WO2019216511A1 - Capteur de courant à bobine de rogowski avec structure de blindage - Google Patents

Capteur de courant à bobine de rogowski avec structure de blindage Download PDF

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Publication number
WO2019216511A1
WO2019216511A1 PCT/KR2018/014941 KR2018014941W WO2019216511A1 WO 2019216511 A1 WO2019216511 A1 WO 2019216511A1 KR 2018014941 W KR2018014941 W KR 2018014941W WO 2019216511 A1 WO2019216511 A1 WO 2019216511A1
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Prior art keywords
rogowski coil
current sensor
shield
coil current
substrate
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PCT/KR2018/014941
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English (en)
Korean (ko)
Inventor
정년
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주식회사 인피니어
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Application filed by 주식회사 인피니어 filed Critical 주식회사 인피니어
Publication of WO2019216511A1 publication Critical patent/WO2019216511A1/fr

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    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
    • 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
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • G01R15/207—Constructional details independent of the type of device used

Definitions

  • the present invention relates to a current sensor, and more particularly, to a low current measurement, and to a Rogowski coil current sensor having a shielding structure capable of minimizing the influence of electromagnetic noise.
  • current sensors currently used include a current transformer, a shunt, a hall sensor, a Rogowski sensor, and a current in the form of a current transformer (CT) in Korea and abroad. Sensors are the most used.
  • CT current transformer
  • FIG. 1 is a view schematically showing the principle of measuring the current in a conventional Rogowski current sensor.
  • the conventional Rogowski current sensor passes through the inside of Rogowski coil 3, in which the power medium 1 to be measured current is uniformly wound along a circular concentric core 2 of non-magnetic material.
  • the output voltage E induced by the current passing through the power medium 1 is integrated through the integrating circuit and amplified to calculate the current value flowing in the power medium 1.
  • the main goal of the Rogowski current sensor is to minimize the error range of the current measurement. For this purpose, it is important to block the influence of noise caused by external electromagnetic fields during the operation of the Rogowski current sensor.
  • Japanese Patent Application Laid-Open No. 10-1466453 current sensing device and method
  • the first of the segmented winding elements is the rear end of the segmented winding elements.
  • a structure for electrically bonding to a thing Disclosed is a structure for electrically bonding to a thing.
  • Korean Patent Laid-Open Publication No. 10-2016-0107192 high bandwidth Rogowski transducer with shielding coil
  • a structure having a double working internal screen is disclosed.
  • such a segment structure or a double screen structure may improve the effect of blocking electromagnetic noise, but the structure for blocking noise is complicated and the manufacturing cost increases.
  • Korean Patent Publication No. 10-1169301 discloses a structure in which a Rogowski coil is wound twice by dividing the PCB substrate into internal and external regions.
  • the Rogowski coil current sensor which improved the shielding of the noise added to the side of a PC board using copper foil plating through the arc (Rogowski coil current sensor excellent in noise shielding, and its manufacturing method) was disclosed.
  • the Rogowski coil is shaped into a pattern on a printed circuit board (PCB), since the number of turns of the Rogowski coil is limited by the PCB structure, it is difficult to measure low current.
  • European Patent Application Publication No. EP 02560013 (Rogowski coil assemblies and methods for providing the same), European Patent Publication No. EP 01302773 (Screening device for Rogowski current measuring apparatus), US Patent Publication No. US 20080048646 ( PRECISION, TEMPERATURE-COMPENSATED, SHIELDED CURRENT MEASUREMENT DEVICE, etc., propose various Rogowski coil structures, but if all of them adopt PCB structure, low current measurement is difficult due to the limitation of the number of windings. In this case, the structure of shielding electromagnetic waves is complicated, and thus, the manufacturing cost is rapidly increased.
  • Patent Registration No. 10-1169301 (2012.07.30)
  • Patent Publication No. 10-1466453 (2014.11.21)
  • the present invention is to solve the above problems, while using a rod-type Rogowski coil in the PCB, by providing a shield structure capable of effective electromagnetic shielding to provide a current sensor that can be implemented at a low cost have.
  • the Rogowski coil current sensor of the present invention in the current sensor, the rod-type Rogowski coil fragment and the first substrate on which the circuit elements are mounted, the rod-type Rogowski coil fragment and A second shield formed of a structure covering the circuit elements, wherein the first substrate is spaced apart from the first PCB region and the first PCB region by a predetermined distance to surround the side and the back, and the rod type
  • the first through hole has a structure through which the conductor to be measured can be passed adjacent to the Rogowski coil section of the second substrate, and the second substrate is spaced apart from the second PCB area and the second PCB area by a predetermined distance.
  • a second shield having a structure surrounding the rear surface, and a second through structure having a structure corresponding to the first through hole.
  • the first PCB region may include a circuit element portion to which the circuit elements are coupled, a ground impedance matching portion connected to the circuit element portion, and a rod-type Rogowski coil slice.
  • the circuit element portion may be disposed adjacent to an outer side of the first shield.
