GB2621421A - Low-cost high-frequency current signal sensor - Google Patents

Low-cost high-frequency current signal sensor Download PDF

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Publication number
GB2621421A
GB2621421A GB2300700.8A GB202300700A GB2621421A GB 2621421 A GB2621421 A GB 2621421A GB 202300700 A GB202300700 A GB 202300700A GB 2621421 A GB2621421 A GB 2621421A
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United Kingdom
Prior art keywords
magnetic core
coil
sensing coil
frequency
notch
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GB2300700.8A
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GB202300700D0 (en
Inventor
Ma Qing
Wu Hao
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Shangdong University
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Shangdong University
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Publication of GB2621421A publication Critical patent/GB2621421A/en
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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
    • G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/186—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using current transformers with a core consisting of two or more parts, e.g. clamp-on type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • H01F2038/305—Constructions with toroidal magnetic core

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

Abstract

A high-frequency current sensor includes an annular magnetic core 1 with a notch or gap for surrounding a measured line 3. A sensing coil 2 is arranged at the notch position of the core, and magnetic lines of force pass through a space enclosed by the sensing coil wholly or partly. The two ends of the sensing coil are connected in parallel with a resonant capacitor, and an intensity of the high-frequency current flowing in the line is determined according to an output signal from the LC circuit so formed. The coil may be in the air gap of the magnetic core (figure 2) or wound on the magnetic core at the air gap (figure 4). The core may be a two-part split core and may be rectangular or circular, and is made from high frequency, low hysteresis material. The sensor is suitable for detecting fault currents of 3 MHz to 30 MHz.

Description

LOW-COST HIGH-FREQUENCY CURRENT SIGNAL SENSOR
TECHNICAL FIELD
The present disclosure relates to the technical field of high-frequency current signal sensors, and more particularly to a low-cost high-frequency current signal sensor.
BACKGROUND
The description in this part merely provides the background technology related to the present disclosure, but does not necessarily constitute the prior art.
Current signals or high-frequency signals (generally within the range of 3 MHZ to 30 MHZ) are basically used as detection standard for AC line faults, and the acquisition of high-frequency signals depends on a high-frequency current transformer or Roche coil.
The inventors found that the high-frequency current transformer requires the use of high-frequency low-hysteresis materials and the range of output frequency needs to be customized or a rear frequency selection circuit is used. The manufacturing precision of the Roche coil is higher, the manufacturing cost is high, and the rear frequency selection circuit is also needed.
Chinese patent CN201911109810.X has disclosed a current transformer with wide-frequency and wide-amplitude measurement and anti-magnetic interference capability, which is provided with a Hall element in an air gap. As the frequency domain of the Hall element for sensing signals is limited by parameters of the element, the frequency domain is restricted to a small region (generally less than 1 MHZ), and cannot be used for detecting high-frequency signals for fault detection.
SUMMARY
In order to solve the deficiencies in the prior art, the present disclosure provides a low-cost high-frequency current signal sensor, which uses a magnetic core with an air gap, has low requirements on magnetic core materials, can obtain good frequency characteristics, has a wide acquisition frequency range, and can realize acquisition of high-frequency current signals. A coil is arranged at the air gap of the magnetic core or wound on the magnetic core with the air gap. Good frequency selection characteristics can be obtained through a resistant design, a rear frequency selection circuit is eliminated, and the cost is significantly reduced.
To achieve the foregoing objective, the present disclosure adopts the following technical solutions.
A first aspect of the present disclosure provides a low-cost high-frequency current signal sensor.
The low-cost high-frequency current signal sensor includes: an annular magnetic core with a notch and used for surrounding a measured line, a sensing coil is arranged at the notch position of the annular magnetic core, and a magnetic line of force is enabled to pass through a space enclosed by the sensing coil wholly or partly; and two ends of the sensing coil are connected in parallel with a resonant capacitor, and an intensity of the high-frequency current signal is determined according to a proportional relationship between an output signal and the current high-frequency signal intensity.
