Fault signal detection system of target equipment using resonance filter

Abstract

The present invention relates to a fault signal detection system of target equipment using a resonance filter, which can precisely detect a fault signal of a coil in the target equipment regardless of frequency resolution, and can greatly improve a signal-to-noise ratio. To this end, provided is a detection device which detects a fault signal that may occur in a target coil (30) of the target equipment, comprising: a tuning capacitor (150) which is connected in series between a coil power source (120) and a coil inductor (160) with respect to a coil power source (120), the coil inductor (160), and a coil resistor (180) of the target coil (30), and is capable of tuning a frequency of the resonance filter; and a matching capacitor (140) which is connected to the coil power source (120) in parallel and can be matched with the frequency of the resonance filter, and thereby, a signal-to-noise ratio (SNR) may be further increased when the fault signal in the frequency domain passes through the resonance filter.

Description

Abnormal signal detection system for target equipment using a resonant filter

[0001] The present invention relates to a fault signal detection system for target equipment using a resonant filter that can precisely detect a fault signal of a coil among target equipment regardless of frequency resolution and significantly improve the signal-to-noise ratio.

[0002] Figure 1 is a photograph of a superconducting coil wound with superconducting wire as an example of a target device and coil. As shown in Figure 1, the superconducting coil is a device that utilizes an AC magnetic field. However, due to the AC magnetic field, eddy currents are generated in this superconducting coil, and heat is generated depending on the area and intrinsic resistivity of the conductor. Therefore, these changes in resistance and heat generation phenomena must be continuously monitored.

[0003] However, if a fault signal occurs in the coil of such equipment, monitoring becomes impossible because the signal cannot be detected, ultimately leading to an accident in which the equipment is damaged.

[0004] FIG. 2a is an example of a signal pattern in which an abnormal signal occurs in the time domain among the prior art, and FIG. 2b is an example of a signal pattern in which an abnormal signal occurs in the frequency domain among the prior art. As illustrated in FIG. 2a and FIG. 2b, when an abnormal signal occurs in a specific region, the abnormal signal and the signal to be detected become mixed, causing the signal-to-noise ratio to be significantly degraded, resulting in a state where monitoring becomes impossible.

[0005] To address these conventional technologies, a resonant circuit as shown in FIG. 3 existed. FIG. 3 is an example of an RLC parallel resonant circuit for detecting abnormal signals among conventional technologies. As shown in FIG. 3, a separate resonant power source (12), capacitor (14), coil inductance (16), and resistor (18) had to be provided for the target equipment.

[0006] Conventional RLC parallel resonant circuits such as Fig. 3 had to be equipped with a separate resonant power source (12), capacitor (14), coil inductance (16), and resistor (18), which made the equipment complex and had the economic disadvantage of additional equipment purchase or manufacturing costs.

[0007] Prior art literature

[0008] Patent documents

[0009] (Patent Document 1) 1. Patent Registration No. 10-2202703 (Quench detection device, rotation system including the same, and method of operation of the rotation system),

[0010] (Patent Document 2) 2. Patent Publication No. 10-2012-0018725 (Quench detection system for superconducting current limiter).

[0011] Accordingly, the present invention has been devised to solve the above-mentioned problems, and the first objective of the present invention is to provide a fault signal detection system for target equipment using a resonant filter that can significantly improve time resolution regardless of frequency resolution to precisely detect fault signals of coils among target equipment and significantly improve the signal-to-noise ratio (SNR).

[0012] The second objective of the present invention is to provide an abnormal signal detection system for target equipment using a resonant filter that allows the AC power and inductor of the target equipment to be utilized without the need to add a separate AC power source or inductor.

[0013] The third objective of the present invention is to provide an abnormal signal detection system capable of detecting abnormal signals in a non-contact manner while being spaced apart from the target equipment.

[0014] The fourth objective of the present invention is to provide an abnormal signal detection system for target equipment using a resonant filter that can miniaturize the detection device and significantly improve the detection sensitivity of abnormal signals.

[0015] However, the technical problems to be solved by the present invention are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which the present invention belongs from the description below.

[0016] In addition, the present invention is intended to provide an abnormal signal detection system for target equipment using the resonant filter of the present invention.

