107results about How to "Avoid oscillation" patented technology

The invention relates to the technical field of heat dissipation control, and discloses a heat dissipation fan multi-order filtering control method and device, and the method comprises the steps: collecting the operation parameters of a multi-fan heat dissipation system, and carrying out the construction of a dynamic state space model, and obtaining a system operation state equation and a temperature observation equation; inputting the system operation state equation and the temperature observation equation into an expectation maximization sliding window iteration extended Kalman filter to obtain a system state estimation value and a prediction error covariance matrix; performing three-stage series design on the cut-off frequency of the low-pass filter, the passband range of the band-pass filter and the coefficient of the adaptive filter to obtain a system multi-order filtering control model; based on a system multi-order filtering control model, an airflow coupling influence coefficient matrix among multiple fans is calculated, the total energy consumption, the noise level and the heat dissipation efficiency are subjected to optimization solution, a fan control optimization parameter set is obtained, the heat dissipation efficiency is guaranteed while the energy consumption is reduced, and dynamic balance among all control units is achieved.

The invention provides a coordination control method and device for off-grid new energy hydrogen production, electronic equipment and a medium, and relates to the technical field of new energy hydrogen production. The coordination control method for off-grid new energy hydrogen production comprises the following steps: performing first coordination control on off-grid new energy hydrogen production based on a steady-state control mode under the condition that the actually measured current frequency of a system is within an adjustment dead zone range; under the condition that the current frequency of the system is not in the adjustment dead zone range, performing second coordination control based on the transient state control mode; after the second coordination control, under the condition that the current frequency of the system is not in the adjustment dead zone range, third coordination control is carried out on off-network new energy hydrogen production based on the emergency control mode; and after the third coordination control, under the condition that the current frequency of the system is not in the adjustment dead zone range, determining a to-be-cut power value of off-grid new energy hydrogen production according to an overcut principle. According to the method, the load adjusting characteristic of the hydrogen production electrolytic cell is considered, source-load interaction is achieved, and the absorption rate of new energy is increased.

The invention belongs to the field of grid-connected converter control methods, and discloses a torque quantization-based low-frequency oscillation suppression method for a direct-current voltage synchronous inverter, which constructs a grid-connected damping torque model of the inverter, quantifies a damping torque and a synchronous torque of a system and describes oscillation characteristics of the system. When oscillation is unstable and damping or synchronous torque is a negative value, the provided compensation torque stabilizer is introduced through angular frequency deviation, a lag phase of the system at the oscillation frequency is compensated by using a lead-lag corrector, and then the compensation torque stabilizer is fed back to an active power reference value. By designing the compensation torque, it is ensured that the synchronous torque and the damping torque of the system are positive values all the time, and oscillation instability is effectively restrained. The method is suitable for a small-disturbance working condition, the steady-state characteristic of inverter operation is not changed, the grid-connected stability of the grid-forming type photovoltaic inverter is improved, and meanwhile scheduling optimization and energy efficiency evaluation of the system are not affected.

The invention discloses a string type network energy storage converter control method, and the method comprises the steps: enabling an energy storage converter to take an SOC mean value as the feedback of an SOC equalization ring, and obtaining an SOC equalization ring output value; superposing the output value of the secondary frequency modulation ring, the output value of the SOC equalization ring and the output value of the primary frequency modulation ring as an active given value, and obtaining a reference value of the frequency through a VSG active frequency control ring; taking the output value of the secondary voltage regulating ring as a reactive given value, obtaining a reference value of a VSG reactive amplitude control ring through the primary voltage regulating ring, and obtaining a reference value of voltage through the amplitude control ring; inputting the obtained reference value of the frequency and the reference value of the voltage into a voltage and current double closed loop to obtain an output signal for following the reference values, and further generating a driving signal for controlling a switching tube of the energy storage converter; according to the invention, the communication load rate can be reduced, when large frequency and voltage fluctuation occurs, the voltage and frequency stability problem can be independently solved, the self-recovery control of secondary regulation is realized, and the frequency and the output voltage of the system are dynamically regulated in real time.