  • the rod-type Rogowski coil segment may be a wound inductor in which a coil is wound around the core core.
  • the core core may further include a core having a high permeability therein.
  • the first through hole may have a rectangular, polygonal, or circular structure through which a conductor through which current flows.
  • the second substrate has a size corresponding to the horizontal and vertical lengths of the first substrate, so that when the inner surface of the second substrate and the inner surface of the first substrate overlap each other, the second shield is connected to the first shield. It may be made of a structure that is mechanically or electrically coupled.
  • the second PCB region may include a housing region having a step thickness of a predetermined thickness so as to cover a circuit element portion, a ground impedance matching portion, and a rod-type Rogowski coil section in the first PCB region.
  • the first through holes and the second through holes may have a structure in which a lower end thereof is opened.
  • the first through hole and the second through hole may have a structure in which a lower end thereof is openable.
  • the first through holes and the second through holes may have a conductor in the form of a terminal through which an electric current may flow.
  • the rod-type Rogowski coil fragments may be arranged in plural.
  • the first shield and the second shield may be formed of a conductive material, and may have a Faraday cage structure in which a plurality of grooves are formed in a lattice form on a rear surface thereof.
  • the surface of the first shield and the second shield may comprise copper or tin plating.
  • a predetermined distance may be formed between the first PCB area and the first shield, and a predetermined distance may be formed between the second PCB area and the second shield.
  • the Rogowski coil current sensor may further include a display unit configured to display the measured current value so as to be externally recognized.
  • the Rogowski coil current sensor may further include a blocking unit capable of blocking a current flowing through a conductor positioned in the first and second holes when the measured current value exceeds a reference value.
  • the Rogowski coil current sensor may further include an internal power supply for supplying power.
  • the Rogowski coil current sensor may further include a power calculation unit connected to a built-in voltage sensor or an external voltage sensor to calculate power.
  • the Rogowski coil current sensor may further include a communication unit capable of transmitting the measured current value to another electronic device using wired or wireless communication.
  • the Rogowski coil current sensor is a shape and position of the rod-shaped Rogowski coil section 116, the shape of the conductor located in the first and second through holes, the value of the current flowing through the conductor, and the It may further include a passive filter or an active filter for adjusting the factor due to the frequency.
  • the Rogowski coil current sensor may include a plurality of first and second substrates coupled in a horizontal or vertical direction so that current can be measured simultaneously when there are a plurality of conductors for measuring current. Can be.
  • the Rogowski coil current sensor by using a rod-type Rogowski coil segment, a relatively large number of windings are formed in the core core compared to the PCB coil, so that low current measurement can be performed at a low value.
  • the shield of Faraday cage structure there is an effect that can simultaneously improve the effect of electromagnetic shielding at low cost.
  • FIG. 1 is a view schematically showing the principle of measuring the current in a conventional Rogowski current sensor
  • FIG. 2 is a block diagram showing a component surface of a Rogowski coil current sensor according to an embodiment of the present invention
  • FIG. 3 is a view showing the arrangement of the rod-type Rogowski coil slice in the Rogowski coil current sensor according to an embodiment of the present invention
  • FIG. 4 is an exploded perspective view of parts of a Rogowski coil current sensor according to an embodiment of the present invention.
  • FIG. 5 is a rear separated perspective view of the Rogowski coil current sensor according to an embodiment of the present invention.
  • FIG. 6 is a view showing the separation state of the outer shield and the circuit surface in the component surface of the Rogowski coil current sensor according to an embodiment of the present invention
  • FIG. 7 is a circuit diagram illustrating a ground impedance matching unit in a Rogowski coil current sensor according to an embodiment of the present invention
  • FIG. 8 is a perspective view of a Rogowski coil current sensor according to an embodiment of the present invention, in which a first substrate and a second substrate are coupled to each other.
  • FIG. 2 is a block diagram illustrating a component surface of a Rogowski coil current sensor according to an exemplary embodiment of the present invention.
  • the Rogowski coil current sensor of the present invention has a structure in which a rod-type Rogowski coil fragment and a first substrate 100 on which circuit elements are mounted, and a rod-type Rogowski coil fragment and a circuit element are covered.
  • the second substrate 200 may be formed.
  • the first substrate 100 is composed of a first shield 120 having a structure surrounding the side and the rear surface by being spaced apart from the first PCB region 110 and the first PCB region 110 by a predetermined distance.
  • the first PCB region 110 passes through a circuit element section 112 to which circuit elements are coupled, a ground impedance matching section 114, a rod-type Rogowski coil section 116, and a conductor to be subjected to current measurement. It may be made of a first through hole 118 of a structure that can be.
  • circuit element section 112 the ground impedance matching section 114, and the Rogowski coil segment 116 of the bar type are described in a separate form, the ground impedance matching unit 114 and the Rogsky coil of the bar type are described. Since the intercept 116 may also correspond to a circuit element, it may be represented by the circuit element unit 112 including all of them.
