An adaptive active adjustment magnetic shielding device demagnetization circuit and apparatus

Abstract

This disclosure relates to the field of magnetic shielding technology, and discloses an adaptive active adjustment magnetic shielding device demagnetization circuit and apparatus, a control acquisition system for comparing the residual magnetism state with a preset expected value and generating control commands; an energy output identification system for outputting an AC demagnetization signal for demagnetization according to the control commands, outputting an excitation pulse signal for residual magnetism detection, identifying the zero-crossing point of the AC demagnetization signal, and realizing the switching between demagnetization and residual magnetism detection modes; and a magnetic shielding device for demagnetizing under the action of the AC demagnetization signal and feeding back the residual magnetism state at a preset feature point under the action of the excitation pulse signal. By interrupting demagnetization at a preset feature point during the demagnetization process and acquiring the real-time residual magnetism state, comparing it with the preset expected residual magnetism value, and adjusting the demagnetization parameters for the next moment, the inefficiency problem of needing to reset the demagnetization parameters after the process is completed is solved, significantly improving the demagnetization efficiency and accuracy.

Description

Technical Field

[0001] This invention relates to the field of magnetic shielding space technology, specifically to an adaptive active adjustment magnetic shielding device demagnetization circuit and apparatus. Background Technology

[0002] With the deepening application of magnetic shielding technology in high-end scientific research, precision manufacturing and other fields, the impact of demagnetizing circuits on the performance of magnetic shielding devices is becoming increasingly critical. Its demagnetizing efficiency and accuracy directly determine the stability of the shielding effect. The application scenarios are expanding towards larger and more complex directions, which puts forward higher requirements for dynamic adjustment capabilities.

[0003] In related technologies, demagnetizing circuits mostly adopt an open-loop control mode, which means that parameters cannot be adjusted in real time during the demagnetizing process and can only be reset based on measurement results after demagnetizing, resulting in low efficiency. Therefore, how to achieve dynamic adjustment of the demagnetizing process through real-time feedback and improve the performance of the demagnetizing circuit has become an urgent technical problem to be solved. Summary of the Invention

[0004] In view of this, the present invention provides an adaptive active adjustment magnetic shielding device demagnetization circuit and apparatus to solve the problem of how to achieve dynamic adjustment of the demagnetization process through real-time feedback and improve the performance of the demagnetization circuit.

[0005] This disclosure provides an adaptive active adjustment magnetic shielding device demagnetization circuit, comprising: a control acquisition system, a magnetic shielding device, and an energy output identification system; the control acquisition system is connected to the energy output identification system, and the energy output identification system is connected to the magnetic shielding device; the control acquisition system is used to interrupt demagnetization at a preset feature point during the demagnetization process, acquire the residual magnetism state of the preset feature point on the magnetic shielding device at the current moment, the demagnetization process electrical signal and excitation pulse signal of the energy output identification system, compare the residual magnetism state with the preset residual magnetism expectation value in the feature point residual magnetism judgment base library, and generate a control command for adjusting the demagnetization parameters at the next moment; the energy output identification system is used to output an AC demagnetization signal for demagnetization according to the control command, output an excitation pulse signal for residual magnetism detection, identify the voltage zero-crossing point and current zero-crossing point of the AC demagnetization signal, and realize the mode switching of demagnetization and residual magnetism detection based on the zero-crossing point; the magnetic shielding device is used to demagnetize under the action of the AC demagnetization signal and to feedback the residual magnetism state of the preset feature point under the action of the excitation pulse signal.

[0006] In another aspect, this disclosure provides an adaptive active adjustment magnetic shielding device demagnetizing device, which includes the aforementioned adaptive active adjustment magnetic shielding device demagnetizing circuit.

[0007] The adaptive active adjustment magnetic shielding device demagnetization circuit and apparatus of the above embodiments of this disclosure solves the inefficiency problem of demagnetization parameters needing to be reset after the process ends by interrupting demagnetization at a preset feature point and collecting the real-time residual magnetism state. The demagnetization parameters are then adjusted by comparing this data with the preset expected residual magnetism value. This significantly improves demagnetization efficiency and accuracy. By using an energy output identification system to identify the voltage and current zero-crossing points of the AC demagnetization signal, precise switching between demagnetization and residual magnetism detection modes is achieved, ensuring that residual magnetism measurement is performed without external energy interference. Combined with the feedback from the magnetic shielding device on the residual magnetism state at the feature point, the accuracy of residual magnetism detection is improved, providing a reliable basis for parameter adjustment.

