Method for suppressing high-current magnetic saturation of high-temperature magnetic sensitive element

Abstract

The application discloses a high-temperature-resistant magnetic sensitive element large-current magnetic saturation suppression method, and belongs to the technical field of electromagnetic measurement, which comprises the following steps: acquiring a working temperature parameter of a magnetic sensitive element and a measured current parameter; performing operation by using a nonlinear coupling function to obtain a magnetic circuit control instruction; based on the instruction, adjusting a gradient composite magnetic core to obtain a magnetic permeability distribution state; when it is monitored that a temperature value of an outer material exceeds a temperature threshold value, driving a thermal deformation magnetic circuit switch to deform; using the deformation action to drive a movable magnetic shunt piece to cut into a main magnetic circuit to form a magnetic flux shunt path; using an air gap region of the magnetic flux shunt path to excite an eddy current magnetic field, suppressing the magnetic saturation phenomenon, and outputting a stable magnetic field signal. The application adopts a multi-stage collaborative control strategy combining gradient magnetic core dynamic adjustment, thermal physical shunting and eddy current suppression, can effectively suppress the magnetic saturation phenomenon under high temperature and large current, compensates for measurement drift, and significantly improves the working stability and precision of the magnetic sensitive element.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic measurement, and in particular to a method for suppressing magnetic saturation of a high-temperature-resistant magnetic sensitive element under a large current. BACKGROUND

[0002] Magnetic sensitive elements, such as Hall sensors or magnetoresistance sensors, are key devices for realizing non-contact current measurement in the field of electromagnetic measurement. The basic principle is to infer the current size by sensing the magnetic field generated by the measured current. In application scenarios such as new energy vehicles, industrial frequency conversion, and rail transit, these elements often need to accurately monitor large currents in high-temperature environments, so the stability and reliability of their performance are crucial.

[0003] For the problem of magnetic core magnetic saturation commonly encountered in large current measurement, existing technologies usually adopt various ways to alleviate it. One common method is to use soft magnetic materials with high saturation magnetic induction to make the magnetic core. Another method is to design the structure, such as increasing the effective cross-sectional area of the magnetic core, or introducing a fixed air gap in the main magnetic circuit, to reduce the overall magnetic flux density. In addition, in a closed-loop current sensor, a compensation coil is used to generate a reverse magnetic flux to offset the main magnetic flux, so that the magnetic core works near the zero magnetic flux state.

[0004] However, the above existing technical solutions have inherent defects when dealing with high-temperature and large-current combined conditions. Simply relying on high saturation magnetic density materials, their magnetic properties often deteriorate significantly at high temperatures, leading to a decrease in measurement accuracy. Increasing the size of the magnetic core to suppress saturation will increase the volume, weight, and cost of the sensor, which does not conform to the development trend of lightweight and miniaturization. Setting a fixed air gap in the magnetic circuit can improve the range, but it will sacrifice the sensitivity of the sensor and make it susceptible to external stray magnetic field interference. The circuit structure of the closed-loop compensation scheme is complex, and the power consumption and heat generation are large. When facing transient large current impact, the response speed and driving capacity of the compensation system also face severe challenges SUMMARY

[0005] To solve the above problems, the present application provides a method for suppressing magnetic saturation of a high-temperature-resistant magnetic sensitive element under a large current, which adopts a multi-level collaborative control strategy combining gradient magnetic core dynamic adjustment, thermal-induced physical shunt, and eddy current suppression, which can effectively suppress the magnetic saturation phenomenon under high temperature and large current, compensate for measurement drift, and significantly improve the working stability and precision of the magnetic sensitive element.

[0006] The above objectives can be achieved by the following solutions:

[0007] The method comprises the following steps: obtaining the working temperature parameter and the measured current parameter of the magnetic sensitive element, and generating the working condition parameter; performing operation on the working condition parameter by using a nonlinear coupling function to obtain a magnetic circuit control instruction; adjusting the gradient composite magnetic core composed of the inner layer high saturation magnetic density material layer and the outer layer positive temperature coefficient magnetic resistance material layer based on the magnetic circuit control instruction to obtain a magnetic permeability distribution state; when the real-time temperature value of the outer layer positive temperature coefficient magnetic resistance material layer exceeds the temperature threshold value, driving the thermal deformation magnetic circuit switch to deform; using the deformation action to drive the movable magnetic shunt piece to cut into the main magnetic circuit to form a magnetic flux shunt path; using the air gap area of the magnetic flux shunt path to excite an eddy current magnetic field to suppress the magnetic saturation phenomenon and output a stable magnetic field signal.

[0008] Optionally, the generating working condition parameter comprises: obtaining the real-time working temperature parameter of the magnetic sensitive element by a temperature sensor to obtain temperature data; obtaining the measured current parameter by a current acquisition circuit to obtain current data; and synchronously processing the temperature data and the current data to generate the working condition parameter.

[0009] Optionally, the obtaining magnetic circuit control instruction comprises: performing feature extraction on the working condition parameter to obtain a temperature feature vector and a current feature vector; calculating a target magnetic permeability value by using the temperature feature vector and the current feature vector and a magnetic permeability mapping relationship; and performing signal coding on the target magnetic permeability value to obtain the magnetic circuit control instruction.

[0010] Optionally, the obtaining magnetic permeability distribution state comprises: analyzing the target magnetic permeability value in the magnetic circuit control instruction to obtain an adjustment parameter; adjusting the lattice arrangement direction of the outer layer positive temperature coefficient magnetic resistance material layer to form a temperature-enhanced magnetic resistance channel; and combining the inner layer high saturation magnetic density material layer and the temperature-enhanced magnetic resistance channel to obtain the magnetic permeability distribution state.

[0011] Optionally, the driving thermal deformation magnetic circuit switch to deform comprises: detecting the trigger state of the temperature threshold value to generate a trigger signal; when the trigger signal is valid, applying a temperature load to the bimetallic intelligent ring to generate a directional expansion displacement; converting the directional expansion displacement into a mechanical thrust to drive the thermal deformation magnetic circuit switch to deform.

[0012] Optionally, the using the deformation action to drive the movable magnetic shunt piece to cut into the main magnetic circuit comprises: transmitting the mechanical thrust to the movable magnetic shunt piece by a linkage transmission mechanism; and pushing the movable magnetic shunt piece to cut into the main magnetic circuit along a guide rail to form a magnetic flux shunt path.

[0013] Optionally, the exciting the eddy current magnetic field by the air gap region of the magnetic flux shunt path comprises: identifying a position of the air gap formed by the magnetic flux shunt path, forming an air gap parameter; activating an array of wedge-shaped conductors arranged at the position of the air gap; generating induced eddy currents in the array of wedge-shaped conductors by the measured current, and obtaining a reverse suppression magnetic field.

