122 results about "Hysteresis control" patented technology

The invention relates to a follow-up network type control smooth switching method based on a generalized operation short-circuit ratio index. The follow-up network type control smooth switching method comprises the following steps of 1, introducing a generalized operation short-circuit ratio (GOSCR) as a switching index, and proposing a GOSCR-based hysteresis control mode switching judgment index under different power grid strength and power output working conditions; step 2, establishing a unified new energy grid-connected control unit model: constructing a unified grid-connected control model in two modes of network following control and network construction control, systematically analyzing oscillation characteristics of a grid-connected unit in the two modes, and defining boundary conditions of mode switching; 3, proposing an LADRC-based undisturbed switching control strategy: observing and estimating system current disturbance parameters online by utilizing LESO, realizing real-time compensation of disturbance quantity, and reducing dynamic sudden change in the switching process; the method has the advantages that GOSCR switching indexes are introduced to comprehensively evaluate the strength, a unified grid-connected control model is established, and an undisturbed switching control strategy is provided.

The invention relates to a PFC-PWM (Pulse Width Modulation) dual-mode control method for a high-voltage direct-current power supply with a wide output voltage range. The output current of the high-voltage direct-current power supply is detected in real time, the critical threshold value of the load impedance is mapped into the hysteresis interval of the output current, the theoretical boundary of mode switching is obtained, and the control mode is dynamically adjusted. In order to further guarantee smooth switching of the two control modes, hysteresis control logic is designed, and undisturbed smooth switching of the PFM mode and the PWM mode is achieved. Based on an energy equivalence principle and a frequency consistency constraint of a critical load SWL working point, a current threshold criterion and a parameter pre-synchronization strategy are constructed, seamless connection of a mode switching process in a frequency domain and an energy domain is ensured, a transient oscillation risk is remarkably reduced, and a guarantee is provided for continuous and stable output of a full-range load working condition.

The invention discloses a micro-grid power control method, system and device based on fuzzy modulation and a storage medium, and relates to the technical field of intelligent grid integration of a photovoltaic system and a micro-grid, and the method comprises the steps: firstly obtaining the real-time power data of a photovoltaic system, carrying out the control processing through fuzzy logic, and calculating a reference instruction; according to the reference instruction, hysteresis time is dynamically adjusted through modulation hysteresis control, and an inverter switching signal is generated; converting direct current into alternating current based on the switching signal and a power switching device, injecting the alternating current into the micro-grid, calculating active and reactive power reference values, ensuring that the system operates according to a unit power factor, and giving active power to the reference value; according to the method, the power control precision and adaptability of the micro-grid are improved, excessive switching of the inverter is avoided, loss is reduced, the service life is prolonged, power matching and stable transmission are achieved, reactive loss is reduced, bus voltage is stabilized, harmonic waves can be reduced, the electric energy quality is improved, and efficient and stable operation of the micro-grid is guaranteed.

The invention relates to the field of locomotive power battery electric quantity control, and particularly discloses a locomotive power battery electric quantity hysteresis equalization control method, which comprises the following steps that: a traction force exerting mode is reset into an axle load transfer mode, and the initial value of an electric quantity equalization compensation coefficient K is a rack axle load transfer coefficient corresponding to zero speed; judging whether the current mode is a power battery power supply mode; if yes, the TCU receives the electric quantity of a front power battery and the electric quantity of a rear power battery in real time according to the current locomotive working mode, calculates the electric quantity average value difference value, monitors the auxiliary load power and the traction motor power and calculates the power difference value; entering a hysteresis control logic process; calculating a dynamic traction force compensation coefficient, ensuring that the traction force compensation amount is matched with the actual load characteristic of the system, correcting the traction characteristic curve in real time, and dynamically compensating the electric quantity difference of the battery; and performing traction distribution control according to the locomotive speed and outputting corresponding traction.