  • the circuit element unit 112 is a portion in which various circuit elements used for current measurement in the first PCB region 110 are combined. This could be a combination of various circuit elements such as integrated chips (ICs), capacitors, inductors, or resistors.
  • the Rogowski coil slice 116 of the rod type corresponds to a component for directly sensing a magnetic field caused by the current flowing in the conductor, but the circuit element 112 except for this is the current of the current using the sensed magnetic field Since it corresponds to a component for measuring the size, it may be disposed to be located outside the first substrate 100.
  • the ground impedance matching unit 114 is for preventing signal attenuation of the first PCB region 110. Since the signal attenuation may occur due to the shielding structure of the first shield 120, an appropriate impedance is maintained. It serves to prevent attenuation of the signal.
  • the rod-type Rogowski coil segment 116 is used as a wound inductor in which a coil is wound around the core core.
  • the inductor coil is not constituted by the PCB structure and adopts the winding type structure in which the coil is wound around the rod-type core core, a larger number of windings can be formed in the core core than the PCB coil. As a result, low value low current measurement is also possible.
  • the core core may improve the sensitivity of the current measurement by inserting a core having a high permeability into the core core.
  • the first through hole 118 may be formed in a polygonal structure, such as a square, or a circular structure so that the conductor through which current flows.
  • the conductor is preferably arranged to pass through the center point of the first through hole 118 for accurate current measurement, the conductor may pass through to be close to one side in the first through hole 118. That is, in the case of the conventional circular Rogowski coil, it is required to place the conductor at the center point, but since the Rogowski coil current sensor of the present invention uses the rod-type Rogowski coil section 116, the first through hole 118 Even if the conductors are arranged at various positions in the first through hole 118 in addition to the center point of FIG. 1, the electric current flowing through the conductors can be measured.
  • the second substrate 200 is formed of a second shield 220 having a structure surrounding the side and the rear surface by being spaced apart from the second PCB region 210 and the second PCB region 210 by a predetermined distance.
  • the second substrate 200 has the same size as the horizontal and vertical lengths of the first substrate 100, so that when the inner surface of the second substrate 200 and the inner surface of the first substrate 100 overlap each other, the second shield 220 may be mechanically or electrically coupled to the first shield 120 such that circuit elements in the first substrate 100 may be shielded by the first shield 120 and the second shield 220.
  • the second PCB area 210 is an area located in the second shield 220 and corresponds to the first PCB area 110.
  • the circuit elements used in the current sensor of the present invention are preferably disposed in the first PCB region 110, some circuit elements may be disposed in the second PCB region 210 as necessary in terms of circuit design.
  • the second PCB region 210 may be of a predetermined thickness so as to cover the circuit element portion 112, the ground impedance matching portion 114, and the rod-type Rogowski coil segment 116 in the first PCB region 110. It may include a housing area 212 having a step. The housing region 212 is in contact with the circuit element portion 112 constituting the first PCB region 110, the ground impedance matching portion 114, and the rod-shaped Rogowski coil segment 116 so that no electrical interference occurs. It is desirable to have a step.
  • a second through hole 218 may be formed in the second PCB area 210 to correspond to the first through hole 118 of the first PCB area 110. Therefore, when the first substrate 100 and the second substrate 200 are coupled to each other, a conductor through which current flows may pass through the first through hole 118 and the second through hole 218.
  • first through hole 118 and the second through hole 218 may open the lower end.
  • the conductor through which current flows is located near the first through 118 and the second through hole 218. By proximity, current measurements can be made.
  • the lower ends of the first through holes 118 and the second through holes 218 may be configured to be opened and closed.
  • the Rogowski coil current sensor of the present invention may further include a display unit formed of a display element to externally recognize the measured current value.
  • when the measured current value exceeds the reference value may further include a blocking unit for blocking the current flowing in the conductor located in the first through hole 118 and the second through hole 218.
  • the Rogowski coil sensor of the present invention may have a built-in internal power source to enable current measurement and display when there is no external power source.
  • the Rogowski coil current sensor of the present invention may further include a power calculation unit that calculates power such as active power or reactive power by embedding a voltage sensor or connecting the voltage sensor. The measured current value or power value may be transmitted to another electronic device using wired communication or wireless communication.
  • a passive filter for correcting or adjusting elements due to the shape and position of the rod-shaped Rogowski coil section 116, the shape of the conductor, the value of the current flowing through the conductor, and the frequency of the current, or It may further include an active filter.
  • FIG 3 is a view showing the arrangement of the rod-type Rogowski coil slice in the Rogowski coil current sensor according to an embodiment of the present invention.