[0014] Optionally, the suppressing the magnetic saturation phenomenon comprises: obtaining a strength parameter of the reverse suppression magnetic field, generating magnetic field strength data; calculating a superimposed magnetic field distribution of the reverse suppression magnetic field and the main magnetic field by using the magnetic field strength data, reducing the peak value of the magnetic flux density of the magnetic core region, and generating a linearized magnetic field output.

[0015] Optionally, the method further comprises: continuously monitoring the temperature drift amount of the magnetic sensitive element, generating temperature drift data; when the temperature drift data exceeds a tolerance range, adjusting the conduction phase of the array of wedge-shaped conductors, reconstructing the eddy current suppression waveform; compensating for the magnetic measurement drift by using the reconstructed eddy current suppression waveform, and improving the stability of the magnetic field signal output.

[0016] Based on the same inventive concept, the application also provides a high-temperature-resistant magnetic sensitive element large-current magnetic saturation suppression system, which comprises: a working condition monitoring module, configured to obtain working temperature parameters and measured current parameters of a magnetic sensitive element, and generate working condition parameters; a magnetic circuit control module, configured to perform operation by using a nonlinear coupling function according to the working condition parameters, and obtain magnetic circuit control instructions; a gradient magnetic core adjusting module, configured to adjust a gradient composite magnetic core composed of an inner layer of high-saturation magnetic density material and an outer layer of positive temperature coefficient magnetic resistance material based on the magnetic circuit control instructions, and obtain a magnetic permeability distribution state; a temperature triggering module, configured to drive a thermal deformation magnetic circuit switch to deform when it is monitored that a real-time temperature value of the outer layer of positive temperature coefficient magnetic resistance material exceeds a temperature threshold; a magnetic flux shunt module, configured to drive a movable magnetic shunt piece to cut into a main magnetic circuit by using the deformation action to form a magnetic flux shunt path; and an eddy current suppression module, configured to excite an eddy current magnetic field by an air gap region of the magnetic flux shunt path, suppress the magnetic saturation phenomenon, and output a stable magnetic field signal.

[0017] Compared with the prior art, the application has the following advantages:

[0018] By obtaining working condition parameters in real time and dynamically adjusting the magnetic permeability distribution of the gradient composite magnetic core by using a nonlinear coupling function, the application realizes intelligent and forward-looking control of the magnetic circuit characteristics, so that the magnetic saturation suppression strategy can accurately adapt to changing temperature and current loads, thereby significantly improving the measurement linearity and accuracy of the magnetic sensitive element in a dynamic working range.

[0019] The application sets a thermal deformation magnetic circuit switch triggered based on a temperature threshold, which utilizes the physical characteristics of materials to automatically drive the change of the magnetic circuit structure at an extremely high temperature, and forms a reliable magnetic flux shunt path. This passive physical protection mechanism does not depend on complex electronic control, has high reliability, can effectively prevent the permanent damage of the magnetic core due to overload at the critical moment, and guarantees the overall safety of the element and system.

[0020] The application ingeniously utilizes the air gap area in the magnetic flux shunt path, excites an eddy current magnetic field opposite to the direction of the main magnetic field through the array of wedge-shaped conductors, and realizes the active cancellation and peak clipping of the magnetic flux. The method converts the physical effect of eddy current into a controllable suppression means, and the suppression intensity is positively related to the current change rate, which can dynamically and efficiently suppress the current impact causing saturation, and fundamentally relieves the saturation pressure of the magnetic core.

[0021] The application not only suppresses magnetic saturation, but also further utilizes the reconfigurable eddy current suppression waveform to perform closed-loop compensation on temperature drift. This design of integrating the functions of saturation suppression and drift compensation in the same execution mechanism realizes the cooperative processing of the two key factors affecting the measurement stability, and ensures that the magnetic field signal output can maintain high stability and accuracy in a wide temperature range and a large current dynamic range.

[0022] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

[0024] Figure 1 is a flowchart of a large-current magnetic saturation suppression method of a high-temperature-resistant magnetic sensitive element in an embodiment of the present application.

[0025] Figure 2 is a flowchart of a thermal deformation magnetic circuit switch driving mechanism in an embodiment of the present application.

[0026] Figure 3 is a curve graph of the relationship between the magnetic flux distribution ratio and the magnetic resistance ratio in an embodiment of the present application.

[0027] Figure 4 is a three-dimensional graph of the intensity of the eddy current reverse suppression magnetic field in an embodiment of the present application.

[0028] Figure 5 is a high-temperature-resistant magnetic sensitive element large-current magnetic saturation suppression system structure schematic diagram of the embodiment of the application. DETAILED DESCRIPTION

[0029] To make the purposes, technical solutions and advantages of the embodiments of the application clearer, the technical solutions in the embodiments of the application will be clearly and completely explained in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are some but not all of the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the application.

[0030] With reference to Figure 1 An embodiment of the application provides a high-temperature-resistant magnetic sensitive element large-current magnetic saturation suppression method, which adopts a multi-stage collaborative control strategy combining gradient magnetic core dynamic adjustment, thermal physical shunt and eddy current suppression, can effectively suppress the magnetic saturation phenomenon under high temperature and large current, compensate for measurement drift, and significantly improve the working stability and precision of the magnetic sensitive element.

[0031] The specific method of the embodiment comprises the following steps:

[0032] Obtaining a working temperature parameter and a measured current parameter of a magnetic sensitive element, and generating a working condition parameter;

[0033] According to the working condition parameter, performing operation by using a nonlinear coupling function to obtain a magnetic circuit control instruction;

[0034] Based on the magnetic circuit control instruction, adjusting a gradient composite magnetic core composed of an inner layer of high-saturation magnetic density material and an outer layer of positive temperature coefficient magnetic resistance material to obtain a permeability distribution state;

[0035] When it is monitored that a real-time temperature value of the outer layer of positive temperature coefficient magnetic resistance material exceeds a temperature threshold value, driving a thermal deformation magnetic circuit switch to perform a deformation action;

[0036] Using the deformation action to drive a movable magnetic shunt piece to cut into a main magnetic circuit to form a magnetic flux shunt path;

[0037] Using an air gap region of the magnetic flux shunt path to excite an eddy current magnetic field, suppressing the magnetic saturation phenomenon, and outputting a stable magnetic field signal.

