251 results about "Triangular wave" patented technology

The invention provides a circulation power optimization method and system for a three-phase dual-active bridge, and relates to the field of power electronics, the method comprises the following steps: determining an optimal backflow modulation strategy set corresponding to a hybrid modulation group, the hybrid modulation group comprising triangular wave modulation, trapezoidal modulation, synchronous modulation and extended phase shift modulation, the optimal backflow modulation strategy set corresponding to the hybrid modulation group comprises modulation modes and degree-of-freedom relationships corresponding to different transmission power per unit value ranges in different voltage conversion ratio ranges; determining a degree of freedom and power relationship set corresponding to the hybrid modulation group, wherein the relationship set comprises a relationship between the degree of freedom and power of different transmission power per unit values corresponding to each mode; the phase shift angle, the primary side duty ratio and the secondary side duty ratio are determined by combining the real-time voltage conversion ratio and the real-time virtual power per unit value, operation of the three-phase dual-active bridge is controlled, and the method has the advantages of reducing complexity and improving portability and efficiency.

The invention relates to a magnetotelluric noise suppression method based on ResAtt-CAE, and the method comprises the steps: generating a noise-free signal, adding a noise type into the noise-free signal to construct a noisy signal, and enabling the noisy signal to be matched with the corresponding noise-free signal to form a training set and a test set; designing a ResAtt-CAE model architecture, and realizing cross-level feature fusion by adopting a symmetric structure and jump connection; the ResAtt-CAE model architecture is trained and optimized through the training set and the test set, and the magnetotelluric noise is suppressed through the optimized ResAtt-CAE model architecture. The method is high in noise suppression capability: ResAtt-CAE captures cross-time scale signal features through multi-scale residual learning, enhances effective signal weights in combination with a time domain attention mechanism, and has a remarkable suppression effect on common magnetotelluric noise (square waves, harmonic waves, pulses, triangular waves and the like).

A light-emitting diode (LED) control unit includes: a pulse generator configured to generate a pulse signal; a T-filter configured to convert the pulse signal into a triangular wave signal; a first gate driver configured to receive the triangular wave signal and output a first gate control signal; a second gate driver configured to receive the first gate control signal and output a second gate control signal; a first switch configured to turn on a first LED string corresponding to a first color temperature based on the first gate control signal; a second switch configured to turn on a second LED string corresponding to a second color temperature based on the second gate control signal; and a power supply circuit configured to supply a power supply voltage to the pulse generator, the first gate driver, and the second gate driver by stepping down an operating voltage of the LED driver.

The invention discloses a voltage-to-current circuit, a calibration method, a multi-range calibration method and a power supply, a power amplification unit adopts MOS tubes of different channel types to match with working voltages of opposite polarities, and a bias circuit is combined to superpose exclusive bias, so that the waveform adaptation limitation of a traditional circuit is broken through, and the voltage-to-current conversion efficiency is improved. Alternating current, direct current, triangular waves, square waves and other special waveforms can be stably output, and the adaptability is greatly improved; secondly, pure hardware signal transmission and feedback are carried out in the whole process, the intermediate link of MCU measurement-setting is omitted, multi-stage error accumulation is effectively reduced, output delay is remarkably reduced, and the response speed is higher; in addition, the current sampling feedback unit and the error amplification unit form closed-loop control, power amplification output current is sampled in real time and fed back for calibration, and the precision and stability of the output current are effectively improved. Meanwhile, the bias circuit accurately regulates and controls the conduction state of the MOS tube, the linearity and consistency of current output are improved, and the overall structure is simple and reliable.

The invention discloses an electric linear servo system control method based on cascade LESO-DISMC. The method comprises the following steps: firstly, establishing a complete mechanism model of a permanent magnet synchronous motor servo loading system; then designing DOB interference observer real-time compensation by adopting a LuGre friction model and a gap dead zone model; a feedforward control quantity is constructed by utilizing a measurable displacement signal, and redundant torque is inhibited; designing a dynamic integral sliding mode controller to ensure global stability; a high-low bandwidth LESO is constructed, and both fast tracking and smooth filtering are considered; and finally, trajectory optimization is carried out, a smooth trajectory is generated by adopting polynomial interpolation for the step and triangular wave signals, and mechanical vibration is inhibited. According to the method, a LuGre friction model is adopted to compensate nonlinear friction, cascade linear LESO and sliding mode control are combined, a track is optimized through an S-shaped curve, and the problem of'differential explosion 'is solved; according to the method, instruction smoothing, core control and friction compensation are fused, and the anti-interference capability and the loading precision of the system are improved.

