A demagnetizing power supply noise reduction and DC blocking circuit and device for magnetically shielded spaces

Abstract

This disclosure relates to the field of magnetic shielding technology, and discloses a noise reduction and DC blocking circuit and device for demagnetizing power supply in magnetically shielded spaces. A multi-switch matrix is ​​configured as follows: during the energy application phase of fine demagnetization, the output terminal of the DC blocking element is connected to the demagnetizing coil, while the induced energy absorption module is disconnected. The DC blocking element is used to block the DC component in the output of the demagnetizing power supply. In the demagnetization post-energy disconnection phase, the physical connection between the demagnetizing coil and the DC blocking element and the demagnetizing power supply is disconnected. The output terminal of the DC blocking element is connected to the induced energy absorption module to dissipate the coupling interference energy generated by the demagnetizing power supply during standby. By blocking the DC component in the output of the demagnetizing power supply during the energy application phase of fine demagnetization using the DC blocking element, the DC bias at the tail end of the demagnetizing energy attenuation process is suppressed, thereby improving the demagnetizing effect.

Description

Technical Field

[0001] This invention relates to the field of magnetic shielding space technology, specifically to a demagnetizing power supply noise reduction and DC blocking circuit and device for magnetic shielding spaces. Background Technology

[0002] With the widespread application of magnetic shielding technology in the field of precision equipment, the demagnetizing power supply, as a key support of the magnetic shielding system, directly determines the magnetic field stability of the magnetic shielding space through its output noise and DC bias control accuracy. Application scenarios are increasingly demanding low interference requirements at the end of demagnetization.

[0003] In related technologies, existing noise reduction and DC blocking schemes for demagnetizing power supplies mostly rely on dual-power supply regulation or feedback compensation algorithms. These schemes suffer from high costs and incomplete suppression of DC bias at the demagnetizing tail. Furthermore, they are difficult to prevent the standby noise of the power supply from affecting the demagnetizing coil through loops or spatial coupling, leading to magnetic field fluctuations in the magnetic shielding layer. Therefore, effectively isolating the DC component, cutting off the interference transmission path, and consuming the remaining energy at the end of the demagnetizing process have become urgent technical problems that need to be solved to improve the magnetic shielding effect. Summary of the Invention

[0004] In view of this, the present invention provides a demagnetizing power supply noise reduction and DC blocking circuit and device for magnetically shielded spaces, in order to solve the problem of how to effectively isolate the DC component, cut off the interference transmission path and consume the remaining energy at the end of the demagnetizing process, thereby improving the magnetic shielding effect.

[0005] This disclosure provides a noise reduction and DC blocking circuit for a demagnetizing power supply in a magnetically shielded space. The circuit includes: a DC blocking element, a multi-switch matrix, and an inductive energy absorption module. One end of the DC blocking element is connected to the demagnetizing power supply, and the other end is connected to the input terminal of the multi-switch matrix. A first output terminal of the multi-switch matrix is ​​connected to the demagnetizing coil, and a second output terminal is connected to the inductive energy absorption module. The multi-switch matrix is ​​configured to: during the energy application phase of fine demagnetization, connect the output terminal of the DC blocking element to the demagnetizing coil while disconnecting the inductive energy absorption module, wherein the DC blocking element is used to block the DC component in the output of the demagnetizing power supply; during the demagnetization post-energy disconnection phase, disconnect the physical connection between the demagnetizing coil and the DC blocking element and the demagnetizing power supply; and connect the output terminal of the DC blocking element to the inductive energy absorption module to dissipate the coupling interference energy generated by the demagnetizing power supply through the coupling path during standby.

[0006] In another aspect, this disclosure provides a demagnetizing power supply noise reduction and DC blocking device for a magnetically shielded space, which includes the aforementioned demagnetizing power supply noise reduction and DC blocking circuit for a magnetically shielded space.

[0007] The demagnetizing power supply noise reduction and DC blocking circuit and device for magnetically shielded spaces disclosed in the above embodiments of this invention, by using a DC blocking element to block the DC component in the output of the demagnetizing power supply during the energy application stage of fine demagnetization, suppresses the DC bias at the tail end of the demagnetizing attenuation energy output process, thereby improving the demagnetizing effect. By using a multi-switch switching matrix to disconnect the physical connection between the demagnetizing coil and the DC blocking element and the demagnetizing power supply during the demagnetizing stage after energy disconnection, the problem of power supply standby noise being transmitted to the demagnetizing coil through the loop and causing magnetic field fluctuations in the magnetic shielding layer is avoided, thus physically isolating the direct interference path between the demagnetizing power supply and the demagnetizing coil. By using an inductive energy absorption module to consume the interference energy generated by the demagnetizing power supply during standby through the coupling path during the demagnetizing stage, the problem of residual power supply energy acting on the demagnetizing coil through the inductive path and causing partial magnetization of the magnetic shielding layer is avoided, thus completely eliminating the impact of non-loop transmitted coupling interference on the demagnetizing effect. Attached Figure Description

[0008] 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.