[0038] Specifically, the method first acquires temperature and current working condition parameters in real time, and uses a nonlinear coupling function to perform intelligent operation to generate a magnetic circuit control instruction. This instruction is used to actively adjust the gradient composite magnetic core composed of inner high-saturation magnetic density material and outer positive temperature coefficient magnetic resistance material, dynamically optimize the permeability distribution state thereof, which is the first-stage fine electromagnetic adjustment. When the working condition deteriorates and the temperature exceeds the preset threshold, the system starts the second-stage physical intervention, a thermal deformation magnetic circuit switch is driven to deform by heat, the mechanical force generated by the deformation pushes a movable magnetic shunt into the main magnetic circuit to forcibly open a magnetic flux shunt path. Finally, the method ingeniously uses the air gap area on the shunt path to generate an induced eddy current by the change of the magnetic flux flowing through the air gap area, and generates an eddy current magnetic field opposite to the direction of the main magnetic field, so as to actively offset part of the magnetic flux, thereby realizing the final suppression of the magnetic saturation phenomenon. The method actively generates a reverse eddy current magnetic field to weaken the magnetic flux peak, fundamentally alleviates the saturation pressure of the magnetic core, ensures that the magnetic sensitive element can continuously output stable and linear magnetic field signals, and greatly improves the measurement accuracy, stability and working reliability of the element in harsh application environments.

[0039] Optionally, the generating working condition parameters comprises:

[0040] acquiring a real-time working temperature parameter of the magnetic sensitive element by a temperature sensor to obtain temperature data;

[0041] acquiring a measured current parameter by a current acquisition circuit to obtain current data;

[0042] synchronously processing the temperature data and the current data to generate working condition parameters.

[0043] Specifically, first, a high-precision temperature sensor, such as a platinum resistance or a thermocouple, is arranged near the core area of the magnetic sensor or the key heat dissipation path thereof to capture the internal or surface temperature of the magnetic sensor in real time. The sensor converts the sensed heat change into a continuous electrical signal, i.e., a real-time operating temperature parameter. Then, the electrical signal is sampled and quantized by an analog-to-digital conversion circuit to form a discretized time series, i.e., temperature data. At the same time, a current acquisition circuit, which can be a high-precision shunt resistor or an independent Hall current sensor, is connected in series in the main circuit through which the measured current flows. The circuit converts the measured current parameter, i.e., the current flowing through the main circuit, into a voltage or digital signal proportional to it. This signal is also amplified, filtered, and analog-to-digital converted to generate current data corresponding to the measured current value. The key step is to synchronously process the above two sets of data. The system uses a unified master clock signal to trigger the sampling operation of the temperature data and the current data simultaneously, ensuring that the temperature value and the current value obtained at each sampling time point are strictly corresponding, and eliminating the problem of data asynchronization caused by acquisition delay. After synchronous sampling, the system combines the temperature data and the current data at the same time into a data pair or a data vector, which is a data structure containing time and dual physical quantity information, i.e., defined as a working condition parameter. This working condition parameter fully reflects the electric-thermal composite load state of the magnetic sensor at a specific time point, providing accurate and time-lag-free input for subsequent nonlinear coupling function operation. This high-fidelity working condition representation is the premise for the realization of fast response and accurate regulation of the entire magnetic saturation suppression system, significantly improving the effectiveness and predictability of the control strategy, thereby ensuring the measurement accuracy and working stability of the magnetic sensor in a complex environment of high temperature and large current.

[0044] Optionally, the obtaining of the magnetic circuit control instruction comprises:

[0045] characteristic extraction is performed on the working condition parameter to obtain a temperature feature vector and a current feature vector;

[0046] a target magnetic permeability value is calculated using a magnetic permeability mapping relationship of the temperature feature vector and the current feature vector;

[0047] signal encoding is performed on the target magnetic permeability value to obtain the magnetic circuit control instruction.

[0048] Specifically, first, feature extraction is performed on the operating parameters. Feature extraction refers to extracting deep-level information that can better represent the dynamic changes of the system from the original temperature data and current data streams through algorithm analysis, rather than just using instantaneous values. For example, not only the current value of the temperature data is obtained, but also its rate of change and short-term integral value are calculated to form a temperature feature vector that contains the temperature amplitude, change trend, and heat accumulation effect. Similarly, the current data is also processed in a similar manner to extract information such as current amplitude, rate of change, and frequency component to form a current feature vector. Next, the two feature vectors are used to calculate the target permeability value. This step is realized through a pre-established permeability mapping relationship, which is essentially a nonlinear function that describes the magnetic permeability that the gradient composite magnetic core needs to exhibit under the combined action of different temperatures and currents to maintain the linear operating region of the magnetic sensitive element. Its calculation process can be represented by the following formula:

[0049] μ target =f(V T ,V I ),

[0050] where μ target is the calculated target permeability value, representing the optimal magnetic permeability required to suppress magnetic saturation; f represents the magnetic permeability mapping relationship, which is a nonlinear coupling function; V T is the temperature feature vector obtained through feature extraction; V I is the current feature vector obtained through feature extraction. The nonlinear coupling function f is modeled through machine learning algorithms, such as shallow neural networks or support vector regression models. Under a wide range of temperature and current operating conditions, a large number of operating parameters (V T and V I ) and their corresponding optimal target permeability values μ target are obtained through experimental benches or high-precision finite element simulations. The "optimal target permeability value" can be determined by back-calculation based on the output linearity index or internal magnetic field distribution uniformity under the unsaturated state of the magnetic core. These data constitute the training data set. The obtained training data set is input into the selected machine learning model for training. For example, if a neural network is used, the input layer receives the temperature feature vector V T and the current feature vector V I , passes through several hidden layers, and finally the output layer obtains the target permeability value μ target . Through the backpropagation algorithm and the optimizer, the network weights are adjusted to make the predicted output of the model consistent with the expected μ targetThe error between the values is minimized. The trained model can be embedded in the microcontroller or FPGA of the magnetic circuit control module in a lightweight form to realize real-time operation. Finally, the target permeability value obtained by calculation is signal coded. The target permeability value is a numerical quantity, and in order to drive the subsequent gradient magnetic core adjustment module, it needs to be converted into a physically executable electrical signal. The signal coding process is to convert this numerical value into, for example, the duty cycle of a pulse width modulation signal, a specific voltage or current amplitude, or a data frame of a digital communication protocol. This encoded electrical signal carrying the target permeability adjustment information is the final generated magnetic circuit control instruction. This process realizes an intelligent closed loop from state perception to control decision, greatly improves the pertinence and effectiveness of the magnetic saturation suppression strategy, and ensures that the magnetic sensitive element can still maintain its measurement linearity and stability under the dynamic and harsh working conditions.

[0051] Optionally, the obtaining the magnetic permeability distribution state comprises:

[0052] Analyzing the target permeability value in the magnetic circuit control instruction to obtain an adjustment parameter;

[0053] Adjusting the lattice arrangement direction of the outer layer of positive temperature coefficient magnetic resistance material layer to form a temperature enhancement type magnetic resistance channel;

[0054] Combining the inner layer of high saturation magnetic density material layer and the temperature enhancement type magnetic resistance channel to obtain the magnetic permeability distribution state.