The invention relates to the technical field of image recognition, in particular to an intelligent safety helmet construction environment detection method and system based on image recognition, and the method comprises the steps: obtaining the image data of a construction environment; preprocessing the acquired image data, including denoising the construction image and enhancing the denoised image data; the preprocessed image is used as input to construct a prediction model, and an attention mechanism is introduced for the prediction model; the method comprises the steps of constructing a prediction model based on a convolutional neural network, a recurrent neural network and a generative adversarial network, performing model training according to the constructed prediction model, performing feature extraction based on the trained prediction model, and performing judgment of a danger threshold according to output image features, and can fully utilize the advantages of different networks by constructing the prediction model based on the convolutional neural network, the recurrent neural network and the generative adversarial network. Therefore, the judgment on dangerous conditions is improved.

The invention provides a pressure test control method and system for a universal pressure testing machine, and relates to the technical field of material testing machines, and the method comprises the steps: obtaining hydraulic cylinder parameters and servo valve parameters, building a pressure control mathematical model, calculating a transfer function, initializing a feedback controller, determining the number of hidden layer nodes, and setting an activation function and a network weight. A self-adaptive feedback controller is obtained; generating a closed-loop control system, constructing an objective function based on an integral absolute error and adjustment time, determining a Pareto optimal solution set in combination with a multi-objective genetic algorithm, selecting a neural network training sample, generating a training sample set, performing offline pre-training, and updating a network weight to obtain a pre-trained neural network; and the feedback controller is embedded into a pressure control system, outputs feedback controller parameters, sets an anti-saturation strategy of the feedback controller, judges whether the feedback controller is saturated or not, limits the amplitude of an integral item according to the relation between an error signal and a saturation direction, determines whether to stop integration or not, and generates a press control strategy under the current working condition.

The invention relates to the technical field of motor control and parameter identification, and discloses a permanent magnet synchronous motor parameter identification method based on a self-adaptive forgetting factor, which comprises the following steps of: acquiring an input signal and an output signal of a permanent magnet synchronous motor in real time, and constructing a regression vector by using the acquired input signal and output signal; calculating the information entropy of the current moment according to the constructed regression vector; performing normalization processing on the information entropy, and calculating a forgetting factor at the current moment according to the normalized information entropy; and substituting the forgetting factor into a parameter updating formula of a recursive least square method for parameter identification. According to the method disclosed by the invention, the adaptive capacity to dynamic change of motor parameters can be improved, the interference of noise on identification precision is effectively suppressed, the credibility of an identification result is improved, and the robustness and long-term stability of a control system are ensured.

The invention discloses a grid-connected inverter control method and system for a triangular hysteresis primary frequency modulation dead zone. Dead zone boundary frequency change values-fdbINV and fdbINV are set; setting a hysteresis boundary frequency change value-fhdbINV and a hysteresis boundary frequency change value-fhdbINV; calculating a droop curve slope kHDINV in a hysteresis loop based on the dead zone boundary frequency change value-fdbINV, the fdbINV and the hysteresis loop boundary frequency change value-fhdbINV; sampling the frequency fg of the power grid system; calculating a difference value delta f between the power grid system frequency fg and the power grid system rated frequency fn; and performing differential processing on the difference value delta f to obtain # imgabs0 #, and determining the power variation of the inverter and the new energy field station participating in primary frequency modulation according to the difference value delta f and # imgabs1 #, thereby realizing the adjustment of the power grid frequency, reducing the steady-state frequency deviation, and simultaneously preventing the oscillation among different control schemes near a dead zone boundary and a hysteresis boundary.

