3691 results about "Pwm signals" patented technology

The invention discloses a DC-DC power supply dynamic response optimization system based on digital PID, which relates to the technical field of DC-DC power supply dynamic response optimization, and comprises a voltage and current sampling module, a reference signal generation module, an output signal generation module, a digital signal generation module, a control module and an output signal generation module, the digital PID controller calculates control output according to errors, the PWM signal generation module generates corresponding PWM signals according to the control output, the power switch driving module amplifies the signals to drive a switch tube, the load monitoring module monitors load changes in real time, output of the load monitoring module can be fed back to other modules, and power supply dynamic response optimization is achieved. According to the invention, the dynamic response performance of the DC-DC power supply is remarkably improved, the output fluctuation is reduced, the recovery time is shortened, the power supply efficiency is improved, the stability is guaranteed by adopting multiple anti-interference design, peripheral elements are reduced, miniaturization is realized, the cost is reduced, fault diagnosis is realized, and the service life is prolonged.

The invention provides a reconfigurable energy storage system for online dynamic replacement of a fault battery and a control method. Firstly, a multi-level reconfigurable battery array framework is constructed, each battery module is integrated with an independent three-port power switch unit and a wireless communication node, and self-management and quick response of the battery modules can be achieved. The bottom layer battery cluster adopts MOSFET matrix topology, and the FPGA controls PWM signals to dynamically adjust the series-parallel connection structure of the batteries. And the central controller calculates an optimal connection pair in real time based on the power demand, and controls the contactor to establish a new path. When multiple modules fail, the system automatically activates three-layer collaborative reconstruction, the faulty module is switched to a bypass through a three-port switch, and a central controller periodically refreshes a charging and discharging plan according to a system state, so that the cycle efficiency of the system is improved, and the service life attenuation rate of a battery array is reduced. According to the invention, online dynamic replacement of the faulty battery is realized, the operation stability and efficiency of the system are improved, and the maintenance cost and downtime are effectively reduced.

The invention belongs to the technical field of power supply management, and particularly relates to a high-precision DCDC power supply voltage stabilization calibration system and method, which comprises a DCDC power conversion module, a traditional feedback control module, a high-frequency ripple sampling and digitization module, a dynamic load prediction module, a feedforward compensation generation module and a calibration management module, through high-frequency ripple sampling and digital output of ripple signals, real-time spectrum analysis is carried out to predict load transient changes, prospective compensation signals are generated, and traditional feedback control is combined to finely adjust PWM signals of the DCDC module. According to the scheme, feedback lag is overcome, transient overshoot / undershoot of voltage is remarkably restrained, the dynamic voltage stabilization error is controlled within + / -0.3%, and high-precision voltage stabilization under both static and dynamic working conditions is achieved.

The invention relates to the technical field of lighting, in particular to a driving power supply control circuit, a control method and a lighting application method. Comprising the steps that an acquisition module acquires spectral data and temperature data of a current environment; the receiving module receives the target color rendering index, the target color temperature and the target illumination; the control module is connected with the acquisition module and the receiving module, and is used for calculating a PWM duty ratio needing to be compensated according to the temperature data, obtaining a target PWM duty ratio based on the current color rendering index Ra, the current correlated color temperature CCT, the current illumination and the control parameters, and outputting a PWM signal based on the target PWM duty ratio and the PWM duty ratio needing to be compensated; and independent and stable constant-current signals are finally output by using the voltage balancing circuit and the driving module. The problems that an existing LED driving power source is single in function and lacks self-adaptive control capacity and monochromatic light trailing are solved. The LED powder-free lamp can continuously and stably operate, and meanwhile, high color rendering index and dynamic light color balance are achieved.

The invention relates to the technical field of power supply starting, in particular to a power supply starting system with ultra-large capacitive load energy and a starting control method.The power supply starting system comprises a power supply body and a load module, the output end of the power supply body is coupled with the load module, and the power supply body comprises a constant-current control module; the detection module is used for detecting output current in a power supply starting process and transmitting a detection result to the MCU control unit; the MCU is used for generating a PWM (Pulse Width Modulation) signal according to the received output current signal so as to control the starting current to be constant; the PWM driving module is used for adjusting the output current of the power supply according to the PWM signal generated by the MCU control unit, and the error amplifier is used for amplifying the output current signal detected by the constant current control module and transmitting the output current signal to the MCU control unit; the current sensor is used for detecting the output current of the power supply in real time; and the MOSFET switch is used for adjusting the output current of the power supply according to the PWM signal. According to the invention, the problem of restarting due to overcurrent protection caused by a large capacitive load in a power supply starting process is solved.