It is to be understood that the annular magnetic core can be round and square, or may be other shapes, such as ellipse, rectangle, pentagon, hexagon, etc. As an optional implementation, the sensing coil arranged at the notch position of the annular magnetic core is an on-board coil.
As an optional implementation, an inductance value / of the sensing coil is: 1=0.01DA12/(L/D+0.44); N is the number of turns of the coil, D is a diameter of the coil, and L is a total length of the coil.
As an optional implementation, the annular magnetic core is a circular magnetic core with a notch.
As an optional implementation, the annular magnetic core is a square or rectangular annular magnetic core with a notch.
As an optional implementation, the annular magnetic core is a split-core annular magnetic core with a notch, including a first magnetic core and a second magnetic core. A first end of the first magnetic core and a first end of the second magnetic core are movably connected, and the notch is located between a second end of the first magnetic core and a second end of the second magnetic core.
A second aspect of the present disclosure provides a low-cost high-frequency current signal sensor.
The low-cost high-frequency current signal sensor includes an annular magnetic core with a notch and used for surrounding a measured line, a sensing coil is arranged around the notch position of the annular magnetic core, and a magnetic line of force is enabled to pass through a space enclosed by the sensing coil wholly; and two ends of the sensing coil are connected in parallel with a resonant capacitor, and an intensity of the high-frequency current signal is determined according to a proportional relationship between an output signal and the current high-frequency signal intensity.
As an optional implementation, the inductance value / of the sensing coil is/=0.01DN2/(L/D+0.44); Nis the number of turns of the coil, and D is a diameter of the coil.
As an optional implementation, the annular magnetic core is a circular magnetic core with a notch; or the annular magnetic core is a square or rectangular annular magnetic core with a notch.
As an optional implementation, the annular magnetic core is a split-core annular magnetic core with a notch, including a first magnetic core and a second magnetic core. A first end of the first magnetic core and a first end of the second magnetic core are movably connected, and the notch is located between a second end of the first magnetic core and a second end of the second magnetic core.
Compared with the prior art, the present disclosure has the following beneficial effects.
1. The low-cost high-frequency current signal sensor described in the present disclosure uses the magnetic core with an air gap, has low requirements on magnetic core materials, can obtain good frequency characteristics, has a wide acquisition frequency range, and can realize acquisition of high-frequency current signals.
2. According to the low-cost high-frequency current signal sensor described in the present disclosure, the coil is arranged at the air gap of the magnetic core or wound on the magnetic core with the air gap, good frequency selection characteristics can be obtained through a resistant design, a rear frequency selection circuit is eliminated, and the cost is significantly reduced.
Advantages of additional aspects of the present disclosure will be set forth in part in the description below, parts of which will become apparent from the description below, or will be understood by the practice of the present disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The exemplary embodiments of the present disclosure and descriptions thereof are used to explain the present disclosure, and do not constitute an improper limitation of the present disclosure.
FIG.1 is a schematic diagram of a low-cost high-frequency current signal sensor provided by an embodiment of the present disclosure.
FIG.2 is a schematic diagram 1 of positions of a magnetic core and a sensing coil provided by Embodiment 1 of the present disclosure.
FIG 3 is a schematic diagram II of the positions of the magnetic core and the sensing coil provided by Embodiment 1 of the present disclosure.
FIG. 4 is a schematic diagram I of positions of a magnetic core and a sensing coil provided by Embodiment 2 of the present disclosure.
FIG 5 is a schematic diagram II of the positions of the magnetic core and the sensing coil provided by Embodiment 2 of the present disclosure.
FIG. 6 is a schematic diagram I of positions of a magnetic core and a sensing coil provided by Embodiment 3 of the present disclosure.
FIG 7 is a schematic diagram II of the positions of the magnetic core and the sensing coil provided by Embodiment 3 of the present disclosure.
FIG. 8 is a schematic diagram III of the positions of the magnetic core and the sensing coil provided by Embodiment 3 of the present disclosure.
FIG. 9 is a schematic diagram I of positions of a magnetic core and a sensing coil provided by Embodiment 4 of the present disclosure.
