54results about How to "Improve dynamic response speed" patented technology

The invention relates to a temperature control method, device and equipment of semiconductor equipment and a storage medium. The method comprises the following steps: performing finite element mesh division and modal coordinate transformation on a plurality of temperature control areas of semiconductor equipment to obtain a temperature control area dynamic model; collecting measurement data of a temperature sensor and performing time-frequency domain transformation to generate a temperature prediction data sequence; gaussian mixture modeling is carried out to obtain prior distribution, and temperature parameter probability distribution is obtained; performing sub-domain division on the temperature control range to obtain a temperature inter-domain feature mapping matrix; and a temperature interval thermal coupling coefficient matrix is calculated based on the temperature control area dynamic model, a temperature control objective function is constructed in combination with the temperature prediction data sequence and the temperature inter-domain feature mapping matrix, and a temperature control quantity sequence is solved by adopting a model prediction control algorithm. According to the invention, the accuracy and dynamic response speed of temperature control are improved, and the stability of temperature control and the energy utilization efficiency are ensured.

The invention provides a carrier and an electromagnetic valve control method and system. The control method comprises the steps that a characteristic parameter set of an electromagnetic valve is obtained; characteristic parameters of each dimension in the characteristic parameter set are analyzed and determined according to parameters influencing the response of the electromagnetic valve; determining the flutter current frequency of the characteristic parameter set; determining a flutter current amplitude based on the characteristic parameter set and a first mapping relation; the first mapping relation represents the mapping relation between the characteristic parameter set and the flutter current amplitude; the target current is generated according to the flutter current frequency and the flutter current amplitude, the target current is used for controlling the electromagnetic valve, the accuracy of valve element control of the electromagnetic valve is improved, the hysteresis effect of the electromagnetic valve is eliminated, and then the dynamic response speed and the control precision of the electromagnetic valve are improved.

The invention discloses a dynamic harmonic filtering control method and system, and relates to the technical field of electric power, and the method comprises the steps: collecting a voltage signal and a current signal of a power grid in real time; performing spectral analysis on the collected signals, and extracting harmonic characteristics; based on the harmonic characteristics, generating a compensation signal and optimizing the compensation signal; dynamically adjusting filtering parameters, and injecting an optimized compensation signal into a power grid through a filter module; uploading a system operation state in real time, and detecting and marking an abnormal state; according to the invention, rapid response and efficient suppression of power grid harmonics can be realized, the adaptability and filtering precision of multi-band harmonics are significantly improved, and the total distortion rate of the harmonics is greatly reduced, so that the quality of electric energy is optimized. The system operation efficiency and stability are improved, the anti-interference capability is strong, and the system is suitable for a complex power grid environment; the system can monitor the operation state in real time, automatically give an alarm and mark abnormity, the reliability and safety of power grid operation are improved, and the maintenance cost is reduced.

The invention discloses a lift force and torque direct closed-loop control and fault-tolerant operation method and device for a six-rotor aircraft. By using the controller obtained by the invention, an optimal current instruction can be directly obtained from a lift instruction and a torque instruction, and a traditional cascaded rotating speed calculation module and a plurality of rotating speed controllers are uniformly replaced; the obtained control system can realize direct closed-loop control of the lift force and the torque, not only significantly improves the dynamic performance of the lift force and the torque, but also integrates the rotating speed resolving process using the aerodynamic parameters into the controller, and can eliminate the steady-state static error caused by mismatch of the aerodynamic parameters by means of an auxiliary disturbance observer. The steady-state control precision and the system robustness of the lift force and the torque are enhanced; and finally, for different fault modes, reconstructing a fault prediction model, a fault controller and a fault-tolerant operation control system suitable for different faults, so that excellent fault-tolerant operation of the multi-rotor aircraft in some fault modes is ensured, and the safety and reliability of operation of the multi-rotor aircraft are improved.

The invention provides a fixed frequency Boost converter control method, system and device and a medium, and the method comprises the steps: building a corresponding circuit mathematical discrete model according to the circuit topology of a converter; based on a system power balance principle, correcting the circuit mathematical discrete model to obtain a converter prediction control model; according to the converter predictive control model, a predictive control cost model is constructed based on a predictive error minimization principle; according to the predictive control cost model, constructing a duty ratio signal output model based on a minimum predictive control cost principle; obtaining a real-time optimal control output voltage according to a pre-constructed converter passive control model, and inputting the real-time optimal control output voltage into the duty ratio signal output model to generate an optimal duty ratio signal; and controlling the converter to operate according to the optimal duty ratio signal. According to the invention, the dynamic response speed and anti-interference performance of the system can be effectively improved, and reliable guarantee is provided for the dynamic performance of the converter.

