9 results about "Crossover frequency" patented technology

The invention provides an aero-engine strong non-stationary cross frequency signal time-frequency analysis method and system, and relates to the technical field of aero-engine signal processing and fault diagnosis, and the method comprises the steps: obtaining a vibration signal, and obtaining initial time-frequency distribution; performing adaptive ridge line extraction on the initial time-frequency distribution, and determining a time-frequency block range of an intersection region; carrying out local sub-blocking on the time frequency distribution in the intersection area to obtain optimized time frequency distribution; performing component reconstruction on the vibration signal by adopting Vold-Kalman order filtering to obtain final time frequency distribution; according to the method, the ridge line fracture time-frequency block is determined through bidirectional retrieval repair, the intersection area and the hierarchical cascade reconstruction component are optimized through comprehensive evaluation indexes, the ridge line continuity and instantaneous frequency extraction precision of the intersection area are remarkably improved, and high-resolution representation and accurate separation of strong non-stationary intersection frequency signals are achieved.

The invention relates to high-bandwidth constant on-time PWM control, the apparatus and related methods relate to dynamic bandwidth control of a variable-frequency modulation circuit through selective contribution of an XFTE in response to transients in the switching frequency. In an illustrative example, the XFTE can generate a transient control signal in response to a transient in a control output signal indicative of the switching frequency and received from a feedback control circuit. The XFTE can generate the transient control signal, for example, in accordance with a predetermined relationship between a crossover frequency of the modulation circuit and the switching frequency. The feedback control circuit can generate the control output signal, for example, from a predetermined reference and a control input signal. The control output signal can correspond to a pulse-width modulated output delivered through an inductor to a load, for example. An advantage of the invention is that the effective bandwidth of the modulation circuit can be advantageously increased while maintaining desired frequency response characteristics.

The invention discloses a switching power supply loop compensation parameter debugging method and device. The method comprises the following steps: acquiring an initial resistance value of a series equivalent resistor, a first initial capacitance value of a series equivalent capacitor and a second initial capacitance value corresponding to a parallel equivalent capacitor, and setting a corresponding series resistor, a series capacitor and a parallel capacitor in a switching power supply loop according to the initial resistance value, the first initial capacitance value and the second initial capacitance value; carrying out Bode test on the switching power supply loop by using a loop analyzer to obtain a phase margin, a gain margin and a ride-through frequency; and sequentially adjusting the capacitance value of the shunt capacitor, the capacitance value of the series capacitor and the resistance value of the series resistor according to the phase margin, the gain margin and the ride-through frequency until the capacitance value of the shunt capacitor, the capacitance value of the series capacitor and the resistance value of the series resistor which meet the judgment standard of the Bode test are obtained. Through the mode, the optimal loop compensation parameter can be debugged.

A magnetic field sensor architecture is disclosed that provides improved bandwidth and noise performance through the use of three distinct magnetic sensing elements: a spinning Hall- effect sensor for low-frequency and DC sensing, a non-spinning Hall-effect sensor for mid- frequency sensing, and a pickup coil for high-frequency sensing. The sensor combination includes a summing stage comprising frequency-selective filtering elements that process the outputs of the sensing elements to achieve a flat composite frequency response from DC to high frequencies. Two independently selectable crossover frequencies are used to decouple noise optimization from ripple suppression. In some embodiments, the pickup coil and non- spinning Hall-effect sensors are combined and processed through a shared path, with a simplified filter structure.

The embodiment of the invention relates to the technical field of filters, in particular to a filter, a filter filtering method and a storage medium. The filter comprises a PI loop and an auxiliary loop, an example gain coefficient, a first integral gain coefficient and a crossing frequency of the PI loop are determined when the auxiliary loop is closed, and a second integral gain coefficient of the auxiliary loop acting on the PI loop is preliminarily determined based on the crossing frequency and a target noise frequency. And the second integral gain coefficient is adjusted through the output error of the filter, that is, the parameter design of the auxiliary loop acting on the PI loop needs to be participated by the target noise frequency to be filtered, that is, the parameters of the auxiliary loop participating in the filtering are adaptively adjusted based on the target noise frequency to be filtered, and when the target noise frequency is changed, the target noise frequency is changed. In addition, the parameters of the auxiliary loop acting on the PI loop can be adaptively adjusted, so that the filter can be suitable for constant-value systems with different frequency noise interferences, and the stability of the constant-value systems is improved.