The invention relates to the technical field of converter control, in particular to a novel four-level efficient grid-connected system and a control method, and the method comprises the steps: determining the target output power, the target input power, the actual output power and the actual input power of a converter based on a 4L-HCC converter; determining a phase angle and an output voltage amplitude based on a preset virtual synchronous machine control strategy, and converting to obtain a corresponding three-phase reference voltage; performing HCC internal capacitor voltage control on the converter, establishing a corresponding loss function, and determining a reference wave change range corresponding to each switching device on the converter based on actual setting; the corresponding reference wave signal with the minimum loss function derivative is calculated; and carrying out phase shift pulse width modulation on the converter, taking high-frequency triangular waves with different phases as carriers, comparing the calculated reference wave signals with the carriers, calculating the duty ratio of each switching device of the converter and a switch driving signal, and driving each switching device of the converter.

The invention relates to the technical field of power grid measurement, in particular to a miniaturized wireless self-powered alternating current electric field measurement method and system. Comprising the following steps: acquiring radio frequency energy in an electric field environment, and converting the radio frequency energy into direct current electric energy through a radio frequency energy acquisition system consisting of a microstrip antenna, a voltage doubling rectifying circuit and an energy management circuit; an alternating current electric field signal is collected through a differential dual-electrode sensor structure, and an electric field voltage signal is generated; amplifying the voltage signal through an instrument amplifier, and obtaining a digital signal of the electric field signal through an analog-to-digital conversion circuit; and processing and analyzing the alternating current electric field information according to the digital signal. By combining a radio frequency energy acquisition technology with a differential dual-electrode sensing structure, the electric field sensor has the performance characteristics of self energy supply, miniaturization, high precision, wide frequency response and low power consumption. The system can measure various types of electric field signals, including sine wave, triangular wave and square wave electric field signals, has a wide frequency range and a wide measuring range, and is excellent in linearity.

The invention discloses a laser radar and a signal modulation method and device of a silicon light phase shifter, and relates to the technical field of laser radars. The signal modulation method comprises the following steps: providing an initial driving voltage signal for a silicon light phase shifter, so that the silicon light phase shifter modulates a laser signal according to the initial driving voltage signal; obtaining the phase of the laser signal modulated by the silicon light phase shifter; modulating the initial driving voltage signal into a periodic modulation voltage signal according to the phase of the laser signal; acquiring a modulation slope corresponding to the modulation voltage signal of each period; performing waveform modulation on the modulation voltage signal according to the modulation slope corresponding to the modulation voltage signal of each period to determine a modulation driving voltage signal; providing the modulation driving voltage signal to a silicon light phase shifter, so that the silicon light phase shifter modulates the laser signal according to the modulation driving voltage signal, and determining a modulation laser signal; and the frequency of the modulated laser signal is linearly changed in a triangular wave form along with time. According to the invention, the measurement precision of the laser radar is improved.

The invention relates to the technical field of geotechnical engineering anchoring, in particular to a method for testing the degradation characteristic of the bearing performance of a recyclable anchor rod under cyclic loading. The method comprises the following steps: preparing a unit body sample anchor-rock interface unit body sample, simulating weathered soft rock according to a specific ratio, pouring a self-compacting concrete anchoring body, and curing and forming; setting a combined parameter of a reference load ratio and a load cycle index, applying a triangular wave cyclic load to simulate a traffic condition, and executing a pull-out test to collect load-displacement data; constructing a two-parameter coupled shear strength degradation model based on test data, and proposing a shear stress-displacement curve model; an anchor rod load transfer control equation is established in combination with the Poisson effect, and shear stress distribution of the anchoring section is iteratively solved by adopting a discrete recursion method; the model is verified through a foundation pit engineering case, the ultimate bearing capacity degradation law of the anchor rod under long-term cyclic loading is predicted, and it is proved that the model can guide engineering safety design. According to the method, the coupling characterization of the cyclic load parameter and the interface degradation mechanism is realized.