The invention discloses a force balance control system for a constant-alternating-current-to-direct-current micro-electro-mechanical gyroscope. The force balance control system comprises a gyroscope closed-loop driving module, a detection modal force balance control module and a phase shifting module, the gyroscope closed-loop driving module is used for tracking the resonant frequency of a driving mode and generating a sinusoidal signal of the resonant frequency as a self-feedback excitation signal and a vibration signal of a driving mode electrode; the phase shift module is used for performing phase shift on the vibration signal as a force balance alternating current excitation signal; and the detection modal force balance control module is used for acquiring a control signal for resisting electrode vibration in the detection modal of the micro-electro-mechanical gyroscope according to the force balance alternating current excitation signal and a force balance direct current excitation signal self-fed back in the detection modal force balance control module. The resonant frequency of the modal electrode is tracked and driven in real time, stable force balance of the modal electrode is detected, the high requirement for the dynamic performance of a circuit in a force balance feedback path is lowered, and the dynamic response speed and the anti-interference capacity of a system can be effectively improved.

The invention discloses a curved surface film covering flatness self-adaptive control method based on machine vision, and relates to the technical field of mechanical arm control. The system comprises a machine vision sensing module, a robot end effector, a composite controller and a distributed clamping jaw array. The method comprises the following steps: acquiring a fringe projection image sequence and dynamic trajectory data of an end effector; performing phase calculation and three-dimensional reconstruction on the image sequence, constructing a digital elevation model and calculating flatness error data; inputting the dynamic trajectory data into a feedforward controller to generate a compensation instruction, inputting the flatness error data into a feedback controller to generate a correction instruction, and superposing to obtain a comprehensive correction instruction; and acquiring a strain sensitivity matrix, distributing the comprehensive correction instruction into displacement execution parameters of each clamping jaw by utilizing pseudo inverse operation, and issuing and executing the displacement execution parameters. According to the method, real-time sensing and active intervention of dynamic deformation are realized, and the yield and batch consistency of curved surface film coating are remarkably improved.

The invention discloses a converter feedforward decoupling control method and system for improving low voltage ride through capability, and the method comprises the steps: firstly carrying out the dynamic lead compensation of a measurement voltage after d-q conversion, so as to actively offset the amplitude attenuation and phase delay introduced by hardware links, such as a low-pass filter, in a measurement link, and restore a real power grid voltage dynamic state; and based on the accurately compensated and corrected voltage signal, positive and negative sequence separation and feed-forward quantity calculation are carried out, and finally a reference voltage instruction is generated. In this way, it can be ensured that the input signal of feedforward control accurately reflects the instantaneous change of the power grid voltage, the dynamic response speed and precision of a control system are greatly improved, current overshoot and oscillation in the voltage drop period are effectively restrained, the low-voltage ride-through capacity of a converter is remarkably enhanced, and the stability of new energy grid connection is guaranteed.

The invention discloses a multi-channel synchronous control temperature field balance control system and a temperature field air fluid balance control algorithm, the system comprises a computer, a high temperature test box and a PLC controller, the PLC controller is connected with and controls a servo cross-flow fan blade module through an EtherCAT communication technology, and the PLC controller is connected with the servo cross-flow fan blade module based on the temperature field air fluid balance control algorithm. And precise and balanced control of air fluid in the test box is realized. Compared with the prior art, the multi-channel synchronous control temperature field equalization control system and algorithm have the advantages that the uniformity of the temperature field can be effectively controlled, the control precision of the temperature field is high, and the response speed is high.

The invention relates to the technical field of thermal management of electronic equipment, and discloses a precise temperature control method for components on a circuit board, and the method comprises the steps: executing multi-dimensional state synchronous sampling through a vertical conduction structure of a heat conduction through hole and a shielding shell, and obtaining the shell temperature, the environment temperature and the load current; processing current data by using amplitude domain judgment filtering and calculating instantaneous thermal power, substituting the instantaneous thermal power into a discretized thermal resistance-thermal capacity observer model to calculate the virtual junction temperature of a component to be subjected to temperature control in real time, and calculating the total thermal regulation power by adopting a strategy of combining virtual junction temperature feedback and power feedforward for control logic; and a target driving current is directly solved based on a thermodynamic reverse physical model, and a semiconductor chilling plate or a heating film is driven to work. According to the method, physical conduction lag is compensated through estimation of the observer, and the dynamic response speed and the steady-state control precision aiming at the load step are remarkably improved in cooperation with thermal resistance parameter self-adaptive calibration.

