1417 results about "Constant current source" patented technology

The invention relates to the technical field of field data acquisition, in particular to an on-line temperature self-compensation calibration method and circuit for a force measurement transmitter. The calibration method comprises the steps that a working strain gauge and a temperature compensation gauge are synchronously excited through a two-way precision constant current source, the working strain gauge and the temperature compensation gauge are consistent in material parameter and are located in the same temperature field, and output current values of the two-way precision constant current source are equal and are controlled by a high-precision reference voltage source and a sampling resistor in a closed-loop mode. According to the invention, differential signals of the working strain gauge and the temperature compensation gauge are decoupled in real time through double-path precise constant-current source excitation and synchronous ADC acquisition technologies, gradient compensation is carried out on the temperature change rate in combination with a dynamic weighting algorithm, a lag error of traditional fixed coefficient compensation in a transient temperature field is effectively eliminated, and the accuracy of temperature compensation is improved. And online self-compensation of the temperature drift of the strain gauge is realized.

The embodiment of the invention discloses an abnormity monitoring system applied to a plasma etching machine. The abnormity monitoring system comprises constant current source equipment, a coil, a coil detection circuit and a controller, and the constant current source equipment is configured to output driving current according to preset etching process parameters; the coil is configured to generate a magnetic field in the etching cavity in response to the input of the driving current to guide the plasma to move towards the direction of the substrate so as to etch the substrate; the coil detection circuit is configured to detect coil state data of the coil; the controller is configured to generate device service information based on the coil state data. According to the embodiment of the invention, the working state of the coil is monitored through the coil state data, and the actual condition of the coil is reflected through the equipment maintenance information, so that a user can quickly know whether the coil is in an abnormal state, the user is helped to quickly position the maintenance direction, the user is prevented from detaching and maintaining the coil from the etching cavity, and the user experience is improved. And various resource investments wasted due to the fact that the coil is abnormal do not exist.

The invention relates to the technical field of medical instruments, in particular to a high-precision time interference non-invasive brain deep electrical stimulation method, equipment and system, and solves the problems that two stimulation electrodes are used for each pair of current in traditional time interference-based non-invasive brain deep electrical stimulation, so that the current distribution is relatively dispersed, and the stimulation focusing performance is relatively poor. According to the method, high-precision 4 * 1 electrode configuration is used, two electrodes for applying a stimulation current are changed into a 4 * 1 electrode form, the flowing path of the current is effectively limited, the current is more focused, and the focusing performance of the interference current is further improved. According to the device, high-precision current control is realized through the anti-phase output circuit, the 4 * 1 voltage division circuit, the constant current source module and the impedance detection module; the system supports forward and reverse electrode position optimization, a personalized real finite element head model simulation system based on MRI data is used for guiding practical application, the focusing performance of each pair of current in a target brain region is improved, and therefore the overall stimulation precision in the target brain region is improved.

The invention discloses a platinum resistor high-precision temperature measuring device capable of automatically identifying a wiring mode. The platinum resistor high-precision temperature measuring device comprises a power supply module, a signal detection module, an isolation module, a signal processing module and a cold end temperature measuring module. The power supply module supplies power to the signal detection and processing module. The signal detection module comprises a sensing probe, a wiring identification circuit, a constant current source, a measuring circuit and an analog-to-digital conversion circuit. The sensing probe measures the measured temperature, the wiring identification circuit automatically judges a two-wire system, a three-wire system or a four-wire system and feeds back a result, the constant current source provides positive and negative constant current excitation, and the measuring circuit collects and processes feedback voltage and then sends the feedback voltage to the analog-to-digital conversion circuit. The analog-to-digital conversion circuit is connected with the signal processing module through the isolation module, and the signal processing module calls a corresponding algorithm according to a wiring identification result and outputs final temperature data. According to the invention, high-precision temperature measurement at the grade of + / -0.02 DEG C can be realized in the range of-200 DEG C to 850 DEG C under the three / four-wire system and low-speed sampling conditions.