A controller is provided for generating carrier signals controlling a pulse width modulation (PWM) inverter driving an electric actuator. The controller includes an interface configured to connect to a victim circuit via sensors, wherein the victim circuit includes the power system or the electric actuator or a combination of the power system and the electric actuator, wherein the sensors are configured to measure an electromagnetic-interference (EMI) spectrum, a memory configured to store modulation frequency ranges, the measured electromagnetic-interference (EMI) spectral data of different frequency carriers, a desired EMI spectrum and a learning-based carrier design program, and a processor, in connection with the memory, configured to perform generating a frequency modulation (FM) carrier signal by solving an optimization problem, wherein the optimization problem is generated regarding a sweep time for a predetermined frequency by the learning-based carrier design program, and a PWM generator configured to generate PWM signals based on the FM carrier signal.

Signal processing is applied to a digital input audio signal. An analog audio output signal is provided based on the digital input audio signal via a switching converter circuit driven by a PWM signal. The analog audio output signal is sensed to generate an analog feedback signal. The applied signal processing includes: producing a digital error signal indicative of a difference between the digital input audio signal and a digital word signal; applying digital-to-analog conversion to the digital error signal to produce an analog replica of the digital error signal; producing an analog difference signal indicative of a difference between the analog replica of the digital error signal and the analog feedback signal; applying analog-to-digital conversion to the analog difference signal to produce the digital word signal; applying digital filtering to the digital word signal to produce a filtered digital word signal that generates the PWM signal.

The invention discloses a low-output-ripple automatic-current-sharing interleaving buck converter and a control method thereof.The converter comprises a main power circuit and an auxiliary compensation circuit, and the main power circuit adopts two interleaving main branches to achieve voltage conversion and energy transmission; automatic current sharing of the circuit is realized through the integrated network switch module and PWM signal control; the auxiliary compensation circuit adopts a current mirror image compensation principle, and adjusts the magnitude of the compensation current by comparing the difference between the output current of the main power circuit and the reference current, so as to effectively suppress the output current ripple; the control method comprises the steps of output voltage monitoring, PI adjustment, duty ratio modulation and a complementary control mechanism, current ripple phase offset is ensured, and the system stability and efficiency are improved. Compared with the prior art, the method has the advantages that the complexity of a control system is reduced, the working efficiency is improved, the current ripples are effectively eliminated, and the method has relatively high practical value and popularization prospect.

The invention provides a PWI modulation method for an inverter. Belongs to the technical field of power electronics, and comprises the following steps: setting basic working parameters of an inverter, initializing an initial value and a change range of a phase weighting factor, and presetting a PWF regulation strategy according to load characteristics and waveform quality requirements; loading and initializing a control algorithm of the inverter, and generating a standard sine wave as a reference wave according to a preset output voltage and frequency; calculating a PWF value of each phase point according to the current load state and a preset PWF adjustment strategy, and multiplying the PWF value by a standard sine wave to generate a target modulation waveform; and selecting a carrier signal, comparing the target modulation waveform with the carrier signal, and generating a PWM signal according to a comparison result. By presetting the PWF adjusting strategy and dynamically adjusting the PWF value, the waveform quality of the output voltage of the inverter can be effectively improved, and different load characteristics and waveform quality requirements are met.

The invention relates to a BUCK-BOOST converter control circuit, a control method and a safety air bag chip, the peak value of inductive current is detected through a current sampling compensation module, stable control of output voltage is achieved, the dynamic response speed is high, the loop stability is good, and meanwhile the circuit structure is simple. According to the BUCK-BOOST converter, stable switching of the working modes of the BUCK-BOOST converter is achieved through the mode control module, and it is ensured that the BUCK-BOOST converter can still work normally under the high voltage level. And the slope compensation unit is introduced into the circuit, so that subharmonic oscillation can be effectively prevented when the duty ratio of the PWM signal is greater than 50%, and the stability of the system is ensured.

