420 results about "Overmodulation" patented technology

The invention discloses a micro-grid power control method, system and device based on fuzzy modulation and a storage medium, and relates to the technical field of intelligent grid integration of a photovoltaic system and a micro-grid, and the method comprises the steps: firstly obtaining the real-time power data of a photovoltaic system, carrying out the control processing through fuzzy logic, and calculating a reference instruction; according to the reference instruction, hysteresis time is dynamically adjusted through modulation hysteresis control, and an inverter switching signal is generated; converting direct current into alternating current based on the switching signal and a power switching device, injecting the alternating current into the micro-grid, calculating active and reactive power reference values, ensuring that the system operates according to a unit power factor, and giving active power to the reference value; according to the method, the power control precision and adaptability of the micro-grid are improved, excessive switching of the inverter is avoided, loss is reduced, the service life is prolonged, power matching and stable transmission are achieved, reactive loss is reduced, bus voltage is stabilized, harmonic waves can be reduced, the electric energy quality is improved, and efficient and stable operation of the micro-grid is guaranteed.

The invention discloses a nonlinear OFDM (Orthogonal Frequency Division Multiplexing) information transmission method and system based on frequency domain symbol block modulation, an information sending part adopts a frequency domain symbol block to bear bit information, the relative amplitude and phase state of two symbols in the frequency domain symbol block are used for loading the bit information, and the power constraint is met; performing OFDM modulation on the frequency domain symbol block to form an OFDM time domain signal, and performing time domain up-sampling, iterative clipping and filtering and digital pre-distortion to reduce the interference of an output signal of the nonlinear power amplifier on an adjacent channel; and the information receiving part is used for performing nonlinear signal reconstruction on the received signal with peak distortion by utilizing frequency domain symbol block constraint and signal distortion characteristics, performing OFDM demodulation, detection and frequency domain symbol block de-mapping on the reconstructed signal, and recovering and sending bit information. According to the method, the adjacent channel interference performance and the information transmission performance of the power amplifier under nonlinearity can be improved, the power rollback requirement of the power amplifier is reduced, and the energy efficiency of an OFDM system is improved.

The invention relates to the technical field of motors, in particular to a space vector modulation method of a five-phase series end winding permanent magnet synchronous motor, which comprises the following steps of: drawing voltage vector distribution; dividing a maximum modulation domain; obtaining a three-dimensional space modulation domain and a two-dimensional space modulation domain, obtaining a basic voltage vector adjacent to a sub-tetrahedron where each reference voltage vector is located and a duty ratio of the basic voltage vector, and judging whether each reference voltage vector is over-modulated or not; performing overmodulation on each reference voltage vector in the three-dimensional space modulation domain and the two-dimensional space modulation domain; if the duty ratio of the upper bridge arm is larger than 1, a double-sampling-period modulation strategy is adopted for modulation; and the switch sequence is centrally symmetrical and then input to a five-phase six-bridge arm series end winding inverter. According to the method provided by the invention, the reference voltage can be tracked with relatively high precision, the harmonic current and the zero-sequence current can be effectively suppressed, and the method has relatively high DC bus voltage utilization rate.

The invention relates to a method and a device (100) for generating a useful signal (11) from a signal (5') emanating from a spin-based quantum system (4), comprising exciting the spin-based quantum system (4) by an electromagnetic field (3) which oscillates between two states at a modulation frequency, detecting the signal (5') emanating from the spin-based quantum system (4) to obtain a measurement signal (7), multiplying the measurement signal (7) with a modulation signal (9) which oscillates between two modulation signal states at the modulation frequency to generate a modulated measurement signal (7'), and demodulating the modulated measurement signal (7') to generate the useful signal (11).

Aspects of the present disclosure provide an over-the-air (OTA) interferometer that enables redirecting, by a reconfigurable intelligent surface (RIS) to a destination, a signal that impinges the RIS at each of a plurality of time slots, thereby modulating the signal. The RIS is virtually divided into a plurality of RIS portions. In each time slot, phase components to be applied to the plurality of RIS portions are determined based on one or more phase values. The phase values may include an underlying phase related to redirecting a source signal, an additional phase related to data that an input operatively connected to the RIS aims to transmit to the destination by modulating the signal being redirected, and / or a further phase related to interference patterns that can help extract the data phase at the destination. The destination may demodulate the received signals based on the signal strength measurements.

