CN115020094A - Low-cost high-frequency current signal sensor - Google Patents

Low-cost high-frequency current signal sensor Download PDF

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Publication number
CN115020094A
CN115020094A CN202210941384.1A CN202210941384A CN115020094A CN 115020094 A CN115020094 A CN 115020094A CN 202210941384 A CN202210941384 A CN 202210941384A CN 115020094 A CN115020094 A CN 115020094A
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magnetic core
coil
sensing coil
frequency
current signal
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CN115020094B (en
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马庆
吴皓
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Shandong Youbai Electronic Technology Co ltd
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Shandong University
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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

The invention provides a low-cost high-frequency current signal sensor, and belongs to the technical field of electrical variable measurement. The low-cost high-frequency current signal sensor comprises: the annular magnetic core is provided with a gap and used for surrounding a measured line, and the sensing coil is arranged at the gap position of the annular magnetic core so that the magnetic lines of force completely or partially pass through a space surrounded by the sensing coil; the two ends of the sensing coil are connected with a resonance capacitor in parallel, and the intensity of the high-frequency current signal is determined according to the proportional relation between the output signal and the intensity of the current high-frequency signal; the invention has low requirement on magnetic core materials, can obtain good frequency characteristics, has wide acquisition frequency range, can realize the acquisition of high-frequency current signals, can obtain good frequency selection characteristics by impedance design by arranging the coil at the air gap of the magnetic core or winding the coil on the magnetic core with the air gap, saves a post-positioned frequency selection circuit and greatly reduces the cost.

Description

Low-cost high-frequency current signal sensor
Technical Field
The invention relates to the technical field of high-frequency current signal sensors, in particular to a low-cost high-frequency current signal sensor.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The fault of the alternating current line basically uses a current signal or a high-frequency signal (generally in a range of 3 MHZ-30 MHZ) as a detection basis, wherein the high-frequency signal is collected by depending on a high-frequency current transformer or a Rogowski coil.
The inventor finds that the high-frequency current transformer requires a high-frequency low-hysteresis material, and the output frequency range needs to be customized or a post-frequency selection circuit is used; the Rogowski coil has higher requirement on manufacturing precision and high manufacturing cost, and a rear frequency selection circuit is also needed.
Chinese patent No. cn201911109810.x discloses a current transformer with wide-band, wide-range measurement and anti-magnetic interference capabilities, wherein a hall element is arranged at an air gap, the frequency domain of a hall element sensing signal is limited by the parameters of the element, the frequency domain is limited in a small section (generally less than 1 MHZ), and the detection of a high-frequency signal for fault detection cannot be realized.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides the low-cost high-frequency current signal sensor, the magnetic core with the air gap is used, the requirement on the magnetic core material is low, the good frequency characteristic can be obtained, the acquisition frequency range is wide, the acquisition of the high-frequency current signal can be realized, the coil is arranged at the air gap of the magnetic core or wound on the magnetic core with the air gap, the good frequency selection characteristic can be obtained through impedance design, a post-arranged frequency selection circuit is omitted, and the cost is greatly reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a first aspect of the invention provides a low cost high frequency current signal sensor.
A low cost high frequency current signal sensor comprising: the annular magnetic core is provided with a gap and used for surrounding a measured line, and the sensing coil is arranged at the gap position of the annular magnetic core so that the magnetic lines of force completely or partially pass through a space surrounded by the sensing coil;
and the two ends of the sensing coil are connected with a resonant capacitor in parallel, and the intensity of the high-frequency current signal is determined according to the proportional relation between the output signal and the intensity of the current high-frequency signal.
It will be appreciated that the ring core may be circular and square, but other shapes are possible, such as oval, rectangular, pentagonal, hexagonal, etc.
In an alternative implementation, the sensing coil disposed at the position of the gap of the annular magnetic core is an on-board coil.
As an alternative implementation, the inductance value l of the sensing coil is: l =0.01DN 2/(L/D + 0.44); wherein, N is the coil number of turns, D is the coil diameter, and L is the coil total length.
As an alternative implementation manner, the annular magnetic core is an annular magnetic core with a notch.
As an alternative implementation manner, the annular magnetic core is a square or rectangular annular magnetic core with a notch.
As an optional implementation manner, the annular magnetic core is an open-close type annular magnetic core with a notch, and includes a first magnetic core and a second magnetic core, a first end of the first magnetic core is movably connected with a first end of the second magnetic core, and a notch is formed between a second end of the first magnetic core and a second end of the second magnetic core.