[0055] Specifically, first, the gradient magnetic core adjustment module analyzes the received magnetic circuit control instruction, and decodes the core control information, i.e. the target magnetic permeability value, from it. This numerical value is then converted into a specific set of executable adjustment parameters, such as specific values of the amplitude, frequency or phase of the driving voltage. Next, the system applies this set of adjustment parameters to the outer layer of positive temperature coefficient of magnetic resistance material of the gradient composite magnetic core. This material layer has special magneto-electric or magneto-elastic properties, and the preferred arrangement direction of the internal magnetic domains, i.e. the macroscopic crystal lattice arrangement direction, is sensitive to external physical fields. The material layer can be selected from composite materials or single-phase multiferroic materials with significant magneto-electric coupling effects. For example, a multiferroic material based on the magnetostrictive-piezoelectric composite effect can be selected, such as a structure formed by stacking or compounding a ferromagnetic phase and a piezoelectric phase. Another option is certain perovskite manganese oxides, which generally exhibit CMR (colossal magnetoresistance), but can exhibit positive magneto-resistance effects under certain temperature ranges and doping, and whose magnetic domain structure is also highly sensitive to electric and stress fields, and the magnetic permeability can be regulated by stress field-induced lattice distortion. By applying a control field corresponding to the adjustment parameters, such as an electric field or a stress field, the internal microstructure of the material layer can be induced to adjust the orientation, causing the magnetic domains to rearrange along a specific direction. The method of applying an electric field is usually by arranging micro-electrodes on both sides or specific regions of the outer layer of material, and outputting high-precision, adjustable-amplitude and frequency control voltage from the gradient magnetic core adjustment module. If a stress field is used for adjustment, a micro-piezoelectric actuator can be integrated to directly apply mechanical stress to the material layer, or the piezoelectric phase of a magneto-electric coupling material can be used to generate an electric field-induced strain to indirectly induce the magnetostrictive phase to deform, thereby changing the crystal lattice arrangement. This rearrangement changes the material's resistance to the magnetic flux in the main magnetic circuit. When it is necessary to increase the magnetic resistance, the control field will guide the crystal lattice arrangement direction to tend to the "hard magnetization axis" with lower magnetic permeability, thereby forming a region with stronger resistance to the magnetic flux in the outer layer of the magnetic core, which is the temperature-enhanced magnetic resistance channel. Here, "enhanced" means that the magnetic resistance is not only affected by temperature, but is also actively and significantly strengthened by the control system. Finally, by combining the inner layer of high-saturation magnetic density material with the dynamically constructed temperature-enhanced magnetic resistance channel, which maintains high permeability, the system obtains a specific magnetic permeability distribution state. The inner layer of high-saturation magnetic density material is used to efficiently conduct the main magnetic flux and ensure that the core part is not easily saturated under high current. Such materials generally require high saturation magnetic induction, high initial magnetic permeability, and low coercivity. Typical materials include: iron-based nanocrystalline alloy, cobalt-based amorphous alloy, permalloy, high-nickel permalloy, etc. In this state, the central region of the gradient composite magnetic core maintains low magnetic resistance to efficiently guide the main magnetic flux, while the peripheral region exhibits controlled high magnetic resistance, forming a structure with a gradient change in magnetic permeability from the inside to the outside. This magnetic permeability profile is not fixed and is dynamically reconstructed in real time according to the magnetic circuit control instruction.This ability to precisely shape and adjust the permeability distribution in real time greatly broadens the linear operating range of the magnetic sensor, fundamentally enhancing its anti-magnetic saturation performance and measurement stability under high temperature and large current.

[0056] Optionally, the deforming action of the thermally induced deformed magnetic circuit switch includes:

[0057] Detecting the triggering state of the temperature threshold to generate a trigger signal;

[0058] When the trigger signal is valid, a temperature load is applied to the bimetallic smart ring to generate a directional expansion displacement;

[0059] The directional expansion displacement is converted into a mechanical thrust to drive the thermally induced deformed magnetic circuit switch to perform a deforming action.

[0060] Specifically, first, the working condition monitoring module in the system continuously detects the real-time temperature value of the outer positive temperature coefficient magnetic resistance material layer and compares it with a pre-set safety temperature threshold. The setting of this temperature threshold is based on the heat resistance limit and magnetic performance degradation point of the material. When the monitored real-time temperature value exceeds this temperature threshold, a comparator or logic judgment circuit will determine the triggering state and generate a valid trigger signal immediately. This trigger signal is essentially a state confirmation, indicating that the magnetic sensor is in an extreme thermal overload working condition. In this state, without external active power supply, the system uses the heat itself as the energy source. The bimetallic smart ring arranged in the heat sensitive area is composed of two layers of metal materials with significantly different thermal expansion coefficients, directly bearing the temperature load. Since the temperature has exceeded the threshold, there is a significant expansion difference between the two layers of bimetallic material, causing the ring structure to bend or twist in a preset direction, which is the directional expansion displacement. The size of this displacement is directly proportional to the temperature exceeding the threshold. Finally, through a clever mechanical structure, the directional expansion displacement generated by the bimetallic smart ring is converted into a direct and one-way mechanical thrust. For example, the deformed end of the ring directly pushes a push rod or lever connected to the thermally induced deformed magnetic circuit switch. The mechanical thrust overcomes the static friction and restoring force of the switch mechanism, driving the thermally induced deformed magnetic circuit switch to perform a deforming action from its normal position to the working state. The triggering condition can be expressed as: when T real > T threshold , the driving action occurs, where T real is the real-time temperature value of the outer positive temperature coefficient magnetic resistance material layer obtained by the temperature sensor, and T threshold is the pre-set temperature threshold. For example, Figure 2As shown, the thermal deformation magnetic circuit switch driving mechanism flow chart shows the complete driving process of the thermal deformation magnetic circuit switch. The method establishes a passive thermal protection path based on physical principles independent of the main control system. It directly drives the mechanical switch using the inherent thermal physical properties of the material, without complex electronic judgment and driving circuit, thereby greatly improving the reliability and response immediacy of the system under extreme high temperature overload conditions.

[0061] Optionally, the driving of the movable magnetic shunt piece into the main magnetic circuit by the deformation action comprises:

[0062] transmitting the mechanical thrust to the movable magnetic shunt piece through a linkage transmission mechanism;

[0063] pushing the movable magnetic shunt piece along the guide rail into the main magnetic circuit to form a magnetic flux shunt path.

