CN115020094A - A low-cost high-frequency current signal sensor - Google Patents

Abstract

The invention provides a low-cost high-frequency current signal sensor, which belongs to the technical field of electrical variable measurement. The low-cost high-frequency current signal sensor includes: a ring-shaped magnetic core with a gap for surrounding the circuit to be measured, and the sensing coil is arranged at the gap position of the ring-shaped magnetic core, so that the magnetic line of force passes through the sensor in whole or in part. The space enclosed by the measuring coil; the two ends of the sensing coil are connected in parallel with resonant capacitors, and the strength of the high-frequency current signal is determined according to the proportional relationship between the output signal and the strength of the current high-frequency signal; the present invention has low requirements on the material of the magnetic core , good frequency characteristics can be obtained, the acquisition frequency range is wide, and the acquisition of high-frequency current signals can be realized. Frequency characteristics, eliminating the need for post-frequency selection circuit, greatly reducing the cost.

Description

A 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 technique

The statements in this section merely provide background related to the present disclosure and do not necessarily constitute prior art.

AC line faults basically use current signals or high-frequency signals (usually in the range of 3MHZ~30MHZ) as the detection basis, in which high-frequency signal acquisition relies on high-frequency current transformers or Rogowski coils.

The inventor found that the high-frequency current transformer requires the use of high-frequency and low-hysteresis materials, and the output frequency range needs to be customized or use a post-frequency selection circuit; the Rogowski coil requires higher manufacturing precision and high manufacturing costs, and also requires a post-frequency selection circuit. .

Chinese patent CN201911109810.X discloses a current transformer with wide-band, wide-band measurement and anti-magnetic interference capabilities, which is provided with a Hall element at the air gap, and the frequency domain of the Hall element's sensing signal is affected by the parameters of the element itself. Restriction, the frequency domain is limited to a small area (generally less than 1MHZ), and the detection of high-frequency signals for fault detection cannot be realized.

SUMMARY OF THE INVENTION

In order to solve the shortcomings of the prior art, the present invention provides a low-cost high-frequency current signal sensor, which uses a magnetic core with an air gap, has low requirements on the material of the magnetic core, can obtain good frequency characteristics, and has a wide acquisition frequency range. It can realize the acquisition of high-frequency current signals. The coil is placed at the air gap of the magnetic core or wound on the magnetic core with an air gap. Good frequency selection characteristics can be obtained through impedance design, and the post frequency selection circuit can be omitted. Reduced costs.

In order to achieve the above object, the present invention adopts the following technical solutions:

A first aspect of the present invention provides a low-cost high-frequency current signal sensor.

A low-cost high-frequency current signal sensor, comprising: a ring-shaped magnetic core with a gap for surrounding a circuit under test, a sensing coil is arranged at the gap position of the ring-shaped magnetic core, so that all or part of the magnetic line of force passes through the sensor. The space enclosed by the measuring coil;

Two ends of the sensing coil are connected in parallel with resonant capacitors, and the strength of the high-frequency current signal is determined according to the proportional relationship between the output signal and the strength of the current high-frequency signal.

It can be understood that the annular magnetic core can be circular or square, or other shapes, such as ellipse, rectangle, pentagon, hexagon, and so on.

As an optional implementation manner, the sensing coil provided at the notch position of the annular magnetic core is an on-board coil.

As an optional implementation, the inductance l of the sensing coil is: l=0.01DN2/(L/D+0.44); wherein, N is the number of turns of the coil, D is the diameter of the coil, and L is the total length of the coil.

As an optional implementation manner, the annular magnetic core is a circular annular magnetic core with a gap.

As an optional 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 annular magnetic core with a gap, including a first magnetic core and a second magnetic core, the first end of the first magnetic core and the second magnetic core The first end of the core is movably connected, and a gap is formed between the second end of the first magnetic core and the second end of the second magnetic core.

A second aspect of the present invention provides a low-cost high-frequency current signal sensor.

A low-cost high-frequency current signal sensor, comprising: a ring-shaped magnetic core with a gap for surrounding the circuit under test, the sensing coil is arranged around the ring-shaped magnetic core, so that the magnetic lines of force all pass through the surrounding of the sensing coil. formed space;

Two ends of the sensing coil are connected in parallel with resonant capacitors, and the strength of the high-frequency current signal is determined according to the proportional relationship between the output signal and the strength of the current high-frequency signal.