A second aspect of the invention provides a low cost high frequency current signal sensor.
A low cost high frequency current signal sensor comprising: the annular magnetic core is provided with a gap and used for surrounding a measured line, and the sensing coil is arranged on the annular magnetic core in a surrounding manner so that magnetic lines of force all penetrate through a space defined by the sensing coil;
and the two ends of the sensing coil are connected with a resonant capacitor in parallel, and the intensity of the high-frequency current signal is determined according to the proportional relation between the output signal and the intensity of the current high-frequency signal.
As an alternative implementation, the inductance value L of the sensing coil is: l =0.01DN 2/(L/D + 0.44); wherein N is the number of turns of the coil, and D is the diameter of the coil.
As an optional implementation manner, the annular magnetic core is an annular 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 manner, the annular magnetic core is an open-close type annular magnetic core with a notch, and includes a first magnetic core and a second magnetic core, a first end of the first magnetic core is movably connected with a first end of the second magnetic core, and a notch is formed between a second end of the first magnetic core and a second end of the second magnetic core.
Compared with the prior art, the invention has the beneficial effects that:
1. the low-cost high-frequency current signal sensor disclosed by the invention uses the magnetic core with the air gap, has low requirements on the magnetic core material, can obtain good frequency characteristics, has a wide acquisition frequency range, and can realize the acquisition of high-frequency current signals.
2. According to the low-cost high-frequency current signal sensor, 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 impedance design, a rear frequency selection circuit is omitted, and cost is greatly reduced.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic diagram of a low-cost high-frequency current signal sensor according to an embodiment of the present invention.
Fig. 2 is a first schematic diagram illustrating positions of a magnetic core and a sensing coil according to embodiment 1 of the present invention.
Fig. 3 is a schematic diagram illustrating a position of a magnetic core and a sensing coil according to embodiment 1 of the present invention.
Fig. 4 is a first schematic diagram illustrating positions of a magnetic core and a sensing coil according to embodiment 2 of the present invention.
Fig. 5 is a schematic diagram illustrating a position of a magnetic core and a sensing coil according to embodiment 2 of the present invention.
Fig. 6 is a first schematic diagram illustrating positions of a magnetic core and a sensing coil according to embodiment 3 of the present invention.
Fig. 7 is a schematic diagram illustrating positions of a magnetic core and a sensing coil according to embodiment 3 of the present invention.
Fig. 8 is a third schematic diagram illustrating the positions of the magnetic core and the sensing coil according to embodiment 3 of the present invention.
Fig. 9 is a first schematic diagram illustrating positions of a magnetic core and a sensing coil according to embodiment 4 of the present invention.
Fig. 10 is a schematic diagram illustrating a position of a magnetic core and a position of a sensing coil according to embodiment 4 of the present invention.
Fig. 11 is a third schematic diagram illustrating the positions of the magnetic core and the sensing coil according to embodiment 4 of the present invention.
Fig. 12 is a schematic diagram of the positions of the magnetic core and the sensing coil provided in embodiment 5 of the present invention.
Fig. 13 is a schematic diagram of the positions of the magnetic core and the sensing coil provided in embodiment 6 of the present invention.
Fig. 14 is a schematic diagram of the positions of the magnetic core and the sensing coil provided in embodiment 7 of the present invention.
Fig. 15 is a schematic diagram of the positions of the magnetic core and the sensing coil according to embodiment 8 of the present invention.
Wherein, 1-ring-shaped magnetic core; 2-a sensing coil; 3-line under test.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1:
as shown in fig. 1, 2, and 3, embodiment 1 of the present invention provides a low-cost high-frequency current signal sensor, including: the circuit comprises an annular magnetic core 1 with a gap and used for surrounding a measured circuit 3, and a sensing coil 2 is arranged at the gap position of the annular magnetic core, so that magnetic lines of force completely or partially pass through a space surrounded by the sensing coil 2;
and the two ends of the sensing coil 2 are connected with a resonant capacitor in parallel, and the intensity of the high-frequency current signal is determined according to the proportional relation between the output signal and the intensity of the current high-frequency signal.
