Self-adaptive active adjustment type magnetic shielding device degaussing circuit and device

Abstract

The invention relates to the technical field of magnetic shielding, and discloses a self-adaptive active adjustment type magnetic shielding device demagnetization circuit and device, and a control acquisition system, which are used for comparing a residual magnetism state with a preset expected value and generating a control instruction; the energy output identification system is used for outputting an alternating current degaussing signal according to the control instruction to perform degaussing, outputting an excitation pulse signal to perform residual magnetism detection, identifying a zero crossing point of the alternating current degaussing signal and realizing mode switching of degaussing and residual magnetism detection; and the magnetic shielding device is used for demagnetizing under the action of the alternating current demagnetizing signal and feeding back the residual magnetism state of the preset feature point under the action of the excitation pulse signal. The demagnetization is interrupted at the preset feature points in the demagnetization process, the real-time residual magnetism state is collected, and the demagnetization parameter at the next moment is adjusted after the real-time residual magnetism state is compared with the preset residual magnetism expected value, so that the problem of low efficiency due to the fact that the demagnetization parameter needs to be reset after the process is finished is solved, and the demagnetization efficiency and accuracy are greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of magnetic shielding space, in particular to a self-adaptive active adjustment type magnetic shielding device demagnetization circuit and device. BACKGROUND

[0002] With the in-depth application of magnetic shielding technology in high-end scientific research, precision manufacturing and other fields, the influence of demagnetization circuit on the performance of magnetic shielding device is increasingly critical, and the demagnetization efficiency and precision directly determine the stability of the shielding effect. The application scene is expanding towards large-scale and complex, and higher requirements are put forward for dynamic adjustment capability.

[0003] In related technologies, the demagnetization circuit mostly adopts open-loop control mode, and the parameters cannot be adjusted in real time during the demagnetization process. Only after the demagnetization is completed, the parameters are re-set according to the measurement results, resulting in low efficiency. Therefore, how to realize dynamic adjustment of the demagnetization process through real-time feedback and improve the performance of the demagnetization circuit has become a technical problem to be solved. SUMMARY

[0004] Therefore, the present application provides a self-adaptive active adjustment type magnetic shielding device demagnetization circuit and device to solve the problem of how to realize dynamic adjustment of the demagnetization process through real-time feedback and improve the performance of the demagnetization circuit.

[0005] In one aspect, the present disclosure provides a self-adaptive active adjustment type magnetic shielding device demagnetization circuit, which comprises a control acquisition system, a magnetic shielding device and an energy output identification system. The control acquisition system is connected with the energy output identification system, and the energy output identification system is connected with the magnetic shielding device. The control acquisition system is used to interrupt demagnetization at preset feature points in the demagnetization process, acquire the residual magnetism state of the preset feature points on the magnetic shielding device, the demagnetization process electric signal and the excitation pulse signal of the energy output identification system at the current time, compare the residual magnetism state with the preset residual magnetism expected value in the feature point residual magnetism judgment basis library, and generate a control instruction for adjusting the demagnetization parameters at the next time. The energy output identification system is used to output an alternating current demagnetization signal for demagnetization and an excitation pulse signal for residual magnetism detection according to the control instruction, identify the voltage zero-crossing point and the current zero-crossing point of the alternating current demagnetization signal, and realize mode switching of demagnetization and residual magnetism detection based on the zero-crossing points. The magnetic shielding device is used to demagnetize under the action of the alternating current demagnetization signal, and feed back the residual magnetism state of the preset feature points under the action of the excitation pulse signal.

[0006] In another aspect, the present disclosure also provides a self-adaptive active adjustment type magnetic shielding device demagnetization device, which comprises the self-adaptive active adjustment type magnetic shielding device demagnetization circuit described above.

[0007] The adaptive active adjustment type magnetic shielding device demagnetization circuit and device of the above-mentioned embodiments of the present disclosure can interrupt demagnetization at preset characteristic points in the demagnetization process and collect real-time residual magnetism states, adjust demagnetization parameters at the next time after comparison with preset residual magnetism expected values, solve the low efficiency problem that demagnetization parameters need to be reset after the process ends, and greatly improve demagnetization efficiency and accuracy. With the help of energy output identification system to identify the zero-crossing points of alternating demagnetization signal voltage and current, the accurate switching of demagnetization and residual magnetism detection modes is realized, ensuring that residual magnetism measurement is carried out under the condition of no external energy interference, and combining the feedback of the magnetic shielding device on the characteristic point residual magnetism state, the accuracy of residual magnetism detection is improved, and a reliable basis is provided for parameter adjustment.

[0008] In addition, through the closed-loop feedback mechanism and dynamic parameter adjustment, the characteristics of different magnetic shielding devices and diversified demagnetization requirements can be adapted, especially for large or complex structure magnetic shielding devices, manual intervention can be reduced, the stability and reliability of demagnetization effect can be ensured, and the application scenarios of magnetic shielding technology in the precision field are expanded. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present disclosure, the drawings needed to be used in the specific embodiments or related technology description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art without creating laborious work.