The invention discloses a grid-connected inverter sliding mode control method based on a reduced-order generalized proportional-integral observer, and the method is applied to closed-loop control of a grid-connected inverter. The specific implementation method comprises the steps that a given power reference value is subjected to PQ control to obtain a current reference value, and the form of a reduced-order generalized proportional-integral observer is designed according to a state-space equation of the grid-connected inverter and used for observing the output current value and the total disturbance of the system. A backstepping method is combined with a super-spiral sliding mode to serve as a controller of a current loop, a control law output by the controller is subjected to an SPWM modulation method to obtain a trigger pulse signal of a switch tube, and closed-loop control of the grid-connected inverter is formed. According to the control method, the change of external disturbance can be more effectively resisted, the coupling influence between the d axis and the q axis is reduced, higher robustness and adaptivity to load disturbance are achieved, and stable operation of the grid-connected inverter is facilitated.

The invention discloses a coding method and system based on deep learning and compressed sensing assistance, and belongs to the technical field of optical transmission. The method comprises the following steps: carrying out coding mapping on bit data, carrying out codebook design by using an AlexNet model, and training each codebook through five convolutional layers to obtain an error rate in a current environment; performing data mapping on the codebook with the lowest bit error rate; performing compressed sensing on the data signal mapped to the codebook; the method comprises the following steps of: firstly carrying out OFDM (Orthogonal Frequency Division Multiplexing) modulation on a signal subjected to compressed sensing, then carrying out signal transmission and signal demodulation, reconstructing the signal, demapping the reconstructed signal into a codebook signal, and finally decoding the codebook signal into an original signal through a decoder. The SCMA modulation is combined with the convolutional neural network technology and the compressed sensing technology, an encoder and a decoder of the SCMA are established, the bit error rate is minimized, signals are processed by using the compressed sensing theory, the amount of data needing to be collected, transmitted and processed is greatly reduced, and data are transmitted by occupying less subcarriers.

The invention provides an anti-interference phase estimation method suitable for MSK modulation, which belongs to the technical field of anti-interference phase estimation and comprises the following steps: S1, an interference identification and marking step which comprises a signal capturing and hopping link, an interference detection algorithm link and an interference mask generation link; s2, an interference range judgment and processing step, wherein the step comprises a whole-hop interfered processing link, a partial interference processing link, a pilot frequency sequence reconstruction link and a phase estimation and compensation link; and S3, a data integration and post-processing step, wherein the step comprises a demodulation link, a data splicing link, a de-interleaving processing link, a channel decoding link and a performance feedback link. In order to solve the problems that the coding gain of a decoder is reduced and the communication performance is influenced by a traditional method when short-time sudden interference occurs in communication, the phase can still be effectively estimated by using data which are not interfered through the characteristics of MSK modulation, so that the data which are not interfered can participate in subsequent demodulation and decoding, and the communication performance is improved. And the anti-interference capability of the system is effectively improved.

The invention relates to the technical field of power cable data communication, in particular to a power line carrier communication system peak-to-average power ratio suppression method, which comprises the following steps: carrying out structure definition on modulated frequency domain data at a sending end, constructing a complete spectrum signal, and carrying out copying based on the complete spectrum signal to respectively obtain a processing signal and an original signal; training an LSTM auto-encoder model, and inputting the processing signal to the trained LSTM auto-encoder model to optimize the bit error rate and the peak-to-average ratio loss so as to generate a peak clipping signal; splicing the peak clipping signal with the original signal to form a new sending signal; a transmit signal is converted into a time domain signal based on an inverse fast Fourier transform. The method has the effect of improving the carrier communication quality and communication efficiency of the power line.

The invention discloses a converter grid following-grid construction control mode smooth switching method suitable for wide-range source-grid state change. The method comprises the following steps: constructing a phase-locked loop control loop, a power outer loop control loop and a current inner loop control loop of a grid following type converter based on constant power control; constructing a voltage control loop, a phase control loop and a voltage and current double-closed-loop control loop of the network construction type converter based on the virtual synchronous generator VSG; calculating real-time output active power P and reactive power Q of the converter; constructing a voltage phase synchronization loop switching control loop and a current instruction tracking loop, and realizing smooth switching of dq-axis current instruction values output by a power outer loop of a following network type and a voltage outer loop of a construction network type; and the output dq-axis current instruction value is transmitted to a current inner loop to generate a final voltage signal, and a PWM wave is output to the converter through a modulation link. According to the method, a voltage phase synchronous switching compensation mechanism is adopted, a voltage amplitude and a phase signal are synchronously corrected in the mode switching process, and smooth change of an inner ring current reference signal is achieved.