[0064] Specifically, the process begins with the mechanical thrust generated by the thermal deformation magnetic circuit switch. This thrust serves as a power source and is transmitted through a linkage transmission mechanism. The linkage transmission mechanism, such as a set of precisely designed levers or gear and rack systems, functions to convert the small but reliable displacement generated by the bimetallic smart ring into linear travel and force sufficient to drive the movable magnetic shunt piece. The output end of the mechanism is connected to the movable magnetic shunt piece. This shunt piece is a specially shaped element made of high-permeability materials such as permalloy or soft iron. In the normal state, it is positioned outside the main magnetic circuit and has no effect on the magnetic circuit. When the mechanical thrust is transmitted by the linkage transmission mechanism, it will push the movable magnetic shunt piece to move precisely along the pre-set guide rail with low-friction coating. The guide rail ensures that the shunt piece can smoothly and non-stuckly cut into the reserved gap of the main magnetic circuit. The main magnetic circuit refers to the main closed path where the magnetic flux generated by the measured current is concentrated. When the movable magnetic shunt piece is completely pushed into place, it forms a new low-resistance path parallel to the original magnetic circuit in the main magnetic circuit, which is the magnetic flux shunt path. The shunt principle of magnetic flux follows the Ohm's law of magnetic circuit, and its distribution relationship can be expressed as:

[0065] Φ shunt = Φ total *(R main / (R main +R shunt )),

[0066] where Φ shunt is the magnetic flux flowing through the magnetic flux shunt path; Φ total is the total magnetic flux generated by the measured current, which is determined by the current data of the current collection circuit; R main is the original magnetic resistance of the main magnetic circuit; R shuntThe magnetic reluctance is Rs, representing the shunt path formed by the movable magnetic shunt piece. Because the shunt piece is made of a high-permeability material, its magnetic reluctance is Rs. shunt The magnetic reluctance is much smaller than that of the main magnetic circuit shunted by it, thus achieving significant flux shunting. For example... Figure 3 As shown, the curves illustrating the relationship between the flux distribution ratio and the reluctance ratio demonstrate the distribution effect of the flux shunting path. The horizontal axis represents the reluctance ratio (R). shunt / R main The vertical axis represents the magnetic flux distribution ratio (Φ). shunt / Φ total As the reluctance ratio decreases, the flux distribution ratio increases rapidly. The core technical advantage of this method is that it provides a reliable means of physically reconstructing the magnetic circuit topology under extreme thermal overload conditions. Through purely mechanical linkage, the thermal overload signal is transformed into a change in the macroscopic structure of the magnetic circuit, forming an efficient flux diversion path. This path can divert a large amount of flux from the main magnetic circuit, reducing the flux density in key areas of the core and allowing the saturated or nearly saturated core to return to the linear operating region. More importantly, this mechanical action creates the necessary physical conditions for precise suppression using the air gap effect. It is a crucial physical link in the multi-stage suppression strategy, ensuring the system's functional continuity under extreme conditions.

[0067] Optionally, the process of generating an eddy current magnetic field using the air gap region of the magnetic flux splitting path includes:

[0068] Identify the air gap location formed by the magnetic flux shunting path and generate air gap parameters;

[0069] Activate the wedge-shaped conductor array located at the air gap position;

[0070] By utilizing the measured current to generate eddy currents in the wedge-shaped conductor array, a reverse suppression magnetic field is obtained.

[0071] Specifically, first, when the magnetic flux shunt path is formed, the system controller recognizes the preset air gap position formed between the movable magnetic shunt piece and the main magnetic circuit structure. The key information of the air gap, such as the geometric size, shape and relative position, i.e. the air gap parameter, is determined during system design and stored in the controller. Next, the controller confirms that the air gap area enters the working state, thereby activating the wedge-shaped conductor array preset at the air gap position. The array is composed of a group of wedge-shaped blocks made of materials with excellent electrical conductivity but no ferromagnetic properties, such as copper or aluminum. "Activation" here is a physical process, which means that the changing magnetic flux starts to pass through the conductor array. Due to the measured current, especially when it is alternating current or direct current containing high-frequency pulsating components, the magnetic flux generated in the magnetic flux shunt path is time-varying. According to the law of electromagnetic induction, this changing magnetic flux generates an induced electromotive force in the closed loop of the wedge-shaped conductor array and drives the formation of induced eddy current. According to Lenz's law, the magnetic field generated by the induced eddy current always resists the change of the magnetic flux that causes the induced eddy current. Therefore, the direction of the magnetic field excited by the induced eddy current is opposite to that of the main magnetic flux, forming an effective reverse suppression magnetic field. The design of the wedge aims to optimize its gradually changing cross section to efficiently guide and concentrate the path of the induced eddy current and its current density, thereby forming a reverse suppression magnetic field with more accurate spatial distribution and adjustable strength in the air gap area. The strength of the reverse suppression magnetic field is directly related to the rate of change of the measured current, which can be expressed as:

[0072] B sup = -k*(dI meas / dt),

[0073] In this formula, B sup represents the magnetic induction intensity of the reverse suppression magnetic field; I meas is the measured current parameter obtained by the current acquisition circuit; t represents time; k is a comprehensive proportionality coefficient, whose value is determined by the air gap parameter and the material properties and geometric structure of the wedge-shaped conductor array. For example, Figure 4As shown, the reverse suppression magnetic field strength presents a wavy spatial distribution, and when the current rate of change is maximum (such as the peak time of alternating current), the generated reverse suppression magnetic field strength also reaches the maximum value, thereby achieving effective cancellation of the main magnetic field. Specifically, the angle and size of the wedge-shaped arrangement can be fine-tuned through electromagnetic field simulation (such as finite element analysis) to ensure that under different frequencies and amplitudes of magnetic flux changes, the generated eddy current can maximize the cancellation of the main magnetic flux peak, while minimizing unnecessary loss. This method cleverly converts the eddy current effect that may cause problems into a favorable factor for suppressing magnetic saturation. Since the strength of the reverse suppression magnetic field is proportional to the rate of change of the current, it can produce the strongest suppression effect on the current spikes or rapid changes that cause magnetic saturation, achieving a dynamic and rapid response negative feedback control, greatly enhancing the effect of magnetic saturation suppression and ensuring that the magnetic circuit can still maintain a non-saturated state under severe current fluctuations.

[0074] Optionally, the suppression of the magnetic saturation phenomenon comprises:

[0075] Obtaining the strength parameter of the reverse suppression magnetic field to generate magnetic field strength data;

[0076] Using the magnetic field strength data to calculate the superimposed magnetic field distribution of the reverse suppression magnetic field and the main magnetic field, reducing the peak value of the magnetic flux density in the core region, and generating a linearized magnetic field output.

