612 results about "Light load" patented technology

The invention discloses a servo motor dynamic overload detection and protection method based on a heat accumulation model, which relates to the technical field of servo system fault protection application, and comprises the steps of constructing a heat accumulation equivalent model, dynamically detecting an overload state, executing a heat dissipation recovery strategy, implementing a multi-stage protection mechanism, self-adaptive environment compensation and a historical data learning function. Through discretization processing of overload curve data and a nonlinear acceleration calculation strategy, the problems of protection lag and false triggering caused by traditional single-parameter detection are avoided, it is ensured that the motor can respond in time in light load, heavy load and load fluctuation scenes, the burn-out risk of the motor is reduced, and through integration of an environment temperature sensor and a heat dissipation condition evaluation unit, the reliability of the motor is improved. The heat accumulation coefficient and the heat dissipation attenuation parameter are dynamically adjusted, the problem of model deviation caused by environment interference is solved, when heat dissipation deterioration and temperature feedback abnormity are detected, the heat dissipation recovery period is automatically prolonged, calculation logic is corrected, and the continuous operation reliability of the system is improved.

The invention relates to the technical field of power system source-grid-load-storage collaborative planning, and discloses a source-grid-load-storage collaborative planning method, system and device and a medium, and the method comprises the steps: obtaining the structure, operation and economic parameters of a power system; dividing extreme scenes and establishing a frequency response model; setting a frequency security constraint based on the extreme scene; a three-layer optimization planning model is constructed, the three-layer optimization planning model comprises an objective function and constraint conditions, and the third layer comprises frequency security constraints; the model is solved to determine a planning scheme. According to the method, the minimization change point detection technology is utilized, artificial truncation of the wind-light load output features in sample selection is avoided, and the extreme scene is accurately extracted. The constructed frequency response model comprises nine frequency modulation resources and comprehensively reflects the frequency modulation capability of the novel power system. According to the provided three-layer iterative planning method, the construction investment is properly increased, so that the frequency safety of a power supply, a power transmission line, energy storage and a demand side response scheme in an extreme scene is ensured, and the frequency instability risk and the economic loss are avoided.

The invention discloses a CLLLC converter light load efficiency improvement and load expansion circuit based on variable resonant cavity regulation and control and a control method thereof. The circuit comprises a primary side full bridge, a variable resonant cavity, a secondary side rectifier and an output loop, the digital control unit detects the load in real time, and drives and switches the parallel or series capacitor branch to adjust the equivalent resonant capacitor; and the auxiliary buffer branch is used for soft start and sudden change buffer. According to the control method, capacitance is reduced during light load, efficiency is improved, capacitance is increased during heavy load, gain linearity is kept, the load range is widened, and smooth starting is achieved. The device is compact in structure and easy to control, the light load efficiency can be remarkably improved, the load application range is expanded, and the device has high reliability and good industrialization prospects.

The invention provides an electric energy metering and scheduling optimization method and system based on real-time load change. Belongs to the technical field of power energy management. The method comprises the steps of obtaining multi-source real-time load data, and performing data cleaning and fusion processing on the obtained multi-source real-time load data to obtain high-precision real-time load data; load feature extraction is carried out based on the high-precision real-time load data, and real-time load feature parameters are obtained; a real-time load prediction model is constructed according to the real-time load characteristic parameters, and the real-time load prediction model is utilized to predict the load change in a period of time in the future to obtain real-time load prediction data; dynamically adjusting electric energy metering parameters based on the real-time load prediction data to obtain real-time dynamic electric energy metering data; through dynamic measurement data feedback, an overload or light load area is rapidly identified, a real-time basis is provided for power generation planning, energy storage scheduling and demand side response, the power grid loss is reduced, and the energy utilization efficiency is improved.