The invention provides a three-phase four-wire parallel inverter system circulating current suppression method based on 3D-SVPWM (three-dimensional space vector pulse width modulation), and the method comprises the steps: changing a zero-sequence voltage difference through changing a difference value of zero-sequence duty ratios of two inverters through a 3D-SVPWM strategy, thereby suppressing the zero-sequence circulating current in the parallel inverter system, and achieving the purpose of suppressing the circulating current in the parallel inverter system. The parallel inverter system comprises a parallel inverter circuit module, a 3D-SVPWM modulation module and a closed-loop control module. According to the method, zero-sequence circulating current suppression of the three-phase four-leg parallel inverter system can be realized, the steps are simple, the system loss can be reduced, the efficiency and reliability of the parallel four-leg inverter system can be improved, the service life of the parallel four-leg inverter system can be prolonged, and a relatively good zero-sequence current suppression effect can be achieved.

The invention relates to an MMC (Modular Multilevel Converter) optimal zero-sequence signal calculation method for an overload operation demand, which belongs to the field of power electronic converter signal modulation, and comprises the following steps: constructing an optimal zero-sequence signal calculation operation domain; establishing an optimal zero sequence signal solving mathematical model; continuously iterating the active power and the reactive power, inputting the optimal zero-sequence signal to solve the mathematical model, solving to obtain a plurality of groups of maximum modulation signal margin values Mar, amplitudes and phase angles of corresponding zero-sequence signals, namely amplitudes and phase angles of optimal zero-sequence signals, outputting and recording, and respectively forming an OPA3 (P, Q) table and an OPAlf3 (P, Q) table; and fitting the table by adopting a function fitting mode to obtain a final fitting functional expression which is used for subsequently and quickly calculating the amplitude and the phase angle of the optimal zero-sequence signal. According to the invention, the operation time of modulation signal overmodulation caused by overload operation of the MMC can be greatly reduced, and the problem that the service life of a switching device is shortened due to modulation signal overmodulation is reduced.

The invention discloses a low-harmonic high-voltage speed regulation system based on a multi-pulse phase-shifting transformer, and particularly relates to the field of power electronic technology and motor speed regulation, which is characterized in that the primary side of the multi-pulse phase-shifting transformer is in star connection, and N groups of windings on the secondary side are in extended delta connection, so that phase difference is realized; the multi-path low-voltage alternating current is converted into multi-path low-voltage alternating current and low-order harmonics are High voltage is output through cascade H-bridge topology series connection, and reliable conversion is guaranteed through rectification filtering inversion and device redundancy design; the motor control module collects signals through multiple sensors, and PWM drive signals are generated through a vector control algorithm and coordinate transformation. The harmonic detection and compensation module detects harmonic waves based on an FFT algorithm, and injects a reverse compensation component through a modulation strategy to offset the harmonic waves; and the auxiliary protection module integrally realizes low-harmonic and high-precision high-voltage motor speed regulation through multi-dimensional monitoring and hardware protection.

The invention discloses a cooperative control method for neutral-point balance and circulation suppression of an inverter. The method comprises the following control steps: collecting three-phase current of a power grid side, and generating a three-phase bridge arm modulation signal through a grid-connected current control loop; collecting a lower half bus voltage and generating a first zero-sequence component through a neutral-point balance control loop; collecting three-phase current on the power grid side, and generating a second zero-sequence component through a circulating current suppression control loop; inputting the first zero-sequence component and the second zero-sequence component into a competition logic processing module, and generating a final zero-sequence component by using a competition mechanism based on dynamic weight distribution; and the final zero-sequence component is subjected to over-modulation processing and then superposed to a three-phase bridge arm modulation signal of a grid-connected current control loop, and then a control signal of the three-level inverter is obtained after PWM (Pulse-Width Modulation). The method has the advantages that by dynamically coordinating the midpoint balance and circulating current restraining requirements, efficient coordination of the midpoint balance and the circulating current restraining requirements can be achieved, the control complexity is reduced, and the method is suitable for low-cost industrial application scenes.

