15results about How to "Small voltage fluctuation" patented technology

The invention relates to a DC-DC converter control method based on an intelligent agent reinforcement learning algorithm, and the method comprises the steps: firstly building an intelligent agent for a DC-DC buck converter which supplies power to a constant-power load, obtaining a state observation quantity formed by all preset environment variable values of the DC-DC buck converter through the intelligent agent, and obtaining the state observation quantity of the DC-DC buck converter; and a reward value corresponding to a difference value between the output voltage and a preset reference voltage is processed by the intelligent agent, and a corresponding action signal is output and used for controlling the DC-DC buck converter. And then through reinforcement learning training of the intelligent agent, the trained model controls the DC-DC buck converter, so that the output voltage of the DC-DC buck converter has good adaptivity and dynamic response characteristics under different working conditions, and the designed intelligent agent has good steady-state performance in application, so that the stability of the DC-DC buck converter is improved. Model parameter uncertainty caused by component aging can be dealt with, and the stability in practical application is ensured.

This application provides an adaptive control method and system for a lead-acid battery charge-discharge switching circuit, relating to the field of adaptive control technology. The method determines the pre-trigger time for charge-discharge switching by measuring the duration of the mains input voltage exceeding the limit between adjacent power frequency cycles; determines the amount of stored charge in the bus capacitor before switching; and determines the power step that the discharge branch needs to bear at the moment of switching, further determining the conduction sequence of the power switching devices in the discharge branch, and causing the discharge branch to gradually accept load current according to the conduction sequence. The method controls the release of stored charge from the bus capacitor to the bus side and performs damping compensation for the transient voltage drop on the bus generated during the discharge branch's acceptance of load current, obtaining a damped recovery trajectory for the bus voltage. The bus voltage is then restored to the steady-state voltage level through the damped recovery trajectory, entering steady-state discharge control. This application can achieve dynamic and stable bus control during charge-discharge switching, thereby reducing bus voltage fluctuations at the moment of switching.

The invention relates to an energy management method and system suitable for an electric vehicle charging station. The method comprises the steps that related electrical parameters of the charging station and energy management data of the charging station are acquired; establishing an energy management learning network of the charging station; training the energy management learning network to obtain a well trained energy management learning network; and the energy of the charging station is managed through the well-trained energy management learning network. According to the invention, multi-parameter collaborative accurate scheduling is realized, the operation cost of the charging station can be reduced, the voltage fluctuation of the DC bus is controlled, the SOC value of the super energy storage system is maintained in the optimal interval, the energy utilization efficiency and the stability of the power distribution network are improved, and the large-scale and intelligent operation requirements of the charging station are met.

The utility model relates to a reading auxiliary circuit, a memory and electronic equipment, the reading auxiliary circuit comprises a voltage gate, the input end of the voltage gate is connected with a first driving signal, and the output end of the voltage gate is used for providing different driving voltages for a bit line and a reverse bit line connected with a sensitive amplifier; a first switching unit; the second switch unit is connected with the first switch unit; the first input end of the driver is connected with the output end of the voltage gate through a first switch unit, and the second input end of the driver is connected with the output end of the voltage gate through a second switch unit; wherein the first switch unit is used for transmitting a driving voltage on a bit line to a first input end of the driver when receiving a second driving signal; and the second switch unit is used for transmitting the driving voltage on the reverse bit line to the second input end of the driver when receiving a third driving signal. And the BL-BLB voltage difference delta V is improved through a scheme of pulling the high-bit line voltage, so that the accuracy and the stability during reading are ensured.

The utility model relates to a super capacitor discharge circuit and device for a non-discharge control acquisition terminal, which comprises a reference voltage generation circuit, a triangular wave generation circuit, a PWM (Pulse Width Modulation) generation circuit and an adjustable voltage generation circuit, and the output ends of the reference voltage generation circuit and the triangular wave generation circuit are connected with the input end of the PWM generation circuit. The output end of the PWM generation circuit is connected with the input end of the adjustable voltage generation circuit; and the adjustable voltage generation circuit is connected with the acquisition terminal and is used for starting the acquisition terminal and starting the super capacitor to discharge by adjusting an output signal of the PWM generation circuit. By simulating main power supply and gradually regulating voltage, the power consumption of the capacitor is directly utilized, the operation process is simplified, and the discharge efficiency is improved; through circuit design, a wide power supply voltage range can be covered, voltage specifications of different super capacitors can be flexibly matched, and the problem of low discharge efficiency caused by load mismatching in a traditional scheme is avoided.