[0017] [National R&D projects that supported this invention]

[0018] [Project ID] 1711199187

[0019] [Assignment No.] D300200

[0020] [Ministry Name] Ministry of Science and ICT

[0021] [Name of Project Management (Specialized) Agency] Korea Basic Science Institute

[0022] [Research Project Name] Korea Basic Science Institute Research Operational Expense Support (Major Project Expenses)

[0023] [Research Project Title] Development of Electromagnetic Material Property Measurement Equipment

[0024] [Name of Project Performing Organization] Korea Basic Science Institute

[0025] [Research Period] 2023.01.01~2023.12.31.

[0026] As a first embodiment for achieving the above technical problem, a detection device for detecting a fault signal that may occur in a target coil (30) of a target device is provided, wherein the device includes a coil power supply (120), a coil inductance (160), and a coil resistance (180) of the target coil (30), a tuning capacitor (150) connected in series between the coil power supply (120) and the coil inductance (160) and capable of tuning the frequency of the resonant filter; and a matching capacitor (140) connected in parallel with the coil power supply (120) and capable of matching the frequency of the resonant filter, thereby providing a fault signal detection device for a target device using a resonant filter, characterized in that the signal-to-noise ratio (SNR) increases further as the fault signal in the frequency domain passes through the resonant filter.

[0027] Optionally, the resonant filter is a band-pass filter.

[0028] Optionally, the tuning capacitor (150) and the matching capacitor (140) are determined to increase the Q-factor (Quality factor) of the bandpass filter.

[0029] As a second embodiment for achieving the above technical objective, a detection device for detecting an abnormal signal that may occur in a target coil (30) of a target device comprises: a coil power supply (120), a coil inductance, and a coil resistance (180) of the target coil (30), wherein the coil inductance is a primary coil inductance (160a) and a secondary coil has a secondary coil inductance (160b) corresponding to the primary coil inductance (160a); and a tuning capacitor (150) connected in series with the secondary coil inductance (160b) and capable of tuning the frequency of a resonant filter. An abnormal signal detection device for a target device using a resonant filter is provided, characterized by including a matching capacitor (140) connected in series with a tuning capacitor (150) and capable of matching the frequency of the resonant filter, so that the signal-to-noise ratio (SNR) of the abnormal signal in the frequency domain increases as it passes through the resonant filter.

[0030] Optionally, the secondary coil further includes a high-permeability ferromagnetic core to increase magnetic coupling with the target coil (30).

[0031] Optionally, the signal line resistance of the detection device is defined as the signal line resistance (220), and an abnormal signal can be detected from both ends of the signal line resistance (220).

[0032] Optionally, it may further include an AC amplifier (230) whose input terminals are respectively connected to both ends of a signal line resistor (220); a DC component removal filter (240) connected to the output terminal of the AC amplifier (230); and an LC filter (250) connected in parallel to the DC component removal filter (240).

[0033] Optionally, between the target coil (30) and the secondary coil, a primary coil electrically connected to the target coil (30) is further included, and magnetic coupling is formed between the mutually spaced primary coil and the secondary coil.

[0034] Optionally, the primary coil further includes a high-permeability ferromagnetic core to increase magnetic coupling with the secondary coil.

[0035] The objective of the present invention as described above is, in another category, a detection method using the aforementioned detection device, comprising: a step (S100) of measuring the sweep speed of the AC current flowing through the target coil (30) of the target equipment where an abnormal signal may occur; a step (S120) of extracting frequency components according to the sweep speed; a step (S140) of inputting the inductance (160) of the target coil (30); a step (S180) of completing a resonant filter by determining the values ​​of a tuning capacitor (150) and a matching capacitor (140) based on the frequency components and the inductance (160) (S160); a step (S200) of measuring the voltage signal of the target coil (30); a step (S220) of converting the voltage signal into the frequency domain using a Fast Fourier Transform; and a step (S240) of the signal in the frequency domain passing through the detection circuit (100, 100a) of the resonant filter. This can also be achieved by a method for detecting an abnormal signal of a target device using a resonant filter, characterized by including the step (S260) of outputting a signal of the detection circuit (100, 100a).

[0036] Optionally, in the determination step (S160), the values ​​of the tuning capacitor (150) and the matching capacitor (140) can be determined from the step of simulating a change in the resonant frequency according to a change in the matching capacitor (150) and the tuning capacitor (140); and the step of simulating a change in the Q-factor (Quality factor) according to a change in the matching capacitor (150) and the tuning capacitor (140).