The invention provides a switched reluctance motor low-speed rotor position estimation method, and belongs to the technical field of switched reluctance motor control. The method comprises the following steps: firstly, discretizing a winding voltage equation of the switched reluctance motor, obtaining predicted current of each phase through programming calculation and formula recombination of a controller, and acting the predicted current on hysteresis control of a conduction region; secondly, in combination with a partition PWM hysteresis variable-duty-ratio pulse injection method, setting three high-frequency pulses with different duty ratios to be injected into a conduction region, a follow current region and a non-conduction region respectively, and increasing the number of sampling current slope difference values when a switch tube in the conduction region is switched off; and finally, performing logic combination and comparison on the three-phase current slope difference curve generated by calculation to obtain a real-time rotor position. According to the method, the rotor position estimation precision is improved, the rotating speed range is widened, the amplitude of response current in a non-conducting region is limited, negative torque is avoided, and low-speed stable operation of the motor is facilitated.

The embodiment of the invention provides a circuit protection device and a chip, and the device comprises a detection module which is used for detecting whether the voltage of a power supply exceeds a voltage protection threshold, and outputting a low-level signal to a time hysteresis control module when the voltage exceeds the voltage protection threshold; if not, a high-level signal is output to the time hysteresis control module; the time hysteresis control module is used for receiving the low-level signal output by the detection module and controlling an MOS tube in the time hysteresis control module to be turned off; and the control module is used for receiving the high-level signal output by the detection module, timing and controlling the MOS tube to start when the timing time reaches the preset time, so that the problem that the power supply end fluctuates between a protection mode and a normal working mode when the input power supply rapidly fluctuates in the overvoltage and power failure protection circuit in the related technology is solved. In addition, common simple devices are needed for implementation, the cost is low, and the reliability is high.

The invention provides a control method of a photovoltaic energy storage system, the photovoltaic energy storage system and a control circuit. The photovoltaic energy storage system comprises a power supply mechanism, a hybrid energy storage mechanism and a control module. The hybrid energy storage mechanism comprises a super capacitor module and an energy storage module; according to the control method, a hysteresis control threshold value is dynamically adjusted based on real-time state information of multiple dimensions; the method comprises the following steps: collecting power grid side data, photovoltaic side data and load side data in real time, and respectively calculating various different power gap parameters and state abrupt change parameters; when the state abrupt change parameter triggers a transient response strategy in the hybrid energy storage hierarchical control strategy, the super capacitor module is controlled to compensate preferentially; and triggering a steady state control strategy in the hybrid energy storage hierarchical control strategy to control an energy storage module and a super capacitor module to access the DC bus for compensation based on the dynamically adjusted hysteresis control threshold and the matching result of the various different power gap parameters, thereby reducing the state switching frequency of the photovoltaic energy storage system.

The invention relates to the technical field of electronic display, and discloses a liquid crystal display screen display control system based on multi-mode driving. The system comprises a content feature analysis module, a mode decision engine, a driving parameter library and a liquid crystal driving signal generation module. Multi-dimensional feature vectors are extracted through the content feature analysis module, a nonlinear decision mechanism combining fuzzy reasoning and hysteresis control is adopted, and single fixed threshold judgment in the prior art is thoroughly abandoned. The system can accurately capture dynamic characteristics of display content, effectively avoids the problem of mode oscillation in a threshold critical region, and realizes smooth and stable switching of driving modes. According to the invention, the hysteresis comparator and the continuous frame decision logic are introduced, so that the anti-interference capability and decision stability of the system are remarkably enhanced. The system does not trigger mode switching due to instantaneous noise or slight jitter of a single-frame image, so that the continuity of display experience is ensured, and extra power consumption caused by frequent switching is reduced.

The invention discloses a double-fed fan low voltage ride through cooperative control method based on power prediction, and belongs to the technical field of wind power generation. The method comprises the following steps: inputting data; performing power prediction based on a CNN-LSTM (Convolution and Long Short Term Memory Neural Network); converter capacity dynamic distribution calculation; the invention relates to an improved direct power control strategy design. According to the method, the CNN-LSTM power prediction model is introduced, so that the problems that traditional direct power control depends on real-time power feedback, a control instruction lags, and consequently, the voltage of a direct-current bus is unstable and reactive power support is delayed during low-voltage ride-through are solved. Through the predicted active power curve, the capacity distribution strategy of the converter is adjusted in advance, so that the reactive power support response is accelerated. Through the adaptive hysteresis control technology, the switching frequency is reduced in the low-voltage ride-through period to protect the device, so that the low-voltage ride-through operation capability of the doubly-fed fan is improved.