[0010] Figure 1 is an exemplary schematic diagram of a specific architecture of an adaptive active adjustment type magnetic shielding device demagnetization circuit of an embodiment of the present disclosure; Figure 2 is an exemplary schematic diagram of a specific architecture of an adaptive active adjustment type magnetic shielding device demagnetization circuit of an embodiment of the present disclosure; Figure 3 is an exemplary schematic diagram of a specific architecture of an adaptive active adjustment type magnetic shielding device demagnetization circuit of an embodiment of the present disclosure; Figure 4 is an exemplary schematic diagram of a specific architecture of an adaptive active adjustment type magnetic shielding device demagnetization circuit of an embodiment of the present disclosure; Figure 5 is an exemplary schematic diagram of the action process of an adaptive active modulation magnetic shielding device 102 in an adaptive active adjustment type magnetic shielding device demagnetization circuit of an embodiment of the present disclosure; Figure 6 is an exemplary schematic diagram of a specific architecture of an adaptive active adjustment type magnetic shielding device demagnetization circuit of an embodiment of the present disclosure; Figure 7is an exemplary schematic diagram of a specific architecture of a demagnetization circuit of another adaptive active adjustment type magnetic shielding device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0011] With the in-depth application of magnetic shielding technology in high-end scientific research, precision manufacturing and other fields, the influence of the demagnetization circuit on the performance of the magnetic shielding device is increasingly critical, and the demagnetization efficiency and precision directly determine the stability of the shielding effect. The application scenarios are expanding towards large-scale and complex, and higher requirements are put forward for dynamic adjustment capability.

[0012] In the first related technology, a magnetic shielding device active demagnetization method is disclosed, which generates a closed magnetic field by winding a demagnetization coil, and uses a demagnetization power supply to generate an alternating oscillation current with gradually decreasing amplitude, so that the demagnetization coil generates an alternating oscillation magnetic field and flows along a circular orientation to achieve demagnetization.

[0013] However, the first related technology has the following problems: 1. The demagnetization method uses a circular bidirectional current, and does not involve an adaptive adjustment mechanism based on closed-loop feedback. The demagnetization parameters cannot be dynamically adjusted according to the real-time state, resulting in low efficiency.

[0014] Further, the second related technology involves a demagnetization scheme for a magnetic shielding device, which supplies power to the demagnetization coil through a drive circuit. Some schemes use a closed-loop feedback mechanism, or achieve demagnetization by attenuating the oscillation current in stages. In the second related technology, there are the following problems: Dependence on spatial magnetic field measurement devices (such as magnetic sensors) to monitor the internal space magnetic field in real time requires the arrangement of a large number of sensors, which is costly and not suitable for large devices. It does not distinguish between the calibration stage and the running stage, and relies on spatial magnetic field detection throughout the process. The targeting and efficiency of parameter adjustment during the demagnetization process are insufficient.

[0015] Further, the third related technology discloses that high-precision demagnetization current output is achieved by establishing a mathematical model and designing a composite controller, and the fourth related technology discloses that the demagnetization parameters are adjusted by collecting the remanence on the surface of the magnetic shielding layer and the internal space magnetic field feedback. In the third and fourth related technologies, there are the following problems: No interrupt detection mechanism is set during the demagnetization process, and the remanence of the feature point cannot be measured in real time by active injection during the demagnetization process; The closed-loop adjustment logic is not designed for the dynamic process of interruption + feature point detection + parameter adaptive adjustment during demagnetization, and the real-time performance and precision of the demagnetization parameter adjustment are limited.

[0016] To solve the above problems, an adaptive active adjustment type magnetic shielding device demagnetization circuit is provided in various embodiments of the present disclosure. The circuit comprises: a control acquisition system, a magnetic shielding device, and an energy output identification system; the control acquisition system is connected with the energy output identification system, and the energy output identification system is connected with the magnetic shielding device; the control acquisition system is used to interrupt demagnetization at preset feature points in the demagnetization process, acquire the residual magnetism state of the preset feature points on the magnetic shielding device at the current time, the demagnetization process electric signal of the energy output identification system, and the excitation pulse signal, compare the residual magnetism state with the preset residual magnetism expected value in the feature point residual magnetism judgment basis library, and generate a control instruction for adjusting the demagnetization parameters at the next time; the energy output identification system is used to output an alternating current demagnetization signal for demagnetization and an excitation pulse signal for residual magnetism detection according to the control instruction, identify the voltage zero-crossing point and the current zero-crossing point of the alternating current demagnetization signal, and realize mode switching of demagnetization and residual magnetism detection based on the zero-crossing points; and the magnetic shielding device is used to demagnetize under the action of the alternating current demagnetization signal, and feed back the residual magnetism state of the preset feature points under the action of the excitation pulse signal.

[0017] To make the purpose, technical scheme and advantages of the embodiments of the present disclosure clearer, the technical scheme in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present disclosure.