[0037] According to the first embodiment of the present invention, the time resolution can be significantly improved regardless of the frequency resolution to precisely detect fault signals of coils among target equipment and to significantly improve the signal-to-noise ratio (SNR). That is, as the Q-coefficient increases, the signal-to-noise ratio (SNR) of the fault signal improves.

[0038] In addition, the detection device can be miniaturized because it can utilize the AC power and inductor of the target equipment without the need to add a separate AC power source or inductor.

[0039] In addition, according to the second, third, and fourth embodiments, abnormal signals can be detected in a non-contact manner, thereby enhancing the convenience of detection and the effect of maintaining the performance of the target equipment.

[0040] In addition, according to the fourth embodiment, the detection sensitivity of abnormal signals can be greatly improved, so the protection effect of the target equipment can be greatly enhanced.

[0041] However, the effects obtainable from the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description below.

[0042] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0043] FIG. 1 is a photograph of a superconducting coil wound with a superconducting wire, which is an example of a target device and coil.

[0044] FIG. 2a is an example of a signal pattern in which an abnormal signal occurs in the time domain among the prior art.

[0045] FIG. 2b is an example of a signal pattern in which an abnormal signal occurs in the frequency domain among the prior art.

[0046] FIG. 3 is an example of an RLC parallel resonant circuit for detecting abnormal signals among the prior art.

[0047] FIG. 4 is a circuit diagram of an abnormal signal detection device for target equipment using a resonant filter according to a first embodiment of the present invention,

[0048] Figure 5 is a graph of the transfer function of the resonant filter according to Figure 4,

[0049] FIG. 6a is a graph showing the result of a frequency tuning simulation for designing the resonant filter of the present invention,

[0050] FIG. 6b is a graph showing the result of a frequency matching simulation for designing a resonant filter of the present invention.

[0051] FIG. 6c is a graph of the preliminary detection result of the transfer function using the simulation results according to FIG. 6a and 6b,

[0052] FIG. 7 is a circuit diagram showing the relationship between the first embodiment of the present invention and the parallel resistor (200).

[0053] FIG. 8 is a flowchart schematically illustrating a method for detecting an abnormal signal of a target device using a resonant filter according to the present invention.

[0054] FIG. 9a is a circuit diagram showing the relationship between the first embodiment of the present invention and the signal parallel voltage (210).

[0055] FIG. 9b is an explanatory diagram showing the signal change according to FIG. 9a,

[0056] FIG. 10 is a circuit diagram of an abnormal signal detection device for target equipment using a resonant filter according to a second embodiment of the present invention,

[0057] FIGS. 11a and FIGS. 11b are graphs showing the transfer functions of the first and second embodiments of the present invention, respectively.

[0058] FIG. 12 is a circuit diagram of an abnormal signal detection device for target equipment using a resonant filter according to a third embodiment of the present invention,

[0059] FIG. 13 is a circuit diagram of an abnormal signal detection device for target equipment using a resonant filter according to the fourth embodiment of the present invention.

[0060] Below, with reference to the attached drawings, embodiments of the present invention are described in detail so that those skilled in the art can easily implement the invention. However, since the description of the present invention is merely an example for structural or functional explanation, the scope of the present invention should not be interpreted as being limited by the embodiments described in the text. That is, since the embodiments are subject to various modifications and may take various forms, the scope of the present invention should be understood to include equivalents capable of realizing the technical concept. Furthermore, the objectives or effects presented in the present invention do not imply that a specific embodiment must include all of them or only such effects; therefore, the scope of the present invention should not be understood as being limited by them.

[0061] The meaning of the terms described in this invention should be understood as follows.

[0062] Terms such as "first" and "second" are intended to distinguish one component from another, and the scope of rights shall not be limited by these terms. For example, the first component may be named the second component, and similarly, the second component may be named the first component. When a component is referred to as being "connected" to another component, it should be understood that it may be directly connected to that other component, or that there may be other components in between. Conversely, when a component is referred to as being "directly connected" to another component, it should be understood that there are no other components in between. Meanwhile, other expressions describing the relationship between components, such as "between" and "exactly between," or "adjacent to" and "directly adjacent to," shall be interpreted in the same manner.