The invention discloses a fan control method and device, equipment, a storage medium and a program product. The method is applied to the electronic equipment, the electronic equipment comprises a plurality of heat dissipation devices, each heat dissipation device comprises a corresponding hardware module and a fan module, parameter data of the hardware module in each heat dissipation device are collected, and the parameter data are used for determining the temperature of the hardware module; determining a rotating speed control strategy of a fan module in each heat dissipation device according to the parameter data; and then according to the running state of the electronic equipment, the rotating speed control strategy is adjusted, and the running state comprises at least one of a starting state, a standby state, a light load state and a heavy load state. According to the application, the parameter data of the hardware module in each heat dissipation device is collected and according to the parameter data, accurate control of the rotating speed of the fan is realized, and the heat dissipation efficiency of the electronic equipment is improved; the rotating speed of the fan is dynamically adjusted according to the running state of the electronic equipment, noise and energy consumption are effectively reduced, and the overall performance of the electronic equipment is enhanced.

The invention discloses a high-precision transformer fault detection method and system, relates to the technical field of transformer detection, is used for solving the problems of insensitive fault characterization and delayed diagnosis under a light load condition, and judges whether to enter a load judgment mechanism or not by acquiring input side access voltage information and counting low-load accumulated duration. When entering a load discrimination mechanism, detecting the start-stop behavior of a load branch and the temperature rise trend of a winding, calculating a light load index, identifying a light load state, carrying out region division on an iron core, collecting magnetic flux density data, and calculating iron loss balance characteristics aiming at iron loss deviation which is easy to occur under a light load condition; the insulation degradation coefficient is calculated by fusing the oil temperature peak value and the dielectric loss factor, and the abnormal index is generated with the iron loss balance characteristic, so that the early warning of the early hidden fault of the transformer can be realized in a light load scene in which the traditional temperature rise and current indexes are insensitive, and the operation reliability and maintenance efficiency of the transformer in a power distribution system are improved.

The invention discloses a soft switching modulation method and system for minimum current stress in a full power range. The system comprises an expansion phase shift optimization unit, an in-loop direct power control unit and a cooperative control unit. The in-loop direct power control unit is used for obtaining dynamic correction power, the expansion phase shift optimization unit is used for generating a phase shift ratio combination [D1, D2] which simultaneously meets the minimum current stress and the ZVS condition, and the cooperative control unit generates a PWM driving signal according to the generated phase shift ratio combination [D1, D2] to achieve soft switching control. According to the invention, the problem of current stress minimization in a wide voltage range can be effectively solved, the problem of ZVS loss in a light-load working condition can be prevented, and a load / voltage sudden change condition can be coped with in time; through the design of the ZVS boundary guarantee, the method is especially suitable for scenes needing wide voltage range efficient energy transmission, such as new energy grid connection and electric vehicle charging.

A multi-phase switching converter provided according to an aspect of the present disclosure includes a power stage and a phase controller, and provides a regulated supply voltage from an input voltage in a light load condition. The power stage receives a phase control signal and drives an inductor to cause flow of an inductor-current according to the phase control signal, wherein a load-current of the multi-phase switching converter is formed from the inductor-current. The phase controller receives a current signal from the power stage at a pin, the current signal being in an analog continuous form to represent the inductor-current in the power stage. The phase controller integrates the current signal in the analog continuous form to generate a voltage-output representing a magnitude of the load-current, and determines the magnitude of load-current based on the voltage-output.

The invention discloses an extended double-side asymmetric phase shift modulation method for a dual-active bridge converter, and belongs to the technical field of isolated high-frequency power conversion in a power electronic technology. According to the symmetric phase shift modulation method, under the condition that the voltage conversion ratio is not matched, the zero voltage switching range of a switching tube is small, the light load efficiency is low, and variable abrupt change can occur during mode switching to cause the uncontrollable oscillation problem of inductive current. The invention provides an extended double-side asymmetric phase shift modulation method for a dual-active bridge converter in a wide voltage range. A multi-objective optimization scheme is established based on the provided modulation method, and an approximation method is provided to solve a full power range analytical solution. A smooth switching method between modes is realized, and uncontrollable oscillation of inductive current can be effectively avoided. And the conversion efficiency in a full-power range is improved.

