73 results about "Overshoot (signal)" patented technology

An audio peak limiter in which the lower sideband of the modulation distortion spectrum is canceled. The peak limiter is realized by multiplying the input signal by a control signal. The Hilbert transform of the control signal is multiplied by the Hilbert transform of the input signal and the outputs of the two multipliers are added. This cancels the lower sideband of the modulation process. Various filters can be added to eliminate aliasing in digital realizations, to band-limit the output signal, and to control peak overshoot.

The invention discloses a method for evaluating the control performance of a PID (Proportion Integration Differentiation) loop based on subspace identification. The method comprises the following steps of: effectively segmenting a controller output signal u and a process output signal y according to the loop opening and closing states of a PID loop controller and the upper and lower limit constraints of the controller output signal u; solving a random system model by using a subspace identification algorithm; calculating a moment performance index and a performance index sequence at the reach of steady-state time according to the sampling time of the controller output signal u and the process output signal y, set PID loop steady-state time and desired time; and detecting oscillation in the loop according to a model obtained by using space identification and a self-correlation function of the process output signal y. The random system model is established by using the subspace identification, so that setting of a system order is avoided. By adopting the method, loop related information including 95 percent of steady-state time, 95 percent of dynamic time, overshoot and a peak moment is given by making full use of the model obtained by the identification. The performance index is calculated by using reference time set by a user, and is accordant with the practical situation of the PID loop.

The invention discloses an optimization control method based on self-adaptive virtual inertia parameters. The method comprises the following steps of: 1, acquiring a frequency change rate and a frequency offset of a grid-connected point of a system, and obtaining a virtual inertia coefficient by combining values of an anti-misoperation coefficient and a symbol item according to a corresponding criterion; 2, superposing an additional active instruction with a real-time power instruction issued by a fan master controller to obtain a total active instruction; 3, inputting the deviation value of the total active instruction and the fan active detection value into a PI regulator to obtain active and reactive current instructions; and 4, comparing the active and reactive current instructions with the actual active and reactive current, and respectively inputting the obtained current deviations into the PI regulator to obtain active and reactive voltage instructions, so that modulation is carried out by an SVPWM link, and a machine-side converter switching tube control signal is generated. According to the invention, the virtual inertia coefficient of the system can be smoothly adjusted according to the frequency fluctuation of the grid-connected point, thereby reducing the overshoot and adjustment time of the frequency response, and optimizing the inertia support capability of the system.

The invention provides an electrocardiosignal denoising method based on improved EMD (Empirical Mode Decomposition) and threshold method fusion, and belongs to the technical field of signal wave filtering. The mode mixing problem is solved by adding white noise with different weight coefficients. The end point problem is solved by a method of a least squares support vector machine. Signal upper and lower envelope lines are constructed by a conformal spline interpolation method; and cubic spline interpolation with second-order approximation accuracy, few segments and small calculation quantityis constructed by a conformal segmentation method. The method can be used for inhibiting the envelope fitting overshoot / undershoot problem; IMF (Intrinsic Mode Function) component sieve termination criterion is provided by the decomposed IMF orthogonality and energy properties; the orthogonality and completeness of the EMD are ensured; the amount of noise contained in the sieved IMF signals is judged through a mutual information principle, whether the filtering processing is needed or not is determined, and the high speed of an EMD algorithm is accelerated; a threshold function is improved;the threshold function combines with the advantages of soft-hard thresholds; and the filtering processing is performed on IMF containing the noise.

The invention provides a spacecraft rapid maneuvering attitude tracking adaptive robust control method, which adopts a tracking differentiator to calculate the transition process of reference input and give the differential of the reference input, and solves the contradiction between the overshoot and rapidity of the system by arranging a proper reference signal transition process. The design of the controller is based on a cooperative control method, the problem of intrinsic discontinuity of sliding mode variable structure control is solved, the optimization of performance indexes is achieved, the cooperative control method combines the advantages of sliding mode control and optimal control, and meanwhile the buffeting phenomenon generated by discontinuity in sliding mode variable structure control is improved. Furthermore, based on self-adaptive control, the problem of spacecraft rotational inertia uncertainty and the problem of interference suppression are solved, and spacecraft rapid maneuvering attitude tracking self-adaptive robust high-precision control under the interference condition is achieved.