The invention relates to an elevator energy storage system control method, an elevator energy storage system and a storage medium, and is applied to the field of elevators, and the elevator energy storage system control method comprises the steps that a bus voltage signal of an elevator frequency converter is collected within a preset sampling period, and the bus voltage signal carries a plurality of bus sampling voltage values; and determining the fluctuation amplitude and the fluctuation frequency of the bus voltage signal fluctuation based on the plurality of bus sampling voltage values. According to the fluctuation amplitude and the fluctuation frequency, the charging and discharging process of the energy storage device to the elevator frequency converter bus is switched and controlled under a preset hysteresis control mechanism; according to the hysteresis control mechanism, a charging threshold value is set and used for controlling the energy storage device to be charged through an elevator frequency converter bus; and setting a discharge threshold value for controlling the energy storage device to discharge to the elevator frequency converter bus. By means of the elevator energy storage system, the problem that in the prior art, the system stability and the energy efficiency of the elevator energy storage system need to be improved in the charging and discharging process is solved.

The invention relates to a temperature control method and system for self-tuning PID parameters based on hysteresis control. The method comprises the following steps: initializing a temperature control system; designing a dynamic power adjustment strategy and carrying out oscillation test on the temperature control system by adopting a hysteresis control mode based on the strategy; carrying out preliminary self-tuning on parameters of the PID controller; designing a center point compensation mechanism; a dynamic power adjustment strategy and a center point compensation mechanism are combined, an improved PID control algorithm is executed to carry out real-time temperature control circulation, and the heating power is adjusted; and performing exception processing. Accurate adjustment is carried out by compensating the deviation between the temperature of the central point of the oscillation ring and the target temperature, the temperature deviation in traditional PID control is effectively eliminated, the debugging time and complexity are remarkably reduced, the system adaptability is enhanced, the response speed is increased, the problem that the control temperature is lower than the set temperature in the traditional PID control is effectively solved, and the control precision is improved.

The present invention belongs to the technical field of plasma sources, and provides a fuzzy hysteresis control method and circuit for a high-power and high-stability remote plasma source. When the reaction chamber is successfully ignited, the plasma source system is controlled to operate at a constant power output with a fixed frequency and variable duty cycle, including: respectively obtaining error control variables e and ec according to the sampled current value and duty cycle, and the predicted current value and duty cycle; using the error control variables e and ec as the input values of a fuzzy controller to obtain the actual control quantity hr output by the fuzzy controller; obtaining the compensation variables of current and duty cycle based on the error control variables e and ec; using the actual control quantity hr as the hysteresis width value of a hysteresis comparator, and compensating the current and duty cycle at the k-th moment with the output compensation variables according to a preset rule. The method provided by the present invention can ensure a relatively wide power window, improve the working stability of the remote plasma source, and enhance the uniformity of the semiconductor manufacturing process.

The present application relates to a kind of full digital hysteresis control method of inductance-free three-level inverter sampling time online prediction, belong to power electronic converter technical field, solve the dependence of full digital hysteresis control algorithm of three-level converter on high sampling rate, and the problem of being greatly influenced by main circuit filter parameter, it includes determining the mathematical model and modulation method of three-level converter, determining the full digital three-level hysteresis control algorithm of inductance-free sampling time online prediction, correction prediction sampling time interval.The full digital hysteresis control method is used for inductance-free three-level inverter hysteresis control simulation.

A device including an inverter circuit, a hysteresis control circuit, and a high-side input level shifter. The inverter circuit having an output and including at least two series connected PMOS transistors connected, at the output, in series to at least two series connected NMOS transistors. The hysteresis control circuit coupled to the output to provide feedback to the at least two series connected PMOS transistors and to the at least two series connected NMOS transistors. The high-side input level shifter connected to gates of the at least two PMOS transistors and configured to shift a low level of an input signal to a higher level and provide the higher level to one or more of the gates of the at least two PMOS transistors.

