Apparatus for detecting magnetic characteristic of magnetic material

Abstract

The present invention relates to a device for detecting the magnetization characteristics of a magnetic material, wherein the device for detecting the magnetization characteristics of a magnetic material comprises: a high-frequency generation module that generates and outputs a high-frequency signal to a high-frequency transmission coil of an FMMD (Frequency Mixing Magnetic Detection) coil; a low-frequency generation module that generates and outputs a low-frequency signal to a low-frequency transmission coil of an FMMD coil; a low-frequency detection module that measures a loopback signal of a low-frequency signal applied to a low-frequency transmission coil; a variable frequency filter that adjusts the phase of a magnetization signal detected from a detection coil of an FMMD coil; and a magnetization signal detection module that detects a magnetization signal filtered through a variable frequency filter. The apparatus comprises a processor operatively coupled to a high-frequency generation module, a low-frequency generation module, a low-frequency detection module, a variable frequency filter, and a magnetization signal detection module; wherein the processor drives one or more of the high-frequency generation module and the low-frequency generation module according to a detection mode input from an input / output module, and generates an amount of magnetic material and a magnetization characteristic curve based on signals detected through the low-frequency detection module, the variable frequency filter, and the magnetization signal detection module.

Description

Technology Field

[0001] The present invention relates to a magnetic material magnetization characteristic detection device capable of not only measuring the amount of magnetic material but also obtaining a magnetization characteristic curve using an FMMD (Frequency Mixing Magnetic Detection) based magnetic material analysis device. Background Technology

[0002] The method of measuring changes in a magnetic field after applying a magnetic field using direct current (DC) or alternating current to an object is one of the analytical methods with a very long history. This method is still the subject of much research today, and it is a field where new products are being released in the market.

[0003] Technology development in this field is mainly being researched in the direction of developing techniques to precisely apply electromagnetic fields to the material being measured, improving methods to remove the applied magnetic field which is very large compared to the input signal and detect small signals, or processing these signals from a software perspective.

[0004] The most important goal of these methods is to identify the magnetization characteristic curve (MH Curve) of the material being measured. The most traditional and reliable method for obtaining such a magnetization characteristic curve is to use a DC magnetic field.

[0005] However, the method using a DC magnetic field requires measuring the magnetic field while constantly increasing the strength of the magnetic field applied to the coil, which results in a very long analysis time. Furthermore, since most of the equipment used is expensive, there are significant difficulties in terms of cost.

[0006] However, in actual research settings, since the trends of the target material must be verified quickly in most cases, speed is required rather than precision in the process of acquiring magnetization characteristic curves, and various studies are being conducted regarding this aspect.

[0007] For example, an analysis method that obtains a signal for a magnetization characteristic curve after applying an AC magnetic field to a material to be measured can obtain more information in a shorter time than when using a DC magnetic field.

[0008] However, when using AC magnetic fields, there are disadvantages, such as the difficulty in generating high-power signals due to impedance components that are a function of frequency, and the relative difficulty in considering the hysteresis characteristics of materials compared to when using DC magnetic fields. Additionally, in the case of AC magnetic fields, signal processing operations are required for magnetic field generation, detection, and detection signal analysis.

[0009] Despite these issues, the reason for utilizing AC signals to reconstruct the magnetization characteristic curve of the target magnetic material is that averaging signals over multiple cycles allows for the curve to be restored relatively stably without the need for separate shielding. Furthermore, there is a significant advantage in that the magnetization characteristic curve can be restored within seconds using AC signals, whereas it takes several hours when using DC signals.

[0010] The background technology of the present invention is disclosed in Korean Published Patent Application No. 10-2004-0086852 (published on October 12, 2004).

[0011] The information described above disclosed in the background technology of this invention is intended only to enhance understanding of the background of the present invention and may therefore include information that does not constitute prior art. The problem to be solved

[0012] FMMD (Frequency Mixing Magnetic Detection) technology is a technology that generates an alternating magnetic field by applying two different frequencies to a transmitting coil, receives the signal of a magnetic material that responds to this magnetic field using a detection coil, and measures the amount of the material by frequency analyzing the harmonic peaks of the signal.

[0013] In order to analyze the magnetization characteristics of magnetic materials, a magnetization characteristic curve (MH curve) is used. Here, the magnetization characteristic curve is a method that visually shows the degree of magnetization of a magnetic material according to an external magnetic field. To obtain this, there are methods such as the MPMS (Magnetic Property Measurement System) using a SQUID (Superconducting Quantum Interference Device) and the VSM (Vibrating Sample Magnetometer) method for obtaining the signal.