A method for assessing a ripple of a signal, includes: a) determining a first signal value at a determination point in time, b) determining a signal value difference between the first signal value and a signal value determined at a previous determination point in time, c) incrementing an undershoot counter if the signal value difference falls below a first difference threshold value, and incrementing an overshoot counter and resetting the undershoot counter if the signal value difference exceeds a second difference threshold value, and d) determining that no ripple overshoot is present and resetting the overshoot counter if the undershoot counter overshoots an undershoot threshold value, and determining that a ripple overshoot is present if the overshoot counter exceeds an overshoot threshold value and the undershoot counter does not exceed an undershoot threshold value.

A fast response amplifier circuit includes a pre-stage circuit and an output stage circuit. The pre-stage circuit generates a control signal according to a difference between a first input signal and a second input signal. The output stage circuit generates an output signal at an output node according to the control signal. The output stage circuit includes: a power transistor controlled by a driving signal to generate the output signal; a voltage positioning transistor operates according to the output signal to steer a first portion and a second portion of a bias current; an overshoot detecting circuit detecting an overshoot of the output signal to generate an overshoot indicating signal; and a first overshoot suppressor which generates a first overshoot suppressing signal according to the overshoot indicating signal to adjust a conduction resistance of the power transistor to suppress an overshoot of the output signal.

The invention discloses a band-gap reference voltage high-speed powered anti-overshoot circuit comprising a main circuit, a startup module, an output module and a filter delay control module. The band-gap reference voltage high-speed powered anti-overshoot circuit provided by the invention filters out the overshoot current generated at the startup stage through the filter delay control module, converts the overshoot current into a voltage signal after the delay, detects the voltage signal by using a single-stage amplifier, and finally controls the output module to weaken or eliminate the overshoot of the output voltage and make the output voltage stable. In addition, the single-stage amplifier is used as the threshold detection circuit in the filter delay control module, and compared withthe inverter, the single-stage amplifier has the advantages such as high magnification factor, high detection accuracy and low dynamic power consumption. Moreover, since the eleventh switch tube is connected by a current source and its gate voltage is constant, the influence of the change of the threshold voltage caused by the process deviation on its detection accuracy can be ignored.

An inverter control system based on active disturbance rejection control theory, which is composed of a sampling circuit, a drive circuit, an ADRC controller, an I / O conversion module and a PWM generator; its control method is: establish a control quantity model, collect The signal is sent to the ADRC controller, the control law is obtained, and the control signal is output; its advantages are: 1. It has good control quality for nonlinear and complex systems, and has good anti-interference ability; 2. Small overshoot , The transition process is short, it can adapt to the changes of the object model and the surrounding environment in a wide range, and does not affect the control quality of the controller, and has good robustness.

The invention discloses a digital loop compensator of a flyback switching power supply. With the rapid development of electronic technology, the integration of switching power supply is getting higherand higher. The compensator design of digital switching power supply is a key technology in the design of switching power supply controller. The realization method and algorithm optimization of digital compensator have a direct impact on the control accuracy and ripple coefficient of switching power supply. The invention mainly relates to an S-domain small signal model of a digitally controlled flyback circuit closed-loop system, wherein the closed-loop loop in the model is divided into several main parts: a power conversion stage Gs (s), a sampling Gad (s), a digital compensator Gc (s), anda DPWM generator Gdpwm (s). As that digital loop compensator of the invention can overcome the defect that the transient control characteristics are relatively poor in the prior art and the like, theintegral separation PID algorithm is adopt, not only the response time of the system is improved, but also the overshoot of the system is reduced.

The invention relates to a three-phase phase-locked loop control structure based on virtual synchronous damping control, which is characterized in that a frequency deviation feedback channel is addedin the PI control process in the three-phase phase-locked loop control structure, and the frequency deviation output by PI is used as a feedback signal to be transmitted back to the input end of a PIcontroller. The invention further provides an alternating-current microgrid transient stability improving method based on virtual synchronous damping control, and a controller of a power grid following converter in the alternating-current microgrid is designed based on a d-q synchronous rotating coordinate system, wherein the Park transformation and inverse transformation rotation angle [theta]pllis obtained by observing the bus end voltage of the microgrid through a three-phase phase-locked loop control structure. The equivalent damping of the phase-locked loop can be increased under the condition that the steady-state performance of the phase-locked loop is not changed, so that the overshoot in the transient process is reduced, and the transient stability of the alternating-current microgrid is improved.