FIG 10 is a schematic diagram II of the positions of the magnetic core and the sensing coil provided by Embodiment 4 of the present disclosure.
FIG. 11 is a schematic diagram III of the positions of the magnetic core and the sensing coil provided by Embodiment 4 of the present disclosure.
FIG. 12 is a schematic diagram of positions of a magnetic core and a sensing coil provided by Embodiment 5 of the present disclosure FIG. 13 is a schematic diagram of positions of a magnetic core and a sensing coil provided by Embodiment 6 of the present disclosure.
FIG. 14 is a schematic diagram of positions of a magnetic core and a sensing coil provided by Embodiment 7 of the present disclosure.
FIG. 15 is a schematic diagram of positions of a magnetic core and a sensing coil provided by Embodiment 8 of the present disclosure.
In the figures, 1-annular magnetic core; 2-sensing coil; and 3-measured line.
DETAILED DESCRIPTION
The present disclosure is further described below with reference to the accompanying drawings and embodiments.
It should be noted that, the following detailed descriptions are all exemplary, and are intended to provide further descriptions of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those usually understood by a person of ordinary skill in the art to which the present disclosure belongs.
It should be noted that the terrns used herein are merely used for describing specific implementations, and are not intended to limit exemplary implementations of the present disclosure. As used herein, the singular form is also intended to include the plural form unless the context clearly dictates otherwise. In addition, it should further be understood that, terms "comprise" and/or "include" used in this specification indicate that there are features, steps, operations, devices, components, and/or combinations thereof The embodiments in the present disclosure and features in the embodiments may be mutually combined in case that no conflict occurs.
Embodiment I: As shown in FIG. 1, FIG. 2 and FIG 3, Embodiment 1 of the present disclosure provides a low-cost high-frequency current signal sensor, which includes: an annular magnetic core 1 with a notch and used for surrounding a measured line 3. A sensing coil 2 is arranged at the notch position of the annular magnetic core, and a magnetic line of force is enabled to pass through a space enclosed by the sensing coil 2 wholly or partly Two ends of the sensing coil 2 are connected in parallel with a resonant capacitor, and an intensity of the high-frequency current signal is determined according to a proportional relationship between an output signal and the current high-frequency signal intensity.
In this embodiment, the sensing coil 2 may adopt a PCB on-board coil, an enameled wire or other structures, and an equivalent inductance of the sensing coil 2 is calculated through a magnetic permeability of the magnetic core and an air gap width (an opening width of the magnetic core). The two ends of the sensing coil 2 are connected in parallel with the resonant capacitor for optimizing the frequency selection quality. The output signal only includes a high-frequency part. When spatial positions of the magnetic core and the sensing coil are relatively fixed, the output signal is proportional to a high-frequency component of the current, and a ratio is fixed.
An equivalent circuit is an LC resonant circuit, according to a resonant frequency calculation formula: f -f is frequency (unit: Hz); n-is the ratio of circumference to diameter; L is the equivalent inductance of the coil (unit: H) and ('is a capacitance value of the resonant capacitor (unit: F).
In this embodiment, frequency selection characteristics of the circuit can be adjusted directly by adjusting values of Li and Cl, as shown in FIG. 1 In this embodiment, the sensing coil arranged at the notch position of the annular magnetic core is an on-board coil.
An inductance value / of the sensing coil is: /=0.0 IDN2/(L/D+0.44); N is the number of turns of the coil, D is a diameter of the coil, and Lisa total length of the coil.
In this embodiment, the annular magnetic core is a circular magnetic core with a notch. Embodiment 2: As shown in FIG. I, FIG. 4 and FIG. 5, Embodiment 2 of the present disclosure provides a low-cost high-frequency current signal sensor, which includes: an annular magnetic core 1 with a notch and used for surrounding a measured line 3. A sensing coil 2 is arranged around the annular magnetic core I, and a magnetic line of force is enabled to pass through a space enclosed by the sensing coil wholly.
Two ends of the sensing coil 2 are connected in parallel with a resonant capacitor, and an intensity of the high-frequency current signal is determined according to a proportional relationship between an output signal and the current high-frequency signal intensity.