The utility model discloses an automobile luggage rack expansion support which comprises a luggage rack, a mounting frame, connecting frames and a telescopic frame, the mounting frame is fixedly connected to the top of the luggage rack, the connecting frames are fixedly connected to the two sides of the mounting frame, the telescopic frame is movably connected to the inner wall of the mounting frame, mounting plates are arranged on the two sides of the bottom of the luggage rack, and the mounting plates are fixedly connected to the inner wall of the mounting frame. A mounting groove is formed in the top of the mounting plate, and a damping spring is arranged on the inner wall of the mounting groove. By arranging the damping spring, the mounting plate, the damper, the dismounting and mounting assembly and the cleaning assembly, the damping spring and the damper can be effectively matched for use, the damping spring absorbs impact of the luggage rack and stores energy, and the problems that the device is not provided with a damping structure, and when luggage is supported and fixed through the luggage rack, the damping structure is damaged are solved. The problems that the luggage rack shakes along with a running vehicle when the running vehicle passes through a bumpy road section, so that articles on the luggage rack are damaged due to bumping, and the loading safety is influenced are solved.

The invention relates to a smelting furnace intelligent control system and method, and belongs to the technical field of smelting furnace intelligent control, the system comprises a data acquisition module, an automatic control module, a man-machine interaction module and a data storage module, and the data acquisition module, the automatic control module, the man-machine interaction module and the data storage module are in communication connection in sequence; the automatic control module is used for automatically adjusting working parameters of the smelting furnace according to a control decision through the collected real-time data and issuing a control instruction to control fuel supply and cooling water flow; the data acquisition module is used for acquiring real-time data through sensor equipment and performing primary processing on the data; and the data storage module is used for storing the collected real-time data and classifying the data according to the established different operation condition types. Accurate automatic control is achieved through the control decision, optimization of the smelting process is achieved, meanwhile, the fuel supply amount and the cooling water flow are obtained through the multi-target optimization algorithm, working parameters are adjusted in real time, and energy use is reduced.

The invention discloses an autonomous vehicle queue cooperative control method and device, the distance and speed between vehicles are ensured to be accurately controlled through a longitudinal control strategy, the safe distance can be maintained, the change of traffic flow can be adapted, the fluency and safety of a vehicle queue are improved, a transverse control strategy is responsible for lane keeping, steering and lane changing of the vehicles, and the vehicle queue cooperative control method and device are provided. By accurately controlling the transverse position and the steering angle of the vehicle, it is ensured that the vehicle stably runs in a lane, meanwhile, the lane changing operation can be safely and efficiently completed, the sharp turning and obstacle avoidance cooperative safety control strategy enables a motorcade to rapidly make adjustments when facing a complex scene, sharp turning and obstacle avoidance actions of the vehicle are achieved through cooperative control, and the driving safety of the vehicle is improved. According to the method, collision is avoided, driving safety is kept, information sharing and action coordination between vehicles are achieved through cooperative control of the motorcade, and the safety and stability of the motorcade are further improved.

The invention discloses a VSG self-adaption control method under unbalanced power grid voltage. The method comprises the steps that inertia and damping are introduced into a VSG-based inverter control model; determining the relationship between the instantaneous change rate of the electrical angular frequency, the variable quantity of the electrical angular frequency, the inertia and the damping by combining an active power-frequency control equation; determining a steady-state inertia coefficient and a damping coefficient according to the engineering optimization parameters and the variation range of the oscillation angular frequency, and determining the variation range of the inertia coefficient and the variation range of the damping coefficient; determining a self-adaptive control method of an inertia coefficient and a damping coefficient according to the electrical angular frequency variation and the electrical angular frequency instantaneous change rate of different stages; in combination with balanced current control, active power constant control and reactive power constant control under unbalanced network voltage, three-phase balance of output current is realized, and fluctuation of active power or reactive power is suppressed. According to the invention, the influence of unbalanced power grid voltage is reduced, and the transient stability of VSG control is improved through adaptive parameter adjustment.

The invention discloses a current control method for a permanent magnet synchronous motor at a high speed and a low carrier wave ratio, and aims to solve the problem that the current instruction tracking performance of a discrete time domain complex vector current controller at the high speed and the low carrier wave ratio is reduced due to insufficient damping of the discrete time domain complex vector current controller. Therefore, the damping ratio of the control system is improved, the influence of disturbance voltage caused by parameter change, back electromotive force change and nonlinearity of the inverter on current instruction tracking can be suppressed, and meanwhile, the problem of current coupling caused by inductance change is avoided; current overshoot can be reduced and current fluctuation caused by interference voltage can be suppressed under the condition that electrical parameters change or are uncertain.