This invention discloses a phase-shifted full-bridge plasma power supply based on all SiC devices, belonging to the field of special power supply technology. It includes: a rectifier unit with a power factor correction circuit; an inverter unit containing a phase-shifted full-bridge topology composed of SiC power devices and an energy storage inductor, achieving zero-voltage switching through phase-shift control; a transformer unit; an output unit including an output filter capacitor; and a control unit that uses an incremental PID algorithm to generate phase-shift control signals. This invention analyzes the differences in zero-voltage switching between the leading and lagging bridge arms, utilizes the low output capacitance characteristics and dynamic dead-time adjustment of SiC devices, broadens the soft-switching range under light loads, effectively reduces output current ripple, and improves dynamic response speed and overall efficiency.

The utility model provides a printer with an automatic lifting cross beam, which comprises a rack, a printing headstock, a movable cross beam and a printing platform, lifting assemblies used for driving the movable cross beam to move up and down are arranged on two sides of the printing platform, each lifting assembly comprises a mounting plate, and a screw rod is vertically mounted on one side of each mounting plate through a bearing seat. A supporting plate is vertically and slidably connected to one side of the mounting plate, and the top end of the supporting plate is fixedly connected with the bottom end of the movable cross beam; the lead screw is connected with a ball nut, and the ball nut is arranged between the mounting plate and the supporting plate and fixedly connected with the supporting plate through a fastener. Compared with the mode that a ball nut is fixed, and a lead screw rotates and moves in the prior art, the ink-jet printer has the advantages of being smaller in inertia, higher in precision and longer in service life, meanwhile, the ink-jet printer has higher acceleration and dynamic response speed, and can be better suitable for large-breadth ink-jet printing scenes.

The embodiment of the present application proposes an oscillation suppression method for a grid-type PMSG wind power system connected to a weak power grid. By establishing a Phillips-Heffron-like model of the active-frequency link of the grid-type PMSG wind power system, the influence of key parameters in the system closed-loop transfer function on the subsynchronous oscillation mode is analyzed. In combination with a quantum particle swarm algorithm, an additional damping controller is used to suppress subsynchronous oscillations by maximizing the total damping coefficient of the system. The present invention includes obtaining basic system parameters and weak power grid data, establishing a model and analyzing it, collecting real-time data and identifying anomalies, optimizing control parameters using fault data and a quantum particle swarm algorithm, and monitoring and optimizing the execution effect of the additional damping controller. The present invention effectively improves the stability and grid-connected capability of the grid-type PMSG wind power system in a weak power grid environment.

This application belongs to the field of DC bus voltage control, specifically disclosing a super-spiral sliding mode active disturbance rejection control method based on an RBF neural network, including the following steps: establishing a mathematical model of a bidirectional Buck / Boost circuit; designing an active disturbance rejection controller, which includes a tracking differentiator and an extended state observer; using an RBF neural network to dynamically optimize the gain parameters of the extended state observer in real time; constructing a super-spiral integral sliding mode controller to replace the nonlinear state error feedback loop in the active disturbance rejection controller; calculating a current reference signal based on the output signal of the tracking differentiator and the observation signal of the extended state observer through the super-spiral integral sliding mode controller; generating a drive signal based on the current reference signal to control the bidirectional Buck / Boost circuit to maintain the stability of the DC bus voltage. This application can effectively improve the stability and disturbance rejection capability of the DC microgrid bus voltage.

The present invention relates to an intelligent protection circuit suitable for a high-voltage and high-power electric rudder system, comprising: an SVPWM multi-channel processing module, a fast comparison isolation module and an intelligent protection integrated logic module, adopting a multi-channel integrated level conversion circuit, a buffer circuit with strong driving capability and a micro-sized high-speed photoelectric isolation circuit, thereby enhancing the dynamic response speed and anti-interference capability of the rudder system, solving the logic defects and insufficient dynamic response of the system control existing in a single protection mode; controlling the SVPWM output form after the two-phase current fast comparison current limiting output signal and the software current limiting control signal are subjected to logic synthesis operation and maintained by a trigger, thereby avoiding system misprotection, and having a high degree of circuit integration and intelligence, being easy to implement, having low cost and having strong adaptability.