[0008] Furthermore, through closed-loop feedback mechanisms and dynamic parameter adjustments, it can adapt to the characteristics of different magnetic shielding devices and diverse demagnetization needs. Especially for large or complex magnetic shielding devices, it can reduce manual intervention, ensure the stability and reliability of the demagnetization effect, and expand the application scenarios of magnetic shielding technology in precision fields. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this disclosure, the accompanying drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is an exemplary schematic diagram of the architecture of a demagnetizing circuit for an adaptive active adjustment magnetic shielding device according to an embodiment of this disclosure.

[0011] Figure 2 This is an exemplary schematic diagram of the specific architecture of a demagnetizing circuit for an adaptive active adjustment magnetic shielding device according to an embodiment of this disclosure;

[0012] Figure 3 This is an exemplary schematic diagram of the specific architecture of a demagnetizing circuit for another adaptive active adjustment magnetic shielding device according to an embodiment of this disclosure;

[0013] Figure 4 This is an exemplary schematic diagram of the specific architecture of another adaptive active adjustment magnetic shielding device demagnetization circuit according to an embodiment of this disclosure;

[0014] Figure 5 This is an exemplary schematic diagram of the operation process of the adaptive active modulation magnetic shielding device 102 in the demagnetization circuit of an adaptive active adjustment magnetic shielding device according to an embodiment of this disclosure.

[0015] Figure 6This is an exemplary schematic diagram of the specific architecture of another adaptive active adjustment magnetic shielding device demagnetization circuit according to an embodiment of the present disclosure;

[0016] Figure 7 This is an exemplary schematic diagram of the specific architecture of another adaptive active adjustment magnetic shielding device demagnetization circuit according to an embodiment of the present disclosure. Detailed Implementation

[0017] With the deepening application of magnetic shielding technology in high-end scientific research, precision manufacturing and other fields, the impact of demagnetizing circuits on the performance of magnetic shielding devices is becoming increasingly critical. Its demagnetizing efficiency and accuracy directly determine the stability of the shielding effect. The application scenarios are expanding towards larger and more complex directions, which puts forward higher requirements for dynamic adjustment capabilities.

[0018] In the first related technology, an active demagnetization method for a magnetic shielding device is disclosed. A closed magnetic field is generated by winding a demagnetizing coil, and an alternating oscillating current with gradually decreasing amplitude is generated by using a demagnetizing power supply. This causes the demagnetizing coil to generate an alternating oscillating magnetic field and flow along a cyclic orientation to achieve demagnetization.

[0019] However, the first related technology has the following problems:

[0020] 1. The method of using cyclic bidirectional current demagnetization does not involve an adaptive adjustment mechanism based on closed-loop feedback. The demagnetization parameters cannot be dynamically adjusted according to the real-time status, resulting in low efficiency.

[0021] Furthermore, the demagnetization schemes involving magnetic shielding devices in the second related technology supply power to the demagnetizing coil through a drive circuit. Some schemes employ a closed-loop feedback mechanism or achieve demagnetization by gradually attenuating the oscillating current. The second related technology has the following problems:

[0022] Relying on space magnetic field measuring devices (such as magnetic sensors) to monitor the internal space magnetic field in real time requires the deployment of a large number of sensors, which is costly and not suitable for large-scale devices; it does not distinguish between the calibration stage and the operation stage, and relies on space magnetic field detection throughout the process, resulting in insufficient targeting and efficiency of parameter adjustment during demagnetization.

[0023] Furthermore, the third related technology discloses achieving high-precision demagnetizing current output by establishing a mathematical model and designing a composite controller, and the fourth related technology discloses adjusting demagnetizing parameters by collecting feedback from the residual magnetism on the surface of the magnetic shielding layer and the internal magnetic field. The third and fourth related technologies have the following problems:

[0024] No interruption detection mechanism was set up during the demagnetization process, making it impossible to measure the residual magnetism of characteristic points in real time through active injection during the demagnetization process;

[0025] The closed-loop control logic is not designed for the dynamic process of demagnetization interruption + feature point detection + parameter adaptive adjustment, resulting in limited real-time performance and accuracy of demagnetization parameter adjustment.

