396 results about "Frequency compensation" patented technology

The invention provides a single-tube boost PFC circuit control method and system for single-cycle control, and relates to the technical field of data processing, and the method comprises the steps: generating a self-adaptive PWM control signal according to a duty ratio adjustment amount and a frequency compensation factor, and dynamically limiting the pulse current amplitude of a power switch tube through a peak current prediction algorithm, a load current change rate is generated based on the real-time relevance between the pulse current amplitude and the load current; setting a first monitoring point in a dynamic duty ratio change path of the PWM control signal, and extracting a duty ratio change rate and a switching frequency fluctuation parameter in real time; setting a second monitoring point in a feedback path of a load current change rate, and extracting a load current slope characteristic and a transient change amplitude in real time; and based on the parameters of the first monitoring point and the second monitoring point, generating a correction factor through a dynamic response correlation model. According to the invention, a high power factor can be realized under wide input voltage and load fluctuation.

The invention relates to a multi-channel signal integrity optimization method and system for a passive copper cable, and the method comprises the steps: obtaining channel characteristic parameters and signal transmission requirements of the passive copper cable, and carrying out the impedance matching, and obtaining an optimized transmission channel; acquiring real-time transmission data of the passive copper cable, and performing equalization processing on the real-time transmission data through the optimized transmission channel to obtain a stable transmission signal; acquiring crosstalk interference data acquired by the passive copper cable, and carrying out shielding analysis on the crosstalk interference data and the optimized transmission channel to obtain a crosstalk suppression measure; performing frequency characteristic analysis on the crosstalk interference data to obtain frequency compensation information, and performing transmission prediction on the frequency compensation information based on the crosstalk suppression measure to obtain a frequency compensation parameter; and performing multi-channel optimization on the initial signal optimization result according to the frequency compensation parameter to obtain a multi-channel optimization signal. According to the invention, complex and changeable transmission environments can be coped, and stable transmission of signals is ensured.

The invention provides a porcelain insulator pulse excitation detection method based on multi-mode coupling analysis, and belongs to the technical field of intelligent detection of power equipment, and the method comprises the following steps: applying a mechanical pulse excitation signal with an adjustable amplitude; collecting a vibration response signal and constructing a temperature-frequency compensation model; separating the vibration mode of each section: constructing an equivalent mass-rigidity-damping model of a plurality of sections of insulators; extracting instantaneous frequency from the separated multi-mode signal, capturing the non-stationary characteristic of the vibration signal, and capturing the local rigidity change; and calculating a crack quantitative index and outputting a diagnosis result, including establishing a crack depth-frequency offset mapping database, and acquiring an actual bending form of the vibration mode by identifying the position of the crack. The method has the advantages that the three-dimensional characteristic spectrum of the crack is constructed through joint analysis of multi-dimensional data such as the vibration mode, the instantaneous frequency and the curvature distribution, the limitation of traditional single parameter detection is broken through, and refined distinguishing of defect property cracks, aging and the like is achieved.

The invention discloses a rapid calibration method and system for automatic testing equipment of a vehicle machine, and relates to the technical field of automatic calibration, and the method comprises the steps: inputting a preset standard calibration signal to the testing equipment, and collecting the response data of each testing channel of the equipment as calibration reference data; comparing the calibration reference data with a built-in standard reference value of the equipment, and calculating deviation data of each test channel; based on the deviation data, calibration parameters of each channel are calculated, and the calibration parameters comprise a gain compensation coefficient, a frequency compensation coefficient and a phase compensation coefficient; the calibration parameters are loaded to the corresponding channels of the test equipment, a preset standard calibration signal is input for verification test, and when errors of the channels are smaller than a preset residual error threshold value, calibration is completed, and the calibration parameters are stored. By establishing the gain-frequency-phase joint compensation model and combining the parallelization verification and increment optimization algorithm, the high-precision rapid calibration of the automatic test equipment of the vehicle machine is realized.

The invention discloses a GIS partial discharge on-line monitoring method, and relates to the technical field of power equipment monitoring and fault diagnosis, and the method comprises the following steps: a detection system carries out the real-time collection of an electrical signal caused by a partial discharge phenomenon in the operation process of GIS equipment through a high-frequency sensor disposed on the GIS equipment, therefore, a data basis for subsequent distortion analysis and positioning is obtained. Partial discharge signals are collected in real time through the high-frequency sensor, signal distortion is evaluated in combination with a machine learning model, the time domain and the frequency domain of the signals are accurately corrected by adopting a dynamic time warping algorithm and a frequency compensation means, and the real characteristics of the signals are recovered. According to the method, the signal positioning precision is improved, the GIS equipment fault detection capability is enhanced, potential risks are warned in advance, equipment faults and safety accidents are reduced, and the safety and stability of a power system are remarkably improved.