The invention discloses a wavelength and power adaptive compensation method and system for a DBR tunable laser, and relates to the technical field of tunable semiconductor lasers, and the method comprises the steps: controlling the operation of a laser through a constant current source, and collecting the wavelength and output power of the laser; performing signal processing on the wavelength and the output power; carrying out limiting processing on the wavelength accuracy and the power reference point of the laser; and adaptively compensating the output power and the wavelength of the laser based on the limiting processing. The problem of wavelength and power cross influence caused by inner loop feedback is solved, the structure is simple, output signals of the two monitoring units can be processed at the same time, and implementation is easy; a fuzzy PID control algorithm is adopted to monitor and stabilize power based on the power monitoring loop, a wavelength calibration algorithm is designed based on the wavelength monitoring loop to monitor and stabilize wavelength, and high-precision synchronous stabilization of the wavelength and the power of the laser is achieved.

The invention relates to a low-power-consumption Hall circuit, a wireless magnetic axis keyboard and a working method, and the low-power-consumption Hall circuit comprises a constant current source which provides constant current for the Hall circuit; the Hall device is driven by the current provided by the constant current source and outputs a Hall signal; the power supply on-off control module is used for controlling the working state of the constant current source, the power supply on-off control module comprises an enabling end, and the enabling end receives a level enabling signal; wherein when the level enable signal is a high level, the constant current source works, and the Hall device works; and when the level enable signal is at a low level, the constant current source stops working, and the Hall circuit enters a waiting state. According to the low-power-consumption Hall circuit, the Hall circuit can be controlled to enter the waiting mode so as to reduce power consumption, and meanwhile the response speed of the Hall circuit is not affected.

The invention relates to the technical field of fault detection, in particular to an electrical fault detection control system which comprises a phase monitoring module, an abnormity positioning module, a current control module and a result verification module. According to the method, the phase difference is calculated by combining collection and dynamic time warping, an abnormal mark is generated by comparing a phase tolerance threshold value, the phase delay detection precision is improved, based on an adjacent node phase difference value sequence, the slope kick is analyzed through linear regression, the candidate section judgment accuracy is enhanced, and a constant current source collects a multi-node voltage difference value; the Kalman filtering smoothes the voltage drop difference and compares the threshold value, improves the anti-interference capability of the complex working condition, compares the overlapping degree of the path coordinates and forms a closed loop verification mechanism with a re-check instruction, guarantees the reliability of the positioning result, shortens the fault response time through the multi-stage collaborative optimization, reduces the misoperation, and improves the discrimination robustness through the dynamic modeling and multi-source signal fusion. The dependence on experience or threshold is reduced; and the self-adaptive capability is enhanced.

The invention discloses a multi-mode perovskite and laminated cell comprehensive test system and method. The system comprises a darkroom, a test platform, an LED light source module, a CCD camera, a laser, an adjustable constant current source, an electronic load and an upper computer. The darkroom is used for shielding external ambient light and providing a dark test environment; the test platform is installed in the darkroom, and a to-be-tested battery is placed on the test platform; the LED light source module is used for providing a test light source; the CCD camera is used for capturing an optical signal generated by the battery to be tested in the testing process; the laser is used for emitting a laser beam to excite the to-be-detected battery to generate a specific optical response; the adjustable constant current source and the electronic load module can be electrically connected with a to-be-tested battery on the test platform, the adjustable constant current source is used for supplying current to the to-be-tested battery, and the electronic load module is used for simulating different load conditions; and the upper computer is used for realizing intelligent control of the test process and processing and display of test data.