[0026] To address the aforementioned problems, various embodiments of this disclosure provide an adaptive active adjustment magnetic shielding device demagnetization circuit. The circuit includes: a control acquisition system, a magnetic shielding device, and an energy output identification system. The control acquisition system is connected to the energy output identification system, and the energy output identification system is connected to the magnetic shielding device. The control acquisition system is used to interrupt demagnetization at a preset feature point during the demagnetization process, acquire the residual magnetism state of the preset feature point on the magnetic shielding device at the current moment, the demagnetization process electrical signal and excitation pulse signal from the energy output identification system, compare the residual magnetism state with the preset expected residual magnetism value in the feature point residual magnetism judgment database, and generate a control command for adjusting the demagnetization parameters at the next moment. The energy output identification system is used to output an AC demagnetization signal for demagnetization according to the control command, output an excitation pulse signal for residual magnetism detection, identify the voltage zero-crossing point and current zero-crossing point of the AC demagnetization signal, and switch between demagnetization and residual magnetism detection modes based on the zero-crossing point. The magnetic shielding device is used to demagnetize under the action of the AC demagnetization signal and to feedback the residual magnetism state of the preset feature point under the action of the excitation pulse signal.

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0028] Please refer to Figure 1 , Figure 1 This is an exemplary schematic diagram of the architecture of a demagnetizing circuit for an adaptive active adjustment magnetic shielding device according to an embodiment of this disclosure. Figure 1 As shown, the demagnetization circuit 100 of the adaptive active adjustment magnetic shielding device includes: a control acquisition system 101, a magnetic shielding device 102, and an energy output identification system 103. The control acquisition system 101 is connected to the energy output identification system 103, and the energy output identification system 103 is connected to the magnetic shielding device 102.

[0029] Among them, the control and acquisition system 101 is the decision-making and sensing center of the demagnetization circuit 100 of the adaptive active adjustment magnetic shielding device, and is used for interruption control, signal acquisition, data analysis and parameter adjustment instruction generation in the demagnetization process.

[0030] The magnetic shielding device 102 is the target of the demagnetization operation of the adaptive active adjustment magnetic shielding device demagnetization circuit 100. Specifically, it refers to the magnetic shielding structure (such as a magnetic shielding cabin, magnetic shielding room, etc.) that needs to have its residual magnetism eliminated, and may contain multiple shielding layers.

[0031] The energy output identification system 103 is the execution and signal generation center of the demagnetization circuit 100 of the adaptive active adjustment magnetic shielding device. Specifically, it is used to output demagnetization and detection signals according to control commands and realize the switching between demagnetization and residual magnetism detection modes.

[0032] The control acquisition system 101 is used to interrupt demagnetization at a preset feature point during the demagnetization process, acquire the residual magnetism state of the preset feature point on the magnetic shielding device 102 at the current moment, the demagnetization process electrical signal and excitation pulse signal of the energy output identification system 103, compare the residual magnetism state with the preset residual magnetism expected value in the feature point residual magnetism judgment base library, and generate a control command for adjusting the demagnetization parameters at the next moment.

[0033] In this embodiment, the preset feature point is a key location point selected on the shielding layer surface of the magnetic shielding device 102 to characterize the overall residual magnetism state; the residual magnetism state of the preset feature point can reflect the demagnetization effect of the entire magnetic shielding device 102, and therefore serves as a physical reference point for judging the demagnetization effect of the magnetic shielding device 102.

[0034] Furthermore, the preset feature point in the demagnetization process can refer to the detection timing bound to the preset feature point during the demagnetization process, that is, when the demagnetization reaches a certain stage, the preset feature point needs to be detected for residual magnetism. In this case, the preset feature point is a combination of spatial location and detection time.

[0035] Specifically, the control acquisition system 101 is used to interrupt AC demagnetization at a preset characteristic point of the magnetic shielding device during the demagnetization process according to preset logic (such as demagnetization cycle nodes), so as to create conditions without external energy interference for residual magnetism detection.

[0036] The control acquisition system 101 is used to acquire the residual magnetism of preset feature points in the magnetic shielding device 102, the demagnetization process electrical signal output by the energy output identification system 103, and the excitation pulse signal output by the energy output identification system 103.