The invention relates to the technical field of voice processing, in particular to a mixed voice processing method, electronic equipment and a computer readable medium. The method comprises the following steps: collecting mixed voice and environment influence parameters; carrying out bionic frequency domain analysis on the mixed voice to obtain low-frequency attenuation compensation characteristic data; performing multipath effect propagation analysis on the low-frequency attenuation compensation characteristic data through the environmental influence parameters to generate channel distortion data; performing time domain-frequency domain joint deconvolution processing on the mixed voice by using the channel distortion data to generate a direct sound component and a reflected sound component; performing adversarial training based on the direct sound component and the reflected sound component to generate anti-multipath speech enhancement data; and constructing a dynamic frequency compensation filter based on preset environmental acoustic characteristics. Through the multi-stage signal processing, frequency compensation and real-time optimization technology, the output quality of the mixed voice is improved.

The invention relates to the technical field of arc discharge control, in particular to an arc discharge machine control method based on multi-parameter collaborative optimization, which comprises the following steps of: generating a first regulation and control instruction by adopting a fuzzy PID (Proportion Integration Differentiation) algorithm based on a deviation value between a dynamic parameter feedback signal and a preset threshold value, the axial feeding speed of the servo motor, the power output curve of the arc generator and the coolant spraying time sequence are synchronously adjusted, so that the arc energy density gradient and the workpiece heat conduction rate form dynamic balance, the mechanical resonance frequency in the machining process is monitored through the vibration spectrum analysis unit, and when it is detected that the resonance intensity exceeds a safety threshold value, the coolant spraying time sequence is started. And a second regulation and control instruction is generated by triggering a frequency compensation algorithm, and the driving frequency of the servo motor is corrected in real time, so that the control precision is improved, the arc discharge process is more stable, the response speed is increased, the arc discharge time is shortened, the adaptability is enhanced, the requirements of different materials and processes can be met, the energy consumption is reduced, and the production efficiency is improved.

The invention discloses a high-current wide-capacitance-range LDO (Low Dropout Regulator) based on a frequency compensation circuit. The LDO comprises a first-stage operational amplifier, a second-stage operational amplifier and a third-stage operational amplifier The secondary operational amplifier is used for carrying out secondary amplification on the amplified error signal; the driving circuit is used for enhancing the driving capability of the error signal subjected to secondary amplification; the current output circuit is used for adjusting the output current of the output demand according to the secondary amplified error signal with the enhanced driving capability and the input voltage; the feedback circuit is used for generating new feedback voltage according to the output current; the first-stage operational amplifier is also used for amplifying a new error signal; and the frequency compensation circuit is used for adjusting the positions of a plurality of zero poles in the new error signal according to the output current by utilizing the multi-zero pole dynamic compensation branch and the current buffer compensation branch so as to offset a secondary pole and widen the whole unit gain bandwidth at the same time to obtain an adjusted error signal. According to the invention, a large bandwidth can still be obtained in a large current output range and a large load capacitance range.

The invention discloses a low-dose CT image denoising method and system based on a conditional diffusion model, and the method comprises the steps: constructing a denoising network model, only employing a standard-dose CT image in a training process, and simulating a generation process of the standard-dose CT image through the training of the denoising network model. And abundant image priori knowledge is constructed. Meanwhile, the de-noising network model uses a U-Net encoder-decoder structure, a multi-scale cross axis attention mechanism is added in a decoder and an encoder, important image details are reserved in the de-noising process, irrelevant noise components are removed at the same time, and smooth areas and continuous boundaries of the image can be recovered. In addition, the frequency compensation block in the jump connection can compensate the insufficiency of medium-high frequency signals in the training process, so that the original structure and texture information of the image are recovered.

The invention provides a grid-connected inverter impedance detection method based on an L-shaped filter, and belongs to the technical field of grid-connected inverter impedance detection. A multi-frequency-point disturbance signal is injected into a preset grid-connected inverter working point, time domain data of inverter side current and common coupling point voltage are collected, fast Fourier transform analysis is carried out on the collected data, amplitude and phase information corresponding to each injection frequency point is extracted, and a frequency domain feature vector matrix is established; and establishing a frequency compensation matrix model to compensate and correct high-frequency band measurement data based on a frequency characteristic attenuation vector, calculating to obtain optimal estimated values of power grid impedance and grid-connected inverter output impedance, performing error analysis and precision verification on an impedance detection result, and outputting a verified impedance parameter value. The technical problem of insufficient power grid impedance detection precision caused by high-frequency band attenuation of the L-shaped filter is solved.