The invention discloses an eddy current displacement sensor sine constant current source excitation method, and belongs to the technical field of sensor measurement and control. The method comprises the following steps: S1, generating positive and negative symmetric reference voltages through a reference voltage source circuit; s2, outputting a square wave control signal with adjustable frequency by the control chip, and driving a switching circuit to generate a square wave taking the positive and negative reference voltage as a level; s3, processing the square wave through a filter circuit to obtain a standard sine wave voltage signal; and S4, converting the sine voltage signal into sine constant current source excitation through a Howland current source circuit, and outputting the sine constant current source excitation to a sensor probe coil. According to the invention, through combination of digital control and analog conversion, the circuit structure is simplified, the cost is significantly reduced, and convenient adjustment of the output frequency and high stability and precision of the output current are realized at the same time.

The utility model discloses a constant current source circuit and a constant current source device, and the constant current source circuit comprises a power module which is used for providing an input current; the voltage reference module comprises a voltage reference unit and a first feedback unit, the first feedback unit is connected to the voltage reference unit, the voltage reference unit is used for providing a reference voltage, and the first feedback unit is used for generating a first constant voltage according to the reference voltage; and the constant current module is connected to the power supply module and the first feedback unit, and the constant current module is used for converting the input current into a first constant current according to the first constant voltage. The voltage reference unit is adopted to generate the reference voltage, the first feedback unit is adopted to generate the constant first constant voltage according to the reference voltage, and the constant current module converts the input current provided by the power supply module into the first constant current according to the first constant voltage, so that the first constant current is only associated with the reference voltage; even if the circuit temperature changes or the load changes, stable constant current output can be maintained.

The invention discloses a PT symmetrical hot-pressing resistance MEMS wind speed and wind direction sensor. The sensor comprises four groups of PT symmetrical MEMS resonators which are orthogonally distributed and have hot-pressing resistance feedback; the PT symmetrical MEMS resonator comprises two cantilever beam resonators with completely same structures, a coupling spring beam connected with the two resonators, and a constant current source connected with one resonator, each cantilever resonator comprises two anchor areas, a wide beam connected with the anchor areas, a narrow beam with a piezoresistive effect, a warped thin plate structure and external electrodes located on the two sides of the thin plate structure. Wind speed and wind direction signals are converted into rigidity change of the resonator array through mechanical action by means of a warped thin plate structure, and the rigidity change enables the PT symmetrical MEMS system to deviate from an EP point, so that system frequency splitting is caused. As the frequency splitting quantity of the PT symmetric system is in direct proportion to the square root of the disturbance quantity, the wind speed and direction sensor can detect tiny wind speed signals, and has the advantages of very high sensitivity, simple process, high integration level and the like.

The invention relates to the technical field of gas detection, in particular to a detection circuit based on an NTC thermistor and a heat conduction meter. The detection circuit based on the NTC thermistor comprises a main NTC thermistor which is suspended in air flow; the constant current source circuit is used for providing constant working current for the main NTC thermistor; the detection resistor is arranged between the main NTC thermistor and a ground node; the ADC sampling circuit is used for sampling analog voltages at two ends of the detection resistor into digital signals; the constant temperature adjusting circuit is used for controlling the magnitude of the current output by the constant current source circuit according to the voltage of the main NTC thermistor, so that the main NTC thermistor is kept at the target temperature; the temperature compensation circuit is used for detecting the temperature of the environment where the heat conduction measuring meter is located; and the processing unit is used for determining a detection result according to the digital signal and compensating the detection result according to the environment temperature. According to the detection circuit based on the NTC thermistor, the response speed and the measurement precision of measurement are improved.