As an optional implementation manner, the inductance value L of the sensing coil is: L=0.01DN2/(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 a circular annular magnetic core with a gap; or, the annular magnetic core is a square or rectangular annular magnetic core with a gap.

As an optional implementation manner, the annular magnetic core is an open-close annular magnetic core with a gap, including a first magnetic core and a second magnetic core, the first end of the first magnetic core and the second magnetic core The first end of the core is movably connected, and a gap is formed between the second end of the first magnetic core and the second end of the second magnetic core.

Compared with the prior art, the beneficial effects of the present invention are:

1. The low-cost high-frequency current signal sensor of the present invention uses a magnetic core with an air gap, which has low requirements on the material of the magnetic core, can obtain good frequency characteristics, has a wide collection frequency range, and can realize the high-frequency current signal. collection.

2. In the low-cost high-frequency current signal sensor of the present invention, the coil is placed at the air gap of the magnetic core or wound around the magnetic core with an air gap, and good frequency selection characteristics can be obtained through impedance design, eliminating the need for post-selection selection. frequency circuit, greatly reducing the cost.

Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will become apparent from the description which follows, or may be learned by practice of the invention.

Description of drawings

The accompanying drawings forming a part of the present invention are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation of the present invention.

FIG. 1 is a schematic diagram of a low-cost high-frequency current signal sensor provided by an embodiment of the present invention.

FIG. 2 is a schematic diagram 1 of the positions of the magnetic core and the sensing coil according to Embodiment 1 of the present invention.

FIG. 3 is a second schematic diagram of the positions of the magnetic core and the sensing coil according to Embodiment 1 of the present invention.

FIG. 4 is a schematic diagram 1 of the positions of the magnetic core and the sensing coil according to Embodiment 2 of the present invention.

FIG. 5 is a second schematic diagram of the positions of the magnetic core and the sensing coil according to Embodiment 2 of the present invention.

FIG. 6 is a schematic diagram 1 of the positions of the magnetic core and the sensing coil according to Embodiment 3 of the present invention.

FIG. 7 is a second schematic diagram of the positions of the magnetic core and the sensing coil according to Embodiment 3 of the present invention.

FIG. 8 is a third schematic diagram of the positions of the magnetic core and the sensing coil according to Embodiment 3 of the present invention.

FIG. 9 is a schematic diagram 1 of the positions of the magnetic core and the sensing coil according to Embodiment 4 of the present invention.

FIG. 10 is a second schematic diagram of the positions of the magnetic core and the sensing coil according to Embodiment 4 of the present invention.

FIG. 11 is a third schematic diagram of 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 according to Embodiment 5 of the present invention.

FIG. 13 is a schematic diagram of the positions of the magnetic core and the sensing coil according to Embodiment 6 of the present invention.

FIG. 14 is a schematic diagram of the positions of the magnetic core and the sensing coil according to 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.

Among them, 1-ring magnetic core; 2-sensing coil; 3-tested circuit.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the invention. Unless otherwise defined, 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 should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

Embodiments of the invention and features of the embodiments may be combined with each other without conflict.

Example 1:

As shown in FIG. 1, FIG. 2 and FIG. 3, Embodiment 1 of the present invention provides a low-cost high-frequency current signal sensor, including: a ring-shaped magnetic core 1 with a gap for surrounding the circuit 3 under test, a sensor The measuring coil 2 is arranged at the notch position of the annular magnetic core, so that the magnetic force line passes through the space enclosed by the sensing coil 2 in whole or in part;

Two ends of the sensing coil 2 are connected in parallel with resonant capacitors, and the strength of the high-frequency current signal is determined according to the proportional relationship between the output signal and the strength of the current high-frequency signal.

In this embodiment, the sensing coil 2 can use the on-board coil or enameled wire structure of the PCB, and calculate the equivalent inductance of the sensing coil 2 through the magnetic core permeability and the air gap width (magnetic core opening width). A resonant capacitor is connected in parallel at both ends of 2 to optimize the quality of frequency selection. The output signal only contains the high-frequency part. When the spatial position of the magnetic core and the sensing coil is 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 resonant circuit, which is calculated according to the resonant frequency formula:

Among them, f is the frequency (unit: Hz); π is the pi; L is the equivalent inductance of the coil (unit: H); C is the capacitance of the resonance capacitor (unit: F).