  • the Rogowski coil current sensor of the present invention uses a rod-type Rogowski coil piece 116 as a wound inductor in the first substrate 100.
  • the Rogowski coil 300 is wound around the flexible core core and bent in a circular shape to place a conductor in which the current flows inside the circle, since the Rogowski coil 300 is bent in a circular shape. It is difficult to form a shield for electromagnetic shielding and the cost becomes high.
  • a circular Rogowski coil 300 is not used, but a rod-type Rogowski coil fragment 116 having the same structure as the Rogowski coil 300 and having a rod-shaped core core disposed therein and wound around it with a coil. )
  • the winding type inductor winding the coil in the air core core can make more windings than the PCB coil and enables low current measurement.
  • only one rod-type Rogowski coil piece 116 may be disposed, or a plurality of Rogowski coil pieces 116 may be disposed to improve the sensitivity of the current measurement.
  • the signal due to electromagnetic noise may be mutually compensated, thereby improving current measurement sensitivity.
  • FIG. 4 is an exploded perspective view of parts of a Rogowski coil current sensor according to an exemplary embodiment of the present invention.
  • capacitors C1, C2, C3, and C4 and one IC U1 are disposed in the first PCB region 110 of the first substrate 100, and the rod-type Rogowski coil is formed. It can be seen that the section 116 is located. The ground impedance matching unit 114 is not exposed to the outside. These circuit elements are disposed to cover the housing region 212 in the second PCB region 210 when the second substrate 200 overlaps the first substrate 100. Therefore, even when the first substrate 100 and the second substrate 200 are sealed in an overlapped state, the circuit elements of the first substrate 100 do not come into contact with the second substrate 200 or cause electrical interference. Shielding will be achieved.
  • FIG. 5 is a rear separated perspective view of a Rogowski coil current sensor according to an exemplary embodiment of the present invention.
  • the Rogowski coil current sensor of the present invention forms a first shield 120 for blocking electromagnetic waves on the side and the back of the first substrate 100, and the side and the back of the second substrate 200.
  • the second shield 220 for blocking electromagnetic waves is formed in each.
  • the first shield 120 and the second shield 220 are formed such that the first through holes 118 and the second through holes 218 where the conductors are disposed are opened.
  • the first shield 120 and the second shield 220 may be formed of a conductive material such as metal, but may form a Faraday cage in which a plurality of grooves 122 and 222 are formed in a lattice form on a rear surface thereof. .
  • copper or tin plating may be formed on surfaces of the conductive materials constituting the first shield 120 and the second shield 220.
  • Faraday cage structure may be formed in various shapes such as hexagonal honeycomb, rectangular grid, circular grid.
  • FIG. 6 is a view showing the separation state of the outer shield and the circuit surface in the component surface of the Rogowski coil current sensor according to an embodiment of the present invention.
  • the Rogowski coil current sensor of the present invention has a predetermined distance between the first PCB region 110 and the first shield 120 with respect to the first substrate 100 and the second substrate 200, respectively.
  • the separation space of (d) may be formed, and the separation space of a predetermined distance may be formed between the second PCB region 220 and the second shield 220. This separation space may occur in the first PCB region 110 or the second PCB region 210, or the first shield 120 or the second shield 220 in the situation where the Rogowski coil current sensor of the present invention is moved. This is to reduce the effect of Eddy Current.
  • the separation space may have a separation distance of about 0.1 mm.
  • FIG. 7 is a circuit diagram illustrating a ground impedance matching unit in a Rogowski coil current sensor according to an exemplary embodiment of the present invention.
  • the Rogowski coil current sensor of the present invention may further include a ground impedance matching unit 114.
  • the ground impedance matching unit 114 may include a signal of the signal by the shielding structure of the first shield 120. Since attenuation can occur, it maintains an appropriate impedance to prevent attenuation of the signal.
  • the ground impedance matching unit 114 may block the attenuation of the signal, and may have an effect of minimizing the influence of eddy currents caused by the Faraday cages of the first shield 120 and the second shield 220.
  • the ground impedance matching unit 114 may be represented by an equivalent circuit composed of an inductor and a capacitor.
  • the power source VC and the neutral line NEU are connected to the circuit element unit 112 through the inductor, respectively.
  • One or two capacitors may be connected in parallel between the VC and the neutral line NEU.
  • This equivalent circuit may be adjusted to ground, open, short, or a specific impedance value depending on factors such as Rogowski coil current sensor's operating environment, shape, frequency, and the like.
  • FIG. 8 is a perspective view of a Rogowski coil current sensor according to an embodiment of the present invention, in which a first substrate and a second substrate are coupled to each other.
  • the Rogowski coil current sensor of the present invention combines the first substrate 100 and the second substrate 200 as shown in the figure to block the Rogowski coil fragments and circuit elements therein from external electromagnetic waves. It is also possible to measure low currents.
  • a plurality of Rogowski coil current sensors may be formed in a combined structure in the horizontal or vertical direction.
  • first substrate 110 first PCB region
  • circuit element portion 114 ground impedance matching portion
  • housing area 218 second aperture