The invention discloses a boost circuit system bandwidth optimization method, which comprises the following steps: acquiring an input signal, and outputting an output signal after system signal processing; in the system signal processing process, the duty ratios of the system are detected, and the gain of a compensation loop is modulated under different duty ratios, so that the bandwidth of the system is adjusted; the step of modulating the compensation loop gain comprises the substeps that when it is detected that the duty ratio is gradually increased, the compensation loop gain is increased, so that the system ride-through frequency is improved, the system phase margin is reduced, and the system response speed is increased; and when it is detected that the duty ratio is gradually reduced, the compensation loop gain is reduced, so that the system ride-through frequency is reduced, the system phase margin is increased, and the system stability is improved. The invention further discloses the boost circuit system, and the bandwidth optimization method of the boost circuit system is adopted. The dynamic performance can be optimized while the stability of the system is ensured, and the bandwidth of the system is improved.

The invention relates to a playing calibration method of an audio playing system and a related device thereof. The playing calibration method comprises the following steps: acquiring a current frequency division point frequency of the audio playing system; a test audio signal with the current frequency division point frequency as the center frequency is generated, and the test audio signal is sent to the subwoofer and the main loudspeaker box at the same time; performing phase inversion on the audio output signal of the subwoofer to obtain a first audio output signal corresponding to the subwoofer; based on a preset delay adjustment range, performing delay processing on the first audio output signal, and acquiring a target acoustic response signal corresponding to each delay point of the test audio signal in the delay adjustment range through audio acquisition equipment; and calibrating the playing delay between the subwoofer and the main sound box through the target delay. According to the scheme provided by the invention, the delay corresponding to the lowest energy point can be determined by testing the audio signal, so that the playing delay between the subwoofer and the main loudspeaker box is accurately calibrated, the stability and the synchronism of audio playing are ensured, and the auditory experience of a user is improved.

This application discloses a PLC parameter tuning method and system based on online grid impedance identification. It dynamically locks sensitive frequency bands such as LCL resonance and crossover frequency through a key frequency adaptive selection mechanism and tracks grid resonance drift using historical data. Multi-frequency composite disturbance injection and Goertzel parallel demodulation technology are employed to efficiently extract discrete complex impedances at key frequency points. Based on this, the grid model parameters are identified using the least squares method, thereby reconstructing a continuous impedance spectrum across the entire frequency band, effectively overcoming the information loss problem caused by discrete measurements. Combining the reconstructed impedance spectrum with the inverter model, the system open-loop transfer function is constructed to accurately calculate the stability margin, and the proportional and integral gains of the PLC controller are adaptively tuned accordingly. This achieves accurate matching and robust control of complex grid characteristics under limited computing power.

This invention provides a voltage-based converter stability evaluation method, comprising the following steps: S1. Injecting single-phase voltage disturbances of different frequencies into the common coupling point of the converter; S2. Obtaining the line voltage V of the converter under the single-phase voltage disturbance. ab and V bc and the line voltage V on the grid side t,ab S3. Based on line voltage V ab and V bc Determine the positive sequence component V of the converter's response voltage. p Based on line voltage V t,ab and line voltage V bc Determine the positive sequence component V of the grid-side response voltage. t,p S4. Based on positive-order component V t,p With the positive-order component V p S5. Plot a Bode plot of the ratio Vtp / Vp; Find the point in the Bode plot where Vtp / Vp is 0, and determine the crossover frequency f. c The stability of the converter is determined based on the phase corresponding to the crossover frequency.