[0009] Figure 1 This is an exemplary schematic diagram of the architecture of a demagnetizing power supply noise reduction and DC blocking circuit for a magnetically shielded space according to an embodiment of this disclosure.

[0010] Figure 2 This is an exemplary schematic diagram of a specific architecture of a demagnetizing power supply noise reduction and DC blocking circuit for a magnetically shielded space according to an embodiment of this disclosure.

[0011] Figure 3 This is an exemplary schematic diagram of the specific architecture of a demagnetizing power supply noise reduction and DC blocking circuit for a magnetically shielded space in the energy application stage of fine demagnetization, according to an embodiment of this disclosure.

[0012] Figure 4 This is an exemplary schematic diagram of the specific architecture of a demagnetizing power supply noise reduction DC blocking circuit for a magnetically shielded space in the post-demagnetization stage after energy disconnection, according to an embodiment of this disclosure.

[0013] Figure 5 This is an exemplary schematic diagram of another specific architecture of a demagnetizing power supply noise reduction and DC blocking circuit for a magnetically shielded space according to an embodiment of this disclosure.

[0014] Figure 6 This is an exemplary schematic diagram of the specific architecture of another demagnetizing power supply noise reduction and DC blocking circuit for a magnetically shielded space in the energy application stage of fine demagnetization, according to another embodiment of this disclosure.

[0015] Figure 7 This is an exemplary schematic diagram of the specific architecture of another demagnetizing power supply noise reduction DC blocking circuit for a magnetically shielded space in the post-demagnetization stage after energy disconnection, according to another embodiment of this disclosure. Detailed Implementation

[0016] With the widespread application of magnetic shielding technology in the field of precision equipment, the demagnetizing power supply, as a key support of the magnetic shielding system, directly determines the magnetic field stability of the magnetic shielding space through its output noise and DC bias control accuracy. Application scenarios are increasingly demanding low interference requirements at the end of demagnetization.

[0017] In the first related technology, the excitation transformer power supply is changed by delaying the change rate of the field-effect transistor. When the required conversion voltage is low or high, the required output voltage is obtained by coupling the DC input power supply UI in reverse to obtain the power conversion, or by coupling the two DC input power supplies UI to obtain the power conversion. Finally, after differential mode anti-interference by the output power isolation circuit and transformer isolation, a stable required output voltage is provided to the load.

[0018] In the second related technology, a DC bias correction circuit is disclosed, mainly composed of a microcontroller unit (MCU) chip and a two-stage amplifier circuit. The differential quadrature signal is input to the first-stage amplifier circuit, realizing differential-to-single-ended operation and outputting two quadrature signals Q and I; the second-stage amplifier circuit obtains the corrected in-phase and quadrature signals. This can sufficiently amplify the regulated baseband signal without causing the baseband amplifier output to saturate, thereby improving the signal-to-noise ratio of the output baseband signal and reducing baseband phase demodulation error.

[0019] Both the first and second related technologies mentioned above require a dual-power supply control scheme, which results in high costs.

[0020] Furthermore, the third related technology includes a DC offset removal device and method that can detect and remove DC offset with high precision within a pulse train and with a small processing volume.

[0021] The fourth related technology discloses a DC bias cancellation method and apparatus. The method includes: performing least squares DC estimation on the input signal to obtain a DC bias estimate; obtaining a compensation signal for the input signal based on the DC bias estimate; derotating the compensation signal to obtain a first derotated signal; and derotating the input signal to obtain a second derotated signal; comparing the signal-to-noise ratio estimate of the first derotated signal and the signal-to-noise ratio estimate of the second derotated signal; and determining the DC bias cancellation output signal based on the comparison result.

[0022] The fifth related technology provides a method for calculating the Euclidean distance between pairs of demodulated symbols in multiple demodulated symbols based on Quadrature Phase Shift Keying (QPSK) modulation; determining four sets from the multiple demodulated symbols, each set corresponding to a modulation direction of QPSK modulation; and performing DC bias calculation and compensation based on the precise estimation point.

[0023] The sixth related technology provides a device for eliminating DC bias and adjusting gain, comprising a first amplifier module, a first low-pass filter circuit, and a second amplifier module. The output signal of the first amplifier module is A times the input signal. The input of the first low-pass filter is coupled to the output of the first amplifier module to output the DC bias in the received signal and amplify the DC bias by a factor of B. The second amplifier module includes a first input, a second input, and an output. Its first input is coupled to the output of the first low-pass filter, its second input is coupled to a positive input signal, and its output signal is the sum of C1 times the first input signal and C2 times the second input signal, satisfying the following formula: A*B*C1=-C2.

[0024] The aforementioned third to sixth related technologies all achieve DC bias elimination based on feedback signals and adaptive algorithms. They do not involve technical solutions for cutting off energy transfer loops and consuming residual energy, and therefore cannot fully solve the interference problems faced when demagnetizing the magnetic shielding space, making it difficult to guarantee the magnetic field stability of the magnetic shielding layer.