The application provides a kind of multi-phase LLC-based direct current converter model prediction device and control method, specifically relates to direct current converter energy conversion technical field.The device includes two-stage converter cascade, input port has S, output port has N.The front stage is composed of S Buck circuits in parallel, each Buck circuit contains an inductor and two MOS tubes;The back stage is composed of N-phase LLC resonant converter, connected with the output port of the front stage Buck circuit.The front bridge of N-phase LLC resonant converter adopts half-bridge circuit, including two MOS tubes, resonant inductor, resonant capacitor and excitation inductor.The device adopts model prediction control method, the output voltage of next cycle is predicted to adjust relevant variables to maintain the purpose of output voltage.The application can access multiple voltage levels, model prediction control can be performed on direct current converter, voltage of specified voltage level can be output, voltage output can be effectively adjusted, and the demand of multi-scene application can be met.

The invention belongs to the technical field of optical storage all-in-one machine control, and particularly relates to an optical storage all-in-one machine frequency indifference and dynamic mutual damping compound control method. Comprising the following steps: S1, establishing a mathematical model for parallel connection of multiple virtual synchronous generators; s2, carrying out frequency indifference control, enabling the optical storage all-in-one machines to quickly recover to a rated frequency after load disturbance through a distributed frequency consistency algorithm, and achieving the accurate distribution of the active power of each optical storage all-in-one machine; s3, dynamic mutual damping control is carried out, a dynamic mutual damping item is introduced between the optical storage all-in-one machines, the damping characteristic of the system is enhanced, and the problems of active power overshoot and oscillation caused by load disturbance are restrained; according to the method, two strategies of frequency indifference control and dynamic mutual damping control are combined, under the condition of not depending on communication, the frequency stability and power adjustment of the district micro-grid are ensured, and the dynamic response performance and the disturbance rejection capacity of the system are remarkably improved.

A multi-circle angular displacement measuring device based on a single gear structure comprises a shell, a rotating shaft, a driving wheel, a driven wheel, magnetic steel, a deep groove ball bearing, a circuit board and a Hall chip. Three deep groove ball bearings are respectively mounted in holes in the upper and lower end faces of the bottom of the shell; the small-section end of the rotating shaft penetrates through the first deep groove ball bearing and the second deep groove ball bearing, and the root of the rotating shaft is inserted into a mounting hole of the driving wheel. The driving wheel is fixed with the inner ring of the deep groove ball bearing II; the first magnetic steel is installed in a groove of the driving wheel. A driven wheel is fixed with an inner ring of the deep groove ball bearing III, and teeth of the driven wheel are meshed with teeth of the driving wheel; the second magnetic steel is installed in a groove of the driven wheel. The circuit board is arranged on a boss in the shell; the first Hall chip and the second Hall chip are installed on the circuit board and axially correspond to the first magnetic steel and the second magnetic steel respectively. The device is high in vibration resistance, small in accumulative error, high in positioning precision, absolute in mechanical measurement, capable of achieving real absolute multi-circle angle measurement and capable of being used for application needing to track multiple rotation periods.

This disclosure provides a disturbance suppression method for grid-connected energy storage converters. By introducing an improved timing disturbance observer, it achieves rapid and accurate estimation of lumped disturbances such as grid voltage fluctuations and load abrupt changes. Combined with an adaptive sliding mode control algorithm, it dynamically adjusts the switching gain based on the sliding mode surface error, forming an observation-compensation closed-loop suppression mechanism. Simultaneously, relying on a multi-loop collaborative architecture consisting of voltage outer-loop sliding mode control, current inner-loop PR control, and capacitor voltage balance PI control, it achieves hierarchical suppression and decoupled control of multi-dimensional disturbances. Furthermore, it introduces a parameter adaptive optimization mechanism based on disturbance characteristics and device temperature, thereby significantly improving the dynamic response speed and steady-state accuracy of the system under weak grid conditions and complex operating conditions, reducing the DC voltage fluctuation amplitude, and comprehensively improving the system's stability, power quality, and wide-temperature-range operational reliability.