[0037] Here, the residual magnetism specifically refers to the magnitude and distribution characteristics of the residual magnetism at a preset feature point of the magnetic shielding device 102 at a certain moment. The residual magnetism directly reflects the demagnetization effect at the preset feature point location.

[0038] The electrical signal during the demagnetization process specifically refers to the voltage and current parameters of the AC demagnetization signal output by the energy output identification system 103. It can be used to monitor the output status of the demagnetization energy in real time and help determine whether the demagnetization process is normal.

[0039] The excitation pulse signal specifically refers to the short-time pulse signal output by the energy output identification system 103 when demagnetization is interrupted. It is used to actively excite the preset feature 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 feature point by detecting the response.

[0040] Furthermore, the feature point residual magnetism determination base can be a database pre-established by the control acquisition system 101 during the calibration stage, which stores the expected residual magnetism values ​​of each preset feature point at different stages of the demagnetization process, and can be used as a comparison benchmark for real-time residual magnetism status.

[0041] Specifically, the residual magnetism expected value refers to the target residual magnetism value that a preset feature point should reach at a specific stage of the demagnetization process, which is stored in the feature point residual magnetism judgment basis library. It is determined by the measured data or theoretical calculations during the calibration stage and is used to compare with the real-time residual magnetism state to determine whether the demagnetization effect meets the standard.

[0042] In this embodiment, the demagnetization process is divided into a calibration stage and an operation stage. The calibration stage is a preprocessing stage before the demagnetization circuit is officially put into use, which is used to establish benchmark data for demagnetization determination for the magnetic shielding device 102. The operation stage is the core stage in which the demagnetization circuit officially performs the demagnetization operation, and realizes dynamic adaptive adjustment of the demagnetization process based on the feature point residual magnetism determination base established in the calibration stage.

[0043] The control acquisition system 101 is used to compare the real-time acquired residual magnetism state with the preset residual magnetism expected value in the feature point residual magnetism judgment base library, calculate the deviation and generate a control command to adjust the demagnetization parameters at the next moment, and send the control command to the energy output identification system 103 to drive the energy output identification system 103 to adjust the parameters of the AC demagnetization signal, thereby realizing the dynamic optimization of the demagnetization process.

[0044] The energy output identification system 103 is used to output an AC demagnetization signal for demagnetization according to control commands, output an excitation pulse signal for residual magnetism detection, identify the voltage zero-crossing point and current zero-crossing point of the AC demagnetization signal, and realize the mode switching between demagnetization and residual magnetism detection based on the zero-crossing point.

[0045] In this embodiment, the AC demagnetizing signal can refer to the alternating current / voltage signal output by the energy output identification system 103, which is used to eliminate the residual magnetism of the magnetic shielding device 102. The parameters of the AC demagnetizing signal can be dynamically adjusted according to the control command, and the residual magnetism of the magnetic shielding device 102 is gradually weakened by generating an alternating magnetic field.

[0046] The voltage zero-crossing point can refer to the moment when the voltage value of the AC demagnetizing signal is zero.

[0047] At this time, the energy output identification system 103 is used to control the stop output of AC demagnetization signal, which can avoid voltage sudden change from interfering with the magnetic shielding device 102 and create stable conditions for subsequent residual magnetism detection.

[0048] The current zero-crossing point can refer to the moment when the current value of the AC demagnetizing signal is zero.

[0049] At this time, disconnect the magnetic shielding device 102 from the AC demagnetization signal, and simultaneously connect the magnetic shielding device 102 to the excitation pulse signal to officially 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.

[0050] Furthermore, when the demagnetization detection is completed, the control acquisition system 101 sends the adjusted demagnetization parameter command to the energy output identification system 103. The energy output identification system 103 disconnects the magnetic shielding device 102 from the excitation pulse signal circuit and reconnects the connection with the AC demagnetization signal circuit. According to the new control command, the energy output identification system 103 outputs the AC demagnetization signal after the parameter adjustment, the demagnetization mode is restored, and the demagnetization process continues.

[0051] Here, each time the demagnetization process reaches the next preset feature point, the zero-crossing identification and loop switching are triggered again, and the residual magnetism detection and parameter adjustment are repeated; until the control acquisition 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 terminates.