The invention discloses a system and a method for testing the dynamic on resistance of a power GaN device. The testing system comprises a low-voltage power supply, a booster circuit, a constant current source circuit, a clamping circuit and a driving circuit, the low-voltage power supply is connected with the booster circuit; the test module comprises a switch tube QC and tested device groups Q1, Q2... Qn, the drain electrode of the control tube QC is connected with one side of the booster circuit, the source electrode of the control tube QC is connected with the drain electrode of the GaN device Q1, the source electrode of the GaN device Q1 is connected with the drain electrode of the GaN device Q2, the source electrode of the GaN device Q2 is connected with the drain electrode of the GaN device Q3,..., and so on, the source electrode of the GaN device Qn-1 is connected with the drain electrode of the GaN device Qn, and the source electrode of the GaN device Qn is grounded; the grid electrode of the switching tube QC and the grid electrodes of the tested device groups Q1, Q2... Qn are connected with the driving circuit; source electrodes and drain electrodes of the tested device groups Q1, Q2... Qn are respectively connected in parallel with resistors R1, R2... Rn. The tested device groups Q1, Q2... Qn are connected with the constant current source circuit; two ends of the resistors R1, R2... Rn are respectively connected with a clamping circuit, and the clamping circuit is connected with a data acquisition system. The reliability of measuring the dynamic on-resistance of the gallium nitride device is improved.

The present disclosure provides an overcurrent detection circuit for detecting overcurrent conditions in a battery / battery pack during charging and discharging. The circuit controls the charging and discharging of the battery / battery pack via a charge control transistor and a discharge control transistor connected in series with the battery / battery pack. The drain of the charge control transistor is connected to the drain of the discharge control transistor. The overcurrent detection circuit includes: a first detection transistor and a second detection transistor; a first voltage acquisition circuit and a second voltage acquisition circuit; a constant current source; and a comparison unit. The present disclosure also provides an integrated device and a battery management system.

The invention discloses a sensor data acquisition and processing device for a diamond self-temperature sensing tool. The device comprises a low-temperature drift multi-stage constant current source circuit, a voltage stabilizing circuit, a two-stage differential amplifier circuit, an analog-to-digital conversion circuit, a microprocessor main control circuit, a data transmission circuit, a user interaction circuit and a power management circuit. The sensor data is acquired by a four-wire method, that is, the voltage signal output by the diamond self-temperature sensing tool sensor is acquired by outputting an excitation current, different constant current source sizes are acquired, a microampere-level weak constant current source output is configured, a multi-stage resistor network is constructed to realize multi-speed switching of the constant current source, and effective acquisition of the millivolt / microvolt weak voltage signal of the self-temperature sensing diamond tool under the excitation current is realized. The sensor data acquired by acquisition and processing has high sensitivity, precision and response speed, and the temperature of the cutting area can be measured online.

The invention discloses a device and a method for monitoring the integrity of a small-size metal sample in a high-pressure environment. An environment control system; the loading system comprises an electronic testing machine and a connecting rod, and the electronic testing machine loads a small-size metal sample installed in the high-pressure kettle in an electric insulation mode through the connecting rod to achieve stress or strain controlled loading; the electric signal measurement system comprises a constant current source, a current commutation device and a signal acquisition device. The constant current source applies a constant current to the small-size metal sample, the current reversing equipment switches the direction of the constant current at a preset frequency, and the signal acquisition equipment intermittently monitors voltage values at two ends of the small-size metal sample; and determining the integrity change of the small-size metal sample according to the change of the voltage value in the loading process. According to the invention, on-line monitoring of the integrity of the small-size metal sample is realized in a high-pressure environment.

The invention discloses a comprehensive analysis device and a monitoring method for stress corrosion of an ocean structure. The device comprises a stress loading device, a multi-channel micro-resistance measuring device and a measuring assembly, the stress loading device can apply different elastic stresses to the multiple groups of measuring assemblies; each group of measuring components comprises a measuring element, a reference element and a stress measuring element, and each group of measuring components is provided with a plurality of monitoring areas; the multi-channel micro-resistance measuring device comprises a constant current source, a plurality of voltage measuring modules and a relay module, the multi-channel micro-resistance measuring device can sequentially obtain the resistance of different measuring elements and reference elements at different moments, and then the corrosion rates of the measuring elements under different elastic stresses are obtained. According to the marine structure stress corrosion comprehensive analysis device disclosed by the invention, the corrosion rates of the measuring elements under different elastic stresses can be conveniently obtained, so that the simulation of the corrosion rates of the marine structure under different elastic stresses is realized.