The invention discloses a self-calibration high-resolution PWM (Pulse Width Modulation) signal generating circuit, which belongs to the field of electronic circuits and comprises a PWM signal generating module, a high-resolution module, a calibration module, a register module and an AHB (Advanced High-performance Bus) interface. The PWM signal generation module generates a coarse adjustment PWM signal based on a comparison result of the comparison register and the counter; and the high-resolution module performs fine edge positioning on the coarse adjustment PWM wave to generate a fine adjustment PWM signal. Under the condition that the clock frequency is not changed, the high-resolution module can improve the resolution of the PWM signal. The calibration module has a high-resolution calibration function, and the high-resolution calibration function can avoid the deviation of a delay value caused by the environment and ensure the accuracy and stability of the high-resolution PWM. The register module is responsible for register read-write control. The AHB bus interface part is responsible for processing bus interface signals. The self-calibration high-resolution PWM signal generation circuit has the advantages of being high in precision, high in stability, easy to IP and the like.

The invention discloses a steering engine accurate control method and system based on an optimization control algorithm, and the system comprises a data collection module which collects key working parameters of a steering engine in real time through a plurality of sensors, and carries out the data processing, thereby forming a state vector; the self-adaptive filtering module is used for carrying out self-adaptive filtering fusion processing on the data acquired by the sensor and dynamically estimating the attitude angle and the corresponding angular velocity of the aircraft; the sliding mode control module constructs a sliding mode surface and a control rate of a steering engine system according to the dynamic error of the system, calculates control input of each axis of the aircraft according to the attitude angle real-time state error, and generates a sliding mode control signal; the driving execution module is used for converting the control signal into a voltage or PWM signal and inputting the voltage or PWM signal into a steering engine, so as to change thrust and realize adjustment and control of a posture or a position; and the real-time feedback module monitors the current state of the steering engine in real time to realize dynamic correction and real-time optimization. The adaptive filtering and sliding mode control method provided by the invention is higher in control precision, quicker in system response and higher in adaptability to complex environments, and can effectively improve the application performance and stability of a steering engine execution system in the fields of industrial automation, aerospace, intelligent manufacturing and the like.

The invention discloses a control method and device of network construction type equipment, a controller, equipment and a medium, and belongs to the technical field of wind power. The method comprises the following steps: based on impedance from a grid-side converter to a power grid, a preset inertia time constant and a preset angular velocity parameter, obtaining a damping coefficient of an active power synchronization ring by using second-order system characteristics of the active power synchronization ring; performing active power synchronization operation according to the damping coefficient, the inertia time constant and the control parameter of the active power synchronization loop to obtain an internal potential phase of the network construction type equipment; performing reactive power closed-loop control operation according to the control parameters of the reactive power loop to obtain an internal potential amplitude of the network construction type equipment; and controlling the operation of the grid-side converter by using a PWM signal generated based on the internal potential phase and the internal potential amplitude. According to the embodiment of the invention, the safety and reliability of the power system can be improved.

The invention relates to the technical field of power electronics, in particular to a multi-level converter midpoint voltage dynamic balance control method, which comprises the following steps: acquiring positive bus voltage and negative bus voltage, and calculating deviation voltage of a DC side midpoint based on the positive bus voltage and the negative bus voltage; on the basis of the positive bus voltage, the negative bus voltage and the calculated deviation voltage of the direct current side midpoint, the duty ratio in the current switching period is calculated by combining the obtained balance bridge current, the obtained balance bridge inductance value and the switching period; determining the duty ratio of upper and lower tubes of the balance bridge according to the comparison result of the deviation voltage and preset positive and negative threshold values; and carrying out carrier wave comparison based on the determined duty ratio of the upper and lower tubes of the balance bridge, generating a PWM signal and driving the upper and lower tubes of the balance bridge. According to the invention, the requirements of high responsiveness and high precision of the multi-level converter on the neutral-point voltage balance performance under the dynamic operation condition can be met.

The invention relates to a stepping motor control method and device based on load torque, which mainly performs closed-loop control on a stepping motor by collecting current and voltage signals so as to optimize the working efficiency of the motor. According to the method, firstly, a current signal is filtered and compared with a target reference value, a current deviation is calculated, and if the deviation exceeds a threshold value, a target PWM signal is generated to adjust the current until the deviation is reduced to be within a preset range. When the current meets the requirement, a voltage commutation point and a current zero point are determined based on the voltage signal, the current load state and torque value are calculated by combining the time interval between the voltage commutation point and the current zero point with preset no-load time and out-of-step time, and the working current is adjusted according to the information, so that the working efficiency of the stepping motor is optimized.