The invention discloses a temperature drift compensation method for a miniature crystal oscillator chip, and particularly relates to the field of temperature drift compensation for electromagnetic interference signal measurement, which comprises the following steps of: arranging a double-shaft Hall sensor array around a temperature sampling channel of the miniature crystal oscillator chip, and carrying out spatial distribution acquisition on a low-frequency electromagnetic field in a chip operation environment; generating an electromagnetic disturbance signal for representing a parasitic electromagnetic interference behavior; and pilot frequency convolution processing is carried out on the electromagnetic disturbance signal and a thermal response signal obtained in a temperature sampling channel, coupling response characteristics related to an electromagnetic interference behavior are extracted, and a spectrum fitting template of an electromagnetic parasitic injection behavior is constructed. A low-frequency electromagnetic disturbance sensing channel is synchronously introduced outside a temperature sampling path, and an interference identification, stripping and compensation dynamic linkage mechanism is constructed to realize active detection and correction of latent electromagnetic interference components in a temperature response signal, so that the problems of frequency compensation error and long-term offset accumulation in the prior art are solved.

The invention relates to the technical field of micro-grid control, and provides an island micro-grid distributed control method, system and device and a storage medium. Comprising the following steps: performing voltage compensation gain and frequency compensation gain calculation based on droop control output of each distributed power generation unit, droop control output of all neighbor distributed power generation units, and a voltage dynamic tracking error and a frequency dynamic tracking error which are obtained by calculating a microgrid global recovery target to obtain secondary adjustment output; and after corresponding items in the droop control output and the secondary regulation output are summed to generate comprehensive reference output, voltage synthesis is carried out according to the comprehensive reference output to obtain voltage regulation output for output control of a corresponding inverter. Based on a distributed regulation and control mechanism for cooperatively calculating the compensation amount of each power generation unit by using neighbor information and a global recovery target, the dynamic response speed and the power distribution precision can be improved, voltage drop and frequency deviation caused by load disturbance are effectively eliminated, and rapid recovery is realized.

The invention discloses a parallel converter cooperative grid-connected control method and device based on a fuel cell power generation grid-connected system, and the method comprises the steps: generating a PWM drive signal of a converter through employing a droop control strategy and a sliding mode control strategy when the converter of each power generation unit operates; operating data of each power generation unit and the health state of the fuel cell are collected in real time, information interaction data of adjacent power generation units are combined, and voltage and frequency compensation values of each power generation unit are calculated and used for conducting primary correction on the PWM driving signal; the amplitude deviation between the frequency, the voltage and the phase angle at the common coupling point of the alternating current bus of the power grid and each power generation unit is obtained in real time, a trigger instruction used for controlling switching of a grid-connected mode and an island mode is generated based on the deviation, and a synchronization item is generated based on the deviation in the grid-connected mode and used for conducting secondary correction on the PWM driving signal. The method can improve the stability and operation efficiency of the system, and ensures that the system is stably switched between the grid-connected mode and the island mode.

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.

The invention provides a crystal oscillator monitoring method and system based on a multi-sensor network. The method comprises the following steps: acquiring operation environment data of the quartz crystal oscillator, monitoring an output signal of the quartz crystal oscillator, and acquiring output frequency and time for measuring the crystal oscillator in each batch; calculating the daily frequency change rate of the quartz crystal oscillator, and establishing an aging linear regression equation of the quartz crystal oscillator through a least square method based on the operation environment data, the output frequency, the daily frequency change rate and the time; and predicting an output frequency prediction value of the quartz crystal oscillator based on the aging linear regression equation, and performing frequency compensation on the quartz crystal oscillator according to the difference between the output frequency prediction value and a target frequency prediction value. Through the method and the corresponding system, the frequency stability and the anti-interference capability of long-term operation of the quartz crystal oscillator system and the overall operation reliability of the terminal equipment can be greatly improved.