[0014] In this case, the MPMS method enables precise measurements, whereas the VSM method has low sensitivity and is used for measuring general materials with high magnetic susceptibility.

[0015] Obtaining the magnetization characteristics of magnetic materials in this way can be used to understand the properties of magnetic materials, select magnetic materials, and design magnetic storage devices and electromagnetic components.

[0016] The objective of the present invention according to one aspect is to provide a magnetization characteristic detection device for a magnetic material that can not only measure the amount of a magnetic material but also obtain a magnetization characteristic curve using a magnetic material analysis device based on FMMD (Frequency Mixing Magnetic Detection).

[0017] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems can be clearly understood by those skilled in the art from the description of the invention below. means of solving the problem

[0018] A magnetization characteristic detection device for a magnetic material according to one aspect of the present invention comprises: a high-frequency generation module that generates and outputs a high-frequency signal to a high-frequency transmitting coil of a Frequency Mixing Magnetic Detection (FMMD) coil; a low-frequency generation module that generates and outputs a low-frequency signal to a low-frequency transmitting coil of the FMMD coil; a low-frequency detection module that measures a loopback signal of a low-frequency signal applied to a low-frequency transmitting coil; a variable frequency filter that adjusts the phase of a magnetization signal detected from a detection coil of the FMMD coil; and a magnetization signal detection module that detects a magnetization signal filtered through a variable frequency filter. The apparatus comprises a processor operatively coupled to a high-frequency generation module, a low-frequency generation module, a low-frequency detection module, a variable frequency filter, and a magnetization signal detection module; wherein the processor drives one or more of the high-frequency generation module and the low-frequency generation module according to a detection mode input from an input / output module, and generates an amount of magnetic material and a magnetization characteristic curve based on signals detected through the low-frequency detection module, the variable frequency filter, and the magnetization signal detection module.

[0019] In the present invention, the FMMD coil is characterized by comprising: a low-frequency transmitting coil that receives a low-frequency signal and generates an alternating magnetic field; a high-frequency transmitting coil wound inside the low-frequency transmitting coil that receives a high-frequency signal and generates an alternating magnetic field; and a detection coil wound inside the high-frequency transmitting coil that detects the magnetization state of a magnetic material located inside a bobbin by the alternating magnetic field.

[0020] In the present invention, the detection coil is characterized by comprising an upper detection coil and a lower detection coil, each having coils with opposite winding directions and the same number of windings, wound on the upper and lower parts of a bobbin, respectively.

[0021] In the present invention, the magnetization signal detection module is characterized by detecting a magnetization signal from either an upper detection coil or a lower detection coil.

[0022] In the present invention, the processor is characterized by detecting the amount of magnetic material by analyzing the strengths of two alternating magnetic field harmonics detected through a magnetization signal detection module after operating a high-frequency generation module and a low-frequency generation module in the magnetic material amount detection mode.

[0023] In the present invention, the processor is characterized by detecting a magnetization characteristic curve by operating a low-frequency generation module and adjusting the phase through a variable frequency filter, while measuring the strength of the magnetic field through the strength of the magnetization measured by the magnetization signal detection module and the loopback signal of the low-frequency signal measured by the low-frequency detection module, in the case of a magnetization characteristic curve detection mode. Effects of the invention

[0024] A magnetization characteristic detection device for a magnetic material according to one aspect of the present invention utilizes a magnetic material analysis device based on FMMD (Frequency Mixing Magnetic Detection) to not only measure the amount of a magnetic material but also acquire a magnetization characteristic curve, thereby enabling two functions to be performed with a single device, making it efficient and reducing the operating costs of the device.

[0025] However, the effects obtainable through the present invention are not limited to those described above, and other unmentioned technical effects will be clearly understood by those skilled in the art from the description of the invention below. Brief explanation of the drawing

[0026] FIG. 1 is a block diagram showing a device for detecting the magnetization characteristics of a magnetic material according to one embodiment of the present invention. FIG. 2 is a graph showing a signal measured by a magnetization characteristic detection device of a magnetic material according to one embodiment of the present invention. FIG. 3 is a flowchart illustrating a method for detecting the magnetization characteristics of a magnetic material according to one embodiment of the present invention. Specific details for implementing the invention

[0027] Hereinafter, an example of a device for detecting the magnetization characteristics of a magnetic material according to one embodiment of the present invention will be described.

[0028] In this process, the thickness of lines or the size of components depicted in the drawings may be exaggerated for the sake of clarity and convenience of explanation. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intent or convention of the user or operator. Therefore, the definitions of these terms should be based on the content throughout this specification.

