2997 results about "Sampling circuits" patented technology

The invention relates to the technical field of integrated circuit test and calibration, and discloses a chip test and calibration method and a chip tester. The chip test calibration method is applied to a chip test module and specifically comprises the following steps that S101, a starting signal sent by a user terminal is received, environment initialization operation is executed, and after initialization is completed, a system automatically enters a standby mode and waits for an external trigger signal or a user instruction; and S102, synchronously capturing input and output signal waveforms of the tested chip at a preset sampling frequency through a high-precision current sensor and a voltage sampling circuit. Through a dynamic parameter acquisition and real-time compensation technology, a voltage reference error is effectively reduced, the temperature control precision is superior to + / -0.3 DEG C, signal distortion caused by environmental interference is effectively inhibited, a multi-dimensional calibration model is combined with time domain, frequency domain and statistical characteristic analysis, nonlinear errors and system drift can be dynamically corrected, and the system performance is improved. And the attenuation error of a test signal transmission path is lower than 0.02 dB.

The invention relates to the technical field of data acquisition, and discloses a distributed photovoltaic data acquisition method and device based on time synchronization. The method comprises the following steps: performing distributed transmission processing on nanosecond synchronous acquisition reference signals through a time delay compensation network to obtain trigger synchronization signals of a plurality of acquisition nodes, and performing data acquisition processing through a multi-channel parallel sampling circuit to obtain original voltage and current data; and carrying out data verification processing on the original voltage and current data through a digital filtering algorithm to obtain effective acquisition data, carrying out string matching analysis processing to obtain string feature distribution, and carrying out data screening processing through a state evaluation algorithm to obtain real-time performance data of the photovoltaic module. Through high-precision clock synchronization and parallel sampling technologies, nanosecond sampling synchronization of a plurality of acquisition nodes is realized, and the acquisition data is ensured to have a strict time sequence corresponding relation, so that an accurate data basis is provided for performance evaluation and fault diagnosis of the photovoltaic module.

The invention provides a common-mode feedback circuit and a differential amplifier thereof, the common-mode feedback circuit comprises a sampling circuit and an amplifier circuit, the sampling circuit comprises a first input end, a second input end and a first output end, the first input end receives a first differential signal Voutp, and the second input end receives a second differential signal Voutn; the level shift module comprises a third input end, a fourth input end and a second output end, receives a common-mode signal VCMS and a reference common-mode signal VOCM output by the sampling circuit, and adjusts the common mode of the common-mode signal VCMS and the reference common-mode signal VOCM to enable the second output end to output a common-mode feedback signal VCMFB processed by the level shift module; the amplifier circuit receives a common mode feedback signal VCMFB. After the technical scheme is adopted, the same speed as that of a differential loop can be realized, the current of a main operational amplifier can be multiplexed, the power consumption of a common-mode loop is far lower than that of a main loop, and meanwhile, the common-mode level can be randomly adjusted.

The invention relates to the technical field of direct-current power supply fault diagnosis, in particular to a fault self-diagnosis modular direct-current power supply system, which is characterized in that a failure mechanism dynamic modeling unit constructs a multi-stress coupling degradation mapping library, adopts a degradation mechanism decoupling algorithm to separate and superpose failure effects and generates a dynamic degradation model; the early degradation capture unit deploys a high-frequency wide-domain sampling circuit and a noise suppression signal chain, combines time-frequency domain joint feature extraction and separates degradation feature signals from background noise, and the self-adaptive life prediction unit adopts a long short-term memory network and random forest fusion algorithm to dynamically correct parameters and output residual life probability distribution. The intelligent fault judgment unit realizes progressive diagnosis through a hierarchical threshold decision mechanism, and the health management cooperative execution unit triggers a pre-maintenance strategy, executes power flexible derating, redundancy switching or directional fusing isolation, and improves the reliability of the system.

The invention discloses a dual-compensation active common-mode EMI filter based on impedance mismatch and a design method thereof, and belongs to the technical field of filter design, the dual-compensation active common-mode EMI filter is connected between an interfered end and an interference source end, the dual-compensation active common-mode EMI filter comprises a voltage sampling circuit, a signal amplification circuit and a compensation circuit, the compensation circuit comprises a voltage injection module and a current injection module, the first end of the voltage injection module is connected with the first end of the voltage sampling circuit, the second end is connected with the second end of the signal amplification circuit, and the third end is connected with the first end of the interference source end; the first end of the current injection module is connected with the second end of the signal amplification circuit, the second end is connected with the third end of the voltage injection module, and the third end is connected with the second end of the interference source end. According to the invention, the insertion loss of the filter can be significantly improved, the filter has an effective bandwidth enough to cover and conduct electromagnetic interference, has better attenuation on full-band noise signals, and has the advantages of small size and high insertion loss.