[0052] The magnetic shielding device 102 is used to demagnetize under the action of an AC demagnetizing signal and to provide feedback on the residual magnetism of a preset characteristic point under the action of an excitation pulse signal.

[0053] In this embodiment, the magnetic shielding device 102 is connected to the energy output identification system 103 via a line, and receives the AC demagnetization signal and excitation pulse signal output by the energy output identification system 103; at the same time, the residual magnetism state signal fed back by the magnetic shielding device 102 is transmitted to the control acquisition system 101 through the energy output identification system 103 to form a closed loop and ensure the adaptive optimization of the demagnetization process.

[0054] The adaptive active adjustment magnetic shielding device 102 demagnetization circuit and apparatus of the above embodiments of this disclosure solves the inefficiency problem of demagnetization parameters needing to be reset after the process ends by interrupting demagnetization at a preset characteristic point and collecting the real-time residual magnetism state. After comparing it with the preset expected residual magnetism value, the demagnetization parameters are adjusted for the next moment, greatly improving the demagnetization efficiency and accuracy. The energy output identification system 103 identifies the voltage and current zero-crossing points of the AC demagnetization signal, enabling precise switching between demagnetization and residual magnetism detection modes. This ensures that residual magnetism measurement is performed without external energy interference. Combined with the feedback of the residual magnetism state at the characteristic point by the magnetic shielding device 102, the accuracy of residual magnetism 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 diverse demagnetization needs. Especially for large or complex magnetic shielding devices 102, it can reduce manual intervention, ensure the stability and reliability of the demagnetization effect, and expand the application scenarios of magnetic shielding technology in precision fields.

[0055] In one possible implementation of the above embodiments, please refer to Figure 2 , Figure 2 This is an exemplary schematic diagram of the specific architecture of a demagnetizing circuit for an adaptive active adjustment magnetic shielding device according to an embodiment of this disclosure. Figure 2 As shown, in the demagnetization circuit 200 of the adaptive active adjustment magnetic shielding device, the control acquisition system 101 includes a residual magnetism acquisition unit 101a. The residual magnetism acquisition unit 101a is used to pre-acquire the initial residual magnetism data of each preset feature point on the surface of the shielding layer of the magnetic shielding device 102 during the calibration stage, establish the preset residual magnetism expected value of each feature point during the demagnetization process, and form a feature point residual magnetism judgment basis library. The residual magnetism acquisition unit 101a does not participate in the acquisition of residual magnetism state after the calibration stage is completed.

[0056] In this embodiment, during the calibration stage, multiple preset feature points are preset on the surface of the shielding layer of the magnetic shielding device 102 according to preset rules.

[0057] The residual magnetism acquisition unit 101a is activated only during the calibration phase. The residual magnetism acquisition unit 101a contains a space magnetic field measurement device. Figure 2 (Not specifically shown in the drawing), such as weak magnetic field detection equipment.

[0058] Specifically, the residual magnetism acquisition unit 101a pre-sets the theoretical characteristic point positions and the theoretical residual magnetism values ​​corresponding to each demagnetization stage based on the material properties and design parameters of the magnetic shielding device 102; the residual magnetism acquisition unit 101a performs point-by-point actual measurement of the above-mentioned theoretical characteristic point positions through a space magnetic field measuring device to obtain the actual initial residual magnetism values ​​at each theoretical characteristic point position; the actual initial residual magnetism values ​​are compared with the theoretical residual magnetism values ​​to generate a theoretical-actual residual magnetism curve;

[0059] The residual magnetism acquisition unit 101a uses curve fitting and deviation analysis to select the position that best represents the overall demagnetization effect of the actual residual magnetism state, which is used as the real residual magnetism feature point of the magnetic shielding device 102. Based on the actual initial residual magnetism value of the real residual magnetism feature point, combined with the demagnetization target, the actual expected residual magnetism value that each real feature point should reach at different stages of the demagnetization process is determined and integrated into the feature point residual magnetism judgment basis library.

[0060] Furthermore, after the construction of the feature point residual magnetism determination basis library is completed, the residual magnetism acquisition unit 101a will logically no longer participate in the subsequent operation stage.

[0061] At this time, the parameters of the feature point residual magnetism determination base library will be synchronously transmitted to other modules of the control and acquisition system 101 as the core reference during the operation phase.