In this embodiment, the sensing coil 2 may use a structure such as an on-board coil of a PCB or an enameled wire, and the equivalent inductance of the sensing coil 2 is calculated through the magnetic permeability and the air gap width (the opening width of the magnetic core), two ends of the sensing coil 2 are connected in parallel with a resonant capacitor for optimizing the frequency selection quality, the output signal only includes a high-frequency part, and when the spatial positions of the magnetic core and the sensing coil are relatively fixed, the output signal is proportional to the high-frequency component of the current, and the ratio is fixed.
The equivalent circuit is an LC resonance circuit, and according to a resonance frequency calculation formula:
Figure DEST_PATH_IMAGE001
wherein f is frequency (unit: Hz); pi is the circumference ratio; l is the equivalent inductance (unit: H) of the coil; c is the capacitance (unit: F) of the resonance capacitor.
In this embodiment, as shown in fig. 1, the frequency-selecting characteristic of the circuit can be adjusted by directly adjusting the values of L1 and C1.
In this embodiment, the sensing coil provided at the notch position of the annular magnetic core is an on-board coil.
The inductance value l of the sensing coil is: l =0.01DN 2/(L/D + 0.44); wherein N is the coil turns, D is the coil diameter, and L is the coil total length.
In this embodiment, the annular magnetic core is an annular magnetic core with a notch.
Example 2:
as shown in fig. 1, 4 and 5, embodiment 2 of the present invention provides a low-cost high-frequency current signal sensor, including: the annular magnetic core 1 is provided with a gap and used for surrounding a measured line 3, and the sensing coil 2 is arranged on the annular magnetic core 1 in a surrounding manner so that magnetic lines of force all penetrate through a space surrounded by the sensing coil;
the two ends of the sensing coil 2 are connected in parallel with a resonant capacitor, and the intensity of the high-frequency current signal is determined according to the proportional relation between the output signal and the intensity of the current high-frequency signal.
In this embodiment, the sensing coil 2 may use a structure such as an on-board coil of a PCB or an enameled wire, and the equivalent inductance of the sensing coil 2 is calculated through the magnetic permeability and the air gap width (the opening width of the magnetic core), two ends of the sensing coil 2 are connected in parallel with a resonant capacitor for optimizing the frequency selection quality, the output signal only includes a high-frequency part, and when the spatial positions of the magnetic core and the sensing coil are relatively fixed, the output signal is proportional to the high-frequency component of the current, and the ratio is fixed.
The equivalent circuit is an LC resonance circuit, and according to a resonance frequency calculation formula:
Figure 98340DEST_PATH_IMAGE001
wherein f is frequency (unit: Hz); pi is the circumference ratio; l is the equivalent inductance (unit: H) of the coil; c is the capacitance (unit: F) of the resonance capacitor.
In this embodiment, as shown in fig. 1, the frequency-selecting characteristic of the circuit can be adjusted by directly adjusting the values of L1 and C1.
In this embodiment, the inductance value l of the sensing coil is: l =0.01DN 2/(L/D + 0.44); wherein, N is the coil number of turns, D is the coil diameter, and L is the coil total length.
In this embodiment, the annular magnetic core is an annular magnetic core with a notch.
Example 3:
as shown in fig. 1, 6, 7, and 8, embodiment 3 of the present invention provides a low-cost high-frequency current signal sensor, including: the circuit comprises an annular magnetic core 1 with a gap and used for surrounding a measured circuit 3, and a sensing coil 2 is arranged at the gap position of the annular magnetic core, so that magnetic lines of force completely or partially pass through a space surrounded by the sensing coil 2;
and the two ends of the sensing coil 2 are connected with a resonant capacitor in parallel, and the intensity of the high-frequency current signal is determined according to the proportional relation between the output signal and the intensity of the current high-frequency signal.
In this embodiment, the sensing coil 2 may use a structure such as an on-board coil or an enameled wire of a PCB, and the equivalent inductance of the sensing coil 2 is calculated through the magnetic permeability and the air gap width (the opening width of the magnetic core), the two ends of the sensing coil 2 are connected in parallel with a resonant capacitor for optimizing the frequency-selective quality, the output signal only includes a high-frequency part, and when the spatial positions of the magnetic core and the sensing coil are relatively fixed, the output signal is proportional to the high-frequency component of the current, and the ratio is fixed.
The equivalent circuit is an LC resonance circuit, and according to a resonance frequency calculation formula:
Figure 563956DEST_PATH_IMAGE001
wherein f is frequency (unit: Hz); pi is the circumference ratio; l is the equivalent inductance (unit: H) of the coil; c is the capacitance (unit: F) of the resonance capacitor.