The invention discloses a current and voltage signal synchronous correction and output method and system, and relates to the technical field of power system analysis and control. Compared with a previous current and voltage signal correction method, the method solves the problems that traditional multi-channel signal acquisition depends on conventional clock control, and synchronization precision is insufficient; a conventional sampling circuit is weak in anti-interference capability. The problem that an existing scheme lacks efficient error prediction and dynamic optimization capability is solved. Through a multi-channel FPGA clock synchronization and double-differential sampling technology, complete acquisition of high-frequency transient characteristics of voltage and current signals is ensured; a dynamic calibration algorithm and multi-stage composite filtering are combined, so that common-mode interference and non-linear errors are effectively suppressed; and finally, through optical fiber isolation output and intelligent feedback control, signal full-link synchronous correction is realized, the electric energy metering error can be reduced, the fault positioning precision is improved, the characteristics of high precision, strong anti-interference and low energy consumption are realized, and a reliable data reference is provided for intelligent power grid and new energy grid connection.

The invention provides a liquid crystal display lightening parameter self-adaptive calibration method, and relates to the technical field of image display. The method comprises the following steps: firstly, establishing a characteristic matrix and a parameter library of liquid crystal molecules, and dynamically correcting according to a real-time working state; and based on the characteristic matrix and the parameter library, executing pixel-level forward prediction on the input image, and generating a color error distribution diagram by solving a coupling solution of a liquid crystal molecule dynamic response differential equation and a backlight attenuation compensation equation. And taking the error distribution diagram as input, obtaining a gradient optimization direction of the calibration parameter mapping diagram through back propagation calculation, and iteratively approaching the optimal pixel value compensation amount in each frame period. And injecting a test pulse into the characteristic pixel point, capturing a voltage response curve through a sampling circuit, and converting the voltage response curve into a real-time correction value mapping graph. And finally, carrying out weighted fusion on the real-time correction value mapping graph and the pixel value compensation amount to generate a calibration parameter mapping graph. The self-adaptive calibration of the display parameters is improved, and the display consistency and the color accuracy are effectively improved.

Disclosed in the present invention are a resistor-based voltage-withstanding on-state voltage drop measurement circuit for junction temperature monitoring, and a monitoring method. The measurement circuit comprises: a high-resistance series high-voltage resistor RL; switching diodes D1 and D2; a low-voltage MOSFET M1; a phase inverter U1; a three-state gate U2; an RC delay circuit consisting of a resistor R1 and a capacitor C1; current-limiting resistors R2 and R3; auxiliary voltage sources VDD and VCC; an operational amplifier U3; and an isolation operational amplifier U4. The monitoring method comprises: designing an on-state voltage drop sampling circuit based on a high-resistance resistor, and performing parameter selection on the basis of an actual application scenario; measuring a collector current and on-state voltage drop model at different junction temperatures under offline conditions, so as to provide a calculation model for online monitoring; and under online conditions, performing online monitoring of junction temperature on the basis of the model obtained by means of performing testing under the offline conditions. The present invention has the advantages of being low cost, having high reliability, and adaptability to on-state voltage drop measurement at a high voltage and within a wide ambient temperature range.

The invention discloses a rapid thermal simulation method and system for a semiconductor power assembly, and relates to the technical field of semiconductors, and the method comprises the steps: collecting a voltage V (t) signal and a current I (t) signal of the semiconductor power assembly in real time through a voltage and current sampling circuit, constructing a power pulse input sequence A, and carrying out the hot carrier accumulation analysis according to the power fluctuation change amplitude; introducing a transient thermal resistance function Zth (t), fitting the transient thermal resistance function Zth (t) with a hot carrier pulse response index Mcx after numerical integration to analyze junction temperature change caused by power pulse, and evaluating an equivalent junction temperature dynamic change rate; when the analysis result is that the thermal drift out-of-control trend exists, thermal risk analysis is carried out, and thermal risk state assessment is generated; the simulation model optimizes thermal model parameters and outputs thermal control suggestions through a rollback correction path, and the working state of the semiconductor power assembly is automatically adjusted. According to the method, real-time monitoring and effective prevention and control of thermal runaway can be realized, and the reliability and safety of the semiconductor power assembly are improved.