[0062] The adaptive active adjustment magnetic shielding device demagnetization circuit and apparatus of the above embodiments of this disclosure establish a dedicated feature point residual magnetism determination basis library for each magnetic shielding device during the calibration stage, enabling precise quantitative standards for the dynamic adjustment of the demagnetization process and improving the accuracy of demagnetization parameter optimization. The residual magnetism acquisition unit 101a is only activated during the calibration stage and is logically deactivated after the task is completed, thereby avoiding long-term occupation of system resources and achieving lightweight and efficient system operation.

[0063] In one possible implementation of the above embodiments, please refer to Figure 3 , Figure 3 This is an exemplary schematic diagram of the specific architecture of a demagnetizing circuit for another adaptive active adjustment magnetic shielding device according to an embodiment of this disclosure. Figure 3 As shown, in the demagnetization circuit 300 of the adaptive active adjustment magnetic shielding device, 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.

[0064] The demagnetizing signal acquisition unit 101b is used to acquire the demagnetizing process electrical signal of the energy output identification system 103 at preset feature points, so as to monitor the energy output status in real time during the demagnetizing process; wherein, the demagnetizing process electrical signal is the voltage parameter and current parameter of the AC demagnetizing signal;

[0065] The pulse signal acquisition unit 101c is used to acquire the excitation pulse signal output by the energy output identification system 103 and the remanence state fed back by the preset feature point under the excitation pulse signal;

[0066] The signal processing unit 101d is used to receive the electrical signal, excitation pulse signal and residual magnetism state of the demagnetization process, call the residual magnetism judgment basis library of characteristic points, compare the residual magnetism state with the expected residual magnetism value in the residual magnetism judgment basis library, generate control instructions for adjusting the demagnetization parameters at the next moment based on the comparison results, and send them to the energy output identification system 103 via the controller 101e.

[0067] In this embodiment, the operation phase includes a demagnetization mode and a residual magnetism detection mode.

[0068] The demagnetizing signal acquisition unit 101b is used to acquire the demagnetizing process electrical signal containing voltage and current data at the preset feature point during the detection time bound to the preset feature point during the demagnetizing process, and transmit the demagnetizing process electrical signal to the signal processing unit 101d to determine whether the demagnetizing energy is stable.

[0069] The pulse signal acquisition unit 101c is used to acquire bidirectional signals, including the excitation pulse signal output by the energy output identification system 103 and the electrical signal feedback generated by the residual magnetism of the preset feature point of the magnetic shielding device 102 under the action of the excitation pulse signal.

[0070] The pulse signal acquisition unit 101c transmits a bidirectional signal containing the excitation pulse signal and the remanence state to the signal processing unit 101d.

[0071] Furthermore, the signal processing unit 101d is used to determine the residual magnetism state based on the feedback of the electrical signal; it calls the residual magnetism determination basis library of feature points, compares the residual magnetism state with the expected residual magnetism value in the feature point residual magnetism determination basis library, and generates a control command for adjusting the demagnetization parameters at the next moment based on the comparison result.

[0072] For example, the signal processing unit 101d determines that the residual magnetism state of a preset feature point is 10% higher than the expected residual magnetism value in the feature point residual magnetism determination base library, and generates a control command to increase the demagnetization energy.

[0073] Furthermore, the controller 101e receives the control command generated by the signal processing unit 101d and sends the control command to the energy output identification system 103 to control the switching between demagnetization mode and residual magnetism detection mode.

[0074] Through the adaptive active adjustment magnetic shielding device demagnetization circuit and apparatus of the above embodiments of this disclosure, the demagnetization signal acquisition unit 101b captures the voltage and current parameters of the AC demagnetization signal in real time, dynamically monitors the energy output stability, and avoids incomplete demagnetization due to energy anomalies; the pulse signal acquisition unit 101c simultaneously acquires bidirectional signals of excitation pulse and residual magnetism feedback, and the combination of the two enables full-chain monitoring of the demagnetization process, improving the accuracy of detection and control. The controller receives control commands and sends them to the energy output identification system to achieve effective control of the switching between demagnetization mode and residual magnetism detection mode, ensuring the timeliness and stability of the switching between the two modes.