[0025] Furthermore, none of the aforementioned technologies are designed specifically for demagnetizing power supplies for magnetic shielding devices. The power during the demagnetizing process varies from a high initial power to a low final power, placing specific demands on DC bias and noise control. The aforementioned technologies do not consider the conflicting demands and extreme performance requirements arising from these power variations. Therefore, in magnetically shielded applications, they cannot adequately meet the noise reduction and DC blocking requirements of the demagnetizing power supply at different stages, making it difficult to effectively improve the demagnetizing effect.

[0026] To address the aforementioned problems, various embodiments of this disclosure provide a noise reduction and DC blocking circuit for a demagnetizing power supply in a magnetically shielded space. The circuit includes: a DC blocking element, a multi-switch matrix, and an inductive energy absorption module. One end of the DC blocking element is connected to the demagnetizing power supply, and the other end is connected to the input terminal of the multi-switch matrix. A first output terminal of the multi-switch matrix is ​​connected to the demagnetizing coil, and a second output terminal is connected to the inductive energy absorption module. The multi-switch matrix is ​​configured to: during the energy application phase of fine demagnetization, connect the output terminal of the DC blocking element to the demagnetizing coil while simultaneously disconnecting the inductive energy absorption module, wherein the DC blocking element is used to block the DC component in the output of the demagnetizing power supply; during the demagnetization post-energy disconnection phase, disconnect the physical connection between the demagnetizing coil and the DC blocking element and the demagnetizing power supply; and connect the output terminal of the DC blocking element to the inductive energy absorption module to dissipate the coupling interference energy generated by the demagnetizing power supply during standby through the coupling path.

[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 power supply noise reduction and DC blocking circuit for a magnetically shielded space, according to an embodiment of this disclosure. Figure 1 As shown, the demagnetizing power supply noise reduction DC blocking circuit 100 for magnetically shielded space includes: DC blocking element 101, multi-switch switching matrix 102 and inductive energy absorption module 103. One end of DC blocking element 101 is connected to the demagnetizing power supply, and the other end is connected to the input terminal of multi-switch switching matrix 102.

[0029] In this embodiment, the DC blocking element 101 is a functional component in the circuit used to block the DC component in the demagnetizing power supply output. Specifically, it is used to suppress the DC bias at the tail of the demagnetizing process during the energy application phase, thereby preventing the DC bias from affecting the stability of the magnetic shielding layer. The DC blocking element 101 may include various devices with DC blocking functions.

[0030] The multi-switch switching matrix 102 is a switching unit composed of multiple switching elements (such as relays, controllable switches, etc.) in the circuit. By controlling the on / off state of the switching elements, it enables selective conduction / disconnection of paths in the circuit. Specifically, it is used to switch the connection relationship between the DC blocking element 101 and the demagnetizing coil, and between the DC blocking element 101 and the inductive energy absorption module 103 at different working stages.

[0031] The inductive energy absorption module 103 is a module in the circuit used to absorb and consume the interference energy generated by the demagnetizing power supply through the coupling path when it is in standby mode. It can include a variety of devices with energy consumption function. Specifically, it is used to release the remaining power supply energy or standby noise through energy consumption, so as to avoid it from affecting the demagnetizing coil and magnetic shielding layer through spatial or loop coupling.

[0032] Among them, the demagnetizing power supply is a power supply device that provides energy for the demagnetizing process of the magnetically shielded space, and its output energy exhibits dynamic changes "from high power to low power".

[0033] Here, the working phase may include the energy application phase for fine demagnetization and the post-demagnetization phase after energy disconnection.

[0034] It is understandable that the demagnetization energy of a magnetic shielding device during the demagnetization process is often divided into three stages. The first stage is the magnetic saturation stage (used to quickly eliminate most of the remaining magnetic field in the magnetic shielding device), the second stage is the repeated attenuation stage (used to repeatedly weaken the remaining magnetic field by outputting alternating energy through the demagnetizing power supply, so that the magnetic field strength gradually approaches the target value from a higher level), and the third stage is the fine demagnetization stage (used to achieve high-precision control of the magnetic field of the magnetic shielding device).

[0035] Because the fine demagnetization stage, which is the third stage, is extremely sensitive to interference such as DC bias and current noise, the fine demagnetization stage is further divided into the energy application stage of fine demagnetization and the demagnetization post-energy disconnection stage.

[0036] Here, DC bias refers to the DC component superimposed on the AC demagnetizing signal in the energy output of the demagnetizing power supply.

[0037] In the fine demagnetization energy application stage, the demagnetizing power supply outputs low-power energy (e.g., current less than 5 amps) to finely compensate and calibrate the residual magnetic field. During this stage, it is crucial to suppress DC bias to ensure a pure applied energy waveform and avoid DC component interference with fine adjustment, which directly affects the final demagnetization accuracy. The post-demagnetization stage, where the energy is disconnected (i.e., the demagnetizing power supply stops outputting energy to the demagnetizing coil), is still in standby mode despite the energy application stopping. It may contain residual energy or background noise, which can act on the demagnetizing coil through loop coupling or spatial induction, causing the magnetic shielding layer to be weakly magnetized again, thus destroying the achieved fine demagnetization effect. Therefore, this stage requires the multi-switch switching matrix 102 to disconnect the physical connection between the demagnetizing coil and the power supply, and the inductive energy absorption module 103 to consume the remaining interference energy, achieving complete isolation.