The invention provides an enhanced non-invasive deep brain electrical stimulation system and method based on time interference. The system comprises an enhanced sawtooth wave stimulation waveform; a stimulation circuit supporting the enhanced sawtooth waveform; a finite element simulation subsystem to guide the stimulation pattern. Compared with the traditional time interference based on sine waves, the time interference based on sawtooth waves generates a steeper envelope, so that the stimulation intensity is enhanced. The sawtooth wave spectrum component is more complex and contains more high-frequency components, and a specific constant current source stimulator is needed to ensure that the high-frequency components output constant current without distortion. The system also includes a simulation subsystem that determines stimulation parameters using a corrected finite element method and a stimulation subsystem that stimulates in accordance with the parameters. Compared with traditional sine waves, the non-invasive deep brain electrical stimulation based on sawtooth wave time interference is provided, the stimulation intensity is improved, and a more effective method is provided for non-invasive regulation and control of the brain and intervention of diseases.

The invention provides a laser welding control system and method.The system comprises a temperature feedback regulation and control module, a PLC control module, a half-bridge driving module and a constant-current source device.According to the system, an instruction is transmitted to the PLC control module on the basis of a temperature signal and a temperature state signal obtained through real-time monitoring of the temperature feedback regulation and control module; the PLC control module controls starting and stopping of a laser and a cooling system in the welding process according to different temperature state signals, when the temperature state signals are in the range lower than a laser PWM regulation starting threshold Tset and higher than a lowest temperature threshold Tmin, PWM regulation and control are conducted on the transmitting power of the laser, meanwhile, a constant current source circuit is started, and the laser is driven to weld through constant current; besides, on the basis of light beam space distribution calculation and high-temperature beam width and low-temperature beam width analysis, the optimal PWM duty ratio and frequency are solved through iterative optimization, stable welding quality is ensured, welding precision is improved, and welding defects are reduced.

The utility model relates to a power supply device and a testing machine, the power supply device comprises a main loop, a voltage loop, a current loop and a clamping circuit, in a pressurization mode, when a detection current output by the clamping circuit at the current loop is in a set current clamping range, the output impedance is high resistance; and when the detection current output by the current loop is not in a set current clamping range, the clamping circuit triggers the clamping current to carry out analog output, and the output impedance is switched to low resistance, so that the output of the main loop is equivalent to a constant current source. In the current adding mode, when the detection voltage output by the clamping circuit at the voltage loop is within a set voltage clamping range, the output impedance is high resistance; and when the detection voltage output by the voltage loop is not in a set voltage clamping range, the clamping circuit triggers the clamping voltage to perform analog output, and the output impedance is switched to low resistance, so that the output of the main loop is equivalent to a constant voltage source. The simulation regulation function is achieved, and the response speed is high.

The invention provides a delay circuit applied to a time-interleaved analog-to-digital converter, the circuit comprises a first delay module, a second delay module and a delay selector, the first delay module is composed of multiple stages of delay units connected in series, each stage comprises a fixed inductor connected in series and a variable capacitor connected in parallel, and is used for providing large-range adjustable delay; the second delay module is connected to the output end of the first delay module and comprises a parallel combination of an adjustable constant current source and a programmable capacitor array, high-precision delay adjustment is achieved, the minimum adjustment step length of the second delay module is smaller than that of the first delay module, and multiple input ends of the delay selector are connected with output nodes of all stages of delay units respectively. The selection module is used for selecting coarse delay signals in different stages; the circuit realizes low-noise coarse delay adjustment through the inductance-capacitance network, completes high-precision fine delay adjustment by using current-capacitance combination, and has the advantages of wide delay range, high adjustment precision, low noise, good stability and the like.