[0018] Please refer to Figure 1 , Figure 1 is an exemplary schematic diagram of the architecture of an adaptive active adjustment type magnetic shielding device demagnetization circuit according to an embodiment of the present disclosure. As shown in Figure 1 , the adaptive active adjustment type magnetic shielding device demagnetization circuit 100 comprises a control acquisition system 101, a magnetic shielding device 102, and an energy output identification system 103, the control acquisition system 101 is connected with the energy output identification system 103, and the energy output identification system 103 is connected with the magnetic shielding device 102.

[0019] Among them, the control acquisition system 101 is the decision and perception center of the adaptive active adjustment type magnetic shielding device demagnetization circuit 100, which is used for interruption control, signal acquisition, data analysis, and parameter adjustment instruction generation of the demagnetization process.

[0020] The magnetic shielding device 102 is the action object of the demagnetization operation of the adaptive active adjustment type magnetic shielding device demagnetization circuit 100, specifically refers to the magnetic shielding structure (such as magnetic shielding cabin, magnetic shielding room, etc.) that needs to eliminate residual magnetism, and can contain multiple shielding layers.

[0021] The energy output recognition system 103 is an execution and signal generation center of the adaptive active magnetic shielding device demagnetization circuit 100, and is specifically configured to output demagnetization and detection signals according to control instructions, and to realize switching between the demagnetization and residual magnetism detection modes.

[0022] The control collection system 101 is configured to interrupt demagnetization at the preset characteristic points in the demagnetization process, collect residual magnetism states of the preset characteristic points on the magnetic shielding device 102 at the current time, demagnetization process electrical signals and excitation pulse signals output by the energy output recognition system 103, compare the residual magnetism states with preset residual magnetism expected values in a residual magnetism judgment basis library, and generate control instructions for adjusting demagnetization parameters at the next time.

[0023] In the embodiment, the preset characteristic points are key position points selected on the surface of the shielding layer of the magnetic shielding device 102 and used to represent the overall residual magnetism state; the residual magnetism states of the preset characteristic points can reflect the demagnetization effect of the entire magnetic shielding device 102, and thus serve as physical reference points for judging the demagnetization effect of the magnetic shielding device 102.

[0024] Further, the preset characteristic points in the demagnetization process can refer to detection time points bound to the preset characteristic points in the demagnetization process, that is, when the demagnetization process reaches a specific stage, residual magnetism detection needs to be performed on the preset characteristic points. At this time, the preset characteristic points are a combination of spatial positions and detection times.

[0025] Specifically, the control collection system 101 is configured to interrupt alternating current demagnetization at the preset characteristic points of the magnetic shielding device according to preset logic (such as demagnetization cycle nodes) in the demagnetization process, to create conditions free of external energy interference for residual magnetism detection.

[0026] The control collection system 101 is configured to collect residual magnetism states of the preset characteristic points in the magnetic shielding device 102, demagnetization process electrical signals output by the energy output recognition system 103, and excitation pulse signals output by the energy output recognition system 103.

[0027] Here, the residual magnetism state specifically refers to the residual magnetism size and distribution characteristics of the preset characteristic points of the magnetic shielding device 102 at a certain time. The residual magnetism state can directly reflect the demagnetization effect of the preset characteristic point position.

[0028] The demagnetization process electrical signal specifically refers to voltage parameters and current parameters of the alternating current demagnetization signal output by the energy output recognition system 103, and can be used to monitor the output state of the demagnetization energy in real time, to assist in judging whether the demagnetization process is normal.

[0029] The excitation pulse signal is specifically a short-time pulse signal output by the energy output identification system 103 when the demagnetization is interrupted, which is used to actively stimulate the preset characteristic point of the magnetic shielding device 102 to generate a magnetic response, so that the control acquisition system 101 can obtain the real-time residual magnetism state of the preset characteristic point by detecting the response.

[0030] Further, the characteristic point residual magnetism judgment basis library can be a database pre-established by the control acquisition system 101 in the calibration stage, which stores the residual magnetism expected value of each preset characteristic point at different stages of the demagnetization process, and can be used as a comparison reference for the real-time residual magnetism state.

[0031] The residual magnetism expected value is specifically a target residual magnetism value that the preset characteristic point should reach at a specific stage of the demagnetization process, which is determined by the measured data or theoretical calculation in the calibration stage, and is used for comparison with the real-time residual magnetism state to judge whether the demagnetization effect meets the standard.

[0032] Here, in the embodiment, the demagnetization process is divided into a calibration stage and a running stage. The calibration stage is a preprocessing stage before the demagnetization circuit is formally put into use, which is used to establish the reference data for the demagnetization judgment of the magnetic shielding device 102; the running stage is the core stage of the formal demagnetization operation of the demagnetization circuit, which realizes the dynamic self-adaptive adjustment of the demagnetization process based on the characteristic point residual magnetism judgment basis library established in the calibration stage.