The invention discloses an LLC-DCDC fault protection method and device based on resonance current and pulse integration. The method comprises the following steps that an alternating current signal on an LLC converter resonance inductor is collected in real time through a resonance inductor current sampling circuit; inputting the current signal into a hardware comparator module, comparing the current signal with a preset current threshold value, and outputting a pulse signal; inputting the pulse signal into a pulse integral module for integral processing, and outputting an integral voltage signal; the CPU control unit receives a pulse signal output by the hardware comparator and an integral voltage signal output by the integral module in real time, and judges whether a fault occurs or not according to preset logic; and if the fault is judged, the driving signal of the primary inverter bridge of the LLC converter is cut off through the driving cut-off module.

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 provides a correlated double-sampling program-controlled gain amplifier for a high-energy particle detection pixel sensor and an implementation method, and solves the technical problem that a large dynamic range and high readout precision cannot be considered at the same time during existing high-energy particle detection. The circuit comprises a correlated double-sampling circuit, a signal polarity conversion circuit, an amplification feedback circuit and a configuration automatic judgment circuit. The correlated double sampling circuit is used for performing double sampling on the output voltage of the pixel signal to obtain twice sampling voltage; the configuration automatic judgment circuit is used for selecting configurations for switching according to the voltage difference between the two sampling voltages to obtain an output signal; and the amplification feedback circuit is used for performing fixed gain voltage amplification on the output signal to obtain an amplified voltage signal. The circuit can be widely applied to the technical field of integrated circuits.

According to the pure hardware PID current control system and method based on the direct current brushless motor provided by the invention, the negative voltage interference generated by electromagnetic induction is directly filtered in the bus current signal acquisition stage through the cooperation of the current sampling module and the bus negative voltage elimination module; the problem of signal distortion caused by negative voltage in a traditional sampling circuit is eliminated, and the current effective value detection precision is improved; the PID control module constructed based on pure hardware calculates a difference value between a target voltage and an actual voltage in real time through an analog circuit, and generates a proportional, integral and differential composite compensation signal, so that a PWM modulation circuit can adjust duty ratio output in real time according to the compensation signal, and it is ensured that a bus current of a motor driver is rapidly converged to a target value; the whole scheme does not need to depend on a microcontroller and a complex software algorithm, closed-loop current control is achieved through discrete devices, and the system cost is reduced.

The invention discloses a frequency converter multi-stage cooperative rapid overcurrent protection circuit, and the overcurrent protection circuit cooperates with an IGBT inverter circuit, an IGBT drive circuit, a current sampling circuit and a master control MCU of a frequency converter to construct a three-stage cooperative protection system composed of hardware-stage extreme rapid protection, hardware-stage rapid protection and software-stage intelligent protection. And independent action and information interaction between the stages can be realized through circuit design. Compared with the prior art, protection blind areas are eliminated, nanosecond-microsecond level extreme protection is achieved, a multiple and high-reliability redundancy protection system is constructed, intelligent grading processing of faults is achieved, and the diagnosability of the system is enhanced.

The invention relates to the technical field of photovoltaic power management, and discloses a photovoltaic charging management system of a field scientific observation station, which comprises a single chip microcomputer, a battery charging and discharging management module, a switching circuit and a sampling circuit, the battery charging and discharging management module manages charging and discharging of the battery and outputs the real-time state of the battery to the single-chip microcomputer. The sampling circuit samples the discharging condition of the photovoltaic panel output circuit or the battery and transmits sampling information to the single chip microcomputer; the single-chip microcomputer comprises a monitoring module and a switching module. The monitoring module judges whether the battery or the battery charging and discharging management module works abnormally according to sampling information. And the switching module carries out automatic charging management of photovoltaic charging or battery charging on the to-be-charged equipment. By intelligently switching the power supply mode, the service life of the battery is prolonged, the stability of power supply in a low-power-consumption mode is ensured, the power supply efficiency is improved, and remote real-time data monitoring and analysis are provided.