In this embodiment, the sensing coil 2 may adopt a PCB on-board coil, an enameled wire or other structures, and an equivalent inductance of the sensing coil 2 is calculated through a magnetic permeability of the magnetic core and an air gap width (an opening width of the magnetic core). The two ends of the sensing coil 2 are connected in parallel with the resonant capacitor for optimizing the frequency selection quality. The output signal only includes a high-frequency part. When spatial positions of the magnetic core and the sensing coil are relatively fixed, the output signal is proportional to a high-frequency component of the current, and a ratio is fixed.
An equivalent circuit is an LC esonant circuit, according to a resonant frequency calculation formula: 27r,s /nC/1 f is frequency (unit: Hz); 7E is the ratio of circumference to diameter; L is the equivalent inductance of the coil (unit: H); and C is a capacitance value of the resonant capacitor (unit: F) In this embodiment, frequency selection characteristics of the circuit can be adjusted directly by adjusting values of Li and Cl, as shown in FIG. I. In this embodiment, an inductance value / of the sensing coil is: /=0.01DN2/(L/D+0.44); N is the number of turns of the coil, 1) is a diameter of the coil, and L is a total length of the coil.
In this embodiment, the annular magnetic core is a circular magnetic core with a notch. Embodiment 3: As shown in FIG. I, FIG. 6, FIG. 7 and FIG. 8, Embodiment 3 of the present disclosure provides a low-cost high-frequency current signal sensor, which includes: an annular magnetic core 1 with a notch and used for surrounding a measured line 3. A sensing coil 2 is arranged at the notch position of the annular magnetic core, and a magnetic line of force is enabled to pass through a space enclosed by the sensing coil 2 wholly or partly.
Two ends of the sensing coil 2 are connected in parallel with a resonant capacitor, and an intensity of the high-frequency current signal is determined according to a proportional relationship between an output signal and the current high-frequency signal intensity.
In this embodiment, the sensing coil 2 may adopt a PCB on-board coil, an enameled wire or other structures, and an equivalent inductance of the sensing coil 2 is calculated through a magnetic permeability of the magnetic core and an air gap width (an opening width of the magnetic core). The two ends of the sensing coil 2 are connected in parallel with the resonant capacitor for optimizing the frequency selection quality. The output signal only includes a high-frequency part. When spatial positions of the magnetic core and the sensing coil are relatively fixed, the output signal is proportional to a high-frequency component of the current, and a ratio is fixed.
An equivalent circuit is an LC resonant circuit, according to a resonant frequency calculation formula: 27r,, ni: [is frequency (unit: Hz); 7 is the ratio of circumference to diameter; L is the equivalent inductance of the coil (unit: H), and C is a capacitance value of the resonant capacitor (unit: F).
In this embodiment, frequency selection characteristics of the circuit can be adjusted directly by adjusting values of Ll and Cl, as shown in FIG. 1 In this embodiment, the sensing coil arranged at the notch position of the annular f -magnetic core is an on-board coil.
An inductance value / of the sensing coil is: /=0.01DN2/(L/D+0.44), N is the number of turns of the coil, I) is a diameter of the coil, and L is a total length of the coil.
In this embodiment, the annular magnetic core is a split-core circular magnetic core with a notch, including a first magnetic core and a second magnetic core. A first end of the first magnetic core and a first end of the second magnetic core are movably connected, and the notch is located between a second end of the first magnetic core and a second end of the second magnetic core.
Embodiment 4: As shown in FIG. 1, FIG. 9, FIG. 10 and FIG. 11, Embodiment 4 of the present disclosure provides a low-cost high-frequency current signal sensor, which includes: an annular magnetic core 1 with a notch for surrounding a measured line 3. A sensing coil 2 is arranged at the notch position of the annular magnetic core, and a magnetic line of force is enabled to pass through a space enclosed by the sensing coil 2 wholly or partly.
Two ends of the sensing coil 2 are connected in parallel with a resonant capacitor, and an intensity of the high-frequency current signal is determined according to a proportional relationship between an output signal and the current high-frequency signal intensity.