In this embodiment, as shown in FIG. 1 , the frequency selection characteristic of the circuit can be adjusted directly by 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 l of the sensing coil is: l=0.01DN2/(L/D+0.44); among them, N is the number of turns of the coil, D is the diameter of the coil, and L is the total length of the coil.

In this embodiment, the annular magnetic core is a circular annular magnetic core with a notch.

Example 2:

As shown in FIG. 1, FIG. 4 and FIG. 5, Embodiment 2 of the present invention provides a low-cost high-frequency current signal sensor, comprising: a ring-shaped magnetic core 1 with a notch for surrounding the circuit 3 under test, a sensor The measuring coil 2 is arranged around the annular magnetic core 1, so that the magnetic lines of force all pass through the space enclosed by the sensing coil;

Two ends of the sensing coil 2 are connected in parallel with resonant capacitors, and the strength of the high-frequency current signal is determined according to the proportional relationship between the output signal and the strength of the current high-frequency signal.

In this embodiment, the sensing coil 2 can use the on-board coil or enameled wire structure of the PCB, and calculate the equivalent inductance of the sensing coil 2 through the magnetic core permeability and the air gap width (magnetic core opening width). A resonant capacitor is connected in parallel at both ends of 2 to optimize the quality of frequency selection. The output signal only contains the high-frequency part. When the spatial position of the magnetic core and the sensing coil is 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 resonant circuit, which is calculated according to the resonant frequency formula:

Among them, f is the frequency (unit: Hz); π is the pi; L is the equivalent inductance of the coil (unit: H); C is the capacitance of the resonance capacitor (unit: F).

In this embodiment, as shown in FIG. 1 , the frequency selection characteristic of the circuit can be adjusted directly by adjusting the values of L1 and C1 .

In this embodiment, the inductance l of the sensing coil is: l=0.01DN2/(L/D+0.44); wherein, N is the number of turns of the coil, D is the diameter of the coil, and L is the total length of the coil.

In this embodiment, the annular magnetic core is a circular annular magnetic core with a notch.

Example 3:

As shown in FIG. 1 , FIG. 6 , FIG. 7 and FIG. 8 , Embodiment 3 of the present invention provides a low-cost high-frequency current signal sensor, including: a ring-shaped magnetic core with a notch for surrounding the circuit under test 3 1. The sensing coil 2 is arranged at the notch position of the annular magnetic core, so that all or part of the magnetic lines of force pass through the space enclosed by the sensing coil 2;

Two ends of the sensing coil 2 are connected in parallel with resonant capacitors, and the strength of the high-frequency current signal is determined according to the proportional relationship between the output signal and the strength of the current high-frequency signal.

In this embodiment, the sensing coil 2 can use the on-board coil or enameled wire structure of the PCB, and calculate the equivalent inductance of the sensing coil 2 through the magnetic core permeability and the air gap width (magnetic core opening width). A resonant capacitor is connected in parallel at both ends of 2 to optimize the quality of frequency selection. The output signal only contains the high-frequency part. When the spatial position of the magnetic core and the sensing coil is 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 resonant circuit, which is calculated according to the resonant frequency formula:

Among them, f is the frequency (unit: Hz); π is the pi; L is the equivalent inductance of the coil (unit: H); C is the capacitance of the resonance capacitor (unit: F).

In this embodiment, as shown in Figure 1, the frequency selection characteristics of the circuit can be adjusted directly by 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 l of the sensing coil is: l=0.01DN2/(L/D+0.44); among them, N is the number of turns of the coil, D is the diameter of the coil, and L is the total length of the coil.

In this embodiment, the annular magnetic core is an open-close annular magnetic core with a gap, including a first magnetic core and a second magnetic core, the first end of the first magnetic core and the third magnetic core of the second magnetic core One end is movably connected, and a gap is formed between the second end of the first magnetic core and the second end of the second magnetic core.