[0033] The control acquisition system 101 is used to compare the real-time residual magnetism state with the preset residual magnetism expected value in the characteristic point residual magnetism judgment basis library, calculate the deviation, and generate a control instruction for adjusting the demagnetization parameters at the next moment, and send the control instruction to the energy output identification system 103 to drive the energy output identification system 103 to adjust the parameters of the alternating demagnetization signal, so as to realize the dynamic optimization of the demagnetization process.

[0034] The energy output identification system 103 is used to output the alternating demagnetization signal to perform demagnetization, output the excitation pulse signal to perform residual magnetism detection, identify the voltage zero-crossing point and the current zero-crossing point of the alternating demagnetization signal, and realize the mode switching of demagnetization and residual magnetism detection based on the zero-crossing points.

[0035] In the embodiment, the alternating demagnetization signal can be an alternating current / voltage signal output by the energy output identification system 103 to eliminate the residual magnetism of the magnetic shielding device 102, and the parameters of the alternating demagnetization signal can be dynamically adjusted according to the control instruction, so as to gradually weaken the residual magnetism of the magnetic shielding device 102 by generating an alternating magnetic field.

[0036] The voltage zero-crossing point can be the moment when the voltage value of the alternating demagnetization signal is zero.

[0037] At this time, the energy output recognition system 103 is used to control the stop of the output of the AC demagnetization signal, so as to avoid the interference of the voltage mutation on the magnetic shielding device 102 and create stable conditions for subsequent residual magnetism detection.

[0038] The current zero point can refer to the moment when the current value of the AC demagnetization signal is zero.

[0039] At this time, the connection between the magnetic shielding device 102 and the AC demagnetization signal is disconnected, and the connection between the magnetic shielding device 102 and the excitation pulse signal is connected, so as to formally switch the circuit to the residual magnetism detection mode. At this time, the excitation pulse signal is applied to obtain the residual magnetism state of the preset feature point.

[0040] Further, when the demagnetization detection is completed, the control collection system 101 sends the adjusted demagnetization parameter instruction to the energy output recognition system 103. The energy output recognition system 103 disconnects the connection between the magnetic shielding device 102 and the excitation pulse signal circuit and reconnects the connection with the AC demagnetization signal circuit. The energy output recognition system 103 outputs the AC demagnetization signal with adjusted parameters according to the new control instruction, restores the demagnetization mode, and continues to perform the demagnetization process.

[0041] Here, every time the demagnetization proceeds to the next preset feature point, the zero point recognition and circuit switching are triggered again, and the residual magnetism detection and parameter adjustment are repeated; until the control collection system 101 detects that the residual magnetism state of the preset feature point reaches the target value in the feature point residual magnetism judgment basis library, the demagnetization process is terminated.

[0042] The magnetic shielding device 102 is used to demagnetize under the action of the AC demagnetization signal and feedback the residual magnetism state of the preset feature point under the action of the excitation pulse signal.

[0043] In the embodiment, the magnetic shielding device 102 is connected with the energy output recognition system 103 through a circuit, receives the AC demagnetization signal and the excitation pulse signal output by the energy output recognition system 103, and at the same time, the residual magnetism state signal fed back by the magnetic shielding device 102 is transmitted to the control collection system 101 through the energy output recognition system 103, forming a closed loop and ensuring the adaptive optimization of the demagnetization process.

[0044] The adaptive active adjustment type magnetic shielding device 102 demagnetization circuit and device of the above-mentioned embodiments of the present disclosure interrupts demagnetization at preset characteristic points in the demagnetization process and collects real-time residual magnetic states, adjusts demagnetization parameters at the next time after comparison with preset residual magnetic expected values, solves the low efficiency problem that demagnetization parameters need to be reset after the process ends, and greatly improves the demagnetization efficiency and accuracy. With the help of the energy output identification system 103 to identify the zero-crossing points of the alternating demagnetization signal voltage and current, the accurate switching of the demagnetization and residual magnetic detection modes is realized, ensuring that the residual magnetic measurement is carried out under the condition of no external energy interference, and combining the feedback of the magnetic shielding device 102 to the characteristic point residual magnetic state, the accuracy of the residual magnetic detection is improved, providing a reliable basis for parameter adjustment. Through the closed-loop feedback mechanism and dynamic parameter adjustment, it can adapt to the characteristics of different magnetic shielding devices 102 and diversified demagnetization needs, especially for large or complex structure magnetic shielding devices 102, which can reduce manual intervention, ensure the stability and reliability of the demagnetization effect, and expand the application scenarios of magnetic shielding technology in the precision field.

[0045] In one possible implementation of the above-mentioned embodiments, please refer to Figure 2 , Figure 2 is an example schematic diagram of a specific architecture of an adaptive active adjustment type magnetic shielding device demagnetization circuit of an embodiment of the present disclosure. As Figure 2 shown, in the adaptive active adjustment type magnetic shielding device demagnetization circuit 200, the control collection system 101 includes a residual magnetic collection unit 101a, which is used to pre-collect initial residual magnetic data of each preset characteristic point on the surface of the shielding layer of the magnetic shielding device 102 in the calibration stage, establish preset residual magnetic expected values of each characteristic point in the demagnetization process, and form a characteristic point residual magnetic judgment basis library; the residual magnetic collection unit 101a does not participate in the collection of residual magnetic states after the calibration stage is completed.