In this embodiment, the sensing coil 2 may adopt a PCB on-board coil, an enameled wire or other structures, and an equivalent inductance of the sensing coil 2 is calculated through a magnetic permeability of the magnetic core and an air gap width (an opening width of the magnetic core). The two ends of the sensing coil 2 are connected in parallel with the resonant capacitor for optimizing the frequency selection quality. The output signal only includes a high-frequency part. When spatial positions of the magnetic core and the sensing coil are relatively fixed, the output signal is proportional to a high-frequency component of the current, and a ratio is fixed.
An equivalent circuit is an LC resonant circuit, according to a resonant frequency calculation formula: f -f is frequency (unit: Hz); 7r is the ratio of circumference to diameter; L is the equivalent inductance of the coil (unit: H); and C is a capacitance value of the resonant capacitor (unit: F).
In this embodiment, frequency selection characteristics of the circuit can be adjusted directly by adjusting values of Ll and Cl, as shown in FIG. 1 In this embodiment, the sensing coil arranged at the notch position of the annular magnetic core is an on-board coil.
An inductance value / of the sensing coil is: /=0.01DN2/(L/D+0.44); N is the number of turns of the coil, D is a diameter of the coil, and Lisa total length of the coil.
In this embodiment, the annular magnetic core is a split-core or rectangular annular magnetic core with a notch, including a first magnetic core and a second magnetic core. A first end of the first magnetic core and a first end of the second magnetic core are movably connected, and the notch is located between a second end of the first magnetic core and a second end of the second magnetic core.
Embodiment 5: As shown in FIG. 1 and FIG. 12, Embodiment 5 of the present disclosure provides a low-cost high-frequency current signal sensor, which includes: an annular magnetic core 1 with a notch and used for surrounding a measured line 3. A sensing coil 2 is arranged at the notch position of the annular magnetic core, and a magnetic line of force is enabled to pass through a space enclosed by the sensing coil 2 wholly or partly.
Two ends of the sensing coil 2 are connected in parallel with a resonant capacitor, and an intensity of the high-frequency current signal is determined according to a proportional relationship between an output signal and the current high-frequency signal intensity.
In this embodiment, the sensing coil 2 may adopt a PCB on-board coil, an enameled wire or other structures, and an equivalent inductance of the sensing coil 2 is calculated through a magnetic permeability of the magnetic core and an air gap width (an opening width of the magnetic core). The two ends of the sensing coil 2 are connected in parallel with the resonant capacitor for optimizing the frequency selection quality. The output signal only includes a high-frequency part. When spatial positions of the magnetic core and the sensing coil are relatively fixed, the output signal is proportional to a high-frequency component of the current, and a ratio is fixed.
An equivalent circuit is an LC resonant circuit, according to a resonant frequency calculation formula: f 22z-N f is frequency (unit: Hz); 7 is the ratio of circumference to diameter; L is the equivalent inductance of the coil (unit: H); and C is a capacitance value of the resonant capacitor (unit: F) In this embodiment, frequency selection characteristics of the circuit can be adjusted directly by adjusting values of Li and Cl, as shown in FIG. 1.
In this embodiment, the sensing coil arranged at the notch position of the annular magnetic core is an on-board coil.
An inductance value I of the sensing coil is: fr0.01DN2/(L/D+0.44); N is the number of turns of the coil,!) is a diameter of the coil, and!. is a total length of the coil.
In this embodiment, the annular magnetic core is a square or rectangular annular magnetic core with a notch.
Embodiment 6: As shown in FIG. 1 and FIG. 13, Embodiment 6 of the present disclosure provides a low-cost high-frequency current signal sensor, which includes: an annular magnetic core I with a notch and used for surrounding a measured line 3. A sensing coil 2 is arranged around the annular magnetic core 1, and a magnetic line of force is enabled to pass through a space enclosed by the sensing coil wholly.
Two ends of the sensing coil 2 are connected in parallel with a resonant capacitor, and an intensity of the high-frequency current signal is determined according to a proportional relationship between an output signal and the current high-frequency signal intensity.