In this embodiment, as shown in fig. 1, the frequency-selecting characteristic of the circuit can be adjusted by directly adjusting the values of L1 and C1
In this embodiment, the sensing coil provided at the notch position of the annular magnetic core is an on-board coil.
The inductance value l of the sensing coil is: l =0.01DN 2/(L/D + 0.44); wherein, N is the coil number of turns, D is the coil diameter, and L is the coil total length.
In this embodiment, the annular magnetic core is an open-close type annular magnetic core with a notch, and includes 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 a notch is provided between a second end of the first magnetic core and a second end of the second magnetic core.
Example 4:
as shown in fig. 1, 9, 10, and 11, embodiment 4 of the present invention provides a low-cost high-frequency current signal sensor, including: the circuit comprises an annular magnetic core 1 with a gap and used for surrounding a measured circuit 3, and a sensing coil 2 is arranged at the gap position of the annular magnetic core, so that magnetic lines of force completely or partially pass through a space surrounded by the sensing coil 2;
and the two ends of the sensing coil 2 are connected with a resonant capacitor in parallel, and the intensity of the high-frequency current signal is determined according to the proportional relation between the output signal and the intensity of the current high-frequency signal.
In this embodiment, the sensing coil 2 may use a structure such as an on-board coil of a PCB or an enameled wire, and the equivalent inductance of the sensing coil 2 is calculated through the magnetic permeability and the air gap width (the opening width of the magnetic core), two ends of the sensing coil 2 are connected in parallel with a resonant capacitor for optimizing the frequency selection quality, the output signal only includes a high-frequency part, and when the spatial positions of the magnetic core and the sensing coil are relatively fixed, the output signal is proportional to the high-frequency component of the current, and the ratio is fixed.
The equivalent circuit is an LC resonance circuit, and according to a resonance frequency calculation formula:
Figure 291741DEST_PATH_IMAGE001
wherein f is frequency (unit: Hz); pi is the circumference ratio; l is the equivalent inductance (unit: H) of the coil; c is the capacitance value (unit: F) of the resonance capacitor.
In this embodiment, as shown in fig. 1, the frequency-selecting characteristic of the circuit can be adjusted by directly adjusting the values of L1 and C1
In this embodiment, the sensing coil provided at the notch position of the annular magnetic core is an on-board coil.
The inductance value l of the sensing coil is: l =0.01DN 2/(L/D + 0.44); wherein, N is the coil number of turns, D is the coil diameter, and L is the coil total length.
In this embodiment, annular magnetic core is for having notched open-close type direction or the annular magnetic core of rectangle, including first magnetic core and second magnetic core, the first end swing joint of first magnetic core and the first end of second magnetic core, is the breach between the second end of first magnetic core and the second end of second magnetic core.
Example 5:
as shown in fig. 1 and 12, embodiment 5 of the present invention provides a low-cost high-frequency current signal sensor, including: the circuit comprises an annular magnetic core 1 with a gap and used for surrounding a measured circuit 3, and a sensing coil 2 is arranged at the gap position of the annular magnetic core, so that magnetic lines of force completely or partially pass through a space surrounded by the sensing coil 2;
and the two ends of the sensing coil 2 are connected with a resonant capacitor in parallel, and the intensity of the high-frequency current signal is determined according to the proportional relation between the output signal and the intensity of the current high-frequency signal.
In this embodiment, the sensing coil 2 may use a structure such as an on-board coil of a PCB or an enameled wire, and the equivalent inductance of the sensing coil 2 is calculated through the magnetic permeability and the air gap width (the opening width of the magnetic core), two ends of the sensing coil 2 are connected in parallel with a resonant capacitor for optimizing the frequency selection quality, the output signal only includes a high-frequency part, and when the spatial positions of the magnetic core and the sensing coil are relatively fixed, the output signal is proportional to the high-frequency component of the current, and the ratio is fixed.
The equivalent circuit is an LC resonance circuit, and according to a resonance frequency calculation formula:
Figure 593540DEST_PATH_IMAGE001
wherein f is frequency (unit: Hz); pi is the circumference ratio; l is the equivalent inductance (unit: H) of the coil; c is the capacitance (unit: F) of the resonance capacitor.
In this embodiment, as shown in fig. 1, the frequency-selecting characteristic of the circuit can be adjusted by directly adjusting the values of L1 and C1.