[0046] In this embodiment, a plurality of preset characteristic points are preset on the surface of the shielding layer of the magnetic shielding device 102 according to a preset rule in the calibration stage.

[0047] The residual magnetic collection unit 101a is only activated in the calibration stage. The residual magnetic collection unit 101a is provided with a spatial magnetic field measuring device (not specifically shown in the figure), such as a weak magnetic detection device. Figure 2

[0048] Specifically, the residual magnetic collection unit 101a pre-sets theoretical characteristic point positions and theoretical residual magnetic values corresponding to each demagnetization stage based on factors such as material properties, design parameters, etc. of the magnetic shielding device 102; the residual magnetic collection unit 101a actually measures the above-mentioned theoretical characteristic point positions point by point through the spatial magnetic field measuring device, and obtains actual initial residual magnetic values of each theoretical characteristic point position; compares the actual initial residual magnetic values with the theoretical residual magnetic values, and generates a theoretical-actual residual magnetic curve; ​The residual magnetism acquisition unit 101a screens out a position that can best represent the overall demagnetization effect of the actual residual magnetism state through curve fitting and deviation analysis, etc., as the real residual magnetism characteristic point of the magnetic shielding device 102; based on the actual initial residual magnetism value of the real residual magnetism characteristic point, in combination with the demagnetization target, the actual residual magnetism expected value that each real characteristic point should reach in different stages of the demagnetization process is determined, and is integrated into a characteristic point residual magnetism judgment basis library.

[0049] Further, after the construction of the characteristic point residual magnetism judgment basis library is completed, the residual magnetism acquisition unit 101a is logically no longer involved in the subsequent running stage.

[0050] At this time, the parameters of the characteristic point residual magnetism judgment basis library are synchronously transmitted to other modules of the control acquisition system 101 as the core reference of the running stage.

[0051] Through the adaptive active adjustment type magnetic shielding device demagnetization circuit and device of the above-mentioned embodiments of the present disclosure, a dedicated characteristic point residual magnetism judgment basis library is established for each magnetic shielding device in the calibration stage, so that the dynamic adjustment of the demagnetization process has a precise quantitative standard, and the accuracy of the demagnetization parameter optimization is improved. The residual magnetism acquisition unit 101a is only activated in the calibration stage, and is logically stripped after completing the task, so as to avoid long-term occupation of system resources and realize light and efficient operation of the system.

[0052] In one possible implementation manner of the above-mentioned embodiments, please refer to Figure 3 , Figure 3 is another example of the specific architecture of the adaptive active adjustment type magnetic shielding device demagnetization circuit of the embodiments of the present disclosure. As shown in Figure 3 , in the adaptive active adjustment type magnetic shielding device demagnetization circuit 300, the control acquisition system 101 further includes a demagnetization signal acquisition unit 101b, a pulse signal acquisition unit 101c, a signal processing unit 101d and a controller 101e; The demagnetization signal acquisition unit 101b is used to acquire the demagnetization process electric signal of the energy output identification system 103 at the preset characteristic point, so as to monitor the energy output state in the demagnetization process in real time; wherein the demagnetization process electric signal is the voltage parameter and the current parameter of the alternating demagnetization signal; The pulse signal acquisition unit 101c is used to acquire the excitation pulse signal output by the energy output identification system 103 and the residual magnetism state fed back by the preset characteristic point under the excitation pulse signal; The signal processing unit 101d is used to receive the demagnetization process electric signal, the excitation pulse signal and the residual magnetism state, call the characteristic point residual magnetism judgment basis library, compare the residual magnetism state with the residual magnetism expected value in the characteristic point residual magnetism judgment basis library, generate a control instruction for adjusting the demagnetization parameter at the next moment according to the comparison result, and send the control instruction to the energy output identification system 103 through the controller 101e.

[0053] In the embodiment, the running stage includes a demagnetization mode and a residual magnetism detection mode.

[0054] The demagnetization signal acquisition unit 101b is configured to acquire, in a detection timing bound with the preset feature point during the demagnetization process, a demagnetization process electrical signal containing voltage and current data at the preset feature point, and transmit the demagnetization process electrical signal to the signal processing unit 101d for judging whether the demagnetization energy is stable.

[0055] The pulse signal acquisition unit 101c is configured to acquire a bidirectional signal, which includes an excitation pulse signal output by the energy output identification system 103 and an electrical signal feedback generated by the preset feature point of the magnetic shielding device 102 due to residual magnetism under the action of the excitation pulse signal.

[0056] The pulse signal acquisition unit 101c transmits the bidirectional signal containing the excitation pulse signal and the residual magnetism state to the signal processing unit 101d.