[0077] Specifically, first, the strength parameter of the reverse suppression magnetic field is obtained. Since this magnetic field is dynamically generated, its strength parameter is not directly measured, but calculated through a model. The system uses the real-time measured current parameters and their rate of change to calculate the instantaneous strength and direction of the reverse suppression magnetic field. This series of time-varying calculation results constitute the magnetic field strength data. Subsequently, the system uses this magnetic field strength data and the magnetic field data of the main magnetic circuit to perform vector superposition operation to calculate the final superimposed magnetic field distribution acting on the core region. The main magnetic field is directly generated by the measured current, and its strength is proportional to the size of the measured current. The reverse suppression magnetic field is generated by induced eddy current, and its direction is opposite to that of the main magnetic field. Therefore, the final magnetic flux density in the core region is the vector sum of the two, and its size is the difference between the two. This process can be idealized as follows:

[0078] B res (t)=B main (t)+B sup (t),

[0079] Where B res (t) represents the final combined magnetic induction strength of the core region at time t; B main (t) represents the magnetic induction strength generated by the measured current I meas(t) the magnetic induction of the generated main magnetic field, which is calculated from the sensor model and the current data; B sup (t) then represents the magnetic induction of the counteracting suppression magnetic field generated by the induced eddy currents, which is calculated from the rate of change of the measured current dI meas / dt as magnetic field strength data. Since B main (t) and B sup (t) are in opposite directions, the vector addition is essentially a reduction in amplitude, effectively reducing the peak magnetic flux density in the core region. By controlling the resulting magnetic induction B res (t) to always be below the saturation magnetic induction of the core material, it is ensured that the core always operates in its linear region of substantially constant permeability. Ultimately, the magneto-sensitive element outputs a stable magnetic field signal proportional to the measured current, which is distortion-free, based on the linearized magnetic field sensing. By ensuring that the core does not enter the saturation region, this method fundamentally solves the problem of nonlinear distortion of the measurement signal due to magnetic saturation, significantly improving the measurement accuracy and linearity of the magneto-sensitive element over a large current dynamic range, thereby outputting a high-quality, high-fidelity stable magnetic field signal.

[0080] Optionally, the method further comprises:

[0081] continuously monitoring the temperature drift of the magneto-sensitive element to generate temperature drift data;

[0082] when the temperature drift data exceeds the tolerance range, adjusting the conduction phase of the array of wedge-shaped conductors to reconstruct the eddy current suppression waveform;

[0083] compensate for magnetic measurement drift using the reconstructed eddy current suppression waveform to improve the stability of the magnetic field signal output.

[0084] Specifically, the method first continuously calibrates the magnetic sensitive element online through the working condition monitoring module. The system compares the actual output signal of the magnetic sensitive element with a theoretical output value calculated based on the measured current parameter and an ideal non-drift model in real time. The deviation between the two is identified as the magnetic measurement drift caused by temperature change. After quantifying the deviation, the system generates continuous temperature drift data. When the system detects that the cumulative or instantaneous value of the temperature drift data exceeds the pre-set tolerance range, it determines that the current temperature drift has affected the measurement accuracy and needs to be actively intervened. At this time, the control system sends instructions to an additional control circuit, which is used to finely control the wedge-shaped conductive body array arranged in the air gap region. The wedge-shaped conductive body array here is not a simple overall conductor, but is composed of multiple independent and individually controllable conductive segments connected by a high-speed electronic switch array (such as MOSFET). According to the real-time acquired temperature drift data, the control system dynamically calculates the required compensation magnetic field quantity, and actively changes the time, path, intensity distribution and spatial interaction of the induced eddy current in the array by precisely adjusting the opening and closing timing of these electronic switches (i.e. adjusting the conduction phase of each conductive segment in the wedge-shaped conductive body array). The active regulation mechanism based on time-space selective control reshapes the original single form of induced eddy current field into a complex waveform with specific time-domain and spatial-domain form, which is the reconstructed eddy current suppression waveform. The reconstructed waveform does not generate an independent DC compensation magnetic field, but cleverly uses the induced eddy current excited by the alternating magnetic flux of the measured main current itself, and precisely controls the formation and dissipation characteristics of these eddy currents to superimpose a controlled dynamic magnetic field component on the main magnetic field. Although eddy current is essentially generated by magnetic flux change, through fine regulation of specific segment eddy current, the overall average magnetic field perceived by the magnetic sensitive element or the magnetic field in a specific working period can be locally adjusted or an effective bias can be introduced, thereby offsetting the influence of the quasi-static temperature drift on the measurement signal. Its compensation effect can be represented by the following conceptual model:

[0085] B'(t) = B(t) + B(ΔV(t)) sup (t) = B sup (t) + B comp (ΔV drift ),

[0086] In this expression, B'(t) is the total magnetic field generated by the reconstructed eddy current suppression waveform; B(t) is the original reverse suppression magnetic field component for suppressing magnetic saturation; B(ΔV(t)) is the newly added magnetic field component specifically for compensation, whose size and direction are determined by a function f, whose input is the real-time acquired temperature drift data ΔV(t). sup sup comp drift drift ​​​​The target is to generate a magnetic field that just offsets the drift effect. Through the above method, the system endows the eddy current field originally used to suppress saturation with a second function, i.e. high-precision drift compensation. The core technical effect of this method is that it promotes a macroscopic physical effect, i.e. eddy current effect, to a microscopic and precisely programmable level. Instead of passively accepting the natural form of eddy current, the system actively and intelligently shapes it into the desired form to simultaneously solve the two key problems affecting the performance of magnetic sensitive elements, i.e. magnetic saturation and temperature drift.

[0087] Based on the same inventive concept, the application also provides a high-temperature-resistant magnetic sensitive element large-current magnetic saturation suppression system, as shown in Figure 5 The application also provides a high-temperature-resistant magnetic sensitive element large-current magnetic saturation suppression system, which comprises:

[0088] A working condition monitoring module is configured to acquire a working temperature parameter and a measured current parameter of the magnetic sensitive element, and generate a working condition parameter;

[0089] A magnetic circuit control module is configured to perform operation on the working condition parameter by using a nonlinear coupling function to obtain a magnetic circuit control instruction;

[0090] A gradient magnetic core adjusting module is configured to adjust a gradient composite magnetic core composed of an inner layer of high-saturation magnetic density material and an outer layer of positive temperature coefficient magnetic resistance material based on the magnetic circuit control instruction to obtain a magnetic permeability distribution state;

[0091] A temperature triggering module is configured to drive a thermal deformation magnetic circuit switch to perform a deformation action when it is monitored that a real-time temperature value of the outer layer of positive temperature coefficient magnetic resistance material exceeds a temperature threshold value;

[0092] A magnetic flux shunting module is configured to drive a movable magnetic shunt piece to cut into a main magnetic circuit by using the deformation action to form a magnetic flux shunting path;

[0093] An eddy current suppression module is configured to excite an eddy current magnetic field by using an air gap region of the magnetic flux shunting path to suppress the magnetic saturation phenomenon and output a stable magnetic field signal.

[0094] In order to verify the feasibility of the application in implementation, the application is applied to a battery management system (BMS) of a certain high-performance electric vehicle to perform high-precision and wide-range real-time monitoring on the charge and discharge current of the power battery pack. The electric vehicle will generate a large current of several hundred amperes under working conditions such as sudden acceleration, energy recovery and direct current fast charging, and the heat generated by the battery pack during operation will cause the BMS and its surrounding elements to be in a high-temperature environment, which puts forward very high requirements on the precision and anti-saturation capability of the current sensor.