The invention discloses a global cost optimization method based on deep-sea mining operation system safety. The method comprises the following steps: determining design parameters of each system based on global cost optimization and a coupling relationship between the systems; materials are selected based on light load-stability, a self-cleaning nozzle is carried, and a crawler walking system is optimized; a two-way hydraulic-pneumatic energy conversion mechanism is used for optimizing a buoyancy compensation system; a hybrid power efficiency optimization algorithm is adopted to optimize a water surface support system based on a safety burden mitigation technology; a planetary gear is used for amplifying torque, and an electrolyzed water trigger type release mechanism is adopted in the laying and recycling process, so that a laying and recycling system is optimized; based on the principle of low energy consumption, a three-axis IMU data fusion technology is applied, and a three-degree-of-freedom active-passive combined heave compensation system is optimized; the method can effectively solve the problem of high cost of deep-sea mining, realizes safety, burden reduction, cost reduction and benefit increase of a deep-sea mining system, and optimizes the global cost of deep-sea mining operation.

The invention discloses a comprehensive energy scheduling method and system considering wind and light load uncertainty, and the method comprises the steps: constructing a comprehensive energy system model covering energy supply equipment, energy conversion equipment and energy storage equipment, and carrying out the coordinated scheduling of various types of energy. A load demand response mechanism is introduced to flexibly adjust an energy supply-demand relationship; in the aspect of describing uncertain factors, the method generates a wind and light output and load demand scene covering an uncertain space based on Monte Carlo sampling of multiple probability distribution functions, and carries out scene reduction in combination with a K-means clustering algorithm and a synchronous back substitution elimination technology so as to obtain a typical scene; in the aspect of processing uncertain factors, a two-stage robust optimization method is introduced, and a distribution fuzzy set is constrained through a comprehensive norm, so that the fluctuation range of probability distribution is limited, the influence of deviation on an optimization result is reduced, and the uncertainty of wind and light output and load requirements is processed.

The invention discloses a control method for fast switching from heavy load to light load of an LCC resonant converter, and relates to the technical field of power electronic converter control. The method comprises the following steps: S1, building an LCC resonant converter; s2, monitoring load current in real time, and identifying a load abrupt change signal; s3, calculating coordinates of an intersection point of the current working point and the target light load trajectory according to the state trajectory model; and S4, triggering a switch tube advanced turn-off instruction at the switching point, and switching the driving system to a light load mode along the transition track. According to the invention, a specific switching period is introduced during frequency switching, so that the resonant converter can be rapidly and stably switched from a heavy-load working mode to a light-load working mode. According to the switching mode, the voltage overshoot phenomenon during load sudden change can be effectively suppressed, the response time can be shortened, and the dynamic response performance of the resonant converter can be greatly improved. Compared with a traditional scheme, the system stability is improved, and the power loss is reduced.

The invention discloses a weather-based HPC resource scheduling method, which comprises the following steps of: storing meteorological data blocks into a high-speed cache region on the basis of meteorological data and access frequency to form a high-frequency data cache set; the meteorological tasks in the high-frequency data cache set are analyzed and processed, and a task priority list is generated; performing resource allocation on the task priority list to generate a resource scheduling scheme; on the basis of a resource scheduling scheme, according to a preset load balancing threshold value, dynamically adjusting tasks to be distributed to computing nodes with light loads, and generating a dynamic load balancing mechanism; performing three-dimensional grid division on the meteorological data blocks in the high-frequency data cache set to form a meteorological spatial-temporal distribution coordinate system; and transmitting resource information of each meteorological block in the task priority list when the meteorological task is executed and a corresponding coordinate value of each meteorological block in the meteorological space-time distribution coordinate system to a neural network model for prediction, and performing secondary adjustment of resource configuration according to a prediction result to complete meteorological task resource scheduling.