[0075] In one possible implementation of the above embodiments, please refer to Figure 4 , Figure 4 This is an exemplary schematic diagram of the specific architecture of another adaptive active adjustment magnetic shielding device demagnetization circuit according to an embodiment of this disclosure. Figure 4 As shown, in the demagnetization circuit 400 of the adaptive active adjustment magnetic shielding device, the energy output identification system 103 includes a zero-crossing analysis and identification unit 103a. The zero-crossing analysis and identification unit 103a is used to identify the voltage zero-crossing point and the current zero-crossing point of the AC demagnetization signal. At the voltage zero-crossing point, the energy output identification system 103 stops outputting the AC demagnetization signal, and at the current zero-crossing point, 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 switch from demagnetization to residual magnetism detection mode.

[0076] In this embodiment, the zero-crossing analysis and identification unit 103a is used to monitor the voltage and current changes of the AC demagnetization signal in real time during demagnetization mode, and to capture the voltage zero-crossing point and the current zero-crossing point.

[0077] Specifically, the zero-crossing analysis and identification unit 103a is used to trigger a control command at the voltage zero-crossing point, causing the energy output identification system to stop outputting the AC demagnetization signal, cut off the demagnetization energy, and avoid voltage surges interfering with subsequent detection; at the current zero-crossing point (because the magnetic shielding device 102 is an inductive load, the current needs to decay naturally to zero), a switching command is triggered to disconnect the magnetic shielding device 102 from the AC demagnetization signal circuit, and at the same time connect the connection with the excitation pulse signal circuit, completing the switch from demagnetization mode to residual magnetism detection mode.

[0078] Here, cutting off the output at the voltage zero-crossing point ensures that there is no voltage surge when the demagnetizing energy stops; switching the circuit at the current zero-crossing point avoids arcing or energy interference caused by sudden current changes, ensuring that residual magnetism detection is carried out in a pure environment without external energy excitation, which can improve detection accuracy.

[0079] As an example, please refer to Figure 5 , Figure 5This is an exemplary schematic diagram illustrating the operation process of the adaptive active modulation magnetic shielding device 102 in the demagnetization circuit of an adaptive active adjustment magnetic shielding device according to an embodiment of this disclosure. Figure 5 As shown, the horizontal axis is the time axis, and the vertical axis is the amplitude of the AC demagnetization signal.

[0080] Among them, the energy output identification system 103 outputs an AC demagnetization signal to the magnetic shielding device 102, causing the residual magnetism on the shielding layer of the magnetic shielding device 102 to gradually decrease with the signal period. Figure 5 The amplitude of the medium waveform gradually decreases, reflecting the demagnetizing effect.

[0081] The zero-crossing analysis and identification unit 103a identifies the voltage zero-crossing point of the AC demagnetizing signal and controls the output of the AC demagnetizing signal to stop. Simultaneously, the zero-crossing analysis and identification unit 103a identifies the current zero-crossing point, switches the circuit at the current zero-crossing point, outputs an excitation pulse signal, and detects the residual magnetism state at a preset characteristic point. Figure 5 The rectangular area in the middle is the switching window between demagnetization mode and residual magnetism detection mode.

[0082] The control and acquisition system 101 compares the residual magnetism detection results with the residual magnetism judgment basis library of feature points, calculates the demagnetization parameter deviation and generates control commands, adjusts the AC demagnetization signal parameters for the next stage, so that the subsequent demagnetization signal is adapted to the new parameters, and repeats the above operation at the next preset feature point to complete the demagnetization.

[0083] Through the adaptive active adjustment magnetic shielding device 102 demagnetization circuit and apparatus of the above embodiments of this disclosure, the zero-crossing analysis and identification unit 103a provides key guarantees for the accuracy of residual magnetism detection and the stability of the demagnetization process through precise zero-crossing identification and step-by-step control.

[0084] In one possible implementation of the above embodiments, please refer to Figure 6 , Figure 6 This is an exemplary schematic diagram of the specific architecture of a demagnetizing circuit for another adaptive active adjustment magnetic shielding device according to an embodiment of this disclosure. Figure 6 As shown, in the demagnetization circuit 600 of the adaptive active adjustment magnetic shielding device, the energy output identification system 103 further includes a power switching unit 103b. The power switching unit 103b is used to disconnect the AC demagnetization signal from the magnetic shielding device 102 at the current zero crossing point when triggered by the zero-crossing analysis and identification unit 103a, and connect the magnetic shielding device 102 to the excitation pulse signal.