The invention discloses a frequency voltage decoupling control method and a frequency voltage decoupling control system under a fault of a hybrid wind power plant, and belongs to the technical field of wind power generation. First voltage compensation is added to the following net type draught fan and the net constructing type draught fan through the frequency adjusting parameters and the current active power variable quantity; when only the active voltage support is started, first frequency compensation is added to the following net type draught fan and the construction net type draught fan through the voltage adjusting parameters and the current reactive power variable quantity; and when the active frequency support and the active voltage support are started at the same time, adding second voltage compensation and second frequency compensation to the following grid type fan and the constructing grid type fan by using the frequency adjustment parameter, the voltage adjustment parameter, the current active power variable quantity and the current reactive power variable quantity. According to the scheme, active and reactive feed-forward decoupling is carried out on the following / constructing network type fan through decoupling compensation control, and the interaction influence in the frequency voltage supporting process is restrained.

The invention provides a time synchronization method based on an IEEE 1588 protocol, and relates to the technical field of time synchronization. Comprising the following steps: firstly, establishing a network-based master-slave clock model to characterize a clock frequency; secondly, acquiring a timestamp set of master and slave clocks of the current round, and calculating average transmission delay and time offset; thirdly, a clock synchronization equation of Kalman filtering is built based on a clock model, time offset and drift serve as input, an optimal time offset value is obtained, and a local clock is adjusted to complete synchronization of the current round. Then, a new timestamp set is obtained for the next round, the average transmission delay and the time offset are calculated, and the optimal offset value is determined through a Kalman filtering equation; meanwhile, the number of cycles is calculated according to the offset value and the receiving timestamp, and frequency compensation is carried out on the slave clock. According to the invention, the problem of low time synchronization precision in the prior art is effectively solved.

The invention relates to the technical field of signal processing, in particular to a microseismic sensor front-end signal conditioning circuit based on lag correction frequency expansion. The microseismic sensor front-end signal conditioning circuit based on lag correction frequency broadening comprises a differential amplification circuit used for converting a differential signal input by a microseismic sensor into a single-ended vibration signal and carrying out pre-amplification processing on the vibration signal according to a preset gain to obtain an amplified vibration signal; and the filtering and lag correction circuit is used for widening the frequency range of the amplified vibration signal in a filtering and lag correction mode to obtain a conditioned vibration signal. According to the invention, frequency expansion can be carried out on the magnetoelectric sensor through a low-frequency compensation technology, and the response capability of the magnetoelectric sensor to a low-frequency signal is improved.

The invention discloses a hysteresis compensation system and method for low-frequency compensation of a magnetoelectric vibration sensor. The compensation system comprises a difference to single-end circuit, a second-order lag compensation circuit, a single-chip microcomputer, an ADC conversion module, a first-order high-pass filtering module and a second-order low-pass filtering module which are sequentially connected with the magnetoelectric vibration sensor. The differential-to-single-end conversion circuit receives voltage signals output by the magnetoelectric vibration sensor and converts the voltage signals into single-end electric signals, the second-order lag compensation circuit receives the single-end electric signals of the differential-to-single-end conversion circuit for low-frequency compensation, the single-chip microcomputer receives low-frequency compensation signals, the ADC conversion module converts the low-frequency compensation electric signals into digital signals, and the digital signals are transmitted to the magnetoelectric vibration sensor. The first-order high-pass filtering module filters noise with the frequency lower than f1 out of the digital signals, and the second-order low-pass filtering module filters noise with the frequency higher than f2 out of the digital signals output by the first-order high-pass filtering module. According to the invention, the amplitude response of the magnetoelectric vibration sensor during low-frequency signal measurement can be improved.

The invention discloses a parallel constant-voltage digital audio power amplifier and a broadcasting system. Comprising a line input module, a line output module, a first analog-to-digital conversion circuit, a second analog-to-digital conversion circuit, a third analog-to-digital conversion circuit, a digital signal processor, a single-chip microcomputer, a digital-to-analog conversion circuit, an error comparator, a modulator, an integrating circuit, a pulse width modulation input half-bridge output stage, and a first carrier frequency selection and gain adjustment module. A second carrier frequency selection and gain adjustment module, a first LC filter, a high-frequency compensation network, a communication bus and a power switch. The technical problems that an existing multi-channel parallel digital constant-voltage power amplifier is only limited to power amplifier channels in the same power amplifier, the parallel connection mode only uses the first channel as a main power amplifier and only uses the other channels as slave power amplifiers, and certain limitation exists are solved.