The present invention provides a method and device for starting an engine in a dual-motor hybrid power system and a vehicle, belonging to the field of vehicle technology. The dual-motor hybrid power system includes an engine, a first motor connected to the engine, and a clutch connected between the first motor and a transmission system. The starting method includes: upon receiving an engine start request, obtaining the current state of the first motor; if the current state of the first motor is a fault, obtaining the current state data of the vehicle, the current state data of the vehicle including the current speed of the vehicle; determining whether the current speed of the vehicle is less than or equal to a preset speed threshold and whether other current state data of the vehicle meets the conditions for waiting for the clutch to start; if so, monitoring the speed of the vehicle in real time until the speed of the vehicle is greater than the preset speed threshold to control the clutch to drag the engine to start. The present invention can improve the NVH performance and stability of the vehicle when the engine is started.

This application discloses a health management and resource optimization configuration method for a distributed power supply in a test cabinet. The method includes: collecting electrical and temperature parameters of multiple sub-modules of the power supply during operation; extracting feature vectors representing the degradation state of the power supply based on a sliding time window; obtaining health information of multiple sub-modules; adaptively adjusting the reporting strategy of health information; and outputting power control commands for at least one sub-module. When a sub-module's health risk indicator is detected to exceed a preset risk threshold, the sub-module is marked as a risk sub-module, and at least one type of migrateable load is migrated from the risk sub-module to a candidate sub-module. Output channel isolation control is performed on the risk sub-module, and the power supply path used for status detection is retained. The display priority of multiple sub-modules is calculated, sorted and displayed according to the display priority, and multi-level alarm prompts corresponding to the health risk indicators are triggered simultaneously.

The application belongs to the technical field of power management and battery power supply system, and specifically relates to an intelligent charging and discharging system with main and standby power supply switching and double-way output, which comprises an external power input module, a charging management module and an external power output module; the external power input module is used for connecting an external 5V power supply and comprises an anti-reverse connection / anti-backfill unit and an input filter unit; the charging management module is connected with the external power input module, is used for performing constant current / constant voltage charging on a single lithium battery, and provides a charging state indication output and a temperature detection input; through the cooperative design of external power effective determination, external power priority strategy and output retention capacitor / filtering, repeated switching caused by plug-in transient is inhibited, so that the drop and jitter of the system main power bus are reduced; the system main power bus does not have repeated jitter switching or the drop duration is significantly shortened when the external 5V is plugged in according to the engineering test caliber.

The present invention discloses a method for suppressing motor oscillation of an asynchronous motor VF control, comprising the following steps: a frequency converter samples three-phase output current, obtains instantaneous reactive current of the asynchronous motor, extracts reactive current oscillation components, outputs an oscillation suppression calculation angle, and then outputs an oscillation suppression adjustment angle; at the same time, the frequency converter samples bus voltage, obtains bus voltage variation, and then outputs an oscillation suppression adjustment voltage; finally, the oscillation suppression adjustment angle and the frequency instruction are calculated by a second angle integrator to obtain an angle, and the oscillation suppression adjustment voltage and the frequency instruction are calculated by a VF curve calculation unit to obtain an output voltage, which is used for SVPWM modulation output. The present invention simultaneously detects the output current and bus voltage, adds an adjustment angle output controller and a universal adjustment unit, effectively speeds up the control response, realizes the optimal control adjustment output, and has an obvious suppression effect, which can meet the needs of parameter consistency for asynchronous motors of different capacities.