[0095] In this embodiment, the magnetic sensitive element is a current sensor based on the Hall effect, and the core thereof is a U-shaped or ring-shaped magnetic core. The magnetic core is composed of an inner layer of high-saturation magnetic density nanocrystalline alloy (for example, Fe-based nanocrystalline alloy) and an outer layer of positive temperature coefficient magnetic resistance material (for example, Mn-Zn ferrite). The positive temperature coefficient magnetoresistance material (such as the FN-3 material) and the outer layer are composed of a positive temperature coefficient magnetoresistance material (such as a manganese-zinc ferrite doped with Ni) by a sintering process, and a Hall sensitive element is installed at the air gap of the magnetic core. The system obtains the real-time working temperature of the element through a high-precision temperature sensor, and obtains the main loop current of the battery pack through a current acquisition circuit. The temperature sensor selects a platinum resistance (Pt100), and data sampling is performed through a connected ADC circuit; the current acquisition circuit uses a high-bandwidth shunt resistor and a precision instrument amplifier to convert the large current signal into a voltage signal for digitization through an ADC, ensuring the synchronization of temperature and current data. Through processing of the two synchronously collected data, a working condition parameter reflecting the electrothermal composite load is formed. The working condition parameter is input to the magnetic circuit control module, and the optimal target permeability is calculated through a nonlinear coupling function, and a magnetic circuit control instruction is generated.

[0096] In order to verify the effectiveness of the present application, detailed working condition simulation tests were carried out on a simulation bench, and various scene data from normal driving to extreme working conditions were recorded.

[0097] In the normal driving and mild acceleration working condition, the measured current fluctuates between 50A and 300A, and the element working temperature is between 40℃ and 80℃. At this time, the system mainly relies on the first stage adjustment mechanism. For example, when the vehicle accelerates rapidly, the current rises from 100A to 300A in 2 seconds, and the element temperature rises to 75℃, the magnetic circuit control module calculates the magnetic circuit control instruction in real time according to the working condition parameter, the instruction is in the form of pulse width modulation (PWM) signal, which drives the micro piezoelectric actuator (such as PZT ceramic sheet) arranged on the outer layer positive temperature coefficient magnetoresistance material, and adjusts the lattice arrangement direction of the material through the piezoelectric effect, dynamically adjusts the permeability, so that the magnetic core always works in the linear region, ensuring that the linearity of the measurement signal is better than 99.5%.

[0098] In the extreme working condition simulation test, the direct current fast charging scene in the summer high temperature environment is simulated. The environmental temperature is 40℃, and the charging current is continuously and stably at 450A, which causes the temperature of the magnetic sensitive element to rapidly rise and exceed the preset temperature threshold of 120℃ in 5 minutes. At this time, the system starts the second stage physical intervention mechanism. The temperature trigger module detects the over-temperature state and drives the directional expansion displacement of the bimetallic intelligent ring, which is composed of Invar alloy and stainless steel. The thermal expansion displacement is converted into linear thrust through a precise connecting rod mechanism. The thrust pushes the movable magnetic shunt piece (made of high permeability permalloy) to accurately cut into the main magnetic circuit along the preset low-friction guide rail, forming a magnetic flux shunt path. This process is completely driven by physical effects, and the reconstruction of the magnetic circuit structure is completed in 0.5 seconds.

[0099] After the magnetic circuit is reconstructed, the instantaneous pulse current in the simulation charging protocol is simulated, and the current is instantaneously impacted from 450 A to 600 A within 100 milliseconds. At this time, the varying strong magnetic flux flows through the air gap area on the magnetic flux shunt path, activating the wedge-shaped conductive body array arranged at the position, which is made of high-purity oxygen-free copper and arranged in a narrow-in and wide-out wedge-shaped structure along the circumference of the air gap. The special geometric design enables the induced eddy current to more effectively generate a reverse magnetic field, exciting an induced eddy current magnetic field opposite to the direction of the main magnetic field. The reverse suppression magnetic field successfully reduces the peak value of the magnetic flux density of the main magnetic circuit, so that the magnetic core does not reach the saturation point even under the current impact of 600 A, and the output magnetic field signal remains stable.

[0100] In the long-term high-temperature operation test, the system continuously works at 90 DEG C and 200 A for 30 minutes. The working condition monitoring module detects that the measurement signal drifts by 0.8% due to the overall temperature rise, which exceeds the tolerance range of 0.5%. The system immediately starts the temperature drift compensation function, adjusts the multiple independent conductive units (at least 8 sections, each section is controlled to be turned on by a high-speed MOSFET) in the wedge-shaped conductive body array, dynamically changes the conduction phase and duty cycle of each conductive section according to the real-time drift data by the main control MCU, reconstructs the eddy current suppression waveform, and generates a weak but accurate compensation magnetic field. The compensation magnetic field offsets the error caused by temperature drift, and in the subsequent stage of the test, the measurement drift is stably controlled within 0.3%, verifying the effectiveness of the closed-loop compensation.

[0101] Through data comparison, compared with the traditional Hall current sensor without using the application, the magnetic sensitive element of the application has significant advantages in performance. The output signal of the traditional sensor starts to appear obvious nonlinear distortion when the current exceeds 400 A or the temperature is higher than 100 DEG C, and is completely saturated at 500 A. While the magnetic sensitive element of the application performs well in linear range, high-temperature stability and impact resistance.

[0102] Table 1 Gradient magnetic core adjustment performance data table under different working conditions

[0103]

[0104] Table 2 Magnetic saturation suppression response data table under extreme overload

[0105]

[0106]

[0107] Table 3 Long-term temperature drift compensation effect data table

[0108] Test duration (min) Ambient temperature (°C) Current under test (A) Error before drift compensation Error after drift compensation 0 90 200 0.1％ 0.1％ 15 90 200 0.6％ 0.3％ 30 90 200 0.8％ 0.2％

[0109] The above Tables 1-3 record the actual test data of the application in the application scenario of electric vehicle BMS, which details the multi-stage regulation capability, extreme response performance and high-precision compensation effect of the system under different working conditions.

[0110] As can be seen from Table 1 data, under the conventional dynamic working condition, the gradient magnetic core regulation mechanism can effectively maintain the high linearity of the system. When the current increases from 100A to 300A, the application can still maintain 99.6% linearity, while the control group has decreased to 98.1%, proving the accuracy and effectiveness of the first-stage regulation.

[0111] The data in Table 2 clearly shows the protection capability of the application under extreme overload. When the temperature exceeds the threshold of 120℃, the system successfully starts the physical shunt mechanism and uses the eddy current suppression technology to avoid magnetic saturation under the current impact of up to 600A, while the traditional sensor has completely failed under this working condition. This shows that the multi-stage suppression strategy of the application provides reliable protection for the survival and work of the element under extreme conditions.

[0112] Table 3 verifies the advantage of the system in high-precision measurement. In the high-temperature operation for 30 minutes, the system can actively monitor and compensate the temperature drift, and correct the measurement error from 0.8% to within 0.3%, which is crucial for BMS that needs to accurately calculate SOC (remaining power). These data fully prove the comprehensive performance advantages of the application in high-temperature resistance, large-current magnetic saturation resistance and high-precision measurement.