The application discloses a digital integral mode constant conduction time control system and method of a switching power supply, and the system comprises: a pulse signal output by a DIMCOT control module in a load change transient state is used to control a PWM waveform of a PWM generation module to change from a first level state to a second level state, a counter of a constant conduction time generation module is triggered to start counting according to the second level state, and when a count value reaches a preset value, a reset signal is generated, so that the PWM waveform of the PWM generation module changes from the second level state to the first level state, thereby obtaining a square wave signal with a preset duty cycle, and then the opening or closing of the switching power supply is controlled, and the constant conduction time of the switching power supply is realized. Thus, the switching period is changed in the load change transient state to quickly increase the PWM duty cycle, there is no inertia link in linear control, the system delay is reduced, and faster transient response, higher light load efficiency and more flexible control strategy are achieved.

The application discloses a power prediction method and device of a photovoltaic and photo-thermal coupling system and electronic equipment. According to the application, the energy distribution of solar radiation between the photovoltaic and photo-thermal units is modeled based on multi-source sensing data, the equivalent input energy of the two types of units is accurately obtained to predict the output power respectively, and the system operation parameters are dynamically optimized through evaluation indexes, so that the dynamic changes of sudden working conditions are fully adapted, the power prediction accuracy and dynamic response speed of the photovoltaic and photo-thermal coupling system are improved, the system operation parameters are optimized, the safe and stable operation of the power grid is ensured, resource waste is reduced, scheduling efficiency is improved, operation cost is reduced, high-precision requirements under complex environments are met, and the technical effect of promoting technology popularization and application is achieved.

The utility model provides a kind of elastic cycloidal pin gear reducer, comprising: driving part, cycloidal transmission part and elastic buffer part;The driving part includes motor top shell, conveying sleeve, motor shell, motor stator and motor bottom shell, the conveying sleeve is installed in the top of the inner wall of motor shell, the motor stator is installed in the inside of motor shell, the motor bottom shell is installed in the bottom of motor shell.The utility model provides a kind of elastic cycloidal pin gear reducer, compared with traditional inner rotor motor axial dimension shorter by the use of motor top shell, conveying sleeve, motor shell, motor stator and motor bottom shell, the double closed-loop feedback of cooperation motor encoder and output encoder, power response speed is accelerated, adapts to the scene of high dynamic performance requirement such as industrial robot joint.

The present application relates to the field of industrial control technology, in particular to a shear parameter adaptive control method and system for multi-hardness materials, which comprises pre-pressing and applying a micro-disturbance signal to the material to be processed, extracting the complex impedance spectrum characteristics of the dynamic mechanical response to construct the frequency domain fingerprint of the internal heterogeneous structure; predicting the load mutation based on the fingerprint to generate a virtual control trajectory based on the shear knife holder displacement; using a predictive trajectory planner to calculate the feedforward torque compensation, superimposing it with the position feedback adjustment amount to generate the optimal blade gap and shear speed cooperative motion instruction adaptive to the current hardness; the present application realizes non-destructive detection of internal hardness mutation of the material through frequency domain fingerprint technology, and uses the feedforward compensation mechanism based on inverse dynamics to adjust the driving torque and mechanical gap synchronously before the shear mutation occurs, solving the problems of response lag and easy blade collapse in the processing of heterogeneous materials.

The invention relates to the technical field of semiconductor manufacturing equipment, in particular to a pressure control system of a wafer vertical process furnace. Comprising a process chamber; the gas inlet unit supplies process gas to the process chamber; the exhaust unit comprises a vacuum exhaust loop, a normal pressure / micro-positive pressure exhaust loop and an interlocking mechanism; the vacuum exhaust loop vacuumizes the process chamber to a vacuum or low-pressure state; the normal-pressure / micro-positive-pressure exhaust loop is used for exhausting when the process chamber is in a normal-pressure or micro-positive-pressure state; the interlocking mechanism is used for ensuring that only one loop is conducted with the process chamber; the sensing unit comprises a pressure sensor for monitoring the pressure in the process chamber; and the central control unit selectively conducts the vacuum exhaust loop or the normal pressure / micro-positive pressure exhaust loop through an interlocking mechanism. The pressure control system solves the problems of poor safety, low control precision and insufficient automation degree caused by single function or low integration level of the pressure control system of the wafer process furnace in the prior art.

