70 results about "Overshoot (signal)" patented technology

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 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.

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.

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.

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 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 application discloses a voltage amplitude high-frequency overshoot detection system and method, the system includes four parts: a filtering module, a superposition module, a waveform transformation module and a detection module. The method comprises: obtaining a high frequency overshoot signal, filtering out the positive value of the upper overshoot signal and the negative value of the lower overshoot signal in the high frequency overshoot signal; combining the upper overshoot voltage and the upper overshoot voltage of the filtered high frequency overshoot signal The absolute value of the lower overshoot voltage is obtained to obtain the combined high-frequency overshoot signal; the waveform of the combined high-frequency overshoot signal is transformed into a square wave with a set pulse width and a set amplitude, and the pulse width of the square wave Greater than the pulse width of the high-frequency overshoot signal; the square wave is detected. Through the present application, the accuracy of the detection result of the high-frequency overshoot signal can be effectively improved.

The invention discloses a sampling output-based space robot position and attitude active disturbance rejection control method. Firstly, a transition process is arranged for position and attitude signals desired by a system through designing a tracking differentiator to generate smooth signals, over large tracking errors to generate over large control input signals to result in severe output overshoot at an initial moment can be avoided, and the differential signals of the desired signals are obtained to prepare for the controller design. Sampling output signals of the system are used to designa continuous-discrete expansion state observer, the system state and total nonlinear uncertainties are subjected to real-time estimation, the estimated values of the nonlinear uncertainties are compensated to a feedback combination formed by state estimation values outputted by the continuous-discrete expansion state observer and smooth signals and differential signals acquired by the tracking differentiator, a compound controller is formed, nonlinear factors such as internal and external interference can be prevented from executing adverse effects on the system, and a favorable guarantee isprovided for successful completion of space operation tasks.

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.