In this embodiment, the sensing coil provided at the notch position of the annular magnetic core is an on-board coil.
The inductance value l of the sensing coil is: l =0.01DN 2/(L/D + 0.44); wherein, N is the coil number of turns, D is the coil diameter, and L is the coil total length.
In this embodiment, the annular magnetic core is a notched or rectangular annular magnetic core.
Example 6:
as shown in fig. 1 and 13, embodiment 6 of the present invention provides a low-cost high-frequency current signal sensor including: the annular magnetic core 1 is provided with a gap and used for surrounding a measured line 3, and the sensing coil 2 is arranged on the annular magnetic core 1 in a surrounding manner so that magnetic lines of force all penetrate through a space surrounded by the sensing coil;
the two ends of the sensing coil 2 are connected in parallel with a resonant capacitor, and the intensity of the high-frequency current signal is determined according to the proportional relation between the output signal and the intensity of the current high-frequency signal.
In this embodiment, the sensing coil 2 may use a structure such as an on-board coil of a PCB or an enameled wire, and the equivalent inductance of the sensing coil 2 is calculated through the magnetic permeability and the air gap width (the opening width of the magnetic core), two ends of the sensing coil 2 are connected in parallel with a resonant capacitor for optimizing the frequency selection quality, the output signal only includes a high-frequency part, and when the spatial positions of the magnetic core and the sensing coil are relatively fixed, the output signal is proportional to the high-frequency component of the current, and the ratio is fixed.
The equivalent circuit is an LC resonance circuit, and according to a resonance frequency calculation formula:
Figure 64973DEST_PATH_IMAGE001
wherein f is frequency (unit: Hz); pi is the circumference ratio; l is the equivalent inductance (unit: H) of the coil; c is the capacitance (unit: F) of the resonance capacitor.
In this embodiment, as shown in fig. 1, the frequency-selecting characteristic of the circuit can be adjusted by directly adjusting the values of L1 and C1.
In this embodiment, the inductance value l of the sensing coil is: l =0.01DN 2/(L/D + 0.44); wherein, N is the coil number of turns, D is the coil diameter, and L is the coil total length.
In this embodiment, annular magnetic core is for having notched open-close type direction or the annular magnetic core of rectangle, including first magnetic core and second magnetic core, the first end swing joint of first magnetic core and the first end of second magnetic core, is the breach between the second end of first magnetic core and the second end of second magnetic core.
Example 7:
as shown in fig. 1 and 14, embodiment 7 of the present invention provides a low-cost high-frequency current signal sensor including: the annular magnetic core 1 is provided with a gap and used for surrounding a measured line 3, and the sensing coil 2 is arranged on the annular magnetic core 1 in a surrounding manner so that magnetic lines of force all penetrate through a space surrounded by the sensing coil;
two ends of the sensing coil 2 are connected in parallel with a resonant capacitor, and the intensity of the high-frequency current signal is determined according to the proportional relation between the output signal and the intensity of the current high-frequency signal.
In this embodiment, the sensing coil 2 may use a structure such as an on-board coil of a PCB or an enameled wire, and the equivalent inductance of the sensing coil 2 is calculated through the magnetic permeability and the air gap width (the opening width of the magnetic core), two ends of the sensing coil 2 are connected in parallel with a resonant capacitor for optimizing the frequency selection quality, the output signal only includes a high-frequency part, and when the spatial positions of the magnetic core and the sensing coil are relatively fixed, the output signal is proportional to the high-frequency component of the current, and the ratio is fixed.
The equivalent circuit is an LC resonance circuit, and according to a resonance frequency calculation formula:
Figure 385096DEST_PATH_IMAGE001
wherein f is frequency (unit: Hz); pi is the circumference ratio; l is the equivalent inductance (unit: H) of the coil; c is the capacitance (unit: F) of the resonance capacitor.
In this embodiment, as shown in fig. 1, the frequency-selecting characteristic of the circuit can be adjusted by directly adjusting the values of L1 and C1.
In this embodiment, the inductance value l of the sensing coil is: l =0.01DN 2/(L/D + 0.44); wherein, N is the coil number of turns, D is the coil diameter, and L is the coil total length.
In this embodiment, the annular magnetic core is a notched or rectangular annular magnetic core.