[0063] A singular expression should be understood to include a plural expression unless the context clearly indicates otherwise, and terms such as "include" or "have" are intended to specify the existence of the set-up features, numbers, steps, actions, components, parts, or combinations thereof, and should be understood not to preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0064] Unless otherwise defined, all terms used herein have the same meaning as generally understood by those skilled in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having meanings consistent with the context of the relevant technology and should not be interpreted as having an ideal or overly formal meaning unless explicitly defined in this invention.

[0065] Composition of the first embodiment

[0066] Hereinafter, the configuration of the first embodiment will be described in detail with reference to the attached drawings. FIG. 4 is a circuit diagram of an abnormal signal detection device for target equipment using a resonant filter according to the first embodiment of the present invention. As shown in FIG. 4, the target coil (30) of the target equipment is equipped with a coil power source (120), a coil inductance (160), and a coil resistor (180). These coil power source (120), coil inductance (160), and coil resistor (180) are not configured separately but are already implemented in the target equipment.

[0067] In particular, the coil resistance (180) is the resistance of the coil itself that occurs when an abnormality occurs in the coil of the target equipment.

[0068] A tuning capacitor (150) is connected in series between the coil power supply (120) and the coil inductance (160) and can tune the frequency of the resonant filter.

[0069] And, the matching capacitor (140) is connected in parallel with the coil power supply (120) and can match the frequency of the resonant filter. That is, the coil power supply (120), the tuning capacitor (150), the coil inductance (160), and the coil resistor (180) are configured in series, and one end of the matching capacitor (140) is connected between the coil power supply (120) and the tuning capacitor (150), and the other end is grounded.

[0070] A resonant filter like the one in Fig. 4 is a band-pass filter, and a tuning capacitor (150) and a matching capacitor (140) are determined to increase the Q-factor (Quality factor) of the band-pass filter.

[0071] Figure 5 is a graph of the transfer function of the resonant filter according to Figure 4. As shown in Figure 5, as the frequency approaches the resonant frequency (fo), the bandwidth narrows and the Q-factor (Quality factor) increases, causing the amplitude to show a peak value.

[0072] FIG. 6a is a graph showing the result of a frequency tuning simulation for designing the resonant filter of the present invention. As shown in FIG. 6a, it can be seen that the resonant frequency increases (in red) as the capacitance of the matching capacitor (140) and the tuning capacitor (150) decreases (as it approaches 0). Therefore, the capacitance of the matching capacitor (140) and the tuning capacitor (150) can be determined using the xy-axis coordinate values ​​at the desired resonant frequency (fo) point.

[0073] FIG. 6b is a graph showing the result of a frequency matching simulation for designing the resonant filter of the present invention. As shown in FIG. 6b, it can be seen that a high (dark red hexagon) Q-coefficient is exhibited when the matching capacitor (140) is 60 pF and the tuning capacitor (150) is 20 pF. Therefore, the capacitance can be designed so that the matching capacitor (140) is close to 60 pF and the tuning capacitor (150) is close to 20 pF.

[0074] Simulations such as those in Figs. 6a and 6b can be implemented using a standard commercial simulation program (e.g., COMSOL Multiphysics or MATLAB).

[0075] Figure 6c is a graph of the preliminary detection result of the transfer function using the simulation results according to Figures 6a and 6b. As shown in Figure 6c, by measuring the transfer function from the simulation results of Figures 6a and 6b, it can be seen that the amplitude (dB) is minimized when the frequency is 3.96 Hz. That is, through this process, it is possible to set the band of the resonant frequency (fo).

[0076] FIG. 7 is a circuit diagram showing the relationship between the first embodiment of the present invention and the parallel resistor (200). As shown in FIG. 7, the parallel resistor (200) corresponds to the resistor (18) of the conventional RLC circuit shown in FIG. 3. In the first embodiment, there is only the coil resistance (180) of the coil itself, and the parallel resistor (200) is omitted when compared to the RLC circuit of FIG. 3.

[0077] FIG. 9a is a circuit diagram showing the relationship between the first embodiment of the present invention and the signal parallel voltage (210), and FIG. 9b is an explanatory diagram showing the signal change according to FIG. 9a. As shown in FIG. 9a and FIG. 9b, the signal analysis unit (B) includes the signal parallel voltage (210) applied across the coil inductance (160) and the coil resistance (180). That is, since the coil inductance (160) and the coil resistance (180) are virtual components, the signal parallel voltage (210) applied to the coil is measured and then subjected to a Fast Fourier Transform. Then, the signal in the frequency domain passes through a band-pass filter (the shape of the transfer function is adjustable) to improve the signal-to-noise ratio (SNR) of the abnormal signal. In other words, since only the resonant frequency component according to the AC sweep of the coil is used in the measurement of the abnormal signal, the time resolution can be improved by adjusting the window size regardless of the frequency resolution.