This application relates to the field of industrial furnace temperature control technology, and discloses an energy-saving brazing furnace heating process temperature adaptive control method and system. The heating process of the brazing furnace is divided into at least three continuous temperature ranges, including a first temperature range, a second temperature range, and a transition temperature range. A first power control strategy and a first temperature fluctuation tolerance are configured for the first temperature range, and a second power control strategy and a second temperature fluctuation tolerance are configured for the second temperature range. The current temperature range of the brazing furnace is determined based on the current temperature. When it is determined that the brazing furnace is currently in the first temperature range, the first power control strategy is executed to output heating power, ensuring that the characteristic temperature is within the first temperature fluctuation tolerance. When it is determined that the brazing furnace is currently in the second temperature range, the second power control strategy is executed to output heating power, ensuring that the characteristic temperature is within the second temperature fluctuation tolerance. When it is determined that the brazing furnace is currently in the transition temperature range, a smooth switching logic is executed.

The invention provides a broadband gain positive slope amplitude-phase control multifunctional chip for a T / R assembly, which relates to the technical field of radio frequency integrated circuits and comprises a receiving channel, a transmitting channel, an equalization circuit, a numerical control attenuator, a numerical control phase shifter, a transmitting-receiving change-over switch module and a parallel control module. The parallel control module is used for outputting parallel control signals to the numerical control attenuator, the numerical control phase shifter and the transceiving change-over switch module; the equalization circuit is respectively connected with the receiving channel and the transmitting channel through the transmitting-receiving change-over switch module, so that a signal path of the receiving channel and a signal path of the transmitting channel multiplex the equalization circuit, the numerical control attenuator and the numerical control phase shifter; and the equalization circuit is of an on-chip integrated structure and is used for adjusting the gain of the receiving channel and the gain of the transmitting channel to present a positive slope characteristic relative to the frequency in a wide frequency band so as to compensate the frequency attenuation of an external device.

The invention discloses a knowledge index and text generation control method and system for retrieval enhancement generation. The method relates to the technical field of retrieval enhancement generation and comprises the following steps of knowledge index accuracy evaluation, index accuracy intelligent regulation and control, text generation timeliness evaluation and generation timeliness intelligent regulation and control. According to the method, the knowledge index accuracy is evaluated based on the index accurate parameters, and if the knowledge index does not reach the standard, the semantic relevance and the result effectiveness are regulated and optimized in a self-adaptive mode through the window width and the effective proportion. And then, evaluating the text generation timeliness based on generation timeliness parameters, if the text generation timeliness does not reach the standard, dynamically managing dialogue memory and load by updating a rate threshold value and performing adaptive regulation and control of a response period, preferentially guaranteeing the response speed and continuity, and finally performing a text generation verification link. The control timeliness of the knowledge index generated by retrieval enhancement and the text generation is improved, and the problem that the control timeliness of the knowledge index generated by retrieval enhancement and the text generation is low in the prior art is solved.

The application provides a kind of adaptive virtual impedance low voltage ride-through method suitable for hydrogen fuel cell system, it is related to hydrogen fuel cell power generation control technical field.The application obtains the current tolerance and reactive power support boundary in future time window accurately by using dynamic capability prediction model after triggering low voltage ride-through mode by real-time monitoring grid-connected point voltage and fuel cell body state, provides accurate constraint for adaptive adjustment of virtual impedance.Based on this boundary and voltage drop characteristics, a multi-objective optimization model is constructed, and the optimal virtual impedance value and power command change trend are obtained by solving, overcoming the mismatch problem of fixed virtual impedance.Further combined with the dynamic adjustment of converter and fuel cell controller, the virtual impedance can track the system operating condition changes in real time, while considering the reactive power support demand to suppress fault current impact and avoid oscillation or off-grid.The application improves the ride-through success rate and operation stability of hydrogen fuel cell power generation system under low voltage fault.