The invention relates to a resonant optical gyroscope signal detection method based on an optical switch. The resonant optical gyroscope signal detection method comprises the following steps: step 1, adopting a narrow linewidth laser as a light source; 2, the split light field enters a lithium niobate phase modulator A and a phase modulator B to be modulated by a triangular wave voltage signal, the light field subjected to phase modulation is coupled in opposite directions to enter a waveguide resonant cavity, and a photoelectric detector A and a photoelectric detector B are used at the output end of the resonant cavity to obtain a voltage signal; and voltage signals obtained by the photoelectric detector A and the photoelectric detector B are accessed to a lock-in amplifier. 3, arranging an optical switch A between the waveguide resonant cavity and the photoelectric detector A; and an optical switch b is arranged between the waveguide resonant cavity and the photoelectric detector B, so that the detection of a gyro signal is completed. The interference of polarization noise can be reduced, and the resonant frequency locking precision and the angular velocity detection sensitivity of the gyroscope are improved.

The invention discloses an FMCW laser measurement system light source nonlinear correction method based on physical mapping modeling and a TD3 algorithm, and belongs to the fields of laser radar, laser measurement, artificial intelligence and the like. An FMCW laser measurement system is usually limited by the nonlinear characteristic of a tunable laser, especially the bandwidth is increased under triangular wave modulation, a traditional correction method is difficult to achieve a good effect, and the measurement precision and quality are affected. The invention provides an innovative correction method combining a physical mapping model and a TD3 algorithm, and provides an effective compensation mechanism for nonlinear errors of an FMCW laser measurement system under triangular wave modulation. Comprising the following steps that an FMCW laser measurement system is designed and built, PD measurement data are utilized, data preprocessing is carried out, and a data set is built; fitting nonlinear characteristics of the system by using a physical mapping relation; nonlinear correction is realized based on TD3 algorithm control; the nonlinear correction method optimizes the performance of the FMCW laser measurement system through combined application of physical mapping modeling and an RL control strategy.

An electronic device may include an inverter. The inverter may receive switching signals based on a dithered clock signal and output corresponding alternating current signals to a wireless power transfer coil. The dithered clock signal may have a plurality of frequency steps during a repeated cycle of the dithered clock signal. The repeated cycle of the dithered clock signal may comprise a step function that approximates a triangular waveform with steps having unique frequency magnitudes during the repeated cycle.

The invention discloses a trapezoidal wave current soft switching method of an interleaving DC-DC converter, which is used for a two-phase interleaving bidirectional DC-DC converter based on a coupling inductor and a multi-phase interleaving converter thereof, and is characterized in that an inductive current adopts a trapezoidal wave mode, so that the converter works in an approximate critical conduction mode; a fixed switching frequency control or hybrid control method is adopted, so that the device can work in a Buck mode and can also work in a Boost mode. The method for realizing the soft switching is characterized in that the parasitic capacitance or the external resonant capacitor of the switching tube is discharged to be zero under the resonance action of the inductor and the capacitor in the dead zone time when the upper bridge arm switch and the lower bridge arm switch are alternately switched on, so that the zero-voltage switching-on of all the switching tubes is realized. And each phase current sharing control is adopted in the multi-phase interleaving parallel topological structure. According to the invention, the problems of large current peak value and high turn-off loss of a traditional triangular wave current mode are solved, the output ripple current is reduced, a soft switching method is provided, the switching loss is reduced, and the conversion efficiency of the converter is improved.

The invention provides a digital isolator with both high-speed communication and high common-mode transient immunity. The digital isolator comprises a transmitter, a coupling inductor and a receiver, the transmitter comprises an oscillator, a modulation capacitor assembly and a common-mode transient immunity enhancement module; the oscillator is configured to receive a data signal and generate a first differential signal based on the data signal; the modulation capacitor assembly is configured to modulate a code element 0 into a first frequency and modulate a code element 1 into a second frequency; the common-mode transient immunity enhancement module is configured to determine a bias control signal according to the first differential signal; the receiver is configured to receive the second differential signal and obtain a square wave signal based on the second differential signal; obtaining a triangular wave signal based on the square wave signal; obtaining the maximum value of a triangular wave signal according to the falling edge signal of the square wave signal; and obtaining a target data signal based on the maximum value, so as to solve the problem of low communication and common-mode transient immunity performance of the existing digital isolator.

