakage magnetic field detecting unit 1211 are positioned between at least one of the two adjacent fragment coils 121 to 126, the mounting area of the fragment coil unit 120a is increased to increase the area of the fragment coil unit 120a. The placement density increases and the placement of the section coil part 120a is made closer to the circular shape. Due to this arrangement, the effect of increasing the number of turns on the section coil part 120a is further exerted, thereby reducing the amount of leakage current, thereby increasing the detection sensitivity of the current, thereby further improving the accuracy of the detected current.

Similar to the first signal processor 130, the second signal processor 131 includes an amplifier, a noise remover, and the like, and processes the signal output from the connected DC component and the leakage magnetic field detector 1211.

In addition, the third signal processor 132 connected to the at least one second signal processor 131 is for processing a signal applied from each second signal processor 131 to output one detection signal.

The third signal processor 132 acts as a filter to layer the magnetic field signal of the conductor to be measured and remove noise components mixed in the signal, and converts the output into a signal range of a device used as an input. .

The leakage magnetic field generated because the intercepting cores 121 to 126 are formed in the intercepting shape is detected by the DC component and the leakage magnetic field detecting unit 1211, and the third signal processing unit 132 is provided through the corresponding second signal processing unit 131. Is applied. Accordingly, the third signal processor 132 performs a compensation operation of the leaked magnetic field sensed through an amplification process using an amplifier or the like to detect a good current that is not affected by the leaked magnetic field.

In the current measuring apparatuses 100 and 100a described above, the fragment coil parts 120 and 120a are mounted on one substrate 110, so that the plurality of fragment coils 121-12n of the fragment coil parts 120 and 120a are provided. And at least one direct current component and leakage magnetic field detector 1211 are mounted.

However, in another alternative example, the current measuring device may be implemented by symmetrically mounting (eg, symmetrically) the cut-off coil and the DC component and the leakage magnetic field detector if necessary on a plurality of substrates (eg, two). At this time, there is a signal line and a pad for electrically connecting the fragment coil mounted on each substrate to the DC component and the leakage magnetic field sensing unit.

At this time, one side of each substrate is connected to each other and only the other side is separated, each substrate can be electrically and physically connected to each other in the movement in the left and right direction relative to the one side connected or the connection state can be released. Electrical and physical connection of the substrates separated from each other may be made through signal lines or wires formed in the substrate.

In the above, embodiments of the current sensing device of the present invention have been described. The present invention is not limited to the above-described embodiment and the accompanying drawings, and various modifications and variations will be possible in view of those skilled in the art to which the present invention pertains. Therefore, the scope of the present invention should be defined not only by the claims of the present specification but also by the equivalents of the claims.

100, 100a: current measuring device 110: substrate
120, 120a: section coil section 121-126: section coil
1211: DC component and leakage magnetic field detector
130, 131, 132: signal processing unit
S11: signal line P11: pad

Claims (12)

Board; And
Section coil section having a plurality of rod-shaped section coils are arranged in a polygonal form on the substrate
Including,
Each segment coil comprises a rod-shaped core and a coil winding wound around the core,
The sum of the internal angles of the polygons formed by the intercept coils is greater than 360 degrees or the size of the internal angles of each core of two adjacent intercept coils is greater than 90 degrees. According to claim 1,
And at least one of the plurality of piece coils is a metal piece. According to claim 1,
And the number of the plurality of segment coils is an even number. According to claim 1,
And the core is made of a material having a specific permeability of 1 or more. According to claim 1,
The core is a current sensing device consisting of silicon, epoxy, polyethylene terephthalate (PET), glass or gold, iron or ferrite. According to claim 1,
And a signal line and a pad disposed on the substrate and electrically connected between two adjacent fragment coils and electrically connecting two adjacent fragment coils. According to claim 1,
A signal processor connected to one coil winding of the plurality of segment coils and another coil winding of the plurality of segment coils
A current sensing device further comprising. According to claim 1,
And a shield enclosing each segment coil. The method of claim 8,
The shielding part is made of a metallic material or a current sensing device coated with a non-metallic shielding paint. According to claim 1,
And the substrate is a printed circuit board. According to claim 1,
And at least one DC component and a leakage magnetic field detector positioned between two adjacent fragment coils to measure a signal and a leakage magnetic field of the DC component. The method of claim 11, wherein
And the direct current component and the leakage magnetic field sensing unit are hall sensors or magnetic sensors.

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