The utility model discloses an anti -oscillation circuit and power supply thereof. The anti -oscillation circuit includes voltage dividing unit, temperature response unit and voltage regulation unit, voltage dividing unit is connected with the input of power module and voltage regulation unit, is used for dividing voltage of power module input voltage according to the preconcerted ratio, provides voltage dividing voltage for voltage regulation unit, temperature response unit is connected with the input of power module and voltage regulation unit, is used for providing bias voltage for voltage regulation unit, and adjusts bias voltage according to environmental temperature change, voltage regulation unit still is connected with the enable end of power module, is used for adjusting own on -resistance according to bias voltage, thereby adjusts the voltage of power module enable end. The utility model embodiment can automatically compensate the temperature drift of power module enable threshold under different temperature environment, effectively prevents the power module from generating oscillation near the under -voltage point, improves the working stability and reliability of power module under extreme temperature environment.

The application discloses a porcelain insulator ultrasonic detection robot signal compensation system and method suitable for long-distance cable transmission, relates to the technical field of robot ultrasonic nondestructive testing, and mainly comprises the following steps: calculating a compensation coefficient according to a reference echo signal, a reverse echo signal and a key feature, compensating a measured echo signal, correcting an original standard distance-amplitude curve, compensating an initial wave amplitude, coupling and judging a compensated initial wave amplitude by using a lag comparator, denoising a processed echo signal, calculating a detection confidence degree, comparing a peak value of the denoised echo signal containing a defect with the corrected distance-amplitude curve to obtain a comparison result, and making a hierarchical decision according to the detection confidence degree. The porcelain insulator ultrasonic detection robot signal compensation system and method suitable for long-distance cable transmission can improve the consistency of multi-length cable judgment and the detection reliability.

The application provides a unilateral detection system and a vehicle. The unilateral detection system comprises a voltage dividing circuit, an amplification circuit, an isolation circuit, an output circuit and a controller. The voltage dividing circuit divides the voltage of a high-voltage DC bus to obtain a first output voltage. The amplification circuit is connected with the voltage dividing circuit. The isolation circuit is connected with the amplification circuit and the voltage dividing circuit. The output circuit comprises a first operational amplifier and a first resistor. The non-inverting input terminal of the first operational amplifier and one end of the first resistor are connected with the sixth terminal of the isolation circuit. The inverting input terminal of the first operational amplifier is connected with the output terminal of the first operational amplifier. The other end of the first resistor is grounded. The first operational amplifier generates a second output voltage. The controller determines the voltage of the high-voltage DC bus based on the second output voltage. The system can monitor the voltage of the high-voltage DC bus in isolation, so as to discover abnormal conditions of the voltage in time. The system has high safety in use due to the isolation circuit.

The invention discloses a digital control method for a split-phase voltage-regulating voltage stabilizer based on silicon controlled gear switching, and relates to the technical field of voltage-regulating voltage stabilizer control. The method comprises the following steps: executing closed-loop control in each power supply cycle in a gear switching transition period: pre-judging a circulation increment according to initial trigger angles of a new gear and an old gear, and comparing the circulation increment with a safety threshold; if the threshold is exceeded, calculating a critical overlapping starting angle, segmenting an overlapping conduction interval by taking the critical overlapping starting angle as an anchor point, calculating a residual ratio, and selecting a segmentation correction strategy to correct the initial trigger angle; calculating an effective energy transmission proportion reflecting an actual transition progress based on the corrected trigger angle, and adaptively generating a target weight of a next power cycle based on the effective energy transmission proportion; monotonicity and saturation constraints are applied to the target weight to obtain an execution weight, the execution weight is mapped into an initial trigger angle of a next power supply cycle, and a cycle-by-cycle closed loop is formed; and when the execution weight reaches a final value, executing steady state locking to complete switching. The circulating current is safe and controllable, and the transition process is smooth and free of impact.