[0057] Further, the signal processing unit 101d is configured to determine the residual magnetism state based on the electrical signal feedback, call a feature point residual magnetism judgment basis library, compare the residual magnetism state with a residual magnetism expected value in the feature point residual magnetism judgment basis library, and generate a control instruction for adjusting a demagnetization parameter at the next moment according to a comparison result.

[0058] For example, the signal processing unit 101d determines that the residual magnetism state of the preset feature point is 10% higher than the residual magnetism expected value in the feature point residual magnetism judgment basis library, and generates a control instruction for increasing the demagnetization energy.

[0059] Further, the controller 101e receives the control instruction generated by the signal processing unit 101d, sends the control instruction to the energy output identification system 103, and controls the switching of the demagnetization mode or the residual magnetism detection mode.

[0060] Through the adaptive active adjustment type magnetic shielding device demagnetization circuit and device of the above-mentioned embodiments of the present disclosure, the demagnetization signal acquisition unit 101b can capture the voltage and current parameters of the alternating current demagnetization signal in real time, dynamically monitor the energy output stability, and avoid incomplete demagnetization caused by abnormal energy; the pulse signal acquisition unit 101c synchronously acquires the bidirectional signal of the excitation pulse and the residual magnetism feedback, and the combination of the two can realize full-chain monitoring of the demagnetization process and improve the accuracy of detection and control. The controller receives the control instruction and sends it to the energy output identification system, thereby realizing effective control of the switching of the demagnetization mode and the residual magnetism detection mode, and ensuring the timeliness and stability of the switching of the two modes.

[0061] In one possible implementation of the above-mentioned embodiments, refer to Figure 4 , Figure 4is another example of a specific architecture of a demagnetization circuit of an adaptive active adjustment type magnetic shielding device according to an embodiment of the present disclosure. As shown in Figure 4 In the adaptive active adjustment type magnetic shielding device demagnetization circuit 400, the energy output identification system 103 includes a zero-crossing analysis identification unit 103a, which is configured to identify the voltage zero-crossing and the current zero-crossing of the AC demagnetization signal, stop the output of the AC demagnetization signal by the energy output identification system 103 at the voltage zero-crossing, and disconnect the magnetic shielding device 102 from the AC demagnetization signal and connect the magnetic shielding device 102 to the excitation pulse signal at the current zero-crossing, so as to switch from the demagnetization mode to the residual magnetism detection mode.

[0062] In this embodiment, the zero-crossing analysis identification unit 103a is configured to monitor the voltage and current changes of the AC demagnetization signal in real time in the demagnetization mode, and capture the voltage zero-crossing and the current zero-crossing.

[0063] Specifically, the zero-crossing analysis identification unit 103a is configured to trigger a control instruction at the voltage zero-crossing, so as to stop the output of the AC demagnetization signal by the energy output identification system, cut off the demagnetization energy, and avoid the interference of voltage mutation on subsequent detection; and trigger a switching instruction at the current zero-crossing (the current needs to naturally decay to zero because the magnetic shielding device 102 is an inductive load), disconnect the magnetic shielding device 102 from the AC demagnetization signal loop, and connect the magnetic shielding device 102 to the excitation pulse signal loop, so as to complete the switching from the demagnetization mode to the residual magnetism detection mode.

[0064] Here, the output is cut off at the voltage zero-crossing, which can ensure that there is no voltage impact when the demagnetization energy stops; and the loop is switched at the current zero-crossing, which can avoid the generation of electric arc or energy interference due to current mutation, and ensure that the residual magnetism detection is performed in a pure environment without external energy excitation, so as to improve the detection accuracy.

[0065] As an example, please refer to Figure 5 , Figure 5 is an example of the action process of an adaptive active modulation magnetic shielding device 102 in an adaptive active adjustment type magnetic shielding device demagnetization circuit according to an embodiment of the present disclosure. As shown in Figure 5 , the horizontal axis is the time axis, and the vertical axis is the amplitude of the AC demagnetization signal.

[0066] In this embodiment, the energy output identification system 103 outputs the AC demagnetization signal to the magnetic shielding device 102, so that the residual magnetism on the shielding layer of the magnetic shielding device 102 gradually decays with the signal period Figure 5 , the waveform amplitude gradually decreases, which reflects the demagnetization effect).

[0067] The zero-crossing analysis and identification unit 103a identifies the voltage zero-crossing of the AC demagnetization signal, controls the stop of the output of the AC demagnetization signal; the zero-crossing analysis and identification unit 103a synchronously identifies the current zero-crossing, switches the loop at the current zero-crossing, outputs the excitation pulse signal, and detects the residual magnetism state of the preset feature point. Wherein, Figure 5 The middle rectangular area is a switching window between the demagnetization mode and the residual magnetism detection mode.