A relay welding diagnosis method and a power battery system. The method comprises: collecting a first front end voltage and a first rear end voltage of a main positive relay (S301); when it is determined, on the basis of the first front end voltage and the first rear end voltage, that the main positive relay is in a non-welded state, closing a pre-charge relay and collecting a second rear end voltage of the main positive relay, and when it is determined, on the basis of the second rear end voltage, that the pre-charge relay has been successfully closed, collecting a third rear end voltage of a main negative relay (S302); and when it is determined, on the basis of the third rear end voltage, that the main negative relay is in a non-welded state, disconnecting the pre-charge relay and collecting a fourth rear end voltage of the main positive relay, and when it is determined, on the basis of the fourth rear end voltage, that the pre-charge relay has been successfully disconnected, determining that no welding currently exists (S303). Thus, the problem of high detection cost caused by the need for two high-voltage sampling circuits in relay welding detection circuits is solved, and simultaneous detection of a main positive relay and a main negative relay is realized.

The invention discloses a real-time acquisition and monitoring device for an electrochemical impedance spectrum of a transformer substation storage battery, and the device comprises a waveform generator which is used as a current excitation source and generates a current excitation signal; the switch switching circuit is used for switching the sections of the current excitation signals received by the battery monomers; the sampling circuit obtains response voltage signals of the single battery based on the current excitation signals of different sections; and the control signal processing circuit performs fast Fourier transform on the response voltage signal, and obtains the electrochemical impedance spectrum of the transformer substation storage battery based on the transformed response voltage processing signal. According to the invention, measurement is carried out in a current excitation and voltage response mode, and electrochemical impedance spectroscopy data of the storage battery in a floating charge state can be acquired on line; a current excitation signal is output by adopting sine waves with the same amplitude at a to-be-tested frequency point, so that the problem of errors in a storage battery electric signal impedance spectroscopy test process is solved; the method can be flexibly and conveniently applied to a transformer substation, and reduces the cost of storage battery electrochemical impedance spectroscopy detection.

The invention provides an AC solid-state power controller isolation voltage acquisition circuit device, and the device comprises an AC voltage acquisition unit which is used for achieving the voltage acquisition of an AC solid-state power controller; the isolated power supply unit is used for providing an isolated power supply for the alternating-current voltage acquisition unit; the reference voltage unit is used for providing reference voltage for the AC voltage acquisition unit; and the power supply unit provides a power supply for the AC voltage acquisition unit. According to the technical scheme of the invention, the size of the sampling circuit can be reduced while voltage acquisition is realized, and the acquisition precision and safety of the sampling circuit are improved.

This invention provides a method for detecting quench in a superconducting coil using leakage current, comprising the following steps: Step 1: Determine a first detection connection point on the main superconducting tape adjacent to a first current connection point, wherein the first detection connection point and the first current connection point are equipotential points; Step 2: Determine a second detection connection point on the sampling superconducting tape, wherein the second detection connection point and the second current connection point are equipotential points; Step 3: Connect a leakage current sampling circuit to the first and second detection connection points. If the leakage current sampling circuit detects leakage current, it is determined that quench exists in the main superconducting tape. This invention uses a leakage current sampling circuit to solve the problem of difficulty in sampling the quench voltage of superconducting magnets.

The utility model provides a fuse state monitoring circuit and a power distribution system, the fuse state monitoring circuit comprises a fuse connected between a power supply and a load, and the other end of the load is grounded; two ends of the fuse are respectively connected with a first resistor and a second resistor, and the other end of the first resistor and the other end of the second resistor are connected in series with a third resistor to be grounded after being connected; the fuse protection circuit further comprises a voltage sampling circuit which is connected with the voltage sampling end of the third resistor through a sampling channel, and the state of the fuse is monitored according to the sampling voltage of the voltage sampling circuit to the third resistor. According to the invention, state monitoring and voltage monitoring of the fuse are realized by differentiating voltages at two ends of the fuse and connecting the resistors in series, voltage detection of a circuit can be realized, state monitoring of the fuse can also be realized, and the fuse monitoring circuit has the advantages of simple structure and low cost.