The invention relates to the technical field of power management in an integrated circuit, in particular to an ultra-low noise LDO with a programmable current limit and quick start. Comprising a reference current generating circuit, an RC filter, a first negative feedback loop, a control resistor, a comparison control circuit, a programmable current limiting circuit, a sampling tube MP0 and a first switch current source. The first negative feedback loop comprises an error amplifier, a buffer stage and a power tube MP1; before the LDO is started, current limit programming is achieved; after current limit programming is finished, the LDO starts to start, an LDO quick start control signal is generated through the programmable current limit circuit, an extra charging path is provided for the RC filter circuit through the constant current source, and quick start of the ultralow-noise LDO is achieved; when the output voltage of the LDO is close to a preset value, the quick starting circuit is closed; according to the LDO, the current limit is adjustable, the protection capability to the rear stage is improved, and the reliability of the whole system is enhanced.

The embodiment of the invention provides a display driving method, a display driving device, a display driving system and display equipment, and relates to the technical field of display. The display driving method comprises the following steps: acquiring a data writing instruction for current frame display data; the data writing instruction comprises gray scale data information and black frame insertion control information of each partition; for each partition, a display driving signal is output to the corresponding constant current source based on the gray data information, and a black insertion control signal is output to the corresponding constant current source according to the frequency corresponding to the black insertion control information based on the black insertion control information; wherein the display driving signal is used for controlling the constant current source to output corresponding driving current, and the black frame insertion control signal is used for closing the constant current source. According to the embodiment of the invention, the black insertion control signal can be output to the corresponding constant current source according to the frequency corresponding to the black insertion control information, so that the effective time period proportion difference of the black insertion control signal of each frame of display data of each partition is small, the display brightness is not influenced, and the problem of display flicker is avoided.

The utility model discloses an IEPE circuit comprising a signal detection unit and a power supply unit, the power supply unit supplies power to the signal detection unit, the signal detection unit comprises a charge amplifier and a transient surge current suppression unit, the transient surge current suppression unit is connected with the charge amplifier in parallel, the power supply unit comprises a constant current source, and the constant current source is connected with the charge amplifier in parallel. And the constant current source supplies power to the charge amplifier. The interference suppression circuit is suitable for the IEPE sensor, can effectively suppress interference, and ensures the effectiveness of an output signal of the IEPE sensor.

According to the BMS test platform and the test method thereof, the cost is low, the safety is high, the controllability is high, the stability is high, the test result is more accurate, and the test efficiency can be improved. The system comprises an industrial control host and a BMS test system cabinet. The BMS test system cabinet comprises a virtual battery simulation unit, a temperature simulation detection unit, a high-voltage constant-voltage source, a high-precision constant-current source, a Hall-shunt simulation detection unit, a CAN communication detection unit, a high-precision programmable DC power supply, an insulation resistance simulation test unit, an insulation withstand voltage test unit, and a signal detection and drive simulation detection unit. An I / O driving detection unit; and a charging signal simulation detection unit. The invention is applied to the technical field of battery management systems.

The invention discloses an automatic temperature compensation circuit and method based on a thermal flowmeter, and relates to the technical field of temperature compensation, and the compensation circuit comprises a constant current source module used for driving the thermal flowmeter; the Wheatstone virtual bridge arm is used for acquiring a changed digital-to-analog converter output voltage value output by the controller, and performing voltage conversion on a first voltage and a second voltage which are output on the thermal flowmeter due to the change of the external temperature according to the output voltage value to obtain a third voltage; the digital-to-analog converter is used for performing correction compensation on the third voltage according to the correction compensation value calculated by the controller; and the differential amplification module adopts a differential amplifier to amplify the third voltage and the fourth voltage output by the thermal flowmeter, and outputs a compensated flow signal. The compensating circuit is simple in structure and higher in reliability and precision, and compared with a digital potentiometer, the output value of the Wheatstone virtual bridge arm is changed by using the output value of the digital-to-analog converter, so that the adjusting resolution is higher.