The invention provides a multi-phase pulse width modulation method and related equipment for reducing harmonic waves for a class-D power amplifier, and relates to the field of radio and television, and the method comprises the steps: sampling an original audio signal at a preset sampling rate, and obtaining a sine wave audio signal; generating a plurality of triangular wave signals corresponding to the sine wave audio signal according to a preset frequency multiple; performing amplitude comparison on the sampling signal and each triangular wave signal to obtain a pulse width modulation signal corresponding to each triangular wave signal; superposing the plurality of pulse width modulation signals to obtain a superposed signal; and inputting the superposed signal into a D-type power amplifier to obtain a power amplifier output signal after harmonic wave reduction. By implementing the method, the performance requirement on a post-stage low-pass filter can be reduced, so that the harmonic distortion of the output signal is suppressed on the premise of not increasing the cost and complexity of the filter.

A method and system delivers customizable microcurrent stimulation to ocular tissue using a three half-bridge driver circuit. The system includes a control circuit that selectively switches high-side and low-side transistors, such as MOSFETs, to generate various electrical waveforms, such as stepped, asymmetric biphasic, pulsed, and triangular waveforms. These waveforms are applied to electrodes in contact with the eye for therapeutic treatment, addressing conditions like age-related macular degeneration (AMD) and other ocular disorders. The system allows for adjustments in amplitude, frequency, and duration of the waveforms, providing personalized treatment protocols tailored to patient-specific needs. High-impedance periods are included between pulses to promote tissue recovery and enhance patient comfort. Additionally, a non-transitory computer-readable storage medium stores a program that controls the system, enabling real-time waveform generation and dynamic adjustment during treatment. This approach offers a flexible and efficient solution for ocular therapy, improving both treatment outcomes and patient experience.

A power conversion device (1A) for supplying power to a multi-phase load on the basis of a first command value, which is a sinusoidal phase voltage command value, is provided with: a multi-phase inverter circuit (3) in which branches are connected in parallel between positive and negative terminals of a DC power source, said branches being formed by connecting two semiconductor switching elements having a reverse conduction function in series, the number of branches being the same as the number of phases; a terminal between the two semiconductor switching elements of each branch is connected to each phase of a load; a modulation voltage generator (6A) that generates a second command value including a fundamental component including the first command value and a higher harmonic component including at least one sine wave having an odd number of frequencies with respect to the fundamental component; a carrier signal generator (7A) that generates a carrier signal of a triangular wave such that the frequency is odd multiples of the fundamental component of the first command value and the median of the triangular wave is zero-synchronized with the phase of the fundamental component of the first command value; and a strobe signal generator (8) that generates a strobe signal for driving the semiconductor switching element on the basis of the result of comparison between the second command value and the carrier signal.

The application discloses a self-adaptive aviation power grid input filter capacitor simplification compensation method, which simplifies input filter capacitor current to be compensated, and uses a simplified triangular wave to approximate a cosine for compensation, so that the calculation amount is greatly simplified; and the method adaptively simplifies a triangular wave approximation compensation function with the change of an input frequency and an input voltage effective value, so that the calculation amount can be further simplified. The method fully considers the problem of small storage or weak calculation capacity of the current domestic digital controller, and has strong use value for the current aviation power source domestic substitution.

The invention discloses a penetration detection method of a multi-band modulated wave radar in a non-metal medium. The detection method comprises the following steps: constructing a multi-band hybrid modulated wave radar architecture; the sawtooth wave modulation mode and the triangular wave modulation mode are subjected to alternating or mixed waveform modulation; processing the hybrid modulated wave by adopting a near-field strong clutter suppression algorithm; estimating the distance of the target by adopting a wide-range target rough measurement algorithm; calculating the distance of the target by adopting a short-distance high-precision distance measurement algorithm; performing dynamic compensation on the measurement data by adopting a Kalman filtering state estimation algorithm to obtain a distance estimation result; complementary information of long-wave and short-wave radars is utilized to form a complete detection view. And intelligent collaboration of long and short wave data is realized through hierarchical fusion. Therefore, the system can simultaneously complete large-range transmission type detection and close-range millimeter-level high-precision measurement on one platform.

The present invention provides a novel displacement sensor based on time-space transformation. This time-difference displacement sensor includes: a first reflector for receiving a laser beam reflected by a first reflective surface of a triangular wave reflector and causing the laser beam to be reflected along the same path to the second reflective surface of the triangular wave reflector during measurement; a first laser shifter for uniformly shifting the laser beam reflected by the second reflective surface of the triangular wave reflector within a set range; a first photodetector and a second photodetector for receiving the laser beam translated by the first laser shifter twice within one translation cycle of the first laser shifter; and a processing system for calculating the displacement change of the measured object based on the time difference between the laser beams received by the first and second photodetectors and the translation speed of the first laser shifter. This invention can improve the measurement accuracy of the displacement sensor.