The invention provides a control system for locking a bias working point of a silicon-based chip of an MZM structure, which comprises the silicon-based chip, two sampling circuits, an MCU control unit, a multi-channel operational amplifier and an upper computer, and is characterized in that the silicon-based chip comprises an MZM modulator, the MZM modulator comprises a modulation arm A, a modulation arm B, a heater, an A-arm photodiode and a B-arm photodiode, a sampling circuit collects voltage and current signals on a driving arm on the MZM modulator for feedback, the voltage and current signals are transmitted to a peripheral MCU control unit and uploaded to an upper computer, and the MCU control unit regulates and controls the voltage or current of a modulation arm A through a multi-channel operational amplifier. The invention further provides a control method of the control system for locking the bias working point of the silicon-based chip of the MZM structure. The occupied space in the high-speed optical module is small, so that the layout of other electric chips is facilitated, and higher circuit reliability is realized; a brand-new and accurate control method is designed.

The invention discloses an emergency energy storage cabin with a multi-source power generation intelligent switching function and a power supply control method thereof, and relates to the field of emergency energy storage, and the energy storage cabin comprises a photovoltaic power generation device which is arranged at the top and can stretch and unfold a photovoltaic panel, a hydrogen energy storage power generation device connected with a bus, and an energy storage battery pack, in cooperation with the voltage and current sampling circuit and the illumination sensor, the controller controls switching among the power supplies according to acquired signals. The switching priority is photovoltaic power generation priority, the energy storage battery pack is subordinate, and the hydrogen energy storage power generation device is the last standby; the system is provided with a current limiting element, a pre-charging control unit and a graded load management function, and can cut off non-critical loads and supply critical loads in turns when a power supply is insufficient. The interior of the cabin can integrate water purification, hydrogen production, hydrogen storage and air conditioning modules. According to the method and the system, intelligent switching of multi-source energy, key load guarantee and continuous energy supply in an emergency environment are realized.

The invention discloses a three-degree-of-freedom ultrasonic motor driving control method. A three-degree-of-freedom ultrasonic motor comprises a signal generation module, a key control module, a power amplification module, a communication module, a grating ruler analysis module, a control algorithm, a data processing module, a power amplification circuit, a matching circuit and a voltage and current sampling circuit. The signal generation module outputs six paths of PWM waves with adjustable frequencies, phases and duty ratios, the control algorithm module performs adjustment through a control algorithm according to operation parameters of an ultrasonic motor fed back by a grating ruler, the key module is used for manual control, and the communication module is composed of USART logic and DMA logic. A control algorithm and data processing are generated by a single-chip microcomputer, detection and servo control are carried out through a communication USART module, and real-time monitoring, power amplification and matching are carried out on a serial port assistant of an upper computer, and a voltage and current sampling circuit drives and stabilizes operation of the ultrasonic motor. According to the invention, the amplitude modulation precision is below 4mv, and the stability is higher through a closed-loop control algorithm.

The present invention discloses a resistor voltage-bearing type on-state voltage drop measurement circuit for junction temperature monitoring and a monitoring method. The measurement circuit includes a high-resistance series high-voltage resistor RL, switching diodes D1 and D2, a low-voltage MOSFET M1, an inverter U1, a three-state gate U2, an RC delay circuit consisting of a resistor R1 and a capacitor C1, current-limiting resistors R2 and R3, auxiliary voltage sources VDD and VCC, an operational amplifier U3, and an isolation operational amplifier U4. and the monitoring method includes: designing an on-state voltage drop sampling circuit based on the high-resistance resistor and selecting parameters according to an actual application scenario; measuring a collector current and an on-state voltage drop model at different junction temperatures under an offline condition, and providing a calculation model for online monitoring; and performing online monitoring on the junction temperature.

The utility model discloses a flexible charging control system, and relates to the technical field of charging control. The flexible charging control system is arranged in a charging pile, and comprises a switch assembly which is connected between a power grid and a load to be charged and comprises a plurality of phase line change-over switches; the voltage sampling circuit is connected with the output end of the switch assembly and used for detecting the output voltage of the power grid; the controller is used for sending out a control signal of the phase line change-over switch; the logic self-locking circuit is used for outputting a charging control signal when it is detected that the power grid does not output voltage and it is detected that only one of the control signals, sent by the controller, of the phase line change-over switch is effective; and the switch driving circuit is used for controlling the phase line change-over switch to be closed when the control signal and the charging control signal of only one phase line change-over switch are received, so that only one phase line is connected with a load in the same charging period. According to the system, the safety and reliability of the charging control system can be effectively improved, and the complexity of system installation is reduced.

