8 results about "Passive power filter" patented technology

This invention discloses an adjustable frequency response microphone integrating XLR and USB outputs, comprising a microphone body, a dynamic microphone driver, a passive filter, a pass-through / preamp circuit, an XLR XLR interface, a USB module, and a function control circuit. The passive filter employs an LC circuit structure, supporting three frequency modes: low-frequency cutoff, mid-frequency boost, and flat response, effectively filtering out ambient noise and enhancing vocal quality. The pass-through / preamp circuit offers both pass-through and preamp modes, with adjustable preamp gain to accommodate dynamic microphone drivers of varying sensitivities, and can be externally or internally powered by phantom power. The USB module integrates a Type-C interface and an audio chip, supporting analog-to-digital / digital-to-analog conversion, real-time headphone monitoring, and external power supply. The function control circuit integrates an encoder and a touch panel, enabling adjustments such as volume, mixing, and mute, and enhances the interactive experience with an RGB lighting module. This invention combines the advantages of professional XLR output with convenient USB output, making it suitable for professional recording, live streaming, gaming, and other scenarios.

The application discloses a control method and system of a hybrid active power filter and a storage medium, wherein the inductance value and the capacitance value of a passive power filter are taken as inputs of a particle swarm optimization method to obtain optimized inductance value and capacitance value; when the harmonic number filtered by the passive power filter is the same as the harmonic number filtered by the active power filter, the active power filter is equivalent to a virtual LC filter with the same structure as the passive power filter; otherwise, the active power filter is equivalent to a virtual resistor; a harmonic compensation current reference value of the active power filter is obtained; the harmonic compensation current reference value and a reactive compensation current reference value are superimposed to obtain a total reference current of the active power filter, and the total reference current is taken as an input of a proportional resonant controller, and the output of the proportional resonant controller is PWM modulated. The application eliminates the harmonic current amplification problem of the passive power filter and improves the stability and compensation performance of the power system.

The application discloses a high-frequency oscillation suppression method and device of an MMC-HVDC system, and belongs to the technical field of flexible direct current power transmission system stability control; in view of the problem that the non-minimum phase characteristic of the MMC is caused by the control link delay, and further causes high-frequency oscillation of 1000-2500 Hz, a high-frequency impedance model of the system containing the delay is constructed, and the oscillation mechanism dominated by the non-minimum phase characteristic is determined; a third-order high-pass filter is connected in parallel with the PCC point of the MMC and the alternating current power grid, filter parameters are optimized, -90° phase compensation is realized in a negative damping interval, and the fundamental active power loss is reduced; the impedance characteristic is researched through an impedance detection method, high-frequency oscillation risk is judged, and remodeling effect is verified to suppress the oscillation; the application fundamentally eliminates the negative damping characteristic of the system, the suppression effect is better than that of a traditional passive filter, the influence on the steady-state and transient-state characteristics of the system is small, the application is suitable for different power grid working conditions, and the engineering practicability is high.

This invention relates to harmonic source tracing in converter stations, specifically to a multi-harmonic source tracing method for converter stations based on filter adaptive switching disturbances. When a passive filter state switch is detected, multiple sets of harmonic voltage phasors and harmonic current phasors are continuously collected in the steady-state intervals before and after the switch. The phasor sequences collected before and after the switch are cross-paired to construct a full-combination sample data. The background harmonic voltage variation coefficient is calculated, and background harmonic voltage stability is verified using a verification threshold. For the full-combination sample data that passes the background harmonic voltage stability verification, a harmonic responsibility quantification index is calculated. For the harmonic responsibility quantification index obtained from multiple passive filter state switches, a weighting factor based on the background harmonic voltage variation coefficient is introduced, and harmonic source tracing is performed by calculating the comprehensive harmonic responsibility quantification index. This invention effectively overcomes the shortcomings of achieving accurate quantitative harmonic source tracing in converter stations under multi-source coupling and dynamic time-varying scenarios.

Embodiments of the present disclosure provide a method for signal processing, a circuit for signal processing, a chip for signal processing, and an electronic device. The method for signal processing includes: outputting a positive output signal and a negative output signal based on the PWM positive signal and the PWM negative signal; wherein, in response to an absolute value of an amplitude of the input signal being larger than 0 and smaller than a first threshold, each of the positive output signal and the negative output signal includes 2 pulses within one pulse period, and pulse widths of the pulses included in the positive output signal are different from pulse widths of the pulses included in the negative output signal. This solution can reduce the frequency requirements for a passive filter that processes positive and negative output signals, thereby reducing the costs of the system for signal processing.

The application relates to a hybrid power filtering method, belonging to the filtering field. The existing scheme combining a passive filter and an active filter is prone to causing damage to the passive filter and the active filter. Load current and grid-side current in a power system are collected simultaneously to extract harmonic components; each harmonic current is obtained, compensation current and total harmonic current distortion rate are obtained according to the each harmonic current; the temperature or voltage of the active filter is detected in real time; when the temperature of the active filter is less than or equal to a preset temperature threshold or the voltage is less than or equal to a preset voltage threshold, the active filter is controlled to be connected to the power system; when the temperature of the active filter is greater than the preset temperature threshold or the voltage is greater than the preset voltage threshold, the total harmonic current distortion rate is compared with each harmonic set threshold, and the passive filter branch corresponding to the harmonic with the total harmonic current distortion rate greater than the set threshold is controlled to be connected to the power system. The application is used for hybrid filtering.

Several aspects of this application relate to a parallel hybrid acoustic passive filter. The parallel hybrid acoustic passive filter includes a first sub-filter and a second sub-filter. The first sub-filter includes a first acoustic resonator and a first non-acoustic passive component. The second sub-filter includes a second acoustic resonator and a second non-acoustic passive component. The first and second sub-filters are arranged together to filter radio frequency signals. For example, the parallel hybrid acoustic filter can be a bandpass filter or a bandstop filter. Related multiplexers, wireless communication devices, and methods are also disclosed.