The present application relates to the technical field of speech processing, and particularly relates to a mixed speech processing method, an electronic device and a computer readable medium. The method comprises the following steps: collecting mixed speech and environmental influence parameters; performing bionics frequency domain analysis on the mixed speech to obtain low-frequency attenuation compensation feature data; performing multipath effect propagation analysis on the low-frequency attenuation compensation feature data through the environmental influence parameters to generate channel distortion data; performing time domain-frequency domain joint deconvolution processing on the mixed speech by using the channel distortion data to generate direct sound components and reflected sound components; performing adversarial training based on the direct sound components and the reflected sound components to generate anti-multipath speech enhancement data; and constructing a dynamic frequency compensation filter based on preset environmental acoustic characteristics. The present application improves the output quality of mixed speech through multi-stage signal processing, frequency compensation and real-time optimization technology.

The invention relates to the technical field of semiconductor integrated circuits, and provides a low-dropout linear voltage stabilizing circuit which comprises a power transistor, a current feedback circuit, an error amplifying circuit and a driving circuit. The first end of the power transistor receives an input voltage, and the second end of the power transistor provides an output voltage; the current feedback circuit samples the current flowing through the power transistor and generates a current feedback signal representing the current flowing through the power transistor; the error amplification circuit receives a voltage feedback signal representing an output voltage, and amplifies a difference value between the voltage feedback signal and a reference voltage signal so as to output an error signal at an output end of the error amplification circuit; the first end of a first transistor of the driving circuit receives a current feedback signal, the control end of the first transistor receives an error signal, and the first end of the first transistor serves as the output end of the driving circuit and is coupled to the control end of the power transistor. The low-dropout linear voltage stabilizing circuit can realize frequency compensation, increase bandwidth and improve stability.

The invention discloses a multi-loop anti-interference ride-through control system and method for a high-voltage three-level inverter, and is suitable for a three-phase T-type three-level grid-connected inverter. The system comprises a direct current side power supply circuit, an inversion main circuit, a filtering grid-connected circuit, a signal sampling and conditioning circuit, a multi-loop cooperative controller and a PWM driving and protecting circuit. According to the control method, a robust synchronous reference is provided through an outer ring virtual synchronous generator strategy; a middle ring adopts a virtual impedance model containing a high-frequency compensation item to selectively suppress switching noise; the inner ring adopts a quasi-proportional resonance controller to realize fundamental current zero-static-error tracking; the modulation layer dynamically optimizes a discontinuous pulse width modulation strategy based on a real-time EMI index; and the rings are switched to a low-voltage ride-through mode in cooperation when a fault occurs. On the premise of not increasing hardware, the anti-interference capability, the current quality and the ride-through stability of the inverter under the working conditions of strong electromagnetic interference and power grid drop are effectively improved.

The invention relates to the technical field of audio signal processing, and provides a self-adaptive frequency compensation system for small-sized multichannel sound equipment and a control method thereof, and the self-adaptive frequency compensation system for the small-sized multichannel sound equipment comprises an audio signal acquisition module, a frequency analysis module and a dynamic filtering compensation module which are electrically connected with one another in a communication manner; the audio signal acquisition module is used for acquiring an audio signal at a preset sampling rate through the ADC module; the frequency analysis module is used for executing FFT (Fast Fourier Transform) on the acquired audio signals to calculate energy distribution of corresponding frequency bands and identify missing or attenuated frequency ranges; and the dynamic filtering compensation module is used for selecting an FIR (Finite Impulse Response) or IIR (Infinite Impulse Response) filter according to a frequency analysis result, dynamically adjusting a filter coefficient and a gain value, performing real-time filtering processing on the audio signal and outputting a compensated audio signal. The missing frequency is identified and compensated by performing analysis, filtering, equalization and other processing on the audio signal.

A voltage regulator includes an input power supply node, an output regulated power supply node, a flipped voltage follower circuit, and a compensation capacitor. The flipped voltage follower circuit includes an output transistor configured as a common-source amplifier circuit. A source terminal of the output transistor is coupled to the input power supply node and a drain terminal of the output transistor is coupled to the output regulated power supply node. The flipped voltage follower circuit includes a folded cascode feedback circuit. The folded cascode feedback circuit includes a folding node. The folded cascode feedback circuit is configured to receive an output regulated voltage on the output regulated power supply node and to provide a feedback signal to a gate terminal of the output transistor. The compensation capacitor is coupled to the output regulated power supply node and the folding node.