The invention discloses an energy storage method and device adopting a power electronic transformer, relates to the technical field of power electronic transformers, and solves the problems that the cooperation of energy consumption optimization and voltage matching precision is not fully considered, the energy conversion efficiency in the power storage process is relatively low, and the voltage fluctuation in the discharge process is relatively large. According to the method, the targeted turn number adjustment logic is adopted in the electricity storage state and the discharging state respectively, flexible adjustment of the number of turns of the transformer along with SOC characteristics and input voltage during dynamic adaptive electricity storage is achieved, and accurate matching of the number of turns of the transformer along with discharging voltage and electricity utilization requirements during discharging is achieved; the dynamic adjustment capability breaks through the limitation of a fixed transformation ratio of a traditional transformer, so that the thermal power energy storage system can flexibly respond to voltage requirements in different energy storage states, and the operation adaptability and regulation and control flexibility of the system are remarkably improved.

The utility model provides an on-line monitoring and diagnosing system for a flowmeter, and belongs to the technical field of monitoring and diagnosing systems. Comprising a master control circuit, a power circuit, a diagnosis circuit and an indication circuit. The power supply circuit provides direct current for the main control circuit, the diagnosis circuit and the indication circuit, the power supply circuit comprises an alternating current voltage reduction unit, a first voltage stabilization unit, a second voltage stabilization unit and a signal isolation unit, and the alternating current voltage reduction unit is used for reducing the voltage of an alternating current power supply and converting the reduced alternating current into the direct current; the output voltage can be finely adjusted by adjusting the potentiometer R5, the voltage output from the chip LM is input into the voltage stabilizer WD, after the voltage is further stabilized by the voltage stabilizer WD, stable direct-current voltage is output from a pin Vout of the voltage stabilizer WD to be used by the single-chip microcomputer UF, the smooth and stable direct-current voltage can guarantee normal work of the single-chip microcomputer UF, the photoelectric coupler U1 can electrically isolate external signals, and the output voltage of the single-chip microcomputer UF is greatly improved. The anti-interference capability of the circuit is enhanced, and the internal circuit is protected, so that the monitoring and diagnosis system can work continuously and stably.

The utility model relates to sputum suction machine pressure regulating technical field, concretely is sputum suction machine negative pressure regulating valve, including valve body, the bottom end of valve body is connected with valve nozzle, the inside top of valve body is equipped with internal thread, the inside of valve body is provided with swingle, and the surface of swingle is provided with external thread, and external thread and internal thread are connected with each other threadedly, the inside top of valve nozzle is equipped with step groove, and the inside of step groove places sealing ring, and the sealing ring is used for sealing work. The utility model discloses through the cooperation of sealing ring and swingle bottom, makes the pressure regulating fluctuation when rotating smaller, simultaneously the utility model discloses through setting up external thread on swingle, setting up internal thread in the inside of valve body, through the thread cooperation of external thread and internal thread, can pass through accurate pitch calculation, reaches the controllable range of stroke, and the precision of air pressure adjustment.

The utility model provides a kind of DC switching power supply and electric sliding door controller of electric sliding door, including main control circuit, motor drive circuit and switching power supply circuit, switching power supply circuit includes rectifier filter module and high frequency conversion module, width modulation square wave rectifier filter module and sampling comparison modulation module, switching power supply further includes voltage stabilizing module, voltage stabilizing module includes first stabilizer and second stabilizer, the input end of first stabilizer is connected with the output side of width modulation square wave rectifier filter module, the output end of first stabilizer is connected with the input end of second stabilizer, the output end of second stabilizer is connected with the power input end of main control circuit, the output end of first stabilizer is also connected with the power input end of motor drive circuit.Construction is built with 'high frequency conversion+multistage voltage stabilizing' framework, replaces traditional direct power supply, and voltage is adapted for motor, main control respectively, voltage instability problem is solved, and equipment reliability is improved.