Example 4:

As shown in FIG. 1 , FIG. 9 , FIG. 10 and FIG. 11 , Embodiment 4 of the present invention provides a low-cost high-frequency current signal sensor, comprising: a ring-shaped magnetic core with a gap for surrounding the circuit 3 under test 1. The sensing coil 2 is arranged at the notch position of the annular magnetic core, so that all or part of the magnetic lines of force pass through the space enclosed by the sensing coil 2;

Two ends of the sensing coil 2 are connected in parallel with resonant capacitors, and the strength of the high-frequency current signal is determined according to the proportional relationship between the output signal and the strength of the current high-frequency signal.

In this embodiment, the sensing coil 2 can use the on-board coil or enameled wire structure of the PCB, and calculate the equivalent inductance of the sensing coil 2 through the magnetic core permeability and the air gap width (magnetic core opening width). A resonant capacitor is connected in parallel at both ends of 2 to optimize the quality of frequency selection. The output signal only contains the high-frequency part. When the spatial position of the magnetic core and the sensing coil is 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 resonant circuit, which is calculated according to the resonant frequency formula:

Among them, f is the frequency (unit: Hz); π is the pi; L is the equivalent inductance of the coil (unit: H); C is the capacitance of the resonance capacitor (unit: F).

In this embodiment, as shown in Figure 1, the frequency selection characteristics of the circuit can be adjusted directly by 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 l of the sensing coil is: l=0.01DN2/(L/D+0.44); among them, N is the number of turns of the coil, D is the diameter of the coil, and L is the total length of the coil.

In this embodiment, the annular magnetic core is an open-close direction or rectangular annular magnetic core with a gap, including a first magnetic core and a second magnetic core, a first end of the first magnetic core and a second magnetic core The first end of the first magnetic core is flexibly connected, and a gap is formed between the second end of the first magnetic core and the second end of the second magnetic core.

Example 5:

As shown in FIG. 1 and FIG. 12 , Embodiment 5 of the present invention provides a low-cost high-frequency current signal sensor, including: a ring-shaped magnetic core 1 with a gap for surrounding the circuit 3 under test, a sensing coil 2 It is arranged at the notch position of the annular magnetic core, so that all or part of the magnetic lines of force pass through the space enclosed by the sensing coil 2;

Two ends of the sensing coil 2 are connected in parallel with resonant capacitors, and the strength of the high-frequency current signal is determined according to the proportional relationship between the output signal and the strength of the current high-frequency signal.

In this embodiment, the sensing coil 2 can use the on-board coil or enameled wire structure of the PCB, and calculate the equivalent inductance of the sensing coil 2 through the magnetic core permeability and the air gap width (magnetic core opening width). A resonant capacitor is connected in parallel at both ends of 2 to optimize the quality of frequency selection. The output signal only contains the high-frequency part. When the spatial position of the magnetic core and the sensing coil is 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 resonant circuit, which is calculated according to the resonant frequency formula:

Among them, f is the frequency (unit: Hz); π is the pi; L is the equivalent inductance of the coil (unit: H); C is the capacitance of the resonance capacitor (unit: F).

In this embodiment, as shown in FIG. 1 , the frequency selection characteristic of the circuit can be adjusted directly by 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 l of the sensing coil is: l=0.01DN2/(L/D+0.44); among them, N is the number of turns of the coil, D is the diameter of the coil, and L is the total length of the coil.

In this embodiment, the annular magnetic core is a direction with a notch or a rectangular annular magnetic core.

Example 6:

As shown in FIG. 1 and FIG. 13 , Embodiment 6 of the present invention provides a low-cost high-frequency current signal sensor, including: a ring-shaped magnetic core 1 with a gap for surrounding the circuit 3 under test, a sensing coil 2 It is arranged around the annular magnetic core 1, so that all the magnetic lines of force pass through the space enclosed by the sensing coil;

Two ends of the sensing coil 2 are connected in parallel with resonant capacitors, and the strength of the high-frequency current signal is determined according to the proportional relationship between the output signal and the strength of the current high-frequency signal.

In this embodiment, the sensing coil 2 can use the on-board coil or enameled wire structure of the PCB, and calculate the equivalent inductance of the sensing coil 2 through the magnetic core permeability and the air gap width (magnetic core opening width). A resonant capacitor is connected in parallel at both ends of 2 to optimize the quality of frequency selection. The output signal only contains the high-frequency part. When the spatial position of the magnetic core and the sensing coil is 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 resonant circuit, which is calculated according to the resonant frequency formula:

Among them, f is the frequency (unit: Hz); π is the pi; L is the equivalent inductance of the coil (unit: H); C is the capacitance of the resonance capacitor (unit: F).