[0038] Furthermore, one end of the DC blocking element 101 is connected to the demagnetizing power supply, so that all the energy output by the demagnetizing unit passes through the DC blocking element 101 to filter out the DC bias and prevent the DC component from being directly transmitted to the demagnetizing coil and affecting the demagnetizing effect.

[0039] The other end of the DC blocking element 101 is connected to the input terminal of the multi-switch switching matrix 102.

[0040] The first output terminal of the multi-switch matrix 102 is connected to the demagnetizing coil, and the second output terminal is connected to the inductive energy absorption module 103.

[0041] In this embodiment, the other end of the DC blocking element 101 is connected to the input end of the multi-switch switching matrix 102, the first output end of the multi-switch switching matrix 102 is connected to the demagnetizing coil, and the second output end is connected to the inductive energy absorption module 103, so that the multi-switch switching matrix 102 selectively directs the energy processed by the DC blocking element 101 to the demagnetizing coil or the inductive energy absorption module 103 according to the working stage.

[0042] The multi-switch switching matrix 102 is configured to connect the output of the DC blocking element 101 to the demagnetizing coil during the energy application phase of fine demagnetization, while disconnecting the inductive energy absorption module 103, wherein the DC blocking element 101 is used to block the DC component in the demagnetizing power supply output.

[0043] In this embodiment, during the energy application stage of fine demagnetization, the output terminal of the DC blocking element 101 is connected to the demagnetizing coil through the first output terminal of the multi-switch switching matrix 102 to form the main energy output path.

[0044] Here, the main energy output path ensures that during the energy application stage of fine demagnetization, the energy processed by the DC blocking element 101 is accurately delivered to the demagnetizing coil, directly acting on the magnetic shielding layer to achieve fine adjustment of the remaining magnetic field.

[0045] In addition, disconnecting the induction energy absorption module 103 prevents the induction energy absorption module 103 from diverting energy or interfering with normal energy output, ensuring that the energy obtained by the demagnetizing coil is concentrated and stable.

[0046] After the demagnetization phase when the energy is disconnected, the physical connection between the demagnetizing coil and the DC blocking element 101 and the demagnetizing power supply is disconnected; the output terminal of the DC blocking element 101 is connected to the inductive energy absorption module 103 to consume the coupling interference energy generated by the demagnetizing power supply through the coupling path when it is in standby mode.

[0047] In this embodiment, the second output terminal of the multi-switch switching matrix 102 is connected to the inductive energy absorption module 103 to form an interference energy consumption path. This path provides an access point for the inductive energy absorption module 103, so that the inductive energy absorption module 103 absorbs and consumes the remaining energy and standby noise of the demagnetizing power supply after the energy is disconnected, thus avoiding the influence of the demagnetizing coil through coupling.

[0048] Furthermore, the switching action of the multi-switch switching matrix 102 enables complete electrical isolation between the demagnetizing coil and the main circuit (including the DC blocking element 101 and the demagnetizing power supply).

[0049] Here, since the degaussing power supply still generates background noise energy in standby mode, if the degaussing coil remains connected to the main circuit, the background noise energy may be conducted to the degaussing coil through the circuit, thereby causing magnetic field fluctuations in the magnetic shielding layer. By disconnecting the degaussing coil from the main circuit, the interference transmission of background noise energy can be blocked.

[0050] The demagnetizing power supply noise reduction and DC blocking circuit and device for magnetically shielded spaces according to the above embodiments of this disclosure, by using the DC blocking element 101 to block the DC component in the output of the demagnetizing power supply during the energy application stage of fine demagnetization, the DC bias at the end of the demagnetizing attenuation energy output process is difficult to suppress, thereby improving the demagnetizing effect. By using the multi-switch switching matrix 102 to disconnect the physical connection between the demagnetizing coil and the DC blocking element 101 and the demagnetizing power supply during the demagnetizing stage after energy disconnection, the problem of power supply standby noise being transmitted to the demagnetizing coil through the loop and causing magnetic field fluctuations in the magnetic shielding layer is avoided, thus physically isolating the direct interference path between the demagnetizing power supply and the demagnetizing coil. By using the inductive energy absorption module 103 to consume the interference energy generated by the demagnetizing power supply during standby through the coupling path during the demagnetizing stage, the problem of residual power supply energy acting on the demagnetizing coil through the inductive path and causing partial magnetization of the magnetic shielding layer is avoided, thus completely eliminating the impact of non-loop transmitted coupling interference on the demagnetizing effect.

[0051] In one possible implementation of the above embodiments, the DC blocking element 101 includes at least one of a DC blocking capacitor array or an isolation transformer.