In this embodiment, the sensing coil 2 may adopt a PCB on-board coil, an enameled wire or other structures, and an equivalent inductance of the sensing coil 2 is calculated through a magnetic permeability of the magnetic core and an air gap width (an opening width of the magnetic core). The two ends of the sensing coil 2 are connected in parallel with the resonant capacitor for optimizing the frequency selection quality. The output signal only includes a high-frequency part. When spatial positions of the magnetic core and the sensing coil are relatively fixed, the output signal is proportional to a high-frequency component of the current, and a ratio is fixed.
An equivalent circuit is an LC resonant circuit, according to a resonant frequency calculation formula: 27r,s inC7' f is frequency (unit: Hz); 7E is the ratio of circumference to diameter; L is the equivalent inductance of the coil (unit: H); and C is a capacitance value of the resonant capacitor (unit: F) In this embodiment, frequency selection characteristics of the circuit can be adjusted directly by adjusting values of Li and Cl, as shown in FIG. 1.
In this embodiment, an inductance value / of the sensing coil is: /=0.01DN2/(L/D+0.44); N is the number of turns of the coil, D is a diameter of the coil, and L is a total length of the coil In this embodiment, the annular magnetic core is a split-core or rectangular annular magnetic core with a notch, including a first magnetic core and a second magnetic core. A first end of the first magnetic core and a first end of the second magnetic core are movably connected, and the notch is located between a second end of the first magnetic core and a second end of the second magnetic core.
Embodiment 7: As shown in FIG. 1 and FIG. N, Embodiment 7 of the present disclosure provides a low-cost high-frequency current signal sensor, which includes: an annular magnetic core 1 with a notch and used for surrounding a measured line 3. A sensing coil 2 is arranged around the annular magnetic core 1, and a magnetic line of force is enabled to pass through a space enclosed by the sensing coil wholly.
Two ends of the sensing coil 2 are connected in parallel with a resonant capacitor, and an intensity of the high-frequency current signal is determined according to a proportional relationship between an output signal and the current high-frequency signal intensity.
In this embodiment, the sensing coil 2 may adopt a PCB on-board coil, an enameled wire or other structures, and an equivalent inductance of the sensing coil 2 is calculated through a magnetic permeability of the magnetic core and an air gap width (an opening width of the magnetic core). The two ends of the sensing coil 2 are connected in parallel with the resonant capacitor for optimizing the frequency selection quality. The output signal only includes a high-frequency part. When spatial positions of the magnetic core and the sensing coil are relatively fixed, the output signal is proportional to a high-frequency component of the current, and a ratio is fixed.
An equivalent circuit is an LC resonant circuit, according to a resonant frequency calculation formula: f 22z-N, f is frequency (unit: Hz); 7 is the ratio of circumference to diameter; L is the equivalent inductance of the coil (unit: H); and C is a capacitance value of the resonant capacitor (unit:
II F).
In this embodiment, frequency selection characteristics of the circuit can be adjusted directly by adjusting values of Li and Cl, as shown in FIG. 1.
In this embodiment, an inductance value / of the sensing coil is: /=0.01DA/2/(L/D+0.44); N is the number of turns of the coil, D is a diameter of the coil, and Lisa total length of the coil In this embodiment, the annular magnetic core is a square or rectangular annular magnetic core with a notch.
Embodiment 8: As shown in FIG. 1 and FIG. 15, Embodiment 8 of the present disclosure provides a low-cost high-frequency current signal sensor, which includes: an annular magnetic core 1 with a notch and used for surrounding a measured line 3. A sensing coil 2 is arranged around the annular magnetic core 1, and a magnetic line of force is enabled to pass through a space enclosed by the sensing coil wholly.
Two ends of the sensing coil 2 are connected in parallel with a resonant capacitor, and an intensity of the high-frequency current signal is determined according to a proportional relationship between an output signal and the current high-frequency signal intensity.