The invention discloses a dual-mode dynamic cooperative control method and system based on pulling of a mooring line. The method comprises the steps that displacement electric signals are collected through double potentiometers; a Z-axis PWM signal is generated based on the displacement electric signal through a PWM signal generator; an XY-axis PWM signal is generated through the included angle difference between an XY rocker on the unmanned aerial vehicle and the mooring line; the Z-axis PWM signal is divided into two paths, one path is transmitted to a capstan electronic speed controller, and the other path is transmitted to the unmanned aerial vehicle and is combined with the X-axis PWM signal and the Y-axis PWM signal to form a three-dimensional control signal; setting a remote control signal and a winch potentiometer signal as well as a three-dimensional control signal and a winch manual signal as a first linkage group and a second linkage group respectively; when the first linkage group is switched on and the second linkage group is switched off, the unmanned aerial vehicle enters a first control mode; and when the second linkage group is switched on and the first linkage group is switched off, the unmanned aerial vehicle enters a second control mode. The method is used for solving the technical problems of single control mode, insufficient man-machine collaboration, poor environmental interference adaptability and limited control precision existing in traditional mooring unmanned aerial vehicle control.

A controller for controlling a multi-phase power conversion system includes a pulse width modulation (PWM) comparator configured to generate a PWM signal based on a ramp signal, a voltage reference signal and a feedback voltage from the power conversion system. A circuit may be configured to generate, based on the PWM signal, PWM signals by delaying the PWM signal with different delay times, and feed the PWM signals to respective switching power converters of the multi-phase power conversion system, to regulate an output voltage of the power conversion system. Each switching power converter may include a control circuit configured to adjust a pulse width of a received PWM signal based on a reference current and an output current of a corresponding switching power converter, to generate an adjusted PWM signal, based on which, an output voltage of the corresponding switching power converter is regulated.

The invention discloses an intelligent variable-frequency dimming method and system, and relates to the technical field of computer platform load balancing, and the method comprises the steps: establishing communication between a module and a gateway, loading a frequency mapping table, a duty ratio segmentation point, a safety threshold and a forbidden frequency point table, and generating an initialization vector in combination with parameters of a driver and a lamp; collecting current, voltage and optical brightness data at typical brightness points to form a matrix, calculating a risk value and marking a critical point, generating three-section type frequency mapping by combining segmentation points, and performing interpolation correction; and receiving a brightness instruction according to the mapping table to generate a PWM signal, performing slope limiting, edge shaping and micro-jitter frequency processing and outputting, and performing closed-loop frequency correction under real-time sampling. According to the method, by collecting multi-source data and introducing a stroboscopic risk model, critical point identification and three-section type frequency mapping are realized, and frequency continuity and stability are ensured by combining interpolation and forbidden frequency point constraint; on the basis, a PWM signal is generated and optimized, so that self-adaptive dimming is realized in a full-brightness interval.

A method comprises: providing, in an onboard charger of an electric vehicle, a direct current (DC) to DC stage including a dual-active bridge having switches arranged in multiple legs, each of the multiple legs controlled by a corresponding one of pulse width modulation (PWM) signals; and dynamically modulating the PWM signals to improve zero voltage switching (ZVS) in the onboard charger.

The invention provides an LED lamp adaptive speed regulation heat dissipation method and system based on real-time junction temperature monitoring. The method comprises the following steps: S100, acquiring a PWM signal or an analog signal of an LED driving command signal in real time; s200, on the basis of the change of the driving instruction signal, feedforward prediction is carried out by using a dynamic thermal inertia mapping model, and a feedforward fan control quantity is generated; s300, LED junction temperature is monitored in real time through a forward voltage method, and feedback fan control quantity is generated through a feedback controller according to the deviation between the real-time junction temperature and the target junction temperature; and S400, synthesizing the feedforward control quantity and the feedback control quantity to generate a fan PWM control signal, outputting the fan PWM control signal to a fan driving circuit, and adjusting the rotating speed of the cooling fan. According to the method, driving signals and junction temperature information are processed in parallel, and feedforward and feedback control is combined, so that self-adaptive accurate regulation and control are realized, thermal load change is quickly responded, system lag is effectively inhibited, and LED heat dissipation performance is optimized.