[0052] In this embodiment, the capacitors have DC blocking characteristics. By combining multiple capacitors in an array and adapting them to the power requirements of the demagnetizing power supply, the DC component is blocked while ensuring that the AC demagnetizing signal is effectively transmitted to the demagnetizing coil. The isolation transformer transmits AC signals through the principle of electromagnetic induction. Since there is no direct electrical connection between the primary and secondary coils of the isolation transformer, it naturally possesses the function of DC isolation.

[0053] The DC blocking element 101 can be a DC blocking capacitor array or an isolation transformer alone, or a combination of a DC blocking capacitor array and an isolation transformer.

[0054] The demagnetizing power supply noise reduction and DC blocking circuit and device for magnetically shielded spaces disclosed in the above embodiments of this disclosure features a simple structure and low cost for the DC blocking capacitor array and isolation transformer. It achieves efficient DC blocking without complex algorithmic logic, simplifying circuit design and reducing implementation difficulty while ensuring demagnetizing accuracy. Using the DC blocking capacitor array alone is suitable for cost-sensitive demagnetizing scenarios with moderate power requirements. The capacitor combination allows for flexible matching of different demagnetizing frequencies and powers, simplifying the circuit structure. Using the isolation transformer alone is suitable for scenarios requiring strong electrical isolation, meeting extreme accuracy requirements. Combining both allows for the balance between the high-frequency response of the capacitors and the strong isolation of the transformer, addressing DC bias suppression requirements under complex operating conditions. This makes the circuit applicable to most demagnetizing power supply types, expanding the application range of the technical solution.

[0055] In one possible implementation of the above embodiments, the inductive energy absorption module 103 includes an LCR array or an element with energy dissipation function for absorbing and consuming coupled interference energy.

[0056] In this embodiment, the inductor-capacitor-resistor (LCR) array is a combination circuit composed of inductors (L), capacitors (C), and resistors (R). Through specific parameter matching, it converts coupled interference energy into heat energy and other forms of energy for consumption.

[0057] Components with energy-consuming functions can encompass other devices that directly consume energy, achieving the attenuation of interference energy through their own electrical characteristics (such as the heat loss of resistors and the energy conversion of devices).

[0058] For example, components with energy-consuming functions may include, but are not limited to, resistors and energy-consuming diodes.

[0059] Furthermore, LCR arrays can be applied to scenarios with strong interference energy and well-defined frequency characteristics, achieving efficient energy dissipation through parameter optimization; other components with energy dissipation functions can be applied to low-power interference scenarios (such as millivolt-level residual energy), while simplifying the circuit structure (reducing the number of components).

[0060] Through the demagnetizing power supply noise reduction and DC blocking circuit and device for magnetically shielded spaces disclosed in the above embodiments, the inductive energy absorption module 103 cooperates with the multi-switch switching matrix 102. In the demagnetizing stage after energy disconnection, the multi-switch switching matrix 102 cuts off the circuit transmission path, and the inductive energy absorption module 103 consumes the inductive coupling energy, achieving dual protection of complete isolation and active energy dissipation, thus improving demagnetizing stability. The inductive energy absorption module 103 has a simple structure and is easy to integrate, requiring no complex control logic, reducing circuit complexity and cost while ensuring effectiveness.

[0061] In one possible implementation of the above embodiments, the DC blocking element 101 is configured based on the demagnetizing frequency during the energy application stage of fine demagnetization, and filters out the DC component in the demagnetizing power supply output through its DC blocking and AC passing characteristics.

[0062] In the demagnetizing stage after energy disconnection, the multi-switch switching matrix 102 disconnects the demagnetizing coil from the DC blocking element 101 and the demagnetizing power supply, while simultaneously connecting the DC blocking element 101 to the LCR array. The LCR array consumes the coupling interference energy of the demagnetizing power supply.

[0063] In this embodiment, during the energy application stage of fine demagnetization, the DC blocking element 101 needs to be parameter-configured based on the demagnetization frequency output by the demagnetizing power supply to match the frequency characteristics of the AC demagnetizing signal. The configured parameters may include, but are not limited to, capacitor value, transformer turns ratio, etc.

[0064] After frequency adaptation, the DC blocking element 101 allows a clean AC demagnetizing signal to pass through, ensuring that the AC demagnetizing signal is effectively transmitted to the demagnetizing coil, thus meeting the requirement for high-precision calibration of the residual magnetic field of the magnetic shielding layer.

[0065] Furthermore, in the post-demagnetization stage after energy disconnection, the multi-switch switching matrix 102 achieves dual operation by controlling the on / off state of its internal switches:

[0066] Physical isolation of the demagnetizing coil: Disconnect the connection path between the DC blocking element 101 and the demagnetizing coil, so that the electrical connection between the demagnetizing coil and the DC blocking element 101 and the demagnetizing power supply is completely cut off, and the path of the background noise of the demagnetizing power supply being transmitted to the demagnetizing coil through the circuit is blocked.