The invention relates to the technical field of integrated circuits, and discloses a double-feedback loop spread spectrum phase-locked loop circuit. The circuit comprises a clock generation phase-locked loop and a spread spectrum signal generation loop. The clock loop generates and locks the center frequency. The spread spectrum loop adopts a time length locking principle, a fixed reference time T4 is set through a digital parameter SSR, and a feedback counter is used for measuring an output clock period to obtain a feedback time T6. The error between the T4 and the T6 is compared, the error is converted into a triangular wave modulation voltage through a charge pump and a modulation signal generator, and after superposition, a voltage-controlled oscillator is controlled to realize frequency modulation. The spread spectrum depth is directly and accurately controlled through pure digital parameters, the problems that modulation precision of a traditional scheme depends on analog gain, is limited by loop bandwidth and is complex in circuit design are solved, high-precision, programmable and stable spread spectrum clock generation is achieved, system electromagnetic interference is remarkably reduced, and the method is suitable for a high-integration-level communication chip.

The invention provides a tunnel blasting equivalent load prediction method and system based on an artificial neural network for tunnel blasting dynamic response rapid evaluation. The method comprises the following steps: firstly, establishing engineering parameters for describing a single-hole blasting working condition of a tunnel, and converting the engineering parameters into dimensionless input parameter vectors; aiming at continuity parameters and grading parameters, generating sample working conditions by adopting an orthogonal test and Latin hypercube combined sampling mode, carrying out numerical simulation on each working condition, extracting a blasting triangular wave speed-time history curve of a representative measuring point in the model, and establishing a blasting triangular wave speed-time history curve with engineering parameters of a single-hole blasting working condition as input; the database takes blasting triangular wave parameters as output; an artificial neural network is trained under the loss function, rapid prediction of triangular wave parameters is achieved, and triangular waves can serve as blasting equivalent load time history to be applied to the normal direction of the plane where representative measuring points are located and used for tunnel blasting dynamic response calculation. According to the method, the calculation cost and the modeling complexity can be remarkably reduced, and the numerical calculation stability and the engineering applicability are improved.

The invention relates to a control circuit for a switching circuit. The switching circuit receives an input signal and converts the input signal into an output current flowing through an LED load by controlling on and off of at least one switch. Wherein the control circuit comprises an error amplification circuit, a current control circuit and an overcurrent control circuit, and the error amplification circuit receives a detection signal representing output current and a reference signal and compares the detection signal with the reference signal to generate a current control signal. The current control circuit receives a current control signal and a triangular wave signal, and generates a switch control signal according to the current control signal and the triangular wave signal to control the on and off of the at least one switch. The over-current control circuit controls the current control signal according to a comparison result of the detection signal and the over-current signal, and when the detection signal is larger than the over-current signal, the current control signal is reduced to a preset voltage. According to the technical scheme, rapid adjustment of the output current when the load LED changes is achieved, and the reliability and the service life of the LED are effectively improved.

Providing technology that can suppress the sound of teeth clicking. [Solution] A motor control device comprises a transmission, a first gear connected to the output shaft of the transmission, a motor, a second gear connected to the output shaft of the motor and meshing with the first gear, and a control unit that controls the motor based on a first gear waveform corresponding to a torque waveform input to the first gear, such that the second gear waveform corresponding to a torque waveform input to the second gear is in phase with the first gear waveform, wherein the control unit controls the motor so that the second gear waveform is a triangular wave.

The invention provides a control method, a storage medium, a full-bridge inverter and electronic equipment, and the control method is applied to the full-bridge inverter, and comprises the steps: controlling the full-bridge inverter based on a triangular wave mode of an inductive current; a compensation current value is obtained, wherein the compensation current value is a negative current increment caused by full-bridge inverter inductive current falling edge sampling calculation delay; and compensating a preset extreme value of the inductive current of the full-bridge inverter based on the compensation current value. According to the control method provided by the embodiment of the invention, the compensation current is obtained based on the negative current increment caused by the full-bridge inverter inductive current falling edge sampling calculation delay, the preset extreme value of the inductive current is compensated, the negative current influence caused by the inductive current falling edge sampling calculation delay is counteracted, and the inverter efficiency and the current quality are improved.