In this embodiment, the sensing coil 2 may adopt a PCB on-board coil, an enameled wire or other structures, and an equivalent inductance of the sensing coil 2 is calculated through a magnetic permeability of the magnetic core and an air gap width (an opening width of the magnetic core). The two ends of the sensing coil 2 are connected in parallel with the resonant capacitor for optimizing the frequency selection quality. The output signal only includes a high-frequency part. When spatial positions of the magnetic core and the sensing coil are relatively fixed, the output signal is proportional to a high-frequency component of the current, and a ratio is fixed.
An equivalent circuit is an LC resonant circuit, according to a resonant frequency calculation formula: f -f is frequency (unit: Hz); re is the ratio of circumference to diameter; L is the equivalent inductance of the coil (unit: H); and C is a capacitance value of the resonant capacitor (unit: F) In this embodiment, frequency selection characteristics of the circuit can be adjusted directly by adjusting values of Ll and Cl, as shown in FIG. 1.
In this embodiment, an inductance value / of the sensing coil is: /=0.01DN2/(L/D+0.44); N is the number of turns of the coil, D is a diameter of the coil, and L is a total length of the coil In this embodiment, the annular magnetic core is a circular magnetic core with a notch.
The above descriptions are merely preferred embodiments of the present disclosure and are not intended to limit the present disclosure. A person skilled in the art may make various alterations and variations to the present disclosure. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure shall fall within the protection scope of the present disclosure.

Claims (6)

  2. What is claimed is: 1. A low-cost high-frequency current signal sensor, comprising: an annular magnetic core with a notch and used for surrounding a measured line, wherein a sensing coil is arranged at the notch position of the annular magnetic core, a magnetic line of force is enabled to pass through a space enclosed by the sensing coil wholly or partly, and a high-frequency low-hysteresis material is adopted by the annular magnetic core; two ends of the sensing coil are connected in parallel with a resonant capacitor, an intensity of the high-frequency current signal is determined according to a proportional relationship between an output signal and the current high-frequency signal intensity; an inductance value / of the sensing coil is: 7=0.01 T)N2I(LIT)+0.44); wherein N is the number of turns of the coil, D is a diameter of the coil, and L is a total length of the coil; and the annular magnetic core is a split-core annular magnetic core with a notch, comprising a first magnetic core and a second magnetic core, a first end of the first magnetic core and a first end of the second magnetic core are movably connected, and the notch is located between a second end of the first magnetic core and a second end of the second magnetic core 2. The low-cost high-frequency current signal sensor according to claim 1, wherein: the sensing coil arranged at the notch position of the annular magnetic core is an on-board coil.
  3. 3. The low-cost high-frequency current signal sensor according to claim 1, wherein: the annular magnetic core is a circular magnetic core with a notch.
  4. 4. The low-cost high-frequency current signal sensor according to claim 1, wherein. the annular magnetic core is a square or rectangular annular magnetic core with a notch.
  5. 5. A low-cost high-frequency current signal sensor, comprising: an annular magnetic core with a notch and used for surrounding a measured line, wherein a sensing coil is arranged around the notch position of the annular magnetic core, a magnetic line of force is enabled to pass through a space enclosed by the sensing coil wholly, and a high-frequency low-hysteresis material is adopted by the annular magnetic core; two ends of the sensing coil are connected in parallel with a resonant capacitor, an intensity of the high-frequency current signal is determined according to a proportional relationship between an output signal and the current high-frequency signal intensity; an inductance value / of the sensing coil is: /-0.01D/Y/(L/D+0.44); wherein N is the number of turns of the coil, 1) is a diameter of the coil, and L is a total length of the coil; and the annular magnetic core is a split-core annular magnetic core with a notch, comprising a first magnetic core and a second magnetic core, a first end of the first magnetic core and a first end of the second magnetic core are movably connected, and the notch is located between a second end of the first magnetic core and a second end of the second magnetic core
  6. 6. The low-cost high-frequency current signal sensor according to claim 5, wherein.the annular magnetic core is a circular magnetic core with a notch; or the annular magnetic core is a square or rectangular annular magnetic core with a notch.
GB2300700.8A 2022-08-08 2023-01-17 Low-cost high-frequency current signal sensor Pending GB2621421A (en)

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