[0078] Operation of the first embodiment

[0079] Hereinafter, the operation of the first embodiment will be described in detail with reference to the attached drawings. FIG. 8 is a flowchart schematically illustrating a method for detecting an abnormal signal of a target device using a resonant filter according to the present invention. As shown in FIG. 8, first, the sweep speed of the AC current flowing through the target coil (30) of the target device, where an abnormal signal may occur, is measured (S100). The measured sweep speed is input into a computer and / or FFT.

[0080] Next, frequency components according to the sweep speed are extracted (S120).

[0081] Next, the inductance (160) of the target coil (30) is entered into the computer (S140).

[0082] The control unit of the computer determines the values ​​of the tuning capacitor (150) and the matching capacitor (140) based on the input frequency component and the inductance (160) (S160) to complete the resonant filter (S180). More specifically, the values ​​of the tuning capacitor (150) and the matching capacitor (140) are determined from the step of simulating the change in the resonant frequency according to the change in the matching capacitor (150) and the tuning capacitor (140) as shown in FIGS. 6a and 6b; and the step of simulating the change in the Q-factor (Quality factor) according to the change in the matching capacitor (150) and the tuning capacitor (140).

[0083] Next, as shown in FIG. 9a, the voltage signal of the target coil (30) (signal parallel voltage (210)) is measured (S200).

[0084] Next, the measured voltage signal is converted into the frequency domain by performing a Fast Fourier Transform (FFT) (S220).

[0085] Next, the signal in the frequency domain passes through the detection circuit (100, 100a) of the resonant filter shown in FIG. 4 (S240).

[0086] Next, the computer outputs a signal from the detection circuit (100, 100a) (S260). As shown in FIG. 9b, a high amplitude is prominently displayed at the resonant frequency (fo), so it is easy to recognize that an abnormal signal has occurred. Therefore, when a high amplitude as shown in FIG. 9b is output, the operator can immediately stop the operation of the target device or reduce its performance to prevent an accident.

[0087] Second embodiment

[0088] Hereinafter, a second embodiment will be described in detail with reference to the attached drawings. FIG. 10 is a circuit diagram of an abnormal signal detection device for target equipment using a resonant filter according to a second embodiment of the present invention. As shown in FIG. 10, similar to the first embodiment, regarding the coil power supply (120), coil inductance, and coil resistance (180) of the target coil (30), the coil inductance is defined as the primary coil inductance (160a). The primary coil inductance (160a) is the self-inductance of the target equipment coil and does not require additional configuration.

[0089] The secondary coil of the detection device (100a) has a secondary coil inductance (160b) corresponding to the primary coil inductance (160a). The secondary coil is spaced apart from the target coil (30) of the target equipment so as to be close to it so that magnetic field coupling is achieved. The secondary coil is a pickup coil for detecting abnormal signals of the target coil (30) by utilizing back electromotive force. The secondary coil includes a high-permeability ferromagnetic core to increase magnetic coupling with the target coil (30).

[0090] The tuning capacitor (150) is connected in series with the secondary coil inductance (160b) and can tune the frequency of the resonant filter. The matching capacitor (140) is connected in series with the tuning capacitor (150) and can match the frequency of the resonant filter.

[0091] And, the signal line resistance (220) is defined as the signal line resistance of the detection device (100a), and an abnormal signal is detected from both ends of the signal line resistance (220).

[0092] The detection device (100a) illustrated in FIG. 10 can be configured as a portable, small device. For example, the secondary inductance (160b) can be implemented as a small pickup coil, the matching capacitor (140) and the tuning capacitor (150) can be implemented as a trimmer variable capacitor, and the control unit of the computer can be implemented as a microcontroller, CPU, AP (application processor), or Arduino-based control unit.

[0093] In particular, the detection device (100a) is small and has a slim rectangular shape so that it can be installed on a measuring rack, and can be made of a non-magnetic material.