The invention provides a method for improving transient stability of a submarine direct-current power supply system based on frequency compensation. The method comprises the following steps: acquiring a real-time electrical parameter detection item of a first system; based on the first system real-time electrical parameter detection item, judging whether the system load power is within a power range required by a transient stable operation condition; if not, the switching frequency compensation amount of the input-series output-parallel resonant converter sub-module is calculated; based on the switching frequency compensation amount, determining a switching signal of a sub-module switching tube of the input-series output-parallel resonant converter; acquiring a real-time electrical parameter detection item of a second system; based on a second system real-time electrical parameter detection item, judging whether the system load power is within a power range required by a transient stable operation condition; if yes, conventional frequency conversion control is adopted. The technical blank in the field is effectively filled, and the stability of the submarine direct-current power supply system in the transient process is remarkably improved.

The invention belongs to the technical field of energy storage converter control, and discloses a network construction type energy storage converter pre-synchronization control method based on virtual impedance and inertia compensation, and the method comprises the following steps: 1, obtaining parameters; 2, virtual instantaneous reactive power Qv is calculated; 3, calculating an energy storage grid-connected pre-synchronization frequency compensation amount omega v; 4, calculating the voltage amplitudes of the two sides of the bus-side circuit breaker BRK1; step 5, calculating the pre-synchronization voltage compensation amount of the network construction type energy storage grid connection; 6, frequency and voltage compensation feed-in control is carried out; step 7, determining a network construction type energy storage grid-connected condition; step 8, designing a first-order inertial link to slow down jump; and step 9, quitting pre-synchronization. After the pre-synchronization control method provided by the invention is adopted, when a line has a fault, rapid and stable grid connection of network construction type energy storage can be realized, and the reliability of grid connection after the fault is recovered and the transient stability of the system are remarkably improved.

The invention relates to the technical field of power grid switching, and provides a grid-connected and off-grid seamless smooth switching method and device, electronic equipment and a storage medium thereof. The method comprises the following steps: acquiring a power grid phase angle and dq-axis voltage in real time through SRF-PLL phase locking, performing Clarke-Park conversion on VSG output current, and calculating active power and reactive power; based on the power deviation, the virtual inertia and the damping coefficient, dynamic optimization is carried out to obtain self-adaptive inertia and damping; performing secondary voltage compensation by combining the dq-axis voltage amplitude difference and the real-time reactive power to generate excitation voltage; frequency compensation is realized by using a phase difference and a dynamic phase tracking model; a switching instruction is generated through multi-threshold judgment, linear transition is conducted on reference current and reactive power through a transition function during switching, a non-jump current instruction is output, and grid-connected and off-grid seamless switching is achieved by closing PWM. According to the invention, grid-connected and off-grid seamless switching and high-precision voltage frequency control are realized through multi-threshold judgment, soft-closed PWM and the like.

A cascade amplification circuit module based on complementary parameter amplifiers belongs to the technical field of integrated circuit amplifiers and comprises a first-stage complementary parameter amplifier (CPA) and a second-stage amplifier (floating inverting type or transconductance resistance type). The first-stage CPA adopts an NMOS and PMOS complementary structure, passive amplification is achieved through grid multiplexing, a grid capacitor is used for storing signals in the sampling stage, a depletion layer capacitor is switched to improve gain in the amplification stage, common-mode voltage is stabilized through complementary design, and an extra feedback circuit is not needed. And the second-stage amplifier provides driving capability and is combined with passive gain to suppress noise. The cascade structure does not need frequency compensation, the design is simplified, the problem of balancing gain, noise and power consumption of a traditional amplifier is solved, and the cascade amplifier has the advantages of being high in energy efficiency and low in complexity.

The present invention relates to a leakage current suppression system for an alternating-current power system. The leakage current suppression system comprises: a variable-frequency compensation control module, which regulates the frequency and signal amplitude in a circuit on the basis of an equipotential feature of a consumer loop of a power system, in order to match load characteristics and achieve dynamic signal amplitude fixation; a real-time monitoring module, which is used for monitoring the frequency, current and voltage of the power system; a central processing unit, which processes data from the monitoring module, and executes data analysis to identify frequency and current variations in the case of current leakage or electric shock; and a leakage current suppression module, which is connected to the real-time monitoring module and is configured with a mechanism which is automatically activated when frequency and current abnormalities are detected, and is used for dynamically adjusting a circuit response to suppress a leakage current. The modules are connected in parallel to the consumer loop, perform rapid adaptive tuning compensation for the parallel frequency resonance in a load loop, and dynamically regulate the current phase and amplitude, so that a zero potential difference at a target load end and current suppression for a target load are achieved, and a suppression and shielding effect on circuit leakage is achieved.