[0113] It should be noted that the electrical connection between the above-mentioned units does not necessarily represent the direct connection of the line, and the indirect connection mode can also be applied to the embodiments of the application as long as the purpose of the application is achieved. The above-described is only an exemplary embodiment of the application, and cannot limit the scope of the application.

[0114] That is, any equivalent changes and modifications made in accordance with the teachings of the application are still within the scope of the application. Other embodiments of the application will be readily apparent to those skilled in the art upon considering the specification and practice of the true principles disclosed herein. The present application is intended to cover any variations, uses or adaptive changes to the application following the general principles of the application and including common knowledge or conventional technical means in the art not disclosed by the application.

Claims

1. A method for suppressing high-current magnetic saturation in high-temperature resistant magnetic sensitive elements, characterized in that, The method includes: Obtain the operating temperature parameters and measured current parameters of the magnetic sensing element, and generate operating condition parameters; Based on the operating parameters, a magnetic circuit control command is obtained by performing calculations using a nonlinear coupling function. Based on the magnetic circuit control command, the gradient composite magnetic core composed of the inner high saturation magnetic density material layer and the outer positive temperature coefficient magnetoresistive material layer is adjusted to obtain the magnetic permeability distribution state. When the real-time temperature value of the outer positive temperature coefficient magnetoresistive material layer exceeds the temperature threshold, the thermally deformable magnetic circuit switch is driven to deform. The deformation action is used to drive the movable magnetic shunt piece to cut into the main magnetic circuit, forming a magnetic flux shunt path; By utilizing the air gap region of the magnetic flux splitting path, an eddy current magnetic field is excited, which suppresses magnetic saturation and outputs a stable magnetic field signal.

2. The method for suppressing high-current magnetic saturation of a high-temperature resistant magnetic sensitive element according to claim 1, characterized in that, The generated operating condition parameters include: Temperature data is obtained by acquiring the real-time operating temperature parameters of the magnetic sensing element through a temperature sensor. The measured current parameters are obtained through a current acquisition circuit to obtain current data; The temperature and current data are processed synchronously to generate operating parameters.

3. The method for suppressing high-current magnetic saturation of a high-temperature resistant magnetic sensitive element according to claim 2, characterized in that, The obtained magnetic circuit control commands include: Feature extraction is performed on the operating parameters to obtain temperature feature vector and current feature vector; The target permeability value is calculated using the mapping relationship between the temperature feature vector, the current feature vector, and the permeability. The target permeability value is encoded into a signal to obtain a magnetic circuit control command.

4. The method for suppressing high-current magnetic saturation of a high-temperature resistant magnetic sensitive element according to claim 3, characterized in that, The obtained permeability distribution includes: The target permeability value in the magnetic circuit control command is analyzed to obtain the adjustment parameters; Adjusting the lattice arrangement direction of the outer positive temperature coefficient magnetoresistive material layer to form a temperature-enhanced magnetoresistive channel; The inner high-saturation magnetic density material layer is combined with the temperature-enhanced magnetoresistive channel to obtain the magnetic permeability distribution state.

5. The method for suppressing high-current magnetic saturation of a high-temperature resistant magnetic sensitive element according to claim 1, characterized in that, The deformation action of the thermally deformable magnetic circuit switch includes: The trigger state of the temperature threshold is detected, and a trigger signal is generated; When the trigger signal is valid, a temperature load is applied to the bimetallic smart ring, generating directional expansion displacement; The directional expansion displacement is converted into mechanical thrust, which drives the thermally deformable magnetic circuit switch to deform.

6. The method for suppressing high-current magnetic saturation of a high-temperature resistant magnetic sensitive element according to claim 5, characterized in that, The step of using the deformation action to drive the movable magnetic shunt plate to cut into the main magnetic circuit includes: The mechanical thrust is transmitted to the movable magnetic shunt plate via a linkage transmission mechanism; The movable magnetic shunt piece is pushed along the guide rail to cut into the main magnetic circuit, forming a magnetic flux shunt path.

7. The method for suppressing high-current magnetic saturation of a high-temperature resistant magnetic sensitive element according to claim 6, characterized in that, The method of generating an eddy current magnetic field in the air gap region using the magnetic flux splitting path includes: Identify the air gap location formed by the magnetic flux splitting path and generate air gap parameters; Activate the wedge-shaped conductor array located at the air gap position; By utilizing the measured current to generate eddy currents in the wedge-shaped conductor array, a reverse suppression magnetic field is obtained.

8. The method for suppressing high-current magnetic saturation of a high-temperature resistant magnetic sensitive element according to claim 7, characterized in that, The suppression of magnetic saturation includes: Obtain the strength parameters of the reverse suppression magnetic field and generate magnetic field strength data; The magnetic field strength data is used to calculate the superimposed magnetic field distribution of the reverse suppression magnetic field and the main magnetic field, thereby reducing the peak magnetic flux density in the core region and generating a linearized magnetic field output.

9. The method for suppressing high-current magnetic saturation of a high-temperature resistant magnetic sensitive element according to claim 8, characterized in that, The method further includes: The temperature drift of the magnetic sensitive element is continuously monitored, and temperature drift data is generated. When the temperature drift data exceeds the tolerance range, the conduction phase of the wedge-shaped conductor array is adjusted to reconstruct the eddy current suppression waveform; The reconstructed eddy current suppression waveform is used to compensate for magnetic measurement drift, thereby improving the stability of the magnetic field signal output.

10. A high-current magnetic saturation suppression system for a high-temperature resistant magnetic sensitive element, applied to the high-current magnetic saturation suppression method for a high-temperature resistant magnetic sensitive element as described in any one of claims 1-9, characterized in that, The system includes: The operating condition monitoring module is used to acquire the operating temperature parameters and measured current parameters of the magnetic sensitive element and generate operating condition parameters. The magnetic circuit control module is used to perform calculations based on the operating parameters using a nonlinear coupling function to obtain magnetic circuit control commands. The gradient core adjustment module is used to adjust the gradient composite core composed of the inner high saturation magnetic density material layer and the outer positive temperature coefficient magnetoresistive material layer based on the magnetic circuit control command, so as to obtain the magnetic permeability distribution state. The temperature triggering module is used to drive the thermally deformable magnetic circuit switch to deform when the real-time temperature value of the outer positive temperature coefficient magnetoresistive material layer exceeds the temperature threshold. The magnetic flux shunting module is used to drive the movable magnetic shunting piece to cut into the main magnetic circuit by the deformation action, forming a magnetic flux shunting path. The eddy current suppression module is used to generate an eddy current magnetic field in the air gap region of the magnetic flux splitting path, suppress magnetic saturation, and output a stable magnetic field signal.

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