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

La présente invention concerne un capteur de courant et, plus spécifiquement, un capteur de courant à bobine de Rogowski comportant une structure de blindage capable de mesurer un courant faible et de réduire au minimum l'impact du bruit électromagnétique. Dans le capteur de courant à bobine de Rogowski selon un mode de réalisation de la présente invention, une section de bobine de Rogowski de type barre est utilisée pour former un nombre relativement élevé d'enroulements de bobine, par rapport à des bobines PCB, sur un noyau d'air de façon à mesurer un courant faible d'une valeur faible. En outre, le capteur de courant utilise un blindage d'une structure de cage de Faraday et peut ainsi améliorer un effet de blocage d'une onde électromagnétique à faible coût.
PCT/KR2018/014941 2018-05-09 2018-11-29 Capteur de courant à bobine de rogowski avec structure de blindage WO2019216511A1 (fr)

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KR1020180052842A KR101939569B1 (ko) 2018-05-09 2018-05-09 차폐 구조를 가지는 로고스키 코일 전류 센서
KR10-2018-0052842 2018-05-09

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CN113848369A (zh) * 2021-09-24 2021-12-28 华北电力大学 带有折线形气隙通道的罗氏线圈型电流传感器

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KR102013286B1 (ko) 2019-03-15 2019-08-22 (주)인피니어 전류 감지 장치

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