A method and device for the generation of a random signal, comprising: A first step (a) for the generation of a pseudo-random signal, a second step (b) for the filtering (F1) of the signal coming from the step (a) to obtain a signal x(t) having a predetermined spectral envelope H(f), a third step (c) in which a non-linear finction g is applied to the signal x(t) so as to form a signal y(t) and create overshoots on the edges of the histogram of the signal y(t), a fourth filtering (F2) step (d) used to smoothen the overshoots of the histogram of the signal y(t), compensate for the effect of the non-linearity and carry out an additional filtering at (F1). Application to a system of analog-digital conversion or digital-analog conversion.

The invention is suitable for the technical field of electronic circuits, and provides a signal overshoot analysis method and device. The signal overshoot analysis method comprises the following steps: drawing a voltage oscillogram of a signal; obtaining a capacitance value between a chip port and a ground wire, and obtaining a resonant frequency of a signal according to the voltage oscillogram; calculating an inductance value when the chip port is in short circuit with the ground wire; and calculating an overshoot current value according to the inductance value. According to the invention, detailed and systematic analysis is carried out on signal overshoot parameters, an effective analysis method is provided for signal overshoot, parameters of the buffer circuit are configured according to the overshoot parameters, and the influence of signal overshoot on chip functions is avoided.

Provided is an audio-signal dynamic-range-compression system. An input line accepts an input signal. A filter set coupled to the input line divides the input signal into a set of frequency bands, including a first frequency band and a second frequency band. A compressor has a first input that receives the first frequency band, a second input and an output. An adder has a first input coupled to the output of the compressor, a second input coupled to the second frequency band, and an output. An overshoot estimation module has an input coupled to the output of the adder and an output coupled to the second input of the compressor. The output of the overshoot estimation module provides an overshoot signal that indicates a result of a comparison between a signal at the input of the overshoot estimation module and a specified threshold.

A high-precision control method for a three-axis inertially stabilized platform based on an internal model principle and a self-adaptive time-varying bandwidth observer relates to the design of a composite controller of the internal model principle and the self-adaptive time-varying bandwidth observer. The method comprises the following steps: firstly, designing a servo compensator and a stability compensator according to a common instability model of reference input and disturbance signals of the triaxial inertially stabilized platform, and realizing suppression of constant values with known structural characteristics and frequencies and harmonic interference, so as to achieve zero-static-error control; and secondly, according to the state equation of the three-axis inertially stabilized platform, constructing the self-adaptive time-varying bandwidth observer, estimating residual structural characteristics, interference with unknown frequency and random interference in real time, and realizing high-precision control of the three-axis inertially stabilized platform in a complex environment while ensuring rapidity and small overshoot. The method has the advantages of being good in real-time performance, fast in dynamic parameter response, high in multi-source interference adaptability and the like, and can be used for high-precision control and the like of the three-axis inertially stabilized platform in the complex multi-source interference environment.

The invention belongs to the field of solid-state microwave power amplifiers, particularly provides a method and circuit for improving the power amplifier overshoot suppression efficiency under the same trigger signa and a power amplifier, and aims to solve the problem that the power amplifier is low in stability or efficiency. The part, in front of a microwave excitation signal, of the pulse power amplifier works in a high-efficiency class B; the falling edge detection circuit is used for detecting the falling edge of an excitation signal of the power amplifier; before the falling edge of theexcitation signal arrives, the grid voltage control circuit is used for adjusting the grid bias voltage, the working type of the power amplifier is changed, and the grid bias voltage is adjusted to the type A, so that the power amplifier works in the type A at the moment of the falling edge of the excitation signal, and the drain voltage does not generate overshoot at the moment of closing the microwave excitation signal. The high stability of the A-type pulse power amplifier and the high efficiency of the B-type pulse power amplifier can be obtained at the same time.

The invention discloses a bidirectional buck-boost converter control method based on a reduced-order active-disturbance-rejection strategy. The method comprises the steps of sampling an output voltage uC of a bidirectional buck-boost converter, enabling the output voltage uC to pass through an extended state observer in an outer-loop active-disturbance-rejection controller, comparing the output voltage uC with a reference output voltage value of a tracking differentiator, and obtaining an error; enabling the error to pass through a nonlinear control law in the outer-loop active-disturbance-rejection controller, and compensating an external disturbance signal in the extended state observer to obtain an inner-loop current reference value iL_ref; and enabling the inner-loop current reference value to be subjected to inner loop model prediction control processing to obtain a PWM duty ratio d, and then driving a switching tube to work by using the PWM duty ratio d. According to the bidirectional buck-boost converter control method based on the reduced-order active-disturbance-rejection strategy provided by the invention, when the bidirectional buck-boost converter is controlled, the complexity of an active-disturbance-rejection controller is reduced by performing reduced-order simplification on a control object at a high frequency band; and when the bidirectional buck-boost converter is controlled, an ADRC + MPC double-closed-loop structure is adopted, compared with a PI + MPC control strategy, the method has the advantages of being high in response speed and small in overshoot and fluctuation amplitude in the adjustment process, and the dynamic response performance of the bidirectional buck-boost converter is remarkably improved.