Example 8:
as shown in fig. 1 and 15, embodiment 8 of the present invention provides a low-cost high-frequency current signal sensor including: the annular magnetic core 1 is provided with a gap and used for surrounding a measured line 3, and the sensing coil 2 is arranged on the annular magnetic core 1 in a surrounding manner so that magnetic lines of force all penetrate through a space surrounded by the sensing coil;
the two ends of the sensing coil 2 are connected in parallel with a resonant capacitor, and the intensity of the high-frequency current signal is determined according to the proportional relation between the output signal and the intensity of the current high-frequency signal.
In this embodiment, the sensing coil 2 may use a structure such as an on-board coil of a PCB or an enameled wire, and the equivalent inductance of the sensing coil 2 is calculated through the magnetic permeability and the air gap width (the opening width of the magnetic core), two ends of the sensing coil 2 are connected in parallel with a resonant capacitor for optimizing the frequency selection quality, the output signal only includes a high-frequency part, and when the spatial positions of the magnetic core and the sensing coil are relatively fixed, the output signal is proportional to the high-frequency component of the current, and the ratio is fixed.
The equivalent circuit is an LC resonance circuit, and according to a resonance frequency calculation formula:
Figure 549361DEST_PATH_IMAGE001
wherein f is frequency (unit: Hz); pi is the circumference ratio; l is the equivalent inductance (unit: H) of the coil; c is the capacitance (unit: F) of the resonance capacitor.
In this embodiment, as shown in fig. 1, the frequency-selective characteristic of the circuit can be adjusted by directly adjusting the values of L1 and C1.
In this embodiment, the inductance value l of the sensing coil is: l =0.01DN 2/(L/D + 0.44); wherein, N is the coil number of turns, D is the coil diameter, and L is the coil total length.
In this embodiment, the annular magnetic core is a circular annular magnetic core with a notch.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A low-cost high-frequency current signal sensor, characterized by:
the method comprises the following steps: the annular magnetic core is provided with a gap and used for surrounding a measured line, and the sensing coil is arranged at the gap position of the annular magnetic core so that the magnetic lines of force completely or partially pass through a space surrounded by the sensing coil;
and the two ends of the sensing coil are connected with a resonant capacitor in parallel, and the intensity of the high-frequency current signal is determined according to the proportional relation between the output signal and the intensity of the current high-frequency signal.
2. The low cost high frequency current signal sensor of claim 1, wherein:
the sensing coil arranged at the notch position of the annular magnetic core is an on-board coil.
3. A low cost high frequency current signal sensor as claimed in claim 1 or 2 wherein:
the inductance value l of the sensing coil is: l =0.01DN 2/(L/D + 0.44); wherein, N is the coil number of turns, D is the coil diameter, and L is the coil total length.
4. The low cost high frequency current signal sensor of claim 1, wherein:
the annular magnetic core is an annular magnetic core with a notch.
5. The low cost high frequency current signal sensor of claim 1, wherein:
the annular magnetic core is a square or rectangular annular magnetic core with a notch.
6. The low cost high frequency current signal sensor of claim 1, wherein:
annular magnetic core is for having notched open-close type annular magnetic core, including first magnetic core and second magnetic core, the first end of first magnetic core and the first end swing joint of second magnetic core, is the breach between the second end of first magnetic core and the second end of second magnetic core.
7. A low-cost high-frequency current signal sensor, characterized by:
the method comprises the following steps: the annular magnetic core is provided with a gap and used for surrounding a measured line, and the sensing coil is arranged on the annular magnetic core in a surrounding manner so that magnetic lines of force all penetrate through a space defined by the sensing coil;
and the two ends of the sensing coil are connected with a resonant capacitor in parallel, and the intensity of the high-frequency current signal is determined according to the proportional relation between the output signal and the intensity of the current high-frequency signal.
8. The low cost high frequency current signal sensor of claim 7, wherein:
the inductance value l of the sensing coil is: l =0.01DN 2/(L/D + 0.44); wherein, N is the coil number of turns, D is the coil diameter, and L is the coil total length.
9. The low cost high frequency current signal sensor of claim 7, wherein:
the annular magnetic core is an annular magnetic core with a notch; or, the annular magnetic core is a square or rectangular annular magnetic core with a notch.
10. The low cost high frequency current signal sensor of claim 7, wherein:
annular magnetic core is for having notched open-close type annular magnetic core, including first magnetic core and second magnetic core, the first end of first magnetic core and the first end swing joint of second magnetic core, is the breach between the second end of first magnetic core and the second end of second magnetic core.
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