The invention discloses a temperature isolation sampling circuit, and relates to the field of electronic circuit design, and the circuit comprises a triangular wave circuit which generates a triangular wave with a fixed period according to a threshold value comparison result in a capacitor charging and discharging mode; the temperature sampling circuit is used for comparing the sampling voltage which is output by the thermistor voltage division circuit and changes along with the temperature with the triangular wave and outputting a PWM (Pulse Width Modulation) square wave signal of which the duty ratio changes along with the temperature; and configuring an optocoupler device to work in a switching state based on a non-linear region, and transmitting the PWM square wave signal to an isolation output circuit at a low-voltage side to realize electrical isolation transmission. The device supports electrical isolation and adapts to high-voltage occasions, and the isolation voltage range depends on selected isolation elements; according to the invention, the PWM is used for transmitting the temperature signal, when the temperature signal is interfered by an electromagnetic environment, the influence on the level amplitude does not change the duty ratio, and in addition, the cost of the device is also reduced.

The invention relates to the technical field of pulse width modulation, and discloses a frequency conversion critical triangular wave pulse width modulation method and device, and the method comprises the steps: obtaining the overlapping conduction time of two lower tubes of a secondary side of a dual-active bridge converter, and enabling the overlapping conduction time to be obtained through current closed-loop control; judging whether the switching period exceeds a preset time threshold value or not according to the overlapped conduction time and the inductor follow current time; and if the switching period exceeds the preset time threshold value, converting the preset time threshold value and the overlapping conduction time into a duty ratio and a frequency, and then carrying out frequency conversion critical triangular wave pulse width modulation on the dual-active bridge converter. According to the technical scheme, the frequency variable can be introduced, so that the inductive current triangular wave stably works in a critical continuous state all the time. The power is improved through the synergistic effect of frequency conversion and peak current increase, and meanwhile, the increment influence of the stage that the inductive current is reduced to 0 on the peak current is counteracted through frequency compensation, so that the turn-off loss at the inductive peak current is greatly reduced, and the heating problem of a system switch tube is effectively relieved.

The drive device includes: a motor; an inverter that drives the motor; and a control device that sets a three-phase voltage command on the basis of a torque command of the motor, generates a three-phase PWM signal by comparing a three-phase voltage command-related value associated with the three-phase voltage command with the triangular wave, and controls the inverter. In this case, when the difference between the two-phase voltage command-related values among the three-phase voltage command-related values is equal to or less than a prescribed difference, the control device corrects the voltage command-related values so that the latter one of the crossing timings of the two-phase voltage command-related values and the triangular waves is further delayed.

The invention relates to a voltage conversion circuit and energy storage equipment. The voltage conversion circuit comprises a first control module, a second control module, a temperature sensing element, an energy storage element and a logic module. The resistance value of the temperature sensing element is in positive correlation with the temperature parameter of the voltage conversion circuit. And the first control module is used for conducting a charging path from the input power supply and the temperature sensing element to the energy storage element under the condition that the first control module is in the conducting state. The second control module is used for controlling the first control module to disconnect the charging path and conducting a discharging path between the second control module and the energy storage element under the condition that the charging voltage of the energy storage element reaches a first preset voltage, so that the energy storage element discharges through the discharging path; a triangular wave voltage signal of the first end of the temperature sensing element is obtained based on the charging and discharging process of the energy storage element. And the logic module is used for converting the triangular wave voltage signal into a PWM signal. By adopting the voltage conversion circuit, the temperature stability can be improved.

The invention provides a sensorless control method for a permanent magnet synchronous motor based on high-frequency triangular wave signal injection of a random slope. The sensorless control method comprises the following steps: forming a high-frequency triangular wave voltage injection signal of the random slope; injecting the high-frequency triangular wave voltage injection signal into the permanent magnet synchronous motor in a low-speed operation interval of the permanent magnet synchronous motor, and extracting a current response signal; performing high-pass filtering on the extracted current, extracting a high-frequency response current envelope containing rotor position information from the filtered high-frequency response current by using a demodulation signal, and performing low-pass filtering; and extracting rotor position and rotating speed information from the high-frequency response current envelope by using a normalized phase-locked loop structure, and performing closed-loop control of sensorless control of the permanent magnet synchronous motor by taking the extracted information as a feedback signal. According to the technical scheme, through random slope triangular wave signal injection, the current spectrum is uniformly distributed, sharp noise is converted into white noise, and the acoustic performance is improved.