The invention relates to a surge protector withstand voltage test system and method, and belongs to the technical field of surge protectors, the system comprises a test tool, the test tool comprises a tool body, a pneumatic execution component and a PCB function board, the tool body is made of bakelite, metal handles are arranged on the two sides of the tool body, and a detachable cover plate is fixed to the bottom of the tool body through hinges and lock catches; a wiring groove is formed in the inner side of the cover plate; the pneumatic execution component comprises a double-piston cylinder, a slide rail, a clamp assembly and an elastic conductive elastic needle; the double-piston cylinder drives the clamp assembly to linearly move along the X direction through the slide rail so as to clamp the surge protector to be tested; the elastic conductive elastic needle is fixed on the clamp assembly, the head of the elastic conductive elastic needle is in elastic contact with an exposed contact of the tested surge protector, and the tail of the elastic conductive elastic needle is connected to the PCB function board through a wire; the PCB function board comprises a high voltage constant current source circuit, a multipath relay switching circuit and an MCU control module.

The invention belongs to the technical field of new energy automobile lithium battery thermal runaway early warning, and particularly discloses a lithium battery thermal runaway gas early warning system. The method is used for solving the problem that thermal runaway cannot be rapidly and accurately detected and early warning cannot be carried out in advance in the existing monitoring technology. The early warning system comprises a main control unit, a core processing unit, a graphical user interface, a dual-frequency driving signal generation circuit, a spectral signal dual-frequency demodulation circuit, a temperature control circuit, a constant current source and overcurrent protection circuit, a spectral data acquisition circuit, a graphical user interface, an optical system, a gas sampling device and an early warning model. The power supply of the early warning system adopts a three-stage voltage reduction design, and comprises an AC-DC switching power supply, a DC-DC switching power supply and a low dropout regulator. Based on the off-axis integral cavity optical path coupling technology of the double-optical wedge group, the light beam angle is accurately adjusted through the double optical wedges of the stepping motor, a beam combiner does not need to be used, and the light energy utilization rate and the detection sensitivity are improved.

The invention provides a magnetic field polarity monitoring system applied to a plasma etching machine, and relates to the technical field of magnetic field polarity monitoring, the magnetic field polarity monitoring system is used for monitoring whether the magnetic field polarity is successfully switched, the magnetic field polarity monitoring system comprises a controller, a coil and a constant current source device, the controller is configured to send a magnetic field polarity switching instruction to a power supply output circuit; the power output circuit is configured to output a target driving signal to the coil; the coil is configured to switch magnetic field polarity in the etching cavity in response to a target driving signal; and the polarity monitoring circuit is configured to monitor a target driving signal output by the power supply output circuit and feed back a magnetic field polarity switching result to the controller according to the target driving signal and the magnetic field polarity switching instruction. By adding the polarity monitoring circuit, active monitoring of the polarity of the output magnetic field of the constant-current source equipment can be realized, the output accuracy of the constant-current source equipment is improved, the working efficiency of the coil is improved, and the running safety of the constant-current source equipment and the coil is also improved.

The invention relates to a self-compensating contact resistance on-line monitoring device and method in a high-temperature environment, and the device comprises a contact point which is used for forming a contact resistance to be measured; the thermocouple is used for monitoring the temperature in the high-temperature box in real time; the constant current source system is used for applying a constant test current to the contact point and dynamically adjusting an output current value; the signal conditioning circuit is used for filtering high-frequency interference in the voltage signal; the data acquisition card is used for acquiring voltage signals at high speed; and the processor is used for calculating the real value of the compensated contact resistance. The LSTM network based on Kalman filtering and physical constraint has the beneficial effects that in the LSTM network based on Kalman filtering and physical constraint, the KF outputs the denoised base value state in real time through dynamic fusion observation value and model prediction, and clean input is provided for the LSTM. The LSTM models a temperature-resistance nonlinear relation based on a denoising result of the KF, and makes up for a linear hypothesis defect of the KF.