[0067] Connecting DC blocking element 101 and inductive energy absorption module 103: Simultaneously connect the output terminal of DC blocking element to inductive energy absorption module 103, so that inductive energy absorption module 103 is connected to the circuit and becomes a channel for consuming coupled interference energy.

[0068] Through the demagnetizing power supply noise reduction DC blocking circuit and device for magnetically shielded space in the above embodiments of this disclosure, the DC blocking element 101 selectively filters out DC bias during the energy application stage of fine demagnetization to ensure adjustment accuracy; the multi-switch switching matrix 102 cuts off the circuit interference path during the demagnetization stage after energy disconnection, and the inductive energy absorption module 103 consumes inductive coupling energy to synergistically improve the demagnetizing effect of the magnetically shielded space.

[0069] In one possible implementation of the above embodiments, please refer to Figure 2 , Figure 2 This is an exemplary schematic diagram of a specific architecture of a demagnetizing power supply noise reduction and DC blocking circuit for a magnetically shielded space, according to an embodiment of this disclosure. Figure 2As shown, the inductive energy absorption module 103 (not shown in the figure) includes an LCR array, and the multi-switch switching matrix 102 (not shown in the figure) includes: a first switch (hereinafter referred to as J1), a second switch (hereinafter referred to as J2), a third switch (hereinafter referred to as J3) and a fourth switch (hereinafter referred to as J4).

[0070] The first switch (J1) is connected in series between the DC blocking element 101 and the LCR array, the third switch (J3) and the fourth switch (J4) are connected in series in the connection path between the DC blocking element 101 and the demagnetizing coil, and the second switch (J2) is connected in parallel across the two ends of the LCR array.

[0071] It is understood that the aforementioned switches may include, but are not limited to, on / off components such as relays, semiconductor switches, and mechanical switches.

[0072] Please refer to further information. Figure 3 , Figure 3 This is an exemplary schematic diagram of the specific architecture of a demagnetizing power supply noise reduction and DC blocking circuit for a magnetically shielded space during the energy application stage of fine demagnetization, according to an embodiment of this disclosure. Figure 3 As shown, during the energy application stage of fine demagnetization, the first switch (J1) is open, and the second switch (J2), the third switch (J3) and the fourth switch (J4) are turned on, so that the output terminal of the DC blocking element 101 forms a path with the demagnetizing coil, and the LCR array is bypassed by the second switch (J2).

[0073] Please refer to further information. Figure 4 , Figure 4 This is an exemplary schematic diagram of the specific architecture of a demagnetizing power supply noise reduction and DC blocking circuit for a magnetically shielded space in the post-demagnetizing stage after energy disconnection, according to an embodiment of this disclosure. Figure 4 As shown, in the demagnetization stage after energy disconnection, the first switch (J1) is turned on, and the second switch (J2), the third switch (J3) and the fourth switch (J4) are turned off, so that the output terminal of the DC blocking element 101 forms a path with the LCR array. The demagnetizing coil is physically isolated from the DC blocking element 101 and the demagnetizing power supply, and the coupling interference energy of the demagnetizing power supply is consumed by the LCR array.

[0074] In this embodiment, the LCR array of the inductive energy absorption module 103 and the four switches of the multi-switch switching matrix 102 form a specific topology.

[0075] The first switch (J1) is connected in series between the DC blocking element 101 and the LCR array to control the energy transmission path from the DC blocking element 101 to the LCR array; the second switch (J2) is connected in parallel across the two ends of the LCR array and can short-circuit (bypass) the LCR array through the on state; the third switch (J3) and the fourth switch (J4) are connected in series between the DC blocking element 101 and the demagnetizing coil to jointly control the energy transmission path from the DC blocking element 101 to the demagnetizing coil.

[0076] like Figure 3 As shown, during the energy application stage of fine demagnetization, the first switch (J1) is open, cutting off the connection between the DC blocking element 101 and the LCR array, thus preventing the LCR array from shunting energy; the second switch (J2), the third switch (J3), and the fourth switch (J4) are turned on. The second switch (J2) being turned on bypasses the LCR array, completely eliminating the interference of the LCR array on the energy output; the third switch (J3) and the fourth switch (J4) being turned on form a path between the DC blocking element 101 and the demagnetizing coil, ensuring that the AC demagnetizing signal after the DC component is filtered by the DC blocking element 101 is efficiently transmitted to the demagnetizing coil.

[0077] Here, through the on / off logic of the first switch (J1), the second switch (J2), the third switch (J3) and the fourth switch (J4), in the low-power fine adjustment stage, the DC bias is blocked by the DC blocking element 101, and the bypass LCR array ensures that all energy is applied to the demagnetizing coil, thus meeting the high-precision demagnetization requirements.