The application provides a differential detection system of a high-voltage direct-current bus and a vehicle, the system comprising a differential sampling circuit, a first operational amplifier, an isolation circuit and a signal processing circuit; the differential sampling circuit is connected with a positive electrode and a negative electrode of the high-voltage direct-current bus and grounded; the inverting input end of the first operational amplifier is connected with the differential sampling circuit and the output end of the first operational amplifier, and the non-inverting input end of the first operational amplifier is connected with the negative electrode of the high-voltage direct-current bus and the common ground of the differential sampling circuit; the isolation circuit is connected with the first operational amplifier and the differential sampling circuit, and is connected with a power supply voltage and grounded; the signal processing circuit is connected with the isolation circuit, and the signal processing circuit determines the voltage of the high-voltage direct-current bus based on the output current of the isolation circuit. The system performs double-end sampling on the voltage of the high-voltage direct-current bus through differential sampling, has high sampling accuracy, high anti-interference ability, and is provided with the isolation circuit, and thus has high overall use safety.

This invention relates to the field of network routing optimization technology, specifically to a network path optimization method, apparatus, electronic device, and storage medium. In this invention, by synchronously monitoring bit rate and packet rate load, and using the higher of their utilization rates as the criterion for link congestion judgment, the limitations of traditional single-indicator evaluation are effectively overcome, enabling cost calculation to more comprehensively and accurately reflect real-time link congestion risk. Through a cost coefficient mapping mechanism, and combined with a baseline link cost to determine dynamic link costs, real-time and accurate input is provided to the path optimization algorithm, resulting in significant optimization of the overall network in terms of throughput and transmission latency. This is particularly suitable for high-reliability industrial scenarios sensitive to jitter.

The invention relates to an impedance matching circuit, a related circuit and a circuit system. The impedance matching circuit is connected between a signal source circuit and a surface acoustic wave chip, and comprises an MCU controller, a temperature measurement circuit and an impedance matching network, the impedance matching network comprises a matching inductor combination and a matching capacitor combination, the matching inductor combination comprises a plurality of matching inductors which are connected in series and have different inductance values, and an inductor switch which is connected in parallel to each matching inductor; the matching inductor combination comprises a plurality of matching capacitors which are connected in parallel and have different capacitance values, and a capacitor switch which is connected in series with each matching capacitor; the temperature measuring circuit is connected with the MCU controller and is used for measuring temperature data of the surface acoustic wave chip in real time and sending the temperature data to the MCU controller; and the MCU controller is connected with each inductance switch and each capacitance switch and is used for outputting a control signal according to the received temperature data so as to control the corresponding inductance switches and capacitance switches to be switched off or switched on.

The application discloses an output self-correction circuit for a medical electron gun grid power supply, comprising a low-voltage side control unit, an isolation transmission unit, a high-voltage side control unit, a grid power supply and an independent sampling network; the low-voltage side control unit receives a dose rate, an ambient temperature, an external sampling signal and an output voltage feedback signal, generates a corrected reference signal and transmits the corrected reference signal to the high-voltage side control unit through the isolation transmission unit; the high-voltage side control unit outputs a control increment to the grid power supply after F / V conversion of the corrected reference signal, simultaneously receives voltage feedback signals of the grid power supply and the independent sampling network, and transmits the voltage feedback signals to the low-voltage side control unit through the isolation transmission unit; the application provides the grid power supply with output self-correction for a medical electron linear accelerator, realizes long-term stability and parameter consistency of an electron gun emission beam current, does not need manual correction, and greatly improves work efficiency.

The application discloses a method and device for suppressing wide-frequency oscillation of a converter, equipment and a medium, and belongs to the field of power grid safety. The method is as follows: obtaining the fundamental equivalent impedance of the converter corresponding to the fundamental frequency and the wide-frequency equivalent impedance corresponding to each interference frequency through a preset interference signal; judging the damping characteristic of the converter according to the real part of the fundamental equivalent impedance; if the damping characteristic is positive, and the imaginary part of at least one wide-frequency equivalent impedance satisfies a preset resonance criterion, determining a resonance frequency band from all interference frequencies, and adjusting the current control loop parameters of the converter according to the resonance frequency band until all imaginary parts do not satisfy the preset resonance criterion, so as to realize wide-frequency oscillation suppression; wherein, the preset resonance criterion is determined according to the reactance characteristic of the wide-frequency equivalent impedance. The application can improve the accuracy of wide-frequency oscillation suppression of the converter.