[0029] Embodiments of the present invention are described below with reference to the attached drawings so that those skilled in the art can easily implement them. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals.

[0030] Throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0031] The implementations described herein may be implemented, for example, as methods or processes, devices, software programs, data streams, or signals. Even if discussed only in the context of a single form of implementation (e.g., discussed only as a method), the implementation of the discussed features may also be implemented in other forms (e.g., devices or programs). Devices may be implemented in appropriate hardware, software, and firmware, etc. Methods may be implemented in devices such as processors, which generally refer to processing devices including, for example, computers, microprocessors, integrated circuits, or programmable logic devices.

[0032] FIG. 1 is a block diagram showing a magnetization characteristic detection device of a magnetic material according to one embodiment of the present invention, and FIG. 2 is a graph showing a signal measured by a magnetization characteristic detection device of a magnetic material according to one embodiment of the present invention.

[0033] As illustrated in FIG. 1, a magnetization characteristic detection device for a magnetic material according to one embodiment of the present invention may include an FMMD coil (100), a high-frequency generation module (40), a low-frequency generation module (50), a low-frequency detection module (60), a variable frequency filter (70), a magnetization signal detection module (80), an input / output module (10), a memory (20), and a processor (30).

[0034] The FMMD coil (100) may include a low-frequency transmitting coil (120) that receives a low-frequency signal and generates an alternating magnetic field, a high-frequency transmitting coil (110) that is wound inside the low-frequency transmitting coil (120) and receives a high-frequency signal and generates an alternating magnetic field, and a detection coil (130) that is wound inside the high-frequency transmitting coil (110) and detects the magnetization state of a magnetic material (200) located inside a bobbin by the alternating magnetic field.

[0035] At this time, the detection coil (130) may be composed of an upper detection coil (132) and a lower detection coil (134), each having an opposite winding direction and the same number of windings, wound on the upper and lower parts of the bobbin, respectively.

[0036] In this way, the detection coil (130) is formed with a differential structure so that it can eliminate alternating magnetic fields coming from the outside, such as the high-frequency transmission coil (110) and the low-frequency transmission coil (120), thereby enabling it to acquire only the signal of the magnetic material (200) to be measured.

[0037] The high-frequency generation module (40) can generate an alternating magnetic field by generating and outputting a high-frequency signal to the high-frequency transmission coil (110) of the FMMD (Frequency Mixing Magnetic Detection) coil (100).

[0038] At this time, the high-frequency generation module (40) may include an amplifier to amplify and output the generated high-frequency signal.

[0039] The low-frequency generation module (50) can generate an alternating magnetic field by generating and outputting a low-frequency signal to the low-frequency transmission coil (120) of the FMMD coil (100).

[0040] At this time, the low-frequency generation module (50) may include an amplifier to amplify and output a low-frequency signal.

[0041] In this case, the high-frequency and low-frequency signals are alternating current signals, and the high-frequency and low-frequency signals indicate the magnitude of their frequencies relative to one another.

[0042] The low-frequency detection module (60) can monitor the strength of the magnetic field by measuring the loopback signal of the low-frequency signal applied to the low-frequency transmission coil (120).

[0043] The magnetic field strength can be obtained in the magnetization characteristic curve detection mode through the loopback signal of the low-frequency signal measured in this way.

[0044] The variable frequency filter (70) can adjust the phase of the magnetization signal detected from the detection coil (130) of the FMMD coil (100).

[0045] The magnetization signal detection module (80) can detect a magnetization signal filtered through a variable frequency filter (70).

[0046] At this time, it is preferable for the variable frequency filter (70) and the magnetization signal detection module (80) to detect a magnetization signal from either the upper detection coil (132) or the lower detection coil (134).

[0047] The magnetic field generated by the magnetic material (200) in the magnetization signal detection module (80) can be measured as an induced voltage in a differentiated form in the detection coil (130), and by integrating the induced voltage signal measured in this way, the magnetization strength of the magnetization characteristic curve (MH curve) can be obtained.

[0048] At this time, the phase of the magnetization signal detected through the variable frequency filter (70) can be adjusted to match the phase of the magnetization intensity and the magnitude of the magnetic field.

[0049] The input / output module (10) can input a detection mode for operating the magnetic material magnetization characteristic detection device as a means for a user interface, and can input a setting value or a command. In addition, the input / output module (10) can output the detection result of the magnetic material magnetization characteristic detection device.