The application discloses a kind of intelligent laser head with molten pool monitoring, belong to laser welding technical field.The application of a kind of intelligent laser head with molten pool monitoring, including device shell, fiber laser and molten pool detection head, the lower end of positioning support is provided with clamping plate, magnetorheological fluid damper is installed between clamping plate and positioning support, two micro piezoelectric ceramic drive structures are provided in molten pool detection head, lens assembly is provided in molten pool detection head.The application solves the problem that existing laser welding head cannot ensure the long-term stability of processing focal point and monitoring line in hot machine state, the angle and position of lens assembly and built-in lens can be changed in the application, the lens position is adjusted reversely according to real-time temperature, actively compensates the optical path deviation caused by thermal expansion, lens assembly changes from passive heat to active real-time correction, ensures the long-term stability of processing focal point and monitoring line of lens assembly in hot machine state, improves work effect.

The application discloses a kind of precision manufacturing annular permanent magnet synchronous motor anti-interference control methods, comprising:1, design annular permanent magnet synchronous motor;2, according to the annular permanent magnet synchronous motor of design constructs annular permanent magnet synchronous motor second-order motion equation;3, based on annular permanent magnet synchronous motor second-order motion equation, constructs adaptive nonlinear disturbance observer;4, based on fixed time control principle, design single-loop speed-current fixed time controller and fixed time d-axis current controller, obtain q-axis reference voltage and d-axis reference voltage.The application can improve the response speed of annular permanent magnet synchronous motor, steady precision, control bandwidth, and then improve the machining precision of precision manufacturing system.

The invention discloses a single-stage AC-DC converter control method, system, device and equipment and a storage medium, and belongs to the field of electric energy conversion, and the method comprises the steps: simplifying a duty ratio expression according to a whole power factor control strategy, and obtaining a simplified conduction duty ratio; determining a Taylor expansion point according to the simplified conduction duty ratio to obtain theoretical conduction time; timing is started from the switch conduction moment of the current switching period until demagnetization is detected to be finished, counting is carried out, a predicted value of the next switching period is obtained, and a conduction time predicted value of the next switching period is determined based on the theoretical conduction time; and determining the conduction time correction based on output voltage closed-loop control, and superposing the conduction time predicted value of the next switching period and the conduction time correction to obtain the final switching conduction time so as to realize control of the single-stage AC / DC converter. According to the invention, the equivalent switching frequency can be improved, the power density of switching power supply products is improved, the device stress is reduced, and the model selection cost is reduced.

The invention relates to the technical field of liquid supply pipelines, in particular to a mining remote liquid supply pipeline multi-pump cooperative pressure control method which comprises the following steps: firstly, acquiring multi-pump operation data through intelligent sensing equipment, performing characteristic analysis in combination with target process parameters, and extracting liquid supply pressure characteristics; and then, performing control interaction on multiple pumps by utilizing the target parameters and the pressure characteristics, and analyzing real-time pressure demand information. And performing cooperative calculation based on the demand traversal pressure characteristics, and formulating a multi-pump cooperative control strategy. A simulation execution mechanism is innovatively introduced, real-time monitoring is conducted on the strategy before the strategy is issued, a simulation result is generated, the control strategy is dynamically optimized and updated according to the result, and finally intelligent cooperative pressure control over the multiple pumps is achieved. According to the method, the problems of uneven multi-pump pressure, response lag, high energy consumption and the like in traditional control are effectively solved, and the stability, the safety and the energy efficiency level of the system under complex working conditions are improved through simulation, monitoring and closed loop correction.

The embodiment of the utility model provides a power conversion circuit and a power strip. The power conversion circuit comprises an input circuit; the input end of the rectifying circuit is coupled with the input circuit; the first end of the primary coil is coupled with the output end of the rectifying circuit; a first power supply input end of the power supply chip is coupled with the first end, a sixth end is coupled with the first power supply input end, and a first grounding end is grounded; the sixth end is connected with the feedback end; the output circuit comprises a power supply output end and a second grounding end; the energy storage filtering unit is coupled between the power supply output end and the second grounding end; the second power input end is coupled to the fifth end; the second power supply input end is coupled to the power supply output end; the self-control switch unit connects and disconnects the second power supply input end and the second grounding end based on the voltage difference. According to the utility model, accurate regulation and control of the output voltage are realized by utilizing multiple transformation of the transformer and cooperating with a feedback control mechanism of the power supply chip. The on-off state of the self-control switch unit is automatically adjusted, and it is ensured that when the load changes or the power supply fluctuates, the output voltage can still be kept stable.