The invention discloses a control circuit based on operational amplifiers, and the circuit comprises a main control unit which comprises a plurality of first operational amplifiers and a plurality offirst MOS tubes, wherein the first operational amplifiers are used for driving the first MOS tubes according to an input signal VIN and a feedback signal VFB, so as to generate an output voltage signal VOUT; a feedback unit; a load; and an auxiliary control unit which comprises a plurality of second operational amplifiers and a plurality of second MOS tubes, wherein the second operational amplifiers and the second MOS tubes are used for driving the first MOS tubes according to the input signals VIN and the feedback signals VFB to generate output voltage signals VOUT; the offset voltage Voffset2 of the second operational amplifiers is greater than the offset voltage Voffset 1 of the first operational amplifiers. Through the combination of the main control unit and the auxiliary control unit, only the main control path works when the load is stable, and the auxiliary control path works prior to the main control path when the load suddenly changes, so that the response speed of the control circuit is greatly improved, and the undershoot or overshoot phenomenon of the output voltage is effectively solved.

The invention discloses a quick turning method for photoelectric equipment by combining bang-bang control and overshoot-free predictive control. According to the method, the advantage that bang-bang control is high in large-range turning speed is combined, and no-overshoot prediction control is used in the turning process, so that the turning time of the system is shortened, and the target capturing state and the tracking state can be stably switched. The system receives a guide signal and controls a driving motor to turn with the maximum driving force through bang-bang, and when approaching the target, the system is switched to non-overshoot prediction control to quickly approach the target and meet a target capture condition. According to the method, the system is optimized from the minimum time control problem; the advantage that the bang-bang control is high in turning speed in a large range is brought into full play; the characteristics that the system can quickly enter a steady state within limited time without overshoot prediction control energy are utilized, so that oscillation is not generated when the position of the system enters an error band; the advantages of the twocontrol methods are complementary; and the whole-process turning speed and stability of the photoelectric equipment are improved under the condition that the cost is not increased.

The invention discloses a radar control module and a using method thereof. The control module comprises an FPGA module and a modulation module. The FPGA module is used for converting one path of TTL level input signal into n paths of TTL level output signals; the modulation module receives n paths of TTL level output signals transmitted by the FPGA module and controls the output signal Vd throughthe signals; an amplification module receives an output signal Vd of the modulation module and controls power amplification through the signal; and the phase of the output signal Vd is controlled by controlling the time sequence of the input TTL level input signal, so that an amplified signal without overshoot and with symmetrical leading edge and trailing edge is obtained, the frequency spectrumbandwidth occupied when the radar works in a saturated state is reduced, and the frequency spectrum resources are saved.

An overshoot amount detection method includes a synchronization step of synchronizing a signal of an inertial sensor with a signal of an encoder based on a first synchronizing signal output from the inertial sensor during a signal synchronizing operation and a second synchronizing signal output from the encoder during the signal synchronizing operation, a signal generation step of generating a first signal by twice integration of a first detection signal output from the inertial sensor during a working operation and removal of a low-frequency component contained in the first detection signal and generating a second signal for supplement of the low-frequency component of the first signal from a second detection signal output from the encoder during the working operation, and an overshoot amount detection step of detecting an overshoot amount of an arm based on the first signal and the second signal.

The present invention relates to a method for processing a digital signal through a non-linear device. The digital signal makes a first transition from a first level to a second level. The method comprises a step of pre-emphasizing the digital signal; and a step of processing the pre-emphasized digital signal by the non-linear device. The step of pre-emphasizing the digital signal includes pre-emphasizing the digital signal by applying an undershoot to the first level before the first transition, when the first level is lower than the second level; and / or pre-emphasizing the digital signal by applying an overshoot to the first level before the first transition, when the first level is higher than the second level. The present invention also relates to an apparatus using the above method.