The invention provides an overmodulation control method and module for motor control and a medium, and relates to the technical field of motor control, and the method comprises the steps: obtaining a modulation ratio and a voltage vector angle, and constructing an initial three-phase modulation wave which is a three-phase modulation wave with the modulation ratio of 1 obtained after a common-mode component is injected into carrier modulation; rotating by 90 degrees based on the initial three-phase modulation wave and acquiring a voltage gain associated with the initial three-phase modulation wave so as to generate a three-phase voltage signal wave; when the voltage signal value of each phase in the three-phase voltage signal wave does not exceed + / -1, the inverter performs modulation based on a modulation ratio; when only one phase value of each phase voltage signal wave in the three-phase voltage signal waves exceeds + / -1, the inverter determines the gain of the exceeding part according to the three-phase voltage signal waves so as to carry out modulation; when more than one phase value of each phase voltage signal wave in the three-phase voltage signal waves exceeds + / -1, the inverter outputs a basic voltage vector, and the problems that the harmonic content of an existing overmodulation algorithm is large, and smooth transition to square waves cannot be achieved are solved.

The invention discloses a control circuit and method for a three-phase single-stage AC / DC converter, and belongs to the technical field of electric energy conversion, and the method comprises the steps: collecting the resonance current in a DC / DC resonance circuit, calculating the integral value of the resonance current, outputting a signal after modulation, and determining the drive logic of a switch in the DC / DC resonance circuit. According to the control circuit and method of the three-phase single-stage AC / DC converter, energy transmitted by the resonant cavity can be directly controlled, the resonance condition of each switching period element does not need to be considered, parameter design is simple, the dynamic performance of a system can be improved, and the control speed of three-phase current can be increased.

The embodiment of the invention discloses a multiplex type three-stage starting power generation controller, and relates to the technical field of aviation three-stage starting power generators. In the starting stage, an H-bridge inverter in the starting power generation controller provides single-phase alternating-current exciting current for a main exciter stator exciting winding through SPWM modulation so as to establish a pulsating magnetic field to provide exciting current for a main motor, and a three-phase full-bridge inverter provides armature current for a main motor stator armature winding through SVPWM modulation. In a power generation stage, an anti-parallel diode of the three-phase full-bridge inverter is used as a rectification circuit of the auxiliary exciter, and the H-bridge inverter adopts a PWM chopping mode to operate as an asymmetric half-bridge circuit. A power generation controller and a starting controller are integrated into a whole, and by changing the modulation mode of a hardware circuit, the control function of the three-stage starting generator at different stages can be realized by only one controller, so that the structure of the starting power generation controller is simplified, the system integration degree of the three-stage starting generator is improved, and the volume and the weight of the system are reduced.

The invention relates to a fractional frequency division all-digital phase-locked loop based on a DTC and an edge time domain compensation algorithm, and belongs to the field of radio frequency integrated circuit design. The whole circuit structure comprises a time-to-digital converter (TDC), a digital loop filter (DLF), a digital controlled oscillator (DCO), a programmable frequency divider (MMD), a Sigma-delta modulator and a digital-to-digital converter (DTC). A fractional frequency division function is realized by combining a programmable frequency divider MMD, a Sigma-delta modulator and a digital time converter DTC, a quantization noise optimization circuit is designed mainly by adopting a time domain compensation method, a low fractional spurious effect is realized by combining the DTC, and then signals of fractional frequency division are output and integrated in a phase-locked loop. In a phase-locked loop, a signal output by a Sigma-delta modulator is integrated with a frequency division signal, then a DTC performs time domain compensation according to the signal output by the Sigma-delta modulator, and then transmits the signal to a TDC for phase comparison with a reference signal to control the frequency output of a DCO, so that the high-performance all-digital phase-locked loop circuit with low decimal stray is realized.

The invention provides a flexible direct current converter valve system and a modulation method thereof. Based on a novel hybrid module series structure, target voltage modulation is carried out by controlling a switch device trigger pulse in stages through polarity distribution of modulation wave voltage and bridge arm current. And executing a four-stage pulse adjustment process in an inversion or rectification mode, and dynamically managing the removal and input time sequence of the improved half-bridge power module. According to the method, the trigger pulse is accurately regulated and controlled according to the real-time polarity and the transition state of the voltage and the current, and the problems of instantaneous overcurrent and local overheating of a switching device under the overload condition in the traditional bridge arm topology are avoided. Through staged logic control, the system maintains the stability of the modulation wave voltage, reduces the thermal stress accumulation of the device, improves the endurance capability of the converter valve under a complex working condition, does not need external current limiting intervention, and enhances the operation flexibility and reliability.