[0085] In this embodiment, the power switching unit 103b is the core execution component responsible for physical circuit switching in the energy output identification system 103. Its function is to realize the path switching between the magnetic shielding device 102 and the AC demagnetization signal circuit and the excitation pulse signal circuit under the control of the zero-crossing analysis and identification unit 103a.

[0086] Here, the power switching unit 103b can essentially be a group of controlled switching devices (such as relays, semiconductor switches, etc.) connected to the AC demagnetizing signal circuit and the excitation pulse signal circuit respectively.

[0087] When the power switching unit 103b detects the current zero-crossing point of the AC demagnetizing signal, it immediately performs the following actions: disconnecting the AC demagnetizing signal from the magnetic shielding device 102 to cut off the demagnetizing energy input; and simultaneously connecting the excitation pulse signal to the magnetic shielding device 102 to provide a signal path for residual magnetism detection.

[0088] Because the shielding layer of the magnetic shielding device 102 is inductive, the current in the magnetic shielding device 102 cannot change instantaneously. Forcibly cutting it off may generate a high-voltage arc, thereby interfering with the detection or damaging the equipment. Therefore, the switching timing of the power switching unit 103b is strictly tied to the current zero-crossing point to ensure that there is no current surge when the demagnetizing signal circuit is disconnected, avoiding arcing or electromagnetic interference; and when the excitation pulse signal circuit is connected, the magnetic shielding device is in a state without residual current. At this time, injecting the excitation pulse signal can accurately excite and collect the residual magnetic response, ensuring detection accuracy.

[0089] Through the adaptive active adjustment magnetic shielding device demagnetization circuit and apparatus of the above embodiments of this disclosure, the power switching unit 103b strictly performs path switching at the current zero-crossing point, realizing the orderly conversion between the demagnetization circuit and the detection circuit, thereby ensuring the accuracy of circuit switching. This solves the problem of equipment damage and signal interference that may be caused by improper switching at the hardware level, and enhances the stability of the demagnetization circuit under complex operating conditions.

[0090] In one possible implementation of the above embodiments, please refer to Figure 7 , Figure 7 This is an exemplary schematic diagram of the specific architecture of a demagnetizing circuit for another adaptive active adjustment magnetic shielding device according to an embodiment of this disclosure. Figure 7 As shown, in the demagnetization circuit 700 of the adaptive active adjustment magnetic shielding device, 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 AC demagnetization signal, and the pulse signal generator 103d is used to output an excitation pulse signal.

[0091] The zero-crossing analysis and identification unit 103a controls the demagnetizing power generator 103c to stop outputting the AC demagnetizing signal and simultaneously triggers the pulse signal generator 103d to output the excitation pulse signal.

[0092] In this embodiment, the zero-crossing analysis and identification unit 103a synchronously controls the operation of the demagnetizing power generator 103c and the pulse signal generator 103d. Specifically, at the voltage zero-crossing point, the AC demagnetizing signal output of the demagnetizing power generator 103c is cut off, and at the same time, the pulse signal generator 103d is triggered to output an excitation pulse signal. This ensures that the timing of the demagnetizing signal stopping and the detection signal starting is precisely matched, avoiding the superposition and interference of the two signals. This ensures that the residual magnetism detection is carried out in an environment without demagnetizing energy interference, thereby improving the detection accuracy.

[0093] Through the adaptive active adjustment magnetic shielding device demagnetization circuit and apparatus of the above embodiments of this disclosure, the AC demagnetization signal output by the demagnetizing power generator 103c provides core energy for the demagnetization of the magnetic shielding device 102, and its parameters can be adjusted according to control commands to adapt to the needs of different demagnetization stages; the excitation pulse signal output by the pulse signal generator 103d provides an active injection signal for residual magnetism detection, ensuring that the residual magnetism response of the preset feature points of the magnetic shielding device 102 can be effectively excited, providing a reliable input for residual magnetism state determination.

[0094] This invention also provides an adaptive active adjustment magnetic shielding device demagnetization device. The adaptive active adjustment magnetic shielding device demagnetization circuit of the above-described embodiments can be applied in the adaptive active adjustment magnetic shielding device demagnetization device as a hardware unit in the adaptive active adjustment magnetic shielding device demagnetization device.

[0095] Although embodiments of the present disclosure have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations 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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