[0094] FIG. 11a is a graph showing the transfer function of the first embodiment, and FIG. 11b is a graph showing the transfer function of the second embodiment. Since the graphs in FIG. 11a and FIG. 11b are almost identical, it can be confirmed that there is no significant change in the characteristics of the transfer function even when modified to a non-contact type as in the second embodiment.

[0095] Third embodiment

[0096] Hereinafter, a third embodiment will be described in detail with reference to the attached drawings. FIG. 12 is a circuit diagram of an abnormal signal detection device for target equipment using a resonant filter according to the third embodiment of the present invention. As shown in FIG. 12, in order to increase the detection sensitivity of the abnormal signal detection unit, the input terminal of the AC amplifier (230) is connected to both ends of the signal line resistor (220), and the output terminal is connected to a DC component removal filter (240).

[0097] The DC component removal filter (240) is a capacitor connected between the AC amplifier (230) and the LC filter (250).

[0098] The LC filter (250) is connected to the DC component removal filter (240) in a configuration where an inductor and a capacitor are connected in parallel.

[0099] As illustrated in FIG. 12, the amplitude of the abnormal signal through the signal line resistor (220) is increased by the AC amplifier (230). Then, the DC component removal filter (240) removes the DC component of the measurement signal. Then, the LC filter (250) increases the Q-coefficient of the transfer function. Through this third embodiment, the detection sensitivity of the abnormal signal detection unit can be further increased.

[0100] 4th embodiment

[0101] Hereinafter, a fourth embodiment will be described in detail with reference to the attached drawings. FIG. 13 is a circuit diagram of an abnormal signal detection device for target equipment using a resonant filter according to the fourth embodiment of the present invention. As shown in FIG. 13, the primary coil is electrically connected to the target coil (30) between the target coil (30) and the secondary coil. Magnetic coupling is formed between the primary coil and the secondary coil that are spaced apart from each other.

[0102] In addition, the primary coil and the secondary coil include a high-permeability ferromagnetic core to increase mutual magnetic coupling.

[0103] As described above, the detailed description of the preferred embodiments of the present invention disclosed is provided to enable those skilled in the art to implement and practice the present invention. Although the present invention has been described with reference to preferred embodiments, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the scope of the invention. For example, those skilled in the art may utilize each configuration described in the embodiments described above in combination with one another. Accordingly, the present invention is not intended to be limited to the embodiments shown herein, but to be given the broadest scope consistent with the principles and novel features disclosed herein.

[0104] The present invention may be embodied in other specific forms without departing from the spirit and essential features of the invention. Accordingly, the above detailed description should not be interpreted restrictively in all respects but should be considered exemplary. The scope of the invention shall be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the invention are included within the scope of the invention. The invention is not intended to be limited to the embodiments shown herein, but to be given the broadest possible scope consistent with the principles and novel features disclosed herein. Furthermore, embodiments may be constructed by combining claims that are not explicitly related in the claims, or by including them as new claims through amendments made after filing.

[0105] Explanation of the symbols

[0106] 10 : RLC circuit,

[0107] 12 : Resonant power source (AC),

[0108] 14 : Capacitor (C),

[0109] 16 : Inductance (L),

[0110] 18 : Resistance (R),

[0111] 30 : Target coil,

[0112] 100 : Detector circuit,

[0113] 100a, 100b : Remote detection circuit,

[0114] 120 : Coil power (AC'),

[0115] 140 : Matching capacitor (C M ),

[0116] 150 : Tuning capacitor (C T ),

[0117] 160 : Coil inductance (L),

[0118] 160a : Primary coil inductance (L1),

[0119] 160b : Secondary coil inductance (L2),

[0120] 180 : Coil resistance (R f ),

[0121] 200 : Parallel resistor (R L ),

[0122] 210 : Signal parallel voltage (V L ),

[0123] 220 : Signal line resistance (R S ),

[0124] 230 : AC amplifier,

[0125] 240 : DC component removal filter,

[0126] 250 : LC filter,

[0127] 300 : Detector,

[0128] A : Removable parallel resistor,

[0129] B: Signal Analysis Unit,

[0130] fo : Resonance frequency.

Claims

1. A detection device for detecting an abnormal signal (Fault signal) that may occur in the target coil (30) of the target equipment, Regarding the coil power supply (120), coil inductance (160), and coil resistance (180) of the above target coil (30), A tuning capacitor (150) connected in series between the coil power supply (120) and the coil inductance (160) and capable of tuning the frequency of the resonant filter; and By including a matching capacitor (140) connected in parallel with the coil power supply (120) and capable of matching the frequency of the resonant filter, An abnormal signal detection device for target equipment using a resonant filter, characterized in that the signal-to-noise ratio (SNR) of the abnormal signal in the frequency domain increases as it passes through the resonant filter.