The invention provides a capacitor voltage fluctuation suppression method for a modular multi-level matrix converter, and the method comprises the steps: obtaining the capacitor voltage and current of each bridge arm of an M3C under a double alpha beta 0 coordinate system, calculating the three-phase reference voltage of the input side and the output side of the M3C according to the type of an AC system connected with the two sides of the M3C, and carrying out the calculation of the three-phase reference voltage of the input side and the output side of the M3C; the basic output reference voltage of the bridge arm is determined; calculating an injectable common-mode voltage range, and determining a reference value of the injected common-mode voltage; calculating a ring current reference value required for balancing the capacitor voltage, and obtaining a ring current voltage reference value through closed-loop control; the loop current reference voltage of each bridge arm is calculated through inverse double alpha beta 0 conversion, the total bridge arm output reference voltage is obtained by combining the bridge arm basic output reference voltage and the common-mode voltage reference value, the control of the output voltage of each bridge arm is realized through modulation, and a driving signal of a switching device is generated. Compared with a conventional high-frequency sine common-mode injection method, the method can effectively reduce the capacitor voltage fluctuation, and reduces the current amplitude of a bridge arm.

The invention discloses a photovoltaic air conditioner and a direct current component suppression method thereof, electronic equipment and a medium, and the suppression method comprises the steps: building a bus ripple detection circuit at the direct current side of a single-phase inverter, and obtaining a bus ripple sampling result; carrying out primary compensation on a direct current component, and generating a current for compensation based on the direct current bus voltage; subtracting the acquired actual grid-connected current to obtain a grid-connected current error value, compounding the grid-connected current error value with a power grid voltage feed-forward signal and a capacitance current feedback signal to generate a duty ratio signal, and driving an inverter in an SPWM (sinusoidal pulse width modulation) mode; carrying out secondary compensation on the direct current component, carrying out phase tracking on the voltage of the power grid through SOGI-PLL with FLL, and generating a phase-synchronous current modulation signal; and adding the compensation signal with the current difference to obtain a compensation signal, and adjusting the duty ratio of the inverter. According to the invention, the grid-connected direct-current component of the photovoltaic household air conditioner is effectively reduced.

A 4 frequency-shift keying (4FSK) transceiver is provided. The 4FSK transceiver includes both a 4FSK transmitter and a 4FSK receiver. The 4FSK transmitter includes a voltage-controlled oscillator (VCO) and two data links coupled to the VCO for delivering two parallel streams of input data bits to the VCO. For each pair of parallel input data bits received from the two data links, the VCO outputs a modulated signal having one of four operating frequencies via 4FSK modulation. Separately, the 4FSK receiver includes a power divider, for dividing the multi-frequency modulated signal into two paths of two binary bit streams, and a pair of low-noise amplifiers (LNAs) separately coupled to the two paths and configured as a pair of band-pass filters for filtering two different subsets of the four operating frequencies from the two binary bit streams into two filtered binary bit streams.

An assembly and method are disclosed for generating and detecting a modulated pressure signature in a fluid transported to a subsurface injection zone. The assembly includes a pump, a pulsation dampener, and a pressure modulation device that oscillates pressure to produce a frequency-modulated signature in the fluid, resulting in an alternating current streaming potential (AC-SP) at the injection zone. The method includes recording modulated electromagnetic signals at an array of electromagnetic field receivers on a surface above the subsurface injection zone, processing the data to identify source frequency signals, and correlating these signals to image subsurface fluid or pressure distribution, enabling three-dimensional mapping of subsurface structures.

The invention discloses a chaos communication and perception integrated signal processing method and device and a communication system, and the method comprises the steps: segmenting an information bit sequence into a modulation bit sequence, an index bit sequence and a PPM bit sequence, and carrying out the processing of an initial signal vector through the combination of a pulse position modulation technology, according to the scheme, the frequency spectrum utilization rate is optimized through dual control of modulation bits and index bits, initial modulation signals are segmented according to PPM orders, signal vectors are generated, time domain offset is carried out on the signal vectors in combination with a shift matrix, the good self-correlation characteristic and the low cross-correlation characteristic of LFM signals are utilized, on the basis of an original DCSK-LFM modulation mode, the frequency spectrum utilization rate is improved, and the frequency spectrum utilization rate is improved. And in combination with pulse position modulation and index modulation, the same carrier can bear more information, so that the transmission rate when the method is applied to a JRC system and the overall performance of a communication system are improved.

The invention discloses a dynamic nonreciprocity modulation method and system based on double-cavity coupling and a storage medium. The method comprises the following steps: establishing a double-atom-double-cavity waveguide QED system model; calculating a momentum equation of the double-atom-double-cavity waveguide QED system; calculating a transmittance expression of photons according to the momentum equation; non-reciprocity modulation of photon transmission is realized by modulating atomic frequency and / or mutual coupling strength of the double cavities. According to the invention, the problem that effective photon non-reciprocal transmission is difficult to realize in a broadband range in the prior art is solved.