The invention discloses a current harmonic self-interleaving elimination control method and device for a common DC bus parallel grid-connected inverter, and the device comprises two same grid-connected inverter cabinets which are connected in parallel, and each parallel branch of the two grid-connected inverter cabinets is provided with a sensing filtering unit, a hysteresis comparison unit, and a PWM modulation unit. The method comprises the following steps of: simultaneously inputting the same current simulation given quantity into parallel branches respectively connected with two same grid-connected inverter cabinets which are connected in parallel, independently carrying out hysteresis control on each parallel branch, and finally driving the two grid-connected power cabinets to output current through sensing, filtering, hysteresis comparison and PWM (Pulse-Width Modulation) links, switching harmonics of output currents of the two grid-connected power cabinets are naturally distributed in a staggered mode due to the self-stabilization effect. The method does not depend on any synchronous or communication mechanism, and the current on the parallel branches of the two grid-connected inverter cabinets is automatically staggered and connected in parallel, so that the total harmonic distortion of the total grid-connected current is reduced, and the reliability is ensured while the system design is simplified.

The application provides a power battery heating noise processing method and device and an electric vehicle, and relates to the field of noise control.The application comprises the following steps: receiving a power battery heating instruction, and generating a d-axis current instruction and a q-axis current instruction according to the power battery heating instruction; outputting a q-axis voltage through a PI controller according to the q-axis current instruction, so as to control the q-axis current with an output value of zero; controlling a d-axis voltage to be output through hysteresis control according to the d-axis current instruction; generating a random factor at a preset frequency, adjusting the amplitude of the d-axis voltage according to the random factor, randomly adjusting the current slope of the motor at each pulse current point, generating a random pulse current acting on the power battery, and making the noise generated in the battery heating process randomly distributed, so as to solve the problem that the existing power battery heating process using high-frequency constant-frequency alternating current generates high-frequency sharp and piercing noise.

Disclosed Invention The present invention discloses a fault-tolerant control method for a three-phase open-winding motor based on active current injection. The control method is implemented through a drive system, and the drive system includes a DC voltage source, an inverter circuit, a permanent magnet synchronous motor, a drive circuit, a current sampling circuit, a speed sensor, and a central processing unit. In the control method of the present invention, the d-axis reference current #imgabs0# in the two-phase rotating coordinate system is given, and the q-axis reference current #imgabs1# in the two-phase rotating coordinate system is obtained by the given reference speed and the actual speed. The rotor position θ is measured; the reference values #imgabs2# and #imgabs3# of the three-phase current for current hysteresis control are calculated, and an injection current i obtained through calculation is injected through the three-phase current reference values inj to implement the corresponding fault-tolerant control strategy, which has low cost, high reliability, and is simple and easy to implement.

This invention relates to the fields of precision machining and intelligent manufacturing technology, and discloses a method for machining valve core holes in aerospace housing parts. This method employs an intelligent tool system integrated with a piezoelectric ceramic stack, which enables self-sensing monitoring and active vibration suppression closed-loop control of machining chatter. When the detected chatter amplitude exceeds an activation threshold, the system switches from monitoring to active vibration suppression, generating high-frequency vibrations by exciting the stack to suppress chatter, while simultaneously completing the finishing of the hole wall. When the chatter amplitude falls below a safety threshold, the system returns to monitoring mode. This invention solves the problems of system response lag and low integration by highly integrating sensing and execution functions into a single component; it improves machining efficiency and surface quality by merging cutting and finishing; and it ensures the stability of the machining process through dual-threshold hysteresis control.

The application discloses an adaptive start-stop control method for an energy storage side converter of a light storage system, and relates to the technical field of light storage system control. The method aims to solve the problems of large standby loss and shortened service life of an energy storage device caused by the continuous operation of an energy storage side converter for maintaining the voltage of a direct-current bus in a direct-current coupling type light storage system. The method is applied to a light storage system in which an energy storage device is connected to a direct-current bus through a converter. A multi-dimensional joint criterion including a direct-current bus voltage stability criterion, an energy storage state of charge (SOC) safety constraint criterion and an optional supplementary criterion is constructed. In combination with hysteresis control logic, the converter is turned off when all the criteria meet the steady-state condition, and the converter is started when any criterion does not meet the condition. The adaptive start-stop of the converter is realized, the stability of the system is ensured, the loss is reduced, and the service life of the energy storage device is prolonged.

A multi-stage vibration damping device having hysteresis control means is disclosed. The present invention provides a vibration damping device comprising: a first damping unit having a first input element, a first output element, and a first spring; a second damping unit having a second input element, a second output element, and a second spring, the second damping unit being arranged axially outwardly of the first damping unit; and a rotor unit having a rotor sleeve, the first input element being attached to the rotor sleeve radially outwardly of the first spring.