The invention provides a self-powered circuit of a switching power supply and the switching power supply, and the self-powered circuit comprises a first linear voltage stabilizing circuit which is connected between a common connection end of a main power tube and an auxiliary power tube and a power supply capacitor; the second linear voltage stabilizing circuit is connected with the second linear circuit in parallel; the adjusting circuit is connected with the second linear voltage stabilizing circuit and generates adjusting voltage to adjust the first charging current flowing through the second linear voltage stabilizing circuit when the second linear voltage stabilizing circuit is switched on; wherein after the switching power supply is started, the first linear voltage stabilizing circuit is switched on, and the power supply capacitor is charged; and when the PWM signal generated by the control chip of the switching power supply is effective, the second linear voltage stabilizing circuit is controlled to be switched on. According to the invention, power supply loss can be saved and system EMI can be optimized.

The invention discloses a pulsed neutron generator control system based on LabVIEW, and the system comprises a neutron generator industrial personal computer which operates a virtual human-computer interaction interface developed based on LabVIEW; the console core board carries a DSP main control chip and is embedded into a real-time operating system; the driving sampling board is connected with the console core board and is integrated with a signal conditioning circuit; the neutron generator industrial personal computer communicates with the console core board through a Modbus protocol, and controls and drives the sampling board to output control signals of the three independent power supply ion sources, the storage and the acceleration pole to the neutron tube; wherein the console core board generates three paths of PWM signals with the PWM frequency of 2.5 kHz and the step length of 8191, and the three paths of PWM signals are converted into analog control signals through the driving sampling board. According to the control system, the PWM control precision is greatly improved, the voltage control precision is improved to 0.012% (100% higher than that of a conventional scheme) through the combination of the 8191 step length (13-bit resolution) and the 2.5 kHz frequency, and the neutron yield fluctuation is controlled within + / -1.5%.

The invention discloses a charge control method and a digital control system based on a dual-active bridge resonant converter, and belongs to the technical field of dual-active bridge resonant converter control. According to the method, a resettable integrating circuit is used for sampling resonance current and converting the resonance current into integrating voltage which is in a linear relation with charge injection quantity, and an integrating capacitor is discharged and reset before each time of injection; superposing the integral voltage and the ramp voltage; comparing the superposed signal with a threshold voltage output by a current loop through a comparator, and when the superposed signal reaches a threshold value, triggering to generate a PWM signal and switching the working mode of the converter; a switching tube is controlled to act according to a PWM signal, a switching time sequence is dynamically adjusted, effective control over transmission power is achieved, and a digital control system for achieving the method is established. According to the method, rapid dynamic response, efficient power transmission and stable operation of the dual-active bridge resonant converter are realized by controlling resonance current integration and a switching time sequence, and the energy conversion efficiency and the system reliability are effectively improved.

The embodiment of the invention provides a server fan control method and device, a storage medium and electronic equipment, and relates to the field of computers.The server fan control method comprises the steps that state information of a control assembly of a target server in a shutdown state is obtained, the state information of the control assembly comprises an in-place state and a non-in-place state, and the control assembly comprises N assemblies; under the condition that at least one component in the N components is in the in-place state, the duty ratio of the PWM signals corresponding to the state information of the N components is found out from the relation mapping table, and the higher the duty ratio of the PWM signals is, the higher the rotating speed of the server fan is; based on the duty ratio of the PWM signal, a server fan is controlled to operate at a preset rotating speed, the target server supports a plurality of partitions, each component in the N components is arranged in one of the partitions according to a preset arrangement rule, and heat dissipation is performed on one group of components in the target partition by operating the server fan.

The invention relates to the technical field of electric tool control, in particular to a motor control method of a target electric tool and a motor control circuit executing the motor control method, and the method comprises the steps: obtaining peak current at a detection resistor and a current PWM signal duty ratio, calculating real-time average current according to the peak current and the current PWM signal duty ratio, and comparing the real-time average current with an average current threshold value; and adjusting the duty ratio of the PWM signal according to the result, and outputting the PWM signal to drive the motor according to the adjusted duty ratio. By dynamically adjusting the duty ratio, the stability and safety of the electric tool under high load are effectively improved, the operation experience is optimized, the hardware upgrading requirement can be met, and the use bottleneck is broken through.