[0050] For example, the input / output module (10) may include a device such as a microphone, keyboard, or mouse for input, and a device such as a display or speaker for output. As another example, the input / output module (10) may include a device in which the functions for input and output are integrated into one, such as a touchscreen.

[0051] The memory (20) can store an execution program and related data for a device for detecting the magnetization characteristics of a magnetic material, and the stored information can be selected by the processor (30) as needed.

[0052] That is, various types of data and commands generated during the execution of an operating system (O / S) or application (program or applet) for driving a device for detecting the magnetization characteristics of a magnetic material are stored in the memory (20). At this time, the memory (20) can be implemented as a non-volatile memory, a volatile memory, a flash memory, or a solid-state drive (SSD). In addition, the memory (20) is accessed, and data reading / writing / modification / deletion / updating by the processor (30) can be performed.

[0053] The processor (30) is operatively coupled to the high-frequency generation module (40), low-frequency generation module (50), low-frequency detection module (60), variable frequency filter (70), magnetization signal detection module (80), input / output module (10), and memory (20) to control the overall operation of the magnetization characteristic detection device of a magnetic material, and can perform various operations by copying and executing various programs stored in memory (20) into RAM.

[0054] Here, although the processor (30) is described as including only one CPU, it may be implemented with multiple CPUs (or DSP, SoC, etc.) during implementation.

[0055] In various embodiments, the processor (30) may be implemented as a digital signal processor (DSP) that processes digital signals, a microprocessor, or a time controller (TCON). However, it is not limited thereto, and the processor (30) may include one or more of a central processing unit (CPU), a micro controller unit (MCU), a micro processing unit (MPU), a controller, an application processor (AP), a communication processor (CP), or an ARM processor, or may be defined by such terms. Additionally, the processor (30) may be implemented as a System on Chip (SoC) or a large-scale integration (LSI) with a built-in processing algorithm, or may be implemented in the form of a Field Programmable Gate Array (FPGA).

[0056] That is, the processor (30) executes an execution program stored in memory (20), then drives one or more of the high-frequency generation module (40) and the low-frequency generation module (50) according to the detection mode input from the input / output module (10), and can generate an amount of magnetic material (200) and a magnetization characteristic curve (MH curve) based on the signal detected through the low-frequency detection module (60), the variable frequency filter (70), and the magnetization signal detection module (80).

[0057] When the processor (30) receives a magnetic material quantity detection mode from the input / output module (10), it operates the high-frequency generation module (40) and the low-frequency generation module (50) to output a high-frequency signal to the high-frequency transmission coil (110) of the FMMD (Frequency Mixing Magnetic Detection) coil (100) and outputs a low-frequency signal to the low-frequency transmission coil (120) of the FMMD coil (100), thereby detecting the amount of magnetic material (200) by analyzing the intensity of the harmonics measured through the magnetization signal detection module (80) for the signal of the magnetic material that responds to the two alternating magnetic fields generated by the two frequencies, and then outputs the amount of magnetic material (200) through the input / output module (10).

[0058] Additionally, when a magnetization characteristic curve detection mode is input from the input / output module (10), the processor (30) can detect the magnetization characteristic curve by operating the low-frequency generation module (40), adjusting the phase through the variable frequency filter (70), and measuring the magnetic field strength through the magnetization strength measured by the magnetization signal detection module (80) and the loopback signal of the low-frequency signal measured by the low-frequency detection module (60).

[0059] That is, the processor (30) operates the low-frequency generation module (50) to apply a low-frequency signal to the low-frequency transmission coil (120) as in (a) of FIG. 2, and then measures the peak from the loopback signal of the low-frequency signal measured by the low-frequency detection module (60) to extract the strength and period of the magnetic field.

[0060] Additionally, the processor (30) measures the peak from the integral signal of the magnetization signal detected through the magnetization signal detection module (80) and extracts the intensity and period of the magnetization signal as shown in (b) of FIG. 2. At this time, the magnetization signal detected by the detection coil (130) is detected in a differential form.

[0061] Afterward, the processor (30) can generate a magnetization characteristic curve by adjusting the phase of the magnetization signal through a variable frequency filter (70) as in (c) of FIG. 2 to match the phase of the magnetic field and the phase of the magnetization signal.

[0062] The processor (30) can output the generated magnetization characteristic curve through the input / output module (10).

[0063] As described above, according to the magnetization characteristic detection device of a magnetic material according to an embodiment of the present invention, by using a magnetic material analysis device based on FMMD (Frequency Mixing Magnetic Detection), it is possible to not only measure the amount of magnetic material but also obtain a magnetization characteristic curve, thereby enabling two functions to be performed with a single device, which is efficient and can reduce the operating costs of the device.