In some embodiments, a system includes: a power conversion system including: at least one driver operably coupled to at least one switch; a hysteresis control system; and driver control circuitry operably coupled to the at least one driver and the hysteresis control system, the driver control circuitry to: receive at least one driver control signal from the hysteresis control system, and control operation of the at least one driver based on the at least one driver control signal.

The application discloses a dynamic performance smoothing regulation method, system, medium and equipment for eMMC, relates to the technical field of embedded system storage management, and comprises the following steps: S1, real-time monitoring of the eMMC memory is carried out, the current storage filling rate F_fill of the eMMC memory is periodically acquired, then the environmental temperature T of the eMMC memory is acquired through a built-in temperature sensor, and finally the device life indication parameter L is acquired by querying from the eMMC memory; S2, the storage filling rate F_fill, the environmental temperature T and the device life indication parameter L acquired in the step S1 are input into a preset nonlinear frequency mapping model, and the target frequency is calculated; S3, based on the hysteresis control decision and the target frequency, the working clock frequency and mode of the eMMC memory are configured. The application has the characteristics of smoothness, the performance is smoothly attenuated with the increase of the filling rate, and step mutations do not occur; and the "ping-pong effect" is completely inhibited; the device life is effectively prolonged, and the application has the characteristics of high reliability.

The invention discloses a voltage comparator circuit, a chip and electronic equipment, and the voltage comparator circuit comprises a differential comparison circuit which is used for receiving an input voltage signal and a reference voltage signal, and outputting a differential signal based on the input voltage signal and the reference voltage signal; the output buffer circuit is connected with the differential comparison circuit and is used for outputting an output voltage signal of the voltage comparator circuit based on the differential signal; the hysteresis control circuit is connected with the output buffer circuit and the differential comparison circuit and is used for outputting an adjusting signal based on the output voltage signal so as to adjust the threshold voltage of the differential comparison circuit; and the clamping circuit is connected with the differential comparison circuit and is used for protecting the differential comparison circuit so as to prevent the differential comparison circuit from overvoltage breakdown. The voltage comparator circuit can bear dynamic high-voltage impact.

The invention provides a comparison circuit, a comparator and electrical equipment. A switch unit is arranged between a first signal input unit and a signal output unit and is used for adjusting the connection state between the first signal input unit and the signal output unit by changing the on-off state of the switch unit; when the switch unit is in an off state and the level of the second signal is greater than the level of the first preset signal, the switching unit switches the switch unit to an on state based on the control signal; when the switch unit is in the on state and the level of the second signal is smaller than the level of the second preset signal, the switching unit switches the switch unit to the off state based on the control signal; the level of the first preset signal is greater than that of the second preset signal; when the on-off state of the switch unit is switched, the second signal is firstly changed between the first preset signal and the second preset signal, and at the moment, the switch unit is still kept in the current on-off state, so that hysteresis control of output of the comparison circuit can be realized.

The invention discloses a self-adaptive ADB-bang-bang current sharing control method and system for multiple multi-phase buck-boost circuits connected in parallel, relates to the field of DC micro-grids, and solves the technical problem of circulating current caused by sampling deviation and inconsistent parameters when a plurality of DC-DC boost converters are connected in parallel. According to the invention, a PI controller with conditional integration is introduced into a voltage outer loop controller of each converter, so that the voltage error of each converter is obtained; a switching function is obtained, and when the switching function is not changed, integral and proportional links are normally carried out; when the function is switched on and off, the output of the integrator is reset, the integral link of each PI controller is automatically closed and reset, and the upper and lower limit thresholds of hysteresis control are changed on line in real time; the operation stability of the DC micro-grid can be improved.