[0068] The control acquisition system 101 compares the residual magnetism detection result with the feature point residual magnetism determination basis library, calculates the demagnetization parameter deviation, generates a control instruction, adjusts the AC demagnetization signal parameters of the next stage, makes the subsequent demagnetization signal adapt to the new parameters, and repeats the above operation at the next preset feature point, so as to complete the demagnetization.

[0069] Through the adaptive active adjustment type magnetic shielding device 102 demagnetization circuit and device of the above-mentioned embodiments of the present disclosure, the zero-crossing analysis and identification unit 103a provides a key guarantee for the accuracy of residual magnetism detection and the stability of the demagnetization process through accurate zero-crossing identification and step-by-step control.

[0070] In one possible implementation manner of the above-mentioned embodiments, please refer to Figure 6 , Figure 6 is another example of the specific architecture of the adaptive active adjustment type magnetic shielding device demagnetization circuit of the embodiments of the present disclosure. As Figure 6 shown, in the adaptive active adjustment type magnetic shielding device demagnetization circuit 600, the energy output identification system 103 further includes a power switching unit 103b, which is used to disconnect the connection between the AC demagnetization signal and the magnetic shielding device 102 at the current zero-crossing under the triggering of the zero-crossing analysis and identification unit 103a, and connect the magnetic shielding device 102 and the excitation pulse signal.

[0071] In the present embodiment, the power switching unit 103b is the core execution component responsible for the physical loop switching in the energy output identification system 103, and the function can be to realize the switching of the path between the magnetic shielding device 102 and the AC demagnetization signal loop and the excitation pulse signal loop under the control of the zero-crossing analysis and identification unit 103a.

[0072] Here, the power switching unit 103b can essentially be a group of controlled switching devices (such as relays, semiconductor switches, etc.), which are respectively connected to the AC demagnetization signal loop and the excitation pulse signal loop.

[0073] When the power switching unit 103b detects the current zero-crossing of the AC demagnetization signal, it immediately performs: disconnecting the connection between the AC demagnetization signal and the magnetic shielding device 102, cutting off the demagnetization energy input; and synchronously connecting the excitation pulse signal and the magnetic shielding device 102, providing a signal path for residual magnetism detection.

[0074] Wherein, since the shielding layer of the magnetic shielding device 102 has inductance, the current of the magnetic shielding device 102 cannot be instantaneously changed, and if forced to be cut off, high-voltage arc can be generated, thereby interfering with detection or damaging the equipment. Therefore, the switching timing of the power switching unit 103b is strictly bound to the current zero-crossing point, so as to ensure that there is no current impact when the demagnetization signal loop is disconnected, and to avoid arc or electromagnetic interference; and when the excitation pulse signal loop is connected, the magnetic shielding device is in a state of no residual current, at this time, the excitation pulse signal is injected, the residual magnetism response can be accurately excited and collected, and the detection accuracy is ensured.

[0075] Through the adaptive active adjustment type magnetic shielding device demagnetization circuit and device of the above-mentioned embodiments of the present disclosure, the power switching unit 103b strictly performs path switching at the current zero-crossing point, realizes the orderly conversion of the demagnetization loop and the detection loop, and thereby ensures the accuracy of the loop switching. From the hardware level, the problem of equipment damage and signal interference caused by improper switching is solved, and the stability of the demagnetization circuit under complex working conditions is enhanced.

[0076] In one possible implementation of the above-mentioned embodiments, please refer to Figure 7 , Figure 7 is another example of a specific architecture of an adaptive active adjustment type magnetic shielding device demagnetization circuit according to an embodiment of the present disclosure. As shown in Figure 7 , in the adaptive active adjustment type magnetic shielding device demagnetization circuit 700, the energy output identification system 103 further includes a demagnetization power generator 103c and a pulse signal generator 103d, the demagnetization power generator 103c is used to output an alternating demagnetization signal, and the pulse signal generator 103d is used to output an excitation pulse signal. The zero-crossing point analysis and identification unit 103a controls the demagnetization power generator 103c to stop outputting the alternating demagnetization signal, and synchronously triggers the pulse signal generator 103d to output the excitation pulse signal.

[0077] In this embodiment, the zero-crossing point analysis and identification unit 103a synchronously controls the actions of the demagnetization power generator 103c and the pulse signal generator 103d, wherein: at the voltage zero-crossing point, the alternating demagnetization signal output of the demagnetization power generator 103c is cut off, and the pulse signal generator 103d is triggered to output the excitation pulse signal, so as to ensure that the timing of the stop of the demagnetization signal and the start of the detection signal is accurately connected, avoid the superposition interference of the two signals, ensure that the residual magnetism detection is performed in an environment without demagnetization energy interference, and improve the detection accuracy.

[0078] The demagnetization circuit and the device of the adaptive active adjustment type magnetic shielding device according to the above-mentioned embodiments of the present disclosure, the alternating demagnetization signal output by the demagnetization power generator 103c provides the core energy for the demagnetization of the magnetic shielding device 102, and the parameters thereof can be adjusted according to the control instruction to adapt to the requirements of different demagnetization stages; the excitation pulse signal output by the pulse signal generator 103d provides an active injection signal for the residual magnetism detection, and ensures that the residual magnetism response of the preset feature point of the magnetic shielding device 102 can be effectively excited to provide a reliable input for the residual magnetism state judgment.