The application provides a transient frequency conversion control method of a converter and an electronic device. The method comprises the following steps: determining the working state of the converter, wherein the working state comprises a light load working state and a heavy load working state; if it is determined that the working state switches between the light load working state and the heavy load working state, starting a transient frequency conversion control strategy to adjust the switching frequency of the converter, wherein the transient frequency conversion control strategy is used to adjust the duration of the freewheeling stage in the switching cycle of the converter; after the working state of the converter switches, and the clamping capacitor voltage sampling value of the converter v c satisfies a preset condition, exiting the transient frequency conversion control strategy to restore the switching frequency of the converter to normal. The dynamic response speed of the converter is effectively improved, and the overshoot and drop of the output voltage when the converter is subjected to a step load are reduced.

The invention belongs to the technical field of electronic circuits, and provides a negative voltage charge pump circuit, a switching power supply converter and electronic equipment. A reference voltage generation module, a comparison module, a fourth driving module, a fifth power tube, a sixth power tube and a seventh power tube are additionally arranged on an existing charge pump. The reference voltage generation module is used for generating third reference voltage, namely threshold voltage when the negative-voltage charge pump circuit enters the light load, then the comparison module is used for comparing the third reference voltage with error voltage output by the error amplifier, and whether the negative-voltage charge pump circuit enters the light-load working condition or not is judged; when the negative-voltage charge pump circuit enters a light-load working condition, the large-size power tube and the driving module thereof are closed, and only the small-size power tube works, so that other performances of the negative-voltage charge pump circuit are ensured, the working current of the negative-voltage charge pump circuit in the light-load state is greatly reduced, and the working efficiency of the negative-voltage charge pump circuit is improved. Therefore, the conversion efficiency of the charge pump circuit in light load is improved.

The present application relates to the field of power grid energy storage, and discloses a power grid energy storage method considering wind and light uncertainty and timing characteristics, comprising: obtaining wind and light load typical seasonal scenes by SOM clustering method for scene reduction, establishing a multi-time scale energy storage model considering long-term energy storage, and constructing a power grid wind and light storage stochastic programming model considering the economy and low carbon of power grid investment; the present application solves the power balance during the day by constructing a long-short-term multi-time scale hybrid energy storage model suitable for real conditions; and at the same time, the wind and light output uncertainty and the calculation efficiency are considered, typical scenes are generated by using the SOM clustering method, and wind and light load typical seasonal data sets are obtained, so as to ensure the calculation accuracy and improve the calculation efficiency.

The invention relates to the technical field of new energy, in particular to an efficiency optimization method of a DAB converter, electronic equipment and a storage medium. The method comprises the following steps: calculating a staggered ratio coefficient and a first phase shift parameter in a heavy load mode and a first phase shift parameter in a light load mode according to an output power reference value, a battery side voltage sampling value and a bus side voltage sampling value; determining a second phase shift parameter and a switching frequency in the heavy load mode according to the staggered proportion coefficient and the first phase shift parameter in the heavy load mode, and determining a second phase shift parameter in the light load mode according to the first phase shift parameter in the light load mode; and determining a current working mode based on the staggered proportion coefficient in the heavy load mode and a preset dead zone proportion, and generating a driving signal of each power switch based on the first phase shift parameter, the second phase shift parameter and the switching frequency corresponding to the current working mode. According to the method, the overall efficiency of the DAB converter under different load conditions is improved.

The embodiment of the invention provides a control circuit of a voltage converter, a chip and electronic equipment. The control circuit of the voltage converter comprises a reference current generation circuit and a driving control circuit, the reference current generation circuit is configured to generate a minimum reference current according to the bias current source under a light load condition, generate an enhanced current according to a differential voltage of a reference voltage and a feedback voltage under a heavy load condition, and generate a target reference current in combination with the minimum reference current, and the target reference current is greater than the minimum reference current; the driving control circuit is configured to control the second power switch tube to be turned off when the inductance sampling current rises to a high-order comparison threshold value, the inductance sampling current is the sampling current of the inductance current of the voltage converter, and the high-order comparison threshold value is the sum of the minimum reference current and a preset current hysteresis window; and when the inductance sampling current is reduced to the target reference current, the second power switch tube is controlled to be conducted. The circuit realizes light-load ultra-low power consumption, heavy-load transient response and stable voltage regulation and control.