The application provides a kind of FMCW laser radar signal processing method and system, method includes: the laser signal generated by laser is divided into measurement light signal and local light signal;Input measurement light signal to light modulator, modulate by modulated sine wave sweep signal;Amplify modulated measurement light signal, emit to the detection target by circulator, collimating mirror, receive reflected signal;Coupling with reflected signal, enhance the energy of signal light, carry out photoelectric signal conversion;Amplify converted electrical signal, carry out electrical mixing in mixer, output intermediate frequency signal;Low-pass filter processing is carried out to intermediate frequency signal;In signal processing system, intermediate frequency signal is converted into pulse square wave by high-speed comparator, carries out capacitance analog interpolation processing, measures intermediate frequency signal period, calculates intermediate frequency signal frequency value.The application solves the technical problem that the counting error of ±1 word leads to the period of to-be-measured intermediate frequency signal, the distance calculation precision of detection target is low.

The invention discloses a fault detection and fault-tolerant control strategy for a modular multilevel converter in an MVDC ship, and belongs to the technical field of power electronics, and the fault detection and fault-tolerant control strategy comprises the following steps: S1, carrying out capacitor voltage estimation based on a Luenberger observer; s2, performing fault detection on each sub-module by using an SM fault detection method; and S3, a balanced line voltage is obtained by injecting zero sequence voltage, so that an overmodulation phenomenon of a fault phase is avoided, and equalization control is performed on the energy of each bridge arm by adjusting circulating current. According to the fault detection and fault-tolerant control strategy of the modular multilevel converter in the MVDC ship, the fault detection process can be simplified, accurate fault diagnosis can be achieved only by setting a fixed algorithm gain coefficient, the complexity of an algorithm can be greatly simplified, the calculated amount is reduced, and the fault-tolerant operation capability is improved.

The invention relates to a non-intrusive three-level inverter phase current reconstruction method based on a fixed sampling moment, and belongs to the technical field of permanent magnet synchronous motor control. Aiming at the problems that the sampling time is not fixed, blind areas exist in a low modulation area and a sector boundary, and harmonic waves are increased due to intrusive compensation in current reconstruction of an existing three-level inverter, redundant small vectors at the starting moment and the center moment of a carrier are adopted as effective reconstruction vectors, and a single-sensor topology of a coupling phase current and a midpoint capacitance branch is designed; and a zero vector group is used for replacement in a low modulation region, so that non-intrusive fixed sampling is realized. The method covers all areas except an overmodulation area in a hexagonal space voltage vector contour, the reconstruction error is smaller than 5%, the bus utilization rate reaches 95%, a complex compensation algorithm is not needed, and harmonic and switching loss is reduced.

The invention discloses a driver and an optical module, the driver comprises a current source, the driver is connected with a modulator, and the modulator adjusts common-mode voltage Vcmn of the output end of the driver according to the magnitude of direct current provided by the current source for the driver; the driver further comprises a modulation bias circuit, and the modulation bias circuit can adjust the size of the direct current provided by the current source according to a comparison result between the common-mode voltage Vcmn of the output end of the driver and a preset voltage, so that the common-mode voltage Vcmn of the output end of the driver can be adjusted to be the same as the preset voltage through the modulator. According to the invention, the problem that the reliability and the performance of optical modules in mass production are inconsistent due to unstable common-mode voltage of the output end of the driver is solved.

The invention provides an open-winding permanent magnet synchronous motor predictive current control method based on hybrid pulse width modulation, and the method comprises the steps: calculating a reference voltage vector, dividing voltage vector sectors according to the reference voltage vector, and selecting a non-zero voltage vector and a zero voltage vector in each sector; according to the sector and range where the reference voltage vector is located, selecting a voltage vector which needs to be acted by the double inverters, and calculating the time when each inverter acts on the voltage vector by using a volt-second balance principle; if the action time of the selected voltage vector exceeds the control period, overmodulation processing is carried out, and the voltage vector time is redistributed; if the zero-sequence current is suppressed, the zero-sequence current and the zero-sequence voltage are suppressed by adjusting the action time of the zero-sequence voltage vector. The control performance of the open-winding permanent magnet synchronous motor can be improved, and the zero-sequence current of the open-winding permanent magnet synchronous motor can be suppressed.