2. In Paragraph 1, An abnormal signal detection device for target equipment using a resonant filter, characterized in that the above resonant filter is a band-pass filter.

3. In Paragraph 2, An abnormal signal detection device for target equipment using a resonant filter, characterized in that the tuning capacitor (150) and the matching capacitor (140) are determined such that the Q-factor (Quality factor) of the bandpass filter increases.

4. A detection device for detecting an abnormal signal that may occur in the target coil (30) of the target equipment, With respect to the coil power supply (120), coil inductance, and coil resistance (180) of the above target coil (30), the coil inductance is set as the primary coil inductance (160a), and A secondary coil having a secondary coil inductance (160b) corresponding to the primary coil inductance (160a); A tuning capacitor (150) connected in series with the secondary coil inductance (160b) above and capable of tuning the frequency of the resonant filter; and By including a matching capacitor (140) connected in series with the tuning capacitor (150) and capable of matching the frequency of the resonant filter, An abnormal signal detection device for target equipment using a resonant filter, characterized in that the signal-to-noise ratio (SNR) of the abnormal signal in the frequency domain increases as it passes through the resonant filter.

5. In Paragraph 4, An abnormal signal detection device for target equipment using a resonant filter, characterized in that the above resonant filter is a band-pass filter.

6. In Paragraph 5, An abnormal signal detection device for target equipment using a resonant filter, characterized in that the tuning capacitor (150) and the matching capacitor (140) are determined such that the Q-factor (Quality factor) of the bandpass filter increases.

7. In Paragraph 4, An abnormal signal detection device for target equipment using a resonant filter, characterized in that the secondary coil further includes a high-permeability ferromagnetic core to increase magnetic coupling with the target coil (30).

8. In Paragraph 4, The signal line resistance of the above detection device is defined as the signal line resistance (220), and An abnormal signal detection device for a target device using a resonant filter, characterized by detecting the abnormal signal from both ends of the signal line resistor (220).

9. In Paragraph 8, AC amplifier (230) having input terminals connected to each of the signal line resistors (220); A DC component removal filter (240) connected to the output terminal of the AC amplifier (230); and An abnormal signal detection device for target equipment using a resonant filter, characterized by further including an LC filter (250) connected in parallel to the DC component removal filter (240).

10. In Paragraph 4, Between the target coil (30) and the secondary coil, further including a primary coil electrically connected to the target coil (30), An abnormal signal detection device for target equipment using a resonant filter, characterized by magnetic coupling being formed between the primary coil and the secondary coil that are spaced apart from each other.

11. In Paragraph 10, An abnormal signal detection device for target equipment using a resonant filter, characterized in that the primary coil further includes a high-permeability ferromagnetic core to increase magnetic coupling with the secondary coil.

12. A detection method using a detection device according to any one of claims 1 to 11, A step (S100) of measuring the sweep speed of the AC current flowing through the target coil (30) of the target equipment where an abnormal signal may occur; Step (S120) of extracting frequency components according to the sweep speed above; Step (S140) of inputting the inductance (160) of the target coil (30); A step (S180) of completing a resonant filter by determining the values ​​of a tuning capacitor (150) and a matching capacitor (140) based on the above frequency component and the above inductance (160) (S160); Step (S200) of measuring the voltage signal of the target coil (30); A step of converting the above voltage signal into the frequency domain using Fast Fourier Transform (S220); A step (S240) in which a signal in the frequency domain passes through the detection circuit (100, 100a) of the resonant filter; and A method for detecting an abnormal signal of a target device using a resonant filter, characterized by including the step (S260) of outputting a signal of the detection circuit (100, 100a).

13. In Paragraph 12, In the above determination step (S160), the values ​​of the tuning capacitor (150) and the matching capacitor (140) A step of simulating a change in resonance frequency according to a change in the matching capacitor (150) and the tuning capacitor (140); and A method for detecting abnormal signals in target equipment using a resonant filter, characterized by being determined from the step of simulating a change in the Q-factor (Quality factor) according to the change in the matching capacitor (150) and the tuning capacitor (140).

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