The invention discloses a dual-LLC resonant converter based on a modulatable coupling inductor. The dual-LLC resonant converter aims to meet the wide-gain application requirements of an LLC converter in the high-efficiency and high-gain power supply application fields such as a data center, energy storage conversion, direct-current adaptation and photovoltaic application. According to the invention, two connected transformers are adopted to divide a resonant cavity into two parts to form two LLC units, series connection or parallel connection application of double LLC can be realized through different switch sequences, two common resonant inductors are replaced by coupling inductors, and split capacitors are adopted as input and output filters. For the two working modes, the resonant frequency can be configured at will, and the equivalent inductance value of the coupling inductor can be changed by changing the switching sequence, thereby changing the resonant cavity parameters in different modes, and enabling the resonant cavity parameters to meet the requirements of different requirements of the converter under light load / heavy load for the parameters. Therefore, the full-range efficiency of the converter can be improved on the basis that the working modes are switched according to light and heavy load conditions to achieve wide gain.

The invention relates to a light-weight network-based voltage wave crest and wave trough rapid identification method and system, and the method comprises the steps: constructing a multi-dimensional input vector through voltage and load current dual-channel synchronous collection and feature fusion; real-time reasoning is carried out on the voltage wave crest and wave trough probability based on a lightweight neural network, and a high-confidence-coefficient triggering mark signal is generated in combination with dynamic threshold value comparison; mapping the trigger mark into a multi-phase conduction time sequence deviation matrix by using an asymmetric phase deviation algorithm, and dynamically adjusting a phase difference parameter in combination with a load current; and through a complementary PWM control instruction group generation and closed-loop optimization mechanism, ripple cancellation of staggered conduction of the multi-phase switch tubes is realized. The method solves the problem of insufficient ripple suppression caused by high false triggering rate and rigid phase distribution in traditional fixed threshold detection, remarkably improves the voltage stability and dynamic response speed in a sudden change scene from light load to heavy load, and can be widely applied to high-precision power supply systems such as data centers and communication equipment.

According to the control circuit and the control method of the vehicle charger disclosed by the invention, the rectifier bridge of the bridge PFC is removed, so that the number of switching devices is reduced, the topological cost is reduced, and the loss is reduced; power factor correction is realized through average current control, and stable 400V direct current is output for post-stage power supply after power grid side 220V alternating current is rectified; the rear-stage resonant converter is highly symmetrical in structure and has the advantages of high power density, strong energy interactivity, input and output isolation and easy realization of soft switching; a hybrid modulation strategy is adopted for the resonant converter, frequency modulation and extended phase shift segmented modulation are adopted under the normal load condition, the problem that the frequency modulation range is narrow during voltage reduction is solved, intermittent Bang-Bang charge control is switched under the light load condition, and the problems that the output voltage drift is high and the efficiency is reduced during light load are solved; therefore, the charging efficiency of the vehicle-mounted charger is improved.

The invention discloses a method for improving Buck light load efficiency, which can prevent pseudo CCM operation and can keep high light load efficiency even under a large duty ratio, and comprises the following steps: after soft start of a Buck converter is completed, an enable signal at the end of soft start sets an RS trigger U3 to be in an active state, and if an inductive current zero-cross detection trigger signal rises, the RS trigger U3 is in a non-active state, the RS trigger U3 is in a non-active state, and if the inductive current zero-cross detection trigger signal is in a non-active state, the RS trigger U3 is in a non-active state. When the high-end switch and the synchronous low-end switch are switched on, the setting end input of the RS trigger U3 is triggered, a switch starting signal output by the RS trigger U3 is set at the beginning of each switching period, the switch starting signal controls the constant on-time generator to modulate the charging current or capacitance so as to prolong the time of simultaneously switching off the high-end switch and the synchronous low-end switch, and when the synchronous low-end switch is switched on, the synchronous low-end switch is switched off. And the reset end of the RS trigger U3 inputs an output signal of the constant on-time generator to trigger the RS trigger U3 to reset.