The utility model provides a high-voltage pulse generating device and a test system. The high-voltage pulse generating device comprises a main control unit, a driving circuit, a pulse control circuit with a wide bandgap semiconductor power device, and an output circuit, the first end of the main control unit is coupled with the first end of the driving circuit, the second end of the driving circuit is coupled with the first end of the pulse control circuit, and the second end of the pulse control circuit is coupled with the output circuit; the main control unit is configured to generate two paths of first PWM (Pulse Width Modulation) signals with dead time control; the two paths of first PWM signals are sent to the driving circuit; and the driving circuit is configured to process the first PWM signal and then drive the pulse control circuit, so that the output circuit generates a high-voltage pulse signal. According to the utility model, the structure is simple, the cost can be greatly reduced, the output pulse speed can be flexibly set, and the CMTI test requirements of different isolated gate drivers can be met.

The invention provides a power converter and an energy storage system, and belongs to the technical field of power electronics. The power converter provided by the invention comprises an NPC three-level balance circuit, a current sampling circuit and a control circuit. Wherein the current sampling circuit can sample current which flows through the midpoint of a bus and flows through a clamping diode included in a first bridge arm in the NPC three-level balance circuit. The control circuit can determine that the clamping diode or the internal switching tube in the first bridge arm has a short-circuit fault if the current is detected to be large under the condition that the external switching tube in the first bridge arm is switched on or the internal switching tube in the first bridge arm is switched off. At the moment, the control circuit stops outputting the PWM signal to the NPC three-level balance circuit, so that each switching tube in the NPC three-level balance circuit is turned off, and the diffusion of the short-circuit fault can be avoided. Therefore, short-circuit protection of the NPC three-level balance circuit is realized, and fire caused by electric leakage of the NPC three-level balance circuit is avoided.

The invention provides a permanent magnet frequency conversion double-sine modulation swimming pool pump energy-saving control method, and relates to the technical field of motor driving and control, and the method comprises the steps: building a double-sine carrier modulation model of a permanent magnet synchronous motor, and calculating a dynamic harmonic suppression factor and a double-sine modulation depth in real time; feedforward compensation is carried out on the inverter current based on the DHSIF, and a q-axis current reference value is generated by adopting double-closed-loop vector control; dynamically adjusting a carrier frequency range according to the DSMD, generating double sine carriers with a phase difference of pi / 3, and superposing the double sine carriers into a composite modulated wave; the modulation wave amplitude is corrected through a DHSIF, and fifth and seventh harmonics are eliminated in combination with an adaptive filtering algorithm; a carrier wave ratio is dynamically optimized to generate a PWM signal, and a transient compensation mechanism is triggered to correct a voltage instruction when a load suddenly changes; and an energy efficiency optimization database is constructed to call historical optimal parameters, and nonlinear mapping of DHSIF and motor characteristics is established through parameter self-tuning. According to the invention, cooperative control is realized through dynamic harmonic suppression, modulation depth optimization and intelligent thermal protection.

A horticultural lighting device includes an LED array with multiple LED channels of different wavelengths, each having one or more LEDs. A voltage regulator supplies at least one LED channel with a constant voltage. A processor produces a PWM signal for a driving circuit coupled with the LED channels. In some cases the processor operates a tuning circuit to adjust the constant voltage thereby adjusting an intensity of the one or more LEDs of the one or more LED channels. A lighting system has multiple lamps, each with a zero cross detector that generates a timing signal based on an AC input signal. The PWM signal of each lamp has a frequency that is a multiple of the AC frequency. A method for lighting a facility includes generating a light recipe based on sensor data with an AI engine with one or more neural networks.

The invention relates to the field of PWM control, in particular to a high-precision PWM control method, device and equipment and a storage medium. The method comprises the following steps: collecting real-time charging monitoring parameters of a vehicle battery, carrying out dynamic load trend evolution, and constructing a time sequence load trend evolution curve; identifying a real-time PWM signal of the charging gun; carrying out nonlinear compensation adjustment based on the time sequence load trend evolution curve to obtain a nonlinear frequency compensation strategy; performing transient load fluctuation situation mining and transient load response matching adjustment according to the time sequence load trend evolution curve, and constructing a transient response frequency adjustment curve; and calculating the maximum safe charging power according to the real-time charging monitoring parameters, performing intelligent PWM waveform fine tuning on a transient response frequency adjustment curve, and constructing an optimal duty ratio fine tuning strategy. According to the invention, through dynamic and high-precision PWM control, the charging efficiency, safety and stability of the new energy vehicle are improved.