Embodiments of the present invention disclose a current hysteresis control method, device, and electronic device for a permanent magnet synchronous motor. The method includes: determining a hysteresis output value of a predetermined axis based on a current parameter of the predetermined axis in a dq coordinate system; determining a predetermined axis voltage command to be output based on the hysteresis output value of the predetermined axis; wherein, when the hysteresis output value of the predetermined axis is 0 or 2, the predetermined axis voltage command is directly output according to a voltage command output strategy; and when the hysteresis output value of the predetermined axis is 1, the predetermined axis voltage command is calculated according to a voltage command output strategy and output. The present invention solves the technical problem in the related art of non-constant switching frequency and large steady-state current fluctuations in current hysteresis control of PMSMs. This achieves the technical effect of significantly reducing the steady-state current fluctuations of hysteresis control and maintaining a constant switching frequency without reducing dynamic response performance.

The present invention relates to the field of intelligent control and discloses a multi-parameter collaborative perception and resonant intelligent wake-up control method for refrigerators. The method comprises the following steps: dynamically acquiring temperature, humidity, and door status signals and adjusting their weights; extracting the resonant frequency offset in combination with the compressor vibration spectrum; performing intelligent wake-up and refrigeration duration prediction based on this feature; and introducing credibility assessment, a self-learning mapping model, and an interference filtering mechanism. Compared to traditional single-parameter or fixed-threshold control methods, this solution drives the control logic through changes in physical quantities. When triggered by a door status event, it forms a three-dimensional linkage relationship between environmental status, physical signals, and control decisions. This allows for timely perception and accurate response to changes in thermal characteristics within the refrigerator, overcoming the challenges of data fragmentation and hysteresis control.

The application provides a range extender control method based on battery temperature and pressure coupling, and belongs to the technical field of novel electric platform control. The method solves the problems of large battery SOC estimation error and inaccurate range extender control strategy under a large current working condition in the prior art. By collecting battery voltage, current, temperature and pressure information in real time, an initial SOC value is obtained based on ampere-hour integral method combined with voltage correction. A temperature-related battery parameter model is constructed to perform temperature compensation on the SOC. A correlation model between pressure and SOC is further established to perform secondary correction on the SOC. A battery multi-physical quantity coupling state evaluation model is constructed based on the final SOC estimation value, temperature, temperature change rate, pressure and pressure change rate. According to the evaluation result, a range extender layered control strategy is executed, including start-stop hysteresis control logic, power coordination control logic and safety protection control logic. Finally, the range extender start-stop state and output power are controlled to coordinate the energy distribution of the battery and the range extender. The application can significantly improve the battery SOC estimation accuracy under a large current working condition, optimize the range extender control strategy, and improve the battery pack safety and system stability.

The invention relates to the technical field of converters, and particularly provides a hysteresis-controlled bidirectional AC-DC converter and a control method thereof, and the method comprises the steps: obtaining a DC voltage and an AC voltage of the converter, and carrying out the calculation to obtain a minimum negative current; a pre-stage module controlled by hysteresis outputs a reference threshold value; inputting the alternating voltage of the converter into a logic driving module to obtain a first driving signal and a polarity logic control signal of the power frequency switch tube, and controlling the on-off of the corresponding power frequency switch tube through the first driving signal; and according to the polarity logic control signal, comparing a reference threshold value with the inductive current of the converter by using a rapid comparison module, determining a second driving signal of the high-frequency switch tube, and controlling the voltage of the corresponding high-frequency switch tube to be turned on after returning to zero, so as to solve the problem that in the related technology, the converter is in bidirectional energy interaction. And a high-frequency switching tube of the converter carries out high-frequency switching when the voltage is not zero, so that voltage and current peaks and high loss are caused.

The utility model relates to the field of medicine processing equipment, in particular to an automatic temperature control device for a precipitate preparation tank, which comprises a return difference control temperature controller for setting a heating temperature and a return difference value and outputting a control signal; the temperature sensing probe is arranged in the circulating pipeline and is used for detecting the heating temperature of the liquid medicine and outputting a detected temperature signal to the return difference control temperature controller; the circulating pump is arranged on the circulating pipeline and is used for driving the liquid medicine to circularly flow; and the control valve is arranged on the heating pipeline and is used for controlling the on-off of the heating pipeline and receiving a control signal of the return difference control temperature controller so as to realize opening or closing. A return difference control mode is adopted, and a specific heating temperature and a return difference value can be set, so that the system is not immediately turned off when the liquid medicine temperature reaches a set value, but is restarted when the temperature is reduced to be below the return difference value, and the heating equipment is prevented from being frequently turned on and turned off.