The invention discloses a large hydro-generator full-condition field loss protection method and system, and relates to the technical field of power system relay protection, and the method comprises the steps: collecting the generator end voltage and the generator end current of a hydro-generator, collecting the bus voltage, and calculating the reactive power of the hydro-generator according to the generator end voltage and the generator end current; acquiring the node position of the field suppression switch, and judging whether the node position of the field suppression switch is abnormal or not based on the jump position of the field suppression switch, the generator terminal voltage and the reactive power of the hydro-generator; calculating a generator end current sudden increment of the hydro-generator according to the acquisition step length, and judging whether the hydro-generator has an excitation loss fault or not according to a fixed logic based on the reactive power of the hydro-generator, the generator end current sudden increment and a field suppression switch jump position with the assistance of a negative sequence voltage, a generator end voltage and a bus voltage; and if the field loss fault has occurred, executing a corresponding field loss protection action. According to the method, the phenomenon that impedance criteria are used for protecting inaction under light-load and no-load working conditions can be avoided, and the possibility of protection misoperation is reduced.

The invention discloses a cooperative operation control method and system driven by parallel pumps of a crane based on working condition identification, and belongs to the technical field of engineering machinery, and the cooperative operation control system comprises an intelligent working condition sensing and control module, a discrete hydraulic driving module, a cooperative speed regulation module and a dynamic response execution module, a parallel pump set strategy is dynamically configured in combination with working condition identification of load pressure, a cargo boom angle and a handle input signal, and flow is smoothly output as required on the basis of grading of light loads, medium loads and heavy loads and cooperative adjustment of the number of matched constant delivery pumps and the rotating speed of a motor according to the single-action working condition; aiming at the hoisting and variable-amplitude composite action, a variable-speed volume control or pump valve cooperative control mode is selected by judging the state of a proportional switch electromagnetic valve, the flow distribution and dynamic response are optimized, the energy efficiency is improved to 82% or above, meanwhile, the speed fluctuation rate control of + / -5% is realized, and the method is suitable for the electric upgrading scene of the crane.

The invention belongs to the technical field of power management, and particularly relates to an ultrasonic mode control circuit for limiting the lower limit of light load switching frequency. According to the invention, an ultrasonic mode control circuit is designed, and the ultrasonic mode control circuit is nested in the switching converter as an independent circuit and can monitor the switching period. When the switching period is close to the audio frequency range, the DCM state is forcibly quitted, and the flip point of the ZCD is adjusted through the loop to enable the inductive current to flow backward, so that the circuit balance is realized. According to the invention, the problem of noise interference of the current switching power supply converter in an extremely light load state is solved from the source. As the system load is gradually reduced, the circuit switching frequency is gradually reduced so as to improve the conversion efficiency. When the switching frequency is reduced to a designed lower limit threshold, the frequency is stable and does not continue to be reduced. The system has the advantages of a current mainstream control mode for improving light load efficiency, and solves the problem of noise during extremely light load.

The utility model provides an improved on-chip capacitor-free LDO circuit, which comprises an error amplifier EA, a buffer stage Buffer, a PMOS power tube Mp, a resistor R1 and a resistor R2, the buffer stage Buffer is realized by adopting an NMOS + PMOS combination, and an NMOS tube of the buffer stage Buffer is changed into a native NMOS tube from a common NMOS tube. According to the circuit, the problem that the LDO cannot work normally under the conditions of zero load and light load can be solved, and normal work under the conditions of heavy load and low power supply voltage can be ensured.