The invention belongs to the field of solid-state microwave power amplifiers, relates to an excitation signal triggered power amplifier overshoot suppression efficiency improvement method, a circuit and a power amplifier. The problem that a power amplifier is low in stability or efficiency is solved. The part, in front of a microwave excitation signal, of the pulse power amplifier works in a high-efficiency class B; before the falling edge of the excitation signal arrives, the grid voltage control circuit is used for adjusting the grid bias voltage, the working type of the power amplifier is changed, and the grid bias voltage is adjusted to the type A, so that the power amplifier works in the type A at the moment of the falling edge of the excitation signal, and the drain voltage does notgenerate overshoot at the moment of closing the microwave excitation signal.

The invention discloses an active oscillation suppression method for a grid-connected VSG. The method comprises the following steps: acquiring grid-connected data information of a grid-connected side in real time; performing reactive droop control to obtain a reactive control output quantity; calculating electromagnetic power output by the VSG and performing active droop control to obtain an active droop control quantity; performing transient feedback power compensation by adopting a lag link and a compensation link to obtain a transient feedback power compensation control quantity; performing virtual inertia control to obtain an active control output quantity; performing voltage and current double-loop control to obtain a PWM control signal; and controlling the grid-connected VSG by adopting a PWM control signal to complete grid-connected VSG control and active oscillation suppression. According to the invention, transient feedback power compensation is carried out by adding a lag link and a compensation link on a control loop, and innovative grid-connected VSG control is combined, so that active oscillation suppression of the grid-connected VSG is realized, the overshoot of grid connection is small, and the grid connection performance is more stable and reliable.

The invention belongs to the technical field of flow control, and particularly relates to an adjusting type electric execution method and mechanism based on flow control. The method comprises the following steps: acquiring a flow regulation signal sent by a DCS (Distributed Control System); the flow adjusting signal is obtained by the DCS according to the actual detection flow of the pipeline and the required flow of the pipeline; obtaining the valve adjusting direction according to the flow adjusting signal, and calculating the valve adjusting speed according to the valve adjusting time; and the valve opening and closing angle of the electric actuating mechanism is adjusted according to the valve adjusting direction, the valve adjusting time and the valve adjusting speed. According to the invention, the response speed of the electric actuating mechanism is accelerated, and the situation of system delay is reduced; meanwhile, the electric executing mechanism has a PID fuzzy algorithm, the opening degree of the valve is automatically controlled according to a flow control adjusting instruction and the actual flow amount of the pipeline, the conditions of adjusting oscillation, overshoot and the like can be effectively avoided, the adjusting speed is high, and the adjusting precision is high.

An overshoot amount detection method includes a first step of generating a first signal from a first detection signal output from an inertial sensor that detects inertia in a working unit of an arm to be displaced, a second step of generating a second signal using a second detection signal output from an encoder that detects an amount of displacement of the arm, and a third step of detecting an overshoot amount of the arm based on a third signal obtained by synthesis of the first signal and the second signal. The first step includes twice integration of the first detection signal and removing a low-frequency component contained in the first detection signal.

The invention discloses an overshoot suppression method. The method comprises the following steps: sampling speed inflection points of a system operation step response trajectory and a step response curve in an ascending stage; and then designing an input signal: firstly accessing a step signal, and then accessing a curve of an anti-phase step response overshoot section at an overshoot point, preferably at an inflection point, so that the actual effect of overshoot suppression can be realized by taking the curve as an input, and the operation stability of the system is improved. According to the invention, the input trajectory is redesigned by utilizing the step response in an anti-phase manner. Namely, a reversed-phase curve of a step + step response overshoot section is adopted as input,so that overshoot suppression performance is realized; furthermore, an access time point is advanced to a speed inflection point to access the reverse-phase curve, overshoot is further reduced, and meanwhile it is guaranteed that the rapid performance is not reduced too much. And the actual effect of overshoot suppression is achieved.

The invention provides a method for eliminating current overshoot and a switching circuit, belongs to the field of switching power supplies, and comprises the following steps: judging whether a systementers a power-down state or not; if the system enters the power-down state, starting a power-down protection device; and when the power-down time reaches the preset time and the preset time is greater than the period time of the bus voltage VM, enabling the integrator to stop integration. According to the method for eliminating the current overshoot provided by the invention, after the system ispowered down, the longest integration of the integrator is stopped, i.e., the upward integration is stopped. Therefore, the rise of the error signal Vcomp is limited, and the current overshoot is limited after the circuit is powered on again, so that the phenomenon of output current overshoot can be greatly reduced.