This invention provides a method for eliminating DC secondary ripple in a through-type traction device based on multi-port collaboration, comprising: acquiring electrical quantities at three ports; constructing a second harmonic power component model for each port based on the electrical quantities at the three ports; constructing a secondary ripple elimination optimization model based on the second harmonic power component model, using the reactive power at the first input port, the reactive power at the second input port, and the voltage phase at the output port as optimization variables, with the objective function of minimizing the total second harmonic power on the DC side; solving the secondary ripple elimination optimization model to generate collaborative modulation control commands. This invention requires no additional hardware and can actively suppress DC-side secondary ripple simply by optimizing the control strategy. It can reduce DC bus voltage fluctuations, lower the requirements for supporting capacitor configuration, and is of great significance for improving the operational stability, power quality, and engineering application value of the new through-type traction power supply system.

The invention discloses a special driver for an anti-radiation high-side GaN HEMT (High Electron Mobility Transistor), which is characterized in that a DC-DC (Direct Current-Direct Current) power supply with controlled output is prepared by utilizing high-frequency oscillation, and 42V direct current can be converted into isolated 6-8V direct current. The invention further discloses a control method thereof. According to the circuit, a single-side quick starting mechanism is designed, Q1 pilot conduction is accurately controlled through an R11 circuit and an R5 / / C1 circuit, it is ensured that the power-on starting state each time is uniquely determined, and the problem of starting randomness of a traditional oscillator is solved; each time of power-on is conducted by the Q1, the starting time is short, the state is free of randomness, the oscillation period is stable, the amplitude and frequency consistency of the output driving signal is high, the accuracy of GaN HEMT conduction and turn-off control is ensured, power system fluctuation caused by unstable starting is reduced, and the reliability of the GaN HEMT is improved. In the oscillation process, a stable oscillation period is formed through closed-loop feedback of transformer voltage polarity inversion and transistor alternate saturation / cut-off, and the consistency and reliability of driving signals are improved.

This invention relates to the field of power supply technology, and discloses a method and system for stabilizing the power supply of a sauna room based on dual power supply switching. The method includes: sampling the output voltage waveform in real time to obtain a sine wave signal, identifying phase abrupt changes and amplitude dips to obtain a real-time disturbance characteristic sequence; performing trend prediction analysis on the real-time disturbance characteristic sequence to obtain a dynamic change trend, and determining a failure threshold based on the dynamic change trend; triggering a pre-switching process when the cumulative effect exceeds the failure threshold, and simultaneously capturing a zero-crossing point; using the zero-crossing point as a synchronization reference time, comparing and analyzing the current output voltage phase with the synchronization reference time to obtain a phase difference signal; adjusting the pulse frequency according to the phase difference signal until the phase difference between the current output voltage phase and the synchronization reference time is within a preset dead zone range; and controlling the sauna room to smoothly switch from the main power supply to the backup power supply. This invention can improve the stability of dual power supply for sauna rooms.

The invention relates to a multi-interface alternating-current and direct-current standby power device and a control method thereof. The multi-interface alternating-current and direct-current standby power device comprises a direct-current bus, the output side of the standby power device is provided with a plurality of direct current standby power ports, and the plurality of direct current standby power ports are respectively connected with a direct current bus through independent DC / DC converters; the input side of the standby power device is provided with a plurality of different types of standby power batteries, an alternating current standby power supply and a photovoltaic group string; the standby battery and the photovoltaic group string are connected with the direct current bus through the corresponding DC / DC converter; and the AC standby power supply is connected with the DC bus through the DC / AC converter. Compared with the prior art, the power supply access type of the direct-current standby power is expanded, the service life of the standby power equipment is prolonged, and the defect that the voltage of the original direct-current standby power system is limited by the voltage of the battery is overcome.

This invention belongs to the field of AC / DC hybrid distribution network operation and control technology. A method for autonomous and mutual-assistance operation of AC / DC hybrid distribution networks based on flexible multi-state switches includes the following steps: Step S1: Calculate the comprehensive stability index of each node; Step S2: Monitor the comprehensive stability index in real time; Step S3: In the autonomous mode, the SOP within each zone adopts an AC / DC power decoupling control strategy based on dynamic virtual impedance; Step S4: When the power deficit of a zone exceeds a preset proportion of the zone's rated load and the duration exceeds a preset time threshold, the mutual-assistance mode is activated; Step S5: When a system fault occurs, a fault recovery strategy based on model predictive control is adopted; Step S6: Monitor the communication status between the global coordination unit and the control units of each zone in real time. This achieves safe, stable, efficient, and economical system operation, reduces communication dependence, and improves power supply reliability.