[0078] like Figure 4 As shown, during the energy application stage of fine demagnetization, the first switch (J1) is turned on, forming a path between the DC blocking element 101 and the LCR array, providing a path for consuming the coupled interference energy; the second switch (J2), the third switch (J3), and the fourth switch (J4) are turned off. Specifically, the second switch (J2) is turned off to release the bypass to the LCR array, allowing the LCR array to enter the working state; the third switch (J3) and the fourth switch (J4) are turned off to cut off the physical connection between the DC blocking element 101, the demagnetizing power supply, and the demagnetizing coil, achieving electrical isolation.

[0079] Here, the coupling interference energy during standby of the demagnetizing power supply is introduced into the LCR array through the first switch (J1). The LCR array consumes energy to convert the coupling interference energy into heat energy, thus preventing energy from acting on the demagnetizing coil through space or induction, and preventing secondary magnetization of the magnetic shielding layer.

[0080] The demagnetizing power supply noise reduction and DC blocking circuit and device for magnetically shielded spaces disclosed in the above embodiments of this invention achieves the following: During the energy application stage of fine demagnetization, the logic of "J1 off, J2 / J3 / J4 on" utilizes the DC blocking element 101 to block the DC bias while ensuring that all energy is applied to the demagnetizing coil, meeting the core requirement of high-precision demagnetization in the low-power stage. In the post-demagnetization stage after energy disconnection, the logic of "J1 on, J2 / J3 / J4 off" achieves complete isolation and active energy dissipation, preventing secondary magnetization of the magnetic shielding layer. A clear functional division is formed through the specific connection of only four switches, and the switching of various modes such as energy application, interference isolation, and residual energy dissipation can be completed through simple on / off logic, eliminating the need for complex control algorithms. This not only reduces circuit complexity but also improves operational reliability, adapting to the dynamic requirements of the demagnetization process in magnetically shielded spaces.

[0081] In one possible implementation of the above embodiments, please refer to Figure 5 , Figure 5 This is an exemplary schematic diagram of another specific architecture of a demagnetizing power supply noise reduction and DC blocking circuit for a magnetically shielded space, as described in an embodiment of this disclosure. Figure 5 As shown, the inductive energy absorption module 103 (not shown in the figure) includes a first switch, and the multi-switch switching matrix 102 (not shown in the figure) includes a first switch (J1) and a fourth switch (J4).

[0082] The fourth switch (J4) is connected in series in the connection path between the DC blocking element 101 and the demagnetizing coil. One end of the first switch (J1) is connected to the output terminal of the DC blocking element 101, and the other end is grounded. The first switch (J1) is configured with a preset large coil internal resistance and serves as the energy-consuming element of the inductive energy absorption module 103.

[0083] In this embodiment, the multi-switch switching matrix 102 consists of a first switch (J1) and a fourth switch (J4). The fourth switch (J4) is connected in series in the connection path between the DC blocking element 101 and the demagnetizing coil, controlling the energy transmission from the DC blocking element to the demagnetizing coil. One end of the first switch (J1) is connected to the output end of the DC blocking element 101, and the other end is grounded. It is also configured with a preset large coil internal resistance and has the dual functions of a switching switch and an energy-consuming element, serving as the core component of the inductive energy absorption module 103.

[0084] The DC blocking element 101 still performs the function of filtering out DC components. Its output terminal is connected to the demagnetizing coil through the fourth switch (J4) and to the ground terminal through the first switch (J1).

[0085] Please refer to further information. Figure 6 , Figure 6 This is an exemplary schematic diagram of another specific architecture of a demagnetizing power supply noise reduction and DC blocking circuit for a magnetically shielded space in the energy application stage of fine demagnetization, as described in this disclosure embodiment. Figure 6 As shown, during the energy application stage of fine demagnetization, the first switch (J1) is open, the fourth switch (J4) is open, the output terminal of the DC blocking element 101 forms a path with the demagnetizing coil, and the DC blocking element 101 filters out the DC component.

[0086] In this embodiment, the first switch (J1) is open, cutting off the connection between the output terminal of the DC blocking element 101 and ground, thus preventing the high internal resistance of the first switch (J1) from shunting energy or consuming effective demagnetizing energy. The fourth switch (J4) is closed, forming a path between the DC blocking element 101 and the demagnetizing coil, ensuring that the AC demagnetizing signal after the DC component is filtered out by the DC blocking element 101 is efficiently transmitted to the demagnetizing coil, meeting the requirements for low-power fine adjustment.

[0087] Please refer to further information. Figure 7 , Figure 7 This is an exemplary schematic diagram of the specific architecture of another demagnetizing power supply noise reduction DC blocking circuit for a magnetically shielded space in the post-demagnetization stage after energy disconnection, as described in another embodiment of this disclosure. Figure 7 As shown, in the demagnetization stage after energy disconnection, the fourth switch (J4) is open and the first switch (J1) is closed. The demagnetizing coil is physically isolated from the DC blocking element 101 and the demagnetizing power supply. The first switch (J1) consumes the coupling interference energy of the demagnetizing power supply through the preset large coil internal resistance.