The invention provides a short circuit protection system and a bidirectional rail alternating current traction system. The short circuit protection system is coupled with a converter, and the converter is coupled with an alternating current bus through a switch; the short-circuit protection system comprises a sampling circuit, a processor and a short-circuit detection device. The sampling circuit is coupled with the direct current end of the converter and is configured to convert a first electric signal of the direct current end into a first voltage signal; the processor is configured to convert a second electric signal of the direct current end into a second voltage signal; the short-circuit detection device is coupled with the output end of the sampling circuit and the output end of the processor, and is configured to perform near-end short-circuit detection based on the first voltage signal and perform far-end short-circuit detection based on the second voltage signal; under the condition that near-end short circuit and / or far-end short circuit occurs, a short-circuit protection enable signal is output; the processor is further configured to respond to the short circuit protection enable signal, block the converter and turn off the switch.

The invention relates to a current-to-voltage acquisition circuit for suppressing common-mode interference. The current-to-voltage acquisition circuit comprises a current amplification module, a current transformer, a high-pass filter, an interference acquisition module, an interference analysis module and a suppression execution module, by means of the design, the common-mode interference suppression effect is better than that of a traditional sampling circuit, errors caused by sampling signal deviation generated by interference are avoided to the maximum degree, the common-mode interference suppression circuit is particularly suitable for interference scenes or occasions where interference sources change, the changed interference sources can be calculated in a sampling statistics mode, and the interference source suppression effect is improved. Therefore, the suppression ratio of common-mode suppression is adjusted, and the environment condition is dynamically tracked to obtain an accurate sampling effect.

The invention provides a detection circuit, a battery pack and a battery management system. The detection circuit is used for detecting a connection circuit of a first battery in a plurality of batteries connected in series. The detection circuit comprises a self-checking resistor; the equalization circuit comprises an equalization switch, and the equalization circuit is connected in series with the first battery through a self-check resistor; the filter circuit comprises a filter capacitor, and the filter circuit is connected with the equalization circuit in parallel; the sampling chip is connected with the two ends of the filter capacitor, the sampling chip, the filter circuit and the self-checking resistor jointly form a sampling circuit of the first battery, the sampling chip is used for determining whether the sampling circuit of the first battery fails or not according to a first voltage and a second voltage, the first voltage is the voltage on the filter capacitor when the equalization switch is switched off, and the second voltage is the voltage on the filter capacitor when the equalization switch is switched off; and the second voltage is the voltage on the filter capacitor when the equalization switch is closed. The detection circuit reduces the diagnosis cost and the overall size.

The invention discloses an electric orthogonal polarization synchronous control system of a geological microscope. The electric orthogonal polarization synchronous control system comprises six modules including a stokes parameter dynamic sensing unit based on multi-dimensional space vector transformation and a polarization mode dispersion feature extraction unit fusing adaptive weight distribution. The system captures original signals of polarized light through a high-frequency sampling circuit, generates corresponding compensation parameters according to actual parameters of the geological microscope through feature extraction and parameter calculation, generates driving signals in combination with dynamic threshold adjustment, drives an electric polarization component, and ensures control accuracy through closed-loop feedback adjustment. And each unit is also subdivided into functional subunits, such as mapping model updating, threshold acquisition and the like, so that self-adaptive optimization is realized. The multi-modal data interaction and cooperative control unit guarantees data interaction and overall cooperation of all the modules, the system solves the problems that traditional manual adjustment is low in efficiency and poor in precision, and an existing automatic system is insufficient in polarization mode dispersion processing, and the observation performance of the geological microscope is improved.

The invention discloses an inverter turn-off protection circuit, which comprises a bus voltage sampling circuit, a current sampling module, a multiplier, a threshold voltage comparison circuit and a gate turn-off circuit, and is characterized in that the bus voltage sampling circuit is used for sampling an inverter bus voltage to obtain a sampling voltage; the current sampling module is used for sampling phase current output by the alternating current side of the inverter to obtain sampling current; the multiplier is used for receiving the sampling voltage and the sampling current and carrying out multiplication operation to obtain instantaneous power; the threshold voltage comparison circuit is used for comparing the instantaneous power with a threshold to obtain a level signal; and the gate pole turn-off circuit is used for controlling the turn-off of a gate pole turn-off switch tube according to the level signal output by the threshold voltage comparison circuit so as to control the turn-off of a power tube of the inverter. The inverter turn-off protection circuit operates independently, is not affected by an MCU system, is low in cost and high in response speed, and greatly improves function safety.