In this embodiment, as shown in FIG. 1 , the frequency selection characteristic of the circuit can be adjusted directly by adjusting the values of L1 and C1.

In this embodiment, the inductance l of the sensing coil is: l=0.01DN2/(L/D+0.44); wherein, N is the number of turns of the coil, D is the diameter of the coil, and L is the total length of the coil.

In this embodiment, the annular magnetic core is an open-close direction or rectangular annular magnetic core with a gap, including a first magnetic core and a second magnetic core, a first end of the first magnetic core and a second magnetic core The first end of the first magnetic core is flexibly connected, and a gap is formed between the second end of the first magnetic core and the second end of the second magnetic core.

Example 7:

As shown in FIG. 1 and FIG. 14 , Embodiment 7 of the present invention provides a low-cost high-frequency current signal sensor, including: a ring-shaped magnetic core 1 with a gap for surrounding the circuit 3 under test, a sensing coil 2 It is arranged around the annular magnetic core 1, so that all the magnetic lines of force pass through the space enclosed by the sensing coil;

Two ends of the sensing coil 2 are connected in parallel with resonant capacitors, and the strength of the high-frequency current signal is determined according to the proportional relationship between the output signal and the strength of the current high-frequency signal.

In this embodiment, the sensing coil 2 can use the on-board coil or enameled wire structure of the PCB, and calculate the equivalent inductance of the sensing coil 2 through the magnetic core permeability and the air gap width (magnetic core opening width). A resonant capacitor is connected in parallel at both ends of 2 to optimize the quality of frequency selection. The output signal only contains the high-frequency part. When the spatial position of the magnetic core and the sensing coil is 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 resonant circuit, which is calculated according to the resonant frequency formula:

Among them, f is the frequency (unit: Hz); π is the pi; L is the equivalent inductance of the coil (unit: H); C is the capacitance of the resonance capacitor (unit: F).

In this embodiment, as shown in FIG. 1 , the frequency selection characteristic of the circuit can be adjusted directly by adjusting the values of L1 and C1.

In this embodiment, the inductance l of the sensing coil is: l=0.01DN2/(L/D+0.44); wherein, N is the number of turns of the coil, D is the diameter of the coil, and L is the total length of the coil.

In this embodiment, the annular magnetic core is a direction with a notch or a rectangular annular magnetic core.

Example 8:

As shown in FIG. 1 and FIG. 15 , Embodiment 8 of the present invention provides a low-cost high-frequency current signal sensor, including: a ring-shaped magnetic core 1 with a gap for surrounding the circuit 3 under test, a sensing coil 2 It is arranged around the annular magnetic core 1, so that all the magnetic lines of force pass through the space enclosed by the sensing coil;

Two ends of the sensing coil 2 are connected in parallel with resonant capacitors, and the strength of the high-frequency current signal is determined according to the proportional relationship between the output signal and the strength of the current high-frequency signal.

In this embodiment, the sensing coil 2 can use the on-board coil or enameled wire structure of the PCB, and calculate the equivalent inductance of the sensing coil 2 through the magnetic core permeability and the air gap width (magnetic core opening width). A resonant capacitor is connected in parallel at both ends of 2 to optimize the quality of frequency selection. The output signal only contains the high-frequency part. When the spatial position of the magnetic core and the sensing coil is 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 resonant circuit, and the formula for calculating the resonant frequency is:

Among them, f is the frequency (unit: Hz); π is the pi; L is the equivalent inductance of the coil (unit: H); C is the capacitance of the resonant capacitor (unit: F).

In this embodiment, as shown in FIG. 1 , the frequency selection characteristic of the circuit can be adjusted directly by adjusting the values of L1 and C1 .

In this embodiment, the inductance l of the sensing coil is: l=0.01DN2/(L/D+0.44); wherein, N is the number of turns of the coil, D is the diameter of the coil, and L is the total length of the coil.

In this embodiment, the annular magnetic core is a circular annular magnetic core with a notch.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within 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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