[0088] In this embodiment, the fourth switch (J4) is open, cutting off the physical connection between the DC blocking element 101, the demagnetizing power supply, and the demagnetizing coil, thereby achieving electrical isolation and blocking the circuit transmission path. The first switch (J1) is closed, and the output terminal of the DC blocking element is grounded through the first switch (J1). Utilizing the preset large coil internal resistance of the first switch (J1), the coupling interference energy of the demagnetizing power supply during standby is dissipated through resistive heat loss.

[0089] Through the above embodiments of this disclosure, as shown in the example Figure 5-7 Another specific architecture of the demagnetizing power supply noise reduction DC blocking circuit for magnetically shielded spaces, as shown in any one of the above, simplifies the circuit and reduces cost and complexity while ensuring the core function by reducing the number of switches and using the large internal resistance characteristic of the first switch (J1) to replace the independent LCR array. It can still meet the full-stage requirements of the magnetically shielded space demagnetization process, from fine demagnetization to post-demagnetization protection.

[0090] This invention also provides a demagnetizing power supply noise reduction and DC blocking device for magnetically shielded spaces. The demagnetizing power supply noise reduction and DC blocking circuit of the above-described embodiments of this disclosure can be applied to the demagnetizing power supply noise reduction and DC blocking device for magnetically shielded spaces as a hardware unit in the device.

[0091] 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 demagnetizing power supply noise reduction decoupling circuit for magnetically shielding a space, characterized by, The circuit comprises a DC blocking element, a multi-switch switching matrix and an induced energy absorption module, one end of the DC blocking element is connected to a demagnetization power supply, and the other end is connected to an input end of the multi-switch switching matrix; A first output end of the multi-switch switching matrix is connected to a demagnetization coil, and a second output end is connected to the induced energy absorption module; The multi-switch switching matrix is configured to connect the output end of the DC blocking element to the demagnetization coil while disconnecting the induced energy absorption module during the energy application stage of fine demagnetization, and the DC blocking element is used to block the DC component in the output of the demagnetization power supply; During the energy-disconnected post-demagnetization stage, the demagnetization coil is disconnected from the DC blocking element and the demagnetization power supply, and the output end of the DC blocking element is connected to the induced energy absorption module to consume the coupling interference energy generated through the coupling path when the demagnetization power supply is in standby.

2. The circuit of claim 1, wherein, The DC blocking element comprises at least one of a DC blocking capacitor array or an isolation transformer.

3. The circuit of claim 1, wherein, The induced energy absorption module comprises an LCR array or an element with energy consumption function for absorbing and consuming coupling interference energy.

4. The circuit of claim 3, wherein, During the energy application stage of fine demagnetization, the DC blocking element is configured based on the demagnetization frequency to filter out the DC component in the output of the demagnetization power supply through the DC blocking characteristic. During the energy-disconnected post-demagnetization stage, the multi-switch switching matrix disconnects the demagnetization coil from the DC blocking element and the demagnetization power supply, and connects the DC blocking element to the LCR array, and the LCR array consumes the coupling interference energy of the demagnetization power supply.

5. The circuit of claim 2, wherein, The induced energy absorption module comprises an LCR array, and the multi-switch switching matrix comprises a first switch, a second switch, a third switch and a fourth switch. The first switch is connected in series between the DC blocking element and the LCR array, the third switch and the fourth switch are connected in series in the connection path between the DC blocking element and the demagnetization coil, and the second switch is connected in parallel across the LCR array; During the energy application stage of fine demagnetization, the first switch is disconnected, the second switch, the third switch and the fourth switch are connected, the output end of the DC blocking element forms a path with the demagnetization coil, and the LCR array is bypassed by the second switch; During the energy-disconnected post-demagnetization stage, the first switch is connected, the second switch, the third switch and the fourth switch are disconnected, the output end of the DC blocking element forms a path with the LCR array, the demagnetization coil is physically isolated from the DC blocking element and the demagnetization power supply, and the coupling interference energy of the demagnetization power supply is consumed by the LCR array.

6. The circuit of claim 2, wherein, The induced energy absorption module comprises a first switch, and the multi-switch switching matrix comprises the first switch and a fourth switch; The fourth switch is connected in series in the connection path between the DC blocking element and the demagnetization coil, one end of the first switch is connected to the output end of the DC blocking element, and the other end is grounded; wherein the first switch is configured with a preset large coil resistance as an energy consumption element of the induced energy absorption module; In the energy application stage of fine demagnetization, the first switch is off, the fourth switch is on, the DC blocking element output forms a path with the demagnetization coil, and the DC blocking element filters out the DC component; In the energy-off demagnetization post-stage, the fourth switch is off, the first switch is on, the demagnetization coil is physically isolated from the DC blocking element and the demagnetization power supply, and the first switch consumes the coupled interference energy of the demagnetization power supply through the preset large coil internal resistance.

7. A demagnetizing power supply noise reduction direct current blocking device for magnetically shielding a space, characterized in that, The demagnetization power supply noise reduction DC blocking device for a magnetically shielded space comprises the demagnetization power supply noise reduction DC blocking circuit for a magnetically shielded space according to any one of claims 1-6.

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