[0064] FIG. 3 is a flowchart illustrating a method for detecting the magnetization characteristics of a magnetic material according to one embodiment of the present invention.

[0065] As illustrated in FIG. 3, in a method for detecting the magnetization characteristics of a magnetic material according to an embodiment of the present invention, first, a processor (30) executes an execution program stored in memory (20) and then receives a detection mode from an input / output module (10) (S10).

[0066] Here, the detection mode may include a magnetic material quantity detection mode for detecting the amount of magnetic material (200) that can be detected through a magnetic material magnetization characteristic detection device, and a magnetization characteristic curve detection mode for detecting a magnetization characteristic curve.

[0067] When the amount detection mode of magnetic material is input as the detection mode in step S10, the processor (30) operates the high-frequency generation module (40) and the low-frequency generation module (50) (S20).

[0068] After operating the high-frequency generation module (50) and the low-frequency generation module (40) in step S22, the processor (30) analyzes the intensity of the harmonics measured through the magnetization signal detection module (80) of the signal of the magnetic material (200) that responds to the two alternating magnetic fields generated by the high-frequency transmission coil (110) and the low-frequency transmission coil (120) (S22).

[0069] After analyzing the intensity of the harmonics in step S24, the processor (30) outputs the amount of magnetic material (200) detected by analyzing the intensity of the harmonics through the input / output module (10) (S24).

[0070] Meanwhile, if a magnetization characteristic curve detection mode is input as a detection mode in step S10, the processor (30) activates the low-frequency generation module (50) (S30).

[0071] After operating the low-frequency generation module (50) in step S30, the processor (30) measures the peak from the loopback signal of the low-frequency signal measured by the low-frequency detection module (60) and extracts the magnetic field strength and period (S32).

[0072] Additionally, the processor (30) operates the low-frequency generation module (50) in step S30 and then measures the peak from the integral signal of the magnetization signal detected through the magnetization signal detection module (80) to extract the intensity and period of the magnetization signal (S34).

[0073] Afterwards, the processor (30) adjusts the phase of the magnetization signal through a variable frequency filter (70) to match the phase of the magnetic field with the phase of the magnetization signal (S36).

[0074] In this way, after matching the phase of the magnetization signal and the phase of the magnetic field, the processor (30) generates a magnetization characteristic curve (MH curve) based on the relationship between the magnetic field strength and the strength of the magnetization signal and outputs it through the input / output module (10) (S38).

[0075] As described above, according to the method for detecting the magnetization characteristics of a magnetic material according to an embodiment of the present invention, by using a magnetic material analysis device based on FMMD (Frequency Mixing Magnetic Detection), it is possible to not only measure the amount of the magnetic material but also obtain a magnetization characteristic curve, thereby enabling two functions to be performed with a single device, which is efficient and can reduce the operating costs of the device.

[0076] Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom.

[0077] Therefore, the technical scope of protection of the present invention should be determined by the claims below. Explanation of the symbols

[0078] 10 : I / O module 20 : Memory 30 : Processor 40 : High-frequency generation module 50: Low-frequency generation module 60: Low-frequency detection module 70: Variable frequency filter 80: Magnetization signal detection module 100 : FMMD coil 110 : High-frequency transmitting coil 120 : Low-frequency transmitting coil 130 : Detecting coil 132 : Upper detection coil 134 : Lower detection coil 200 : Magnetic material

Claims

Claim 1 A high-frequency generation module that generates and outputs a high-frequency signal to a high-frequency transmission coil of an FMMD (Frequency Mixing Magnetic Detection) coil; a low-frequency generation module that generates and outputs a low-frequency signal to a low-frequency transmission coil of the FMMD coil; a low-frequency detection module that measures a loopback signal of the low-frequency signal applied to the low-frequency transmission coil; a variable frequency filter that adjusts the phase of a magnetization signal detected from a detection coil of the FMMD coil; and a magnetization signal detection module that detects the magnetization signal filtered through the variable frequency filter. A device for detecting the magnetization characteristics of a magnetic material, comprising: a processor operatively coupled to the high-frequency generation module, the low-frequency generation module, the low-frequency detection module, the variable frequency filter, and the magnetization signal detection module; wherein the processor drives one or more of the high-frequency generation module and the low-frequency generation module according to a detection mode input from an input / output module, and generates an amount of magnetic material and a magnetization characteristic curve based on a signal detected through the low-frequency detection module, the variable frequency filter, and the magnetization signal detection module.

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