[0079] The embodiments of the present disclosure further provide an adaptive active adjustment type magnetic shielding device demagnetization device, and the adaptive active adjustment type magnetic shielding device demagnetization circuit according to the above-mentioned embodiments of the present disclosure can be applied to the adaptive active adjustment type magnetic shielding device demagnetization device as a hardware unit in the adaptive active adjustment type magnetic shielding device demagnetization device.

[0080] Although the embodiments of the present disclosure are described in combination with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A demagnetization circuit for an adaptive active magnetic shielding device, characterized in that The circuit comprises a control acquisition system, a magnetic shielding device and an energy output identification system; the control acquisition system is connected with the energy output identification system, and the energy output identification system is connected with the magnetic shielding device; The control acquisition system is used for interrupting demagnetization at preset characteristic points in the demagnetization process, acquiring the residual magnetic state of the preset characteristic points on the magnetic shielding device, the demagnetization process electric signal and the excitation pulse signal of the energy output identification system at the current time, comparing the residual magnetic state with the preset residual magnetic expected value in the characteristic point residual magnetic judgment basis library, and generating a control instruction for adjusting the demagnetization parameters at the next time; The energy output identification system is used for outputting an alternating current demagnetization signal to perform demagnetization and outputting an excitation pulse signal to perform residual magnetic detection, identifying the voltage zero-crossing point and the current zero-crossing point of the alternating current demagnetization signal, and switching the modes of demagnetization and residual magnetic detection based on the zero-crossing points. The magnetic shielding device is used for performing demagnetization under the action of the alternating current demagnetization signal and feeding back the residual magnetic state of the preset characteristic points under the action of the excitation pulse signal.

2. The circuit of claim 1, wherein, The control acquisition system comprises a residual magnetic acquisition unit, which is used for pre-acquiring initial residual magnetic data of each preset characteristic point on the surface of the shielding layer of the magnetic shielding device in a calibration stage, establishing preset residual magnetic expected values of each characteristic point in the demagnetization process, and forming a characteristic point residual magnetic judgment basis library; the residual magnetic acquisition unit does not participate in the acquisition of the residual magnetic state after the calibration stage is completed.

3. The circuit of claim 2, wherein, The control acquisition system further comprises a demagnetization signal acquisition unit, a pulse signal acquisition unit, a signal processing unit and a controller; The demagnetization signal acquisition unit is used for acquiring the demagnetization process electric signal of the energy output identification system at the preset characteristic points, so as to monitor the energy output state in the demagnetization process in real time; wherein the demagnetization process electric signal is the voltage parameter and the current parameter of the alternating current demagnetization signal; The pulse signal acquisition unit is used for acquiring the excitation pulse signal output by the energy output identification system and the residual magnetic state of the preset characteristic points fed back under the excitation pulse signal; The signal processing unit is used for receiving the demagnetization process electric signal, the excitation pulse signal and the residual magnetic state, calling the characteristic point residual magnetic judgment basis library, comparing the residual magnetic state with the residual magnetic expected value in the characteristic point residual magnetic judgment basis library, generating a control instruction for adjusting the demagnetization parameters at the next time according to the comparison result, and sending the control instruction to the energy output identification system through the controller.

4. The circuit of claim 3, wherein, The energy output identification system comprises a zero-crossing point analysis and identification unit, which is used for identifying the voltage zero-crossing point and the current zero-crossing point of the alternating current demagnetization signal, controlling the energy output identification system to stop outputting the alternating current demagnetization signal at the voltage zero-crossing point, disconnecting the magnetic shielding device and the alternating current demagnetization signal at the current zero-crossing point, and connecting the magnetic shielding device and the excitation pulse signal, so as to switch from the demagnetization mode to the residual magnetic detection mode.

5. The circuit of claim 4, wherein, The energy output recognition system further comprises a power switching unit, which is used to disconnect the connection between the alternating current degaussing signal and the magnetic shielding device at the current zero point and connect the connection between the magnetic shielding device and the excitation pulse signal under the triggering of the zero-crossing analysis recognition unit.

6. The circuit of claim 5, wherein, The energy output recognition system further comprises a degaussing power generator and a pulse signal generator, the degaussing power generator is used to output the alternating current degaussing signal, and the pulse signal generator is used to output the excitation pulse signal. The zero-crossing analysis recognition unit controls the degaussing power generator to stop outputting the alternating current degaussing signal and synchronously triggers the pulse signal generator to output the excitation pulse signal.

7. A demagnetization device for an adaptive active magnetic shielding device, characterized by The self-adaptive active adjustment type magnetic shielding device degaussing device comprises the self-adaptive active adjustment type magnetic shielding device degaussing circuit according to any one of claims 1-6.

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