The utility model discloses a PFC (Power Factor Correction) inductor structure, which belongs to the technical field of magnetic core components and comprises a bearing part, a magnetic core, a winding framework, a winding, a connecting sheet and a pin, the two magnetic cores are arranged at the two ends of the bearing part respectively and are oppositely connected in an attached mode. The two winding frameworks are movably connected between the two magnetic cores in parallel in a sleeved mode, and a winding is arranged on each winding framework. The end parts of the same side surfaces of the two parallel windings are shielded and limited on the winding frameworks through connecting pieces, and the two connecting pieces are respectively and oppositely arranged to surround the two windings on the two corresponding winding frameworks. And the plurality of pins are uniformly arranged below the connecting sheet, and each pin is connected with the connecting sheet and the pin. According to the PFC inductor, the two magnetic cores are arranged on the bearing part, and the two winding frameworks and the windings are arranged on the magnetic cores in a sleeving manner, so that induced electromotive force energy generated by a conductor in a single product is enhanced, the purpose of providing a relatively large inductance value in a to-be-loaded state, a light load state or a full load state is achieved, and the working efficiency of the PFC inductor is improved.

The invention provides a cascade water-light complementary scheduling method for a water-light load multi-uncertainty distribution network system. The method belongs to the field of power system dispatching optimization. A cascade hydropower station power generation model, a photovoltaic power generation model and a distribution network system model are combined to establish a cascade water-light complementary power generation joint optimization scheduling model; converting the cascade water-light complementary power generation joint optimization scheduling model into a two-stage robust optimization model, and performing linearization processing; decomposing the two-stage robust optimization model into a main problem and a sub-problem; loosening the decomposed sub-problem and constructing a new objective function to obtain an infeasible test sub-problem; and iteratively solving the main problem, the sub-problems and the infeasible test sub-problems to obtain a day-ahead scheduling plan. According to the method, multiple uncertainties of natural incoming water and photovoltaic output of the small hydropower station are considered, the power generation flexibility of the cascade hydropower station is excavated to improve the photovoltaic absorption capacity, and efficient solution of the model is realized by providing a linearization method of the hydropower model and a sub-problem feasibility test method.

The invention discloses a topological method and system capable of improving the utilization rate of a printer power supply and a storage medium. A non-isolated / isolated Buck-Boost topological circuit composed of four MOS tube groups is adopted as a main power conversion architecture; according to the method, input and output voltage and current are collected in real time through an ADC, and intelligent control is executed by an MCU: according to an input and output voltage comparison result, three working modes of Buck, Boost or direct connection are automatically switched, so that high efficiency is kept in a full range; a self-adaptive PID (Proportion Integration Differentiation) control algorithm is adopted, for example, overshoot is suppressed by variable step size integration, surge current is prevented by double-loop amplitude limiting soft start, and electromagnetic interference is suppressed by input current ripple feedforward; in addition, the system also has optimization strategies such as light load mode consumption reduction, load sudden change pre-compensation and dynamic dead zone time adjustment, and the system correspondingly comprises an acquisition module, a control module, a power conversion module and the like; according to the invention, the problems of unstable voltage and low efficiency of the printer power supply caused by ripple and load abrupt change are solved, and the power supply utilization rate and the printing quality are improved.

The invention provides a light load control method, an LLC resonant converter using the same and a storage medium, the method is based on a double closed-loop control structure of a voltage outer loop and a current inner loop, different load conditions are adapted by automatically switching a PFM mode, a PWM mode and a BURST mode, and the method comprises the following steps: setting control parameters; sampling an output voltage Vout and an output current Iout of the LLC resonant circuit; inputting a voltage error obtained by comparing a preset reference voltage Vref with the output voltage Vout into a PI controller of a voltage outer loop, and calculating to obtain a reference current Iref; a current error obtained by comparing the reference current Iref output by the voltage outer loop with the output current Iout is input into a PI controller of the current inner loop; and judging the working mode of the current control period according to the duty ratio Duty of the previous control period and the frequency demand f output by the current inner loop. According to the invention, through combination of double closed-loop control and three-mode intelligent switching, comprehensive optimization of efficiency, dynamic response and output voltage quality in a full-load range is realized.